LCD display related knowledge

Blaze Display Technology Co., Ltd. | Updated: Nov 27, 2018

Liquid crystal is the most widely used display at present. Liquid crystal display is divided into active and passive. The color high-resolution display is an active display, and segment LCD and Graphic LCD are both passive displays.

The glass substrate carrying active devices (thin film transistors) between the two glasses injected with liquid crystal material is called an array substrate, also known as an Array substrate. Polarizers are pasted on the upper and lower substrates to allow light with only one vibration direction to pass through, and a color filter (abbreviation: CF) is arranged between the upper polarizer and the array substrate. In addition, a backlight source and a driving circuit are mounted on the lower side of the array substrate. The current mainstream LCD uses amorphous silicon thin film transistor TFT-LCD and passive matrix display with nematic liquid crystal. Here, the former is called active drive LCD, and the latter is passive drive LCD.

 

The upper part of the LCD display has a color filter substrate (CF substrate), and when the light passing through the array substrate passes through the CF substrate, it will be colored. In fact, a pixel of the LCD is divided into RGB 3 primary colors (red, green, blue). The combination of the three colors is called a pixel (PIXEL), and each pigment R, G, and B is called a sub-pixel. Color display uses color filters to mix RGB light to obtain various colors.

The structure of LCD Display

 

The structure of CF substrate

The structure of TFT substrate