JPH11109504A - Projection display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size and the influence of heat on the main body of a display device, in a liquid crystal projector having a projection composite optical system housed in the device main body, when projection is not performed. SOLUTION: The projection composite optical system including liquid crystal panels 26a, 26b and 26c, a cross dichroic prism 32 and a projection lens 33, of a liquid crystal projector device P is moved/housed in the device main body, from a state where the projection composite optical system is projected from the device main body, at the time of projection, at the time of non-projection. Then, the projection and nonprojection states are detected by respective position detecting parts. Control is executed so that in the projection state, a light source and a liquid crystal panel part are cooled by cooling fans 34 and 35 for a specified time respectively and when a temperature sensor indicates a fixed temp. or below, the fans are stopped and then, the switch of a light source lamp 21 is turned on, and at the time of movement to the nonprojection state, the light source switch is tuned off.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a projection display device such as a liquid crystal projector device.

[0002]

2. Description of the Related Art Conventionally, a liquid crystal projector device is configured so that the relative positions of a projection combining optical system and an illumination system do not differ between during projection and during non-projection. FIG. 5 shows an example of a conventional dichroic prism type liquid crystal projector. As shown in FIG. 1, light emitted from a light source 1 is reflected by a total reflection mirror 1a, is made uniform by an integrator 2, and then enters a first dichroic mirror 3,
Of the incident light, green and blue color lights are reflected and pass red light. The transmitted red light is reflected by the reflection mirror (dichroic mirror) 4 and enters the red light liquid crystal panel 6a via the condenser lens 5a. On the other hand, the reflected green / blue color light is incident on the second dichroic mirror 7, and the green light is reflected and incident on the green light liquid crystal panel 6b via the condenser lens 5b. The optical path is changed by a total reflection mirror 9 via a relay lens 8, and is incident on a blue light liquid crystal panel 6 c via a condenser lens 5 c via a relay lens 10 and a total reflection mirror 11.
Each of the liquid crystal panels 6a. Light beams incident on 6b and 6c are projected on a screen by a projection lens 13 via a cross dichroic prism 12. The light source unit is cooled by the cooling fan 14, and the liquid crystal panel unit is cooled by the cooling fan 15.

[0003]

By the way, in the above-mentioned conventional example, the portion of the projection lens 13 protrudes from the apparatus, so that it is difficult to store the projector lens 13 and it is difficult to reduce the size.

The present invention eliminates the drawbacks of the prior art described above, makes it possible to make the relative position between the projection combining optical system and the illumination system different between during projection and during non-projection, thereby providing a neat form when stored, and to reduce the size of the apparatus. It is an object of the present invention to provide a projection display device that can be realized.

[0005]

In order to achieve the above-mentioned object, the present invention provides a projection combining optical system including a projection lens in which the position at the time of projection is different from the position at the time of non-projection, and detecting the position. In this embodiment, on / off of the light source switch and drive control of the operation of the cooling fan are performed.

[0006]

According to the present invention, there is provided a projection display apparatus in which the relative positions of a projection composite optical system and an illumination system are different between during projection and during non-projection. A position detecting unit in a state housed in the device, a control unit for turning off the light source, and a cooling fan for the light source and the main part, and the cooling of the light source and the main part by the cooling fan ends in the projection state. If the position detection unit detects the housed state of the projection combining optical system, the control unit turns off the light source switch, thereby suppressing the thermal effect on the apparatus main body when the projector is in the non-projection state and reducing waste. Avoid excessive power consumption. The present invention according to claim 2 includes a position detecting unit in a projection state and a control unit for turning on a light source. When the position detecting unit detects a position in the projection state, the cooling fan operates for a predetermined time before the light source is turned on. By doing so, the effect of heat on the apparatus main body in the projection state is reduced and unnecessary power consumption is avoided. According to a third aspect of the present invention, a temperature sensor is provided as a detecting means, and the timing of turning on / off the switch of the cooling fan is optimized under a constant temperature condition, thereby suppressing a thermal influence on a product body. Can be.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a plan view showing a schematic configuration of the liquid crystal projector device of the present embodiment, FIG. 2 is a side view thereof, and FIG.
Is a block diagram for its operation. In the figure, 2
Reference numeral 1 denotes a light source lamp having a reflecting mirror 21a at a rear portion thereof. An integrator 22 equalizes the illumination light. 2
Reference numeral 3 denotes a first dichroic mirror for color separation. 2
Reference numeral 4 denotes a red first total reflection mirror (or dichroic mirror) whose reflected light is reflected by a condenser lens 25a to be described later.
Is incident on. The light source lamps 21 to the first total reflection mirror 24 are arranged on one side in parallel with the projection optical axis in the projector device P.

