Timing Controller Dynamic White Luminance Adjustment
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Solution Overview
Problem
Liquid crystal display (LCD) devices maintain constant white luminance, leading to increased power consumption and potential eye strain due to bright images, while existing techniques like average picture level (APL) degrade picture quality by lowering backlight luminance, especially in images with high white components.
Innovation Solution
A timing controller with a gamma adjusting unit that analyzes image data to adjust luminance based on the amount of white, using a pixel analyzing unit, backlight gain setting unit, and gamma curve adjusting unit to generate a gamma control signal, thereby optimizing luminance and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the LCD device maintains constant white luminance regardless of the amount of white in image data, then the picture quality remains sharp and bright, but power consumption increases unnecessarily
Solution Approach 1:
The patent applies dynamics by making the white luminance dynamic rather than static. The timing controller dynamically adjusts the white luminance level based on the detected amount of white in the image data, allowing the display to adapt its luminance characteristics to match the content being displayed, thereby reducing power consumption when white content is prevalent while maintaining picture quality when needed
Solution Approach 2:
The patent changes the luminance parameter based on the amount of white in image data. By detecting the white content ratio and adjusting the white luminance output accordingly, the system modifies a key display parameter (luminance) to optimize both power consumption and picture quality based on actual content requirements
2Use of energy by moving object
If the APL technique lowers backlight luminance to reduce power consumption, then power consumption decreases, but picture quality degrades due to reduced maximum output
Solution Approach 1:
The patent applies local quality by selectively adjusting only the white luminance level rather than uniformly lowering all backlight luminance. The timing controller specifically targets and reduces white content luminance while preserving the maximum output capability for non-white content, thereby maintaining picture quality in critical regions while reducing power consumption overall
Solution Approach 2:
The patent changes the white luminance parameter selectively based on image content analysis. Instead of uniformly reducing backlight luminance as in APL technique, the system modifies only the white level parameter while maintaining other luminance characteristics, thus preserving picture quality while achieving power consumption reduction
3Reliability
If the LCD device maintains high white luminance to provide bright and sharp picture quality, then picture quality is enhanced, but eye strain increases due to excessive brightness
Solution Approach 1:
The patent makes the white luminance dynamic by continuously monitoring the amount of white in image data and adjusting the output accordingly. When images contain significant white content, the system automatically reduces white luminance to appropriate levels, preventing excessive brightness and eye strain while maintaining bright and sharp picture quality for images with less white content
Data Source
AI summary
A timing controller capable of adjusting luminance of a maximum gradation according to an amount of white of image data to thus enhance picture quality and reduce power consumption of a liquid crystal display device, a liquid crystal display device having the same, and a driving method thereof are provided. The timing controller includes: a gamma adjusting unit for receiving image data and a plurality of driving signals input from the outside, generating a gate control signal and a data control signal according to the plurality of driving signals, adjusting luminance according to an amount of white in the image data, and generating a corresponding gamma control signal.