TWI507946B - Touch sensing panel and sensing circuit therein - Google Patents
Touch sensing panel and sensing circuit therein Download PDFInfo
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Description
本發明內容是有關於一種觸控感應面板,且特別是有關於一種觸控感應面板中之感應電路。The present invention relates to a touch sensing panel, and more particularly to a sensing circuit in a touch sensing panel.
一般而言,以光感式觸控顯示器來說,其主要是利用其中光感應器依據不同照光強度產生相應的感應電流,並以不同感應電流間的大小差異作為其中光感應器感受光強弱之依據,進而作觸控的判斷。舉例來說,光感應器在手指觸碰、環境光照射以及光筆觸控的情形下,會分別相應產生不同的感應電流,而當光感應器接受的光強度較大時,感應電流亦隨之增大,且不同感應電流間可經由積分器電路轉為輸出電壓,藉此供判斷是否有觸控操作。Generally speaking, in the case of a light-sensitive touch display, the light sensor is mainly used to generate a corresponding induced current according to different illumination intensity, and the difference in magnitude between different induced currents is used as the light intensity of the light sensor. Based on the judgment of the touch. For example, in the case of a finger touch, ambient light illumination, and light pen touch, the light sensor respectively generates different induced currents, and when the light intensity received by the light sensor is large, the induced current also follows. Increased, and different inductive currents can be converted to output voltages via the integrator circuit, thereby determining whether there is a touch operation.
然而,於觸控顯示面板中,觸控感應電路所接收的重置電位會因面板內的電阻電容負載(RC loading)效應而有所差異,因而讓位於信號傳送路徑的末端的重置電位和位於信號傳送路徑前端的重置電位所具有的準位不同,使得當重置電位施加於觸控感應電路且後續輸出電壓產生 時,在信號傳送路徑前端的輸出電壓會大於在信號傳送路徑末端的輸出電壓,造成觸控操作誤判的情形發生。However, in the touch display panel, the reset potential received by the touch sensing circuit is different due to the RC loading effect in the panel, thereby giving a reset potential at the end of the signal transmission path. And the reset potential at the front end of the signal transmission path has a different level, so that when the reset potential is applied to the touch sensing circuit and the subsequent output voltage is generated When the output voltage at the front end of the signal transmission path is greater than the output voltage at the end of the signal transmission path, a situation in which the touch operation is misjudged occurs.
本發明內容是關於一種觸控感應面板及其中之感應電路,藉此改善觸控操作誤判的情形發生。The present invention relates to a touch sensing panel and a sensing circuit therefor, thereby improving the occurrence of a misjudgment of the touch operation.
本發明內容之一實施態樣係關於一種感應電路,其包含儲能單元、光感測單元以及充電單元。光感測單元電性耦接於儲能單元,用以感測一第一顏色光,並依據所感測之第一顏色光的強度呈現相應的導通狀態以控制儲能單元的放電,且用以依據一控制信號導通而對儲能單元進行重置。充電單元電性耦接於儲能單元,並於儲能單元重置之過程中對儲能單元進行充電。One aspect of the present invention is directed to an inductive circuit that includes an energy storage unit, a light sensing unit, and a charging unit. The light sensing unit is electrically coupled to the energy storage unit for sensing a first color light, and displaying a corresponding conduction state according to the sensed intensity of the first color light to control discharge of the energy storage unit, and The energy storage unit is reset according to a control signal being turned on. The charging unit is electrically coupled to the energy storage unit and charges the energy storage unit during the resetting of the energy storage unit.
在本發明一實施例中,充電單元係由儲能單元儲存之電壓所控制以選擇性地對儲能單元進行充電。In an embodiment of the invention, the charging unit is controlled by a voltage stored by the energy storage unit to selectively charge the energy storage unit.
在本發明另一實施例中,儲能單元更包含電容元件,充電單元更包含至少一開關元件,開關元件用以依據電容元件所儲存之電壓導通電容元件與一供應電壓。In another embodiment of the present invention, the energy storage unit further includes a capacitor element, and the charging unit further includes at least one switching element, wherein the switching element is configured to conduct the capacitor element and a supply voltage according to the voltage stored by the capacitor element.
在本發明次一實施例中,充電單元更包含至少一光感測元件,其用以感測一第二顏色光,並於光感測單元依據第二顏色光產生漏電流的情形下依據第二顏色光的強度產生相應之補償電流。In a second embodiment of the present invention, the charging unit further includes at least one light sensing component for sensing a second color light, and the light sensing unit generates a leakage current according to the second color light. The intensity of the two color lights produces a corresponding compensation current.
本發明內容之另一實施態樣係關於一種觸控感應面板,其包含複數個感應電路,且前述感應電路中每一者 包含電容元件、光電晶體以及充電單元。光電晶體電性耦接電容元件於一操作節點,用以感測一第一顏色光的強度而呈現相應的導通狀態,使得電容元件透過光電晶體進行放電,其中光電晶體係由一控制信號所控制而導通,使得電容元件透過光電晶體進行重置。充電單元電性耦接電容元件於操作節點,並於電容元件重置之過程中導通電容元件與一供應電壓。Another aspect of the present disclosure is directed to a touch sensing panel including a plurality of sensing circuits, and each of the foregoing sensing circuits Contains capacitive elements, optoelectronic crystals, and charging cells. The photoelectric crystal is electrically coupled to the capacitor element at an operation node for sensing the intensity of a first color light and exhibiting a corresponding conduction state, so that the capacitor element is discharged through the photoelectric crystal, wherein the photoelectric crystal system is controlled by a control signal Turning on, the capacitive element is reset through the photoelectric crystal. The charging unit is electrically coupled to the capacitive element at the operating node, and turns on the capacitive element and a supply voltage during the resetting of the capacitive element.
在本發明一實施例中,充電單元更包含開關元件,其具有一控制端、一第一端和一第二端,其中控制端和第二端電性耦接電容元件於操作節點,第一端用以電性耦接供應電壓。In an embodiment of the invention, the charging unit further includes a switching component having a control end, a first end, and a second end, wherein the control end and the second end are electrically coupled to the capacitive element at the operating node, first The terminal is used to electrically couple the supply voltage.
在本發明另一實施例中,充電單元更包含第一開關元件以及第二開關元件。第一開關元件具有一控制端、一第一端和一第二端,其中控制端電性耦接電容元件於操作節點,第一端用以電性耦接供應電壓。第二開關元件具有一控制端、一第一端和一第二端,其中控制端和第二端電性耦接電容元件於操作節點,第一端電性耦接第一開關元件之第二端。In another embodiment of the invention, the charging unit further includes a first switching element and a second switching element. The first switching element has a control end, a first end and a second end, wherein the control end is electrically coupled to the capacitive element at the operating node, and the first end is configured to electrically couple the supply voltage. The second switching element has a control end, a first end and a second end, wherein the control end and the second end are electrically coupled to the capacitive element at the operating node, and the first end is electrically coupled to the second end of the first switching element end.
