JP2012108216A - Projector device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in which: a lamp of a projector device takes long time to obtain sufficient brightness at the time of lighting and once the lamp lights out it takes long time to be relighted on, so the lamp is often used in a state of being continuously lighted; and if the lamp is used in low power mode for power saving, the screen becomes dark.SOLUTION: In a projector device 10, brightness of peripheral environment of the projector device 10 is detected with a peripheral illuminance detection circuit 21. Whether the projector device 10 is a video display state or not is recognized. A lamp drive control circuit 15 is controlled according to brightness of peripheral environment of the projector device 10 and a video display state to control power of a lamp 11.

Description

  The present invention relates to a projector apparatus that projects an image represented by a video signal on a screen by transmitted light or reflected light obtained by irradiating light from a light source to a video display device driven based on the video signal.

  In recent years, with the widespread use of video disc players and the like, there is an increasing demand for large-screen video display devices capable of displaying powerful video on a large screen. As a large-screen video display device, for example, there is a projector device that is a projection-type video display device, and there is a method of displaying a large-screen video by combining the projector device and a screen.

  A high-pressure mercury lamp or the like is used as a light source used in the projector apparatus, but these lamps require a time of about several minutes from the start of supplying power to the lamp until reaching a sufficient brightness. . In addition, once the lamp is turned off, it is difficult to be turned on again for several tens of seconds to several minutes until the temperature of the lamp is sufficiently lowered.

  Therefore, when using a projector device, the lamp is always lit and used in many cases. However, since the lamp alone consumes a large amount of power exceeding 100W to 300W, it is a new means for promoting power saving. Development is demanded.

  As a conventional method for reducing the power of the projector apparatus, there is a method of reducing power consumption by lowering the power supplied to the lamp and lighting in the low power mode. FIG. 5 is a configuration diagram showing an example of the configuration of a conventional projector apparatus.

  In FIG. 5, 10 is a projector device, 11 is a lamp as a light source, 12 is a video display device for displaying an image, 13 is a projection lens, 14 is a screen for capturing an image, and 15 supplies power to the lamp 11. A lamp drive control circuit for turning on the light, 16 a video signal processing circuit for processing the video signal and displaying the video on the video display device 12, 17 a microcomputer for controlling the operation of the projector device 10, Is a power changeover switch for switching the power supplied to the lamp 11 by the lamp drive control circuit 15.

  The operation of the conventional projector apparatus configured as shown in FIG. 5 will be described. The lamp drive control circuit 15 turns on the lamp 11 by a control signal from the microcomputer 17. The microcomputer 17 monitors the state of the power switch 18 and controls the lamp drive circuit 15 according to the state of the power switch 18 to switch the power supplied to the lamp 11 between the high power mode and the low power mode.

  In the conventional projector apparatus as shown in FIG. 5, the power supplied to the lamp is switched by manually setting the power switch 18 to control the power supplied to the lamp according to the state of the projector apparatus. A method for promoting power saving has also been proposed. For example, Patent Document 1 proposes a method in which a human sensor is provided to control power supplied to a lamp in accordance with the presence of a person around the projector apparatus. .

  Patent Document 2 proposes a method of controlling the power supplied to the lamp according to the screen size in conjunction with the operation of the projection optical system.

JP 2010-197440 A JP 2003-29341 A

  However, the method of lighting by switching the power supplied to the lamp manually to the low power mode as in the conventional projector apparatus is effective in terms of power saving because the lamp is always lit in the low power mode. When using in a bright environment, there is a problem that the image becomes difficult to see clearly because the screen becomes dark.

  As for other proposals of the conventional projector apparatus, the lamp power does not enter the low power mode when a person is always watching or displaying on a large screen.

  The present invention is to solve the above-described conventional problems, and in the projector apparatus, by controlling the power supplied to the lamp as the light source according to the ambient illuminance and usage state of the apparatus, the image quality of the projected image is not impaired. An object of the present invention is to provide a projector device that can save power.

  In order to solve the above-described conventional problems, a projector device of the present invention includes a peripheral illuminance detection unit that detects the brightness of the surrounding environment of the projector device, a state detection unit that detects the state of the projector device, and the peripheral illuminance A light source power control unit that controls the power of the light source according to the detection results of the detection unit and the state detection unit.

  As described above, in the projector device of the present invention, power saving can be achieved without impairing the projected image quality by controlling the power of the light source according to the brightness of the surrounding environment of the projector device. In addition, it is possible to further reduce power consumption by controlling the power of the light source according to the state of the projector device, which is whether or not it is in the video display state.

1 is a configuration diagram for explaining the operation of a projector apparatus according to a first embodiment of the invention. 6 is a flowchart for explaining a lamp power control method based on ambient illuminance of the projector apparatus according to the first embodiment of the invention. The graph which showed the threshold level which switches the lamp electric power of the projector apparatus which concerns on Example 1 of this invention. 7 is a flowchart for explaining a lamp power control method according to an image display state of the projector apparatus according to the first embodiment of the invention. Configuration diagram showing an example of a conventional projector device

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

Example 1
FIG. 1 is a configuration diagram illustrating an example of a configuration of a projector device according to a first embodiment of the invention. The same components as those in the example of the conventional projector apparatus shown in FIG.

  In FIG. 1, 10 is a projector device, 11 is a lamp as a light source, 12 is an image display device for displaying an image, 13 is a projection lens, 14 is a screen, and 15 is for supplying power to the lamp 11 to light it. 16 is a video signal processing circuit for processing the video signal to display the video on the display device 12, 17 is a microcomputer for controlling the operation of the projector device 10, 20 is a control switch, and 21 is a control switch. 2 is a peripheral illuminance detection circuit for detecting the peripheral illuminance of the projector device 10.

