CN114168017A - Display panel and display device - Google Patents

Display panel and display device Download PDF

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Publication number
CN114168017A
CN114168017A CN202111529722.2A CN202111529722A CN114168017A CN 114168017 A CN114168017 A CN 114168017A CN 202111529722 A CN202111529722 A CN 202111529722A CN 114168017 A CN114168017 A CN 114168017A
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touch
sub
touch electrode
resistance
electrode
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CN202111529722.2A
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CN114168017B (en
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郑耀飞
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Wuhan Tianma Microelectronics Co Ltd
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Wuhan Tianma Microelectronics Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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
    • G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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
    • G06F2203/04111—Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Input By Displaying (AREA)

Abstract

The embodiment of the invention provides a display panel and a display device. The display panel comprises a first touch electrode and a second touch electrode which have different extending directions; two adjacent first electrode blocks in the first touch electrode are electrically connected through a first connecting part; two adjacent second electrode blocks in the second touch electrode are electrically connected through a second connecting part; the first connecting part and the second connecting part are crossed in an insulating way; the binding area comprises a plurality of binding terminals, the first routing is connected between the first touch electrode and the binding terminals, and the second routing is connected between the second touch electrode and the binding terminals; the first wire comprises a first sub-wire and a second sub-wire, the resistance of the first sub-wire is smaller than that of the second sub-wire, and the first touch electrode connected with the first sub-wire is positioned on one side, far away from the binding area, of the first touch electrode connected with the second sub-wire. The invention can improve the touch detection precision.

Description

Display panel and display device
Technical Field
The invention relates to the technical field of display, in particular to a display panel and a display device.
Background
At present, a capacitive touch screen is widely applied to electronic products such as mobile phones and tablet computers as an important part of human-computer interaction. The capacitive touch screen has the advantages of long service life, high light transmittance, capability of supporting multi-point touch control and the like, so that the capacitive touch screen becomes the mainstream touch screen technology at present. However, the current touch products have the problem of low touch detection precision, which affects touch performance.
Disclosure of Invention
The embodiment of the invention provides a display panel and a display device, and aims to solve the problem of low touch detection precision in the prior art.
In a first aspect, an embodiment of the present invention provides a display panel, including: the touch control device comprises a plurality of first touch control electrodes extending in a first direction and arranged in a second direction, a plurality of second touch control electrodes extending in the second direction and arranged in the first direction, and a plurality of touch control electrodes arranged in the first direction, wherein the first direction and the second direction are crossed;
the first touch electrode comprises a plurality of first electrode blocks, and two adjacent first electrode blocks are electrically connected through a first connecting part; the second touch electrode comprises a plurality of second electrode blocks, and two adjacent second electrode blocks are electrically connected through a second connecting part; the first connecting part and the second connecting part are crossed in an insulating way;
the display panel further comprises a binding area, a first wire and a second wire; the binding region comprises a plurality of binding terminals and is positioned on one side of the first touch electrode in the second direction; one end of the first wire is connected with a first touch electrode, the other end of the first wire is connected with a binding terminal, one end of the second wire is connected with a second touch electrode, and the other end of the second wire is connected with a binding terminal;
the first routing comprises a first sub-routing and a second sub-routing, the resistance of the first sub-routing is smaller than that of the second sub-routing, and the first touch electrode connected with the first sub-routing is located on one side, far away from the binding area, of the first touch electrode connected with the second sub-routing.
In a second aspect, an embodiment of the present invention further provides a display device, including the display panel provided in any embodiment of the present invention.
The display panel and the display device provided by the embodiment of the invention have the following beneficial effects: the distance between the first touch electrode connected with the first sub-wires and the binding area is larger than the distance between the first touch electrode connected with the second sub-wires and the binding area. The resistance of the first sub-wires is set to be smaller than that of the second sub-wires, so that the difference between the resistance load of the second electrode block in the touch detection loop where the first sub-wires are located and the resistance load of the second electrode block in the touch detection loop where the second sub-wires are located is compensated, the load difference in the two touch detection loops is reduced, the loss difference in the two touch detection loops when touch detection signals are transmitted is reduced, and the touch detection precision is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without inventive labor.
FIG. 1 is a schematic diagram of a display panel in the prior art;
fig. 2 is a schematic view of a display panel according to an embodiment of the invention;
fig. 3 is a schematic diagram of a touch detection circuit of a display panel according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of another display panel according to an embodiment of the present invention;
fig. 5 is a schematic view of another touch detection circuit of the display panel according to the embodiment of the invention;
FIG. 6 is a partial schematic view of another display panel according to an embodiment of the invention;
FIG. 7 is an enlarged partial view of the area Q2 of FIG. 2;
FIG. 8 is a schematic cross-sectional view taken along line A-A' of FIG. 2;
FIG. 9 is a schematic view of another display panel according to an embodiment of the present invention;
fig. 10 is a schematic view of a display device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
Fig. 1 is a schematic diagram of a display panel in the prior art, and as shown in fig. 1, the display panel includes a first touch electrode 010 and a second touch electrode 020, which have different extending directions, where the first touch electrode 010 includes a plurality of first electrode blocks 011, and the second touch electrode 020 includes a plurality of second electrode blocks 021. The first touch electrode 010 is connected to the touch driving chip 05 through a first touch lead 03, and the second touch electrode 020 is connected to the touch driving chip 05 through a second touch lead 04. When the mutual capacitance method is used for touch detection, a plurality of capacitors are formed between the plurality of first electrode blocks 011 and the plurality of second electrode blocks 021, a touch driving signal is provided to the second touch electrode 020 through the second touch lead 04, and the first touch lead 03 returns a touch sensing signal sensed by the first touch electrode 010 to the touch driving chip 05. An initial capacitance value exists on each capacitor formed in the display panel, when a finger touches a certain position on the display panel, the capacitance value of the capacitor at the position changes, and the touch driving chip 05 can judge the position of the capacitor where the capacitance value changes according to a touch sensing signal returned by the first touch lead 03, so that the touch position of the finger is determined, and the touch position detection is realized.
