CN102767803A - A support column for an LED backlight module - Google Patents

Abstract

The invention discloses a support column of an LED backlight module, which is arranged between a back plate and an optical diaphragm of the LED backlight module, the bottom of the support column is fixed on the back plate, LED light sources are arranged on the back plate, the LED light sources are distributed in a centrosymmetric pattern, the support column is positioned in the center of the centrosymmetric pattern, the support column is in a prism or prismatic table structure, and the LED light sources are respectively positioned on a perpendicular bisector of the bottom edge of the side surface of the support column. The LED light sources of the LED backlight module are distributed in a centrosymmetric pattern, the support column is made of transparent materials and is positioned in the center of the centrosymmetric pattern, and the support column is in a prism or prismatic table structure, so that the shadow formed by the support column in the LED backlight module is eliminated, and the cost for solving the shadow is low.

Description

A support column for an LED backlight module

technical field

The invention relates to a support column of a direct-type backlight module in liquid crystal display technology, in particular to a support column of an LED backlight module.

Background technique

Liquid crystal display technology has always been used in portable electronic products such as notebook computers, mobile phones, digital cameras, camcorders, and PDAs. In addition to these smaller portable products, the manufacturing technology of large-size liquid crystal panels has also matured recently. For example, desktop LCD monitors have replaced CRT monitors, and LCD TVs are also replacing traditional TVs with their advantages of light weight and clear pictures. The liquid crystal panel is the most critical display element in this field. However, it does not emit light itself, and needs a backlight source to display images. Many backlight technologies exist today, and in large-size liquid crystal display products above 20 inches, direct-lit backlight modules are often used as the backlight of liquid crystal panels.

The direct type backlight module has the advantages of high cost performance and good optical stability. The basic structure of the direct type LED backlight module includes the LED light source installed at the bottom of the module, the optical film (such as diffuser plate, diffuser sheet, prism sheet, etc.) between support columns. The role of the support column is to provide a certain height of light mixing space for the LED light source, so as to obtain a flat backlight with uniform light output.

In the prior art, the support column of the direct-lit LED backlight module is usually made of white plastic material and conical structure, as shown in Figure 1: the support column 03 of the white conical structure will block part of the light from the LED light source 04 And the shadow 05 will seriously affect the optical uniformity and the visual effect of the module. At present, a common method to solve the dark shadow of the support column of the direct type LED backlight module is to dilute the visual image of the dark shadow by increasing the number of optical films (such as diffusion plates, diffusion sheets, prism sheets, etc.). This method has the following disadvantages:

1. Increasing the number of optical films increases the cost of LED backlight modules;

2. Increasing the number of optical diaphragms reduces the overall brightness of the LED backlight module.

There is an urgent need in the market to develop a support column for an LED backlight module that can not only eliminate shadows but also has a lower cost.

Contents of the invention

In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a support column for an LED backlight module that can eliminate shadows in a direct-type LED backlight module and has low cost.

In order to achieve the above object, the technical solution of the present invention is: a support column of the LED backlight module, which is arranged between the backboard and the optical film of the LED backlight module, the bottom of which is fixed on the backboard, and the LED light source is set On the backplane, the LED light sources are distributed in a centrosymmetric figure, the support column is located at the center of the centrosymmetric figure, the support column is a prism or a prism structure, and the LED light sources are respectively located on the vertical line of the side bottom of the support column superior.

The support column is a transparent material.

The light transmittance of the transparent material is greater than or equal to 50%.

The transparent material is PMMA, PC, PA or glass.

The top of the supporting column is provided with a spherical cap, and the surface of the spherical cap is in a smooth transition with the side of the supporting column.

Claws are provided at the bottom of the support column, positioning holes are provided on the back plate, and the claws pass through the positioning holes on the back plate to fix the support column on the back plate.

A stopper is provided at the bottom of the support column.

