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Development of a New Automatic Image Quality Optimization System for Mobile TFT-LCD Applications  

Ryu, Jee-Youl (Division of Electronic, Computer and Telecommunication Engineering Pukyong National University)
Noh, Seok-Ho (Electronic Engineering, College of Electronic & Information Engineering, Andong National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SC / v.47, no.1, 2010 , pp. 17-28 More about this Journal
Abstract
This paper presents a new automatic TFT-LCD image quality optimization system using DSP for the first time. Since conventional manual method depends on experiences of LCD module developers, it is highly labor-intensive and requires several correction steps providing large gamma correction error. The proposed system optimizes automatically gamma adjustment and power setting registers in mobile TFT-LCD driver IC to reduce gamma correction error, adjusting time, and flicker. It contains module-under-test (MUT, TFT-LCD module), PC installed with program, multimedia display tester for measuring luminance and flicker, and control board for interface between PC and TFT-LCD module. We have developed a new algorithm using 6-point programmable matching technique with reference gamma curve and applying automatic power setting sequence. Developed algorithm and program are generally applicable for most of the TFT-LCD modules. It is realized to calibrate gamma values of 1.8, 2.0, 2.2 and 3.0, and reduce flicker level. The control board is designed with DSP and FPGA, and it supports various interfaces such as RGB and CPU. Developed automatic image quality optimization system showed significantly reduced gamma adjusting time, reduced flicker, and much less average gamma error than conventional manual method. We believe that the proposed system is very useful to provide high-quality TFT-LCD and to improve developing process using optimized gamma-curve setting and automatic power setting.
Keywords
Automatic image quality optimization system; gamma curve optimization; 6-point programmable matching technique; flicker; automatic power setting;
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