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Backlight unit and liquid crystal display device

A liquid crystal display device and a liquid crystal display panel technology, which is applied in the field of liquid crystal display devices, can solve the problems that light does not reach, light cannot fully reach a light guide plate, etc., and achieves the effect of uneven light quantity, simple and cheap

Inactive Publication Date: 2011-12-14
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, light cannot sufficiently reach the entire area of ​​the light guide plate 121 with only one LED 111, and a region (dark region; see the oblique lines in the figure) where light does not reach occurs in a wide range.

Method used

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

Examples

Experimental program
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Embodiment approach 1

[0055] An embodiment will be described below with reference to the drawings. In addition, for the sake of convenience, members themselves, member reference numerals, etc. may be omitted, and in such cases, other drawings can be referred to. On the contrary, hatching is sometimes attached even if it is not a cross-sectional view for convenience. In addition, black dots on the drawings indicate directions perpendicular to the paper surface.

[0056] Figure 17 The exploded perspective view of shows the liquid crystal display device 69. as it should Figure 17 As shown, the liquid crystal display device 69 includes a liquid crystal display panel 59, a backlight unit 49, and a bezel BZ (front bezel BZ1, back bezel BZ2) holding them through the liquid crystal display panel 59 and the backlight unit 49.

[0057] In addition, the shape of the outer frame (frame) BZ is not particularly limited. For example, if Figure 17 As shown, the back bezel BZ2 can be a casing for accommoda...

Embodiment approach 2

[0090] Embodiment 2 will be described. In addition, members having the same functions as those used in Embodiment 1 are given the same reference numerals and their descriptions are omitted.

[0091] In Embodiment 1, the single-sided light-receiving surface RS was given as an example, but it is not limited thereto. For example, if Figure 6 As shown in the plan view of , one recess DH that is recessed toward the forward direction of light from the LED 11 can be formed on one light receiving surface RS. For example, a plurality of small surfaces SS ( SS1 to SS3 ) may be connected by forming an angle (included angle α) of less than 180° between the small surfaces SS, thereby forming a front direction of light from the LED 11 on the light receiving surface RS. Recessed recessed DH.

[0092] With such a configuration, the inner surface of the recess DH (and further, the light receiving surface RS) becomes a polygonal surface in which a plurality of small surfaces SS are arranged...

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Abstract

In the backlight unit (49), the light receiving surface (RS) formed on a part of the side surface (21S) of the light guide plate (21) and facing the light emitting surface (11L) of the LED (11) is located at the corner of the light guide plate (21) (21C), and the position of the corner (21C) is the position of at least two adjacent corners (21C) in the light guide plate (21).

Description

technical field [0001] The present invention relates to a backlight unit (illumination device) that emits light and a liquid crystal display device using light from the backlight unit. Background technique [0002] Recently, in backlight units mounted on liquid crystal display devices, the number of LEDs serving as light-emitting elements has been reduced in order to achieve cost reduction. For example, if Figure 18A As shown in the plan view of , one LED 111 is arranged at one corner 121C of the light guide plate 121 . In this way, the light diffused from the LEDs 111 efficiently reaches the entire light guide plate 121 , and even if a small number of LEDs 111 pass through, the inside of the light guide plate 121 can be brightened in a wide range. [0003] However, light cannot sufficiently reach the entire area of ​​the light guide plate 121 with only one LED 111 , and a region (dark region; see the oblique lines in the figure) where light does not reach occurs in a wide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21S2/00G02F1/13357F21Y101/02
CPCG02F1/133615G02B6/0083G02B6/002
Inventor 滨田哲也
Owner SHARP KK
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