A panel driving circuit supporting high refresh rate display technology

Abstract

The present invention discloses a panel driving circuit supporting a high refresh rate display technology, comprising a driving module, a voltage stabilizing module and a frequency conversion module. The driving circuit of the frequency conversion module is composed of two elements and three input signals, wherein the two elements are an N-type TFT and a P-type TFT, and the three input signals are VSS, FRSW and VSSL. The source of the N-type TFT is electrically connected to VSSL, and the gate is used to receive a first control signal FRSW. The drain of the N-type TFT is electrically connected to the voltage stabilizing module, the source of the P-type TFT is electrically connected to VSS, the drain of the P-type TFT is electrically connected to the voltage stabilizing module, and the gate is used to receive a second control signal FRSW. The voltage stabilizing module is provided with two signal receiving ports for transmitting signals through the frequency conversion module, so as to reduce the risk of pixel leakage and display degradation under the premise of only increasing the leakage time.

Description

Technical Field

[0001] The present invention belongs to the field of display technology, and in particular relates to a panel driving circuit supporting high refresh rate display technology. Background Art

[0002] High refresh rate display technology can make dynamic image switching smoother, and provide a better gaming and film experience. However, as the display refresh rate increases, it poses certain challenges to the LCD panel itself, such as the need to optimize the drive circuit, the need to select faster LCDs, and increased panel power consumption. In addition, when implementing dynamic refresh rate adjustment, the terminal often uses a method of keeping the display time fixed and then increasing or decreasing the blank time to achieve the purpose of frequency conversion.

[0003] There is an LCD display panel that supports a refresh rate of up to 120Hz and a resolution of HD+ (720RGB*1640). Its frame time is 8.3ms, the effective display time is 6.6ms, and the blank time is 1.7ms. When it switches to 90Hz display, the frame time is 11.1ms, the effective display time is still 6.6ms, and the blank time increases to 4.5ms. When it switches to 60Hz display, the frame time is 16.7ms, the effective display time is still 6.6ms, and the blank time increases to 10.1ms. When it switches to 30Hz, the frame time is 33.3ms, the effective display time is still 6.6ms, and the blank time increases to 26.7ms, as shown in the attached manual. Figure 3 The LCD panel displays dynamic frequency conversion data.

[0004] However, there are still the following shortcomings: Although this solution can easily achieve the purpose of dynamic frequency conversion, when switching to low-frequency operation, the blank time is prolonged, which will cause the pixel voltage to be maintained for a longer time, increasing the risk of leakage and affecting the accuracy of data display, thereby affecting the brightness and color effects of displays with different refresh rates. Summary of the invention

[0005] The object of the present invention is to provide a panel driving circuit supporting high refresh rate display technology to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a panel driving circuit supporting high refresh rate display technology, comprising a driving module, a voltage stabilizing module and a frequency conversion module, wherein the driving circuit of the frequency conversion module is composed of two elements and three input signals, wherein the two elements are an N-type TFT and a P-type TFT, and the three input signals are VSS, FRSW and VSSL, respectively. The source of the N-type TFT is electrically connected to VSSL, and the gate is used to receive a first control signal FRSW, the drain of the N-type TFT is electrically connected to the voltage stabilizing module, the source of the P-type TFT is electrically connected to VSS, the drain of the P-type TFT is electrically connected to the voltage stabilizing module, and the gate is used to receive a second control signal FRSW, the voltage stabilizing module is provided with two signal receiving ports for transmitting signals through the frequency conversion module, the voltage stabilizing module provides low-level support for the GOUT output of the driving module, the voltage stabilizing module is electrically connected to the driving module and supplies power to the driving module, and the frequency conversion module improves the shutdown voltage of the Gate signal required for the in-plane pixel TFT action, and the driving module comprises four ports, and the four ports are STV, RST, CLK and GOUT, respectively.

[0007] As a further optimization of the technical solution, the FRSW is at a low level when operating at a high frequency of 90Hz. At this time, the low level of the Gate signal is controlled by VSS, confirming that when the leakage time becomes longer, a lower voltage is used to turn off the pixel TFT to prevent pixel leakage.

