Search

CN-121999735-A - Voltage regulation method and system based on display frame changing and speed changing

CN121999735ACN 121999735 ACN121999735 ACN 121999735ACN-121999735-A

Abstract

The invention discloses a voltage regulation method and system based on display frame changing and speed changing, and relates to the technical field of various displays. The method comprises a frame changing rate detection module, a gray voltage regulation module and a gray voltage output module, wherein the frame changing rate detection module is used for detecting the frame changing speed of a picture, the detected frame changing rate is timely provided for the gray voltage regulation module, and corresponding gray voltage parameters are rapidly selected from an internal memory and provided for the gray voltage output module, so that zero time difference is achieved when the gray voltage output is detected from the frame changing rate, and abnormal pictures caused by too slow change of the corresponding gray voltage parameters due to data transmission of external gray voltage parameters in a conventional method are avoided. The invention uses a picture gray voltage regulating mode with a frame changing rate detecting module and a gray voltage regulating module, and effectively improves abnormal pictures brought by the display to human eyes under different frame changing rates on the basis of shortening the gray voltage switching time under the frame changing and speed changing and reducing the internal memory.

Inventors

  • JIN JINHUA
  • LI ZIXIN

Assignees

  • 西安泓森半导体有限公司

Dates

Publication Date
20260508
Application Date
20260305

Claims (7)

  1. 1. A voltage regulation method based on display frame change and speed change, comprising: receiving a picture enabling signal and a picture resetting signal from a display control unit, and obtaining a picture frame changing speed through a high-frequency clock generator of a display based on the picture enabling signal and the picture resetting signal; acquiring a comparison table of preset frame conversion speed and gray voltage parameters, and storing the comparison table into a local memory; And adjusting the gray voltage of the display according to the gray voltage parameter so as to enable the gray of the picture of the display to be normal.
  2. 2. The method of claim 1, wherein the picture reset signal is an end signal of completion of display of a frame, and the picture enable signal is a start signal of a frame.
  3. 3. The voltage regulation method based on display frame change speed according to claim 1, wherein the confirmation of the picture frame change speed comprises: When receiving a picture reset signal, pulling up a counting effective signal, and counting the rising edge of a CLK clock signal of a display based on a local D trigger; When receiving the picture reset signal, the counter finishes counting; And taking the clock times counted by the counter as the time length of preparation for picture switching, and obtaining the speed of picture frame switching based on the time length.
  4. 4. The voltage regulation method based on display frame changing and speed changing as claimed in claim 1, wherein the comparison table of frame rate and gray voltage parameters comprises more than 3 groups of gray voltage parameters suitable for different frame changing speeds, and the gray voltage parameters are used for realizing adaptation to a plurality of different frame changing speeds so as to ensure consistent optical display brightness; wherein the first set of gray is used to store system gray voltage parameters including reference, curve and polarity information; The other groups than the first group are used for storing the difference value from the first group of gray voltage parameters, wherein the difference value comprises a 3-bit offset difference value and a 1-bit sign bit of each gray voltage parameter of each group of frame changing speed.
  5. 5. The voltage regulating method based on display frame changing and speed changing according to claim 1, wherein the reference table is stored in a local memory to realize zero time difference, and gray voltage parameters are extracted from the memory according to the reference table.
  6. 6. The voltage adjustment method based on display frame conversion speed according to claim 1, wherein the determination of the gray voltage parameter corresponding to the frame conversion speed comprises: searching a comparison table of the frame changing speed and gray voltage parameters based on the frame changing speed information; Selecting gray voltage parameters corresponding to the frame rate conversion information through a built-in selector; Obtaining operation to be performed with a first group of complete gray voltage parameters through sign bits, wherein the sign bits are 1 to indicate that addition operation is required, and the sign bits are 0 to indicate that subtraction operation is required; The gray voltage parameter switching is completed through a built-in arithmetic unit, so that the gray voltage parameter is obtained, and the arithmetic unit comprises an adder and a subtracter.
  7. 7. A voltage regulation system based on display frame change and speed change, comprising: The frame conversion rate detection module is used for receiving a picture enabling signal and a picture resetting signal from the display control unit, and obtaining the frame conversion rate of a picture through a high-frequency clock generator of the display based on the picture enabling signal and the picture resetting signal; the gray voltage adjusting module is used for acquiring a comparison table of preset frame changing speed and gray voltage parameters, and storing the comparison table into the local memory; And the gray voltage output module is used for adjusting the gray voltage of the display according to the gray voltage parameter so as to enable the gray of the picture of the display to be normal.

