液晶显示器英文文献及翻译

本科生毕业设计英文文献及翻译

题目家用多功能仪器的设计

姓名李元

学号************

专业电子信息工程

指导教师李亚梅

英文文献及翻译

班级：4051090101 姓名：李元学号：405109010302

12864 LCD Monitor

At present, the market mainstream LCD(liquid crystal display) are divided into the following categories: TN (twisted array type), STN (super twisted array type), DSTN (Double Super Twisted array), HPA (high-performance rapid addressing or DSTN), TFT (thin-film field-effect transistor) and so on.The majority of small household electrical appliances are used in TN-type monochrome liquid crystal displays,Its principle is to have a liquid crystal filled with two out of the plane between the small trough. The two slots on the plane perpendicular to each other (intersection into a 90 °).As the light along the direction of the spread of the arrangement of elements, so when the light through the LCD reversed 90 °. When the liquid crystal when a voltage increase, the vertical elements will be re-arranged so that light can be directed out, without any reverse. This LCD is by two vertical polarization filter constitutes, therefore, under normal circumstances should be to block all attempts to penetrate the light.If the DC-driven LCD, display units will cause permanent damage. In order to prevent irreversible damage to the electrochemical reaction LCD, plus all the characters in the paragraph on the voltage polarity must be reversed periodically so that the paragraph be added to the character of the average voltage is 0. In order to save single-chip I / O port line, using the method of multiplexing drive LCD.

ST7920 LCD controller/driver IC can display alphabets, numbers, Chinese fonts and self-defined characters. It supports 3 kinds of bus interface, namely 8 bit/ 4bit and serial. All functions, including display RAM, character generator ROM, LCD display drivers and control circuits are all in a one-chip solution. With a minimum system configuration, a Chinese character display system can easily achieved.

ST7920 includes character ROM with 8192 16X16 dots Chinese fonts and 126 16X8 dots half height alphanumerical fonts. Also for graphic display it supports

64x256 dots graphic display area（GDRAM）and 240 dots ICON RAM. ST7920 has built in 4 sets CGRAM providing

software programmable 16X16 font. ST7920 has wide operating voltage (2.7V to 5.5V) and low power consumption suitable for battery power portable device.

It is easy to support multi languages application such as Chinese and English. Two consecutive bytes are used to specify one 16x16 character or two 8x16