【０００１】[0001]
【発明の属する技術分野】本発明は、発光素子を光源と
するＬＣＤバックライトにおいて、発光素子個々の波長
の輝度を調整し輝度ばらつきを軽減するＬＣＤ照明装置
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LCD backlight device which uses a light emitting element as a light source, and adjusts the luminance at each wavelength of the light emitting element to reduce the luminance variation.
【０００２】[0002]
【従来の技術】近年、ＬＣＤを照射するバックライトの
発光素子は発光ダイオード（以下ＬＥＤと略記：Light
Emitting Diode）が使用されることが多く、複数の波長
の異なるＬＥＤを個別に発光させ混合する多色発光のバ
ックライトも普及してきた。2. Description of the Related Art In recent years, a light emitting element of a backlight for irradiating an LCD is a light emitting diode (hereinafter abbreviated as LED).
Emitting Diodes) are often used, and multicolor light-emitting backlights in which LEDs having different wavelengths are individually emitted and mixed have become widespread.
【０００３】従来ＬＣＤを照射するバックライトの発光
素子を発光させる構成として、図１０のようなものが知
られている。直流電源101に電圧を印加し固定抵抗1002
により電流制限してＬＣＤ表示手段106内にある発光素
子105へ電流を流すことで発光素子105は発光してＬＣＤ
104を照射するが、固定抵抗1002の抵抗値を下げて電流
を増やせば発光輝度は高くなり、抵抗値を上げて電流を
減らせば発光輝度は低くなる。FIG. 10 shows a known structure for emitting light from a light emitting element of a backlight for irradiating an LCD. Apply voltage to DC power supply 101 and apply fixed resistance 1002
The current is limited by the current, and the current is supplied to the light emitting element 105 in the LCD display means 106, so that the light emitting element 105 emits light and the LCD
Irradiation is performed on 104, and the emission luminance increases when the resistance value of the fixed resistor 1002 is decreased and the current is increased, and the emission luminance is decreased when the resistance value is increased and the current is decreased.
【０００４】また、多色発光のバックライトでは、各々
異なる色の単色発光素子を複数有して同時発光させた
り、１素子で２つ以上の色を個別に発光できる発光素子
を用いて各々異なる色を同時発光させたりして混合色を
発光できるようにしており、これらはいずれも図１０の
構成を各１色ごと複数構成することで発光できる。[0004] Further, a multi-color light emitting backlight has a plurality of single-color light-emitting elements of different colors to emit light at the same time, or uses a light-emitting element which can emit two or more colors individually with one element, and thus differs from each other. A mixed color can be emitted by simultaneously emitting the colors, and all of them can emit light by configuring a plurality of the configurations of FIG. 10 for each color.
【０００５】特に混合色の発光では発光素子個々の輝度
ばらつきにより色むらが出る場合もあり、また単色にお
いても安定した輝度を得るようにするためには、いずれ
も固定抵抗1002の抵抗値を変えて電流を調整し各々の輝
度を調整することが必要である。In particular, in the case of mixed-color light emission, color unevenness may occur due to variations in the luminance of each light-emitting element. In order to obtain stable luminance even in a single color, the resistance of the fixed resistor 1002 must be changed in any case. It is necessary to adjust the current and the brightness of each.
【０００６】上記の手段によれば、ＬＣＤ表示手段106
においてＬＣＤ104のバックライトとなる発光素子105の
輝度ばらつきを軽減するべく輝度を調整する場合は、電
流調整するために固定抵抗1002をその都度付け替える必
要があった。According to the above means, the LCD display means 106
In the case where the brightness is adjusted to reduce the brightness variation of the light emitting element 105 serving as the backlight of the LCD 104, the fixed resistor 1002 has to be replaced each time in order to adjust the current.
【０００７】[0007]
【発明が解決しようとする課題】近年では、発光素子の
中でも特にＬＥＤを発光源としたバックライトが普及し
ており、単色発光から年々多機能化の流れで複数の単色
発光素子の照射光を混合させた多色発光のバックライト
へと進展してきている。In recent years, among the light-emitting elements, backlights using LEDs as light-emitting sources have become widespread, and the irradiation of a plurality of single-color light-emitting elements has been promoted from monochromatic light emission to multifunctional functions year after year. It is developing into a mixed-colored backlight.
【０００８】ところで、実際の発光素子は生産ロット等
により個々に輝度ばらつきが存在している。すると、同
一波長の単色発光素子を複数点灯させた時にバックライ
ト上に部分的な輝度むらが発生したり、また各々違う波
長どうしの単色発光素子を複数有して同時発光させ混合
色を照射する時にバックライト上に輝度むらや色むらが
発生したりする。そのため図１０の従来のＬＣＤ照明装
置の構成では、輝度ばらつきを軽減すべく電流調整する
ための固定抵抗値1002を決めるために、基板実装前にあ
らかじめ発光素子の実際の発光輝度データが必要だった
り、他の治具で事前に輝度測定を行ない発光素子の各々
の輝度値を知る必要があった。Incidentally, actual light emitting elements have individual luminance variations depending on production lots and the like. Then, when a plurality of single-color light-emitting elements of the same wavelength are turned on, partial brightness unevenness occurs on the backlight, or a plurality of single-color light-emitting elements of different wavelengths are provided to simultaneously emit light to emit a mixed color. Occasionally, uneven brightness or color occurs on the backlight. Therefore, in the configuration of the conventional LCD lighting device of FIG. 10, in order to determine the fixed resistance value 1002 for adjusting the current in order to reduce the luminance variation, actual light emission luminance data of the light emitting element is required before mounting on the substrate. In addition, it is necessary to measure the luminance of each light emitting element in advance by measuring the luminance with another jig.
【０００９】また、発光輝度のばらつきを抑えるよう輝
度選別やランク分けを行なうと供給量減少や選別工数分
が増えるという理由でＬＣＤ表示手段として生産数の制
限やコストアップの要因となる。Further, if the brightness selection or rank classification is performed so as to suppress the variation of the light emission brightness, the supply amount is reduced and the number of sorting steps is increased, thereby limiting the number of LCD display units and increasing the cost.
【００１０】さらに、輝度のばらつき具合は予想が難し
いため、生産上においてどの固定抵抗値をどれだけ手配
すれば良いのか見通しが立てにくい問題もある。[0010] Furthermore, since it is difficult to predict the degree of variation in luminance, there is a problem that it is difficult to determine which fixed resistance value and how much should be arranged in production.
【００１１】本発明は上記のような問題を解決するもの
で、基板上に実装された発光素子個々の輝度を電流によ
って調整し、簡単な構成でＬＣＤのバックライトの輝度
ばらつきや色むらを軽減しうるＬＣＤ照明装置を提供す
ることを目的とする。The present invention solves the above-mentioned problems, and adjusts the brightness of each light-emitting element mounted on a substrate by a current to reduce the brightness variation and color unevenness of the LCD backlight with a simple configuration. It is an object of the present invention to provide an LCD lighting device that can perform the same.
【００１２】[0012]
【課題を解決するための手段】この課題を解決するため
に、本発明は輝度を電流により調整する輝度調整手段と
発光素子の輝度を測定する輝度測定手段と測定輝度に応
じて発光輝度を設定する輝度設定手段とを備えることに
より、ＬＣＤ表示手段における発光素子の輝度ばらつき
を吸収し、ＬＣＤのバックライトとして輝度ばらつきや
混合色での色むらを軽減させるものである。In order to solve this problem, the present invention provides a luminance adjusting means for adjusting luminance by a current, a luminance measuring means for measuring luminance of a light emitting element, and a method for setting a light emitting luminance according to the measured luminance. With this configuration, the brightness variation of the light emitting elements in the LCD display means is absorbed, and the brightness variation and the color unevenness in the mixed colors are reduced as the backlight of the LCD.
【００１３】[0013]
【発明の実施の形態】本発明の請求項１に記載の発明
は、文字や記号を表示するＬＣＤを有し少なくとも１つ
以上の波長の照射光を出力する発光素子を備えたＬＣＤ
表示手段と、前記ＬＣＤ表示手段の外部に前記発光素子
の輝度を測定する輝度測定手段と前記輝度測定手段の測
定結果に応じて前記発光素子の輝度を設定する輝度設定
手段と前記輝度設定手段からの設定を受け前記発光素子
の輝度を調整する輝度調整手段とを備えたＬＣＤ照明装
置であり、前記発光素子の輝度を所定の輝度に調整する
ことができるという作用を有する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is an LCD having an LCD for displaying characters and symbols and having a light emitting element for outputting irradiation light of at least one or more wavelengths.
