TWI434200B - Display panel having photo-detection positioning functionality - Google Patents

Description

Display panel with light sensing position function

The invention relates to a display panel, in particular to a display panel with a light sensing position function.

In recent years, electronic products with panel input mechanisms have become popular products, and the input display panel is used as a communication interface between the user and the electronic product, so that the user can directly control the operation of the electronic product through the display panel without Through the keyboard or mouse. The input mechanism of the input display panel is divided into a light sensing input mode and a touch input mode, wherein the touch input mode is easy to damage the panel due to frequent panel touch actions, so the display based on the light sensing input mode is displayed. The panel can have a long service life. It is known that the light sensing position mechanism of the display panel based on the light sensing input mode can be divided into a passive architecture and an active architecture. In the operation of the passive light sensing position mechanism, since the light sensing signal is generated only according to the leakage current after the light sensing element receives light, the light sensing sensitivity is low. As for the active light sensing position mechanism, the light receiving state of the light sensing element is utilized to adjust the gate voltage of the amplifying transistor, thereby generating a light sensing signal with high sensitivity. However, since the high and low bias voltages applied to the light-sensing element and the amplifying transistor are fixed voltages during the operation of the active light sensing device, the component characteristics are easily shifted due to long-term fixed voltage stress. This causes an error in the light sensing signal, which in turn causes malfunction of the subsequent stage circuit.

A display panel includes a voltage supply unit and a sensing unit according to an embodiment of the invention. The voltage supply unit is configured to provide a first driving voltage and a second driving voltage. The sensing unit is electrically connected to the voltage supply unit for providing the read signal according to the first driving voltage and the second driving voltage. The sensing unit includes a first transistor, a second transistor, and a third transistor. The first transistor includes a first end, a second end and a gate terminal, wherein the first end of the first transistor is electrically connected to the voltage supply unit to receive the first driving voltage, and the second end of the first transistor is electrically connected to the first The gate of a transistor is extreme. The second transistor includes a first end, a second end and a gate terminal, wherein the first end of the second transistor is electrically connected to the second end of the first transistor, and the second end of the second transistor is electrically connected to the gate terminal The voltage supply unit is configured to receive the second driving voltage. The third transistor includes a first end, a second end and a gate terminal, wherein the first end of the third transistor is electrically connected to the voltage supply unit to receive the first driving voltage, and the gate terminal of the third transistor is electrically connected to the first The second end of the transistor and the second end of the third transistor are used to output a read signal. Each operation cycle of the sensing unit includes a first time period and a second time period, the first driving voltage is higher than the second driving voltage in the first time period, and the first driving voltage is lower than the second driving voltage in the second time period .

According to an embodiment of the invention, a display panel includes a voltage supply unit, a scan line, and a sensing unit. The voltage supply unit is used to provide an AC drive voltage. The scan line is used to transmit scan signals with periodic pulse waves. The sensing unit is electrically connected to the voltage supply unit for providing a read signal according to the AC driving voltage and the scanning signal. The sensing unit includes a first transistor, a second transistor, and a third transistor. The first transistor includes a first end, a second end and a gate terminal, wherein the first end of the first transistor is electrically connected to the voltage supply unit to receive the AC driving voltage, and the second end of the first transistor is electrically connected to the first The gate of the transistor is extreme. The second transistor includes a first end, a second end and a gate terminal, wherein the first end of the second transistor is electrically connected to the second end of the first transistor, and the second end of the second transistor is electrically connected to the gate terminal Scan the line to receive the scan signal. The third transistor includes a first end, a second end and a gate terminal, wherein the first end of the third transistor is electrically connected to the voltage supply unit to receive the AC driving voltage, and the gate terminal of the third transistor is electrically connected to the first electrode The second end of the crystal, the second end of the third transistor is used to output a read signal. Each operation cycle of the sensing unit includes a first time period and a second time period. The first scanning signal is higher than the AC driving voltage in the first time period, and the first scanning signal is lower than the AC driving voltage in the second time period.

According to an embodiment of the invention, a display panel includes a voltage supply unit, a scan line, and a sensing unit. The voltage supply unit is used to provide an AC drive voltage. The scan line is used to transmit scan signals with periodic pulse waves. The sensing unit is electrically connected to the voltage supply unit for providing a read signal according to the AC driving voltage and the scanning signal. The sensing unit includes a first transistor, a second transistor, and a third transistor. The first transistor includes a first end, a second end and a gate terminal, wherein the first end of the first transistor is electrically connected to the scan line to receive the scan signal, and the second end of the first transistor is electrically connected to the first transistor The extreme of the gate. The second transistor includes a first end, a second end and a gate terminal, wherein the first end of the second transistor is electrically connected to the second end of the first transistor, and the second end of the second transistor is electrically connected to the gate terminal The voltage supply unit receives the AC drive voltage. The third transistor includes a first end, a second end and a gate terminal, wherein the first end of the third transistor is electrically connected to the scan line to receive the scan signal, and the gate end of the third transistor is electrically connected to the first transistor At the second end, the second end of the third transistor is used to output a read signal. Each operation cycle of the sensing unit includes a first time period and a second time period. The first scanning signal is higher than the AC driving voltage in the first time period, and the first scanning signal is lower than the AC driving voltage in the second time period.

