LED backlighting structure provided with converted light source and using free-form surface reflector

Abstract

The invention relates to an LED backlighting structure provided with a converted light source and using a free-form surface reflector, which comprises a backlighting cavity (4) and an LED light source (1), the bottom of the backlighting cavity (4) is a reflecting surface (2) of a free-form surface, the backlighting cavity (4) is a sealed cavity which is composed of the reflecting inner wall thereof, the reflecting surface (2) of the free-form surface at the bottom and a diffuser film (5) arranged on the top thereof, the diffuser film (5) is provided with a brightness enhance film and other optical films and an LCD panel; the LED light source (1) is fixed in the backlighting cavity (4) through a light source support bracket (3) and is positioned below the diffuser film (5) and right above the axis of the reflecting surface (2) of the free-form surface at the bottom of the backlighting cavity (4), and the emergent direction of light deviates from the LCB panel. The structure has the advantages of large light emergent angle of the light source, small thickness of the whole backlighting system and high whole light effect.

Description

technical field [0001] The invention relates to a backlight system, in particular to an LED backlight structure with an inverted light source and a free-form reflector. technical background [0002] In recent years, with the development of consumer electronic products, the market for flat panel displays has grown larger and larger, wherein liquid crystal displays (Liquid Crystal Display, LCD) account for nearly 90% of the flat panel displays. As a passive light-emitting device, liquid crystal display does not emit light by itself. For transmissive liquid crystal display, it must rely on the backlight source to pass light through the display panel to display graphic images. Cold Cathode Fluorescent Lamp (CCFL) and Light Emitting Diodes (LED) are currently two main technologies of liquid crystal backlight. The main advantages of LED backlights are: good color reproduction, low energy consumption, long life, fast response, better electrical and optical control performance, no ...

AI Technical Summary

Problems solved by technology

[0006] In order to reduce the thickness of distributed LED direct-lit backlight, a technical solution is to increase the arrangement density of distributed LEDs, which can reduce the thickness of the system to a certain extent, but this technical solution will lead to a sharp increase in the number of LEDs , the number of LEDs used in 22-inch panels has exceeded 1,000, which will bring a series of problems such as light source consistency, reliability, and power drive; another method is to use secondary lenses to increase the light output angle of LEDs, which can also reduce the system Thickness, at present, free-form surface lenses with precise optical design have been applied to LED backlights, but when using secondary lenses to change the direction of light exit, due to the existence of total internal reflection, the light exit angle cannot be increased too much, and the backlight The degree of system thickness reduction is also limited, and there is still a certain gap compared with side-lit backlights

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