Touch display driving circuit, control method thereof and touch display driving device

Abstract

The invention discloses a touch display driving circuit, a control method thereof and a touch display driving device, and the touch display driving circuit comprises a first driving chip which is configured to send a touch enable signal to a time schedule controller, and send a touch driving signal to a touch display module when the touch enable signal is in a first level state, a touch sensing signal sent by the touch display module is received; the time schedule controller is configured to send a vertical synchronization signal to the second driving chip; the second driving chip is configured to generate a backlight driving signal and stop sending the backlight driving signal to the backlight plate when the vertical synchronizing signal is in a fourth level state; the starting time of the touch control enable signal in the state of any one first level is the same as the starting time of the vertical synchronization signal in the state of any one fourth level, and the ending time of the touch control enable signal in the state of any one first level is the same as the ending time of the vertical synchronization signal in the state of any one fourth level.

Description

Technical Field

[0001] The present disclosure relates to, but is not limited to, touch display technology, and specifically to a touch display driving circuit and a control method thereof, and a touch display driving device. Background Art

[0002] Light Emitting Diode (LED) technology has been developed for nearly three decades, from the initial solid-state lighting power supply to the backlight source in the display field to the LED display screen, providing a solid foundation for its wider application. Among them, with the development of chip manufacturing and packaging technology, backlight sources using submillimeter or even micron-level micro-inorganic light-emitting diodes have been widely used. Backlight sources using micro-inorganic light-emitting diodes can achieve local dimming and high dynamic range image (HDR) display. Summary of the invention

[0003] The following is a summary of the subject matter of the detailed description of the present disclosure. This summary is not intended to limit the scope of the claims.

[0004] In a first aspect, the present disclosure provides a touch display driving circuit, which is electrically connected to a backlight panel and a touch display module, respectively, and the touch display driving circuit includes: at least one first driving chip, at least one second driving chip and a timing controller;

[0005] The first driver chip is electrically connected to the timing controller and the touch display module, respectively, and is configured to send a touch enable signal to the timing controller, and is also configured to send a touch drive signal to the touch display module when the touch enable signal is at a first level, and receive a touch sensing signal sent by the touch display module, and stop sending a touch drive signal to the touch display module when the touch enable signal is at a second level;

[0006] The timing controller is electrically connected to the second driving chip and is configured to send a vertical synchronization signal to the second driving chip;

[0007] The second driving chip is configured to generate a backlight driving signal, and is further configured to send the backlight driving signal to the backlight panel when the vertical synchronization signal is at a third level, and stop sending the backlight driving signal to the backlight panel when the vertical synchronization signal is at a fourth level;

[0008] The start time of the touch enable signal in any first level state is the same as the start time of the vertical synchronization signal in any fourth level state, and the end time of the touch enable signal in any first level state is the same as the end time of the vertical synchronization signal in any fourth level state.

[0009] In an exemplary embodiment, the start time of the touch enable signal in any second level state is the same as the start time of the vertical synchronization signal in any third level state, and the end time of the touch enable signal in any second level state is the same as the end time of the vertical synchronization signal in any third level state.

[0010] In an exemplary embodiment, an absolute value of the first level is greater than or less than an absolute value of the second level;

[0011] An absolute value of the third level is smaller than an absolute value of the fourth level.

[0012] In an exemplary embodiment, the timing controller is further configured to send backlight data to the second driving chip when the vertical synchronization signal is at a fourth level, the backlight data comprising: a brightness value of a backlight panel;

[0013] The second driving chip is further configured to generate a backlight driving signal according to the backlight data.

[0014] In an exemplary embodiment, the second driving chip includes: a first memory and a second memory;

[0015] The first memory and the second memory are configured to store the backlight data.

[0016] In an exemplary embodiment, the touch display driving circuit is configured to drive a plurality of display frames to be displayed, and a time period for displaying a frame of display images includes: a display time period and a non-display time period;

[0017] The touch enable signal is at the second level in the display time period and at the first level in the non-display time period. The vertical synchronization signal is at the third level in the display time period and at the fourth level in the non-display time period.

[0018] In an exemplary embodiment, the non-display time period includes: at least one of: a time period for transmitting an uplink signal, a time period for touching an external electrical component, a time period for touching a biological limb, an idle time period, a noise detection time period and a reserved time period; the uplink signal includes: a handshake signal for interaction between the first driver chip and the external electrical component, and the reserved time period is a time period for internal operations of the first driver chip and a time period for partial signals of the first driver chip and the timing controller.

[0019] In an exemplary embodiment, when the number of display time periods in a time period in which one frame of display picture is displayed is one, the number of non-display time periods is two, the display time period is located between the two non-display time periods, and the first non-display time period occurs before the display time period;

[0020] The first non-display time period includes: an uplink signal transmission time period, and the second non-display time period includes: at least one of: an external electrical element touch time period, a biological limb touch time period, an idle time period, a noise detection time period, and a reserved time period;

[0021] The first memory stores backlight data corresponding to a current frame display picture, and the second memory stores backlight data corresponding to a next frame display picture.

[0022] In an exemplary embodiment, when the number of display time periods in the time period in which one frame of display picture is displayed is plural, the number of non-display time periods is plural, and the display time periods and the non-display time periods occur alternately;

[0023] The first non-display time period occurs before the first display time period, and the first non-display time period includes: a time period for transmitting an uplink signal, and any non-display time period other than the first non-display time period includes: at least one of: a peripheral electrical component touch time period, a biological limb touch time period, an idle time period, a noise detection time period, and a reserved time period;

[0024] The first memory and the second memory both store backlight data corresponding to the current frame display picture.

[0025] In an exemplary embodiment, when the transmission time of the backlight data corresponding to the current frame display image is less than the duration of any non-display time period, the timing controller is also configured to transmit the backlight data corresponding to the current frame display image to one of the first memory and the second memory during the first non-display time period, and to transmit the backlight data corresponding to the current frame display image to the other of the first memory and the second memory during the second non-display time period.

[0026] In an exemplary embodiment, in a state where the transmission time of the backlight data corresponding to the current frame display picture is greater than the duration of any non-display time period, the timing controller is configured to divide the backlight data corresponding to the current frame display picture into the first backlight data to the Nth backlight data, and send the nth backlight data to one of the first memory and the second memory in the nth non-display time period, and send the nth backlight data to the other of the first memory and the second memory in the 2nth non-display time period, 1≤n≤N, and N is a positive integer greater than or equal to 2;

[0027] The second driving chip is configured to generate a backlight driving signal after the timing controller completes sending the backlight data corresponding to the current frame display picture.

[0028] In an exemplary embodiment, the second driver chip is configured to generate a backlight drive signal according to the backlight data in one of the first memory or the second memory in a non-display time period after the timing controller completes sending the backlight data corresponding to the current frame display image, and to generate a backlight drive signal according to the backlight data in the other of the first memory or the second memory in the next non-display time period.

[0029] In an exemplary embodiment, the second driving chip includes: a plurality of input pins, a plurality of first power pins, a plurality of second power pins, a plurality of selection output pins and a plurality of channel pins, and the timing controller includes: a timing control circuit, a boost circuit and a buck circuit;

[0030] The timing control circuit is electrically connected to a plurality of input pins, the boost circuit is electrically connected to a plurality of first power pins, the buck circuit is electrically connected to a plurality of second power pins, and the backlight panel is electrically connected to a plurality of selection output pins and a plurality of channel pins respectively;

[0031] The input pins include: a vertical synchronization pin, an enable pin, a debug pin, and a serial peripheral interface pin; the first power pins include: a backlight power pin, a backlight ground pin, a feedback pin, and a feedback ground pin; the second power pins include: an analog power pin and an analog ground pin;

[0032] The vertical synchronization pin is configured to transmit the vertical synchronization signal, and the serial peripheral interface pin is configured to transmit the backlight data.

[0033] In an exemplary embodiment, the first driving chip is further configured to send a tearing effect signal to the timing controller and provide a clock signal and a touch enable signal to the touch display module, wherein the tearing effect signal includes: a start signal and an end signal of a frame of display;

[0034] The timing control circuit is also respectively configured with the boost circuit and the buck circuit to provide a first power signal to the boost circuit, a second power signal to the buck circuit, and a third power signal and an image data signal to the touch display module.

