CN107506071B - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN107506071B CN107506071B CN201710646770.7A CN201710646770A CN107506071B CN 107506071 B CN107506071 B CN 107506071B CN 201710646770 A CN201710646770 A CN 201710646770A CN 107506071 B CN107506071 B CN 107506071B
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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
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/13338—Input devices, e.g. touch panels
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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
Abstract
The application discloses display panel and display device relates to and shows technical field, and display panel includes: the touch control electrodes are arranged in the display area in an array mode along a first direction and a second direction and comprise a plurality of first touch control electrodes and at least one second touch control electrode, and the capacitance value C of each first touch control electrode1Equal capacitance C of the second touch electrode2A capacitance value C smaller than that of the first contact electrode1(ii) a Touch signal leads electrically connected with the touch electrodes in a one-to-one correspondence manner; the control chip is electrically connected with the touch signal lead and sends a driving voltage signal to each touch electrode through the touch signal lead; when no touch is made, the average electric quantity Q of the first touch electrode is in the same time1Average electric quantity Q of the second touch electrode2Are equal. Therefore, the second touch electrode with a smaller capacitance value can better detect the occurrence of touch, which is beneficial to improving the touch performance of the display panel and the display device.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a display panel and a display device.
Background
With the development of science and technology, the display device with the display panel has more and more extensive applications, so that the requirements of people on the display panel are more and more diversified, the requirements are not only met with the conventional performance indexes of the display panel, such as large size, high definition and the like, but also more diversified requirements are met on the appearance of the display panel, and the special-shaped display panel is formed.
The appearance of the special-shaped display panel breaks through the limitation of a single rectangular structure of the display panel, so that not only the display effect is more diversified, but also the application way of the display panel is more and more extensive, and the special-shaped display panel is successfully applied to wearable electronic designs such as watches, glasses or intelligent bracelets. Compared with the conventional display screen, the special-shaped display screen mainly differs in that the display area of the special-shaped display screen is in a non-rectangular special shape, and generally, the touch electrodes in the display screen are in a rectangular structure or other more regular structures, so when the special-shaped display screen is applied to the special-shaped display screen, referring to fig. 1, fig. 1 is a schematic structural diagram of the special-shaped display screen provided by the prior art, in the edge area of the display screen 300, part of the touch electrodes 301 are in an irregular shape, and the area is smaller than the area of the touch electrodes 302 located in the non-edge area, so that the basic capacitance value of the part of the touch electrodes 301 with the irregular shape is also smaller than the basic capacitance value of the touch electrodes 302 located in the non-edge area, and when the same touch driving signal is sent to each touch electrode on the display panel, the touch amount of the touch electrodes 301 with the smaller area is smaller than, therefore, when the edge region of the display screen is touched, the occurrence of the edge region touch is likely to be undetectable, and the display panel is further poor in touch performance.
Disclosure of Invention
In view of the above, the present disclosure provides a display panel and a display device, wherein the average electric quantity Q of a first touch electrode is equal to the average electric quantity Q of a second touch electrode in the same time period when no touch is made1Average electric quantity Q of the second touch electrode2Therefore, the occurrence of touch can be better detected at the second touch electrode with smaller capacitance value, which is beneficial to improving the touch performance of the display panel and the display device.
In order to solve the technical problem, the following technical scheme is adopted:
in a first aspect, the present application provides a display panel provided with a display area and a non-display area surrounding the display area, wherein the display panel includes:
the touch control electrodes are arranged in the display area in an array mode along a first direction and a second direction and comprise a plurality of first touch control electrodes and at least one second touch control electrode, and the capacitance value C of each first touch control electrode1Equal, capacitance value C of the second touch electrode2A capacitance value C smaller than the first touch electrode1；
Touch signal leads electrically connected with the touch electrodes in a one-to-one correspondence manner;
the control chip is electrically connected with the touch signal lead wire and sends a driving voltage signal to each touch electrode through the touch signal lead wire;
when no touch is made, the average electric quantity Q of the first touch electrode is in the same time1Average electric quantity Q of the second touch electrode2Are equal.
Optionally, wherein:
in the same time, the driving voltage signal sent by the control chip to the first touch electrode comprises m pulse signals, and the electric quantity generated by the first touch electrode is Q respectively corresponding to each pulse signal11、Q12、Q13、……Q1mAverage electric quantity Q of the first touch electrode1＝(Q11+Q12+Q13+……+Q1m)/m；
In the same time, the driving voltage signal sent by the control chip to the second touch electrode includes n pulse signals, and the electric quantity generated by the second touch electrode is respectively Q corresponding to each pulse signal21、Q22、Q23、……Q2nAverage electric quantity Q of the second touch electrode2＝(Q21+Q22+Q23+……+Q2n)/n。
Optionally, wherein:
in the same time, the control chip sends a voltage value V of a driving voltage signal to the first touch electrode1A voltage value V smaller than the driving voltage signal sent to the second touch electrode2And C is1*V1＝C2*V2。
Optionally, wherein:
in the same time, the control chip sends a voltage value V of a driving voltage signal to the second touch electrode2And a voltage value V of a driving voltage signal sent to the first touch electrode1The frequency f of the driving voltage signal sent by the control chip to the first touch electrode is equal1Less than the frequency f of the driving voltage signal sent to the first touch electrode2，f1/f2＝C2/C1。
Optionally, wherein:
at the same timeIn the touch control device, the voltage value V of the driving voltage signal sent by the control chip to the second touch control electrode2And a voltage value V of a driving voltage signal sent to the first touch electrode1The frequency f of the driving voltage signal sent by the control chip to the first touch electrode is equal1Is equal to the frequency f of the driving voltage signal sent to the first touch electrode2；
The display panel further comprises a calibration module, and the calibration module is used for calibrating the first touch electrode according to the capacitance value C of the first touch electrode1And a capacitance value C of the second touch electrode2Acquiring a calibration coefficient A, wherein the calibration module is used for calibrating the electric quantity of the second touch electrode when receiving the nth pulse signal sent by the control chip, so that the electric quantity of the second touch electrode when receiving the nth pulse signal sent by the control chip is Q when no touch occurs2n＝C2*V2A, wherein a is a calibration coefficient.
