CN117572983A - Driving method and device of touch display panel and display device - Google Patents

Driving method and device of touch display panel and display device Download PDF

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Publication number
CN117572983A
CN117572983A CN202311818115.7A CN202311818115A CN117572983A CN 117572983 A CN117572983 A CN 117572983A CN 202311818115 A CN202311818115 A CN 202311818115A CN 117572983 A CN117572983 A CN 117572983A
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Prior art keywords
touch
period
voltage
display panel
switched
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李斌斌
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Guangzhou China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Guangzhou China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Priority to CN202311818115.7A priority Critical patent/CN117572983A/en
Publication of CN117572983A publication Critical patent/CN117572983A/en
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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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Computer Hardware Design (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal (AREA)

Abstract

The application discloses a driving method and device of a touch display panel and display equipment. The scanning period of the touch display panel comprises a display period and a touch period which are alternately arranged, the touch period comprises a touch period and a first coupling period positioned after the touch period, and the method comprises the steps of controlling the output voltage of the source driver to be switched to a reference voltage and controlling the output voltage of the gate driver to be switched to a low level in response to confirming that the touch display panel is switched from the touch period to the first coupling period; after the touch display panel enters a first duration of a first coupling period, controlling the output voltage of the source driver to be switched to a first voltage, wherein the first voltage is a display driving voltage output by the source driver in a display stage before the touch stage; the output voltage of the control gate driver is switched to a high level after the second period. The VCOM voltage can be ensured to be stable after the VCOM voltage is discharged from the pit, the phenomenon of transverse lines is avoided, and the display effect is greatly improved.

Description

Driving method and device of touch display panel and display device
Technical Field
The application relates to the technical field of display, in particular to a driving method and device of a touch display panel and display equipment.
Background
Since parasitic capacitance exists on the TFT (ThinFilm Transistor ) display panel, the VCOM voltage (common electrode voltage) is easily coupled with the Data signal (Data signal) and the gate signal (scan signal) at the time of display, thereby generating fluctuation, and further causing display abnormality.
In order to improve abnormal display, a VCOM OP circuit (VCOM voltage compensation circuit) is usually disposed on the driving device of the TFT display panel to reduce the influence of coupling on the VCOM voltage, so that the VCOM voltage can be quickly recovered to the normal voltage.
However, in an excel TFT display panel (a TFT display panel with embedded integrated touch technology), because VCOM (common electrode) is divided into a plurality of sensors, and VCOM needs to perform a modulation action in a touch stage, a VCOM OP circuit cannot be used on the excel TFT display panel, so that when switching between a display stage and a touch stage, VCOM voltage is easy to be coupled by Data signals to generate fluctuation and cannot be recovered quickly, further a visual phenomenon similar to a cross stripe appears on a display screen, and a display effect is reduced.
Disclosure of Invention
The embodiment of the application provides a driving method and device of a touch display panel and display equipment, so as to solve the problem that a display picture of the touch display panel is easy to generate a cross grain phenomenon when switching between a display stage and a touch stage.
In order to solve the technical problems, the embodiment of the application discloses the following technical scheme:
in a first aspect, a driving method of a touch display panel is provided, wherein a scanning period of the touch display panel includes a display stage and a touch stage which are alternately arranged, and the touch stage includes a touch period and a first coupling period located after the touch period; the driving method includes:
in response to confirming that the touch display panel is switched from the touch period to the first coupling period, controlling the output voltage of the source driver to be switched to a reference voltage and controlling the output voltage of the gate driver to be switched to a first level;
a first duration T when the touch display panel enters the first coupling period 1 Then, the output voltage of the source driver is controlled to be switched from the reference voltage to a first voltage, wherein the first voltage is a display driving voltage output by the source driver in a display stage before the touch stage;
at the saidThe output voltage of the source driver is switched to the second time period T of the first voltage 2 And then, controlling the output voltage of the gate driver to be switched from the first level to a second level.
With reference to the first aspect, the driving method further includes:
at the second time period T 2 Then, controlling the output voltage of the source driver to switch from the first voltage to a second voltage, wherein the second voltage is a display driving voltage output by the source driver in a display stage after the touch stage;
a third period of time T when the output voltage of the source driver is switched to the second voltage 3 And then, controlling the touch display panel to switch from the first coupling period to the next display period after the touch period.