在本發明次一實施例中,充電單元更包含第一開關元件以及第二開關元件。第一開關元件具有一控制端、一第一端和一第二端,其中控制端電性耦接電容元件於操作節點,第一端用以電性耦接供應電壓。第二開關元件具有一控制端、一第一端和一第二端,其中控制端和第一端電性耦接第一開關元件之第二端,第二端電性耦接電容元件 於操作節點。In a second embodiment of the present invention, the charging unit further includes a first switching element and a second switching element. The first switching element has a control end, a first end and a second end, wherein the control end is electrically coupled to the capacitive element at the operating node, and the first end is configured to electrically couple the supply voltage. The second switching element has a control end, a first end and a second end, wherein the control end and the first end are electrically coupled to the second end of the first switching element, and the second end is electrically coupled to the capacitive element On the operation node.
在本發明又一實施例中,觸控感應面板更包含彩色濾光片,彩色濾光片包含複數個色阻,其中色阻更包含具一第一顏色之一第一色阻以及具一第二顏色之一第二色阻,第一色阻相對應光電晶體配置,第二色阻相對應充電單元配置。In another embodiment of the present invention, the touch sensing panel further includes a color filter, the color filter includes a plurality of color resists, wherein the color resist further comprises a first color resist having a first color and a first color One of the two colors is a second color resist, the first color resist corresponds to the photonic crystal configuration, and the second color resist corresponds to the charging unit configuration.
在本發明再一實施例中,觸控感應面板更包含彩色濾光片,彩色濾光片包含複數個色阻,其中色阻更包含一第一色阻以及一第二色阻,第一色阻相對應光電晶體配置,第二色阻相對應充電單元配置。充電單元更包含至少一光感測元件,其光感測元件用以透過第二色阻感測一第二顏色光而產生相應之補償電流,以補償光電晶體透過第一色阻依據第二顏色光所產生之漏電流。In another embodiment of the present invention, the touch sensing panel further includes a color filter, the color filter includes a plurality of color resists, wherein the color resist further comprises a first color resist and a second color resist, the first color The resistance corresponds to the configuration of the photoelectric crystal, and the second color resistance corresponds to the configuration of the charging unit. The charging unit further includes at least one light sensing component, wherein the light sensing component senses a second color light through the second color resist to generate a corresponding compensation current to compensate the photoelectric crystal to pass the first color resist according to the second color Leakage current generated by light.
由上述可知,應用前述本發明之實施例可以有效地改善因電阻電容負載(RC loading)效應而導致感應輸出信號有誤的情形,進而防止觸控操作誤判的情形發生,而且更可以改善特定色阻與不同顏色光筆的光搭配操作而產生漏電流的問題,避免影響正常觸控信號的產生。It can be seen from the above that the application of the foregoing embodiments of the present invention can effectively improve the situation that the induced output signal is incorrect due to the RC loading effect, thereby preventing the occurrence of misjudgment of the touch operation and improving the specific color. The problem of leakage current is prevented by the operation of the light of different color light pens, so as to avoid affecting the generation of normal touch signals.
本發明內容旨在提供本揭示內容的簡化摘要,以使閱讀者對本揭示內容具備基本的理解。此發明內容並非本揭示內容的完整概述,且其用意並非在指出本發明實施例的重要(或關鍵)元件或界定本發明的範圍。This summary is intended to provide a simplified summary of the disclosure This Summary is not an extensive overview of the disclosure, and is intended to be illustrative of the embodiments of the invention.
100‧‧‧觸控感應面板100‧‧‧ touch sensor panel
110‧‧‧閘極驅動器110‧‧‧gate driver
120、120a~120g‧‧‧感應電路120, 120a~120g‧‧‧Induction circuit
210、210a‧‧‧儲能單元210, 210a‧‧‧ energy storage unit
220、220a‧‧‧光感測單元220, 220a‧‧‧Light sensing unit
230、230a~230c‧‧‧充電單元230, 230a~230c‧‧‧Charging unit
第1圖是依照本發明實施例繪示一種觸控感應面板的示意圖;第2圖是依照本發明實施例繪示一種如第1圖所示觸控感應面板中之感應電路的電路方塊示意圖;第3圖是依照本發明第一實施例繪示一種如第2圖所示之感應電路的電路示意圖;第4圖是依照本發明第二實施例繪示一種如第2圖所示之感應電路的電路示意圖;第5圖是依照本發明第三實施例繪示一種如第2圖所示之感應電路的電路示意圖;第6圖是繪示一種LED光筆與色阻的頻譜比較示意圖;第7圖是依照本發明第四實施例繪示一種如第2圖所示之感應電路的電路示意圖;第8圖是依照本發明第五實施例繪示一種如第2圖所示之感應電路的電路示意圖;第9圖是依照本發明第六實施例繪示一種如第2圖所示之感應電路的電路示意圖;以及第10圖是依照本發明第七實施例繪示一種如第2圖所示之感應電路的電路示意圖。1 is a schematic diagram of a touch sensing panel according to an embodiment of the invention; FIG. 2 is a block diagram showing a circuit of a sensing circuit in the touch sensing panel according to the first embodiment of the present invention; 3 is a circuit diagram of a sensing circuit as shown in FIG. 2 according to a first embodiment of the present invention; and FIG. 4 is a schematic circuit diagram shown in FIG. 2 according to a second embodiment of the present invention. FIG. 5 is a schematic circuit diagram of a sensing circuit as shown in FIG. 2 according to a third embodiment of the present invention; FIG. 6 is a schematic diagram showing a comparison of spectrum of an LED light pen and color resistance; FIG. 8 is a circuit diagram of a sensing circuit as shown in FIG. 2 according to a fourth embodiment of the present invention; FIG. 8 is a circuit diagram of a sensing circuit as shown in FIG. 2 according to a fifth embodiment of the present invention; FIG. 9 is a circuit diagram of a sensing circuit as shown in FIG. 2 according to a sixth embodiment of the present invention; and FIG. 10 is a diagram showing a second embodiment according to the seventh embodiment of the present invention. Circuit diagram of the sensing circuit Figure.
下文係舉實施例配合所附圖式作詳細說明,但所提 供之實施例並非用以限制本發明所涵蓋的範圍,而結構運作之描述非用以限制其執行之順序,任何由元件重新組合之結構,所產生具有均等功效的裝置,皆為本發明所涵蓋的範圍。此外,圖式僅以說明為目的,並未依照原尺寸作圖。為使便於理解,下述說明中相同元件將以相同之符號標示來說明。The following is a detailed description of the embodiments with reference to the drawings, but The embodiments are not intended to limit the scope of the present invention, and the description of the operation of the structure is not intended to limit the order of execution thereof. Any device that is recombined by components and produces equal devices is the present invention. The scope covered. In addition, the drawings are for illustrative purposes only and are not drawn to the original dimensions. For ease of understanding, the same elements in the following description will be denoted by the same reference numerals.
