A driving circuit of a display panel and a display panel

Abstract

The application provides a display panel driving circuit and a display panel. The display panel driving circuit comprises a touch driving unit and an auxiliary driving unit. The touch driving unit comprises a touch unit, a touch signal detection unit and a common signal transmission unit. The touch signal detection unit and the common signal transmission unit are connected to the touch unit respectively. The touch signal detection unit is used for connecting a detection end of a driving control unit. The common signal transmission unit is used for connecting a common voltage end of the driving control unit. The touch signal detection unit comprises a first detection switch and a second detection switch. The auxiliary driving unit is connected to control ends of the first detection switch and the second detection switch and is used for regulating voltages of the control ends of the first detection switch and / or the second detection switch. The voltages of the control ends of the first detection switch and / or the second detection switch are regulated by the auxiliary driving unit. The on-resistance of the first detection switch and / or the second detection switch is reduced, the overcurrent capacity is enhanced, and the touch signal transmission capacity is improved.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a driving circuit for a display panel and a display panel itself. Background Technology

[0002] The two-stage multiplexer circuit (TouchMux2 circuit) in the touch display panel, responsible for touch signal acquisition and transmission, serves as the signal bridge between the touch pads and the signal terminals, and is a key unit for enabling collaborative operation between touch and display. In existing technology, the Touch Mux2 design is the mainstream industry architecture, which consists of four transmission gate transistors, with the specific structure as follows: Figure 1 As shown.

[0003] However, as touch display technology upgrades to scenarios with narrow bezels, high resolution, high reporting rate, and high current transmission, the core technical defects of the Touch Mux2 design have become increasingly apparent. It can no longer meet the performance requirements of high-end touch products. For example, the Vgs (gate-source) voltage of the T11 and T12 transistors is insufficient, and the impedance characteristics are poor, resulting in insufficient overcurrent capability and severe attenuation during touch signal transmission. Summary of the Invention

[0004] This invention mainly provides a driving circuit for a display panel and a display panel, which can reduce the on-resistance of transistors, enhance overcurrent capability, and improve touch signal transmission capability.

[0005] To solve the above-mentioned technical problems, the first technical solution adopted by the present invention is: to provide a driving circuit for a display panel, including: a touch driving unit and an auxiliary driving unit. The touch driving unit includes: a touch unit, a touch signal detection unit and a common signal transmission unit. The touch signal detection unit and the common signal transmission unit are respectively connected to the touch unit, and the touch signal detection unit is used to connect to the detection terminal of the driving control unit, and the common signal transmission unit is used to connect to the common voltage terminal of the driving control unit. The touch signal detection unit includes: a first detection switch and a second detection switch; The first path terminal of the first detection switch is connected to the control unit, and the second path terminal of the first detection switch is connected to the detection terminal of the drive control unit; the first path terminal of the second detection switch is connected to the control unit, and the second path terminal of the second detection switch is connected to the detection terminal of the drive control unit. The auxiliary drive unit is connected to the control terminals of the first detection switch and the second detection switch, and is used to regulate the voltage of the control terminals of the first detection switch and / or the second detection switch.

[0006] In one embodiment, the auxiliary driving unit includes: a gate voltage regulation unit and a reset auxiliary unit; The gate voltage regulation unit is connected to the control terminal of the first detection switch and the control terminal of the second detection switch, and is also connected to the first voltage input terminal. It is used to regulate the voltage of the control terminals of the first detection switch and / or the second detection switch using the first voltage provided by the first voltage input terminal. The reset auxiliary unit is connected to the control terminals of the first detection switch and the second detection switch, and is also connected to the second voltage input terminal. It is used to regulate the voltage of the control terminals of the first detection switch and / or the second detection switch using the second voltage provided by the second voltage input terminal; wherein the first voltage is greater than the second voltage.

[0007] In one embodiment, the gate voltage regulation unit includes: a first gate voltage regulation unit and a second gate voltage regulation unit; The first gate voltage regulation unit is connected to the control terminal of the first detection switch and to the first voltage input terminal, and is used to regulate the voltage of the control terminal of the first detection switch using the first voltage; the second gate voltage regulation unit is connected to the control terminal of the second detection switch and to the first voltage input terminal, and is used to regulate the voltage of the control terminal of the second detection switch using the first voltage.

[0008] In one embodiment, the first gate voltage regulation unit includes: a first regulation switch and a first energy storage capacitor. The first path terminal of the first control switch is connected to the first voltage input terminal to receive the first voltage; the second path terminal of the first control switch is connected to the control terminal of the first detection switch to receive the first control signal; the first terminal of the first energy storage capacitor is connected to the first path terminal of the first detection switch, and the second terminal of the first energy storage capacitor is connected to the control terminal of the first detection switch. The second gate voltage regulation unit includes: a second regulation switch and a second energy storage capacitor; The first path terminal of the second control switch is connected to the first voltage input terminal to receive the first voltage; the second path terminal of the second control switch is connected to the control terminal of the second detection switch to receive the second control signal; the first terminal of the second energy storage capacitor is connected to the first path terminal of the second detection switch, and the second terminal of the second energy storage capacitor is connected to the control terminal of the second detection switch. The first and second control switches are either MOSFETs or diodes.