[0008] As a further optimization of the technical solution, the FRSW is at a high level when operating at a low frequency of 60 Hz. At this time, the low level of the Gate signal is controlled by a lower VSSL, so that the TFT can be turned off with a lower voltage when the leakage time increases to prevent leakage.

[0009] As a further optimization of the technical solution, the driving module is connected to the STV interface end, and the STV interface end is used to scan the input signal of the driving module.

[0010] As a further optimization of the technical solution, the driving module is connected to the RST interface terminal and the CLK interface terminal respectively, the CLK interface terminal is used for the driving module to control the signal input time, and the RST interface terminal is used for the driving module to initialize the signal in the circuit.

[0011] As a further optimization of the technical solution, the driving module is connected to the GOUT interface end, and the GOUT interface end is used for driving module signal output.

[0012] Technical effects and advantages of the present invention: The panel driving circuit supporting high refresh rate display technology adds a frequency conversion module on the basis of the traditional driving module and the voltage stabilizing module. The driving circuit of the frequency conversion module is composed of two components and three input signals, wherein the two components are N-type TFT and P-type TFT, and the three input signals are VSS, FRSW and VSSL, wherein FRSW is used to adjust the frequency of the frame number. FRSW is at a low level when operating at a high frequency of 90Hz, and the low level of the Gate signal is controlled by VSS. FRSW is at a high level when operating at a high frequency of 60Hz, and the low level of the Gate signal is controlled by VSSL.

[0013] The frequency conversion module of the panel drive circuit can be composed of more groups of TFT switches, which can meet the dynamic switching of high refresh panels at different refresh rates. Under the premise of only increasing the blank time (extending the leakage time), the risk of pixel leakage and display degradation is reduced. When different refresh rates are used, the leakage time of the LCD display is different, and the low frequency leakage time is longer than the high frequency leakage time. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a driving circuit diagram of the present invention;

[0015] Figure 2 This is a timing diagram of the frequency conversion module operation of the present invention;

[0016] Figure 3 This is a diagram showing the dynamic frequency conversion data of the liquid crystal display panel of the present invention.

[0017] In the figure: 1. Drive module; 2. Voltage stabilization module; 3. Frequency conversion module. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Please refer to Figure 1The present invention provides a technical solution: a panel driving circuit supporting high refresh rate display technology, comprising a driving module 1, a voltage stabilizing module 2 and a frequency conversion module 3, wherein the driving circuit of the frequency conversion module 3 is composed of two components and three input signals, wherein the two components are an N-type TFT and a P-type TFT, the three input signals are VSS, FRSW and VSSL, the source of the N-type TFT is electrically connected to VSSL, the gate is used to receive a first control signal FRSW, the drain of the N-type TFT is electrically connected to the voltage stabilizing module 2, the source of the P-type TFT is electrically connected to VSS, the drain of the P-type TFT is electrically connected to the voltage stabilizing module 2, the gate is used to receive a second control signal FRSW, the voltage stabilizing module 2 is provided with two signal receiving ports for transmitting signals through the frequency conversion module 3, the voltage stabilizing module 2 is a driving module The GOUT output of block 1 provides low-level support, the voltage stabilizing module 2 is electrically connected to the driving module 1 and supplies power to the driving module 1, the frequency conversion module 3 improves the shutdown voltage of the Gate signal required for the in-plane pixel TFT action, the driving module 1 includes four ports, and the four ports are STV, RST, CLK and GOUT, the driving module 1 is connected to the STV interface end, the STV interface end is used to scan the input signal of the driving module 1, the driving module 1 is respectively connected to the RST interface end and the CLK interface end, the CLK interface end is used for the driving module 1 to control the signal input time, the RST interface end is used for the driving module 1 to initialize the signal in the circuit, the driving module 1 is connected to the GOUT interface end, and the GOUT interface end is used for the signal output of the driving module 1.

