TW202001369A

Movatterモバイル変換

Info

Publication number: TW202001369A
Application number: TW107120216A
Authority: TW
Inventors: 曾立偉; 蔡卲瑜; 薛芷苓
Original assignee: 友達光電股份有限公司
Priority date: 2018-06-12
Filing date: 2018-06-12
Publication date: 2020-01-01
Also published as: CN108957858A; TWI661251B; CN108957858B

Abstract

A backlight module including a light guide chamber, a light emitting area and a wavelength transforming layer is provided. The light emitting area and the wavelength transforming layer covered thereon is disposed on one side of the light guide chamber, and the light guide chamber is extended along a direction from the side. The maximum thickness of the chamber is a First value. Along the direction, the ratio of the widths of the light emitting area to the wavelength transforming layer is a Second value. When the First value is no more than 40 mm, the Second value is in the range of 0.5 to 1.

Description

Translated fromChinese

背光模組 Backlight module

本發明有關一種背光模組，特別是一種具有導光腔的背光模組。The invention relates to a backlight module, in particular to a backlight module with a light guide cavity.

平面及曲面顯示技術已經廣泛地應用於例如是行動電話、個人穿戴裝置、電視、電腦等電子裝置中。然而隨著解析度、窄邊框等規格要求的不斷提高，顯示裝置內的光學設計也不斷地受到考驗。Flat and curved display technologies have been widely used in electronic devices such as mobile phones, personal wearable devices, televisions, and computers. However, with the continuous improvement of specifications such as resolution and narrow bezels, the optical design in the display device is constantly being tested.

以液晶顯示技術為例，此類的非自發光型顯示裝置的畫素本身需要以外部光源照射，而以控制畫素對發光能量的穿透率或反射率來決定其亮暗程度。因此液晶顯示裝置的光學表現與作為外部光源的背光模組息息相關。Taking liquid crystal display technology as an example, the pixels of such non-self-luminous display devices need to be irradiated with an external light source, and the brightness or darkness of the pixels is controlled by controlling the transmittance or reflectance of the pixels to the luminous energy. Therefore, the optical performance of the liquid crystal display device is closely related to the backlight module as an external light source.

現今所用的背光模組又還可以大致分為側光式以及直下式兩大類型；其中側光式背光模組設計中，部分會採取無導光板之設計，此種設計形式會利用位於螢幕側邊以及背面的反射面來反射位於側邊的光源所發出的光，作為液晶畫素所需的光源。同時，這些反射面之間所形成的空間可作為混光空間(導光腔)，提供這些光進行均勻的混光。然而，在顯示裝置薄型化的趨勢帶動下，顯示裝置的厚度隨著不斷降低時，上述之混光空間亦隨之壓縮，對於光提供的混光效果相對不足，因此這類側光式背光模組所提供的背光容易產生色偏的現象。因此，如何提供具有良好畫面品質的背光模組成為現在薄型化顯示科技中需要解決的問題之一。The backlight modules used today can also be roughly divided into two types: edge-lit type and direct-lit type. Among the edge-lit backlight module designs, some will adopt a design without a light guide plate, and this design form will be located on the screen side The reflection surfaces on the side and the back surface reflect the light emitted by the light source located on the side and serve as the light source required for the liquid crystal pixels. At the same time, the space formed between these reflecting surfaces can be used as a light mixing space (light guide cavity) to provide uniform mixing of these lights. However, driven by the trend toward thinner display devices, as the thickness of the display device continues to decrease, the above light mixing space is also compressed, and the light mixing effect provided by the light is relatively insufficient, so this type of edge-light backlight mode The backlight provided by the group is prone to color shift. Therefore, how to provide a backlight module with good picture quality has become one of the problems to be solved in the current thin display technology.

本發明之目的在於提供一種背光模組，其可以減少顯示畫面上的色偏現象。The purpose of the present invention is to provide a backlight module, which can reduce the color shift phenomenon on the display screen.

本發明的背光模組包括光源裝置以及導光腔，光源裝置設置於導光腔的入光部。光源裝置包括發光區以及波長轉換層，波長轉換層設置於發光區上。發光區發出的光經過波長轉換層進行波長轉換後形成照明光，導光腔的入光部接收此照明光。The backlight module of the present invention includes a light source device and a light guide cavity, and the light source device is disposed at the light incident part of the light guide cavity. The light source device includes a light-emitting area and a wavelength conversion layer, and the wavelength conversion layer is disposed on the light-emitting area. The light emitted from the light-emitting area undergoes wavelength conversion through the wavelength conversion layer to form illumination light, and the light incident portion of the light guide cavity receives this illumination light.

導光腔包括出光面、反射面以及上述的入光部，其中入光部和出光面沿著一第一方向排列，且入光部位於出光面的一端以及反射面的一端之間。光源裝置自入光部往反射面發出照明光，被反射面反射的照明光自出光面離開導光腔。The light guide cavity includes a light exit surface, a reflection surface, and the aforementioned light incident portion, wherein the light incident portion and the light exit surface are arranged along a first direction, and the light incident portion is located between one end of the light exit surface and one end of the reflection surface. The light source device emits illumination light from the light incident part to the reflection surface, and the illumination light reflected by the reflection surface leaves the light guide cavity from the light exit surface.

在出光面的法線方向上，出光面與反射面之間的最大距離的數值為第一數值。在平行於出光面之虛擬參考面上，發光區的投影範圍在第一方向上具有第一寬度；波長轉換層的投影範圍在第二方向上具有第二寬度，且第一寬度和第二寬度的比值為第二數值。本發明的實施例的背光模組符合以下規則：In the normal direction of the light exit surface, the value of the maximum distance between the light exit surface and the reflection surface is the first value. On the virtual reference plane parallel to the light exit surface, the projection range of the light-emitting area has a first width in the first direction; the projection range of the wavelength conversion layer has a second width in the second direction, and the first width and the second width The ratio is the second value. The backlight module of the embodiment of the present invention meets the following rules:

當第一數值沒有超過40毫米時，第二數值落在0.5至1的範圍。When the first value does not exceed 40 mm, the second value falls within the range of 0.5 to 1.