[0009] In one embodiment, the reset auxiliary unit includes: a first reset unit and a second reset unit; The first reset unit is connected to the control terminal of the first detection switch and to the second voltage input terminal, and is used to regulate the voltage of the control terminal of the first detection switch using the second voltage; The second reset unit is connected to the control terminal of the second detection switch and to the second voltage input terminal, and is used to regulate the voltage of the control terminal of the second detection switch using the second voltage.

[0010] In one embodiment, the first reset unit includes: a first reset switch, a first path terminal of the first reset switch connected to the control terminal of the first detection switch, a second path terminal of the first reset switch connected to the second voltage input terminal to receive a second voltage, and the control terminal of the first reset switch receiving a third control signal; The second reset unit includes: a second reset switch; the first path terminal of the second reset switch is connected to the control terminal of the second detection switch, the second path terminal of the second reset switch is connected to the second voltage input terminal to receive the second voltage, and the control terminal of the second reset switch receives the fourth control signal.

[0011] In one embodiment, the common signal transmission unit includes: a first transmission switch and a second transmission switch; The first path terminal of the first transmission switch is connected to the common voltage terminal, the second path terminal of the first transmission switch is connected to the contact control unit, and the control terminal of the first transmission switch receives the fifth control signal; the first path terminal of the second transmission switch is connected to the common voltage terminal, the second path terminal of the second transmission switch is connected to the contact control unit, and the control terminal of the second transmission switch receives the sixth control signal.

[0012] In one embodiment, in response to a display command, a first gate voltage control unit controls a first detection switch to be in an on state during the display period, and a second gate voltage control unit controls a second detection switch to be in an on state during the display period; and the first transmission switch and the second transmission switch are in an on state during the display period; or In response to a display command, the first gate voltage control unit controls the second detection switch to be in the on state during the first display time period, and the second transmission switch is in the on state during the first display time period; the second gate voltage control unit controls the first detection switch to be in the on state during the second display time period, and the first transmission switch is in the on state during the second display time period; wherein, the first display time period corresponds to the nth display stage, and the second display time period corresponds to the (n+m)th display stage.

[0013] In one embodiment, in response to a touch command, the first energy storage capacitor is in a charging state during the first pre-charging phase; In the first convergence phase, the detection terminal and the common voltage terminal provide convergence signals, the first energy storage capacitor is in a discharging state, the first detection switch is kept on, and the convergence signal provided by the detection terminal is transmitted to the first touch pad of the touch unit; the first transmission switch is in a conducting state, and the convergence signal provided by the common voltage terminal is transmitted to the second touch pad of the touch unit; the second reset unit is in a first working state, and the second detection switch is kept off. In the first detection phase, the first energy storage capacitor is in a discharging state, keeping the first detection switch on, and driving the control unit to detect the first touch signal of the first touch pad using the detection terminal; During the second pre-charge phase, the second energy storage capacitor is in a charging state; In the second convergence phase, the detection terminal and the common voltage terminal provide convergence signals, the second energy storage capacitor is in a discharging state, the second detection switch is kept on, and the convergence signal provided by the detection terminal is transmitted to the second touch pad of the touch unit; the second transmission switch is in a conducting state, and the convergence signal provided by the common voltage terminal is transmitted to the first touch pad of the touch unit; the first reset unit is in a first working state, and the first detection switch is kept off. During the second detection phase, the second energy storage capacitor is in a discharging state, keeping the second detection switch on, and driving the control unit to detect the second touch signal of the second touch pad using the detection terminal.

[0014] To solve the above-mentioned technical problems, the second technical solution adopted by the present invention is: to provide a display panel, the display panel comprising: The driving circuit includes the driving circuit of the display panel mentioned above. The drive control unit includes a detection terminal and a common voltage terminal. The detection terminal is connected to the control signal detection unit, and the common voltage terminal is connected to the common signal transmission unit.

[0015] The beneficial effects of this invention are as follows: Unlike existing technologies, the display panel driving circuit provided by this invention includes a touch driving unit and an auxiliary driving unit. The touch driving unit includes a touch unit, a touch signal detection unit, and a common signal transmission unit. The touch signal detection unit and the common signal transmission unit are respectively connected to the touch unit. The touch signal detection unit is used to connect to the detection terminal of the driving control unit, and the common signal transmission unit is used to connect to the common voltage terminal of the driving control unit. The touch signal detection unit includes a first detection switch and a second detection switch. The first path terminal of the first detection switch is connected to the touch unit, and the second path terminal of the first detection switch is connected to the detection terminal of the driving control unit. The first path terminal of the second detection switch is connected to the touch unit, and the second path terminal of the second detection switch is connected to the detection terminal of the driving control unit. The auxiliary driving unit is connected to the control terminals of the first and second detection switches and is used to regulate the voltage of the control terminals of the first and / or second detection switches. By setting an auxiliary drive unit to control the voltage at the control terminals of the first detection switch and / or the second detection switch, the on-resistance of the first detection switch and / or the second detection switch is reduced, the overcurrent capability is enhanced, and the touch signal transmission capability is improved. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of a structural embodiment of a driving circuit provided by the prior art; Figure 2 A schematic diagram of the structure of a first embodiment of the driving circuit provided in this application; Figure 3 A schematic diagram of the structure of the second embodiment of the driving circuit provided in this application; Figure 4 for Figure 3 A timing diagram of one embodiment of the driving circuit shown; Figure 5 for Figure 3 A timing diagram of another embodiment of the driving circuit shown; Figure 6 A schematic diagram of the structure of the third embodiment of the driving circuit provided in this application; Figure 7 A schematic diagram of the structure of an embodiment of the display panel provided in this application.

