JP2000356807A - Irradiation type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an irradiation type display device constituted so that light condensing loss is reduced even when a plurality of light sources are used. SOLUTION: This display device is provided with a 1st light emitting source 1a, a 1st condensing means 2a converting the light radiated by the emitting source 1a to luminous flux oriented in a single direction and emitting it, a 2nd light emitting source 1b, a 2nd condensing means 2b converting light radiated by the emitting source 1b to luminous flux oriented in a single direction and emitting it, a 1st lens array 3 constituted of a plurality of lenses splitting the luminous flux emitted from the condensing means 2a and 2b to a plurality of partial luminous flux and a 2nd lens array 4 paired with the array 3 and constituted of a plurality of lenses. Then, the images of the aperture shapes of the respective lenses of the array 3 are formed on a surface to be irradiated 8 by the respective lenses of the array 4 and irradiated. In this case, the luminous flux emitted by the condensing means 2a is directly made incident on the array 3 and the luminous flux emitted by the condensing means 2b is made incident on the array 3 after bending the optical path thereof by a reflection means 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illuminated display device such as a liquid crystal projector, and more particularly to an illuminated display device having a plurality of light sources.

[0002]

2. Description of the Related Art Heretofore, there has been known an irradiation type display device of this type, in which a plurality of light emitting sources are provided in order to improve the brightness of a displayed image. FIG. 6 is an explanatory plan view showing a schematic configuration of a conventional irradiation type display device provided with two light emitting sources. The irradiation type display device shown in FIG. 6 employs a liquid crystal light valve three-plate optical system in which light is synthesized by a cross dichroic prism.

In FIG. 6, two sets of light sources 1a and 1b and reflectors 2a and 2b are arranged side by side, and the light emitted from the light sources 1a and 1b reflected by the reflectors 2a and 2b is , And enters the first lens array 3 formed by combining a plurality of lenses. The first lens array 3 has the same effect on the two light sources 1a and 1b and the reflectors 2a and 2b.

[0004] The first lens array 3 includes a reflector 2
The light beams emitted from a and 2b are divided into a plurality of partial light beams by each lens, and the light beams are emitted near an opening of a second lens array 4 composed of a plurality of lenses paired with each lens of the first lens array 3. Is converged. Further, the second lens array 4 forms and illuminates the lens aperture shape of the first lens array 3 onto the liquid crystal light valve 8 which is a surface to be irradiated.

[0005] The transmitted light of the second lens array 4 passes through the condenser lens 5, and then the blue light (B light) and the green light (G light) are reflected by the dichroic mirror 6, and only the red light (R light) is emitted. The light passes through the dichroic mirror 6. The R light transmitted through the dichroic mirror 6 is converted into video information by an R signal conversion liquid crystal light valve 8a.

G light reflected by the dichroic mirror 6,
The B light is further separated by the dichroic mirror 7 into reflected G light and transmitted B light. The G light reflected by the dichroic mirror 7 is converted into video information by a G signal conversion liquid crystal light valve 8b.

Since the B light transmitted through the dichroic mirror 7 has a different optical path length from the R light and G light, the B light is converted into video information by a B signal conversion liquid crystal light valve 8c via relay lenses 9a and 9b. You. The video information converted lights by the respective liquid crystal light valves 8a, 8b, 8c are combined by the cross dichroic prism 10 and projected on the screen 12 by the projection lens 11.

Here, the distribution of light from the two light sources 1a and 1b on the first lens array 3 and the second lens array 4 is shown in FIG. As shown in FIG. 7A, the first lens array 3 and the second lens array 4 are constituted by a combination of lenses in 5 rows and 12 columns, and have almost the same specifications.

Light emitted from the two light sources 1a and 1b is, as shown in FIG. 7 (b), on the first lens array 3 and has substantially the same shape as the exit aperture of each of the reflectors 2a and 2b. Distribute. At this time, the light distribution on the second lens array 4 is as shown in FIG.

Next, FIG. 8 shows the light converging function of the lens array. Light emitted from the light sources 1a and 1b and reflected by the reflectors 2a and 2b passes through the first lens array 3 and forms an image on the second lens array 4. Therefore, in the second lens array 4, a light source image as shown in FIG. 7C is formed.

At this time, the image formed on the second lens array 4 is only the lens of the first lens array 3 corresponding to the lens and having the light from the reflectors 2a and 2b. For this reason, the ranges where the light exists on the first lens array 3 and the second lens array 4 are substantially the same.

The light transmitted through the second lens array 4 is imaged and illuminated on the liquid crystal light valve 8 which is the surface to be illuminated. At this time, the light emitted from the lenses of the lens arrays 4 and 5 is bent by the condenser lens 5 and forms an image so as to overlap at the same position on the surface of the liquid crystal light valve 8. Therefore, the light emitted from the light sources 1a and 1b is
Even when the two reflectors 2a and 2b are arranged side by side, it is possible to illuminate the liquid crystal light valve 8 uniformly.

FIG. 9 shows a range in which light from the light source formed on the second lens array 4 exists. As can be seen from FIG. 9, the range in which light is generated on the second lens array 4 is substantially the same as the shape of the exit aperture of the reflectors 2a and 2b.