由上述可知，本發明的背光模組中的波長轉換層與發光區的設置可以與導光腔的厚度搭配，所以背光模組可以再不同厚度提供良好的面光源。It can be seen from the above that the arrangement of the wavelength conversion layer and the light emitting area in the backlight module of the present invention can be matched with the thickness of the light guide cavity, so the backlight module can provide a good surface light source with different thicknesses.

C‧‧‧混光空間C‧‧‧mixed light space

d1、d2‧‧‧方向d1, d2‧‧‧ direction

w1、w2、w3‧‧‧寬度w1, w2, w3‧‧‧Width

100‧‧‧顯示裝置100‧‧‧Display device

110‧‧‧顯示面板110‧‧‧Display panel

200‧‧‧背光模組200‧‧‧Backlight module

210‧‧‧光源裝置210‧‧‧Light source device

210P‧‧‧投影區域210P‧‧‧Projection area

211‧‧‧發光單元211‧‧‧Lighting unit

211A‧‧‧發光區211A‧‧‧Lighting area

212‧‧‧波長轉換層212‧‧‧wavelength conversion layer

213‧‧‧準直器213‧‧‧collimator

214‧‧‧承載台214‧‧‧Carrying platform

220‧‧‧導光腔220‧‧‧Light guide cavity

221‧‧‧入光端221‧‧‧Into the light

222‧‧‧光學膜片222‧‧‧Optical diaphragm

222F‧‧‧參考面222F‧‧‧Reference plane

222P、222Q‧‧‧投影區域222P, 222Q‧‧‧Projection area

222S‧‧‧出光面222S‧‧‧Lighting

223‧‧‧背板223‧‧‧Backboard

223S‧‧‧反射面223S‧‧‧Reflective surface

圖1為顯示裝置之實施例元件爆炸圖；圖2A為發光區以及波長轉換層之實施例仰視圖；圖2B為顯示裝置之實施例剖視圖；圖3A及圖3B為第一實驗範例的數據圖；圖4A及圖4B為第二實驗範例的數據圖；圖5A及圖5B為第三實驗範例的數據圖；圖6A及圖6B為第四實驗範例的數據圖。1 is an exploded view of an embodiment of a display device; FIG. 2A is a bottom view of an embodiment of a light emitting region and a wavelength conversion layer; FIG. 2B is a cross-sectional view of an embodiment of a display device; FIGS. 3A and 3B are data diagrams of a first experimental example Figures 4A and 4B are data diagrams of the second experimental example; Figures 5A and 5B are data diagrams of the third experimental example; Figures 6A and 6B are data diagrams of the fourth experimental example.

本發明提出的背光模組可以提供一個面光源，其可以應用在例如是液晶顯示(Liquid Crystal Display,LCD)或電泳顯示(Electrophoresis Display,EPD)等非自發光顯示裝置中，在此類裝置中提供背光源(Backlight)；這些裝置較佳可應用在電腦顯示器、電視、監視器上。此外，顯示裝置亦可應用在其他電子裝置上，例如作為手機、數位相機、平板電腦或掌上型遊樂器等的顯示屏幕。The backlight module proposed by the present invention can provide a surface light source, which can be applied to non-self-luminous display devices such as Liquid Crystal Display (LCD) or Electrophoresis Display (EPD), etc. Provide backlight; these devices can be applied to computer monitors, televisions, and monitors. In addition, the display device can also be applied to other electronic devices, for example, as a display screen of a mobile phone, a digital camera, a tablet computer, or a handheld game instrument.

圖1為本發明第一實施例中顯示裝置之實施例元件爆炸圖。請參照圖1，本發明的第一實施例的顯示裝置100包括背光模組200以及顯示面板110。顯示面板110例如是包含多個顯示像素的液晶面板，且顯示面板110配置於背光模組200上並具有多個畫素(PIXEL)。FIG. 1 is an exploded view of an embodiment element of a display device in a first embodiment of the invention. Referring to FIG. 1, thedisplay device 100 according to the first embodiment of the present invention includes abacklight module 200 and adisplay panel 110. Thedisplay panel 110 is, for example, a liquid crystal panel including a plurality of display pixels, and thedisplay panel 110 is disposed on thebacklight module 200 and has a plurality of pixels (PIXEL).

背光模組200包括光源裝置210以及導光腔220，光源裝置210配置於導光腔220的入光端221。導光腔220還包括出光面222S和反射面 223S，入光端221位於出光面222S之一端以及反射面223S之一端之間。在本實施例中，反射面223S例如是白色的表面，較佳為白色的曲面；出光面222S例如是可以透光的表面，較佳為一擴散板的表面。在本實施例中，導光腔220的厚度沿著至少一方向變化，導光腔220較佳在靠近入光端221的位置具有較大的厚度，在此位置的出光面222S和反射面223S之間的距離較大；導光腔較佳在遠離入光端221的位置具有較小的厚度，在此位置的出光面222S和反射面223S之間的距離較小。Thebacklight module 200 includes alight source device 210 and alight guide cavity 220. Thelight source device 210 is disposed at the light entrance end 221 of thelight guide cavity 220. Thelight guide cavity 220 further includes a light exit surface 222S and a reflection surface 223S. The light entrance end 221 is located between one end of the light exit surface 222S and one end of the reflection surface 223S. In this embodiment, the reflective surface 223S is, for example, a white surface, preferably a white curved surface; the light exit surface 222S is, for example, a surface that can transmit light, preferably a diffuser surface. In this embodiment, the thickness of thelight guide cavity 220 varies along at least one direction. Thelight guide cavity 220 preferably has a larger thickness near the light entrance end 221, and the light exit surface 222S and the reflection surface 223S at this location The distance between them is larger; the light guide cavity preferably has a smaller thickness at a position away from the light entrance end 221, and the distance between the light exit surface 222S and the reflection surface 223S at this position is smaller.