Display means, a luminance measuring means for measuring the luminance of the light emitting element outside the LCD display means, a luminance setting means for setting the luminance of the light emitting element according to the measurement result of the luminance measuring means, and the luminance setting means. And a brightness adjusting means for adjusting the brightness of the light emitting element in response to the setting described above, which has an effect that the brightness of the light emitting element can be adjusted to a predetermined brightness.
【００１４】本発明の請求項２に記載の発明は、前記Ｌ
ＣＤ表示手段は１つの波長の照射光を出力し前記ＬＣＤ
を照らすことができるという作用を有する。The invention according to claim 2 of the present invention is characterized in that the L
CD display means outputs irradiation light of one wavelength and outputs the light
Has the effect of being able to illuminate.
【００１５】本発明の請求項３に記載の発明は、前記輝
度調整手段は前記発光素子に直流電源を印加し電流の増
減で輝度を調整するＬＣＤ照明装置であり、前記発光素
子の輝度を電流で調整し前記ＬＣＤ表示手段の輝度ばら
つきを軽減することができるという作用を有する。According to a third aspect of the present invention, the brightness adjusting means is an LCD lighting device for adjusting the brightness by applying a DC power to the light emitting element and increasing / decreasing the current. To reduce the variation in brightness of the LCD display means.
【００１６】本発明の請求項４に記載の発明は、前記輝
度設定手段はレーザー光を照射するレーザー光照射手段
を備え、前記輝度調整手段は前記レーザー光を照射する
ことで抵抗値を調整できる可変抵抗を備えたＬＣＤ照明
装置であり、可変抵抗の抵抗値を可変させ発光素子に流
れる電流を調整することができるという作用を有する。According to a fourth aspect of the present invention, the brightness setting means includes a laser light irradiating means for irradiating a laser beam, and the brightness adjusting means can adjust a resistance value by irradiating the laser beam. This is an LCD lighting device provided with a variable resistor, and has an effect that the resistance value of the variable resistor can be varied to adjust the current flowing through the light emitting element.
【００１７】本発明の請求項５に記載の発明は、前記輝
度設定手段は前記輝度測定手段の測定結果を輝度設定値
に変換する変換手段を備え、前記輝度調整手段は前記輝
度設定値を記憶する記憶手段と前記輝度設定値に応じた
制御電圧を出力する制御手段と前記制御手段から出力さ
れた制御電圧に応じて電流を流す電圧−電流変換手段と
を備えたＬＣＤ照明装置であり、輝度設定値により発光
素子に流れる電流を調整することができるという作用を
有する。According to a fifth aspect of the present invention, the brightness setting means includes a converting means for converting a measurement result of the brightness measuring means into a brightness setting value, and the brightness adjusting means stores the brightness setting value. An LCD illuminating device comprising: a storage unit for performing the control, a control unit for outputting a control voltage corresponding to the luminance setting value, and a voltage-current conversion unit for supplying a current according to the control voltage output from the control unit. This has the effect that the current flowing through the light emitting element can be adjusted by the set value.
【００１８】本発明の請求項６に記載の発明は、前記輝
度調整手段は前記発光素子にパルス電源を印加しパルス
のデューティ(ｄｕｔｙ)比を変化させ流れる電流の平均
値の増減で輝度を調整するＬＣＤ照明装置であり、前記
発光素子の輝度を電流で調整し前記ＬＣＤ表示手段の輝
度ばらつきを軽減することができるという作用を有す
る。According to a sixth aspect of the present invention, the brightness adjusting means adjusts the brightness by applying a pulse power to the light emitting element and changing the duty ratio of the pulse to increase or decrease the average value of the flowing current. LCD lighting device having the function of adjusting the brightness of the light-emitting element with a current and reducing the brightness variation of the LCD display means.
【００１９】本発明の請求項７に記載の発明は、前記輝
度設定手段は前記輝度測定手段の測定結果を輝度設定値
に変換する変換手段を備え、前記輝度調整手段は前記輝
度設定値を記憶する記憶手段と前記輝度設定値に応じた
デューティ(ｄｕｔｙ)比でパルス信号を出力するパルス
制御手段と前記パルス信号により前記発光素子に供給す
る電源をオンオフするスイッチング手段とを備えたＬＣ
Ｄ照明装置であり、輝度設定値により発光素子に流れる
電流の平均値を調整することができるという作用を有す
る。According to a seventh aspect of the present invention, the luminance setting means includes a conversion means for converting a measurement result of the luminance measuring means into a luminance setting value, and the luminance adjusting means stores the luminance setting value. An LC comprising: a storage unit for performing the operation; a pulse control unit that outputs a pulse signal at a duty ratio according to the luminance setting value; and a switching unit that turns on and off a power supply to the light emitting element based on the pulse signal.
This is a D lighting device, and has an effect that an average value of a current flowing through a light emitting element can be adjusted by a luminance setting value.
【００２０】本発明の請求項８に記載の発明は、前記Ｌ
ＣＤ表示手段は２つ以上の波長の照射光を出力し前記Ｌ
ＣＤを照らす作用を有する。The invention according to claim 8 of the present invention is characterized in that the L
The CD display means outputs irradiation light of two or more wavelengths,
It has the effect of illuminating a CD.
【００２１】本発明の請求項９に記載の発明は、前記輝
度調整手段は前記発光素子に直流電源を印加し前記発光
素子の照射する各一波長ごとに電流の増減で輝度を調整
するＬＣＤ照明装置であり、前記発光素子の各波長の輝
度を電流で調整し前記ＬＣＤ表示手段における単色光の
輝度ばらつきや混合色の輝度ばらつき及び色むらを軽減
することができるという作用を有する。According to a ninth aspect of the present invention, in the LCD lighting device, the luminance adjusting means applies a DC power to the light emitting element and adjusts the luminance by increasing or decreasing the current for each wavelength irradiated by the light emitting element. This is an apparatus, and has an operation of adjusting the luminance of each wavelength of the light emitting element with a current to reduce the luminance variation of monochromatic light, the luminance variation of mixed colors, and the color unevenness in the LCD display means.
【００２２】本発明の請求項１０に記載の発明は、前記
輝度設定手段はレーザー光を照射するレーザー光照射手
段を備え、前記輝度調整手段は前記レーザー光を照射す
ることで抵抗値を調整できる可変抵抗を備えたＬＣＤ照
明装置であり、前記発光素子の照射する各一波長ごとに
可変抵抗の抵抗値を可変させ発光素子に流れる電流を調
整することができるという作用を有する。According to a tenth aspect of the present invention, the luminance setting means includes a laser light irradiating means for irradiating a laser light, and the luminance adjusting means can adjust a resistance value by irradiating the laser light. An LCD lighting device having a variable resistor, which has an effect that the resistance value of the variable resistor can be varied for each wavelength irradiated by the light emitting element to adjust a current flowing through the light emitting element.
【００２３】本発明の請求項１１に記載の発明は、前記
輝度設定手段は前記輝度測定手段の測定結果を輝度設定
値に変換する変換手段を備え、前記輝度調整手段は前記
輝度設定値を記憶する記憶手段と前記輝度設定値に応じ
た制御電圧を出力する制御手段と前記制御手段から出力
された制御電圧に応じて電流を流す電圧−電流変換手段
とを備えたＬＣＤ照明装置であり、前記発光素子の照射
する各一波長ごとの輝度設定値により発光素子に流れる
電流を調整することができるという作用を有する。According to an eleventh aspect of the present invention, the luminance setting means includes a conversion means for converting a measurement result of the luminance measuring means into a luminance setting value, and the luminance adjusting means stores the luminance setting value. An LCD lighting device comprising: a storage unit that performs a control voltage that outputs a control voltage corresponding to the luminance setting value; and a voltage-current conversion unit that supplies a current according to the control voltage output from the control unit. This has the effect that the current flowing through the light emitting element can be adjusted by the luminance set value for each wavelength emitted by the light emitting element.
