JPH0248868Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a display device that can illuminate a plurality of display sections with the same illumination color.

[Conventional technology]

Light emitted from a light source is introduced into a light guide, and the light is emitted toward a display board, so that a plurality of display sections provided on the display board are illuminated simultaneously and with the same brightness and color. As display devices, those shown in FIGS. 2 and 3 are known. That is,
Reference numeral 1 denotes a transparent or light-transmitting display plate disposed on the top surface of the case 2, and a light-shielding film 4 is coated on the back side of the display plate 1 by coating a light-opaque ink such as black on a portion of the display plate 1. As a result, a plurality of display sections 3, for example, six display sections 3 consisting of characters, symbols, etc., provided at appropriate intervals in the longitudinal direction of the display board 1.
It has a to 3f. Further, on the back surface of the display panel 1, a text color ink layer 5 having a translucent property such as white is provided over the entire surface so as to cover the light shielding film 4.

On the top surface of the case 2, each of the display sections 3a to 3 is provided.
Openings 6a to 6f are provided corresponding to f, and inside there is a light bulb 7 as a light source and a transparent light guide 8 made of acrylic resin or the like that guides the light emitted from the light bulb 7 to each of the display sections 3a to 3f. and are provided. Light guide 8
The light bulb 7 is located in a portion corresponding to the display section 3a.
An insertion hole 9 is formed for accommodating the light guide 8.
A group of stipples 10 for reflecting the light from the light bulb 7 introduced into the light guide 8 in the direction of the display panel 1 is formed on the back surface of the display panel 1 at a portion corresponding to each of the display sections 3a to 3f.

In this case, since the brightness of the display parts 3a to 3f decreases as the distance from the light bulb 7 increases, the number of stipples and the density of stipples of each stipple group 10 are made different, and the farther from the light bulb 7 the more stipples are displayed. By densely forming a large number of display units 3a to 3f, uniform illumination of the display units 3a to 3f is achieved. Furthermore, display parts 3a, 3 near the light bulb 7
b and 3c are illuminated by the direct light emitted from the light bulb 7, and are too bright compared to the other display parts 3d to 3f, so it is insufficient to simply change the number of dots and their density; Light control layers 11a, 11b, and 11c are provided to reduce the amount of light. These light control layers 11a, 11b, 11
c is the surface of the character ink layer 5 and the display portions 3a, 3b,
It consists of an achromatic ink layer of white, gray, etc. with poor light transmittance applied to the portion corresponding to 3c, and is formed so that the closer it is to the light bulb 7, the worse the light transmittance is.

[Problem that the invention attempts to solve]

By the way, in such a conventional display device, although all of the display sections 3a to 3f can be illuminated with substantially uniform brightness, there is a disadvantage that the illumination color of each display section 3a to 3f cannot be made equal. That is, the light emitted from the light bulb 7 includes visible light having various wavelengths, and the color varies depending on the wavelength. In particular, the shorter the wavelength, the more the light is absorbed while traveling through the light guide 8. Therefore, as the distance from the light bulb 7 increases, the amount of light with longer wavelengths becomes relatively larger than the light with shorter wavelengths, so the closer the display area is to the light bulb 7, the more whitish the illumination color becomes, and the further away from the light bulb 7, the more reddish the illumination color becomes. . Therefore, the illumination does not give equal color impressions to the eyes, resulting in unbalanced illumination.

[Means for solving problems]

The display device according to the present invention was developed to solve the above-mentioned problems, and by applying a light-shielding film on the back side, leaving a part of the light-shielding film, the display device can be used as a light-transmitting display board having a plurality of display parts. , comprising a light source for illuminating each display section, and a light guide disposed on the back surface of the display board to guide the light from the light source to each display section, and the display section farther from the light source has a longer wavelength of light. A light-transmitting color correction printed layer that cuts out a large amount of light is interposed between the display plate and the light guide in correspondence with the display section.