具體而言，本實施例的背光模組包括光學膜片222以及背板223，形成具有一混光空間C的導光腔220。混光空間C位於光學膜片222所提供的出光面222S以及背板223所提供的反射面223S之間。光學膜片222和背板223都自入光端221延伸，光學膜片222實質上為水平延伸並提供水平的出光面222S；背板223和光學膜片222之間的距離可以沿著至少一方向改變。舉例而言，在方向d1上，背板223和光學膜片222之間的距離逐漸降低，反射面223S也逐漸向出光面222S彎曲。Specifically, the backlight module of this embodiment includes anoptical film 222 and aback plate 223 to form alight guide cavity 220 having a light mixing space C. The light mixing space C is located between the light exit surface 222S provided by theoptical film 222 and the reflection surface 223S provided by theback plate 223. Both theoptical film 222 and theback plate 223 extend from the light entrance end 221. Theoptical film 222 substantially extends horizontally and provides a horizontal light exit surface 222S; the distance between theback plate 223 and theoptical film 222 can be along at least one The direction changes. For example, in the direction d1, the distance between theback plate 223 and theoptical film 222 gradually decreases, and the reflection surface 223S also gradually curves toward the light exit surface 222S.

光學膜片222可以是透明玻璃，較佳為擴散板或其他能使光均勻化的透光面板；背板223可以是由反射片形成，亦可以是經加工處理之帶有反射表面的殼體，較佳是由可以散射出白色光的散射片形成。Theoptical film 222 can be transparent glass, preferably a diffuser or other light-transmitting panel that can homogenize the light; theback plate 223 can be formed by a reflective sheet, or it can be a processed shell with a reflective surface It is preferably formed by a diffusion sheet that can diffuse white light.

光源裝置210提供的光自導光腔220的入光端221進入混光空間C中。光源裝置210包括發光單元211以及波長轉換層212，發光區211A形成在發光單元211的表面。波長轉換層212例如是螢光粉(phosphor)，發光單元211例如是發光二極體(LED)，發光區211A較佳為發光單元211發出光的表面。波長轉換層212配置在發光單元211上，並覆蓋於發光區211A，至少一部分發光單元221發出的光會經由波長轉換層212轉換後而形成另一波長的光。本發明的波長轉換層212的材料並不限於上述的螢光粉，在其他實施例中可以是奈米粒子，較佳為長寬高在100奈米以下的量子點(Quantum dot)。The light provided by thelight source device 210 enters the light mixing space C from the light input end 221 of thelight guide cavity 220. Thelight source device 210 includes alight emitting unit 211 and awavelength conversion layer 212, and alight emitting region 211A is formed on the surface of thelight emitting unit 211. Thewavelength conversion layer 212 is, for example, phosphor, the light-emittingunit 211 is, for example, a light-emitting diode (LED), and the light-emittingregion 211A is preferably a surface from which the light-emittingunit 211 emits light. Thewavelength conversion layer 212 is disposed on thelight emitting unit 211 and covers thelight emitting region 211A. At least a part of the light emitted by the light emitting unit 221 is converted by thewavelength conversion layer 212 to form light of another wavelength. The material of thewavelength conversion layer 212 of the present invention is not limited to the above-mentioned phosphors, and in other embodiments may be nano particles, preferably quantum dots with a length, width and height of less than 100 nanometers.

本實施例的光源裝置210提供光至導光腔220，且較佳為發散角較低的光。舉例而言，光源裝置210較佳可包含準直器213以及承載台214，配置於承載台214的發光單元211發出的光被準直器213反射至導光腔220，使進入導光腔220的光的發散角較低，甚至以實質上平行光或接近平行光的形態經入光端221進入混光空間C。準直器213例如是一反射凹面，發光單元211藉由承載台214來調整出光角度並搭配準直器213來調整發散角度，本發明不限於光源裝置210的準直器213及其類型。Thelight source device 210 of this embodiment provides light to thelight guide cavity 220, and is preferably light with a low divergence angle. For example, thelight source device 210 may preferably include acollimator 213 and a carryingstage 214. The light emitted by thelight emitting unit 211 disposed on the carryingstage 214 is reflected by thecollimator 213 to thelight guide cavity 220 to enter thelight guide cavity 220 The light has a low divergence angle, and even enters the light mixing space C through the light entrance end 221 in the form of substantially parallel light or near-parallel light. Thecollimator 213 is, for example, a reflective concave surface. The light-emittingunit 211 adjusts the light-emitting angle through thecarrier 214 and thecollimator 213 to adjust the divergence angle. The present invention is not limited to thecollimator 213 and the type of thelight source device 210.

請參照圖1，在平行於出光面222的虛擬參考面222F上，光源裝置210有投影區域210P；光學膜片222有投影區域222P，且光學膜片222連接入光端221的一邊的投影區域222Q沿著方向d2延伸。此處參照元件的相對位置以虛擬的參考面敘述各元件的相對關係，藉以清楚說明各元件的特徵，並非用以限定本發明。在平行於出光面222S的參考面上，光源裝置210的投影區域210P和光學膜片222的投影區域222P沿著方向d1排列。以下將對應這些方向d1、d2進一步說明本發明的背光模組200中各個元件的細部特徵。Referring to FIG. 1, on avirtual reference plane 222F parallel to thelight exit surface 222, thelight source device 210 has aprojection area 210P; theoptical film 222 has aprojection area 222P, and theoptical film 222 is connected to the projection area on the side of the optical end 221 222Q extends along the direction d2. Here, the relative relationship of each element is described with a virtual reference plane with reference to the relative position of the element, so as to clearly explain the characteristics of each element, and is not intended to limit the present invention. On the reference plane parallel to the light exit surface 222S, theprojection area 210P of thelight source device 210 and theprojection area 222P of theoptical film 222 are arranged along the direction d1. The detailed features of each element in thebacklight module 200 of the present invention will be further described below corresponding to these directions d1, d2.

