JP2002278508A - Image display device - Google Patents

Abstract

(57) [Problem] In a matrix type image display device using a lamp as a light source, even if the power switch of the main body or a remote controller is operated by mistake and the power supply of the device is cut off,
If the power is turned on again, the screen display can be restored without waiting time. An image display device comprising a power switch and a light source, wherein when the power switch is closed, an image corresponding to an input video signal is formed by the light source and displayed on a screen. When it is detected that the power switch is opened during the normal operation (a), when the video signal is continuously input, the display on the screen is turned off while the light source is kept on (b), and the video signal is turned off. When no is input, the display on the screen is turned off and the light source is turned off.
Thereafter, when the power switch is closed (f), the screen display is resumed (h).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a matrix type image display device using a lamp as a light source, such as a DMD or a liquid crystal display device.

[0002]

2. Description of the Related Art FIG. 6 is a timing chart of an operation related to a power supply of a conventional matrix type image display device using a lamp such as a DMD or a liquid crystal display device as a light source. This timing chart shows the operation timing of the power switch of the apparatus main body, the presence or absence of image display on the screen, the lighting state of the light source lamp of the apparatus, and the state of the apparatus.

In FIG. 6, when a user operates a power switch or a remote controller of the main body to turn off the power of the image display device in a normal operation (a), the screen display is turned off (b), and the lamp is turned off ( c), the device is turned off (d). When a predetermined lamp cooling period has elapsed, the apparatus shifts to a standby state waiting for a next power-on instruction.

In the standby state, when the user turns on the power by operating the power switch or the remote controller of the main body (f), the apparatus is turned on and starts to be started (e), and after a certain period of time, the lamp is turned on. Lights up (g),
An image is displayed on the screen (h).

[0005]

As described above, in a conventional matrix type display device using a lamp as a light source, such as a DMD or a liquid crystal display device, the power is shut off by a power switch or a remote controller of the main body during operation. At the same time, the screen turns off and the lamp goes off.

A lamp generally used as a light source in a matrix type display device or the like is normally prohibited from being turned on again for a certain period of time after power is turned off for cooling in order to assure its characteristics, and is displayed on a screen during that period. The display cannot be displayed. Therefore, if the user of the image display device accidentally operates the power switch or remote control of the main unit and turns off the power unintentionally, even if the user turns on the power immediately after that, a certain amount of lamp cooling There is a problem that the display cannot be displayed on the screen after a certain period.

The present invention has been made in order to solve the above-mentioned problem, and is intended to be used even when a user accidentally operates a power switch or a remote controller of the main body to shut off a power supply of an image display apparatus. It is another object of the present invention to provide an image display device in which the screen display is restored without a waiting time when the power is turned on again as long as a signal is input to the device.

[0008]

According to a first aspect of the present invention, there is provided a power switch and a light source, and when the power switch is closed, an image corresponding to an input video signal is formed by the light source. An image display device for displaying on a screen by means of a first detection means for detecting whether or not the power switch is closed; a second detection means for detecting whether or not a video signal is input; Control means for controlling display of an image on a screen and lighting of the light source in accordance with the detection results of the first and second detection means, and in a state where an image is displayed on the screen, When the first detecting means detects that the power switch is opened,
When the second detecting means detects that the video signal is continuously input, the control means turns off the display of the screen while maintaining the light source in a lighting state, and the video signal is input. When the second detecting means detects that the display is not performed, the display on the screen is turned off and the light source is turned off.

According to a second aspect of the present invention, when the first detecting means detects that the power switch is closed after the display of the screen is turned off while the light source is maintained in the lighting state. The control means restarts the screen display.

According to a third aspect of the present invention, there is provided an image display apparatus comprising a power switch and a light source, wherein when the power switch is closed, an image corresponding to an input video signal is formed by the light source and displayed on a screen. In the display device, first detection means for detecting whether the power switch is closed,
Second detection means for detecting whether a video signal is input, and control for controlling display of an image on the screen and lighting of the light source in accordance with detection results of the first and second detection means Means, the control means, in a state where the power switch is open and the light source is turned off,
When the second detection means detects that the input of the video signal has been resumed, the image display device is automatically activated and the light source is automatically turned on. After the lighting, the power switch is closed. When the first detecting means detects that the screen has been displayed, the screen display is restarted.