Optionally, wherein:
calibration factor a ═ C2/C1，Q2n＝C2*V2*C1/C2＝C1*V2；
When no touch is made, the electric quantity of the first touch electrode when the first touch electrode receives the mth pulse signal sent by the control chip is Q1m＝C1*V1。
Optionally, wherein:
in the touch stage, the average total electric quantity Q of the second touch electrode is in the same time2' average total charge Q with the first touch electrode1' equal.
Optionally, wherein:
the area of the first touch electrode is S1In the touch stage, the contact area between the touch medium and the first touch electrode is S1' the capacitance variation of the first touch electrode is △ C1Wherein △ C1＝S1’*C1/S1。
Optionally, wherein:
the area of the second touch electrode is S2In the touch stage, the contact area between the touch medium and the second touch electrode is S2' the capacitance variation of the second touch electrode is △ C2Wherein △ C2＝S2’*C2/S2。
Optionally, wherein:
the display area is a special-shaped area, and a boundary line of the special-shaped area is intersected with the first direction and/or the second direction;
the second touch electrode is located at the boundary of the special-shaped area, and the area of the second touch electrode is smaller than that of the first touch electrode.
In a second aspect, the present application further provides a display device, including a display panel, where the display panel is the display panel provided in the present application.
Compared with the prior art, this application display panel and display device, reached following effect:
the display panel and the display device provided by the invention comprise a plurality of touch electrodes arranged in an array along a first direction and a second direction, wherein the touch electrodes comprise a plurality of first touch electrodes with equal capacitance values and at least one second touch electrode, and the capacitance value of the second touch electrode is smaller than that of the first touch electrode. Particularly, when no touch is made, the average electric quantity of the first touch electrode with the larger capacitance value is equal to the average electric quantity of the second touch electrode with the smaller capacitance value in the same time, so that the touch quantity sensed by the second touch electrode with the smaller capacitance value is equal to or close to the touch quantity sensed by the first touch electrode with the larger capacitance value during touch, the phenomenon that the touch electrode with the smaller capacitance value cannot detect the touch in the prior art is solved, and the touch performance of the display panel and the display device provided by the application is favorably improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a schematic diagram of a prior art display screen with a special shape;
fig. 2 is a top view of a display panel provided in the present application;
FIG. 3 is a top view of another display panel provided herein;
fig. 4 is an equivalent circuit diagram of a first touch electrode and a second touch electrode in the display panel provided by the present application;
fig. 5 is another equivalent circuit diagram of a first touch electrode and a second touch electrode in the display panel provided by the present application;
fig. 6 is another equivalent circuit diagram of a first touch electrode and a second touch electrode in the display panel provided by the present application;
FIG. 7 is a top view of another embodiment of a display panel of the present application;
fig. 8 is another equivalent circuit diagram of a first touch electrode and a second touch electrode in the display panel provided by the present application;
FIG. 9 is a cross-sectional view of a display panel provided by the present application;
fig. 10 is a circuit configuration diagram of a display panel provided in the present application;
FIG. 11 is a cross-sectional view of another display panel provided by the present application;
fig. 12 is a schematic structural diagram of a display device provided in the present application.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect. Furthermore, the term "coupled" is intended to encompass any direct or indirect electrical coupling. Thus, if a first device couples to a second device, that connection may be through a direct electrical coupling or through an indirect electrical coupling via other devices and couplings. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.
Referring to fig. 2, which is a plan view of a display panel provided in the present application, and fig. 3, which is another plan view of a display panel provided in the present application, referring to fig. 2 and 3, the present application provides a display panel 100 provided with a display area 11 and a non-display area 12 surrounding the display area 11, wherein the display panel 100 includes:
a plurality of touch electrodes arranged in an array along a first direction and a second direction in the display area 11, the touch electrodes including a plurality of first touch electrodes 21 and at least one second touch electrode 22, a capacitance value C of each first touch electrode 211Equal, capacitance C of the second touch electrode 222A capacitance value C smaller than that of the first touch electrode1；
Touch signal leads 20 electrically connected to the respective touch electrodes in a one-to-one correspondence;
the control chip 10 is electrically connected with the touch signal lead 20, and the control chip 10 sends a driving voltage signal to each touch electrode through the touch signal lead 20;
in the absence of touch, the average electric quantity Q of the first touch electrode 21 is equal to the average electric quantity Q of the second touch electrode 21 in the same time1Average electric quantity Q of the second touch electrode 222Are equal.
