JPH0720435A - Projection type display device - Google Patents

Abstract

PURPOSE:To stabilize the electric discharge of a metal highland lamp by orthogonally crossing a voltage impressing axis and the light axis of a projection optical means and always keeping the voltage impression axis horizontal irrespective of a projection direction. CONSTITUTION:A white light is emitted from a lamp 10 and a red light is made incident on a liquid crystal light valve 15 by a red reflection dichroic mirror 11 via a mirror 14. A color light passing through the red reflection dichroic mirror 11 is reflection by a green reflection dichroic mirror 12 and made incident on the liquid crystal light valve 15. Further, a color light passing through the green reflection dichroic mirror 12, that is, a blue light, is reflected by the reflection mirror 14 twice and made incident on the liquid crystal light valve 15. A light transmission amount is controlled by the liquid crystal light valve 15 incident with the respect lights color by using an image electric signal. These modulated color lights are synthesized by a cube prism 16 having two color reglection characteristic and images are projected and formed on a screen by a projection lens 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type liquid crystal display device using a liquid crystal light valve.

[0002]

2. Description of the Related Art A conventional projection-type liquid crystal display device is a projection-type color display device using a liquid crystal light valve using a halogen lamp (Technical Papers 375 to 375 of Society for Information Display, conducted in May 1986). Paper published on page 378) "LCD F
u11 Color Video Proiecto
r ”and the like.

[0003]

However, a liquid crystal projector using a halogen lasop does not have sufficient brightness, and the hue (color reproducibility) as the quality of image products and the color temperature of white (of a TV receiver). NTSC standard color temperature is 6
With respect to 500 ° C.), it is difficult to obtain an image quality comparable to that of a television receiver, and further, uniformity (including color uniformity), which is an important element of the image, is not sufficient.

Therefore, the present invention solves such a problem, and an object thereof is to provide a projection type liquid crystal display device having a high color temperature of white and good color reproducibility. .

[0005]

In the projection type liquid crystal display device of the present invention, a liquid crystal light valve for image formation is used, and the lighting direction (discharge direction) of the discharge lamp is orthogonal to the optical axis center of the projection lens. It is characterized by being placed in.

[0006]

According to the above configuration of the present invention, the arc of the discharge lamp is always kept horizontal with respect to the mounting position of the projection type liquid crystal display device, so that the discharge of the discharge lamp becomes stable.

Furthermore, like a metal halide lamp,
Lamps filled with complex compounds of Sn, In, Tl, Ag, Na, I, etc. in the tube have different temperatures at which each metal atom evaporates, and the lamp is lit horizontally (the direction of the arc to be discharged is horizontal). ) Keeps the color stability of the projection type liquid crystal display device.

[0008]

【Example】

Example 1 Example 1 describes in detail the structure of a lamp with a reflector for the lamp used in the projection type liquid crystal display device of the present invention.

FIG. 1 is a cross-sectional view showing a cross section of a lamp with a reflector, and a discharge lamp 30 is a metal halide lamp filled with a composite compound. The electrode 31 is an electrode made of tungsten, and a molybdenum thin film 32 is thermocompression bonded.
The reflector 33 is bonded and fixed to the discharge lamp 30 by ceramic cement 34.

The reflector 33 is a parabola or an elliptical reflector, and the bisected light emitting point of the sunset electrode 31 is aligned with the optical focus position.

FIG. 2 is a partial detailed view showing how the discharge lamp shown in FIG. 1 discharges. The state of the discharge is as follows: a discharge arc 20 in which a spectrum peculiar to a metal when dissociating into a metal atom or a halogen atom of mercury Ag or another halogen compound inside the lamp is relatively centered between the electrodes, and an outer side apart from the center There is a discharge arc 21.

In these discharge lamps, all the conditions such as color change, deterioration of illuminance uniformity, and discharge stability are sensitive to the lighting posture of the lamp (direction of discharge of the discharge lamp). There is. That is, it is important for the discharge lamp to maintain a constant lighting posture.

Example 2 Example 2 describes in detail the structure of the projection type liquid crystal display device of the present invention.

FIG. 3 is a plan layout view of a projection type liquid crystal display device using three transmissive liquid crystal light valves.

The lamp 10 is a discharge lamp having the contents described in Example 1, and the white light emitted from the lamp 10 is
The red light is incident on the liquid crystal light valve 15 via the mirror 14 by the red reflection dichroic mirror 11. The color light transmitted through the red reflection dichroic mirror 11 is reflected by the green reflection dichroic mirror 12 and enters the liquid crystal light valve 15. Further, the color light transmitted through the green reflection dichroic mirror 12, that is, the blue light, is reflected by the reflection mirror 14 twice and enters the liquid crystal light valve 15. The liquid crystal light valve 15 on which each color of light is incident controls the amount of light transmitted by an electric signal of a television image or a computer graphics image. The modulated color lights are combined by the cube prism 16 having the reflection characteristics of two colors, and the projected lights form an image on the screen by the projection lens 13.

