JP2015022093A - Display plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display plate that enables a new aesthetic performance of a display pattern such as a character, and enables calling for attention.SOLUTION: A light guide plate 1 has: an incident surface Son a side surface; an emission surface Son a surface; and a light distribution control surface Son a rear surface. On the incident surface Sof the light guide plate 1, a visible light source 2 for background mode is provided, and a diffusion layer 3 is provided on the emission surface S. On the diffusion layer 3, a transparent plate 6 is provided, and in the transparent plate 6, an ink layer 7 of a first display patter is printed. By forming a photochromic layer 8 patternized on the transparent plate 6, a second display pattern is formed. The first display pattern is visually recognized by the visible light source 2 for background mode, and remains unchanged. The photochromic layer 8 is colored by un ultraviolet ray from an ultraviolet light source 9, and is decolored by visible light from the visible light source 2. Thus, the second display pattern changes by the ultraviolet light source 9, for example, blinks to be visually recognized.

Description

  The present invention relates to a display plate using a light guide plate.

  A display board using a side-edge type light guide plate as a display board used as a signboard for public facilities or as a signboard is advantageous in terms of energy saving, low cost, thin film formation, large area, etc. because there are few light sources ( Reference: Patent Document 1).

  3A and 3B show a conventional display panel, in which FIG. 3A is a front view and FIG. 3B is a cross-sectional view taken along line BB in FIG.

In FIG. 3, the light guide plate 1 has an incident surface S _in on the side surface, an output surface S _out on the front surface, and a light distribution control surface S _cont on the back surface. A plurality of visible light sources 2 made of light emitting diodes (LEDs) are provided on the incident surface S _in of the light guide plate 1, a diffusion layer 3 is provided on the output surface S _out, and light distribution is provided on the light distribution control surface S _cont. A reflection layer 4 is provided for diffusing and reflecting light leaking from the control surface S _cont and returning it to the light guide plate 1. Further, diffusion dots 5 for irregularly reflecting light are formed on the light distribution control surface _Scont . Therefore, as shown by the arrow X, the light incident on the incident surface S _in of the light guide plate 1 from the light source 2 is reflected between the exit surface S _out and the light distribution control surface S _{cont of} the light guide plate 1 while reflecting the reflective layer 4 and the diffusion dots. The light is diffused (scattered) by 5, exits from the exit surface S _out, and exits through the diffusion layer 3.

Further, a transparent plate 6 made of glass or the like is provided on the diffusion layer 3, and a display pattern such as letters, symbols, figures, and photographs, for example, an “ABC” ink layer 7 is printed on the transparent plate 6. . As a result, the ink layer 7 of the display pattern is illuminated on the exit surface S _out of the light guide plate 1 to realize a display plate having good visibility. In addition, the ink layer 7 may be stamped by laser processing or the like instead of the ink layer 7.

JP 2013-11768 A JP 2008-310324 A JP 2008-70533 A

http://www.aist.go.jp/aist_j/press_release/pr2010/pr20101209/pr20101209.html#d1, National Institute of Advanced Industrial Science and Technology, December 9, 2010

  However, in the above-described conventional display board, the printed or stamped display pattern can be visually recognized, but the visible light source 2 maintains the lighting state in order to set the background mode of the display board. There is a problem that there is no change in performance, and the performance and alerting power are small.

  Note that a liquid crystal panel can be provided on the diffusion layer 3 side of the light guide plate 1 of the display plate of FIG. 3 so that the change in the display pattern can be visually recognized. In this case, however, the manufacturing cost increases significantly. There is a limit to enlargement.

  In order to solve the above-mentioned problem, a display plate according to the present invention includes a light guide plate having a surface as an exit surface and a side surface as an entrance surface, a photochromic layer provided on the exit surface of the light guide plate and forming a display pattern, A first light source provided on the incident surface of the light guide plate for making the colored light of the photochromic layer incident on the light guide plate and a light source provided on the incident surface of the light guide plate for making the decolored light of the photochromic layer incident on the light guide plate And a second light source. As a result, when the second light source is turned on for setting the background mode, if the first light source is blinked, the display pattern formed by the photochromic layer changes, that is, blinks.

  According to the present invention, since the display pattern formed by the photochromic layer changes, that is, blinks, it is possible to produce a new appearance and alert.

The 1st Embodiment of the display board which concerns on this invention is shown, (A) is a front view, (B) is the BB sectional drawing of (A). The 2nd Embodiment of the display board which concerns on this invention is shown, (A) is a front view, (B) is the BB sectional drawing of (A). The conventional display board is shown, (A) is a front view, (B) is the BB sectional drawing of (A).

  1A and 1B show a first embodiment of a display panel according to the present invention, in which FIG. 1A is a front view and FIG. 1B is a cross-sectional view taken along line BB in FIG.

  In FIG. 1, a patterned photochromic layer 8 is formed on the transparent plate 6 of FIG. 3 to form a display pattern consisting of characters “WELCOME” and arrow symbols. The photochromic layer 8 is colored with ultraviolet rays and decolored with visible light. Further, in addition to the visible light source 2, an ultraviolet light source 9 for emitting colored light of the photochromic layer 8 is added. In this case, the decoloring light of the photochromic layer 8 is emitted by the visible light source 2.

