JPH10161044A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device to which a sufficient light quantity may be applied and with which a flexible structure, weight reduction and cost reduction are possible without requiring the magnetic fluid of liquid. SOLUTION: The pixel display part of every one pixel is constituted to include a back light 8, a lens 7 for condensing its light, a shutter 5 arranged in the condensing part of this light, a thin type transparent coil 3 for driving this shutter 5 and a transmissive fluorescent surface 1 to be irradiated with the light transmitted through the shutter 5 and a coil 3. The shutter 5 is formed of an L-shaped film material. The film of a magnetostrictive material which is stretched by magnetic field is formed on one surface of the perpendicular surface and the film of a shrinkable magnetostrictive material on the other surface. The horizontal surface is formed as a shutter film. The shutter film receives the magnetic field by the coil 3 and its perpendicular surface curves and, therefore, the shutter film opens and the light arrives at the transmissive fluorescent surface 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, and more particularly, to a display device for displaying character information and image information input by an electronic device as a still image and a moving image.

[0002]

2. Description of the Related Art An example of this type of display device is disclosed in Japanese Patent Application Laid-Open No. Sho 64-55583. In this display device, one pixel is composed of a magnetic film having elasticity and a sheet coil for driving the magnetic film, and the magnetic film is stable in a concave or convex shape.

A hole-shaped shadow mask is provided outside the magnetic film, and external light enters through the hole and is scattered and reflected by the magnetic film. However, when the magnetic film is concave, light is blocked by the shadow mask. In this case, the surface brightness is lower than that in the case of the convex shape, whereby the contrast of the screen is expressed.

Another example is disclosed in Japanese Patent Application Laid-Open No. 4-219720. This display device comprises a magnetic fluid sealed in a light-transmitting member having a polarizing property and formed into a film, and a yoke core and a coil having an interval of several tens of microns for applying a magnetic field to the magnetic fluid.

Then, a magnetic field generated by a yoke core and a coil arranged for each pixel acts on a magnetic fluid to generate a magneto-optical effect having characteristics similar to liquid crystal.

Further, a general liquid crystal display device comprises a transparent electrode, liquid crystal sealed in a film shape, and a light-transmitting member having a polarizing property.

In this general liquid crystal display device, an optical effect of liquid crystal is generated by a voltage generated by a transparent electrode for each pixel, and light is turned on / off in combination with a polarizing translucent member to display a screen. It is to do.

[0008]

However, Japanese Unexamined Patent Publication No.
The technique disclosed in Japanese Patent No. 55583 is a method of generating a contrast by using reflection of a magnetic film in each pixel. Therefore, it is necessary to supply light from outside the magnetic film, that is, from outside.

Therefore, it is necessary to use natural light as a light source for external light, or to supply an artificial light source from the side of viewing the screen or from the side of the screen.

[0010] Therefore, in the case of natural light, the recognizability of the screen is reduced due to a decrease in the amount of light in the surroundings. However, there is a disadvantage that the recognition is reduced.

On the other hand, the technique disclosed in Japanese Patent Application Laid-Open No. 4-219720 is to linearly control the amount of transmitted light for each pixel using a magnetic field, but uses a liquid magnetic fluid. Therefore, it is necessary to provide a means for holding a fluid liquid in a uniform film and a means for preventing leakage or drying of the liquid.

Therefore, it is necessary to dispose a very uniform light transmitting member with a precise gap and to seal the magnetic fluid in the gap.

[0013] Therefore, in addition to the use of expensive materials and construction methods, the liquid crystal is sealed in a precise film form, so that it is difficult to make the screen structure flexible, curved, or lightweight. there were.

Further, a general liquid crystal display device is disclosed in
Since it is necessary to seal a liquid crystal in the same manner as in the technique disclosed in JP-A-219720,
There is the same drawback as the technique disclosed in Japanese Patent Application Laid-Open Publication No. H10-209,873.

SUMMARY OF THE INVENTION An object of the present invention is to provide a display device which can provide a sufficient amount of light, does not require a liquid magnetic fluid, and has a flexible structure, light weight and reduced cost.

[0016]

According to the present invention, there is provided a display apparatus for displaying a single image as an aggregate of a plurality of pixels, and a pixel display unit for displaying each of the pixels. A light-emitting means, a light-collecting means for condensing the light obtained by the light-emitting means, and a light-shielding means provided at a position where the light is condensed by the light-condensing means and receiving light from an external magnetic field to shield light. And a magnetic field applying means for applying the magnetic field to the light shielding means, and a display means for displaying light obtained through the light shielding means.