In the following, the display panel with the light-sensing function is described in detail with reference to the accompanying drawings, but the embodiments are not intended to limit the scope of the invention.

FIG. 1 is a schematic view showing a first embodiment of a display panel having a light sensing position function according to the present invention. As shown in FIG. 1 , the display panel 100 includes a plurality of scan lines 101 , a plurality of data lines 102 , a plurality of pixel units 105 , a plurality of read lines 110 , a plurality of sensing units 120 , a DC voltage supply unit 190 , and a signal processing unit 195 . . Each scan line 101 is used to transmit a corresponding scan signal. Each data line 102 is used to transmit corresponding data signals. Each pixel unit 105 is configured to control the writing operation of the corresponding data signal according to the corresponding scanning signal, thereby outputting the corresponding image signal. The DC voltage supply unit 190 is configured to provide a fixed high level driving voltage Vdh and a low level driving voltage Vdl to the complex sensing unit 120.

Each sensing unit 120 includes a first transistor 125, a second transistor 130, a third transistor 135, a capacitor 140, and a fourth transistor 150. In one embodiment, the first transistor 125 is a Photo-sensing Thin Film Transistor or a Photo-sensing Field Effect Transistor, and the second transistor 130 is a third. The transistor 135 and the fourth transistor 150 are thin film transistors or field effect transistors. In another embodiment, the second transistor 130 is a photo-induced thin film transistor or a photo-induced field-effect transistor, and the first transistor 125, the third transistor 135, and the fourth transistor 150 are thin film transistors or Field effect transistor. The gate voltage Vg is a partial voltage generated by the high-level driving voltage Vdh and the low-level driving voltage Vdl via the channel resistance of the first transistor 125 and the channel resistance of the second transistor 130, wherein the first transistor 125 The channel resistance or the channel resistance of the second transistor 130 is affected by the illumination. The third transistor 135 generates a sensing voltage Vsense according to the gate voltage Vg and the high level driving voltage Vdh, and the capacitor 140 is used to store the sensing voltage Vsense. As can be seen from the above, the sensing unit 120 can adjust the gate voltage Vg according to the light receiving state thereof, thereby adjusting the sensing voltage Vsense. The fourth transistor 150 outputs the sensing voltage Vsense as a corresponding read signal according to the scan signal transmitted by the corresponding scan line 101, and is fed to the signal processing unit 195 via the corresponding read line 110. The signal processing unit 195 is configured to perform signal processing on the plurality of read signals fed by the plurality of read lines 110, thereby generating a touch position signal Spos.

In the operation of the sensing unit 120, the first transistor 125, the second transistor 130, and the third transistor 135 are subjected to a fixed high-level driving voltage Vdh or a low level for a long time. The voltage stress applied by the bit driving voltage Vd1 is liable to cause component characteristic shift (such as a transistor threshold voltage shift). When the component characteristics of the first transistor 125 or the second transistor 130 are shifted, an error occurs in the generated gate voltage Vg, and the sensing voltage Vsense is also followed by an error, so that the signal processing unit 195 may generate The wrong touch position signal Spos. When the element characteristics of the third transistor 135 are shifted, even if the gate voltage Vg has no error, an error occurs in the generated sensing voltage Vsense, and the signal processing unit 195 may generate an erroneous touch position signal Spos. Note that if the first transistor 125, the second transistor 130, and the third transistor 135 are amorphous-Si thin film transistors, it is more likely to cause component characteristic shift under a fixed bias.

FIG. 2 is a schematic view showing a second embodiment of a display panel having a light sensing position function according to the present invention. As shown in FIG. 2, the display panel 200 includes a plurality of scan lines 201, a plurality of data lines 202, a plurality of pixel units 205, a plurality of read lines 210, a plurality of sensing units 220, a voltage supply unit 290, and a signal processing unit 295. Each scan line 201 is used to transmit a corresponding scan signal. Each data line 202 is used to transmit corresponding data signals. Each pixel unit 205 is electrically connected to the corresponding scan line 201 and the corresponding data line 202 for controlling the writing operation of the corresponding data signal according to the corresponding scan signal, thereby outputting the corresponding image signal. The pixel unit 205 may be a pixel unit based on liquid crystal display. The voltage supply unit 290 is configured to provide the first driving voltage Vc1 and the second driving voltage Vc2 to the complex sensing unit 220. FIG. 7 is a schematic diagram showing the timings of the first driving voltage Vc1 and the second driving voltage Vc2 provided by the voltage supply unit 290 in FIG. Each operation cycle of the sensing unit 220 includes a first time period and a second time period, the time length of the first time period is substantially equal to a frame period, and the time length of the second time period is also substantially equal to a frame period, the first time period The period of the first frame is substantially the period of the other frame, and the first driving voltage Vc1 is a high potential V ₂ in the period of the first frame and the third frame. The period of the second frame is the low potential V ₁ , and the second driving voltage Vc2 is the low potential V ₁ in the period of the first frame and the third frame, and the high potential V ₂ in the period of the second frame. The time length of the first time period is substantially equal to a frame period, and the time length of the second time period is also substantially equal to a frame period, the first time period is substantially a time period of one frame, and the second time period is substantially another During the period of a frame, the first driving voltage Vc1 is at a high potential V ₂ in the period of the first frame and the third frame, and the low period V ₁ in the period of the second frame, and the second driving voltage Vc2 is at The time period of the first frame and the third frame is low potential V ₁ , in the second frame The period is a high potential V ₂ , and the first driving voltage Vc1 is higher than the second driving voltage Vc2 in the first period, and the first driving voltage Vc1 is lower than the second driving voltage Vc2 in the second period. In an embodiment, the voltage supply unit 290 is configured to provide a first driving voltage Vc1 and a second driving voltage Vc2 that are alternating and mutually inverted, that is, when the first driving voltage Vc1 is a low level voltage, the second The driving voltage Vc2 is a high level voltage and vice versa. In another embodiment, the voltage supply unit 290 is configured to provide a first driving voltage Vc1 of the alternating current and a second driving voltage Vc2 of the direct current, wherein the high level voltage of the first driving voltage Vc1 is higher than the second driving voltage Vc2, And the low level voltage of the first driving voltage Vc1 is lower than the second driving voltage Vc2. In another embodiment, the voltage supply unit 290 is configured to provide a first driving voltage Vc1 of the direct current and a second driving voltage Vc2 of the alternating current, wherein the high level voltage of the second driving voltage Vc2 is higher than the first driving voltage Vc1, And the low level voltage of the second driving voltage Vc2 is lower than the first driving voltage Vc1.

