TWI611332B - Touch display panel - Google Patents

Abstract

A touch sensing display panel includes a touch sensing layer, an active element array substrate, and a switch unit. The touch sensing layer includes a plurality of touch sensing units, and each touch sensing unit is electrically connected to a conductive wire. The active device array substrate is disposed opposite to the touch sensing layer, and the active device array substrate includes a plurality of data lines. The switch unit includes a plurality of switches. One end of each switch is electrically connected to at least one of the conductive lines, and the other end is electrically connected to at least one of the data lines. Wherein, during the touch sensing period, the switch is in a conducting state.

Description

Touch sensing display panel

The invention relates to a touch sensing panel technology, in particular to a touch sensing display panel.

The touch-sensing unit often used in in-cell touch is composed of a capacitive touch sensor and a back-end processing circuit. The capacitive touch sensor is used to The touch of the user is sensed, and the back-end processing circuit judges a touch event based on the output signal of the capacitive touch sensor. However, in the current structure, the capacitive touch sensor will have a large area overlap with the pixel array (or active element array substrate) of the panel, which will increase the parasitic capacitance and reduce the capacitive touch sensing. Sensor's inductive sensitivity.

At present, there are ways to reduce the parasitic capacitance by outputting the same driving waveform to the capacitive touch sensor and the active element array substrate. The method of outputting the same drive waveform ideally can completely reduce the value of the degeneration capacitor. However, in practical applications, the difference between the RC loading at the far and near ends of the panel will cause the signal to be sent to the capacitive touch sensor and The waveform at the far end of the active element array substrate cannot be completely consistent, and the mismatch between the far-end and near-end resistance-capacitance loads will cause its poor effect.

In order to improve the above disadvantages, the present invention provides a touch-sensing display panel, which includes a touch-sensing layer, an active element array substrate, and a switch unit. The touch sensing layer includes a plurality of touch sensing units, and each touch sensing unit is electrically connected to a conductive wire. The active device array substrate is disposed opposite to the touch sensing layer, and the active device array substrate includes a plurality of data lines. The switch unit includes a plurality of switches. One end of each switch is electrically connected to at least one of the conductive lines, and the other end is electrically connected to at least one of the data lines. Wherein, during the touch sensing period, the switch is in a conducting state.

The present invention also provides a touch-sensing display panel, which includes a touch-sensing layer, an active element array substrate, and at least one multiplexer.

The touch sensing layer includes a plurality of touch sensing units, and each touch sensing unit is electrically connected to a conductive wire. The active device array substrate is disposed opposite to the touch sensing layer. The active device array substrate includes a plurality of data lines. Each multiplexer has a first end, a second end, and a selection end. Each first end is electrically connected to at least one of the conductive lines, and each second end is electrically connected to at least one of the data lines. The first end and the second end of each multiplexer for touch sensing are used for conducting during the touch sensing period.

The touch-sensing display panel of the present invention uses the data lines of the active element array substrate and the conductive lines of the touch-sensing layer to be short-circuited during touch-sensing sensing to eliminate parasitic capacitance therein, and can reduce The noise caused by the difference in the sheet resistance of the conductive wires further improves the touch sensing sensitivity. In addition, by short-circuiting the data line with the conductive line, the resistance value of the conductive line is also greatly reduced, thereby reducing the thrust load of the processing unit. Furthermore, the power consumed during the touch sensing only needs to provide the processing unit to output pulse signals to the conductive lines, thereby saving power. In addition, the touch-sensing display panel of the present invention can also increase the stability by connecting conductive lines to a common potential during display, reduce the ripple caused by the coupling signal of the data lines, and improve the stability of the touch-sensing display panel degree.

FIG. 1 is a schematic diagram of a touch sensing display panel 100 according to a first embodiment of the present invention. Referring to FIG. 1, the touch-sensing display panel 100 includes a touch-sensing layer 10, an active element array substrate 20, a switching unit 30 and a processing unit 40. The touch sensing layer 10 includes a plurality of touch sensing units 11, and each touch sensing unit 11 is electrically connected to the conductive wire 12. The active device array substrate 20 is disposed opposite to the touch sensing layer 10. The active device array substrate 20 includes a plurality of data lines 21. FIG. 2 is a schematic circuit structure diagram of a switch 31 connecting a conductive line 12 and a data line 21 according to an embodiment of the present invention. Please refer to FIG. 2, each touch sensing unit 11 corresponds to a plurality of pixels of the active device array substrate 20 (as shown in block 22), and each conductive line 12 electrically connected to each touch sensing unit 11 is electrically connected. Generally parallel to at least one of the data lines 21, the conductive line 12 electrically connected to each touch sensing unit 11 is electrically connected to a common potential Vcom of at least one of the pixels.

