Refraction and reflection light emitting device

Abstract

The invention discloses a refraction and reflection light emitting device. The divergence angle of an LED (light emitting diode) light beam is increased by a refraction and reflection optical lens with the special design, and therefore the radiation area of a single LED light source is enlarged. Furthermore, a reflector plate with the high reflectivity is cooperated with the refraction and reflection optical lens to finish big-angle optical diffusion, and the light energy use ratio is improved. Compared with the traditional bottom lighting type LED backlight module, the bottom lighting type LED backlight module applying the refraction and reflection light emitting device disclosed by the invention has the following advantages: (1) the number of the required LEDs can be reduced so as to increase a Pitch value, lower a duty ratio and lower the cost; (2) because few LEDs are used, the light color consistency of the LED can be better controlled, and the picture quality of the backlight product is improved; (3) the light energy use ratio and the backlight module luminance are improved; (4) the space occupied by the single LED is increased, thereby being favorable for heat loss, lowering the temperature of the backlight module, and prolonging the service life of the LED and the backlight module.

Description

technical field [0001] The invention relates to the fields of display and illumination, in particular to a catadioptric light emitting device. Background technique [0002] In recent years, the direct-lit type has gradually penetrated into the backlight field, and the fundamental driving force for it to replace the side-lit type is low cost. In the field of direct-lit backlights, existing technical solutions are realized by using large-angle optical lenses in combination with reflective sheets, diffusion plates, diffusion sheets and other film materials, such as figure 1 . However, the duty ratio H / P that can be achieved by this backlight solution is mostly 0.3 or higher (H refers to the distance between the PCB board and the diffuser plate, and P refers to the distance between the light source and the light source in the direct-down solution). [0003] The existing direct-lit backlight solutions have the following disadvantages: (1) Many LEDs are required. For example, fo...

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Problems solved by technology

[0003] The existing direct-lit backlight solutions have the following disadvantages: (1) Many LEDs are required. For example, for a 32-inch TV, at least 20 or 30 LEDs with medium power are required, and the cost is still high; (2) LED The number of LEDs used is too large, which leads to the increase of the number of LED strips used, that is, the number of PCB boards, which increases the cost; (3) the number of LEDs used is large, and in the same size space, the heat emitted is too much, which cannot be dissipated in time, which affects the performance of LEDs. service life

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