  The operation of the projector apparatus configured as described above will be described.

  The ambient illuminance detection circuit 21 is attached to the projector device 10, detects illuminance that is the brightness of the surrounding environment where the projector device 10 is installed, and transmits an illuminance signal to the microcomputer 17. The microcomputer 17 can recognize the illuminance of the surrounding environment where the projector apparatus 10 is installed by this illuminance signal. The microcomputer 17 compares the detected illuminance of the surrounding environment with a preset illuminance threshold level, and controls the lamp drive control circuit 15 according to the illuminance of the surrounding environment to supply power supplied to the lamp 11 to the lamp 11. Control is performed by switching between a high power mode (hereinafter referred to as “high”) in which the brightness is bright and a low power mode (hereinafter referred to as “low”) in which the brightness is slightly dark. Further, the power supplied to the lamp 11 is also controlled according to the state of the projector device 10 such as whether or not the video signal is in the mute state. The control switch 20 is a switch for setting a power control state, and the control switch 20 can set the power control of the lamp 11 to ON / OFF.

  FIG. 2 is a flowchart for explaining an example of a lamp power control method based on ambient illuminance of the projector apparatus according to the first embodiment of the invention.

  When the power control of the lamp 11 based on the ambient illuminance of the projector device 10 is turned on by the control switch 20, once the projector device 10 is activated, the lamp power is once set to “high” (step S11). Thereafter, the process proceeds to ambient illuminance detection (S12) in a state where the power is “high” or “low” by the steps described below.

  When the ambient illuminance detection circuit 21 detects the ambient illuminance of the projector device 10 (step S12), the control branches depending on the current lamp power state (step S13). When the current lamp power is “low”, it is determined whether or not the detected ambient illuminance is equal to or higher than the upper threshold level L2 (step S14), and when it is higher than the threshold level L2, the lamp power is switched to “high”. (Step S15). On the other hand, if the current lamp power is “high” in step S13, it is determined whether the detected ambient illuminance is lower than the lower threshold level L1 (step S16), and if it is lower than the threshold level L1, the lamp power is determined. Is switched to “low” (step S17).

  FIG. 3 is a graph showing a threshold level for switching the lamp power of the projector apparatus according to Embodiment 1 of the present invention.

  As shown in FIG. 3, the threshold level at which the lamp power is switched according to the ambient illuminance is provided with a lower threshold level L1 and an upper threshold level L2, and by providing hysteresis for switching the lamp power, Eliminates the problem that screen brightness changes frequently due to chattering during switching.

  In the power control method for the lamp 11 shown in the present embodiment, an example in which the lamp power is switched between two stages of “high” and “low” is shown, but the number of lamp power switching stages is not limited to this. Absent.

  In the projector device according to the present invention, not only the lamp power is switched according to the ambient illuminance detected by the ambient illuminance detection circuit 21, but also depending on the relationship between the ambient illuminance and the state of the projector device whether the projector device is displaying an image. Also controls the lamp power.

  FIG. 4 is a flowchart for explaining a lamp power control method according to the video display state of the projector apparatus according to the first embodiment of the invention.

  The lamp power is set according to the flowchart of the lamp power control based on the ambient illuminance shown in FIG. 2 (step S21). The microcomputer 17 confirms whether or not the projector device is set to a video mute state in which no video is displayed (step S22), and when the lamp power is “high” according to the set lamp power (step S23). Switches the lamp power to “low” (step S24). If the video mute state is canceled in step S22, the lamp power is switched to “high” or “low” according to the ambient illuminance detected in step S21 (step S25).

  When the projector device is in a video mute state in which the video display is temporarily suspended, since the video is not displayed, it is effective to save power by setting the lamp power to “low”. In addition, even if the projector device is in the video mute state, the light emitted from the projector device is not completely blocked, and some light leaks, so the lamp power should be set to “low” from the viewpoint of reducing the leaked light. Is effective.

  As described above, the projector device is configured to control the power of the lamp in accordance with the state of the device in addition to the brightness around the projector device, so that it has a great effect on power saving of the projector device. .

  The projector device according to the present invention is provided with a peripheral illuminance detection circuit to control the power supplied to the lamp according to the peripheral illuminance of the projector device, and also to the lamp according to the state of the projector device whether it is in the video mute state Combining the control of the power to be supplied is effective for power saving of the projector device.

DESCRIPTION OF SYMBOLS 10 Projector apparatus 11 Lamp which is light source 12 Image display device for displaying image 13 Projection lens 14 Screen 15 Lamp drive control circuit for supplying power to lamp 11 and lighting it 16 Display device 12 by processing image signal Video signal processing circuit for displaying an image on the microcomputer 17 Microcomputer for controlling the operation of the projector device 20 Control switch 21 Ambient illuminance detection circuit for detecting the ambient illuminance of the projector device 10

Claims (3)

A projector device that projects an image represented by a video signal on a screen by transmitted light or reflected light obtained by irradiating light from a light source to at least one video display device driven based on the video signal. ,
A peripheral illuminance detector that detects the brightness of the surrounding environment of the projector device;
A state detector for detecting the state of the projector device;
A projector apparatus comprising: a light source power control unit that controls power of the light source according to detection results of the peripheral illuminance detection unit and the state detection unit.   The projector device according to claim 1, wherein the light source power control unit controls the power of the light source in a stepwise manner, and controls the power with hysteresis with respect to a change in brightness of the surrounding environment.   The light source power control unit sets the power of the light source in the high power mode according to the detection result of the ambient illuminance detection unit, and when the detection result of the state detection unit is a video mute state, The projector apparatus according to claim 1, wherein the power is set to a low power mode.

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