According to the present invention, the light is supplied by the light emitting means, the light is condensed by the light condensing means, the light condensing part is provided with a light shielding means made of a magnetostrictive material, and the light is shielded by the magnetic field applying means. Control means to transmit or block light.
Then, the transmitted light is displayed on the display means.

[0018]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an exploded perspective view of a pixel display unit of a display device according to the present invention.

A display device is configured as an aggregate of the pixel display units.

In FIG. 1, a pixel display portion is a transparent phosphor screen 1.
And the first shade (housing to block external light)
2, a thin transparent coil 3, a second shade 4, a shutter 5, a third shade 6, a condenser lens 7, and a backlight 8.

Then, these members are superimposed sequentially from the top in the order of the assigned numbers, and the pixel display portion is completed.

The transmissive phosphor screen 1 is composed of a phosphor and a translucent member colored in one of the three primary colors of white or light, and a translucent member. It becomes a bright point of one pixel constituting the screen.

The first to third shades 2, 4, and 6 prevent light from the backlight 8 from entering other adjacent pixels and the like, and also provide clearance for the operation of the shutter 5 and a condenser lens. The focal length and the ray trajectory are maintained.

The thin transparent coil 3 includes a transmission substrate for transmitting light and a coil provided on the transmission substrate.
Although the thin transparent coil is provided above the second shade 4 in the present embodiment, it may be provided below the third shade. Further, if it has a structure that does not hinder the light guided by the condenser lens 7 and can generate a magnetic field, it is not necessary that the light is actually transparent.

Further, since the thin transparent coil 3 is structured to transmit light, this coil can be provided on the optical path. This is because the thin transparent coil 3 needs to be provided above or below the shutter 5 due to the configuration of the shutter 5 described later.

The shutter 5 includes a magnetostrictive material. 2 is an external perspective view showing the operation of the shutter, FIG. 3 is a cross-sectional view of the shutter taken along line AA ', and FIG.
It is B 'sectional drawing.

The shutter 5 is formed using a light-impermeable elastic resin film such as a thin-film polyimide film as a base material, and a magnetostrictive material, such as amorphous Tb-
A magnetic field stretching material such as an Fe alloy is formed by a sputtering method or the like. On the other surface 5b of the drive unit, a magnetostrictive material that contracts due to a magnetic field, for example, a magnetic contraction material such as an amorphous Sm-Fe alloy is formed by a sputtering method or the like, like the one surface. Further, the above-described base material is used as it is for the shutter film portion 5c. However, cuts 5e are formed at regular intervals in the shutter film portion 5c to make it easy to bend.

Since the magnetostrictive materials 5a and 5b formed on the driving portion of the shutter 5 expand and contract due to the magnetic field generated by the thin transparent coil 3, the shutter film 5c does not cover the opening 5f ( The portion indicated by the broken line in FIG. 2 indicates the position of the shutter film portion 5c when no magnetic field is received, that is, a light-shielded state, and when a magnetic field is received, the shutter film portion 5c opens in the direction of arrow F). Light can pass through.

The magnetostrictive material 5 extends in the same direction as the optical path direction L.
The thin transparent coil 3 is provided above the shutter 5 in order to apply substantially the same amount of magnetic field to the magnetostrictive materials 5a and 5b since the drive section on which the films a and 5b are formed stands upright. A magnetic field is applied to the surfaces of the materials 5a and 5b.

Further, the magnetostrictive material 5 of the driving portion of the shutter 5
For a and 5b, in addition to forming a film only on the driving portion, a magnetostrictive material may be left only on the driving portion by etching or the like after forming a film on the entire surface by sputtering or the like.

Further, since the shutter 5 is made of a thin-film polyimide film or the like, a sheet-like material may be manufactured by stamping and molding in about one or two steps.

The condenser lens 7 is formed as a convex mirror, and is preferably made of an elastic transparent material such as resin. Of course, glass can be used as the material.

In the present embodiment, the backlight 8 is made of a surface-emitting material because it is necessary to provide a light source in an extremely narrow area of one element. For example, EL (Elect
(Ro Luminescence) plate. However,
The invention is not limited to this EL plate, and any other material may be used as long as it is a planar material that emits light when a voltage is applied.

Further, in addition to coloring the transmission phosphor screen 1 as described above, the thin transparent coil 3 may be colored with a transparent pigment or the like.

FIG. 5 is an assembly front view of the pixel display unit, and FIG. 6 is an assembly side view of the display unit. In the figure, the same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, the condenser lens 7 is covered by a fourth shade 9. In FIG. 1, this shade 9 is omitted. This is to make the exploded view of FIG. 1 easier to see.

The operation of the pixel display section will be described mainly with reference to FIGS.