As can be seen from fig. 1, the distances from the touch driving chip 05 to the plurality of first touch electrodes 010 arranged in the display panel are different, which results in different lengths of the first touch leads 03, and the lengths of the first touch leads 03 connected to the first touch electrodes 010 are gradually decreased along a direction approaching the touch driving chip 05. When the process parameters (manufacturing material, line width, and line thickness) of each first touch lead 03 are the same, the resistance of the first touch lead 03 connected to the first touch electrode 010 decreases gradually along the direction close to the touch driving chip 05. The smaller the resistance of the first touch lead 03 is, the smaller the load on the first touch lead 03 is, so that the loss of each first touch lead 03 in returning the touch sensing signal is different. The difference in loss affects the touch sensing signal received by the touch driving chip 05, so that the touch driving chip 05 cannot determine whether the change in the touch sensing signal is caused by the loss of the resistive load on the touch lead or the capacitance change of the capacitor, and thus cannot accurately determine the touch location, which affects the touch precision.
In a prior art, the resistances of the first touch leads 03 are set to be the same, so that the losses of the first touch leads 03 in returning the touch sensing signals are ensured to be the same, thereby solving the above-mentioned problems and improving the touch accuracy. In fact, when performing touch detection, the first touch lead 03, the first electrode block 011, the second electrode block 021, the second touch lead 04, and the detection module inside the touch driving chip 05 form a touch detection loop. Not only the load on the touch lead will cause the loss of the touch sensing signal, but also the resistance of the first electrode block 011 and the resistance of the second electrode block 021 in the whole touch detection loop will have an influence on the touch sensing signal. Taking touch points a and B in fig. 1 as an example, point a and point B are different positions in the display panel. When touch detection is performed, the number of the first electrode blocks 011 in the touch detection loop where the touch point a is located is different from the number of the first electrode blocks 011 in the touch detection loop where the touch point a is located, and the number of the second electrode blocks 021 in the two touch detection loops is also different, so that the overall loads in the two touch detection loops are different, and the overall loads include loads generated by the electrode blocks and loads generated by the touch lead wires. The overall load in the two touch detection loops is different, which causes a difference in loss of the first touch lead 03 when the first touch lead returns the touch sensing signal, and the difference in loss also affects the touch accuracy.
In order to solve the above problems, embodiments of the present invention provide a display panel, in which a resistance of a trace connected to a touch electrode is designed to improve a load difference between touch detection loops at different touch points in the display panel, so as to improve touch detection accuracy.
Fig. 2 is a schematic view of a display panel according to an embodiment of the invention, as shown in fig. 2, the display panel includes a plurality of first touch electrodes 10 extending in a first direction x and arranged in a second direction y, and a plurality of second touch electrodes 20 extending in the second direction y and arranged in the first direction x, where the first direction x and the second direction y intersect.
The first touch electrode 10 includes a plurality of first electrode blocks 11, and two adjacent first electrode blocks 11 are electrically connected by a first connection portion 12; the second touch electrode 20 includes a plurality of second electrode blocks 21, and two adjacent second electrode blocks 21 are electrically connected by a second connection portion 22; the first connection portion 12 and the second connection portion 22 are insulated and crossed. In one embodiment, the first electrode block 11 and the second electrode block 21 are located in the same layer, and one of the first connection portion 12 and the second connection portion 22 is located in the same layer as the two electrode blocks and the other is located in a different layer from them. When performing touch detection, one of the first touch electrode 10 and the second touch electrode 20 serves as a touch driving electrode, and the other serves as a touch sensing electrode.
The display panel further includes a bonding area 30, a first trace 40, and a second trace 50; the bonding region 30 includes a plurality of bonding terminals 31, and the bonding region 30 is located at one side of the first touch electrode 10 in the second direction y; one end of the first wire 40 is connected to one first touch electrode 10, the other end is connected to one binding terminal 31, one end of the second wire 50 is connected to one second touch electrode 20, and the other end is connected to one binding terminal 31. The wiring is used for realizing the connection of an electric signal between the touch electrode and the binding terminal 31, and the binding terminal 31 is used for binding the flexible circuit board so as to realize the connection between the touch electrode and the touch driving chip.
The first trace 40 includes a first sub-trace 41 and a second sub-trace 42, the first touch electrode 10 connected to the first sub-trace 41 is located on a side of the first touch electrode 10 connected to the second sub-trace 42, which is far away from the bonding area 30, and the resistance of the first sub-trace 41 is smaller than the resistance of the second sub-trace 42.