Please refer to FIG. 1 and FIG. 2 together. The switch unit 30 includes a plurality of switches 31. One end of each switch 31 is electrically connected to at least one of the conductive wires 12, and the other end is electrically connected to at least one of the data wires. One. In the embodiment of the present invention, the data line 21 and the conductive line 12 are connected to the processing unit 40, and the processing unit 40 uses the data line 21 to provide data to the picture of the active device array substrate 20 during the display of the touch sensing display panel 100. The processing unit 40 detects touch sensing events with the conductive lines 12 connected to the touch sensing unit 11 during the touch sensing of the touch sensing display panel 100. In addition, the processing unit 40 is electrically connected to the switching unit 30, and the processing unit 40 sends a control signal S to the switching unit 30 during the touch sensing, so that the switch 31 is in a conducting state, so that the data line 21 and the conductive line 12 are short-circuited. Therefore, no parasitic capacitance is generated between the data line 21 and the conductive line 12 during touch sensing. In addition, the resistance value of the conductive wire 12 can be greatly reduced, and the thrust load of the processing unit 40 is reduced. Furthermore, during the touch sensing period, the consumed power only needs to provide the processing unit 40 to output a pulse signal to the conductive lines 12 connected to the touch sensing units 11 without outputting a pulse signal to each data line 21.

In one embodiment, the active device array substrate 20 has a display area 50 and a peripheral area 60 adjacent to the display area 50. The switch unit 30 and the processing unit 40 can be disposed on the same side of the peripheral area 60. Specifically, both the processing unit 40 and the switching unit 30 may be disposed below the active device array substrate 20 in the peripheral region 60.

In another embodiment, the switch unit 30 is disposed in the peripheral area 60, and the processing unit 40 and the switch unit 30 are disposed on opposite sides of the display area 50 as the center. For example, the processing unit 40 and the switch unit 30 may be respectively disposed on the upper and lower sides of the display area 50 as the center.

FIG. 3 is a schematic diagram of a touch-sensing display panel 200 according to a second embodiment of the present invention. The circuit operation of the touch-sensing display panel 200 is substantially the same as that of the touch-sensing display panel 100 of the first embodiment, except that the processing unit 40 and the switch unit 30 are respectively disposed on the upper and lower sides with the display area 50 as the center. side. In addition, the touch-sensing display panel 200 may further include a multiplexer 80, but this is not intended to limit the present invention. A display panel designer may decide whether to use the multiplexer 80 according to different panel designs. Please refer to FIG. 3 for touch sensing. When the processing unit 40 is disposed on a different side from the switch unit 30, considering the difference between the RC loading of the far and near ends of the panel, the RC loading The difference will be smaller than that the switch unit 30 and the processing unit 40 are disposed on the same side in the peripheral area 60. In some embodiments, the multiplexer 80 may be electrically connected to the processing unit 40 at one end and electrically connected to the pixels of the active device array substrate 20 through the data line 21 at the other end. Since a person skilled in the art can know that a multiplexer can be added between the pixels of the source driving unit and the pixels of the active element array substrate, the processing unit 40 and the active element array substrate of the present invention are not described in detail here. How to add the multiplexer 80 between the pixels.

FIG. 4 is a schematic circuit diagram of a switch connecting a conductive line and a data line according to another embodiment of the present invention. Please refer to FIG. 4. In the embodiment of the present invention, the processing unit 40 may further include an amplifier 41 and an amplifier 42. The amplifier 41 is electrically connected to the multiplexer 80 and provides data to the active device array substrate 20 through the data line 21. Pixels (as shown in block 22). Each touch sensing unit 11 corresponds to a pixel block 22 of a portion of the active device array substrate 20, and the conductive line 12 electrically connected to each touch sensing unit 11 is also electrically connected to another conductive line 13, and The conductive line 12 and the conductive line 13 are electrically connected to the amplifier 42 inside the processing unit 40. The connection of the conductive line 12 and the conductive line 13 of the touch sensing unit 11 through the amplifier 42 can reduce the thrust load of the processing unit 40.

