Control method for preventing liquid crystal display from being blurred

Abstract

The invention discloses a control method for preventing a liquid crystal display from being blurred. By adding a ping-pong first input-first output queue, a buffering data size is increased. Meanwhile, by controlling clock divider count, scanning cycles are increased so that the number of transmission data is always larger than the number of read data. According to actual demands, a standard that an actual visual effect can not be influenced is adopted, and by decreasing a part of frame numbers or at the cost of increasing parts of the scanning cycles, actual images are smooth. Blurring and distortion or hysteresis of the images can not happen, the situation that data underflow occurs when the liquid crystal display (LCD) displays is avoided, and the data underflow means blurring and distortion.

Description

technical field [0001] The invention belongs to the field of digital integrated circuits, and relates to a design method of a liquid crystal display controller. Background technique [0002] LCD is the abbreviation of liquid crystal display. With the continuous development and maturity of technology, LCD has already replaced the traditional CRT (cathode ray tube) display, and the price has dropped a lot. It has become the mainstream of display and is widely used. LCDC is the abbreviation of lcd control (liquid crystal display controller). Its main functions include receiving the display data transmitted from FIFO (first-in-first-out queue) or data channel, superimposing and combining in a certain way, and finally The image is sent to the external LCD for display, and its interface includes the input interface of each layer of FIFO and the LCD output interface. The role of the LCD controller in an embedded system is equivalent to that of a graphics card in a computer system....

AI Technical Summary

Problems solved by technology

At present, because embedded systems have higher requirements on performance and power consumption, and the processing tasks and real-time requirements are getting higher and higher, so when the entire system is working, especially when the CPU (central processing unit) is busy processing tasks of other modules Or when the screen resolution to be displayed is too high and the amount of data is too large, the LCD controller may not be able to receive the data to be displayed in time, that is, the DMA (direct memory access) or data channel cannot transfer the data to the LCD controller in time , since the LCD controller scans the data input into the FIFO to the display, the data to be read in the FIFO is not ready at this time, which may cause data underflow in the display screen at this time, that is, blurred screen distortion

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