CN107358930B - Embedded touch screen, driving method thereof and display device - Google Patents
Embedded touch screen, driving method thereof and display device Download PDFInfo
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- CN107358930B CN107358930B CN201710772195.5A CN201710772195A CN107358930B CN 107358930 B CN107358930 B CN 107358930B CN 201710772195 A CN201710772195 A CN 201710772195A CN 107358930 B CN107358930 B CN 107358930B
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- 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
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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
Abstract
The invention discloses an embedded touch screen, a driving method thereof and a display device.A first switch transistor is controlled to be turned on by a touch starting signal line in a touch time period so that a touch scanning signal output by a driving chip is transmitted to the touch scanning signal line through a grid signal line or a data signal line to realize a touch function; in the display time period, the first switch transistor is controlled to be turned off through the touch control starting signal line, so that the grid scanning signal or the gray scale signal output by the driving chip is transmitted on the grid signal line or the data signal line to realize the display function. In the embodiment of the invention, the grid signal line or the data signal line can transmit the touch scanning signal and the display signal in a time-sharing manner only by adding the first switch transistor and the touch starting signal line, so that the wiring number of the fan-out area is greatly reduced, the number of pins corresponding to the wiring of the fan-out area is also greatly reduced, the quality of the embedded touch screen is improved, and the manufacturing cost is reduced.
Description
Technical Field
The invention relates to the technical field of display, in particular to an embedded touch screen, a driving method thereof and a display device.
Background
with the rapid development of Display technologies, Touch screens (Touch Screen panels) are gradually spreading throughout the lives of people, and Touch screens are classified into an Add On Mode Touch Panel (Add On Touch Panel), an On Cell Touch Panel (On Cell Touch Panel), and an In Cell Touch Panel (In Cell Touch Panel) according to their composition structures.
Currently, an existing embedded Touch screen implements a Touch function and a Display function by dividing the time of each frame (V-sync) into a Display time period (Display) and a Touch time period (Touch) in a time-sharing driving manner. Specifically, as shown in fig. 1, in a Display period (Display), the Gate driving chip sequentially applies a Gate scanning signal to each of the Gate signal lines Gate1, Gate2, … …, Gate n-1, and Gate n in the embedded touch screen, and the source driving chip applies a gray scale signal to the Data signal lines Data to realize a Display function; in a Touch time period (Touch), the Touch detection chip applies a driving signal to the Touch scanning signal line Tx, receives a capacitance variation signal of the Touch electrode fed back by the Touch scanning signal line Tx, and determines whether Touch occurs by analyzing the feedback signal, so as to implement a Touch function.
As can be seen from the above description, in the conventional embedded touch screen, the touch signal and the display signal are processed separately, and in the prior art, the source driver chip and the touch detector chip or the gate driver chip and the touch detector chip are generally integrated on a driver chip, and signal output pins (Pin) including data signal lines and touch scan signal lines or gate signal lines and touch scan signal lines are disposed on the driver chip, so that the number of pins is greatly increased compared to that of the non-touch display screen, which results in a higher manufacturing cost. In addition, for example, the source driver chip and the touch sensing chip are integrated on a driver chip, because the driver chip implements signal loading on the pixel electrode through the data signal line of the fan-out area and implements signal loading on the touch electrode through the touch scanning signal line of the fan-out area, compared with a non-touch display screen, the number of wires in the fan-out area of the embedded touch screen is greatly increased, which further causes the light transmittance of the fan-out area to be reduced, the ultraviolet curing effect of the frame sealing glue is poor, and the quality of the embedded touch screen is affected.
Disclosure of Invention
In view of the above, embodiments of the present invention provide an in-cell touch panel, a driving method thereof and a display device, so as to reduce the manufacturing cost of the in-cell touch panel and improve the quality of the in-cell touch panel.