圖2A是本發明第一實施例的發光區及波長轉換層的仰視示意圖。請參照圖2A，本實施例的光源裝置210例如包括多個沿著方向d2排列的發光單元211，這些發光單元211配置在承載台214並被波長轉換層212覆蓋，且這些發光單元211的發光區211A以及波長轉換層212的分布區域在垂直於排列方向d2的方向上的寬度的比值相近。舉例而言，發光區211在上述參考面222F的投影區域在方向d1上具有寬度w1；波長轉換層212在上述參考面222F的投影區域在方向d1上具有寬度w2。2A is a schematic bottom view of the light emitting region and the wavelength conversion layer of the first embodiment of the present invention. Referring to FIG. 2A, thelight source device 210 of this embodiment includes, for example, a plurality of light emittingunits 211 arranged along the direction d2. Thelight emitting units 211 are disposed on thestage 214 and covered by thewavelength conversion layer 212. The ratio of the width of the distribution area of theregion 211A and thewavelength conversion layer 212 in the direction perpendicular to the arrangement direction d2 is similar. For example, the projection area of thelight emitting region 211 in thereference plane 222F has a width w1 in the direction d1; the projection area of thewavelength conversion layer 212 in thereference plane 222F has a width w2 in the direction d1.

詳細而言，在本實施例中，發光區211A的分布區域在方向d1上的中心點(例如形心)鄰近波長轉換層212的分布區域在方向d1上的中心點(例如形心)，在方向d1上發光區211A實質上是以置中的方式配置於波長轉換層212中，藉以使自發光區211A經波長轉換層212發出的光的出光角度在方向d1上不會偏移。然而，本發明並不限於此，在其他實施例中，發光區211A的分布區域以及波長轉換層212的分布區域在方向d1上的安排亦可隨需求調整。In detail, in this embodiment, the center point (eg, centroid) of the distribution area of thelight emitting region 211A in the direction d1 is adjacent to the center point (eg, centroid) of the distribution area of thewavelength conversion layer 212 in the direction d1, in The light-emittingregion 211A in the direction d1 is substantially disposed in thewavelength conversion layer 212 in a centered manner, so that the light emitting angle of the light emitted from the light-emittingregion 211A through thewavelength conversion layer 212 does not shift in the direction d1. However, the present invention is not limited to this. In other embodiments, the arrangement of the distribution area of the light-emittingarea 211A and the distribution area of thewavelength conversion layer 212 in the direction d1 can also be adjusted as required.

圖2B是本發明第一實施例的顯示裝置的局部剖面示意圖。請參照圖2B，光源裝置210的發光單元211自發光區211A發出光後經波長轉換層212轉換後形成照明光L。照明光L經準直器213反射後進入導光腔220的混光空間C。混光空間C的厚度隨著背板223的彎曲逐漸降低。由於準直器213例如是一個反射凹面，自準直器213反射至混光空間C的光束的發散角較小，且背板223的彎曲反射面223S在遠離光源裝置210的區域的彎曲程度較大，照明光L在遠離光源裝置210的區域可以有較多的光被背板223的反射面223S反射往出光面222S，以增加光學膜片222提供的面光源的均勻度。換句話說，經由準直器213反射並降低照明光L的發散角後，背光模組200所提供給顯示面板110的面光源可以藉由背板223的反射面223S調整。2B is a schematic partial cross-sectional view of the display device according to the first embodiment of the invention. Referring to FIG. 2B, thelight emitting unit 211 of thelight source device 210 emits light from thelight emitting region 211A, and is converted by thewavelength conversion layer 212 to form illumination light L. The illumination light L is reflected by thecollimator 213 and enters the light mixing space C of thelight guide cavity 220. The thickness of the light mixing space C gradually decreases as theback plate 223 bends. Since thecollimator 213 is, for example, a reflective concave surface, the divergence angle of the light beam reflected from thecollimator 213 to the light mixing space C is small, and the curved reflection surface 223S of theback plate 223 is more curved in the area away from thelight source device 210 Larger, the illumination light L can have more light reflected by the reflection surface 223S of theback plate 223 toward the light exit surface 222S in the area away from thelight source device 210, so as to increase the uniformity of the surface light source provided by theoptical film 222. In other words, after reflecting and reducing the divergence angle of the illumination light L through thecollimator 213, the surface light source provided by thebacklight module 200 to thedisplay panel 110 can be adjusted by the reflection surface 223S of theback plate 223.

本實施例的波長轉換層212和發光區211A在空間上分布的比例較佳與導光腔220的厚度相互搭配，因此背光模組200可以提供良好的光源。出光面222S和反射面223S在出光面222S的法線方向上的最大距離為寬度w3；波長轉換層212在方向d1上的寬度為w2；發光區211A在方向d1上的寬度為w1，則本實施例的背光模組200符合以下規則：當第一數值沒有超過40毫米時，第二數值落在0.5至1的範圍；其中第一數值為寬度w3，第二數值為寬度w1和寬度w2的比值，即

。藉由具有上述特徵的背光模組200，發光區211A搭配波長轉換層212可以提供的照明光L顏色較均勻，可以避免照明光L自出光面222S發出時因為照明光L的顏色不均勻而導致在出光面222S上形成色偏或黃色光比例較高的黃帶，而顯示裝置100可以顯示良好的畫面。The ratio of the spatial distribution of thewavelength conversion layer 212 and thelight emitting area 211A in this embodiment is preferably matched with the thickness of thelight guide cavity 220, so thebacklight module 200 can provide a good light source. The maximum distance between the light emitting surface 222S and the reflecting surface 223S in the normal direction of the light emitting surface 222S is the width w3; the width of thewavelength conversion layer 212 in the direction d1 is w2; the width of thelight emitting region 211A in the direction d1 is w1, then theThe backlight module 200 of the embodiment meets the following rules: when the first value does not exceed 40 mm, the second value falls within the range of 0.5 to 1; wherein the first value is the width w3, and the second value is the width w1 and the width w2 Ratio, ie

. With thebacklight module 200 having the above characteristics, thelight emitting area 211A and thewavelength conversion layer 212 can provide a uniform color of the illumination light L, which can prevent the illumination light L from being emitted from the light emitting surface 222S due to the uneven color of the illumination light L A yellow band with a high color shift or a high proportion of yellow light is formed on the light exit surface 222S, and thedisplay device 100 can display a good picture.

