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Light guide plate, manufacturing method thereof, surface light source device, and transmissive image display device

A manufacturing method and a technology for a light guide plate, which are applied in the field of light guide plates, and can solve the problems of a large difference in light and shade between a printing area and a non-printing area, and uneven grayscale of smoke haze.

Inactive Publication Date: 2015-09-16
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, manufacturing method thereof, surface light source device, and transmissive image display device
  • Light guide plate, manufacturing method thereof, surface light source device, and transmissive image display device
  • Light guide plate, manufacturing method thereof, surface light source device, and transmissive image display device

Examples

Experimental program
Comparison scheme
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

PURPOSE: A manufacturing method of light guide plates is provided to reduce the brightness smudge placing around a light incoming unit in which the light is incoming. CONSTITUTION: A light guide plate member(11) has four sides(S31-S34) intersecting in an exit side(S1), a rear side(S2) of an opposite side of the exit side, and the exit side and the rear side. The four sides S31~S34 are figured by orthogonally crossing the exit side and the rear side. In the rear side of the light guide plate member a plurality of light reflection dot(12) is formed. In order to exit the light of a uniform plane shape from the exit side efficiently, the light reflection dot is small in an incoming light unit side close to a light source(3) and gets bigger as the light reflection dot goes further from the light source. The light reflection dot is formed in a virtual grid regularly arranged in two dimension through a front side of the rear side.

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 Patents(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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