Single-free-form-surface thick lens with short-distance uniform light effect and array thereof

Abstract

The invention provides a single-free-form-surface thick lens with short-distance uniform light effect and an array thereof, and relates to the technical field of secondary optical elements of light sources such as cold cathode fluorescence lamps and LEDs. One surface of the lens is an optionally set curved surface while the other surface of the lens is a free-form surface. In a second optical element, front surfaces and rear surfaces of the lens and the array thereof refract light to control a travelling direction of the light, and thicknesses of the lens and the array determine offset of the light in a radial direction of the lens, so that after emitted light of light sources such as a cold cathode fluorescence lamp and an LED passes the lens, energy on a test surface is specific in spatial distribution, and angle of divergence of reshaped light beams can be partially controlled. The lens and the array thereof can reshape the emitted light of the light sources such as the cold cathode fluorescence lamp and the LED to obtain the light beams excellent in directivity and uniformity. By applying the lens and the array to the fields of backlights of side-disturbance-free uniform lighting and liquid crystal display and the like, lighting effect can be improved remarkably, and uniform light distance is shortened.

Description

technical field [0001] The invention relates to the technical field of secondary optical elements of light sources such as LEDs, and more specifically relates to a single free-form thick lens with a short-distance uniform light effect and an array thereof. Background technique [0002] In the fields of general lighting and public display, traditional light sources (such as cold cathode fluorescent lamps, etc.) and new light sources (such as LEDs, etc.) are widely used. In recent years, with the development of liquid crystal display technology and the maturity of related products, cold cathode fluorescent lamps and LEDs are increasingly used as backlight sources in liquid crystal displays. In particular, LED, as a new generation of light source, has small size, long life, good color rendering, low power consumption, and high luminous efficiency, which is more in line with the current concept of green environmental protection, so its application scope ranges from the initial s...

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Problems solved by technology

These deficiencies severely limit its application in liquid crystal backlight displays. The reason is that the transmittance of liquid crystal panels to large-angle incident light is not high, so if the beam divergence angle is too large, the energy utilization rate will be significantly reduced; and the required If the uniform light distance is too long, it is not conducive to the miniaturization of the display module, and it is difficult to obtain ultra-thin products; in special applications (such as outdoor extremely high-brightness lighting display, specific viewing angle display, uniform lighting in a three-dimensional space, etc.), the beam energy The angular distribution of the lens has relatively strict requirements, and this type of lens cannot meet the

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