LED lens used for direct type liquid crystal backlight

Abstract

The invention discloses an LED (Light Emitting Diode) lens used for a direct type liquid crystal backlight, which comprises a base, a first optical part and a second optical part, wherein the base is provided with a basal surface and a first inner side surface; the first optical part comprises an outer side surface and an inner side surface; the outer side surface comprises a first outer side surface and an outer convex surface connected with the first outer side surface; the inner side surface comprises a second inner side surface and a first top concave surface formed by sinking downwards to the center along the top periphery of the second inner side surface; the second optical part comprises a second outer side surface, a top surface and a top convex surface formed by sinking downwards from the periphery to the center along the top surface; and a sunken second top concave surface is formed at the lower end part of the top convex surface. The LED lens has the advantages that light extraction angle of the lens is large; the light spot is enabled to be bigger and uniform; so that the quantity of the LEDs in the backlight module can be reduced; the interval between a diffuser plate and the LED can be reduced; the thickness of the backlight module can be reduced; the H / D value can be effectively reduced; the backlight is enabled to be lighter; and meanwhile the manufacturing cost can be reduced.

Description

technical field [0001] The invention relates to an LED lens, in particular to an LED lens used for a direct type liquid crystal backlight. Background technique [0002] Traditional cold-cathode tube (CCFL) backlights for liquid crystal displays have been gradually replaced by light-emitting diode (LED) backlights. However, unlike the line light source cold cathode tube, LED is a point light source that emits a beam of light at a certain angle. When it is used as a direct-type liquid crystal display (LCD) backlight, hundreds of settings and thousands of three primary color LEDs are arranged in a certain array to form a surface light source. , and then illuminate the LCD panel. [0003] The existing LED direct-lit LCD TV backlight usually adds a lens in front of the LED, and performs secondary light distribution on the light from the LED through the lens, so as to reduce the thickness of the backlight module and the amount of LED used, and at the same time meet the requiremen...

AI Technical Summary

Problems solved by technology

At present, the direct-type backlight LED lens on the market has a small light emission angle, and the formed light spot is small. The distance between the LEDs is D, and the distance between the bottom of the LED and the diffusion plate is H. The existing direct-type LCD backlight module has a H / D value Generally around 0.3, the number of LEDs is large, and the thickness of the backlight module is relatively large, so its manufacturing cost is relatively high

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