The liquid crystal molecules of a TFT display screen do not emit light themselves, but display images by adjusting the transmission rate of light. Polarizers transform the natural light emitted by the backlight into linearly polarized light through the principle of polarized light, and work with the liquid crystal layer to adjust the amount of light transmitted to form an image.
The role of polarizer in TFT display:
Polarizers have the ability to decompose incident light into two polarized components orthogonal to each other, allowing only the component in one direction to pass, while the component in the other direction is absorbed or scattered. In a TFT display, two polarizers are affixed to the upper and lower sides of the glass substrate. The lower polarizer is used to convert the light beam generated by the backlight into polarized light, and the upper polarizer is used to resolve the polarized light after modulation by the liquid crystal electrodes to produce a contrast between light and dark, thus producing the display image.
Polarizer:
Lower Polarizer (Bottom Layer): Located below the liquid crystal layer, the lower polarizer converts the natural light emitted by the backlight into linearly polarized light.
Upper Polarizer (Top Layer): Located above the liquid crystal layer, the polarizer interacts with the modulated light from the liquid crystal to determine the direction and brightness of the light and display the final image.
Polarizers also enable anti-glare, anti-scratch, and anti-reflective/low-reflective functions to further enhance the display effect. Polarizers can optimize the contrast and brightness of the display, resulting in clearer images and fuller colors.
POL Angle:
The initial twist angle of the liquid crystal molecules determines the light transmission state of the display when it is not energized, i.e. constant black or constant white. The cooperation between the absorption axis of the polarizer and the initial twisting angle of the liquid crystal is the key to achieving this effect. Liquid crystal molecules will change their arrangement direction under the action of electric field, thus changing the polarization direction of transmitted light. The direction of the polarization axis of the polarizer must match the characteristics of the liquid crystal molecules in order to effectively regulate the transmittance of light and display the desired gray scale and color. The thickness of the liquid crystal layer, the drive voltage and the optical compensation film in different TFT panel designs all affect the optimal polarization direction, so the angle of the polarizer needs to be adjusted for the specific design. For example, a BOE panel may require a polarization angle of 0 degrees/90 degrees, while an HSD panel may require 8 degrees/73 degrees.
TN Polarizers:
Various thicknesses: 0.13-0.15mm, 0.17mm, 0.22mm, etc.
Angle selection: 45°, depending on the viewing angle of the glass.
Various materials: normal glossy, anti-scratch glossy, AG25 regular frosted, AG40 fine sand, AG13 fine sand, etc.
IPS polarizer:
Various thickness: 0.08mm, 0.11mm, 0.15mm, 0.17mm, etc.
Provide a variety of angle combinations, such as 7°/83°, 0°/90°, 183°/7°, etc., to adapt to the design of different IPS LCD panels. Materials likewise include normal glossy, scratch-resistant glossy, and multiple frosted grades.
Polarizers for increasing brightness:
DBEF Polarizer: a reflective polarizer that increases LCD display brightness by selectively reflecting light from the backlight system.DBEF Polarizer is to add high transmittance TAC film to reduce light absorption loss. Reflective polarizers (e.g. DBEF, bi-directional brightening film) are introduced to reuse the light not fully transmitted by the backlight.
AR Polarizer: By coating the surface of the polarizer with an anti-reflective film layer, the reflection of light on the surface is reduced and the transmittance is increased. This helps to reduce screen reflections and improve the viewing angle and brightness of the display while reducing eye fatigue.
AG Polarizer: By applying special treatment to the surface of the polarizer, such as spraying, coating or chemical etching, a matte surface is formed to reduce glare.AG Polarizers are widely used in touch screens, display screens, touch panels, windows, etc. to improve the display effect and user experience.
Hongcai understands the importance of polarizer to the display effect of the TFT LCD display, so it purchases polarizers from Sunnypol, a quality supplier that meets high quality standards, to ensure the picture quality and color performance of the display. In the production process of TFT panels, Tricolor adopts advanced fully automated equipment to attach the polarizers to ensure that the angle and position of the polarizers are precise and accurate. This is crucial for the correct modulation of light through the liquid crystal layer, which directly affects the quality of the display.
