History of TFT LCD

LCD is by the Austrian botanist Fredreich Rheinizer discovered in 1888. In the mid-1960s, scientists have confirmed that the liquid crystal in the external charge after excitation by the crystal light will be deflected. Early prototypes extremely unstable, not mass production, but all of this is a British researcher has changed, he brought a stable liquid crystal material - biphenyl.
TFT LCD is a three-layer structure, the liquid crystal layer is filled in between two glass layers. TFT glass is a glass layer, which has the same number of pixels displayed TFT. The second layer is a color filter glass layer having a color filter is used to generate color. The liquid crystal layer based on the color filter glass layer between the TFT glass layer is moved to the different voltage. Amount of light generated by the backlight of the liquid crystal layer determines the amount of movement to produce colors. A proper lcd module flat screen monitor works, you need the following three voltage:
1. AVDD is a TFT for driving a high voltage / current output.
2. VON is a high bias voltage of the TFT output, which is turn-on voltage.
3. VOFF is the reverse of the TFT reverse bias voltage output, the voltage is turned off.
New four-output regulator designed for TFT LCD Display flat panel display
LT1943 quad output adjustable switching regulator provides power to large-size TFT LCD flat panel display. This device uses a 28-pin small outline thermally enhanced TSSOP package, you can generate 3.3V or 5V logic voltage, but also has three TFT LCD desired output power. Input voltage range of 4.5V to 22V, buck regulator provides a low voltage output VLOGIC and up to 2A. High power boost converter and a reverse converter offers LCD flat display with the required three independent output voltage AVDD, VON and VOFF. VON signal to provide the high-side PNP conduction delay, which can handle up to 30mA of current.
Protection circuit ensures that in any one of four output voltage drops below the normal 10%, VON not work. All switches and internal 1.2MHz clock synchronization, allowing the use of small inductors and exterior ceramic capacitors. Current mode architecture provides excellent transient response. Moreover, in order to achieve optimum flexibility, all outputs are adjustable. LT1943 Another very important feature is its input voltage range of 4.5V to 22V, which allows the AC adapter may be greater than 5V, to drive a larger flat panel display. This is very important because 5V AC adapter has a thicker cable, to handle the appropriate power level, but these cables have inherent high voltage drop, which causes the output to drop below the specified modulation level, thus the display failure. Higher voltage AC adapter (for example, 19V) cables are much thinner and smaller pressure drop, can display provides better regulation performance.