In the embodiment shown in FIG. 2, each pixel unit 205 is adjacent to the sensing unit 220. In another embodiment, the sensing unit 220 can be disposed by spacing the plurality of scan lines 201, or by spacing the plurality of data lines 202, that is, not every pixel unit 205 is adjacent to the sensing unit 220. Similarly, the readout line 210 can be disposed correspondingly to the plurality of data lines 202. Each sensing unit 220 includes a first transistor 225, a second transistor 230, a third transistor 235, a capacitor 240, and a fourth transistor 250. In one embodiment, the first transistor 225 is a photo-induced thin film transistor or a photo-induced field-effect transistor, and the second transistor 230, the third transistor 235, and the fourth transistor 250 are thin film transistors or fields. Effect transistor. In another embodiment, the second transistor 230 is a photo-induced thin film transistor or a photo-induced field-effect transistor, and the first transistor 225, the third transistor 235, and the fourth transistor 250 are thin film transistors or Field effect transistor. The coupling unit and the operation principle of the circuit are described below according to the sensing unit DUN_m.

The channel resistance of the first transistor 225 or the channel resistance of the second transistor 230 may be adjusted according to its light receiving state to adjust the gate voltage VGn_m, thereby driving the third transistor 235. The third transistor 235 generates a sensing voltage VDn_m according to the gate voltage VGn_m and the first driving voltage Vc1, and the capacitor 240 is used to store the sensing voltage VDn_m. The fourth transistor 250 outputs the sensing voltage VDn_m as the read signal Sro_m according to the scan signal SSn transmitted by the scan line SLn, and feeds it to the signal processing unit 295 via the read line RLm. The signal processing unit 295 is configured to perform a signal on the complex read signal (for example, the read signal Sro_m fed by the read line RLm and the read signal Sro_j fed by the read line RLj) fed from the complex read line 210. Processing, according to which a touch position signal is generated Spos.

The first transistor 225 includes a first end, a second end and a gate terminal, wherein the first end is electrically connected to the voltage supply unit 290 to receive the first driving voltage Vc1, and the second end is electrically connected to the second transistor 230 and the third The transistor 235 has a gate terminal electrically connected to the second end of the first transistor 225. The second end of the first transistor 225 is used to provide a gate voltage VGn_m. The second transistor 230 includes a first end, a second end and a gate terminal, wherein the first end is electrically connected to the second end of the first transistor 225, and the second end and the gate terminal are both electrically connected to the voltage supply unit 290 for receiving The second driving voltage Vc2. The third transistor 235 includes a first end, a second end, and a gate terminal, wherein the first end is electrically connected to the voltage supply unit 290 to receive the first driving voltage Vc1, and the second end is electrically connected to the capacitor 240 and the fourth transistor 250. The gate is electrically connected to the second end of the first transistor 225 to receive the gate voltage VGn_m. The second end of the third transistor 235 is used to provide a sensing voltage VDn_m. The capacitor 240 includes a first end and a second end, wherein the first end is electrically connected to the second end of the third transistor 235, and the second end is electrically connected to the voltage supply unit 290 to receive the second driving voltage Vc2. The fourth transistor 250 includes a first end, a second end and a gate terminal, wherein the first end is electrically connected to the second end of the third transistor 235 to receive the sensing voltage VDn_m, and the gate terminal is electrically connected to the scan line SLn for receiving The scan signal SSn is electrically connected to the readout line RLm. The second end of the fourth transistor 250 is for outputting the read signal Sro_m to the read line RLm. In one embodiment, the capacitor 240 can be omitted, and the second end of the third transistor 235 and the second end of the second transistor 230 are open. In another embodiment, the fourth transistor 250 can be omitted, and the second end of the third transistor 235 is directly connected to the sense line RLm, that is, the sense provided by the second end of the third transistor 235. Measuring electricity The voltage VDn_m is directly output as the read signal Sro_m.

