Image Display Control Device Adaptive Luminance and Chroma Correction
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Solution Overview
Problem
Existing image display control devices face challenges in simultaneously reducing luminance to conserve power and correct image quality, especially in real-time applications like streaming images, as they often result in image deterioration and flicker due to inadequate consideration of chroma and high-speed processing requirements.
Innovation Solution
An image display control device that includes a statistical information acquisition section, a common calculator for real-time luminance and correction coefficient generation, a code storage section for operation procedures, and a decoder to manage code output, enabling adaptive luminance reduction and image correction while minimizing circuit size and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a look-up table (LUT) is used to simplify calculations for luminance reduction and image correction, then calculation complexity is reduced, but processing speed decreases due to memory access time
Solution Approach 1:
The patent pre-calculates and stores correction coefficients in a look-up table (LUT) during a setup phase, so that during real-time processing, only simple table lookups are needed instead of complex calculations. This preliminary preparation enables fast real-time processing by replacing computationally intensive operations with simple memory access.
Solution Approach 2:
The patent dynamically adjusts the balance between using pre-calculated LUT data and performing real-time calculations based on the specific processing requirements. For standard cases, it uses the LUT for speed, while for special cases requiring higher precision or adaptability, it performs additional calculations, thus optimizing the trade-off between speed and accuracy.
2Speed
If dedicated hardware is used to perform parallel calculations for high-speed processing, then processing speed increases, but circuit area and power consumption increase
Solution Approach 1:
The patent designs a multi-functional processing unit that can perform both LUT-based fast processing and full calculation operations using the same hardware resources. This universal processor eliminates the need for separate dedicated hardware circuits for different processing modes, thereby reducing overall circuit area and power consumption while maintaining high-speed capability when needed.
Solution Approach 2:
The patent changes the processing parameters dynamically by switching between different processing modes (LUT-based mode vs. full calculation mode) based on the application requirements. This allows the system to achieve high-speed processing when necessary while consuming minimal power during normal operation, effectively managing the speed-power trade-off.
3Use of energy by moving object
If lighting luminance is reduced adaptively to decrease power consumption, then power consumption decreases, but image quality deteriorates due to chroma impairment
Solution Approach 1:
The patent implements a feedback mechanism that continuously monitors image quality metrics (including chroma) and adjusts the luminance reduction level accordingly. When chroma deterioration is detected, the system reduces the luminance reduction amount or applies compensatory corrections, ensuring that power consumption is minimized while maintaining acceptable image quality.
Solution Approach 2:
The patent changes multiple parameters simultaneously, including luminance reduction level, correction coefficient strength, and processing intensity, to optimize the balance between power consumption and image quality. By adjusting these parameters dynamically based on content analysis, the system achieves energy efficiency without significant quality loss.
4Measurement precision
If lighting luminance changes quickly to follow luminance changes in the display image, then luminance tracking accuracy improves, but flicker occurs causing image quality deterioration
Solution Approach 1:
The patent applies temporal filtering that processes luminance changes at controlled intervals rather than instantaneously. By updating the luminance reduction level at optimized time intervals and using smoothing algorithms, the system tracks luminance changes accurately while avoiding rapid fluctuations that cause visible flicker, thus resolving the contradiction between tracking accuracy and flicker suppression.
Data Source
AI summary
An image display control device calculates a lighting luminance after reduction in luminance and an image correction coefficient by real-time calculations of a common calculator. The common calculator is controlled by microcodes stored in a code table. When correcting an image, chroma correction is enhanced to suppress a decrease in chroma due reduction in luminance, and a flicker is prevented by series infinite impulse response (IIR) filtering processes. When the image has a low average luminance but has a high chroma, a decrease in chroma is suppressed by limiting a reduction in lighting luminance.