JPH06111779A - Flat light source and image display device - Google Patents

Abstract

PURPOSE:To use electrons emitted from an electrode effectively and reduce the cost through decreasing of light source by using a flat light source consisting of two glass sheets whose inner surface fluorescent film is provided to the back-light for a left and a right liquid crystal panel. CONSTITUTION:A sheet-form light source 15 is so structured that fluorescent films 10a, 10b are provided over the inner surfaces of a front glass sheet 6 and a rear glass sheet 7, and electrons emitted from a discharge electrode 9 put the two fluorescent films luminous with a high brightness. With a three- dimensional image display device using this flat light source 15 as the back-light, the lights emitted from the fluorescent films 10a, 10b serve as back-light for liquid crystal panels 4a, 4b for the left and the right eye, which 1a, 1b can give the enlarged virtual image of the object through reflection plates 11a, 11b and eyepiece lenses 2a, 2b, and the person observing can have a three- dimensional image. Because one light source 15 serves as serves as back-light for two liquid crystal panels, the costs are suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat light source used for a backlight of a liquid crystal display and a binocular image display device such as a stereoscopic television using the flat light source as a backlight.

[0002]

2. Description of the Related Art Conventionally, as this type of image display device,
For example, there is a stereoscopic image display device as disclosed in Japanese Patent Laid-Open No. 3-292091.

FIG. 3 is a plan view showing a schematic structure of a conventional stereoscopic image display device.

In the figure, reference numerals 2a and 2b denote a pair of left and right eyepieces (optical systems) made up of respective convex lenses, and behind the eyepieces 2a and 2b (on the side opposite to the observer), respectively.
A pair of left and right transmissive liquid crystal displays 3a and 3b are provided. The liquid crystal displays 3a and 3b are each a liquid crystal panel 4a that displays an image by driving a liquid crystal,
4b and the plane light source 5 which functions as a backlight. The images displayed on the liquid crystal panels 4a and 4b of the liquid crystal displays 3a and 3b are magnified far by the eyepieces 2a and 2b, and become a virtual image on a virtual screen behind the liquid crystal displays 3a and 3b. Are recognized by the left and right eyes 1a and 1b. Different images are displayed on the left and right liquid crystal panels 4a and 4b, and the observer can see the perspective by the binocular parallax effect obtained from the difference between the images displayed on the left and right eyes 1a and 1b. I feel a sense.

FIG. 4 is a schematic sectional view of the flat light source 5 functioning as a backlight.

In the figure, 6 is a front glass, 7 is a rear glass,
Reference numeral 8 denotes a frame glass, which forms a flat glass container. A discharge electrode 9 is installed in this glass container. A fluorescent film 10 is formed on the inner surface of the front glass 6. The electrons emitted from the discharge electrode 9 reach the fluorescent film 10 to which a high voltage is applied and excite the fluorescent film 10 to emit light with high brightness.

However, in the flat light source having the above structure,
Of the electrons emitted from the discharge electrode 9, only the electrons emitted to the front glass 6 side are useful for the light emission of the fluorescent film 10, and the electrons emitted to the rear glass 7 side are completely useless and useless. There is a problem of consumption. Moreover, in the above-described conventional stereoscopic image display device, it is necessary to use the flat light source 5 having the above-described structure that functions as a backlight for each of the left and right liquid crystal displays 3a and 3b. There is also the problem of becoming.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above drawbacks of the prior art, and an object thereof is to provide a flat light source in which the waste of electrons emitted from the discharge electrode is reduced. is there.

It is another object of the present invention to provide an image display device which is advantageous in terms of cost, by using the above-mentioned flat light source to reduce the number of necessary flat light sources.

[0010]

The flat light source of the present invention comprises a glass container composed of a front glass, a rear glass and a frame glass, and a discharge electrode is provided inside the glass container. Also, a fluorescent film is formed on each of the inner surface of the back glass.

Further, the image display device of the present invention forms a double-sided emission type flat light source that emits light from both the front glass side and the back glass side, and the front glass and the back glass of the flat light source have outer surfaces respectively. , A liquid crystal display having a pair of left and right liquid crystal panels attached, a reflector for changing the orientation of one or both of the images on the liquid crystal panel of the left and right pairs, and a pair of the left and right pairs. It is characterized by having a pair of left and right lens systems for forming images of liquid crystal panels as enlarged virtual images, respectively.

[0012]

In the above-mentioned flat light source, the electrons emitted from the discharge electrode to the front glass side are useful for the light emission of the fluorescent film formed on the inner surface of the front glass, and the electrons emitted from the discharge electrode to the rear glass side are on the back side. It is useful for light emission of the fluorescent film formed on the inner surface of the glass.

Further, in the image display device having the above-mentioned structure, the light emission on the front glass side and the light emission on the rear glass side of the flat light source respectively function as a backlight for a pair of left and right liquid crystal displays.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a plan view showing a schematic structure of the stereoscopic image display apparatus of this embodiment. The same parts as those in FIG. 3 are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, 11a and 11b are reflectors arranged behind the left and right eyepieces 2a and 2b, respectively.
The eyepieces 2a and 2b are inclined by 45 ° with respect to the optical axes 12a and 12b. 14 is the reflectors 11a, 11
It is located between b and the optical axis 12 by the reflectors 11a and 11b.
It is a liquid crystal display for both left and right, which is arranged so as to be orthogonal to the optical axes 13a and 13b which are turned in a direction orthogonal to a and 12b. The liquid crystal display 1
Reference numeral 4 denotes a two-sided light emitting flat light source 15 that functions as a backlight, a left-eye liquid crystal panel 4a attached to the outer surface of the front glass 6 located on the reflecting plate 11a side of the flat light source 15, and the flat light source 15 And a liquid crystal panel 4b for the right eye attached to the outer surface of the back glass 7 located on the side of the reflection plate 11b.

