OLED Degradation Compensation via Moving Unit Blocks

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Solution Overview

Problem

Organic light emitting diodes in OLED devices degrade over time, leading to decreased luminance and visible image sticking, which affects display quality due to uneven compensation of degradation across the display panel.

Innovation Solution

A display device and driving method that divide the panel into unit blocks, calculate stress data, and generate compensation data by moving unit blocks to include adjacent pixels, thereby reducing the deviation in display quality by compensating image data based on accumulated stress data.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the display panel is divided into unit blocks for degradation compensation, then the degradation can be compensated locally, but recognizable boundaries appear between unit blocks causing deviation in display quality

Engineering Contradiction:

Improvedegradation compensation accuracyVSAvoiddisplay quality uniformity

Core Design Contradiction:

ReliabilityVSExtent of automation

Solution Approach 1:

The display panel is divided into multiple unit blocks, each containing reference pixels and adjacent pixels. This segmentation allows independent degradation measurement and compensation for each block, improving the accuracy of local degradation compensation while managing the complexity of overall panel compensation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different unit blocks are compensated based on their own accumulated stress data from reference pixels and adjacent pixels, allowing each block to have customized compensation values tailored to its specific degradation characteristics, thereby improving local compensation accuracy without compromising overall display uniformity.

Inventive Principle:

Principle #3Local quality

2Device complexity

If unit blocks are used for stress data calculation, then processing complexity is reduced, but the compensation accuracy for adjacent pixels is insufficient

Engineering Contradiction:

Improvestress data processing complexityVSAvoidpixel degradation measurement accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The display panel is segmented into unit blocks that contain both reference pixels and adjacent pixels. This segmentation reduces processing complexity by limiting stress data calculations to smaller blocks rather than the entire panel, while still capturing degradation information for adjacent pixels through the block's accumulated stress data.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Reference pixels serve as intermediaries to measure degradation stress, and this stress data is then applied to compensate adjacent pixels within the same unit block. This intermediary approach simplifies measurement by focusing on reference pixels while still achieving compensation for the entire block including adjacent pixels.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of operation

If reference pixels are used to calculate stress data, then degradation measurement is simplified, but the compensation does not adequately cover adjacent pixels

Engineering Contradiction:

Improvedegradation measurement simplicityVSAvoidcompensation coverage accuracy

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

Unit blocks are segmented to include both reference pixels and adjacent pixels together. This segmentation allows simplified stress measurement using reference pixels while ensuring that adjacent pixels within the same block receive appropriate compensation based on the block's accumulated stress data.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Reference pixels and adjacent pixels are merged into the same unit block for compensation purposes. The stress data calculated from reference pixels is combined with the block's accumulated stress data to provide comprehensive compensation that covers both reference and adjacent pixels, improving compensation coverage accuracy.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS10803800B2Display device and driving method of the same

Publication Date: 2020.10.13 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes a display panel including pixels, a degradation compensator configured to divide the display panel into one or more unit blocks initially including reference pixels, to calculate a stress data using the unit blocks, and to compensate an image data to generate a compensation data based on an accumulate stress data including an accumulation of the stress data, a data driver configured to generate a data signal based on the compensation data provided from the degradation compensator, and to provide the data signal to the pixels, a scan driver configured to provide a scan signal to the pixels, and a timing controller configured to control the data driver and the scan driver, wherein the degradation compensator is configured to generate the accumulate stress data including the stress data of adjacent pixels that are adjacent to the reference pixels by moving the unit blocks in a moving path.