Reference numerals 25a, 25b, and 25c denote condenser lenses. The lens 25b is located on the projection optical axis at the center of the projector P, and the lenses 25a and 25c project on an optical path orthogonal to the projection optical axis. They are located on both sides of the optical axis. Reference numerals 26a, 26b, and 26c denote liquid crystal panel units including a registration adjusting mechanism, which are disposed in front of the condenser lenses 25a, 25b, and 25c, respectively.
Reference numeral 27 denotes a second dichroic mirror which is arranged on the projection optical axis so as to face the first dichroic mirror 23, and directs the reflected light toward the condenser lens 25b. The second
The light beam that has passed through the dichroic mirror 27 is incident on a second total reflection mirror 29 via a relay lens 28 disposed on the other side in the projector device P, and is further transmitted via a relay lens 30 and a third total reflection mirror 31 to the condenser. The light is incident on the lens 25c. Reference numeral 32 denotes a cross dichroic prism, and the liquid crystal panel portions 26a,
It is arranged on the projection optical axis at the center so as to face 26b, 26c, and synthesizes color-separated light flux. A projection lens 33 is disposed in front of the cross dichroic prism 32 and projects a light beam synthesized by the cross dichroic prism 32 onto a screen. When the projection lens 33 and the projection combining optical system (portion indicated by a black frame) including the second dichroic mirror 27 disposed at the rear thereof are not integrally used, they slide so as to be housed in the projector apparatus P. When the image is projected, the moving amount A projects from the front surface of the projector device P.

A lamp cooling fan 34 is located behind the light source lamp 21. Numeral 35 denotes a cooling fan for the liquid crystal panel side, which includes the first dichroic mirror 23 and the first cooling fan.
A lamp power supply 36 disposed outside the total reflection mirror 14 is disposed below the projection lens 33. Reference numeral 37 denotes a driving substrate for the liquid crystal projector device, which is arranged on the upper side in the projector device P.

In this embodiment having the above structure, the light from the light source lamp 21 is made uniform by the integrator 22, and the uniformed illumination light is supplied to the first dichroic mirror 23.
Transmits red light, and reflects green light and blue light. The transmitted red light is reflected by the first total reflection mirror 24 and is incident on the liquid crystal panel 26a via the condenser lens 25a. On the other hand, the green light and the blue light reflected by the first total reflection mirror 24 are transmitted by the second dichroic mirror 27, and the green light is reflected by the condenser lens 25b.
The blue light incident on the liquid crystal panel 26b through the second dichroic mirror 27 through the relay lens 28,
After passing through the second total reflection mirror 29, the relay lens 30, and the third total reflection mirror 31 sequentially, the condenser lens 25c
When the light enters the liquid crystal panel unit 26c via the LCD, the respective color lights are combined by the cross dichroic prism 32, and an image is projected on a screen by the projection lens 33. In the non-projection state of the projector device P, the projection lens 33 and the projection combining optical system move to the space of the length A 'in the device by the movement amount A (<
A ') moves in the direction of the arrow and is stored. In this embodiment, the black frame portion of the projection combining optical system shown in FIG.
a and 25c may be moved.

Next, a block diagram of an electric circuit for operating the projector device of the present embodiment will be described with reference to FIG. In the figure, reference numeral 41 denotes a microcomputer, and reference numeral 42 denotes a light source lamp, which corresponds to the lamp 21 in FIG. A liquid crystal driving circuit 43 is controlled by a signal from the microcomputer 41, and has a liquid crystal display section 44 (liquid crystal panel sections 26a, 26b, 26c in FIG. 1).
(Equivalent to). Reference numeral 45 denotes a drive circuit of the motor 46, which is controlled by a signal from the microcomputer 41. Reference numeral 47 denotes a projection lens which corresponds to the projection lens 33 in FIG. Reference numeral 48 denotes a position detection unit for detecting the position of the projection lens 47 in the projection state, and the detection signal is input to the microcomputer 41.

Reference numeral 49 denotes a cooling fan, which is a fan 3 shown in FIG.
4 and 35, the operation of which is controlled by the microcomputer 41. Reference numeral 50 denotes a temperature detection unit having a temperature sensor for detecting the temperature inside the apparatus main body. The detection signal controls the operation of the fan 49 and the driving circuit 52 of the projection lens 47. Reference numeral 51 denotes a position detection unit that detects a position other than the projection state of the projection lens 47, and a detection signal thereof is input to the microcomputer 41. A light source switch 53 is connected to the drive circuit 52.

