Image Processing Device Saturation-Based Luminance Attenuation
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Solution Overview
Problem
Conventional display devices with OLED panels face challenges in reducing power consumption while maintaining image quality, as uniformly decreasing luminance can lead to image degradation and changes in viewer impression.
Innovation Solution
An image processing device that adjusts luminance based on the saturation of colors using a stored relationship between saturation and luminance attenuation ratio, allowing for selective reduction in luminance without degrading the image, and includes an additional color component with higher luminance and power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If luminance is uniformly decreased to reduce power consumption, then power consumption is reduced, but image quality degrades and viewer impression changes
Solution Approach 1:
The patent applies local quality by differentiating luminance attenuation based on color saturation levels. Instead of uniformly decreasing luminance across all pixels, the invention selectively attenuates luminance only for pixels with high saturation values (above a predetermined threshold), while maintaining original luminance for low saturation pixels. This localized approach reduces overall power consumption while preserving image quality in non-saturated regions.
Solution Approach 2:
The patent changes the luminance parameter dynamically based on saturation levels. By introducing a saturation-dependent luminance attenuation mechanism, the system adjusts luminance values conditionally: pixels with saturation above the threshold undergo luminance attenuation, while those below the threshold maintain their original luminance. This parameter change strategy enables power savings without uniform image degradation.
2Use of energy by moving object
If luminance is decreased to save power, then power consumption is reduced, but the display image degrades
Solution Approach 1:
The patent implements local quality by applying luminance attenuation selectively to specific pixel regions based on their saturation characteristics. Only pixels exceeding the saturation threshold undergo luminance reduction, while other pixels maintain their original display quality. This localized treatment preserves overall image quality while achieving power savings in specific high-saturation regions.
Solution Approach 2:
The patent modifies the luminance parameter conditionally based on saturation measurements. By establishing a threshold-based control mechanism, the system changes luminance values only when necessary (for high saturation pixels), thereby maintaining display image quality for the majority of pixels while reducing power consumption for specific regions.
3Use of energy by moving object
If saturation-based luminance attenuation is applied, then power consumption is reduced without degrading image, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-establishing a saturation threshold value before processing the image data. This predetermined threshold serves as a reference for subsequent pixel-by-pixel evaluation, enabling efficient decision-making about luminance attenuation without requiring complex real-time analysis. The preliminary setup simplifies the processing logic to a straightforward threshold comparison.
Solution Approach 2:
The patent utilizes parameter changes by transforming the luminance control approach from uniform to selective based on saturation values. The processing complexity is managed by implementing a simple threshold-based classification system that divides pixels into two groups (high saturation and low saturation), applying different luminance treatments to each group. This parameter-based classification avoids complex algorithms while achieving the desired power savings.
Data Source
AI summary
An image processing device comprising: a conversion unit to receive a first input signal including first color information, a first color being reproduced at pixels on the basis of the first color information, the first input signal including first color information obtained from an input image signal corresponding to a red component, a green component and a blue component, to specify saturation of the first color, and configured to obtain luminance attenuation ratio on the basis of a relationship previously stored between saturation and luminance attenuation ratio, and the saturation of the first color, and to output a second input signal including second color information whose luminance is decreased from the first color information on the basis of the luminance attenuation ratio corresponding to the first color information; and a signal processing unit configured to output an output signal for driving the pixels on the basis of the second input signal.