Pixel Deterioration Compensation via Illuminance-Adaptive Voltage Control

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Solution Overview

Problem

Organic light emitting display devices face pixel deterioration over time due to differences in electrical characteristics, leading to image quality issues and reduced lifespan, particularly exacerbated by varying illuminance environments.

Innovation Solution

A display device with a deterioration determination unit, sensing unit, and compensation block that adjusts the target compensation level of pixels based on illuminance, reducing the acceleration of pixel deterioration without compromising image quality by lowering the compensation level in high-illuminance environments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If pixel data is modulated to compensate for pixel deterioration, then image quality is improved, but the data voltage applied to the gate of the driving element increases, accelerating pixel deterioration and reducing pixel lifetime

Engineering Contradiction:

Improveimage qualityVSAvoidpixel lifetime

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The compensation level is dynamically adjusted based on the measured afterimage level. The compensation block modifies the compensation amount according to environmental illuminance conditions, applying stronger compensation when afterimage is severe and reducing compensation when afterimage is minimal, thereby optimizing the balance between image quality and pixel lifetime

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the compensation parameter (compensation level) based on environmental illuminance conditions. In high-illuminance environments where afterimage is less noticeable, the compensation level is reduced, lowering the gate voltage and reducing pixel stress. In low-illuminance environments where afterimage is more visible, the compensation level is increased to maintain image quality

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the target compensation level is increased to compensate for pixel deterioration, then afterimage is reduced, but the acceleration of pixel deterioration increases

Engineering Contradiction:

Improveafterimage reductionVSAvoidpixel deterioration acceleration

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The system applies partial compensation rather than full compensation by adjusting the compensation level according to afterimage severity. When afterimage is not severe (high illuminance), only partial compensation is applied, reducing pixel stress. When afterimage is severe (low illuminance), full compensation is applied to maintain image quality

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The system uses feedback from the afterimage measurement to adjust the compensation level. The compensation block receives information about the afterimage level and environmental illuminance, then dynamically adjusts the compensation amount to achieve optimal balance between afterimage reduction and pixel protection

Inventive Principle:

Principle #23Feedback

3Device complexity

If environmental illuminance is not considered in pixel compensation, then compensation can be simplified, but image quality deteriorates in high-illuminance environments due to unnecessary compensation

Engineering Contradiction:

Improvecompensation complexityVSAvoidimage quality

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The compensation block serves multiple functions: it compensates for pixel deterioration, adjusts compensation based on environmental illuminance, and optimizes the balance between image quality and pixel lifetime. This multi-functional approach eliminates the need for separate compensation circuits for different illuminance conditions

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system incorporates feedback from illuminance sensing to dynamically adjust compensation levels. The compensation block receives illuminance information and automatically adjusts the compensation amount, ensuring optimal image quality across different environmental conditions without requiring manual intervention or complex separate circuits

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS11295675B2Display device and method of compensating pixel deterioration thereof

Publication Date: 2022.04.05 LG DISPLAY CO LTD

AI summary

The present disclosure relates to a display device and a method of compensating pixel deterioration thereof, capable of determining deterioration of pixels and sensing illuminance of a surrounding environment. The pixel deterioration compensation method compensates for deterioration of the pixels with a target compensation level varied according to illuminance. Accordingly, image quality and lifespan of the pixels is improved by mitigating or preventing acceleration of deterioration of the pixels without deteriorating image quality such as afterimages.