【００２４】本発明の請求項１２に記載の発明は、前記
輝度調整手段は前記発光素子にパルス電源を印加し前記
発光素子の照射する各一波長ごとにパルスのデューティ
(ｄｕｔｙ)比を変化させ流れる電流の平均値の増減で輝
度を調整するＬＣＤ照明装置であり、前記発光素子の各
波長の輝度を電流で調整し前記ＬＣＤ表示手段における
単色光の輝度ばらつきや混合色の輝度ばらつき及び色む
らを軽減することができるという作用を有する。According to a twelfth aspect of the present invention, the luminance adjusting means applies a pulse power to the light emitting element and applies a pulse duty for each wavelength irradiated by the light emitting element.
(Duty) An LCD illuminating device that adjusts luminance by changing the ratio and changing the average value of flowing current. The luminance of each wavelength of the light-emitting element is adjusted by current to adjust the luminance variation and mixing of monochromatic light in the LCD display means. This has the effect of reducing color luminance variation and color unevenness.
【００２５】本発明の請求項１３に記載の発明は、前記
輝度設定手段は前記輝度測定手段の測定結果を輝度設定
値に変換する変換手段を備え、前記輝度調整手段は前記
輝度設定値を記憶する記憶手段と前記輝度設定値に応じ
たデューティ(ｄｕｔｙ)比でパルス信号を出力するパル
ス制御手段と前記パルス信号により前記発光素子に供給
する電源をオンオフするスイッチング手段とを備えたＬ
ＣＤ照明装置であり、前記発光素子の照射する各一波長
ごとの輝度設定値により発光素子に流れる電流の平均値
を調整することができるという作用を有する。According to a thirteenth aspect of the present invention, the luminance setting means includes a conversion means for converting a measurement result of the luminance measuring means into a luminance setting value, and the luminance adjusting means stores the luminance setting value. And a switching means for turning on and off a power supply to the light-emitting element by the pulse signal, the pulse control means outputting a pulse signal at a duty ratio according to the luminance setting value.
This is a CD illuminating device, and has an effect that an average value of a current flowing through a light emitting element can be adjusted by a luminance setting value for each one wavelength irradiated by the light emitting element.
【００２６】以下、本発明の実施の形態について、図１
から図９を用いて説明する。Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG.
【００２７】（第１の実施の形態）図１は、本発明の第
１の実施形態におけるＬＣＤ照明装置の構成を示すブロ
ック図である。図１において第１の実施形態におけるＬ
ＣＤ照明装置は、発光素子に電流を供給する直流電源10
1と、レーザー光の照射により抵抗値を可変できる可変
抵抗102と、発光素子105の輝度を電流増減により調整す
る輝度調整手段103と、ＬＣＤ（Liquid Crystal Displa
y）104と、発光素子105と、ＬＣＤ104と発光素子105を
備えたＬＣＤ表示手段106と、発光素子105の輝度を測定
する輝度測定手段107と、レーザー光を照射するレーザ
ー光照射手段108と、輝度測定手段107の測定結果に応じ
抵抗値の設定を行なう輝度設定手段109とから構成され
ている。(First Embodiment) FIG. 1 is a block diagram showing a configuration of an LCD lighting device according to a first embodiment of the present invention. In FIG. 1, L in the first embodiment
The CD illuminator has a DC power supply 10 for supplying current to the light emitting element.
1, a variable resistor 102 whose resistance value can be varied by irradiation with laser light, a brightness adjusting means 103 for adjusting the brightness of the light emitting element 105 by increasing or decreasing the current, and an LCD (Liquid Crystal Displa).
y) 104, a light emitting element 105, an LCD 104, an LCD display means 106 including the light emitting element 105, a luminance measuring means 107 for measuring the luminance of the light emitting element 105, a laser light irradiating means 108 for irradiating laser light, And a luminance setting means 109 for setting a resistance value according to the measurement result of the luminance measuring means 107.
【００２８】図１のＬＣＤ照明装置は、ＬＣＤを照らす
単色の発光素子１つを発光させ、かつ発光素子の輝度を
調整するための構成例を示している。初めに直流電源10
1を投入すると輝度調整手段103は初期状態で電流を流
し、ＬＣＤ表示手段106内にある発光素子105が点灯しＬ
ＣＤ104を照射する。ここで輝度調整手段103は可変抵抗
102を具備しており、外部からレーザー光を抵抗表面に
照射して抵抗体を焼き切ることにより抵抗値を変化さ
せ、以後半永久的にその抵抗値を維持できる特徴を持っ
ている。The LCD illuminating device shown in FIG. 1 shows an example of a configuration for causing one single color light emitting element illuminating the LCD to emit light and adjusting the luminance of the light emitting element. First DC power supply 10
When 1 is turned on, the brightness adjusting means 103 allows current to flow in the initial state, and the light emitting element 105 in the LCD
Irradiate CD104. Here, the brightness adjusting means 103 is a variable resistor.
It has a characteristic that the resistance value can be changed by irradiating the resistance surface with a laser beam from the outside to burn off the resistance body, and thereafter to maintain the resistance value semipermanently.
【００２９】可変抵抗102は、レーザー光を照射する前
は一定の初期抵抗値を持っており、輝度調整手段103の
初期状態とはこの状態を指す。よって、設計上では発光
素子105の輝度仕様と前記可変抵抗102の初期抵抗値から
算出する電流値を基に目的の発光輝度を得るようにして
いる。The variable resistor 102 has a constant initial resistance value before irradiating the laser beam, and the initial state of the brightness adjusting means 103 indicates this state. Therefore, in design, a desired light emission luminance is obtained based on the luminance specification of the light emitting element 105 and the current value calculated from the initial resistance value of the variable resistor 102.
【００３０】しかし、発光素子105には個々に輝度ばら
つきがあり、この輝度の違いを電流で調整して輝度ばら
つきをなくす必要がある。輝度調整手段103が初期状態
の時に発光素子105が発光した状態で、輝度測定手段107
が前記発光素子105の輝度を測定する。However, each of the light emitting elements 105 has a luminance variation, and it is necessary to eliminate the luminance variation by adjusting the difference in luminance with a current. In a state where the light emitting element 105 emits light when the luminance adjusting means 103 is in the initial state, the luminance measuring means 107
Measures the luminance of the light emitting element 105.
【００３１】輝度測定手段107は、ＣＣＤを応用した輝
度分析機能を内蔵しているが、必ずしもこの機能に限定
されたものではない。上記による輝度測定結果は輝度設
定手段109に伝達するが、伝達方法は電圧でも電流で
も、またシリアル信号でもパラレル信号でもよくこれら
に限ったものではない。The brightness measuring means 107 has a built-in brightness analysis function using a CCD, but is not necessarily limited to this function. The result of the luminance measurement described above is transmitted to the luminance setting means 109, but the transmission method may be voltage, current, serial signal or parallel signal, and is not limited thereto.
【００３２】輝度設定手段109は、前記輝度測定結果が
設計値より高い場合にその大きさに応じて電流を減らす
ように最適な抵抗値を選択する。なお輝度設定手段109
にはあらかじめ輝度値と設定する抵抗値の関係を記憶さ
せておく。輝度設定手段109はレーザー光照射手段108を
有し可変抵抗102にレーザー光を所定の距離で照射し抵
抗値を変化させる機能を持っており、上記で選択した抵
抗値になるように可変抵抗へレーザー光を照射し抵抗値
を変化させる。以後、可変後の抵抗値に応じた電流が直
流電源101から発光素子105に流れるようになり、目的の
発光輝度に調整された状態を維持することができる。When the luminance measurement result is higher than the design value, the luminance setting means 109 selects an optimum resistance value so as to reduce the current according to the magnitude. Note that the brightness setting means 109
Stores the relationship between the luminance value and the resistance value to be set in advance. The brightness setting means 109 has a function of irradiating the variable resistor 102 with laser light at a predetermined distance to change the resistance value, and has a function of changing the resistance value to the variable resistance 102 so that the resistance value becomes the resistance value selected above. The resistance value is changed by irradiating a laser beam. Thereafter, a current corresponding to the variable resistance value flows from the DC power supply 101 to the light emitting element 105, and the state adjusted to the target light emission luminance can be maintained.