Generally, a photochromic material is a material that absorbs light of a certain wavelength and changes its bandgap state, and the wavelength of the absorbed light changes. Therefore, the photochromic material is reversibly colored by changing the wavelength of the applied light. State, decoloring state. Examples of such a photochromic material include diarylethene, spiropyran, azobenzene, and the like for organic substances (refer to Patent Documents 2 and 3), and tungsten oxide, molybdenum oxide, titanium oxide, and barium magnesium silicate (BaMgSiO) for inorganic substances. ₄ ) and the like (see Non-Patent Document 1). However, tungsten oxide, molybdenum oxide, and titanium oxide are colored blue with ultraviolet rays, but there are problems with reversibility, durability, and the like.

  For example, when the photochromic layer 8 is diarylethene, it is colored with the ultraviolet light of the ultraviolet light source 9 as colored light, and on the other hand, it becomes colorless with visible light of the visible light source 2 as decoloring light. By changing the substituent, the coloring becomes red, green, and blue. Thinning is also possible. Therefore, the photochromic layer 8 is colored while the ultraviolet light source 9 is irradiated with ultraviolet rays, and after the ultraviolet irradiation, the photochromic layer 8 is faded by visible light from the visible light source 2. At this time, in order to maintain the colored state, the ultraviolet light may be irradiated at an appropriate interval by the ultraviolet light source 9.

  When the photochromic layer 8 is spiropyran, the colored light is colored blue or bluish purple by the ultraviolet light of the ultraviolet light source 9, and on the other hand, it becomes colorless by the visible light or heat of the visible light source 2 as the decoloring light. Although this spiropyran is colored in a solvent, it is colored even in a solid state by taking it into a polymer such as polystyrene or ABS resin that is soluble in an organic solvent such as acetone or toluene and re-solidifying it. Therefore, the photochromic layer 8 is colored while the ultraviolet light source 9 is irradiated with ultraviolet rays, and after the ultraviolet irradiation, the photochromic layer 8 is faded by visible light from the visible light source 2. At this time, in order to maintain the colored state, the ultraviolet light may be irradiated at an appropriate interval by the ultraviolet light source 9.

  Thus, in the display panel of FIG. 1, the photochromic layer 8 is colored with invisible light (in this case, ultraviolet light), and on the other hand, it is decolored (or faded) with visible light. When the light is turned off, the display pattern formed by the photochromic layer 8 is visually recognized as a change, for example, blinking. In this case, the visible light source 2 is lit for the background mode. As a result, it is possible to produce a new appearance and alert.

  2A and 2B show a second embodiment of the display panel according to the present invention, in which FIG. 2A is a front view and FIG. 2B is a cross-sectional view taken along line BB in FIG.

  In FIG. 2, a photochromic layer 10 is provided instead of the photochromic layer 8 of FIG. 2, and an infrared light source 11 for emitting decoloring light of the photochromic layer 10 is added in addition to the light sources 2 and 9.

  That is, the photochromic layer 10 is colored with the ultraviolet light of the ultraviolet light source 9 as colored light, and becomes colorless with the infrared light of the infrared light source 11 as decoloring light. Such a photochromic layer 10 is currently under development. Therefore, the photochromic layer 10 is colored during the ultraviolet light irradiation of the ultraviolet light source 9, and the photochromic layer 10 is faded by the infrared light of the infrared light source 11 after the ultraviolet light irradiation. At this time, in order to maintain the colored state, the ultraviolet light may be irradiated at an appropriate interval by the ultraviolet light source 9.

  As described above, in the display panel of FIG. 2, the photochromic layer 10 is colored with invisible light (in this case, ultraviolet light), and on the other hand, decolored (or faded) with invisible light (in this case, infrared light). To do. Therefore, even when the visible light source 2 in the background mode is in a lighting state, when the ultraviolet light source 9 is turned on and off, and the infrared light source 11 is turned off and on, the display pattern formed by the photochromic layer 10 changes, for example, blinks. Is visually recognized. As a result, it is possible to produce a new appearance and alert.

In the above-described embodiment, the photochromic layers 8 and 10 are provided on the transparent plate 6, but may be provided directly on the emission surface S _out of the light guide plate 1.

  In addition, the present invention can be applied to any change in the obvious range of the above-described embodiment.

1: Light guide plate 2: Visible light source 3: Diffusion layer 4: Reflection layer 5: Diffusion dot 6: Transparent plate 7: Ink layer 8: Photochromic layer 9: Ultraviolet light source 10: Photochromic layer 11: Infrared light source

Claims (6)

A light guide plate having the surface as the exit surface and the side as the entrance surface;
A photochromic layer provided on the light exit surface of the light guide plate to form a display pattern;
A first light source provided on an incident surface of the light guide plate, and causing the colored light of the photochromic layer to enter the light guide plate;
A display plate, comprising: a second light source provided on an incident surface of the light guide plate and causing the decolored light of the photochromic layer to enter the light guide plate.   The display panel according to claim 1, wherein the first light source is an invisible light source, and the second light source is a visible light source.   The display panel according to claim 2, wherein the invisible light source is an ultraviolet light source.   The display panel according to claim 2, wherein the visible light source is also a background mode light source for irradiating an ink layer or a stamp formed on an exit surface of the light guide plate.   The display panel according to claim 1, wherein the first light source is a first invisible light source, and the second light source is a second invisible light source. The display panel according to claim 5, wherein the first invisible light source is an ultraviolet light source, and the second visible light source is an infrared light source.

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