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CN101101525A - Touch control panel - Google Patents

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Publication number
CN101101525A
CN101101525A CNA2007101411491A CN200710141149A CN101101525A CN 101101525 A CN101101525 A CN 101101525A CN A2007101411491 A CNA2007101411491 A CN A2007101411491A CN 200710141149 A CN200710141149 A CN 200710141149A CN 101101525 A CN101101525 A CN 101101525A
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coupled
terminal
touch panel
pixel
sensing signal
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CN100535844C (en
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李信宏
刘柏源
江明峰
刘俊欣
陈纪文
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AUO Corp
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AU Optronics Corp
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Abstract

本发明提供一种触控式面板。该触控式面板包含多个像素，每个像素包含一感光元件、一感压元件及一开关；感光元件于感光时产生第一感测信号；感压元件，于受压时产生第二感测信号；开关包含：一第一端，耦接于该感光元件与该感压元件；一控制端，用以接收一栅极驱动信号；及一第二端，用以根据该栅极驱动信号，传送该第一感测信号与该第二感测信号。通过本发明，即使当周围环境皆没有光源时，像素也可根据可变电容的电容值大小，来检测是否有被触碰。

Figure 200710141149

The present invention provides a touch panel. The touch panel includes a plurality of pixels, each pixel includes a photosensitive element, a pressure-sensitive element and a switch; the photosensitive element generates a first sensing signal when receiving light; the pressure-sensitive element generates a second sensing signal when receiving pressure; the switch includes: a first end coupled to the photosensitive element and the pressure-sensitive element; a control end for receiving a gate drive signal; and a second end for transmitting the first sensing signal and the second sensing signal according to the gate drive signal. Through the present invention, even when there is no light source in the surrounding environment, the pixel can detect whether it is touched according to the capacitance value of the variable capacitor.