Therefore, an in-cell touch screen provided by an embodiment of the present invention includes: the display device comprises a display area provided with a grid signal line, a data signal line and a touch scanning signal line, and a non-display area provided with a fan-out area and a driving circuit area, wherein the grid signal line or the data signal line extends to the fan-out area, and the driving circuit area comprises a driving chip; further comprising: the touch control circuit comprises a first switching transistor and a touch control starting signal line; wherein the content of the first and second substances,
The grid electrode of the first switch transistor is connected with the touch control starting signal line, the source electrode of the first switch transistor is connected with the grid signal line or the data signal line, and the drain electrode of the first switch transistor is connected with the touch control scanning signal line;
In a touch time period, the touch starting signal line controls the first switch transistor to be started so that a touch scanning signal output by the driving chip is transmitted to the touch scanning signal line through the grid signal line or the data signal line;
In a display time period, the touch-control starting signal line controls the first switch transistor to be closed so that a grid scanning signal or a gray scale signal output by the driving chip is transmitted on the grid signal line or the data signal line.
In a possible implementation manner, in the in-cell touch screen provided in the embodiment of the present invention, the in-cell touch screen further includes: a flexible circuit board bound on the embedded touch screen;
The flexible circuit board is used for loading an electric signal for controlling the first switching transistor to be switched on or switched off to the touch control starting signal line.
In a possible implementation manner, in the in-cell touch screen provided in the embodiment of the present invention, the in-cell touch screen further includes: and the self-capacitance electrode is connected with the touch scanning signal line and is multiplexed as a common electrode.
In a possible implementation manner, in the in-cell touch screen provided in the embodiment of the present invention, the in-cell touch screen further includes: and the touch driving electrode is connected with the touch scanning signal line and is reused as a common electrode.
In a possible implementation manner, in the in-cell touch screen provided in the embodiment of the present invention, the in-cell touch screen further includes: the second switch transistor, the touch closing signal line and the common electrode signal line; wherein the content of the first and second substances,
The grid electrode of the second switch transistor is connected with the touch closing signal line, the drain electrode of the second switch transistor is connected with the touch scanning signal line, and the source electrode of the second switch transistor is connected with the common electrode signal line;
In a touch time period, the touch closing signal line controls the second switch transistor to be closed so that a touch scanning signal output by the driving chip is transmitted to the touch scanning signal line through the grid signal line or the data signal line;
In a display time period, the touch closing signal line controls the second switching transistor to be turned on, so that the common electrode signal output by the common electrode signal line is transmitted on the touch scanning signal line.
In a possible implementation manner, in the in-cell touch screen provided in the embodiment of the present invention, the flexible circuit board is further configured to load an electrical signal for controlling the second switch transistor to be turned on or off to the touch-off signal line.
In a possible implementation manner, in the in-cell touch screen provided in the embodiment of the present invention, the first switch transistor, the second switch transistor, the touch-on signal line, the touch-off signal line, and the common electrode signal line are all located between the display area and the fan-out area; alternatively, the first and second electrodes may be,
The first switch transistor, the second switch transistor, the touch-control opening signal line, the touch-control closing signal line and the common electrode signal line are all located in the non-display area on one side, far away from the fan-out area, of the display area.
The embodiment of the invention also provides a display device which comprises the embedded touch screen.
The embodiment of the invention also provides a driving method of the embedded touch screen, which comprises the following steps:
In a touch time period, the first switching transistor is controlled to be turned on through the touch starting signal line, so that the grid signal line or the data signal line transmits a touch scanning signal output by the driving chip to the touch scanning signal line;
And in a display time period, controlling the first switch transistor to be closed through the touch control starting signal line so that the grid signal line or the data signal line transmits a grid scanning signal or a gray scale signal output by the driving chip.
In a possible implementation manner, in the driving method provided in an embodiment of the present invention, the method further includes:
In a touch time period, controlling the second switch transistor to be closed through a touch closing signal line so that the grid signal line or the data signal line transmits a touch scanning signal output by the driving chip to the touch scanning signal line;
And in a display time period, the second switch transistor is controlled to be turned on through the touch closing signal line, so that the common electrode signal output by the common electrode signal line is transmitted to the touch scanning signal line.
The invention has the following beneficial effects:
In the embedded touch screen, the driving method thereof and the display device provided by the embodiment of the invention, the first switch transistor is controlled to be turned on by the touch start signal line in the touch time period, so that the touch scanning signal output by the driving chip is transmitted to the touch scanning signal line through the grid signal line or the data signal line to realize the touch function; in the display time period, the first switch transistor is controlled to be turned off through the touch control starting signal line, so that the grid scanning signal or the gray scale signal output by the driving chip is transmitted on the grid signal line or the data signal line to realize the display function. In the embodiment of the invention, the grid signal line or the data signal line can transmit the touch scanning signal and the display signal in a time-sharing manner only by adding the first switch transistor and the touch starting signal line so as to realize the touch function and the display function, so that the wiring number of the fan-out area is greatly reduced, the number of pins corresponding to the wiring of the fan-out area is also greatly reduced, the quality of the embedded touch screen is improved, and the manufacturing cost is reduced.
