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Direct type backlight module and liquid crystal display device

A backlight module, direct type technology, applied to lighting devices, fixed lighting devices, components of lighting devices, etc., can solve the problems of large thickness of direct type backlight structures, use a lot, increase the cost of liquid crystal display devices, etc. The effect of power consumption and light mixing distance, increasing luminous efficiency, and reducing light mixing height

Active Publication Date: 2015-07-01
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the continuous expansion of liquid crystal display panels, the side-light backlight structure is limited by the optical distance and other reasons, which can no longer meet the needs of liquid crystal display devices. It is suitable for liquid crystal display devices with large panels. However, the thickness of the direct-lit backlight structure is generally relatively large, and a large number of LEDs (light-emitting diodes) are required, which increases the cost of the liquid crystal display device.

Method used

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  • Direct type backlight module and liquid crystal display device
  • Direct type backlight module and liquid crystal display device
  • Direct type backlight module and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] In this embodiment, the width of the LED light bar 11 is L3, the thickness of the LED light bar 11 is H3, the diameter of the first refraction structure 14 is L1, the diameter of the second refraction structure 12 is L2, the legs 16 and the LED light bar 11 The height difference is H1, and the height of the secondary lens structure 17 is H2. The first refraction structure 14 is a cone, the cone angle is Φ; the second refraction structure 12 is arc spherical, and the radius of curvature is R; wherein, the first refraction structure 14 and the second refraction structure 12 are made of optical glass BK7, All parameters meet the following conditions:

[0052] L1=2.5L2, L2=1.8L3, H1=0.2H3, cone angle Φ=135°, R=5H3, H2 can be set according to L1, L2, Φ, R.

[0053] Such as Figure 4 As shown, the light distribution curve of the LED light bar in the existing backlight module is a Lambertian distribution, and the angle of the strongest light intensity is 0°; Figure 5 As sh...

Embodiment 2

[0056] In this embodiment, the width of the LED light bar 11 is L3, the thickness of the LED light bar 11 is H3, the diameter of the first refraction structure 14 is L1, the diameter of the second refraction structure 12 is L2, the legs 16 and the LED light bar 11 The height difference is H1, and the height of the secondary lens structure 17 is H2. The first refraction structure 14 is a cone, the cone angle is Φ; the second refraction structure 12 is arc spherical, and the radius of curvature is R; wherein, the first refraction structure 14 and the second refraction structure 12 are made of optical glass BK7, All parameters meet the following conditions:

[0057] L1=2L2, L2=1.5L3, H1=0.2H3, cone angle Φ=135°, R=5H3, H2 can be set according to L1, L2, Φ, R.

[0058] Depend on Figure 8 It can be seen that when both L1 and L2 are at the limiting limit, the light emitted by the LED light strip at a large angle is not captured by the second refraction structure, so there will be...

Embodiment 3

[0061] In this embodiment, the width of the LED light bar 11 is L3, the thickness of the LED light bar 11 is H3, the diameter of the first refraction structure 14 is L1, the diameter of the second refraction structure 12 is L2, the legs 16 and the LED light bar 11 The height difference is H1, and the height of the secondary lens structure 17 is H2. The first refraction structure 14 is a cone, the cone angle is Φ; the second refraction structure 12 is arc spherical, and the radius of curvature is R; wherein, the first refraction structure 14 and the second refraction structure 12 are made of optical glass BK7, All parameters meet the following conditions:

[0062] L1=2.5L2, L2=1.8L3, H1=0.2H3, cone angle Φ=160°, R=5H3, H2 can be set according to L1, L2, Φ, R.

[0063] Depend on Figure 9 It can be seen that when other parameter settings are the same as those in Example 1, when the cone angle of the first refraction structure is set at the maximum allowable value, the modulati...

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Abstract

A direct type backlight module and a liquid crystal display device. The direct type backlight module comprises a back panel, a backlight source arranged on the back panel, and a plurality of secondary lens structures (17) which are arranged on the back panel and located above the backlight source, wherein the backlight source comprises a plurality of LED light bars (11); and the secondary lens structures (17) are axisymmetric structures and are arranged in a manner of one-to-one correspondence with the LED light bars (11), and the axis of the secondary lens structures (17) coincides with that of the LED light bars (11) corresponding thereto. Therefore, the optical efficiency of the backlight module can be improved, the number of LEDs can be reduced, and the light mixing distance of the direct type backlight module can be reduced, thereby realizing the ultrathin design of the backlight module.

Description

technical field [0001] The invention belongs to the field of liquid crystal display, and in particular relates to a direct type backlight module and a liquid crystal display device. Background technique [0002] With the rapid development of display technology, liquid crystal display devices (such as liquid crystal TV, liquid crystal display, liquid crystal display, etc.) It has been widely used in production and life. [0003] However, the liquid crystal display device is a passive display device, which cannot emit light by itself, and needs to modulate external light to achieve the purpose of display. With the continuous expansion of liquid crystal display panels, the side-light backlight structure is limited by the optical distance and other reasons, which can no longer meet the needs of liquid crystal display devices. However, the thickness of the direct-type backlight structure is generally relatively large, and a large number of LEDs (light-emitting diodes) are requi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F21S8/00F21V5/04G02F1/13357F21Y101/02
CPCG02F1/133603G02F2001/133607G02F1/133607G02F1/133606
Inventor 孙艳六
Owner BOE TECH GRP CO LTD
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