Figure 200710141149

Description

Touch panel
Technical field
The present invention is about a kind of touch panel, especially in regard to a kind of touch panel with pixel of photo-sensitive cell and sensing element.
Background technology
Please refer to Fig. 1.Fig. 1 is the synoptic diagram of the touch panel pixel Pa of prior art.As shown in the figure, pixel Pa comprises switch SW, photo-sensitive cell PD.Switch SW can be a thin film transistor (TFT) (Thin FilmTransistor, TFT); Photo-sensitive cell PD can be a photodiode (photo diode).Photo-sensitive cell PD one end is coupled to second end of switch SW, and the other end is coupled to a bias generator Vb.When photo-sensitive cell PD receives light source when (representing not touched), just can produce electric current I, and current potential Va is pulled down to Vb; Otherwise,, just can not produce electric current I, and current potential Va just can keep original level when photo-sensitive cell PD does not receive light source when (representing touched).Second end that first end that the control end of switch SW is coupled to the pairing gate line of pixel Pa, switch SW is coupled to the pairing data read line of pixel Pa, switch SW is coupled to the end of photo-sensitive cell PD, when the control end of switch SW receives gate drive signal that corresponding gate line transmits and when first end of switch SW is coupled to second end, the pairing data read line of pixel Pa just can receive the current potential Va on second end of switch SW.And the touch panel of prior art is according to the height of current potential Va, and it is touched to judge whether pixel Pa has.
Yet, the shortcoming of the pixel Pa of the touch panel of prior art is when not having light source in the surrounding environment (as touch panel being placed dark place), in any case then photo-sensitive cell PD all can't experience light source and produce electric current, therefore it is touched to have no way of also learning whether pixel Pa has, the touch panel made from pixel Pa thus, its usable range will enjoy restriction, and reduce user's convenience greatly.
Summary of the invention
The invention provides a kind of touch panel.This touch panel comprises a plurality of pixels, and each pixel comprises a photo-sensitive cell, produces one first sensing signal when sensitization; One sensing element produces one second sensing signal when pressurized; And a switch, comprise: one first end is coupled to this photo-sensitive cell and this sensing element; One control end is in order to receive a gate drive signal; And one second end, in order to according to this gate drive signal, transmit this first sensing signal and this second sensing signal.
Above-mentioned touch panel wherein preferably, also comprises many gate lines, in order to transmit the switch of a plurality of gate drive signals to described a plurality of pixels.
Above-mentioned touch panel wherein preferably, also comprises many data read lines, is coupled to second end of each switch of described a plurality of pixels, in order to transmit this first sensing signal or this second sensing signal.
Above-mentioned touch panel, wherein preferably, this photo-sensitive cell comprises a photodiode, and this photodiode comprises: one first end is coupled to one first voltage; One control end is coupled to first end of this photodiode; Reach one second end, be coupled to first end of this switch.
Above-mentioned touch panel, wherein preferably, this sensing element comprises a variable capacitance, and an end is coupled to first end of this switch, and the other end is coupled to one second voltage, changes the size of its capacitance when pressurized.
Above-mentioned touch panel wherein preferably, also comprises a plurality of testing circuits, receives first sensing signal and second sensing signal carried by described many data read lines.
Above-mentioned touch panel, wherein preferably, arbitrary described testing circuit comprises: an amplifier comprises: a positive input terminal, in order to receive a reference voltage; One negative input end is coupled to arbitrary described many data read lines; And an output terminal, in order to the voltage of output according to this first and second sensing signal conversion; One electric capacity is coupled between the output terminal and negative input end of this amplifier; And a switch, be coupled between the output terminal and negative input end of this amplifier, in order to the corresponding gate drive signal of receiving according to this pixel-by-pixel basis this amplifier input terminal is coupled to output terminal.
The present invention also provides a kind of touch panel.This touch panel comprises a plurality of first pixels, and each first pixel comprises a photo-sensitive cell, produces one first sensing signal when sensitization; And a switch, comprise one first end, be coupled to this photo-sensitive cell; One control end is in order to receive a first grid drive signal; And one second end, in order to according to this first grid drive signal, transmit this first sensing signal; And a plurality of second pixels, each second pixel comprises a sensing element, produces one second sensing signal when pressurized; And a switch, comprise one first end, be coupled to this sensing element; One control end is in order to receive a second grid drive signal; And one second end, in order to according to this second grid drive signal, transmit this second sensing signal.
By the present invention, even when surrounding environment does not all have light source, pixel also can be according to the capacitance size of variable capacitance, detect whether have touched.
Description of drawings
Fig. 1 is the synoptic diagram of the touch panel pixel of prior art.
Fig. 2 is the synoptic diagram of the pixel of touch panel of the present invention.
Fig. 3 is the synoptic diagram of another pixel of the present invention.