Drawings
FIG. 1 is a schematic diagram of a driving timing sequence of an in-cell touch screen in the prior art;
FIG. 2 is a schematic diagram of an in-cell touch screen according to an embodiment of the invention;
FIG. 3 is a second schematic view illustrating an in-cell touch screen according to an embodiment of the invention;
Fig. 4a and fig. 4b are schematic diagrams of a driving method according to an embodiment of the present invention;
Fig. 5 is a schematic diagram of a driving timing sequence according to an embodiment of the invention.
Detailed Description
The following describes in detail specific embodiments of an in-cell touch panel, a driving method thereof, and a display device according to embodiments of the present invention with reference to the accompanying drawings. It should be noted that the embodiments described herein are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The shape and size of the various film layers in the drawings are not intended to reflect the true scale of the layers in an embedded touch screen, but are merely illustrative of the present invention.
The embedded touch screen provided by the embodiment of the invention is suitable for a Twisted Nematic (TN) type liquid crystal display screen, an Advanced Dimension Switch (ADS) type liquid crystal display screen, a High-aperture-ratio advanced Dimension Switch (HADS) type liquid crystal display screen and an In-Plane Switch (IPS) type liquid crystal display screen.
Specifically, an in-cell touch screen provided by an embodiment of the present invention, as shown in fig. 2, includes: the display panel comprises a display area A provided with a gate signal line 201, a data signal line 202 and a touch scanning signal line 203, and a non-display area B provided with a fan-out area F and a driving circuit area, wherein the fan-out area F is positioned between the display area A and the driving circuit area, the gate signal line 201 or the data signal line 202 extends to the fan-out area F, and the driving circuit area comprises a driving chip 204; the in-cell touch screen further comprises: a first switching transistor 205 and a touch-on signal line 206; wherein the content of the first and second substances,
The gate of the first switching transistor 205 is connected to the touch-on signal line 206, the source is connected to the gate signal line 201 or the data signal line 202, and the drain is connected to the touch-scan signal line 203;
In the touch time period, the touch start signal line 206 controls the first switching transistor 205 to be turned on, so that the touch scanning signal output by the driving chip 204 is transmitted to the touch scanning signal line 203 through the gate signal line 201 or the data signal line 202;
In a display time period, the touch-on signal line 206 controls the first switching transistor 205 to be turned off, so that the gate scanning signal or the gray-scale signal output by the driving chip 204 is transmitted on the gate signal line 201 or the data signal line 202.
As can be seen from the above description, in the in-cell touch screen provided in the embodiment of the present invention, the gate signal line 201 or the data signal line 202 can transmit the touch scan signal and the display signal in time division by only adding the first switch transistor 205 and the touch start signal line 206, so as to implement the touch function and the display function, thereby greatly reducing the number of wires in the fan-out area F, and greatly reducing the number of pins on the driving chip 204 corresponding to the wires in the fan-out area F, thereby improving the quality of the in-cell touch screen and reducing the manufacturing cost.
It should be noted that, in the in-cell touch screen provided by the embodiment of the invention, during the touch time period, the touch scan signal output by the driving chip 204 is transmitted to the touch scan signal line 203 through the gate signal line 201 or the data signal line 202, and is also transmitted on the gate signal line 201 or the data signal line 202, that is, the gate signal line 201 and the touch scan signal line 203 or the data signal line 202 and the touch scan signal line 203 simultaneously load the touch scan signal line 203, so that the signal waveform on the gate signal line 201 or the data signal line 202 is consistent with the signal waveform on the touch scan signal line 203 during the touch time period, thereby reducing the load caused by capacitive coupling on the touch scan signal line 203 and improving the touch accuracy.