Touch location C and touch location D as illustrated in fig. 2. When the touch position is at the touch location point C, the touch detection loop includes a first sub-trace 41; when the touch position is at the touch location D, the touch detection circuit includes the second sub-trace 42. In the second direction y, the touch location point C is farther from the binding area 30 than the touch location point D, and it can be understood that the number of the second electrode blocks 21 in the touch detection loop where the touch location point C is located is greater than the number of the second electrode blocks 21 in the touch detection loop where the touch location point D is located. When the resistances of the second electrode blocks 21 are substantially the same, the resistive loads of the second electrode blocks 21 in the touch detection loop where the touch point C is located are greater than the resistive loads of the second electrode blocks 21 in the touch detection loop where the touch point D is located. In the embodiment of the present invention, it is configured that the resistance of the first sub-trace 41 is smaller than the resistance of the second sub-trace 42, and the load of the first sub-trace 41 in the touch detection loop where the touch point C is located is smaller than the load of the second sub-trace 42 in the touch detection loop where the touch point D is located. The resistance of the first sub-trace 41 is set to be smaller than the resistance of the second sub-trace 42, so as to compensate for the load difference between the touch detection loop where the first sub-trace 41 is located and the detection loop where the second sub-trace 42 is located.
The distance from the first touch electrode 10 connected with the first sub-trace 41 to the bonding area 30 is greater than the distance from the first touch electrode 10 connected with the second sub-trace 42 to the bonding area 30. The length of the first sub-trace 41 is greater than the length of the second sub-trace 42 in the conventional design, and the resistance of the first sub-trace 41 is greater than the resistance of the second sub-trace 42 when the design is not changed. In further prior art, the resistances of the traces connected between the touch electrode and the touch driving chip are set to be equal, that is, the resistance of the first sub-trace 41 is set to be equal to the resistance of the second sub-trace 42, so that the loss when the touch signals are transmitted on the traces is the same. In the embodiment of the present invention, the resistance of the first sub-trace 41 is set to be smaller than the resistance of the second sub-trace 42, so as to compensate the difference between the resistive load of the second electrode block 21 in the touch detection loop where the first sub-trace 41 is located and the resistive load of the second electrode block 21 in the detection loop where the second sub-trace 42 is located, so as to reduce the load difference between the two touch detection loops, thereby reducing the loss difference between the two touch detection loops when transmitting the touch detection signal, and improving the touch detection accuracy.
In some embodiments, the display panel includes b first touch electrodes 10, where b is a positive integer. Wherein, the distances from the 1 st first touch electrode 10, the 2 nd first touch electrode 10 to the b-th first touch electrode 10 to the binding region 30 gradually decrease; the resistance of the first trace 40 connected to the 1 st first touch electrode 10, the resistance of the first trace 40 connected to the 2 nd first touch electrode 10, and the resistance of the first trace 40 connected to the b-th first touch electrode 10 become larger gradually. In the present invention, as the distance from the first touch electrode 10 to the bonding area 30 is gradually decreased along the second direction y, the resistance of the first trace 40 connected to the first touch electrode 10 is gradually increased, so as to compensate the resistance load difference of the second electrode block 21 in the touch detection loop by using the resistance load of the first trace 40, reduce the overall load difference in each touch detection loop, and improve the touch detection accuracy.
In some embodiments, the areas where the first touch electrodes 10 and the second touch electrodes 20 are located are touch areas of the display panel, and the first traces 40 are disposed on the same side of the touch areas in the first direction x. As shown in fig. 2, the first touch electrode 10 extends along the first direction x, and the first touch electrode 10 includes a first side and a second side in the first direction x. Taking the right side of the schematic diagram of fig. 2 as the first side of the first touch electrode 10 and the left side as the second side of the first touch electrode 10 as an example, it can be seen that the plurality of first touch electrodes 10 are all connected to their respective first traces 40 on the first side. By the arrangement, the load change in each touch detection loop at different touch positions in the display panel shows a certain rule. For example, in the first direction x, as the distance between the touch position and the first side of the first touch electrode 10 is shorter, the number of the first electrode blocks 11 included in the touch detection loop is smaller, and the total resistive load of the first electrode blocks 11 in the touch detection loop is smaller; as the distance between the touch location point and the bonding area 30 in the second direction y is shorter, the number of the second electrode blocks 21 included in the touch detection loop is smaller, and the total resistive load of the second electrode blocks 21 in the touch detection loop is smaller. Therefore, the resistance of the first trace 40 and/or the resistance of the second trace 50 can be conveniently designed to reduce the load difference in each touch detection loop, so that the loss difference in each touch detection loop when transmitting the touch detection signal is basically the same, and the touch detection precision is improved.
In some embodiments, the display panel includes a second touch electrodes 20 arranged in the first direction x, where a is a positive integer. As shown in fig. 2, in a direction pointing from the second side of the first touch electrode 10 to the first side in the first direction x, the display panel includes a 1 st second touch electrode 20, a 2 nd second touch electrode 20, and an a-th second touch electrode 20, which is only illustrated with a ═ 4 in fig. 2. The resistance of the second wire 50 connected to the 1 st second touch electrode 20, the resistance of the second wire 50 connected to the 2 nd second touch electrode 20, and the resistance of the second wire 50 connected to the a-th second touch electrode 20 become larger gradually. From the description in the above related embodiments, it can be understood that, as the touch location is closer to the first side of the first touch electrode 10 in the first direction x, the number of the first electrode blocks 11 included in the touch detection loop is smaller, and the total resistance of the first electrode blocks 11 in the touch detection loop is also gradually reduced. In the embodiment of the present invention, the second wires 50 are all connected to the corresponding second touch electrodes 20 at the same side of the second touch electrodes 20 in the second direction y, and are arranged in the direction from the second side of the first touch electrode 10 to the first side, the resistance of the second wires 50 gradually increases, and the resistance load of the second wires 50 can be used to compensate the resistance load difference of the first electrode blocks 11 in the touch detection loops, so as to reduce the overall load difference in each touch detection loop, and improve the touch detection accuracy.
