Optical diaphragm and backlight module using same

Abstract

The present invention relates to an optical diaphragm and a backlight module using the same, wherein the optical diaphragm comprises a substrate and a plurality of first prism structures, the substrate is provided with opposite first and second sides, the first prism structures are arranged on the substrate towards to second side from the first side, each prism structure is provided with a bent wave crest, the bent wave crest has a fluctuation degree, and the fluctuation degree of the first prism structure is gradually reduced from the first side to the second side. The optical diaphragm can enable the center brightness of the whole backlight module to be kept at an original level without influencing the luminosity, and can generate an remarkable nebulization effect on the hot point phenomenon generated by an LED. The backlight module can avoid the problem of scrapping between the optical diaphragms and also can reduce the assembling time of the optical diaphragms and the whole thickness of the backlight module with no need of using a diffusing film.

Description

technical field [0001] The invention relates to an optical film, in particular to an optical film applied to a backlight module. Background technique [0002] The backlight module is one of the key components of the liquid crystal display. Since the liquid crystal panel itself does not have the ability to emit light, the function of the backlight module is to supply sufficient brightness and uniformly distributed light source so that the liquid crystal display can display images normally. At present, liquid crystal displays have been widely used in monitors, notebook computers, digital cameras, projectors and other electronic products with growth potential, thus driving the demand for backlight modules and related components to continue to grow. Generally speaking, the backlight module of a liquid crystal display for displaying images usually includes a diffuser, a brightness enhancement film (BEF), an upper diffuser, and a light source. At present, most of the trends of l...

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Problems solved by technology

[0003] However, light-emitting diodes are point light sources, not linear light sources like traditional cold-cathode tubes. Therefore, the arrangement of light-emitting diodes at intervals will cause the problem of uneven dispersion of light sources, which also causes the phenomenon of hot spots (Hot Spot) in light-emitting diodes. the main cause of

In addition, in order to improve the brightness, the backlight module often places the brightness enhancement film horizontally, but the brightness enhancement film has the effect of image splitting, so the hot spot phenomenon is also indirectly made more serious

Furthermore, under the trend of cost reduction and material integration, the backlight module often integrates the upper diffusion sheet and the brightness enhancement film into a composite film, which also indirectly causes the fogging effect to deteriorate, and also makes the problem of hot spots gradually worsen. Serious, it also causes the user to easily observe the phenomenon of uneven brightness and darkness

Although the liquid crystal display can enlarge the plastic frame in order to cover the hot spot, but this method will cause the display area to become smaller, or the size of the panel module will become larger

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