JP2598605Y2 - Reflective display - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a reflective display device,
In particular, the present invention relates to a reflective display device using a translucent reflective member as a reflective member.

[0002]

2. Description of the Related Art A reflection type display device is mounted on a vehicle for displaying a vehicle speed, an engine speed, various warnings, etc., and is conventionally used as a device of this type having a structure shown in FIGS. There was something.

In the apparatus shown in FIG. 2, a reflecting surface 1a of a half mirror 1, which is a semi-transmissive reflecting member, is arranged toward a driver E who views a display, and is opposed to the reflecting surface 1a above the half mirror 1. In addition, a display device 2 for displaying vehicle speed, engine speed, and the like is arranged, and a display 3 for displaying various warnings by turning on a lamp is arranged on the back surface of the half mirror 1. With this configuration, the driver E
Indicates that the display of the display device 2 is the reflection surface 1a of the half mirror 1.
The virtual image 2a reflected behind the virtual image 2a is always visually recognized, and the warning display performed by turning on the lamp of the display 3 is transmitted through the half mirror 1 and visually recognized.

The apparatus shown in FIG. 3 has a configuration in which a display device 2 is disposed on the back surface of a half mirror 1 and a concave mirror 4 is disposed opposite to the display device 2 with the half mirror 1 interposed therebetween. With this configuration, the driver E always sees the virtual image 2a formed behind the display of the display device 2 after being transmitted by the half mirror 1 and reflected by the concave mirror 4 and the reflection surface 1a of the half mirror 1. .

[0005]

As shown in FIG. 4, the half mirror 1 is generally made of Al or TiO ₂ by vapor deposition or sputtering on the surface of the transparent light-transmissive substrate 11 which is to become the reflection surface 1a. Is formed by forming the reflection film 12 of the above. The reflection film 12 is a half mirror 1
Is formed to be extremely thin in terms of function and to have translucency, so that most of the light incident on the reflection surface 1 a
Is partially reflected, passes through the reflective film 12, reaches the substrate 11, passes through the substrate 11, reaches the back surface of the substrate 11, is reflected by this back surface, and passes through the reflective film 12 again. And then to the outside.

As described above, when light from one point is reflected by the front surface of the reflective film 12 and the back surface of the substrate 11, two virtual images are visually recognized by two reflected lights passing through two different optical paths. This causes a problem that a double image as shown in FIG. 5 is generated as a display image, thereby deteriorating the display quality.

In order to make such a double image inconspicuous, the base material 11 may be thinned so that two virtual images are formed close to the eye resolution or less. If the thickness is reduced, problems occur in terms of strength and the like, and there is a limit. Therefore, it is difficult to eliminate the double image.

[0008] Thus, the present invention has been made in view of the conventional problems described above, in which images are displayed by reflection image reflected by the semitransparent reflecting member, the semitransparent reflective member Toru
It is an object of the present invention to provide a reflective display device capable of avoiding generation of a double image due to front and rear surface reflection while maintaining transientness.

[0009]

In order to solve the above-mentioned problems, a reflective display device according to the present invention comprises a semi-transmissive reflective film formed by forming a semi-transmissive reflective film on the surface of a transparent substrate. In a display that performs display by a reflection image reflected by a member, the amount of transmitted light is adjusted between the base material and the reflection film.
The semi-transmissive reflecting member is formed by forming a permeable film for adjusting the reflection. Further, the invention is characterized in that a non-reflective film is coated on the back surface of the base material. Furthermore, the invention is characterized in that the transmission film is made of a colored film having wavelength selectivity.

[0010]

According to the above configuration, since the semi-transmissive reflecting member is formed by forming a transmissive film for adjusting the amount of transmitted light between the transparent substrate and the reflective film, Even if the light transmitted through the reflective film is reflected on the back surface of the base material and forms a double image together with the light reflected on the reflective film, the distance between the base material and the reflective film may be reduced.
The presence of a permeable film on the
Since the light reflected on the back surface passes through the transmission film twice, the transmittance of the transmission film that determines the amount of transmitted light is appropriately set so that the light passes through the reflection film and the back surface of the base material.
The light reflected by is now greatly attenuated compared to the light that simply passes through the reflective member, maintaining the transparency of the reflective member
It is suppressed to the extent that the same do not notice even a double image is formed while. In addition, the presence of a non-reflective film on the back surface of the base material reduces the reflectance at the boundary on the back surface of the base material and increases the transmittance of the film, thereby suppressing reflection on the back surface of the base material.
The formed double image is suppressed so as not to notice further
You. Further, by forming a colored film further comprising a wavelength-selective permeation membrane for adjusting the amount of transmitted light, it is possible also to provide a color filter function permeable membrane.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1A shows a half mirror 1 which is a semi-transmissive reflection member used in the reflection type display device according to the present invention.
1 shows an example of the cross-sectional structure of FIG. The half mirror 1 includes a transparent base material 11, a transmission film 13 made of a metal film formed by depositing or sputtering chromium, copper, gold, or the like on the surface serving as the reflection surface 1 a of the base material 11, and a transmission film 13. and a reflecting film 12. such as Al or TiO ₂ formed by vapor deposition or sputtering on the surface of the.