舉例而言，本實施例的發光單元211例如是短波長光源的發光二極體，較佳為藍光發光二極體，而波長轉換層212較佳為可以被藍光激發出黃色光的螢光粉。當光源裝置210符合上述的規則時，進入混光空間C的照明光L中黃光以及藍光的比例可以在混光空間C中混合為適當的白光，藉以使顯示裝置100不會有色偏的現象，尤其在方向d1上不會有嚴重的顏色變化量。For example, the light-emittingunit 211 of this embodiment is, for example, a light-emitting diode of a short-wavelength light source, preferably a blue light-emitting diode, and thewavelength conversion layer 212 is preferably a phosphor that can be excited by blue light to emit yellow light. . When thelight source device 210 complies with the above-mentioned rules, the ratio of yellow light and blue light in the illumination light L entering the light mixing space C can be mixed into an appropriate white light in the light mixing space C, so that thedisplay device 100 does not have a color shift phenomenon , Especially in the direction d1 there will be no serious amount of color change.

本實施例的發光單元211例如可以發出波長落在350奈米至500奈米的光，而波長轉換層212例如可以吸收來自發光單元211的光並發出波長落在450奈米至850奈米的光，藉由上述這些光的混合來提供適當的白色光。Thelight emitting unit 211 of this embodiment can emit light with a wavelength falling between 350 nm and 500 nm, for example, and thewavelength conversion layer 212 can absorb light from thelight emitting unit 211 and emit light with a wavelength falling between 450 nm and 850 nm, for example. Light, by mixing these light to provide the appropriate white light.

以下將列舉數個實驗範例來一併說明，其中個實驗範例的實施方式與上述實施例類似，以下將一併參照上述實施例的元件以及標號來詳細說明。The following will list several experimental examples to explain together. The implementation of each experimental example is similar to the above-mentioned embodiment. The following will refer to the elements and reference numbers of the above-mentioned embodiment for detailed description.

在一第一實驗範例中，上述背光模組200中反射面223S和出光面222S之間的第一數值為40毫米，並在此背光模組200中分別以第二數值為0.3、0.4、0.5、0.6、0.7及0.8的發光區211A以及波長轉換層212來測試，並沿著方向d1記錄黃光以及藍光在出光面222S的比例以及變異量。In a first experimental example, the first value between the reflective surface 223S and the light emitting surface 222S in thebacklight module 200 is 40 mm, and the second value in thebacklight module 200 is 0.3, 0.4, 0.5, respectively , 0.6, 0.7, and 0.8 of the light-emittingregion 211A and thewavelength conversion layer 212 to test, and record the proportion and variation of yellow light and blue light on the light exit surface 222S along the direction d1.

圖3A是第一實驗範例的黃光、藍光比例沿著上述方向d1記錄的實驗結果。請參照圖3A，橫座標的y值為出光面222S上沿著方向d1與光源裝置210(亦即入光端)之間的距離(單位為公釐)；縱座標為黃光強度對藍光強度的比例；實驗數據各自表示為：數據S13為第二數值為0.3的光源裝置的實驗結果；數據S14為第二數值為0.4的光源裝置的實驗結果；數據S15為第二數值為0.5的光源裝置的實驗結果；數據S16為第二數值為0.6的光源裝置的實驗結果；數據S17為第二數值為0.7的光源裝置的實驗結果；數據S18為第二數值為0.8的光源裝置的實驗結果。FIG. 3A is an experimental result of the ratio of yellow light to blue light of the first experimental example recorded along the above-mentioned direction d1. Please refer to FIG. 3A, the y value of the abscissa is the distance between the light source device 222S along the direction d1 and the light source device 210 (that is, the light entrance end) (unit is mm); the ordinate is the intensity of yellow light to the intensity of blue light The experimental data are expressed as: data S13 is the experimental result of the light source device with the second value of 0.3; data S14 is the experimental result of the light source device with the second value of 0.4; data S15 is the light source device with the second value of 0.5 Data S16 is the experimental result of the light source device with the second value of 0.6; Data S17 is the experimental result of the light source device with the second value of 0.7; Data S18 is the experimental result of the light source device with the second value of 0.8.

由圖3A的實驗結果可知，當第二數值落在0.5至1的範圍時黃光強度與藍光強度的比例分布較均勻，亦即數據S15、S16、S17、S18的數值分布都較數據S13、S14平緩，不會形成因黃光的比例過大而產生的色偏。It can be seen from the experimental results in FIG. 3A that when the second value falls within the range of 0.5 to 1, the ratio of the intensity of yellow light to the intensity of blue light is more uniform, that is, the numerical distribution of data S15, S16, S17, and S18 is higher than that of data S13, S14 is gentle and does not form color shift due to the excessive proportion of yellow light.

另一方面，圖3B是第一實驗範例的黃光、藍光的變異度沿著上述方向d1紀錄的實驗結果。請參照圖3B，橫座標的y值為出光面222S上沿著方向d1與光源裝置210(亦即入光端)間的距離(單位為公釐)；縱座標為黃光與藍光的變異度；實驗數據各自表示為：數據V13為第二數值為0.3的光源裝置的實驗結果；數據V14為第二數值為0.4的光源裝置的實驗結果；數據V15為第二數值為0.5的光源裝置的實驗結果；數據V16為第二數值為0.6的光源裝置的實驗結果；數據V17為第二數值為0.7的光源裝置的實驗結果；數據V18為第二數值為0.8的光源裝置的實驗結果。On the other hand, FIG. 3B is an experimental result recorded by the variation of yellow light and blue light of the first experimental example along the above-mentioned direction d1. Please refer to FIG. 3B, the y value of the abscissa is the distance between the light source device 222S along the direction d1 and the light source device 210 (that is, the light entrance end) (in mm); the ordinate is the variation of yellow light and blue light The experimental data are respectively expressed as: data V13 is the experimental result of the light source device with the second value of 0.3; data V14 is the experimental result of the light source device with the second value of 0.4; data V15 is the experiment of the light source device with the second value of 0.5 Results; Data V16 is the experimental result of the light source device with the second value of 0.6; Data V17 is the experimental result of the light source device with the second value of 0.7; Data V18 is the experimental result of the light source device with the second value of 0.8.

