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Backlight module for flat display device

A flat display and backlight module technology, applied in optics, nonlinear optics, instruments, etc., can solve problems such as laborious, insurmountable bright bands, and time-consuming

Inactive Publication Date: 2007-07-18
合肥福映光电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the LED light source 12 directly guides the light source toward the side of the light guide plate 14 without special design, an insurmountable bright band is likely to appear at or near the interface where the light source 12 enters the light guide plate 14
In addition, the structural parameters of the general light guide plate can only be designed for a single-size panel, and light guide plates of different sizes must have different structural parameter designs
Therefore, every time the size of the liquid crystal display panel is increased, the light guide plate needs to be redesigned, which is time-consuming and laborious.

Method used

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  • Backlight module for flat display device
  • Backlight module for flat display device
  • Backlight module for flat display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Please refer to FIG. 2 a , which is a three-dimensional schematic diagram of a preferred embodiment of the backlight module of the present invention. In FIG. 2 a , the light guide plate 22 is a square plate, one side of the light guide plate 22 is adjacent to a columnar optical element 24 , and a plurality of light emitting diodes 26 are disposed on the bottom surface 241 of the columnar optical element 24 . Thus, the light emitted by the LED 26 can be guided into the light guide plate 22 through the columnar optical element 24 .

[0035] Please refer to FIG. 2b, which is a cross-sectional view of the cylindrical optical element 24 in FIG. 2a. As shown in FIG. 2b, the cylindrical optical element 24 includes a total reflection surface 242, a bottom surface 241, a first side 243 and a second side 2440. The first side 243 of the cylindrical optical element 24 is connected to the side of the light guide plate 22, The total reflection surface 242 and the bottom surface 241 ...

Embodiment 2

[0039] Please refer to FIG. 3 a , which is a three-dimensional schematic diagram of another preferred embodiment of the backlight module of the present invention. This embodiment is the same as the first embodiment except that the structure of the cylindrical optical element 24 is different from the first embodiment.

[0040] FIG. 3b is a cross-sectional view of the cylindrical optical element 24 of FIG. 3a. In FIG. 3 b , the cylindrical optical element 24 includes a total reflection surface 242 , a bottom surface 241 , a first side surface 243 and a second side surface 244 . The first side 243 of the columnar optical element 24 is connected to the side of the light guide plate 22, and its height (D) is 4.666 mm; the total reflection surface 242 is connected to the first side 243, and its radius of curvature (R) is 10 mm; the second side 244 is connected to the total reflection surface 242, and this second side 244 is a quarter circular surface, and its radius of curvature (r...

Embodiment 3

[0043]Please refer to FIG. 4a, which is a cross-sectional view of another preferred embodiment of the backlight module of the present invention. In this embodiment, the backlight module of the first embodiment is regarded as a block, and then the length axis and the width axis are doubled respectively. Therefore, the length and width of the light guide plate 52 in this embodiment are both twice that of the light guide plate 22 in the first embodiment.

[0044] This embodiment includes two columnar optical elements 54 , 56 , one columnar optical element 54 is adjacent to one side of the light guide plate 52 , and the other columnar optical element 56 is accommodated in the groove 62 of the light guide plate 52 . The structures of the two cylindrical optical elements 54 and 56 are identical to the cylindrical optical element 24 in the first embodiment except that the length is doubled.

[0045] Please refer to FIG. 4b, which is a partially enlarged view of FIG. 4a. In FIG. 4 b...

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Abstract

A backlight module used on flat display device is prepared as arranging a groove on light guide plate, setting a cylindrical optical element with a full reflection surface and a base surface as well as the first side surface in said groove, and setting multiple light source at base surface of said cylindrical optical element for obtaining optimum light-outgoing effect.

Description

technical field [0001] The invention relates to a backlight module, especially a backlight module suitable for a liquid crystal display device. Background technique [0002] Some flat-panel displays that do not emit light themselves require additional light sources to provide sufficient light for display purposes, and are generally used in combination with optical modules. [0003] For example, a liquid crystal display device usually uses a backlight module including a light source to provide a uniform surface light source for display. Generally, a backlight module used in combination with a liquid crystal display panel mostly includes a combination of a light source and a light guide plate. [0004] At present, the light source used in the backlight module is mostly cold cathode fluorescent tube (Cold Cathode Fluorescent Lamp; CCFL) or light emitting diode (Light Emitting Diode; LED). The cold cathode fluorescent tube is limited in its application range because of its sho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13357G02F1/1335
Inventor 郭明哲蔡五湖林宏裕张荣监
Owner 合肥福映光电有限公司
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