Further, in the in-cell touch screen provided by the embodiment of the present invention, as shown in fig. 2, the in-cell touch screen further includes: a flexible circuit board (not shown) bonded on the in-cell touch screen for applying an electrical signal to the touch-on signal line 206 to turn on or off the first switching transistor 205. Therefore, the driving chip 204 may be disposed on a side of the flexible circuit board away from the display surface of the in-cell touch screen, and a flip chip is generally disposed between the driving chip 204 and the flexible circuit board.
In a specific implementation, the in-cell touch screen provided by the embodiment of the invention can be an in-cell touch screen based on a self-capacitance principle or an in-cell touch screen based on a mutual capacitance principle. Specifically, when the in-cell touch screen provided by the embodiment of the invention is based on the self-capacitance principle, the gate signal line 201 or the data signal line 202 transmits the touch scan signal output by the driving chip 204 to the self-capacitance electrode through the touch scan signal line 203; when the in-cell touch panel provided by the embodiment of the invention is based on the mutual capacitance principle, the gate signal lines 201 or the data signal lines 202 transmit the touch scan signals output by the driving chip 204 to the touch driving electrodes through the touch scan signal lines 203.
In addition, in order to avoid adding a new touch electrode film layer, in the embedded touch screen provided in the embodiment of the present invention, as shown in fig. 3, the pattern of the common electrode layer may be changed to be divided into a plurality of mutually independent common electrodes 207, and each common electrode 207 may be reused as a self-capacitance electrode or a touch driving electrode. Meanwhile, in order to avoid forming a touch blind area, the touch scanning signal lines 203 and the common electrodes 207 multiplexed as self-capacitance electrodes or touch driving electrodes are generally arranged in different layers, and the touch scanning signal lines 203 arranged in different layers are connected with the common electrodes 207 multiplexed as self-capacitance electrodes or touch driving electrodes through the Via holes Via; further, in order to ensure production efficiency and reduce production cost without adding a new film layer as much as possible, in a specific implementation, the touch scan signal line 203 and the gate signal line 201 may be disposed in the same layer, or disposed in the same layer as the data signal line 202, which is not limited herein.
Specifically, to implement multiplexing of the touch electrode and the common electrode, as shown in fig. 2, the in-cell touch screen provided in the embodiment of the present invention may further include: a second switching transistor 208, a touch-off signal line 209, and a common electrode signal line 210; wherein the content of the first and second substances,
The gate of the second switching transistor 208 is connected to the touch-off signal line 209, the drain is connected to the touch-scan signal line 203, and the source is connected to the common electrode signal line 210;
In the touch time period, the touch-off signal line 209 controls the second switching transistor 208 to be turned off, so that the touch scanning signal output by the driving chip 204 is transmitted to the touch scanning signal line 203 through the gate signal line 201 or the data signal line 202, and is transmitted from the touch scanning signal line 203 to the common electrode 207 multiplexed as a self-capacitance electrode or a touch driving electrode;
In the display time period, the touch-off signal line 209 controls the second switching transistor 208 to be turned on, so that the common electrode signal output by the common electrode signal line 210 is transmitted on the touch-scanning signal line 203 and transmitted to the common electrode 207 through the touch-scanning signal line 203.
Specifically, in the in-cell touch screen provided by the embodiment of the present invention, the flexible circuit board may be further configured to apply an electrical signal for controlling the second switching transistor 208 to be turned on or off to the touch off signal line 209.
In a specific implementation, in the in-cell touch screen provided in the embodiment of the invention, the first switch transistor 205, the second switch transistor 208, the touch on signal line 206, the touch off signal line 209, and the common electrode signal line 210 are all located between the display area a and the fan-out area F, that is, they can be disposed at the near end of the data signal line 202 below the display area a as shown in fig. 2; alternatively, the first and second electrodes may be,
The first switch transistor 205, the second switch transistor 208, the touch-on signal line 206, the touch-off signal line 209 and the common electrode signal line 210 are all located in the non-display area B on the side of the display area a away from the fan-out area F, i.e. they can be located at the far end of the data signal line 202 above the display area a as shown in fig. 2.
It should be noted that, in the in-cell touch panel provided in the embodiment of the invention, the first switch transistor 205, the second switch transistor 208, the touch-on signal line 206, the touch-off signal line 209 and the common electrode signal line 210 may be disposed not only on the upper side or the lower side of the display area a as shown in fig. 2, but also on the left side or the right side of the display area a, which is not limited herein.