In the operation of the sensing unit DUn_m, since the first transistor 225 and the second transistor 230 are in accordance with the light receiving state of the sensing unit DUn_m, the first driving voltage Vc1 and the second driving voltage Vc2 are coupled to each other and are mutually inverted. To provide the gate voltage VGn_m. That is to say, the first transistor 225 and the second transistor 230 do not withstand the voltage stress applied by the fixed high-level voltage or the low-level voltage for a long time, so that the first transistor 225 and the second transistor can be avoided. 230 occurs in the characteristic shift of the component, thereby avoiding an error in the generated gate voltage VGn_m. In addition, the third transistor 235 is driven by the gate voltage VGn_m and the first driving voltage Vc1 to generate the sensing voltage VDn_m, and the gate voltage VGn_m and the first driving voltage Vc1 are both AC voltages, so the third power The crystal 235 also does not withstand the voltage stress applied by the fixed high-level voltage for a long time, so that the element characteristic shift phenomenon of the third transistor 235 can be avoided, thereby avoiding the error of the generated read signal Sro_m. In summary, in the operation of the display panel 200, the plurality of sensing units 220 can provide accurate complex read signals according to the light receiving state for a long time, so that the signal processing unit 295 can generate an accurate touch position signal Spos.

FIG. 3 is a schematic view showing a third embodiment of a display panel having a light sensing position function according to the present invention. As shown in FIG. 3, the display panel 300 is similar to the display panel 200 shown in FIG. 2, and the main difference is that the voltage supply unit 290 is replaced with the voltage supply unit 390, and the complex sensing unit 220 is replaced with a complex sense. The unit 320, wherein the sensing unit DUn_m is replaced with the sensing unit DWn_m. The voltage supply unit 390 is used To provide the AC drive voltage Vc3. Each sensing unit 320 includes a first transistor 325, a second transistor 330, a third transistor 335, a capacitor 340, and a fourth transistor 350, wherein the first transistor 325 is a light-sensitive thin film transistor or light. Inductive field effect transistors, the second transistor 330, the third transistor 335 and the fourth transistor 350 are thin film transistors or field effect transistors. The sensing unit DWn_m is used to describe the coupling relationship between the components and the circuit operation principle.

The gate voltage VGn_m is a partial voltage generated by the AC drive voltage Vc3 and the scan signal SSn+1 via the channel resistance of the first transistor 325 and the channel resistance of the second transistor 330, wherein the channel resistance of the first transistor 325 is The gate voltage VGn_m can be adjusted according to the light receiving state of the channel resistance of the first transistor 325. The third transistor 335 generates a sensing voltage VDn_m according to the gate voltage VGn_m and the alternating current driving voltage Vc3, and the capacitor 340 is used to store the sensing voltage VDn_m. The fourth transistor 350 outputs the sensing voltage VDn_m as the read signal Sro_m according to the scan signal SSn, and feeds it to the signal processing unit 295 via the read line RLm.

The first transistor 325 includes a first end, a second end, and a gate terminal, wherein the first end is electrically connected to the voltage supply unit 390 to receive the AC driving voltage Vc3, and the second end is electrically connected to the second transistor 330 and the third electrode. The crystal 335 has a gate terminal electrically connected to the second end of the first transistor 325. The second end of the first transistor 325 is used to provide a gate voltage VGn_m. The second transistor 330 includes a first end, a second end, and a gate terminal, wherein the first end is electrically connected to the second end of the first transistor 325, and the second end and the gate terminal are electrically connected to the scan line SLn+1. The scanning signal SSn+1 is received. The third transistor 335 includes a first end, The second end is connected to the gate terminal, wherein the first end is electrically connected to the voltage supply unit 390 to receive the AC driving voltage Vc3, the second end is electrically connected to the capacitor 340 and the fourth transistor 350, and the gate terminal is electrically connected to the first transistor 325. The second end receives the gate voltage VGn_m. The second end of the third transistor 335 is used to provide a sensing voltage VDn_m. The capacitor 340 includes a first end and a second end, wherein the first end is electrically connected to the second end of the third transistor 335, and the second end is electrically connected to the scan line SLn+1 to receive the scan signal SSn+1. The fourth transistor 350 includes a first end, a second end and a gate terminal, wherein the first end is electrically connected to the second end of the third transistor 335 to receive the sensing voltage VDn_m, and the gate terminal is electrically connected to the scan line SLn for receiving The scan signal SSn is electrically connected to the readout line RLm. The second end of the fourth transistor 350 is for outputting the read signal Sro_m to the read line RLm. In one embodiment, the capacitor 340 can be omitted, and the second end of the third transistor 335 and the second end of the second transistor 330 are open. In another embodiment, the fourth transistor 350 can be omitted, and the second end of the third transistor 335 is directly connected to the sense line RLm, that is, the sense provided by the second end of the third transistor 335. The measured voltage VDn_m is directly output as the read signal Sro_m.

