JP2007286216A - Device and method for relaxing image persistence on display screen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device and method for relaxing image persistence of a display screen, capable of relaxing the image persistence while reducing degradation of image quality when viewing. <P>SOLUTION: The relaxation device is provided with a display position control means for moving a display position of an image in sub-pixel units of RGB forming a pixel in movement of an image performed for the purpose of relaxing image persistence of the screen. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a display screen burn-in mitigation device and a method thereof in a display device such as a plasma display.

  Various methods and display methods have been proposed for reducing the image burn-in of a display device such as a plasma display.

  For example, a display device has been proposed that has a function of moving the display position of an image vertically and horizontally in units of pixels (dots) in order to reduce burn-in of the display (see, for example, Patent Document 1). This is to reduce the image sticking by moving the display position in units of pixels in the vertical and horizontal directions every predetermined time and changing the luminance of the same position on the screen.

FIG. 1 is a schematic diagram for explaining the principle of a conventional display method for reducing burn-in. As is well known, each pixel (unit pixel) constituting the display screen is formed of phosphor cells of three primary colors of red (R), green (G), and blue (B) which are the minimum units. As shown in FIG. 1, conventionally, the position of the display image has been moved in units of one pixel.
JP 2000-227775 A (page 2 to page 4, FIG. 1)

  However, the conventional display method for mitigating burn-in is compared with a case where this burn-in mitigation method is not used because the image moves during viewing even if it is in units of one pixel, and the video flickers during viewing. There was a problem that the image quality was not preferable. In particular, in a large screen display, the size of one pixel is larger than that in a small screen display, so even if the movement is performed in units of one pixel, the video quality is greatly deteriorated due to flickering of the video due to this movement. It becomes.

  That is, as an example of the problem to be solved by the present invention, to provide a burn-in mitigation device and a burn-in mitigation display method capable of mitigating burn-in while suppressing deterioration in video quality during viewing is taken as an example. Can be mentioned.

  The display screen burn-in mitigation device according to claim 1 includes display position control means for moving an image display position in units of RGB sub-pixels constituting a pixel when moving an image for the purpose of mitigating screen burn-in. It is characterized by that.

  The display screen burn-in mitigating method according to claim 4 is a display position control step of moving an image display position in units of RGB sub-pixels constituting a pixel in moving an image for the purpose of mitigating screen burn-in. It is characterized by including.

Embodiments according to the present invention will be described below.
An image sticking mitigation apparatus according to an embodiment of the present invention includes a display position control unit that moves an image display position in units of RGB sub-pixels constituting a pixel when moving an image for the purpose of mitigating screen burn-in. This is the best embodiment.
The display screen burn-in mitigation method according to the embodiment of the present invention is a display that moves an image display position in units of RGB sub-pixels constituting a pixel in moving an image for the purpose of mitigating screen burn-in. The best mode is to include the position control step.
The display screen burn-in mitigation device and method according to the embodiment of the present invention having the above-described configuration have an effect of reducing burn-in while reducing deterioration in image quality during viewing. It is useful in a display device having

  Hereinafter, specific examples of a burn-in mitigation device and a burn-in mitigation method according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 2 is a diagram showing a circuit configuration of a television receiver to which the display screen burn-in mitigation device according to the embodiment of the present invention is applied. As an example, a television receiver having a matrix display with a 1920 × 1080 pixel configuration will be described.

  The television receiver 100 mainly includes a digital tuner 10, a video signal processing unit 20, a RED position control unit 30, a GREEN position control unit 31, a BLUE position control unit 32, a display position control unit 40, a timer 50, a CPU 60, and panel control. Unit 70, plasma display 80, and the like.

  The digital tuner 10 sends the generated digital color difference video signal to the video signal processing unit 20. The video signal processing unit 20 performs various types of signal processing (for example, progressive conversion of an interlace signal) on the video signal to improve the image quality. Also, the color space of the video signal is converted to RGB, and enlargement / reduction processing is performed to the number of pixels of the display device 1920 × 1080. The RED signal is sent to the RED position control unit 30, and the GREEN signal is sent to the GREEN position control unit 31. The BLUE signal is sent to the BLUE position control unit 32, and the H / V signal is sent to the display position control unit 40. The CLK signal is sent to all of the RED position control unit 30, the GREEN position control unit 31, the BLUE position control unit 32, and the display position control unit 40.

