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1、,產品 : TFT-LCD Panel,TFT-Array,Cell,Module,液晶,Display Technology : CRT vs AMLCD,CRT Advantage: Low cost per pixel and high quality of display Applications: TV, computer, oscilloscope and measuring devices Market: 1993 : 11 billions 1998 : 18 billions Disadvantage: Environmental and safety issues,AMLC
2、D Advantage: thin, light-weighted, and low power consumption Applications: portable & compact systems and HDTV Market: 1993 2 billions 1998 10-15 billions Disadvantage: cost, large upfront investment and manufacturing difficulties,TFT-based Active Matrix LCDs (AMLCD),In an AMLCD display, each pixel
3、has a TFT. The gate is attached to a horizontal row electrode and the drain is attached to a vertical column electrode. The source is attached to the LC electrode. The display is activated one row at a time, by activating the gate lines. The column electrodes carry the data voltages. When a TFT is t
4、urned on, the data line charges up the LC capacitor to the appropriate voltage. Then the TFT is turned off, so that the charge is held on the capacitor until the next refresh time. (Typical refresh rates are 60-70 Hz) The data voltage is isolated from the other rows of the display by the TFT, so tha
5、t cross talk is very low, even when the number of rows is large. The overall effect is almost the same as being able to control the voltage at each pixels. Thus, any point on the transmission curve is accessible, leading to good ON/OFF contrast and good gray scale control.,TFT-based Active Matrix LC
6、Ds (AMLCD),Liquid Crystal Operation,LC sandwiched between glass plates, which are rubbed at right angles to align the LC molecules. Polarizers aligned perpendicularly on either side. With no voltage applied across the pixel, the LC molecules twist to align to the rubbing of the glass plates. Light e
7、ntering the first polarizer is twisted and can exit the second polarizer pixel is ON With a voltage applied across the pixel, the LC molecules untwist to align with the electric field. Light entering the first polarizer cannot exit the second polarizer pixel is OFF.,Liquid Crystal Pixel: ON,Polarize
8、r 1 (Vertical),Polarizar 2 (Horizontal),Horizontally Polarized Light Out,Unpolarized Light In,Liquid Crystal,No applied voltage: optical polarization follows twist of LC molecules,Liquid Crystal Pixel: OFF,Polarizer 1 (Vertical),Polarizar 2 (Horizontal),No Light Out,Unpolarized Light In,Liquid Cryst
9、al,applied voltage: LC molecules to isotropic.,Qualitative Comparison,Crystalline,Polysilicon,Amorphous,Relative sizes,TFT - LCD Pixel Top View,Gate metal Data metal ITO,CS storage capacitance,IPS TFTLCD Pixel Top View,Gate metal Data metal,CS storage capacitance,cell layout,人生是彩色也,Join TFTLCD, Display Your Life,