在全篇說明書與申請專利範圍所使用之用詞(terms),除有特別註明外,通常具有每個用詞使用在此領域中、在此揭露之內容中與特殊內容中的平常意義。某些用以描述本揭露之用詞將於下或在此說明書的別處討論,以提供本領域技術人員在有關本揭露之描述上額外的引導。The terms used in the entire specification and the scope of the patent application, unless otherwise specified, generally have the ordinary meaning of each term used in the field, the content disclosed herein, and the particular content. Certain terms used to describe the disclosure are discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in the description of the disclosure.
關於本文中所使用之『約』、『大約』或『大致』一般通常係指數值之誤差或範圍於百分之二十以內,較好地是於百分之十以內,而更佳地則是於百分之五以內。文中若無明確說明,其所提及的數值皆視作為近似值,例如可如『約』、『大約』或『大致』所表示的誤差或範圍,或其他近似值。As used herein, "about", "about" or "substantially" generally means that the error or range of the index value is within 20%, preferably within 10%, and more preferably It is within 5 percent. In the text, unless otherwise stated, the numerical values referred to are regarded as approximations, such as an error or range indicated by "about", "about" or "substantial", or other approximations.
關於本文中所使用之『第一』、『第二』、...等,並非特別指稱次序或順位的意思,亦非用以限定本發明,其僅僅是為了區別以相同技術用語描述的元件或操作而已。The terms "first", "second", etc., as used herein, are not intended to refer to the order or the order, and are not intended to limit the invention, only to distinguish the elements described in the same technical terms. Or just operate.
其次,在本文中所使用的用詞「包含」、「包括」、「具有、「含有」等等,均為開放性的用語,即意指包含但不限於。Secondly, the terms "including", "including", "having", "containing", and the like, as used herein, are all open terms, meaning, but not limited to.
另外,關於本文中所使用之『耦接』或『連接』,均可指二或多個元件相互直接作實體或電性接觸,或是相互間接作實體或電性接觸,亦可指二或多個元件相互操作或動作。In addition, the term "coupled" or "connected" as used herein may mean that two or more elements are in direct physical or electrical contact with each other, or indirectly in physical or electrical contact with each other, or Multiple components operate or act upon each other.
第1圖是依照本發明實施例繪示一種觸控感應面板的示意圖。如第1圖所示,觸控感應面板100包含閘極驅動器110以及複數個感應電路120,其中閘極驅動器110用以透過信號傳輸線(如:掃描線、選擇線)傳送相應的閘極驅動信號(如:閘極驅動信號Gn 、Gn+1 、Gn+2 、...等)以及選擇信號(如:選擇信號Sn 、Sn+1 、Sn+2 、...等)分別至相應的感應電路120,使得感應電路120依據閘極驅動信號以及選擇信號配合觸控感應操作產生對應的輸出信號(如:輸出信號D1 、D2 、...等),以供判斷觸控操作是否進行。FIG. 1 is a schematic diagram of a touch sensing panel according to an embodiment of the invention. As shown in FIG. 1 , the touch sensing panel 100 includes a gate driver 110 and a plurality of sensing circuits 120 , wherein the gate driver 110 transmits a corresponding gate driving signal through a signal transmission line (eg, a scanning line or a selection line). (eg, gate drive signals G n , G n+1 , G n+2 , ..., etc.) and selection signals (eg, selection signals S n , S n+1 , S n+2 , ..., etc.) ) respectively, to the corresponding sensing circuit 120, so that the sensing circuit 120 generates a corresponding output signal (eg, output signals D 1 , D 2 , ..., etc.) according to the gate driving signal and the selection signal in cooperation with the touch sensing operation. Determine if the touch operation is in progress.
需說明的是,依據不同的實施方式及態樣,前述觸控感應面板100更可包括其它電路或元件(如:資料驅動器、顯示畫素、用以判讀輸出信號的讀取電路、...等等),然而為方便及清楚說明起見,第1圖僅例示性地繪示部分電路及元件,但其並非用以限制本發明。It should be noted that, according to different implementation manners and aspects, the touch sensing panel 100 may further include other circuits or components (eg, a data driver, a display pixel, a read circuit for interpreting an output signal, ... Etc., however, for convenience and clarity of description, FIG. 1 is only illustrative of a portion of the circuits and components, but is not intended to limit the invention.
第2圖是依照本發明實施例繪示一種如第1圖所示觸控感應面板中之感應電路的電路方塊示意圖。如第2圖所示,前述感應電路120中之至少一者或每一者可包含儲能單元210、光感測單元220以及充電單元230,其中光感測單元220電性耦接於儲能單元210,用以感測第一顏色 光,並依據所感測之第一顏色光的強度呈現相應的導通狀態以控制儲能單元210的放電,且用以依據一控制信號(如:閘極驅動信號Gn+1 )導通而對儲能單元210進行重置(Reset)。充電單元230則是電性耦接於儲能單元210,並於儲能單元210重置之過程中對儲能單元210進行充電。FIG. 2 is a block diagram showing the circuit of the sensing circuit in the touch sensing panel shown in FIG. 1 according to an embodiment of the invention. As shown in FIG. 2, at least one or each of the foregoing sensing circuits 120 may include an energy storage unit 210, a light sensing unit 220, and a charging unit 230, wherein the light sensing unit 220 is electrically coupled to the energy storage device. The unit 210 is configured to sense the first color light, and display a corresponding conduction state according to the intensity of the sensed first color light to control the discharge of the energy storage unit 210, and is configured to be driven according to a control signal (eg, gate drive) The signal G n+1 ) is turned on to reset the energy storage unit 210. The charging unit 230 is electrically coupled to the energy storage unit 210 and charges the energy storage unit 210 during the resetting of the energy storage unit 210.
其次,前述感應電路120亦可包括開關元件MR,其中開關元件MR電性耦接儲能單元210,並由閘極驅動信號Gn 控制而導通,使得儲能單元210所儲存之電壓的變化可經由開關元件MR輸出作為輸出信號Dn 以供判讀。實作上,開關元件MR可依據實際需求為NMOS電晶體或PMOS電晶體。The sensing circuit 120 can also include a switching element MR, wherein the switching element MR is electrically coupled to the energy storage unit 210 and is controlled by the gate driving signal G n to be turned on, so that the voltage stored in the energy storage unit 210 can be changed. The output is output via the switching element MR as an output signal D n for interpretation. In practice, the switching element MR can be an NMOS transistor or a PMOS transistor according to actual needs.
