Display Subpixel Life Controller for Uniform Degradation
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Solution Overview
Problem
Organic light emitting display devices face non-uniformity in element performance and lifespan due to process variations and environmental factors, leading to uneven degradation and reduced display panel life, necessitating a compensation method to maintain uniform degradation across all subpixels.
Innovation Solution
A display device with a life controller that calculates usage data and life characteristics of subpixels, adjusting compensation and delay rates to ensure all elements degrade at a uniform rate, using a rate matching unit to multiply usage data by a constant calculated from reference life data, thereby controlling the degradation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard compensation methods are used without considering element life variations, then manufacturing and operation are simpler, but non-uniform degradation occurs across subpixels reducing display panel life
Solution Approach 1:
The patent applies local quality by differentiating compensation rates based on the specific life characteristics of each subpixel or region. The life controller adjusts compensation parameters individually for different areas of the display panel according to their measured life data, ensuring that each region receives tailored compensation rather than a uniform approach. This resolves the contradiction by maintaining high reliability through localized optimization while managing complexity through systematic regional differentiation.
Solution Approach 2:
The patent changes the compensation rate parameter dynamically based on life data measurements. The life controller modifies compensation parameters (such as gamma correction values or driving current adjustments) according to the actual life characteristics of display elements. This parameter adaptation allows the system to achieve uniform degradation and extended panel life while keeping the control mechanism manageable through automated parameter adjustment based on measured data.
2Reliability
If compensation is performed without reflecting life characteristics, then the compensation algorithm is simpler, but degradation differences between subpixels increase
Solution Approach 1:
The patent implements feedback by measuring the life characteristics of display elements and using this information to adjust compensation rates. The life controller continuously monitors degradation patterns and modifies compensation parameters accordingly, creating a closed-loop system. This feedback mechanism ensures uniform degradation across subpixels by actively responding to measured life variations, while the automated nature of the feedback process manages the complexity of precise measurements.
3Ease of operation
If uniform compensation rate is applied to all subpixels, then control is simpler, but elements with different initial life degrade at different rates causing non-uniformity
Solution Approach 1:
The patent applies dynamics by making the compensation rate adjustable and adaptive rather than fixed. The life controller dynamically modifies compensation parameters based on real-time or periodic life measurements, allowing the system to respond to actual degradation patterns. This dynamic approach maintains ease of operation through automated control while achieving degradation uniformity by adapting to the specific life characteristics of each region.
Data Source
AI summary
The present disclosure a display device includes: a display panel including subpixels displaying an image; and a life controller controlling at least any one of a compensation rate and a delay rate of the subpixels on the basis of usage data obtained by calculating usage of the display panel and life data of the subpixels.