TN type liquid crystal drive and transmission measurement circuit design
|School||Huazhong University of Science and Technology|
|Keywords||Twisted nematic liquid crystal displays Transmittance curves Data collection LCD driver|
LCD display principle of the conventional type of display , there are differences in the structure , so the display device previously used conventional testing instrument can not be used for measurement of the liquid crystal display device . This study is a system designed to detect TN-type liquid crystal display device . The transmittance curves are LCD liquid crystal material and a liquid crystal display device of the important parameters of the LCD module design has important guiding significance is an important design parameter LCD driver circuit . The measuring principle is based on the display of different gray levels different attenuation of the beam is measured . The topics developed TN type liquid crystal display driver circuitry and transmittance measurements , first according to the design requirements and indicators of the system design and to determine the feasibility of programmatic principle . Design task consists of two parts: the measurement system hardware design and system application development . Is chosen as the main control chip microcontroller built hardware platform . Including LCD driver and a data receiving two parts , LCD driver part of the function is based on the serial output of the command received a certain frequency , peak to peak , and the bias value driven ones driving waveform driving LCD , LCD driver uses a dynamic bias drive France . Data receiving some of the major photoelectric conversion , I / V conversion, information processing, data acquisition, and single-chip communication . According to the requirements and functions of each module , complete the device selection . In the hardware system design based on the use of assembly language to complete the preparation of a software program , including LCD driver preparation, data collection procedures for the preparation and control procedures for the preparation part . The software written in the hardware system debugging , the completion of the data acquisition and transmission curve drawing . Finally, the paper also summarizes the entire project design , and project problems and improvement measures proposed to further improve the system 's recommendations.