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Design of Dynamic Area Control Engine of Led Backlight in LCD TV

Author: SuJianWen
Tutor: ZhengXueRen
School: South China University of Technology
Course: Microelectronics and Solid State Electronics
Keywords: LCD TV LED backlight Regional dynamic control Energy consumption Contrast
CLC: TN949.192
Type: Master's thesis
Year: 2010
Downloads: 124
Quote: 0
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Abstract


The backlight module is a major energy-consuming parts of the LCD TV . The traditional LCD TV 's backlight surface light source of constant brightness , of this backlight control mode makes the LCD TV in energy consumption is still dark image is displayed . Especially in large-size LCD TV , traditional energy consumption of the backlight problem becomes very prominent . At the same time , due to the liquid crystal light leakage traditional LCD TV contrast and have not been able to improve . New LED backlight and implementation of the regional dynamic control LCD TV can overcome these shortcomings , reduce power consumption and improve contrast . Come through the study of the principles and processes of the regional dynamic control technology : backlight driver signal decision algorithm is the key to control technology , it decided to achieve the effect of the control technology . The analysis in the research on various decision algorithm learned backlight lowered , that is, lower energy consumption and the overflow distortion rate of the display image is mutual constraints . In this paper, given a more rigorous definition of overflow distortion rate based on a decision algorithm based on the the overflow distortion rate of regional dynamic backlight driving signal . Matlab simulation and compared with several existing decision algorithm is effective , the results showed that : this algorithm has a higher flexibility the regional dynamic backlight control different types of input images and the overflow distortion rate control in a predetermined range; premise given overflow distortion rate , can determine the region with the lowest backlight driving signal to maximize the reduction of power consumption and increase contrast . Dynamic backlight control the overall architecture of the engine as well as video input , backlight control , video compensation , video output and other key functional modules , and design a new algorithm based on the completion of the Verilog-HDL language module RTL-level hardware description . Select the appropriate circuit structure design process to complete the module functionality and simplify the circuit to save hardware resource consumption . Finally, using the Matlab of each design module , the Quartus and ModelSim joint function simulation , the simulation results show that each module can correctly complete the design .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > TV > TV : Press the institutional sub- > LCD TV
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