  Further, the display position control unit 40 transmits the horizontal display position control signal (RH_POSI) of the RED signal to the RED position control unit 30, the horizontal display position control signal (GH_POSI) of the GREEN signal to the GREEN position control unit 31, and the BLUE signal. The horizontal display position control signal (BH_POSI) is output to the BLUE position control unit 32, and the common vertical display position control signal of the RED / GREEN / BLUE signal is output to the RED position control unit 30, the GREEN position control unit 31, and the BLUE position control unit 32. .

  On the other hand, the timer 50 controls the timing for moving the screen display position under the control of the CPU 60. Specifically, a timing signal is sent to the display position control unit 40 at an arbitrary timing.

  The display position control unit 40 is a display position control signal for RED, GREEN, and BLUE signals based on H (horizontal synchronization signal), V (vertical synchronization signal), and DE (data enable signal) output from the video signal processing unit 20. Generate (RH_POSI / GH_POSI / BH_POSI / V_POSI) signal. The display position control unit 40 switches the generation of the display position control signal using the timing signal of the timer 50 as a trigger according to the display position control information from the CPU 60.

  The display position control signal includes information regarding the moving direction of the screen and the moving order of the RED, GREEN, and BLUE signals. FIG. 3 is a diagram for explaining a situation in which the display position control signal is changed by inputting a timing signal. As shown in the figure, the display position is controlled in the order of the RED signal ((2) in FIG. 3), the GREEN signal ((3) in FIG. 3), and the BLUE signal ((4) in FIG. 3). The signal (RH_POSI / GH_POSI / BH_POSI / V_POSI) changes, and the image moves to the left side toward the screen in subpixel units. Note that the sequence for changing the control signal as described above is realized by the CPU 60 executing a preset program.

  FIG. 4 is a schematic diagram (when the pixel configuration is a stripe arrangement) for explaining the principle of the display screen burn-in mitigation display method according to the embodiment of the present invention. In the plasma display 80, based on the display position control signal, an image moves in units of subpixels as shown in the figure. That is, the amount of movement at one time is 1/3 compared to the conventional movement in pixel units.

  As described above, according to the television receiver to which the display screen burn-in mitigation device according to the embodiment of the present invention is applied, as the display position control means, the CPU 60, the timer 50, the display coordinate control unit 40, and the RED position control unit. 30, the green position control unit 31 and the blue position control unit 32 cooperate to move the display position of the image in units of sub-pixels, so that the red, green, and blue sub-pixels move individually with a time shift. Therefore, the amount of image movement at one time is small, and image sticking can be alleviated while reducing deterioration in image quality during viewing due to image movement.

  In the above embodiment, since a stripe arrangement display is used, the vertical row on the screen moves when moving the sub-pixels of any color, but this is not a limitation. For example, it goes without saying that the present invention is applicable to a display having a pixel configuration other than the stripe arrangement, such as the pixel arrangement shown in FIG.

It is a schematic diagram for demonstrating the principle of the conventional image sticking mitigation display method. It is a figure which shows the circuit structure of the television receiver to which the burn-in reduction apparatus of the display screen in the Example of this invention is applied. In the circuit of FIG. 2, it is a figure for demonstrating the condition where a display position control signal is changed by the input of a timing signal. It is a schematic diagram for demonstrating the principle of the burn-in display reduction method of the display screen in the Example of this invention (a pixel structure is a stripe arrangement | sequence). It is a schematic diagram which shows an example of arrangement | sequences other than a stripe arrangement | sequence by pixel structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Digital tuner 20 Video signal processing part 30 RED position control part 31 GREEN position control part 32 BLUE position control part 40 Display position control part 50 Timer 60 CPU
70 Panel control unit 80 Plasma display

Claims (5)

  A display screen burn-in mitigation device comprising display position control means for moving an image display position in units of RGB sub-pixels constituting a pixel in moving an image for the purpose of mitigating screen burn-in.   The pixel configuration of the pixels is a stripe arrangement, and by moving a display position of the image in units of sub-pixels, vertical columns on the screen are sequentially moved and the image is moved in the horizontal direction. The display screen burn-in mitigation device according to 1.   2. The display screen according to claim 1, wherein a pixel configuration of the pixels is an array other than a stripe array, and the image moves in a predetermined direction by moving a display position of the image in units of the sub-pixels. Seizure mitigation device.   A display screen burn-in mitigation method comprising a display position control step of moving an image display position in units of RGB sub-pixels constituting a pixel in moving an image for the purpose of mitigating screen burn-in.   5. The pixel configuration according to claim 4, wherein the pixel configuration is a stripe arrangement, and by moving the display position of the image in units of sub-pixels, the vertical row on the screen is sequentially moved and the image is moved in the horizontal direction. The display screen burn-in mitigation method described in 1.

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