CN-122024668-A - Driving method, driving circuit and display device of display panel

CN122024668ACN 122024668 ACN122024668 ACN 122024668ACN-122024668-A

Abstract

The invention provides a driving method, a driving circuit and a display device of a display panel, wherein in the driving method of the display panel, positive polarity gray scale voltage and negative polarity gray scale voltage are alternately output to a pixel unit in each display frame, the polarity alternating driving mode can reduce the ageing of liquid crystal molecules, meanwhile, the charge loss caused by the leakage current of a thin film transistor is compensated by inserting target gray scale voltage with the same polarity as that of the next frame between adjacent display frames, the design cost and the power consumption are reduced without adding extra hardware, the compensation of the leakage current can be realized only through time sequence optimization, the problems of residual shadow, flicker, contrast reduction and the like are effectively improved, and the display image quality is improved.

Inventors

YANG YANG
Zhou mancheng
ZHU ZIHENG
XU PEI

Assignees

惠科股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260330

Claims (10)

1. The driving method of the display panel comprises a plurality of columns of data lines, a plurality of rows of scanning lines and pixel units arranged in an array, wherein the pixel units are connected with a corresponding data line and a scanning line, and the driving method of the display panel is characterized by comprising the following steps: In each display frame, alternately outputting positive polarity gray scale voltages and negative polarity gray scale voltages to the pixel units through the data lines; And outputting a target gray-scale voltage to the pixel unit through the data line between adjacent display frames, wherein the polarity of the target gray-scale voltage is the same as that of the gray-scale voltage of the next frame.
2. The method of driving a display panel according to claim 1, further comprising, before said outputting a target gray-scale voltage to said pixel unit between adjacent display frames: acquiring the current display frequency of the display panel, and comparing the display frequency with a frequency threshold; When the display frequency does not reach the frequency threshold, setting the target gray scale voltage as a first target gray scale voltage; When the display frequency reaches the frequency threshold, setting the target gray-scale voltage as a second target gray-scale voltage, wherein the gray-scale value of the first target gray-scale voltage is smaller than that of the second target gray-scale voltage.
3. The driving method of a display panel according to claim 2, wherein the driving method of a display panel further comprises: Controlling the display panel to alternately work at a first display frequency and a second display frequency according to a mode control signal, wherein the first display frequency is smaller than the frequency threshold value, and the second display frequency is larger than the frequency threshold value; And outputting the target gray scale voltage to the pixel unit as the first target gray scale voltage between adjacent display frames.
4. The method of driving a display panel according to claim 3, wherein the first target gray scale voltage has a gray scale value of 0 and the second target gray scale voltage has a gray scale value of 255.
5. The method of claim 4, wherein the frequency threshold is 50hz to 70hz.
6. The driving method of a display panel according to claim 1, wherein the inserting timing of the target gray scale voltage is controlled to be in an intermediate period of a vertical retrace synchronous interval.
7. The driving method of a display panel according to claim 1, wherein the driving method of a display panel further comprises: in each display frame, outputting a line scanning signal to each pixel unit line by line through the scanning line; and between adjacent display frames, cutting off output row scanning signals to the scanning lines.
8. The utility model provides a drive circuit of display panel, display panel includes the pixel unit that many columns of data lines, many rows of scanning lines and array were arranged, the pixel unit with correspond one data line and a scanning line are connected, its characterized in that, display panel's drive circuit includes: The grid driving circuit is connected with the multi-row scanning lines of the display panel and is used for outputting row scanning signals in a controlled manner or cutting off the row scanning signals; The source electrode driving circuit is connected with the multi-column data lines of the display panel and is used for outputting gray scale voltages with corresponding magnitudes and polarities in a controlled manner; the timing controller is respectively connected with the gate driving circuit and the source driving circuit, and is used for controlling the gate driving circuit and the source driving circuit to realize the driving method of the display panel according to any one of claims 1-7.
9. The display panel driving circuit of claim 8, wherein the timing controller comprises: A polarity detection unit for detecting the polarity of the pixel unit of the current display frame and the polarity of the next display frame; the frequency detection unit is used for acquiring the current display frequency of the display panel; The control unit is respectively connected with the polarity detection unit and the frequency detection unit and is used for controlling the grid driving circuit and the source driving circuit to output a row scanning signal and a gray scale voltage corresponding to the display frequency to the pixel units in the corresponding display frames according to the display frequency; And controlling the source electrode driving circuit to output target gray scales with corresponding polarities and gray scale values to the pixel units according to the display frequency and the polarity change of the pixel units.
10. A display device comprising a display panel and the drive circuit of the display panel according to claim 9, wherein the drive circuit of the display panel is connected to the display panel.

