Display Apparatus Afterimage Correction via Saturation Adjustment

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Solution Overview

Problem

Organic light emitting display apparatuses face afterimage issues due to electrical stress and emission time, leading to luminance deviation and degraded image quality, which existing solutions attempt to address by adjusting luminance but often result in non-uniformity and further quality degradation.

Innovation Solution

A display apparatus comprising an afterimage detecting part to identify affected areas, a saturation adjusting part to correct saturation levels, and a display panel to display the adjusted data, ensuring minimal afterimage occurrence without compromising picture quality by using a combination of afterimage detection and saturation adjustment methods.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If luminance is adjusted to address the afterimage issue, then afterimage limitation is reduced, but luminance uniformity deteriorates and image quality is degraded

Engineering Contradiction:

Improveafterimage limitationVSAvoidluminance uniformity

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent applies local quality by differentiating processing between afterimage areas and non-afterimage areas. The saturation adjusting part selectively adjusts saturation only in detected afterimage areas while maintaining original saturation in other areas, thereby addressing afterimage issues locally without causing global luminance non-uniformity or image quality degradation

Inventive Principle:

Principle #3Local quality

2Reliability

If saturation is reduced to minimize afterimage, then afterimage limitation is reduced, but color accuracy may deteriorate

Engineering Contradiction:

Improveafterimage limitationVSAvoidcolor accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent selectively adjusts saturation only in afterimage areas identified by the afterimage detecting part, while leaving saturation unchanged in non-afterimage areas. This localized approach minimizes afterimage effects without compromising overall color accuracy of the display image

Inventive Principle:

Principle #3Local quality

3Productivity

If organic light emitting element operates continuously, then productivity is improved, but electrical stress causes deterioration and afterimage issues

Engineering Contradiction:

Improvecontinuous operation capabilityVSAvoidelement deterioration

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent converts the harmful effect of electrical stress-induced saturation increase into a beneficial detection signal. The afterimage detecting part identifies areas with increased saturation due to electrical stress, and the saturation adjusting part compensates by reducing saturation in these areas, thereby converting the harmful deterioration effect into a correctable condition that maintains display reliability during continuous operation

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS20230316997A1Display apparatus

Publication Date: 2023.10.05 LG DISPLAY CO LTD

AI summary

A display apparatus can include an afterimage detecting part configured to detect a first data of an afterimage area from an image data, a saturation adjusting part configured to adjust a saturation of the first data of the afterimage area detected by the afterimage detecting portion and convert the first data into a second data, and a display panel including a plurality of pixels configured to display a data including the second data output from the saturation adjusting part.