Video Signal Processing Circuit Gradation Conversion
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Solution Overview
Problem
Existing video signal processing techniques, such as CABC, face challenges in reducing power consumption and maintaining image quality, particularly when dealing with mixed gradation regions, leading to gradation collapse and increased circuit complexity.
Innovation Solution
A video signal processing circuit that analyzes input signals to calculate a feature value, determines a threshold value, and performs gradation conversion using a linear function for regions above the threshold and a geometric series function for regions below, minimizing circuit scale and power consumption while maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If CABC control circuit increases luminance decrease amount and gradation conversion amount to reduce backlight power consumption, then power consumption is reduced, but gradation collapse occurs in high gradation regions causing image quality deterioration
Solution Approach 1:
The patent segments the video signal processing into multiple independent modules: feature value calculation unit, luminance decrease amount calculation unit, gradation conversion amount calculation unit, and correction value calculation unit. This segmentation allows each module to handle specific aspects of the processing independently, enabling precise control over gradation conversion to prevent collapse while maintaining power consumption benefits.
Solution Approach 2:
The patent dynamically changes processing parameters based on input video characteristics. The feature value calculation unit analyzes the input video signals to determine overall brightness characteristics, and based on this analysis, the system adjusts the luminance decrease amount and gradation conversion amount accordingly. This parameter adaptation allows the system to optimize power consumption while preventing gradation collapse in different video content scenarios.
2Illumination intensity
If gradation conversion is applied to compensate for luminance decrease, then visibility is maintained, but circuit complexity increases
Solution Approach 1:
The patent merges the luminance control function and gradation conversion function into a single integrated control circuit. The feature value calculation unit, luminance decrease amount calculation unit, and gradation conversion amount calculation unit work together as unified processing blocks, reducing the need for separate complex control mechanisms while maintaining both visibility and power consumption benefits.
Solution Approach 2:
The control circuit performs self-adjustment by automatically calculating the appropriate gradation conversion amount based on the luminance decrease amount and feature values. The system uses the correction value calculation unit to automatically determine the necessary compensation without requiring external intervention or complex external control mechanisms, thereby simplifying the overall circuit design.
3Manufacturing precision
If threshold value is set to divide gradation regions for conversion, then gradation collapse is suppressed, but processing complexity increases
Solution Approach 1:
The patent performs preliminary analysis of the input video signals through the feature value calculation unit before executing the actual luminance control and gradation conversion. This preliminary action includes determining the overall brightness characteristics and calculating appropriate threshold values in advance, which simplifies the subsequent processing by pre-defining the regions that require different conversion approaches.
Solution Approach 2:
The system implements feedback through the correction value calculation unit, which continuously monitors the effect of gradation conversion and adjusts the conversion amount accordingly. The feedback mechanism uses the calculated feature values and luminance decrease amounts to dynamically optimize the threshold-based region division, maintaining gradation accuracy while adapting to different video content without requiring manual intervention.
Data Source
AI summary
The video signal processing circuit which analyzes video signals inputted from outside, performs conversion processing for image quality adjustment on the video signals based on a result of analysis, transmits those towards a video display unit includes: a feature value/maximum value calculation module which calculates a feature value that is a numerical value showing a degree of brightness of the video signals; a gradation conversion threshold value calculation module which calculates a threshold value regarding conversion of the gradation based on a threshold value calculation expression that is formed based on the feature value and a conversion coefficient set in advance; and a gradation conversion module which performs gradation conversion based on a linear function that increases linearly by taking a region of the gradation equal to or higher than the threshold value among the video signals as a target.