In a specific implementation, in the in-cell touch panel provided in the embodiment of the invention, the first switch transistor 205 is an N-type switch transistor or a P-type switch transistor; and/or the second switching transistor 208 is an N-type switching transistor or a P-type switching transistor, which is not limited herein; the N-type switching transistor is switched on under the action of a high level and switched off under the action of a low level; the P-type switching transistor is turned on under the action of low level and turned off under the action of high level. In an implementation, the source and the drain of the first switching transistor 205 may be interchanged, and the source and the drain of the second switching transistor 208 may be interchanged, which is not specifically distinguished herein.
Based on the same inventive concept, embodiments of the present invention provide a driving method for an in-cell touch screen, and because a principle of the driving method for solving the problem is similar to a principle of the driving method for solving the problem of the in-cell touch screen, the implementation of the driving method provided by embodiments of the present invention can refer to the implementation of the in-cell touch screen provided by embodiments of the present invention, and repeated details are omitted.
Specifically, the method for driving the in-cell touch screen according to the embodiment of the present invention, as shown in fig. 4a, may specifically include the following steps:
S401, in a touch time period, controlling the first switching transistor to be turned on through a touch starting signal line so that a grid signal line or a data signal line transmits a touch scanning signal output by a driving chip to a touch scanning signal line;
S402, in a display time period, the first switch transistor is controlled to be turned off through the touch control starting signal line, so that the grid signal line or the data signal line transmits a grid scanning signal or a gray scale signal output by the driving chip.
In specific implementation, when the common electrode is multiplexed as the self-capacitance electrode or the touch driving electrode, in the driving method provided in the embodiment of the present invention, in the step S401, in the touch time period, the first switching transistor is controlled to be turned on by the touch-on signal line, so that the gate signal line or the data signal line transmits the touch scanning signal output by the driving chip to the touch scanning signal line, and at the same time, the following steps may be further performed:
In the touch control time period, the second switch transistor is controlled to be closed through the touch control closing signal line, so that the grid signal line or the data signal line transmits the touch control scanning signal output by the driving chip to the touch control scanning signal line; that is, in the touch time period, step S401' shown in fig. 4b is executed, in the touch time period, the first switch transistor is controlled to be turned on by the touch-on signal line, and the second switch transistor is controlled to be turned off by the touch-off signal line, so that the gate signal line or the data signal line transmits the touch scanning signal output by the driving chip to the touch scanning signal line.
In addition, when the step S402 is executed in the display time period, the first switching transistor is controlled to be turned off by the touch-control on signal line, so that the gate signal line or the data signal line transmits the gate scanning signal or the gray scale signal output by the driving chip, and at the same time, the following steps may also be executed:
In a display time period, the second switch transistor is controlled to be turned on through the touch closing signal line, so that a common electrode signal output by the common electrode signal line is transmitted to the touch scanning signal line; in other words, in the display time period, step S402' shown in fig. 4b is executed, and in the display time period, the first switching transistor is controlled to be turned off by the touch-control turn-on signal line, so that the gate signal line or the data signal line transmits the gate scanning signal or the gray scale signal output by the driving chip; and the second switch transistor is controlled to be turned on through the touch closing signal line, so that the common electrode signal output by the common electrode signal line is transmitted to the touch scanning signal line.
In order to better understand the driving method provided by the embodiment of the present invention, the following description will be made in detail by taking the example of driving the in-cell touch screen as shown in fig. 2.
Specifically, in the in-cell touch panel shown in fig. 2, the data signal line 202 provides the touch scan signal and the gray scale signal in a time-sharing manner, the common electrode 207 is multiplexed as a self-capacitance electrode, the first switch transistor 205 is an N-type switch transistor, and the second switch transistor 208 is an N-type switch transistor.
