LCD projector principle

The imaging principle of the three-chip LCD projector (see the figure below) uses the light path of a liquid crystal projector as an example: First, the light passes through the filter and filters out invisible light such as infrared rays and ultraviolet rays. The infrared ray and ultraviolet ray are certain to the LCD film. The damage effect. The light is homogenized through two multi-lens lenses and the conical light generated by the UHP lamp is corrected to a rectangular ray similar to the projected image. The prism between the two mirrors is used to pre-polarize the light, which reduces the loss of light compared to an asymmetrical light box without the prism. The light is next divided into three primary colors of red, green and blue by the spectroscope and reflected on the respective liquid crystal plates. Before reaching the liquid crystal film, the light also needs to pass through a convex lens and a polarizer. The role of the convex lens is to concentrate the light, and the polarizer further polarizes the light, so that the direction of vibration of the light is uniform and can be controlled by the liquid crystal panel. Finally, the light passes through the liquid crystal panel, is driven by the circuit board, and the pixels on the liquid crystal panel are sequentially opened and closed to generate an image, and rich colors are produced through the adjustment of the light of each primary color. The last three lights eventually converged and projected from the camera.