CONTROL DEVICE FOR LIQUID CRYSTAL DISPLAY DEVICE, LIQUID CRYSTAL DISPLAY DEVICE, METHOD FOR CONTROLLING LIQUID CRYSTAL DISPLAY DEVICDE, PROGRAM, AND STORAGE MEDIUM
First Claim
1. A control device for controlling operations of a liquid crystal display device which includes a liquid crystal display panel and a backlight unit having a plurality of light sources arranged in a matrix manner in a backside of the liquid crystal display panel,said control device comprising:
- a liquid crystal control section which controls pixels of the liquid crystal display panel in accordance with inputted image data;
a backlight control section which controls light-emitting states of respective ones of the plurality of light sources in accordance with the inputted image data; and
an image size adjusting section which generates size-adjusted image data in a case where an aspect ratio of the inputted image data is different from an aspect ratio of the liquid crystal display panel, the image size adjusting section adding dummy image data to a periphery of (i) image data which is obtained by subjecting the inputted image data to a predetermined process or (ii) the inputted image data so as to generate the size-adjusted image data, so that an aspect ratio of the size-adjusted image data corresponds to the aspect ratio of the liquid crystal display panel,the backlight control sectiondividing the size-adjusted image data into a plurality of blocks which correspond to respective positions in which the plurality of light sources are provided,determining a light-emitting luminance of each light source in an image display area among the plurality of light sources in accordance with a maximum value among gradation values of pixels included in that one of the plurality of blocks corresponding to the light source, the image display area being an area for displaying an image corresponding to the inputted image data, anddetermining a light-emitting luminance of each light source in an image non-display area among the plurality of light sources in accordance with (i) an average luminance level of pixels included in a block of an image display area adjacent to a block corresponding to the light source, the image non-display area being an area in which an image corresponding to the dummy image data is displayed, or (ii) an average luminance level of some of a plurality of small blocks which are adjacent to the block corresponding to the light source in the image non-display area, the plurality of small blocks being obtained by further dividing the block of the image display area adjacent to the block corresponding to the light source.
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Abstract
At least one embodiment of the present invention relates to a liquid crystal display device including a liquid crystal display panel and a backlight unit having light sources arranged in back of the liquid crystal display panel. Image data obtained by adding a dummy image to a periphery of inputted image data is divided into blocks which correspond to positions of LEDs. A light-emitting luminance of an LED in an image display area, in which an image corresponding to the inputted image data is displayed, is determined in accordance with a maximum value among gradation values of pixels included in a block corresponding to the LED. A light-emitting luminance of an LED in an image non-display area, in which an image corresponding to the dummy image data is displayed, is determined in accordance with an average luminance level of some of small blocks which are adjacent to the block corresponding to the LED in the image non-display area, the small blocks being obtained by further dividing a block of the image display area adjacent to the block corresponding to the LED. According to the present invention, in a case where an aspect ratio of the inputted image data is different from that of the liquid crystal display panel, display quality in a border area of the image display area and the image non-display area can be improved.
77 Citations
9 Claims
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1. A control device for controlling operations of a liquid crystal display device which includes a liquid crystal display panel and a backlight unit having a plurality of light sources arranged in a matrix manner in a backside of the liquid crystal display panel,
said control device comprising: -
a liquid crystal control section which controls pixels of the liquid crystal display panel in accordance with inputted image data; a backlight control section which controls light-emitting states of respective ones of the plurality of light sources in accordance with the inputted image data; and an image size adjusting section which generates size-adjusted image data in a case where an aspect ratio of the inputted image data is different from an aspect ratio of the liquid crystal display panel, the image size adjusting section adding dummy image data to a periphery of (i) image data which is obtained by subjecting the inputted image data to a predetermined process or (ii) the inputted image data so as to generate the size-adjusted image data, so that an aspect ratio of the size-adjusted image data corresponds to the aspect ratio of the liquid crystal display panel, the backlight control section dividing the size-adjusted image data into a plurality of blocks which correspond to respective positions in which the plurality of light sources are provided, determining a light-emitting luminance of each light source in an image display area among the plurality of light sources in accordance with a maximum value among gradation values of pixels included in that one of the plurality of blocks corresponding to the light source, the image display area being an area for displaying an image corresponding to the inputted image data, and determining a light-emitting luminance of each light source in an image non-display area among the plurality of light sources in accordance with (i) an average luminance level of pixels included in a block of an image display area adjacent to a block corresponding to the light source, the image non-display area being an area in which an image corresponding to the dummy image data is displayed, or (ii) an average luminance level of some of a plurality of small blocks which are adjacent to the block corresponding to the light source in the image non-display area, the plurality of small blocks being obtained by further dividing the block of the image display area adjacent to the block corresponding to the light source. - View Dependent Claims (2, 3, 4, 5, 6, 8, 9)
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7. A method for controlling operations of a liquid crystal display device which includes a liquid crystal display panel and a backlight unit having a plurality of light sources arranged in a matrix manner in a backside of the liquid crystal display panel,
said method comprising the steps of: -
(a) controlling pixels of the liquid crystal display panel in accordance with inputted image data; (b) controlling light-emitting states of respective ones of the plurality of light sources in accordance with the inputted image data; and (c) generating size-adjusted image data in a case where an aspect ratio of the inputted image data is different from an aspect ratio of the liquid crystal display panel, the size-adjusted image data being generated by adding dummy image data to a periphery of (i) image data which is obtained by subjecting the inputted image data to a predetermined process or (ii) the inputted image data so that the size-adjusted image data has an aspect ratio which corresponds to the aspect ratio of the liquid crystal display panel, the step (b) including; (d) dividing the size-adjusted image data into a plurality of blocks which correspond to respective positions in which the plurality of light sources are provided; (e) determining a light-emitting luminance of each light source in an image display area among the plurality of light sources in accordance with a maximum value among gradation values of pixels included in that one of the plurality of blocks corresponding to the light source, the image display area being an area for displaying an image corresponding to the inputted image data; and (f) determining a light-emitting luminance of each light source in an image non-display area among the plurality of light sources in accordance with (i) an average luminance level of pixels included in a block of an image display area adjacent to a block corresponding to the light source, the image non-display area being an area in which an image corresponding to the dummy image data is displayed, or (ii) an average luminance level of some of a plurality of small blocks which are adjacent to the block corresponding to the light source in the image non-display area, the plurality of small blocks being obtained by further dividing the block of the image display area adjacent to the block corresponding to the light source.
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Specification