Lcd official

Lcd official

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  Department of Electronicand Telecommunication Engineering Structure and operating principle of the LCD Advisor : Dr. Pham Nguyen Thanh Loan Members: Phạm Huy Hùng Lê Huy Hoàng Ha Noi, 27/10/2015
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  Contents 2 IntroductionI ClassificationII Structure of LCDIII OperatingprincipleIV SummaryV
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  I - Introduction •Be formed by the liquid crystals • Production for the first time since 1970s • Using for computers, TVs, gaming devices… • Used to show images, moving pictures… 3 LCD monitor Via: Internet
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  Why LCD ? 4 Cathode-RayTube (CRT) LCD monitor Using electron beam to excite the phosphorous 3 types of phosphorus: emit light 3 color R G B All of pixel create image Using liquid crystal and voltage to control light Using color filter to create all of colors
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  Why LCD ? •Smaller size • Lower power consumption • Lighter weight • No electromagnetic fields • Longer life 5 Cathode-Ray Tube (CRT) LCD monitor So, Why do people use LCD
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  Lyquid crystals • Existsbetween 2 state:liquid and solid crystal • Can change the polarization of light • Molecules linked to groups • Using Nematic phase in LCD 6 Liquid crystal phases Via: Internet
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  Pixel 7 Structure of pixel •Holding crystal by Glass plates • Using 2 polarizing filters • 3 sub-pixels use 1 electrode plate • Inclued 3 sub-pixels: R, G, B Via: Internet
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  II - Classification 8 Passivematrix LCD ( DSTN LCD ) Active matrix LCD ( TFT LCD ) Via: Internet
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  Passive matrix LCD 9 •Using a simple grid to control pixels • Slow response time • Imprecise voltage control • Used in low-resolution displays Passive matrix Via: Internet
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  Active matrix LCD 10 Activematrix • Depends on thin film transistors (TFT) • Fast response time • Good image quality • 1 dot is controlled by 1 trans Via: Internet
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  Advantage of ActiveMatrix Display • Higher size • Higher contrast • Higher time response. Eliminate ghosting • Higher Resolution • Better control of color 9 Via: Internet
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  Structure of LCD 12 Consistof 2 parts: Part 1: - Backlight:provide light to LC panel Part 2: - LC panel: Display Backlight and LC panel Via: Internet
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  IV - Operatingprinciple 13 LCD panel • Voltage off: The light can pass through • Voltage on: Depend on Vliquid-crystal Via: Internet
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  14 IV- Operating principle Activeaddressing of 3×3 matrix Equivalent circuit of a subpixel
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  V - Summary 16 LCD Liquid crystal Structure LCpanel Backlight
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  17 Thanks for Listening
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  18 Any Questions?