Display Device Deterioration Compensation via Target Luminance Control

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Solution Overview

Problem

Organic light emitting display devices experience luminance deterioration over time, leading to increased power consumption and accelerated degradation due to higher current requirements to maintain initial luminance, which results in noticeable image quality issues and reduced device lifespan.

Innovation Solution

A display device with a deterioration compensating unit that calculates a gain value and dimming weight based on sensing voltage to modulate data and adjust sub-pixel luminance, compensating for deterioration by reducing overall luminance to minimize power consumption and prevent accelerated degradation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If the current applied to sub pixels is increased to maintain initial luminance after deterioration, then the luminance is maintained, but the power consumption increases and deterioration is accelerated

Engineering Contradiction:

ImproveluminanceVSAvoidpower consumption

Core Design Contradiction:

Illumination intensityVSUse of energy by moving object

Solution Approach 1:

The patent changes the luminance parameter from initial luminance to target luminance (which is lower than initial luminance). By adjusting the target luminance parameter, the system compensates for deterioration without requiring excessive current increase, thus controlling power consumption while maintaining acceptable display quality

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

Instead of fully compensating for deterioration by restoring initial luminance (excessive action), the patent applies partial compensation by setting target luminance to a level that provides acceptable image quality without fully restoring the original state, thereby avoiding the harmful effects of excessive current and power consumption

Inventive Principle:

Principle #16Partial or excessive action

2Illumination intensity

If the current applied to sub pixels is increased to maintain initial luminance after deterioration, then the luminance is maintained, but the deterioration rate is accelerated

Engineering Contradiction:

ImproveluminanceVSAvoiddeterioration rate

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The patent modifies the luminance parameter from initial luminance to target luminance (lower than initial). This parameter change allows compensation for deterioration without applying excessive current that would accelerate degradation, thus preserving device reliability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies partial compensation rather than full restoration. By setting target luminance to a level below initial luminance, the system provides sufficient compensation for deterioration without the harmful effects of excessive current application, preventing accelerated deterioration

Inventive Principle:

Principle #16Partial or excessive action

3Use of energy by moving object

If the luminance of all sub pixels is decreased to target luminance, then the power consumption is reduced, but the luminance of deteriorated sub pixels may still differ from non-deteriorated sub pixels

Engineering Contradiction:

Improvepower consumptionVSAvoidluminance uniformity

Core Design Contradiction:

Use of energy by moving objectVSIllumination intensity

Solution Approach 1:

The patent applies different compensation strategies to different sub pixels. Deteriorated sub pixels receive compensation through gain adjustment to reach target luminance, while non-deteriorated sub pixels are simply dimmed to target luminance. This local differentiation ensures uniformity while controlling power consumption

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11741867B2Display device for preventing deterioration and method of compensating thereof

Publication Date: 2023.08.29 LG DISPLAY CO LTD

AI summary

A display device includes a display panel including a plurality of sub pixels, a deterioration compensating unit configured to compensate for a deteriorated sub pixel based on a sensing voltage inputted from the display panel and dimming the plurality of sub pixels responsive to the compensation, and a memory configured to store a lookup table, the lookup table including gain, deterioration compensating timing, and target luminance.