JP2006251623A - Optical diffusion plate and display apparatus using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical diffusion plate in which scattering of light by incidence of sunlight in outdoor installation is alleviated and contrast around the optical diffusion plate is improved in a display apparatus equipped with the optical diffusion plate in which light of a plurality of light emitting diodes (LEDs) is displayed like a continuous straight or curved line. <P>SOLUTION: The optical diffusion plate 20 is a shape of one edge opened rectangle and an edge section 22 of a cross sectional face is painted by, for example, a blackish light shielding color. Thereby, as external light such as the sunlight is absorbed at the edge section 22 after the incidence, the scattering of light is alleviated at the edge section 22. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a light diffusing plate that diffuses light from an LED light emitting element and a display device using the same.

  2. Description of the Related Art Conventionally, there are display devices in which a plurality of LED light emitting elements are arranged in a matrix and characters and figures are displayed by blinking of the individual LED light emitting elements.

  In recent years, a display device has come out in which a plurality of LED light emitting elements are arranged in a line so as to surround the periphery of the display unit, and a diffusion plate is arranged on the upper part to attract the attention of a person.

  FIG. 3 shows such a display device. The display device 1 includes a display unit 3 in which a plurality of LED light emitting elements are arranged in a matrix to display characters and figures, and a display unit 3 around the display unit 3. The decorative portion 2 is arranged, and the configuration of the decorative portion 2 is as shown in the cross-sectional view of FIG. 5 (a), with the light diffusing plate 5 having a concave and convex surface as shown in the perspective view of FIG. In addition, the plurality of LED light emitting elements 10 mounted on the substrate 12 at a desired interval are disposed on the upper surface.

With the above configuration, even if the number of LEDs is small, the point emission light from the LED light emitting element 10 appears as linear light due to the diffusion effect (for example, Patent Document 1).
JP 2003-280534 A

  However, in the conventional light diffusing plate 5 described above, as shown in the cross-sectional view of FIG. 5B (cross-sectional view seen from the direction of arrow A in FIG. 5A), the outside light such as daytime sunlight is used. 15 enters and scatters at the end of the light diffusing plate 5, so the periphery of the light diffusing plate 5 is white and the blur contrast is deteriorated, and the light from the LED light emitting element 10 is also scattered from the end, so that the decorative portion 2 There is a problem that it is difficult to see the display unit 3 in the vicinity.

  An object of this invention is to provide the light diffusing plate which can reduce the light scattered from the edge part of a light diffusing plate in view of the said subject.

  It is another object of the present invention to provide a display device that can improve the visibility of display contents close to the decorative portion by using the light diffusing plate as a decorative portion.

  In order to achieve the above object, the invention according to claim 1 is a light diffusing plate that diffuses light from an LED light emitting element, and an end portion of the light diffusing plate is a light diffusing plate having a light shielding color. .

  According to such a configuration, even if external light such as sunlight is incident, light is absorbed at the end portion, so that it is possible to prevent light from being scattered around the diffusion plate.

  The invention according to claim 2 is a light diffusing plate that diffuses light from the LED light emitting element, and is a light diffusing plate in which a light shielding plate is bonded to an end of the light diffusing plate.

  According to such a configuration, the same effect as that of the invention of claim 1 can be obtained, and the light scattered around the light diffusion plate can be absorbed and the contrast can be improved by setting the light shielding plate to a desired size. .

  A third aspect of the present invention is a display device comprising the light diffusing plate according to the first or second aspect.

  According to such a configuration, since there is no scattering of light due to external light, it is easy to see the display content of the display unit close to the decoration unit.

  According to the light diffusing plate of claim 1 of the present invention, by coating the end portion of the light diffusing plate with a light-shielding color, it is possible to reduce the scattering of external light incident on the light diffusing plate at the end portion. Can do.

  Further, according to the light diffusing plate according to claim 2, by adhering the end portion of the light diffusing plate and the light shielding plate, it is possible to reduce the scattering of the external light incident on the light diffusing plate at the end portion. In addition, the light scattered around the light diffusion plate can be absorbed to improve the contrast.

  According to the display device of claim 3, the contrast of the decorative portion is improved because there is no scattering of light by outside light or the LED light emitting element disposed inside the light diffusion plate, and the display close to the decorative portion is displayed. The display content of the part is also easy to see.

  Embodiments of the present invention will be described below with reference to the drawings.

  In the description of the drawings, the same components as those in the prior art are denoted by the same reference numerals and description thereof is omitted.

(Embodiment 1)
FIG. 1 is a cross-sectional view of a light diffusing plate showing a first embodiment of the present invention. The light diffusing plate 20 has a substantially cono-shaped shape, and an end 22 serving as a cut surface is made of, for example, black It is painted with shading color.

  According to such a configuration, external light such as sunlight strays inside the light diffusing plate after being incident, but is absorbed at the end 22, so that scattering at the end 22 can be reduced. it can.

  Similarly, the light from the LED light emitting element disposed inside the light diffusing plate 20 can be reduced from being scattered from the end portion.

  Although a good effect can be obtained by the above-described configuration, it is preferable that the coating is performed not only on the cut surface of the end portion 22 but also on the side portion, thereby further improving the light shielding effect. Can be increased.

  In addition, you may form not only the said structure but by shape | molding an edge part with resin of light-shielding color, and the same effect can be acquired.

  In addition, by using the diffuser plate 20 as a decorative part of the display device, the contrast of the decorative part is improved because there is no scattering of light by outside light or the LED light emitting element disposed inside the light diffuser, and the decorative part is improved. It becomes easy to see the display contents of the adjacent display units.

(Embodiment 2)
FIG. 2 is a cross-sectional view of an essential part of a display device showing a second embodiment of the present invention. The light diffusion plate 30 has a substantially cono-shaped shape, and a light shielding plate 32 is bonded to the end. .

  According to such a configuration, external light such as sunlight strays inside the light diffusing plate 30 after being incident, but light emitted from the end (not shown) is absorbed by the light shielding plate 32. Therefore, it is possible to reduce the scattering at the end portion, and the scattered light around the light diffusion plate 30 is also absorbed, so that the contrast of the decorative portion can be improved.

  As described above, the present invention is a useful technique for improving the contrast of a light diffusing plate used in a display device or the like installed in a place that is easily affected by external light.

Sectional drawing of the light diffusing plate which is the 1st Embodiment of this invention Sectional drawing of the principal part of the display apparatus which is the 2nd Embodiment of this invention. External view of conventional display device A perspective view of a conventional light diffusion plate (A) is principal part sectional drawing of the decoration part of the conventional display apparatus, (b) is principal part sectional drawing seen from the arrow A direction of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Display apparatus 2 Decoration part 3 Display part

Claims (3)

A light diffusing plate for diffusing light from an LED light emitting element, wherein an end portion of the light diffusing plate has a light shielding color. A light diffusing plate for diffusing light from an LED light emitting element, wherein a light shielding plate is bonded to an end of the light diffusing plate. A display device comprising the light diffusing plate according to claim 1.

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