由圖3B的實驗結果可知，當第二數值落在0.5至1的範圍時(亦即數據V15、V16、V17、V18)，黃光強度與藍光強度的變異度落在範圍R1內，此範圍內的變異度的絕對值較低，不會形成因黃光的變異度過大而產生的黃帶及色偏。According to the experimental results in FIG. 3B, when the second value falls within the range of 0.5 to 1 (that is, data V15, V16, V17, V18), the variability of the yellow light intensity and the blue light intensity falls within the range R1. The absolute value of the internal variability is low, and no yellow band or color cast due to the excessive variation of yellow light will be formed.

本發明實施例的波長轉換層212和發光區211A在空間上分布的比例可以進一步搭配較薄的導光腔220，因此背光模組200可以提供良好的光源。背光模組200可以進一步符合以下規則：當第一數值沒有超過30毫米時，第二數值落在0.6至1的範圍；其中第一數值為寬度w3，第二數值為寬度w1和寬度w2的比值。藉由具有上述特徵的背光模組200，照明光L自出光面222S發出時形成的色偏或黃色光比例較高的黃帶亦可在較薄的背光模組200中解決，使顯示裝置100可以顯示良好的畫面。The spatial distribution ratio of thewavelength conversion layer 212 and the light-emittingarea 211A in the embodiment of the present invention can be further matched with the thinnerlight guide cavity 220, so thebacklight module 200 can provide a good light source. Thebacklight module 200 may further meet the following rules: when the first value does not exceed 30 mm, the second value falls within the range of 0.6 to 1; where the first value is the width w3, and the second value is the ratio of the width w1 and the width w2 . With thebacklight module 200 having the above-mentioned characteristics, the color shift or the yellow band with a higher proportion of yellow light formed when the illumination light L is emitted from the light emitting surface 222S can also be solved in thethinner backlight module 200, so that thedisplay device 100 Can display a good picture.

在一第二實驗範例中，上述背光模組200中反射面223S和出光面222S之間的第一數值為30毫米，並在此背光模組200中分別以第二數值為0.3、0.4、0.5、0.6、0.7及0.8的發光區211A以及波長轉換層212來測試，並沿著方向d1記錄黃光以及藍光在出光面222S的比例以及變異量。In a second experimental example, the first value between the reflective surface 223S and the light emitting surface 222S in thebacklight module 200 is 30 mm, and the second values in thebacklight module 200 are 0.3, 0.4, 0.5, respectively. , 0.6, 0.7, and 0.8 of the light-emittingregion 211A and thewavelength conversion layer 212 to test, and record the proportion of yellow light and blue light on the light exit surface 222S along the direction d1 and the amount of variation.

圖4A是第二實驗範例的黃光、藍光比例沿著上述方向d1記錄的實驗結果。請參照圖4A，橫座標的y值為出光面222S上沿著方向d1與光源裝置210(亦即入光端)之間的距離(單位為公釐)；縱座標為黃光強度對藍光強度的比例；實驗數據各自表示為：數據S23為第二數值為0.3的光源裝置的實驗結果；數據S24為第二數值為0.4的光源裝置的實驗結果；數據S25為第二數值為0.5的光源裝置的實驗結果；數據S26為第二數值為0.6的光源裝置的實驗結果；數據S27為第二數值為0.7的光源裝置的實驗結果；數據S28為第二數值為0.8的光源裝置的實驗結果。FIG. 4A is an experimental result of the ratio of yellow light to blue light recorded along the above-mentioned direction d1 in the second experimental example. Referring to FIG. 4A, the y value of the abscissa is the distance between the light source device 222S along the direction d1 and the light source device 210 (that is, the light entrance end) (unit is mm); the ordinate is the intensity of yellow light versus the intensity of blue light The experimental data are expressed as: data S23 is the experimental result of the light source device with the second value of 0.3; data S24 is the experimental result of the light source device with the second value of 0.4; data S25 is the light source device with the second value of 0.5 Data S26 is the experimental result of the light source device with the second value of 0.6; Data S27 is the experimental result of the light source device with the second value of 0.7; Data S28 is the experimental result of the light source device with the second value of 0.8.

由圖4A的實驗結果可知，當第二數值落在0.6至1的範圍時黃光強度與藍光強度的比例分布較均勻，亦即數據S26、S27、S28的數值分布都較數據S23、S24、S25平緩，不會形成因黃光的比例過大而產生的色偏。From the experimental results of FIG. 4A, it can be seen that when the second value falls within the range of 0.6 to 1, the distribution of the ratio of the intensity of yellow light to the intensity of blue light is more uniform, that is, the numerical distribution of data S26, S27, and S28 is higher than that of data S23, S24, S25 is gentle and will not cause color shift due to the excessive proportion of yellow light.

