What Are The Types Of Backlighting For Light Guide Panels?

There are three main types of backlight according to the type of light source: EL, CCFL and LED, and depending on the position of the light source, they are divided into side light type and direct down type (bottom backlight type). Side light type. This is a type of backlighting where a linear or point light source is placed on the side of a specially designed light guide. Depending on the actual use, it can be made into a double-sided type or even a triple-sided type.

The backlight of the light guide can be any colour, monochrome liquid crystal usually has yellow, green, blue, white and other backlight. Whereas colour displays use white white light, as they cover a wider range of colours.

LED backlighting is used in small, inexpensive LCD panels. Its light is usually coloured, although white backlighting is becoming more common. Electro-optical panels are often used in large displays where a uniform backlight is important. The electro-optical panel needs to be driven by a high voltage alternating current, which is supplied by the inverter circuit. Cold cathode tubes are used, for example, in computer monitors, usually white in colour, which also require a reversing converter and diffuser. Incandescent backlights are used when high brightness is required, but have the disadvantage that incandescent bulbs have a rather limited lifetime and generate considerable heat.

　　LED backlighting enhances the colour performance of LCD displays, and the LED light is produced by three separate LEDs, providing a colour spectrum that matches that of the LCD dot filter itself.