Fig. 4 is the synoptic diagram according to the touch panel of the first embodiment of the present invention.
Fig. 5 is the synoptic diagram of touch panel according to a second embodiment of the present invention.
Wherein, description of reference numerals is as follows:
Pa Pb Pc pixel
The PD photo-sensitive cell
The Cv variable capacitance
Cfb electric capacity
The I electric current
SW SW2 switch
Va Vcom Vb voltage
210 integrators
211 amplifiers
400 500 touch panels
410 gate driver circuits
420 data reading circuits
S1 S2 S3 gate drive signal
Embodiment
Please refer to Fig. 2.Fig. 2 is the synoptic diagram of the pixel Pb of touch panel of the present invention.As shown in the figure, pixel Pb and pixel Pa are similar, and same section repeats no more in this, and difference is that the newly-increased variable capacitance Cv of pixel Pb is in second end of switch SW.Variable capacitance Cv one end is coupled to second end of switch SW, and the other end is coupled to a common ends Vcom (just being loaded with voltage Vcom on the common ends).And when pixel Pb was touched, the capacitance size of variable capacitance Cv will change, and therefore also can influence the size of current potential Va.Thus, when pixel Pb was not touched, photo-sensitive cell PD can produce electric current I and influence current potential Va; When pixel was touched, photo-sensitive cell PD can not produce electric current I but the capacitance change of variable capacitance Cv also can influence current potential Va.In other words, when surrounding environment did not all have light source, pixel Pb also can be according to the capacitance size of variable capacitance Cv, detect whether have touched.
In addition, in Fig. 2, on the data read line of pixel Pb correspondence, coupled an integrator 210 (testing circuit), touched with helping to judge whether pixel Pb has.Integrator 210 has comprised a switch SW 2, a capacitor C fb, an amplifier 211.The positive input terminal of amplifier 211 is coupled to a reference voltage source, in order to receive a reference voltage Vref, negative input end is coupled to pairing data read line, output terminal in order to export an output voltage V out; Switch SW 2 is coupled between the negative input end and output terminal of amplifier 211; Capacitor C fb is coupled between the negative input end and output terminal of amplifier.When pixel Pb received corresponding gate drive signal, switch SW 2 was a closed condition, just opens circuit; And when pixel Pb did not receive corresponding gate drive signal again, switch SW 2 was an opening, just the negative input end of amplifier 211 is coupled to the output terminal of amplifier 211.
When variable capacitance Cv was not touched, its capacitance was Cst1; When variable capacitance Cv was touched, its capacitance became Cst2.It is that the output voltage of Q (max)=Cst1 (Vref-Vcom), integrator 210 is Vout (max)=Cst1 (Vref-Vcom)/Cfb to the maximum that variable capacitance Cv can store maximum electric charge.Under not touched state (photo-sensitive cell PD has sensitization), the output voltage of integrator 210
Figure A20071014114900081
Wherein Va (t) represents the voltage of current potential Va, and Tf represents the time that picture upgraded, and I is the electric current of photo-sensitive cell PD institute conducting.Under touched state (photo-sensitive cell PD does not have sensitization), photo-sensitive cell PD is no current I conducting just, thus the output voltage V out=of integrator 210 (Cst2-Cst1) (Vcom-Vref)/Cfb.Find out by above-mentioned, the voltage Vout that integrator 210 is exported, pixel Pb have touched and not touched state under, be difference to some extent, therefore can to judge effectively in view of the above whether pixel Pb has touched.
Please refer to Fig. 3.Fig. 3 is the synoptic diagram of another pixel Pc of the present invention.Pixel Pc and pixel Pb are similar, and difference only is to have lacked photo-sensitive cell PD among the pixel Pc, and so pixel Pc can be directly according to the variation of variable capacitance Cv capacitance, detected not touched, and the use of saving photo-sensitive cell PD.
Please refer to Fig. 4.Fig. 4 is the synoptic diagram according to the touch panel 400 of the first embodiment of the present invention.As shown in the figure, touch panel 400 has comprised gate driver circuit 410, data reading circuit 420, a plurality of integrator (testing circuit) 210 and a plurality of pixel Pb.Gate driver circuit 410 is in order to transmitting gate drive signal S1, S2, S3... etc. respectively in regular turn to corresponding pixel, and the gate drive signal that data reading circuit 420 is also transmitted according to gate driver circuit 410 goes to detect corresponding pixel whether touched (the output voltage V out by integrator 210 judges) is arranged.It is touched and improve user's convenience which pixel touch panel 400 can effectively detect thus.
Please refer to Fig. 5.Fig. 5 is the synoptic diagram of touch panel 500 according to a second embodiment of the present invention.As shown in the figure, touch panel 500 has comprised gate driver circuit 410, data reading circuit 420, a plurality of integrator 210 and a plurality of pixel Pa, Pc.Gate driver circuit 410 is in order to transmitting gate drive signal S1, S2, S3... etc. respectively in regular turn to corresponding pixel, and the gate drive signal that data reading circuit 420 is also transmitted according to gate driver circuit 410 goes to detect corresponding pixel whether touched (the output voltage V out by integrator 210 judges) is arranged.It is touched and improve user's convenience which pixel touch panel 500 can effectively detect thus.
Though the present invention discloses as above with preferred embodiment; yet it is not in order to qualification the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; still can do a little change and retouching, so protection scope of the present invention is as the criterion when looking the scope that claim defines.