The operation of the block circuit for the above operation will be described with reference to the flowchart of FIG. First, in step 1, the storage section drive circuit is turned on. In step 2, the drive circuit 45 operates, and the process proceeds to step 3. In step 3, the projection lens 47 moves from the storage section to the projection position, and proceeds to step 4. In step 4, the position detection unit 48 detects whether the projection lens 47 has moved to the projection position. If the projection lens 47 has not moved to the projection position, the process returns to step 2, and if it has moved, the process proceeds to step 5.

In step 5, the temperature in the apparatus is detected by the temperature detecting section 50. If the temperature is lower than the predetermined temperature, the process proceeds to step 8. If the temperature is higher than the predetermined temperature, the process proceeds to step 6. The fan 45 operates for a predetermined time and stops, and then proceeds to step 7. In step 7, the microcomputer 4
The light source lamp 42 is turned on by the control of 1, and the process proceeds to step 8. In step 8, the liquid crystal drive circuit 43 operates, and the process proceeds to step 9. In step 9, liquid crystal display is performed by the liquid crystal display unit 44, and in step 10, an image of the liquid crystal display is projected by the projection lens 47. When the image projection operation is completed in step 11, the process proceeds to step 12.

In step 12, under control of the microcomputer 41, the driving circuit 45 causes the projection lens 47 to be stored in the storage section in the apparatus.
When the projection combining optical system including the above moves and the position detection unit 51 detects the position detection in the non-projection state, the drive switch is turned off.

[0016]

As described above, according to the present invention, there is provided a projection display apparatus in which the relative positions of the projection combining optical system and the illumination system are different between the time of projection and the time of non-projection. A position detection unit in a state of being housed in the apparatus of the projection synthesis optical system, a control unit for turning off the light source, and a cooling fan for the light source and the main unit. When the operation ends in the projection state and the position detection unit detects the storage state of the projection synthesis optical system, the light source switch is turned off by the control unit, so that the apparatus can be downsized and the thermal effect on the apparatus body can be reduced. And wasteful power consumption can be avoided. The present invention according to claim 2 performs position detection other than the projection state, and has control means for turning on the light source. When the position detection unit detects the position in the projection state, the cooling fan operates for a predetermined time before the light source is turned on. By doing so, it is possible to suppress the thermal influence on the apparatus main body and to avoid wasteful power consumption. According to a third aspect of the present invention, a temperature sensor is provided as a detecting means, and the timing of turning on / off the switch of the cooling fan is optimized under a constant temperature condition, thereby suppressing a thermal influence on a product body. Can be.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an arrangement of a main part of a liquid crystal projector device according to an embodiment of the present invention.

FIG. 2 is a side view of the main part.

FIG. 3 is a block diagram of an electric circuit for explaining an operation for that.

FIG. 4 is a flowchart illustrating the operation.

FIG. 5 is a configuration diagram showing the structure of a conventional dichroic prism type liquid crystal projector device.

[Explanation of symbols]

Projector device 21 Light source lamp 22
..Integrator, 23.first dichroic mirror, 24.first total reflection mirror, 25a, 25b, 25
c condenser lens, 26a, 26b, 26c
Liquid crystal panel, 27 dichroic mirror, 2
8, 30 relay lens, 29 second total reflection mirror, 31 third total reflection mirror, 32 cross dichroic prism, 33 projection lens, 34 cooling lamp side, 35 LCD panel cooling fan, 3
6, lamp power supply, 37, liquid crystal projector drive board, 41, microcomputer (control means), 48, projection position detection unit, 50, temperature detection unit, 51, non-projection position Detection unit.

Claims (3)

[Claims] 1. A projection display device in which the relative positions of a projection combined optical system and an illumination system are different between during projection and during non-projection, wherein the projection display device is housed in the projection combined optical system during non-projection. A position detection unit, a control unit for turning off the light source, and a cooling fan for the light source and the main unit. Cooling of the light source and the main unit by the cooling fan ends in the projection state, and the position detection unit performs the projection synthesis. The projection display device, wherein when the storage state of the optical system is detected, the control unit turns off the light source switch. 2. A position detection unit in a projection state and a control unit for turning on a light source. When the position detection unit detects a position in the projection state, the cooling fan operates for a predetermined time before the light source is turned on. The projection display device according to claim 1, wherein: 3. The projection display device according to claim 1, further comprising a temperature sensor as a detecting means, wherein the on / off timing of a switch of the cooling fan is optimized under a constant temperature condition. .