Description

Driving method, driving circuit and display device of display panel Technical Field The present invention relates to a driving method, a driving circuit and a display device for a display panel. Background In the field of liquid crystal display technology, a thin film transistor liquid crystal display is widely used in various electronic products such as televisions, displays, mobile devices and the like due to its mature manufacturing process and excellent display performance. The basic operating principle of the thin film transistor-LCD is to control the data voltage to charge the liquid crystal capacitance of each pixel by using the thin film transistor as a switch, thereby changing the arrangement state of liquid crystal molecules to modulate backlight transmission, and forming an image. The main body of the technology is mainly composed of a pixel array arranged in a matrix form, a grid driving circuit for providing scanning signals, a source driving circuit for providing data voltages and a timing control unit. With the development of display technology to higher resolution, higher refresh rate and lighter and thinner, higher requirements are put on the maintenance accuracy and stability of pixel voltages. However, due to the physical characteristics of the tft itself as a semiconductor device, when the tft is turned off as a switch, the source and the drain are not ideally insulated from each other, and there is a small leakage current, which directly affects the ability of the pixel voltage to remain in the frame period, and thus becomes an intrinsic bottleneck for restricting further improvement of the picture quality. However, the conventional improvement in the existing or mainstream technology mainly focuses on two directions, namely, starting from the physical level of the device, attempting to radically reduce the generation of leakage current by using semiconductor materials with higher mobility or lower defect density (such as oxide semiconductors instead of conventional amorphous silicon) or optimizing the thin film transistor manufacturing process, and adding additional compensation transistors or storage capacitors to enhance the voltage holding capability or provide internal compensation at the design level of the pixel circuit. The method has obvious defects that the improvement of materials and processes is often accompanied with the obvious increase of manufacturing cost, and the improvement of inherent physical effects such as subthreshold leakage current and the like is limited, and the addition of a compensation circuit in a pixel occupies precious pixel opening area, so that the light transmittance of the panel is reduced, backlight with higher power is required for realizing high brightness, the overall power consumption is further increased, and meanwhile, the complexity of a driving time sequence and the difficulty of yield control are also improved due to the complicated pixel design. Therefore, these prior art solutions often introduce new problems of cost, power consumption or process complexity while improving the leakage problem, and it is difficult to achieve a good balance between ensuring display performance and controlling the overall cost. Disclosure of Invention The invention aims to provide a driving method of a display panel, which aims to solve the problems of high cost and high power consumption of the traditional leakage current compensation mode. The first aspect of the embodiment of the present invention provides a driving method of a display panel, where the display panel includes a plurality of columns of data lines, a plurality of rows of scan lines, and pixel units arranged in an array, and the pixel units are connected to a corresponding one of the data lines and a corresponding one of the scan lines; the driving method of the display panel comprises the following steps: In each display frame, alternately outputting positive polarity gray scale voltages and negative polarity gray scale voltages to the pixel units through the data lines; And outputting a target gray-scale voltage to the pixel unit through the data line between adjacent display frames, wherein the polarity of the target gray-scale voltage is the same as that of the gray-scale voltage of the next frame. Optionally, before the outputting the target gray scale voltage to the pixel unit between the adjacent display frames, the method further includes: acquiring the current display frequency of the display panel, and comparing the display frequency with a frequency threshold; When the display frequency does not reach the frequency threshold, setting the target gray scale voltage as a first target gray scale voltage; When the display frequency reaches the frequency threshold, setting the target gray-scale voltage as a second target gray-scale voltage, wherein the gray-scale value of the first target gray-scale voltage is smaller than that of the second target gray-scale voltage. Optionally, the d