Illumination device and display device

A technology for lighting devices and display surfaces, which is applied to light guides, instruments, light guides, etc. The effect of image quality and uniform brightness

Inactive Publication Date: 2016-05-04
SAKAI DISPLAY PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, light tends to exit unevenly from the front surface of the light guide plate
Therefore, the illumination of the backlight unit becomes uneven, and in turn, the brightness of the display surface of the liquid crystal display panel becomes uneven.

Method used

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  • Illumination device and display device
  • Illumination device and display device
  • Illumination device and display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0044] figure 1 as well as figure 2 It is a vertical cross-sectional view schematically showing the structure of the display device 1 according to Embodiment 1 of the present invention. exist figure 1 as well as figure 2 In the figure, the vicinity of the lower side of the reflective sheet 23 to be described later is shown. And, in figure 1 shows the left or right end of the reflection sheet 23, in figure 2 The center part in the left-right direction of the reflective sheet 23 is shown in .

[0045] image 3 It is a front view schematically showing the positional relationship between the reflection sheet 23 and the light source unit 24 included in the backlight unit 12 which is the lighting device according to Embodiment 1 of the present invention.

[0046] The display device 1 of the present embodiment is configured as, for example, a television receiver, an electronic signboard, or a monitor for a personal computer.

[0047] First, the configuration of the display...

Embodiment approach 2

[0098] Figure 5 It is a front view schematically showing the positional relationship between the reflection sheet 23 and the light source unit 24 included in the backlight unit 12 according to Embodiment 2 of the present invention. Figure 5 with Embodiment 1 image 3 correspond.

[0099] The backlight unit 12 of the present embodiment has substantially the same configuration as the backlight unit 12 of the first embodiment. Hereinafter, differences from Embodiment 1 will be described, and other parts corresponding to Embodiment 1 will be given the same reference numerals and descriptions will be omitted.

[0100] Generally, less important video is displayed on the left and right ends of the display surface 111 of the display panel 11 than in the center of the display surface 111 in the left and right direction of the display panel 11 . Therefore, the user sometimes desires that the display surface 111 be uniformly bright in the range where an important video is displayed ...

Embodiment approach 3

[0106] Image 6 It is a front view schematically showing the positional relationship between the reflection sheet 23 and the light source unit 24 included in the backlight unit 12 according to Embodiment 3 of the present invention. Image 6 with embodiment 2 Figure 5 correspond.

[0107] The backlight unit 12 of the present embodiment has substantially the same configuration as the backlight unit 12 of the second embodiment. Hereinafter, differences from Embodiment 2 will be described, and other parts corresponding to Embodiment 2 will be given the same reference numerals and descriptions will be omitted.

[0108] In Embodiment 2, the protrusions 232, 232 are disposed at positions W / 9 away from the left and right ends of the reflection sheet 23, but in this embodiment, the protrusions 232, 232 are disposed at a distance W / 9 from the reflection sheet 23. The left and right ends of the W / 4 position.

[0109] When such a reflective sheet 23 is used, in terms of surface emiss...

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PUM

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Abstract

Provided are an illumination device and a display device which can illuminate evenly. The brightness of a light source unit (24) is stronger in a peripheral edge direction (the left-right direction in the drawing) center portion of a light guide plate (22) than both peripheral edge direction end parts thereof. Therefore, in relation to the separation between the light source unit (24) and the lower end of a reflective sheet (23), the separation between the peripheral edge direction center portion of the light source unit (24) and the peripheral edge direction center portion (i.e., a recess (231)) in the lower end of the reflective sheet (23) is set to be the greatest. As a result, in accordance with portions at which the volume of direct light that falls inside of the light guide plate (22) from the light source unit (24) is small (or large), the volume of reflected light that falls inside of the light guide plate (22) from the reflective sheet (23) becomes large (or small). Consequently, the total amount of light incident inside the light guide plate (22) becomes uniform in the peripheral direction, and thus illumination from the illumination device can be made uniform in the peripheral direction.

Description

technical field [0001] The present invention relates to an illuminating device and a display device in which light emitted from a light source unit is emitted from one surface of a light guide plate. Background technique [0002] A liquid crystal display device includes a liquid crystal display panel having a display surface on the front side of the liquid crystal display panel, and a backlight unit that illuminates the liquid crystal display panel from the rear side of the liquid crystal display panel. [0003] Hereinafter, a case where a liquid crystal display panel is arranged in a vertical orientation will be described. [0004] Conventionally, an edge light type backlight unit has been proposed (see Patent Document 1). As for the edge light type backlight unit, a rectangular light guide plate is arranged on the rear surface side of the liquid crystal display panel with an optical sheet group interposed therebetween, and a reflection sheet is arranged on the rear surfac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/00G02F1/13357
CPCG02B6/0031G02B6/0055G02B6/0068G02B6/0073G02B6/002G02B6/0061
Inventor 山川亮
Owner SAKAI DISPLAY PROD
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