It should be noted that, in the present application, the capacitance values of the first touch electrode 21 and the second touch electrode 22 refer to basic capacitance values of the first touch electrode 21 and the second touch electrode 22, that is, capacitances formed between the first touch electrode 21 and the second touch electrode 22 and ground respectively. In the present application, the first touch electrode 21 and the second touch electrode 22 are both self-capacitance electrodes. In the touch stage, the first touch electrode 21 and the second touch electrode 22 respectively receive a touch driving signal sent by the control chip 10 through the touch signal lead 20; when sensing an external touch, the touch electrode sends a touch sensing signal to the control chip 10 through the touch signal lead 20. When a touch occurs, a capacitance is generated between the touch electrode at the corresponding touch position and a touch medium (such as a finger), so that the total capacitance of the touch electrode at the touch position changes, and the control chip can judge which capacitance of the touch electrode changes through the received touch sensing signal, so as to determine the touch position.
Specifically, referring to fig. 2, the display panel 100 includes a display area 11 and a non-display area 12, and the display area 11 is shaped in a special shape. In the present application, the special-shaped display area 11 mainly refers to a non-rectangular area, and as shown in fig. 2, the display area 11 is a circle, and besides this form, the display area can also be embodied as other areas with structures such as a sector, an ellipse, a triangle, a hexagon, and the like, which is not particularly limited in this application. Referring to fig. 2 and 3, the touch electrodes with regular shapes located in the non-edge area and the edge area of the display area 11 are the first touch electrodes 21, the capacitance values of the first touch electrodes 21 are equal, the touch electrodes located in the edge area of the display area 11 are the second touch electrodes 22, the shapes of the second touch electrodes 22 are irregular, and the first touch electrodes 21 and the second touch electrodes 22 are respectively connected to the control chip 10 through the touch signal lead 20 and receive the driving voltage signal sent by the control chip 10 through the touch signal lead 20. In fig. 3, the area of the second touch electrode 22 located at the edge region of the display area 11 is smaller than the area of the first touch electrode 21, and the capacitance value of the second touch electrode 22 is smaller than the capacitance value of the first touch electrode 21, especially, when there is no touch, the average electric quantity of the first touch electrode 21 is equal to the average electric quantity of the second touch electrode 22 within the same time range, so that, when there is no touch, the touch quantity sensed by the second touch electrode 22 with smaller capacitance value is equal to or close to the touch quantity sensed by the first touch electrode 21 with larger capacitance value, which solves the problem in the prior art that the touch electrode with smaller capacitance value cannot detect the occurrence of touch, and is beneficial to improving the touch performance of the display panel 100 provided by the present application.
Optionally, in the same time, the driving voltage signal sent by the control chip 10 to the first touch electrode 21 includes m pulse signals, and the electric quantity generated by the first touch electrode 21 corresponding to each pulse signal is Q11、Q12、Q13、……Q1mAverage electric quantity Q of the first touch electrode 211＝(Q11+Q12+Q13+……+Q1m)/m；
In the same time, the driving voltage signal sent by the control chip 10 to the second touch electrode 22 includes n pulse signals, and the electric quantity generated by the second touch electrode 22 corresponding to each pulse signal is Q21、Q22、Q23、……Q2nAverage electric quantity Q of the second touch electrode2＝(Q21+Q22+Q23+……+Q2n)/n。
When the display panel 100 in the present application is in a touch stage, the control chip 10 sends driving voltage signals to the first touch electrodes 21 with larger capacitance values and the second touch electrodes 22 with smaller capacitance values through the touch signal leads 20, and when a touch signal is sensed, the first touch electrodes 21 or the second touch electrodes 22 feed back the touch sensing signal to the control chip 10 through the touch signal leads 20. Generally, the driving voltage signals sent by the control chip 10 to each touch electrode are all embodied in the form of pulses, within a period of time, the control chip 10 sends out a plurality of pulse signals, and each touch electrode generates an electric quantity after receiving one pulse signal. Therefore, for the first touch electrode 21, when m pulse signals sent by the control chip 10 are received in the same time, in the period of time, the first touch electrode is touchedAverage electric quantity Q of electrode 211The average electric quantity Q of the first touch electrode 21 can be obtained by averaging the electric quantities generated by the first touch electrode 21 after receiving the pulse signals1＝(Q11+Q12+Q13+……+Q1m) (ii)/m; similarly, for the second touch electrode 22, when n pulse signals sent by the control chip 10 are received in the same time, the average electric quantity Q of the second touch electrode 22 in the time2The average electric quantity Q of the second touch electrode 22 can be obtained by averaging the electric quantity generated by the second touch electrode 22 after receiving each pulse signal2＝(Q21+Q22+Q23+……+Q2n)/n。
So that the average charge Q of the first touch electrode 21 is equal to the average charge Q of the second touch electrode 21 during the same time period when no touch is made1Average electric quantity Q of the second touch electrode 222The present application can be implemented in the following ways.