[0018] Explanation of reference numerals in the attached drawings: Touch driving unit 1, auxiliary driving unit 2, touch unit 11, touch signal detection unit 12, common signal transmission unit 13, detection terminal SX, common voltage terminal SX_DUM, first detection switch T1, second detection switch T2, gate voltage adjustment unit 21, reset auxiliary unit 22, first gate voltage adjustment unit 211, second gate voltage adjustment unit 212, first adjustment switch T8, first energy storage capacitor C1, second adjustment switch T7, second energy storage capacitor C2, first reset unit 221, second reset unit 222, first reset switch T5, second reset switch T6, first transmission switch T3, second transmission switch T4, first touch pad PAD1, second touch pad PAD2, first control signal P1, second control signal P2, fifth control signal P3, sixth control signal P4, third control signal P5 and fourth control signal P6, display panel 70, driving circuit 71, driving control unit 72. Detailed Implementation

[0019] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0020] In the following description, specific details such as particular system architectures, interfaces, and technologies are presented for illustrative purposes rather than for limiting purposes, in order to provide a thorough understanding of this application.

[0021] In this article, the term "and / or" simply describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " generally indicates that the preceding and following related objects have an "or" relationship. Furthermore, "more" in this article means two or more objects.

[0022] 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 application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0023] Before providing a further detailed description of the embodiments of this application, the nouns and terms involved in the embodiments of this application will be explained, and the nouns and terms involved in the embodiments of this application shall be interpreted as follows.

[0024] The two-stage multiplexer circuit (TouchMux2 circuit) in the touch display panel, responsible for touch signal acquisition and transmission, serves as the signal bridge between the touch pads and the signal terminals, and is a key unit for enabling collaborative operation between touch and display. In existing technology, the Touch Mux2 design is the mainstream industry architecture, consisting of four transistors, with the specific structure as follows... Figure 1 As shown. Specifically, the four transistors are transistors T11, T12, T13, and T14. However, as touch display technology upgrades towards narrow bezels, high resolution, high reporting rates, and high current transmission scenarios, the core technical defects of the Touch Mux2 design have become increasingly apparent, failing to meet the performance requirements of high-end touch products. For example, the Vgs (gate-source) voltage of transistors T11 and T12 is insufficient, resulting in poor impedance characteristics, inadequate overcurrent capability, and severe attenuation during touch signal transmission.

[0025] In view of this, this application provides a driving circuit for a display panel. To enable those skilled in the art to better understand the technical solution of this invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] See Figure 2 , Figure 2The schematic diagram of the first embodiment of the driving circuit for the display panel provided in this application specifically includes: a touch driving unit 1 and an auxiliary driving unit 2. The touch driving unit 1 includes: a touch unit 11, a touch signal detection unit 12 and a common signal transmission unit 13. The touch signal detection unit 12 and the common signal transmission unit 13 are respectively connected to the touch unit 11. The touch signal detection unit 12 is used to connect to the detection terminal SX of the driving control unit, and the common signal transmission unit 13 is used to connect to the common voltage terminal SX_DUM of the driving control unit.

[0027] The touch signal detection unit 12 includes: a first detection switch T1 and a second detection switch T2; the first path terminal of the first detection switch T1 is connected to the touch control unit 11, and the second path terminal of the first detection switch T1 is connected to the detection terminal SX of the drive control unit; the first path terminal of the second detection switch T2 is connected to the touch control unit 11, and the second path terminal of the second detection switch T2 is connected to the detection terminal SX of the drive control unit.

[0028] The auxiliary drive unit 2 is connected to the control terminals of the first detection switch T1 and the second detection switch T2, and is used to regulate the voltage of the control terminals of the first detection switch T1 and / or the second detection switch T2.

[0029] It should be noted that existing circuit structures (such as...) Figure 1 In this circuit, the Vgs (gate-source) voltages of transistors T11 (i.e., the first detection switch) and T12 (i.e., the second detection switch) directly depend on the voltage provided by the detection terminal SX / common voltage terminal SX_DUM. Due to the upper limit of the signal level and the line voltage drop, the Vgs amplitude of transistors T11 and T12 is too low. After actual measurement, it was found that the Vgs amplitude of transistor T11 is only 1.0~1.5V and the Vgs amplitude of transistor T12 is only 1.5~2.0V. This results in high on-resistance of transistors T11 and T12, poor impedance characteristics, insufficient overcurrent capacity, and severe attenuation of touch signal transmission, making it unsuitable for high-speed, high-current touch scenarios.

[0030] The driving circuit provided in this application embodiment, by setting an auxiliary driving unit 2, and the auxiliary driving unit 2 being connected to the control terminals of the first detection switch T1 and the second detection switch T2, is used to regulate the voltage of the control terminals of the first detection switch T1 and / or the second detection switch T2, thereby regulating the amplitude of Vgs of the first detection switch T1 and / or the second detection switch T2, effectively reducing the on-resistance of the transistor, enhancing the overcurrent capability, and reducing the attenuation of the touch signal, so that the driving circuit is adapted to high-speed, high-current touch scenarios.