【００３３】（第２の実施の形態）図２は、本発明の第
２の実施形態におけるＬＣＤ照明装置の構成を示すブロ
ック図である。図２において第２の実施形態におけるＬ
ＣＤ照明装置は、発光素子に電流を供給する直流電源10
1と、制御電圧に応じて電流を流す電圧−電流変換手段2
02と、輝度調整手段203と、ＬＣＤ（Liquid Crystal Di
splay）104と、発光素子105と、ＬＣＤ104と発光素子10
5を備えたＬＣＤ表示手段106と、発光素子105の輝度を
測定する輝度測定手段107と、輝度測定手段107の輝度測
定結果に応じ輝度設定値に変換出力する変換手段208
と、変換手段208を有し輝度の補正値を設定する輝度設
定手段209と、輝度設定値に応じ電圧−電流変換手段202
に制御電圧を出力する制御手段210と、輝度設定手段209
からの輝度設定値を記憶している記憶手段211とから構
成されている。また、図３は変換手段208における輝度
と設定値の関係を示す特性図である。また、図４は電圧
−電流変換手段202における制御電圧と電流出力の関係
を示す特性図である。(Second Embodiment) FIG. 2 is a block diagram showing a configuration of an LCD lighting device according to a second embodiment of the present invention. In FIG. 2, L in the second embodiment
The CD illuminator has a DC power supply 10 for supplying current to the light emitting element.
1 and voltage-current conversion means 2 for flowing a current according to the control voltage 2
02, brightness adjustment means 203, and LCD (Liquid Crystal Diode).
splay) 104, light emitting element 105, LCD 104 and light emitting element 10
5, a luminance measuring means 107 for measuring the luminance of the light emitting element 105, and a converting means 208 for converting and outputting a luminance set value according to the luminance measurement result of the luminance measuring means 107.
A luminance setting means 209 having a conversion means 208 for setting a luminance correction value; and a voltage-current conversion means 202 according to the luminance setting value.
Control means 210 for outputting a control voltage to the
And a storage means 211 for storing the luminance set value from the storage device. FIG. 3 is a characteristic diagram showing the relationship between the luminance and the set value in the conversion means 208. FIG. 4 is a characteristic diagram showing the relationship between the control voltage and the current output in the voltage-current conversion means 202.
【００３４】図２のＬＣＤ照明装置は、ＬＣＤを照らす
単色の発光素子１つを発光させ、かつ発光素子の輝度を
調整するための構成例を示している。初めに直流電源10
1を投入すると輝度調整手段203は初期状態で発光素子10
5に電流を流し、ＬＣＤ表示手段106内にある発光素子10
5が点灯しＬＣＤ104を照射する。The LCD illuminating device shown in FIG. 2 shows an example of a configuration for causing one single color light emitting element illuminating the LCD to emit light and adjusting the luminance of the light emitting element. First DC power supply 10
When 1 is turned on, the brightness adjusting means 203 is initially set in the light emitting element 10
5, a current is applied to the light emitting element 10 in the LCD display means 106.
5 lights up and illuminates the LCD 104.
【００３５】輝度調整手段203は、制御手段210と記憶手
段211と電圧−電流変換手段202で構成される。制御手段
210は記憶手段211に格納されている初期の輝度設定値を
読み出しそれに応じた制御電圧を電圧−電流変換手段20
2に出力するが、制御手段210は前記輝度設定値の値が大
きい程出力する制御電圧が高くなる特性を持つ。The brightness adjusting means 203 comprises a control means 210, a storage means 211 and a voltage-current conversion means 202. Control means
Reference numeral 210 reads the initial luminance set value stored in the storage unit 211 and outputs a control voltage corresponding to the read initial luminance set value to the voltage-current conversion unit 20.
The control means 210 has a characteristic that the output control voltage increases as the value of the luminance set value increases.
【００３６】上記により、初期状態での輝度調整手段20
3とは、電圧−電流変換手段202が前記初期の輝度設定値
に応じた前記制御電圧を受けそれに応じた電流を発光素
子105に流すことをいい、輝度調整前のデフォルトとな
る。なお、電圧−電流変換手段202は電子的に電流を制
御する方法でも負荷を制御する方法でも良くこれらに限
ったものではないが、上記の場合の制御電圧と電流出力
の関係は図４に示す特性を持つ。As described above, the brightness adjusting means 20 in the initial state
3 means that the voltage-current conversion means 202 receives the control voltage according to the initial luminance setting value and supplies a current corresponding to the control voltage to the light emitting element 105, which is a default before luminance adjustment. The voltage-current conversion means 202 may be a method of controlling current electronically or a method of controlling load, and is not limited thereto. The relationship between control voltage and current output in the above case is shown in FIG. Has characteristics.
【００３７】よって、設計上では発光素子105の輝度仕
様と記憶手段211に記憶されている初期の輝度設定値に
応じた電流値を基に算出し目的の発光輝度を得るように
している。Therefore, in design, the target light emission luminance is obtained by calculating based on the luminance specification of the light emitting element 105 and the current value according to the initial luminance set value stored in the storage means 211.
【００３８】しかし、発光素子105には個々に輝度ばら
つきがあり、この輝度の違いを電流で調整して輝度ばら
つきをなくす必要がある。輝度調整手段203が初期状態
の時に発光素子105が発光した状態で、輝度測定手段107
が発光素子105の輝度を測定して輝度測定結果を輝度設
定手段209に伝達する。However, the light emitting elements 105 have individual luminance variations, and it is necessary to adjust the difference in luminance with a current to eliminate the luminance variations. In the state where the light emitting element 105 emits light when the luminance adjusting means 203 is in the initial state, the luminance measuring means 107
Measures the luminance of the light emitting element 105 and transmits the luminance measurement result to the luminance setting means 209.
【００３９】輝度設定手段209は輝度測定結果を基に設
計値よりどれだけ差があるかを算出し、その結果を変換
手段208がデジタル値又はアナログ値の輝度設定値に変
換し制御手段210に送出する。この時、測定輝度と設定
値は図３に示すような関係を用いており、設計値よりも
測定輝度が高ければ輝度を下げるために−補正の設定
値、低ければ輝度を上げるために＋補正の設定値を出力
する。The brightness setting means 209 calculates the difference from the design value based on the brightness measurement result, and the conversion means 208 converts the result into a digital value or analog value brightness setting value. Send out. At this time, the measured luminance and the set value use the relationship as shown in FIG. 3. If the measured luminance is higher than the design value, the set value of -correction is set to lower the luminance. Outputs the set value of.
【００４０】制御手段210は、前記の＋／−補正の設定
値を受け、記憶手段211から読み出した初期の輝度設定
値に補正の設定値分を加算して＋補正では輝度設定値が
上がり−補正では輝度設定値が下がることになり、その
結果補正後の輝度設定値を記憶手段211に書き込みす
る。以後、制御手段210は輝度を補正した後の輝度設定
値を記憶手段211から読み込みそれに応じた電流を電圧
−電流変換手段202が発光素子105へ流すため、目的の発
光輝度に調整された状態を維持することができる。The control means 210 receives the above-mentioned +/- correction set value, adds the correction set value to the initial luminance set value read from the storage means 211, and increases the luminance set value by + correction. In the correction, the luminance setting value decreases, and as a result, the corrected luminance setting value is written in the storage unit 211. Thereafter, the control unit 210 reads the luminance set value after correcting the luminance from the storage unit 211, and the voltage-current conversion unit 202 passes the corresponding current to the light emitting element 105. Can be maintained.
【００４１】（第３の実施の形態）図５は、本発明の第
３の実施形態におけるＬＣＤ照明装置の構成を示すブロ
ック図である。図５において第３の実施形態におけるＬ
ＣＤ照明装置は、発光素子に電流を供給する直流電源10
1と、電源をオンオフするするスイッチング手段502と、
輝度調整手段503と、ＬＣＤ（Liquid Crystal Displa
y）104と、発光素子105と、ＬＣＤ104と発光素子105を
備えたＬＣＤ表示手段106と、発光素子105の輝度を測定
する輝度測定手段107と、輝度測定手段107の輝度測定結
果に応じ輝度設定値に変換出力する変換手段208と、変
換手段208を有し輝度の補正値を設定する輝度設定手段2
09と、輝度設定値に応じデューティ(ｄｕｔｙ)比を変化
させたパルス信号を出力するパルス制御手段510と、輝
度設定手段209からの輝度設定値を記憶している記憶手
段211とから構成されている。また、図６はパルス制御
手段510の出力パルスとスイッチング手段502の出力する
電流と発光素子105の輝度との関係を示した図である。(Third Embodiment) FIG. 5 is a block diagram showing a configuration of an LCD lighting device according to a third embodiment of the present invention. In FIG. 5, L in the third embodiment
The CD illuminator has a DC power supply 10 for supplying current to the light emitting element.
