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Light guide plate, surface illuminating device, and liquid crystal display device

A technology of light guide plate and light exit surface, which is applied in the field of light guide plate to achieve the effect of thinning, narrowing interval and high utilization efficiency

Inactive Publication Date: 2012-10-03
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, for a direct type backlight unit, in order to make the light intensity distribution uniform, the thickness in the direction perpendicular to the liquid crystal display panel must be about 30 mm, and it is difficult to make the thickness thinner than 30 mm.

Method used

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  • Light guide plate, surface illuminating device, and liquid crystal display device
  • Light guide plate, surface illuminating device, and liquid crystal display device
  • Light guide plate, surface illuminating device, and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0192] The light guide plate 30 when the screen size corresponds to 42 is used as Example 1. Specifically, a light guide plate whose length from the first light incident surface 30c to the second light incident surface 30d is set to 545 mm and whose length from the light exit surface 30a to the back surface 30b at the bisector α is The length until the length, that is, the thickness D of the thinnest part is set as 2.56mm, the thickness of the first light incident surface 30c and the second light incident surface 30d, that is, the thickness of the thickest part is set as 3.0mm, and the thickness of the first light incident surface 30c and the second light incident surface 30d is set as 3.0mm. The length from the light exit surface 30a to the boundary surface z at the bisector α of the first layer 60, that is, the thickness D1 of the first layer 60 at the thinnest part of the first layer 60 is set to 2.12 mm, and the second The length from the boundary surface z to the rear sur...

example 2

[0213] As Example 2, the following light guide plate 80 is used. This light guide plate 80 is a light guide plate with the same shape as Example 1 and a screen size of 46, such as Figure 9 As shown, the boundary surface z between the first layer 60 and the second layer 62 is from the second layer 62 from the light exit surface 30a at the bisector α (that is, the central part of the light exit surface) to the first light incident surface. 30c and the second light incident surface 30d become thinner and change continuously, and in the vicinity of the first light incident surface 30c and the second light incident surface 30d, it becomes thicker again toward the light exit surface 30a side. change. At this time, the synthetic particle concentration is obtained using the reverse bias concentration, and the thicknesses (shape of the boundary surface z) of the first layer 60 and the second layer 62 are obtained from the obtained synthetic particle concentration.

[0214] That is, t...

example 3

[0226] As example 3, Figure 9 The light guide plate 80 shown is a light guide plate when the screen size is 32, and the curvature radius R of the concave and convex curved surfaces of the boundary surface z is changed y1 , R y2 , and the particle concentrations of the first layer 60 and the second layer 62 are measured.

[0227] Specifically, the following light guide plate is used as Example 3. The length of the light guide plate from the first light incident surface 30c to the second light incident surface is set to 413mm, and the first light incident surface 30c and the second light incident surface 30d The thickness, that is, the thickness D2 of the thickest part is set to 3mm, the amount of depression d is set to 0.5mm, the radius of curvature of the light exit surface 30a is set to 42500mm, and the thickness D3 of the second layer 62 in the first light incident surface The thickness D4 of the thinnest part of the second layer 62 was 0.5 mm, and the thickness D5 of the...

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Abstract

Disclosed is a light guide plate wherein the utilization efficiency of light is high, light with less luminance variation can be output, and a distribution such that the central part of the screen is brighter than the peripheral part can be achieved. The light guide plate comprises a rectangular light output surface, a light input surface through which light traveling in a direction approximately parallel to the light output surface is allowed to enter, a back surface on opposite side to the light output surface, and scattering particles dispersed inside. The light guide plate is so configured that the light guide plate has two or more layers which are stacked in a direction approximately perpendicular to the light output surface and which have particle densities of the scattering particles different from one another, the layers include a first layer which is on the light output surface side and the particle density of which is Npo and a second layer which is nearer to the back surface than the first layer and the particle density of which is Npr, the relation Npo<Npr is satisfied, the shape of the cross section taken in a direction perpendicular to the light input surface on the light output surface side is concave, the thicknesses of the first and second layers in a direction approximately perpendicular to the light output surfaces are varied from each other, and thereby the combined particle density of the light guide plate in a direction perpendicular to the light input surface is varied.

Description

technical field [0001] The present invention relates to a light guide plate used in liquid crystal display devices and the like. Background technique [0002] A liquid crystal display device uses a backlight unit that emits light from the back side of a liquid crystal display panel (panel) to illuminate the liquid crystal display panel. The backlight unit is composed of components such as a light guide plate, a prism sheet for uniforming the light emitted from the light guide plate, or a diffusion sheet. Irradiate. [0003] Currently, a so-called direct-type method in which a light guide plate is arranged directly above a light source for illumination is the mainstream method for a backlight unit of a large liquid crystal television. In this method, a plurality of cold-cathode tubes as light sources are arranged on the back of the liquid crystal display panel, and the interior is set as a white reflective surface to ensure uniform light distribution and necessary brightnes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21S2/00G02B6/00G02F1/1335G02F1/13357F21Y101/02
CPCG02B6/0046G02B6/0041G02B6/005G02B6/0076
Inventor 岩崎修
Owner FUJIFILM CORP
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