JPH06196130A - Planar fluorescent lamp and liquid crystal display device - Google Patents

Abstract

PURPOSE:To improve utilization efficiency of the light of a planar fluorescent lamp by providing a planar fluorescent lamp, for which the utilization efficiency of the light of a white or multicolor source can be improved. CONSTITUTION:A microlens alley 14, in which microlenses 13 are provided in parallel to each other on the outside of a fluorescent screen, is provided for forming a planar fluorescent lamp. A microlens, in which minute lens for focusing the emission of the planar fluorescent lamp into an opening part of each picture element of a liquid crystal panel superimposed on the light outlet side, are provided in parallel to each other, is provided to form a liquid crystal display device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat fluorescent lamp and a liquid crystal display device.

[0002]

2. Description of the Related Art Recently, so-called liquid crystal video projectors using a liquid crystal panel as a light valve are commercially available. In this liquid crystal video projector, light from a lamp is converted into parallel rays by a reflector, separated into three primary colors by a dichroic mirror or prism, combined, and enlarged and projected by a projection lens.

At present, halogen lamps and metal halide lamps are used as the lamps, but the life is 1
Since it is only 00 to 2000 hours, there is a problem that the lamp needs to be replaced frequently in use.

Further, in this liquid crystal video projector, a dichroic mirror, a total reflection mirror, a prism,
There is also a problem in that an optical system including parts such as a lamp requires a large volume in terms of configuration, and the original characteristics of the liquid crystal panel, which is advantageous in achieving thinness and miniaturization, cannot be utilized.

In recent years, in order to solve these problems, a flat fluorescent lamp that excites a fluorescent substance by a high-speed electron beam, which is different from a conventional lamp, is used as a light source of a liquid crystal video projector.

This flat fluorescent lamp has a cathode panel 1 and a frame glass 2 as shown in a sectional view of FIG. 12, for example.
a front panel 3 arranged at a predetermined interval above the cathode panel 1 via a, 2b, and 2c, and the cathode panel 1, the frame glasses 2a to 2c, and the front panel 3 are sealed with a frit glass 4. Wear it as a vacuum container.

In this vacuum container, a line-shaped cathode 6 fixed to a predetermined height by a spring-shaped cathode erection post 5 is provided on the upper side of the cathode panel 1, and the upper surface of the cathode panel 1 is provided with a rear surface. An electrode 7 is provided, and also
The fluorescent layer 8 is provided on the lower surface of the front panel 3 so as to face them.
And an aluminum (Al) thin film 9 are formed.
A high voltage is supplied to the Al thin film 9 via the conductive lead 10 in order to accelerate electrons from the cathode 6.

Between the cathode 6 and the Al thin film 9,
The first grid 11 and the second grid 12 are provided, the trajectory of the electron beam emitted from the cathode 6 is corrected by the back electrode 7, and the amount supplied to the fluorescent layer 8 is controlled by the first grid 11. Also, the first on the second grid 12
A voltage lower than that of the Al thin film 9 is applied in order to enable cutoff at the grid. The electrons emitted from the cathode 6 and reaching the fluorescent layer 8 excite the phosphor to emit light.

By the way, since the light emitted from the fluorescent layer 8 is scattered light having a Lambertian distribution, much light is wasted because it cannot be captured by the projection lens arranged in the preceding stage of the liquid crystal panel of the liquid crystal video projector. Low utilization efficiency.

To solve this problem, for example, FIG.
It has been proposed to provide a multilayer interference filter 25 between the front panel 3 and the fluorescent layer 8 formed on one side of the front panel 3 to control the angle of the light emitted from the flat light source and amplify the light, as shown in FIG. .

Note that, in FIG. 13, the same reference numerals and names as in FIG. 12 are given to the respective portions common to FIG.

For example, when the phosphor is monochromatic green, if the characteristics as shown in FIG. 14 are given to the multilayer interference filter 25, light within a certain angle with respect to the normal line of the front panel 3 passes through the multilayer interference filter 25. However, light with an angle larger than that is reflected by the multilayer interference filter 25 and returns to the phosphor side again. The light returning to the phosphor side is scattered in the phosphor particles, a part of the light becomes light close to the vertical direction with respect to the multilayer interference filter 25 and passes to the outside, and the remaining part is the multilayer interference filter 25. It repeats being reflected again. As a result, the light output of the component perpendicular to the film is increased.

