JP2006285065A - Display device protection apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a means with which image sticking on a display device is prevented with respect to a broadcast program constituted of both a moving image part and a still image part on one screen and the moving image part is made to be viewed normally. <P>SOLUTION: A plane where a still image or an OSD is drawn is so configured that the plane has brightness prereduced and then can be combined with the moving image part, for example, with a certain time passed after drawing of a still image. Thus brightness of only the still image part can be reduced while always keeping normal brightness of the moving image part whose reduction of brightness is unnecessary, whereby image sticking on the display device can be prevented. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a burn-in protection means for a display device.

  In recent digital broadcasting, not only normal video (moving image) is displayed on a television receiver, but also a still image is broadcast, or an image obtained by mixing the television receiver OSD display and video is broadcast as an image. Various broadcasting forms have come to exist. On the other hand, in particular, new display devices (PDP, LCD, etc.) that change to CRT have the property that if the same still image is displayed for a long time, the display will burn, and a means to protect the display device is desired. Is done.

  Although there is a similar problem in the PC (personal computer) world, the screen culture (display) is relatively easy in the no operation state because the PC culture does not basically keep the user looking at the screen in the no operation state. It is customary to automatically run device protection applications. However, unlike this culture in the world of television receivers, the user (viewer) usually views the television receiver without any operation, so the timing and means for operating the screen saver function are the same as the PC. do not become.

  As measures to improve this, there are means to move the display position of the entire screen slightly at a specific timing, and means to reduce the brightness of the entire screen under certain specific conditions. It is impossible to suppress burn-in, and if the entire screen is reduced when the brightness is reduced, the brightness decreases to the moving image part. It will not be. Furthermore, depending on the ratio of the moving image portion and the still image portion mixed as the screen configuration of the television receiver, it is not easy to decide whether to prioritize device protection or prioritize user viewing.

The present invention provides means for allowing the luminance of only a still image portion to be always reduced under a specific condition without making such a difficult determination.
JP 2000-39867 A JP-A-8-63124

  The problem to be solved is that in a screen configuration in which a moving image and a still image are mixed, the burn-in of the display device cannot be prevented unless the luminance of the moving image portion is reduced.

  The most important feature of the present invention is that the luminance of the still image (OSD) plane is reduced first before the combination of the moving image plane and the still image (OSD) plane.

  By utilizing the fact that brightness can be controlled in units of planes, the present invention enables brightness control only for the still image portion, and the video portion can always be viewed at normal brightness even while device protection is implemented. There is an advantage that it becomes possible to provide.

  According to the first aspect of the present invention, the object of preventing burn-in of the display device can be realized without reducing the luminance of the moving image portion by adopting a configuration capable of reducing the luminance of only the still image portion. It is a device having an action.

  The invention according to claim 2 of the present invention is configured such that the luminance control can be applied only to the designated area in the plane including the moving picture plane, and depending on the scene, for example, the luminance is reduced also for a specific area in the moving picture portion. It is what you can do.

(Embodiment 1)
FIG. 1 is a block diagram of a first embodiment of the present invention.

  Reference numeral 101 denotes a memory area used to draw the OSD on the display device, reference numeral 102 denotes a memory area for drawing a still picture, and reference numeral 103 denotes a memory area for displaying a moving image. Reference numerals 104 and 105 denote brightness control apparatuses for controlling (reducing) the brightness of each plane, and reference numeral 108 denotes a control microcomputer for controlling the brightness control apparatus. Reference numeral 107 denotes a combining device that combines the planes, and the display device 108 displays the result.

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

  Normally, an image displayed on a digital television receiver is displayed on the display device 109 as data on memory represented by the OSD plane 101, the still image plane 102, and the moving image plane 103 as video information. At this time, display data existing on the OSD plane 101 and the still image plane 102 is displayed as a still image in most cases.

  For example, the control microcomputer 108 requests the brightness control devices 104 and 105 to perform a filter operation for lowering the brightness of the display data on the plane in a non-operation state for a certain period of time when a user operation is performed. As a result, when the display data on the plane with reduced brightness and the data of the moving picture plane with normal brightness are combined by the combining device 107, the display data becomes the display data with reduced brightness of only the still image portion. It will be projected on.

  The embodiment of FIGS. 3 and 4 is a screen display image diagram when the luminance of only the OSD area and the still image area is reduced. The control microcomputer 108 gives an instruction to reduce the brightness of the still image section triggered by the user's no-operation time, the elapsed time from the display, the brightness reduction request from the display device, or the user operation. As a typical example, it can be considered that the brightness of the OSD plane and the still image plane is always reduced when the user's no-operation time lasts for 5 minutes, and the original brightness is restored by detecting the user operation.

  In particular, in digital broadcasting, not only various screen configurations exist depending on the data broadcasting service, but the screen configuration is controlled by the broadcasting station. Therefore, on the television receiver side, it is necessary to have a simple mechanism that can cope with a screen configuration that may be updated every day, and a mechanism that simply reduces the brightness with such a simple algorithm will be very useful. .

  Although the method of reducing the luminance is described here as a means for protecting the display device, the display position is moved instead of the luminance control devices 104 and 105, the display content is changed to another one, and the display is changed. A method such as erasing is also possible.

(Embodiment 2)
FIG. 2 is a block diagram according to the second embodiment of the present invention, and is the same as FIG. 1 except for 204, 205, and 206. Reference numerals 204, 205, and 206 denote luminance control devices that can specify areas for the display data of the planes 201, 202, and 203, respectively.

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

  For example, when only still data is written in a specific area on the moving picture plane 203, the control microcomputer 208 determines that the area is also a still image portion, and the luminance is the same as that of the other OSD plane 201 and the still image plane 202. Reduction processing is performed. At this time, not only a luminance reduction request but also a reduction area is designated to the luminance control device 206.

  On the contrary, when the OSD plane or the still image plane is clearly displayed as a moving image, the control microcomputer can issue an instruction for luminance control except for the area portion.

  INDUSTRIAL APPLICABILITY The display device protection apparatus of the present invention has an effect that it is possible to always provide viewing at normal brightness with respect to a moving image portion even while performing device protection, and is useful as a field of electrical appliances with display devices. is there.

Overall configuration diagram of Embodiment 1 of the device of the present invention Overall configuration diagram of Embodiment 2 of the apparatus of the present invention Screen display image diagram of the device of the present invention (1) Screen display image of the device of the present invention (2)

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 OSD plane 102 Still picture plane 103 Moving picture plane 104 Brightness control apparatus 105 Brightness control apparatus 107 Composition apparatus 108 Control microcomputer 109 Display apparatus 201 OSD plane 202 Still picture plane 203 Moving picture plane 204 Brightness control apparatus (area specification is possible)
205 Brightness control device (Area can be specified)
206 Brightness control device (Area can be specified)
207 Synthesizer 208 Control microcomputer 209 Display device

Claims (2)

  An OSD plane indicating a memory area used for displaying an OSD on a screen of a display device, a still image plane indicating a memory area for displaying a still image on the screen, and a moving image on the screen A moving picture plane showing a memory area for combining, a combining device for combining the data of the three planes, a luminance control device capable of changing luminance information for the plane, and a control microcomputer capable of controlling the luminance control device; And a display device for displaying the combined display data, wherein only the luminance on the OSD plane and the still image plane can be reduced and displayed. The display device protection apparatus according to claim 1, wherein the luminance control can be applied only to a specified area in the plane for each plane including the moving image plane.

Images