METHOD OF DETERMINING LUMINANCE VALUES FOR A BACKLIGHT OF AN LCD PANEL DISPLAYING AN IMAGE
First Claim
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1. A method of controlling a backlight for a liquid crystal display (LCD) panel displaying a video image comprising a plurality of image frames, the controller having at least two methods for determining an illumination value for the backlight, wherein the method comprises selecting between the at least first and second methods based on properties of an image frame.
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Abstract
A controller for a backlight for a liquid crystal display (LCD) panel has at least two methods for determining illumination value for the backlight. The controller selects between the two methods based on properties of the image being displayed. The properties of the image include its color and its intensity.
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Citations
19 Claims
- 1. A method of controlling a backlight for a liquid crystal display (LCD) panel displaying a video image comprising a plurality of image frames, the controller having at least two methods for determining an illumination value for the backlight, wherein the method comprises selecting between the at least first and second methods based on properties of an image frame.
- 6. A method of determining illumination values for a backlight of a liquid crystal display (LCD) panel displaying an image, the backlight comprising a plurality of independently controllable illumination regions and the image being notionally divided into a plurality of image blocks, each image block corresponding to one of the backlight illumination regions, the image blocks comprising a plurality of image pixels having pixel color and brightness properties, the method comprising determining whether a number n of pixels in an image block meet a criterion, and, if n or more pixels meet the criterion using a first method to determine an illumination value for the backlight corresponding the image block, otherwise using a second method to determine the luminance value for the backlight corresponding to the image block.
Specification