FIG. 5 is a schematic diagram of a touch-sensing display panel 300 according to a third embodiment of the present invention. FIG. 6 is a schematic circuit diagram of a multiplexer 71 connecting a conductive line and a data line according to an embodiment of the present invention. In the third embodiment of the present invention, the multiplexer 71 is used to replace the switching unit described in the previous embodiment, and the same reference characters in the drawings refer to the same elements. The multiple multiplexers 71 in FIG. 6 can be integrated into the multiplexer array 70 shown in FIG. 5. In addition, the touch-sensing display panel 300 may further include a multiplexer 80, but this is not intended to limit the present invention. A display panel designer may decide whether to use the multiplexer 80 according to different panel designs.

Please refer to FIG. 5 and FIG. 6 together. Each multiplexer 71 has a first end 711, a second end 712, and a selection end 714. Each first end 711 is electrically connected to at least one of the conductive wires 12 and / or the conductive wires 13. First, each second end 712 is electrically connected to at least one of the data lines 21. The processing unit 40 is electrically connected to the selection terminals 714, and the processing unit 40 sends a control signal S to the selection terminal 714 during the touch sensing, so that the first terminal 711 and the second terminal 712 of the multiplexer 71 are turned on Therefore, the data line 21 and the conductive line 12 or / and the conductive line 13 are short-circuited, so no parasitic capacitance is generated between the data line 21 and the conductive line 12 during touch sensing.

In some embodiments, the multiplexer 71 further has a third terminal 713. The third terminal 713 is electrically connected to the common potential Vcom. The processing unit 40 turns on the first terminal 711 and the third terminal 713 of the multiplexer 71 during the display period. . That is, during the display of the touch-sensing display panel 100 by the processing unit 40, all the conductive lines are connected to the common potential Vcom by the multiplexer 71, wherein the common potential Vcom can be located at the ILB (internal pin) of the processing unit 40. Bonding) or OLB (Outer Pin Bonding), to increase the stability of the common potential Vcom of the touch-sensing display panel 100, reduce the ripple caused by the data line signal coupling of the active device array substrate, and improve the touch Controls the stability of the display panel 100.

The touch-sensing display panel of the present invention uses the data lines of the active element array substrate and the conductive lines of the touch-sensing layer to be short-circuited during touch-sensing sensing to eliminate parasitic capacitance therein, and can reduce The noise caused by the difference in the sheet resistance of the conductive wires further improves the touch sensing sensitivity. In addition, by short-circuiting the data line with the conductive line, the resistance value of the conductive line is also greatly reduced, thereby reducing the thrust load of the processing unit. Furthermore, the power consumed during the touch sensing only needs to provide the processing unit to output pulse signals to the conductive lines, thereby saving power. In addition, the touch-sensing display panel of the present invention can also increase the stability by connecting conductive lines to a common potential during display, reduce the ripple caused by the coupling signal of the data lines, and improve the stability of the touch-sensing display panel degree.

Although the present invention has been disclosed in the preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art can make some modifications and retouches without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall be determined by the scope of the attached patent application.

100, 200, 300‧‧‧ touch sensing display panel

10‧‧‧ touch sensing layer

11‧‧‧ touch sensing unit

12, 13‧‧‧ Conductive wire

20‧‧‧ Active Element Array Substrate

21‧‧‧data line

22‧‧‧block

30‧‧‧ switch unit

31‧‧‧Switch

40‧‧‧processing unit

41, 42‧‧‧ amplifier

50‧‧‧ display area

60‧‧‧Peripheral area

70‧‧‧ array

71, 80‧‧‧ Multiplexer

711‧‧‧ the first end

712‧‧‧second end

713‧‧‧ third end

714‧‧‧Selection

Vcom‧‧‧common potential

S‧‧‧Control signal

FIG. 1 is a schematic diagram of a touch sensing display panel according to a first embodiment of the present invention. FIG. 2 is a schematic circuit structure diagram of a switch connecting a conductive line and a data line according to an embodiment of the present invention. FIG. 3 is a schematic diagram of a touch-sensing display panel according to a second embodiment of the present invention. FIG. 4 is a schematic circuit diagram of a switch connecting a conductive line and a data line according to another embodiment of the present invention. FIG. 5 is a schematic diagram of a touch sensing display panel according to a third embodiment of the present invention. FIG. 6 is a schematic circuit diagram of a multiplexer connecting a conductive line and a data line according to an embodiment of the present invention.