[Effect]

In this invention, a correction printing layer is provided to cut out long wavelength light for the display part far from the light source.
Since wavelength control is performed, all display sections can be illuminated with almost the same illumination color.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 is a sectional view showing an embodiment of a display device according to the present invention. In this embodiment, color correction printing layers 2 are arranged corresponding to display parts 3d, 3e, and 3f that are far from the light source 7.
The only difference from the conventional device shown in FIG. 2 is that numbers 1, 22, and 23 are provided on the surface of the character color ink layer 5, and all other structures are the same. Therefore, the same constituent members are designated by the same reference numerals and their explanations will be omitted.

The color correction printing layers 21, 22, 23 are the light bulb 7.
It is composed of a translucent ink layer that cuts out long wavelength light to a greater extent as it is farther from the bulb 7, and controls the amount of transmitted light to a greater degree as it is closer to the bulb 7. Therefore, the light from the bulb 7 is white. In the case of light, the color correction print layer 21 forms a blue-green ink layer, the color correction print layer 22 forms a light blue ink layer, and the color correction print layer 23 forms a dark blue ink layer.

Thus, according to the display device having such a configuration, it is possible to make the illumination colors of each of the display sections 3a to 3f substantially equal. That is, in the display section 3f that is farthest from the light bulb 7, light with a short wavelength is absorbed to the greatest extent by the light guide 8, and therefore it is illuminated by light with a long wavelength and becomes reddish. Since this long-wavelength light is blocked by the color correction printing layer 23, the reddish tinge is reduced, resulting in a whitish illumination color. Similarly, the display parts 3d and 3e have a yellowish tinge because light with a slightly shorter wavelength than red passes through them, but this light is cut off when passing through the color correction printed layers 21 and 22, respectively. Therefore, it becomes white as well. As a result, all of the display sections 3a to 3f have a white illumination color, giving the same color sensation to the eyes. Also,
The light transmittance of each color correction printed layer 21, 22, 23 varies by changing its thickness, and the closer the light bulb 7 is to the light bulb 7, the greater the degree of control over the amount of transmitted light. The amount of light is also approximately equal, and it is possible to illuminate with uniform brightness.

Here, in this embodiment, the case where a white light bulb 7 is used has been explained, but if the light bulb 7 is covered with an appropriately colored filter or the display board 1 is colored with an appropriate color, the color can be changed. The color of each color correction printing layer 21, 22, 23 may be changed accordingly.

Further, the color correction printing layer may be provided on the upper surface of the light guide corresponding to a predetermined display section, or the printing layer may be provided on the surface of a transparent plate installed between the display board and the light guide. good.

[Effect of idea]

As explained above, the display device according to the present invention is
A translucent color correction printed layer, which cuts out longer wavelength light to a greater degree as the display area is farther from the light source, is provided on the back side of the display board in correspondence with the display area, so all display areas can be It is possible to illuminate with almost the same illumination color, and in particular, it is possible to give the same color feeling to the eyes and improve the illumination effect.

[Brief explanation of drawings]

FIG. 1 is a partially exploded sectional view showing an embodiment of the present invention, and FIGS. 2 and 3 are an external perspective view and a partially exploded sectional view of a conventional display device. 1... Display board, 2... Case, 3a to 3f...
Display part, 4... Light shielding film, 5... Text color ink layer,
7...Light bulb, 8...Light guide, 10...Stippling, 11
a to 11c...light control layer, 21 to 23...print layer for color correction.

Claims (1)

[Scope of utility model registration request] A light-transmitting display board having a plurality of display parts by applying a light-shielding film with a part of the light-shielding film left on the back surface;
It includes a light source for illuminating each display section, and a light guide disposed on the back surface of the display board that guides the light from the light source to each display section, and the display section farther from the light source transmits the light with a longer wavelength. A display device characterized in that a transparent color correction printed layer having a high degree of cutting is interposed between the display plate and the light guide corresponding to the display section.