於操作上,在光感測單元220經照光的情形下,光感測單元220依據所感受光之強度導通,儲能單元210依據光感測單元220導通之程度透過光感測單元220放電,使得儲能單元210所儲存之電壓的變化可經由開關元件MR輸出作為輸出信號Dn 以供判讀。另一方面,在光感測單元220未經照光的情形下,光感測單元220依據閘極驅動信號Gn+1 導通,並藉由選擇信號Sn+1 對儲能單元210進行充電,同時充電單元230亦依據控制信號導通而藉由電源信號對儲能單元210進行充電,使得儲能單元210可充電至具有所需的重置電位。In operation, in the case that the light sensing unit 220 is illuminated, the light sensing unit 220 is turned on according to the intensity of the perceived light, and the energy storage unit 210 is discharged through the light sensing unit 220 according to the degree of the light sensing unit 220 being turned on. such that the change in the voltage of the energy storage unit 210 may be stored as the output signal of the D n for interpretation via the output switching element MR. On the other hand, in the case that the light sensing unit 220 is not illuminated, the light sensing unit 220 is turned on according to the gate driving signal G n+1 , and charges the energy storage unit 210 by the selection signal S n+1 . At the same time, the charging unit 230 also charges the energy storage unit 210 by the power signal according to the control signal being turned on, so that the energy storage unit 210 can be charged to have the required reset potential.
如此一來,對於在信號傳送路徑末端的感應電路120,當其中之儲能單元210因電阻電容負載(RC loading)效應而無法藉由光感測單元220重置至具有一定的電壓準 位時,仍可藉由充電單元230對儲能單元210進行充電,使得儲能單元210依然可充電至具有所需重置電位,避免在信號傳送路徑前端和末端的重置電位受電阻電容負載(RC loading)效應影響而導致感應輸出信號不同,進而防止觸控操作誤判的情形發生。In this way, for the sensing circuit 120 at the end of the signal transmission path, when the energy storage unit 210 is unable to be reset to a certain voltage level by the light sensing unit 220 due to the RC loading effect In the case of the bit, the energy storage unit 210 can still be charged by the charging unit 230, so that the energy storage unit 210 can still be charged to have the required reset potential, and the reset potential at the front end and the end of the signal transmission path is prevented from being subjected to the resistive capacitive load. The (RC loading) effect causes the sensing output signals to be different, thereby preventing the occurrence of misjudgment of the touch operation.
上述所稱對儲能單元210進行重置(Reset)的操作,主要係指在光感測單元220未經照光的情形下對儲能單元210進行充電至一定電位(如:重置電位),使得後續當觸控操作進行時,儲能單元210可依據光感測單元220感受光之強度透過光感測單元220放電。The operation of resetting the energy storage unit 210 as described above mainly refers to charging the energy storage unit 210 to a certain potential (for example, a reset potential) when the light sensing unit 220 is not illuminated. The energy storage unit 210 can be discharged through the light sensing unit 220 according to the intensity of the light perceived by the light sensing unit 220 when the touch operation is performed.
在一實施例中,儲能單元210可包括電容元件,光感測單元220可包括光感應元件(如:光電晶體)。其次,充電單元230所接收之控制信號可以是畫素控制信號、掃描驅動信號、選擇信號或是電路中其它相應操作節點上的電壓信號;換言之,本領域具通常知識者可依據實際需求採用在適當時間點開啟充電單元230的任何信號。同樣地,充電單元230所接收之電源信號亦可以是畫素控制信號、掃描驅動信號、選擇信號或是直流電壓信號;換言之,本領域具通常知識者可依據實際需求採用能對儲能單元210充電的任何信號。In an embodiment, the energy storage unit 210 may include a capacitive element, and the light sensing unit 220 may include a light sensing element (eg, a photoelectric crystal). Secondly, the control signal received by the charging unit 230 may be a pixel control signal, a scan driving signal, a selection signal or a voltage signal on other corresponding operating nodes in the circuit; in other words, those skilled in the art may adopt the Any signal of the charging unit 230 is turned on at an appropriate point in time. Similarly, the power signal received by the charging unit 230 can also be a pixel control signal, a scan driving signal, a selection signal, or a DC voltage signal. In other words, those skilled in the art can use the energy storage unit 210 according to actual needs. Any signal to charge.
第3圖是依照本發明第一實施例繪示一種如第2圖所示之感應電路的電路示意圖。如第3圖所示,在感應電路120a中,儲能單元210a包含電容元件C1,光感測單元220a包含光電晶體MP,其中光電晶體MP電性耦接電容元 件C1於操作節點Va,並用以感測第一顏色光的強度而呈現相應的導通狀態(例如:當光強度大時,流經光電晶體MP的導通電流相應增大,而當光強度小時,流經光電晶體MP的導通電流相應減小),使得電容元件C1透過光電晶體MP進行放電。其次,光電晶體係由控制信號(如:閘極驅動信號Gn+1 )所控制而導通,使得電容元件C1透過光電晶體MP進行重置,並於重置過程中藉由選擇信號Sn+1 進行充電。充電單元230a則電性耦接電容元件C1於操作節點Va,並於電容元件C1重置之過程中導通電容元件C1與一供應電壓VD ,使得充電單元230a由選擇信號Sn+1 充電的同時亦由供應電壓VD 進行充電,確保電容元件C1可充電至具有所需的重置電位。FIG. 3 is a circuit diagram showing a sensing circuit as shown in FIG. 2 according to the first embodiment of the present invention. As shown in FIG. 3, in the sensing circuit 120a, the energy storage unit 210a includes a capacitive element C1, and the light sensing unit 220a includes a photoelectric crystal MP, wherein the photoelectric crystal MP is electrically coupled to the capacitive element C1 at the operating node Va and used to Sensing the intensity of the first color light to exhibit a corresponding conduction state (for example, when the light intensity is large, the conduction current flowing through the photoelectric crystal MP is correspondingly increased, and when the light intensity is small, the conduction current flowing through the photoelectric crystal MP is correspondingly (Reduced), the capacitive element C1 is discharged through the photo-optical crystal MP. Secondly, the photo-crystal system is controlled by a control signal (eg, gate drive signal G n+1 ), so that the capacitor element C1 is reset through the optoelectronic crystal MP, and the signal S n+ is selected during the reset process. 1 Charge. The charging unit 230a is electrically coupled to the capacitive element C1 at the operating node Va, and turns on the capacitive element C1 and a supply voltage V D during the resetting of the capacitive element C1, so that the charging unit 230a is charged by the selection signal Sn +1 . At the same time, charging is also performed by the supply voltage V D to ensure that the capacitive element C1 can be charged to have the desired reset potential.
在一實施例中,充電單元230a係由儲能單元210a儲存之電壓所控制以選擇性地對儲能單元210a進行充電。如第3圖所示,充電單元230a更包含至少一開關元件(如:開關元件M1),開關元件M1具有一控制端、一第一端和一第二端,其中開關元件M1的控制端和第二端電性耦接電容元件C1於操作節點Va,開關元件M1的第一端用以電性耦接供應電壓VD 。In an embodiment, the charging unit 230a is controlled by the voltage stored by the energy storage unit 210a to selectively charge the energy storage unit 210a. As shown in FIG. 3, the charging unit 230a further includes at least one switching element (such as the switching element M1). The switching element M1 has a control end, a first end and a second end, wherein the control end of the switching element M1 The second end is electrically coupled to the capacitive element C1 at the operating node Va, and the first end of the switching element M1 is electrically coupled to the supply voltage V D .