[0020] As attached Figure 2 As shown, when operating at a high frequency of 90Hz, FRSW is at a low level, and the low level of the Gate signal is controlled by VSS. When operating at a low frequency of 60Hz, FRSW is at a high level, and the low level of the Gate signal is controlled by a lower VSSL. VSS is used to convert the voltage stabilizing module 2 through the frequency conversion module 3.

[0021] The panel driving circuit supporting high refresh rate display technology is a driving circuit used in existing liquid crystal displays according to the two circuit modules of the driving module 1 and the voltage stabilizing module 2. It can be a 7T1C circuit or a 13T1C circuit. The output waveform of the traditional GIP circuit is easily affected by the leakage of transistors (especially depletion-type transistors), which causes the output waveform of the GIP circuit to be distorted. The distorted output waveform will cause problems in turning on and off the transistors in the display area of ​​the display screen, resulting in abnormal display of the display screen. Therefore, a 7T1C circuit or a 13T1C circuit is selected. The frequency conversion module 3 is composed of 2 components and 3 input signals. According to the refresh rate used, the control signal FRSW outputs a high level or a low level to provide VSS or VSSL to the voltage stabilizing circuit. The purpose is to provide a lower level off-state voltage at low frequency display through the selection of FRSW to reduce the leakage risk of the pixels in the surface.

[0022] For details, please refer to Figure 1 , which is a stage in the Gate driving circuit of the in-plane pixel TFT. Different from the ordinary design, the circuit of this technical solution not only retains the original driving module 1 and the voltage stabilizing module 2, but also adds a frequency conversion module 3.

[0023] For details, please refer to Figure 2 The frequency conversion module of the present invention can be composed of more groups of TFT switches, and is not limited to the embodiment. When dynamic changes of three refresh rates of 120Hz / 90Hz / 60Hz are required, three low-level voltages can be used to drive separately;

[0024] This technical solution will propose a new panel driving circuit, so that when the high refresh panel performs dynamic frequency conversion, the pixel voltage retention ability can be better guaranteed, so that the proper brightness and color level can still be maintained during a longer blank time.

[0025] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A panel driving circuit supporting high refresh rate display technology, comprising a driving module (1), a voltage stabilizing module (2) and a frequency conversion module (3), characterized in that: The drive circuit of the frequency conversion module (3) is composed of two elements and three input signals, wherein the two elements are an N-type TFT and a P-type TFT, and the three input signals are VSS, FRSW and VSSL, respectively. The source of the N-type TFT is electrically connected to VSSL, and the gate is used to receive a first control signal FRSW, the drain of the N-type TFT is electrically connected to the voltage stabilizing module (2), the source of the P-type TFT is electrically connected to VSS, the drain of the P-type TFT is electrically connected to the voltage stabilizing module (2), and the gate is used to receive a second control signal FRSW, the voltage stabilizing module (2) is provided with two signal receiving ports for transmitting signals through the frequency conversion module (3), the voltage stabilizing module (2) provides low-level support for the GOUT output of the drive module (1), the voltage stabilizing module (2) is electrically connected to the drive module (1) and supplies power to the drive module (1), the frequency conversion module (3) improves the turn-off voltage of the Gate signal required for the in-plane pixel TFT to operate, and the drive module (1) includes four ports, and the four ports are STV, RST, CLK and GOUT respectively; The FRSW is at a low level when operating at a high frequency of 90 Hz, and the low level of the Gate signal is controlled by VSS; The FRSW is at a high level when operating at a low frequency of 60 Hz, and the low level of the Gate signal is controlled by VSSL; The driving module (1) is connected to the STV interface end, and the STV interface end is used to scan the input signal of the driving module (1); The driving module (1) is connected to the RST interface end and the CLK interface end respectively, the CLK interface end is used for the driving module (1) to control the signal input time, and the RST interface end is used for the driving module (1) to initialize the signal in the circuit; The driving module (1) is connected to a GOUT interface end, and the GOUT interface end is used for signal output of the driving module (1).

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