The operation period of the sensing unit DWn_m includes a first period and a second period, the scanning signal SSn+1 is higher than the AC driving voltage Vc3 in the first period, and the scanning signal SSn+1 is lower than the AC driving voltage in the second period Vc3. The scan signal SSn+1 includes a periodic positive pulse or a periodic negative pulse. If the scan signal SSn+1 includes a periodic positive pulse wave, the pulse wave period of the scan signal SSn+1 corresponds to the low level period of the AC drive voltage Vc3. If the scan signal SSn+1 includes a periodic negative pulse wave, the pulse wave period of the scan signal SSn+1 corresponds to the high-level period of the AC drive voltage Vc3. Display panel 300 The remaining electrical connection relationship and functional operation are similar to the display panel 200, and will not be described again.

4 is a schematic view showing a fourth embodiment of a display panel having a light sensing position function according to the present invention. As shown in FIG. 4, the display panel 400 is similar to the display panel 300 shown in FIG. 3, and the main difference is that the complex sensing unit 320 is replaced with a complex sensing unit 420, wherein the sensing unit DWn_m is replaced with a sense. Measuring unit DXn_m. The sensing unit DXn_m is similar to the sensing unit DWn_m, the main difference being that the second transistor 330 is replaced with the second transistor 430, and the capacitor 340 is replaced by the capacitor 440. The second transistor 430 is a thin film transistor or a field effect transistor. The second transistor 430 includes a first end, a second end and a gate terminal, wherein the first end is electrically connected to the second end of the first transistor 325, and the second end and the gate terminal are electrically connected to the scan line SLn for receiving the scan. Signal SSn. The capacitor 440 includes a first end and a second end, wherein the first end is electrically connected to the second end of the third transistor 335, and the second end is electrically connected to the scan line SLn to receive the scan signal SSn. The operation period of the sensing unit DXn_m includes a first period and a second period, the scanning signal SSn is higher than the AC driving voltage Vc3 in the first period, and the scanning signal SSn is lower than the AC driving voltage Vc3 in the second period. The scan signal SSn contains a periodic positive pulse or a periodic negative pulse. If the scan signal SSn includes a periodic positive pulse wave, the pulse wave period of the scan signal SSn corresponds to a low level period of the AC drive voltage Vc3. If the scan signal SSn includes a periodic negative pulse wave, the pulse wave period of the scan signal SSn corresponds to the high level period of the AC drive voltage Vc3. The remaining electrical connection relationship and function operation of the display panel 400 are similar to those of the display panel 300, and will not be described again.

FIG. 5 is a fifth embodiment of a display panel with a light sensing position function according to the present invention. intention. As shown in FIG. 5, the display panel 500 is similar to the display panel 200 shown in FIG. 2, and the main difference is that the voltage supply unit 290 is replaced with the voltage supply unit 590, and the complex sensing unit 220 is replaced with a complex sense. Unit 520, wherein the sensing unit DUn_m is replaced with a sensing unit DYn_m. The voltage supply unit 590 is for providing an AC drive voltage Vc4. Each sensing unit 520 includes a first transistor 525, a second transistor 530, a third transistor 535, a capacitor 540, and a fourth transistor 550, wherein the second transistor 530 is a light-sensitive thin film transistor or light. Inductive field effect transistors, the first transistor 525, the third transistor 535 and the fourth transistor 550 are thin film transistors or field effect transistors. The sensing unit DYn_m is used to describe the coupling relationship between the components and the circuit operation principle.

The gate voltage VGn_m is a partial voltage generated by the channel resistance of the scan signal SSn and the AC drive voltage Vc4 via the channel resistance of the first transistor 525 and the channel resistance of the second transistor 530, wherein the channel resistance of the second transistor 530 is illuminated. The influence, that is, the gate voltage VGn_m can be adjusted according to the light receiving state of the channel resistance of the second transistor 530. The third transistor 535 generates a sensing voltage VDn_m according to the gate voltage VGn_m and the scanning signal SSn, and the capacitor 540 is used to store the sensing voltage VDn_m. The fourth transistor 550 outputs the sensing voltage VDn_m as the read signal Sro_m according to the scan signal SSn, and feeds it to the signal processing unit 295 via the read line RLm.

The first transistor 525 includes a first end, a second end and a gate terminal, wherein the first end is electrically connected to the scan line SLn to receive the scan signal SSn, and the second end is electrically connected to the second transistor 530 and the third transistor 535. The gate is electrically connected to the second of the first transistor 525 end. The second end of the first transistor 525 is used to provide a gate voltage VGn_m. The second transistor 530 includes a first end, a second end and a gate terminal, wherein the first end is electrically connected to the second end of the first transistor 525, and the second end and the gate terminal are both electrically connected to the voltage providing unit 590 for receiving AC drive voltage Vc4. The third transistor 535 includes a first end, a second end and a gate terminal, wherein the first end is electrically connected to the scan line SLn to receive the scan signal SSn, and the second end is electrically connected to the capacitor 540 and the fourth transistor 550, the gate terminal It is electrically connected to the second end of the first transistor 525 to receive the gate voltage VGn_m. The second end of the third transistor 535 is used to provide a sensing voltage VDn_m. The capacitor 540 includes a first end and a second end, wherein the first end is electrically connected to the second end of the third transistor 535, and the second end is electrically connected to the voltage supply unit 590 to receive the AC driving voltage Vc4. The fourth transistor 550 includes a first end, a second end and a gate terminal, wherein the first end is electrically connected to the second end of the third transistor 535 to receive the sensing voltage VDn_m, and the gate terminal is electrically connected to the scan line SLn for receiving The scan signal SSn is electrically connected to the readout line RLm. The second end of the fourth transistor 550 is for outputting the read signal Sro_m to the read line RLm. In one embodiment, the capacitor 540 can be omitted, and the second end of the third transistor 535 and the second end of the second transistor 530 are open. In another embodiment, the fourth transistor 550 can be omitted, and the second end of the third transistor 535 is directly connected to the sense line RLm, that is, the sense provided by the second end of the third transistor 535. The measured voltage VDn_m is directly output as the read signal Sro_m.

