GIP circuit and touch display device
By introducing a potential holding unit into the GIP circuit, the leakage problem during the touch period in the TDDI display device is solved, ensuring voltage stability during the display period, eliminating horizontal lines on the display, and improving display quality.
Patent Information
- Application Number
- CN202520297930.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-24
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-02-24
AI Technical Summary
In existing TDDI display devices, leakage of gate drive voltage caused by time-sharing drive of touch and display results in horizontal stripes on the display, affecting the user experience.
A potential holding unit is introduced into the GIP circuit to keep the gate terminal of the touch period drive output unit at a high potential, ensuring that the voltage during the display period meets the requirements. By setting the potential holding unit, the gate terminal of the touch period drive output unit is kept at a high potential, thus avoiding leakage.
It effectively solves the problem of horizontal lines on the display caused by leakage at the common contact point during touch, improves the display effect, and enhances the user experience.
Smart Images
Figure CN223842601U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of potential maintenance technology of GIP circuits, and in particular to a GIP circuit and a touch display device. Background Technology
[0002] Display devices utilize GIP (Gate in Panel) technology, which integrates the gate driver onto the display screen, enabling a narrow bezel effect. TDDI (Touch and Display Driver Integration) displays, by combining display and touch, have gained widespread use by applying both GIP and TDDI technologies simultaneously. However, existing TDDI combined with GIP technology suffers from horizontal stripe artifacts because the current driving method uses time-sharing between touch and display. Within a single frame, display and touch cycles are performed sequentially, often resulting in horizontal stripes during the transition between display and touch, thus degrading the user experience.
[0003] like Figure 1 and Figure 2 Because the display and touch periods alternate, the voltage at point P remains the same as the output voltage of the previous line when switching from display to touch, until the touch period ends and the next CK signal arrives, turning on transistor T3 and causing Gout to output a high level, thus starting the next display period. However, the touch period is relatively long, and during this time, there is leakage at point P (refer to the potentials of points Pn and Gn). Although the next CK signal arrives, turning on transistor T3 and causing Gout to output a high-level voltage, this voltage is lower than the voltage required for normal display, resulting in horizontal lines appearing on the display. Utility Model Content
[0004] Existing display devices use a time-sharing driving method for touch and display. Due to leakage during the touch period, the gate driving voltage is lower than the voltage required for normal display, which in turn leads to horizontal stripes on the display.
[0005] To address the aforementioned issues, a GIP circuit and a touch display device are proposed. By setting a potential holding unit, the gate terminal of the drive output unit is kept at a high potential during the touch period, ensuring that the output voltage of the drive output unit meets the requirements of the display period after switching to the display period. This solves the problem of horizontal lines on the display caused by leakage at the common contact point during the touch period.
[0006] Firstly, a GIP circuit includes:
[0007] Forward scan start unit;
[0008] Backscan startup unit;
[0009] Potential holding unit;
[0010] Drop-down unit;
[0011] Drive output unit;
[0012] The forward scan start unit and the reverse scan start unit are connected together and then electrically connected to the potential holding unit;
[0013] The potential holding unit, pull-down unit, and drive output unit are electrically connected to form a first common contact point;
[0014] The potential holding unit is used to turn on during the touch period to keep the first common contact point at a high potential.
[0015] In conjunction with the GIP circuit described in the first aspect of this utility model, in a first possible embodiment, the forward scan start unit includes...
[0016] First transistor;
[0017] The gate of the first transistor is connected to the start signal line, the drain is electrically connected to the forward scan signal line, and the source is electrically connected to the reverse scan start unit and the potential holding unit.
[0018] In conjunction with the first possible embodiment of the first aspect of this utility model, in the second possible embodiment, the reverse scan start unit includes:
[0019] Second transistor;
[0020] The gate of the second transistor is electrically connected to the reset signal line, the drain is electrically connected to the source of the first transistor and the potential holding unit, and the source is electrically connected to the reverse scan signal line.
[0021] In conjunction with the second possible embodiment of the first aspect of this utility model, in the third possible embodiment, the drive output unit includes:
[0022] The third transistor and the first capacitor;
[0023] The drain of the third transistor is electrically connected to the clock signal line, the gate is electrically connected to the first terminal of the first capacitor, the pull-down unit, and the potential holding unit, and the source is electrically connected to the pull-down unit and the second terminal of the first capacitor.