In some embodiments, fig. 3 is a schematic diagram of a touch detection circuit of a display panel according to an embodiment of the present invention, taking the display panel including b first touch electrodes 10 arranged in the second direction y and a second touch electrodes 20 arranged in the first direction x as an example, a and b are positive integers. The corresponding display panel includes b first traces 40 and a second traces 50. In the second direction y along the direction gradually approaching the bonding area, the 1 st first touch electrode 10_1, the 2 nd first touch electrode 10_2, and the b-th first touch electrode 10_ b are sequentially arranged. The b first touch electrodes 10 are connected to their respective corresponding first traces 40 on first sides in the first direction x; the 1 st second touch electrode 20_1, the 2 nd second touch electrode 20_2, and the a-th second touch electrode 20_ a are sequentially arranged from the second side of the first touch electrode to the first side in the first direction x. Fig. 3 illustrates that a capacitor 60 is formed between the first electrode block 11 of the first touch electrode 10 and the second electrode block 21 of the second touch electrode 20. The first electrode blocks 11 have the same resistance and the same resistance R1, and the second electrode blocks 21 have the same resistance and the same resistance R2.
When a touch occurs at the bit point D, which causes a capacitance value of the capacitor 60 between the first electrode block 11 in the nth first touch electrode 10_ n and the second electrode block 21 in the mth second touch electrode 20_ m to change, the mth second trace 50_ m connected to the mth second touch electrode 20_ m, the b + 1-nth second electrode block 21, the a + 1-mth first electrode block 11, the nth first trace 40_ n connected to the nth first touch electrode 10_ n, and a detection module (not shown in fig. 3) in the touch driving chip form a touch detection loop. The sum of the resistances of the electrode blocks and the wires in the panel in the touch detection loop is R2m+(b+1-n)*R2+(a+1-m)*R1+R1n. Wherein, R2mIs the resistance of the mth second trace 50_ m connected to the mth second touch electrode 20_ m, R1nIs the resistance of the nth first trace 40_ n connected to the nth first touch electrode 10_ n.
When a touch occurs at the bit C, which causes a capacitance value of the capacitor 60 between the first electrode block 11 in the 1 st first touch electrode 10_1 and the second electrode block 21 in the 1 st second touch electrode 20_1 to change, the 1 st second trace 50_1 connected to the 1 st second touch electrode 20_1, the b second electrode blocks 21, the a first electrode blocks 11, the 1 st first trace 40_1 connected to the 1 st first touch electrode 10_1, and the detection module in the touch driving chip form a touch detection loop. The sum of the resistances of the electrode blocks and the wires in the panel in the touch detection loop is R21+b*R2+a*R1+R11. Wherein, R21Is the resistance of the 1 st second trace 50_1 connected to the 1 st second touch electrode 20_1, R11Is the resistance of the 1 st first trace 40_1 connected to the 1 st first touch electrode 10_ 1.
In some embodiments of the present invention, each touch in the display panelThe resistive loads in the touch detection loops at the control positions are equal. Then the resistance loads in the touch detection loop where the location point D is located and the touch detection loop where the location point C is located are equal, and then the sum of the resistances of the electrode blocks and the traces in the panels in the two detection loops is substantially equal, so as to obtain a formula (1): r2m+(b+1-n)*R2+(a+1-m)*R1+R1n＝R21+b*R2+a*R1+R11。
When the position point D and the position point C are located on the same second touch electrode 20, m is equal to 1, and the formula (1) is substituted, so that R1 is obtained after simplificationn＝R11+ (n-1) R2. That is, there is a correlation between the resistance of the nth first trace 40_1 connected to the nth first touch electrode 10_ n and the resistance of the 1 st first trace 40_ 1.
When the position point D and the position point C are located on the same first touch electrode 10, n is equal to 1, and the formula (1) is substituted, so as to obtain R2 after simplificationm＝R21+ (m-1) R1. That is, there is a correlation between the resistance of the mth second trace 50_ m connected to the mth second touch electrode 20_ m and the resistance of the 1 st second trace 50_ 1.
In some embodiments of the present invention, the resistance R1 of the nth first trace 40_1nAnd resistance R1 of the 1 st first trace 40_11Satisfies formula (2): r1n＝R11+ (n-1) R2, wherein n is an integer of 1<n is less than or equal to b. In this embodiment, the difference between the resistances of the two first traces 40 respectively connected to the two adjacent first touch electrodes 10 is R2, R2 is the resistance of the single second electrode block 21, and R2 is a fixed value that can be known after the layout design of the first touch electrodes 10 and the second touch electrodes 20 in the panel is completed. When the plurality of first wires 40 are designed to be wired, the resistance of the first wires 40 connected to the first touch electrodes 10 can be gradually increased as the distance from the first touch electrodes 10 to the binding area is gradually decreased along the second direction y, so as to reduce the overall load difference in each touch detection loop. When the resistance of each second trace 50 is further designed in a matching manner, the overall loads in each touch detection loop can be basically the same, and the touch detection precision is improved.
