CN107436696B - Touch panel and display device having the same - Google Patents
Touch panel and display device having the same Download PDFInfo
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- CN107436696B CN107436696B CN201610358417.4A CN201610358417A CN107436696B CN 107436696 B CN107436696 B CN 107436696B CN 201610358417 A CN201610358417 A CN 201610358417A CN 107436696 B CN107436696 B CN 107436696B
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- common voltage
- line
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- compensation line
- capacitance
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04112—Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
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- General Physics & Mathematics (AREA)
- Liquid Crystal (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
A touch panel comprises a substrate and a display driving IC, wherein the substrate comprises a plurality of electrodes, a plurality of groups of connecting lines, at least one common voltage line and at least one common voltage switch. Each group of connecting lines comprises a routing line and a first capacitance compensation line. The first capacitance compensation line is formed on the plurality of electrodes, is positioned on the same straight line with the routing of the same group, and is connected with at least one common voltage line. In the driving mode, the display driving IC applies common voltage to the electrodes through the wires, and at least one common voltage wire applies common voltage to the first capacitance compensation wire, so that the capacitance of the first capacitance compensation wire compensates the capacitance of the wires, and in the touch driving mode, at least one common voltage switch is in floating connection.
Description
Technical Field
The present invention relates to a touch panel and a display device having the same.
Background
The related art display device employs an in-cell touch panel. As shown in fig. 1, the touch panel 200 of the display device includes a display driving IC203, a plurality of electrodes 205 and a plurality of traces 207, wherein the plurality of electrodes 205 are connected to the display driving IC203 through the plurality of traces 207. Since the lengths of the connecting lines 205 are different, the parasitic capacitances of the wires 207 are also different, so that the display device has problems of uneven brightness, color difference and the like in the display driving mode, and the display effect of the display device is poor.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a touch panel with a better display effect and a display device having the touch panel.
A touch panel is applied to a display device and comprises a substrate and a display driving IC arranged on the substrate, wherein the substrate comprises a plurality of electrodes and a plurality of groups of connecting wires, the substrate also comprises at least one common voltage wire and at least one common voltage switch, each group of connecting wires comprises a wire and a first capacitance compensation wire, one end of each group of wires is connected with one corresponding electrode, the other end of each group of wires is connected with the display driving IC, the first capacitance compensation wire is formed on the corresponding plurality of electrodes and is positioned on the same straight line with the same group of wires and is connected with the at least one common voltage wire, the at least one common voltage switch is connected with the at least one common voltage wire, the display driving IC can apply common voltage to the plurality of electrodes through the wires of the plurality of groups of connecting wires in a display driving mode of the display device, and meanwhile, the at least one common voltage line can apply common voltage to the first capacitance compensation line, so that the capacitance generated by the first capacitance compensation line can compensate the capacitance generated by the wires in the same group, and the at least one common voltage switch is in floating connection in a touch driving mode of the display device.
It is also necessary to provide a display device, which includes a touch panel and a touch driving IC, the touch panel includes a substrate and a display driving IC disposed on the substrate, the substrate includes a plurality of electrodes and a plurality of groups of wires, the substrate further includes at least one common voltage line and at least one common voltage switch, each group of wires includes a wire and a first capacitance compensation line, one end of the wire of each group is connected to a corresponding one of the electrodes, the other end of the wire is connected to the display driving IC, the first capacitance compensation line is formed on the corresponding plurality of electrodes, and is located on the same straight line as the wires of the same group and connected to the at least one common voltage line, the at least one common voltage switch is connected to the at least one common voltage line, the display driving IC can apply a common voltage to the plurality of electrodes through the plurality of groups of wires in a display driving mode of the display device, and meanwhile, the at least one common voltage line can apply common voltage to the first capacitance compensation line, so that the capacitance generated by the first capacitance compensation line can compensate the capacitance generated by the wires in the same group, and the at least one common voltage switch is in floating connection in a touch driving mode of the display device.
The touch panel comprises a plurality of electrodes, a plurality of groups of connecting lines, a common voltage line and a common voltage switch, wherein each connecting line comprises a wiring and at least one capacitance compensation line, the wiring is connected with the corresponding electrodes, and the at least one capacitance compensation line is formed on the corresponding electrode and is positioned on the same straight line with the wiring. The at least one capacitance compensation line is connected with the common voltage line through the common voltage switch, so that the common voltage is applied to the at least one capacitance compensation line by the common voltage line in the display driving mode, the capacitance of the at least one capacitance compensation line compensates the parasitic capacitance of the wiring, the size of the parasitic capacitance of each group of wiring is the same, the display device cannot have the problems of uneven brightness, color difference and the like in the display driving mode, and the display effect of the display device is better.
Drawings
Fig. 1 is a schematic structural diagram of a touch panel in the prior art.
Fig. 2 is a schematic structural diagram of a touch panel according to a first embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a touch panel according to a second embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a touch panel according to a third embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a touch panel according to a fourth embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a touch panel according to a fifth embodiment of the present invention.
Fig. 7 is a signal timing diagram of display driving and touch driving of the touch panel provided by the present invention.
