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Backlight unit and liquid crystal display

A technology of backlight unit and light-emitting element, applied in optical elements, lighting devices, optics, etc., can solve the problems of uneven brightness and reduced image quality, and achieve the effect of suppressing uneven brightness

Inactive Publication Date: 2010-03-24
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] And, when such a dark region br and a bright region lr are generated in the light guide plate 121, it will thus cause brightness to be generated in the light (backlight) from the backlight unit 172 uneven
And, when the backlight that produces the uneven brightness enters the liquid crystal display panel, the influence of uneven brightness occurs on the display image of the liquid crystal display panel, resulting in a decrease in the image quality of the liquid crystal display device.

Method used

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  • Backlight unit and liquid crystal display
  • Backlight unit and liquid crystal display
  • Backlight unit and liquid crystal display

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0068] An embodiment will be described below with reference to the drawings. In addition, depending on the drawings, part numbers and the like may be omitted for convenience, and in such cases, other drawings may be referred to. In addition, black dots on the drawings indicate directions perpendicular to the paper surface.

[0069] Figure 29 It is an exploded perspective view of the liquid crystal display device 79 . As shown in the figure, a liquid crystal display device 79 includes a liquid crystal display panel 71 and a backlight unit 72 .

[0070] The liquid crystal display panel 71 is a non-luminous display panel, and performs a display function by receiving light (backlight) from a backlight unit 72 . Therefore, if the light from the backlight unit 72 can uniformly illuminate the entire surface of the liquid crystal display panel 71, the display quality of the liquid crystal display panel 71 will be improved.

[0071] The backlight unit 72 includes an LED (Light Emi...

Embodiment approach 2

[0090] Embodiment 2 will be described. In addition, components having the same functions as those used in Embodiment 1 are denoted by the same symbols, and description thereof will be omitted.

[0091] In Embodiment 1, it was exemplified that one LED 11 in the LED row 12b of the two LED rows 12a, 12b illuminates the backlight unit 72 between the LEDs 11, 11 in the LED row 12a. However, it is not limited to this.

[0092] For example, if Figure 6 ~ Figure 10 (also, Figure 6 ~ Figure 10 description with Figure 1 to Figure 5 same), the two LEDs 11, 11 in the LED row 12b may illuminate the backlight unit 72 between the LEDs 11, 11 in the LED row 12a.

[0093] Specifically, the interval La2 of the arrangement pitch of the LEDs 11 in the LED row 12a is different from the interval Lb2 of the arrangement pitch of the LEDs 11 in the LED row 12b (La2>Lb2), and the first optical path BLa of the LEDs 11 in the LED row 12a The second light path BLb of the LEDs 11 in the LED row 12b...

Embodiment approach 3

[0097] Embodiment 3 will be described. In addition, components having the same functions as those used in Embodiment 1 are denoted by the same symbols, and description thereof will be omitted.

[0098] In the backlight unit 72 according to Embodiments 1 and 2, the LED group GP is mounted on the FPC board 31 facing only the bottom surface 21 a (non-light-emitting surface 21 a ) of the light guide plate 21 . However, it is not limited to this. For example, if Figure 11 ~ Figure 16 As shown, the LEDs 11 of the LED group GP may be dispersedly mounted on the FPC boards 31 a and 31 b facing the bottom surface 21 a and the top surface 21 b (light exit surface 21 b ) of the light guide plate 21 .

[0099] Next, the LEDs of the LED group GP are respectively mounted on the FPC board (non-light-emitting surface side FPC board) 31a facing the bottom surface 21a of the light guide plate 21 and the FPC board (light-emitting surface side FPC board) 31b facing the top surface 21b. Backlig...

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Abstract

A plurality of LEDs (11) in an LED group (GP) are arranged in parallel in a longitudinal direction of an incident face (21s) on an optical waveguide (21) to form LED rows (12a and 12b). Those two LEDrows (12a and 12b) are placed in parallel in the direction intersecting with the incident face (21s).

Description

technical field [0001] The present invention relates to a backlight unit for irradiating light to a liquid crystal display panel, and a liquid crystal display device including the backlight unit. Background technique [0002] Generally, in a display panel (liquid crystal display panel) using liquid crystals, the liquid crystals themselves do not emit light by themselves. Therefore, a liquid crystal display device including a liquid crystal display panel takes in sunlight or the like as external light, and displays various images on the liquid crystal display panel using the external light. Therefore, when it is assumed that the liquid crystal display device cannot take in external light, it is desirable to have an irradiation device (backlight unit) for irradiating liquid crystal. [0003] can cite Figure 30 ~ Figure 32 The backlight unit 172 is shown as an example (in addition, Figure 31 from the back Figure 30 A plan view of the LED 111 (refer to arrow b), Figure 3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21V8/00F21Y101/02G02F1/13357
CPCG02B6/0068G02B6/0073G02B6/0091
Inventor 大山千晶三轮将司
Owner SHARP KK
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