According to a fourth aspect of the present invention, a power switch and a light source are provided, and when the power switch is closed, an image corresponding to an input video signal is formed by the light source and displayed on a screen. An image display device, comprising: a detection unit that detects whether the power switch is closed; and a control unit that controls display of an image on the screen according to a detection result of the detection unit. In a state where an image is displayed above, the control unit, when the detection unit detects that the power switch is opened,
The display of the screen is turned off while the light source is kept turned on, and after the display of the screen is turned off, the screen display is restarted when the detection unit detects that the power switch is closed. I do.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings showing the embodiments. Embodiment 1 FIG. 1 and 2 are timing charts of operations related to the power supply of the image display device according to the first embodiment of the present invention. This timing chart shows the timing of the operation of the power switch of the apparatus main body, the presence or absence of an image display on the screen, the lighting state of the light source lamp of the apparatus, the change in the state of the apparatus, and the presence or absence of signal input to the apparatus. I have.

First, referring to FIG. 1, the apparatus according to the first embodiment in the case where the input of the video signal to the apparatus is continued from the time when the power is turned off by turning on the power switch or the remote control to the time when the power is turned on again Will be described.

During normal operation of the image display device, the user
When the power supply of the apparatus is turned off by operating the power switch or the remote controller of the main body (a), the apparatus checks whether there is an input signal. If there is an input signal, the device turns off the display on the screen (b), but the lamp, which is the light source of the device, continues to be turned on without being turned off, and enters a standby period.

During the standby period, when the user turns on the power again by operating the power switch or the remote controller of the main body (f), the display device resumes the screen display (h). In this case, since the lamp is continuously turned on, the lamp cooling period is unnecessary, and the screen display is immediately restored.

Next, referring to FIG. 2, after the power is turned off, the signal input to the apparatus is temporarily stopped, and then, when the signal input is restarted, the power is turned on again by the user's operation. The operation of the device of Embodiment 1 will be described.

When the user operates the power switch of the main body or the remote controller or the like to shut off the power during the normal operation of the image display apparatus (a), the apparatus checks for an input signal. If there is an input signal, the device turns off the display on the screen (b), but enters a standby period in which the lamp, which is the light source of the device, continues to be turned on without being turned off.

After a lapse of a predetermined time from the start of the standby period, the image display device checks for an input signal. When it is detected that the input signal has disappeared (i), the lamp which is the light source of the device is turned off (c), the device is turned off (d), and the lamp enters a lamp cooling period. At the end of the lamp cooling period, the device automatically transitions to the standby state.
After the transition to the standby state, the input of the signal to the device is restarted (j).

In this state, when the user turns on the power by operating the power switch or the remote controller of the main body (f), the apparatus is turned on to start the operation (e),
The lamp is turned on (g) and the screen display is resumed (h).

FIG. 3 is a flowchart showing the operation of the image display apparatus of the first embodiment in more detail. During normal operation of the image display device (step S1), when the user performs a power-off operation using a power switch or a remote controller of the main body (step S2), the device deletes the display on the screen (step S3). The presence or absence of an input signal to the device is checked (step S4).

In step S4, it is determined that the signal is continuously input, and if the power is turned on again within a predetermined time (steps S15 and S16), the screen display is immediately resumed (step S15). (Step S13), the operation returns to the normal operation state (Step S14).

If it is determined in step S16 that the predetermined time has elapsed without the power-on operation being performed, the flow returns to step S4 to check whether a signal has been input to the apparatus. Here, if it is determined that there is no input signal, the lamp is turned off (step S5) and lamp cooling is started (step S6).

Thereafter, in step S7, it is checked whether or not a power-on operation has been performed using a power switch of the main body or a remote controller. If it is determined that the power-on operation has been performed, after the lamp cooling period has elapsed, (Step S9), the lamp is turned on (Step S12), and screen display is started (Step S9).
13), return to the normal operation state (step S14).