Assuming that the reflectance of the reflective film 12 is R1, the transmittance of the transmission film 13 is T1, and the reflectance and transmittance of the substrate 11 are R2 and T2, the transmittance T1 of the transmission film 13 becomes It can be easily adjusted by controlling the material and thickness of the formed metal film.

Due to the presence of the transmission film 13, a part of the light A incident on the reflection surface 1a of the half mirror ₁ is reflected by the reflection film 12 and reaches the driver's eyes, and the other part B ₂ Is transmitted through the reflection film 12, the transmission film 13, and the base material 11 to reach the back surface of the base material 11, and is reflected by the back surface, passes through the base material 11, the transmission film 13, and the reflection film 12, and becomes a driver's eye. Leads to. The amount of light incident on the substrate 11 can be adjusted by changing the transmittance by changing the thickness of the transmission film 13.

The light B ₂ reaching the driver's eyes is reflected by the reflection film 12,
It passes through the permeable membrane 13 and the substrate 11 twice, and
1 once, the product of the transmittance of the permeable film 12 and the transmittance and reflectance of the substrate 11, ie, (T1 · T
2) receiving the attenuation of ² · R2, a very weak light compared to the light B _1. Therefore, even double image due to the light B ₁ and the light B ₂ is formed, because the driver can not visually recognize the image by light B _2, it will not be recognized as a double image.

[0015] In the above embodiment, although invisible to double image by the action of the permeable membrane 13, as shown in FIG. 1 (b), on the back surface of the base material 11, Toka example URN H ₃ F ₂ By forming a non-reflective film 14 by laminating multilayer films made of materials having different refractive indexes to lower the reflectance on the back surface of the substrate 11, the reflective film 12, the transmission film 13 and the substrate 11 are reduced.
The of the light B ₂ that transmitted to reach the back surface of the substrate 11 largely B 'transmitted through the non-reflection film 14 exits on the back surface side of the substrate 11, the reflection on the back surface of the substrate 11 is decreased, Substrate 11, transmission film 13 and reflection film 1 after being reflected on the back surface of substrate 11
2 light B ₃ reaching the eyes of the transmitted to the driver of the becomes extremely weak, it is not possible to generate a double image.

Incidentally, a fluorescent display tube (VFD) is often used as a display device of a reflection type display device.
In the case of a fluorescent display tube, its display color is limited to the fluorescent paint used for the fluorescent display tube. In such a case, a color filter plate for changing a display color to a desired color is arranged on the display surface of the fluorescent display tube. However, the above-described arrangement in which the display device and the concave mirror are arranged with the half mirror 1 interposed therebetween. In the case of the reflective display device having the configuration described above, by forming a colored film having wavelength selectivity as the transmission film 13 of the half mirror 1,
The transmissive film 13 can also have a function as a color filter, so that it is not necessary to separately arrange a color filter plate in the fluorescent display tube.

[0017]

As described above, according to the present invention, a semi-transmissive reflection member having a transmission film formed between a transparent substrate and a reflection film for adjusting the amount of transmitted light is provided. since we are using, by leaving appropriately setting the transmittance of the permeable membrane which determines the transparently quantity, transmitted and reflected by the rear surface of the substrate a reflective film
The reflected light is greatly attenuated compared to the light transmitted through the reflecting member, and the transmission of the reflecting member is maintained while suppressing the formation of a double image so as not to be noticed. is as becomes, the table by the front and back surfaces reflecting the light transmissive reflecting member
It is possible to avoid the occurrence of a double image that lowers the display quality .

Further, the reflection on the inner surface of the base material is reduced by the anti-reflection film on the back surface of the base material, so that the occurrence of a double image can be prevented more reliably.
To adjust the amount of transmitted light because the transmittance on the back of
The rear surface of the transmission is smaller passes through the reflective film substrate permeable membrane
The amount of light reflected by the reflector can be reduced,
Transitivity is maintained, and it is also possible to prevent the brightness of a display image viewed through the reflecting member from being swirled .

Further, by forming a transmission film for adjusting the amount of transmitted light from a colored film having further wavelength selectivity, the transparent reflection member can also have a color filter function.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a cross-sectional structure of a half mirror used in a reflective display device according to the present invention.

FIG. 2 is a diagram showing an example of the reflective display device according to the present invention.

FIG. 3 is a view showing another example of the reflective display device according to the present invention.

FIG. 4 is a view showing an example of a half mirror conventionally used in the reflection type display device shown in FIGS. 2 and 3;

FIG. 5 is a diagram illustrating a problem of a double image generated in the half mirror of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Semi-transmissive reflective member (half mirror) 11 Base material 12 Reflective film 13 Transmissive film 14 Non-reflective film

Claims (3)

(57) [Scope of request for utility model registration] 1. A display which performs display by a reflection image reflected by a semi-transmissive reflection member having a semi-transmissive reflection film formed on a surface of a transparent base material, wherein the base material and the reflection film are To adjust the amount of transmitted light during
Wherein the transmissive film is formed to constitute the semi-transmissive reflective member. 2. The reflection type display device according to claim 1, wherein an anti-reflection film is coated on a back surface of said base material. 3. The reflection type display device according to claim 1, wherein said transmission film is made of a colored film further having wavelength selectivity.