Dissertation > Industrial Technology > Radio electronics, telecommunications technology > Radio equipment,telecommunications equipment > Terminal equipment > Display device,the display > LCD monitors

TN type liquid crystal drive and transmission measurement circuit design

Author ZhangQuan
Tutor YangKunTao
School Huazhong University of Science and Technology
Course Optical Engineering
Keywords Twisted nematic liquid crystal displays Transmittance curves Data collection LCD driver
CLC TN873.93
Type Master's thesis
Year 2011
Downloads 29
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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.

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