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Back light unit

A technology of backlight module and light guide plate, applied in the directions of optics, light guide, light source, etc., can solve the problems of uneven illumination of surface light source, can not completely eliminate dark areas, etc., and achieve the effect of low cost, reduced quantity, and uniform brightness

Inactive Publication Date: 2014-10-15
HB TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, if this technology is applied to a large TV larger than the display, the distance between the LED light sources will become wider. The previous design of the sawtooth structure not only cannot completely eliminate the dark area, but also depends on the conditions such as the processing state of the sawtooth structure. Secondary problems such as unevenness of illuminance

Method used

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Effect test

no. 1 example

[0036] Figure 1a It is a main plan view of the backlight module corresponding to the first embodiment of the present invention, including a light guide plate (300) and an LED light source (L). Figure 1b to Figure 1d for illustration Figure 1a In the light guide plate (300) shown in , according to the light diffusion effect and the effect of preventing the dark area according to the inclination angle (θ1, θ2) of the microstructure (G1, G2) for preventing the dark area, Figure 1e to represent Figure 1a A diagram showing the relationship between the width (W) and the height (P) of the dark area prevention microstructures (G1, G2) in the light guide plate (300).

[0037] First refer to Figure 1a The backlight module in the first embodiment of the present invention repeatedly forms a plurality of anti-dark area microstructure combinations (310) on the incident surface of the light guide plate (300) adjacent to the LED light source (L) to prevent dark area (dark area).

[0038...

no. 2 example

[0052] figure 2 It is a main plan view of a backlight module corresponding to the second embodiment of the present invention, including a light guide plate (400) and an LED light source (L).

[0053] refer to figure 2 It can be seen that, in the backlight module corresponding to the second embodiment of the present invention, in addition to repeatedly forming a plurality of anti-dark area microstructure combinations (410) on the incident surface of the light guide plate (400), and preventing dark area microstructure combinations (410) In addition to forming a sawtooth-shaped anti-dark area microstructure (G1, G2, G3) with three different inclination angles (θ1, θ2, θ3), and Figure 1a The backlight modules shown are the same.

[0054] Such as figure 2 As shown, if the anti-dark area microstructures (G1, G2, G3) with three different inclination angles (θ1, θ2, θ3) are repeatedly formed on the incident surface of the light guide plate (400), the same as having two different...

no. 3 example

[0057] image 3 It is a main plan view of a backlight module corresponding to the third embodiment of the present invention, including a light guide plate (500) and an LED light source (L).

[0058] refer to image 3 It can be seen that, in the backlight module corresponding to the third embodiment of the present invention, in addition to repeatedly forming a plurality of anti-dark area microstructure combinations (510) on the incident surface of the light guide plate (500), and preventing dark area microstructure combinations (510) In addition to forming elliptical shapes with different curvature radii (R1, R2) to prevent dark area microstructures (G1', G2'), and Figure 1a The backlight modules shown are the same.

[0059] Here, the above microstructures (G1', G2') for preventing dark areas should use at least one of laser processing, hot stamping processing, injection molding, and ultrasonic processing to form different curvature radii (R1 , R2), this is because if the ra...

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Abstract

A backlight unit with a light guide plate preventing the dark area between light emitting diodes (LEDs) is provided, wherein a plurality of dark area-preventing patterns formed on an incidence plane of a light guide plate and having different angles of inclination or different radii of curvature may evenly diffuse lights incident from an LED even under the condition that the gap between the LEDs is relatively broad and greater than or equal to the width of an LED and thus, uniform brightness may be obtained without an occurrence of a dark area. Accordingly, the number of the LEDs may be decreased and the backlight unit may be fabricated with a relatively low cost.

Description

technical field [0001] The invention relates to a backlight module with a light guide plate for preventing dark areas between LED (Light Emitting Diode) light sources. Specifically, the present invention relates to a microstructure for preventing dark areas including various inclination angles and curvature radii on the incident surface of a light guide plate adjacent to an LED light source in a photometric (edge) backlight module, thereby A technology that achieves the effect of no dark area and uniform brightness. Background technique [0002] Generally speaking, the Light Guide Panel (Light Guide Panel) provides a path for the uniform emission and diffusion of light emitted from the light source, and is applied to the Backlight Unit (BLU). It is mainly used in non-emissive displays such as liquid crystal displays or Light box signs and other devices. [0003] According to the content of Japanese Patent Publication No. 2004-325959 using the backlight module, the light em...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21S8/00F21V8/00F21V19/00F21Y101/02
CPCG02B6/0073G02B6/0018G02B6/0016G02B6/0068
Inventor 柳忠烨朴大成李承根
Owner HB TECH CO LTD
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