TWI408592B

Movatterモバイル変換

Info

Publication number: TWI408592B
Application number: TW99102933A
Authority: TW
Inventors: Song-Ling Yang
Original assignee: Hon Hai Prec Ind Co Ltd
Priority date: 2010-02-02
Filing date: 2010-02-02
Publication date: 2013-09-11
Also published as: TW201128494A

Abstract

A touch pad is disclosed. The touch pad includes a plurality of independent touch control cells. Each touch control cell includes upper electrode, lower electrode, LCD cell and color display cell. A high-frequency current oscillator is connected to the upper electrode. The touch pad also includes a plurality of rectification circuits, a plurality of switches, and a plurality of comparator. Each rectification circuit is connected to the down electrode of the touch control cell correspondingly. Each switche is located in a circuit that is formed by the upper electrode, lower electrode of a touch control cell, and a DC power. Each comparator is connected to a rectification circuit, each comparator includes a input port connected to the rectification circuit, an output port connected to a control terminal of the switch.

Description

Translated fromChinese

觸控板以及使用該觸控板的電子裝置Touchpad and electronic device using the same

本發明涉及一種觸控板，及使用該觸控板的電子裝置。The invention relates to a touch panel and an electronic device using the touch panel.

當今，手寫輸入已經大量的運用在消費性電子產品中，如手機，手寫板等。但是傳統實現手寫輸入是通過觸摸面板偵測用戶的觸摸產生觸摸信號，處理器根據觸摸信號判斷出觸摸點位置後，再控制顯示裝置對應該觸摸點位置部位的顯示發生改變，從而實現手寫功能。然而，傳統的手寫輸入，通過處理器的資料處理後再控制顯示，回應時間較長。Today, handwriting input has been heavily used in consumer electronics such as cell phones and tablets. However, the traditional implementation of handwriting input is to generate a touch signal by detecting the touch of the user through the touch panel, and the processor determines the position of the touched point according to the touch signal, and then controls the display device to change the display of the position of the touched point, thereby implementing the handwriting function. However, the traditional handwriting input is controlled by the processor's data processing, and the response time is longer.

有鑒於此，有必要提供一種觸控板，利用該觸控板能快速的顯示出觸摸位置的觸摸痕跡，解決了現有技術的不足。In view of the above, it is necessary to provide a touch panel, which can quickly display the touch trace of the touch position, and solves the deficiencies of the prior art.

一種觸控板，包括若干獨立的觸控單元，每個觸控單元均包括上電極、下電極、液晶單元和顯色單元，該液晶單元位於該上電極和該下電極之間，該顯色單元位於該下電極底部。高頻電流振蕩器，與每一觸控單元的上電極均連接，用於輸出一高頻電流至該些上電極。若干整流電路，該些整流電路與該些觸控單元一一對應，每一整流電路與對應的觸控單元的下電極連接，用於將下電極輸出的高頻電流轉換成直流。若干開關，與該些觸控單元一一對應，每一開關位於對應的觸控單元的上下電極與一直流電源所構成的回路中。若干比較器，與該些觸控單元一一對應，每一比較器均包括一輸入端與對應的整流電路連接，並包括一輸出端與對應的開關的控制端連接。其中，當人體觸摸該觸控板時，從該觸摸位置對應的觸控單元的下電極流出的高頻電流減小，該整流電路轉換的直流也相應減小，該比較器比較該電流小於一預定值時，控制對應的開關導通，從而直流電源對該對應的觸控單元的上下電極施加電壓控制液晶單元的導通，而顯示顯色單元的顏色。A touch panel includes a plurality of independent touch units, each touch unit includes an upper electrode, a lower electrode, a liquid crystal unit, and a color developing unit. The liquid crystal unit is located between the upper electrode and the lower electrode, and the color is developed. The unit is located at the bottom of the lower electrode. The high frequency current oscillator is connected to the upper electrode of each touch unit for outputting a high frequency current to the upper electrodes. a plurality of rectifying circuits, wherein the rectifying circuits are in one-to-one correspondence with the touch units, and each rectifying circuit is connected to a lower electrode of the corresponding touch unit for powering offThe high frequency current of the pole output is converted to DC. The switches are in one-to-one correspondence with the touch units, and each switch is located in a loop formed by the upper and lower electrodes of the corresponding touch unit and the DC power source. The plurality of comparators are in one-to-one correspondence with the touch units, and each of the comparators includes an input end connected to the corresponding rectifier circuit, and an output end is connected to the control end of the corresponding switch. When the human body touches the touch panel, the high-frequency current flowing from the lower electrode of the touch unit corresponding to the touch position is reduced, and the DC converted by the rectifier circuit is correspondingly reduced, and the comparator compares the current to less than one. When the predetermined value is used, the corresponding switch is controlled to be turned on, so that the DC power source applies a voltage to the upper and lower electrodes of the corresponding touch unit to control the conduction of the liquid crystal unit, and displays the color of the color developing unit.

