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Design and Research of the Driving Circuits for Low-Power LCD

Author: Wang
Tutor: XinXiaoNing
School: Shenyang University of Technology
Course: Microelectronics and Solid State Electronics
Keywords: Liquid Crystal Display Thin Film Transistor Source driver Low-power
CLC: TN873
Type: Master's thesis
Year: 2009
Downloads: 235
Quote: 0
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Abstract


With the rapid development of TFT LCD panel display technique,more and more requirements of peripheral circuit are presented.As one of key components in TFT LCD display module,TFT LCD driver chip have direct impact on the quality of LCD display and the power of display module.Source Driver circuit module is one of key components in color TFT LCD driver control chip.Its function is transfer digital graphic display data to analog driver voltages,and drives various graphic data in TFT LCD screen.A Source Driver circuit with 160RGB×240 resolution is designed in TFT LCD driver chip with 64 grey scale display.Start with basic theory,digital Source Driver design is adopted.It mainly includes digital interface module,DAC,output buffer.Timing arrangement of graphic data processing is finished by digital interface module,which is composed of bidirectional shift registers,latches and level shifters etc.It also realizes serial parallel conversion of graphic signals.Compares with voltage divided and current divided; DAC switch matrix is adopted to realize the selection of display pole voltages with super-low static power.Though model building and analyzing,Rail-to-Rail operational amplifier works as output buffer to realize high-linearity,full-swing voltage transmission with 1 transfer factor and enhance the capability of output voltages’ driver loads with no distortion in voltage transmission.The amplifier is optimized.Balance circuit adds to reject non-linearity.Bias module provides appropriate voltage bias and logic control signals and reduces static power of amplifier to realized low-power of the whole circuit.The circuit is individually simulated and verified by HSPICE under HEJIAN 0.25μm HV CMOS process in TT,FF and SS process comer.The results of simulation indicate that the static power of one-channel Source Driver is almost 20μW;the maximum deviation voltage is less than 35mV.The Source Driver circuit designed meets the requirements of LCD Source Driver well.Finally,the layout of Source Driver circuit finished with Cadence,and passed DRC and LVS.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radio equipment,telecommunications equipment > Terminal equipment > Display device,the display
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