AMOLED Gamma Correction via Voltage Extraction

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Solution Overview

Problem

Conventional gamma correction methods for AMOLED display modules require a long time to adjust optical parameters for numerous associated points, significantly affecting production efficiency.

Innovation Solution

A method and device that determine the highest and lowest data voltages for each gray scale, select alternative gamma register values based on these voltages, and adjust gamma register values to target curves, allowing for efficient gamma correction by utilizing the relation between brightness and data voltage, thereby reducing the time needed for the process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional gamma correction methods adjust optical parameters for numerous associated points, then gamma correction precision is improved, but correction time increases significantly

Engineering Contradiction:

Improvegamma correction precisionVSAvoidcorrection time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent extracts only the essential parameters (highest and lowest data voltages) from the complete set of gray scale associated points. By taking out only these critical voltage points and using them to determine alternative gamma register values, the system achieves gamma correction without needing to adjust all numerous associated points individually, thus significantly reducing correction time while maintaining precision.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent performs preliminary determination of alternative gamma register values based on the highest and lowest data voltages before the actual gamma correction process. This preliminary action allows the system to prepare correction parameters in advance, reducing the time required during the main correction process by avoiding sequential adjustment of all gray scale points.

Inventive Principle:

Principle #10Preliminary action

2Manufacturing precision

If gamma correction is performed for all associated points, then correction accuracy is improved, but production efficiency deteriorates

Engineering Contradiction:

Improvecorrection accuracyVSAvoidproduction efficiency

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The patent takes out only the critical highest and lowest data voltage points from the complete set of gray scale associated points. By focusing correction efforts on these essential voltage points and using them to determine alternative gamma register values, the system achieves accurate gamma correction without needing to process all numerous associated points, thus maintaining correction accuracy while significantly improving production efficiency.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the approach from adjusting optical parameters for all associated points to determining alternative gamma register values based on voltage parameters. This parameter change allows the system to achieve correction accuracy through voltage-based determination rather than exhaustive optical parameter adjustment, thereby improving production efficiency.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If numerous associated points are adjusted individually, then gamma correction completeness is improved, but processing time increases

Engineering Contradiction:

Improvecorrection completenessVSAvoidprocessing time

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The patent extracts only the essential highest and lowest data voltages from the complete set of gray scale associated points. By taking out these critical voltage points and using them to determine alternative gamma register values, the system achieves complete gamma correction without needing to process all numerous associated points individually, thus maintaining correction completeness while significantly reducing processing time.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent performs preliminary determination of alternative gamma register values based on the highest and lowest data voltages before the actual correction process. This preliminary action allows the system to prepare correction parameters in advance, reducing the time required during the main correction process by avoiding sequential adjustment of all gray scale points while maintaining completeness.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS10269286B2Gamma correction method and gamma correction device for display module

Publication Date: 2019.04.23 BOE TECHNOLOGY GROUP CO LTD

AI summary

Embodiments of the present disclosure provide gamma correction method and device for a display module. The gamma correction method includes: determining, for each sub-pixel of a display module to be corrected, the highest data voltage and the lowest data voltage after gamma correction of the highest gray scale and the lowest gray scale of the display module; determining at least one set of alternative gamma register values that are capable of performing gamma correction of the display module; determining at least one set of gamma register values to be corrected for respective gray scales before the gamma correction of the display module; and performing gamma correction of the display module by adjusting the gamma register value corresponding to the gray scale to be corrected which needs to perform gamma correction.