Description of the main elements
| Touch |
100、200、300、400、500、600 |
| Display driver IC | 203、20、40、60、80、601 |
| Electrode for |
205、15、35、55、75、95 |
| |
207、171、371、571、771、971 |
| |
10、30、50、90 |
| |
11、31、51、71、91 |
| Non-display |
13、33、53、73、93 |
| Connecting wire | 17、37、57、77、97 |
| Capacitance |
173 |
| |
18、38、58、78、98 |
| |
19、39、59、79、99 |
| First |
373、573、773、973 |
| Second |
375、575、775、975 |
| Third |
377、577、777、977 |
| Fourth |
579、779、978 |
| Connecting |
72 |
| Fifth |
979 |
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
The following detailed description is made with reference to the accompanying drawings.
The touch panel 100 of the present invention is applied to a display device (not shown) including the touch panel 100 and a touch driving IC (not shown).
Referring to fig. 2, the touch panel 100 of the first embodiment of the invention includes a substrate 10 and a display driver IC20 disposed on the substrate 10.
The substrate 10 includes a display region 11 and a non-display region 13 disposed around the display region 11. The substrate 10 may be configured in a type in which a liquid crystal layer is formed between two substrates. In this case, a plurality of gate lines, a plurality of data lines crossing the plurality of gate lines, a plurality of pixels defined by crossings between the data lines and the gate lines, and a plurality of Thin Film Transistors (TFTs) respectively formed in the plurality of pixels are disposed at a lower substrate of the substrate 10. Here, a plurality of pixels are arranged in a matrix corresponding to the crossing structure of the data lines and the gate lines.
The substrate 10 further includes a plurality of electrodes 15, a plurality of sets of connection lines 17, one common voltage line 18, and a common voltage switch 19. A plurality of electrodes 15 are arranged in a matrix in the display region 11, respectively, and are disposed to overlap the plurality of pixel electrodes. Each electrode 15 operates as a common electrode for driving liquid crystal together with a pixel electrode formed in each pixel during a display driving period, and operates as a touch electrode for sensing a touch position according to a touch scan signal applied from a touch driving IC during a touch driving period. In the present embodiment, each electrode 15 has a side length of 4 to 6 mm.
The plurality of sets of connecting lines 17 are respectively disposed on the plurality of electrodes 15, and each set of connecting lines 17 includes a trace 171 and a capacitance compensation line 173. Each group of the traces 171 is located on the same straight line as a corresponding one of the capacitance compensation lines 173. One end of each group of routing lines 171 is connected to a corresponding one of the electrodes 15, and the other end is connected to the display driving IC20, so that the plurality of groups of routing lines 171 connect the plurality of electrodes 15 to the display driving IC20 in the first direction.
Each group of the capacitance compensation lines 173 is formed to extend in a second direction opposite to the first direction. A portion of each set of capacitance compensation lines 173 is formed at a corresponding one or more electrodes 15, but is not connected to the electrodes 15. Another portion of each group of the capacitance compensation lines 173, which is apart from the electrodes 15, is formed in the non-display region 13 and is connected to the common voltage line 18. Each group of the capacitance compensation lines 173 and the corresponding one of the routing lines 171 are located on a straight line, and the sum of the lengths of each group of the routing lines 171 and the corresponding one of the capacitance compensation lines 173 is the same, so that the lengths of each group of the connecting lines 17 are the same, and thus the parasitic capacitance of each group of the connecting lines 17 is the same in the display driving mode.
One common voltage line 18 is disposed on the top of the non-display area 13, and a common voltage switch 19 is connected to one end of the capacitance compensation line 173. One common voltage line 18 is disposed perpendicular to the capacitance compensation line 173.
The common voltage switch 19 is disposed in the non-display area 13 and connected to one common voltage line 18. When the common voltage switch 19 is connected to the common voltage line 18, the common voltage line 18 applies the common voltage to the capacitance compensation line 173 to generate a capacitance of the capacitance compensation line 173 that capacitively compensates for the parasitic capacitance of the trace 171, so that the parasitic capacitance of each of the wires 17 is the same in magnitude. When the common voltage switch 19 is floating, the common voltage line 18 does not apply the common voltage to the capacitance compensation line 173.
The display drive IC20 is located at the bottom of the non-display area 13 and is disposed opposite to the common voltage line 18. The display drive IC20 generates a common voltage and applies the common voltage to the touch drive ICs.
Referring to fig. 7, in one frame period, the driving mode of the touch panel 100 includes a display driving mode and a touch driving mode. When the driving mode of the touch panel 100 is the display driving mode, the touch driving IC applies the common voltage from the display driving IC20 to the plurality of electrodes 15 while the common voltage switch 19 is connected to the common voltage line 18, and the common voltage line 18 applies the common voltage to the capacitance compensation line 173 to make the touch panel 100 perform display. At this time, the capacitance of the capacitance compensation line 173 capacitively compensates the parasitic capacitance of the trace 171 so that the parasitic capacitances of the connecting lines 17 are the same. When the driving mode of the touch panel 100 is the touch driving mode, the touch driving IC applies a touch scan signal to the plurality of electrodes 15 while the common voltage switch 19 is floated, so that the touch panel 100 performs the touch driving. Since the common voltage switch 19 is floated in the touch driving mode, no additional load capacitance (RC loading) is added.