The range in which light is generated on the second lens array 4 needs to be within a circle, which is the effective capture range, in consideration of the effective capture of light by the projection lens 11. FIG. 10 shows the relationship between the capturing range of the projection lens 11 and the light distribution range.

The problem here is that the second lens array 4 must be located in the circular
Therefore, the range in which light exists is small. This indicates that the light-collecting efficiency is poor, and this is because light does not exist at a position where the light can be effectively captured as the projection lens 11.

As a method of improving such a problem,
As shown in FIG. 11, there is a method of cutting adjacent surfaces of the reflectors 2a and 2b and arranging the two reflectors 2a and 2b as close as possible to their central axes.

FIG. 12 shows the relationship between the range of capture by the projection lens 11 and the range of light distribution in this method. However, even in this case, it is necessary to attach a brim to the cut surface as the shape of the reflectors 2a and 2b.
This portion becomes an invalid area as a reflection surface.

Further, if the reflectors 2a and 2b are arranged in complete contact with each other, the contact surface may be damaged due to vibration during transportation of the device or the like. Therefore, the two reflectors 2a and 2b are designed by design. Must be separated from each other. Therefore, the separated area is also an invalid area as an anti-slope.

Therefore, as can be seen from FIG. 12, there is a light-free portion at the center, and the light-collecting efficiency is reduced at this portion. Moreover, when the shape of the reflectors 2a and 2b is cut from a circular shape,
Disturbance of the shape of the anti-slope surface occurs in the cut portion, and this also lowers the light collection efficiency.

[0020]

However, in the above-mentioned conventional illuminated display device, when two light sources 1a and 1b are used, the reflectors 2a and 2b are arranged side by side. Reflectors 2a, 2
b. Ineffective area due to brim, and two reflectors 2
There is a problem that an invalid area is generated due to the mounting intervals of a and 2b, which causes a reduction in light collection efficiency. Further, even when the reflectors 2a and 2b are formed in a cut shape, there is a problem that the light collection efficiency is also lowered due to the disorder of the anti-slope shape of the cut portion.

The present invention has been made in view of the above points, and even when a plurality of light sources are used,
It is an object of the present invention to provide an irradiation type display device with a small light collection loss.

[0022]

An irradiation type display device according to the present invention converts a light emitted from a first light emitting source into a light beam directed in a single direction and emits the light. A first light-collecting means, a second light-emitting source, and a second light-collecting means that converts radiation emitted by the second light-emitting source into a light beam directed in a single direction and emits the light, A first lens array composed of a plurality of lenses that divides a light beam emitted by the first and second condensing means into a plurality of partial light beams, and a second lens array composed of a plurality of lenses paired with the first lens array. An illumination type display device, comprising: an aperture shape of each lens of the first lens array, by each lens of the second lens array, for image-forming and illuminating an irradiated surface. The light beam emitted by the light condensing means is directly incident on the first lens array. Rutotomoni, the light beam emitted by the second focusing means, after bending the optical path by the reflecting means,
The light is incident on the first lens array.

Thus, it is possible to arrange the first and second light condensing means at a position where no invalid area is generated between them, and it is possible to suppress a decrease in light condensing efficiency. In addition, since a circular reflector can be used as the first and second condensing means, a bright display with little condensing loss without causing a decrease in condensing efficiency due to a disorder of the reflecting surface shape or the like. Images can be obtained.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the irradiation type display device of the present invention will be described below with reference to FIGS. 1 to 5. Omitted.

Here, FIG. 1 is an explanatory plan view showing a schematic configuration of the irradiation type display device of the present embodiment, FIG. 2 is an explanatory side view showing a schematic configuration of a main part of the irradiation type display device of the present embodiment, and FIG. FIG. 3 is a three-side explanatory view showing a schematic configuration of a main part of the irradiation type display device of this embodiment, FIG. 4 is a schematic diagram showing an illuminance distribution in a lens array in the irradiation type display device of this embodiment, and FIG. FIG. 5 is an explanatory diagram showing a relationship between a capturing range of a projection lens and a light distribution range in the irradiation type display device.

As shown in FIGS. 1 and 2, the illumination type display device of this embodiment has two light sources 1a, 1b and reflectors 2a, 2b as compared with the conventional example described above with reference to FIG.
And a mirror 13 for totally reflecting the light emitted from the reflector 2b and entering the first lens array 3 is provided. Other configurations are the same as the above-described conventional example.

That is, the light from the light source 1a reflected by the reflector 2a directly enters the first lens array 3 in which a plurality of lenses are combined. On the other hand, light from the light source 1b reflected by the reflector 2b is reflected by the mirror 13
After being reflected by the optical path and bending the optical path, the light enters the first lens array 3.

Two sets of light sources 1a, 1b, reflector 2
As shown in FIG. 3, in order to prevent the respective reflectors 2a and 2b from interfering with each other, the reflectors 2a which directly enter the light are arranged at a lower position as shown in FIG.
Reflector 2b that bends the optical path with mirror 13 and enters
Are arranged in the upper row, respectively.