Optionally, as an embodiment of the present application, in the same time, the voltage value V of the driving voltage signal sent by the control chip 10 to the first touch electrode 211Is less than the voltage value V of the driving voltage signal transmitted to the second touch electrode 222And C is1*V1＝C2*V2。
Specifically, fig. 4 is an equivalent circuit diagram of a first touch electrode and a second touch electrode in the display panel provided by the present application, referring to fig. 4, considering a capacitance value C of the second touch electrode 222A capacitance value C smaller than that of the first touch electrode 211In this embodiment, in the same time, the number of the pulse signals sent by the control chip 10 to the first touch electrode 21 is the same as the number of the pulse signals sent to the second touch electrode 22, the voltage value of the driving voltage signal sent by the control chip 10 to the second touch electrode 22 is greater than the voltage value of the driving voltage sent to the first touch electrode 21, and C is set to be greater than C1*V1＝C2*V2. Specifically, assume that the capacitance value C of the first touch electrode 21 is in a case of no touch11pf, second touchCapacitance C of control electrode 222When the first touch electrode 21 is driven by a driving voltage signal of 2.5V and the second touch electrode 22 is driven by a driving voltage signal of 5V, the time of a single pulse of the driving voltage signal transmitted to the first touch electrode 21 and the second touch electrode 22 is 9 μ s, so that the electric quantity Q generated by the first touch electrode 21 when one pulse signal is received1m＝C1*V1The second touch electrode 22 generates an electric quantity Q of 2.5 coulombs, 1pf, 2.5V2n＝C2*V20.5pf 5V 2.5 coulomb. In this way, by increasing the driving voltage transmitted to the second touch electrode 22 with smaller capacitance, the second touch electrode 22 with smaller capacitance is driven by a larger driving voltage, and the second touch electrode 22 with larger capacitance is driven by a smaller driving voltage, and C is enabled1*V1＝C2*V2This ensures that the average charge Q of the first touch electrode 21 is equal to the average charge Q of the first touch electrode 21 in the absence of touch at the same time1Average electric quantity Q capable of being compared with the second touch electrode 222Are equal. Because the electric quantity of the second touch electrode 22 is equal to the electric quantity of the first touch electrode 21 when no touch occurs, when a touch occurs at the position of the second touch electrode 22 with a smaller capacitance value, the touch quantity sensed by the second touch electrode 22 with a smaller capacitance value is equal to or close to the touch quantity sensed by the first touch electrode 21 with a larger capacitance value, which solves the problem that the touch electrode with a smaller capacitance value in the prior art cannot detect the occurrence of touch, and is beneficial to improving the touch performance of the display panel 100 provided by the present application.
Optionally, as another embodiment of the present application, in the same time, the voltage value V of the driving voltage signal sent by the control chip 10 to the second touch electrode 222And the voltage value V of the driving voltage signal sent to the first touch electrode 211The same, and the frequency f of the driving voltage signal sent by the control chip 10 to the first touch electrode 211Is less than the frequency f of the driving voltage signal transmitted to the first touch electrode 212，f1/f2＝C2/C1。
Specifically, fig. 5 is another equivalent circuit diagram of a first touch electrode and a second touch electrode in the display panel provided by the present application, referring to fig. 5, in this embodiment, in the same time period, the number of pulse signals sent by the control chip 10 to the first touch electrode 21 is smaller than the number of pulse signals sent to the second touch electrode 22, that is, the frequency f of the driving voltage signal sent by the control chip 10 to the first touch electrode 211Is less than the frequency f of the driving voltage signal transmitted to the second touch electrode 222And f is1/f2＝C2/C1. In this embodiment, the control chip 10 sends a pulse signal to the second touch electrode 22 twice within 9 μ s, and sends a pulse signal to the first touch electrode 21, and the voltage value of the driving voltage signal sent by the control chip 10 to the second touch electrode 22 is equal to the voltage value of the driving voltage sent to the first touch electrode 21, and is 5V, in this embodiment, it is assumed that the capacitance value of the first touch electrode 21 is 1pf, the capacitance value of the second touch electrode 22 is 0.5pf, and the electric quantity Q generated by the first touch electrode 21 within 9 μ s1m＝C1*V11pf by 5V by 5 coulombs, the second touch electrode 22 generates the electric quantity Q2n＝C2*V2+C2*V22 × 0.5pf × 5V ═ 5 coulombs. Thus, when no touch occurs, the electric quantity generated by the first touch electrode 21 is equal to the electric quantity generated by the second touch electrode 22 in the same time, and when a touch occurs at the position of the second touch electrode 22 with a smaller capacitance value, the touch quantity sensed by the second touch electrode 22 with a smaller capacitance value is equal to or similar to the touch quantity sensed by the first touch electrode 21 with a larger capacitance value, thereby solving the problem that the touch electrode with a smaller capacitance value in the prior art cannot detect the occurrence of the touch, and being beneficial to improving the touch performance of the display panel 100 provided by the present application.
Optionally, as another embodiment of the present application, the driving voltage signal sent by the control chip 10 to the second touch electrode 22 is sent at the same timeVoltage value V of horn2And the voltage value V of the driving voltage signal sent to the first touch electrode 211The same, and the frequency f of the driving voltage signal sent by the control chip 10 to the first touch electrode 211Equal to the frequency f of the driving voltage signal sent to the first touch electrode 212；
As shown in fig. 7, the display panel 100 further includes a calibration module 90, and the calibration module 90 is configured to calibrate the capacitance value C of the first touch electrode 211And the capacitance C of the second touch electrode 222A calibration coefficient a is obtained, and the calibration module 90 is configured to calibrate the electric quantity of the second touch electrode 22 when receiving the nth pulse signal sent by the control chip 10, so that when there is no touch, the electric quantity of the second touch electrode 22 when receiving the nth pulse signal sent by the control chip 10 is Q2n＝C2*V2A, wherein a is a calibration coefficient.
