Directly-lit LED backlight module and liquid crystal display

A backlight module, direct type technology, applied in the field of direct type LED backlight modules and liquid crystal displays, can solve the problems of poor brightness and color coordinate consistency, and achieve the effects of simplifying the production process, avoiding absorption, and saving packaging costs.

Inactive Publication Date: 2011-07-13
SKYWORTH LCD SHENZHEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a direct type LED backlight module, which aims to solve the problem

Method used

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  • Directly-lit LED backlight module and liquid crystal display
  • Directly-lit LED backlight module and liquid crystal display
  • Directly-lit LED backlight module and liquid crystal display

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0014] Example one:

[0015] figure 1 The structure diagram of the direct type LED backlight module provided by the first embodiment of the present invention is shown. For ease of description, only the parts related to this embodiment are shown.

[0016] The direct type LED backlight module includes an LED chip 1 and a printed circuit board 2. The LED chip 1 is arranged on the front of the printed circuit board 2 and emits light through electrical connection with the printed circuit board 2. Among them, the LED chip 1 is a bare chip, and no fluorescent glue is encapsulated on the outside. A light guide plate 3 with high light transmittance is provided in the light emitting direction of the LED chip 1, and the light guide plate 3 contains uniformly distributed fluorescent excitation materials 31. The excitation light emitted by the LED chip 1 enters the light guide plate 3 to excite the fluorescent excitation material 31 to emit fluorescence, and the fluorescence and the excitatio...

Example Embodiment

[0023] Embodiment two:

[0024] In this embodiment, the light guide plate 3 can be further improved to atomize light. In this way, the light emitting surface of the light guide plate becomes a surface light source with uniform light intensity, which is beneficial to improve the uniformity of the brightness of the display panel. The light guide plate can specifically adopt the structure of the diffusion plate in the traditional backlight module. The difference from the traditional diffusion plate is that the light guide plate in this embodiment is a diffusion plate with uniformly distributed fluorescent excitation substances.

[0025] The light guide plate described in this embodiment not only solves the problem of poor consistency of the brightness and color coordinates of the LED light source in the traditional backlight module, but also has the function of diffusing light, which is beneficial to further increase the uniformity of the display panel.

Example Embodiment

[0026] Embodiment three:

[0027] figure 2 The schematic diagram of the structure of the direct type LED backlight module provided by the third embodiment of the present invention is shown. For ease of description, only the parts related to this embodiment are shown.

[0028] In this embodiment, a diffuser 5 can be added to the light exit surface of the light guide plate 3 to increase the uniformity of the backlight.

[0029] In this embodiment, a light-enhancing sheet 6 can be further provided on the light-emitting surface of the diffusion sheet 5 to provide a high-brightness uniform backlight for the display panel, such as figure 2 .

[0030] In this embodiment, when the light guide plate 3 has very superior light diffusion performance, it is also possible to add a light enhancement sheet 6 only on the light exit surface of the light guide plate.

[0031] In the present invention, the exposed LED chip is directly arranged on the printed circuit board, and then a light guide plate ...

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PUM

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Abstract

The invention is suitable for the field of liquid crystal display and provides a directly-lit LED backlight module. The backlight module comprises a printed circuit board, wherein the front side of the printed circuit board is provided with an LED chip electrically connected with the printed circuit board; and the light emergent direction of the LED chip is provided with a light guide board on which fluorescent excitation substances are uniformly distributed. In the invention, the bare LED chip is directly arranged on the printed circuit board, and then the light emergent direction of the LED chip is provided with the light guide board on which the fluorescent excitation substances are uniformly distributed, because the LED chip is not singly packaged, the problems of inconsistent color coordinates caused by non-uniform fluorescent powder dosage and non-uniform brightness caused by errors of glue dispensing positions are solved; meanwhile, the package cost is saved, the manufacturing procedure is simplified, the absorption to light by fluorescent glue is avoided and the light efficiency of the backlight module is improved.

Description

technical field [0001] The invention belongs to the field of liquid crystal displays, in particular to a direct-lit LED backlight module and a liquid crystal display. Background technique [0002] At present, there are mainly two types of backlights for liquid crystal displays: direct-lit and edge-lit. At present, the edge-lit type is the mainstream of LED backlight modules. In addition to the ultra-thin factor, in terms of system light efficiency and cost, edge-lit LED backlight modules also have obvious advantages over direct-lit LED backlight modules. On the other hand, direct-lit backlights are superior to edge-lit backlights in terms of brightness uniformity, contrast, and viewing angles. Therefore, the most important problem to be solved at present for the direct-lit LED backlight is to reduce the cost and improve the light efficiency of the system. From this point of view, chip-on-board is undoubtedly the most suitable solution. It directly mounts the exposed LED c...

Claims

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Application Information

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IPC IPC(8): F21S8/00F21V13/00F21V31/00G02F1/13357F21Y101/02F21Y105/00F21Y115/10
Inventor 陈珉谢飞
Owner SKYWORTH LCD SHENZHEN CO LTD
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