[0035] In a second aspect, the present disclosure further provides a touch display device, comprising: a backlight panel, a touch display module and the above-mentioned touch display driving circuit.

[0036] In an exemplary embodiment, the backlight panel includes: a plurality of light emitting areas, at least one of the light emitting areas includes: a plurality of light emitting devices, the light emitting devices include: micro inorganic light emitting diodes;

[0037] At least one second control chip is electrically connected to a plurality of light-emitting regions, and the light-emitting regions are electrically connected to one of the selection output pins and one of the channel pins.

[0038] In an exemplary embodiment, output times of signals of any two selection output pins among the plurality of selection output pins do not overlap, and output times of signals of any two channel pins among the plurality of channel pins do not overlap.

[0039] The output time of a signal of any channel pin overlaps with the output time of a signal of any selection output pin, and the output time of a signal of any selection output pin is greater than or equal to the sum of the output times of signals of multiple channel pins.

[0040] In an exemplary embodiment, the touch display driving circuit is configured to drive a plurality of display frames to be displayed, and a time period for displaying a frame of display images includes: a display time period and a non-display time period;

[0041] The touch display module comprises: a plurality of gate lines, a plurality of first touch signal lines, a plurality of second touch signal lines and a gate drive circuit;

[0042] The gate driving circuit is electrically connected to the first driving chip and the plurality of gate lines respectively, and is configured to send gate driving signals to the plurality of gate lines in sequence during a display time period under the control of a clock signal and a touch enable signal sent by the first driving chip;

[0043] The first driver chip is electrically connected to multiple first touch signal lines and multiple second touch signal lines, and is configured to sequentially send touch drive signals to the multiple first touch signal lines in a partial non-display time period, and sequentially receive touch sensing signals sent by the multiple second touch signal lines.

[0044] In an exemplary embodiment, the touch display module includes: a display side and a non-display side, the backlight panel is located on the non-display side of the touch display module, and the touch display driving circuit includes: at least one first driving chip, at least one second driving chip and a timing controller;

[0045] The first driving chip is arranged on the touch display module, and the second driving chip and the timing controller are arranged on a side of the backlight panel away from the touch display module.

[0046] In an exemplary embodiment, the device further includes: at least one printed circuit board, wherein the printed circuit board and the second driving chip are in a one-to-one correspondence, and the second driving chip is electrically connected to the backlight panel through the corresponding printed circuit board.

[0047] In a third aspect, the present disclosure further provides a control method for a touch display driving circuit, which is configured to control the above-mentioned touch display driving circuit, and the method includes:

[0048] The timing controller sends a vertical synchronization signal to the second driving chip;

[0049] The first driver chip sends a touch enable signal to the timing controller. When the touch enable signal is at a first level, the first driver chip sends a touch drive signal to the touch display module and receives a touch sensing signal sent by the touch display module. When the touch enable signal is at a second level, the first driver chip stops sending the touch drive signal to the touch display module.

[0050] The second driver chip generates a backlight driving signal, and the second driver chip also sends the backlight driving signal to the backlight panel when the vertical synchronization signal is at a third level, and stops sending the backlight driving signal to the backlight panel when the vertical synchronization signal is at a fourth level.

[0051] The method further includes: the timing controller sends backlight data to the second driving chip when the vertical synchronization signal is at a fourth level, the backlight data including: a brightness value of the backlight panel;

[0052] The second driving chip generating the backlight driving signal includes: the second driving chip generating the backlight driving signal according to the backlight data.

[0053] Other aspects will be apparent upon reading and understanding the drawings and detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The accompanying drawings are used to provide an understanding of the technical solution of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the technical solution of the present disclosure and do not constitute a limitation on the technical solution of the present disclosure.

[0055] Figure 1 A schematic diagram of the structure of a touch display driving circuit provided in an embodiment of the present disclosure;

[0056] Figure 2 It is the timing diagram of touch enable signal and vertical synchronization signal;

[0057] Figure 3 is a schematic structural diagram of a second driver chip;

[0058] Figure 4 A corresponding relationship between a time period of displaying a frame of display picture and a timing of a touch enable signal and a vertical synchronization signal;

[0059] Figure 5 A second correspondence between a time period of a frame displayed by the display panel and a timing of a touch enable signal and a vertical synchronization signal;

[0060] Figure 6 A schematic diagram of the structure of a touch display driving circuit provided by an exemplary embodiment;

[0061] Figure 7 A schematic diagram of the connection between the timing control circuit and the serial peripheral interface pins of the plurality of second driver chips;

[0062] Figure 8 A schematic diagram of the structure of a touch display device provided in an embodiment of the present disclosure;

[0063] Fig. 9 A schematic diagram of the connection between the second driving chip and the backlight panel provided in an exemplary embodiment;

[0064] Fig.10 A schematic diagram of the connection of a backlight panel provided for an exemplary embodiment;

[0065] Fig.11 Timing diagrams for signals of multiple select output pins and signals of multiple channel pins. DETAILED DESCRIPTION

[0066] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the embodiments of the present disclosure will be described in detail in conjunction with the accompanying drawings below. Note that the embodiments can be implemented in multiple different forms. A person of ordinary skill in the art can easily understand the fact that the methods and contents can be transformed into various forms without departing from the purpose and scope of the present disclosure. Therefore, the present disclosure should not be interpreted as being limited to the contents described in the following embodiments. In the absence of conflict, the embodiments in the present disclosure and the features in the embodiments can be arbitrarily combined with each other.

[0067] In the drawings, the size of each component, the thickness of a layer, or the area is sometimes exaggerated for the sake of clarity. Therefore, one embodiment of the present disclosure is not necessarily limited to this size, and the shape and size of each component in the drawings do not reflect the true proportion. In addition, the drawings schematically show ideal examples, and one embodiment of the present disclosure is not limited to the shapes or values ​​shown in the drawings.

[0068] In the present specification, ordinal numbers such as “first”, “second” and “third” are provided to avoid confusion among constituent elements, and are not intended to limit the number.

[0069] In this specification, for the sake of convenience, the words and phrases indicating the orientation or positional relationship, such as "middle", "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., are used to illustrate the positional relationship of the constituent elements with reference to the drawings. This is only for the convenience of describing this specification and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. The positional relationship of the constituent elements is appropriately changed according to the direction in which each constituent element is described. Therefore, it is not limited to the words and phrases described in the specification, and can be appropriately replaced according to the situation.

[0070] In this specification, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate, or the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0071] In this specification, "electrical connection" includes the case where components are connected together through an element having some electrical function. There is no particular limitation on the "element having some electrical function" as long as it can transmit and receive electrical signals between the connected components. Examples of "element having some electrical function" include not only electrodes and wiring, but also switching elements such as transistors, resistors, inductors, capacitors, and other elements having various functions.

[0072] The term "about" in the present disclosure refers to a numerical value that is not strictly limited to allow for process and measurement errors.

[0073] Micro inorganic light-emitting diodes can include micro light-emitting diodes (Micro Light Emitting Diode, Micro LED) and sub-millimeter light-emitting diodes (Mini Light Emitting Diode, Mini LED), which have the advantages of small size and high brightness, and can be widely used in the backlight module of display devices. The display products using micro inorganic light-emitting diode backlight sources can achieve the level of organic light-emitting diode (Organic Light-Emitting Diode, referred to as OLED) display products, which can enable the products to retain the technical advantages of liquid crystal display (Liquid Crystal Display, referred to as LCD), thereby improving the display effect of the picture and providing users with a better visual experience. In addition, micro inorganic light-emitting diode displays have gradually become a hot spot for display panels, mainly used in AR / VR, TV and outdoor display and other fields.

