Displaying images on local-dimming displays
AssigneeDolby Laboratories Licensing Corporation
InventorsAjit Ninan, Wenhui Jia
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Abstract
Displays, display components, image and video processing apparatus and related methods are described. A method for driving local-dimming displays comprises generating control values for driving pixels of a spatial light modulator from one image data component and generating control values for driving backlight elements from a second image data component. The first and second image data components may respectively comprise a tone map and a ratio image. Control values for the spatial light modulator and/or backlight may be obtained using cost effective hardware.
Claims17
Apparatus for driving a local-dimming display comprising a backlight and a spatial light modulator, the backlight comprising a plurality of individually-controllable elements, the apparatus comprising:
- a decoder configured to:
- receive, from an encoder, image data comprising (i) a first image data component comprising a low-dynamic range version of an image;
- and (ii) a second image data component comprising values that can be used to modify the low-dynamic range version of the image to recover a high-dynamic range version of the image, wherein the low-dynamic range version of the image is a tone-mapped image of the high-dynamic range version of the image, and
- extract, from the image data, the first image data component and the second image data component;
- a first system configured to generate, using the first image data component and without using the high-dynamic range version of the image, first driving signals for the spatial light modulator;
- and
- a second system configured to:
- combine the tone-mapped image and the values from the second image data component to generate the high-dynamic range image,
- extract luminance values of the high-dynamic range image,
- down-sample the luminance values of the high-dynamic range image to generate down-sampled data, and
- generate, using the second image data component and without using the high-dynamic range version of the image, second driving signals for controlling the individually controllable elements of the backlight by generating the second driving signals based on the down-sampled data.
A method for driving a local-dimming display comprising a backlight and a spatial light modulator, the backlight comprising a plurality of individually-controllable elements, the method comprising:
- obtaining, from an encoder, image data comprising (i) a first image data component comprising a low-dynamic range version of an image;
- and (ii) a second image data component comprising values that can be used to modify the low-dynamic range version of the image to recover a high-dynamic range version of the image, wherein the low-dynamic range version of the image is a tone-mapped image of the high-dynamic range version of the image;
- extracting, from the image data, the first image data component and the second image data component;
- generating, using the first image data component and without using the high-dynamic range version of the image, first driving signals for the spatial light modulator;
- combining the tone-mapped image and the values from the second image data component to generate the high-dynamic range image;
- extracting luminance values of the high-dynamic range image;
- down-sample the luminance values of the high-dynamic range image to generate down-sampled data;
- and
- generating, using the second image data component and without using the high-dynamic range version of the image, second driving signals for controlling the individually controllable elements of the backlight by generating the second driving signals based on the down-sampled data.
A display apparatus comprising:
- a backlight comprising a plurality of individually controllable elements;
- a spatial light modulator configured to receive light from the plurality of individually controllable elements of the backlight;
- a decoder configured to:
- receive, from an encoder, image data comprising (i) a first image data component comprising a low-dynamic range version of an image;
- and (ii) a second image data component comprising values that can be used to modify the low-dynamic range version of the image to recover a high-dynamic range version of the image, wherein the low-dynamic range version of the image is a tone-mapped image of the high-dynamic range version of the image;
- and
- extract, from the image data, first image data component and the second image data component;
- a first system configured to generate, using the first image data component and without using the high-dynamic range version of the image, first driving signals for the spatial light modulator;
- and
- a second system configured to:
- combine the tone-mapped image and the values from the second image data component to generate the high-dynamic range image,
- extract luminance values of the high-dynamic range image,
- down-sample the luminance values of the high-dynamic range image to generate down-sampled data, and
- generate, using the second image data component and without using the high-dynamic range version of the image, second driving signals for controlling the individually controllable elements of the backlight.
Dependencies are inferred from the claim text.