JPH1096792A - Hologram liquid crystal display timepiece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve visibility and decorativeness by arranging a reflection type diffusion hologram layer on the reverse of a liquid crystal panel, and avoiding the regularly reflected light by providing a shaft dislocating function. SOLUTION: An interfacial reflection preventive refractive index adjusting liquid 2 is interposed in the reverse of a liquid crystal panel l, and a reflection type diffusion hologram layer 3 is arranged. In the liquid crystal panel l, electrode layers 1b and 1d are formed on both surfaces of a liquid crystal layer 1c, and polarizing plates 1a and 1e are arrangecl on its outside. When voltage is impressed between the electrode layers 1b and 1d, for example, a figure part becomes light-transmissive, and time is displayed by the reflected diffracted light from the hologram layer 3. The hologram layer 3 is made rotatable, and the direction of directivity of the reflected diffracted light is made selectable, and it can be observed by avoiding the regularly reflected light of the environmental light. Even if a transmission type diffusion hologram layer is arranged on a surface of the liquid crystal panel 1 and a mirror surface reflecting plate is arranged on the reverse, a similar effect is obtained. Therefore, visibility is improved by avoiding the regularly reflected light, and since a pattern is recorded on the hologram layer 3, decorativeness can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display timepiece, and more particularly to a hologram liquid crystal display timepiece using a hologram to enhance visibility and decorativeness.

[0002]

2. Description of the Related Art Liquid crystals are used for displaying various clocks such as watches and clocks. A liquid crystal display watch has a module in which polarizers are placed on both sides of a liquid crystal layer with electrodes formed on both sides and a reflective layer is formed on the back in a watch case. A variety of digital displays, analog displays, or a combination of both displays the time by changing the orientation of the layers are commercially available.

[0003]

The liquid crystal display timepiece consumes less power and has a long life because it has no moving parts. However, the viewing angle is narrow, and specularly reflected light from the timepiece surface overlaps the time display image. There are problems such as insufficient visibility. In addition, the watch is required to have decorative properties, and in the conventional liquid crystal display watch, it is necessary to draw a picture on the dial or to apply a pattern by processing the surface of the reflective layer. Things tended to be difficult and monotonous, and not always enough.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a hologram liquid crystal display timepiece capable of improving visibility and decorativeness.

[0005]

According to the present invention, a reflection type diffusion hologram layer is arranged on the back side of a liquid crystal panel, or a transmission type diffusion hologram layer is arranged on the front side of a liquid crystal panel and a reflection layer is arranged on the back side. The reflection type diffusion hologram layer and the transmission type diffusion hologram layer are provided with an axis shifting function for avoiding specular reflection light.

[0006]

Embodiments of the present invention will be described below. A first embodiment of a hologram liquid crystal display timepiece according to the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing a hologram liquid crystal display timepiece according to a first embodiment. FIG. 1 (a) is a cross-sectional view, FIG. 1 (b) is a diagram illustrating a layer configuration of a liquid crystal panel, and FIG. FIG. 2 is a plan view, FIG. 2 is a diagram for explaining a method of manufacturing a reflection type diffusion hologram, and FIG. 3 is a diagram for explaining directivity of the reflection type diffusion hologram. As shown in FIG. 1 (a), the hologram liquid crystal display timepiece has a reflection type diffusion hologram 3 laminated on a back surface of a liquid crystal panel 1 with a refractive index matching liquid 2 interposed therebetween to prevent reflection at an interface. is there. As shown in FIG. 1B, the liquid crystal panel 1 has electrode layers 1b and 1d formed on both surfaces of a liquid crystal layer 1c.
This is a structure in which polarizing plates 1a and 1e are arranged outside the electrode layers. When a voltage is applied between the electrode layers, for example, as shown in FIG. The time is displayed by the reflected and diffracted light from the diffusion hologram 3. Further, when a voltage is applied between the electrode layers, the time may be displayed such that the region other than the numeral portion becomes light transmissive. If you record
As shown in FIG. 1C, a logo mark M is also observed. Note that such a logo mark may be multiplex-recorded on the reflection type diffusion hologram 3 or may be separately recorded and laminated.

In the reflection type diffusion hologram 3, as shown in FIG. 2, a reflection diffusion plate (scattering plate) 4 and a photosensitive material 3 are arranged at a predetermined interval, and the reflection diffusion plate 4 is irradiated with incident light 5. FIG. 3 is a diagram in which the reflected and diffused light (scattered light) 6 is applied to the back surface of the photosensitive material 3 and the reference light 7 is applied to the surface of the photosensitive material 3 to record interference fringes between the diffused light and the reference light. As shown in FIG.
Is irradiated on the reflection type diffusion hologram 3, and the reflected diffraction light 8 corresponding to the directivity of the diffusion light 6 in FIG. 2 is reflected. Therefore, if the directivity of the diffused light 6 is set to be off-axis with respect to the reference light (the direction of the diffused light is shifted with respect to the specularly reflected light of the environmental light), the positiveness of the environmental light (reference light) is increased. Since the reflected light and the reflected diffracted light do not overlap, visibility can be improved. In this case, if the reflection type diffusion hologram 3 is made rotatable in the portion of the refractive index matching liquid 2 in FIG. 1A, the direction of the directivity of the reflected diffracted light can be selected. By rotating the reflection type diffusion hologram 3 according to the above, observation can be performed while avoiding specular reflection light of environmental light. In this case, if the rotation is performed by using the viscosity of the refractive index matching liquid 2, reflection at the interface between the liquid crystal panel and the reflective layer can be prevented, high visibility can be obtained, and smooth rotation can be performed.

