LCD

Liquid crystal display is the abbreviation of Liquid Crystal Display. The structure of the LCD is to place liquid crystals in two parallel glasses. There are many vertical and horizontal small wires in the middle of the two glasses. The control of rod crystal molecules is changed by energization or not. Direction, the light is refracted to produce a picture. Better than CRT, but the price is more expensive.

The LCD liquid crystal projector is a combination of liquid crystal display technology and projection technology. It utilizes the electro-optic effect of liquid crystals to control the transmittance and reflectance of liquid crystal cells through circuits, thereby generating different gray levels and up to 16.7 million colors. Beautiful image. The main imaging device of the LCD projector is a liquid crystal panel. The size of the LCD projector depends on the size of the LCD panel. The smaller the LCD panel, the smaller the projector's size.

According to the electro-optic effect, liquid crystal materials can be classified into two types of active liquid crystals and inactive liquid crystals, in which the active liquid crystal has high light transmittance and controllability. The liquid crystal panel uses active liquid crystal, and people can control the brightness and color of the liquid crystal panel through the relevant control system. Like liquid crystal displays, LCD projectors use twisted nematic liquid crystals. The light source of the LCD projector is a dedicated high-power light bulb, and the light emitting energy is much higher than that of a CRT projector using fluorescent light, so the brightness and color saturation of the LCD projector are higher than those of a CRT projector. The pixels of the LCD projector are the liquid crystal cells on the liquid crystal panel. Once the liquid crystal panel is selected, the resolution is basically determined. Therefore, the function of the LCD projector to adjust the resolution is worse than that of the CRT projector.

According to the number of internal LCD panels, LCD projectors can be divided into single-chip and three-chip LCDs. Most modern LCD projectors use 3-chip LCD panels (Figure 1). The three-chip LCD projector uses red, green, and blue three liquid crystal panels as control layers for red, green, and blue light, respectively. The white light emitted by the light source is condensed into the dichroic mirror group after passing through the lens group. The red light is firstly separated and projected onto the red liquid crystal panel. The image information represented by the transparency under the “record” of the liquid crystal panel is projected into an image. Red light information. The green light is projected on the green liquid crystal panel to form the green light information in the image. The same blue light passes through the blue liquid crystal panel to generate the blue light information in the image. The three colors of light converge in the prism and are projected by the projection lens. A full-color image is formed on the projection screen. Three-chip LCD projectors have higher image quality and higher brightness than monolithic LCD projectors. LCD projectors are smaller, lighter in weight, simpler in manufacturing process, higher in brightness and contrast, and moderate in resolution. Nowadays LCD projectors occupy a market share of about 70% of the total market share, which is the current market share. The highest and most widely used projector.