The liquid crystal display screen is an internal screen.
The liquid crystal display screen (LCD) is part of the mobile phone screen and is located inside the external screen and the touch screen. The mobile phone screen is usually composed of a three-layer structure, from the outside to the inside, the cover glass (external screen), the touch screen and the liquid crystal display screen (internal screen). The external screen mainly protects the internal structure of the mobile phone, while the touch screen is responsible for receiving and transmitting the user's touch signal. The internal screen, that is, the liquid crystal display screen, has the main function of displaying images and texts, providing users with a clear and bright visual experience. The liquid crystal display screen contains a large number of pixels, each of which can change the brightness independently to display different colors and images. When there is a problem with the internal screen, it is usually necessary to replace the entire screen assembly, because the internal screen is the core part of the entire screen and is responsible for the display of images and texts.
The working principle of the liquid crystal display screen is to use the change in the arrangement direction of the liquid crystal molecules to change the transmittance of the external light source to complete the electro-optical conversion, and then use the different excitations of the red, green and blue primary color signals to complete the color reproduction in the time domain and space domain through the red, green and blue primary color filter films. The driving circuit of the LCD screen is responsible for controlling the orientation of the liquid crystal molecules, thereby controlling the polarization direction of the light and realizing the display of the image.