一種電子裝置，包括一觸控板，其包括若干獨立的觸控單元，每個觸控單元均包括上電極、下電極、液晶單元和顯色單元，該液晶單元位於該上電極和該下電極之間，該顯色單元位於該下電極底部。高頻電流振蕩器，與每一觸控單元的上電極均連接，用於輸出一高頻電流至該些上電極。若干整流電路，該些整流電路與該些觸控單元一一對應，每一整流電路與對應的觸控單元的下電極連接，用於將下電極輸出的高頻電流轉換成直流。若干開關，與該些觸控單元一一對應，每一開關位於對應的觸控單元的上下電極與一直流電源所構成的回路中。若干比較器，與該些觸控單元一一對應，每一比較器均包括一輸入端與對應的整流電路連接，並包括一輸出端與對應的開關的控制端連接。其中，當人體觸摸該觸控板時，從該觸摸位置對應的觸控單元的下電極流出的高頻電流減小，該整流電路轉換的直流也相應減小，該比較器比較該電流小於一預定值時，控制對應的開關導通，從而直流電源對該對應的觸控單元的上下電極施加電壓控制液晶單元的導通，而顯示顯色單元的顏色。An electronic device includes a touch panel including a plurality of independent touch units, each touch unit includes an upper electrode, a lower electrode, a liquid crystal unit, and a color developing unit, wherein the liquid crystal unit is located at the upper electrode and the lower electrode The color developing unit is located at the bottom of the lower electrode. The high frequency current oscillator is connected to the upper electrode of each touch unit for outputting a high frequency current to the upper electrodes. And a plurality of rectifying circuits, wherein the rectifying circuits are in one-to-one correspondence with the touch units, and each of the rectifying circuits is connected to a lower electrode of the corresponding touch unit for converting the high-frequency current outputted by the lower electrode into a direct current. The switches are in one-to-one correspondence with the touch units, and each switch is located in a loop formed by the upper and lower electrodes of the corresponding touch unit and the DC power source. The plurality of comparators are in one-to-one correspondence with the touch units, and each of the comparators includes an input end connected to the corresponding rectifier circuit, and an output end is connected to the control end of the corresponding switch. When the human body touches the touch panel, the high-frequency current flowing from the lower electrode of the touch unit corresponding to the touch position is reduced, and the DC converted by the rectifier circuit is correspondingly reduced, and the comparator is compared.When the current is less than a predetermined value, the corresponding switch is controlled to be turned on, so that the DC power source applies a voltage to the upper and lower electrodes of the corresponding touch unit to control the conduction of the liquid crystal unit, and displays the color of the color developing unit.

當人體觸摸該觸控板時，人體帶走一部分電流，該比較器比較經過上電極和下電極的電流的變化來控制該開關導通，從而控制液晶單元的導通，此時對應的觸摸位置顯出觸摸痕跡。When the human body touches the touch panel, the human body takes away a part of the current, and the comparator controls the switch to conduct according to the change of the current passing through the upper electrode and the lower electrode, thereby controlling the conduction of the liquid crystal unit, and the corresponding touch position is displayed at this time. Touch the traces.

10‧‧‧觸控板10‧‧‧ Trackpad

11‧‧‧觸控單元11‧‧‧Touch unit

12‧‧‧上電極12‧‧‧Upper electrode

13‧‧‧下電極13‧‧‧ lower electrode

14‧‧‧液晶單元14‧‧‧Liquid Crystal Unit

15‧‧‧顯色單元15‧‧‧Color unit

16‧‧‧高頻電流振蕩器16‧‧‧High frequency current oscillator

17‧‧‧保護層17‧‧‧Protective layer

18‧‧‧整流電路18‧‧‧Rectifier circuit

19‧‧‧開關19‧‧‧ switch

20‧‧‧直流電源20‧‧‧DC power supply

21‧‧‧比較器21‧‧‧ Comparator

191‧‧‧控制端191‧‧‧Control end

211‧‧‧輸入端211‧‧‧ input

212‧‧‧輸出端212‧‧‧output

213‧‧‧參考電流端213‧‧‧Reference current end

i‧‧‧高頻電流i‧‧‧High frequency current

i_REF‧‧‧參考電流i_REF ‧‧‧reference current

i1‧‧‧部分高頻電流I1‧‧‧ part of high frequency current

i2‧‧‧流出的高頻電流High frequency current flowing out of i2‧‧‧

圖1係本發明的一實施方式中的觸控板結構示意圖。1 is a schematic structural view of a touch panel in an embodiment of the present invention.

