JPH04129172U - Vehicle display device - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to prevent display washout in a vehicle display device even when a large amount of external light enters a non-specular reflection hologram plate. Structure: A non-specular reflection hologram plate 3 includes a plurality of hologram patterns, each having a different non-specular reflection angle. By Bragg-reflecting the external light incident on the non-specular reflection hologram plate in a direction corresponding to the non-specular reflection angle of the plurality of hologram patterns, the amount of external light incident on the display surface 12a of the display device 12 is reduced. .

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is installed on the dashboard with non-specular reflection by a non-specular reflection hologram plate. The displayed image of the display unit is reflected toward the driver's seat by a reflective surface placed within the field of vision in front of the driver's seat. so that the display image of the display device can be visually recognized within the field of view of the windshield. A vehicle display device commonly called a head-up display (HUD). related.

0002

[Conventional technology]

This type of conventional vehicle display device will be explained using FIG. 4. Vehicle display device shown The display image of the display device 12 arranged in the dashboard 11 is displayed using a non-specular reflection hologram. The reflected image is reflected non-regularly by the mirror plate 13, and the reflected image is reflected onto the inner surface of the windshield 14, for example. The imaginary image of the displayed image is reflected to the driver's seat side by a reflective surface formed on the The image 16 is made visible within the field of view of the windshield 14. this This prevents the driver from taking his eyes off the windshield 14 while driving. You can visually check vehicle speed etc.

0003 In addition, the non-specular reflection hologram plate 13 meets the conditions of the Bragg reflection formed thereon. A hologram pattern with wavelength selectivity allows light of selected wavelengths to be directed non-directly shoot As shown by A in the figure, even if external light is incident, the wavelength is different from the selected wavelength of the external light. The light of this wavelength is not reflected by Bragg and does not reach the display surface 12a of the display 12. stomach. In addition, external light that is specularly reflected on the surface of the non-specular reflection hologram plate 13 is reflected on the surface of the display 12. It can be placed at a position where the light does not directly enter the display surface 12a. Therefore, the table The amount of external light incident on the display surface 12a of the indicator 12 is reduced, and the washout of the display is reduced. It is designed to prevent

0004

[Problem that the idea aims to solve]

The above-mentioned conventional vehicle display devices only display external light with approximately the same wavelength as the selected wavelength. It does not enter the display surface 12a of the device 12. However, light such as direct sunlight Since the amount of light is very large when it enters the reflection hologram plate 13, it is not selected. Even if only the light with the same wavelength is incident, the level is high and reaches the display surface 12a of the display 12. Washout may occur, and a sufficient washout elimination effect may not be obtained. It was hard to say that it was.

[0005] Therefore, in view of the above-mentioned conventional points, the present invention is designed to reduce the amount of light such as direct sunlight. Even when a large amount of external light enters the non-specular reflection hologram plate, the display surface of the display A vehicle that can prevent display washout by reducing the effects of incident external light. Provides a display device for

[0006]

[Means to solve the problem]

In order to solve the above problems, the vehicle display device made according to the present invention has a non-specular reflection light. Driving with a display image on the dashboard that is non-specularly reflected by the programmable board. The display image of the display unit is reflected toward the driver's seat by a reflective surface placed within the field of vision in front of the seat. In a vehicle display device that makes it possible to see the The non-specular reflection hologram plate has a plurality of holograms each having a different non-specular reflection angle. It is characterized by having a pattern.

[0007]

[Effect]

With the above configuration, when external light is incident on the non-specular reflection hologram plate, the non-specular reflection hologram plate The external light Bragg-reflected by the programmable plate is narrowed down to wavelengths that are approximately the same as the selected wavelength, and further This focused external light is reflected by the presence of multiple hologram patterns on the non-specular reflection hologram plate. Bragg reflection occurs in the direction corresponding to the non-specular reflection angle, so the light incident on the display surface of the display device is The amount of external light that is generated is reduced.

[0008]

【Example】

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2. In these figures , parts equivalent to those described above with respect to Figure 4 are given the same reference numerals and A detailed explanation will be omitted.

[0009] In the figure, a non-specular reflection multiple exposure hologram plate 3 has a plurality of first to n-th holograms. It is provided with a frame pattern and is disposed at a position facing the display 12. display As shown by L, the display light of the device 12 is θ with respect to the non-specular reflection multiple exposure hologram plate 3. ₂ When the incident angle is , the first hologram of the non-specular reflection multiple exposure hologram plate 3 θ depending on the pattern₁This reflected light is reflected at the reflection angle of the windshield 14. is incident on the reflective surface of This allows the displayed image from the display 12 to It is non-regularly reflected toward the reflective surface of the windshield 14, and this reflected image is reflected on the windshield 14. It is further reflected to the driver's seat side by the reflective surface, and when viewed from the viewpoint position 15, a virtual image 16 of the display image is created. It becomes visible within the field of view of the windshield 14.