Claims (14)

1.一种触控式面板，包含：1. A touch panel, comprising: 多个像素，每个像素包含：Multiple pixels, each pixel containing: 一感光元件，于感光时产生一第一感测信号；A photosensitive element, which generates a first sensing signal when receiving light; 一感压元件，于受压时产生一第二感测信号；及A pressure-sensitive element generates a second sensing signal when pressed; and 一开关，包含：A switch, including: 一第一端，耦接于该感光元件与该感压元件；a first end coupled to the photosensitive element and the pressure sensitive element; 一控制端，用以接收一栅极驱动信号；及a control terminal for receiving a gate driving signal; and 一第二端，用以根据该栅极驱动信号，传送该第一感测信号与该第二感测信号。A second terminal is used for transmitting the first sensing signal and the second sensing signal according to the gate driving signal. 2.如权利要求1所述的触控式面板，还包含多条栅极线，用以传送多个栅极驱动信号至所述多个像素的开关。2. The touch panel as claimed in claim 1, further comprising a plurality of gate lines for transmitting a plurality of gate driving signals to the switches of the plurality of pixels. 3.如权利要求1所述的触控式面板，还包含多条数据读取线，耦接于所述多个像素的各开关的第二端，用以传送该第一感测信号或该第二感测信号。3. The touch panel as claimed in claim 1, further comprising a plurality of data readout lines coupled to the second ends of the switches of the plurality of pixels for transmitting the first sensing signal or the the second sensing signal. 4.如权利要求1所述的触控式面板，其中该感光元件包含一光电二极管，该光电二极管包含：4. The touch panel according to claim 1, wherein the photosensitive element comprises a photodiode, and the photodiode comprises: 一第一端，耦接于一第一电压；a first terminal coupled to a first voltage; 一控制端，耦接于该光电二极管的第一端；及a control terminal coupled to the first terminal of the photodiode; and 一第二端，耦接于该开关的第一端。A second terminal is coupled to the first terminal of the switch. 5.如权利要求1所述的触控式面板，其中该感压元件包含一可变电容，一端耦接于该开关的第一端，另一端耦接于一第二电压，于受压时改变其电容值的大小。5. The touch panel as claimed in claim 1, wherein the pressure sensing element comprises a variable capacitor, one end of which is coupled to the first end of the switch, and the other end is coupled to a second voltage, when pressed Change the size of its capacitance value. 6.如权利要求1所述的触控式面板，还包含多个检测电路，接收由所述多条数据读取线输送的第一感测信号与第二感测信号。6. The touch panel as claimed in claim 1, further comprising a plurality of detection circuits for receiving the first sensing signal and the second sensing signal transmitted by the plurality of data reading lines. 7.如权利要求6所述的触控式面板，其中任一所述检测电路包含：7. The touch panel as claimed in claim 6, wherein any one of the detection circuits comprises: 一放大器，包含：An amplifier, comprising: 一正输入端，用以接收一参考电压；a positive input terminal for receiving a reference voltage; 一负输入端，耦接于任一所述多条数据读取线；及a negative input terminal coupled to any one of the plurality of data readout lines; and 一输出端，用以输出根据该第一与第二感测信号转换的电压；an output terminal for outputting a voltage converted according to the first and second sensing signals; 一电容，耦接于该放大器的输出端与负输入端之间；及a capacitor coupled between the output terminal of the amplifier and the negative input terminal; and 一开关，耦接于该放大器的输出端与负输入端之间，用以根据该像素接收到的对应栅极驱动信号将该放大器的输入端耦接于输出端。A switch is coupled between the output terminal of the amplifier and the negative input terminal, and is used for coupling the input terminal of the amplifier to the output terminal according to the corresponding gate driving signal received by the pixel. 8.