圖2係本發明的一實施方式中的觸控板的俯視圖。2 is a plan view of a touch panel in an embodiment of the present invention.

請參閱圖1及圖2，觸控板10包括多個獨立的觸控單元11，每個觸控單元11包括上電極12、下電極13、液晶單元14和顯色單元15，液晶單元14位於上電極12和下電極13之間，顯色單元15位於下電極13底部，上電極12和下電極13在本實施方式中為透明電極，顯色單元15為背光板。Referring to FIG. 1 and FIG. 2 , the touch panel 10 includes a plurality of independent touch units 11 . Each touch unit 11 includes an upper electrode 12 , a lower electrode 13 , a liquid crystal unit 14 , and a color developing unit 15 . Between the upper electrode 12 and the lower electrode 13, the color developing unit 15 is located at the bottom of the lower electrode 13, the upper electrode 12 and the lower electrode 13 are transparent electrodes in the present embodiment, and the color developing unit 15 is a backlight.

觸控板10還包括高頻電流振蕩器16，高頻電流振蕩器16與每一觸控單元11的上電極12均連接，用於輸出一高頻電流i至該些上電極12。在本實施方式中，每一觸控單元11的上電極12和下電極13構成一電容器，由電容器通交流隔直流的特性可知，高頻電流振蕩器16產生的高頻電流i流至該些上電極12後分別從對應的下電極13流出。在本實施方式中，觸控板10還包括一保護層17，保護層17位於觸控板10的表面，其設置於上電極12的頂部，用於防止劃傷觸控板10，保護層17由導電材料製成。The touch panel 10 further includes a high frequency current oscillator 16 connected to the upper electrode 12 of each touch unit 11 for outputting a high frequency current i to the upper electrodes 12. In the present embodiment, the upper electrode 12 and the lower electrode 13 of each touch unit 11 constitute a capacitor, and the high-frequency current i generated by the high-frequency current oscillator 16 flows to the capacitors. The upper electrode 12 then flows out from the corresponding lower electrode 13, respectively. In the present embodiment, the touch panel 10 further includes a protective layer 17 on the surface of the touch panel 10 disposed on the top of the upper electrode 12 for preventing scratching of the touch panel 10 and the protective layer 17 Made of a conductive material.

觸控板10還包括若干整流電路18，該些整流電路18與該些觸控單元11一一對應，每一整流電路18與對應的觸控單元11的下電極13連接，用於將下電極13輸出的高頻電流i轉換成直流。The touch panel 10 further includes a plurality of rectifying circuits 18, and the rectifying circuits 18 are in one-to-one correspondence with the touch units 11. Each rectifying circuit 18 is connected to the lower electrode 13 of the corresponding touch unit 11 for lower electrodes. The output high frequency current i of 13 is converted into direct current.

觸控板10還包括若干開關19，與該些觸控單元11一一對應，每一開關19位於對應的觸控單元11的上電極12、下電極13與直流電源20所構成的回路中。每一開關19包括一控制端191，用於控制開關19的導通和斷開。在本實施方式中，開關19位於下電極13與直流電源20的一端之間，在其他實施方式中，開關19位於上電極12與直流電源20的一端之間。The touch panel 10 further includes a plurality of switches 19 corresponding to the touch units 11 . Each switch 19 is located in a loop formed by the upper electrode 12 , the lower electrode 13 , and the DC power source 20 of the corresponding touch unit 11 . Each switch 19 includes a control terminal 191 for controlling the conduction and disconnection of the switch 19. In the present embodiment, the switch 19 is located between the lower electrode 13 and one end of the DC power source 20. In other embodiments, the switch 19 is located between the upper electrode 12 and one end of the DC power source 20.

觸控板10還包括若干比較器21，與該些觸控單元11一一對應，每一比較器21均包括一輸入端211與對應的整流電路18連接，比較器21還包括一輸出端212與對應的開關19的控制端191連接。在本實施方式中，比較器21還包括一參考電流端213，參考電流端213用於接入一參考電流iREF，參考電流iREF的大小等於高頻電流振蕩器16輸出至觸控單元11上電極12的電流，比較器21用於比較整流電路18輸出的電流與參考電流iREF的大小，當整流電路18輸出的電流小於參考電流iREF時，比較器21向開關19的控制端191輸出一導通控制信號，控制開關19的導通。The touch panel 10 further includes a plurality of comparators 21 corresponding to the touch units 11 . Each of the comparators 21 includes an input end 211 connected to the corresponding rectifier circuit 18 , and the comparator 21 further includes an output end 212 . It is connected to the control terminal 191 of the corresponding switch 19. In the present embodiment, the comparator 21 further includes a reference current terminal 213 for accessing a reference current iREF. The magnitude of the reference current iREF is equal to the output of the high frequency current oscillator 16 to the upper electrode of the touch unit 11. The current of 12 is used to compare the current output by the rectifier circuit 18 with the magnitude of the reference current iREF. When the current output by the rectifier circuit 18 is less than the reference current iREF, the comparator 21 outputs a conduction control to the control terminal 191 of the switch 19. The signal controls the conduction of the switch 19.