1, switching means 502 for turning on and off the power,
Brightness adjusting means 503 and an LCD (Liquid Crystal Displa)
y) 104, a light emitting element 105, an LCD 104, an LCD display means 106 including the light emitting element 105, a luminance measuring means 107 for measuring the luminance of the light emitting element 105, and a luminance setting according to a luminance measurement result of the luminance measuring means 107. A converting means 208 for converting and outputting a value, and a luminance setting means 2 having the converting means 208 for setting a luminance correction value.
09, a pulse control unit 510 that outputs a pulse signal with a changed duty ratio according to the luminance setting value, and a storage unit 211 that stores the luminance setting value from the luminance setting unit 209. I have. FIG. 6 is a diagram showing the relationship between the output pulse of the pulse control unit 510, the current output from the switching unit 502, and the luminance of the light emitting element 105.
【００４２】図５のＬＣＤ照明装置は、ＬＣＤを照らす
単色の発光素子１つを発光させ、かつ発光素子の輝度を
調整するための構成例を示している。初めに直流電源10
1を投入すると輝度調整手段503は初期状態で発光素子10
5に電流を流し、ＬＣＤ表示手段106内にある発光素子10
5が点灯しＬＣＤ104を照射する。The LCD illuminating device shown in FIG. 5 shows an example of a configuration for causing one single color light emitting element illuminating the LCD to emit light and adjusting the luminance of the light emitting element. First DC power supply 10
When 1 is input, the brightness adjustment means 503 is initially set to the light emitting element 10
5, a current is applied to the light emitting element 10 in the LCD display means 106.
5 lights up and illuminates the LCD 104.
【００４３】輝度調整手段503は、パルス制御手段510と
記憶手段211とスイッチング手段502で構成される。パル
ス制御手段510は記憶手段211に格納されている初期の輝
度設定値を読み出しそれに応じてデューティ(ｄｕｔｙ)
比を変化させたパルス信号をスイッチング手段502に出
力するが、前記輝度設定値の値が大きい程パルス信号の
ｄｕｔｙ比を大きくする特性を持つ。パルス信号の周波
数は100Hzから１kHzの任意でよいがこれに限ったもので
はない。ここでデューティ(ｄｕｔｙ)比とは、図６に示
すように、パルス１周期の時間ａ＋ｂ内での＋Ｖである
時間ａの比率をいい、(ａ/(ａ＋ｂ))×100[％]で与えら
れ、例としてデューティ(ｄｕｔｙ)比が25％、50％、75
％、100％の場合を示している。The brightness adjusting means 503 comprises a pulse control means 510, a storage means 211 and a switching means 502. The pulse control means 510 reads out the initial luminance set value stored in the storage means 211, and accordingly reads a duty (duty) value.
The pulse signal whose ratio has been changed is output to the switching means 502. The duty ratio of the pulse signal is increased as the luminance setting value increases. The frequency of the pulse signal may be any value from 100 Hz to 1 kHz, but is not limited to this. Here, as shown in FIG. 6, the duty ratio refers to the ratio of the time a that is + V within the time a + b of one pulse period, and is given by (a / (a + b)) × 100 [%]. For example, the duty ratio is 25%, 50%, 75%
% And 100% are shown.
【００４４】スイッチング手段502では、パルス制御手
段510から送られる任意のｄｕｔｙ比のパルス信号を受
け、＋Ｖの時に直流電源101と発光素子105を導通（オ
ン）させ＋Ｉの電流を流し、０の時に直流電源101と発
光素子105を開放（オフ）させ電流を流さないことで発
光素子105へ流す電流を交流的に制御する。The switching means 502 receives a pulse signal of an arbitrary duty ratio sent from the pulse control means 510, conducts (turns on) the DC power supply 101 and the light emitting element 105 when the voltage is + V, and supplies a + I current when the voltage is 0. By opening (turning off) the DC power supply 101 and the light emitting element 105 and not allowing the current to flow, the current flowing to the light emitting element 105 is controlled in an AC manner.
【００４５】つまり図６に示すように、パルス制御手段
510がｄｕｔｙ比25％のパルスを出力すると、スイッチ
ング手段502が発光素子105へ流す電流もｄｕｔｙ比25％
のパルス電流となり、50％、75％、100％のいずれの場
合も上記に習った波形になるが、ｄｕｔｙ比が大きいほ
ど平均電流が増えそれにほぼ比例し発光素子105の輝度
が高くなるので、ｄｕｔｙ比100％時を１とすると25％
では輝度が１／４になる性質がある。That is, as shown in FIG.
When the pulse 510 outputs a pulse having a duty ratio of 25%, the current flowing from the switching means 502 to the light emitting element 105 also has a duty ratio of 25%.
The pulse current is as follows, and in any of the cases of 50%, 75%, and 100%, the waveform learned as described above is obtained. However, the average current increases as the duty ratio increases, and the luminance of the light-emitting element 105 increases in proportion to the average current. 25% when the duty ratio is 100% and 1
Has the property of reducing the luminance to 1/4.
【００４６】上記から、初期状態での輝度調整手段503
とは、スイッチング手段502が前記初期の輝度設定値に
応じた前記ｄｕｔｙ比のパルス信号を受け、発光素子10
5へ流す電流をオンオフ制御することで交流的な平均電
流を発光素子105に流すことをいい、輝度調整前のデフ
ォルトとなる。From the above, the brightness adjusting means 503 in the initial state
Means that the switching unit 502 receives the pulse signal of the duty ratio according to the initial luminance setting value, and
The on / off control of the current flowing to 5 means that an alternating average current flows to the light emitting element 105, which is the default before brightness adjustment.
【００４７】よって、設計上では発光素子105の輝度仕
様と記憶手段211に記憶された初期の輝度設定値に応じ
たパルスのｄｕｔｙ比から変換する平均電流値とを基に
目的の発光輝度を得るようにしている。Therefore, in design, a desired light emission luminance is obtained based on the luminance specification of the light emitting element 105 and the average current value converted from the duty ratio of the pulse corresponding to the initial luminance set value stored in the storage means 211. Like that.
【００４８】しかし、発光素子105には個々に輝度ばら
つきがあり、この輝度の違いを電流で調整して輝度ばら
つきをなくす必要がある。輝度調整手段503が初期状態
の時に発光素子105が発光した状態で、輝度測定手段107
が発光素子105の輝度を測定して輝度測定結果を輝度設
定手段209に伝達する。However, each of the light emitting elements 105 has a luminance variation, and it is necessary to eliminate the luminance variation by adjusting the difference in the luminance with a current. When the luminance adjusting unit 503 is in the initial state and the light emitting element 105 emits light, the luminance measuring unit 107
Measures the luminance of the light emitting element 105 and transmits the luminance measurement result to the luminance setting means 209.
【００４９】輝度設定手段209は輝度測定結果を基に設
計値よりどれだけ差があるかを算出し、その結果を変換
手段208がデジタル値又はアナログ値の輝度設定値に変
換しパルス制御手段510に送出する。この時、測定輝度
と設定値は図３に示すような関係を用いており、設計値
よりも測定輝度が高ければ輝度を下げるために−補正の
設定値、低ければ輝度を上げるために＋補正の設定値を
出力する。The luminance setting means 209 calculates the difference from the design value based on the luminance measurement result, and the conversion means 208 converts the result into a digital or analog luminance setting value and converts the result into a pulse control means 510. To send to. At this time, the measured luminance and the set value use the relationship as shown in FIG. 3. If the measured luminance is higher than the design value, the set value of -correction is set to lower the luminance. Outputs the set value of.
【００５０】パルス制御手段510は、前記の＋／−補正
の設定値を受け、記憶手段211から読み出した初期の輝
度設定値に補正の設定値分を加算して＋補正では輝度設
定値が上がり−補正では輝度設定値が下がることにな
り、その結果補正後の輝度設定値を記憶手段211に書き
込みする。以後、パルス制御手段510は輝度を補正した
後の輝度設定値を記憶手段211から読み込み、スイッチ
ング手段502がその輝度設定値に応じたｄｕｔｙ比のパ
ルスの電流を発光素子105へ流すことにより、このパル
スの平均電流で目的の発光輝度に調整された状態を維持
することができる。The pulse control means 510 receives the set value of +/- correction, adds the correction set value to the initial luminance set value read from the storage means 211, and increases the luminance set value by + correction. In the correction, the luminance setting value decreases, and as a result, the corrected luminance setting value is written in the storage unit 211. Thereafter, the pulse control unit 510 reads the luminance set value after correcting the luminance from the storage unit 211, and the switching unit 502 causes a current of a pulse having a duty ratio corresponding to the luminance set value to flow to the light emitting element 105. The state adjusted to the target light emission luminance by the average current of the pulse can be maintained.
