Method and display device for adjusting screen refresh rate

Abstract

The invention provides a method for adjusting a screen refresh rate and a liquid crystal display device (LCD). The method comprises the steps: in the process of reading image data to a frame buffer (FB) module, calculating the refresh rate that the image data are read into the FB module; writing the calculated refresh rate into an LCD driving program of the LCD; and reading the image data from the FB module to the LCD through the refresh rate which is written into the LCD driving program. According to the method for adjusting the screen refresh rate and the liquid crystal display device, a load and power consumption of the device can be reduced.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a method for adjusting screen refresh rate and a liquid crystal display device. Background technique [0002] The display process is roughly divided into two parts, 1: The application program rotates, scales, and superimposes the source image data (such as png, jpeg images) to form the target display image data, and then reads it into the frame buffer module (Framebuffer, FB) Waiting for display; 2: The graphics display chip reads the image data in the FB to the liquid crystal display (LCD) terminal through the display interface (such as RGB, MIPI), and the display interface works at a certain frequency, usually in the system initialization It is fixed at the frequency required by 60fps; but in the display process, due to the limitation of the software algorithm, the refresh rate at which the application program reads the display image data into the FB often does not reach 60fps...

AI Technical Summary

Problems solved by technology

[0002] The display process is roughly divided into two parts, 1: The application program rotates, scales, and superimposes the source image data (such as png, jpeg images) to form the target display image data, and then reads it into the frame buffer module (Framebuffer, FB) Waiting for display; 2: The graphics display chip reads the image data in the FB to the liquid crystal display (LCD) terminal through the display interface (such as RGB, MIPI), and the display interface works at a certain frequency, usually in the system initialization It is fixed at the frequency required by 60fps; but in the display process, due to the limitation of the software algorithm, the refresh rate at which the application program reads the display image data into the FB often does not reach 60fps (abbreviation of "Framepersecond", Chinese is: The number of frames read per second), for example, the average refresh rate of lanucher's fast sliding is only 30fps; the refresh rate of playing video is usually 30fps; the refresh rate is lower when reading e-books; The refresh rate of the process of reading data to the LCD is a fixed value of 60fps

It can be seen that at present, the refresh rate of the image data refreshed by the application program to the FB is lower than 60fps, while the refresh rate of the image data from the FB to the LCD is fixed at 60fps, which leads to the process of reading the image data from the FB to the LCD. Additional processing of certain image data increases the load and power consumption of the device. For example, the actual refresh rate of the software is 40fps, but the refresh rate of the hardware interface is fixed at 60fps, and 20fps of data is repeated data. If the hardware refresh rate is reduced to 40fps , taking playing video as an example, the average current drops by about 14.3%, taking the main interface as an example, the average current drops by about 23.7%

Images