Referring to fig. 3, the structure of the touch panel 300 according to the second embodiment of the present invention is substantially the same as the structure of the touch panel 100 according to the first embodiment. The touch panel 300 of the second embodiment includes a substrate 30 and a display driver IC40 provided on the substrate 30.
The substrate 30 includes a display region 31 and a non-display region 33 surrounding the display region 31. The substrate 30 further includes a plurality of electrodes 35, a plurality of sets of connection lines 37, one common voltage line 38, and two common voltage switches 39.
The plurality of sets of connection lines 37 are respectively disposed on the plurality of electrodes 35, and each set of connection line 37 includes a trace 371, a first capacitive compensation line 373, a second capacitive compensation line 375, and a third capacitive compensation line 377.
One end of each group of traces 371 is connected to a corresponding one of the electrodes 35, and the other end is connected to the display driver IC40, so that the plurality of groups of traces 371 connect the plurality of electrodes 35 to the display driver IC40 in the first direction.
The first capacitive compensation line 373 is formed to extend in a second direction opposite to the first direction, and the second capacitive compensation line 375 and the third capacitive compensation line 377 are formed to extend in the first direction and the second direction, respectively.
A portion of the first capacitance compensation line 373 is formed at the corresponding one or more electrodes 35, but is not connected to the electrodes 35. Another portion of each group of the first capacitance compensation lines 373, which is apart from the electrode 35, is formed in the non-display region 33 and is connected to the common voltage line 38. Each group of the first capacitive compensation lines 373 and the same group of the traces 371 are located on a straight line, and the sum of the lengths of each group of the traces 371 and the corresponding first capacitive compensation lines 373 is the same.
The second capacitive compensation line 375 and the third capacitive compensation line 377 in the same group are respectively located at two sides of the first capacitive compensation line 373 and the trace 371 in the same group, and are arranged in parallel with the first capacitive compensation line 373 and the trace 371 at intervals. A portion of the second and third capacitive compensation lines 375 and 377 are formed at the plurality of electrodes 35 of one column, respectively, but are not connected to the electrodes 35, and another portion of the second and third capacitive compensation lines 375 and 377 remote from the electrodes 35 are formed at the non-display region 33 and connected to the common voltage line 38. The lengths of the second capacitive compensation line 375 and the third capacitive compensation line 377 are the same, so that the parasitic capacitance of each set of connection lines 37 is the same.
A common voltage line 38 is disposed on the top of the non-display region 33 and is connected to one ends of the first, second, and third capacitive compensation lines 373, 375, and 377. A common voltage line 38 is disposed perpendicular to the first, second, and third capacitive compensation lines 373, 375, and 377.
The two common voltage switches 39 are respectively disposed in the non-display area 33, are located on both sides of one common voltage line 38, and are connected to the one common voltage line 38. When the two common voltage switches 39 are connected to the common voltage line 38, the common voltage line 38 applies a common voltage to the first capacitive compensation line 373, the second capacitive compensation line 375, and the third capacitive compensation line 377, so that the capacitances of the first capacitive compensation line 373, the second capacitive compensation line 375, and the third capacitive compensation line 377 perform capacitive compensation on the parasitic capacitance of the trace 371, and thus the parasitic capacitances of each group of connection lines 37 are the same in size. When the two common voltage switches 39 are floating, the common voltage line 38 does not apply the common voltage to the first capacitive compensation line 373, the second capacitive compensation line 375, and the third capacitive compensation line 377.
The display drive IC40 is located in the non-display area 33 and below the display area 31, and is disposed opposite to the common voltage line 38. The display drive IC40 generates a common voltage and applies the common voltage to the touch drive ICs.
Referring to fig. 7, in one frame period, the driving mode of the touch panel 300 includes a display driving mode and a touch driving mode. When the driving mode of the touch panel 300 is the display driving mode, the touch driving IC applies the common voltage from the display driving IC40 to the plurality of electrodes 35, while the common voltage switch 39 is connected to the common voltage line 38, and the common voltage line 38 applies the common voltage to the first capacitance compensation line 373, the second capacitance compensation line 375, and the third capacitance compensation line 377 to display the touch panel 300. At this time, the parasitic capacitance of the trace 371 is compensated by the capacitances of the first capacitive compensation line 373, the second capacitive compensation line 375, and the third capacitive compensation line 377, so that the parasitic capacitances of the connection lines 37 of each group are the same. When the driving mode of the touch panel 300 is the touch driving mode, the touch driving IC applies a touch scan signal to the plurality of electrodes 35 while the common voltage switch 39 is floated, so that the touch panel 300 performs the touch driving. Since the common voltage switch 39 is floated in the touch driving mode, no additional load capacitance is added.
Referring to fig. 4, the structure of the touch panel 400 according to the third embodiment of the present invention is substantially the same as the structure of the touch panel 100 according to the first embodiment. The touch panel 400 of the third embodiment includes a substrate 50 and a display driver IC60 provided on the substrate 50.