【００５１】上記第１乃至第３の実施の形態により、基
板に実装された状態で発光素子の輝度を電流により調整
して発光素子の輝度ばらつきを吸収させることで、バッ
クライトの単色光を所定の安定した輝度にさせることが
可能となる。According to the first to third embodiments, the luminance of the light emitting element is adjusted by the current while being mounted on the substrate to absorb the variation in the luminance of the light emitting element. It is possible to make the luminance stable.
【００５２】（第４の実施の形態）図７は、本発明の第
４の実施形態におけるＬＣＤ照明装置の構成を示すブロ
ック図である。図７において第４の実施形態におけるＬ
ＣＤ照明装置は、発光素子に電流を供給する直流電源10
1と、レーザー光の照射により抵抗値を可変できる複数
の可変抵抗102と、輝度調整手段703と、ＬＣＤ（Liquid
Crystal Display）104と、複数の発光素子105と、ＬＣ
Ｄ表示手段706と、発光素子105の輝度を測定する輝度測
定手段107と、レーザー光を照射するレーザー光照射手
段108と、輝度測定手段107の測定結果に応じ抵抗値の設
定を行なう輝度設定手段109とから構成されている。(Fourth Embodiment) FIG. 7 is a block diagram showing a configuration of an LCD lighting device according to a fourth embodiment of the present invention. In FIG. 7, L in the fourth embodiment
The CD illuminator has a DC power supply 10 for supplying current to the light emitting element.
1, a plurality of variable resistors 102 whose resistance value can be varied by irradiating a laser beam, brightness adjusting means 703, and an LCD (Liquid
Crystal Display) 104, multiple light emitting elements 105, LC
D display means 706, luminance measuring means 107 for measuring the luminance of light emitting element 105, laser light irradiating means 108 for irradiating laser light, and luminance setting means for setting a resistance value according to the measurement result of luminance measuring means 107 109.
【００５３】図７のＬＣＤ照明装置は、上記第１の実施
形態の応用例として多色発光のバックライトの場合であ
り、ＬＣＤ表示手段706内に単色の発光素子105を各々違
う色で発光するＡ，Ｂ，Ｃの３つを有し、発光素子105
一つに対し電流調整のための可変抵抗102一つを組み合
わせ、上記した第１の実施形態と同様な方法でそれぞれ
の発光素子の輝度調整を行なう構成である。The LCD illuminating device shown in FIG. 7 is a multi-color light emitting backlight as an application example of the first embodiment, in which the single color light emitting elements 105 emit light of different colors in the LCD display means 706. A, B, and C.
In this configuration, one variable resistor 102 for current adjustment is combined with one, and the luminance of each light emitting element is adjusted in the same manner as in the first embodiment.
【００５４】最初に発光素子105のＡの輝度を調整す
る。直流電源101を投入すると輝度調整手段703内の可変
抵抗102Ａ，Ｂ，Ｃは初期抵抗値の状態で発光素子105
Ａ，Ｂ，Ｃにそれぞれ電流を流し、発光素子105Ａ，
Ｂ，Ｃが点灯する。この状態で輝度測定手段107は最初
に発光素子105のＡの輝度を測定し、測定輝度を輝度設
定手段109に伝達し設定すべき抵抗値を選択する。その
抵抗値になるようレーザー光照射手段108が可変抵抗102
のＡにレーザー光を照射し抵抗値を可変させることで、
発光素子105のＡに流す電流を変化させて輝度が調整さ
れる。First, the luminance of A of the light emitting element 105 is adjusted. When the DC power supply 101 is turned on, the variable resistors 102A, 102B, and 102C in the brightness adjusting unit 703 have the initial resistance value and the light emitting element 105
A current is applied to each of A, B, and C, and the light emitting elements 105A, 105A,
B and C light up. In this state, the luminance measuring means 107 first measures the luminance of A of the light emitting element 105, transmits the measured luminance to the luminance setting means 109, and selects a resistance value to be set. The laser beam irradiating means 108 is turned to the
By irradiating a laser beam to A and changing the resistance value,
The brightness is adjusted by changing the current flowing through A of the light emitting element 105.
【００５５】この一連の輝度調整過程は上記した第１の
実施形態と同じであり、同様にして発光素子105のＢを
調整する時は輝度測定手段107がＢの輝度を測定してそ
の結果を可変抵抗102のＢへ反映し、発光素子105のＣを
調整する時は輝度測定手段107がＣの輝度を測定してそ
の結果を可変抵抗102のＣへ反映して電流を調整するこ
とにより、発光素子105それぞれの輝度を調整すること
が可能となる。This series of brightness adjustment steps is the same as that of the first embodiment described above. When adjusting B of the light emitting element 105 in the same manner, the brightness measuring means 107 measures the brightness of B, and the result is obtained. When adjusting the C of the light emitting element 105 by reflecting it on the B of the variable resistor 102, the luminance measuring means 107 measures the luminance of C and reflects the result on the C of the variable resistor 102 to adjust the current. The brightness of each of the light emitting elements 105 can be adjusted.
【００５６】（第５の実施の形態）図８は、本発明の第
５の実施形態におけるＬＣＤ照明装置の構成を示すブロ
ック図である。図８において第５の実施形態におけるＬ
ＣＤ照明装置は、発光素子に電流を供給する直流電源10
1と、制御電圧に応じて電流を流す複数の電圧−電流変
換手段202と、輝度調整手段803と、ＬＣＤ（Liquid Cry
stal Display）104と、複数の発光素子105と、ＬＣＤ10
4と複数の発光素子105を備えたＬＣＤ表示手段806と、
発光素子105の輝度を個別に測定する輝度測定手段107
と、輝度測定手段107の輝度測定結果に応じ輝度設定値
に変換出力する変換手段208と、変換手段208を有し輝度
の補正値を設定する輝度設定手段209と、輝度設定値に
応じ電圧−電流変換手段202に制御電圧を出力する制御
手段210と、輝度設定手段209からの輝度設定値を記憶し
ている記憶手段211とから構成されている。(Fifth Embodiment) FIG. 8 is a block diagram showing a configuration of an LCD lighting device according to a fifth embodiment of the present invention. In FIG. 8, L in the fifth embodiment
The CD illuminator has a DC power supply 10 for supplying current to the light emitting element.
1, a plurality of voltage-current conversion means 202 for passing a current according to the control voltage, a brightness adjustment means 803, and an LCD (Liquid Cry).
stal display) 104, a plurality of light emitting elements 105, and the LCD 10
LCD display means 806 including 4 and a plurality of light emitting elements 105;
Luminance measuring means 107 for individually measuring the luminance of light emitting element 105
A converting means 208 for converting and outputting a luminance setting value according to the luminance measurement result of the luminance measuring means 107; a luminance setting means 209 having the converting means 208 for setting a correction value of luminance; The control unit 210 includes a control unit 210 that outputs a control voltage to the current conversion unit 202, and a storage unit 211 that stores a luminance setting value from the luminance setting unit 209.
【００５７】図８のＬＣＤ照明装置は、上記した第２の
実施形態の応用例として多色発光のバックライトの場合
であり、ＬＣＤ表示手段806内に単色の発光素子105を各
々違う色で発光するＡ，Ｂ，Ｃの３つを有し、発光素子
105一つに対し電流調整のための電圧−電流変換手段202
一つを対応させ、上記した第２の実施形態と同様な方法
でそれぞれの発光素子の輝度調整を行なう構成である。The LCD illuminating device shown in FIG. 8 is an application example of the above-described second embodiment in the case of a multi-color light emitting backlight. A, B, and C light emitting elements
Voltage-current conversion means 202 for current adjustment for one 105
In this configuration, the brightness of each light emitting element is adjusted by the same method as in the second embodiment described above.
【００５８】最初に発光素子105のＡの輝度を調整す
る。直流電源101を投入すると輝度調整手段803内の制御
手段210が記憶手段211に記憶されている発光素子105
Ａ，Ｂ，Ｃの初期の輝度設定値を読み込みそれに応じ電
圧―電流変換手段202Ａ，Ｂ，Ｃへ制御電圧を出力し、
電圧−電流変換手段202Ａ，Ｂ，Ｃは図４の関係より前
記制御電圧に応じた電流をそれぞれ発光素子105Ａ，
Ｂ，Ｃに流すことで発光素子105Ａ，Ｂ，Ｃが点灯す
る。First, the luminance of A of the light emitting element 105 is adjusted. When the DC power supply 101 is turned on, the control unit 210 in the brightness adjusting unit 803 causes the light emitting element 105 stored in the storage unit 211 to be stored.