With reference to the first aspect, the display stage has a line scan duration T L ；
The second time period T 2 And the line scanning time length T L The method meets the following conditions: t (T) 2 ＝M×T L M is a positive integer.
With reference to the first aspect, the M satisfies: m is more than or equal to 3 and less than or equal to 6.
With reference to the first aspect, the touch stage further includes a second coupling period located before the touch period; the driving method further includes:
controlling an output voltage of the source driver to maintain the first voltage in response to confirming that the touch display panel is switched from the display stage to the second coupling period;
a fourth time length T when the touch display panel enters the second coupling period 4 And then, controlling the output voltage of the source driver to be switched from the first voltage to the reference voltage.
With reference to the first aspect, the display stage has a line scan duration T L ；
The fourth time period T 4 And the line scanning time length T L The method meets the following conditions: t (T) 4 ＝N×T L N is a positive integer.
With reference to the first aspect, the N satisfies: n is more than 0 and less than or equal to 6.
With reference to the first aspect, the driving method further includes:
a fifth period of time T when the output voltage of the source driver is switched to the reference voltage 5 And then, controlling the touch display panel to switch from the second coupling period to the touch period.
In a second aspect, a driving device for a touch display panel is provided, where a scanning period of the touch display panel includes a display stage and a touch stage that are alternately arranged, and the touch stage includes a touch period and a first coupling period located after the touch period; the driving device includes:
a driving control chip for controlling the output voltage of the source driver to be switched to the reference voltage and controlling the output voltage of the gate driver to be switched to the first level in response to confirming that the touch display panel is switched from the touch period to the first coupling period; and, at a first time period T when the touch display panel enters the first coupling period 1 Then, the output voltage of the source driver is controlled to be switched from the reference voltage to a first voltage, wherein the first voltage is a display driving voltage output by the source driver in a display stage before the touch stage;
and a second period T for switching the output voltage of the source driver to the first voltage 2 And then, controlling the output voltage of the gate driver to be switched from the first level to a second level.
In a third aspect, a display device is provided, including a touch display panel and a driving apparatus, where the driving apparatus drives the touch display panel to perform picture display by using the driving method of the touch display panel according to any one of the first aspects.
One of the above technical solutions has the following advantages or beneficial effects:
compared with the prior art, the method for driving the touch display panel comprises the steps that a scanning period of the touch display panel comprises display phases and touch phases which are alternately arranged, wherein the touch phases comprise touch periods and first coupling periods positioned behind the touch periods, the method comprises the steps of controlling output voltage of a source driver to be switched to reference voltage and controlling output voltage of a grid driver to be switched to a first level in response to confirming that the touch display panel is switched from the touch periods to the first coupling periods; after the touch display panel enters a first duration of a first coupling period, controlling the output voltage of the source driver to be switched from a reference voltage to a first voltage, wherein the first voltage is a display driving voltage output by the source driver in a display stage before the touch stage; after a second period of time, the output voltage of the control gate driver is switched from the first level to the second level. According to the driving method of the touch display panel, before the next display stage is started from the touch stage, the output voltage of the source driver is switched to the first voltage in advance in the first coupling period, so that the state of the source driver after pit discharging (the display stage is started from the touch stage) is identical to that before pit discharging, fluctuation of VCOM voltage can be completed before the output voltage of the gate driver is switched to the second level, VCOM voltage can be kept stable after pit discharging, cross-grain phenomenon is avoided, and display effect is greatly improved.
The driving device of the touch display panel can ensure that VCOM voltage can be kept stable after pit discharge in the driving process, cross grain phenomenon is avoided, and display effect is greatly improved.
The touch display panel provided by the application can not generate a transverse stripe phenomenon due to the fact that VCOM is coupled in the process of continuously switching between the display stage and the touch stage, and has an excellent display effect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a scan mode of a display device according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a conventional driving timing diagram of a touch display panel;
fig. 4 is an overall flow chart of a driving method of a touch display panel according to an embodiment of the disclosure;
fig. 5 is a schematic diagram of a driving timing sequence of a touch display panel according to an embodiment of the disclosure;
FIG. 6 is a timing diagram of the output voltage of the source driver according to the embodiment of the present application;
fig. 7 is a schematic structural diagram of a driving device of a touch display panel according to an embodiment of the disclosure.