By the way, when the light source is a monochromatic tube such as R color, B color, and G color, as described above, the multilayer interference filter 2 is used.
Although it is possible to amplify the light in the normal direction by the action of 5, the light source of the liquid crystal panel for a single-panel liquid crystal video projector that uses only one liquid crystal panel or the liquid crystal panel for head-up display used in automobiles, etc. Like, white,
Alternatively, in the case of two-color mixing such as R + G, it becomes impossible to use the multilayer interference filter 25, and amplification of light in the normal direction cannot be obtained.

Further, in the liquid crystal display device using the flat fluorescent lamp, the flat panel fluorescent lamp and the flat fluorescent lamp may be vertically stacked to make the flat fluorescent lamp thinner or smaller, and the flat fluorescent lamp emits the fluorescent light. The light utilization efficiency can be improved by amplifying in the normal direction of the surface. However, in this case, 70 to 80% of the light incident on the liquid crystal panel from the flat fluorescent lamp is incident on the black matrix for partitioning each pixel of the liquid crystal panel and is absorbed, which is wasted.

[0015]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks of the prior art, and provides a flat fluorescent lamp capable of enhancing the utilization efficiency of light of a white or multi-color light source, Another object of the present invention is to provide a liquid crystal display device capable of improving the light utilization efficiency of a flat fluorescent lamp.

[0016]

The flat fluorescent lamp of the present invention comprises a plurality of linear cathodes, a back electrode arranged below the cathodes, and a mesh grid electrode arranged above the cathodes. In a flat fluorescent lamp having a metal thin film provided above the mesh grid electrode and a fluorescent layer formed on the upper surface of the metal thin film, in order to achieve the above object, the light emission side of the light source, that is, the fluorescent light is emitted. A microlens array in which microlenses are arranged outside the layer is arranged.

The above-mentioned microlens array can be constructed by arranging microlenses for converting incident light into parallel light traveling substantially in the normal direction of the fluorescent layer.

Further, it is preferable to provide a reflective layer having a high reflectance having a minute opening corresponding to each minute lens of the microlens array on the upper side of the fluorescent layer.

Further, a large number of openings may be formed in the grid electrode corresponding to the respective microlenses of the microlens array.

Further, a dot-shaped fluorescent layer may be formed corresponding to the minute openings of the grid electrode.

Further, the dot-shaped fluorescent layers having different emission colors may be alternately arranged in order.

A fluorescent lamp having another structure according to the present invention,
A plurality of linear cathodes, a back electrode arranged below the cathodes, a mesh grid electrode arranged above the cathodes, a metal thin film provided above the mesh grid electrodes, and a metal thin film In order to achieve the above object, a flat fluorescent lamp having a fluorescent layer formed on the upper surface of a glass plate in which glass pipes are two-dimensionally arranged on the light emitting side of the light source, that is, outside the fluorescent layer. Is arranged.

In order to achieve the above object, the liquid crystal display device of the present invention is a liquid crystal display device having a liquid crystal panel and a flat fluorescent lamp which are vertically stacked on top of each other. It is provided with a microlens array in which microlenses for converging are arranged in the opening of each pixel.

Further, the fluorescent layer of the flat fluorescent lamp may be configured to emit light in a dot shape at a position corresponding to the opening of each pixel of the liquid crystal panel.

Further, the fluorescent layer of the flat fluorescent lamp may be formed of dot-shaped fluorescent layers having different emission colors alternately at positions corresponding to the openings of each pixel of the liquid crystal panel.

[0026]

In the flat fluorescent lamp of the present invention, scattered light emitted from the fluorescent layer is converted into substantially parallel light by the action of the microlens array or the glass plate,
Alternatively, it is converged at a predetermined position such as a projection lens or an opening of each pixel of the liquid crystal panel.

In the liquid crystal display device of the present invention,
Since the light emission of the flat fluorescent lamp is converged on the opening of each pixel of the liquid crystal panel, it is possible to prevent the light from being absorbed unnecessarily by the black matrix, and it is possible to improve the utilization efficiency of the light emitted from the flat fluorescent lamp.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A flat fluorescent lamp according to a first embodiment of the present invention will be described with reference to the sectional view of FIG. 1 and the sectional view of FIG.
It is as follows.

This flat fluorescent lamp has a cathode panel 1
And the front panel 3 arranged at a predetermined interval above the cathode panel 1 through the frame glasses 2a, 2b, 2c.
And the cathode panel 1 and the frame glasses 2a to 2
C and the front panel 3 are sealed with a frit glass 4 to form a vacuum container.

