LCM Driver Interface

LCM provides users with a standard LCD display driver interface (there are different types of 4-bit, 8-bit, VGA, etc.), and users can operate according to the interface requirements to control the correct display of the LCD. Compared with glass, LCM is a more integrated LCD product.

For small-size LCD display, LCM can be easily connected with various microcontrollers (such as microcontrollers). However, for large-size or color LCD displays, generally take up a considerable portion of the control system's resources or cannot be controlled at all, such as 320×240256 color LCM, displayed at 20 fields/second (that is, 1 second full screen refresh display 20 times), and the amount of data transmitted in one second is as high as: 320×240×8×20=11.71875Mb or 1.465MB, if the standard MCS-51 series MCU processing, assuming the repeated use of MOVX instructions to continuously transmit these data, considering the address calculation time, at least need to connect to the 421.875MHz clock to complete the data transmission. This shows the huge amount of data being processed.

The resolution of the fax is the scanning density, the higher the resolution represents the higher the accuracy of the scan, which can be divided into vertical resolution and horizontal resolution. Vertical resolution refers to the number of pixels per millimeter displayed on a vertical horizontal line, and horizontal resolution refers to the number of pixels per millimeter displayed on a parallel horizontal line.

According to the international standard of three types of fax machines, the horizontal resolution is 8 pixels /mm, so the resolution of the fax machine is generally expressed as 8 pixels /mm× vertical pixels /mm, generally we will save the horizontal resolution, only the vertical resolution to represent the resolution. Vertical resolution is mainly standard 3.85 pixels /mm, fine 7.7 pixels /mm, hyperfine 15.4 pixels /mm three kinds.