Writer: adminRelease Time: 2024-02-21 03:56Browse: 553
An LCD screen is a device that uses the electro-optical effect of liquid crystal molecules on light to display images. It consists of a liquid crystal layer, a glass substrate, a backlight and a circuit driver board. The liquid crystal layer is sandwiched between two parallel glass substrates, with liquid crystal molecules filled in the middle. When voltage is applied to liquid crystal molecules, the liquid crystal molecules twist, thereby changing the propagation direction of light and achieving image display. The backlight provides background light so that the image can be clearly seen.
LCD screen voltage requirements
The LCD screen requires a variety of voltages to display images during operation. The main voltage requirements include: backlight voltage, driving voltage and control voltage. The backlight voltage is used to provide background light, usually a DC voltage. The driving voltage is used to control the rotation of liquid crystal molecules, usually AC voltage. The control voltage is used to control various functions of the LCD screen, such as brightness, contrast, etc.
The backlight voltage is one of the most important voltages in an LCD screen. Backlights usually use cold cathode fluorescent lamps or LED lamps as light sources. Cold cathode fluorescent lamps require a high-voltage power supply to excite the phosphor to emit light, while LED lamps require lower voltages to drive. Different types of LCD backlights have different voltage requirements.
The driving voltage is the voltage used in the LCD screen to control the rotation of liquid crystal molecules. The degree of twisting of liquid crystal molecules is proportional to the driving voltage. The LCD screen needs to supply positive and negative symmetrical AC voltage to achieve the twist of the liquid crystal molecules. The frequency of the driving voltage will also affect the display effect of the LCD screen, and the frequency of 50Hz or 60Hz is usually used.
The control voltage is used to control various functions of the LCD screen, such as brightness, contrast, color, etc. The LCD screen control voltage range is small, usually between a few volts and dozens of volts. The size of the control voltage will directly affect the display effect of the image, so precise control is required.
LCD screens have higher voltage stability requirements. Voltage fluctuations will directly affect the twisting of liquid crystal molecules and the display effect of images. LCD screens are usually equipped with voltage stabilizing circuits to ensure stable voltage output.
The voltage of the LCD screen is usually supplied by an external power supply. The voltage requirement of the LCD screen is low and can be supplied by a DC power supply or an AC adapter. In some mobile devices, the voltage of the LCD screen can be supplied by the battery.
In order to meet different display needs, LCD screens usually need to adjust and control the voltage. This can be achieved through the control chip on the circuit driver board. The control chip can adjust parameters such as the brightness and contrast of the backlight, as well as the degree of twisting of the liquid crystal molecules according to the user's settings.
The LCD screen requires backlight voltage, driving voltage and control voltage to display images. The stability and accuracy of these voltages are crucial to the display effect of the LCD screen. The voltage supply and adjustment of the LCD screen also need to be realized through the circuit driver board and control chip. Understanding the voltage requirements and control methods of LCD screens is of great significance to the design and use of LCD screens.
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