The substrate 50 includes a display region 51 and a non-display region 53 surrounding the display region 51. The substrate 50 further includes a plurality of electrodes 55, a plurality of sets of wiring lines 57, a common voltage line 58, and a plurality of common voltage switches 59. A plurality of electrodes 55 are arranged in a matrix in the display area 51, respectively, and are disposed to overlap the plurality of pixel electrodes.
The plurality of groups of connecting lines 57 are respectively disposed on the plurality of electrodes 55, and the same group of connecting lines 57 are disposed on the plurality of electrodes 55 in the same column. Each set of connecting wires 57 includes a trace 571, a first capacitance compensation wire 573, a second capacitance compensation wire 575, a third capacitance compensation wire 577, and a fourth capacitance compensation wire 579.
One end of each set of traces 571 is connected to a corresponding one of the electrodes 55, and the other end is connected to the display driver IC60, so that the sets of traces 571 connect the plurality of electrodes 55 to the display driver IC60 in the first direction.
The first capacitive compensation line 573 extends in a second direction opposite to the first direction, and the second capacitive compensation line 575 and the third capacitive compensation line 577 extend in the first direction and the second direction, respectively. A portion of the first capacitance compensation line 573 is formed at the corresponding one or more electrodes 55, but is not connected to the electrode 55. Another portion of each of the first capacitance compensation lines 573 away from the electrode 55 is formed in the non-display region 53 and connected to the fourth capacitance compensation line 579. Each first capacitance compensation line 573 and the same group of the traces 571 are located on a straight line, and the sum of the lengths of each group of the traces 571 and the corresponding second capacitance compensation line 575 is the same.
The second capacitive compensation line 575 and the third capacitive compensation line 577 in the same group are respectively located at two sides of the first capacitive compensation line 573 and the trace 571 in the same group, and are spaced from and parallel to the first capacitive compensation line 573 and the trace 571. A portion of the second capacitive compensation line 575 and a portion of the third capacitive compensation line 577 of the same group are formed on the plurality of electrodes 55 in the same column, respectively, but are not connected to the electrodes 55, and another portion of the second capacitive compensation line 575 and the third capacitive compensation line 577, which is apart from the electrodes 55, are formed on the top of the non-display region 53 and are connected to the fourth capacitive compensation line 579. The length of the second capacitive compensation line 575 is the same as the length of the third capacitive compensation line 577. The fourth capacitance compensation line 579 is located on the top of the non-display area 53, and is connected to the first capacitance compensation line 573, the second capacitance compensation line 575, and one end of the third capacitance compensation line 577 away from the electrode 55, and is connected to the common voltage line 58 through a common voltage switch 59.
The common voltage line 58 is disposed on the top of the non-display region 53 and is spaced apart from and disposed in parallel with the plurality of sets of fourth capacitance compensation lines 579.
The common voltage switch 59 is disposed on the top of the non-display region 53, between the fourth capacitance compensation line 579 and the common voltage line 58, and connected to the fourth capacitance compensation line 579 and the common voltage line 58. A common voltage line 58 is disposed at the top of the non-display region 53, and a common voltage is applied to the first, second, third, and fourth capacitance compensation lines 573, 575, 577, and 579 through a common voltage switch 59. One common voltage line 58 is disposed perpendicular to the first, second, and third capacitance compensation lines 573, 575, and 577, and is disposed in parallel with a space from the fourth capacitance compensation line 579.
When the common voltage switch 59 is connected to the common voltage line 58, the common voltage line 58 applies a common voltage to the first capacitance compensation line 573, the second capacitance compensation line 575, the third capacitance compensation line 577 and the fourth capacitance compensation line 579, so that the capacitances of the first capacitance compensation line 573, the second capacitance compensation line 575, the third capacitance compensation line 577 and the fourth capacitance compensation line 579 perform capacitance compensation on the parasitic capacitance of the routing line 571, and thus the parasitic capacitances of each group of the connection lines 57 are the same in size. When the common voltage switch 59 is floating, the common voltage line 58 does not apply the common voltage to the first capacitance compensation line 573, the second capacitance compensation line 575, the third capacitance compensation line 577, and the fourth capacitance compensation line 579.
The display drive IC60 is located at the bottom of the non-display area 53 and below the display area 51, and is disposed opposite to the common voltage line 58. The display drive IC60 generates a common voltage and applies the common voltage to the touch drive ICs.
Referring to fig. 7, the driving mode of the touch panel 400 includes a display driving mode and a touch driving mode during one frame period. When the driving mode of the touch panel 400 is the display driving mode, the touch driving IC applies the common voltage from the display driving IC60 to the plurality of electrodes 55, and the common voltage switch 59 is connected to the common voltage line 58 to apply the common voltage to the first capacitance compensation line 573, the second capacitance compensation line 575, the third capacitance compensation line 577, and the fourth capacitance compensation line 579, so that the touch panel 400 performs display. At this time, the capacitances of the first capacitance compensation line 573, the second capacitance compensation line 575, the third capacitance compensation line 577 and the fourth capacitance compensation line 579 perform capacitance compensation on the parasitic capacitance of the trace 571, so that the parasitic capacitances of the connection lines 57 of each group are the same. When the driving mode of the touch panel 400 is the touch driving mode, the touch driving IC applies a touch scan signal to the plurality of electrodes 55 while the common voltage switch 59 is floated, so that the touch panel 400 performs the touch driving. Since the common voltage switch 59 is floated in the touch driving mode, no additional load capacitance is added.