If it is determined in step S7 that there is no power-on operation, after the elapse of the lamp cooling period (step S8), a transition is made to the standby state (step S1).
0). Thereafter, it is checked whether or not the power is turned on again by a power switch or a remote controller, and the standby state is continued until the power is turned on again (step S11). When the power is turned on, the lamp is turned on. (Step S1
2) Restart the screen display (step S13), and return to the same normal operation state as step S1 (step S1)
4).

According to the configuration of the first embodiment, the DM
In a matrix-type image display device such as D or a liquid crystal display device using a lamp as a light source, if a user accidentally operates a power switch or a remote controller of the main body and shuts off the power during operation of the device, a signal is sent to the device. As long as is input, the screen display can be instantaneously restored when the power is turned on again, so that the operability of the apparatus is greatly improved.

Embodiment 2 FIG. FIG. 4 is a timing chart of an operation related to the power supply of the image display device according to the second embodiment of the present invention. As in the timing charts of FIGS. 1 and 2, the timing chart includes the timing of the operation of the power switch of the apparatus main body, the presence or absence of an image display on the screen, the lighting state of the light source lamp of the apparatus, the change of the state of the apparatus, and the operation of the apparatus. The presence or absence of the signal input is shown.

The operation of the apparatus according to the second embodiment will be described below. During normal operation of the image display device, when the user operates the power switch or the remote controller of the main body to turn off the power (a), the device checks for an input signal. If there is an input signal, the device turns off the display on the screen (b), but the lamp that is the light source of the device continues to be turned on without being turned off, and enters a standby period. During the waiting period, the device continues to check for an input signal at regular time intervals.

When it is detected that the input signal has disappeared (i), the lamp which is the light source of the apparatus is turned off (c), the apparatus is turned off (d), and the lamp enters a lamp cooling period. After a certain lamp cooling period, the device automatically goes into a standby state.

In this standby state, when it is detected that the signal input has been resumed (j), the apparatus is turned on and automatically started (e), and the lamp is automatically turned on (g). Here, when the user turns on the power by operating the power switch or the remote controller of the main body (f), the screen display is immediately resumed without waiting for the lamp to be turned on (h).

According to the configuration of the third embodiment, the DM
In a matrix type image display device such as D or a liquid crystal display device using a lamp as a light source, when a user operates a power switch or a remote controller of the main body and shuts off the power supply during operation of the device, a signal is input to the device. If this is done, the device will automatically start up from standby mode, the lamp will automatically turn on, and then the power will be turned on, and the image will be displayed on the screen instantly, greatly improving the operability of the device. improves.

Embodiment 3 FIG. 5 is a timing chart of an operation related to the power supply of the image display device according to the third embodiment of the present invention. This timing chart shows the operation timing of the power switch of the apparatus main body, the presence or absence of image display on the screen, the lighting state of the light source lamp of the apparatus, and the change of the state of the apparatus.

The operation of the device according to the third embodiment will be described below. When the user operates the power switch or the remote controller of the main body to turn off the power during the normal operation of the image display apparatus (a), the apparatus shifts to a standby state waiting for the next power-on instruction. In this state, the display on the screen of the apparatus is erased (b). On the other hand, the lamp which is the light source of the device continues to be turned on, and the device maintains the ON state.

In this standby state, when the user turns on the power by operating the power switch or the remote controller of the main body, the screen display is immediately restarted without going through the conventionally required lamp lighting operation.

According to the configuration of the third embodiment, the DM
In a matrix-type image display device using a lamp as a light source, such as a D or liquid crystal display device, when a user operates a power switch or a remote controller to turn off the power during operation of the device, the device displays a screen. Is turned off, but the lamp shifts to the standby state with the light on, so that the image is displayed on the screen at the same time when the power is turned on again by the power switch or the remote controller of the main body. That is, similarly to the conventional image display device using a direct-view tube, an image is displayed at the time of turning on the power, so that a matrix-type image display device with greatly improved operability is realized.

[0035]

Since the image display device according to the present invention is configured as described above, the following effects can be obtained.

