The role and structure of polarizers in liquid crystal displays
Abstract: Polarizer is one of the important materials of liquid crystal display. It is a composite material made of polyvinyl alcohol (PVA) stretched film and cellulose acetate film (TAC) through multiple lamination, stretching, coating and other processes. , can realize liquid crystal display high brightness, high contrast characteristics. Polarizers account for about 10% of the cost of TFT-LCD (Thin Film Transistor Liquid Crystal Display) panels.
Polarizer is one of the important materials of liquid crystal display. It is a composite material made of polyvinyl alcohol (PVA) stretched film and cellulose acetate film (TAC) through multiple lamination, stretching, coating and other processes. Realize high brightness and high contrast characteristics of liquid crystal display. Polarizers account for about 10% of the cost of TFT-LCD (Thin Film Transistor Liquid Crystal Display) panels. Because its production technology brings together various technologies such as polymer materials, microelectronics, optoelectronics, thin films, high-purity chemistry and computer control, polarizers have high technical content.
The full name of the polarizer should be a polarizer. Those who have studied physics should know what polarized light is. The imaging of a liquid crystal display must rely on polarized light. All liquid crystals have two polarizers attached to the liquid crystal glass, forming a total thickness. A liquid crystal panel of about 1mm. If any polarizer is missing, the liquid crystal cannot display images.
Therefore, the polarizer is replaced because the polarizer facing the eyes of the ordinary LCD is frosted to dissipate the surface reflection and scatter the light to increase the viewing angle of the LCD. For the projector, any scattering will cause the loss of light. The ideal state of the liquid crystal sheet used in the projector should be a 0-degree viewing angle, that is, if the liquid crystal sheet is viewed from the vertical direction, there will be no light. Of course, this is impossible to achieve, but the closer to the 0-degree viewing angle, the higher the utilization rate of light, so after replacing the frosted polarizer with a flat polarizer, the brightness of the projector to the wall will be greatly improved. My personal estimate is that it can be increased by 50-80%, which is why the polarizer needs to be changed.
Shenzhen Hongjia Technology Co., Ltd. specializes in R&D and manufacture of 1.14-inch-10.1-inch LCD screens and touch screens. The polarizers used in the LCD screens have two types: IPS full viewing angle and ultra-wide viewing angle. The viewing angle is clear when pasted on the LCD glass. High and low temperature, anti-scratch, anti-static, visible and non-reflective under sunlight.
The earliest polarizer is mainly composed of a PVA film that can produce polarized light in the middle, and then a TAV protective film on both sides. In order to facilitate use and obtain different optical effects, the polarizer supplier should apply pressure-sensitive adhesive on both sides at the request of the liquid crystal display manufacturer, and then cover the release film. This kind of polarizer is the most common TN ordinary Total transmission polarizer. If a layer of release film is removed and a layer of reflective film is compounded, it is the most common reflective polarizer. the
The pressure-sensitive adhesive used is a high-temperature-resistant and moisture-proof pressure-sensitive adhesive, and the PVA is specially dipped in glue (dye series products), and the polarizer made is a wide-temperature type polarizer; The components through which the ultraviolet rays pass can be made into an anti-ultraviolet polarizer; a birefringent optical compensation film can be compounded on the original transmission film to make a polarizer for STN; a light turning film can be made on the original transmission film. Wide viewing angle polarizer or narrow viewing angle polarizer; coloring the pressure-sensitive adhesive, PVA film or TAC film used is a color polarizer. In fact, with the continuous development of new liquid crystal display products, there are more and more types of polarizers.