FIG. 2 is a schematic cross-sectional view of the above-mentioned flat light source 15 which emits light from both sides and functions as a backlight. The same parts as those in FIG. 4 are designated by the same reference numerals, and the description thereof will be omitted.

This dual-sided flat light source 15 has a fluorescent film 10a formed on the inner surface of the front glass 6, and a fluorescent film 10b formed on the inner surface of the rear glass 7. That is,
In the flat light source 15, the electrons emitted from the discharge electrode 9 to the front glass 6 side reach the fluorescent film 10a formed on the inner surface of the front glass 6 and are excited by exciting the fluorescent film 10a. Make it emit light with brightness. Further, the electrons emitted from the discharge electrode 9 toward the rear glass 7 reach the fluorescent film 10b formed on the inner surface of the rear glass 7, and the fluorescent film 10b.
By exciting b, light is emitted with high brightness.

In the stereoscopic image display device of the present embodiment using the above-mentioned two-sided light emitting flat light source 15 as a backlight, the light emission from the fluorescent film 10a formed on the inner surface of the front glass 6 is the liquid crystal panel for the left eye. 4a, which serves as a backlight for the observer's left eye 1a and an eyepiece 2a and a reflector 11
An enlarged virtual image of the image on the liquid crystal panel 4a is recognized via a. In addition, the fluorescent film 10 formed on the inner surface of the rear glass 7
The light emitted from b acts as a backlight of the liquid crystal panel 4b for the right eye, and the right eye 1b of the observer has an eyepiece 2b,
The enlarged virtual image of the image on the liquid crystal panel 4b is recognized through the reflection plate 11b.

As described above, in the flat light source 15, the electrons emitted not only to the front glass 6 side but also to the rear glass 7 side are useful for the light emission of the fluorescent film 10b, and the electrons emitted from the discharge electrode 9 are not emitted. It can be used effectively.

Further, in the stereoscopic image display device of the present embodiment using the flat light source 15, the fluorescent film 10 on the front glass 6 side.
The light emission of a functions as a backlight of the liquid crystal panel 4a for the left eye, and the light emission of the fluorescent film 10b on the back glass 7 side functions as a backlight of the liquid crystal panel 4b for the right eye.
Flat light source 1 required for the left and right liquid crystal panels 4a and 4b
Five is enough, and the number of plane light sources can be reduced. Moreover,
The stereoscopic image display device of the present embodiment can reduce the space only in the area shown by the shaded portion 16 in FIG. 1 as compared with the conventional stereoscopic image display device shown in FIG. 3, and is also suitable for reduction in size and weight. In this embodiment, the left and right optical path lengths are the same, and the observer can recognize the left and right images in good balance.

In the above embodiment, the flat light source 15 is arranged so that the front glass 6 is on the left eye side and the back glass 7 is on the right eye side, but the flat light source 15 is arranged in the opposite direction. Even if they are arranged, the same effect as that of the above embodiment can be obtained.

The position of the reflector is not limited to that of the above embodiment, and the left and right optical path lengths are different, but a plurality of reflectors may be arranged only in one of the left and right optical paths. good. Further, the left and right eyepieces may be composed of a plurality of convex lenses.

[0024]

According to the present invention, it is possible to provide a flat light source capable of effectively utilizing the electrons emitted from the discharge electrode.

Further, according to the present invention, since one flat light source functions as a backlight for both the left and right liquid crystal panels, the number of necessary flat light sources can be reduced and a cost-effective image display device can be obtained. Can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a stereoscopic image display device of the present invention.

FIG. 2 is a plan view showing a configuration of a stereoscopic image display device of the present invention.

FIG. 3 is a perspective view showing a configuration of a conventional stereoscopic image display device.

FIG. 4 is a plan view showing a configuration of a conventional stereoscopic image display device.

[Explanation of sign]

 1a, 1b Left and right eyes 2a, 2b Eyepieces (lens system) 4a, 4b Liquid crystal panel 6 Front glass 7 Rear glass 10a, 10b Fluorescent film 11a, 11b Reflector 14 Liquid crystal display 15 Planar light source

Claims (2)

[Claims] 1. A flat light source comprising a front glass, a back glass and a frame glass, the flat glass light source having a discharge electrode inside the glass container, wherein the inner surface of each of the front glass and the back glass is covered with a glass. A flat light source having a light film formed thereon. 2. A double-sided emission type flat light source that emits light from both the front glass side and the back glass side is formed, and the left and right outer surfaces of the front glass and the back glass of the flat light source are respectively formed.
A liquid crystal display formed by attaching a pair of liquid crystal panels on the right, a reflector for changing the orientation of at least one of the images on the pair of left and right liquid crystal panels, and an image on the pair of left and right liquid crystal panels. An image display device having a pair of left and right lens systems that form respective magnified virtual images.