Next, another embodiment of the present invention will be described with reference to FIGS. In this embodiment, as shown in FIG. 4, a liquid crystal panel 11 is arranged on the back surface of the transmission diffusion hologram 10, and a specular reflection plate 12 is arranged on the back surface of the liquid crystal panel 11. LCD panel 1
Reference numeral 1 denotes a layer structure similar to that described with reference to FIG. 1, in which a voltage is applied between the electrode layers to reflect the light from the specular reflector 12 through the liquid crystal portion which has become light transmissive, and the time is displayed. . The transmission diffusion hologram 10 is for giving a predetermined directivity. As shown in FIG. 5, the reference light 7 and light from the reflection diffusion plate (scattering plate) 4 are made incident on the same side of the photosensitive material 10. And the interference fringes are recorded. FIG.
As shown in (2), when the transmission diffusion hologram 10 is irradiated with environmental light (reference light 7), transmitted diffracted light is obtained in a direction that does not overlap with the direction of the environmental light. Therefore, the light emitted to the liquid crystal panel through the transmission type diffusion hologram 10 passes through the light transmitting portion of the liquid crystal panel, is reflected by the mirror reflector, passes through the light transmitting portion of the liquid crystal panel again, and passes through the transmission type diffusion hologram. 10 and is observed without overlapping with the specular reflection light of the environment light. In addition, it is reflected by the specular reflector,
Of the light that has passed through the light-transmitting portion of the liquid crystal panel again, light in the same direction as the reference light, or light in a direction conjugate to it, may be diffracted again by the transmission type diffusion hologram 10 to form a double image. Transmission diffusion hologram 10, liquid crystal panel 1
1. Because the specular reflectors are located very close,
Almost no effect. Also in this embodiment, since the transmission type diffusion hologram 10 is rotatable with respect to the liquid crystal panel, the direction of directivity can be selected according to the surrounding situation, so that the visibility is improved. Can be done. It should be noted that the field of view can be further widened by using a specular reflector as a diffuser, and a reflective diffusion hologram may be used instead of the specular reflector.

[0009]

As described above, according to the present invention, a reflection type diffusion hologram is arranged on the back surface of a liquid crystal panel, or a transmission type diffusion hologram is arranged on the surface of a liquid crystal panel, and specular reflection light of environmental light is applied to each hologram. Visibility can be improved by providing an axis shifting function to be avoided. Also,
By recording a logo mark, various patterns, and the like on the hologram, various decorative effects can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a hologram liquid crystal display timepiece according to a first embodiment.

FIG. 2 is a view for explaining a method of manufacturing a reflection type diffusion hologram.

FIG. 3 is a diagram illustrating the directivity of a reflection type diffusion hologram.

FIG. 4 is a diagram showing a hologram liquid crystal display timepiece according to another embodiment.

FIG. 5 is a diagram for explaining a method of manufacturing a transmission diffusion hologram.

FIG. 6 is a diagram illustrating the directivity of a transmission diffusion hologram.

[Explanation of symbols]

Reference numerals 1, 11: liquid crystal panel, 2: refractive index matching liquid, 3: reflection type diffusion hologram, 4: reflection scattering plate, 10: transmission type diffusion hologram, 12: specular reflection plate.

Claims (5)

[Claims] 1. A hologram liquid crystal display watch according to claim 1, wherein a reflection type diffusion hologram layer is disposed on the back side of the liquid crystal panel, and said reflection type diffusion hologram layer has an axis shifting function for avoiding specular reflection light. . 2. The timepiece according to claim 1, wherein the reflection type diffusion hologram layer is rotatable with respect to a liquid crystal panel. 3. A transmission diffusion hologram layer is disposed on a front surface side of a liquid crystal panel, and a reflection layer is disposed on a rear surface thereof. The transmission diffusion hologram layer has an axis shifting function for avoiding specularly reflected light. Hologram liquid crystal display clock. 4. The hologram liquid crystal display timepiece according to claim 3, wherein said transmission type diffusion hologram layer is rotatable with respect to a liquid crystal panel. 5. The diffusion hologram layer according to any one of claims 1 to 4, wherein a desired pattern is further multiplex-hologram-recorded or separately hologram-recorded and laminated. A hologram liquid crystal display clock characterized by the following.