另一方面，圖4B是第二實驗範例的黃光、藍光的變異度沿著上述方向d1紀錄的實驗結果。請參照圖4B，橫座標的y值為出光面222S上沿著方向d1與光源裝置210(亦即入光端)間的距離(單位為公釐)；縱座標為黃光與藍光的變異度；實驗數據各自表示為：數據V23為第二數值為0.3的光源裝置的實驗結果；數據V24為第二數值為0.4的光源裝置的實驗結果；數據V25為第二數值為0.5的光源裝置的實驗結果；數據V26為第二數值為0.6的光源裝置的實驗結果；數據V27為第二數值為0.7的光源裝置的實驗結果；數據V28為第二數值為0.8的光源裝置的實驗結果。On the other hand, FIG. 4B is an experimental result recorded by the variation of yellow light and blue light of the second experimental example along the above-mentioned direction d1. Please refer to FIG. 4B, the y value of the abscissa is the distance between the light source device 222S along the direction d1 and the light source device 210 (that is, the light entrance end) (unit is mm); the ordinate is the variability of yellow light and blue light The experimental data are respectively expressed as: data V23 is the experimental result of the light source device with the second value of 0.3; data V24 is the experimental result of the light source device with the second value of 0.4; data V25 is the experiment of the light source device with the second value of 0.5 Results; Data V26 is the experimental result of the light source device with the second value of 0.6; Data V27 is the experimental result of the light source device with the second value of 0.7; Data V28 is the experimental result of the light source device with the second value of 0.8.

由圖4B的實驗結果可知，當第二數值落在0.6至1的範圍時(亦即數據V26、V27、V28)黃光強度與藍光強度的變異度落在範圍R2內，此範圍內的變異度的絕對值較低，不會形成因黃光的變異度過大而產生的黃帶及色偏。According to the experimental results in FIG. 4B, when the second value falls within the range of 0.6 to 1 (that is, data V26, V27, and V28), the variability of the yellow light intensity and the blue light intensity falls within the range R2, and the variation within this range The absolute value of the degree is low, and it will not form a yellow band and color shift due to the excessive variation of yellow light.

本發明實施例的波長轉換層212和發光區211A在空間上分布的比例可以進一步搭配更薄的導光腔220，因此背光模組200可以提供良好的光源。背光模組200可以進一步符合以下規則：當第一數值沒有超過20毫米時，第二數值落在0.7至1的範圍；其中第一數值為寬度w3，第二數值為寬度w1和寬度w2的比值。藉由具有上述特徵的背光模組200，照明光L自出光面222S發出時形成的色偏或黃色光比例較高的黃帶亦可在更薄的背光模組200中解決，使顯示裝置100可以顯示良好的畫面。The spatial distribution ratio of thewavelength conversion layer 212 and the light-emittingarea 211A in the embodiment of the present invention can be further matched with the thinnerlight guide cavity 220, so thebacklight module 200 can provide a good light source. Thebacklight module 200 may further meet the following rules: when the first value does not exceed 20 mm, the second value falls within the range of 0.7 to 1; where the first value is the width w3, and the second value is the ratio of the width w1 and the width w2 . With thebacklight module 200 having the above-mentioned characteristics, the color shift or the yellow band with a higher proportion of yellow light formed when the illumination light L is emitted from the light emitting surface 222S can also be solved in thethinner backlight module 200, so that thedisplay device 100 Can display a good picture.

在一第三實驗範例中，上述背光模組200中反射面223S和出光面222S之間的第一數值為20毫米，並在此背光模組200中分別以第二數值為0.3、0.4、0.5、0.6、0.7及0.8的發光區211A以及波長轉換層212來測試，並沿著方向d1記錄黃光以及藍光在出光面222S的比例以及變異量。In a third experimental example, the first value between the reflective surface 223S and the light emitting surface 222S in thebacklight module 200 is 20 mm, and the second value in thebacklight module 200 is 0.3, 0.4, 0.5, respectively , 0.6, 0.7, and 0.8 of the light-emittingregion 211A and thewavelength conversion layer 212 to test, and record the proportion and variation of yellow light and blue light on the light exit surface 222S along the direction d1.

圖5A是第三實驗範例的黃光、藍光比例沿著上述方向d1記錄的實驗結果。請參照圖5A，橫座標的y值為出光面222S上沿著方向d1與光源裝置210(亦即入光端)之間的距離(單位為公釐)；縱座標為黃光強度對藍光強度的比例；實驗數據各自表示為：數據S33為第二數值為0.3的光源裝置的實驗結果；數據S34為第二數值為0.4的光源裝置的實驗結果；數據S35為第二數值為0.5的光源裝置的實驗結果；數據S36為第二數值為0.6的光源裝置的實驗結果；數據S37為第二數值為0.7的光源裝置的實驗結果；數據S38為第二數值為0.8的光源裝置的實驗結果。FIG. 5A is an experimental result of the ratio of yellow light to blue light of the third experimental example recorded along the above-mentioned direction d1. Please refer to FIG. 5A, the y value of the abscissa is the distance between the light source device 222S along the direction d1 and the light source device 210 (that is, the light entrance end) (unit is mm); the ordinate is the intensity of yellow light to the intensity of blue light The proportion of the experimental data is expressed as follows: data S33 is the experimental result of the light source device with the second value of 0.3; data S34 is the experimental result of the light source device with the second value of 0.4; data S35 is the light source device with the second value of 0.5 Data S36 is the experimental result of the light source device with the second value of 0.6; Data S37 is the experimental result of the light source device with the second value of 0.7; Data S38 is the experimental result of the light source device with the second value of 0.8.

由圖5A的實驗結果可知，當第二數值落在0.7至1的範圍時黃光強度與藍光強度的比例分布較均勻，亦即數據S37、S38的數值分布都較數據S33、S34、S35、S36平緩，不會形成因黃光的比例過大而產生的色偏。From the experimental results of FIG. 5A, it can be seen that when the second value falls within the range of 0.7 to 1, the ratio of the distribution of the yellow light intensity and the blue light intensity is more uniform, that is, the data distribution of the data S37 and S38 are more than the data S33, S34, S35, S36 is gentle and does not form color shift due to the excessive proportion of yellow light.