Referring to fig. 5, the touch panel 500 according to the fourth embodiment of the present invention has a structure substantially the same as the touch panel 100 according to the first embodiment. The touch panel 500 of the fourth embodiment includes a substrate 70 and a display driver IC80 provided on the substrate 70.
The substrate 70 includes a display region 71 and a non-display region 73 disposed around the display region 71.
The substrate 70 further includes a connection line 72, a plurality of electrodes 75, a plurality of sets of connection lines 77, two common voltage lines 78, and two common voltage switches 79. A plurality of electrodes 75 are arranged in a matrix in the display area 71, respectively, and are disposed to overlap the plurality of pixel electrodes.
The plurality of groups of connecting wires 77 are respectively disposed on the plurality of electrodes 75, and the same group of connecting wires 77 is located on the plurality of electrodes 75 in the same column. Each set of wires 77 includes a trace 771, a first capacitive compensation wire 773, a second capacitive compensation wire 775, a third capacitive compensation wire 777, and a fourth capacitive compensation wire 779.
One end of each of the wirings 771 is connected to a corresponding one of the electrodes 75, and the other end is connected to the display driver IC80, so that the plurality of groups of wirings 771 connect the plurality of electrodes 75 to the display driver IC80 in the first direction.
The first capacitive compensation line 773 extends along a second direction opposite to the first direction, and the second capacitive compensation line 775 and the third capacitive compensation line 777 extend along the first direction and the second direction, respectively. A portion of one first capacitance compensation line 773 is formed at the corresponding one or more electrodes 75, but is not connected to the electrode 75. Another portion of each of the first capacitance compensation lines 773, which is apart from the electrode 75, is formed in the non-display area 73 and is connected to a fourth capacitance compensation line 779. Each group of the first capacitive compensation lines 773 and a corresponding one of the traces 771 are located on a straight line, and the sum of the lengths of each group of the traces 771 and the corresponding first capacitive compensation lines 773 is the same.
The second capacitive compensation line 775 and the third capacitive compensation line 777 are respectively located on two sides of the first capacitive compensation line 773 and the corresponding one of the traces 771, and are arranged in parallel with the first capacitive compensation line 773 and the corresponding one of the traces 771 at intervals. The second capacitance compensation line 775 and a part of the third capacitance compensation line 777 of the same group of connection lines 77 are formed on the plurality of electrodes 75 in the same column, respectively, but are not connected to the electrodes 75. Both ends of the second capacitance compensation line 775 and the third capacitance compensation line 777 are formed at the top and bottom of the non-display region 73, respectively, and the ends of the second capacitance compensation line 775 and the third capacitance compensation line 777 located at the top of the non-display region 73 are connected to the fourth capacitance compensation line 779 to form a set of connection lines 77. The second 775 and third 777 capacitance compensation lines are connected to the connection line 72 at the end away from the fourth 779 capacitance compensation line. The second capacitive compensation line 775 and the third capacitive compensation line 777 have the same length, so that the parasitic capacitance of each group of connection lines 77 is the same.
The connecting lines 72 are disposed at the bottom of the non-display region 73 and are parallel to the fourth capacitance compensation lines 779 of the plurality of groups of connecting lines 77. The connection line 72 is insulated from the trace 771 of each group, and is connected to the ends of the second 775 and third 777 capacitive compensation lines of each group, which are far from the fourth 779 capacitive compensation line.
The common voltage lines 78 are disposed at the bottom of the non-display region 73, are disposed in parallel with the connection lines 72, and are respectively connected to a corresponding one of the common voltage switches 79.
Two common voltage switches 79 are disposed at the bottom of the non-display region 73 between the connection line 72 and the common voltage line 78. Two common voltage switches 79 are connected to both ends of the connection line 72 and the common voltage line 78, respectively.
When the common voltage switch 79 is connected to the common voltage line 78, the common voltage line 78 applies a common voltage to the first capacitive compensation line 773, the second capacitive compensation line 775, the third capacitive compensation line 777 and the fourth capacitive compensation line 779 through the connection line 72, so that the capacitances of the first capacitive compensation line 773, the second capacitive compensation line 775, the third capacitive compensation line 777 and the fourth capacitive compensation line 779 perform capacitive compensation on the parasitic capacitance of the trace 771, and the parasitic capacitances of each group of the connection lines 77 are the same in size. When the common voltage switch 79 is floated, the common voltage line 78 does not apply the common voltage to the first, second, third, and fourth capacitive compensation lines 773, 775, 777, and 779.
The display driving IC80 is located at the bottom of the non-display region 73, and the display driving IC80 generates a common voltage and applies the common voltage to the touch driving IC.