Further, each reflector 2a, 2b
Are arranged such that the optical axis when viewed from above (Y direction) is the same axis so that the light-collecting efficiency is the highest. Further, the respective optical axes viewed from the side (X direction, Z direction) are arranged close to each other so as to obtain the highest efficiency.

As described above, by displacing the reflectors 2a and 2b vertically and arranging them so that their emission directions are orthogonal to each other, the reflectors 2a and 2b interfere with each other as in the above-described conventional example. Arrangements that could not be arranged are also possible.

The light incident on the first lens array 3 via each optical path is divided into a plurality of partial light beams and converged in the vicinity of the opening of the paired second lens array 4. The second lens array 4 forms and illuminates the aperture shape of the first lens array 3 forming a pair with the aperture of the first lens array 3 on the liquid crystal light valve 8 which is the surface to be irradiated.

Here, the distribution of light from the two light sources 1a and 1b on the first lens array 3 and the second lens array 4 is shown in FIG. As can be seen from FIG. 4, there is no invalid region between the ranges where the light from the two light sources 1a and 1b exist.

This consists of two reflectors 2a, 2b
However, since the light is incident on the optical path in two ways, that is, the direct incidence and the reflected incidence, the respective light existing areas can be brought close to each other without the reflectors 2a and 2b interfering with each other.

Further, the projection lens 11 in the present embodiment
5 and the range of light are shown in FIG. As can be seen from FIG. 5, according to the present embodiment, the capturing of the projection lens 11 is well matched with the region where light is present, and it is possible to improve the light collection efficiency.

In the case of this embodiment, the reflector 2
Since the openings a and 2b are used in the form of the circular shape, there is no disturbance in the shape of the reflecting surface that occurs when the shape of the reflector is cut from the circular shape, so that the light collection efficiency does not decrease.

[0036]

Since the irradiation type display device according to the present invention has the above-described configuration, the first and second light collecting means can be arranged at a position where no invalid area is generated between them. This makes it possible to suppress a decrease in light collection efficiency. In addition, since a circular reflector can be used as the first and second condensing means, a bright display with little condensing loss without causing a decrease in condensing efficiency due to a disorder of the reflecting surface shape or the like. Images can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory plan view showing a schematic configuration of an irradiation type display device according to an embodiment of the present invention.

FIG. 2 is an explanatory side view showing a schematic configuration of a main part in one embodiment of the irradiation type display device of the present invention.

FIG. 3 is a three-side explanatory view showing a schematic configuration of a main part in one embodiment of the irradiation type display device of the present invention.

FIG. 4 is a schematic diagram showing an illuminance distribution in a lens array in one embodiment of the irradiation type display device of the present invention.

FIG. 5 is an explanatory diagram showing a relationship between a capturing range of a projection lens and a light distribution range in an embodiment of the irradiation type display device of the present invention.

FIG. 6 is an explanatory plan view showing a schematic configuration of a conventional irradiation type display device.

FIG. 7 is an explanatory diagram showing an illuminance distribution in a lens array in a conventional irradiation type display device.

FIG. 8 is an explanatory view showing a light convergence action by a lens array in a conventional irradiation type display device.

FIG. 9 is a schematic diagram showing an illuminance distribution in a lens array in a conventional irradiation type display device.

FIG. 10 is an explanatory diagram showing a relationship between a capturing range of a projection lens and a light distribution range in a conventional irradiation type display device.

FIG. 11 is a schematic diagram showing an illuminance distribution in a lens array in another conventional irradiation type display device.

FIG. 12 is an explanatory diagram showing a relationship between a capturing range of a projection lens and a light distribution range in another conventional irradiation type display device.

[Explanation of symbols]

 1a, 1b Light source 2a, 2b Reflector 3 First lens array 4 Second lens array 5 Condenser lens 6 Dichroic mirror 7 Dichroic mirror 8 Liquid crystal light valve 9 Relay lens 10 Cross dichroic prism 11 Projection lens 13 Mirror

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H088 EA14 EA15 HA13 HA21 HA25 HA28 MA01 MA04 2H091 FA05X FA05Z FA14X FA14Z FA17Z FA26X FA26Z FA29Z FA41Z FD01 FD03 LA03 LA16 5C058 AB06 AB07 BA05 EA12 EA13 EA26 EA51

Claims (1)

[Claims] A first light-emitting source; first light-collecting means for converting light emitted by the first light-emitting source into a light beam directed in a single direction and emitting the light; and a second light-emitting source. A second light condensing unit that converts the emitted light from the second light emitting source into a light beam directed in a single direction and emits the light beam, A first lens array including a plurality of lenses that divide the light into a plurality of partial light beams; and a second lens array including a plurality of lenses that form a pair with the first lens array. In an irradiation type display device in which an aperture shape of each lens is formed and illuminated on an irradiation surface by each lens of the second lens array, the light beam emitted by the first condensing means is directly transmitted to the first lens. While being incident on the array, emission by the second focusing means Bundles, after bending the optical path by the reflection means, illuminated display, characterized in that to be incident on the first lens array.