[0074] At present, micro inorganic light emitting diode backlight sources are usually obtained by miniaturizing, arraying, and thin-filming LED chips using miniaturization process technology, and transferring LED chips in batches to the backlight panel through mass transfer technology. The typical size (such as length) of Micro LED can be less than 100μm, such as 10μm to 50μm. The typical size (such as length) of Mini LED can be about 100μm to 300μm, such as 120μm to 260μm. A plurality of micro inorganic light emitting diodes are arranged on the backlight panel. The backlight panel is divided into a plurality of light-emitting areas. Each light-emitting area includes a micro inorganic light-emitting diode, or a plurality of micro inorganic light-emitting diodes with an electrical connection relationship. Each light-emitting area can be independently controlled.

[0075] The display product of Touch and Display Driver Integration (TDDI) includes: a touch display module and a touch display chip, and the touch display chip is configured to provide a touch drive signal and a display drive signal to the touch display module at the same time to realize the time-sharing drive of the touch and display of the TDDI display product. The touch display chip is also configured to receive a touch sensing signal sent by the touch display module. Among them, the touch display chip is a chip formed by integrating the touch chip and the display chip, which can realize a thinner appearance, brighter display and narrow border of the TDDI display product. When the TDDI display product is a liquid crystal display product, the TDDI display product may also include: a backlight panel and a backlight driver chip, wherein the backlight panel includes a plurality of micro inorganic light-emitting diodes. The backlight driver chip is configured to provide a backlight drive signal to the backlight panel to drive the backlight panel to emit light. Since the backlight driving signal is an AC signal, when the output time of the backlight driving signal overlaps with the output time of the touch driving signal or the touch sensing signal, the backlight driving signal will influence and interfere with the touch driving signal or the touch sensing signal, making the touch performance anti-interference ability of the TDDI display product poor, thereby reducing the reliability of the TDDI display product.

[0076] In an exemplary embodiment, the touch display module includes: a display side and a non-display side, wherein the backlight panel may be located on the non-display side of the touch display module.

[0077] In an exemplary embodiment, the touch display module may include: a touch panel and a display panel, wherein the display panel may be a liquid crystal display panel. The display panel includes: a plurality of pixels, at least one pixel includes: a pixel circuit, a common electrode and a liquid crystal layer. The liquid crystal display panel includes: an array substrate and a color filter substrate arranged opposite to each other and a liquid crystal layer arranged between the array substrate and the color filter substrate. The array substrate includes: a thin film transistor array layer, the color filter substrate may include: a color filter layer and a black matrix layer, the pixel electrode may be arranged on the array substrate and electrically connected to the thin film transistor of the thin film transistor array layer, the common electrode may be arranged on the array substrate or the color filter substrate, and the present disclosure does not make any limitation to this.

[0078] In an exemplary embodiment, one luminous area corresponds to at least one pixel area in the display panel, wherein the pixel area is an area where one pixel is located. Exemplarily, the orthographic projection of at least one pixel area on a plane parallel to the display panel falls within the orthographic projection of one luminous area on the same plane, or the orthographic projection of at least one pixel area on a plane parallel to the display panel overlaps with the orthographic projection of one luminous area on the same plane.

[0079] Figure 1A schematic diagram of the structure of a touch display driving circuit provided in an embodiment of the present disclosure, Figure 2 This is the timing diagram of the touch enable signal and the vertical synchronization signal. Figure 1 As shown, the touch display driving circuit 100 provided in the embodiment of the present disclosure is electrically connected to the backlight panel and the touch display module respectively. The touch display driving circuit 100 includes: at least one first driving chip 110, at least one second driving chip 120 and a timing controller 130.

[0080] In an exemplary embodiment, in combination with Figure 1 and Figure 2 As shown, the first driver chip 110 is electrically connected to the timing controller 130 and the touch display module, respectively. The first driver chip 110 is configured to send a touch enable signal TP-EN to the timing controller 130. The first driver chip 110 is also configured to send a touch drive signal to the touch display module and receive a touch sensing signal sent by the touch display module when the touch enable signal TP-EN is at a first level, and stop sending a touch drive signal to the touch display module when the touch enable signal TP-EN is at a second level.

[0081] In an exemplary embodiment, in combination with Figure 1 and Figure 2 As shown, the timing controller 130 is electrically connected to the second driving chip 120 and is configured to send a vertical synchronization signal Vsync to the second driving chip 120 .

[0082] In an exemplary embodiment, in combination with Figure 1 and Figure 2 As shown, the second driver chip 120 is configured to generate a backlight driving signal. The second driver chip 120 is also configured to send the backlight driving signal to the backlight panel when the vertical synchronization signal Vsync is at a third level, and stop sending the backlight driving signal to the backlight panel when the vertical synchronization signal Vsync is at a fourth level.

[0083] In an exemplary embodiment, the touch enable signal TP-EN is a periodic square wave signal.

[0084] In an exemplary embodiment, Figure 2As shown, the start time of the touch enable signal TP-EN in any first level state is the same as the start time of the vertical synchronization signal Vsync in any fourth level state; the end time of the touch enable signal TP-EN in any first level state is the same as the end time of the vertical synchronization signal Vsync in any fourth level state; the start time of the touch enable signal TP-EN in any second level state is the same as the start time of the vertical synchronization signal Vsync in any third level state; the end time of the touch enable signal TP-EN in any second level state is the same as the end time of the vertical synchronization signal Vsync in any third level state.

[0085] The touch enable signal TP-EN in the present disclosure can be used as a reference for the vertical synchronization signal Vsync, and the timing controller determines the output time and output waveform of the vertical synchronization signal through the touch enable signal.

[0086] In an exemplary embodiment, the first driving chip 110 is a touch display chip, wherein the touch display chip can realize both touch function and display function; or the touch display chip can include a touch chip and a display chip which are separately arranged, in which case the touch display chip has better anti-interference capability.

[0087] In an exemplary embodiment, the second driving chip 120 is configured to provide a driving signal to the micro-inorganic light emitting diode to drive the micro-inorganic light emitting diode to emit light.

[0088] In an exemplary embodiment, the touch enable signal TP-EN is a logic control signal output by the first driver chip, which can realize time-sharing driving of display and touch of the touch display module.

[0089] In an exemplary embodiment, the vertical synchronization signal Vsync is used as a control signal of the second driving chip.

[0090] In an exemplary embodiment, the second driving chip may adopt a local backlight adjustment algorithm, so that the content displayed by the backlight panel changes with the change of the picture displayed by the touch display module.

[0091] In an exemplary embodiment, the touch sensing signal is an analog signal. The first driving chip is further configured to process the touch sensing signal and send the processed touch sensing signal to the timing controller.

[0092] In an exemplary embodiment, the second driver chip may include: a touch detection circuit. The touch detection circuit may include: an amplifier circuit, a sampling and holding circuit, and an analog-to-digital conversion circuit. The amplifier circuit is electrically connected to the touch display module and is configured to amplify the touch sensing signal to generate a first signal. The sampling and holding circuit is electrically connected to the amplifier circuit and is configured to sample the first signal to obtain and store the second signal. The analog-to-digital conversion circuit is electrically connected to the sampling and holding circuit and the timing controller, respectively, and is configured to perform analog-to-digital conversion on the second signal to generate point reporting data. The timing controller is also configured to perform touch analysis based on the point reporting data. The touch analysis may include: fingerprint recognition.

[0093] In an exemplary embodiment, the first signal and the second signal are analog signals, and the reporting data is a digital signal.

[0094] In an exemplary embodiment, the touch substrate of the touch display module can be divided into a plurality of touch blocks, and the touch sensing signal sent by each touch block is detected by the touch detection circuit. In the absence of touch, the number of reporting point data obtained by the touch detection circuit is less than 10.

[0095] In an exemplary embodiment, the touch display module may include: a plurality of pixels arranged in an array, the pixel may include: a pixel electrode, a common electrode and a liquid crystal layer, and the pixel electrode and the common electrode are configured to drive the liquid crystal molecules in the liquid crystal layer to deflect.

[0096] In an exemplary embodiment, the first driving chip 110 is configured to send a display driving signal to the touch display module. Exemplarily, the display driving signal may include: a clock signal and a data signal, the clock signal controls the signal for turning on the pixel, and the data signal charges the pixel.

[0097] The touch display driving circuit provided by the embodiment of the present disclosure is electrically connected to the backlight panel and the touch display module respectively, and the touch display driving circuit includes: at least one first driving chip, at least one second driving chip and a timing controller; the first driving chip is electrically connected to the timing controller and the touch display module respectively, and is configured to send a touch enable signal to the timing controller, and is also configured to send a touch drive signal to the touch display module when the touch enable signal is at a first level, and receive a touch sensing signal sent by the touch display module, and stop sending a touch drive signal to the touch display module when the touch enable signal is at a second level, and the touch enable signal is a periodic square wave signal ; A timing controller is electrically connected to the second driver chip and is configured to send a vertical synchronization signal to the second driver chip; the second driver chip is configured to generate a backlight drive signal, and is also configured to send the backlight drive signal to the backlight panel when the vertical synchronization signal is in a third level state, and stop sending the backlight drive signal to the backlight panel when the vertical synchronization signal is in a fourth level state; the start time of the touch enable signal in any first level state is the same as the start time of the vertical synchronization signal in any fourth level state, and the end time of the touch enable signal in any first level state is the same as the end time of the vertical synchronization signal in any fourth level state. The start time of the touch enable signal in any first level state in the present disclosure is the same as the start time of the vertical synchronization signal in any fourth level state, and the end time of the touch enable signal in any first level state is the same as the end time of the vertical synchronization signal in any fourth level state, so that when the first driver chip sends a touch drive signal to the touch display module and receives a touch sensing signal sent by the touch display module, the second driver chip stops sending a backlight drive signal to the backlight panel. That is to say, the touch display drive circuit provided in the present disclosure will not send a backlight drive signal to the backlight panel during the time period of sending a touch drive signal to the touch display module and receiving a touch sensing signal sent by the touch display module, that is, the output time of the backlight drive signal does not overlap with the output time of the touch drive signal or the touch sensing signal, and the backlight drive signal cannot interfere with the touch drive signal and the touch sensing signal, thereby improving the anti-interference capability and reliability of the TDDI display product.

[0098] In the present disclosure, the start time of the touch enable signal TP-EN in any second level state is the same as the start time of the vertical synchronization signal Vsync in any third level state, and the end time of the touch enable signal TP-EN in any second level state is the same as the end time of the vertical synchronization signal Vsync in any third level state. It can be achieved that when the touch enable signal is at the second level, the first driver chip stops sending the touch drive signal to the touch display module, and when the vertical synchronization signal is at the third level, the second driver chip sends the backlight drive signal to the backlight panel. That is to say, the touch display drive circuit provided in the present disclosure will not send the touch drive signal to the touch display module during the time period of sending the backlight drive signal to the backlight panel, that is, the output time of the backlight drive signal does not overlap with the output time of the touch drive signal or the touch sensing signal, and the touch drive signal will not interfere with the backlight drive signal, thereby improving the reliability of the TDDI display product.

[0099] The output time of the touch driving signal and the output time of the backlight driving signal in the present disclosure do not overlap, thereby realizing the time-sharing output of the backlight driving signal and the touch driving signal, and further realizing the time-sharing driving of the backlight panel and the touch display module by the touch display driving circuit.

[0100] In an exemplary embodiment, if Figure 2 As shown, the absolute value of the voltage value of the first level is greater than or less than the absolute value of the voltage value of the second level. Exemplarily, the first level can be a high level and the second level can be a low level, or the first level can be a low level and the second level can be a high level. Figure 2 The description is made by taking the example that the first level may be a low level and the second level may be a high level, and the present disclosure does not make any limitation to this.

[0101] In an exemplary embodiment, if Figure 2 As shown, the absolute value of the third level is less than the absolute value of the fourth level. Exemplarily, the fourth level is a high level and the third level is a low level. In the present disclosure, when the vertical synchronization signal is at a high level, the second driver chip stops sending the backlight driving signal, and when the vertical synchronization signal is at a low level, the second driver chip sends the backlight driving signal, and the backlight panel starts working to cooperate with the touch display module to realize display.

[0102] In an exemplary embodiment, if Figure 1 As shown, the first driver chip 110 is also configured to send a tear effect (TE) signal to the timing controller 130, and provide a clock signal and a touch enable signal to the touch display module, wherein the tear effect refers to the screen effect caused by the touch display module starting to write data for the next frame of display before the previous frame of display is fully displayed.

[0103] In an exemplary embodiment, the TE signal may include: a start signal and an end signal of a frame of display. The first driver chip sends a TE signal to the timing controller to prevent the screen from being torn due to inconsistent read and write speeds of the touch display driver circuit, which causes the previous frame of display to be written before the previous frame of display is fully displayed.

[0104] In an exemplary embodiment, the TE signal may also be output to the touch display module as a synchronization signal of the first driving chip, so that the first driving chip and the touch display module may perform frame alignment operations according to the TE signal.

[0105] In an exemplary embodiment, the timing controller 130 is further configured to send backlight data to the second driver chip 120 when the vertical synchronization signal is at a fourth level, the backlight data including: a brightness value of the backlight panel; the second driver chip 120 is further configured to generate a backlight driving signal according to the backlight data.

[0106] In an exemplary embodiment, the timing controller and the second driving chip both include a serial peripheral interface (SPI). The backlight data is data that can be transmitted on the SPI. The backlight data needs to be updated once when each frame of the display is displayed.

[0107] In an exemplary embodiment, the backlight data is obtained by the timing controller after processing the received image data, and the second driver chip can obtain the light-emitting area to be lit and the brightness of the light-emitting area to be lit according to the backlight data. When the touch display module displays different pictures, the backlight data generated by the timing controller is different, and the brightness of the light-emitting area to be lit and the light-emitting ball to be lit will also be different.

[0108] In an exemplary embodiment, Figure 3 is a schematic diagram of the structure of the second driver chip. Figure 3 As shown, the second driving chip 120 may include: a first memory 121 and a second memory 122. The first memory and the second memory are configured to store backlight data.

[0109] In an exemplary embodiment, the first memory 121 and the second memory 122 may be high-speed random access memory (RAM), or may be stable non-volatile memory (NVM), such as a disk memory.

[0110] In an exemplary embodiment, the touch display driving circuit is configured to drive a plurality of display frames to be displayed. Figure 4The corresponding relationship between the time period of a frame display and the timing of the touch enable signal and the vertical synchronization signal is 1. Figure 5 The second correspondence relationship between the time period of a frame of display panel display and the timing of the touch enable signal and the vertical synchronization signal. Figure 4 and Figure 5 As shown, the time period for displaying a frame of display picture includes: a display time period Display-Time and a non-display time period. Among them, the touch enable signal TP-EN is at the second level in the display time period Display-Time and at the first level in the non-display time period, and the vertical synchronization signal Vsync is at the third level in the display time period Display and at the fourth level in the non-display time period.

[0111] In an exemplary embodiment, the non-display time period may include at least one of: an uplink signal transmission time period Uplink-Time, an external electrical element touch time period Pen-Time, a biological limb touch time period Finger-Time, an idle time period Dummy-Time, a noise detection time period Noise Detect-Time, and a reserved time period Reserved-Time. Wherein, the uplink signal includes: a handshake signal for the first driver chip to interact with the external electrical element, and the reserved time period is the internal operation of the first driver chip and the time period for the first driver chip to align some signals with the timing controller. Wherein, the external electrical element touch time period Pen-Time refers to the time period when the external electrical element contacts the touch display module, the biological limb touch time period Finger-Time refers to the time period when the biological limb contacts the touch display module, the noise detection time period Noise Detect-Time refers to the time period for detecting the noise of the touch display module, and the idle time period Dummy-Time refers to the time period without any operation.

[0112] In an exemplary embodiment, device A and device B use a communication specification (protocol) to exchange data, and the interaction process between them is called "handshake", and the signal used for interaction is called "handshake signal". The handshake signal for the first driver chip to interact with the peripheral electrical component refers to the signal for the first driver chip to interact with the peripheral electrical component.

[0113] In an exemplary embodiment, the touch input operation can be implemented by a biological limb (such as a finger) or an external electrical element. The external electrical element can include: a capacitive active pen or an electromagnetic pen.

[0114] In an exemplary embodiment, when the external electrical component is an electromagnetic pen, the driving mode of the first driving chip may be different from the driving mode of the first driving chip when the external electrical component is an active capacitive pen.

[0115] In an exemplary embodiment, the time period for displaying a frame of display picture may include: at least one display time period. Figure 4 and Figure 5 The description is made by taking the example that the time period for displaying one frame of display picture includes: multiple display time periods.

[0116] In an exemplary embodiment, the number of display time periods in a time period in which one frame of display picture is displayed may be consistent with the number of divisions of the clock signal output by the first driving chip in a time period in which one frame of display picture is displayed.

[0117] In an exemplary embodiment, a time period during which a frame of display picture is displayed may include: a plurality of non-display time periods.

[0118] In an exemplary embodiment, when the number of display time periods Display-Time in the time period of displaying a frame of display picture is one, the number of non-display time periods is two, the display time period Display-Time is located between the two non-display time periods, and the first non-display time period occurs before the display time period Display-Time. At this time, the first non-display time period includes: an uplink signal transmission time period, and the second non-display time period includes: at least one of an external electrical component touch time period, a biological limb touch time period, an idle time period, a noise detection time period, and a reserved time period.

[0119] In an exemplary embodiment, the vertical synchronization signal changes from the fourth level to the third level, that is, the falling edge of the vertical synchronization signal means that the second driver chip needs to obtain backlight data from the memory to generate a backlight drive signal. Adjacent falling edges obtain backlight data from different memories. Therefore, when the number of display time periods in the time period of displaying a frame of display picture is one, the first memory stores the backlight data corresponding to the current frame of display picture, and the second memory can store the backlight data corresponding to the next frame of display picture.

[0120] In an exemplary embodiment, Figure 4 and Figure 5As shown, when the number of display time periods Display-Time in the time period of displaying a frame of display picture is multiple, the number of non-display time periods is multiple, and the display time period Display-Time and the non-display time period occur alternately. The first non-display time period occurs before the first display time period, and the first non-display time period includes: the uplink signal transmission time period Uplink-Time, and any non-display time period other than the first non-display time period includes: at least one of the peripheral electrical element touch time period Pen-Time, the biological limb touch time period Finger-Time, the idle time period Dummy-Time, the noise detection time period Noise Detect-Time and the reserved time period Reserved-Time. Figure 4 The following description is made by taking the case that the number of display time periods in the time period displayed by one frame of display picture is 11 and the number of non-display time periods in the time period displayed by one frame of display picture is 12. Figure 5 The description is made by taking as an example that the number of display time periods in the time period of displaying one frame of display picture is 12 and the number of non-display time periods in the time period of displaying one frame of display picture is 13.

[0121] In an exemplary embodiment, since the display phase of the time period in which a frame of display screen is displayed is divided into multiple display time periods, the non-display phase is divided into multiple non-display time periods, and multiple display time periods are separated by non-display time periods, that is, the vertical synchronization signal is repeatedly reduced from the fourth level to the third level. The falling edge of the vertical synchronization signal means that the second driver chip must obtain backlight data from the memory and generate a backlight drive signal. Adjacent falling edges obtain backlight data from different memories. Therefore, when the number of display time periods Display-Time in the time period in which a frame of display screen is displayed is multiple, the first memory and the second memory both store the backlight data corresponding to the current frame of display screen to ensure the smoothness of the display.

[0122] In an exemplary embodiment, Figure 4 The explanation is taken as an example that the first non-display time period is the uplink signal transmission time period Uplink-Time, the second non-display time period, the third non-display time period, the fifth non-display time period, the sixth non-display time period, the eighth non-display time period and the ninth non-display time period are the peripheral electrical component touch time period Pen-Time, the fourth non-display time period is the noise detection time period Noise Detect-Time, the seventh non-display time period, the tenth non-display time period and the eleventh non-display time period are the biological limb touch time period Finger-Time, and the twelfth non-display time period is the reserved time period Reserved-Time. Figure 5The first non-display time period includes: the uplink signal transmission time period Uplink-Time and the reserved time period Reserved-Time, the second non-display time period, the third non-display time period, the fifth non-display time period, the sixth non-display time period, the eighth non-display time period and the ninth non-display time period are the peripheral electrical component touch time period Pen-Time, the fourth non-display time period is the noise detection time period Noise Detect-Time, the seventh non-display time period, the tenth non-display time period and the eleventh non-display time period are the biological limb touch time period Finger-Time, the twelfth non-display time period is the idle time period Dummy-Time, and the thirteenth non-display time period is the reserved time period Reserved-Time.

[0123] In an exemplary embodiment, the duration of a time period during which one frame of display picture is displayed may be 11 milliseconds to 12 microseconds. Exemplarily, the duration of a time period during which one frame of display picture is displayed may be 11.11 milliseconds.

[0124] In an exemplary embodiment, when the number of display time periods is plural, the lengths of at least two display time periods may be the same.

[0125] In an exemplary embodiment, the duration of any non-display time period may be 255 microseconds to 300 microseconds, for example, 258 microseconds. For example, the duration of the uplink signal transmission time period Uplink-Time may be 258 microseconds, the duration of the peripheral electrical element touch time period Pen-Time may be 258 microseconds, the duration of the biological limb touch time period Finger-Time may be 258 microseconds, the duration of the noise detection time period Noise Detect-Time may be 258 microseconds, the duration of the reserved time period Reserved-Time may be 258 microseconds, and the duration of the idle time period Dummy-Time may be 258 microseconds.

[0126] In an exemplary embodiment, in a state where the transmission time of the backlight data corresponding to the current frame display picture is less than the duration of any non-display time period, the timing controller is further configured to transmit the backlight data corresponding to the current frame display picture to one of the first memory and the second memory during the first non-display time period, and to transmit the backlight data corresponding to the current frame display picture to the other of the first memory and the second memory during the second non-display time period. Exemplarily, the timing controller transmits the backlight data corresponding to the current frame display picture to the first memory during the first non-display time period, and transmits the backlight data corresponding to the current frame display picture to the second memory during the second non-display time period.

[0127] In an exemplary embodiment, when the refresh rate of the touch display module is high, the display time of a frame display picture is short, which will cause the transmission time of the backlight data corresponding to the current frame display picture to be greater than the duration of any non-display time period. In the state where the transmission time of the backlight data corresponding to the current frame display picture is greater than the duration of any non-display time period, the timing controller is configured to divide the backlight data corresponding to the current frame display picture into the first backlight data to the Nth backlight data, and send the nth backlight data to one of the first memory and the second memory in the 2n-1th non-display time period, and send the nth backlight data to the other memory in the first memory and the second memory in the 2nth non-display time period, 1≤n≤N, N is a positive integer greater than or equal to 2. For example, taking N=3 as an example, the timing controller sends the first backlight data to the first memory in the first non-display time period, sends the first backlight data to the second memory in the second non-display time period, sends the second backlight data to the first memory in the third non-display time period, sends the second backlight data to the second memory in the fourth non-display time period, sends the third backlight data to the first memory in the fifth non-display time period, and sends the third backlight data to the second memory in the sixth non-display time period.

[0128] In an exemplary embodiment, the second driving chip is configured to generate a backlight driving signal after the timing controller completes sending the backlight data corresponding to the current frame display picture.

[0129] In an exemplary embodiment, the second driver chip is configured to generate a backlight drive signal according to the backlight data in one of the first memory or the second memory in a non-display time period after the timing controller completes sending the backlight data corresponding to the current frame display image, and to generate a backlight drive signal according to the backlight data in the other of the first memory or the second memory in the next non-display time period.

[0130] Figure 6 FIG. 1 is a schematic diagram of a touch display driving circuit provided by an exemplary embodiment. Figure 6 As shown, the second driver chip 120 includes: a plurality of input pins, a plurality of first power pins, a plurality of second power pins, a plurality of selection output pins MUX1 to MUXM and a plurality of channel pins CH1 to CHN. In an exemplary embodiment, Figure 6 The description is given below by taking M=8 and N=72 as an example.

[0131] In an exemplary embodiment, the second driver chip includes: a data selector. The data selector has an input terminal and multiple output terminals, and can output the signal received by the input terminal from different output terminals in a time-sharing manner. The multiple output terminals in the data selector correspond one-to-one to the multiple selection output pins in the second driver chip, and the signal of the output terminal is output through the corresponding selection output pin.

[0132] In an exemplary embodiment, each light-emitting area forms a current loop with the second driving chip. Each light-emitting area is electrically connected to one of the selection output pins and one of the channel pins, wherein the selection output pin connected to the light-emitting area serves as the input of the light-emitting area, and the channel pin connected to the light-emitting area serves as the output of the light-emitting area.

[0133] In an exemplary embodiment, if Figure 6 As shown, the timing controller includes: a timing control circuit 131 , a boost circuit 132 and a buck circuit 133 .

[0134] In an exemplary embodiment, if Figure 6 As shown, the input pins include: vertical synchronization pin vsync, enable pin EN, debug pin INT, and serial peripheral interface pins. Among them, the serial peripheral interface pins include: synchronization clock pin SCK, chip select pin CSB, serial peripheral interface input pin MOSI and serial peripheral interface output pin MISO.

[0135] In an exemplary embodiment, if Figure 6 As shown, the first power pins include: a backlight power supply pin PVDD, a backlight ground pin PGND, a feedback pin DFB and a feedback ground pin SGND.

[0136] In an exemplary embodiment, if Figure 6 As shown, the second power supply pin includes: an analog power supply pin AVDD and an analog ground pin AGND.

[0137] like Figure 6 As shown, the timing control circuit 131 is electrically connected to multiple input pins, the boost circuit 132 is electrically connected to multiple first power pins, the buck circuit 133 is electrically connected to multiple second power pins, and the backlight panel is electrically connected to multiple selection output pins and multiple channel pins respectively.

[0138] In an exemplary embodiment, the voltage value of the signal output by the boost circuit is approximately 10 volts to 15 volts. Exemplarily, the voltage value of the signal output by the boost circuit may be 12 volts.

[0139] In an exemplary embodiment, the voltage value of the signal output by the step-down circuit is about 1 volt to 5 volts. Exemplarily, the voltage value of the signal output by the boost circuit may be 2.8 volts.

[0140] In an exemplary embodiment, the vertical synchronization pin vsync is a pin that transmits a vertical synchronization signal.

[0141] In an exemplary embodiment, the enable pin EN is a pin for controlling the working time of the second driving chip. When the signal transmitted by the enable signal EN is a high level signal, the second driving chip works normally.

[0142] In an exemplary embodiment, the debugging pin INT is a pin for detecting whether a short circuit exists in the backlight panel.

[0143] In an exemplary embodiment, the SPI pins are pins for transmitting backlight data.

[0144] In an exemplary embodiment, the backlight power supply pin PVDD is a pin for supplying power to a backlight panel.

[0145] In an exemplary embodiment, the backlight ground pin PGND is a ground pin corresponding to a signal transmitted by the backlight power supply pin PVDD.

[0146] In an exemplary embodiment, the feedback pin DFB is a pin for adjusting a voltage value of a signal transmitted from the backlight power supply pin PVDD by detecting a current flowing through the light emitting device in the backlight panel.

[0147] In an exemplary embodiment, the feedback ground pin SGND is a ground pin corresponding to the signal transmitted by the feedback pin DFB.

[0148] In an exemplary embodiment, the analog power supply pin AVDD is a pin for supplying power to a device of the second driving chip that processes an analog signal.

[0149] In an exemplary embodiment, the analog ground pin AGND is a ground pin corresponding to a signal transmitted by the analog power supply pin AVDD.

[0150] In an exemplary embodiment, Figure 6 As shown, the second driving chip may further include: a filter pin CPLL, a digital power supply pin DVDD and a resistance setting pin ISET.

[0151] In an exemplary embodiment, the filter pin CPLL may be a pin that reduces noise of a signal of an analog power supply pin.

[0152] In an exemplary embodiment, the digital power supply pin DVDD may be a pin for supplying power to a device of the second driving chip that processes a digital signal.

[0153] In an exemplary embodiment, the resistance setting pin ISET may be a pin for setting the ground resistance of the second driving chip, and a signal of ISET may set a maximum current that can flow through the light emitting device in the backlight panel.

[0154] In an exemplary embodiment, the filter pin CPLL, the digital power supply pin DVDD, and the resistance setting pin ISET are electrically connected to the first ground terminal, respectively.

[0155] In an exemplary embodiment, the first ground terminal connected to the filter pin CPLL, the digital power supply pin DVDD, and the resistance setting pin ISET in the second driver chip and the second ground terminal connected to the first driver chip can be the same ground terminal, or can be different ground terminals. When the first ground terminal connected to the filter pin CPLL, the digital power supply pin DVDD, and the resistance setting pin ISET in the second driver chip and the second ground terminal connected to the first driver chip are different ground terminals, the common ground interference in the touch display driving circuit can be reduced.

[0156] In an exemplary embodiment, when the first ground terminal connected to the filter pin CPLL, the digital power supply pin DVDD and the resistance setting pin ISET in the second driver chip and the second ground terminal connected to the first driver chip are the same ground terminal, the greater the voltage value of the backlight driving signal provided by the second driver chip to the backlight panel, the greater the interference noise on the touch performance of the touch display module.

[0157] In an exemplary embodiment, the timing control circuit is also respectively configured with the boost circuit and the buck circuit to provide a first power signal to the boost circuit, a second power signal to the buck circuit, and a third power signal and an image data signal to the touch display module.

[0158] In an exemplary embodiment, the third power signal may be a negative voltage signal and a negative power signal. The absolute value of the third power signal may be approximately 1 volt to 3 volts. Exemplarily, the absolute value of the third power signal may be 1.8 volts.

[0159] In an exemplary embodiment, the image data signal may be transmitted according to a physical layer (D-Physical for short) protocol in a Mobile Industry Processor Interface (MIPI for short) protocol.

[0160] Figure 7 FIG. 1 is a schematic diagram showing the connection between the timing control circuit and the serial peripheral interface pins of the second driver chips. Figure 7As shown, in an exemplary embodiment, when there are multiple second driver chips, the serial peripheral interface pins of the multiple second driver chips are cascaded with each other, and the serial peripheral interface output pin MISO of the i-th second driver chip is connected to the serial peripheral interface input pin MOSI of the i+1-th second driver chip.

[0161] In an exemplary embodiment, if Figure 7 As shown, the timing control circuit 131 is electrically connected to the synchronous clock pin SCK and the chip selection pin CSB of any second driver chip, the serial peripheral interface input pin MOSI of the first second driver chip and the serial peripheral interface output pin MISO of the last second driver chip.

[0162] Figure 8 FIG. 1 is a schematic diagram of the structure of a touch display device provided in an embodiment of the present disclosure. Figure 8 As shown, the touch display device provided by the embodiment of the present disclosure may include: a backlight panel 200 , a touch display module 300 and a touch display driving circuit. The touch display driving circuit includes: at least one first driving chip 110 , at least one second driving chip 120 and a timing controller 130 . Figure 8 The description is made by taking the touch display driving circuit including two first driving chips 110 and three second driving chips 120 as an example.

[0163] The touch display driving circuit is the touch display driving circuit provided by any of the aforementioned embodiments, and the implementation principle and implementation effect are similar, which will not be described in detail here.

[0164] In an exemplary embodiment, if Figure 8 As shown, the first driving chip 110 may be disposed on the touch display module 300 or may be disposed on a side of the backlight panel away from the touch display module.

[0165] In an exemplary embodiment, the second driving chip and the timing controller are disposed on a side of the backlight panel away from the touch display module.

[0166] In an exemplary embodiment, if Figure 8 As shown, the touch display device may further include: at least one printed circuit board 400 , the printed circuit board 400 and the second driving chip 120 are in a one-to-one correspondence, and the second driving chip 120 is electrically connected to the backlight panel 200 through the corresponding printed circuit board 400 .