A line-shaped cathode 6 fixed at a predetermined height by a spring-shaped cathode erection post 5 is provided on the upper side of the cathode panel 1, and a back electrode 7 is provided on the upper surface of the cathode panel 1. Further, a phosphor layer 8 and an Al thin film 9 are formed on the lower surface of the front panel 3 so as to face them. A conductive lead 10 for applying a high voltage is connected to the Al thin film 9. Further, a first grid 11 and a second grid 12 each made of a metal mesh are provided between the cathode 6 and the Al thin film 9.

The trajectory of the electron beam emitted from the cathode 6 is corrected by the back electrode 7, the amount of current passing through the back electrode 7 is controlled by the first git 11, and the electron beam is accelerated by the Al thin film 9 to enter the phosphor screen 8 and the phosphor Is excited to emit light. Also, the second
A voltage lower than that of the Al thin film 9 is applied to the grid 12 in order to enable the cutoff in the first grid 11.

A microlens array 14 in which a large number of microlenses 13 for converging light are densely provided is arranged above the front panel 3, and on the upper surface of the front panel 3,
A reflective film 16 made of aluminum (Al) having a large number of pinholes 15 corresponding to the respective microlenses 13 of the microlens array 14 is formed by vapor deposition, for example.

As a result, as shown by the arrow a in FIG.
Part of the light emitted from the fluorescent layer 8 passes through the pinhole 15, and the rest of the light is reflected by the reflection film 16 as indicated by an arrow b in FIG.
Is reflected on the front panel 3 and is incident on the phosphor layer through the front panel 3 and scattered by the phosphor. A part of this scattered light is shown in FIG.
As shown by the arrow c in FIG. In this way, reflection is repeated between the reflection film 16 and the fluorescent layer 8 through the front panel 3, and as a result, the minute pinhole 1
Most of the light beams of 5 and more are emitted as dot-shaped light. Then, the light emitted from the pinhole 15 of the reflection film 16 and incident on the microlens array 14 becomes parallel light heading in the normal direction of the fluorescent layer 8 by the converging action of each microlens 13 of the microlens array 14. Converted and fluorescent layer 8
It is possible to improve the utilization efficiency of the emitted light.

Next, a flat fluorescent lamp according to a second embodiment of the present invention will be specifically described with reference to the perspective view of FIG. 3 and the sectional view of FIG.

This fluorescent lamp comprises a cathode panel 1 and
A front panel 3 arranged at a predetermined interval above the cathode panel 1 via frame glasses 2a, 2b, 2c. The cathode panel 1, the frame glasses 2a to 2c and the front panel 3 are attached to a frit glass 4. Sealed with to make a vacuum container.

In this vacuum container, a line-shaped cathode 6 fixed to a predetermined height by a spring-shaped cathode erection post 5 is provided on the upper side of the cathode panel 1, and a rear electrode is provided on the upper surface of the cathode panel 1. 7 is provided, and a phosphor screen 8 and an Al thin film 9 are formed on the lower surface of the front panel 3. A conductive lead 10 for applying a high voltage is connected to the Al thin film 9. Further, the first grid 11 and the second grid 11 are provided between the cathode 6 and the Al thin film 9.
And a grid 17 are provided.

The first grid 11 is made of a metal mesh, and the second grid 17 is made of a metal plate having many pinholes 18.

The trajectory of the electron beam emitted from the cathode 6 is corrected by the back electrode 7, passes through the first grid 11, and enters the second grid 17. Here, most of the electrons are captured, but a part of the electrons pass through the pinholes 18 of the second grid 17 and enter the fluorescent layer 8 in a dot shape to excite the phosphor to emit light in a dot shape. By thus causing the fluorescent layer 8 to emit light in a dot shape, it is possible to save power consumption corresponding to the non-light emitting portion of the fluorescent layer 8.

On the upper side of the front panel 3 is a second grid 1
A microlens array 14 in which fine lenses corresponding to the pinholes 18 of 7 are arranged closely is arranged, and by this microlens array 14, the light emitted from the fluorescent layer is converted into parallel light heading in the normal direction of the fluorescent layer. It can be converged, the directivity can be enhanced, and the utilization efficiency of the light emission of the fluorescent layer can be enhanced.

Next, the liquid crystal display device according to the first embodiment of the present invention will be specifically described with reference to the sectional view of FIG.

This liquid crystal display device is provided with a flat fluorescent lamp L and a liquid crystal panel P, and the flat fluorescent lamp L is arranged above the cathode panel 1 via a frame glass at a predetermined interval. The cathode panel 1, the frame glass and the front panel 3 are sealed with frit glass to form a vacuum container.

