JPH05100318A - Fiber array display - Google Patents

Abstract

PURPOSE:To obtain a fiber array display enhanced in brightness, excellent in visibility and capable of moving the unmagnified, magnified and contracted picture on a screen by using a fiber plate as a transmissive screen on which the picture is projected and combining the plate and a lens system. CONSTITUTION:A sufficiently fine picture element is arranged for a picture to be displayed, light is emitted from the picture element or transmitted through the picture element to form a picture by the display main body. The display is constituted of the main body, i.e., a liq. crystal display panel 3, an image transmitting fiber plate 1 obtained by laminating plural step index-type optical fiber 7 having a sufficiently small diameter for the picture to be displayed in plural layers and a lens system 2 to form the picture on the panel 3 on the plate 1 surface. Since the plate 1 is formed in such a manner the inverted image of the panel 3 formed on the surface 1-b is not magnified and transmitted to the surface 1-a, and the image is observed by an observer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display used in automobiles, electronic devices and the like.

[0002]

2. Description of the Related Art A display for forming and displaying an image by arranging fine pixels such as CRT, liquid crystal, LED, and plasma and emitting or transmitting light is used in various fields such as indoor display of automobiles and electronic equipment. However, most of these displays are used by an observer to directly observe the pixel surface.

Since the depth of the display body of liquid crystal and LED displays can be made smaller than that of CRTs,
Although the range of use is expanding in recent years, in each display, as shown in FIG. 5, there is a blank space 1 around the image display surface 9.
Since 0 is required, it is difficult to effectively use the display surface.

Also, by combining these displays with a lens system, it is possible to enlarge or reduce the image, and it has been put to practical use as a projection type display. It is projected on the screen and the light reflected from the screen is observed. When observing a magnified or reduced image with transmitted light, it is possible to use frosted glass as a transmissive screen, but since the diffused image on the frosted glass surface is observed, the brightness of the image decreases. However, the visibility is significantly deteriorated.

[0005]

SUMMARY OF THE INVENTION As described above, an object of the present invention is to provide a transmissive screen for displaying an image on a display by forming the image on the transmissive screen in the same size or in a magnified or reduced size using a lens system. The present invention intends to provide a transmissive display having high brightness and excellent visibility by suppressing a decrease in brightness due to diffusion of light.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and by arranging sufficiently fine pixels for an image to be displayed and emitting or transmitting the light. A display body that forms an image, a fiber plate for image transmission in which a plurality of step index type optical fibers having a fiber diameter that is sufficiently small for the image to be displayed are laminated, and an image of the display body is formed on the fiber plate surface. The present invention provides a fiber array display composed of a lens system.

The present invention will be described below with reference to examples.
However, the present invention is not limited to this embodiment.
FIG. 1 is a structural example of the present invention, in which 1 is a fiber plate,
Reference numeral 2 is a Fresnel lens, and 3 is a liquid crystal display panel. The fiber plate 1 is an image transmission plate in which a plurality of step index type optical fibers having a diameter sufficiently small for a pixel for forming an image to be displayed are arranged and laminated,
The reverse image of the liquid crystal display panel formed on the 1-b plane is set to 1 at the same magnification.
-Transmit to side a. The observer observes the image of the liquid crystal display panel transmitted to the 1-a plane through the Fresnel lens and the fiber plate.

In the present invention, the fiber plate functions as a transmissive screen for displaying an image on the image display panel. FIG. 2 shows the case where a fiber plate is used as the screen, and FIG. 3 shows the case where the ground glass is used. When the ground glass 6 is used as the screen, the light incident on the ground glass surface is diffused on the ground surface, and the observer observes the diffused image on the ground surface, which causes blurring of the image and the transmission from the ground glass surface. Since the amount of light is also reduced, it is very difficult to transmit a high quality image.

On the other hand, the fiber plate 4 is an assembly of step index type optical fibers 7 in which a core for transmitting light and a clad layer having a refractive index lower than that of the core are arranged around the core, and the refraction of the core and the clad is performed. Light incident at an angle within the aperture angle determined by the ratio is repeatedly totally reflected at the interface between the core and the clad, propagates without loss, and exits from the reflecting surface, so that image transmission with high transmittance is possible. However, the light incident on the fiber plate at an angle equal to or larger than the opening angle of the optical fiber propagates across a plurality of optical fibers without being totally reflected at the interface between the core and the clad, and deteriorates the image resolution. It is desirable to make the aperture angle of the fiber plate larger than the aperture angle of the lens system for forming an image on the fiber plate so that light having an angle larger than the aperture angle of the fiber plate does not enter the fiber plate.