實作上,依據不同的控制方式及電路連接方式,光電晶體MP以及開關元件M1可以是NMOS電晶體或PMOS電晶體。以開關元件M1為NMOS電晶體為例,開關元件M1的閘極和源極係電性耦接電容元件C1於操作節點Va,而開關元件M1的汲極則用以電性耦接供應電壓VD 。In practice, the photo transistor MP and the switching element M1 may be an NMOS transistor or a PMOS transistor according to different control modes and circuit connection modes. Taking the switching element M1 as an NMOS transistor as an example, the gate and the source of the switching element M1 are electrically coupled to the capacitive element C1 at the operating node Va, and the drain of the switching element M1 is electrically coupled to the supply voltage V. D.
在此,於電容元件C1的一端所耦接之電壓VC 為一定值的情形下,操作節點Va的電壓變化可以相當於電容元件C1所儲存之電壓變化;換言之,開關元件M1可以相當於由電容元件C1所儲存之電壓所控制,或是相當於由操作節點Va的電壓所控制。Here, in the case where the voltage V C coupled to one end of the capacitive element C1 is a constant value, the voltage change of the operating node Va may correspond to the voltage change stored by the capacitive element C1; in other words, the switching element M1 may be equivalent to The voltage stored by the capacitive element C1 is controlled or equivalent to the voltage of the operating node Va.
於操作上,在光電晶體MP經照光的情形下,光電晶體MP依據所感受光之強度導通,電容元件C1依據光電晶體MP導通之程度透過光電晶體MP放電,此時開關元件MR由閘極驅動信號Gn 控制而導通,使得電容元件C1所儲存之電壓的變化可經由開關元件MR輸出作為輸出信號Dn 以供判讀。In operation, in the case where the photoelectric crystal MP is illuminated, the photoelectric crystal MP is turned on according to the intensity of the perceived light, and the capacitive element C1 is discharged through the photoelectric crystal MP according to the degree of conduction of the photoelectric crystal MP, and the switching element MR is driven by the gate at this time. control signal G n is turned on, so that the variation of the voltage stored in the capacitance element C1 as the output signal D n for interpretation via the output switching element MR.
其次,在欲對電容元件C1充電時,光電晶體MP由閘極驅動信號Gn+1 控制而導通,且選擇信號Sn+1 經光電晶體MP傳送至電容元件C1而對電容元件C1充電,此時在電容元件C1所儲存之電壓(或操作節點Va的電壓)由選擇信號Sn+1 充電至一定電壓準位的情形下,開關元件M1由電容元件C1所儲存之電壓所控制而相應地導通電容元件C1與供應電壓VD ,使得電容元件C1可經開關元件M1同時由供應電壓VD 進行充電。Next, when the capacitive element C1 is to be charged, the photo transistor MP is controlled to be turned on by the gate driving signal Gn +1 , and the selection signal Sn +1 is transmitted to the capacitive element C1 via the phototransistor MP to charge the capacitive element C1. At this time, in the case where the voltage stored in the capacitive element C1 (or the voltage of the operating node Va) is charged to a certain voltage level by the selection signal S n+1 , the switching element M1 is controlled by the voltage stored by the capacitive element C1 and correspondingly The capacitive element C1 is electrically connected to the supply voltage V D such that the capacitive element C1 can be simultaneously charged by the supply voltage V D via the switching element M1.
第4圖是依照本發明第二實施例繪示一種如第2圖所示之感應電路的電路示意圖。相較於第3圖所示之實施例,在第4圖所示之感應電路120b中,充電單元230b包含開關元件M2和M3。開關元件M2具有一控制端、一第一端和一第二端,其中開關元件M2的控制端電性耦接電容 元件C1於操作節點Va,開關元件M2的第一端用以電性耦接供應電壓VD 。此外,開關元件M3具有一控制端、一第一端和一第二端,其中開關元件M3的控制端和第二端電性耦接電容元件C1於操作節點Va,開關元件M3的第一端電性耦接開關元件M2之第二端。4 is a circuit diagram showing a sensing circuit as shown in FIG. 2 according to a second embodiment of the present invention. In contrast to the embodiment shown in FIG. 3, in the sensing circuit 120b shown in FIG. 4, the charging unit 230b includes switching elements M2 and M3. The switching element M2 has a control end, a first end and a second end, wherein the control end of the switching element M2 is electrically coupled to the capacitive element C1 at the operating node Va, and the first end of the switching element M2 is electrically coupled Supply voltage V D . In addition, the switching element M3 has a control end, a first end and a second end, wherein the control end and the second end of the switching element M3 are electrically coupled to the capacitive element C1 at the operating node Va, and the first end of the switching element M3 The second end of the switching element M2 is electrically coupled.
相較於第3圖所示之實施例,由於充電單元230b更包括開關元件M2,因此可以更藉由開關元件M2作為調控供應電壓VD 進行充電的開關,更加確保光電晶體MP於照光時不作充電的動作。Compared with the embodiment shown in FIG. 3, since the charging unit 230b further includes the switching element M2, the switching element M2 can be further used as a switch for regulating the supply voltage V D to ensure that the photoelectric crystal MP is not used for illumination. Charging action.
實作上,依據不同的控制方式及電路連接方式,開關元件M2、M3可以是NMOS電晶體或PMOS電晶體。以開關元件M2、M3均為NMOS電晶體為例,開關元件M2的閘極以及開關元件M3的閘極和源極係電性耦接電容元件C1於操作節點Va,開關元件M2的汲極用以電性耦接供應電壓VD ,開關元件M2的源極電性耦接開關元件M3的汲極。此外,以開關元件M2、M3均為PMOS電晶體為例,電路連接方式可以類似前述,僅電壓設定不同而已,故於此不再贅述。另外,以實作的尺寸而言,開關元件M2、M3的尺寸係小於光電晶體MP的尺寸。In practice, the switching elements M2, M3 may be NMOS transistors or PMOS transistors according to different control modes and circuit connection modes. Taking the switching elements M2 and M3 as NMOS transistors as an example, the gate of the switching element M2 and the gate and source of the switching element M3 are electrically coupled to the capacitive element C1 at the operating node Va, and the drain of the switching element M2 is used. electrically coupled to the supply voltage V D, a source electrically coupled to the drain of the switching element M2 is connected to the switching element M3 pole. In addition, taking the switching elements M2 and M3 as PMOS transistors as an example, the circuit connection manner can be similar to the foregoing, and only the voltage setting is different, and thus will not be described herein. Further, the size of the switching elements M2, M3 is smaller than the size of the photo transistor MP in terms of the size of the actual implementation.