The operation period of the sensing unit DYn_m includes a first period and a second period, the scanning signal SSn is higher than the AC driving voltage Vc4 in the first period, and the scanning signal SSn is lower than the AC driving voltage Vc4 in the second period. Scan signal SSn contains periodic positive Pulse wave or periodic negative pulse wave. If the scan signal SSn includes a periodic positive pulse wave, the pulse wave period of the scan signal SSn corresponds to a low level period of the AC drive voltage Vc4. If the scan signal SSn includes a periodic negative pulse wave, the pulse wave period of the scan signal SSn corresponds to the high level period of the AC drive voltage Vc4. The remaining electrical connection relationship and function operation of the display panel 500 are similar to those of the display panel 200, and will not be described again.

Fig. 6 is a view showing a sixth embodiment of the display panel having the light sensing position function of the present invention. As shown in FIG. 6, the display panel 600 is similar to the display panel 500 shown in FIG. 5, and the main difference is that the complex sensing unit 520 is replaced with a complex sensing unit 620, wherein the sensing unit DYn_m is replaced with a sense. Measuring unit DZn_m. The sensing unit DZn_m is similar to the sensing unit DYn_m, the main difference being that the first transistor 525 is replaced with the first transistor 625, and the third transistor 535 is replaced with the third transistor 635. The first transistor 625 and the third transistor 635 are thin film transistors or field effect transistors. The first transistor 625 includes a first end, a second end, and a gate terminal, wherein the first end is electrically connected to the scan line SLn+1 to receive the scan signal SSn+1, and the second end and the gate terminal are electrically connected to the second The first end of the crystal 530. The third transistor 635 includes a first end, a second end, and a gate terminal, wherein the first end is electrically connected to the scan line SLn+1 to receive the scan signal SSn+1, and the second end is electrically connected to the fourth transistor 550. At one end, the gate is electrically connected to the second end of the first transistor 625. The operation period of the sensing unit DZn_m includes a first period and a second period, the scanning signal SSn+1 is higher than the AC driving voltage Vc4 in the first period, and the scanning signal SSn+1 is lower than the AC driving voltage in the second period Vc4. The scan signal SSn+1 includes a periodic positive pulse or a periodic negative pulse. If the scanning signal SSn+1 includes a periodic positive pulse wave, the pulse wave period of the scanning signal SSn+1 is It should be at the low level of the AC drive voltage Vc4. If the scan signal SSn+1 includes a periodic negative pulse wave, the pulse wave period of the scan signal SSn+1 corresponds to the high level period of the AC drive voltage Vc4. The remaining electrical connection relationship and functional operation of the display panel 600 are similar to those of the display panel 500, and will not be described again.

In summary, in the operation of the display panel with the light sensing position function of the present invention, the sensing unit is driven by at least one AC driving voltage provided by the voltage providing unit, that is, the plurality of electric powers included in the sensing unit. The crystals are not subjected to a fixed bias stress for a long time, so as to avoid the occurrence of component characteristic shift in each of the transistors, thereby avoiding errors in the read signals received by the signal processing unit. In other words, the plurality of sensing units of the display panel can provide an accurate complex read signal according to the light receiving state for a long time, so that the signal processing unit can generate an accurate touch position signal.

While the present invention has been described above by way of example, it is not intended to limit the invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

100, 200, 300, 400, 500, 600‧‧‧ display panels

101, 201‧‧‧ scan lines

102, 202‧‧‧ data line

105, 205‧‧ ‧ pixel unit

110, 210‧‧‧ readout lines

120, 220, 320, 420, 520, 620‧ ‧ sensing unit

125, 225, 325, 525, 625‧‧ First transistor

130, 230, 330, 430, 530‧‧‧ second transistor

135, 235, 335, 535, 635‧‧‧ third transistor

140, 240, 340, 440, 540‧‧ ‧ capacitors

150, 250, 350, 550‧‧‧ fourth transistor

190‧‧‧DC voltage supply unit

195, 295‧‧‧ signal processing unit

290, 390, 590‧‧‧ voltage supply unit

DUn_m, DWn_m, DXn_m, DYn_m, DZn_m‧‧‧ sensing unit

RLj, RLm‧‧‧ readout line

SLn, SLn+1‧‧‧ scan line

Spos‧‧‧Touch position signal

Sro_j, Sro_m‧‧‧ read signal

SSn, SSn+1‧‧‧ scan signal

Vc1‧‧‧ first drive voltage

Vc2‧‧‧second drive voltage

Vc3, Vc4‧‧‧ AC drive voltage

Vdh‧‧‧ high level drive voltage

Vdl‧‧‧low level drive voltage

Vg, VGn_m‧‧‧ gate voltage

Vsense, VDn_m‧‧‧ sense voltage

V1‧‧‧ low potential

V2‧‧‧ high potential

FIG. 1 is a schematic view showing a first embodiment of a display panel having a light sensing position function according to the present invention.

