Liquid crystal driving chip capable of reducing number of pins

Abstract

The invention discloses a liquid crystal driving chip capable of reducing the number of pins, and belongs to the technical field of liquid crystal driving chips. The liquid crystal driving chip capable of reducing the number of pins comprises an LCD drive and bias circuit, a display RAM, a time base generator, a serial interface module, a serial port module and a serial port module. The LCD driving and biasing circuit, the display RAM and the time base generator are all connected with the serial interface module; the display RAM is connected with the LCD driving and biasing circuit; the time base generator is connected with the LCD driving and biasing circuit, four male electrodes COM and twelve segment electrodes SEG are arranged on the LCD driving and biasing circuit, each male electrodeCOM corresponds to three paths of COM output ends, and each segment electrode SEG corresponds to one path of SEG output end. According to the liquid crystal driving chip capable of reducing the number of the pins, the number of the pins is reduced, and cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal driving chips, and in particular relates to a liquid crystal driving chip with reduced number of pins. Background technique [0002] The total number of segments driven by the liquid crystal driver chip is equal to the product of the number of COMs and the number of SEGs, and the number of pins driving the liquid crystal is equal to the sum of the number of COMs and the number of SEGs. Taking HT1621 as an example, the number of COMs is 4, the number of SEGs is 32, the total number of segments that can be driven is 4×32=128, and the number of pins to drive the LCD is 4+32=36. In the electronic scale market, it is usually necessary to drive 3 display windows, which are weight window, unit price window and amount window, in which the weight window is 5 digits, the unit price window is 5 digits, and the amount window is 6 digits. The number of segments is (5+5+6)×8=128, so HT1621 just meets it...

AI Technical Summary

Problems solved by technology

Obviously HT1621 cannot meet its application requirements, so choose HT1622, the number of COMs is increased to 8, the number of SEGs is reduced to 16 (the number of SEGs of HT1621 is 32), the total number of segments that can be driven is 8×16=144, the tubes driving the liquid crystal The number of feet is 8+16=24

Although the number of pins driving the LCD panel of the HT1622 is reduced to 24, the LCD panel driven by the HT1622 needs to be 8 COMs. Compared with the 4 COMs of the HT1621, the LCD panels of the two cannot be used in common, which greatly increases the cost of high-precision electronic scales.

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