Description

Voltage regulation method and system based on display frame changing and speed changing Technical Field The application relates to the technical field of various displays, in particular to a voltage regulating method and system based on display frame changing and speed changing. Background In conventional display technologies, a display generally receives and outputs a picture at a fixed standard refresh rate, and there is often a mismatch between the refresh rate and a frame rate output by a Graphics Processor (GPU), which is prone to causing phenomena such as picture tearing and jamming, and affects visual experience. Therefore, the industry proposes a frame-changing and speed-changing low-flash technology, so that the display can dynamically adjust the frame-changing speed according to the frame rate of an input signal, and realize the synchronization with the output frame rate of the GPU. The technology has important significance in the fields of dynamic content display and high-image-quality games, and can obviously improve the smoothness and the look and feel of pictures. In the frame-change and speed-change low-flash technical scheme, the time for displaying each frame is defined by a fixed data transmission time (related to the resolution of the display screen), and the frame-switch preparation time is different from frame to frame at different points (i.e. the time interval between the picture reset signal of the previous frame and the picture enable signal of the next frame is different, as shown in fig. 2). The data transmission time and the frame switching preparation time together form the time for displaying one frame (as shown in fig. 3), and the frame switching speeds are different due to different frame switching preparation times and different frame times. However, since the data transmission time corresponds to the charging time of the display device, the display device is in a leakage state during the preparation time for switching the picture due to the manufacturing process, when the charging time is fixed and the leakage time changes with the frame rate, the difference of the charge amounts at two ends of the display device is caused, so that abnormal phenomena such as inconsistent display brightness (as shown in fig. 4), occurrence of flash, uneven brightness or picture distortion (as shown in fig. 5) are caused, and the visual experience is seriously affected. In order to overcome the problems, the prior art proposes that when the frame changing speed of the next frame is detected to be different from that of the current frame, after the transmission of the previous frame is finished through an IIC protocol, a gray voltage parameter control signal required by the next frame is sent to a gray voltage regulating chip to regulate the output value of gray voltage, so that the voltage at two ends of a display is kept consistent after the display is subjected to electric leakage of different durations, and the aim of uniform display effect is achieved. However, this solution has the obvious disadvantage of requiring a long time to transmit a set of gray voltage parameters, for example at the usual 400K rate, typically over 600 microseconds, due to the complexity of the IIC protocol itself. In the actual display process, the time window available for adjusting the gray voltage through IIC is very short, generally only about 18 μs, and much lower than the time required for transmission from the completion of the frame conversion rate detection to the start of the charging of the next frame. Therefore, the gray voltage adjusting chip cannot complete voltage switching in time before the next frame of charging starts, so that the display device in the first half of the frame still charges according to the gray voltage of the previous frame, and the display device in the second half charges according to the adjusted voltage, so that uneven brightness of the upper part and the lower part in the same picture is caused. When the next frame is reached, the IIC transmission is finished, the whole screen is charged according to the new voltage, and the brightness of the whole screen is different from that of the previous frame, so that the problem of picture flickering is caused. In summary, the conventional scheme of adjusting gray voltage by using IIC protocol is difficult to complete switching of voltage parameters in a very short time, resulting in brightness layering and flickering of the picture, and cannot truly realize high-quality variable refresh rate display. Disclosure of Invention In view of the foregoing, it is desirable to provide a voltage regulation method based on display frame shifting. The technical scheme adopted in the specification is as follows: The specification provides a voltage regulation method based on display frame changing and speed changing, which comprises the following steps: receiving a picture enabling signal and a picture resetting signal from a display control u