類似地,於操作上,在光電晶體MP經照光的情形下,電容元件C1依據光電晶體MP導通之程度透過光電晶體MP放電,開關元件MR由閘極驅動信號Gn 控制而導通,使得電容元件C1所儲存之電壓的變化可經由開關元件MR輸出作為輸出信號Dn 以供判讀。其次,在光電晶體MP未 經照光的情形下,光電晶體MP由閘極驅動信號Gn+1 控制而導通,且選擇信號Sn+1 經光電晶體MP傳送至電容元件C1而對電容元件C1充電,此時在電容元件C1所儲存之電壓(或操作節點Va的電壓)由選擇信號Sn+1 充電至一定電壓準位的情形下,開關元件M2和M3由電容元件C1所儲存之電壓所控制而相應地導通電容元件C1與供應電壓VD ,使得電容元件C1可經開關元件M2和M3同時由供應電壓VD 進行充電。Similarly, in operation, in the case of a phototransistor MP by illumination of the capacitive element C1 based on the degree of photo transistor MP is turned on it through a phototransistor MP discharge switching element MR driving signal G n is controlled by the gate is turned on so that the capacitive element the change in the voltage stored in C1 as the output signal D n MR element via the switching output for interpretation. Next, in the case where the photo-crystal MP is not illuminated, the photo-crystal MP is controlled to be turned on by the gate driving signal G n+1 , and the selection signal S n+1 is transmitted to the capacitive element C1 via the photo-crystal MP to the capacitive element C1. Charging, at this time, in the case where the voltage stored in the capacitive element C1 (or the voltage of the operating node Va) is charged to a certain voltage level by the selection signal S n+1 , the voltages of the switching elements M2 and M3 stored by the capacitive element C1 The capacitive element C1 and the supply voltage V D are controlled to be turned on accordingly, so that the capacitive element C1 can be simultaneously charged by the supply voltage V D via the switching elements M2 and M3.
第5圖是依照本發明第三實施例繪示一種如第2圖所示之感應電路的電路示意圖。相較於第3圖所示之實施例,在第5圖所示之感應電路120c中,充電單元230b包含開關元件M4和M5。開關元件M4具有一控制端、一第一端和一第二端,其中開關元件M4的控制端電性耦接電容元件C1於操作節點Va,開關元件M4的第一端用以電性耦接供應電壓VD 。此外,開關元件M5具有一控制端、一第一端和一第二端,其中開關元件M5的控制端和第一端電性耦接開關元件M4之第二端,開關元件M5的第二端電性耦接電容元件C1於操作節點Va。FIG. 5 is a circuit diagram showing a sensing circuit as shown in FIG. 2 according to a third embodiment of the present invention. In contrast to the embodiment shown in FIG. 3, in the sensing circuit 120c shown in FIG. 5, the charging unit 230b includes switching elements M4 and M5. The switching element M4 has a control end, a first end and a second end, wherein the control end of the switching element M4 is electrically coupled to the capacitive element C1 at the operating node Va, and the first end of the switching element M4 is electrically coupled Supply voltage V D . In addition, the switching element M5 has a control end, a first end and a second end, wherein the control end and the first end of the switching element M5 are electrically coupled to the second end of the switching element M4, and the second end of the switching element M5 The capacitive coupling element C1 is electrically coupled to the operating node Va.
實作上,依據不同的控制方式及電路連接方式,開關元件M4、M5可以是NMOS電晶體或PMOS電晶體。以開關元件M4、M5均為NMOS電晶體為例,開關元件M4的閘極電性耦接電容元件C1於操作節點Va,開關元件M4的汲極用以電性耦接供應電壓VD ,開關元件M5的閘極和汲極電性耦接開關元件M4的源極,開關元件M5的源極電 性耦接電容元件C1於操作節點Va。此外,以開關元件M4、M5均為PMOS電晶體為例,電路連接方式可以類似前述,僅電壓設定不同而已,故於此不再贅述。另外,以實作的尺寸而言,開關元件M4、M5的尺寸係小於光電晶體MP的尺寸。In practice, the switching elements M4, M5 may be NMOS transistors or PMOS transistors according to different control methods and circuit connections. Taking the NMOS transistors as the switching elements M4 and M5 as an example, the gate of the switching element M4 is electrically coupled to the capacitive element C1 at the operating node Va, and the drain of the switching element M4 is electrically coupled to the supply voltage V D , the switch The gate and the drain of the component M5 are electrically coupled to the source of the switching element M4. The source of the switching component M5 is electrically coupled to the capacitive component C1 at the operating node Va. In addition, taking the switching elements M4 and M5 as PMOS transistors as an example, the circuit connection manner can be similar to the foregoing, and only the voltage setting is different, so no further details are provided herein. Further, the size of the switching elements M4, M5 is smaller than the size of the photo transistor MP in terms of the size of the actual implementation.
類似地,於操作上,在光電晶體MP經照光的情形下,電容元件C1依據光電晶體MP導通之程度透過光電晶體MP放電,開關元件MR由閘極驅動信號Gn 控制而導通,使得電容元件C1所儲存之電壓的變化可經由開關元件MR輸出作為輸出信號Dn 以供判讀。其次,在欲對電容元件C1充電時,光電晶體MP由閘極驅動信號Gn+1 控制而導通,且選擇信號Sn+1 經光電晶體MP傳送至電容元件C1而對電容元件C1充電,此時在電容元件C1所儲存之電壓(或操作節點Va的電壓)由選擇信號Sn+1 充電至一定電壓準位的情形下,開關元件M4由電容元件C1所儲存之電壓所控制而相應地導通,且開關元件M5也依據開關元件M4的操作而導通,藉此導通電容元件C1與供應電壓VD ,使得電容元件C1可經開關元件M2和M3同時由供應電壓VD 進行充電。Similarly, in operation, in the case of a phototransistor MP by illumination of the capacitive element C1 based on the degree of photo transistor MP is turned on it through a phototransistor MP discharge switching element MR driving signal G n is controlled by the gate is turned on so that the capacitive element the change in the voltage stored in C1 as the output signal D n MR element via the switching output for interpretation. Next, when the capacitive element C1 is to be charged, the photo transistor MP is controlled to be turned on by the gate driving signal Gn +1 , and the selection signal Sn +1 is transmitted to the capacitive element C1 via the phototransistor MP to charge the capacitive element C1. At this time, in a case where the voltage stored in the capacitive element C1 (or the voltage of the operating node Va) is charged to a certain voltage level by the selection signal S n+1 , the switching element M4 is controlled by the voltage stored by the capacitive element C1 and correspondingly The ground is turned on, and the switching element M5 is also turned on according to the operation of the switching element M4, thereby turning on the capacitive element C1 and the supply voltage V D so that the capacitive element C1 can be simultaneously charged by the supply voltage V D via the switching elements M2 and M3.
另一方面,以前述第1圖所示之實施例而言,觸控感應面板100更可包含彩色濾光片150,其中彩色濾光片150相對於感應電路120所在之基板配置,且彩色濾光片150包含複數個色阻(如下列實施例所示之紅色、綠色、藍色色阻),供背光源所發出的光穿透而提供顯示影像時所需 之紅色光、綠色光或藍色光。On the other hand, in the embodiment shown in FIG. 1 , the touch sensing panel 100 further includes a color filter 150 , wherein the color filter 150 is disposed relative to the substrate where the sensing circuit 120 is located, and the color filter is configured. The light sheet 150 includes a plurality of color resists (such as the red, green, and blue color resists shown in the following embodiments) for the light emitted by the backlight to penetrate to provide a display image. Red, green or blue light.
