METHOD OF CONTROLLING LIQUID CRYSTAL DISPLAY DEVICE AND COMPUTER PROGRAM PRODUCT THEREFOR
First Claim
1. A method of controlling a liquid crystal display monitor (2) having a liquid crystal display panel (4) including a plurality of pixels, at least one data input device (30) for inputting image data to said liquid crystal display panel, and at least one illumination device (22) for illuminating said liquid crystal display panel, wherein at least one said illumination device has at least one respective first mode and at least one respective second mode, wherein the luminance of said illumination device is higher in the or each said second mode than in the or each said first mode, the method comprising:
- obtaining a plurality of first signals from respective sampled pixels, wherein said first signals represent luminance levels of respective sample pixels;
deriving at least one second signal from said first signals, wherein the or each said second signal represents an average brightness of said sampled pixels;
determining whether said average brightness is above a predetermined threshold value; and
setting at least one said illumination device to at least one first mode thereof in response to determination that said average brightness is above said threshold value.
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Abstract
A method of controlling a liquid crystal display monitor (2) is disclosed. The monitor has a liquid crystal display panel (4) having a plurality of pixels, a digital to analogue converter (30) for inputting image data to the display panel, and a backlight unit (20) having discharge lamps (22). A controller (26) determines whether an average brightness of an image is above a predetermined threshold value and sets the backlight unit (20) to a lower luminance setting in response to determination that said average brightness is above said threshold value to avoid discomfort to a user viewing the monitor.
7 Citations
13 Claims
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1. A method of controlling a liquid crystal display monitor (2) having a liquid crystal display panel (4) including a plurality of pixels, at least one data input device (30) for inputting image data to said liquid crystal display panel, and at least one illumination device (22) for illuminating said liquid crystal display panel, wherein at least one said illumination device has at least one respective first mode and at least one respective second mode, wherein the luminance of said illumination device is higher in the or each said second mode than in the or each said first mode, the method comprising:
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obtaining a plurality of first signals from respective sampled pixels, wherein said first signals represent luminance levels of respective sample pixels; deriving at least one second signal from said first signals, wherein the or each said second signal represents an average brightness of said sampled pixels; determining whether said average brightness is above a predetermined threshold value; and setting at least one said illumination device to at least one first mode thereof in response to determination that said average brightness is above said threshold value. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An illumination control data structure for use by a computer system for controlling a liquid crystal display monitor having a liquid crystal display panel including a plurality of pixels, at least one data input device for inputting image data to a plurality of said pixels, and at least one illumination device for illuminating the liquid crystal display panel and having at least one first mode and at least one second mode having higher luminance than the or each said first mode, the data structure including:
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first computer code executable to receive a plurality of first signals from respective sampled pixels representing respective luminance levels of said sampled pixels; second computer code executable to obtain from said first signals at least one second signal representing an average brightness of said sampled pixels; third computer code executable to determine whether said average brightness is above a predetermined threshold value; and fourth computer code executable to generate a control signal for use in setting at least one said illumination device to at least one first mode thereof in response to determination that said average brightness is above said threshold value. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification