Embedded display driving circuit and method

Abstract

The present invention discloses an embedded display driver circuit and method. The second level input terminal STV is used to input a high-level start signal to the input module during the display scan phase to activate the input module. The first level input terminal CK and the third level input terminal EN are used to sequentially input high-level signals to the output module through the input module during the display scan phase until the output module completely outputs high-level signals and completes the output of high-level row gate signals. The second pull-down module is used to activate in response to a high-level signal from the fourth level input terminal GLV during the touch scan phase, allowing the low-level signal from the seventh level input terminal VGL to be input to the second terminal of the output module through the second pull-down module. The present invention reduces the level of the input terminal voltage holding point P during the touch scan phase, thereby preventing the main transistor threshold voltage Vth from drifting and the occurrence of horizontal streaks on the display.

Description

Technical Field

[0001] The present invention relates to the technical field of touch display screen scanning, and in particular to an embedded display driving circuit and method. Background Art

[0002] With the development of integrated touch-display technology, the common electrodes of the touch-sensitive display panel can also serve as touch-sensing electrodes for touch detection. By driving the touch and display in a time-sharing manner, touch and display functions can be realized simultaneously. Integrating the touch-sensing electrodes directly into the display panel significantly reduces production costs, improves production efficiency, and reduces panel thickness.

[0003] In-cell (TDDI, short for Touch and Display Driver Integration) displays are widely used in mobile electronic devices. Existing in-cell display devices typically have vertical and horizontal synchronous scanning modes. The horizontal synchronous scanning mode allows for flexible adjustment of the touch detection frequency without changing the display refresh rate. Within a single frame, the display scan is performed first, followed by a touch scan, then a display scan, and finally a touch scan, repeating this display and touch cycle multiple times. However, because this method switches between display and touch multiple times within a single frame, it places significant pressure on the gate input of the main driver transistor, causing the transistor's threshold voltage (Vth) to drift. When the touch scan phase ends and the display scan phase begins, the clock level signal passes through the main driver transistor, resulting in insufficient Gout output driving force, exhibiting abnormalities such as horizontal streaks on the display.

[0004] Chinese patent application CN 113870808 A discloses a timing control method, a timing controller, a storage medium, and a computer device. By buffering a frame of display data within the timing controller, the method outputs a first drive signal and a second drive signal within the refresh time of a frame of display data, thereby achieving reverse scanning of odd and even rows of a display panel. This solution is not suitable for scanning modes that alternate between display scanning phases and touch scanning phases. Summary of the Invention

[0005] Existing embedded displays switch between display and touch multiple times within a frame, which puts greater pressure on the gate input of the main driver transistor, causing the transistor's threshold voltage Vth to drift. When the touch scanning phase ends and the display scanning phase begins, the clock level signal passes through the main driver transistor, resulting in insufficient Gout output driving force, which in turn leads to the appearance of horizontal stripes.

[0006] To address the above problems, an embedded display driving circuit and method are proposed. By implementing the designed driving circuit, a second pull-down module is used to respond to a high-level signal from the fourth level input terminal during the touch scanning phase and then turn on, so that a low-level signal from the seventh level input terminal is input to the second terminal of the output module through the second pull-down module; and a first pull-down module is used to respond to high-level signals from the fifth level input terminal, the sixth level input terminal, and the first level input terminal and then turn on, so that a low-level signal from the seventh level input terminal is input to the first terminal of the output module through the first pull-down module. This prevents the input terminal voltage of the output module from being at a high level for a long time, causing the threshold voltage Vth of the main transistor to drift. When entering the display phase, insufficient Gout output driving force occurs, resulting in abnormal phenomena such as display stripes.

[0007] In a first aspect, an embedded display driving circuit includes:

[0008] a first level input terminal, a second level input terminal, a third level input terminal, a fourth level input terminal, a fifth level input terminal, a sixth level input terminal, a seventh level input terminal, and a driving circuit output terminal;

[0009] Input module;

[0010] First drop-down module;

[0011] Second drop-down module;

[0012] The first level input terminal, the second level input terminal, and the third level input terminal are connected to the first terminal, the second terminal, and the third terminal of the input module;

[0013] The fourth end, the fifth end, and the sixth end of the input module are connected to the third end of the output module, the second end of the second pull-down module, and the fifth end of the first pull-down module respectively;

[0014] The first end, the third end, and the fourth end of the second pull-down module are respectively connected to the fourth level input end, the second end of the output module, and the fourth end of the first pull-down module;

[0015] The first end, the second end, and the third end of the first pull-down module are connected to the fifth level input end, the sixth level input end, and the seventh level input end respectively;

[0016] The sixth end of the first pull-down module is connected to the first end of the output module;

[0017] The fourth end of the output module is connected to the output end of the driving circuit;

[0018] The second level input terminal is used to input a high level start signal to the input module during the display scanning phase to start the input module;

[0019] The first level input terminal and the third level input terminal are used to input high level signals to the output module in sequence through the input module during the display scanning phase, until the output module completely outputs the high level signal and completes the output of the row gate high level signal;

[0020] The second pull-down module is configured to be turned on in response to a high-level signal at the fourth level input terminal during a touch scanning phase, so that a low-level signal at the seventh level input terminal is input to the second terminal of the output module through the second pull-down module;

[0021] The first pull-down module is used to respond to the high-level signals of the fifth level input terminal, the sixth level input terminal, and the first level input terminal during the display scanning phase and then turn on, so that the low-level signal of the seventh level input terminal is input to the first end of the output module through the first pull-down module.

[0022] In conjunction with the embedded display driving circuit of the present invention, in a first possible implementation manner, the input module includes:

[0023] a first input unit;

[0024] Second input unit;

[0025] a first pull-down unit;

[0026] The first input unit is configured to start up after responding to a high level signal input from the second level input terminal during a display scanning phase, and transmit the high level signal to the second input unit;

[0027] The second input unit is configured to start up after responding to the high level signal during the display scanning phase, so that the high level signal at the third level input terminal is transmitted to the output module;

[0028] The first pull-down unit is configured to start up in response to a high level signal at the first level input terminal during a display scanning phase, so that a low level signal at the fourth level input terminal is transmitted to the second input unit to turn off the second input unit.

[0029] In combination with the first possible implementation manner of the present invention, in a second possible implementation manner, the first pull-down module includes:

[0030] A second pull-down unit, a third pull-down unit, a fourth pull-down unit, and a fifth pull-down unit;

[0031] The second pull-down unit and the third pull-down unit are configured to be activated in response to a high level signal input from the fifth level input terminal during the display phase, so that point A is at a high level;

[0032] The fourth pull-down unit and the fifth pull-down unit are used to start after responding to the high-level signal at point A in the display phase, so that the low-level signal at the seventh-level input terminal reaches point P through the fourth pull-down unit, and the low-level signal at the seventh-level input terminal reaches the output terminal of the driving circuit through the fifth pull-down unit.

[0033] In combination with the second possible implementation manner of the present invention, in a third possible implementation manner, the first pull-down module further includes:

[0034] the sixth pull-down unit;

[0035] The sixth pull-down unit is configured to start in response to a high-level signal inputted from the sixth level input terminal, so that a low-level signal inputted from the seventh level input terminal is transmitted to the point P to pull down the level of the point P.

[0036] In combination with the third possible implementation manner of the present invention, in a fourth possible implementation manner, the first pull-down module further includes:

[0037] seventh pull-down unit;

[0038] eighth pull-down unit;

[0039] The seventh pull-down unit and the eighth pull-down unit are used to respond to the high-level signal at point P in the display phase, so that the low-level signal at the seventh level input terminal is transmitted to point P to lower the level of point P.

[0040] In combination with the fourth possible implementation manner of the present invention, in a fifth possible implementation manner, the input module further includes:

[0041] a first filtering unit;

[0042] The first filtering unit is used to filter the high-level signal output by the first input unit.

[0043] In combination with the fifth possible implementation manner of the present invention, in a sixth possible implementation manner, the output module includes:

[0044] a second filtering unit;

[0045] Output unit;

[0046] The second filtering unit is used to filter the high-level signal output from point P to the output end of the driving circuit;

[0047] The output unit is configured to start in response to a high-level signal at point P during a display scanning phase, so that the high-level signal outputted from the third level output terminal is outputted to the output terminal of the driving circuit.

[0048] In combination with the sixth possible implementation manner of the present invention, in a seventh possible implementation manner, the first pull-down unit, the first input unit, the second input unit, the second pull-down module, the second pull-down unit, the third pull-down unit, the fourth pull-down unit, the fifth pull-down unit, the sixth pull-down unit, the seventh pull-down unit, the eighth pull-down unit, and the output unit are respectively:

[0049] a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a seventh transistor, an eighth transistor, a ninth transistor, a tenth transistor, an eleventh transistor, and a twelfth transistor;

[0050] The first filtering unit and the second filtering unit are respectively:

[0051] a first capacitor and a second capacitor;

[0052] The gate of the first transistor is commonly connected to the first level input terminal and the source of the twelfth transistor;

[0053] The source of the first transistor is commonly connected to the fourth level input terminal and the gate of the fourth transistor;

[0054] The drain of the first transistor is commonly connected to the drain of the second transistor, the gate of the third transistor, and the first end of the first capacitor;

[0055] The gate of the second transistor, the source of the second transistor, and the second level input terminal are connected in common;

[0056] The source of the third transistor is connected to the third level input terminal;

[0057] The drain of the third transistor is commonly connected to the drain of the fourth transistor, the gate of the twelfth transistor, the drain of the ninth transistor, the gate of the tenth transistor, the gate of the eleventh transistor, the first end of the second capacitor, and the drain of the seventh transistor;

[0058] The source of the fourth transistor, the second end of the first capacitor, the source of the ninth transistor, the source of the tenth transistor, the source of the eleventh transistor, the source of the seventh transistor, the source of the eighth transistor, and the seventh level input terminal are connected in common;

[0059] The source of the fifth transistor, the gate of the fifth transistor, the source of the sixth transistor, and the fifth level input terminal are connected in common;

[0060] The sixth level input terminal is connected to the gate of the ninth transistor;

[0061] The gate of the sixth transistor is commonly connected to the drain of the fifth transistor and the drain of the tenth transistor;

[0062] The drain of the sixth transistor is commonly connected to the drain of the eleventh transistor, the gate of the seventh transistor, and the gate of the eighth transistor;

[0063] The drain of the eighth transistor is commonly connected to the second end of the second capacitor, the drain of the twelfth transistor, and the output end of the driving circuit.

[0064] In a second aspect, a method for driving an embedded display, using the driving circuit of the first aspect, includes:

[0065] Step 100: In the display scanning phase, high-level signals are sequentially input to the output module through the input module until the output module completely outputs high-level signals and completes the output of row gate high-level signals;

[0066] Step 200: Input the low-level signal of the input terminal to the first terminal of the output module through the first pull-down module;

[0067] Step 300: In the touch scanning phase, a low-level signal is input to the second end of the output module through the second pull-down module.

[0068] In combination with the driving method described in the second aspect, in a first possible implementation manner, the

[0069] Step 210: In response to the high-level signal at point A during the display phase, the fourth pull-down unit and the fifth pull-down unit are activated, so that the low-level signal at the seventh level input terminal reaches point P through the fourth pull-down unit and reaches the output terminal of the driving circuit through the fifth pull-down unit.

[0070] Step 220 : Start the sixth pull-down unit so that the low-level signal inputted from the seventh level input terminal is transmitted to the point P to pull down the level of the point P.

[0071] The embedded display driving circuit and method described in the present invention are implemented. By implementing the designed driving circuit, the second pull-down module is turned on after responding to the high-level signal of the fourth level input terminal during the touch scanning phase, so that the low-level signal of the seventh level input terminal is input to the second terminal of the output module through the second pull-down module; and the first pull-down module is turned on after responding to the high-level signals of the fifth level input terminal, the sixth level input terminal, and the first level input terminal during the display scanning phase, so that the low-level signal of the seventh level input terminal is input to the first terminal of the output module through the first pull-down module. This prevents the input terminal voltage of the output module from being at a high level for a long time, causing the threshold voltage Vth of the main transistor to drift, resulting in insufficient Gout output driving force when entering the display phase, and the appearance of abnormal phenomena such as display stripes. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0073] Figure 1 This is a first schematic diagram of the connection of the embedded display driving circuit module in the present invention;

[0074] Figure 2 This is a second schematic diagram of the connection of the embedded display driving circuit module in the present invention;

[0075] Figure 3 This is a circuit connection diagram of the embedded display driving circuit of the present invention;

[0076] Figure 4 This is a schematic diagram of the driving timing of the embedded display driving circuit in the present invention;

[0077] Figure 5 This is a first schematic diagram of the embedded display driving method of the present invention;

[0078] Figure 6 is a second schematic diagram of the embedded display driving method of the present invention;

[0079] The numbers in the accompanying drawings indicate the following parts: CK—first level input terminal, STV—second level input terminal, EN—third level input terminal, GLV—fourth level input terminal, VDD—fifth level input terminal, RST—sixth level input terminal, VGL—seventh level input terminal, Gout—drive circuit output terminal. DETAILED DESCRIPTION

[0080] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the present invention.

[0081] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0082] Existing embedded displays switch between display and touch multiple times within a frame, which puts greater pressure on the gate input of the main driver transistor, causing the transistor's threshold voltage Vth to drift. When the touch scanning phase ends and the display scanning phase begins, the clock level signal passes through the main driver transistor, resulting in insufficient Gout output driving force, which in turn leads to the appearance of horizontal stripes.

[0083] To address the above problems, an embedded display driving circuit and method are proposed.

[0084] Embodiment 1 of the embedded display driving circuit of the present invention

[0085] like Figure 1 , Figure 1 This is the first schematic diagram of the connection of the embedded display driving circuit module in the present invention, an embedded display driving circuit, including: a first level input terminal CK, a second level input terminal STV, a third level input terminal EN, a fourth level input terminal GLV, a fifth level input terminal VDD, a sixth level input terminal RST, a seventh level input terminal VGL, a driving circuit output terminal Gout, an input module, a first pull-down module, and a second pull-down module.

[0086] The first level input terminal CK, the second level input terminal STV, and the third level input terminal EN are connected to the first terminal, the second terminal, and the third terminal of the input module.

[0087] The fourth end, the fifth end, and the sixth end of the input module are respectively connected to the third end of the output module, the second end of the second pull-down module, and the fifth end of the first pull-down module.

[0088] The first end, the third end, and the fourth end of the second pull-down module are respectively connected to the fourth level input end GLV, the second end of the output module, and the fourth end of the first pull-down module.

[0089] The first end, the second end, and the third end of the first pull-down module are connected to the fifth level input end VDD, the sixth level input end RST, and the seventh level input end VGL, respectively.

[0090] The sixth end of the first pull-down module is connected to the first end of the output module.

[0091] The fourth terminal of the output module is connected to the output terminal Gout of the driving circuit.

[0092] The second level input terminal STV is used to input a high level start signal to the input module during the display scanning phase to start the input module.

[0093] The first level input terminal CK and the third level input terminal EN are used to input high level signals to the output module in sequence through the input module during the display scanning phase, until the output module completely outputs the high level signal and completes the output of the row gate high level signal.

[0094] The second pull-down module is configured to be turned on in response to a high level signal of the fourth level input terminal GLV during the touch scanning phase, so that the low level signal of the seventh level input terminal VGL is input to the second end of the output module through the second pull-down module.

[0095] The first pull-down module is used to respond to the high-level signals of the fifth level input terminal VDD, the sixth level input terminal RST, and the first level input terminal CK during the display scanning phase and turn on, so that the low-level signal of the seventh level input terminal VGL is input to the first end of the output module through the first pull-down module.

[0096] Embodiment 2 of the embedded display driving circuit of the present invention

[0097] Furthermore, if Figure 2 , Figure 2 This is a second schematic diagram of the connection of the embedded display driving circuit module in the present invention. The input module includes a first input unit, a second input unit, and a first pull-down unit.

[0098] The first input unit is used to start after responding to a high-level signal input from the second level input terminal STV during the display scanning phase, and transmit the high-level signal to the second input unit; the second input unit is used to start after responding to a high-level signal during the display scanning phase, so that the high-level signal from the third level input terminal EN is transmitted to the output module; the first pull-down unit is used to start after responding to a high-level signal from the first level input terminal CK during the display scanning phase, so that the low-level signal from the fourth level input terminal GLV is transmitted to the second input unit to turn off the second input unit.

[0099] Furthermore, the first pull-down module includes: a second pull-down unit, a third pull-down unit, a fourth pull-down unit, and a fifth pull-down unit.

[0100] The second pull-down unit and the third pull-down unit are configured to be activated in response to a high level signal input from the fifth level input terminal VDD during the display phase, so that point A is at a high level.

[0101] The fourth pull-down unit and the fifth pull-down unit are used to start after responding to the high-level signal at point A in the display phase, so that the low-level signal of the seventh-level input terminal VGL reaches point P through the fourth pull-down unit, and the low-level signal of the seventh-level input terminal VGL reaches the output terminal Gout of the driving circuit through the fifth pull-down unit.

[0102] Furthermore, the first pull-down module also includes a sixth pull-down unit; the sixth pull-down unit is used to start in response to the high-level signal input by the sixth level input terminal RST, so that the low-level signal input by the seventh level input terminal VGL is transmitted to point P to lower the level of point P.

[0103] Furthermore, the first pull-down module also includes a seventh pull-down unit and an eighth pull-down unit; the seventh pull-down unit and the eighth pull-down unit are used to respond to the high-level signal at point P during the display stage, so that the low-level signal of the seventh level input terminal VGL is transmitted to point P to lower the level of point P.

[0104] Furthermore, the input module further includes a first filtering unit;

[0105] The first filtering unit is used to filter the high-level signal output by the first input unit.

[0106] Furthermore, the output module includes a second filtering unit and an output unit; the second filtering unit is used to filter the high-level signal output from point P to the output terminal Gout of the driving circuit; the output unit is used to start in response to the high-level signal of point P during the display scanning phase, so that the high-level signal output by the third level output terminal is output to the output terminal Gout of the driving circuit.

[0107] Embodiment 3 of the embedded display driving circuit of the present invention

[0108] like Figure 3 , Figure 3 This is a circuit connection diagram of the embedded display driving circuit in the present invention. The first pull-down unit, the first input unit, the second input unit, the second pull-down module, the second pull-down unit, the third pull-down unit, the fourth pull-down unit, the fifth pull-down unit, the sixth pull-down unit, the seventh pull-down unit, the eighth pull-down unit, and the output unit are respectively: a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a seventh transistor, an eighth transistor, a ninth transistor, a tenth transistor, an eleventh transistor, and a twelfth transistor.

[0109] The first filtering unit and the second filtering unit are respectively: a first capacitor and a second capacitor.

[0110] The gate of the first transistor is connected to the first level input terminal CK and the source of the twelfth transistor;

[0111] The source of the first transistor is commonly connected to the fourth level input terminal GLV and the gate of the fourth transistor;

[0112] The drain of the first transistor is commonly connected to the drain of the second transistor, the gate of the third transistor, and the first end of the first capacitor;

[0113] The gate of the second transistor, the source of the second transistor, and the second level input terminal STV are connected in common;

[0114] The source of the third transistor is connected to the third level input terminal EN;

[0115] The drain of the third transistor is commonly connected to the drain of the fourth transistor, the gate of the twelfth transistor, the drain of the ninth transistor, the gate of the tenth transistor, the gate of the eleventh transistor, the first end of the second capacitor, and the drain of the seventh transistor;

[0116] The source of the fourth transistor, the second end of the first capacitor, the source of the ninth transistor, the source of the tenth transistor, the source of the eleventh transistor, the source of the seventh transistor, the source of the eighth transistor, and the seventh level input terminal VGL are connected in common;

[0117] The source of the fifth transistor, the gate of the fifth transistor, the source of the sixth transistor, and the fifth level input terminal VDD are connected in common;

[0118] The sixth level input terminal RST is connected to the gate of the ninth transistor;

[0119] The gate of the sixth transistor is commonly connected to the drain of the fifth transistor and the drain of the tenth transistor;

[0120] The drain of the sixth transistor is commonly connected to the drain of the eleventh transistor, the gate of the seventh transistor, and the gate of the eighth transistor;

[0121] The drain of the eighth transistor is commonly connected to the second end of the second capacitor, the drain of the twelfth transistor, and the output end Gout of the driving circuit.

[0122] The scanning principle in this application is as follows Figure 3 and 4 , Figure 4 This is a driving timing diagram of the embedded display driving circuit in the present invention. In the display (gate drive display scanning) stage, STV is used as the high level of the starting signal to turn on T2. ​​The potential at point Q becomes high at this time, turning on T3. The high level of EN passes through T3 and reaches point P, causing the potential at point P to become high.

[0123] Next, the high level of CK passes through the main driving transistor T12. Due to the high level coupling of CK and the pull-up of capacitor C2, the potential of point P is raised twice, so that T12 is fully turned on, and the high level of CK is output to Gout, completing the output of the high level of the gate of this row.

[0124] Furthermore, at this time, the high level of CK turns on T1 as well, and the low level of GLV pulls down the Q point level through T1, turning off T3, thereby preventing the high level of EN from passing through T3.

[0125] Since VDD is at a high level VGH within a frame, T5 and T6 are turned on, that is, point A is at a high level, and points A and P are at opposite potentials. The high level at point A turns on T7 and T8, and the low level of VGL passes through T7 to pull point P low. The low level of VGL passes through T8 to pull Gout low, thereby preventing Gout from rising.

[0126] The Gout of the next stage outputs a high level. Due to the cascade relationship, the RST of the previous stage is high, which turns on T9. VGL passes through T9, causing point P to be pulled low.

[0127] When entering the Touch (touch scanning) working stage, the CK signal stops outputting a high level, EN becomes a low level, and GLV becomes a high level. The high level of GLV turns on T4, and VGL passes through T4 so that the high level of point P will not be transmitted to the next level, that is, to prevent the potential of point P from remaining at a high level during the Touch stage, causing the gate of the main driving transistor T12 to be subjected to a large stress, resulting in a drift in the threshold voltage Vth of the transistor. When the Touch is ended and the display stage is entered, CK passes through T12, and the Gout output driving force is insufficient, resulting in abnormal phenomena such as display stripes.

[0128] During the touch phase, the intermediate signal transmitted to the next stage is stored at point Q. After the touch ends, EN goes high and GLV goes low. The high EN level is then output to point P via T3, restarting the next display cycle. By implementing the designed driver circuit, the second pull-down module responds to a high signal from the fourth-level input terminal GLV during the touch scan phase, enabling the low-level signal from the seventh-level input terminal VGL to be input to the second terminal of the output module via the second pull-down module. Furthermore, the first pull-down module responds to high signals from the fifth-level input terminal VDD, the sixth-level input terminal RST, and the first-level input terminal CK during the display scan phase, enabling the low-level signal from the seventh-level input terminal VGL to be input to the first terminal of the output module via the first pull-down module. This prevents the output module's input voltage from being held at point P at a high level for extended periods, which could cause the main transistor threshold voltage Vth to drift. This could lead to insufficient Gout output drive force during the display phase, resulting in abnormalities such as horizontal streaks on the display.

[0129] Embodiment 1 of the embedded display driving method of the present invention

[0130] like Figure 5 , Figure 5This is the first schematic diagram of the embedded display driving method in the present invention. A method for driving an embedded display adopts the driving circuit of the first aspect, including: step 100, in the display scanning stage, high-level signals are sequentially input to the output module through the input module until the output module completely outputs the high-level signal and completes the output of the row gate high-level signal; step 200, the low-level signal at the input end is input to the first end of the output module through the first pull-down module; step 300, in the touch scanning stage, the low-level signal is input to the second end of the output module through the second pull-down module.

[0131] Preferably, if Figure 6 , Figure 6 This is the second schematic diagram of the embedded display driving method in the present invention; step 200 includes step 210, starting the fourth pull-down unit and the fifth pull-down unit in response to the high-level signal at point A during the display phase, so that the low-level signal of the seventh-level input terminal VGL reaches point P through the fourth pull-down unit and reaches the output terminal Gout of the driving circuit through the fifth pull-down unit; step 220, starting the sixth pull-down unit, so that the low-level signal input from the seventh-level input terminal VGL is transmitted to point P to lower the level of point P.

[0132] The embedded display driving circuit and method described in the present invention are implemented. By implementing the designed driving circuit, the second pull-down module is turned on after responding to the high-level signal of the fourth level input terminal during the touch scanning phase, so that the low-level signal of the seventh level input terminal is input to the second terminal of the output module through the second pull-down module; and the first pull-down module is turned on after responding to the high-level signals of the fifth level input terminal, the sixth level input terminal, and the first level input terminal during the display scanning phase, so that the low-level signal of the seventh level input terminal is input to the first terminal of the output module through the first pull-down module. This prevents the input terminal voltage of the output module from being at a high level for a long time, causing the threshold voltage Vth of the main transistor to drift, resulting in insufficient Gout output driving force when entering the display phase, and the appearance of abnormal phenomena such as display stripes.

[0133] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An embedded display driving circuit, characterized in that: include: a first level input terminal, a second level input terminal, a third level input terminal, a fourth level input terminal, a fifth level input terminal, a sixth level input terminal, a seventh level input terminal, and a driving circuit output terminal; Input module; First drop-down module; Second drop-down module; The first level input terminal, the second level input terminal, and the third level input terminal are connected to the first terminal, the second terminal, and the third terminal of the input module; The fourth end, the fifth end, and the sixth end of the input module are connected to the third end of the output module, the second end of the second pull-down module, and the fifth end of the first pull-down module respectively; The first end, the third end, and the fourth end of the second pull-down module are respectively connected to the fourth level input end, the second end of the output module, and the fourth end of the first pull-down module; The first end, the second end, and the third end of the first pull-down module are connected to the fifth level input end, the sixth level input end, and the seventh level input end respectively; The sixth end of the first pull-down module is connected to the first end of the output module; The fourth end of the output module is connected to the output end of the driving circuit; The second level input terminal is used to input a high level start signal to the input module during the display scanning phase to start the input module; The first level input terminal and the third level input terminal are used to input high level signals to the output module in sequence through the input module during the display scanning phase, until the output module completely outputs the high level signal and completes the output of the row gate high level signal; The second pull-down module is configured to be turned on in response to a high-level signal at the fourth level input terminal during a touch scanning phase, so that a low-level signal at the seventh level input terminal is input to the second terminal of the output module through the second pull-down module; The first pull-down module is used to respond to the high-level signals of the fifth level input terminal, the sixth level input terminal, and the first level input terminal during the display scanning phase and then turn on, so that the low-level signal of the seventh level input terminal is input to the first end of the output module through the first pull-down module.

2. The embedded display driving circuit according to claim 1, wherein: The input module includes: a first input unit; Second input unit; a first pull-down unit; The first input unit is configured to start up after responding to a high level signal input from the second level input terminal during a display scanning phase, and transmit the high level signal to the second input unit; The second input unit is configured to start up after responding to the high level signal during the display scanning phase, so that the high level signal at the third level input terminal is transmitted to the output module; The first pull-down unit is configured to start up in response to a high level signal at the first level input terminal during a display scanning phase, so that a low level signal at the fourth level input terminal is transmitted to the second input unit to turn off the second input unit.

3. The embedded display driving circuit according to claim 2, wherein: The first pull-down module includes: A second pull-down unit, a third pull-down unit, a fourth pull-down unit, and a fifth pull-down unit; The second pull-down unit and the third pull-down unit are configured to start up in response to a high level signal input from the fifth level input terminal during the display phase, so that the pull-down point A of the first pull-down module is at a high level; The fourth pull-down unit and the fifth pull-down unit are used to start after responding to the high-level signal at point A in the display phase, so that the low-level signal at the seventh-level input terminal reaches the input voltage holding point P of the output module through the fourth pull-down unit, and the low-level signal at the seventh-level input terminal reaches the output terminal of the driving circuit through the fifth pull-down unit.

4. The embedded display driving circuit according to claim 3, wherein: The first pull-down module further includes: the sixth pull-down unit; The sixth pull-down unit is configured to start in response to a high-level signal inputted from the sixth level input terminal, so that a low-level signal inputted from the seventh level input terminal is transmitted to the point P to pull down the level of the point P.

5. The embedded display driving circuit according to claim 4, wherein: The first pull-down module further includes: seventh pull-down unit; eighth pull-down unit; The seventh pull-down unit and the eighth pull-down unit are used to respond to the high-level signal at point P in the display phase, so that the low-level signal at the seventh level input terminal is transmitted to point P to lower the level of point P.

6. The embedded display driving circuit according to claim 5, wherein: The input module also includes: a first filtering unit; The first filtering unit is used to filter the high-level signal output by the first input unit.

7. The embedded display driving circuit according to claim 6, wherein: The output module includes: a second filtering unit; Output unit; The second filtering unit is used to filter the high-level signal output from point P to the output end of the driving circuit; The output unit is configured to start in response to a high-level signal at point P during a display scanning phase, so that the high-level signal outputted from the third level output terminal is outputted to the output terminal of the driving circuit.

8. The embedded display driving circuit according to claim 7, wherein: The first pull-down unit, the first input unit, the second input unit, the second pull-down module, the second pull-down unit, the third pull-down unit, the fourth pull-down unit, the fifth pull-down unit, the sixth pull-down unit, the seventh pull-down unit, the eighth pull-down unit, and the output unit are respectively: a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a seventh transistor, an eighth transistor, a ninth transistor, a tenth transistor, an eleventh transistor, and a twelfth transistor; The first filtering unit and the second filtering unit are respectively: a first capacitor and a second capacitor; The gate of the first transistor is commonly connected to the first level input terminal and the source of the twelfth transistor; The source of the first transistor is commonly connected to the fourth level input terminal and the gate of the fourth transistor; The drain of the first transistor is commonly connected to the drain of the second transistor, the gate of the third transistor, and the first end of the first capacitor; The gate of the second transistor, the source of the second transistor, and the second level input terminal are connected in common; The source of the third transistor is connected to the third level input terminal; The drain of the third transistor is commonly connected to the drain of the fourth transistor, the gate of the twelfth transistor, the drain of the ninth transistor, the gate of the tenth transistor, the gate of the eleventh transistor, the first end of the second capacitor, and the drain of the seventh transistor; The source of the fourth transistor, the second end of the first capacitor, the source of the ninth transistor, the source of the tenth transistor, the source of the eleventh transistor, the source of the seventh transistor, the source of the eighth transistor, and the seventh level input terminal are connected in common; The source of the fifth transistor, the gate of the fifth transistor, the source of the sixth transistor, and the fifth level input terminal are connected in common; The sixth level input terminal is connected to the gate of the ninth transistor; The gate of the sixth transistor is commonly connected to the drain of the fifth transistor and the drain of the tenth transistor; The drain of the sixth transistor is commonly connected to the drain of the eleventh transistor, the gate of the seventh transistor, and the gate of the eighth transistor; The drain of the eighth transistor is commonly connected to the second end of the second capacitor, the drain of the twelfth transistor, and the output end of the driving circuit.

9. A method for driving an embedded display, using the driving circuit according to any one of claims 1 to 8, comprising: Step 100: In the display scanning phase, high-level signals are sequentially input to the output module through the input module until the output module completely outputs high-level signals and completes the output of row gate high-level signals; Step 200: Input the low-level signal of the input terminal to the first terminal of the output module through the first pull-down module; Step 300: In the touch scanning phase, a low-level signal is input to the second end of the output module through the second pull-down module.

10. The embedded display driving method according to claim 9, wherein: The step 200 includes: step 210, in response to a high-level signal at a pull-down point A of the first pull-down module during the display phase, activating a fourth pull-down unit and a fifth pull-down unit of the first pull-down module, so that a low-level signal at the seventh-level input terminal reaches an input voltage holding point P of the output module through the fourth pull-down unit and reaches an output terminal of the driving circuit through the fifth pull-down unit; Step 220 : Start the sixth pull-down unit of the first pull-down module so that the low-level signal inputted from the seventh level input terminal is transmitted to the point P to pull down the level of the point P.

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