LCD (Liquid Crystal Display) liquid crystal projectors can be divided into liquid crystal panel projectors and liquid crystal light valve projectors. The former is the main product in the projector market. Liquid crystal is a substance between liquid and solid. It does not emit light by itself, and its working properties are greatly affected by temperature. Its working temperature is -55℃～+77℃. The projector uses the photoelectric effect of liquid crystal, that is, the arrangement of liquid crystal molecules changes under the action of an electric field, which affects the transmittance or reflectivity of the liquid crystal unit projector, thereby affecting its optical properties, and producing different gray levels and colors. image. Because LCD projectors have better color reproduction and resolution up to SXGA standards, they are small in size, light in weight, and very convenient to carry. They are the mainstream products in the projector market. According to the number of LCD panels, LCD projectors are divided into three-chip computers and single-chip microcomputers, while there are very few single-board projector models, and three-chip projectors are more common.
There are 3 liquid crystal panels in the projector, and liquid crystals are distributed among them. Liquid crystal is a substance between liquid and solid. It does not emit light by itself. They are arranged neatly like pixels on a phosphor screen. The projector uses the photoelectric effect of the liquid crystal, that is, the arrangement of the liquid crystal molecules and the state of the liquid crystal molecules themselves change under the action of an electric field, which affects the light transmittance or reflectivity of its liquid crystal cells. The projector uses this principle to achieve the purpose of accurately controlling the light passing through the liquid crystal cell by using electrical signals. The light source in the liquid crystal projector is a metal halide lamp or UHP (cold light source), which emits bright white light. After passing through a beam splitter in the optical path system, the white light is decomposed into RGB (red, green, blue) three element colors. The light of the three element colors of RGB passes through the liquid crystal at a precise position. At this time, each liquid crystal acts like a light valve, controlling the passage of light in each liquid crystal and how much light passes through. The light of the three element colors is just like this. After the lens of the projector is accurately projected on the screen, which point should be what color and how much light intensity is, they are all distributed exactly right. In this way, a colorful image consistent with the source image is projected on the screen. Ordinary LCD projectors have many advantages such as good color, price advantage and good brightness uniformity, so they are gradually popularizing in homes and small commercial places at a price of 10,000 yuan or even less than 10,000 yuan.
In addition, the liquid crystal light valve projector represents the high-end product of the liquid crystal projector. It uses a CRT tube and a liquid crystal light valve as the imaging device. It is a product of the combination of a CRT projector, a liquid crystal and a light valve. With very high brightness and resolution, it is suitable for occasions with strong ambient light and large projection screens, such as super large-scale command centers, conference centers or entertainment venues.