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Light guide plate and method of manufacturing light guide plate, surface light source apparatus and transmission type image display apparatus

A manufacturing method and technology of light guide plates, applied in the field of light guide plates, can solve problems such as uneven gray scale of smog, large difference between light and shade in printing area and non-printing area, etc.

Inactive Publication Date: 2013-05-08
SUMITOMO CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, when the light reflection dots are printed such that the coverage near the light incident portion where the light from the light source enters is lower, since the light reflection dots are small, the difference between the light and shade of the printed area and the non-printed area is large. Grayscale unevenness like haze occurs near the light incident part

Method used

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  • Light guide plate and method of manufacturing light guide plate, surface light source apparatus and transmission type image display apparatus
  • Light guide plate and method of manufacturing light guide plate, surface light source apparatus and transmission type image display apparatus
  • Light guide plate and method of manufacturing light guide plate, surface light source apparatus and transmission type image display apparatus

Examples

Experimental program
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Effect test

Embodiment 1）

[0152] A PMMA resin sheet of 923 mm×540 mm was prepared as a translucent resin sheet, and a light guide plate was produced using an ultraviolet curable inkjet ink containing calcium carbonate as a pigment.

[0153] Specifically, according to Figure 5 As shown in the flowchart, the light distribution pattern is designed. In the coverage ratio setting step S11 , the back surface S2 was divided into a plurality of dummy regions A having a 507 μm square, and the coverage ratio of each dummy region A was set to 3.4%. Then, in the grid setting step S12 , 6×6 dummy grids g serving as printing targets of the light reflection dots 12 are set per dummy area A. FIG. In this process, 36 virtual grids g are regularly arranged two-dimensionally. In the virtual area A, the number ( L1 ) of virtual grids g in the first direction x is six, and in the virtual area A, the number ( L2 ) of virtual grids g in the second direction y is also six. Then, in the light reflection point condition set...

Embodiment 2～5）

[0159] The light guide plates of Examples 2 to 5 were obtained in the same manner as in Example 1 except that the arrangement of the light reflection points 12 in the dummy area A was changed.

[0160] Figure 8 (a)~ Figure 8 (d) is a drawing which shows the arrangement|positioning of the light reflection point 12 in the virtual area A in Examples 2-5, respectively. Differences between Embodiments 2 to 5 from Embodiment 1 will be described using the concept of the small area B. FIG. exist Figure 8 (a)~ Figure 8 (d), in order to represent the size of the small area B, with Figure 4 In the same case, a small area B is marked with oblique lines. In the other drawings, a small area B is also marked with oblique lines.

[0161] In Embodiment 2, the configuration of the light reflection points 12 in the small area B is as follows Figure 8 It is changed as shown in (a). In Example 2, the light reflection points 12 are arranged for all the small areas B in the virtual are...

Embodiment 6）

[0168] In Example 6, the coverage rate was changed to 1.9%, and the number (n) of light reflection points 12 in the virtual area A was changed to five. As the number (n) of light reflection points 12 changes, the configuration of light reflection points 12 in the virtual area A is as follows: Figure 9 It is changed as shown in (a). Figure 9 (a) is a figure which shows the arrangement|positioning of the light reflection point 12 in the virtual area A in Example 6. FIG. In Example 6, the number (n) of light reflection points 12 in the virtual area A is 5, and L1 and L2 are 6 as in Example 1, so N1e min with N2e min The combination of is (2, 3) or (3, 2). In Example 6, it is assumed that N1e min = 2, N2e min =3. Therefore, when the concept of small area B is introduced in the same manner as in Example 1, the number (M1) of virtual grids g in the first direction x constituting the small area B in Example 6 is three, and the number of virtual grids g in the second direction...

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Abstract

Provided are designed methods of a light guide plate, a surface light source apparatus and a transmission type display apparatus and a method of manufacturing the light guide plate, which can recues grey unevenness generated nearby a light incoming portion of an incoming light. The light guide plate includes a light guide plate substrate (11) which transmits light, and multiple light reflection points (12) which formed on at least one surface of the light guide plate substrate. In multiple virtual areas formed by virtually segmenting a surface where the light reflection points, that is the point formation surface (S2) at equal intervals, multiple virtual grids (g) are regularly and two-dimensionally arranged, wherein light reflection points are formed in specific virtual grids in the multiple virtual grids; light distribution patterns that are symmetrically translated are formed according to configuration of the light reflection points in one virtual area of the multiple virtual areas and the configuration of the light refection points in at least one virtual area of the remaining multiple virtual areas, and multiple light reflection points are formed on the point formation surface.

Description

technical field [0001] The present invention relates to a light guide plate, a surface light source device, a transmissive image display device, a method for designing a light distribution pattern for a light guide plate, and a method for manufacturing a light guide plate. Background technique [0002] A transmissive image display device such as a liquid crystal display device generally has a surface light source device that supplies planar light using a light guide plate as a backlight. The type of surface light source device includes a direct type in which the light source is installed on the back side of the light guide plate and an edge lighting type in which the light source is installed along the side of the light guide plate. The edge lighting method is advantageous from the viewpoint of thinning the image display device. [0003] In the surface light source device of the edge lighting method, the light incident from the side of the light guide plate is reflected and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/00F21S8/00F21V8/00G02F1/13357F21Y101/02
CPCG02B6/0031G02B6/0043G02B6/0061G02B6/0065G02F1/133611G02F1/133615
Inventor 百田健太郎关口泰广岛田芳永
Owner SUMITOMO CHEM CO LTD
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