JPH0738945Y2 - Display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a display device suitable for application to a mark plate or the like of an automobile, and particularly to letters, numbers, marks, symbols, or combinations thereof (hereinafter These are collectively referred to as a display section) and are related to a display device for three-dimensionally displaying.

[Prior Art] Conventionally, a display device for giving a stereoscopic effect or a depth feeling to a display portion such as a display character formed on a display plate is generally configured as shown in FIGS. 4 and 5. Things are known. This will be briefly described with reference to the drawings.
Is a display plate formed of a transparent resin or the like, and a display portion 2 made of, for example, a display character "AB" or the like is recessed on the back surface side thereof with a predetermined depth d (about 0.5 mm). Further, a light shielding film layer 3 made of black paint or the like is formed on the back surface of the display plate 1 except the display portion 2 to form a ground color portion, and the display portion 2 has a semi-transmissive film layer 4 having a constant film thickness. Are formed. The semi-transmissive film layer 4 is formed by depositing aluminum fine particles, and has a transmittance of about 20%. 5 is a display board 1
A surface light source 6 such as an EL light-emitting body that illuminates the display unit 2 is disposed behind the filter 5 behind the filter 5.

In the display device having such a configuration, since the display section 2 has a depth d of about 0.5 mm in the daytime, when the display plate 1 is exposed to external light from an oblique direction, the display section 2 is provided with the semi-transmissive film layer 4.
As a result, the characters and the like on the display unit 2 have a three-dimensional or depth feeling because the display unit 2 has a shadow on the side opposite to the light irradiation direction around the display unit 2. That is, for the stereoscopic effect in the daytime, it can be expressed that the display unit 2 is recessed. But,
When the display unit 2 is illuminated by the light source 6 at night, the diffused light diffused by the filter 5 is evenly applied to the semi-transmissive film layer 4. The semi-transmissive film layer 4 merely acts as a light-attenuating film, and the filter 5 is seen through the display plate 1. Therefore, the display unit 2 cannot be shaded from any direction.

FIG. 6 is a diagram showing a luminance distribution when the display device is installed on a 100-nit uniform surface light-emitting body and the display unit 2 is illuminated. As is clear from this figure, the display 2 has a distribution in which the brightness sharply rises. Therefore, when this is viewed in the dark, it can be seen only that the display 2 has the same brightness in the dark. Therefore, the display has no stereoscopic effect.

Then, as a method for solving such a problem, for example, a display plate disclosed in Japanese Utility Model Laid-Open No. 62-201786 is proposed. As shown in FIG. 7, the display board includes a translucent character print layer 8 and a character shadow print layer 9 that form a display portion.
A light-shielding film layer 3 that covers a portion other than the display portion is laminated on one surface or both surfaces of the display plate 1. Regions I and II where the light-shielding film layer 3 is not applied form a display portion composed of display characters such as A and B, and the character shadow printing layer 9 is formed.
This creates a shadow on the display.

FIG. 8 is a diagram showing a luminance distribution when the display plate is installed on a 100 nit uniform surface light-emitting body and the display area is illuminated. As is clear from this figure, the portion a in which only the character portion printing layer 8 is applied and the character shadow portion printing layer 9 and the light shielding film layer 3 are not applied, and the character portion printing layer 8 and the character shadow portion printing layer There is a clear difference in brightness from the portion b in which 9 is provided and the light-shielding film layer 3 is not provided, and this portion b causes a shadow on the display portion. Therefore, the display has a stereoscopic effect.

[Problems to be Solved by the Invention] However, in the above-mentioned display panel, it is true that only the character portion printing layer 8 is provided, and the character shadow portion printing layer 9 and the light shielding film layer 3 are not provided, Although there is a clear difference in brightness between the character print layer 8 and the character shadow print layer 9 and the part b where the light shielding film layer 3 is not applied, there is a regular change in brightness, but the rise thereof occurs. Is sharp and has a digital change like the case of the luminance distribution shown in FIG. Therefore, when looking at the areas I and II of the display section that are actually illuminated by the light source, there is a drawback that they have a three-dimensional effect, but they are somewhat impractical because they are not practical and lack a high-class appearance.

The reason for this is that digital changes are illustrious and differ from the way shading is applied in painting techniques.
In other words, the shade in the painting is attached so that the density gradually changes from the bright part where the light hits, which is an analog change. And, it can be said that this analog change is more faithful to the real three-dimensional effect of the object, unlike the digital change.

Therefore, the present invention has been made in view of the above-described conventional problems, and the purpose thereof is to produce an analog shade similar to a painting on the display unit so that the display unit is not thin and has a high-class feeling. It is to provide a display device that enables a certain three-dimensional display.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a display portion such as a display character formed by a protrusion on the back surface of a display plate made of a translucent material, and the surface of the protrusion is Forming a non-translucent character portion printing layer, forming a high light transmittance character shadow film layer on the entire back surface of the display plate including the character portion printing layer, behind the display plate,
In addition to the portion corresponding to the display portion and its peripheral portion, a filter having a light shielding film layer and a light source are arranged.

[Operation] In the present invention, when the light from the light source is applied to the display plate through the filter, the illumination brightness produces very bright parts on both sides of the outline of the display part of the character part printing layer, and it is far from that part. Then, it makes an analog change that gradually gets darker.