[0031] In one specific embodiment, combined with Figure 3The auxiliary driving unit 2 includes a gate voltage regulation unit 21 and a reset auxiliary unit 22. The gate voltage regulation unit 21 is connected to the control terminals of the first detection switch T1 and the second detection switch T2, and is also connected to a first voltage input terminal. It is used to regulate the voltage of the control terminals of the first detection switch T1 and / or the second detection switch T2 using a first voltage VGH provided by the first voltage input terminal. The reset auxiliary unit 22 is connected to the control terminals of the first detection switch T1 and the second detection switch T2, and is also connected to a second voltage input terminal. It is used to regulate the voltage of the control terminals of the first detection switch T1 and / or the second detection switch T2 using a second voltage VGL provided by the second voltage input terminal; wherein the first voltage VGH is greater than the second voltage VGL.

[0032] In one specific embodiment, the gate voltage regulation unit 21 includes: a first gate voltage regulation unit 211 and a second gate voltage regulation unit 212. The first gate voltage regulation unit 211 is connected to the control terminal of the first detection switch T1 and to the first voltage input terminal, and is used to regulate the voltage of the control terminal of the first detection switch T1 using the first voltage VGH; the second gate voltage regulation unit 212 is connected to the control terminal of the second detection switch T2 and to the first voltage input terminal, and is used to regulate the voltage of the control terminal of the second detection switch T2 using the first voltage VGH.

[0033] In one specific embodiment, the first gate voltage regulation unit 211 includes a first regulation switch T8 and a first energy storage capacitor C1. The first path terminal of the first regulation switch T8 is connected to a first voltage input terminal, receiving a first voltage VGH. The second path terminal of the first regulation switch T8 is connected to the control terminal of a first detection switch T1, and the control terminal of the first regulation switch T8 receives a first control signal P1. The first terminal of the first energy storage capacitor C1 is connected to the first path terminal of the first detection switch T1, and the second terminal of the first energy storage capacitor C1 is connected to the control terminal of the first detection switch T1. It should be noted that the connection node between the second terminal of the first energy storage capacitor C1 and the control terminal of the first detection switch T1 is defined as the PU1 node.

[0034] The second gate voltage regulation unit 212 includes: a second regulation switch T7 and a second energy storage capacitor C2; the first path terminal of the second regulation switch T7 is connected to the first voltage input terminal and receives the first voltage VGH, the second path terminal of the second regulation switch T7 is connected to the control terminal of the second detection switch T2, and the control terminal of the second regulation switch T7 receives the second control signal P2; the first terminal of the second energy storage capacitor C2 is connected to the first path terminal of the second detection switch T2, and the second terminal of the second energy storage capacitor C2 is connected to the control terminal of the second detection switch T2. It should be noted that the connection node between the second terminal of the second energy storage capacitor C2 and the control terminal of the second detection switch T2 is defined as the PU2 node.

[0035] The reset auxiliary unit 22 includes a first reset unit 221 and a second reset unit 222. The first reset unit 221 is connected to the control terminal of the first detection switch T1 and to the second voltage input terminal, and is used to regulate the voltage of the control terminal of the first detection switch T1 using the second voltage VGL. The second reset unit 222 is connected to the control terminal of the second detection switch T2 and to the second voltage input terminal, and is used to regulate the voltage of the control terminal of the second detection switch T2 using the second voltage VGL.

[0036] In one specific embodiment, the first reset unit 221 includes: a first reset switch T5, the first path terminal of the first reset switch T5 being connected to the control terminal of the first detection switch T1, the second path terminal of the first reset switch T5 being connected to the second voltage input terminal and receiving the second voltage VGL, and the control terminal of the first reset switch T5 receiving the third control signal P5. The second reset unit 222 includes: a second reset switch T6; the first path terminal of the second reset switch T6 being connected to the control terminal of the second detection switch T2, the second path terminal of the second reset switch T6 being connected to the second voltage input terminal and receiving the second voltage VGL, and the control terminal of the second reset switch T6 receiving the fourth control signal P6.

[0037] It should be noted that the common signal transmission unit 13 also includes a first transmission switch T3 and a second transmission switch T4. The first path terminal of the first transmission switch T3 is connected to the common voltage terminal SX_DUM, and the second path terminal of the first transmission switch T3 is connected to the control unit 11. The control terminal of the first transmission switch T3 receives the fifth control signal P3. The first path terminal of the second transmission switch T4 is connected to the common voltage terminal SX_DUM, and the second path terminal of the second transmission switch T4 is connected to the control unit 11. The control terminal of the second transmission switch T4 receives the sixth control signal P4.

[0038] In one specific embodiment, the touch unit 11 includes a first touch pad PAD1 and a second touch pad PAD2. The first path terminal of the first detection switch T1 and the second path terminal of the second transmission switch T4 are connected to the first touch pad PAD1, and the first path terminal of the second detection switch T2 and the second path terminal of the first transmission switch T3 are connected to the second touch pad PAD2.

