What are LCD Projectors?

The rise of liquid crystal projectors is mainly an internal key component LCD. Due to the large number of notebook PCs and portable DVD players, LCDs have been valued.

LCD projector

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The rise of liquid crystal projectors is mainly an internal key component LCD. Due to the large number of notebook PCs and portable DVD players, LCDs have been valued.

LCD projectors are high-tech products brought by the development of liquid crystal technology, lighting technology and integrated circuits. Its key technology is the manufacture of liquid crystal panels. LCD projectors use the photoelectric effect of liquid crystals, that is, the arrangement of liquid crystal molecules changes under the action of an electric field, affecting the liquid crystal cells.

From a technical point of view, the rise of LCD projectors is mainly an internal key component LCD. Due to the large number of notebook PCs and portable DVD players, LCD has been valued and the technology has gradually matured. Originally, large-screen projections were based on the use of traditional CRT-type three-gun projectors. However, since 1990, the mass production technology of LCDs has broken through, and the resolution and brightness have increased significantly. Projectors have become the mainstream of large-sized displays.

The liquid crystal projector is mainly composed of a light source, a liquid crystal panel and a driving circuit, an optical system (including an illumination system, a color separation and color combination system, and a projection imaging system). As shown in Figure 7-3. The optical system is not only complicated, but also involves a wide range of technical aspects and fields, including optical specification measurement, optical system architecture, optical design, light source modules, splitting and combining components, projection lenses, and screens. As for the LCD liquid crystal module, it is a device for controlling the image displayed by the projector. The main considerations are RGB pixel arrangement and liquid crystal characteristics. It includes common silicon crystal TFT (thin film transistor) process technology, which has a direct impact on image resolution. . The final electronic part is to process the input electronic image signal, and then transmit the color electronic signal to be displayed to the LCD liquid crystal module.

The basic principle of liquid crystal projection is to use the LCD liquid crystal module to adjust the color light emitted from the light source to the screen. In order to accurately project the color of the image, the color of the light source needs to be separated into three colors: R, G, and B. Combine them and project them on the screen with a projection lens. LCD projectors are divided into two types: the video type that cannot be connected to the computer and the data type that can be connected to the computer because of the difference in receiving electronic signals. According to the difference between the front and rear positions of the viewer and the screen, it can be divided into the front projection type There are two types of rear projection (Rear Projector), and the number of LCD panels used can be divided into two types: single-chip and three-chip.