Reference numerals:
10-a touch display panel; 20-driving means; 21-a drive control chip; 22-source drivers; 23-gate driver.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate an orientation or a positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality" is two or more, and at least one means may be one, two or more, unless explicitly defined otherwise.
In the present application, "entering a pit" refers to entering a touch stage from a display stage, and "exiting a pit" refers to entering a display stage from a touch stage.
Referring to fig. 1, fig. 1 illustrates a structure of a display device according to an embodiment of the present application. The display device provided in the embodiment of the present application includes a touch display panel 10 and a driving device 20, where the touch display panel 10 may be an excel TFT display panel. The driving device 20 may include a driving control chip 21, a Source Driver (Source Driver) 22, and a Gate Driver (Gate Driver) 23, where the driving control chip 21 is used to drive the touch display panel 10 to display a picture. Specifically, the scanning period of the touch display panel 10 includes a display stage and a touch stage that are alternately arranged, in the display stage, the driving control chip 21 may control the source driver 22 and the gate driver 23 to output corresponding driving signals so that the touch display panel 10 displays corresponding images, and in the touch stage, the driving control chip 21 may process touch report information triggered by a user on the touch display panel 10. In this embodiment, the driving device 20 may be configured to provide the display driving signal to the touch display panel 10 in the display stage, and provide the touch driving signal to the touch display panel 10 in the touch stage.
In this embodiment of the present application, the display device may be a mobile phone, or may be a notebook computer, a desktop computer, a television, an intelligent wearable device, etc., and the specific form of the display device is not limited in this embodiment.
Since parasitic capacitance exists on the TFT (ThinFilm Transistor ) display panel, the VCOM voltage (common electrode voltage) is easily coupled with the Data signal (Data signal) and the gate signal (scan signal) at the time of display, thereby generating fluctuation, and further causing display abnormality. The conventional TFT display panel driving device is generally provided with a VCOM OP circuit, which can reduce the influence of coupling on the VCOM voltage, improve the stability of the VCOM voltage, and improve the display abnormality caused by VCOM voltage fluctuation. However, in the touch display panel 10, a plurality of sensing sensor blocks (sensor modules) are designed on the glass, and parasitic capacitances exist between the sensor blocks, so that the sensitivity of touch is affected, and thus a waveform of modulation, i.e. a periodic modulated voltage square wave signal, is required to be applied to eliminate the interference of the coupling capacitance. Since VCOM (common electrode) is divided into a plurality of sensors, and the VCOM needs to perform a modulation action (modulation) in the touch stage, the VCOM OP circuit cannot be used in the display device of the embodiment of the application.
Referring to fig. 2, fig. 2 illustrates a scan mode of the display device in an embodiment of the present application. When the display device of the embodiment of the application is used in combination with a writing device (for example, an active pen), due to the specific requirements of the protocol of the active pen and the high precision problem, a time division multiplexing Mode (Long H Mode) is needed, namely, the touch time of each frame is divided into a plurality of blocks to be inserted into the display time of the frame, and compared with the conventional Mode (Normal), the touch time of each frame is completely located in a Blank interval after the display time of each frame, so that the touch sensitivity can be greatly improved.
It can be understood that in the Long H mode, the stability requirement on VCOM is high, and if VCOM is unstable, the phenomenon of cross-talk is more likely to occur, especially when pit in and pit out, the output voltage of the source driver 22 is more variable at this time, so that the VCOM is more likely to be coupled.
Referring to fig. 3, fig. 3 illustrates a conventional driving timing of a touch display panel. The typical scan cycle of the touch display panel 10 generally includes alternating display phases and touch phases. When the touch display panel 10 enters the touch stage from the display stage, the output voltage of the Source driver 22 (the output voltage of the Source driver 22 is shown as Source for convenience of illustration) will drop to the reference voltage V 0 The source driver 22 can couple VCOM voltage, which is subject to fluctuation due to Data signal coupling and cannot be recovered quickly, and the gate driver 23 (for convenience of illustrationThe output voltage of the Gate driver 23 is denoted by Gate) may not be completely turned off, and thus a cross-talk phenomenon may occur when pit entry occurs. When the touch display panel 10 enters the display stage from the touch stage, the output voltage of the source driver 22 is equal to the reference voltage V 0 The source driver 22 will couple to the VCOM voltage, which is subject to fluctuation due to Data signal coupling and cannot be recovered quickly, and the gate driver 23 is turned on, so that the cross-talk phenomenon is generated during pit-out. Therefore, the conventional driving timing of the driving control chip 21 may cause the display screen of the touch display panel 10 to have a visual phenomenon similar to the cross stripe, and reduce the display effect.
