Gamma Adjustment Circuit for PenTile Display Brightness and Resolution
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Solution Overview
Problem
Display devices employing the PenTile technique face challenges in maintaining image quality, particularly in low grayscale sections, due to resolution deterioration and gamma curve adjustments, which can lead to brightness inconsistencies and quality deterioration.
Innovation Solution
An image signal processing circuit that includes an input gamma adjuster for converting image signals using linear and non-linear gamma curves based on grayscale levels, and an output gamma adjuster utilizing lookup tables corresponding to inverse gamma curves, to generate data signals that improve brightness and reduce error rates in low grayscale sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the PenTile technique is employed to increase brightness by reducing the number of sub-pixels, then brightness is improved, but resolution deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting gamma characteristics of image signals based on grayscale sections. The input gamma adjuster modifies gamma values for different grayscale ranges (low, middle, high sections) to optimize both brightness and resolution perception, resolving the contradiction between PenTile brightness enhancement and resolution deterioration
2Illumination intensity
If gamma adjustment is applied to improve brightness in low grayscale sections, then brightness is improved, but brightness inconsistency occurs
Solution Approach 1:
The patent segments the gamma adjustment process into multiple independent stages: input gamma adjustment for different grayscale sections, image signal processing, and output gamma adjustment. Each stage handles specific grayscale ranges separately, allowing precise control over brightness in low grayscale sections while maintaining overall brightness consistency through coordinated processing
3Device complexity
If a single gamma curve is used for all grayscale sections, then processing is simplified, but image quality deteriorates in low grayscale sections
Solution Approach 1:
The patent divides the gamma curve into multiple segments corresponding to different grayscale sections (low, middle, high). The input gamma adjuster applies different gamma values to each section, and the output gamma adjuster uses separate lookup tables for each section. This segmentation enables optimized image quality in low grayscale sections while maintaining manageable processing complexity through structured multi-stage processing
Data Source
AI summary
A signal processing circuit includes an input gamma adjuster configured to adjust gamma characteristics of an image signal and to output a gamma adjustment image signal, an image signal processor configured to generate a scaling signal corresponding to image characteristics of the gamma adjustment image signal and to convert the gamma adjustment image signal into an intermediate data signal in response to the scaling signal, and an output gamma adjuster configured to convert the intermediate data signal into a data signal on a basis of a first lookup table corresponding to a first gamma curve, a second lookup table corresponding to a second gamma curve, and the scaling signal.