In this embodiment, the emission direction of the lamp 10 and the optical center of the projection lens 13 are arranged at positions orthogonal to each other.

FIG. 4 is a plan layout view showing the structure of another embodiment of the projection type liquid crystal display device of the present invention. The white light emitted from the lamp 10 changes its direction to 90 ° by the mirror 14 and enters the X-shaped dichroic mirror 17. The incident white light is separated into the three primary colors R, G and B of light in the remaining three directions, and the colored light is guided to the liquid crystal light valve 15 by the mirror 14. Then, an image is formed on the screen in the same manner as in FIG. This embodiment is also similar to FIG. 3, and the emission direction of the lamp 10 and the optical center of the projection lens 13 are arranged at positions orthogonal to each other.

FIG. 5 is a plan layout view of a projection type liquid crystal display device showing still another embodiment of the present invention. White light emitted from the light source 10 is color-separated into three primary colors by the red reflection dichroic mirror 11 and the green reflection dichroic mirror 12, and enters the liquid crystal light valve 15. In the color combination, the red reflection dichroic mirror 11 and the green reflection dichroic mirror 12 perform color combination, and projection is performed by the lens 13.

Also in this embodiment, as in FIGS. 3 and 4, the emission direction of the lamp 10 and the optical center of the projection lens 13 are arranged at positions orthogonal to each other.

Example 3 In Example 3, the projection type display device of the present invention will be described in detail with reference to schematic diagrams in a state in which the projection type display device is actually used from various angles.

FIG. 6 is a schematic view showing four states (a) to (d) of the actual use state of the projection type liquid crystal display device of the present invention.

(A) From the ceiling of the projection type liquid crystal display device,
The state of being caught.

(B) ... A state in which the projection type liquid crystal display device is placed on the floor and projected on the screen.

(C) ... A state in which the projection type liquid crystal display device is placed on the floor and the screen is installed on the ceiling.

(D) A state where the projection type liquid crystal display device is caught from the ceiling and projected on the floor.

In the above four states, since the projection type liquid crystal display device is portable, it can be installed with a high degree of freedom in actual use. When the projection type liquid crystal display device main body 1 is suspended from the ceiling, the angle of elevation θ needs to be such that the viewer does not cast a shadow on the screen 2, and when it is placed on the floor and projected on the screen 2. , The elevation angle θ is required in the direction opposite to the elevation angle θ when it is suspended from the ceiling.

Further, when the projection type liquid crystal display device is placed on the floor and projected on the ceiling, the projections are directed upward. However, by using the projection type liquid crystal display device as shown in FIGS. The discharge lamp can keep its posture in a horizontal lighting state. Further, as in (d), when the projection is suspended from the ceiling and projected on the floor, the projection lens faces downward, but even in this case, the discharge lamp can keep the horizontal lighting state.

Although the four basic practical use states have been described above, the optical center of the projection lens and the discharge direction of the discharge lamp are always arranged orthogonally to each other regardless of the position of the elevation angle θ.

[0029]

As described above, according to the present invention, the discharge state of the discharge lamp is stabilized by arranging the lighting direction (discharge direction) of the discharge lamp orthogonal to the optical axis center of the projection lens. In particular, in the case of a portable projection-type liquid crystal display device, it is possible to realize a projection direction such as hanging down on the ceiling or enlarging and projecting toward the ceiling, which has been impossible with conventional CRT projectors. It has become possible.

Further, in the case of a discharge lamp, there is no color unevenness development that occurs due to deviation of the arc due to the lighting posture, and a stable illuminance distribution can be obtained by always keeping the lighting posture horizontal.

[Brief description of drawings]

FIG. 1 is a sectional view of a structure of a lamp according to a first embodiment of the present invention.

FIG. 2 is a partial detailed view showing how the lamp of the present invention is discharged.

FIG. 3 is a plan layout view of a projection type liquid crystal display device using three transmissive liquid crystal light valves according to a second embodiment of the present invention.

FIG. 4 is a plan layout view showing the configuration of another embodiment of the projection type liquid crystal display device according to the second embodiment of the present invention.

FIG. 5 is a plan layout view of a projection type liquid crystal display device showing still another embodiment of the second embodiment of the present invention.

FIG. 6 is a schematic diagram assuming actual use of a projection display apparatus according to a third embodiment of the present invention.