The initial luminance setting values of A, B, and C are read, and control voltages are output to the voltage-current conversion means 202A, B, and C accordingly,
The voltage-current conversion means 202A, 202B, and 202C respectively apply a current corresponding to the control voltage to the light emitting elements 105A, 105A,
By flowing the light through B and C, the light emitting elements 105A, B and C are turned on.
【００５９】この状態で輝度測定手段107は最初に発光
素子105のＡの輝度を測定し測定輝度を輝度設定手段209
に伝達する。輝度設定手段209は輝度測定結果を基に設
計値よりどれだけ差があるかを算出し、その結果から変
換手段208が図３の関係を用いて＋／−補正の設定値へ
変換し制御手段210に送出する。In this state, the luminance measuring means 107 first measures the luminance of A of the light emitting element 105 and sets the measured luminance to the luminance setting means 209.
To communicate. The luminance setting means 209 calculates the difference from the design value based on the luminance measurement result, and the converting means 208 converts the result into a +/- correction set value using the relationship of FIG. Send to 210.
【００６０】制御手段210は、発光素子105Ａの初期の輝
度設定値に前記補正の設定値分を加算し記憶手段211へ
書き込むので、以後上記過程により発光素子105Ａに流
れる電流は補正後の輝度設定値に応じるので、目的の輝
度に調整される。Since the control means 210 adds the correction set value to the initial luminance set value of the light emitting element 105A and writes it to the storage means 211, the current flowing through the light emitting element 105A in the above-described process thereafter becomes the corrected luminance set value. Since the value depends on the value, the luminance is adjusted to a target value.
【００６１】この一連の輝度調整過程は、上記した第２
の実施形態と同じであり、同様にして発光素子105のＢ
を調整する時は輝度測定手段107がＢの輝度を測定して
その結果から電圧−電流変換手段202のＢで電流を調整
し、発光素子105のＣを調整する時は輝度測定手段107が
Ｃの輝度を測定してその結果から電圧−電流変換手段20
2のＣで電流を調整して発光素子105それぞれの輝度を調
整することが可能となる。This series of luminance adjustment steps is performed in the second
Of the light emitting element 105 in the same manner as in the embodiment of FIG.
When adjusting the luminance, the luminance measuring means 107 measures the luminance of B, and based on the result, adjusts the current with B of the voltage-current converting means 202. When adjusting C of the light emitting element 105, the luminance measuring means 107 Of the voltage-current conversion means 20
It is possible to adjust the brightness of each light emitting element 105 by adjusting the current at C of 2.
【００６２】（第６の実施の形態）図９は、本発明の第
６の実施形態におけるＬＣＤ照明装置の構成を示すブロ
ック図である。図９において第６の実施形態におけるＬ
ＣＤ照明装置は、発光素子に電流を供給する直流電源10
1と、電源をオンオフするする複数のスイッチング手段5
02と、輝度調整手段903と、ＬＣＤ（Liquid Crystal Di
splay）104と、複数の発光素子105と、ＬＣＤ104と複数
の発光素子105を備えたＬＣＤ表示手段906と、発光素子
105の輝度を個別に測定する輝度測定手段107と、輝度測
定手段107の輝度測定結果に応じ輝度設定値に変換出力
する変換手段208と、変換手段208を有し輝度の補正値を
設定する輝度設定手段209と、輝度設定値に応じデュー
ティ(ｄｕｔｙ)比を変化させたパルス信号を出力するパ
ルス制御手段510と、輝度設定手段209からの輝度設定値
を記憶している記憶手段211とから構成されている。(Sixth Embodiment) FIG. 9 is a block diagram showing a configuration of an LCD lighting device according to a sixth embodiment of the present invention. In FIG. 9, L in the sixth embodiment
The CD illuminator has a DC power supply 10 for supplying current to the light emitting element.
1 and multiple switching means 5 for turning the power on and off
02, brightness adjusting means 903, and LCD (Liquid Crystal Diode).
splay) 104, a plurality of light emitting elements 105, LCD 104 and LCD display means 906 having the plurality of light emitting elements 105,
A luminance measuring means 107 for individually measuring the luminance of the 105; a converting means 208 for converting and outputting a luminance setting value according to the luminance measurement result of the luminance measuring means 107; and a luminance having the converting means 208 for setting a luminance correction value. The control unit includes a setting unit 209, a pulse control unit 510 that outputs a pulse signal with a changed duty ratio according to the luminance setting value, and a storage unit 211 that stores the luminance setting value from the luminance setting unit 209. Have been.
【００６３】図９のＬＣＤ照明装置は、上記した第３の
実施形態の応用例として多色発光のバックライトの場合
であり、ＬＣＤ表示手段906内に単色の発光素子105を各
々違う色で発光するＡ，Ｂ，Ｃの３つを有し、発光素子
105一つに対し電流制御のためのスイッチング手段502一
つを対応させ、上記した第３の実施形態と同様な方法で
それぞれの発光素子の輝度調整を行なう構成である。The LCD illuminating device shown in FIG. 9 is a multi-color light emitting backlight as an application example of the above-described third embodiment. In the LCD display means 906, single-color light emitting elements 105 emit light of different colors. A, B, and C light emitting elements
In this configuration, one switching means 502 for current control corresponds to one 105, and the brightness of each light emitting element is adjusted in the same manner as in the third embodiment.
【００６４】最初に発光素子105のＡの輝度を調整す
る。直流電源101を投入すると輝度調整手段903内のパル
ス制御手段510が記憶手段211に記憶されている発光素子
105Ａ，Ｂ，Ｃの初期の輝度設定値を読み込みスイッチ
ング手段502Ａ，Ｂ，Ｃへ前記初期の輝度設定値に応じ
たデューティ(ｄｕｔｙ)比のパルス信号を出力する。First, the luminance of A of the light emitting element 105 is adjusted. When the DC power supply 101 is turned on, the pulse control means 510 in the brightness adjustment means 903 stores the light emitting element stored in the storage means 211.
The initial luminance setting values of 105A, B, and C are read, and pulse signals having a duty ratio corresponding to the initial luminance setting values are output to switching means 502A, B, and C.
【００６５】スイッチング手段502Ａ，Ｂ，Ｃは前記パ
ルス信号により発光素子105Ａ，Ｂ，Ｃへの電源供給を
オンオフし、パルス電流を流すことで発光素子105Ａ，
Ｂ，Ｃが点灯する。この状態で輝度測定手段107は最初
に発光素子105のＡの輝度を測定し測定輝度を輝度設定
手段209に伝達する。The switching means 502A, B, and C turn on / off the power supply to the light emitting elements 105A, B, and C by the pulse signal, and supply a pulse current to the light emitting elements 105A, 105A.
B and C light up. In this state, the luminance measuring means 107 first measures the luminance of A of the light emitting element 105 and transmits the measured luminance to the luminance setting means 209.
【００６６】輝度設定手段209は、輝度測定結果を基に
設計値よりどれだけ差があるかを算出し、その結果から
変換手段208が＋／−補正の設定値へ変換しパルス制御
手段510に送出する。パルス制御手段510は発光素子105
Ａの初期の輝度設定値に前記補正の設定値分を加算し記
憶手段211へ書き込むので、以後上記過程によりスイッ
チング手段502のパルス電流出力のデューティ(ｄｕｔ
ｙ)比は補正後の輝度設定値に応じ、発光素子105Ａに流
れる電流の平均値が調整されるため目的の輝度に調整さ
れる。The luminance setting means 209 calculates the difference from the design value based on the luminance measurement result, and the converting means 208 converts the result to a +/- correction set value and sends it to the pulse control means 510. Send out. The pulse control means 510 is a light emitting element 105
A is added to the initial brightness set value of A and the correction set value is written to the storage means 211. Thereafter, the duty (dut) of the pulse current output of the
y) The ratio is adjusted to the target luminance because the average value of the current flowing through the light emitting element 105A is adjusted according to the corrected luminance setting value.
