Lens sheet to be used in backlight, and backlight and display device using the lens sheet
一种显示装置、透镜片的技术，应用在透镜片领域，能够解决棱镜产生瑕疵、顶部易损伤、集聚等问题
Inactive Publication Date: 2009-01-14
HITACHT MAXELL LTD
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AI Technical Summary
Problems solved by technology
[0005] In addition, since the light of the side lobe cannot be gathered on the front, there is a limit to using a prism sheet to improve the brightness of the front.
In order to further improve the front brightness, two prism sheets must be superimposed on the surface light source, thus making the manufacturing process complicated
[0006] In addition, since the cross-section of the prism is triangular, it is easy to have flaws on the prism during manufacture, transportation, and laying on the backlight, especially the top is easily damaged.
Such imperfections tend to appear as bright and dark spots on the display
Method used
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Examples
Experimental program
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Embodiment 1
[0125] Lens sheets of Examples 1 to 6 of the present invention having shapes and refractive indices n21 to n24 shown in Table 1 were manufactured. In addition, a prism sheet was manufactured as a comparative example. The angular distribution of luminance of the lens sheets and prism sheets of Examples 1 to 6 of the present invention was investigated.
[0126] [Table 1]
[0127]
[0128] [Example 1 of the present invention]
[0129] made Figure 3 ~ Figure 5 The angular distribution of luminance was investigated for the lens sheet of Example 1 of the present invention and the prism sheet of Comparative Example having the shapes shown.
[0130] [Manufacturing method]
[0131] The lens sheet of Example 1 of the present invention was produced by the method shown below. A roll plate for prisms having a surface in which grooves for prism transfer are arranged in the circumferential direction was prepared. The cross-sectional shape of the groove for prism duplication is an i...
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Abstract
A lens sheet is provided with a base film, a reticular lens resin layer, a prism resin layer and a filling resin layer. The reticular lens resin layer is formed on one surface of the base film and is provided with a plurality of cylindrical lenses arranged in parallel. The prism resin layer is formed on the other surface of the base film, with a plurality of prisms arranged in parallel, and has a refraction factor lower than that of the base film.The filling resin layer is applied on the surface whereupon the prisms of the prism sheet resin layer are arranged in parallel, and has a refraction factor higher than that of the prism resin layer. Thus, the lens sheet can suppress side lobe light emitted in the front diagonal direction.
Description
technical field [0001] The present invention relates to a lens sheet, a backlight using the same, and a display device. More specifically, it relates to a lens sheet having a function of improving front brightness and used for a backlight, a backlight using the same, and a display device. Background technique [0002] Improvement of front luminance is required in a display device representing a liquid crystal display. For this reason, a lens sheet that collects light from a surface light source toward the front to increase the brightness of the front is laid on the backlight used for the display. As such a lens sheet, a prism sheet disclosed in Japanese Patent No. 3262230 is generally used. [0003] refer to Figure 18 and Figure 19 , the conventional prism sheet 100 includes a plurality of prism strips (hereinafter referred to simply as prisms) PL arranged side by side on the surface. The refractive index of the prism sheet 100 is about 1.5-1.6. The diffused light R10...
Claims
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IPC IPC(8): G02B5/00G02B5/04G02B3/00G02B3/06F21S2/00G02F1/13357F21Y103/00F21Y101/00G02F1/1335
CPCG02F1/133604G02F1/133611G02B5/045G02F1/133606G02B3/06G02B3/0025G02F2001/133607G02B3/005G02F1/133607G02B3/00G02B5/04G02F1/1335
Inventor 山田幸宪
Owner HITACHT MAXELL LTD