In this vacuum container, a line-shaped cathode 6 fixed at a predetermined height by a spring-shaped cathode erection post is provided on the upper side of the cathode panel 1, and a back electrode is provided on the upper surface of the cathode panel 1. 7 is provided, and a fluorescent layer 8 and an Al thin film 9 are formed on the lower surface of the front panel 3. A conductive lead for applying a high voltage is connected to the Al thin film 9. Further, the cathode 6
A first grid 11 and a second grid 17 are provided between and the Al thin film 9. The first grid 11 is formed of a metal mesh, and the second grid 17 is a metal plate having a large number of pinholes 18. It is composed of.

The trajectory of the electron beam emitted from the cathode 6 is corrected by the back electrode 7, passes through the first grid 11, and enters the second grid 17. Here, most of the electrons are captured, but a part of the electrons pass through the pinholes 18 of the second grid 17 and enter the fluorescent layer 8 in a dot shape to excite the phosphor to emit light in a dot shape. By thus causing the fluorescent layer 8 to emit light in a dot shape, it is possible to save power consumption corresponding to the non-light emitting portion of the fluorescent layer 8.

A second grid 17 is provided above the front panel 3.
The microlens array 20 in which the minute lenses 19 corresponding to the respective pinholes 18 are minutely arranged is arranged, and the liquid crystal panel P is further arranged above the microlens array 20 so that the light emitted from the fluorescent layer 8 is transmitted to the microlens array. By means of 20, the light is converged in the opening 22 of each pixel formed in the black matrix 21 of the liquid crystal panel P.

As a result, the light emitted from the fluorescent layer 8 is incident on the opening 22 of the liquid crystal panel P without waste, and the fluorescent light was conventionally wasted from the fluorescent layer 8 on the black matrix 21. Approximately 70-80 of the amount of light emitted from the surface
% Of light can be utilized, and the utilization efficiency of light emission of the fluorescent layer 8 is significantly improved.

In this embodiment, the second grid 17
The pinholes 18, the microlenses 19 of the microlens array 20, and the openings 22 of the pixels of the liquid crystal panel P are arranged in a one-to-one correspondence so as to be aligned in the normal direction of the fluorescent layer 8. As shown in the cross-sectional view of FIG. 6, a microlens 1 that converts the light emitted from the fluorescent layer 8 into parallel light traveling in the normal direction of the fluorescent layer 8 corresponding to each pinhole 18.
A microlens array 14 in which 3 are arranged finely is provided, and a microlens 23 for condensing parallel light in the opening 22 of each pixel is provided on the lower surface of the black matrix 21 of the liquid crystal panel P in correspondence with the opening 22 of each pixel. You may comprise so that the microlens array 24 arranged minutely may be arrange | positioned.

In this case, the pinholes 18 of the second grid 17 of the flat fluorescent lamp L and the minute lenses 13 are made to correspond to each other, and the minute lenses 23 of the liquid crystal panel P and the openings 22 of the respective pixels are made to correspond to each other. It is not necessary to associate the pinholes 18 and the microlenses 13 of the flat fluorescent lamp L with the microlenses 23 and the openings 22 of each pixel. Further, the incidence of light on the black matrix 21 can be surely prevented by each minute lens 23 of the liquid crystal panel P, so that the light utilization efficiency can be further enhanced.

Further, as described above, when the pinholes 18 are formed in the second grid 17 to make the phosphor emit light in a dot shape, for example, as shown in the sectional view of FIG. 7 or the sectional view of FIG. In addition, the fluorescent layer 8 can be formed in a dot shape to reduce the amount of phosphor used and reduce the cost.

Further, when the fluorescent layer 8 is formed in a dot shape as described above, for example, the red fluorescent layer 8R and the green fluorescent layer 8 are formed.
By alternately arranging the G and blue fluorescent layers 8B alternately, color display can be performed without providing a color filter on the liquid crystal panel P, the liquid crystal panel of the color liquid crystal display panel can be made inexpensive, and light generated by the color filter can be used. The use efficiency of light can be further improved by eliminating the attenuation.

Next, a flat fluorescent lamp according to a third embodiment of the present invention will be specifically described with reference to the sectional view of FIG. 9 and the sectional view of the light emitting portion of FIG.