Specifically, fig. 6 is another equivalent circuit diagram of a first touch electrode and a second touch electrode in the display panel provided by the present application, referring to fig. 6, in this embodiment, in the same time, the number of pulse signals sent by the control chip 10 to the first touch electrode 21 is the same as the number of pulse signals sent to the second touch electrode 22, that is, the frequency f of the driving voltage signal sent by the control chip 10 to the first touch electrode 21 is the same as the frequency f of the driving voltage signal sent by the control chip 10 to the second touch electrode 221Equal to the frequency f of the driving voltage signal sent to the first touch electrode 212In 9 μ s, the control chip 10 sends a pulse signal to the first touch electrode 21 and sends a pulse signal to the second touch electrode 22, and the voltages of the driving voltage signals sent to the first touch electrode 21 and the second touch electrode 22 are both 5V. So that the average charge Q of the first touch electrode 21 is equal to the average charge Q of the second touch electrode 21 during the same time period when no touch is made1Average electric quantity Q of the second touch electrode 222In the same way, in the present embodiment, the calibration module 90 is introduced into the display panel 100 to calibrate the electric quantity of the second touch electrode 22, referring to fig. 7, fig. 7 is another top view of the display panel provided in the present application, and the calibration module 90 calibrates the electric quantity of the second touch electrode 22 according to the capacitance value of the first touch electrode 21 and the electric quantity of the second touch electrode 22A calibration coefficient a is obtained from the capacitance value, and the electric quantity of the second touch electrode 22 when receiving the nth pulse signal sent by the control chip 10 is calibrated by using the calibration coefficient a, so that Q is obtained2n＝C2*V2A. Unlike the manner in which the voltage and frequency of the drive signal are adjusted in the embodiments shown in fig. 4 and 5, this embodiment incorporates a calibration module 90, the calibration coefficient a calculated by the calibration module 90 calibrates the electric quantity of the second touch electrode 22 with a smaller capacitance value, so that in the same time, when no touch occurs, the average electric quantity generated by the first touch electrode 21 is equal to the average electric quantity generated by the second touch electrode 22, therefore, when a touch occurs at the position of the second touch electrode 22 with a smaller capacitance value, the touch amount sensed by the second touch electrode 22 with a smaller capacitance value is equal to or similar to the touch amount sensed by the first touch electrode 21 with a larger capacitance value, which solves the problem that the touch cannot be sensed by the touch electrode with a smaller capacitance value in the prior art, and is also beneficial to improving the touch performance of the display panel 100 provided by the present application.
It should be noted that the calibration module 90 in the present application may be separately disposed in the display panel 100, or may be integrated in the control chip 10 to reduce the frame width of the display panel 100, and the present application is not limited thereto. The calibration module 90 can obtain the capacitance values of the first touch electrodes 21 and the second touch electrodes 22, and obtain the calibration coefficient according to the relationship between the capacitance values of the second touch electrodes 22 and the first touch electrodes 21.
Optionally, the calibration factor a ═ C above2/C1，Q2n＝C2*V2*C1/C2＝C1*V2(ii) a When there is no touch, the electric quantity of the first touch electrode 21 when receiving the m-th pulse signal sent by the control chip 10 is Q1m＝C1*V1. Specifically, the calibration coefficient is set to a ═ C2/C1In the absence of touch, the electric quantity of the second touch electrode 22 when receiving the nth pulse signal sent by the control chip 10 is Q2n＝C1*V2Due to the first touch electrode21 the electric quantity when receiving the m-th pulse signal sent by the control chip 10 is Q1m＝C1*V1Due to the driving voltage V of the driving signal sent by the control chip 10 to the first touch electrode 211And the driving voltage V of the driving signal sent to the second touch electrode 222Are equal, therefore, C1*V2＝C1*V1And then Q2n＝Q1mThat is, in the absence of touch, the electric quantity of the second touch electrode 22 when receiving the nth pulse signal sent by the control chip 10 is equal to the electric quantity of the first touch electrode 21 when receiving the mth pulse signal sent by the control chip 10.
Optionally, as another embodiment of the present application, please refer to fig. 8, and fig. 8 is another equivalent circuit diagram of a first touch electrode and a second touch electrode in a display panel provided by the present application, in the present embodiment, in the same time, the number of the pulse signals sent by the control chip 10 to the first touch electrode 21 is the same as the number of the pulse signals sent to the second touch electrode 22, that is, the frequency f of the driving voltage signal sent by the control chip 10 to the first touch electrode 211Equal to the frequency f of the driving voltage signal sent to the first touch electrode 212In 9 μ s, the control chip 10 sends a pulse signal to the first touch electrode 21 and sends a pulse signal to the second touch electrode 22, and the voltage of the driving voltage signals sent by the first touch electrode 21 and the second touch electrode 22 is 5V, and the capacitance value of the first touch electrode 21 is C1The capacitance value of the second touch electrode 22 is C when the touch panel is set to 1pf20.5 pf. In this case as shown in fig. 8, the average charge Q of the first touch electrode 21 can be obtained by a specific algorithm when there is no touch and the average charge Q is within the same time1Average electric quantity Q of the second touch electrode 222Are equal. Assuming that the number of pulses sent by the control chip 10 to the first touch electrode 21 and the second touch electrode 22 is 14 in the same time, consider C20.5pf, and C11pf, then, for the second touch electrode 22, the received two adjacent pulses can be regarded as one pulseThe unit pulse is such that the second touch electrode 22 receives 7 unit pulses, that is, the second touch electrode 22 receives 7 unit pulses within the same time, where n equals 7, and the electric quantity of the two adjacent pulses is superimposed to be Q2n，Q2n＝2*C2*V22 × 0.5pf × 5V ═ 5 coulombs. Since the first touch electrode 21 receives a pulse signal Q1m＝C1*V11pf 5V 5 coulomb, thus Q2n＝Q1mThereby realizing the average electric quantity Q of the first touch electrode 21 in the same time when no touch is made1Average electric quantity Q of the second touch electrode 222Are equal.