[0039] The first touch pad PAD1 and the second touch pad PAD2 have the same function, and also have the ability to perform different functions at the same time, for example, in the following scenarios: ① The first touch pad PAD1 performs touch sensing, and the second touch pad PAD2 receives the VCOM voltage provided by the common voltage terminal SX_DUM. Specifically, in this process, the first detection switch T1 is turned on, and the touch signal on the first touch pad PAD1 is detected through the detection terminal SX; the first transmission switch T3 is turned on, and the VCOM voltage provided by the common voltage terminal SX_DUM is transmitted to the second touch pad PAD2. Or ② The first touch pad PAD1 receives the VCOM voltage provided by the common voltage terminal SX_DUM, and the second touch pad PAD2 performs touch sensing. Specifically, in this process, the second detection switch T2 is turned on, and the touch signal on the second touch pad PAD2 is detected through the detection terminal SX; the second transmission switch T4 is turned on, and the VCOM voltage provided by the common voltage terminal SX_DUM is transmitted to the first touch pad PAD1. Alternatively, ③ both the first touch pad PAD1 and the second touch pad PAD2 receive the VCOM voltage provided by the common voltage terminal SX_DUM. Specifically, in this process, both the common voltage terminal SX_DUM and the detection terminal SX provide the VCOM voltage, and the first detection switch T1 and the second detection switch T2, the first transmission switch T3 and the second transmission switch T4 are all turned on, transmitting the VCOM voltage to the first touch pad PAD1 and the second touch pad PAD2.

[0040] During the display phase, in response to the display command, the first gate voltage control unit 211 controls the first detection switch T1 to be in the on state during the display period, the second gate voltage control unit 212 controls the second detection switch T2 to be in the on state during the display period, and the first transmission switch T3 and the second transmission switch T4 are in the on state during the display period.

[0041] For details, please refer to Figure 4During the display phase t1, both the common voltage terminal SX_DUM and the detection terminal SX provide VCOM voltage. The first control signal P1 and the second control signal P2 are high. At this time, the first control switch T8 and the second control switch T7 are turned on. The first voltage VGH charges the first energy storage capacitor C1 through the first control switch T8 and the second energy storage capacitor C2 through the second control switch T7. This clamps the voltage at the control terminals of the first detection switch T1 and the second detection switch T2 to VGH voltage (e.g., 25V), ensuring that the first detection switch T1 and the second detection switch T2 are fully turned on and do not interfere with the pixel driving of the display area. The fifth control signal P3 and the sixth control signal P4 are high, and the first transmission switch T3 and the second transmission switch T4 are turned on. At this time, the voltage across the entire display panel is VCOM voltage, with consistent potential, avoiding uneven brightness or stripe interference in the display image and ensuring normal display of the display area. It should be noted that during this process, the third control signal P5 and the fourth control signal P6 are low, and the first reset switch T5 and the second reset switch T6 are turned off.

[0042] It should be noted that, since the first control switch T8 and the second control switch T7 are turned on, the first energy storage capacitor C1 and the second energy storage capacitor C2 are in a fully charged state, for example, charged to 25V, in preparation for the subsequent Vgs increase of the first detection switch T1 and the second detection switch T2.

[0043] During this process, the voltage of the control terminals of the first detection switch T1 and the second detection switch T2 is adjusted by the first gate voltage adjustment unit 211 (i.e., the first adjustment switch T8 and the first energy storage capacitor C1) and the second gate voltage adjustment unit 212 (i.e., the second adjustment switch T7 and the second energy storage capacitor C2), which can maintain the display quality, complete the circuit initialization before touch, and ensure that the display and touch functions do not interfere with each other.

[0044] In response to a touch command, the system enters touch phase t2. Touch phase t2 includes a first pre-charge phase a, a first convergence phase b, a first detection phase c, a second pre-charge phase d, a second convergence phase e, and a second detection phase f.

[0045] In the first pre-charge stage a, the first energy storage capacitor C1 is in a charging state. Specifically, in the first pre-charge stage a, the first control signal P1, the fifth control signal P3, and the sixth control signal P4 are at high levels, while the second control signal P2, the third control signal P5, and the fourth control signal P6 are at low levels. At this time, because the first control signal P1 is at a high level, the first control switch T8 is turned on, and the first voltage VGH charges the first energy storage capacitor C1 through the first control switch T8, so that the first energy storage capacitor C1 is in a charging state. However, because the second control signal P2 is at a low level, the second control switch T7 is turned off, and the second energy storage capacitor C2 is not charged.

[0046] In the first convergence phase b, the detection terminal SX and the common voltage terminal SX_DUM provide convergence signals (e.g., 3.5~5.0V). The first control signal P1, second control signal P2, sixth control signal P4, and third control signal P5 are low, while the fifth control signal P3 and fourth control signal P6 are high. Although the first control signal P1 is low and the first control switch T8 is off, the first energy storage capacitor C1 is in a discharging state, maintaining the first detection switch T1 on and transmitting the convergence signal provided by the detection terminal SX to the first touch pad PAD1 of the touch unit 11. Additionally, the fifth control signal P3 is high, and the first transmission switch T3 is on, transmitting the convergence signal provided by the common voltage terminal SX_DUM to the second touch pad PAD2 of the touch unit 11. It should be noted that at this time, the second reset unit 222 is in its first operating state, maintaining the second detection switch T2 off. Specifically, when the fourth control signal P6 is high, the second reset switch T6 is turned on, which pulls down the control terminal voltage of the second detection switch T2, ensuring that the second detection switch T2 remains in the off state.