Referring to fig. 7, in one frame period, the driving mode of the touch panel 500 includes a display driving mode and a touch driving mode. When the driving mode of the touch panel 500 is the display driving mode, the touch driving IC applies the common voltage from the display driving IC80 to the plurality of electrodes 75, and the common voltage switch 79 is connected to the common voltage line 78 to apply the common voltage to the first capacitance compensation line 773, the second capacitance compensation line 775, the third capacitance compensation line 777, and the fourth capacitance compensation line 779, so that the touch panel 500 performs display. At this time, the capacitances of the first capacitive compensation line 773, the second capacitive compensation line 775, the third capacitive compensation line 777, and the fourth capacitive compensation line 779 compensate the parasitic capacitance of the trace 771, so that the parasitic capacitances of the connection lines 77 of each group are the same. When the driving mode of the touch panel 500 is the touch driving mode, the touch driving IC applies a touch scan signal to the plurality of electrodes 75 while the common voltage switch 79 is floated, so that the touch panel 500 performs the touch driving. Since the common voltage switch 79 is floated in the touch driving mode, no additional load capacitance is added.
Referring to fig. 6, a touch panel 600 according to a fifth embodiment of the present invention has substantially the same structure as the touch panel 100 according to the first embodiment. The touch panel 600 of the fifth embodiment includes a substrate 90 and a display driver IC601 provided on the substrate 90.
The substrate 90 includes a display region 91 and a non-display region 93 surrounding the display region 91.
The substrate 90 further includes a plurality of electrodes 95, a plurality of sets of wiring 97, a common voltage line 98, and two common voltage switches 99. A plurality of electrodes 95 are arranged in a matrix in the display region 91, respectively, and are disposed to overlap the plurality of pixel electrodes.
The plurality of groups of connecting wires 97 are respectively disposed on the plurality of electrodes 95, and the same group of connecting wires 97 are disposed on the same row of the plurality of electrodes 95. Each set of connection lines 97 includes a trace 971, a first capacitance compensation line 973, a second capacitance compensation line 975, a third capacitance compensation line 977, a fourth capacitance compensation line 978, and a fifth capacitance compensation line 979.
One end of each set of routing 971 is connected to a corresponding one of the electrodes 95, and the other end is connected to the display driver IC601, so that the multiple sets of routing 971 connect the multiple electrodes 95 to the display driver IC601 in the first direction.
The first capacitive compensation line 973 extends in a second direction opposite to the first direction, and the second and third capacitive compensation lines 975 and 977 extend in the first and second directions, respectively.
A portion of the first capacitance compensation line 973 is formed at the corresponding one or more electrodes 95, but is not connected to the electrodes 95. Two ends of each first capacitance compensation line 973 away from the electrode 95 are respectively formed in the non-display region 93 and connected to the fourth capacitance compensation line 978. Each first capacitance compensation line 973 and a corresponding one of the routing lines 971 are located on a straight line, and the sum of the lengths of each set of routing lines 971 and the corresponding second capacitance compensation line 975 is the same.
The second capacitance compensation line 975 and the third capacitance compensation line 977 are respectively located at two sides of the first capacitance compensation line 973 and a corresponding one of the routing lines 971, and are spaced from the first capacitance compensation line 973 and the corresponding one of the routing lines 971 in parallel. A portion of the second capacitance compensation line 975 and a portion of the third capacitance compensation line 977 of the same group of connection lines 97 are formed on the plurality of electrodes 95 in the same column, respectively, but are not connected to the electrodes 95. Both ends of the second and third capacitance compensation lines 975 and 977 distant from the electrode 95 are formed at the top and bottom of the non-display region 93, respectively. Ends of the second and third capacitance compensation lines 975 and 977 positioned at the top of the non-display area 93 are connected to the fourth capacitance compensation line 978, and ends of the second and third capacitance compensation lines 975 and 977 positioned at the bottom of the non-display area 93 are connected to the fifth capacitance compensation line 979. The second and third capacitance compensation lines 975 and 977 have the same length.
The fourth capacitance compensation line 978 is located at the top of the non-display region 93, and the fifth capacitance compensation line 979 is located at the bottom of the non-display region 93 and is parallel to the fourth capacitance compensation line 978. The fifth capacitance compensation line 979 is insulated from the trace 971 and connected to ends of the second and third capacitance compensation lines 975 and 977.
The common voltage line 98 is disposed at the bottom of the non-display region 93 and at the top of the display driving IC601, and is connected to a plurality of common voltage switches 99.
The plurality of common voltage switches 99 are respectively disposed at the bottom of the non-display region 93 between the common voltage line 98 and the fifth capacitance compensation line 979 of the plurality of sets of connection lines 97, and are connected to the common voltage line 98 and the fifth capacitance compensation line 979 of the plurality of sets of connection lines 97. Each common voltage switch 99 is connected to the fifth capacitance compensation line 979 of each corresponding group of connection lines 97.