FIGS. 5 and 6 show that the light beam P from the backlight 8 is condensed by the shutter film portion 5c of the shutter 5, and further passes through the shutter film portion 5c to reach the transmission fluorescent screen 1. Shows the case. That is, this shows a case where the shutter film portion 5c is open.

First, when no voltage is applied to the thin transparent coil 3, no magnetic field is generated by the thin transparent coil 3.
Accordingly, no magnetic field is applied to the shutter 5, and the driving portion of the shutter 5 does not bend. Therefore, the light path L is blocked by the shutter film portion 5c of the shutter 5 (the shutter film portion 5c is closed), so that light from the backlight 8 does not reach the transmission fluorescent screen 1.

On the other hand, when a voltage is applied to the thin transparent coil 3, a magnetic field is generated by the thin transparent coil 3. Accordingly, a magnetic field is applied to the shutter 5, and the driving portion of the shutter 5 is curved. Therefore, the optical path L is opened from the shutter film portion 5c of the shutter 5 (the shutter film portion 5c).
c is opened), the light from the backlight 8 reaches the transmission phosphor screen 1.

Next, the configuration of a display device configured as an aggregate of pixel display units will be described. FIG. 7 is an exploded perspective view of the display device.

This is one in which the pixel display units shown in FIG. 1 are arranged in an array. That is, the transparent phosphor screen 1, the shades 2, 4, and 6, the transparent coil 3, the shutter 5,
The condenser lens 7, the backlight 8, and the shade 9 shown in FIGS. 5 and 6 are each formed in a sheet shape and are superimposed with high precision by bonding or other methods.

Further, by forming each component into a sheet shape, each component can be formed into various curved shapes according to the display form of the screen and the shape of the mounting portion of the display device.

Further, since the material of the shutter 5 is basically an elastic material (elastic resin film), a display device having a flexible structure can be obtained by forming all or a part of each of the other components with an elastic material. It can be created.

[0045]

According to the present invention, there is provided a display device for displaying one image as an aggregate of a plurality of pixels,
A pixel display unit that displays each of the pixels, a light emitting unit,
A light condensing means for condensing the light obtained by the light emitting means, a light shielding means provided at a position where the light is condensed by the light condensing means and receiving light from an external magnetic field, and a light shielding means; Since it is configured to include the magnetic field applying means for applying the magnetic field and the display means for displaying the light obtained through the light shielding means, it is possible to provide a sufficient amount of light, and does not require a liquid magnetic fluid, and is flexible. It is possible to provide a display device capable of reducing the structure, weight, and cost.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a pixel display unit of a display device according to the present invention.

FIG. 2 is an external perspective view showing an operation of a shutter of the display device.

FIG. 3 is a sectional view taken along line AA ′ of the shutter.

FIG. 4 is a sectional view taken along line BB 'of the shutter.

FIG. 5 is an assembled front view of a pixel display unit of the display device according to the present invention.

FIG. 6 is an assembled side view of the pixel display unit.

FIG. 7 is an exploded perspective view of a display device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transmission fluorescent screen 2 3 Thin transparent coil 5 Shutter 5a, 5b Magnetostrictive material 7 Condensing lens 8 Backlight

Claims (8)

[Claims] 1. A display device that displays one image as an aggregate of a plurality of pixels, wherein a pixel display unit that displays each of the pixels includes a light emitting unit,
A light condensing means for condensing the light obtained by the light emitting means, a light shielding means provided at a position where the light is condensed by the light condensing means and receiving light from an external magnetic field, and a light shielding means; A display device comprising: a magnetic field applying means for applying the magnetic field; and a display means for displaying light obtained through the light shielding means. 2. A light-shielding member driven by the drive member, wherein the light-shielding means has a material that expands by receiving the magnetic field on one surface and a material that shrinks by receiving the magnetic field on another surface. The display device according to claim 1, wherein the display device comprises: 3. The display device according to claim 2, wherein a surface of the light blocking member is formed in a direction perpendicular to a surface of the driving member, and the surfaces of both members are continuous. 4. The display device according to claim 1, wherein said magnetic field applying means comprises a transmission substrate for transmitting said light, and a coil provided on said transmission substrate. 5. The display device according to claim 4, wherein the magnetic field applying means is provided on an optical path of the light. 6. The display device according to claim 1, wherein said light emitting means is made of a surface light emitting material. 7. A display device according to claim 1, wherein a display surface of said display means is made of a fluorescent material colored in one of the three primary colors of white or light or another color and a light transmitting member.
The display device according to any one of the above. 8. The display device according to claim 1, wherein each of the units constituting the pixel display unit is connected in a sheet shape by the number of pixels.