JP2018031933A - Projection display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection display device that, even when a diaphragm mechanism or a light source lamp malfunctions or fails, can reliably detect an error without upsizing, complication, an increase in cost.SOLUTION: A projection display device comprises: a light source lamp that can adjust the intensity of light emission; light blocking means that is arranged in a light path from the light source lamp and is opened/closed to block light from the light source; and illuminance measuring means that can measure an illuminance corresponding to a projection image during projection. The illuminance measuring means is arranged at a portion spatially separated from the light blocking means, and the projection display device detects open/close of the light blocking means from illuminance data measured by the illuminance measuring means.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a projection display device, and more particularly to opening / closing detection of a diaphragm mechanism.

  Conventionally, it has been difficult to quickly reduce the light source lamp to a dimmed state or to return from a greatly dimmed state to a non-dimmed state in a short time. However, in recent years, this has become possible with the development of light source lamps and control technology. As a result, even when the brightness is high, the opening and closing of the aperture mechanism and the dimming of the light source lamp are used together (to reduce the temperature rise), and the projection is interrupted for a long time without turning off the lamp. It is possible to resume the projection.

  For example, in Patent Document 1, a second diaphragm made of a material having higher heat resistance than the first diaphragm is arranged in the front stage in the incident direction of the first diaphragm, and the first diaphragm blades are protected from a light beam having a high luminance. Proposals are disclosed.

JP 2012-1113015 A

  When the diaphragm mechanism or the light source lamp malfunctions or breaks down, the diaphragm mechanism or the light source lamp becomes hot, and monitoring with a sensor is essential. The sensor must be installed at an appropriate location in one step so that it does not fail at the same time due to heat generation due to malfunction or failure of the aperture mechanism or light source lamp. Problem solving techniques have been sought because of increasing cost, complexity and cost.

  However, in the prior art disclosed in the above-mentioned patent document, the diaphragm mechanism itself can be protected, but there is no mention of malfunction detection or failure detection, and it cannot be said that it is a sufficient countermeasure.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a projection display device that can detect errors with high probability without increasing the size, complexity, and cost even when an aperture mechanism or a light source lamp malfunctions or fails. It is.

In order to achieve the above object, the present invention provides a light source lamp capable of adjusting emission intensity,
A light shielding means arranged in the middle of the optical path and shields light from the light source by opening and closing;
Illuminance measuring means arranged in the apparatus and capable of measuring the illuminance corresponding to the projected image during projection,
In a projection display device having
The illuminance measuring means is arranged at a place spatially isolated from the light shielding means,
Detecting the opening and closing of the light shielding means from the illuminance data measured by the illuminance measuring means;
It is characterized by.

  According to the present invention, it is possible to provide a projection display device that can increase the probability that an error can be detected without an increase in size, complexity, and cost even when a diaphragm mechanism or a light source lamp malfunctions or fails. Can do.

Flow chart for explaining the present embodiment Required unit excerpt schematic diagram in the projection display device for explaining the present embodiment

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a flowchart illustrating an embodiment of the present invention. FIG. 2 is a diagram showing a projection display device according to the embodiment of the present invention.

  1 is a light source lamp. 2 is an aperture that blocks the light emitted from the light source 1 by opening and closing. A motor 7 is a driving means for opening and closing the diaphragm 2. 11A, 11B, and 11C are liquid crystal display elements for generating an arbitrary image, and there are a total of three for red, blue, and green. 6 is a projection lens for projecting the generated image. 10A, 10B, and 10C decompose the light emitted from the light source lamp 1 into three colors of red, blue, and green, and irradiate the liquid crystal display elements 11A, 11B, and 11C, and the liquid crystal display elements 11A, 11B, and 11C Prism for combining light. Reference numeral 12 denotes a dichroic mirror for dispersing light emitted from the light source lamp 1.

  An illuminance detection sensor 3 detects the light intensity from the light source and is also used for flicker correction of the liquid crystal display element. The illuminance detection sensor 3 detects illuminance every arbitrary time. Reference numeral 9 denotes an illumination optical system unit for storing the light source lamp 1 and optical parts (not shown), and uniformizing the emitted light to irradiate the liquid crystal display elements 11A, 11B, and 11C. A color separation / combination optical system unit 5 stores the dichroic mirror 12, prisms 10A, 10B, and 10C, liquid crystal display elements 11A, 11B, and 11C, and the illuminance detection sensor 3. Reference numeral 8 denotes a light source lamp driving detection sensor for detecting the driving state of the light source lamp. 4 is a storage device for storing the relationship between the driving state of the light source lamp and the illuminance detection sensor.

