JPH0981075A - Video display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a burn by changing over the screen of a plasma display panel(PDP) to a fully white screen when there are no persons and to stop the light emission of the PDP in case there are no persons even after the elimination of the burn. SOLUTION: The video signal 1 for an information screen is inputted via a switch 3 to a panel driving section 4 even when the person is detected in a person detecting section 6. Required signal processing is executed in the section, by which the PDP is driven and display is made on the screen. The driving time of the device is measured and integrated by a timer 7 and the data is inputted via a control section 10 to a discriminating section 9 and is compared with the data read out of a memory section 8. The switch 3 is changed over to a white signal source 2 side and the fully white screen is displayed on the PDP unless the person is detected in the person detecting section when the required time is attained. The display time of the fully white screen is integrated by a timer. The device is changed over to a screen saver operation, such as the stop of the light emission of the PDP by the panel driving section unless the person is detected when the integrated time attains the required time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device using a plasma display panel (PDP), which displays an all-white screen when a person is absent to make the image sticking of the PDP inconspicuous.

[0002]

2. Description of the Related Art When a display device for an information screen is provided at a reception desk in an office and is used for guiding a visitor,
By using a PDP for the display, it has the advantage that the device can be made thin and can be installed even in a narrow space. However, when the same image is displayed on the screen for a long time, the PDP has a bright image. Changes in the emission characteristics of the phosphor in the area where is displayed, there is a difference in brightness between cells that have emitted light for a long time and cells that did not emit light, and the displayed image is uneven, so-called burn-in occurs. There is a problem. This image sticking is particularly noticeable when the same still image is displayed for a long time like an information screen. As a method of eliminating this burn-in, for example, by displaying an all-white screen on a PDP, a cell that did not emit light is caused to emit light, and the emission characteristics of the phosphor of this cell are changed to the phosphor of the cell that emitted light for a long time. There is a method of making the unevenness of light emission close to that of No. 1 to make the unevenness of the screen inconspicuous, but it is troublesome because an operation of displaying an all-white screen must be performed when the device is not used.

[0003]

SUMMARY OF THE INVENTION In view of the above, the present invention has a person detecting section in the apparatus, and when a person is not detected, the screen is switched to an all-white image for a required time to eliminate screen burn-in. Further, when the absence of a person exceeds the required time, the screen saver operation is switched to, the panel light emission is stopped, and the burning of the PDP is eliminated and power saving is performed.

[0004]

In order to solve the above-mentioned problems, the present invention is provided in a video display device for displaying on the basis of a video signal, and a person detecting section for detecting a person in the vicinity of the front surface of the device, and an all white screen. A white signal source for outputting the video signal, a switch for switching between the video signal and the signal from the white signal source, and a control section for controlling the person detecting section and the switch. The person non-detection by the person detecting section And a video signal display device in which an all white screen is displayed on the display by switching the switch to the white signal source side by the signal.

[0005]

With the above construction, in the image display apparatus according to the present invention, when a person is detected by the person detecting section, the apparatus is powered on and an information screen is displayed on the display section constituted by PDP or the like. To do. In response to the start of this operation, a timer is started and the operating time is measured and integrated.
When the operation time reaches the required time and no person is detected, the switch is switched to the white signal source side, the all white screen is displayed, and the burn-in is eliminated. At this time, the display accumulated time on the information screen is cleared, and the display time of the all white screen is newly started to be accumulated. Then, when the set time is reached, if no person is detected, the device is switched to the screen saver operation, the operation is shifted to the power saving operation, the light emission of the PDP is stopped, and the standby state is set.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a video display apparatus according to the present invention. FIG. 1 is a block diagram of a main part of an embodiment of a video display device according to the present invention. In the figure, 1 is a video signal for displaying an information screen, 2 is a white signal source for displaying an all white screen. A switch 3 switches between the video signal 1 and the signal from the white signal source 2. A panel drive unit 4 drives the PDP 5 based on a signal input through the switch 3.
Reference numeral 6 denotes a person detection unit, which is composed of, for example, a pyroelectric infrared sensor or the like, and detects a person by heat rays. Reference numeral 7 is a timer, which counts and integrates the operating time of the device. A storage unit 8 stores a reference value of the integrated time of the information screen display and the integrated time of the all white screen display. Reference numeral 9 is a discriminator, which is a timer 7.
Is compared with the reference integration time read from the storage unit 8 to make a determination. A control unit 10 controls each unit of the device.

