Backlight Control Excluding Text Areas for LCD Brightness Stability
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Solution Overview
Problem
Existing liquid crystal display (LCD) systems face high power consumption and brightness changes when displaying high-gradation text, such as subtitles, leading to deteriorated black visibility.
Innovation Solution
A display apparatus with a processor that identifies and excludes pixel information from text areas in an image to determine a current duty for the backlight unit, allowing for localized dimming and maintaining brightness and black visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If backlight dimming is applied based on pixel information of the entire image, then power consumption of the backlight unit is reduced, but brightness changes and black visibility deteriorate when high-gradation text is included
Solution Approach 1:
The image is divided into multiple regions, and text regions are identified and excluded from the pixel information used for backlight dimming calculation. This segmentation allows the system to calculate dimming levels based only on non-text areas, preventing brightness changes caused by high-gradation text while still achieving power consumption reduction through selective dimming of the backlight unit.
2Loss of energy
If local dimming is applied to reduce power consumption, then energy efficiency improves, but text visibility and image quality may be compromised
Solution Approach 1:
Text region information is extracted and excluded from the calculation of backlight dimming levels. By separating text regions from the overall image analysis, the system can apply dimming based on non-text areas only, ensuring that text visibility is maintained while still achieving energy efficiency improvements through localized backlight control.
Data Source
AI summary
A display device is disclosed. The display device comprises a display panel, a backlight unit, and a processor for driving the backlight unit so as to provide light to the display panel, wherein the processor is capable of acquiring a current duty for driving the backlight unit, on the basis of pixel information of an area excluding a text area in an input image, and driving the backlight unit on the basis of the acquired current duty.