[Explanation of symbols]

 15 ・ ・ ・ Liquid crystal light valve 20 ・ ・ ・ Discharge arc 30 ・ ・ ・ Discharge lamp 33 ・ ・ ・ Reflector

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] May 25, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

Title : Projection display device

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type display device using a metal halide lamp as a light source.

[0002]

2. Description of the Related Art A conventional projection display device is a projection display device (19) using a liquid crystal light valve using a halogen lamp.
Technical Papers 375-37 of Society for Information Display, May 1986
(Paper published on page 8) "LCD Full Co
"or Video Projector" and the like.
Also, a projection display device that uses a metal halide lamp
Proposed.

[0003]

However, the projection display device using the halogen lamp is not sufficiently bright,
Also, the color tone (color reproducibility) as the image quality and the white color temperature (NTSC standard color temperature of the television receiver is 650
Regarding 0 ° C.), it is difficult to obtain an image quality comparable to that of a television receiver, and further, uniformity (including color uniformity), which is an important element of the image, is not sufficient.

A conventional metal halide lamp was used.
The projection display is lit horizontally (the direction of the arc being discharged is
It is a design that does not take into account keeping horizontal)
Therefore, the discharge of the metal halide lamp becomes unstable and the projection
There was a problem with the color stability of the mold display device .

Therefore, the present invention solves such a problem, and an object of the present invention is to provide a projection display device having a high color temperature of white and good color reproducibility. .

[0006]

A projection display device of the present invention
Emits light by applying a voltage between the two electrodes
Light source part consisting of metal halide lamp and reflector
And the light from the light source unit to the first color light, the second color light, and the second color light.
A color separation means for separating the light into three color lights;
And three liquid crystal light valves for modulating each color light,
Color combination that combines the colors of light modulated by the liquid crystal light valve
Forming means and projection optical means for projecting the color-combined light
In the projection display device having:
The optical axis of the projection optical means is orthogonal to each other.
To do.

[0007]

According to the above configuration of the present invention, the metal halide is
The voltage application axis of the lamp is related to the projection direction of the projection display device.
However, since it is always kept horizontally, the metal halide
Pump discharge is stable.

[0008]

EXAMPLES Example 1 In Example 1, a light source unit used in the projection display device of the present invention
The structure of will be described in detail.

FIG. 1 is a cross-sectional view showing a cross section of a light source section, and a discharge lamp 30 is a metal halide lamp filled with a composite compound. The electrode 31 is an electrode made of tungsten, and a molybdenum thin film 32 is thermocompression bonded. Reflector 3
3 is adhered and fixed to the discharge lamp 30 by a ceramic cement 34.

The reflector 33 is a parabola or an elliptical reflector, and the bisected light emitting point of the tungsten electrode 31 is aligned with the optical focus position.

FIG. 2 is a partial detailed view showing how the metal halide lamp shown in FIG. 1 is discharged. The state of the discharge is as follows: a discharge arc 20 in which a spectrum peculiar to a metal when dissociating into a metal atom or a halogen atom of mercury Ag or another halogen compound inside the lamp is relatively centered between the electrodes, and an outer side apart from the center There is a discharge arc 21.

In these discharge lamps, all conditions are sensitive to the lighting posture of the lamp ( direction of the voltage application axis of the discharge lamp), color tone change, deterioration of illuminance uniformity, and further discharge stability. Has been done. That is, it is important for the discharge lamp to maintain a constant lighting posture.

Example 2 In Example 2, the structure of the projection display apparatus of the present invention will be described in detail.

FIG. 3 is a plan layout view of a projection display device using three transmissive liquid crystal light valves.

The lamp 10 is a discharge lamp having the contents described in Example 1, and the white light emitted from the lamp 10 is
The red light is incident on the liquid crystal light valve 15 via the mirror 14 by the red reflection dichroic mirror 11. The color light transmitted through the red reflection dichroic mirror 11 is reflected by the green reflection dichroic mirror 12 and enters the liquid crystal light valve 15. Further, the color light transmitted through the green reflection dichroic mirror 12, that is, the blue light, is reflected by the reflection mirror 14 twice and enters the liquid crystal light valve 15. The liquid crystal light valve 15 on which each color of light is incident controls the amount of light transmitted by an electric signal of a television image or a computer graphics image. The modulated color lights are combined by the cube prism 16 having two color reflection characteristics, and the projection lens 13 projects an image on the screen.

In this embodiment, the direction of the voltage application axis of the lamp 10 and the optical axis of the projection lens 13 are arranged at positions orthogonal to each other.