然而,由於彩色濾光片所涵蓋的頻譜範圍較大,因此在彩色濾光片150相對於感應電路120配置的情形下,當其中光感測單元(或光電晶體)受到特定顏色的光源(如:單一顏色的LED光筆)照光並進行觸控操作時,會有混色的狀況發生,進而造成觸控操作的誤判。However, since the color filter covers a large spectral range, in the case where the color filter 150 is disposed relative to the sensing circuit 120, when the light sensing unit (or the photoelectric crystal) receives a light source of a specific color (eg, : Single-color LED light pen) When lighting and performing touch operation, there will be a situation of mixed colors, which may cause misjudgment of touch operation.
舉例來說,第6圖是繪示一種LED光筆與色阻的頻譜比較示意圖,其中CF_R、CF_G、CF_B分別代表紅色、綠色、藍色色阻所在之頻譜範圍,LED_R、LED_G、LED_B分別代表紅色、綠色、藍色LED光筆發射之光所在的頻譜範圍。由第6圖可知,因LED光筆與色阻所在的頻譜範圍重疊部分很大,故當光感測單元相對藍色色阻配置時,綠色光筆的光會透過藍色色阻,使得光感測單元依據綠色光筆的光產生漏電流,造成觸控誤判的情形;另外,當光感測單元相對紅色色阻配置時,藍色光筆的光會透過紅色色阻,使得光感測單元依據藍色光筆的光產生漏電流,造成觸控誤判的情形;其次當光感測單元相對綠色色阻配置時,紅色光筆的光會透過綠色色阻,使得光感測單元依據紅色光筆的光產生漏電流,造成觸控誤判的情形。For example, FIG. 6 is a schematic diagram showing a comparison of spectrums between an LED light pen and a color resistor, wherein CF_R, CF_G, and CF_B represent spectral ranges in which red, green, and blue color resists respectively, and LED_R, LED_G, and LED_B represent red, respectively. The spectrum range in which the green, blue LED stylus emits light. It can be seen from Fig. 6 that because the spectral range of the LED light pen and the color resistance overlaps greatly, when the light sensing unit is configured with respect to the blue color resistance, the light of the green light pen passes through the blue color resistance, so that the light sensing unit is based on The light of the green light pen generates leakage current, which causes a misjudgment of the touch. In addition, when the light sensing unit is configured with respect to the red color resist, the light of the blue light pen passes through the red color resist, so that the light sensing unit is based on the blue light pen. The light generates a leakage current, causing a misjudgment of the touch; secondly, when the light sensing unit is configured with respect to the green color resist, the light of the red light pen passes through the green color resist, so that the light sensing unit generates a leakage current according to the light of the red light pen, resulting in a leakage current. The situation of misjudgment of touch.
依據上述,在前述實施例中,充電單元更可包含至少一光感測元件,其用以感測一第二顏色光,並於光感測單元依據第二顏色光產生漏電流的情形下依據第二顏色光的強度產生相應之補償電流。舉例來說,第3圖所示之開關元件M1、第4圖所示之開關元件M2和M3或是第5圖 所示之開關元件M4和M5均可以是光感測元件,或是充電單元另包含光感測元件,藉以於漏電流產生的情形下產生相應之補償電流,避免觸控誤判的情形。According to the above, in the foregoing embodiment, the charging unit may further include at least one light sensing component for sensing a second color light, and the light sensing unit generates a leakage current according to the second color light. The intensity of the second color of light produces a corresponding compensation current. For example, the switching element M1 shown in FIG. 3, the switching elements M2 and M3 shown in FIG. 4, or the fifth drawing The switching elements M4 and M5 shown may each be a light sensing component, or the charging unit may further comprise a light sensing component, so that a corresponding compensation current is generated in the case of a leakage current to avoid a situation in which the touch is misjudged.
第7圖是依照本發明第四實施例繪示一種如第2圖所示之感應電路的電路示意圖。相較於第3圖所示之實施例,在第7圖所示之感應電路120d中,光電晶體MP相對應於綠色色阻CF_G配置,開關元件M1(或充電單元)相對應於紅色色阻CF_R配置,且開關元件M1為光感測元件而可依據相應之光強度呈相應之導通狀態。Figure 7 is a circuit diagram showing a sensing circuit as shown in Figure 2 in accordance with a fourth embodiment of the present invention. Compared with the embodiment shown in FIG. 3, in the sensing circuit 120d shown in FIG. 7, the photo transistor MP corresponds to the green color resistance CF_G, and the switching element M1 (or the charging unit) corresponds to the red color resistance. The CF_R is configured, and the switching element M1 is a light sensing element and can be in a corresponding conduction state according to the corresponding light intensity.
於操作上,在綠色LED光筆照光的情形下,光電晶體MP會正常操作而導通以產生相應的感應電流;另外在紅色LED光筆照光的情形下,因紅色LED光筆的光透過綠色色阻CF_G,故光電晶體MP依據紅色光會產生漏電流,此時元件M1會透過紅色色阻CF_R感測紅色光而產生相應的補償電流,以補償光電晶體MP透過綠色色阻CF_G依據紅色光所產生之漏電流,使得光電晶體MP產生的漏電流不會影響正常觸控操作信號的呈現,亦即可避免紅色光造成綠色色阻CF_G所對應的光感應信號失真,進而改善特定色阻與不同顏色光筆的光搭配操作的問題。In operation, in the case of green LED light pen illumination, the photoelectric crystal MP will normally operate to be turned on to generate a corresponding induced current; in addition, in the case of a red LED light pen, the light of the red LED light pen passes through the green color resistance CF_G, Therefore, the photoelectric crystal MP generates a leakage current according to the red light. At this time, the component M1 senses the red light through the red color resistance CF_R to generate a corresponding compensation current to compensate the leakage of the photoelectric crystal MP through the green color resistance CF_G according to the red light. The current causes the leakage current generated by the photo-electric crystal MP to not affect the presentation of the normal touch operation signal, and can also avoid the distortion of the light-sensitive signal corresponding to the green color resistance CF_G caused by the red light, thereby improving the specific color resistance and the different color light pens. The problem of light matching operation.
第8圖是依照本發明第五實施例繪示一種如第2圖所示之感應電路的電路示意圖。相較於第4圖所示之實施例,在第8圖所示之感應電路120e中,光電晶體MP相對應於綠色色阻CF_G配置,開關元件M2和M3(或充電單元)相對應於紅色色阻CF_R配置,且開關元件M2和M3 為光感測元件而可依據相應之光強度呈相應之導通狀態。FIG. 8 is a circuit diagram showing a sensing circuit as shown in FIG. 2 according to a fifth embodiment of the present invention. Compared with the embodiment shown in FIG. 4, in the sensing circuit 120e shown in FIG. 8, the photo transistor MP corresponds to the green color resistance CF_G, and the switching elements M2 and M3 (or the charging unit) correspond to the red color. Color resistance CF_R configuration, and switching elements M2 and M3 For the light sensing component, it can be in a corresponding conduction state according to the corresponding light intensity.