[Example]
Hereinafter, embodiments of the present invention will be described with reference to FIGS. The flow of this example
Step1: While projecting the projection display device, the user issues a command to suspend projection without turning off the lamp.
Step 2: The light source lamp 1 is dimmed to about 20% of the output compared to the normal lighting state.
Step 3: The diaphragm 2 is closed in the optical path by the motor 7 to block the light emitted from the light source lamp 1.

Step 4: The light source lamp drive detection sensor 8 detects whether the light source lamp 1 is driven as instructed. Specifically, a temperature proportional to the output difference is detected by a temperature sensor.
Step 5: The illuminance is detected by the illuminance detection sensor 3. The illuminance sensor 3 is usually a sensor that detects illuminance for flicker correction of the liquid crystal panel 11, and this illuminance is detected by this sensor when an instruction is given to temporarily stop projection without turning off the lamp. The illuminance sensor 3 is disposed in the color separation / synthesis optical system unit 5 and facing the prism 10C, and is disposed in a separate space separated from the illumination optical system unit 9 in which the diaphragm 2 is disposed. It is hard to be affected by heat.

Step 6: The detection result from the light source lamp drive detection sensor 8, the detection result from the illuminance detection sensor 3, and the data stored in the storage device 4 are collated. The stored data indicates a table in which the relationship between the temperature data of the light source lamp drive detection sensor 8 and the illuminance data of the illuminance detection sensor 3 is recorded in advance. In the collation, it is determined whether the detection result of the illuminance sensor 3 is an arbitrary illuminance stored in advance with respect to the detection result of the light source lamp drive detection sensor 8.
Step 7: In step 6 above, it is determined whether the stored information matches the acquired data.

Step 8: When the above conditions are met, the dimming of the light source lamp 1 and the open / close state of the diaphragm 2 are continued. Step9: If not matched in Step7 above, open the aperture.
Step10: Display error. Specifically, an error may be displayed on the projection screen, or an error may be displayed by turning on the main body lamp.

  With this configuration, it is possible to detect the opening / closing of the diaphragm with the illuminance detection sensor 3 for flicker adjustment of the liquid crystal panel 11 that is originally installed, so that it is not necessary to provide new detection means. Also, since the illuminance detection sensor 3 is arranged in the color separation / synthesis system unit 5, it is arranged spatially separated by the diaphragm 2 arranged in the illumination optical system unit 9 and the parts, so that the heat at the time of failure The opening and closing status can be detected reliably without being affected by the effects.

  Furthermore, since the detection means can be arranged at a location that is not thermally affected, there is no additional configuration or parts for avoiding the originally required thermal influence, and the set is not enlarged.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

1-Light source lamp. 2- Aperture. 3- Illuminance detection sensor. 4- Storage device. 5-color separation and synthesis optical system unit. 6-projection lens. 7-motor. 8-light source lamp drive detection sensor. 9-illumination optics unit. 10-prism. 11-Liquid crystal display element. 12-dichroic mirror.

Claims (3)

A light source lamp with adjustable emission intensity,
A light-shielding means arranged in the optical path from the light source lamp and shielding light from the light source by opening and closing;
Illuminance measuring means capable of measuring the illuminance corresponding to the projected image during projection;
In a projection display device having
The illuminance measuring means is arranged at a place spatially isolated from the light shielding means,
Detecting the opening and closing of the light shielding means from the illuminance data measured by the illuminance measuring means;
Projection display device characterized by. In the projection display device according to claim 1,
The projection display device has a prism for separating and synthesizing light from the light source lamp,
The illuminance measuring means is disposed at a position facing a surface parallel to the light incident surface of the prism,
Projection display device characterized by. In the projection display device according to claim 1 or 2,
Having a liquid crystal display for generating any image,
The illuminance measuring means also serves as illuminance measurement for flicker correction of the liquid crystal display device,
Projection display device characterized by.