With the above structure, the present invention utilizes the LED light sources of the LED backlight module to be distributed in a centrosymmetric pattern, the support column is made of transparent material, and it is located at the center of the centrosymmetric figure, the support column is a prism or a prism structure, and the LED light sources are respectively located on the support The vertical line of the bottom edge of the side of the column realizes the light of the LED light source penetrating the support column, eliminates the shadow formed by the support column in the LED backlight module, and the cost of solving the shadow is low.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment the present invention will be described in further detail:

1 is a schematic diagram of the optical principle of a support column in the prior art;

Fig. 2 is the assembly structure schematic diagram of the present invention;

Fig. 3 is a schematic side view of Fig. 2 of the present invention;

4 is a schematic structural view of Embodiment 1 of a support column of an LED backlight module of the present invention;

5 is a schematic structural view of Embodiment 2 of a support column of an LED backlight module of the present invention;

FIG. 6 is a schematic diagram of the optical principle of a support column of an LED backlight module according to the present invention.

Detailed ways

As shown in one of Figures 2-6, the supporting column of the LED backlight module of the present invention is arranged between the backplane 1 and the optical film 2 of the LED backlight module, and its bottom is fixed on the backplane 1. The LED light source 4 is arranged on the back plate 1, the LED light source 4 is distributed in a centrosymmetric figure, the support column 3 is located at the center of the centrosymmetric figure, the support column 3 is a prism or a prism structure, and the LED light sources 4 are respectively located The vertical line on the bottom edge of the support column 3 sides.

The support column 3 is a transparent material.

The light transmittance of the transparent material is greater than or equal to 50%.

The transparent material can be PMMA (also known as polymethyl methacrylate), PC (also known as polycarbonate), PA (also known as polyamide) or glass, and of course the transparent material can also be other organic materials. Polymer materials, transparent inorganic materials or transparent composite materials, etc.

The top of the supporting column 3 is provided with a spherical cap 31 , and the surface of the spherical cap 31 and the side of the supporting column 3 are in a smooth transition.

A claw 32 is provided at the bottom of the support column 3 , and a positioning hole 11 is provided on the backboard 1 , and the claw 32 passes through the positioning hole 11 on the backplane 1 to fix the support column on the backplane 1 .

A stopper 33 is provided at the bottom of the support column 3 , and the stopper 33 can better fix the support column 3 on the backboard 1 and limit the rotation of the support column 3 .

With the above structure, the support column 3 is a prism or prism structure, and the LED light source 4 is set corresponding to the vertical line of the side bottom of the support column 3, and the support column 3 is made of a transparent material, so that the light of the LED light source 4 can pass through the support column smoothly. 3, without forming dark shadows in the LED backlight module.

As shown in Figure 6: a schematic diagram of the optical principle of the present invention, because the support column 3 is a prism or truncated prism structure, because its side is a plane, and each LED light source 4 is arranged on the vertical line of each side bottom edge of the support column 3, Therefore, it is favorable for the penetration of light, thereby eliminating the shadow of the support column 3 .

Example 1

As shown in FIG. 4 , the support column 3 is a schematic arrangement position of a quadrangular prism or a prism relative to the LED light source 4 .

Example 2

As shown in FIG. 5 , the support column 3 is a schematic arrangement position of the hexagonal prism or prism relative to the LED light source 4 .

Claims (7)

1. a support column of an LED backlight module, which is arranged between the backboard and the optical diaphragm of the LED backlight module, its bottom is fixed on the backboard, and the LED light source is arranged on the backboard, characterized in that: The LED light sources are distributed in a centrosymmetric figure, the support column is located at the center of the centrosymmetric figure, the support column is a prism or a prism structure, and the LED light sources are respectively located on the vertical line of the side bottom of the support column. 2. The support column of an LED backlight module according to claim 1, wherein the support column is made of a transparent material. 3 . The support column of an LED backlight module according to claim 2 , wherein the light transmittance of the transparent material is greater than or equal to 50%. 4 . 4. The support column of an LED backlight module according to claim 2, wherein the transparent material is PMMA, PC, PA or glass. 5 . The supporting column of an LED backlight module according to claim 1 , wherein a spherical cap is provided on the top of the supporting column, and the surface of the spherical cap and the side of the supporting column are in a smooth transition. 6. A support column for an LED backlight module according to claim 1, wherein a claw is provided at the bottom of the support column, a positioning hole is provided on the back plate, and the claw passes through the positioning hole on the back plate. The holes fix the support columns on the backboard. 7. The support column of an LED backlight module according to claim 1, wherein a stopper is provided at the bottom of the support column.

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