於操作上,在綠色LED光筆照光的情形下,光電晶體MP會正常操作而導通以產生相應的感應電流;另外在紅色LED光筆照光的情形下,因紅色LED光筆的光透過綠色色阻CF_G,故光電晶體MP依據紅色光會產生漏電流,此時元件M2和M3會透過紅色色阻CF_R感測紅色光而產生相應的補償電流,以補償光電晶體MP透過綠色色阻CF_G依據紅色光所產生之漏電流,可避免紅色光造成綠色色阻CF_G所對應的光感應信號失真,進而改善特定色阻與不同顏色光筆的光搭配操作的問題。In operation, in the case of green LED light pen illumination, the photoelectric crystal MP will normally operate to be turned on to generate a corresponding induced current; in addition, in the case of a red LED light pen, the light of the red LED light pen passes through the green color resistance CF_G, Therefore, the photo-electric crystal MP generates leakage current according to the red light. At this time, the components M2 and M3 sense red light through the red color resistance CF_R to generate a corresponding compensation current to compensate the photoelectric crystal MP to generate the green color resistance CF_G according to the red light. The leakage current can avoid the distortion of the optical sensing signal corresponding to the green color resistance CF_G caused by the red light, thereby improving the problem of the light matching operation between the specific color resistance and the different color light pens.
第9圖是依照本發明第六實施例繪示一種如第2圖所示之感應電路的電路示意圖。相較於第5圖所示之實施例,在第9圖所示之感應電路120f中,光電晶體MP相對應於綠色色阻CF_G配置,開關元件M4和M5(或充電單元)相對應於紅色色阻CF_R配置,且開關元件M4和M5為光感測元件而可依據相應之光強度呈相應之導通狀態。Figure 9 is a circuit diagram showing a sensing circuit as shown in Figure 2 in accordance with a sixth embodiment of the present invention. Compared with the embodiment shown in FIG. 5, in the sensing circuit 120f shown in FIG. 9, the photo transistor MP corresponds to the green color resistance CF_G, and the switching elements M4 and M5 (or the charging unit) correspond to the red color. The color resistance CF_R is configured, and the switching elements M4 and M5 are light sensing elements and can be in a corresponding conduction state according to the corresponding light intensity.
同樣地,在紅色LED光筆照光的情形下,因紅色LED光筆的光透過綠色色阻CF_G,故光電晶體MP會依據紅色光產生漏電流,此時元件M4和M5會透過紅色色阻CF_R感測紅色光而產生相應的補償電流,以補償光電晶體MP透過綠色色阻CF_G依據紅色光所產生之漏電流,可避免紅色光造成綠色色阻CF_G所對應的光感應信號失真,進而改善特定色阻與不同顏色光筆的光搭配操作的問題。Similarly, in the case of red LED light pen illumination, since the light of the red LED light pen passes through the green color resistance CF_G, the photoelectric crystal MP generates a leakage current according to the red light, and at this time, the components M4 and M5 are transmitted through the red color resistance CF_R. The red light generates a corresponding compensation current to compensate the leakage current generated by the photoelectric crystal MP through the green color resistance CF_G according to the red light, thereby avoiding the distortion of the light sensing signal corresponding to the green color resistance CF_G caused by the red light, thereby improving the specific color resistance. The problem of working with light of different color light pens.
第10圖是依照本發明第七實施例繪示一種如第2 圖所示之感應電路的電路示意圖。相較於第9圖所示之實施例,在第10圖所示之感應電路120g中,光電晶體MP相對應於藍色色阻CF_B配置,開關元件M4和M5(或充電單元)相對應於綠色色阻CF_G配置,且開關元件M4和M5為光感測元件而可依據相應之光強度呈相應之導通狀態。Figure 10 is a diagram showing the second embodiment according to the seventh embodiment of the present invention. The circuit diagram of the sensing circuit shown in the figure. Compared with the embodiment shown in FIG. 9, in the sensing circuit 120g shown in FIG. 10, the photo transistor MP corresponds to the blue color resistance CF_B, and the switching elements M4 and M5 (or the charging unit) correspond to the green. The color resistance CF_G is configured, and the switching elements M4 and M5 are light sensing elements and can be in a corresponding conduction state according to the corresponding light intensity.
類似地,在綠色LED光筆照光的情形下,因綠色LED光筆的光透過藍色色阻CF_B,故光電晶體MP會依據綠色光產生漏電流,此時元件M4和M5會透過綠色色阻CF_G感測綠色光而產生相應的補償電流,以補償光電晶體MP透過藍色色阻CF_B依據綠色光所產生之漏電流,可避免綠色光造成藍色色阻CF_B所對應的光感應信號失真,進而改善特定色阻與不同顏色光筆的光搭配操作的問題。Similarly, in the case of green LED light pen illumination, since the light of the green LED light pen passes through the blue color resistance CF_B, the photoelectric crystal MP generates a leakage current according to the green light, and at this time, the components M4 and M5 are sensed by the green color resistance CF_G. The green light generates a corresponding compensation current to compensate the leakage current generated by the photoelectric crystal MP through the blue color resistance CF_B according to the green light, thereby avoiding the distortion of the optical sensing signal corresponding to the blue color resistance CF_B caused by the green light, thereby improving the specific color resistance. The problem of working with light of different color light pens.
其它不同顏色色阻的配置與不同顏色光搭配操作的情形均類似上述的補償方式,並可依此類推,故於此不再贅述。The configuration of other different color resists and the operation of different color light matching operations are similar to the above-mentioned compensation methods, and can be deduced by analogy, and thus will not be described herein.
由上述可知,應用前述本發明之實施例可以有效地改善因電阻電容負載(RC loading)效應而導致感應輸出信號有誤的情形,進而防止觸控操作誤判的情形發生,而且更可以改善特定色阻與不同顏色光筆的光搭配操作而產生漏電流的問題,避免影響正常觸控信號的產生。It can be seen from the above that the application of the foregoing embodiments of the present invention can effectively improve the situation that the induced output signal is incorrect due to the RC loading effect, thereby preventing the occurrence of misjudgment of the touch operation and improving the specific color. The problem of leakage current is prevented by the operation of the light of different color light pens, so as to avoid affecting the generation of normal touch signals.
雖然本發明已以實施方式揭露如上,然其並非用以限定本發明,任何本領域具通常知識者,在不脫離本發明之精神和範圍內,當可作各種之更動與潤飾,因此本發明 之保護範圍當視後附之申請專利範圍所界定者為準。The present invention has been disclosed in the above embodiments, but it is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.
120‧‧‧感應電路120‧‧‧Induction circuit
210‧‧‧儲能單元210‧‧‧ Energy storage unit
220‧‧‧光感測單元220‧‧‧Light sensing unit
230‧‧‧充電單元230‧‧‧Charging unit
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TW201447689A (en) | 2014-12-16 |
CN103488349B (en) | 2016-08-10 |
CN103488349A (en) | 2014-01-01 |
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