一种触控式面板，包含：8. A touch panel, comprising: 多个第一像素，每个第一像素包含：a plurality of first pixels, each first pixel comprising: 一感光元件，用以感测光线的有无并产生一第一感测信号；及a photosensitive element for sensing the presence or absence of light and generating a first sensing signal; and 一开关，包含：A switch, including: 一第一端，耦接于该感光元件；a first end coupled to the photosensitive element; 一控制端，用以接收一第一栅极驱动信号；及a control terminal for receiving a first gate driving signal; and 一第二端，用以根据该第一栅极驱动信号，传送该第一感测信号；及a second terminal, used for transmitting the first sensing signal according to the first gate driving signal; and 多个第二像素，每个第二像素包含：a plurality of second pixels, each second pixel comprising: 一感压元件，用以感测压力并产生一第二感测信号；及a pressure sensing element, used for sensing pressure and generating a second sensing signal; and 一开关，包含：A switch, including: 一第一端，耦接于该感压元件；a first end coupled to the pressure-sensitive element; 一控制端，用以接收一第二栅极驱动信号；及a control terminal for receiving a second gate driving signal; and 一第二端，用以根据该第二栅极驱动信号，传送该第二感测信号。A second terminal is used for transmitting the second sensing signal according to the second gate driving signal. 9.如权利要求8所述的触控式面板，还包含多条栅极驱动线，用以传送多个第一栅极驱动信号与多个第二栅极驱动信号分别至所述多个第一像素的开关与所述多个第二像素的开关。9. The touch panel according to claim 8, further comprising a plurality of gate driving lines for transmitting a plurality of first gate driving signals and a plurality of second gate driving signals to the plurality of first gate driving signals respectively. A pixel switch and the plurality of second pixel switches. 10.如权利要求8所述的触控式面板，还包含多条数据读取线，耦接于所述多个第一像素与所述第二像素的各开关的第二端，用以传送该第一感测信号或该第二感测信号。10. The touch panel according to claim 8, further comprising a plurality of data readout lines, coupled to the second ends of the switches of the plurality of first pixels and the second pixels, for transmitting The first sensing signal or the second sensing signal. 11.如权利要求8所述的触控式面板，其中该感光元件包含一光电二极管，该光电二极管包含：11. The touch panel according to claim 8, wherein the photosensitive element comprises a photodiode, and the photodiode comprises: 一第一端，耦接于一第一电压；a first terminal coupled to a first voltage; 一控制端，耦接于该光电二极管的第一端；及a control terminal coupled to the first terminal of the photodiode; and 一第二端，耦接于该第一像素的开关的第一端。A second terminal is coupled to the first terminal of the switch of the first pixel. 12.如权利要求8所述的触控式面板，其中该感压元件包含一可变电容，一端耦接于该第二像素的开关的第一端，另一端耦接于一第二电压，于受压时改变其电容值的大小。12. The touch panel as claimed in claim 8, wherein the pressure sensing element comprises a variable capacitor, one end of which is coupled to the first end of the switch of the second pixel, and the other end is coupled to a second voltage, Change the size of its capacitance value when it is under pressure. 13.如权利要求8所述的触控式面板，还包含多个检测电路，接收由所述多条数据读取线输送的第一感测信号与第二感测信号。13. The touch panel as claimed in claim 8, further comprising a plurality of detection circuits for receiving the first sensing signal and the second sensing signal transmitted by the plurality of data reading lines. 14.如权利要求13所述的触控式面板，其中任一所述检测电路包含：14. The touch panel as claimed in claim 13, wherein any one of the detection circuits comprises: 一放大器，包含：An amplifier, comprising: 一正输入端，用以接收一参考电压；a positive input terminal for receiving a reference voltage; 一负输入端，耦接于任一所述多条数据读取线；及a negative input terminal coupled to any one of the plurality of data readout lines; and 一输出端，用以输出根据该第一与第二感测信号转换的电压；an output terminal for outputting a voltage converted according to the first and second sensing signals; 一电容，耦接于该放大器的输出端与负输入端之间；及a capacitor coupled between the output terminal of the amplifier and the negative input terminal; and 一开关，耦接于该放大器的输出端与负输入端之间，用以根据该第一像素接收到的对应栅极驱动信号将该放大器的输入端耦接于输出端。A switch, coupled between the output terminal and the negative input terminal of the amplifier, is used for coupling the input terminal of the amplifier to the output terminal according to the corresponding gate driving signal received by the first pixel.
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