The principle of monochrome black and white LCD display screen

The working principle of monochrome black and white LCD display is mainly based on the electro-optic effect of TN type LCD. The TN type liquid crystal is sandwiched between two pieces of glass, which are coated with a transparent conductive film ITO as electrodes on their surfaces, and an orientation layer PI is applied on the glass to align the liquid crystal molecules in a specific direction. Liquid crystal molecules have a 90 ° twist in their natural state. When an electric field is applied, the liquid crystal molecules rotate, changing their birefringence and thus affecting the polarization direction of polarized light. By selecting an appropriate thickness, the polarization direction of polarized light is changed by 90 degrees, and two parallel polarizing plates are used to completely prevent light from passing through. When a sufficiently large voltage is applied, the liquid crystal molecules are parallel to the direction of the electric field, and the polarization direction of light remains unchanged, allowing light to pass through the second polarizer and achieve brightness control of light

The structure of a monochrome black and white liquid crystal display screen includes components such as backlight panel, thin-film transistor, light guide plate, polarizing plate, liquid crystal material, filter plate, filter glass, and alignment film. The liquid crystal material itself does not emit light and requires a backlight module to provide a light source. The light emitted by the backlight module becomes uniform after passing through the light guide plate and polarizing plate, and then the polarization direction of the light rotates when passing through the liquid crystal layer, ultimately passing through or blocking the polarizing film, forming a black and white display effect

The application scenarios of monochrome black and white LCD screens include computers, electronic watches, e-books, and other devices. Due to its low manufacturing cost and low power consumption, it is suitable for applications that do not require high color requirements. In addition, the display screen of monochrome black and white LCD screen will not flicker, which is less harmful to the eyes and suitable for long-term viewing