Read-write method and read-write device of dot matrix type liquid crystal display (LCD)

Abstract

The invention discloses a read-write method and a read-write device of a dot matrix type liquid crystal display (LCD). The read-write method includes the steps of dividing the LCD into a preset number of display areas, allocating a different number to each area, marking the position coordinate of each pixel point in each display area and the pixel range of each display area, calculating the storage capacity of a video memory corresponding to each display area according to the pixel range of the display area, arranging a buffer storage area with a size corresponding to the storage capacity on a buffer area, and utilizing video memory data corresponding to each display area to renew the content of the buffer storage area. Through utilizing the read-write method and the read-write device of the dot matrix type LCD and combining the advantages of full-screen reading and writing and reading and writing according to bytes, storage resources of the buffer area are saved and reaction speed is fast. Especially when frequent read-write operation is carried out, the read-write method and the read-write device of the dot matrix type LCD are high in efficiency.

Description

technical field [0001] The invention relates to a read-write technology of a display, in particular to a method and a device for reading and writing a dot-matrix liquid crystal display. Background technique [0002] Dot-matrix LCDs are widely used. For example, in system environment monitoring, such a dot-matrix LCD is usually required to display system parameters (fan, temperature, voltage, etc.) abnormal. Its display principle is also relatively simple. There is a video memory inside the display (dot-matrix liquid crystal display for short, the same below). Updating the content of the video memory means updating the display on the interface. The memory capacity size is related to the specific resolution size. For example, the commonly seen 128x64 means that the dot matrix has 64 rows, and each row has 128 pixels, so there are 64x128 pixels in total. Each byte of the video memory corresponds to 8 pixels one by one, that is to say, each bit of the byte represents a pixel....

AI Technical Summary

Problems solved by technology

The disadvantage is that because the read and write of each byte must be written to the address first, the speed is very slow when there are many updates

In extreme cases, updating the entire screen content takes the most time

Images