This flat fluorescent lamp has a cathode panel 1
And the front panel 3 arranged at a predetermined interval above the cathode panel 1 through the frame glasses 2a, 2b, 2c.
And the cathode panel 1 and the frame glasses 2a to 2
C and the front panel 3 are sealed with a frit glass 4 to form a vacuum container.

A line-shaped cathode 6 fixed at a predetermined height by a spring-shaped cathode erection post 5 is provided on the upper side of the cathode panel 1, and a back electrode 7 is provided on the upper surface of the cathode panel 1. Further, a phosphor layer 8 and an Al thin film 9 are formed on the lower surface of the front panel 3 so as to face them. A conductive lead 10 for applying a high voltage is connected to the Al thin film 9. Further, a first grid 11 and a second grid 12 each made of a metal mesh are provided between the cathode 6 and the Al thin film 9.

The trajectory of the electron beam emitted from the cathode 6 is corrected by the back electrode 7, the amount of current passing through it is controlled by the first guid 11, is accelerated by the Al thin film 9 and is incident on the phosphor layer 8, and the phosphor is Is excited to emit light. Also, the second
A voltage lower than that of the Al thin film 9 is applied to the grid 12 in order to enable the cutoff in the first grid 11.

A glass plate 27 in which minute glass pipes 26 are two-dimensionally arranged is arranged above the front panel 3. The glass pipe 26 has a divergent structure in which the diameter on the light emitting side continuously increases with respect to the diameter on the light incident side. On the inner surface of the glass pipe 26 and the surface of the glass plate 27 on the light incident side, a reflection film 28 made of Al or the like is formed.
a and 28b are formed.

The light emitted from the phosphor screen 8 is directly incident on the glass pipe 26 as shown by arrows A and B in FIG. 10, or the glass plate 2 as shown by arrow C.
Diffuse reflection is repeated between the reflection layer 28 b provided on the light incident side of No. 7 and the fluorescent layer 8 and then incident on the glass pipe 26.

Next, the optical path of the light incident on the glass pipe 26 will be described with reference to the sectional view of FIG. When the inclination angle of the divergent shape of the glass pipe 26 is θ, the light incident on the glass pipe 26 at an angle close to the normal direction of the fluorescent surface 8 passes through the glass pipe 26 as it is. The light incident at an angle α (α> θ) with respect to the line direction is reflected by the reflection film 28a provided on the inner surface of the glass pipe 26 as shown by an arrow D, and becomes an angle 2θ−α. Is emitted to. At this time, since 2θ−α <α, the light emitted from the glass pipe 26 is
The light travels in a direction close to the normal direction.

The light shown by the arrow D in FIG. 11 is an example of one-time reflection by the reflection film 28a, but the principle is the same even in the case of multiple reflection. Also, the length of the glass pipe 26,
Also, by optimizing the inclination, the parallelism of the emitted light can be increased.

As described above, by the action of the glass pipe 26, the light emitted from the fluorescent layer is converged into parallel light heading in the direction normal to the fluorescent screen, the directivity is enhanced, and the utilization efficiency of light emission from the fluorescent screen is improved. Can be increased.

[0059]

As described above, according to the flat fluorescent lamp of the present invention, since the microlens array in which the minute lenses are arranged outside the fluorescent layer is provided, the light emitted from the fluorescent layer is reduced to each minute. By converting the light into substantially parallel light with the lens, the light in the normal direction of the fluorescent layer can be amplified and the light utilization efficiency can be improved.

According to the flat fluorescent lamp of the present invention,
Since a microlens array in which minute lenses are lined up outside the fluorescent layer is provided, the light emitted from the fluorescent layer is converged by the minute lenses to the projection lens and the opening of each pixel of the liquid crystal panel, thereby It is possible to further increase the utilization efficiency of light by making the light emission incident on the projection lens and the opening portion without waste.

In the flat fluorescent lamp of the present invention,
In particular, when a highly reflective reflective layer having minute openings corresponding to the respective minute lenses of the microlens array is provided outside the fluorescent layer, the light returning to the fluorescent layer side by the reflective layer is: Scattered in the phosphor particles, a part of which is emitted to the outside from the minute opening of the reflective layer,
The remaining part is reflected again by the reflective layer. As a result, the light output of the component perpendicular to the fluorescent layer can be further amplified.

Furthermore, in the flat fluorescent lamp of the present invention,
In particular, when a large number of minute openings are formed at appropriate intervals on the grid electrode, the phosphor screen is dot-irradiated with an electron beam passing through the grid and emits light in dots.
Therefore, the power consumption corresponding to the non-light emitting part is eliminated,
Power consumption can be reduced.