[0167] Fig. 9 A schematic diagram of the connection between the second driving chip and the backlight panel provided in an exemplary embodiment, Fig.10 A schematic diagram of the connection of a backlight panel provided for an exemplary embodiment. In an exemplary embodiment, as Fig. 9 and Fig.10As shown, the backlight panel 200 includes: a plurality of light-emitting areas L, at least one of which includes: at least one light-emitting device. The light-emitting device may be a micro inorganic light-emitting diode.

[0168] In an exemplary embodiment, if Fig. 9 and Fig.10 As shown, a plurality of light emitting regions may be arranged in an array.

[0169] In an exemplary embodiment, a plurality of light emitting devices located in the same light emitting region may be arranged in a row direction, or may be arranged in a column direction, or may be arranged in an array.

[0170] In an exemplary embodiment, if Fig. 9 and Fig.10 As shown, at least one second control chip 120 is electrically connected to a plurality of light-emitting areas. Fig. 9 The following is an example in which M=8, N=72, and one light-emitting area includes one micro inorganic light-emitting diode. Fig.10 The description is made by taking M=8, N=36, and one light-emitting area including a plurality of micro inorganic light-emitting diodes as an example.

[0171] In an exemplary embodiment, if Fig. 9 As shown, the light-emitting area includes: M rows and N columns of light-emitting areas. The light-emitting area located in the mth row is electrically connected to the mth selection output pin MUXm, for example, the light-emitting area located in the first row is electrically connected to the first selection output pin MUX1, the light-emitting area located in the second row is electrically connected to the second selection output pin MUX2, and so on. The light-emitting area located in the nth column is electrically connected to the nth channel pin, for example, the light-emitting area in the first column is electrically connected to the first channel pin CH1, and the light-emitting area in the second column is electrically connected to the second channel pin CH2, 1≤m≤M, 1≤n≤N.

[0172] In an exemplary embodiment, if Fig.10 As shown, the light-emitting area includes: 3M rows and N / 3 columns of light-emitting areas. The light-emitting areas located in the 3m-2th row to the 3mth row are electrically connected to the mth selection output pin MUXm. For example, the light-emitting areas located in the first to third rows are electrically connected to the first selection output pin MUX1, and the light-emitting areas located in the fourth to sixth rows are electrically connected to the second selection output pin MUX2, and so on. The light-emitting area located in the 3m-2th row and the kth column is electrically connected to the 3k-2th channel pin, the light-emitting area located in the 3m-1th row and the kth column is electrically connected to the 3k-1th channel pin, and the light-emitting area located in the 3mth row and the kth column is electrically connected to 3k channel pins. For example, the light-emitting area located in the first row and the first column is electrically connected to the first channel pin CH1, the light-emitting area located in the first row and the second column is electrically connected to the fourth channel pin CH4, and the light-emitting area located in the first row and the third column is electrically connected to the seventh channel pin CH7, and so on. The present disclosure does not make any limitation to this.

[0173] Fig.11 The timing diagram for multiple selection output pin signals and multiple channel pin signals. Fig.11 As shown, in an exemplary embodiment, output times of signals of any two selection output pins among the plurality of selection output pins do not overlap, and output times of signals of any two channel pins among the plurality of channel pins do not overlap. Fig.11 The following is an example of M=8 and N=72. Fig.11 As shown, the time when the plurality of selection output pins output signals is within the time when the vertical synchronization signal is at the third level.

[0174] like Fig.11 As shown, in an exemplary embodiment, the output time of a signal of any channel pin overlaps with the output time of a signal of any selection output pin, and the output time of a signal of any selection output pin is greater than or equal to the sum of the output times of signals of multiple channel pins.

[0175] In an exemplary embodiment, the touch display driving circuit is configured to drive the display of multiple frames of display images, and the time period for displaying a frame of display images includes: a display time period and a non-display time period. The touch display module includes: a plurality of gate lines, a plurality of first touch signal lines, a plurality of second touch signal lines, and a gate driving circuit. Among them, the gate driving circuit is electrically connected to the first driving chip and the plurality of gate lines, respectively, and is configured to send gate driving signals to the plurality of gate lines in sequence during the display time period under the control of the clock signal and the touch enable signal sent by the first driving chip. The first driving chip is electrically connected to the plurality of first touch signal lines and the plurality of second touch signal lines, and is configured to send touch driving signals to the plurality of first touch signal lines in sequence during part of the non-display time period, and to receive touch sensing signals sent by the plurality of second touch signal lines in sequence.

[0176] The present disclosure also provides a control method for a touch display driving circuit, which is configured to control the touch display driving circuit. The control method for the touch display driving circuit may include the following steps:

[0177] Step S1, the timing controller sends a vertical synchronization signal to the second driving chip;

[0178] Step S2, the first driver chip sends a touch enable signal to the timing controller, and the first driver chip also sends a touch drive signal to the touch display module when the touch enable signal is at a first level, and receives a touch sensing signal sent by the touch display module, and stops sending the touch drive signal to the touch display module when the touch enable signal is at a second level;

[0179] Step S3: the second driver chip generates a backlight driving signal. The second driver chip also sends the backlight driving signal to the backlight panel when the vertical synchronization signal is at the third level, and stops sending the backlight driving signal to the backlight panel when the vertical synchronization signal is at the fourth level.

[0180] In an exemplary embodiment, the control method of the touch display driving circuit may further include: when the vertical synchronization signal is in a fourth level, the timing controller sends backlight data to the second driving chip, the backlight data including: the brightness value of the backlight panel; the second driving chip generates a backlight driving signal including: the second driving chip generates a backlight driving signal according to the backlight data.

[0181] The drawings in the present disclosure only relate to the structures involved in the embodiments of the present disclosure, and other structures may refer to the general design.

[0182] For the sake of clarity, in the drawings used to describe the embodiments of the present disclosure, the thickness and size of the layer or microstructure are exaggerated. It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "under" another element, the element may be "directly" "on" or "under" the other element, or there may be intermediate elements.

[0183] Although the embodiments disclosed in the present disclosure are as above, the contents described are only embodiments adopted to facilitate understanding of the present disclosure and are not intended to limit the present disclosure. Any technician in the field to which the present disclosure belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in the present disclosure, but the scope of patent protection of the present disclosure shall still be subject to the scope defined in the attached claims.

Claims

1. A touch display driving circuit, electrically connected to a backlight panel and a touch display module, characterized in that: The touch display driving circuit comprises: at least one first driving chip, at least one second driving chip and a timing controller; The first driver chip is electrically connected to the timing controller and the touch display module, respectively, and is configured to send a touch enable signal to the timing controller, and is also configured to send a touch drive signal to the touch display module when the touch enable signal is at a first level, and receive a touch sensing signal sent by the touch display module, and stop sending a touch drive signal to the touch display module when the touch enable signal is at a second level; The timing controller is electrically connected to the second driving chip and is configured to send a vertical synchronization signal to the second driving chip; The second driving chip is configured to generate a backlight driving signal, and is further configured to send the backlight driving signal to the backlight panel when the vertical synchronization signal is at a third level, and stop sending the backlight driving signal to the backlight panel when the vertical synchronization signal is at a fourth level; The start time of the touch enable signal in any first level state is the same as the start time of the vertical synchronization signal in any fourth level state, and the end time of the touch enable signal in any first level state is the same as the end time of the vertical synchronization signal in any fourth level state.

2. The touch display driving circuit according to claim 1, characterized in that: The start time of the touch enable signal in any second level state is the same as the start time of the vertical synchronization signal in any third level state, and the end time of the touch enable signal in any second level state is the same as the end time of the vertical synchronization signal in any third level state.

3. The touch display driving circuit according to claim 1 or 2, characterized in that: The absolute value of the first level is greater than or less than the absolute value of the second level; An absolute value of the third level is smaller than an absolute value of the fourth level.

4. The touch display driving circuit according to claim 3, characterized in that: The timing controller is further configured to send backlight data to the second driving chip when the vertical synchronization signal is at a fourth level, the backlight data comprising: a brightness value of a backlight panel; The second driving chip is further configured to generate a backlight driving signal according to the backlight data.