另一方面，圖5B是第三實驗範例的黃光、藍光的變異度沿著上述方向d1紀錄的實驗結果。請參照圖5B，橫座標的y值為出光面222S上沿著方向d1與光源裝置210(亦即入光端)間的距離(單位為公釐)；縱座標為黃光與藍光的變異度；實驗數據各自表示為：數據V33為第二數值為0.3的光源裝置的實驗結果；數據V34為第二數值為0.4的光源裝置的實驗結果；數據V35為第二數值為0.5的光源裝置的實驗結果；數據V36為第二數值為0.6的光源裝置的實驗結果；數據V37為第二數值為0.7的光源裝置的實驗結果；數據V38為第二數值為0.8的光源裝置的實驗結果。On the other hand, FIG. 5B is an experimental result recorded by the variation of the yellow light and blue light of the third experimental example along the above-mentioned direction d1. Please refer to FIG. 5B, the y value of the abscissa is the distance between the light source device 222S along the direction d1 and the light source device 210 (that is, the light entrance end) (unit is mm); the ordinate is the variation of yellow light and blue light The experimental data are respectively expressed as: data V33 is the experimental result of the light source device with the second value of 0.3; data V34 is the experimental result of the light source device with the second value of 0.4; data V35 is the experiment of the light source device with the second value of 0.5 Results; Data V36 is the experimental result of the light source device with the second value of 0.6; Data V37 is the experimental result of the light source device with the second value of 0.7; Data V38 is the experimental result of the light source device with the second value of 0.8.

由圖5B的實驗結果可知，當第二數值落在0.7至1的範圍時(亦即數據S37、S38)黃光強度與藍光強度的變異度落在範圍R3內，此範圍內的變異度的絕對值較低，不會形成因黃光的變異度過大而產生的黃帶及色偏。From the experimental results of FIG. 5B, it can be seen that when the second value falls within the range of 0.7 to 1 (that is, data S37, S38), the variability of the yellow light intensity and the blue light intensity falls within the range R3, and the variability within this range The absolute value is low, and the yellow band and color shift caused by the excessive variation of yellow light will not be formed.

以下將進一步藉由色度圖來說明本發明的背光模組的效果。此處參考CIE 1931色彩空間來測試背光模組200在沿著方向d1上在出光面222S發出的光的顏色差異，並將這些光的顏色對應至CIE xy色度圖上的座標來表示。The effect of the backlight module of the present invention will be further explained by the chromaticity diagram below. Here, the color difference of the light emitted by thebacklight module 200 on the light exit surface 222S in the direction d1 is tested with reference to the CIE 1931 color space, and the color of the light is represented by the coordinates on the CIE xy chromaticity diagram.

以下以相同厚度(第一數值為30毫米)的導光腔220對多個市售的具有不同第二數值的發光二極體作為發光單元211的光源裝置210作測試。在一第五實驗範例中，背光模組200分別以第二數值為0.53、0.66以及0.89的光源裝置210作測試，其中第二數值為0.53的發光單元的參考型號為7016 PCT；第二數值為0.66的發光單元的參考型號為4014 EMC；第二數值為0.89的發光單元的參考型號為1313 CSP。In the following, a plurality of commercially availablelight source devices 210 having light emitting diodes with different second values as thelight emitting unit 211 are tested with thelight guide cavity 220 of the same thickness (the first value is 30 mm). In a fifth experimental example, thebacklight module 200 was tested withlight source devices 210 with second values of 0.53, 0.66, and 0.89, respectively. The reference model of the light-emitting unit with the second value of 0.53 was 7016 PCT; the second value was The reference model of the light-emitting unit of 0.66 is 4014 EMC; the reference model of the light-emitting unit with the second value of 0.89 is 1313 CSP.

圖6A是第四實驗範例的光顏色在CIE xy色度圖中x座標的分布，其中數據Cx3為第二數值為0.53的光源裝置的實驗結果，數據Cx4為第二數值為0.66的光源裝置的實驗結果，數據Cx5為第二數值為0.89的光源裝置的實驗結果；圖6B是第四實驗範例的光顏色在CIE xy色度圖中y座標的分布，其中數據Cy3為第二數值為0.53的光源裝置的實驗結果，數據Cy4為第二數值為0.66的光源裝置的實驗結果，其中數據Cy6為第二數值為0.89的光源裝置的實驗結果。6A is the distribution of the x-coordinates of the light color in the CIE xy chromaticity diagram of the fourth experimental example, where the data Cx3 is the experimental result of the light source device with the second value of 0.53, and the data Cx4 is the light source device with the second value of 0.66 Experimental results, the data Cx5 is the experimental result of the light source device with the second value of 0.89; FIG. 6B is the distribution of the y coordinate of the light color of the fourth experimental example in the CIE xy chromaticity diagram, where the data Cy3 is the second value of 0.53 The experimental result of the light source device, the data Cy4 is the experimental result of the light source device with the second value of 0.66, wherein the data Cy6 is the experimental result of the light source device with the second value of 0.89.

由圖6A及6B可以看出，當背光模組符合規則：當第一數值沒有超過40毫米時，第二數值落在0.5至1的範圍；且進一步符合：當第一數值沒有超過30毫米時，第二數值落在0.6至1的範圍；數據Cx4、Cx5的變化量比數據Cx3低，數據Cy4、Cy5的變化量比數據Cy3低，則背光模組200在出光面222S上的光的色偏現象可以降低。As can be seen from FIGS. 6A and 6B, when the backlight module meets the rules: when the first value does not exceed 40 mm, the second value falls within the range of 0.5 to 1; and further conforms to: when the first value does not exceed 30 mm , The second value falls in the range of 0.6 to 1; the amount of change of data Cx4 and Cx5 is lower than that of data Cx3, and the amount of change of data Cy4 and Cy5 is lower than that of data Cy3, then the color of the light on the light emitting surface 222S of thebacklight module 200 Partial phenomena can be reduced.

綜上所述，本發明實施例的背光模組的厚度可以與發光區以及波長轉換層在空間上的分布比例作搭配，藉由提供均勻的照明光的光源裝置來改善背光模組作為背光光源的品質，解決色偏以及黃帶的問題。In summary, the thickness of the backlight module of the embodiment of the present invention can be matched with the spatial distribution ratio of the light-emitting area and the wavelength conversion layer, and the backlight module can be improved as a backlight light source by providing a light source device with uniform illumination light The quality of the solution solves the problem of color cast and yellow belt.