[0047] In the first detection phase c, the first energy storage capacitor C1 is in a discharging state, keeping the first detection switch T1 on. The drive control unit uses the detection terminal SX to detect the first touch signal of the first touch pad PAD1. The drive control unit compares the detected first touch signal with the same signal to determine whether the first touch pad PAD1 has been triggered. Understandably, during this process, the fourth control signal P6 remains at a high level, ensuring that the second detection switch T2 remains in the off state.

[0048] During the second pre-charge stage d, the second energy storage capacitor C2 is in a charging state. Specifically, during the second pre-charge stage d, the first control signal P1, the third control signal P5, and the fourth control signal P6 are at low levels, while the fifth control signal P3, the second control signal P2, and the sixth control signal P4 are at high levels. At this time, because the second control signal P2 is at a high level, the second control switch T7 is turned on, and the first voltage VGH charges the second energy storage capacitor C2 through the second control switch T7, thus putting the second energy storage capacitor C2 in a charging state. However, because the first control signal P1 is at a low level, the first control switch T8 is turned off, and the first energy storage capacitor C1 is not charged.

[0049] In the second convergence phase e, the detection terminal SX and the common voltage terminal SX_DUM provide convergence signals (e.g., 3.5~5.0V). The first control signal P1, the second control signal P2, the fifth control signal P3, and the fourth control signal P6 are at low levels, while the sixth control signal P4 and the third control signal P5 are at high levels. Although the second control signal P2 is at a low level and the second control switch T7 is off, the second energy storage capacitor C2 is in a discharging state, which can maintain the second detection switch T2 on, transmitting the convergence signal provided by the detection terminal SX to the second touch pad PAD2 of the touch unit 11. In addition, the sixth control signal P4 is at a high level and the second transmission switch T4 is on, transmitting the convergence signal provided by the common voltage terminal SX_DUM to the first touch pad PAD1 of the touch unit 11. It should be noted that at this time, the first reset unit 221 is in the first working state, maintaining the first detection switch T1 off. Specifically, when the third control signal P5 is high, the first reset switch T5 is turned on, which pulls down the control terminal voltage of the first detection switch T1, ensuring that the first detection switch T1 remains in the off state.

[0050] During the second detection phase f, the second energy storage capacitor C2 is in a discharging state, keeping the second detection switch T2 on. The drive control unit uses the detection terminal SX to detect the second touch signal of the second touch pad PAD2. The drive control unit compares the detected second touch signal with the same signal to determine whether the second touch pad PAD2 has been triggered. Understandably, during this process, the third control signal P5 remains at a high level, ensuring that the first detection switch T1 remains in the off state.

[0051] The driving circuit in this embodiment maintains the amplitude of Vgs of the first detection switch T1 and the second detection switch T2 by setting the first energy storage capacitor C1 and the second energy storage capacitor C2, which effectively reduces the on-resistance of the transistor, enhances the overcurrent capability, and reduces the attenuation of the touch signal, making the driving circuit suitable for high-speed, high-current touch scenarios.

[0052] It should be noted that in the above embodiments, during the display stage, the first detection switch T1 and the second detection switch T2 are always in the normally open state. The abnormal accumulation of channel carriers causes the threshold voltage (Vth) to shift positively (characteristic right-biased), which can easily lead to characteristic right-biasedness, further increasing the on-resistance and continuously weakening the overcurrent capacity, forming a vicious cycle of "insufficient Vgs → high impedance → characteristic right-biasedness → performance degradation". After long-term use, problems such as slow touch response, signal recognition error, or even touch failure are likely to occur, which seriously affects the service life of the product.

[0053] In view of this, the driving circuit of this application further proposes that, during the display stage, in response to a display command, the first gate voltage control unit 211 controls the second detection switch T2 to be in the on state during the first display time period, and the second transmission switch T4 is in the on state during the first display time period; the second gate voltage control unit 212 controls the first detection switch T1 to be in the on state during the second display time period, and the first transmission switch T3 is in the on state during the second display time period; wherein, the first display time period corresponds to the nth display stage, and the second display time period corresponds to the (n+m)th display stage. In a specific embodiment, the first display time period corresponds to the nth display stage, and the second display time period corresponds to the (n+1)th display stage; in other embodiments, m can also be 2, 3, 5, etc., and is not specifically limited.

[0054] Specifically, in combination Figure 5 During the first display time period n, both the common voltage terminal SX_DUM and the detection terminal SX provide VCOM voltage. The second control signal P2 is high, at which time the second control switch T7 is turned on. The first voltage VGH charges the second energy storage capacitor C2 through the second control switch T7, clamping the voltage at the control terminal of the second detection switch T2 to VGH voltage (e.g., 25V), ensuring that the second detection switch T2 is fully turned on. The sixth control signal P4 is high, and the second transmission switch T4 is turned on. At this time, both the first touch pad PAD1 and the second touch pad PAD2 are at VCOM voltage, with the same potential.