In addition, in the flat fluorescent lamp of the present invention, when the fluorescent layer is made to emit light in a dot shape, the fluorescent layer can be formed in a dot shape corresponding to the minute openings of the grid electrode. It is possible to reduce the amount of use and reduce the cost.

Further, according to the flat fluorescent lamp of another structure of the present invention, since the glass plate having the glass pipes provided with the reflection film in a line is provided outside the fluorescent layer, the light emitted from the fluorescent layer is different from each other. By converting the light into substantially parallel light with a glass pipe, the light in the normal direction of the fluorescent layer can be amplified and the light utilization efficiency can be improved.

In the liquid crystal display device of the present invention, since the light emission of the flat fluorescent lamp is converged on the opening of each pixel of the liquid crystal panel by each microlens of the microlens array, the light emission of the flat fluorescent lamp becomes a black matrix. It is not wastefully absorbed, and the light utilization efficiency can be significantly improved.

Further, in the liquid crystal display device of the present invention, particularly when the flat fluorescent lamp is constructed to emit light in a dot shape at a position corresponding to the opening of each pixel of the liquid crystal panel, The power consumption can be reduced by the amount corresponding to the light emitting area.

Further, in the liquid crystal display device of the present invention, in particular, the fluorescent layer of the flat fluorescent lamp is composed of dot-shaped fluorescent layers having different emission colors alternately at positions corresponding to the openings of each pixel of the liquid crystal panel. In this case, color display can be performed without providing a liquid crystal filter on the liquid crystal panel, the filter of the color liquid crystal display panel can be made inexpensive, and the light attenuation by the color filter can be eliminated to further improve the light utilization efficiency. Can be raised.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of the present invention.

FIG. 2 is a sectional view of a light emitting portion according to the first embodiment of the present invention.

FIG. 3 is a perspective view of a second embodiment of the present invention.

FIG. 4 is a sectional view of a second embodiment of the present invention.

FIG. 5 is a cross-sectional view of a liquid crystal display device according to a first embodiment of the present invention.

FIG. 6 is a sectional view of a liquid crystal display device according to a second embodiment of the present invention.

FIG. 7 is a cross-sectional view of a liquid crystal display device according to another embodiment of the present invention.

FIG. 8 is a cross-sectional view of a liquid crystal display device according to still another embodiment of the present invention.

FIG. 9 is a sectional view of a third embodiment of the present invention.

FIG. 10 is a sectional view of a light emitting portion according to a third embodiment of the present invention.

FIG. 11 is a diagram showing a traveling state of light at a light emitting portion according to a third embodiment of the present invention.

FIG. 12 is a sectional view of a conventional example.

FIG. 13 is a cross-sectional view of another conventional example.

FIG. 14 is a characteristic diagram of a multilayer interference filter for green.

[Explanation of symbols]

 6 Cathode 7 Back Electrode 8 Fluorescent Layer 8B Blue Fluorescent Layer 8R Red Fluorescent Layer 8G Green Fluorescent Layer 9 Metal Thin Film 11 First Grid 12 Second Grid 13 Microlens 14 Microlens Array 15 Pinhole 16 Reflective Layer 17 Second Grid 18 Pin Hole 19 Micro lens 20 Micro lens array 23 Micro lens 24 Micro lens array 26 Glass pipe 27 Glass plate 28a Reflective film 28b Reflective film

Claims (4)

[Claims] 1. A flat fluorescent lamp in which a fluorescent layer emitting light from electrons from a cathode is formed on an inner surface side of a front panel of a vacuum container, and a microlens array in which microlenses are arranged is arranged on an outer surface of the front panel. A flat fluorescent lamp characterized in that 2. The light-incident side of the microlens array,
The flat fluorescent lamp according to claim 1, further comprising a reflecting member having a minute opening corresponding to the minute lens. 3. A flat fluorescent lamp in which a fluorescent layer emitting light from electrons from a cathode is formed on the inner surface side of a front panel of a vacuum container, and a glass pipe having a reflective layer on the inner surface is provided on the outer surface of the front panel. A flat fluorescent lamp having glass plates arranged in a three-dimensional array. 4. A liquid crystal display device which allows light from a flat fluorescent lamp to enter a liquid crystal panel, wherein the light from the flat fluorescent lamp is provided on the outer surface of the flat fluorescent lamp on the light-exiting side of the liquid crystal panel. A liquid crystal display device comprising a microlens array in which microlenses for converging are arranged in a line.