In some embodiments of the inventionResistance R2 of the mth second trace 50_ mmAnd resistance R2 of the 1 st second trace 50_11Satisfies formula (3): r2m＝R21+ (m-1) R1, wherein m is an integer of 1<m is less than or equal to a. In this embodiment, the difference between the resistances of the two second traces 50 respectively connected to the two adjacent second touch electrodes 20 is R1, R1 is the resistance of a single first electrode block 11, and R1 is a fixed value that can be known after the first touch electrodes 10 and the second touch electrodes 20 in the panel are designed and arranged. When the wiring design is performed on the plurality of second traces 50, the resistance of the second trace 40 connected to the second touch electrode 20 gradually increases along with the direction in which the second side of the first touch electrode 10 points to the first side in the first direction x, and by regularly designing the resistance of each second trace 50 and regularly designing the resistance of each first trace 40, the overall load in each touch detection loop can be basically the same, and the touch detection accuracy is improved.
In other embodiments, fig. 4 is a schematic view of another display panel according to an embodiment of the present invention, as shown in fig. 4, a plurality of first touch electrodes 10 are sequentially arranged along a direction close to the bonding area 30 in the second direction y, wherein the first touch electrode 10 farthest from the bonding area 30 is the 1 st first touch electrode 10. The first touch electrode 10 includes a first side and a second side in the first direction x. Taking the right side of the schematic diagram of fig. 4 as the first side of the first touch electrode 10 and the left side as the second side of the first touch electrode 10 as an example, it can be seen that the 1 st first touch electrode 10 is connected to the first trace 40 at the first side, and the remaining second sides of the first touch electrodes 10 in the first direction x are connected to the first trace 40. By the arrangement, the load change in each touch detection loop at different touch positions in the display panel shows a certain rule. For example, in the first direction x, except for the 1 st touch electrode 10, as the touch position is closer to the second side of the first touch electrode 10, the number of the first electrode blocks 11 included in the touch detection loop is smaller, and the total resistive load of the first electrode blocks 11 in the touch detection loop is smaller; as the distance between the touch location point and the bonding area 30 in the second direction y is shorter, the number of the second electrode blocks 21 included in the touch detection loop is smaller, and the total resistive load of the second electrode blocks 21 in the touch detection loop is smaller. Therefore, the resistance of the first trace 40 and/or the resistance of the second trace 50 can be conveniently designed to reduce the load difference in each touch detection loop, so that the loss difference in each touch detection loop when transmitting the touch detection signal is basically the same, and the touch detection precision is improved.
In some embodiments, as shown in fig. 4, in a direction pointing from the second side of the first touch electrode 10 to the first side in the first direction x, i.e., in a direction pointing from the left side to the right side in fig. 4, the display panel includes a 1 st second touch electrode 20, a 2 nd second touch electrode 20, to an a-th second touch electrode 20, where a is only taken as an example in fig. 4. The resistance of the second wire 50 connected to the 2 nd second touch electrode 20 and the resistance of the second wire 50 connected to the 4 th second touch electrode 20 gradually decrease. In this embodiment, the remaining first touch electrodes 10 except for the 1 st first touch electrode 10 are all connected to the corresponding first traces 40 at the second sides (i.e., the left sides in fig. 4) in the first direction x, so that when a touch occurs on the remaining first touch electrodes 10 except for the 1 st first touch electrode 10, as the touch location is farther from the second sides of the first touch electrodes 10 in the first direction x, the greater the number of first electrode blocks 11 included in the touch detection loop, the total resistance of the first electrode blocks 11 in the touch detection loop also gradually increases. In this embodiment, in addition to the second trace 50 connected to the 1 st second touch electrode 20, the resistance of the second trace 50 connected to the 2 nd second touch electrode 20 and the resistance of the second trace 50 connected to the 4 th second touch electrode 20 are gradually decreased in the direction from the second side of the first touch electrode 10 to the first side, so that the resistance load of the second trace 50 can be used to compensate the resistance load difference of the first electrode 11 in the touch detection loops, thereby reducing the overall load difference in each touch detection loop and improving the touch detection accuracy.
In some embodiments, fig. 5 is a schematic view of another touch detection circuit of a display panel according to an embodiment of the present invention, as shown in fig. 5, the display panel includes b first touch electrodes 10 arranged in the second direction y and a second touch electrodes 20 arranged in the first direction x. The display panel includes b first traces 40 and a second traces 50. In the second direction y, along a direction gradually approaching the bonding region, the 1 st first touch electrode 10_1, the 2 nd first touch electrode 10_2, and the b-th first touch electrode 10_ b are sequentially arranged. The 1 st first touch electrode 10_1 is connected to the first trace 40 at a first side thereof, and the remaining first touch electrodes 10 are connected to the corresponding first trace 40 at second sides thereof. The 1 st second touch electrode 20_1, the 2 nd second touch electrode 20_2, and the a-th second touch electrode 20_ a are sequentially arranged from the second side of the first touch electrode to the first side in the first direction x. Fig. 5 illustrates that a capacitor 60 is formed between the first electrode block 11 of the first touch electrode 10 and the second electrode block 21 of the second touch electrode 20. The first electrode blocks 11 have the same resistance and the same resistance R1, and the second electrode blocks 21 have the same resistance and the same resistance R2.