[0024] In conjunction with the third possible embodiment of the first aspect of this utility model, in the fourth possible embodiment, the potential holding unit includes:
[0025] The fourth transistor, the fifth transistor, and the sixth transistor;
[0026] The drain of the fourth transistor, the source of the first transistor, and the drain of the second transistor are electrically connected to the second common connection point. The gate of the fourth transistor is electrically connected to the first enable signal line. The source of the fourth transistor, the source of the fifth transistor, the pull-down unit, the first terminal of the first capacitor, and the gate of the third transistor are all connected to the first common connection point.
[0027] The gate of the fifth transistor is electrically connected to the second enable signal line, the drain of the fifth transistor is electrically connected to the source of the sixth transistor, the gate of the sixth transistor, the source of the first transistor, the drain of the second transistor, and the drain of the fourth transistor are all connected to the second common connection point, and the drain of the sixth transistor is electrically connected to the DC voltage line.
[0028] In a second aspect, a touch display device includes the GIP circuit described in the first aspect.
[0029] By implementing the GIP circuit and touch display device described in this utility model, a potential holding unit is set to keep the gate terminal of the drive output unit at a high potential during the touch period, ensuring that the output voltage of the drive output unit meets the requirements of the display period after switching to the display period, thereby solving the problem of horizontal lines on the display caused by leakage at the common contact point during the touch period. Attached Figure Description
[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0031] Figure 1 This is a schematic diagram of the GIP circuit principle in the prior art;
[0032] Figure 2 This is a schematic diagram of the driving timing of the GIP circuit in the prior art;
[0033] Figure 3 This is a schematic diagram of the module connection of the GIP circuit in this application;
[0034] Figure 4 This is a schematic diagram of the GIP circuit in this application;
[0035] Figure 5 This is a schematic diagram of the driving timing of the GIP circuit in this application. Detailed Implementation
[0036] The technical solutions of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, other embodiments obtained by those skilled in the art without creative effort are all within the scope of protection of this utility model.
[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0038] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.
[0039] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0041] Existing display devices use a time-sharing driving method for touch and display. Due to leakage during the touch period, the gate driving voltage is lower than the voltage required for normal display, which in turn leads to horizontal stripes on the display.
[0042] To address the above problems, a GIP circuit and a touch display device are proposed.
[0043] Firstly, a GIP circuit, such as Figure 3 , Figure 3This is a schematic diagram of the module connection of the GIP circuit in this application; it includes a forward scan start unit, a reverse scan start unit, a potential holding unit, a pull-down unit, and a drive output unit; the forward scan start unit and the reverse scan start unit are connected together and then electrically connected to the potential holding unit; the potential holding unit, the pull-down unit, and the drive output unit are electrically connected to form a first common contact point P; wherein, the potential holding unit is used to turn on during the touch term to keep the first common contact point P at a high potential. By setting the potential holding unit, the gate terminal of the drive output unit is kept at a high potential during the touch term, ensuring that the output voltage of the drive output unit meets the requirements of the display term after switching to the display term, thereby solving the problem of horizontal lines on the display caused by leakage at the common contact point during the touch term.
[0044] Furthermore, such as Figure 4 , Figure 4 This is a schematic diagram of the GIP circuit in this application; the forward scan startup unit includes a first transistor T1; the gate of the first transistor T1 is connected to the startup signal line STV, the drain is electrically connected to the forward scan signal line FW, and the source is electrically connected to the reverse scan startup unit and the potential holding unit.
[0045] like Figure 4 The reverse scan startup unit includes a second transistor T2; the gate of the second transistor T2 is electrically connected to the reset signal line RST, the drain is electrically connected to the source of the first transistor T1 and the potential holding unit, and the source is electrically connected to the reverse scan signal line BW.
[0046] Furthermore, such as Figure 4 The drive output unit includes a third transistor T3 and a first capacitor C1; the drain of the third transistor T3 is electrically connected to the clock signal line CK, the gate is electrically connected to the first terminal of the first capacitor C1, the pull-down unit and the potential holding unit, and the source is electrically connected to the second terminal of the pull-down unit and the first capacitor C1.
