Writer: lilyRelease Time: 2023-08-16 03:54Browse: 299
A liquid crystal display is a device that uses the electro-optic effect of liquid crystal molecules on light to display images. It consists of a liquid crystal layer, a glass substrate, a backlight source, and a circuit driver board. The liquid crystal layer is sandwiched by two parallel glass substrates, and the middle is filled with liquid crystal molecules. When a voltage is applied to the liquid crystal molecules, the liquid crystal molecules will be twisted, thereby changing the direction of light propagation and realizing image display. The backlight provides background light to make the image clearly visible.
LCD screen voltage requirements
The LCD screen needs a variety of voltages to display images during its working process. The main voltage requirements include: backlight voltage, driving voltage and control voltage. Backlight voltage is used to provide background light, usually a DC voltage. The driving voltage is used to control the twisting of the liquid crystal molecules, usually an AC voltage. The control voltage is used to control various functions of the LCD screen, such as brightness, contrast, etc.
Backlight voltage is one of the most important voltages in LCD screens. The backlight usually adopts a cold cathode fluorescent lamp or an LED lamp as a light source. Cold-cathode fluorescent lamps require a high-voltage power supply to excite phosphors to emit light, while LED lamps require a lower voltage to drive. Different types of LCD backlights have different voltage requirements.
The driving voltage is the voltage used to control the twisting of liquid crystal molecules in the LCD screen. The degree of twisting of the liquid crystal molecules is proportional to the magnitude of the driving voltage. The LCD screen needs to supply positive and negative symmetrical AC voltage to realize the twisting 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 range of LCD control voltage is small, usually between a few volts and tens 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 high requirements for voltage stability. Voltage fluctuations will directly affect the twisting of liquid crystal molecules and the display effect of images. LCD screens are usually equipped with a voltage regulator circuit to ensure a stable output of voltage.
The voltage of the LCD screen is usually supplied by an external power source. LCD screens have low voltage requirements 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 requirements, LCD screens usually need to adjust and control the voltage. This can be achieved by the control chip on the circuit driver board. The control chip can adjust parameters such as the brightness and contrast of the backlight source and the degree of twisting of the liquid crystal molecules according to the settings of the user.
The LCD screen needs backlight voltage, driving voltage and control voltage to realize the display of images. The stability and accuracy of these voltages are critical 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 the 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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