What are the working characteristics and driving methods of TFT color LCD display screens?

Color TFT-LCD uses thin film transistors to generate voltage to control the liquid crystal steering display. It consists of a glass plate with a thin film field effect transistor matrix circuit and a glass plate with a color filter. Liquid crystal is poured between the two glass plates. Each pixel in the display is divided by the horizontal and vertical common metal wires of the thin film transistor matrix circuit. Each pixel contains a thin film field effect transistor and a capacitor. This capacitor is composed of an indium tin oxide (ITO) transparent electrode in the matrix circuit and a common ITO electrode on the color filter. The liquid crystal sandwiched between the two electrodes acts as a dielectric in the capacitor.

The display uses a driving method that scans one line at a time. When a positive pulse is applied to a certain horizontal scanning common wire (or gate line), all thin film transistors connected to the horizontal wire are turned on and are in a conductive state. At this time, the capacitor on each pixel is charged to the voltage of its corresponding vertical common wire (or signal line). When it is the turn of other scan lines to add positive pulses, the original scan line is added with negative voltage, and all thin film transistors connected to the scan line are turned off and non-conductive.

Therefore, the charge originally charged to each capacitor can maintain the time required to scan a frame until the next time it is the turn of the line to scan. If the display uses twisted nematic phase (TN) liquid crystal, it is best to drive it with AC voltage, that is, the polarity of the driving voltage of each picture must be opposite to that of the previous picture. The liquid crystal in the display is like a light valve. As the voltage on each pixel changes, the intensity of the color light passing through the pixel also changes.

TFT liquid crystal display is an active matrix display. Therefore, its driving method is completely different from TN and STN liquid crystal displays. It adopts the active matrix dynamic driving method. The reason why TFT liquid crystal display can display realistic colors is that its internal color filter and TFT field effect tube work together to complete the coordination.

Shenzhen Jingda Display Technology Co., Ltd. is a TFT liquid crystal display manufacturer, OLED display manufacturer, LCD display manufacturer. It is a high-tech enterprise specializing in the research and development, production and sales of liquid crystal display (LCD) and liquid crystal display module (LCM). After ten years of development, the company has gradually established a research and development center, LCD division, FOG division, and module assembly division. Its products include TN-LCD, STN-LCD, COG-LCM, COB-LCM, TFT, flexible display, PM-OLED, AM-OLED, Electronic paper, etc. With long-term planning for production, R&D, sales, and talents, a solid business structure has been built, and sales have maintained a steady growth.