當人體沒有觸摸觸控板10時，通過整流電路18的電流和參考電流iREF相等，經比較器21的比較後，比較器21輸出端212向對應的開關19的控制端191發送一控制信號使開關19處於斷開狀態，此時上電極12和下電極13之間的電壓為0，在該電壓下液晶單元14中的液晶分子處於無規則狀態，顯色單元15的光線無法透過液晶單元14，觸控板10顯出的顏色為液晶單元14的顏色。When the human body does not touch the touch panel 10, the current through the rectifying circuit 18 is equal to the reference current iREF. After comparison by the comparator 21, the output terminal 212 of the comparator 21 sends a control signal to the control terminal 191 of the corresponding switch 19. The switch 19 is in an off state, at which time the voltage between the upper electrode 12 and the lower electrode 13 is 0, at which the liquid crystal molecules in the liquid crystal cell 14 are in an irregular state, and the light of the color developing unit 15 cannot pass through the liquid crystal.The color displayed by the touch panel 10 of the unit 14 is the color of the liquid crystal unit 14.

當人體觸摸觸控板10時，人體帶走一部分高頻電流i1，從該觸摸位置對應的觸控單元11的下電極13流出的高頻電流i2減小，整流電路18轉換的直流也相應減小，比較器21比較該電流小於該參考電流iREF時，比較器21的輸出端212向對應的開關19的控制端191發送一控制信號使開關19處於導通狀態，從而使上電極12、下電極13、直流電源20以及開關19構成一個回路，直流電源20對與其對應的上電極12和下電極13施加電壓，從而控制液晶單元14導通，顯色單元15的光線從液晶單元14中間穿過，從而使得與液晶單元14相對應的觸摸位置發射出該光線，從而顯示觸摸軌跡。When the human body touches the touch panel 10, the human body carries away a part of the high-frequency current i1, and the high-frequency current i2 flowing out from the lower electrode 13 of the touch unit 11 corresponding to the touch position is reduced, and the DC converted by the rectifier circuit 18 is correspondingly reduced. When the comparator 21 compares the current to the reference current iREF, the output terminal 212 of the comparator 21 sends a control signal to the control terminal 191 of the corresponding switch 19 to turn the switch 19 into an on state, thereby causing the upper electrode 12 and the lower electrode. 13. The DC power source 20 and the switch 19 form a loop, and the DC power source 20 applies a voltage to the corresponding upper electrode 12 and lower electrode 13 to control the liquid crystal unit 14 to be turned on, and the light of the color developing unit 15 passes through the middle of the liquid crystal unit 14. Thereby, the light position corresponding to the liquid crystal unit 14 is emitted to emit the light, thereby displaying the touch track.

在其他實施方式中，顯色單元15可為一帶色的反光板，當人體觸摸觸控板10時，液晶單元14導通，則顯示該反光板的顏色，從而顯示觸摸軌跡。In other embodiments, the color developing unit 15 can be a colored reflective plate. When the human body touches the touch panel 10, the liquid crystal unit 14 is turned on, and the color of the reflective plate is displayed to display the touch track.

本發明的觸控板10可安裝於手機、電子相框等電子裝置上，實現即寫即現的功能。The touch panel 10 of the present invention can be installed on an electronic device such as a mobile phone or an electronic photo frame to realize the function of writing and writing.

請參閱圖2，為本發明第一實施方式中觸控單元的排布圖。該觸控單元11以矩陣方式排列，觸控單元11的個數可根據手寫觸摸輸入的精度要求進行設置，如前所述，只要用戶一觸摸觸控單元11，對應的觸控單元11即顯示一顏色，從而隨著用戶的觸摸移動，在用戶觸摸過的位置均會顯示出一顏色，從而顯示出觸摸軌跡，實現手寫輸入。Please refer to FIG. 2 , which is a layout diagram of a touch unit according to a first embodiment of the present invention. The touch unit 11 is arranged in a matrix manner, and the number of the touch units 11 can be set according to the accuracy requirement of the handwriting touch input. As described above, as long as the user touches the touch unit 11, the corresponding touch unit 11 displays A color, so that as the user's touch moves, a color is displayed at a position touched by the user, thereby displaying a touch trajectory and realizing handwriting input.