2 is a second embodiment of a display panel with a light sensing position function according to the present invention. intention.

FIG. 3 is a schematic view showing a third embodiment of a display panel having a light sensing position function according to the present invention.

4 is a schematic view showing a fourth embodiment of a display panel having a light sensing position function according to the present invention.

FIG. 5 is a schematic view showing a fifth embodiment of a display panel having a light sensing position function according to the present invention.

Fig. 6 is a view showing a sixth embodiment of the display panel having the light sensing position function of the present invention.

FIG. 7 is a schematic diagram showing the timings of the first driving voltage Vc1 and the second driving voltage Vc2 provided by the voltage supply unit of FIG. 2 in the period of three frames.

200. . . Display panel

201. . . Scanning line

202. . . Data line

205. . . Pixel unit

210. . . Readout line

220. . . Sensing unit

225. . . First transistor

230. . . Second transistor

235. . . Third transistor

240. . . capacitance

250. . . Fourth transistor

295. . . Signal processing unit

290. . . Voltage supply unit

DUn_m. . . Sensing unit

RLj, RLm. . . Readout line

SLn, SLn+1. . . Scanning line

Spos. . . Touch position signal

Sro_j, Sro_m. . . Read signal

SSn, SSn+1. . . Scanning signal

Vc1. . . First drive voltage

Vc2. . . Second drive voltage

VGn_m. . . Gate voltage

VDn_m. . . Sense voltage

Claims (20)

