JPS6385686A - Display device - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a display device using a dry plate on which a hologram is recorded.

(Prior Art) In general, displays using holograms are not only innovative because the displayed contents appear three-dimensional, but also have the advantage that since holograms are a type of photograph, they can clearly reproduce even the details of the image.

There are two types of holograms: transmissive and reflective. Transmission-type holograms use a laser beam to record the reflected light from the subject on a dry plate at the time of withdrawal, and at the same time, at the time of reproduction, the reproduction light is irradiated from the back side of the dry plate so that a virtual image (or real (!i)) can be seen. Therefore, a laser light source is mainly required as the reproduction light.

On the other hand, a reflection type hologram (Lippmann hologram) reproduces an image by shining light onto the dry plate from the same side as the direction in which it is viewed during reproduction, and when it is reproduced, coherent 1- light such as a laser light source is emitted. Although necessary, a three-dimensional image can also be reproduced by using a general light source from the laser beam irradiation direction during reproduction during reproduction. That is, a reflection type hologram can use a general light source during reproduction.

Since the information recorded in such a hologram is a still image, the displayed content is also a still image, and the displayed content cannot be changed like a normal display. For this reason, conventional displays using holograms have been static image displays for decoration or advertising.

(Problems to be Solved by the Invention) As described above, conventional display devices using holograms only display still images, and cannot perform dynamic displays such as changing numerical values from rOJ to "9". was there.

This invention was made to solve these problems, and by variably controlling the light area irradiated onto the hologram recording surface, the reproduced image can be changed, and a three-dimensional display with switchable display can be created. The aim is to provide a display device.

[Structure of the Invention] (Means for Solving the Problems) The present invention includes a dry plate on which a hologram is recorded, a light source that irradiates light onto the hologram recording surface of the dry plate, and an electrical signal from the light source to the hologram recording surface of the dry plate. An optical shutter array is provided to variably control the light area irradiated to the display, and display switching is performed by variably controlling the irradiated light area by the optical shutter array.

(Function) In the present invention having such a configuration, the light area irradiated from the light source to the hologram recording surface of the dry plate through the optical shutter array is variably controlled by changing the electric signal, so that the hologram recording surface of the dry plate is variably controlled. It is possible to control not to display part of a still image, and this makes it possible to switch the display.

(Example> An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing the external appearance, and numeral 1 is a dry plate formed by forming an emulsion surface 3 on the surface of a glass substrate 2 on which a hologram is recorded.

An optical shutter array 4 is provided overlappingly on the emulsion surface 3 of this dry plate 1. The optical shutter array 4 is made of a PLZT ceramic plate, and transparent M145.6 made of the same PLZT ceramic is laminated on both sides. The optical shutter array 4 is divided into a plurality of parts in a matrix, and control terminals 7 and 8 for controlling each divided part are provided at the negative end of the array so as to face each other. For example, the control terminal 7 is provided with signal lines that control the vertical rows of each divided piece, and the control terminal 8 is provided with signal lines that control the horizontal rows of each divided piece.

The display device constructed in this manner is installed as shown in FIG. 2, and the recording surface of the dry plate 1 is irradiated with light from the light a9 through the optical shutter array 4. Then, a control electrical signal is input to the control terminal 7° 8 of the optical shutter array 4, and the refractive index of each divided piece in a matrix is selectively changed, so that light is irradiated from the light source 9 onto the recording surface of the dry plate 1. Variable control of area. For example, as shown in FIG.
'' is recorded, the optical shutter array 4 is controlled so that the light is not irradiated on a part of that value, and the reproduced image displays the numerical value "7" as shown in FIG. 4, for example. Variable so that By doing this, it becomes possible to display the number 11rOJ to "9". Therefore, for example, r88 on the recording surface of dry plate 1:
If the information 88J is recorded, it becomes possible to display the time that changes moment by moment depending on the signal input to the control terminal 7.8.

Using holograms that record still images in this way, it is possible to display dynamically changing three-dimensional images.

Next, another embodiment of the invention will be described with reference to the drawings.

It should be noted that the same parts as in the previous embodiment are given the same reference numerals and detailed explanations will be omitted.

This involves separating the dry plate 1' and the optical shutter array 4' as shown in FIG.
In front of the hologram recording surface of 1', the light area irradiated from the light source 9 to the recording surface can be variably controlled, and the hologram 1' is placed in a position that is not blocked from light in the direction in which the reproduced image from the dry plate 1' is viewed. For example, when the dry plate 1 is set upright and the light source 9 is installed diagonally above the recording surface of the dry plate 1, the optical shutter array 4 is placed above the dry plate 1 so as to be substantially perpendicular to the dry plate 1.
That is, it is sufficient to arrange it approximately horizontally so that the reproduced image can be viewed from approximately in front of the recording surface of the dry plate 1.

In this device as well, the light reaching the recording surface of the dry plate 1 from the light source 9 is controlled by selectively controlling each divided piece of the optical shutter array 4 by a control signal from the control terminal 7.8 to change its refractive index. Light can be selectively blocked and the light area irradiated onto the recording surface can be varied.

Therefore, as in the previous embodiment, the three-dimensional structure (
It becomes possible to display the kame.

Note that in the above embodiment, PLZ is used as the optical shutter array.
Although a structure made of T-ceramics has been described, it is not necessarily limited thereto, and may be made of, for example, a liquid crystal or a photochromic element.

[Effects of the Invention] As detailed above, according to the present invention, a display device capable of changing the reproduced image by variably controlling the light area irradiated onto the hologram recording surface and capable of displaying stereoscopic display with display switching is provided. It is possible to provide

[Brief explanation of the drawing]

Figures 1 to 4 show an example of a factory according to the present invention. Figure 1 is a perspective view showing the external appearance, Figure 2 is a perspective view showing the operating state, and Figures 3 and 4. 5 is a diagram for explaining display changes, and FIG. 5 is a perspective view showing another embodiment of the present invention. 1... Dry plate, 4... Optical shutter array, 9...
light source. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 3 Figure 4 Figure 5

Claims (3)

[Claims] (1) A dry plate on which a hologram is recorded, a light source that irradiates light onto the hologram recording surface of the dry plate, and an optical shutter array that variably controls the light area irradiated from the light source to the hologram recording surface of the dry plate using electrical signals. A display device characterized in that the display is switched by variable control of the irradiated light area by the optical shutter array. (2) A display device according to claim 1, characterized in that an optical shutter array is provided overlapping a hologram recording surface of a dry plate. (3) An optical shutter array is arranged in front of the hologram recording surface of the dry plate so as to block only the light from the light source, but not to block light in the direction in which the reproduced image from the dry plate is viewed. Display device according to scope 1.