Display Luminance Compensation via Segmented Gain Control
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Solution Overview
Problem
Existing display technologies face issues with luminance adjustments, leading to image distortions when ambient light changes, as direct backlight module adjustments alter RGB gain values, deviating from the desired γ=2.2 characteristic curve, resulting in unclear or overly exposed images.
Innovation Solution
A display system comprising an ambient sensor, scaler, and gain controller that generates an adjusted image signal by compensating for environmental luminance through a look-up table, allowing the backlight module and RGB gain values to be adjusted independently, maintaining the γ=2.2 characteristic curve and preventing image distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the luminance of the backlight module is directly adjusted to adapt to environmental luminance changes, then the display can compensate for environment luminance, but the RGB gain values change causing the characteristic curve to deviate from γ=2.2, resulting in image distortion
Solution Approach 1:
The patent divides the luminance adjustment process into two independent parts: backlight module luminance adjustment and RGB gain value adjustment. By segmenting these functions, the system can adjust the backlight to adapt to environmental luminance while separately maintaining the RGB gain values to preserve the γ=2.2 characteristic curve, thus avoiding image distortion.
Solution Approach 2:
The patent changes the adjustment parameters by introducing separate RGB gain value controls for each color channel (R, G, B). Instead of using a single luminance adjustment parameter that affects the entire display uniformly, the system independently adjusts the gain values of individual color channels to maintain the characteristic curve while adapting to environmental luminance changes.
2Illumination intensity
If the luminance of the backlight module is adjusted to be stronger or darker, then the display luminance changes to match environment, but the characteristic curve shifts from γ=2.2 to γ=1.2 or γ=3.2, resulting in unclear image details or improper exposure
Solution Approach 1:
The patent segments the luminance control into backlight intensity control and color channel gain control. This allows the backlight luminance to be adjusted independently to match environmental conditions while the RGB gain values are separately adjusted to maintain the γ=2.2 characteristic curve, preventing image quality degradation.
Solution Approach 2:
The patent applies different adjustment strategies to different parts of the display system: the backlight module is adjusted for overall luminance adaptation to environmental conditions, while each RGB color channel is locally adjusted with specific gain values to maintain the characteristic curve and ensure accurate color reproduction and image quality.
Data Source
AI summary
A display device capable of compensating for luminance of an environment is disclosed. The display device includes: a sensor, for sensing the luminance of the environment to generate a sensing signal corresponding to the luminance; a scaler, coupled to the sensor, for processing an original image signal according to the sensing signal to generate an adjusted image signal; and an image outputting device for outputting an image according to the adjusted image signal; wherein the scaler includes: an image signal adjuster for adjusting the original image signal to compensate for the luminance and generate a compensated image signal; and a gain controller coupled to the image signal adjuster for adjusting a gain setting and utilizing the adjusted gain setting to process the compensated image signal in order to generate the adjusted image signal.