In view of this, the embodiments of the present application provide a driving method of a touch display panel, which optimizes the timing sequence of the output voltage of the source driver 22 when switching between the display stage and the touch stage, so as to avoid the influence of the VCOM voltage fluctuation in the display stage, ensure that the VCOM voltage can be kept stable after leaving the pit, and avoid the occurrence of the cross-stripe phenomenon, so as to solve at least part of the above technical problems.
Referring to fig. 4, fig. 4 illustrates an overall flow of a driving method of a touch display panel according to an embodiment of the present application. The driving method of the touch display panel is applied to the driving control chip 21, and specifically comprises the following steps:
step 401: in response to confirmation of the touch display panel 10 from the touch period S 0 Switching to the first coupling period S 1 Control the output voltage of the source driver 22 to switch to the reference voltage V 0 And the output voltage of the control gate driver 23 is switched to the first level VGL.
Referring to fig. 5, fig. 5 illustrates a driving timing sequence of the touch display panel according to the embodiment of the application. In this embodiment, the Touch stage Touch may include a Touch period S 0 And is positioned in the touch control period S 0 The following first coupling period S 1 . In the touch control period S 0 The source driver 22 is not outputting a data signal, that is, the source driver 22 is not outputting a display driving voltage, and the gate driver 23 is also in an off stateVCOM is in the Touch operation state, i.e. divided into a plurality of sensors to sense the voltage variation at each position of the screen. In the first coupling period S 1 In this case, the output voltage of the source driver 22 is switched from the non-display driving voltage state to the reference voltage V 0 VCOM is switched to the reference voltage V at the output voltage of the source driver 22 0 Then, the display stage is switched to an operating state, i.e., a common voltage, so as to form a voltage for driving the liquid crystal to turn over together with the output voltage of the source driver 22. After confirming the touch display panel 10 is in the touch period S 0 Switching to the first coupling period S 1 When the output voltage (i.e., source) of the Source driver 22 is controlled to be switched to the reference voltage V 0 At the same time, the output voltage (i.e., gate) of the control Gate driver 23 is switched to the first level VGL, which is a low level.
In some examples, reference voltage V 0 May be 0V (volts).
Step 402: after the touch display panel 10 enters the first coupling period S 1 Is of a first duration T 1 Thereafter, the output voltage of the source driver 22 is controlled from the reference voltage V 0 Switch to the first voltage V 1 First voltage V 1 The Display driving voltage outputted from the source driver 22 in the Display stage before the Touch stage Touch.
It will be appreciated that the first voltage V 1 The display driving voltage output from the source driver 22 before pit entry is related to the specific display screen before pit entry and the specific display data of the current line being scanned.
Step 403: at the output voltage of the source driver 22, the first voltage V is switched 1 Is of a second duration T 2 Thereafter, the output voltage of the control gate driver 23 is switched from the first level VGL to the second level VGH.
Wherein the second level VGH is a high level.
Specifically, a certain period of time may be reserved for the timing control before pit exit, so as to adjust the output voltage of the source driver 22. Second duration T 2 The size of (a) should be determined according to the coupling recovery time.
In some examples, the Display phase Display has a row scan duration T L . Line scan duration T L In relation to the resolution of the touch display panel 10, the resolution of the display panel, for example, 60Hz refresh rate, is 2070 x 1230,1 rows of row scan duration T L =1/60/1230×1000000=13.55 us (microseconds). Second duration T 2 And a line scanning time length T L The method can satisfy the following conditions: t (T) 2 ＝M×T L M is a positive integer.
Illustratively, M has a value of 3 to 6. In some examples, M is a range value of any one or both of 3, 4, 5, 6.
