Design of side guide light LED backlight
I. Introduction
As human society entered the era of knowledge economy, information and knowledge to achieve real-time, with terminal equipment to achieve the exchange of information display technology is developing rapidly, as the LCD display technology is one of the developed very fast, because LCD has its own shortcomings in no light, so most applications require supporting backlight. The backlight used is incandescent bulb, cold cathode fluorescent tube, EL and LED lamps, etc.. Each backlight technology has its own characteristics in a specific application environment. One of the advantages of LED technology has been popular. The utility model has the advantages of long service life, high efficiency, low maintenance and low power consumption; small volume, allowing the LCD backlight module is connected between the thin, cost reduction of LCD display and driving circuit; low voltage driver, 5-12VDC can directly drive, and the conversion time soon, allowing the PWM brightness, can separate red, green and blue pulse control LED light and dark, can remove behind the full-color LCD display panel red green and blue filters.
LED backlight has been developing rapidly in recent years, and it has been developed from the early bottom surface to the light side. Side guide light LED backlight source has the advantages of lower cost, lower power consumption and thinner thickness than the bottom surface of the LED backlight. Especially with the development of LED technology, the AIInGaP four ceramics and GaN based materials, to achieve LED ultra high brightness and color, the side of the light guide LED backlight can use less number of LED achieve the luminous brightness and color required as possible, play the effect is satisfied. The rapid development of LED technology promote the side of the light guide LED backlight. The following is a brief introduction to the latest development of the principle and design points of LED light source.
Two, side guide light LED backlight structure
Side guide light LED backlight source structure shown in figure 1. It is composed of LED module, light guide plate, scattering film, reflective paper, edge reflective tape etc..
In the backlight module, the light guide plate is a key optical element, it is a piece of transparent plastic poly methyl methacrylate (PMMA) material, the bottom surface coated with white reflection points or injected into a small bump, edge painted with white reflective material or covering a specular metal tape. The scattering film is a semi transparent PC material, which can reduce the brightness and improve the uniformity. Reflective paper is a smooth white paper, light reflection, reduce the role of light leakage.