TFT (Thin Film Transistor) display is a common type of liquid crystal display screen. It works by controlling the light transmittance of liquid crystal molecules using thin film transistors, thereby realizing the display of images. The working principle of the TFT display is as follows:
1. The fabrication of the TFT display: The TFT display is usually composed of two substrates, the upper substrate is a color filter substrate, and the lower substrate is a TFT array substrate. The TFT array substrate is made by depositing thin film transistors and other components on a glass substrate.
2. Application of voltage: When a voltage is applied to the TFT array substrate, the thin film transistors are turned on or off, thereby controlling the current flowing through each pixel. The current flowing through each pixel can control the orientation of the liquid crystal molecules, thereby controlling the light transmittance.
3. Backlight module: The TFT display needs a backlight module to provide light source for the display. The backlight module usually uses LED light sources, which have the advantages of high brightness, long life and low power consumption.
4. Display of images: When the light passes through the liquid crystal molecules, the light transmittance of each pixel is controlled by the thin film transistors, thereby realizing the display of images. The images displayed by the TFT display can be static or dynamic, and can be displayed in various colors.
5. Refresh rate: The refresh rate of the TFT display refers to the number of times the screen is refreshed per second. The higher the refresh rate, the smoother the displayed images. The refresh rate of the TFT display is usually 60Hz or above.
In summary, the TFT display works by controlling the light transmittance of liquid crystal molecules using thin film transistors, thereby realizing the display of images. The TFT display has the advantages of high resolution, high brightness, wide viewing angle and fast response speed, and is widely used in various electronic devices, such as mobile phones, tablets, TVs and monitors.