OLED Display Afterimage Compensation via Stress Data Accumulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic light emitting display devices face deterioration in emission efficiency over time, leading to luminance decrease and afterimage issues due to uneven pixel degradation, compounded by compression loss accumulation, which affects picture quality and requires effective compensation methods.
Innovation Solution
An organic light emitting display device with a controller that includes a data compensator to estimate and recover accumulated stress data by converting input image data into stress data, compressing and restoring it in lossless and lossy manners to determine compensation values, and control drivers for efficient afterimage compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If OLEDs are operated continuously to display images, then the display device can function normally, but the OLEDs deteriorate over time causing emission efficiency decrease and luminance decrease
Solution Approach 1:
The patent applies preliminary action by accumulating stress data before significant deterioration occurs. The data compensator continuously accumulates stress data corresponding to image data applied to OLEDs, enabling early detection and compensation of deterioration trends before they manifest as visible afterimages or performance degradation.
Solution Approach 2:
The patent implements feedback by using accumulated stress data to generate compensation values that are applied back to the display system. The data compensator generates compensated image data based on accumulated stress data, creating a closed-loop system that continuously adjusts for OLED deterioration to maintain display quality.
2Quantity of substance
If compensation data is accumulated and compressed to manage storage, then storage efficiency improves, but compression loss accumulates causing afterimage and picture quality deterioration
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the accumulation counter and compensation values based on stress data characteristics. The system modifies compensation parameters adaptively, changing the magnitude and application of compensation values based on accumulated stress levels, thereby optimizing both compression efficiency and compensation accuracy.
Solution Approach 2:
The patent implements partial action by applying compensation selectively based on accumulated stress data thresholds. Rather than compensating all pixels uniformly, the system applies compensation values proportionally to the accumulated stress levels, focusing compensation resources on pixels showing greater deterioration signs while maintaining overall picture quality.
3Measurement precision
If stress data is accumulated precisely to improve compensation accuracy, then afterimage compensation improves, but data storage requirements and processing complexity increase
Solution Approach 1:
The patent applies local quality by treating different regions and pixels with differentiated compensation strategies. The data compensator accumulates and processes stress data independently for different pixels and regions, applying locally-optimized compensation values based on individual stress accumulation patterns rather than uniform global compensation.
Solution Approach 2:
The patent implements segmentation by dividing the compensation process into distinct functional units: stress data accumulation, loss recovery, compensation value generation, and compensated data output. The data compensator is structured as multiple functional blocks that process different aspects of compensation independently, reducing overall system complexity through modular design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents loss accumulation, estimates previous loss data, and extends the device's lifespan by efficiently compensating for afterimage caused by OLED deterioration, improving picture quality and extending the device's usage period.
Implementation Method 1
the organic light emitting display device displays images using organic light emitting diodes (OLEDs) that generate light according to recombination of electrons and holes
Data Source
AI summary
The present disclosure relates to an organic light emitting display device. The device includes, among others, a controller including a data compensator configured to accumulate stress data applied to organic light emitting diodes (OLEDs) on the basis of input image data, to generate accumulated stress data under a condition for recovery of accumulated loss in a loss region, to compress and restore the accumulated stress data in a lossless manner and a loss manner to determine a compensated value and to output the compensated value. Accordingly, it is possible to estimate previous loss data on the basis of new image data to be currently accumulated, recover loss and accumulate data to prevent accumulation of loss and efficiently compensate for afterimage due to deterioration of OLEDs to extend the period of use.