CN101256301A - Backlight module with high uniform brightness - Google Patents

Abstract

The invention relates to a backlight module with high uniform brightness, which mainly solves the problem and limitation that the prior backlight module can not effectively solve the brightness deficiency and uniformity.

Description

Backlight module with high uniform brightness

technical field

The invention relates to a backlight module applied to a liquid crystal panel, in particular to a reflective plate design of the backlight module capable of improving reflection efficiency and uniform luminance.

Background technique

Please refer to FIG. 4, the backlight module 90 generally used in the liquid crystal panel 50 mainly includes a light guide plate (LGP) 91, a reflector 92 located under the light guide plate 91, and a reflector 92 located on the side of the light guide plate 91. The light source device 93 at the top of the light guide plate 91, and an optical film (Prism sheet) 94 above the light guide plate 91; like this, after the light source provided by the light source device 93 is incident on the light guide plate 91, it passes through the conduction and reflection sheet 92 of the light guide plate 91 reflection, refract light to the liquid crystal panel 50 above the backlight module 90 to provide the light required by the liquid crystal panel 50, and in order to maintain the light uniformity of the entire liquid crystal panel 50, the upper and lower sides of the liquid crystal panel 50 respectively A diffuser (Diffuser) 51 is provided.

Among them, in order to increase the luminance of the light source of the liquid crystal panel 50, many manufacturers have proposed a method of adding a plurality of prism sheets above the light guide plate 91, but such a method of adding prism sheets will cause troublesome assembly, time-consuming, high cost, and Problems such as increased weight and volume and power loss are obviously not an appropriate solution; moreover, please refer to Taiwan Patent Certificate No. I247142 "Light Guide Plate for Backlight Module", No. M243654 "Backlight System", M266469 No. "Reflector structure of direct-type backlight module to improve reflection and uniform brightness", No. M286939 "Backlight module with high efficiency, high luminance and low board cost" and No. M300824 "Structure improvement of light guide plate", etc., Many manufacturers have proposed to install various light guide structures in the form of concavo-convex configurations on the surface of the light guide plate or reflector to increase the luminance of the light source of the backlight module by improving the uniform refraction of light. However, this changes the surface of the light guide plate or reflector. The shape method will cause problems such as difficulty in manufacturing the light guide plate, increase in weight and volume, and high mold cost, which is still not a good solution.

Contents of the invention

The object of the present invention is to provide a backlight module with high uniform luminance, which can solve the defects of the existing liquid crystal panel backlight module, and can simply and effectively improve the uniform luminance of light in the backlight module.

The object of the present invention is achieved in this way, a backlight module with high uniform brightness, the backlight module includes:

a light guide plate;

A reflective sheet, arranged below the light guide plate and on the surface facing the direction of the light guide plate, a plurality of reflective bead layers are distributed, and the surface layer of each reflective bead layer is provided with a plurality of granular reflective beads, each reflective bead is bonded to and positioned on the reflective sheet with an adhesive layer;

More than one light source device arranged on the side of the light guide plate.

An optical film is arranged above the light guide plate.

The arrangement density of each reflective bead layer increases as the distance from the light source device increases.

The distance between adjacent reflective bead layers decreases as the distance from the light source device increases.

The area of the reflective bead layer increases as the distance from the light source device increases.

In the backlight module with high uniform brightness of the present invention, a plurality of reflective bead layers are distributed on the surface of the reflective sheet of the backlight module by printing or pasting, and a plurality of reflective bead layers are evenly distributed on the surface of each reflective bead layer. The granular reflective beads that reflect the incident light back to the light guide plate can effectively improve the light source efficiency and uniform brightness of the backlight module in the simplest way, and have deep industrial applicability.

The advantages and efficiency improvements that can be obtained by the backlight module with high uniform luminance of the present invention include at least:

1. The reflective bead layer of the present invention is directly distributed and arranged on the surface of the reflective sheet by printing or pasting, and the processing is very simple and easy, and the manufacturing cost is low.

2. The present invention directly prints and distributes multiple reflective bead layers on the surface of the reflective sheet, which can not only improve the light source efficiency and uniform brightness of the backlight module, but also hardly increase the weight and volume of the backlight module. It has great industrial utilization value.

3. In the present invention, a plurality of reflective beads are evenly arranged in each reflective bead layer, and the incident light can be reflected and guided back to the light guide plate with the best efficiency by utilizing the spherical granular reflective beads to gather light, increase light and reflect. Greatly improve the light source efficiency of the backlight module.

4. The present invention can flexibly change the pattern shape and distribution form of each reflective bead layer to meet the needs of product design, greatly improving the variability and diversification of product design.

Description of drawings

Figure 1: Schematic diagram of the structural configuration of a preferred embodiment of the present invention.

Fig. 2: A three-dimensional schematic diagram of a reflective sheet provided in a preferred embodiment of the present invention.

Fig. 3: Schematic cross-sectional view of the structure of the reflection sheet provided in the preferred embodiment of the present invention.

Figure 4: Schematic diagram of the structural configuration of an existing backlight module.