[0055] During the second display time period n+1, both the common voltage terminal SX_DUM and the detection terminal SX provide VCOM voltage. The first control signal P1 is high, at which time the first control switch T8 is turned on. The first voltage VGH charges the first energy storage capacitor C1 through the first control switch T8, clamping the voltage at the control terminal of the first detection switch T1 to VGH voltage (e.g., 25V), ensuring that the first detection switch T1 is fully turned on. The fifth control signal P3 is high, and the first transmission switch T3 is turned on. At this time, both the first touch pad PAD1 and the second touch pad PAD2 are at VCOM voltage, with the same potential.

[0056] In this embodiment, during two adjacent display stages, the first detection switch T1 and the second detection switch T2 are alternately turned on, which can improve the right-biased characteristic phenomenon caused by being continuously in the normally open state, further reduce the conduction impedance, improve the product life, avoid uneven brightness or stripe interference in the display screen, and ensure normal display of the display area.

[0057] In the above embodiments, Figure 3 The driving circuit shown uses transistors as the first control switch T8 and the second control switch T7. In another embodiment, the first control switch T8 and the second control switch T7 can also be diodes, as shown below. Figure 6As shown. In this embodiment, the control terminal of the first control switch T8 is connected to its first path terminal, and the control terminal of the second control switch T7 is also connected to its first path terminal.

[0058] In this embodiment, since the first control switch T8 and the second control switch T7 are connected by diodes, the voltages of nodes PU1 and PU2 no longer rely entirely on an externally fixed high voltage (VGH) to maintain their on-state. Instead, they can be dynamically adjusted by the external voltage of the diodes, resulting in a larger driving voltage swing. This provides stronger driving capability for the touch unit and effectively improves signal quality. Furthermore, the diode connection eliminates the need for additional gate control traces, making the layout of the first control switch T8 and the second control switch T7 more compact. This helps to further narrow the bezel and adapt to the requirements of ultra-narrow bezel display panels. Specifically, setting the first control switch T8 and the second control switch T7 as diode structures not only improves driving capability but also simplifies circuit design and enhances stability.

[0059] Experiments have shown that the driving circuit of this application can increase the Vgs voltage amplitude of the first detection switch T1 and the second detection switch T2 by 2~5V, reduce the on-resistance of the transistor by half, and more than double the overcurrent capability, thus solving the problems of high impedance and insufficient overcurrent capability in the existing 4T structure design. Simultaneously, by alternately turning on the first detection switch T1 and the second detection switch T2 in adjacent display stages, right-biased characteristics are suppressed, and the threshold voltage drift is controlled within ±0.2V, ensuring long-term operational stability.

[0060] See Figure 7 , Figure 7 This is a schematic diagram of the structure of an embodiment of the display panel of this application. The display panel 70 includes: a driving circuit 71 and a driving control unit 72. The driving circuit 71 includes the driving circuit of the display panel described above. The driving control unit 72 includes a detection terminal SX and a common voltage terminal SX_DUM. The detection terminal SX is connected to a control signal detection unit, and the common voltage terminal is connected to a common signal transmission unit.

[0061] The display panel of this application is as described above. Figure 3 or Figure 6 The structure shown is compatible with the existing 4T structure process. The newly added transistors (T5, T6, T7, T8) and capacitors (C1, C2) are all located in the non-transparent connection zone between the Touch area and the Display area. The transistor size, wiring method and SX and SX-DUM signal traces are compatible with the existing IGZO array substrate process. They can be integrated by simply optimizing the layout, without occupying the pixel light-transmitting area or increasing mass production costs.

[0062] The display panel of this application can be directly applied to high-end consumer electronics, automotive displays, industrial touch control and other fields with stringent requirements for impedance characteristics, overcurrent capability and long-term reliability.

[0063] The above are merely embodiments of the present invention and do not limit the scope of patent protection of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A driving circuit for a display panel, characterized in that, include: A touch driving unit and an auxiliary driving unit are provided. The touch driving unit includes a touch unit, a touch signal detection unit, and a common signal transmission unit. The touch signal detection unit and the common signal transmission unit are respectively connected to the touch unit. The touch signal detection unit is used to connect to the detection terminal of the driving control unit, and the common signal transmission unit is used to connect to the common voltage terminal of the driving control unit. The touch signal detection unit includes: a first detection switch and a second detection switch; The first terminal of the first detection switch is connected to the touch unit, and the second terminal of the first detection switch is connected to the detection terminal of the drive control unit; the first terminal of the second detection switch is connected to the touch unit, and the second terminal of the second detection switch is connected to the detection terminal of the drive control unit. The auxiliary drive unit is connected to the control terminals of the first detection switch and the second detection switch, and is used to regulate the voltage of the control terminals of the first detection switch and / or the second detection switch; The auxiliary driving unit includes: a gate voltage regulation unit and a reset auxiliary unit; The gate voltage regulation unit is connected to the control terminal of the first detection switch and the control terminal of the second detection switch, and is also connected to the first voltage input terminal, for regulating the voltage of the control terminals of the first detection switch and / or the second detection switch using the first voltage provided by the first voltage input terminal; The reset auxiliary unit is connected to the control terminal of the first detection switch and the control terminal of the second detection switch, and is also connected to the second voltage input terminal. It is used to regulate the voltage of the control terminals of the first detection switch and / or the second detection switch using the second voltage provided by the second voltage input terminal; wherein the first voltage is greater than the second voltage.