[Embodiment] Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

FIG. 1 is a sectional view taken along the line II of FIG. 2 showing an embodiment of a display device according to the present invention, and FIG. 2 is a front view of the main part of the device. In these figures, reference numeral 1 is a display plate made of a translucent material, for example, smoked acrylic resin, and a display portion 2 of a display character "EF" is provided on the back surface of the display plate 1 so as to project. That is, the display unit 2 is formed by the protrusion. The protrusion dimension d ₁ of the protrusion protruding from the back surface of the display plate is 0.6 m.
At about m, the angle Θ between the side surface of the protrusion and the normal to the back surface of the display panel is about 21 °. An opaque character printing layer 11 is formed on the surface of the display unit 2, that is, the surface of the protrusion forming the display unit 2, and the character printing layer 11 is formed on the back surface of the display plate 1. A character shadow film layer 12 having a high light transmittance is formed over the entire surface including the above. The character portion printing layer 11 is formed by silk-printing a gray opaque paint, for example. The character shadow film layer 12 is formed by applying a smoke paint having a high transmittance.

Reference numeral 13 denotes a filter interposed between the back surface of the display panel 1 and the EL light emitting body 6 as a light source. The filter 13 is formed of a transparent polyester sheet or the like, and one surface thereof has a light emitting portion of the display panel 1. The light-shielding film layer 3 is formed by printing so as to define The light-shielding film layer 3 is provided on the display unit 2 of the display panel 1.
Is formed over the entire circumference from the portion corresponding to and the character contour, for example, the area A which is released by w (about 0.8 mm).

FIG. 3 is a diagram showing a luminance distribution when the display unit having the above-mentioned structure is installed on a 100-nit uniform surface light-emitting body and the display unit 2 is illuminated. In the figure, the transmittance is very high in the peripheral portion of the display unit 2, that is, in the vicinity of the rising edge of the display character protrusion of the character portion printing layer 11, and gradually decreases toward the outside, that is, it changes in an analog manner. When it exceeds 1 mm, the light is blocked by the light shielding film layer 3 of the filter 13, so that the transmittance becomes substantially constant. This analog brightness change (B
Part) occurs on the entire circumference of the contour of the display unit 2 and forms a shadow of the display unit 2. Therefore, the display unit 2 can have a three-dimensional effect, and because of the analog-like brightness change, the stereoscopic effect can be expressed more realistically and more faithfully than the conventional digital brightness change.

Further, since the light-shielding film layer 3 of the filter 13 limits the illumination range of the display plate 1, the boundary line 15 (third part) between the part that slightly shines in the area A in the peripheral part of the display part 2 and the part that does not shine at all (third part)
Figure) can be formed. The distance between the boundary line 15 and the outer circumference of the display contour changes depending on the viewing direction due to the influence of the display character projection. This decrease also contributes to further emphasize the stereoscopic effect of the display unit 2.

In the daytime, the display portion 2 is formed by the protrusion, and a shadow is formed by the protrusion dimension d ₁ , so that a stereoscopic effect can be obtained.

[Effects of the Invention] As described above, the display device according to the present invention has a display portion such as a display character formed of a protrusion formed on the back surface of the display plate, and the surface thereof is covered with the non-translucent character portion printing layer. Cover, the entire back surface of the display plate is covered with a highly transparent character shadow film layer, a filter is provided at the rear of the display plate, and a light-shielding film layer that defines the light emitting portion of the display body is formed on the filter. When the back surface of the display board is illuminated from behind the filter by
Since the light passes through the character shadow film layer, very bright parts are formed on both sides of the outline of the display part of the character part print layer, and the brightness gradually decreases as it goes away from the display part. It is possible to obtain a desired luminance change, and therefore, it is possible to visually give the display unit a stereoscopic effect that is closer to the actual one, and it is possible to improve the classiness of the display device.

[Brief description of drawings]

FIG. 1 is a sectional view taken along the line II of FIG. 2 showing an embodiment of a display device according to the present invention, FIG. 2 is a front view of a main part of the device, and FIG.
FIG. 4 is a luminance distribution diagram of the display device according to the present invention installed on a uniform surface light-emitting body and illuminating the display portion. FIGS. 4 and 5 are front and sectional views showing a conventional example of the display device. FIG. 6 is a luminance distribution diagram when a conventional display device is installed on a uniform surface light-emitting body and a display portion is illuminated, and FIG. 7 is a cross-sectional view of a main part of a display plate showing another example of the conventional device, FIG. 8 is a luminance distribution diagram in the case where the display plate of FIG. 7 is installed on the uniform surface light-emitting body and the display section is illuminated. 1 ... Display part, 2 ... Character part, 3 ... Shading film layer, 4 ...
Semi-transparent film layer, 5 ... Filter, 6 ... Light source, 8 ... Character print layer, 9 ... Character shadow print layer, 11 ... Character print layer, 12 ... Character shadow film layer, 13 ... …filter.

Claims (1)

[Scope of utility model registration request] 1. A display part, such as a display character, formed of a protrusion is provided on the back surface of a display plate made of a translucent material, and a non-translucent character portion printing layer is formed on the surface of the protrusion to form the character. A high-transmittance character shadow film layer is formed on the entire back surface of the display plate including the partial print layer, and a light-shielding film layer is formed behind the display plate except for the portion corresponding to the display portion and its peripheral portion. A display device having a filter and a light source.