Further, as shown in FIG. 4, in order to correct the blur of the image due to the aberration of the lens system, it is possible to process the image plane of the fiber plate into a curved surface so that the plate surface and the focal plane can be exactly coincident with each other. . Normally, the lens system has a property that the periphery of the optical axis is darker than the center of the optical axis according to the COS4 law. However, by increasing the core occupation area of the fiber plate in the periphery of the center of the optical axis, it is possible to obtain an image with less uneven light amount. It is possible.

[0011]

Embodiment 1 In the embodiment of FIG. 1, reference numeral 1 is a fiber plate having a diameter 25 made of a multi-component glass material on the entire surface.
Step-index type optical fibers 7 of μm are arranged and laminated. Both end faces are mirror-polished. The numerical aperture of the optical fiber is 0.88 (opening angle 61.6 °), and the size of the plate is 118 × 82 × thickness 1 mm. Center part 5 of the plate to correct the uneven brightness of the lens system
The core occupation area of 0 × 40 mm was 65%, and the core occupation area of the peripheral portion was 72%.

Reference numeral 2 denotes a Fresnel lens for forming a 1 × inverted image on the surface b of the fiber plate 1, having a focal length of 100 mm and a numerical aperture of 0.85. 3 is a liquid crystal three-color display panel body, the number of dots is 160 × 128, the display area is 118 × 82 mm, and the external dimensions are 150 × 104 m.
m. 118 × 8 when directly observing the liquid crystal panel
While it is necessary to secure a display space of 150 × 104 mm for the display area of 2 mm on the display surface, the fiber plate is used as the display screen so that the display surface has only the space for the actual display area. It suffices to secure it, and it has become possible to save space on the display surface.

[0013]

INDUSTRIAL APPLICABILITY The present invention uses a fiber plate as a transmissive screen for displaying an image and combines it with a lens system, and has high brightness and excellent visibility, which makes it possible to achieve high-efficiency equal magnification or magnification. It became possible to move the image plane for reduction. Further, the fiber array display of the present invention, by adjusting the numerical aperture of the fiber plate, the core occupying area, processing the curved surface of the end surface, the aberration of the lens system,
Higher image quality can be achieved by correcting uneven brightness. Further, the fiber array display of the present invention is characterized in that the use thereof makes it possible to remarkably improve the degree of freedom in designing the display device such as effective use of the image display space.

[Brief description of drawings]

FIG. 1 is a perspective view of a configuration example of the present invention.

FIG. 2 is an explanatory diagram when a fiber plate is used as a transmission screen.

FIG. 3 is an explanatory diagram when ground glass is used as a transmission screen.

FIG. 4 is an explanatory diagram of a fiber plate in which an imaging surface is curved.

FIG. 5 is a front view of a liquid crystal display panel.

[Explanation of symbols]

 1,4 Fiber plate 2 Fresnel lens 3 Display body 5 Imaging lens 6 Frosted glass 7 Step index type optical fiber 8 Fiber plate with curved imaging plane 9 Effective display area 10 Undisplayable margin area

Claims (5)

[Claims] 1. A display main body for forming an image by arranging sufficiently fine pixels for an image to be displayed and transmitting or transmitting the pixels, and a step index having a fiber diameter sufficiently small for the image to be displayed. A fiber array display comprising: an image transmitting fiber plate in which a plurality of mold optical fibers are arranged and laminated; and a lens system for forming an image of the display body on the fiber plate surface. 2. The fiber array display according to claim 1, wherein the diameter of the optical fiber forming the fiber plate is smaller than the pitch of the pixels forming the display body. 3. The fiber array display according to claim 1, wherein the numerical aperture of the fiber plate is larger than that of the lens system. 4. The fiber array display according to claim 1, wherein the image forming surface of the fiber plate has a curved shape in order to correct the aberration of the lens system. 5. The area occupied by the fiber core in the peripheral portion of the fiber plate is made larger than that in the central portion in order to correct the decrease in the brightness of the peripheral portion due to the COS4 power law of the lens system. The fiber array display described.