2. The driving circuit according to claim 1, characterized in that, The gate voltage regulation unit includes: a first gate voltage regulation unit and a second gate voltage regulation unit; The first gate voltage regulation unit is connected to the control terminal of the first detection switch and to the first voltage input terminal, and is used to regulate the voltage of the control terminal of the first detection switch using the first voltage; the second gate voltage regulation unit is connected to the control terminal of the second detection switch and to the first voltage input terminal, and is used to regulate the voltage of the control terminal of the second detection switch using the first voltage.

3. The driving circuit according to claim 2, characterized in that, The first gate voltage regulation unit includes: a first regulation switch and a first energy storage capacitor; The first path terminal of the first control switch is connected to the first voltage input terminal to receive the first voltage; the second path terminal of the first control switch is connected to the control terminal of the first detection switch to receive the first control signal; the first terminal of the first energy storage capacitor is connected to the first path terminal of the first detection switch, and the second terminal of the first energy storage capacitor is connected to the control terminal of the first detection switch. The second gate voltage regulation unit includes: a second regulation switch and a second energy storage capacitor; The first path terminal of the second control switch is connected to the first voltage input terminal to receive the first voltage; the second path terminal of the second control switch is connected to the control terminal of the second detection switch to receive the second control signal; the first terminal of the second energy storage capacitor is connected to the first path terminal of the second detection switch, and the second terminal of the second energy storage capacitor is connected to the control terminal of the second detection switch. The first control switch and the second control switch are MOSFETs or diodes.

4. The driving circuit according to claim 3, characterized in that, The reset auxiliary unit includes: a first reset unit and a second reset unit; The first reset unit is connected to the control terminal of the first detection switch and to the second voltage input terminal, and is used to regulate the voltage of the control terminal of the first detection switch using the second voltage; The second reset unit is connected to the control terminal of the second detection switch and the second voltage input terminal, and is used to regulate the voltage of the control terminal of the second detection switch using the second voltage.

5. The driving circuit according to claim 4, characterized in that, The first reset unit includes: a first reset switch, a first path terminal of the first reset switch connected to the control terminal of the first detection switch, a second path terminal of the first reset switch connected to the second voltage input terminal to receive the second voltage, and the control terminal of the first reset switch receiving a third control signal; The second reset unit includes: a second reset switch; the first path terminal of the second reset switch is connected to the control terminal of the second detection switch, the second path terminal of the second reset switch is connected to the second voltage input terminal to receive the second voltage, and the control terminal of the second reset switch receives a fourth control signal.

6. The driving circuit according to claim 4, characterized in that, The common signal transmission unit includes: a first transmission switch and a second transmission switch; The first path terminal of the first transmission switch is connected to the common voltage terminal, and the second path terminal of the first transmission switch is connected to the touch unit. The control terminal of the first transmission switch receives a fifth control signal. The first path terminal of the second transmission switch is connected to the common voltage terminal, and the second path terminal of the second transmission switch is connected to the touch unit. The control terminal of the second transmission switch receives a sixth control signal.

7. The driving circuit according to claim 6, characterized in that, In response to a display command, the first gate voltage control unit controls the first detection switch to be in the on state during the display period, and the second gate voltage control unit controls the second detection switch to be in the on state during the display period; and the first transmission switch and the second transmission switch are in the on state during the display period. or In response to a display command, the second gate voltage control unit controls the second detection switch to be in the on state during a first display time period, and the second transmission switch is in the on state during the first display time period; the first gate voltage control unit controls the first detection switch to be in the on state during a second display time period, and the first transmission switch is in the on state during the second display time period; wherein, the first display time period corresponds to the nth display stage, and the second display time period corresponds to the (n+m)th display stage.

8. The driving circuit according to claim 6, characterized in that, In response to a touch command, the first energy storage capacitor is in a charging state during the first pre-charging phase; In the first convergence phase, the detection terminal and the common voltage terminal provide convergence signals, the first energy storage capacitor is in a discharging state, the first detection switch is kept on, and the convergence signal provided by the detection terminal is transmitted to the first touch pad of the touch unit; the first transmission switch is in a conducting state, and the convergence signal provided by the common voltage terminal is transmitted to the second touch pad of the touch unit; the second reset unit is in a first working state, and the second detection switch is kept off; In the first detection phase, the first energy storage capacitor is in a discharging state, keeping the first detection switch on, and driving the control unit to detect the first touch signal of the first touch pad using the detection terminal; During the second pre-charge phase, the second energy storage capacitor is in a charging state; In the second convergence phase, the detection terminal and the common voltage terminal provide convergence signals, the second energy storage capacitor is in a discharging state, the second detection switch is kept on, and the convergence signal provided by the detection terminal is transmitted to the second touch pad of the touch unit; the second transmission switch is in a conducting state, and the convergence signal provided by the common voltage terminal is transmitted to the first touch pad of the touch unit; the first reset unit is in a first working state, and the first detection switch is kept off. During the second detection phase, the second energy storage capacitor is in a discharging state, keeping the second detection switch on, and driving the control unit to detect the second touch signal of the second touch pad using the detection terminal.

9. A display panel, characterized in that, include: The driving circuit includes the driving circuit of the display panel as described in any one of claims 1 to 8. The drive control unit includes a detection terminal and a common voltage terminal. The detection terminal is connected to a control signal detection unit, and the common voltage terminal is connected to a common signal transmission unit.

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