When a touch occurs at the bit point D, which causes a capacitance value of the capacitor 60 between the first electrode block 11 in the nth first touch electrode 10_ n and the second electrode block 21 in the mth second touch electrode 20_ m to change, the mth second trace 50_ m connected to the mth second touch electrode 20_ m, the b + 1-nth second electrode block 21, the m first electrode blocks 11, the nth first trace 40_ n connected to the nth first touch electrode 10_ n, and a detection module (not shown in fig. 5) in the touch driving chip form a touch detection loop. The sum of the resistances of the electrode blocks and the wires in the panel in the touch detection loop is R2m+(b+1-n)*R2+m*R1+R1n. Wherein, R2mIs the resistance of the mth second trace 50_ m connected to the mth second touch electrode 20_ m, R1nIs the resistance of the nth first trace 40_ n connected to the nth first touch electrode 10_ n.
When a touch occurs at the bit point C, which causes a change in capacitance value of the capacitor 60 between the first electrode block 11 in the 1 st first touch electrode 10_1 and the second electrode block 21 in the 1 st second touch electrode 20_1, the 1 st second trace 50 \_connected to the 1 st second touch electrode 20_11. The b second electrode blocks 21, the a first electrode blocks 11, the 1 st first trace 40_1 connected to the 1 st first touch electrode 10_1, and the detection module in the touch driving chip form a touch detection loop. The sum of the resistances of the electrode blocks and the wires in the panel in the touch detection loop is R21+b*R2+a*R1+R11. Wherein, R21Is the resistance of the 1 st second trace 50_1 connected to the 1 st second touch electrode 20_1, R11Is the resistance of the 1 st first trace 40_1 connected to the 1 st first touch electrode 10_ 1.
In some embodiments of the present invention, the resistive loads in the touch detection loops at each touch position in the display panel are equal. Then the resistance loads in the touch detection loop where the location point D is located and the touch detection loop where the location point C is located are equal, and then the sum of the resistances of the electrode blocks and the traces in the panels in the two detection loops is substantially equal, so as to obtain a formula (4): r2m+(b+1-n)*R2+m*R1+R1n＝R21+b*R2+a*R1+R11。
When the position point D and the position point C are located on the same second touch electrode 20, m is 1, and the formula (4) is substituted, so that R1 is obtained after simplificationn＝R11+ (a-1) R1+ (n-1) R2. That is, the resistance R1 of the nth first trace 40_1 connected to the nth first touch electrode 10_ nnAnd resistance R1 of the 1 st first trace 40_11There is a correlation between them.
When the position point D and the position point C are located on the same first touch electrode 10, n is equal to 1, and the formula (4) is substituted, so as to obtain R2 after simplificationm＝R21+ (a-m) R1. That is, the resistance R2 of the mth second trace 50_ m connected to the mth second touch electrode 20_ mmAnd resistance R2 of the 1 st second trace 50_11There is a correlation between them.
In some embodiments of the present invention, the resistance R1 of the nth first trace 40_1nAnd resistance R1 of the 1 st first trace 40_11Satisfies formula (5): r1n＝R11+ (a-1) R1+ (n-1) R2, wherein n is an integer and 1<n is less than or equal to b. In this embodiment, the resistance difference between the two first traces 40 respectively connected to the two adjacent first touch electrodes 10The value R2, R2 are the resistance of the single second electrode block 21, and a and R2 are fixed values that can be known after the first touch electrode 10 and the second touch electrode 20 are designed and arranged in the panel. When the plurality of first wires 40 are designed to be wired, the resistance of the first wires 40 connected with the first touch electrodes 10 can be gradually increased along with the gradual decrease of the distance from the first touch electrodes 10 to the binding area in the second direction y, so that the overall load difference in each touch detection loop is reduced. When the resistance of each second trace 50 is further designed in a matching manner, the overall loads in each touch detection loop can be basically the same, and the touch detection precision is improved.
Further, in some embodiments, the resistance R2 of the mth second trace 50_ mmAnd resistance R2 of the 1 st second trace 50_11Satisfies formula (6): r2m＝R21+ (a-m) R1, m is an integer and 1<m is less than or equal to a. In this embodiment, except for the 1 st second touch electrode 20, the difference in resistance between the two second traces 50 respectively connected to the two adjacent second touch electrodes 20 is R1, R1 is the resistance of a single first electrode block 11, and a and R1 are fixed values that can be known after the layout design of the first touch electrode 10 and the second touch electrode 20 in the panel is completed. When the wiring design of the plurality of second traces 50 is performed, except for the 1 st second touch electrode, the resistance of the second trace 40 connected to the second touch electrode 20 gradually increases along with the direction in which the second side of the first touch electrode 10 points to the first side along the first direction x, and by regularly designing the resistance of each second trace 50 and regularly designing the resistance of each first trace 40, the overall load in each touch detection loop can be basically the same, and the touch detection accuracy is improved.
In some embodiments, the present invention can adopt any one of the following designs to realize that the resistance of the first sub-trace 41 is smaller than that of the second sub-trace 42.
