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Basic components of the TFT LCD screen

Views: 239     Author: Wendy     Publish Time: 2023-08-31      Origin: Site


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Basic components of the TFT LCD screen

Thin film field effect transistors, or TFT LCDs, are used. In order to display screen information with fast speed, high brightness, and high contrast, each liquid crystal pixel on the liquid crystal display is powered by a thin film transistor that is integrated behind it. This is what is meant by the term "thin film transistor." The liquid crystal display's composition is straightforward. A complete liquid crystal display is made up of the liquid crystal panel, the corresponding driving board (also known as the main board; its compositional structure is not intended to be the row and column driving circuit in the liquid crystal panel), the power supply board, the high voltage board, the button control board, etc.

1. The TFT LCD screen's power supply component

Part of the power supply: The switching power supply and the DC/DC converter make up the liquid crystal display's power supply circuit. Among them, the switching power supply is an AC/DC converter, its function is to convert the AC 220V or 110V (European standard) into a 12V DC power supply (some models are 14V, 18V, 24V, or 28V), supply DC/DC Converter and high-voltage board circuit; DC/DC DC converter is used to convert the DC voltage (such as 12V) generated by the switching power supply into 5V, 3.3V, 2.5V and other voltages, which are supplied to the driver board and the liquid crystal panel.

2. The TFT LCD screen's driver board

The main board, which is the primary circuit of the liquid crystal display, is also known as the driver board of the TFT LCD screen. The input interface circuit, A/D converter circuit, clock generator, Sealer circuit, microcontroller circuit, and output interface circuit make up the majority of its components.

3. The TFT LCD screen's keypad portion

Key board component: The key control board is where the key circuit and, in most cases, the indication lights are situated. The key circuit's purpose is to turn the circuit on and off. The key electronic switch is turned on when the switch is pressed, and it is turned off when the hand is released. The MCU on the driver board receives the switch signal output by the key switch. The control signal is output to control the pertinent circuit to finish the appropriate operation and action after being acknowledged by the MCU.

4. A TFT LCD screen component called the high-voltage board

High-voltage board component: The high-voltage board, which is frequently referred to as an inverter circuit or an inverter, is also sometimes referred to as a high-voltage strip since it is typically long and in the shape of a strip. Its job is to transform the power supply's low-voltage DC output into the high-frequency, high-voltage AC needed by the liquid crystal panel, which powers the LCD panel's backlight. This voltage must be above 600 volts. There are primarily two installation types for the high-voltage board of the TFT LCD screen: The switching power supply circuit is put alongside it on a separate circuit board and uses an internal switching power supply.

LVDS receiver (optional; LVDS LCD screen has this circuit), driver IC circuit (containing source driver IC and gate driver IC), timing sequence Control IC (TC0N), and backlight are the major components of the LCD panel.




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