FIG. 4 is a plan view showing the configuration of another embodiment of the projection type display device of the present invention. The white light emitted from the lamp 10 changes its direction to 90 ° by the mirror 14 and enters the X-shaped dichroic mirror 17. The incident white light is separated into the three primary colors R, G and B of light in the remaining three directions, and the colored light is guided to the liquid crystal light valve 15 by the mirror 14. Then, an image is formed on the screen in the same manner as in FIG. This embodiment is also similar to FIG. 3, the voltage sign of the lamp 10
The direction of the additional axis and the optical axis of the projection lens 13 are arranged at positions orthogonal to each other.

The projection 5, showing yet another embodiment of the present invention
It is a plane layout drawing of a photo-type display device . White light emitted from the light source 10 is color-separated into three primary colors by the red reflection dichroic mirror 11 and the green reflection dichroic mirror 12, and enters the liquid crystal light valve 15. The color combination is performed by the red reflection dichroic mirror 11 and the green reflection dichroic mirror 12 and projected by the projection lens 13.

Also in this embodiment, as in FIGS. 3 and 4, the direction of the voltage application axis of the lamp 10 and the optical axis of the projection lens 13 are arranged at positions orthogonal to each other.

Example 3 In Example 3, the projection type display device of the present invention will be described in detail with reference to schematic diagrams in a state in which the projection type display device is actually used from various angles.

FIG. 6 is a schematic diagram showing four states (a) to (d) of the actual use state of the projection display apparatus of the present invention.

(A) A state in which the projection display device is caught from the ceiling.

(B) A state in which the projection display device is placed on the floor and projected on the screen.

(C) ... A state in which the projection display device is placed on the floor and the screen is installed on the ceiling.

(D) ... A state in which the projection display device is fished from the ceiling and projected on the floor.

In the above four states, the projection type display device
Since it is portable, it can be installed with a high degree of freedom in actual use. Projection-type display device this body 1, when suspended in the ceiling, the elevation angle θ is, for the viewer is the screen 2, becomes necessary angle which is not in the shadow, also, if you put on the floor and projected on the screen 2 , Elevation angle when hanging from the ceiling θ
An elevation angle θ is required in the opposite direction to.

Further, when the projection type display device is placed on the floor and projected on the ceiling, the projection lens is directed upward, but FIG.
By using a projection display device as shown in FIG.
The discharge lamp can keep its posture in a horizontal lighting state.
Further, the projection lens is directed downward even when it is projected from the ceiling by hanging it down from the ceiling as in (d), but in this case also, the discharge lamp can maintain the horizontal lighting state.

Although the four basic practical use conditions have been described above, no matter which position the elevation angle θ is set to, the optical axis of the projection lens and the voltage application axis of the discharge lamp are always arranged orthogonal to each other. ing.

[0029]

As described above, the projection type table of the present invention is provided.
The device is a metal halide lamp voltage application axis and projection light.
Since the optical axis of the learning means is orthogonal,
Regardless of the installation state or the projection direction, the metal halide
The discharge condition of the pump becomes stable and reproduced on the screen.
The image color reproducibility does not deteriorate.

That is, the projection display device should be installed horizontally.
If you install it in a diagonal or vertical direction,
Project the light on the screen by tilting the optical axis of the lens vertically
Even if the voltage application axis of the metal halide lamp is
It becomes possible to hold the temperature inside the metal halide lamp.
Distribution is stable, and the discharge state is stable.
The color temperature and illuminance distribution of the light emitted is stable,
Improves the color reproducibility of the image reproduced on the screen
It has the special effect of being able to.

[0031]

[Brief description of drawings]

FIG. 1 is a sectional view of a structure of a light source unit according to a first embodiment of the present invention.

FIG. 2 is a partial detailed view showing how the lamp of the present invention is discharged.

FIG. 3 is a plan layout view of a projection display device using three transmissive liquid crystal light valves according to a second embodiment of the present invention.

FIG. 4 is a plan layout view showing the configuration of another embodiment of the projection display apparatus according to the second embodiment of the present invention.

FIG. 5 is a projection showing another embodiment of the second embodiment of the present invention.
FIG. 3 is a plan layout view of the mold display device .

FIG. 6 is a schematic diagram assuming actual use of a projection display apparatus according to a third embodiment of the present invention.

[Explanation of reference signs] 15 ... Liquid crystal light valve 20 ... Discharge arc 30 ... Discharge lamp 33 ... Reflector

Claims (1)

[Claims] 1. A projection type display device using a liquid crystal light valve for forming an image, wherein a lighting direction (discharge direction) of a discharge lamp is arranged orthogonal to an optical axis center of a projection lens. Projection type liquid crystal display device.