In other examples, the second time period T 2 Other durations may be set, for example, a non-integer multiple of the line scanning duration, and may be adjusted according to the actual display condition of the display device, which is not limited specifically.
It will be appreciated that before the gate driver 23 is turned on, the output voltage of the source driver 22 is pulled up to be consistent with the state before pit entry, so that the couple of the Data signal to VCOM can be stabilized after pit exit, and therefore no display cross-stripes appear.
In some embodiments, the driving method of the touch display panel provided in the embodiments of the present application may further include the following steps:
step one, in a second time period T 2 Thereafter, the output voltage of the source driver 22 is controlled from the first voltage V 1 Switch to the second voltage V 2 Second voltage V 2 The Display driving voltage is outputted from the source driver 22 in the Display stage after Touch.
It will be appreciated that the second voltage V 2 With a first voltage V 1 May be equal or unequal.
Step two, the output voltage of the source driver 22 is switched to the second voltage V 2 Is of a third duration T 3 After that, the touch display panel 10 is controlled from the first coupling period S 1 Switching to the Display stage next to the Touch stage.
Specifically, a first time lengthT 1 A second time length T 2 And a third time period T 3 The sum of (a) is the first coupling period S 1 Is a time period of (2).
With continued reference to fig. 5, in some embodiments, the Touch stage Touch of the embodiments of the present application may further include a Touch period S 0 A preceding second coupling period S 2 . In the second coupling period S 2 The output voltage of the source driver 22 is first from the first voltage V 1 Switching to reference voltage V 0 At the same time, the output voltage of the gate driver 23 needs to be switched to the first level VGL.
The driving method of the touch display panel may further include the steps of:
step one, in response to confirmation of the touch Display panel 10 switching from the Display stage Display to the second coupling period S 2 The output voltage of the source driver 22 is controlled to maintain the first voltage V 1 。
Step two, after the touch display panel 10 enters the second coupling period S 2 Is a fourth period of time T 4 Thereafter, the output voltage of the source driver 22 is controlled from the first voltage V 1 Is switched to the reference voltage V 0 。
In some examples, the fourth time period T 4 And a line scanning time length T L The method can satisfy the following conditions: t (T) 4 ＝N×T L N is a positive integer.
Illustratively, N has a value of 1 to 6. In some examples, N is a range value of any one or both of 1, 2, 3, 4, 5, 6.
Referring to fig. 6, fig. 6 illustrates an example of the timing of the output voltage of the source driver in the embodiment of the present application. In some examples, taking m=n as an example, the waveform of the source driver 22 maintaining the first voltage may be implemented by a Repeat action, and when the Repeat action (No Repeat) is not performed, the waveform of the output voltage of the source driver 22 is referred to as a waveform a 0 When Repeat for one row scanning period (Repeat 1H), the waveform of the output voltage of the source driver 22 is referred to as waveform a 1 When Repeat two line scan periods (Repeat 2H), the output voltage waveform of the source driver 22 is referred to as waveform a 2 When Repeat n line scan durations (Repeat nH), the output voltage waveform of the source driver 22 is referred to as waveform a n . It will be appreciated that both M and N may be adjusted according to actual requirements. Thus, by the above Repeat operation, it is possible to ensure that the Data waveform outputted from the source driver 22 can be repeatedly put in and out of the state before pit.
In other examples, the fourth time length T 4 Other durations may be provided, for example, a non-integer multiple of the line scan duration, which may be adjusted according to the actual display condition of the display device, or a fourth duration T 4 May also be set to zero, i.e. upon confirmation of the touch Display panel 10 switching from the Display phase Display to the second coupling period S 2 Then, the output voltage of the source driver 22 can be directly controlled from the first voltage V 1 Is switched to the reference voltage V 0 This is not particularly limited.
Step three, switching the output voltage of the source driver 22 to the reference voltage V 0 Is a fifth time period T of (2) 5 After that, the touch display panel 10 is controlled from the second coupling period S 2 Switch to touch time S 0 。
Specifically, the fifth time period T 5 The size of (a) should be determined according to the coupling recovery time. Fourth duration T 4 And a fifth time period T 5 The sum of (a) is the second coupling period S 2 Is a time period of (2).