When the common voltage switch 99 is connected to the common voltage line 98, the common voltage line 98 applies a common voltage to the first capacitance compensation line 973, the second capacitance compensation line 975, the third capacitance compensation line 977, the fourth capacitance compensation line 978 and the fifth capacitance compensation line 979, so that the capacitances of the first capacitance compensation line 973, the second capacitance compensation line 975, the third capacitance compensation line 977, the fourth capacitance compensation line 978 and the fifth capacitance compensation line 979 perform capacitance compensation on the parasitic capacitance of the trace 771, and thus the parasitic capacitances of each group of the connection lines 97 are the same in size. When the common voltage switch 99 is floating, the common voltage line 98 does not apply a common voltage to the first, second, third, fourth, and fifth capacitance compensation lines 973, 975, 977, 978, and 979. The display driver IC601 is located at the bottom of the non-display region 93 and below the display region 91. The display driving IC601 generates a common voltage and applies the common voltage to the touch driving IC.
Referring to fig. 7, in one frame period, the driving mode of the touch panel 600 includes a display driving mode and a touch driving mode. When the driving mode of the touch panel 600 is the display driving mode, the touch driving IC applies the common voltage from the display driving IC601 to the plurality of electrodes 95, and the common voltage switch 99 is connected to the common voltage line 98 to apply the common voltage to the first capacitance compensation line 973, the second capacitance compensation line 975, the third capacitance compensation line 977, the fourth capacitance compensation line 978, and the fifth capacitance compensation line 979, so that the touch panel 600 performs display. At this time, the capacitances of the first capacitance compensation line 973, the second capacitance compensation line 975, the third capacitance compensation line 977, the fourth capacitance compensation line 978 and the fifth capacitance compensation line 979 compensate the parasitic capacitance of the trace 971, so that the parasitic capacitances of the connection lines 97 of each group are the same. When the driving mode of the touch panel 600 is the touch driving mode, the touch driving IC applies a touch scan signal to the plurality of electrodes 95 while the common voltage switch 99 is floated, so that the touch panel 600 performs the touch driving. Since the common voltage switch 99 is floated in the touch driving mode, no additional load capacitance is added.
The touch panel 100 of the present invention includes a plurality of electrodes 15, a plurality of groups of connecting lines 17 and a common voltage line 18, each connecting line 17 includes a trace 171 and at least one capacitance compensation line 173, the trace 171 is connected to the corresponding electrode 15, and at least one capacitance compensation line 173 is formed on the corresponding electrode 15 and is located on the same straight line as the trace 171. The at least one capacitance compensation line 173 is connected to the common voltage line 18 through the common voltage switch 19, so that the common voltage line 18 applies a common voltage to the at least one capacitance compensation line 173 during the display driving mode, so that the capacitance of the at least one capacitance compensation line 173 compensates the parasitic capacitance of the trace 171, and the parasitic capacitance of each group of the connecting lines 17 is the same, thereby the display device does not have the problems of uneven brightness, color difference and the like during the display driving mode, and the display effect of the display device is better.
Of course, the present invention is not limited to the above-disclosed embodiments, and various modifications may be made to the above-described embodiments. It will be appreciated by those skilled in the art that changes and modifications to the above embodiment may be made without departing from the true spirit of the invention, and the scope of the invention is to be defined by the appended claims.
Claims (10)
1. A touch panel is applied to a display device, and comprises a substrate and a display drive IC arranged on the substrate, wherein the substrate comprises a plurality of electrodes and a plurality of groups of connecting wires, the touch panel is characterized in that the substrate also comprises at least one common voltage wire and at least one common voltage switch, each group of connecting wires comprises a wire and a first capacitance compensation wire, one end of each group of the wires is connected with a corresponding electrode, the other end of each group of the wires is connected with the display drive IC, the first capacitance compensation wire is formed on the corresponding plurality of electrodes, is positioned on the same straight line with the wires of the same group and is connected with the at least one common voltage wire, the at least one common voltage switch is connected with the at least one common voltage wire, and the display drive IC can apply common voltage to the plurality of electrodes through the wires of the plurality of groups of connecting wires in a display drive mode of the display device, and meanwhile, the at least one common voltage line can apply common voltage to the first capacitance compensation line, so that the capacitance generated by the first capacitance compensation line can compensate the capacitance generated by the wires in the same group, and the at least one common voltage switch is in floating connection in a touch driving mode of the display device.
2. The touch panel of claim 1, wherein the at least one common voltage line and the at least one common voltage switch are respectively disposed on a top of the substrate, the at least one common voltage switch is connected to one end of the at least one common voltage line, and the at least one common voltage line is disposed perpendicular to and connected to the first capacitance compensation line.
3. The touch panel of claim 1, wherein each of the plurality of connection lines further includes a second capacitance compensation line and a third capacitance compensation line, the second capacitance compensation line and the third capacitance compensation line of the same connection line are respectively formed on the corresponding plurality of electrodes and located at two sides of the routing line of the same connection line, and ends of the second capacitance compensation line and the third capacitance compensation line of the same connection line, which are far away from the plurality of electrodes, are connected to the at least one common voltage line.
