Display Panel Degradation Evaluation Using Mutual Information

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Solution Overview

Problem

Current methods for evaluating the degradation of display panels, such as mura, are primarily qualitative and lack a quantitative assessment, making it difficult to accurately compensate for degradation using compensation technologies.

Innovation Solution

An apparatus and method that analyze the correlation between a reference frame and an evaluation frame using histogram distribution vectors, mutual information, and cognitive characteristics to generate a quantitative evaluation value for degradation, which is then used to compensate for display data degradation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If visual evaluation method is used to assess degradation, then the evaluation process is simple, but the measurement precision is insufficient

Engineering Contradiction:

Improveevaluation process complexityVSAvoiddegradation assessment precision

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent replaces the mechanical/visual evaluation system with an information-theoretic measurement system. Specifically, it uses mutual information calculation between histogram distribution vectors of reference and evaluation frames to objectively quantify degradation, substituting human visual assessment with mathematical computation that provides precise numerical measurements of degradation levels.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent transforms the degradation assessment from a qualitative visual parameter to a quantitative information-theoretic parameter. By calculating mutual information and incorporating cognitive characteristics weights, it converts subjective visual evaluation into objective numerical parameters that precisely measure degradation states.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If compensation technology is applied to reduce degradation, then the image quality is improved, but the quantitative evaluation capability is lost

Engineering Contradiction:

Improveimage qualityVSAvoiddegradation state quantification

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent establishes a feedback loop where the quantitative degradation evaluation results are fed back to guide compensation technology application. The mutual information-based evaluation provides objective feedback on degradation levels, enabling precise adjustment of compensation parameters to optimize image quality while maintaining quantitative assessment capability throughout the process.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12057040B2Apparatus and method for evaluating degradation of display panel and display driver using degradation evaluation value

Publication Date: 2024.08.06 SILICON WORKS CO LTD

AI summary

Disclosed are an apparatus and method for evaluating the degradation of a display panel, for evaluating a degradation state of a display panel, such as mura. The method of evaluating the degradation of a display panel may be implemented by generating mutual information by using a first histogram distribution vector of a reference frame having a target grayscale level and a second histogram distribution vector of an evaluation frame displayed on a display panel in response to the target grayscale level, generating normalized mutual information of the mutual information, providing a weight into which a cognitive characteristic of a distribution of grayscales of pixels of the evaluation frame is incorporated, and outputting an evaluation value obtained by multiplying the normalized mutual information and the weight.