In one embodiment, the length of the second sub-trace 42 is greater than the length of the first sub-trace 41. Fig. 6 is a partial schematic view of another display panel according to an embodiment of the invention, as shown in fig. 6, in the second direction y, a distance from the first touch electrode 10 connected to the first sub-trace 41 to the bonding area 30 is greater than a distance from the first touch electrode 10 connected to the second sub-trace 42 to the bonding area 30. When the same process is used, the second sub-trace 42 and the first sub-trace 41 have the same material, thickness and width. As shown in the area Q1 in fig. 6, the portion of the second sub-trace 42 is routed to increase the length of the second sub-trace 42, so that the length of the second sub-trace 42 is greater than the length of the first sub-trace 41, and thus the resistance of the first sub-trace 41 is smaller than the resistance of the second sub-trace 42, so as to reduce the load difference between the touch detection loop where the first sub-trace 41 is located and the touch detection loop where the second sub-trace 42 is located, thereby reducing the loss difference when the touch detection signals are transmitted in the two touch detection loops, and improving the touch detection accuracy.
In another embodiment, the line width of a part of the first sub-trace 41 is increased to reduce the overall resistance of the first sub-trace 41. Fig. 7 is a partially enlarged view of the area Q2 in fig. 2. As shown in fig. 7, in the region Q2, the line width d1 of the first sub-trace 41 is greater than the line width d2 of the second sub-trace 42. In this embodiment, the line width of at least a portion of the first sub-trace 41 is designed, and the line width of at least a portion of the first sub-trace 41 is set to be greater than the maximum line width of the second sub-trace 42, so that the overall resistance of the first sub-trace 41 is smaller than the resistance of the second sub-trace 42.
In another embodiment, the line width of at least a portion of the second sub-trace 42 is set to be smaller than the minimum line width 41 of the first sub-trace. The overall resistance of the second sub-trace 42 is increased by reducing the line width of at least a part of the second sub-trace 42, so that the overall resistance of the first sub-trace 41 is smaller than the resistance of the second sub-trace 42. Which are not illustrated in the drawings.
In another embodiment, fig. 8 is a schematic cross-sectional view at a position of a tangent line a-a' in fig. 2, as shown in fig. 8, where the first sub-trace 41 includes a first sub-portion 41a and a second sub-portion 41b connected in parallel. The first sub-portion 41a and the second sub-portion 41b are located on different metal layers, and the first sub-portion 41a and the second sub-trace 42 are located on the same layer. In this embodiment, at least a portion of the first sub-trace 41 is arranged to reduce the overall resistance of the first sub-trace 41 by using a parallel connection dual-layer trace, so that the overall resistance of the first sub-trace 41 is smaller than the resistance of the second sub-trace 42.
In some embodiments, fig. 9 is a schematic view of another display panel according to an embodiment of the present invention, as shown in fig. 9, the display panel includes a bending region 70, the bending region 70 is located between the first touch electrode 10 and the bonding region 30, and both the first trace 40 and the second trace 50 pass through the bending region 70 and then are connected to the corresponding bonding terminal 31. In this embodiment, the bending region 70 is located in the non-display region of the display panel, and the binding region 30 is disposed on the light emitting surface side away from the display panel after the bending region 70 is bent, so that the frame of the display panel can be narrowed.
In some embodiments, the length of the second sub-trace 42 located within the bending region 70 is set to be greater than the length of the first sub-trace 41 located within the bending region 70. Since the bending region 70 is located at the lower frame of the display panel and can be bent, the length of the second sub-trace 42 is increased in this region to make the resistance of the second sub-trace 42 greater than the resistance of the first sub-trace 41, so as to reduce the load difference between the touch detection loop where the first sub-trace 41 is located and the touch detection loop where the second sub-trace 42 is located, thereby reducing the loss difference when touch detection signals are transmitted in the two touch detection loops, and improving the touch detection accuracy. The design of this embodiment has substantially no effect on the bezel of the display panel.
In other embodiments, the line width of at least a portion of the first sub-trace 41 located in the bending region 70 is set to be greater than the maximum line width of the second sub-trace 42 located in the bending region 70. The line width of at least a portion of the first sub-trace 41 is increased within the bending region 70 to reduce the resistance of the first sub-trace 41, so that the resistance of the first sub-trace 41 is smaller than the resistance of the second sub-trace 42. The line width of the traces in the bending region 70 is adjusted, and the frame of the display panel is not affected.
In other embodiments, the line width of at least a portion of the second sub-trace 42 located in the bending region 70 is set to be smaller than the minimum line width of the first sub-trace located in the bending region 70; the line width of at least a portion of the second sub-trace 42 is reduced within the bending region 70 to increase the resistance of the second sub-trace 42, so that the resistance of the first sub-trace 41 is smaller than the resistance of the second sub-trace 42.
In other embodiments, at least a portion of the first sub-trace 41 disposed in the bending region 70 includes a first sub-portion and a second sub-portion connected in parallel. The overall resistance of the first sub-trace 41 is reduced by adopting a parallel connection double-layer trace manner, so that the overall resistance of the first sub-trace 41 is smaller than that of the second sub-trace 42.