By the above way, the second coupling period S from the Display stage to the Touch stage 2 The Data waveform is maintained for N rows of time and then enters a modulation state, i.e. is switched to the reference voltage V 0 It is ensured that the signal output from the source driver 22 delays the turn-on of VCOM and that the gate driver 23 has enough time to turn off; first coupling period S from Touch stage Touch 1 When the next Display stage is started and the Data waveform starts M rows of time, the couple of the Data waveform to VCOM can be stabilized after the VCOM is out of the pit, so that transverse lines can not be displayed before and after the pit.
It can be appreciated that, by adopting the new time sequence to drive the touch display panel, the method can optimize the problem of TP pit transverse lines of the industry in cell projects, avoid abnormal display conditions, improve the quality of images and the use experience of terminal consumers.
Accordingly, referring to fig. 7, fig. 7 illustrates a structure of a driving device of a touch display panel according to an embodiment of the present application. The driving device 20 of the touch display panel provided in the embodiment of the present application includes a driving control chip 21, a source driver 22 and a gate driver 23.
The driving control chip 21 is configured to control the output voltage of the source driver 22 to be switched to the reference voltage and the output voltage of the gate driver 23 to be switched to the first level in response to confirming that the touch display panel 10 is switched from the touch period to the first coupling period. And, at a first time period T when the touch display panel 10 enters the first coupling period 1 Then, the output voltage of the source driver 22 is controlled to switch from the reference voltage to a first voltage, which is the display driving voltage outputted by the source driver 22 in the display stage preceding the touch stage.
The driving control chip 21 is also used for switching the output voltage of the source driver 22 to the first voltage for a second period of time T 2 Thereafter, the output voltage of the control gate driver 23 is switched from the first level to the second level.
In some embodiments, the drive control chip 21 is further configured to:
during a second period of time T 2 Then, the output voltage of the source driver 22 is controlled to switch from the first voltage to the second voltage, wherein the second voltage is the display driving voltage outputted by the source driver 22 in the display stage after the touch stage.
A third period of time T when the output voltage of the source driver 22 is switched to the second voltage 3 Then, the touch display panel 10 is controlled to switch from the first coupling period to the next display period after the touch period.
In some embodiments, the display phase has a line scan duration T L 。
Second duration T 2 And a line scanning time length T L The method meets the following conditions: t (T) 2 ＝M×T L M is a positive integer.
In some embodiments, M satisfies: m is more than or equal to 3 and less than or equal to 6.
In some embodiments, the touch stage further includes a second coupling period located before the touch period. The drive control chip 21 is further configured to:
in response to confirming that the touch display panel 10 is switched from the display stage to the second coupling period, the output voltage of the source driver 22 is controlled to maintain the first voltage.
A fourth time period T when the touch display panel 10 enters the second coupling period 4 Thereafter, the output voltage of the source driver 22 is controlled to be switched from the first voltage to the reference voltage.
In some embodiments, the display phase has a line scan duration T L 。
Fourth duration T 4 And a line scanning time length T L The method meets the following conditions: t (T) 4 ＝N×T L N is a positive integer.
In some embodiments, N satisfies: n is more than 0 and less than or equal to 6.
In some embodiments, the drive control chip 21 is further configured to:
a fifth period of time T when the output voltage of the source driver 22 is switched to the reference voltage 5 After that, the touch display panel 10 is controlled to switch from the second coupling period to the touch period.
It can be appreciated that, the driving device of the touch display panel in the embodiment of the application can ensure that the VCOM voltage can be kept stable after the VCOM voltage is discharged from the pit in the driving process, so as to avoid the occurrence of the transverse stripe phenomenon and greatly improve the display effect.
Accordingly, in the display device of the embodiment of the application, the transverse stripe phenomenon can not occur due to the coupling effect of the VCOM in the process of continuously switching the display stage and the touch stage, and the display device has an excellent display effect.
It should be noted that, the above embodiments of the method and apparatus for driving a touch display panel and the display device may refer to each other, and for features not specifically described in a certain embodiment, refer to related content in other embodiments.