【００６７】この一連の輝度調整過程は、上記した第３
の実施形態と同じであり、同様にして発光素子105のＢ
を調整する時は輝度測定手段107がＢの輝度を測定して
その結果からスイッチング手段502のＢで電流を制御
し、発光素子105のＣを調整する時は輝度測定手段107が
Ｃの輝度を測定してその結果からスイッチング手段502
のＣで電流を制御して発光素子105それぞれの輝度を調
整することが可能となる。This series of brightness adjustment steps is performed in the third step.
Of the light emitting element 105 in the same manner as in the embodiment of FIG.
When adjusting the luminance, the luminance measuring means 107 measures the luminance of B, and based on the result, the current is controlled by B of the switching means 502. When adjusting C of the light emitting element 105, the luminance measuring means 107 measures the luminance of C. The switching means 502 is measured and the
It is possible to adjust the brightness of each of the light emitting elements 105 by controlling the current with C.
【００６８】なお、上記第４乃至第６の実施の形態では
各々異なる色の単色発光素子を複数有して発光させる例
を述べたが、前記複数の単色発光素子を一体化させた１
素子で２つ以上の色を個別に発光できる発光素子もあ
り、この場合も上記実施形態を使用して輝度調整が可能
である。In the fourth to sixth embodiments, an example has been described in which a plurality of single-color light-emitting elements having different colors are provided to emit light.
Some light-emitting elements can individually emit two or more colors. In this case, the luminance can be adjusted using the above embodiment.
【００６９】上記第４乃至第６の実施の形態における多
色発光のバックライトの例では、発光素子105のＡ，
Ｂ，Ｃの各単色だけではなく、ＡとＢ、ＡとＣ、Ｂと
Ｃ、ＡとＢとＣの同時発光による混合色も考えられ全部
で７色発光が可能である。ゆえに、これらの実施形態に
よれば単色の輝度ばらつきを軽減するだけではなく、混
合色における輝度ばらつきや色むらも軽減させる効果が
あるため、多色発光のバックライトを所定の安定した輝
度や色調にさせることが可能となる。In the example of the backlight of the multi-color emission in the fourth to sixth embodiments, A,
Not only the single colors of B and C, but also A and B, A and C, B and C, and mixed colors by simultaneous emission of A, B and C are possible, and a total of seven colors can be emitted. Therefore, according to these embodiments, not only the luminance variation of a single color is reduced, but also the luminance variation and color unevenness in a mixed color are reduced, so that a multi-color light emitting backlight has a predetermined stable luminance and color tone. It becomes possible to make it.
【００７０】なお、全ての上記手段に加えＬＣＤ104と
発光素子105との間に、光を均一に照射させるように表
面処理を施した白色の樹脂板を挿入すると、さらに輝度
むらや色むらを軽減させるのに効果的である。When a white resin plate subjected to a surface treatment so as to uniformly irradiate light is inserted between the LCD 104 and the light emitting element 105 in addition to all of the above means, unevenness in brightness and uneven color is further reduced. It is effective to make it.
【００７１】[0071]
【発明の効果】以上のように本発明は、基板上に実装さ
れた発光素子の輝度を測定し、発光素子へ流す電流を制
御することで発光素子個々の輝度ばらつきを吸収させ
る。これにより、ＬＣＤ表示手段におけるＬＣＤのバッ
クライトとして安定した輝度を得ることができ、単色光
の輝度ばらつきや混合色の色むらを軽減させる効果があ
る。As described above, according to the present invention, the luminance of the light emitting element mounted on the substrate is measured, and the luminance variation of each light emitting element is absorbed by controlling the current flowing to the light emitting element. As a result, a stable luminance can be obtained as a backlight of the LCD in the LCD display means, and there is an effect of reducing luminance variation of monochromatic light and color unevenness of mixed colors.
【図１】本発明の第１の実施形態におけるＬＣＤ照明装
置の構成を示すブロック図、FIG. 1 is a block diagram showing a configuration of an LCD lighting device according to a first embodiment of the present invention;
【図２】本発明の第２の実施形態におけるＬＣＤ照明装
置の構成を示すブロック図、FIG. 2 is a block diagram showing a configuration of an LCD lighting device according to a second embodiment of the present invention;
【図３】変換手段208における輝度と設定値の関係を示
す特性図、FIG. 3 is a characteristic diagram showing a relationship between luminance and a set value in a conversion unit 208;
【図４】電圧−電流変換手段202における制御電圧と電
流出力の関係を示す特性図、FIG. 4 is a characteristic diagram showing a relationship between a control voltage and a current output in a voltage-current conversion unit 202;
【図５】本発明の第３の実施形態におけるＬＣＤ照明装
置の構成を示すブロック図、FIG. 5 is a block diagram showing a configuration of an LCD lighting device according to a third embodiment of the present invention;
【図６】パルス制御手段510の出力パルスとスイッチン
グ手段502の出力する電流と発光素子105の輝度との関係
を示した図、FIG. 6 is a diagram showing a relationship between an output pulse of a pulse control unit 510, a current output from a switching unit 502, and luminance of a light emitting element 105;
【図７】本発明の第４の実施形態におけるＬＣＤ照明装
置の構成を示すブロック図、FIG. 7 is a block diagram showing a configuration of an LCD lighting device according to a fourth embodiment of the present invention;
【図８】本発明の第５の実施形態におけるＬＣＤ照明装
置の構成を示すブロック図、FIG. 8 is a block diagram showing a configuration of an LCD lighting device according to a fifth embodiment of the present invention;
【図９】本発明の第６の実施形態におけるＬＣＤ照明装
置の構成を示すブロック図、FIG. 9 is a block diagram showing a configuration of an LCD lighting device according to a sixth embodiment of the present invention;
【図１０】従来のＬＣＤ照明装置の構成を示すブロック
図である。FIG. 10 is a block diagram showing a configuration of a conventional LCD lighting device.
101 直流電源 102 可変抵抗 103、203、503 輝度調整手段 703、803、903 輝度調整手段 104 ＬＣＤ 105 発光素子 106、706、806、906 ＬＣＤ表示手段 107 輝度測定手段 108 レーザー光照射手段 109、209 輝度設定手段 202 電圧−電流変換手段 208 変換手段 210 制御手段 211 記憶手段 502 スイッチング手段 510 パルス制御手段 1002 固定抵抗 101 DC power supply 102 Variable resistor 103, 203, 503 Brightness adjusting means 703, 803, 903 Brightness adjusting means 104 LCD 105 Light emitting element 106, 706, 806, 906 LCD display means 107 Brightness measuring means 108 Laser light irradiation means 109, 209 Brightness Setting means 202 Voltage-current conversion means 208 Conversion means 210 Control means 211 Storage means 502 Switching means 510 Pulse control means 1002 Fixed resistance
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11119922AJP2000310761A (en) | 1999-04-27 | 1999-04-27 | LCD lighting device |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11119922AJP2000310761A (en) | 1999-04-27 | 1999-04-27 | LCD lighting device |
| Publication Number | Publication Date |
|---|---|
| JP2000310761Atrue JP2000310761A (en) | 2000-11-07 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11119922APendingJP2000310761A (en) | 1999-04-27 | 1999-04-27 | LCD lighting device |
| Country | Link |
|---|---|
| JP (1) | JP2000310761A (en) |
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| JP2004029141A (en)* | 2002-06-21 | 2004-01-29 | Mitsubishi Electric Corp | Back light source for display device, liquid crystal display device, and method of adjusting back light source |
| JP2006286935A (en)* | 2005-03-31 | 2006-10-19 | Sharp Corp | Light source module, backlight unit, liquid crystal display device |
| WO2008066040A1 (en)* | 2006-11-29 | 2008-06-05 | Panasonic Corporation | Video display device, video display method, program and recording medium |
| JP2010044399A (en)* | 2009-09-15 | 2010-02-25 | Mitsubishi Electric Corp | Planar light source device and liquid crystal display device using the same |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004029141A (en)* | 2002-06-21 | 2004-01-29 | Mitsubishi Electric Corp | Back light source for display device, liquid crystal display device, and method of adjusting back light source |
| JP2006286935A (en)* | 2005-03-31 | 2006-10-19 | Sharp Corp | Light source module, backlight unit, liquid crystal display device |
| WO2008066040A1 (en)* | 2006-11-29 | 2008-06-05 | Panasonic Corporation | Video display device, video display method, program and recording medium |
| JP2010044399A (en)* | 2009-09-15 | 2010-02-25 | Mitsubishi Electric Corp | Planar light source device and liquid crystal display device using the same |
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