100‧‧‧ touch sensing display panel

10‧‧‧ touch sensing layer

11‧‧‧ touch sensing unit

12‧‧‧ Conductive wire

20‧‧‧ Active Element Array Substrate

21‧‧‧data line

30‧‧‧ switch unit

40‧‧‧processing unit

50‧‧‧ display area

60‧‧‧Peripheral area

S‧‧‧Control signal

Claims (12)

A touch-sensing display panel includes: a touch-sensing layer including a plurality of touch-sensing units, each of which is electrically connected to a conductive wire; an active element array substrate, and the touch-sensing unit. The sensing layer is oppositely disposed. The active device array substrate includes a plurality of data lines; and a switch unit including a plurality of switches, one end of each switch is electrically connected to at least one of the conductive lines, and the other end is electrically connected to the At least one of the data lines; wherein the switches are in an on state during a touch sensing period. The touch-sensing display panel according to item 1 of the scope of patent application, further comprising: a processing unit electrically connected to the switch unit; wherein the active element array substrate has a display area and a peripheral area adjacent to the display area. , The processing unit and the switch unit are disposed on a first side of the peripheral area. The touch-sensing display panel according to item 1 of the scope of patent application, further comprising: a processing unit electrically connected to the switch unit; wherein the active element array substrate has a display area and a peripheral area adjacent to the display area. The processing unit and the switch unit are disposed in the peripheral area, and the processing unit and the switch unit are disposed on opposite sides of the display area as the center, respectively. The touch-sensing display panel according to item 3 of the scope of patent application, wherein the conductive line electrically connected to each touch-sensing unit is also electrically connected to another conductive line, and the conductive line is electrically connected to another conductive line. The line is electrically connected to an amplifier inside the processing unit. The touch-sensing display panel according to item 2 of the scope of patent application, wherein the conductive line electrically connected to each touch-sensing unit is also electrically connected to another conductive line, and the conductive line is electrically connected to another conductive line. The line is electrically connected to an amplifier inside the processing unit. The touch-sensing display panel according to item 1 of the scope of patent application, wherein each of the touch-sensing units corresponds to a plurality of pixels of the active device array substrate, and each of the touch-sensing units is electrically connected. The conductive line is substantially parallel to at least one of the data lines, and the conductive line electrically connected to each touch sensing unit is electrically connected to a common potential of at least one of the pixels. A touch-sensing display panel includes: a touch-sensing layer including a plurality of touch-sensing units, each of which is electrically connected to a conductive wire; an active element array substrate, and the touch-sensing unit. The sensing layer is oppositely disposed. The active device array substrate includes a plurality of data lines; and at least one multiplexer, each multiplexer has a first end, a second end, and a selection end, and each of the first ends is electrically connected. At least one of the conductive lines, each of the second ends is electrically connected to at least one of the data lines; wherein the first end and the second end of each multiplexer are used for a touch Turns on during sensing. The touch-sensing display panel according to item 7 of the scope of patent application, further comprising: a processing unit electrically connected to each multiplexer; wherein the active element array substrate has a display area and a display area adjacent to the display area. A peripheral area, the processing unit and each multiplexer are disposed on a first side of the peripheral area. The touch-sensing display panel according to item 8 of the scope of patent application, wherein the conductive line electrically connected to each touch-sensing unit is also electrically connected to another conductive line, and the conductive line is electrically connected to another conductive line. The line is electrically connected to an amplifier inside the processing unit. The touch-sensing display panel according to item 8 of the scope of patent application, wherein each multiplexer further has a third terminal, the third terminal is electrically connected to a common potential, and the processing unit is turned on during a display period. The first end and the third end of each multiplexer. The touch-sensing display panel according to item 8 of the scope of patent application, wherein the active device array substrate has a display area and a peripheral area adjacent to the display area, and each multiplexer is disposed in the peripheral area. The processing unit and each multiplexer are respectively disposed on opposite sides centered on the display area. The touch-sensing display panel according to item 7 of the scope of patent application, wherein each touch-sensing unit corresponds to a plurality of pixels of the active device array substrate, and each touch-sensing unit is electrically connected The conductive line is substantially parallel to at least one of the data lines, and the conductive line electrically connected to each touch sensing unit is electrically connected to a common potential of at least one of the pixels.