5. The touch display driving circuit according to claim 4, characterized in that: The second driving chip includes: a first memory and a second memory; The first memory and the second memory are configured to store the backlight data.

6. The touch display driving circuit according to claim 5, characterized in that: The touch display driving circuit is configured to drive a plurality of display frames to display, and a time period for displaying a frame of display includes: a display time period and a non-display time period; The touch enable signal is at the second level in the display time period and at the first level in the non-display time period. The vertical synchronization signal is at the third level in the display time period and at the fourth level in the non-display time period.

7. The touch display driving circuit according to claim 6, characterized in that: The non-display time period includes: at least one of: a time period for transmitting uplink signals, a time period for touching an external electrical component, a time period for touching a biological limb, an idle time period, a noise detection time period and a reserved time period; the uplink signal includes: a handshake signal for interaction between the first driver chip and the external electrical component, and the reserved time period is a time period for internal operations of the first driver chip and for some signals of the first driver chip and the timing controller.

8. The touch display driving circuit according to claim 7, characterized in that: When the number of display time periods in the time period of displaying a frame of display picture is one, the number of non-display time periods is two, the display time period is located between the two non-display time periods, and the first non-display time period occurs before the display time period; The first non-display time period includes: an uplink signal transmission time period, and the second non-display time period includes: at least one of: an external electrical element touch time period, a biological limb touch time period, an idle time period, a noise detection time period, and a reserved time period; The first memory stores backlight data corresponding to a current frame display picture, and the second memory stores backlight data corresponding to a next frame display picture.

9. The touch display driving circuit according to claim 7, characterized in that: When the number of display time periods in the time period of displaying a frame of display picture is multiple, the number of non-display time periods is multiple, and the display time periods and the non-display time periods occur alternately; The first non-display time period occurs before the first display time period, and the first non-display time period includes: a time period for transmitting an uplink signal, and any non-display time period other than the first non-display time period includes: at least one of: a peripheral electrical component touch time period, a biological limb touch time period, an idle time period, a noise detection time period, and a reserved time period; The first memory and the second memory both store backlight data corresponding to the current frame display picture.

10. The touch display driving circuit according to claim 9, characterized in that: In a state where the transmission time of the backlight data corresponding to the current frame display image is less than the duration of any non-display time period, the timing controller is also configured to transmit the backlight data corresponding to the current frame display image to one of the first memory and the second memory during the first non-display time period, and to transmit the backlight data corresponding to the current frame display image to the other of the first memory and the second memory during the second non-display time period.

11. The touch display driving circuit according to claim 9, characterized in that: In a state where the transmission time of the backlight data corresponding to the current frame display picture is greater than the duration of any non-display time period, the timing controller is configured to divide the backlight data corresponding to the current frame display picture into the first backlight data to the Nth backlight data, and send the nth backlight data to one of the first memory and the second memory in the nth non-display time period, and send the nth backlight data to the other of the first memory and the second memory in the 2nth non-display time period, 1≤n≤N, and N is a positive integer greater than or equal to 2; The second driving chip is configured to generate a backlight driving signal after the timing controller completes sending the backlight data corresponding to the current frame display picture.

12. The touch display driving circuit according to any one of claims 8 to 11, characterized in that: The second driver chip is configured to generate a backlight drive signal according to the backlight data in one of the first memory or the second memory in a non-display time period after the timing controller completes sending the backlight data corresponding to the current frame display image, and to generate a backlight drive signal according to the backlight data in the other of the first memory or the second memory in the next non-display time period.

13. The touch display driving circuit according to any one of claims 1 to 4, characterized in that: The second driving chip includes: a plurality of input pins, a plurality of first power pins, a plurality of second power pins, a plurality of selection output pins and a plurality of channel pins, and the timing controller includes: a timing control circuit, a boost circuit and a buck circuit; The timing control circuit is electrically connected to a plurality of input pins, the boost circuit is electrically connected to a plurality of first power pins, the buck circuit is electrically connected to a plurality of second power pins, and the backlight panel is electrically connected to a plurality of selection output pins and a plurality of channel pins respectively; The input pins include: a vertical synchronization pin, an enable pin, a debug pin, and a serial peripheral interface pin; the first power pins include: a backlight power pin, a backlight ground pin, a feedback pin, and a feedback ground pin; the second power pins include: an analog power pin and an analog ground pin; The vertical synchronization pin is configured to transmit the vertical synchronization signal, and the serial peripheral interface pin is configured to transmit the backlight data.

14. The touch display driving circuit according to claim 13, characterized in that: The first driving chip is further configured to send a tearing effect signal to the timing controller and provide a clock signal and a touch enable signal to the touch display module, wherein the tearing effect signal includes: a start signal and an end signal of a frame of display image; The timing control circuit is also respectively configured with the boost circuit and the buck circuit to provide a first power signal to the boost circuit, a second power signal to the buck circuit, and a third power signal and an image data signal to the touch display module.

15. A touch display device, characterized in that: include: A backlight panel, a touch display module, and a touch display driving circuit as claimed in any one of claims 1 to 14.

16. The touch display device according to claim 15, characterized in that: The backlight panel comprises: a plurality of light-emitting areas, at least one of which comprises: a plurality of light-emitting devices, and the light-emitting devices comprise: micro inorganic light-emitting diodes; At least one second control chip is electrically connected to a plurality of light-emitting regions, and the light-emitting regions are electrically connected to one of the selection output pins and one of the channel pins.

17. The touch display device according to claim 16, characterized in that: The output time of signals of any two selection output pins among the multiple selection output pins does not overlap, and the output time of signals of any two channel pins among the multiple channel pins does not overlap. The output time of a signal of any channel pin overlaps with the output time of a signal of any selection output pin, and the output time of a signal of any selection output pin is greater than or equal to the sum of the output times of signals of multiple channel pins.

18. The device according to claim 16, characterized in that The touch display driving circuit is configured to drive a plurality of display frames to display, and a time period for displaying a frame of display includes: a display time period and a non-display time period; The touch display module comprises: a plurality of gate lines, a plurality of first touch signal lines, a plurality of second touch signal lines and a gate drive circuit; The gate driving circuit is electrically connected to the first driving chip and the plurality of gate lines respectively, and is configured to send gate driving signals to the plurality of gate lines in sequence during a display time period under the control of a clock signal and a touch enable signal sent by the first driving chip; The first driver chip is electrically connected to multiple first touch signal lines and multiple second touch signal lines, and is configured to sequentially send touch drive signals to the multiple first touch signal lines in a partial non-display time period, and sequentially receive touch sensing signals sent by the multiple second touch signal lines.

19. The device according to claim 16, characterized in that The touch display module comprises: a display side and a non-display side, the backlight panel is located on the non-display side of the touch display module, and the touch display driving circuit comprises: at least one first driving chip, at least one second driving chip and a timing controller; The first driving chip is arranged on the touch display module, and the second driving chip and the timing controller are arranged on a side of the backlight panel away from the touch display module.

20. The device according to claim 15, characterized in that Also includes: At least one printed circuit board, the printed circuit board and the second driving chip are in a one-to-one correspondence, and the second driving chip is electrically connected to the backlight panel through the corresponding printed circuit board.

21. A control method for a touch display driving circuit, characterized in that: The method is configured to control the touch display driving circuit according to any one of claims 1 to 14, and the method comprises: The timing controller sends a vertical synchronization signal to the second driving chip; The first driver chip sends a touch enable signal to the timing controller. When the touch enable signal is at a first level, the first driver chip sends a touch drive signal to the touch display module and receives a touch sensing signal sent by the touch display module. When the touch enable signal is at a second level, the first driver chip stops sending the touch drive signal to the touch display module. The second driver chip generates a backlight driving signal, and the second driver chip also sends the backlight driving signal to the backlight panel when the vertical synchronization signal is at a third level, and stops sending the backlight driving signal to the backlight panel when the vertical synchronization signal is at a fourth level. The method further includes: the timing controller sends backlight data to the second driving chip when the vertical synchronization signal is at a fourth level, the backlight data including: a brightness value of the backlight panel; The second driving chip generating the backlight driving signal includes: the second driving chip generating the backlight driving signal according to the backlight data.

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