Of course, the embodiments of fig. 4 to 8 only show the average electric quantity Q of the first touch electrode 21 in the same time without touch1Average electric quantity Q of the second touch electrode 222The present application may also adopt other feasible manners to achieve the above-mentioned objectives, and the present application is not limited to the specific implementation manners.
Optionally, in the touch stage, the average total charge Q of the second touch electrode 22 is measured in the same time period2' average total charge Q with the first touch electrode 211' equal.
Specifically, when a finger touches the display panel 100, a capacitance is generated between the finger and the touch electrode, so that the capacitance at the touch electrode changes based on the original basic capacitance, and increases by a certain amount, and the total electric quantity of the first touch electrode 21 refers to the basic capacitance C of the first touch electrode 21 when the touch occurs1And the sum of the capacitance values between the finger and the first touch electrode 21, the total amount of electricity of the second touch electrode 22 refers to the basic capacitance value C of the second touch electrode 22 when a touch occurs2And the sum of the capacitance between the finger and the second touch electrode 22. Average total electric quantity Q of the first touch electrode 211' is obtained by averaging the total electric quantity of the first touch electrode 21 for a plurality of times in the same time, and the average total electric quantity Q of the second touch electrode 222' is determined by counting the total power of the second touch electrode 22 several times in the same timeThe average quantity is calculated by a method similar to the average quantity Q of electricity of the first touch electrode 21 in the same time without touch1And the average electric quantity Q of the second touch electrode 222The calculation method of (2) is not described herein again. The average total electric quantity Q of the second touch electrode 22 in the same time in the touch stage is determined2' set average total charge Q with the first touch electrode 211' equals, in this way, it can be ensured that the second touch electrode 22 with a smaller capacitance value can also accurately detect the touch sensing signal when being touched, and can send the touch sensing signal to the control chip 10, so that the improvement of the touch performance at the edge of the display area 11 of the special-shaped display panel 100 is facilitated, and the improvement of the overall touch performance of the display panel 100 is facilitated.
Optionally, the area of the first touch electrode 21 is S1In the touch stage, the contact area between the touch medium and the first touch electrode 21 is S1' the capacitance variation of the first touch electrode 21 is △ C1Wherein △ C1＝S1’*C1/S1Taking the example of the finger touching the display panel 100, when the finger touches the display panel 100, a contact area is generated between the finger and the touch electrode, and the capacitance between the finger and the touch electrode, that is, the capacitance variation of the first touch electrode 21 during touching, that is, △ C, can be calculated according to the relationship between the contact area and the area of the touch electrode1＝S1’*C1/S1. For example, in the embodiments illustrated in fig. 3 to 8, if the contact area between the finger and the first touch electrode 21 is half of the area of the first touch electrode 21, the capacitance variation of the first touch electrode 21 is half of the capacitance of the first touch electrode 21, i.e. 0.5V. That is, when the display panel 100 is touched by a finger, the total amount of electricity of the first touch electrode 21 will be changed to C1+△C1＝1.5pf。
Optionally, the area of the second touch electrode 22 is S2In the touch stage, the medium and the second touch electrode are touched22 has a contact area S2' the capacitance variation of the second touch electrode 22 is △ C2Wherein △ C2＝S2’*C2/S2Taking the example of the finger touching the display panel 100, when the finger contacts the display panel 100, a contact area is generated between the finger and the second touch electrode 22, and the capacitance between the finger and the second touch electrode 22, that is, the capacitance variation of the second touch electrode 22 during touching, that is, △ C, can be calculated according to the relationship between the contact area and the area of the second touch electrode 222＝S2’*C2/S2. For example, in the embodiments illustrated in fig. 3-8, if the contact area between the finger and the second touch electrode 22 is half of the area of the second touch electrode 22, the capacitance variation of the second touch electrode 22 is half of the capacitance of the second touch electrode 22, i.e. 0.25 pf. That is, when the display panel 100 is touched by a finger, the total amount of electricity of the second touch electrode 22 will be changed to C1+△C1＝0.75pf。
Taking the embodiment shown in fig. 3 as an example, the total electric quantity Q at the first touch electrode 21 is determined by the touch1m’＝(C1+△C1) 2.5V ═ 1.5pf ═ 2.5V ═ 3.75 coulombs, and the total electric quantity Q from the second touch electrode 222n’＝(C2+△C2) 5V-0.75 pf 5V-3.75 coulombs, and it can be seen that both are equal. In the embodiments shown in fig. 4-8, in the case of a touch, the total amount of electricity at the first touch electrode 21 and the total amount of electricity at the second touch electrode 22 are also equal, which is not listed here.
