Lens, backlight module and liquid crystal display device

Abstract

The invention discloses a lens. The lens includes a top surface and a bottom surface disposed oppositely, and side walls for connecting the top surface and the bottom surface; the bottom surface is located on the side, facing a lamp panel, of the lens, and light emitting diode chips are placed between the bottom surface and the lamp panel; the cross-sectional profiles of the side walls in any plane parallel to the bottom surface include four arc-shaped sections which are connected end to end in turn, the center of the cross-sectional profile and intersection points of two adjacent arc-shaped sections are connected into a line as a first straight line, and an included angle between the first straight line and tangent lines of the arc-shaped sections is smaller than a critical internal totalreflection angle of the lens; the bottom surface is a light incident surface, and the side walls are light emitting surfaces. The invention also discloses a backlight module and a liquid crystal display device. According to the lens, brightness of emitted lights is in a square distribution, brightness of lights in an overlapping area of the adjacent light emitting diode chips is relatively large,and the number of the light emitting diode chips to be used in the same area is small, thereby reducing production and maintenance costs of the backlight module.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a lens, a backlight module and a liquid crystal display device. Background technique [0002] Liquid Crystal Display (LCD) has an irreplaceable position in modern display devices, and it is widely used in display devices of portable mobile electronic products, such as mobile phones, digital cameras, handheld computers, GPRS and other mobile products. The liquid crystal display is generally provided by a backlight module to illuminate the liquid crystal display panel to display images. The light source of the direct-lit backlight module is provided by self-illuminating light emitting diode (Light Emitting Diode, LED) chips arranged on the light board. In the direct type backlight module, LED chips are often used together with a secondary lens to ensure fewer LED chips in the same area. [0003] In the prior art, the light emitting diode chip is matched with the commonly used sec...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a lens, a backlight module and a liquid crystal display device, which are used to solve the problem of insufficient light in the overlapping area when multiple light-emitting diode chips are spliced ​​together in the prior art, uneven light mixing effect, and light-emitting diode chips. The problem of small distances between

Images