4. The touch panel of claim 3, wherein the at least one common voltage line and the at least one common voltage switch are disposed on a top of the substrate, the at least one common voltage line is connected to ends of the first capacitance compensation line, the second capacitance compensation line, and the third capacitance compensation line remote from the plurality of electrodes, and the at least one common voltage switch comprises two common voltage switches respectively disposed at two ends of the at least one common voltage line and connected to one end of the at least one common voltage line.
5. The touch panel of claim 3, wherein each of the plurality of groups of connecting lines further includes a fourth capacitance compensation line disposed on the top of the substrate and connected to an end of the first, second, and third capacitance compensation lines of the same group remote from the plurality of electrodes, the at least one common voltage line and the at least one common voltage switch are disposed on the top of the substrate, the at least one common voltage line is disposed in parallel with the fourth capacitance compensation line, and the at least one common voltage switch is disposed between and connected to the fourth capacitance compensation line and the at least one common voltage line such that the plurality of groups of connecting lines are connected to the at least one common voltage line through the at least one common voltage switch.
6. The touch panel of claim 3, wherein each of the plurality of connection lines further includes a fourth capacitance compensation line disposed on the top of the substrate and connected to ends of the first, second, and third capacitance compensation lines of the same group remote from the plurality of electrodes, the substrate further includes a connection line disposed on the bottom of the substrate and arranged in parallel with the fourth capacitance compensation line of the plurality of connection lines, the connection line being insulated from the traces of the plurality of connection lines and connected to ends of the second and third capacitance compensation lines of the plurality of connection lines remote from the fourth capacitance compensation line, the at least one common voltage switch and the at least one common voltage line being disposed on the bottom of the substrate, respectively, the at least one common voltage switch being disposed between the connection line and the at least one common voltage line, and is connected to the connection line and the at least one common voltage line such that the plurality of groups of connection lines are connected to the at least one common voltage line through the connection line and the at least one common voltage switch.
7. The touch panel of claim 3, wherein each of the plurality of connection lines further includes a fourth capacitance compensation line and a fifth capacitance compensation line, the fourth capacitance compensation line is located at the top of the substrate and connected to ends of the first, second, and third capacitance compensation lines of the same group remote from the plurality of electrodes, the fifth capacitance compensation line is located at the bottom of the substrate and arranged in parallel with the fourth capacitance compensation line, the fifth capacitance compensation line of each of the plurality of connection lines is insulated from the traces of the same group and connected to ends of the second and third capacitance compensation lines of the same group remote from the fourth capacitance compensation line, the at least one common voltage line and the at least one common voltage switch are both arranged at the bottom of the substrate, the at least one common voltage line is arranged in parallel with the fifth capacitance compensation line of the plurality of connection lines, and is insulated from the routing of the plurality of groups of connection lines, the at least one common voltage switch is located between the at least one common voltage line and the fifth capacitance compensation line and is connected with the at least one common voltage line and the fifth capacitance compensation line, so that the plurality of groups of connection lines are connected with the at least one common voltage line through the at least one common voltage switch.
8. The touch panel of claim 3, wherein the length of the second capacitive compensation line is the same as the length of the third capacitive compensation line.
9. A display device comprises a touch panel and a touch driving IC, the touch panel comprises a substrate and the display driving IC arranged on the substrate, the substrate comprises a plurality of electrodes and a plurality of groups of connecting wires, the display device is characterized in that the substrate also comprises at least one common voltage wire and at least one common voltage switch, each group of connecting wires comprises a wire and a first capacitance compensation wire, one end of each group of the wire is connected with one corresponding electrode, the other end of each group of the wire is connected with the display driving IC, the first capacitance compensation wire is formed on the corresponding plurality of electrodes, is positioned on the same straight line with the same group of wires and is connected with the at least one common voltage wire, the at least one common voltage switch is connected with the at least one common voltage wire, the display driving IC can apply common voltage to the plurality of electrodes through the plurality of groups of connecting wires in the display driving mode of the display device, and meanwhile, the at least one common voltage line can apply common voltage to the first capacitance compensation line, so that the capacitance generated by the first capacitance compensation line can compensate the capacitance generated by the wires in the same group, and the at least one common voltage switch is in floating connection in a touch driving mode of the display device.
10. The display device according to claim 9, wherein the display driver IC is disposed at a bottom of the substrate, the display driver IC is capable of generating a common voltage and applying the common voltage to the touch driver IC, and the touch driver IC is capable of applying the common voltage from the display driver IC to the plurality of electrodes through the plurality of sets of wires in a display driving mode of the touch panel.
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| CN108761874B (en) * | 2018-05-04 | 2023-05-12 | 昆山国显光电有限公司 | Display panel and display device |
| CN109683751B (en) | 2019-01-04 | 2020-05-26 | 合肥鑫晟光电科技有限公司 | Touch substrate and its manufacturing method, and display device |
| CN113031820B (en) * | 2021-03-25 | 2024-02-27 | 联想(北京)有限公司 | Touch screen, electronic equipment and information processing method |
| CN114387882B (en) * | 2021-12-31 | 2024-05-03 | 上海中航光电子有限公司 | Display panel and display device |
| CN114677987B (en) * | 2022-04-26 | 2023-07-07 | 北京京东方光电科技有限公司 | Display panel and display device |
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