The in-cell touch panel shown in fig. 2 is driven with the driving timing shown in fig. 5. The time for displaying each frame (V-sync) of the embedded Touch screen is divided into a Display time period (Display) and a Touch time period (Touch), and the Touch time period and the duration of the Display time period are reasonably set according to the processing capacity of the driving chip. In a Display period (Display), the Gate driving chip sequentially applies a Gate scan signal to each of Gate signal lines Gate1, Gate2, … …, Gate-1, Gate n in the inline touch screen; applying a low-level signal to the first switching transistor through a Touch-control starting signal line Touch on to enable the first switching transistor to be closed, and transmitting a gray-scale signal output by the driving chip to the pixel electrode through a Data signal line Data; meanwhile, a high-level signal is applied to the second switching transistor through a Touch off signal line Touch off, so that the second switching transistor is turned on, and a common electrode signal on a common electrode signal line Vcom is transmitted to a common electrode through a Touch scanning signal line Tx, so that an electric field for controlling liquid crystal molecule deflection is formed between the common electrode and a pixel electrode, and a display function is realized. In a Touch time period (Touch), applying a high-level signal to the first switching transistor through a Touch start signal line Touch on to enable the first switching transistor to be started; a low-level signal is applied to the second switching transistor through a Touch off signal line Touch off, so that the second switching transistor is turned off, and thus, a Touch scanning signal output by the driving chip can be loaded to a self-capacitance electrode (namely a common electrode) through a Touch scanning signal line Tx by a Data signal line Data, and a feedback signal of the self-capacitance electrode is transmitted to the driving chip through the Data signal line Data, so that whether Touch occurs or not is judged through analysis of the feedback signal, and a Touch function is realized; in addition, when the Data signal line Data loads the touch scanning signal output by the driving chip to the self-capacitance electrode through the touch scanning signal line Tx, the touch scanning signal is also transmitted on the Data signal line Data, so that the load caused by capacitive coupling on the touch scanning signal line Tx can be reduced, and the touch precision is improved. In order to further reduce the load caused by the capacitive coupling on the touch scan signal line Tx, the same touch scan signal as that on the touch scan signal line Tx may be sequentially applied to each of the Gate signal lines Gate1, Gate2, … …, Gate n-1, Gate n in the embedded touch screen through the Gate driving chip during the touch time period.
Based on the same inventive concept, an embodiment of the present invention further provides a display device, including the in-cell touch screen provided in the embodiment of the present invention, where the display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, an intelligent watch, a fitness wrist strap, and a personal digital assistant. The implementation of the display device can be referred to the embodiment of the in-cell touch screen, and repeated details are not repeated.
In the embedded touch screen, the driving method thereof and the display device provided by the embodiment of the invention, the first switch transistor is controlled to be turned on by the touch-control turn-on signal line in the touch-control time period, so that the touch-control scanning signal output by the driving chip is transmitted to the touch-control scanning signal line through the grid signal line or the data signal line to realize the touch-control function; in the display time period, the first switch transistor is controlled to be turned off through the touch control starting signal line, so that the grid scanning signal or the gray scale signal output by the driving chip is transmitted on the grid signal line or the data signal line to realize the display function. In the embodiment of the invention, the grid signal line or the data signal line can transmit the touch scanning signal and the display signal in a time-sharing manner only by adding the first switch transistor and the touch starting signal line so as to realize the touch function and the display function, so that the wiring number of the fan-out area is greatly reduced, the number of pins corresponding to the wiring of the fan-out area is also greatly reduced, the quality of the embedded touch screen is improved, and the manufacturing cost is reduced.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. An in-cell touch screen, comprising: the display device comprises a display area provided with a grid signal line, a data signal line and a touch scanning signal line, and a non-display area provided with a fan-out area and a driving circuit area, wherein the grid signal line or the data signal line extends to the fan-out area, and the driving circuit area comprises a driving chip; it is characterized by also comprising: the touch control circuit comprises a first switch transistor, a touch control starting signal line, a second switch transistor, a touch control closing signal line and a common electrode signal line; wherein the content of the first and second substances,
The grid electrode of the first switch transistor is connected with the touch control starting signal line, the source electrode of the first switch transistor is connected with the grid signal line or the data signal line, and the drain electrode of the first switch transistor is connected with the touch control scanning signal line;
In a touch time period, the touch start signal line controls the first switch transistor to be started, so that a touch scanning signal output by the driving chip is transmitted to the touch scanning signal line through the grid signal line or the data signal line, and the touch scanning signal is loaded on the touch scanning signal line and the grid signal line or the touch scanning signal line and the data signal line simultaneously;
In a display time period, the touch control starting signal line controls the first switch transistor to be closed so that a grid scanning signal or a gray scale signal output by the driving chip is transmitted on the grid signal line or the data signal line;
The grid electrode of the second switch transistor is connected with the touch closing signal line, the drain electrode of the second switch transistor is connected with the touch scanning signal line, and the source electrode of the second switch transistor is connected with the common electrode signal line;
In a touch time period, the touch closing signal line controls the second switch transistor to be closed so that a touch scanning signal output by the driving chip is transmitted to the touch scanning signal line through the grid signal line or the data signal line;
In a display time period, the touch closing signal line controls the second switching transistor to be turned on, so that the common electrode signal output by the common electrode signal line is transmitted on the touch scanning signal line.
