What are the characteristics of LCD screen?

The function of the lamp in the LCD projector is to modulate the projection light source, so it is called the LCD light valve. The early liquid crystal light valve combined the liquid crystal box with the photosensitive layer with a light shielding layer in the middle. The photosensitive substance is amorphous silicon, Se, CdS and other photoconductive films. When the photoconductive layer receives different amounts of light, the resistance changes, thereby modulating the voltage applied to the liquid crystal. Later, electrically writable CCD was used, but at present, liquid crystal cell and active matrix are mostly used. Especially the LCOS (liquid crystal on silicon), which has developed rapidly in recent years, is a typical projection type.

In LCOS, the active matrix is made directly on the monocrystalline silicon wafer, and the size can be made very small, which can make full use of the mature silicon integration process. Editing the characteristics of liquid crystal display Liquid crystal display devices will electrolyze under the action of DC voltage, so they must be driven by AC, and the DC component of AC component should be limited to no more than tens of millivolts; Because the change of optical properties of liquid crystal under the action of electric field depends on the elastic deformation of liquid crystal as an elastic continuum and the response time is long, the effect of alternating driving voltage does not depend on its peak value. The popularity of embedded portable devices with lower frequency than high performance puts forward new requirements for the design of embedded display system: high performance, low power consumption, small size, good portability and being able to work in various lighting environments. The embedded display system designed in this paper provides a solution for the display system development of such portable devices, which not only meets the high performance required by high-end embedded devices, but also maintains low power consumption under high-brightness display conditions, and is suitable for high-end PDA, portable media player, handheld navigator, portable medical and test equipment and other fields. Under the condition of 1000Hz, the change of liquid crystal transmittance is only related to the effective value of applied voltage; Liquid crystal box is a capacitive load, and the resistance of liquid crystal can be ignored in most cases, which is non-polar, that is, positive pressure and negative pressure have the same effect.