[0047] Furthermore, such as Figure 4The potential holding unit includes a fourth transistor T4, a fifth transistor T5, and a sixth transistor T6. The drain of the fourth transistor T4, the source of the first transistor T1, and the drain of the second transistor T2 are electrically connected to the second common junction Q. The gate of the fourth transistor T4 is electrically connected to the first enable signal line EN. The source of the fourth transistor T4, the source of the fifth transistor T5, the pull-down unit, the first terminal of the first capacitor C1, and the gate of the third transistor T3 are all connected to the first common junction P. The gate of the fifth transistor T5 is electrically connected to the second enable signal line TP_EN. The drain of the fifth transistor T5 is electrically connected to the source of the sixth transistor T6. The gate of the sixth transistor T6, the source of the first transistor T1, the drain of the second transistor T2, and the drain of the fourth transistor T4 are all connected to the second common junction Q. The drain of the sixth transistor T6 is electrically connected to the DC voltage line VDD.
[0048] like Figure 5 , Figure 5 This is a schematic diagram of the driving timing of the GIP circuit in this application. The VDD and EN potentials in the potential holding unit can be set to a constant VGH high level. When T4 is turned on, and the display screen switches from display mode to touch mode, TP_EN outputs a high level, turning on T5. The high level at point Q turns on T6. The high level VDD reaches point P through T6 and T5, meaning that the high level VGH continuously charges point P, maintaining its potential until the touch period ends. When the next clock signal CK arrives, transistor T3 turns on, and the drive output unit Gout outputs a high level, thus starting the next display period. Figure 5 The dashed lines representing Pn and Gn in the figure represent potentials in the prior art. In this embodiment, the potential leakage at point P can be maintained, thereby reducing the horizontal stripe phenomenon.
[0049] In a second aspect, a touch display device includes the GIP circuitry of the first aspect.
[0050] The GIP circuit and touch display device implementing this utility model solves the problem of horizontal lines on the display caused by leakage at the common contact point during the touch period by setting a potential holding unit to keep the gate terminal of the drive output unit at a high potential during the touch period. This ensures that the output voltage of the drive output unit meets the requirements of the display period after switching to the display period.
[0051] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.
Claims
1. A GIP circuit, characterized in that, include: Forward scan start unit; Backscan startup unit; Potential holding unit; Drop-down unit; Drive output unit; The forward scan start unit and the reverse scan start unit are connected together and then electrically connected to the potential holding unit; The potential holding unit, pull-down unit, and drive output unit are electrically connected to form a first common contact point; The potential holding unit is used to be turned on during the touch period to keep the potential of the first common contact point at a high potential.
2. The GIP circuit according to claim 1, characterized in that, The forward scan start unit includes First transistor; The gate of the first transistor is connected to the start signal line, the drain is electrically connected to the forward scan signal line, and the source is electrically connected to the reverse scan start unit and the potential holding unit.
3. The GIP circuit according to claim 2, characterized in that, The reverse scan startup unit includes: Second transistor; The gate of the second transistor is electrically connected to the reset signal line, the drain is electrically connected to the source of the first transistor and the potential holding unit, and the source is electrically connected to the reverse scan signal line.
4. The GIP circuit according to claim 3, characterized in that, The drive output unit includes: The third transistor and the first capacitor; The drain of the third transistor is electrically connected to the clock signal line, the gate is electrically connected to the first terminal of the first capacitor, the pull-down unit, and the potential holding unit, and the source is electrically connected to the pull-down unit and the second terminal of the first capacitor.
5. The GIP circuit according to claim 4, characterized in that, The potential holding unit includes: The fourth transistor, the fifth transistor, and the sixth transistor; The drain of the fourth transistor, the source of the first transistor, and the drain of the second transistor are electrically connected to the second common connection point. The gate of the fourth transistor is electrically connected to the first enable signal line. The source of the fourth transistor, the source of the fifth transistor, the pull-down unit, the first terminal of the first capacitor, and the gate of the third transistor are all connected to the first common connection point. The gate of the fifth transistor is electrically connected to the second enable signal line, the drain of the fifth transistor is electrically connected to the source of the sixth transistor, the gate of the sixth transistor, the source of the first transistor, the drain of the second transistor, and the drain of the fourth transistor are all connected to the second common connection point, and the drain of the sixth transistor is electrically connected to the DC voltage line.
6. A touch display device, characterized in that, Includes the GIP circuit as described in any one of claims 1-5.