2. The in-cell touch screen of claim 1, further comprising: a flexible circuit board bound on the embedded touch screen;
The flexible circuit board is used for loading an electric signal for controlling the first switching transistor to be switched on or switched off to the touch control starting signal line.
3. The in-cell touch screen of claim 1, further comprising: and the self-capacitance electrode is connected with the touch scanning signal line and is multiplexed as a common electrode.
4. The in-cell touch screen of claim 1, further comprising: and the touch driving electrode is connected with the touch scanning signal line and is reused as a common electrode.
5. The in-cell touch screen of claim 2, wherein the flexible circuit board is further configured to apply an electrical signal to the touch-off signal line to control the second switch transistor to turn on or off.
6. The in-cell touch screen of claim 4, wherein the first switch transistor, the second switch transistor, the touch-on signal line, the touch-off signal line, and the common electrode signal line are all located between the display area and the fan-out area; alternatively, the first and second electrodes may be,
The first switch transistor, the second switch transistor, the touch-control opening signal line, the touch-control closing signal line and the common electrode signal line are all located in the non-display area on one side, far away from the fan-out area, of the display area.
7. A display device comprising the in-cell touch screen of any of claims 1-6.
8. The method for driving the in-cell touch screen according to any one of claims 1 to 6, comprising:
In a touch time period, controlling the first switching transistor to be switched on through a touch starting signal line so as to enable a grid signal line or a data signal line to transmit a touch scanning signal output by a driving chip to a touch scanning signal line and enable the touch scanning signal line and the grid signal line or the touch scanning signal line and the data signal line to load the touch scanning signal simultaneously;
In a display time period, controlling the first switch transistor to be turned off through the touch control starting signal line so that the grid signal line or the data signal line transmits a grid scanning signal or a gray scale signal output by the driving chip;
In a touch time period, controlling the second switch transistor to be closed through a touch closing signal line so that the grid signal line or the data signal line transmits a touch scanning signal output by the driving chip to the touch scanning signal line;
And in a display time period, the second switch transistor is controlled to be turned on through the touch closing signal line, so that the common electrode signal output by the common electrode signal line is transmitted to the touch scanning signal line.
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| CN107817638B (en) * | 2017-11-22 | 2021-09-07 | 上海天马微电子有限公司 | Array substrate, display panel and display device |
| CN111971736B (en) * | 2019-01-16 | 2023-07-28 | 京东方科技集团股份有限公司 | Shift register, driving method and device thereof |
| CN110515498A (en) * | 2019-08-30 | 2019-11-29 | 联想(北京)有限公司 | A kind of information processing method and electronic equipment |
| CN110750170B (en) * | 2019-09-25 | 2023-08-29 | 昆山龙腾光电股份有限公司 | Embedded touch display panel, driving method thereof and display device |
| CN110718201B (en) * | 2019-10-24 | 2021-09-28 | 厦门骏陆科技有限公司 | Liquid crystal driving chip capable of reducing pin number |
| CN110989855A (en) * | 2019-11-01 | 2020-04-10 | 武汉华星光电技术有限公司 | Embedded touch array substrate and touch panel |
| CN111651087B (en) * | 2020-06-11 | 2022-06-28 | 厦门天马微电子有限公司 | Display panel and display device |
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| CN203849723U (en) * | 2014-05-28 | 2014-09-24 | 京东方科技集团股份有限公司 | Capacitance type embedded touch screen and display device |
| CN104657024A (en) * | 2015-03-13 | 2015-05-27 | 京东方科技集团股份有限公司 | Built-in touch screen and display device |
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