On the other hand, the second to n-th hologram patterns reflect selected wavelength components of external light incident at an incident angle θ ₁ at reflection angles θ ₃ to θ _n , and the reflected light is incident on the display surface 12 a of the display 12. The amount of light is reduced, and only the component reflected by the first hologram pattern described above is incident on the display surface 12a.

[0011] The non-specular reflection multiple exposure hologram plate 3 described above is made of one side of a transparent substrate such as glass. For example, holograms coated with a holographic emulsion layer such as dichromate gelatin light-sensitive materials It is a photographic plate with multiple hologram patterns formed on it. The method will be explained using FIG.

The focal points of the photographic plate X and the first diverging lens 10 are such that the photographic plate They are arranged at positions such that the ten focal points correspond to each other. The optical axis L ₁₀ of the first diverging lens 10 is made to form an incident angle of θ ₂ with respect to the photographic plate X so as to coincide with the optical axis L of the display 12 . Further, the optical axis L 20 of the second diverging lens ₂₀ is made to form an incident angle of θ ₁ with respect to the photographic plate X so as to coincide with the direction of the reflective surface of the windshield 14 .

On the other hand, the laser beam from the laser generator 30 is separated into two directions by the beam splitter 40, and after the separated laser beams are reflected by mirrors 50 and 60, respectively, the first diverging lens 10 and the second A spherical wave laser beam is guided by a diverging lens 20 and obtained by a first diverging lens 10 and a second diverging lens 20, and irradiates the front and back surfaces of the photographic plate X at incident angles θ ₁ and θ _{2 ,} respectively.

[0014] Also, instead of the above-mentioned θ ₂ , non-specular reflection angles θ _{3, 4, 5,... n} are set, and the laser light is repeatedly irradiated on the front and back of the photographic plate X at each set angle. By multiple exposure, a plurality of Lippmann-type hologram patterns with interference fringes layered in the thickness direction of the emulsion layer of the photographic plate X are recorded. Then, a non-specular reflection multiple exposure hologram plate 3 is formed by performing a development process or the like.

With the above configuration, the non-specular reflection multiple exposure hologram plate 3 performs non-specular reflection according to the Bragg reflection conditions and has wavelength selectivity, and the non-specular reflection multiple exposure hologram plate 3 performs Bragg reflection. The outside light is narrowed down to wavelengths that are approximately the same as the selected wavelength, and furthermore, this narrowed down outside light is separated and Bragg-reflected at non-specular reflection angles of θ _{2, 3, 4, 5,...n.} As a result, the amount of external light incident on the display surface 12a of the display device 12 is further reduced, and washout of the display can be prevented. Therefore, the driver can clearly see the virtual image 16 at a distance.

[0016] Note that the reflective surface for viewing the virtual image 16 is the inner surface of the windshield 14 itself. Not limited to, reflective treatment surfaces on the inner surface and half mirrors placed on the dashboard 11 But that's fine.

[0017]

[Effect of the idea]

As explained above, according to the present invention, external light incident on the non-specular reflection hologram plate is Depending on the non-specular reflection angle of the multiple hologram patterns of the non-specular reflection hologram plate. The light from the outside that is incident on the display surface of the display device is split and reflected by Bragg. The amount is reduced, and display washout can be prevented.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of a vehicle display device according to the present invention.

FIG. 2 is a partially enlarged view of FIG. 1;

FIG. 3 is an explanatory diagram of a method for manufacturing the hologram in FIG. 1;

FIG. 4 is a diagram showing an example of a conventional vehicle display device.

[Explanation of symbols]

11 Dashboard 12 Display 3 Non-specular reflection multiple exposure hologram plate 14 Windshield

Claims (1)

[Scope of utility model registration request] Claim 1: A display image of a display device disposed on a dashboard that is non-specularly reflected by a non-specular reflection hologram plate is reflected toward the driver's seat by a reflective surface arranged within the field of vision in front of the driver's seat. In a vehicle display device in which a display image can be visually recognized within a field of view of a windshield, the non-specular reflection hologram plate includes a plurality of hologram patterns each having a different non-specular reflection angle. Display device.