Optionally, the display area 11 in this application is a shaped area, and a boundary line of the shaped area intersects with the first direction and/or the second direction; the second touch electrode 22 is located at the boundary of the special-shaped area, and the area of the second touch electrode 22 is smaller than that of the first touch electrode 21.
Specifically, since the second touch electrode 22 is located at the boundary of the shaped region, the second touch electrode 22 is cut by the boundary line of the shaped region, so that the area of the second touch electrode 22 in the display area 11 is smaller than the area of the first touch electrode 21. Since the shape of the boundary line of the irregular area is variously possible, the touch electrode at the boundary line of the irregular area may be the first touch electrode 21. The boundary line of the special-shaped area in the application at least comprises an arc line, a straight line or a broken line. When the boundary line of the special-shaped area is an arc line, the display area 11 of the display panel 100 may be designed to be circular, referring to fig. 2, the circular display panel 100 is one of the most popular special-shaped display panels 100 at present, for example, a watch, a smart wearable mobile phone, and the like, the display panel 100 is usually designed to be circular, so as to meet various practical requirements and requirements of customers in terms of appearance. When the boundary line of the shaped area in the present application includes an arc line, the shaped area may be embodied as a circle or an ellipse, but may also be other shapes including an arc line, such as a sector, etc. When the boundary line of the special-shaped area is a straight line or a broken line, the special-shaped area can be designed to be a diamond shape, a hexagon shape or a triangle shape. The present application does not specifically limit the shape of the irregular region in the display panel 100.
When the display panel 100 of the present application is a liquid crystal display panel 100, referring to fig. 9 and 10, fig. 9 is a cross-sectional view of the display panel of the present application, and fig. 10 is a circuit configuration diagram of the display panel of the present application; the liquid crystal display panel 100 includes an array substrate 30 and a color filter substrate 40 which are oppositely disposed, and a liquid crystal layer 50 is disposed between the array substrate 30 and the color filter substrate 40. The array substrate 30 is provided with a plurality of criss-cross gate lines 13 and a plurality of data lines 14, the gate lines 13 and the data lines 14 define a plurality of pixel units 60, each pixel unit 60 is internally provided with a thin film transistor 57 and a pixel electrode 81, a gate 63 of the thin film transistor 57 is electrically connected with the gate line 13, a source 62 is electrically connected with the data line 14, and a drain 61 is electrically connected with the pixel electrode 81; the color film substrate 40 includes a latticed black matrix and a plurality of color resistors arranged in an array in the black matrix opening, where the color resistors include a red color resistor, a green color resistor, and a blue color resistor. The deflection of the liquid crystal molecules is controlled by the electric field between the pixel electrode and the common electrode, thereby achieving the display effect. At this time, the display panel 100 further includes a backlight module, the backlight module is located on one side of the array substrate 30 away from the color film substrate 40, and the backlight module provides light for the display panel 100. .
When the display panel 100 of the present application is an organic light emitting display panel, referring to fig. 11, fig. 11 is another cross-sectional view of the display panel provided in the present application, the organic light emitting display panel 100 includes a flexible substrate 71, a buffer layer 72 disposed on the flexible substrate 71, and a driving functional layer 70 disposed on the buffer layer 72, where the driving functional layer 70 includes a plurality of thin film transistors; the organic light emitting display panel further includes a light emitting function layer 80 disposed on the driving function layer 70 and a thin film encapsulation layer 88 disposed on a surface of the light emitting function layer 80. The light emitting function layer 80 includes an anode layer 82, an organic light emitting material layer 83, and a cathode layer 84, which are sequentially disposed, and the anode layer 82 in the light emitting function layer 80 is electrically connected to the drain electrode 73 of the thin film transistor in the driving function layer 70. After the thin film transistor in the present application is turned on, holes and electrons are injected into the organic light emitting material layer 83 from the anode layer 82 and the cathode layer 84, respectively, under the driving of an applied voltage, and the holes and the electrons meet and recombine in the organic light emitting material layer 83, releasing energy, and then transferring the energy to molecules of an organic light emitting substance in the organic light emitting material, so that the molecules of the organic light emitting substance are transited from a ground state to an excited state. The excited state is unstable, the excited molecules return to the ground state from the excited state, and radiation transition generates a light-emitting phenomenon, so that the display of a picture can be realized by the organic light-emitting diode based on the light-emitting phenomenon.
Based on the same inventive concept, the present application further provides a display device, and fig. 12 is a schematic structural diagram of the display device provided in the present application, the display device 200 includes a display panel 100, where the display panel 100 is the display panel 100 provided in the present application. The display device 200 provided by the present application may be: watch, mobile phone, tablet computer, television, display, notebook computer, digital photo frame, navigator and other products or components with practical functions. In the present application, the embodiment of the display device 200 can refer to the embodiment of the display panel 100, and repeated descriptions are omitted here.
According to the embodiments, the application has the following beneficial effects:
the display panel and the display device provided by the invention comprise a plurality of touch electrodes arranged in an array along a first direction and a second direction, wherein the touch electrodes comprise a plurality of first touch electrodes with equal capacitance values and at least one second touch electrode, and the capacitance value of the second touch electrode is smaller than that of the first touch electrode. Particularly, when no touch is made, the average electric quantity of the first touch electrode with the larger capacitance value is equal to the average electric quantity of the second touch electrode with the smaller capacitance value in the same time, so that the touch quantity sensed by the second touch electrode with the smaller capacitance value is equal to or close to the touch quantity sensed by the first touch electrode with the larger capacitance value during touch, the phenomenon that the touch electrode with the smaller capacitance value cannot detect the touch in the prior art is solved, and the touch performance of the display panel and the display device provided by the application is favorably improved.