Next, the operation of the image display device according to the present invention will be described with reference to the flow chart shown in FIG. Person detection unit 6
Is provided in the vicinity of the front surface of the device and always operates with a power supply different from the power supply of the device, and detects a person while the power of the device is off. When a person is detected by the person detecting unit 6 (step 1: Yes, hereinafter abbreviated as ST1) and the apparatus is not operating at this time (ST2: No), the apparatus is switched to the operating state (ST3). At this time, the switch 3 is switched to the side of the video signal 1, and the video signal 1 is input to the panel drive unit 4 via the switch 3 to perform the necessary signal processing for displaying on the PDP 5 and input to the PDP 5. Display the screen. Then, the control unit 10 activates the timer 7 to count and integrate the operation time (ST4). The data of the integrated time from the timer 7 is input to the determination unit 9 via the control unit 10 and compared with the data read from the storage unit 8 via the control unit 10 to determine that the required set time has been reached ( ST5: Ye
s) and if the person detection unit 6 does not detect a person (ST
6: No), the integration of the timer 7 is cleared by the control unit 10 based on the signal from the determination unit 9, and at the same time, the switch 3 is switched to the white signal source 2 side and the all white screen is displayed on the PDP 5 (ST7). . As a result, in the PDP 5, a cell that did not emit light on the information screen emits light, and the emission characteristic of the phosphor of this cell approaches the characteristic of the cell that has been emitting light for a long time, and the screen unevenness decreases and becomes inconspicuous.

At the same time as switching to the all-white screen display, the control unit 10
Then, the timer 7 is started, and the display time of the all white screen is integrated (ST8). The accumulated time data from the timer 7 is input to the determination unit 9 via the control unit 10 and compared with the set time of the all-white screen display read from the storage unit 8 via the control unit 10.
No person is detected by the person detection unit 6 while the all white screen is displayed (ST
9: No) When the required set time is reached (ST10: Yes),
The control unit 10 clears the accumulated time of the timer 7, outputs a signal from the control unit 10 to the panel drive unit 4, stops the light emission of the PDP 5, and switches to the screen saver operation (ST
11) Enter the standby state (return to ST1). If a person is detected when the accumulated time on the information screen reaches the required time (ST6: Yes), the operation continues until no person is detected. If it is detected (ST9: Yes), the screen is immediately switched to the information screen display. In this case, the integration time of the all-white screen display is not cleared, and the integration is continued at the next all-white screen display.

[0009]

As described above, according to the image display device of the present invention, when there is no person in front of the information screen when the display of the information screen reaches the required time, the screen is displayed in all white. Switching to eliminate the burning of the PDP, and when the all-white screen display reaches the required time, the PDP
Since the light emission of PDP is stopped and the screen saver operation is switched to, the burn-in of the PDP is eliminated without inconvenience to the user, and after the burn-in is eliminated, the light emission is stopped to extend the life, and It has an excellent function of saving electricity.

[Brief description of drawings]

FIG. 1 is a main block diagram of an embodiment of a video display device according to the present invention.

FIG. 2 is a flow chart for explaining the operation of the image display device according to the present invention.

[Explanation of symbols]

 1 Video signal 2 White signal source 3 Switch 4 Panel drive unit 5 PDP 6 Human detection unit 7 Timer 8 Storage unit 9 Discrimination unit 10 Control unit

Claims (6)

[Claims] 1. A human detection unit provided in a video display device for displaying based on a video signal, for detecting a person in the vicinity of the front of the device, a white signal source for outputting an all-white video signal, the video signal and A switch for switching the signal from the white signal source, and a control section for controlling the person detecting section and the switch, and the switch is switched to the white signal source side by the person non-detection signal from the person detecting section. An image display device that displays an all-white screen. 2. The white signal source comprises all bits of red, green and blue set to a maximum level.
The image display device according to the above. 3. A timer is provided to integrate the operating time of the device, and when the required integration time is reached and no person is detected by the human detection unit, the switch is switched to the white signal source side, and the integration time is simultaneously established. Claim 1 which resets
Alternatively, the video display device according to claim 2. 4. A screen saver drive unit for driving a display device with required limited functions is provided, and the display time of an all-white screen is integrated by the timer, and the required integration time is reached.
4. The image display apparatus according to claim 3, wherein when the person detection section does not detect a person, the screen saver drive section switches the apparatus to a screen saver operation and resets the integrated time at the same time. 5. The image display according to claim 4, wherein the screen saver operation time is counted by the timer, and when the required time is reached, and the person detecting section does not detect a person, the power of the apparatus is turned off. apparatus. 6. The person detecting section is operated by another power source so as to operate even when the power of the apparatus is turned off, and when a person is detected while the power is off, the apparatus is turned on and the switch is turned on. The video display device according to claim 1, claim 2, claim 3, claim 4, or claim 5, wherein the video signal is switched to the video signal side and displayed based on the video signal.