Surface light source device and display apparatus

a light source device and surface technology, applied in lighting and heating devices, planar/plate-like light guides, instruments, etc., can solve the problems of limited options and the tendency to widen the actual viewing angle greater than the desired rang

Inactive Publication Date: 2008-09-04
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides a way for users to choose between different ways they can see at different times while still being able to protect their personal data. This makes it easier for them to access private data without compromising their security.

Problems solved by technology

The technical problem addressed in this patent is how to improve LCD displays' ability to protect image details while still allowing users to see them without revealing themselves.

Method used

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  • Surface light source device and display apparatus
  • Surface light source device and display apparatus
  • Surface light source device and display apparatus

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first preferred embodiment

[0022]The following description is given on the assumption that display apparatuses according to the invention are liquid crystal display apparatuses. FIG. 1 is an exploded perspective view showing an example of the outline configuration of a liquid crystal display apparatus of the present preferred embodiment. As shown in the figure, the liquid crystal display apparatus of the present preferred embodiment includes a surface light source device 1, a liquid crystal panel 2, gate drivers 3, and source drivers 4.

[0023]The surface light source device 1 has a main surface from which light is emitted. In the present preferred embodiment, light from the main surface of this surface light source device 1 illuminates the liquid crystal panel 2 through an opening 5. The surface light source device 1 is placed on the back surface side of the liquid crystal panel 2 and irradiates the back surface side of the liquid crystal panel 2 with light. The liquid crystal panel 2 as a display device is provi

second preferred embodiment

[0065]FIG. 11 is a plan view showing an example of the essential configuration of the surface light source device 1 according to another preferred embodiment of the invention. This figure corresponds to FIG. 3 of the first preferred embodiment. Hereinafter, the components similar to those described in the first preferred embodiment are designated by the same reference numerals or characters.

[0066]As in the first preferred embodiment, an optical film is provided on the exit surface side of the light guide plates 8. In the present preferred embodiment, the optical film further includes a diffusion film 20 that is alternately arranged with the light-shield slit film 10 and that diffuses light emitted from the light guide plates 8.

[0067]As shown in FIG. 11, in the present preferred embodiment, the light-shield slit film 10 is provided along the light guide plates 8A, and the diffusion films 20 is provided along the light guide plates 8B. A certain range of angles of the light-shield slit f

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PUM

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Abstract

A liquid crystal display apparatus is provided which has two or more options in selection of the range of viewing angles. A surface light source device according to the invention has a main surface from which light is emitted, and includes a plurality of light guide plates corresponding to a plurality of regions obtained by dividing the main surface in parallel; an optical film provided on the exit surface side of the light guide plates; and a light driver that controls the turning on and off of the plurality of light guide plates. The optical film includes a light-guide slit film which transmits light that is emitted from the light guide plates and that is within a certain range of angles.

Description

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Claims

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Application Information

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Owner MITSUBISHI ELECTRIC CORP
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