The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.
Claims (11)
1. A display panel provided with a display area and a non-display area surrounding the display area, characterized by comprising:
the touch control electrodes are arranged in the display area in an array mode along a first direction and a second direction and comprise a plurality of first touch control electrodes and at least one second touch control electrode, and the capacitance value C of each first touch control electrode1Equal, capacitance value C of the second touch electrode2A capacitance value C smaller than the first touch electrode1；
Touch signal leads electrically connected with the touch electrodes in a one-to-one correspondence manner;
the control chip is electrically connected with the touch signal lead wire and sends a driving voltage signal to each touch electrode through the touch signal lead wire;
when no touch is made, the average electric quantity Q of the first touch electrode is in the same time1Average electric quantity Q of the second touch electrode2Are equal.
2. The display panel according to claim 1, characterized in that: in the same time, the driving voltage signal sent by the control chip to the first touch electrode comprises m pulse signals, and the electric quantity generated by the first touch electrode is Q respectively corresponding to each pulse signal11、Q12、Q13、……Q1mAverage electric quantity Q of the first touch electrode1＝(Q11+Q12+Q13+……+Q1m)/m；
In the same time, the driving voltage signal sent by the control chip to the second touch electrode includes n pulse signals, and the electric quantity generated by the second touch electrode is respectively Q corresponding to each pulse signal21、Q22、Q23、……Q2nAverage electric quantity Q of the second touch electrode2＝(Q21+Q22+Q23+……+Q2n)/n。
3. The display panel according to claim 2, characterized in that: in the same time, the control chip sends a voltage value V of a driving voltage signal to the first touch electrode1A voltage value V smaller than the driving voltage signal sent to the second touch electrode2And C is1*V1＝C2*V2。
4. The display panel according to claim 2, characterized in that: in the same time period, the time period of the two phases,the voltage value V of the driving voltage signal sent by the control chip to the second touch electrode2And a voltage value V of a driving voltage signal sent to the first touch electrode1The frequency f of the driving voltage signal sent by the control chip to the first touch electrode is equal1Less than the frequency f of the driving voltage signal sent to the first touch electrode2，f1/f2＝C2/C1。
5. The display panel according to claim 2, characterized in that: in the same time, the control chip sends a voltage value V of a driving voltage signal to the second touch electrode2And a voltage value V of a driving voltage signal sent to the first touch electrode1The frequency f of the driving voltage signal sent by the control chip to the first touch electrode is equal1Is equal to the frequency f of the driving voltage signal sent to the first touch electrode2；
The display panel further comprises a calibration module, and the calibration module is used for calibrating the first touch electrode according to the capacitance value C of the first touch electrode1And a capacitance value C of the second touch electrode2Acquiring a calibration coefficient A, wherein the calibration module is used for calibrating the electric quantity of the second touch electrode when receiving the nth pulse signal sent by the control chip, so that the electric quantity of the second touch electrode when receiving the nth pulse signal sent by the control chip is Q when no touch occurs2n＝C2*V2A, wherein a is a calibration coefficient.
6. The display panel according to claim 5, wherein: calibration factor a ═ C2/C1，Q2n＝C2*V2*C1/C2＝C1*V2；
When no touch is made, the electric quantity of the first touch electrode when the first touch electrode receives the mth pulse signal sent by the control chip is Q1m＝C1*V1。
7. The display panel according to claim 1, characterized in that: in the touch stage, the average total electric quantity Q of the second touch electrode is in the same time2' average total charge Q with the first touch electrode1' equal.
8. The display panel according to claim 7, wherein: the area of the first touch electrode is S1In the touch stage, the contact area between the touch medium and the first touch electrode is S1' the capacitance variation of the first touch electrode is △ C1Wherein △ C1＝S1’*C1/S1。
9. The display panel according to claim 8, wherein: the area of the second touch electrode is S2In the touch stage, the contact area between the touch medium and the second touch electrode is S2' the capacitance variation of the second touch electrode is △ C2Wherein △ C2＝S2’*C2/S2。
10. The display panel according to claim 1, characterized in that: the display area is a special-shaped area, and a boundary line of the special-shaped area is intersected with the first direction and/or the second direction;
the second touch electrode is located at the boundary of the special-shaped area, and the area of the second touch electrode is smaller than that of the first touch electrode.
11. A display device comprising a display panel, wherein the display panel is the display panel according to any one of claims 1 to 10.
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| CN108388387B (en) * | 2018-01-18 | 2021-08-13 | 深圳市万普拉斯科技有限公司 | Information processing method, information processing device, computer equipment and storage medium |
| CN109064897B (en) * | 2018-08-31 | 2021-08-24 | 厦门天马微电子有限公司 | Display module and display device |
| CN111045549B (en) * | 2019-11-28 | 2023-05-26 | 武汉天马微电子有限公司 | Display panel, driving method thereof and display device |
| CN111427469B (en) * | 2020-02-21 | 2022-11-01 | 厦门天马微电子有限公司 | Display panel and display device |
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| CN106340249A (en) * | 2016-10-18 | 2017-01-18 | 昆山龙腾光电有限公司 | Specially-shaped display panel and pixel structure thereof |
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