Large-size LED (light emitting diode) panel lamp with novel light guide plate

Abstract

The invention provides a large-size LED (light emitting diode) panel lamp with a novel light guide plate, relates to the field of LED lighting and belongs to the LED panel lamp using a plurality of groups of flat glass and polymer thin films as the light guide plate through superposition. A plurality of groups of flat glass and polymer thin films are used as the light guide plate through superposition, wherein the flat glass adopts glass materials with high refractive index, the nd value is greater than 1.6, and the polymer thin films adopt transparent materials with lower refractive index, so each layer of glass becomes a light guide layer, and in addition, the light guide distance is longer. The large-size LED panel lamp has the characteristics that the structure is simple, the mechanical intensity is high, the deformation cannot easily occur, the photo-ageing resistance is realized, and the absorption rate on UV (ultravioletb) light is high.

Description

Technical field [0001] The present invention relates to an LED panel light, in particular to an LED panel light which uses multiple sets of flat glass and polymer film as a light guide plate. Background technique [0002] As a ceiling lamp, LED panel lights are widely used in indoor lighting for homes, offices and shopping malls. The current LED panel light usually has a side light emitting structure, that is, the LEDs are arranged in a linear array on both sides of the panel light, and the light emitting direction of the LEDs is facing the PMMA (acrylic) light guide plate. Above the PMMA light guide plate is a PC diffuser plate, and the surface of the diffuser plate has a granular structure. On the diffuser is reflective paper. When light enters the PMMA light guide plate, due to the light guide effect, the light continues to propagate along the inside of the light guide plate. When encountering the diffuser, the light is scattered, a part of the light travels downward throug...

AI Technical Summary

Problems solved by technology

First of all, PMMA material is prone to photoaging, and the light guiding performance of the light guide plate will decrease significantly after 2 to 3 years of use, thus affecting the brightness of the panel light

In addition, since the refractive index of PC and PMMA is not much different, the total reflection effect at the interface between the light guide plate and the diffuser plate is poor, resulting in the inability of light to travel a long distance in the light guide plate.

Therefore, in order to ensure the uniformity of light emission on a certain surface, the current LED panel lights cannot be made into large sizes.

Secondly, PMMA material has a high transmittance to UV (ultraviolet) light. When it is illuminated by white LED, most of the ultraviolet band emitted by the LED will not be absorbed. UV light will cause certain damage to human eyes when used for a long time

In addition, from the perspective of the mechanical properties of plastics, both PC and PMMA are prone to moisture absorption and deformation, which also limits the use of large-area panels.

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