According to the invention described in claim 1 or 2,
In a matrix type image display device using a lamp as a light source, such as a DMD or a liquid crystal display device, during operation of the device,
If the user accidentally turns off the power by operating the power switch or remote control of the main unit, the screen display can be instantaneously restored by turning on the power again as long as a signal is input to the device. The operability of the device is greatly improved.

According to the third aspect of the present invention, in a matrix type image display device such as a DMD or a liquid crystal display device using a lamp as a light source, the user can operate the power switch or the remote control of the main body during operation of the device. When the power is turned off and a signal is input to the device, the device automatically starts up from standby mode, the lamp is turned on automatically, and then the power is turned on. Since the image is displayed, the operability of the device is greatly improved.

According to a fourth aspect of the present invention, in a matrix type image display device such as a DMD or a liquid crystal display device using a lamp as a light source, a user operates a power switch or a remote controller during operation of the device. When the power is turned off, the device turns off the screen display but shifts to the standby state with the lamp turned on. Is displayed. That is, similarly to the conventional image display device using a direct-view tube, an image is displayed at the time of turning on the power, so that a matrix-type image display device with greatly improved operability is realized.

[Brief description of the drawings]

FIG. 1 is a timing chart illustrating an operation of an image display device according to a first embodiment of the present invention when a signal is continuously input even after power is turned off.

FIG. 2 is a timing chart for explaining the operation of the image display device according to the first embodiment of the present invention when there is no signal input after the power is turned off.

FIG. 3 is a flowchart illustrating an operation of the image display device according to the first embodiment of the present invention.

FIG. 4 is a timing chart illustrating the operation of the image display device according to the second embodiment of the present invention.

FIG. 5 is a timing chart illustrating an operation of the image display device according to the third embodiment of the present invention.

FIG. 6 is a timing chart illustrating an operation of a conventional image display device.

[Explanation of symbols]

a power-off timing, b image display erasing timing, c light source lamp extinguishing timing, d image display device turning off timing, e image display device starting start timing, f power on timing, g light source lamp lighting H, the timing of restarting the image display, the timing at which the i signal input is lost, and the timing at which the j signal input is restarted.

Claims (4)

[Claims] 1. An image display device comprising: a power switch and a light source, wherein when the power switch is closed, an image corresponding to an input video signal is formed by the light source and displayed on a screen. First detecting means for detecting whether or not the light source is closed; second detecting means for detecting whether or not a video signal is input; and displaying the image on the screen and turning on the light source. And control means for controlling according to the detection results of the first and second detection means. In a state where an image is displayed on the screen, the first detection means determines that the power switch is opened. When detecting, the control means, when the second detection means detects that the video signal is continuously input,
The display of the screen is turned off while the light source is maintained in the lighting state, and the display of the screen is turned off and the light source is turned off when the second detection unit detects that a video signal is not input. Image display device. 2. When the first detection unit detects that the power switch has been closed after turning off the display of the screen while maintaining the light source in the lighting state, the control unit displays the screen display. The image display device according to claim 1, wherein the image display device is restarted. 3. An image display device comprising a power switch and a light source, wherein when the power switch is closed, an image corresponding to an input video signal is formed by the light source and displayed on a screen. First detecting means for detecting whether or not the light source is closed; second detecting means for detecting whether or not a video signal is input; and displaying the image on the screen and turning on the light source. Control means for controlling according to the detection results of the first and second detection means, wherein the control means resumes input of the video signal in a state where the power switch is open and the light source is off. When the second detecting means detects that the power switch has been turned on, the image display device is automatically activated and the light source is automatically turned on. Detection When stage is detected, the image display apparatus characterized by resuming the screen display. 4. An image display device comprising: a power switch and a light source, wherein when the power switch is closed, an image corresponding to an input video signal is formed by the light source and displayed on a screen. Detecting means for detecting whether or not is closed, and control means for controlling display of an image on the screen according to a detection result of the detecting means, wherein a state in which the image is displayed on the screen is provided. In the control means, when the detection means detects that the power switch has been opened, the control means turns off the display of the screen while maintaining the light source in a lighting state, and after turning off the display of the screen, the power switch An image display device for restarting the screen display when the detecting means detects that the image is closed.