Fig. 10 is a schematic view of a display device according to an embodiment of the present invention, and as shown in fig. 10, the display device includes a display panel 100 according to any embodiment of the present invention. The structure of the display panel has been described in the above embodiments, and is not described herein again. The display device in the embodiment of the invention can be any equipment with a display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic book, a television, an intelligent watch and the like.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (13)

1. A display panel is characterized by comprising a plurality of first touch electrodes extending in a first direction and arranged in a second direction, a plurality of second touch electrodes extending in the second direction and arranged in the first direction, wherein the first direction and the second direction are crossed;
the first touch electrode comprises a plurality of first electrode blocks, and two adjacent first electrode blocks are electrically connected through a first connecting part; the second touch electrode comprises a plurality of second electrode blocks, and two adjacent second electrode blocks are electrically connected through a second connecting part; the first connecting part and the second connecting part are crossed in an insulating way;
the display panel further comprises a binding area, a first wire and a second wire; the bonding region includes a plurality of bonding terminals, and the bonding region is located on one side of the first touch electrode in the second direction; one end of the first wire is connected with one first touch electrode, the other end of the first wire is connected with one binding terminal, one end of the second wire is connected with one second touch electrode, and the other end of the second wire is connected with one binding terminal;
the first routing comprises a first sub-routing and a second sub-routing, the resistance of the first sub-routing is smaller than that of the second sub-routing, and the first touch electrode connected with the first sub-routing is located on one side, far away from the binding area, of the first touch electrode connected with the second sub-routing.
2. The display panel according to claim 1,
the display panel comprises b first touch electrodes, wherein b is a positive integer; the distances from the 1 st first touch electrode, the 2 nd first touch electrode and the b th first touch electrode to the binding area gradually decrease;
the resistance of the first wire connected with the 1 st first touch electrode, the resistance of the first wire connected with the 2 nd first touch electrode, and the resistance of the first wire connected with the b-th first touch electrode become larger gradually.
3. The display panel according to claim 3,
the first touch control electrodes comprise a first side and a second side in the first direction, and the b first touch control electrodes are connected with the corresponding first routing lines on the first side.
4. The display panel according to claim 3,
the resistance of the first wire connected with the 1 st first touch electrode is R11，
The resistance of the first wire connected with the nth first touch electrode is R1nN is an integer, and 1<n≤b；
R1n＝R11+ (n-1) R2, wherein R2 is the resistance of a single said second electrode block.
5. The display panel according to claim 3,
in a direction pointing from the second side to the first side, the display panel includes the 1 st second touch electrode, the 2 nd second touch electrode, to the a-th second touch electrode;
the resistance of the second wire connected with the 1 st second touch electrode, the resistance of the second wire connected with the 2 nd second touch electrode, and the resistance of the second wire connected with the a-th second touch electrode become larger gradually.
6. The display panel according to claim 5,
the resistance of the second wire connected with the 1 st second touch electrode is R21，
The resistance of the second wire connected with the mth second touch electrode is R2mM is an integer, and 1<m≤a；
R2m＝R21+ (m-1) R1, wherein,
r1 is the resistance of a single said first electrode block.
7. The display panel according to claim 2,
the first touch electrode comprises a first side and a second side in the first direction; the 1 st first touch electrode is connected with the first wire on the first side in the first direction, and the rest first touch electrodes are connected with the first wire on the second side in the first direction.
8. The display panel according to claim 7,
the resistance of the first wire connected with the 1 st first touch electrode is R11，
The resistance of the first wire connected with the nth first touch electrode is R1nN is an integer, and 1<n≤b；
R1n＝R11+ (a-1) R1+ (n-1) R2, wherein,
r1 is the resistance of single first electrode piece, R2 is the resistance of single second electrode piece, a is the number of second touch-control electrodes in the display panel.
9. The display panel according to claim 7,
in a direction pointing from the second side to the first side, the display panel includes the 1 st second touch electrode, the 2 nd second touch electrode, to the a-th second touch electrode;
the resistance of the second wire connected with the 2 nd second touch electrode and the resistance of the second wire connected with the a nd second touch electrode gradually decrease.
10. The display panel according to claim 9,
the resistance of the second wire connected with the 1 st second touch electrode is R21，
The resistance of the second wire connected with the mth second touch electrode is R2mM is an integer, and 1<m≤a；
R2m＝R21+ (a-m) R1, wherein R1 is the resistance of a single said first electrode block.
11. The display panel of claim 1, wherein at least one of the following is satisfied between the first sub-trace and the second sub-trace:
the length of the second sub-routing is greater than that of the first sub-routing;
the line width of at least part of the first sub-routing is larger than the maximum line width of the second sub-routing;
the line width of at least part of the second sub-routing is smaller than the minimum line width of the first sub-routing;
at least part of the first sub-trace comprises a first sub-part and a second sub-part which are connected in parallel.
12. The display panel according to claim 1,
the display panel comprises a bending area, the bending area is located between the first touch electrode and the binding area, and the first routing wire and the second routing wire penetrate through the bending area and then are connected to the corresponding binding terminals;
at least one of the following is satisfied between the first sub-trace and the second sub-trace:
the length of the second sub-routing in the bending area is greater than that of the first sub-routing in the bending area;
the line width of at least part of the first sub-routing in the bending area is larger than the maximum line width of the second sub-routing in the bending area;
the line width of at least part of the second sub-routing in the bending area is smaller than the minimum line width of the first sub-routing in the bending area;
at least part of the first sub-trace located in the bending area comprises a first sub-portion and a second sub-portion which are connected in parallel.
13. A display device characterized by comprising the display panel according to any one of claims 1 to 12.
CN202111529722.2A 2021-12-14 2021-12-14 Display panel and display device Active CN114168017B (en)

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