A display panel with a light sensing position function, comprising: a voltage supply unit for providing a first driving voltage and a second driving voltage; and a sensing unit electrically connected to the voltage providing unit for Providing a first read signal, the sensing unit includes: a first transistor, including a first end, a second end, and a gate terminal, wherein the first end of the first transistor is electrically connected to the voltage Providing a unit to receive the first driving voltage, a second end of the first transistor is electrically connected to a gate end of the first transistor; a second transistor includes a first end, a second end, and a gate Extremely, wherein the first end of the second transistor is electrically connected to the second end of the first transistor, and the second end of the second transistor is electrically connected to the gate terminal to the voltage providing unit to receive the second driving And a third transistor comprising a first end, a second end and a gate terminal, wherein the first end of the third transistor is electrically connected to the voltage supply unit to receive the first driving voltage, The gate of the third transistor is electrically connected to the gate a second end of the transistor, the second end of the third transistor is configured to output the first read signal; wherein each operation cycle of the sensing unit includes a first time period and a second time period, the first a driving voltage is higher than the second driving voltage in the first period, the first driving voltage being lower than the second in the second period Drive voltage. The display panel of claim 1, wherein: the first electro-crystal system is a photo-inductive thin film transistor or a photo-sensing field-effect transistor; and the second electro-optic crystal and the third electro-crystalline system are thin film Crystal or field effect transistor. The display panel of claim 1, wherein: the second electro-crystal system is a photo-induced thin film transistor or a photo-induced field-effect transistor; and the first transistor and the third electro-crystal system are thin film Crystal or field effect transistor. The display panel of claim 1, further comprising: a capacitor comprising a first end and a second end, wherein the first end of the capacitor is electrically connected to the second end of the third transistor, the capacitor The second end is electrically connected to the second end of the second transistor. The display panel of claim 1, further comprising: a scan line for transmitting a scan signal; a first read line for transmitting the first read signal; and a fourth transistor comprising a a first end, a second end and a gate terminal, wherein the first end of the fourth transistor is electrically connected to the second end of the third transistor, and the gate terminal of the fourth transistor is electrically connected to the scan line To receive the scan signal, the The second end of the fourth transistor is electrically connected to the first readout line; wherein the fourth electro-crystalline system is a thin film transistor or a field effect transistor. The display panel of claim 5, further comprising: a data line for transmitting a data signal; and a pixel unit electrically connected to the scan line and the data line for using the scan signal and the data Signal to output an image signal. The display panel of claim 5, further comprising: a second read line for transmitting a second read signal; and a signal processing unit electrically connected to the first read line and the second read The outgoing line is configured to perform signal processing on the first read signal and the second read signal to generate a touch position signal. The display panel of claim 1, wherein the voltage providing unit is configured to provide the first driving voltage and the second driving voltage that are alternating and mutually inverted. The display panel of claim 1, wherein the voltage supply unit is configured to provide the first driving voltage of the alternating current and the second driving voltage of the direct current, wherein the high level voltage of the first driving voltage is higher than the first And driving the voltage, and the low level voltage of the first driving voltage is lower than the second driving voltage. The display panel of claim 1, wherein the voltage providing unit is configured to provide The first driving voltage of the direct current and the second driving voltage of the alternating current, wherein the high level voltage of the second driving voltage is higher than the first driving voltage, and the low level voltage of the second driving voltage is lower than the first driving voltage A drive voltage. A display panel with a light sensing position function, comprising: a voltage supply unit for providing an alternating current driving voltage; a first scanning line for transmitting a first scanning signal having a periodic pulse wave; and a The sensing unit is electrically connected to the voltage supply unit and the first scan line for providing a read signal. The sensing unit includes: a first transistor, including a first end, a second end, and a first a gate terminal, wherein the first end of the first transistor is electrically connected to the voltage supply unit to receive the AC driving voltage, and the second end of the first transistor is electrically connected to the gate terminal of the first transistor; The second transistor includes a first end, a second end and a gate terminal, wherein the first end of the second transistor is electrically connected to the second end of the first transistor, and the second transistor is second The terminal and the gate are electrically connected to the first scan line to receive the first scan signal; and a third transistor includes a first end, a second end and a gate terminal, wherein the third transistor is One end is electrically connected to the voltage supply unit to receive the Current drive voltage, the gate terminal of the third transistor is electrically connected to the second terminal of the first transistor, the second terminal of the crystal of the third electrical output to the read signal; Each operation cycle of the sensing unit includes a first time period and a second time period. The first scanning signal is higher than the AC driving voltage in the first time period, and the first scanning signal is in the second time period. The internal system is lower than the AC drive voltage. The display panel of claim 11, wherein: the first electro-crystal system is a photo-induced thin film transistor or a photo-induced field-effect transistor; and the second electro-optic crystal and the third electro-crystalline system are thin film Crystal or field effect transistor. The display panel of claim 11, further comprising: a capacitor comprising a first end and a second end, wherein the first end of the capacitor is electrically connected to the second end of the third transistor, the capacitor The second end is electrically connected to the second end of the second transistor. The display panel of claim 11, further comprising: a readout line for transmitting the read signal; a fourth transistor comprising a first end, a second end and a gate end, wherein the The first end of the fourth transistor is electrically connected to the second end of the third transistor, and the gate of the fourth transistor is electrically connected to the first scan line to receive the first scan signal, and the fourth transistor a second end electrically connected to the readout line; a data line for transmitting a data signal; and a pixel unit electrically connected to the first scan line and the data line for The first scan signal and the data signal output an image signal; wherein the fourth electro-crystal system is a thin film transistor or a field effect transistor. The display panel of claim 11, further comprising: a second scan line for transmitting a second scan signal having a periodic pulse wave; a read line for transmitting the read signal; The transistor includes a first end, a second end and a gate terminal, wherein the first end of the fourth transistor is electrically connected to the second end of the third transistor, and the gate of the fourth transistor is electrically Connecting to the second scan line to receive the second scan signal, the second end of the fourth transistor is electrically connected to the read line; a data line for transmitting a data signal; and a pixel unit, The second scan line and the data line are connected to output an image signal according to the second scan signal and the data signal. A display panel with a light sensing position function, comprising: a voltage supply unit for providing an alternating current driving voltage; a first scanning line for transmitting a first scanning signal having a periodic pulse wave; and a The sensing unit is electrically connected to the voltage supply unit and the first scan line for providing a read signal. The sensing unit includes: a first transistor, including a first end, a second end, and a first a gate terminal, wherein the first end of the first transistor is electrically connected to the first scan line to receive the first scan signal, and the second end of the first transistor is electrically connected to the gate a gate of the first transistor; a second transistor comprising a first end, a second end and a gate terminal, wherein the first end of the second transistor is electrically connected to the second transistor The second end of the second transistor is electrically connected to the voltage supply unit to receive the AC driving voltage, and a third transistor includes a first end, a second end and a gate terminal. The first end of the third transistor is electrically connected to the first scan line to receive the first scan signal, and the gate end of the third transistor is electrically connected to the second end of the first transistor, the third The second end of the transistor is configured to output the read signal; wherein each operation cycle of the sensing unit includes a first time period and a second time period, and the first scan signal is higher than the first time period The AC driving voltage is lower than the AC driving voltage during the second period of time. The display panel of claim 16, wherein: the second electro-crystal system is a photo-induced thin film transistor or a photo-induced field-effect transistor; and the first transistor and the third electro-crystal system are thin film Crystal or field effect transistor. The display panel of claim 16, further comprising: a capacitor comprising a first end and a second end, wherein the first end of the capacitor is electrically connected to the second end of the third transistor, the capacitor The second end is electrically connected to the first The second end of the second transistor. The display panel of claim 16, further comprising: a readout line for transmitting the read signal; a fourth transistor comprising a first end, a second end and a gate extremity, wherein the The first end of the fourth transistor is electrically connected to the second end of the third transistor, and the gate of the fourth transistor is electrically connected to the first scan line to receive the first scan signal, and the fourth transistor The second end is electrically connected to the readout line; a data line is used for transmitting a data signal; and a pixel unit is electrically connected to the first scan line and the data line for using the first scan signal and The data signal outputs an image signal; wherein the fourth electro-crystal system is a thin film transistor or a field effect transistor. The display panel of claim 16, further comprising: a second scan line for transmitting a second scan signal having a periodic pulse wave; a read line for transmitting the read signal; The transistor includes a first end, a second end and a gate terminal, wherein the first end of the fourth transistor is electrically connected to the second end of the third transistor, and the gate of the fourth transistor is electrically Connecting to the second scan line to receive the second scan signal, the second end of the fourth transistor is electrically connected to the read line; a data line for transmitting a data signal; and a pixel unit, The second scan line and the data line are connected to output an image signal according to the second scan signal and the data signal.