The foregoing describes in detail a driving method, apparatus and display device of a touch display panel provided in the embodiments of the present application, and specific examples are applied to describe the principles and implementations of the present application, where the descriptions of the foregoing embodiments are only used to help understand the technical solutions and core ideas of the present application; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. The driving method of the touch display panel is characterized in that a scanning period of the touch display panel comprises display phases and touch phases which are alternately arranged, and the touch phases comprise a touch time period and a first coupling time period positioned after the touch time period; the driving method includes:
in response to confirming that the touch display panel is switched from the touch period to the first coupling period, controlling the output voltage of the source driver to be switched to a reference voltage and controlling the output voltage of the gate driver to be switched to a first level;
a first duration T when the touch display panel enters the first coupling period 1 Then, the output voltage of the source driver is controlled to be switched from the reference voltage to a first voltage, wherein the first voltage is a display driving voltage output by the source driver in a display stage before the touch stage;
a second period of time T when the output voltage of the source driver is switched to the first voltage 2 And then, controlling the output voltage of the gate driver to be switched from the first level to a second level.
2. The driving method of a touch display panel according to claim 1, further comprising:
at the second time period T 2 Then, the output voltage of the source driver is controlled to switch from the first voltage to the second voltageThe second voltage is a display driving voltage output by the source driver in a display stage after the touch stage;
a third period of time T when the output voltage of the source driver is switched to the second voltage 3 And then, controlling the touch display panel to switch from the first coupling period to the next display period after the touch period.
3. The method according to claim 1 or 2, wherein the display phase has a line scanning duration T L ；
The second time period T 2 And the line scanning time length T L The method meets the following conditions: t (T) 2 ＝M×T L M is a positive integer.
4. The driving method of a touch display panel according to claim 3, wherein M satisfies: m is more than or equal to 3 and less than or equal to 6.
5. The method according to claim 1, wherein the touch stage further includes a second coupling period before the touch period; the driving method further includes:
controlling an output voltage of the source driver to maintain the first voltage in response to confirming that the touch display panel is switched from the display stage to the second coupling period;
a fourth time length T when the touch display panel enters the second coupling period 4 And then, controlling the output voltage of the source driver to be switched from the first voltage to the reference voltage.
6. The method according to claim 5, wherein the display stage has a row scanning duration T L ；
The fourth time period T 4 And the line scanning time length T L The method meets the following conditions: t (T) 4 ＝N×T L N isA positive integer.
7. The method of driving a touch display panel according to claim 6, wherein N satisfies: n is more than 0 and less than or equal to 6.
8. The driving method of a touch display panel according to claim 5, further comprising:
a fifth period of time T when the output voltage of the source driver is switched to the reference voltage 5 And then, controlling the touch display panel to switch from the second coupling period to the touch period.
9. The driving device of the touch display panel is characterized in that a scanning period of the touch display panel comprises display phases and touch phases which are alternately arranged, and the touch phases comprise a touch time period and a first coupling time period positioned after the touch time period; the driving device includes:
a driving control chip for controlling the output voltage of the source driver to be switched to the reference voltage and controlling the output voltage of the gate driver to be switched to the first level in response to confirming that the touch display panel is switched from the touch period to the first coupling period; and, at a first time period T when the touch display panel enters the first coupling period 1 Then, the output voltage of the source driver is controlled to be switched from the reference voltage to a first voltage, wherein the first voltage is a display driving voltage output by the source driver in a display stage before the touch stage;
and a second period T for switching the output voltage of the source driver to the first voltage 2 And then, controlling the output voltage of the gate driver to be switched from the first level to a second level.
10. A display device, comprising a touch display panel and a driving device, wherein the driving device drives the touch display panel to display a picture by adopting the driving method of the touch display panel according to any one of claims 1 to 8.
CN202311818115.7A 2023-12-26 2023-12-26 Driving method and device of touch display panel and display device Pending CN117572983A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311818115.7A CN117572983A (en) 2023-12-26 2023-12-26 Driving method and device of touch display panel and display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311818115.7A CN117572983A (en) 2023-12-26 2023-12-26 Driving method and device of touch display panel and display device

Publications (1)

Publication Number Publication Date
CN117572983A true CN117572983A (en) 2024-02-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311818115.7A Pending CN117572983A (en) 2023-12-26 2023-12-26 Driving method and device of touch display panel and display device

Country Status (1)

Country Link
CN (1) CN117572983A (en)

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