Figure number:

10 Backlight module 11 Light guide plate

12 Reflectors 122 Substrates

124 reflective layer 13 light source device

14 optical film

20 reflective bead layer 21 reflective bead

22 adhesive layer

50 LCD panel 51 Diffusion plate

90 backlight module 91 light guide plate

92 reflector 922 substrate

924 reflective layer 93 light source device

94 optical film

Detailed ways

A preferred embodiment of the backlight module with high uniform luminance provided by the present invention is shown in FIG. The light source device 13 at the end of both sides of the light guide plate 11 is constructed, and an optical film 14 can be further arranged above the light guide plate 11; wherein:

The light guide plate 11 is a light-permeable plate with the equivalent performance of conducting and scattering uniform light;

The reflector 12 is arranged under the light guide plate 11 to reflect the light exposed on the bottom surface of the light guide plate 11 back to the light guide plate 11, as shown in Figure 2 and Figure 3, the reflector 12 is provided with a rigid or flexible The base material 122 is coated with a reflective layer 124 made of diffuse reflective material on the surface of the base material 122 facing the direction of the light guide plate 11, and according to the needs of product design and the position of each light source device 13, it can be printed or pasted, etc. way, a plurality of reflective bead layers 20 are distributed on the surface of the reflective layer 124 of the reflective sheet 12, as shown in Figure 3, the surface layer of each reflective bead layer 20 is evenly distributed with a plurality of spherical granular reflective beads 21, each reflective The beads 21 are bonded and fixed on the surface of the reflective sheet 12 by using the adhesive layer 22, and the spherical particle-shaped reflective beads 21 are used for concentrating and increasing light to effectively reflect the light exposed on the bottom surface of the light guide plate 11 and guide it back through with the best efficiency. The light guide plate 11 is projected onto the liquid crystal panel 50;

The pattern shapes and distribution configurations of the aforementioned reflective bead layers 20 are not specifically limited in the present invention. Generally, the distribution configuration configurations of each reflective bead layer 20 vary according to the distance from the light source device 13. For example, it can vary with the light source device 13 The increase of the distance reduces the spacing between adjacent reflective bead layers 20 or increases the area of the reflective bead layer 20, that is, the arrangement density of each reflective bead layer 20 is increased as the distance from the light source device 13 increases, as shown in the figure. Each reflective bead layer 20 of the embodiment is arranged in parallel strips, and the distance between adjacent reflective bead layers 20 decreases as the distance from the light source device 13 increases;

The light source device 13 is arranged at the side end of the light guide plate 11, and it can be implemented by more than two light-emitting diodes (LEDs) arranged at intervals or a cold cathode lamp (CCFL) in a linear form, so as to provide a liquid crystal display. the required light source;

The optical film 14 is disposed on the top of the light guide plate 11 , and the uniform brightness of the backlight module 10 can be further improved by the scattering and homogenizing effect of the optical film 14 .

As shown in Fig. 1, Fig. 2 and Fig. 3, when the light source of the light source device 13 enters the light guide plate 11, most of the light source can be directly transmitted to the liquid crystal panel 50 through the conduction and scattering of the light guide plate 11. The light exposed from the bottom surface of the light guide plate 11 can further uniformly scatter the light source back through the light guide plate 11 by taking advantage of the light concentrating, light enhancement and reflection functions of each reflective bead layer 20, and the reflection effect produced by the reflective sheet 12 and the reflective layer 124. Projecting towards the liquid crystal panel 50, not only can efficiently conduct and project the light source of the light source device 13 to the liquid crystal panel 50, but also greatly improve the uniform brightness of the liquid crystal panel 50, as shown in the preferred embodiment of Figure 1, the present invention It is only necessary to arrange a diffuser plate 51 under the liquid crystal panel 50 to generate sufficient uniform brightness, effectively providing practical effects such as reducing cost and reducing the volume and weight of the liquid crystal display.

Although the present invention has been disclosed with specific embodiments, it is not intended to limit the present invention. Any person skilled in the art can make replacements of equivalent components without departing from the concept and scope of the present invention, or replace them according to the present invention. The equivalent changes and modifications made in the scope of patent protection shall still fall within the scope of this patent.

Claims (5)

1. the module backlight of a tool high uniform brilliance is characterized in that this module backlight comprises:

One light guide plate;

One reflector plate, be located at the below of this light guide plate and in surface towards this light guide plate direction, be distributed with most reflecting beads layers, the top layer of each reflecting beads layer is distributed with most granular reflecting beads, and each reflecting beads is in conjunction with being positioned this reflector plate with a bonding coat;

Be located at the light supply apparatus of this light guide plate side more than one.

2. the module backlight of tool high uniform brilliance as claimed in claim 1 is characterized in that: in the top of described light guide plate one blooming piece is set.

3. the module backlight of tool high uniform brilliance as claimed in claim 1 or 2 is characterized in that: the density that is provided with of described each reflecting beads layer is along with the increase of the distance of described light supply apparatus and improve.

4. the module backlight of tool high uniform brilliance as claimed in claim 3 is characterized in that: the spacing of adjacent described reflecting beads layer is to increase and dwindle along with the distance with described light supply apparatus.

5. the module backlight of tool high uniform brilliance as claimed in claim 3 is characterized in that: the area of described reflecting beads layer is along with the distance with described light supply apparatus increases and increases.

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