OLED Display Light-Induced Deterioration Compensation
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Solution Overview
Problem
Organic light emitting diode (OLED) display devices experience light-induced deterioration, leading to uneven luminance and TFT degradation due to lost light propagating within and between pixels, which affects the display's performance and longevity.
Innovation Solution
A method and system for compensating light-induced deterioration in OLED displays, involving a light-induced deterioration compensation unit that analyzes image signals, predicts potential deterioration, and applies gray level compensating values to non-light emitting pixels to prevent TFT degradation and maintain even luminance, using a timing controller and data driver to adjust image data and generate compensated image data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If light emission is controlled for each pixel area using TFT and partition walls, then independent pixel driving is achieved, but light-induced deterioration occurs in non-emitting pixels due to propagated light
Solution Approach 1:
The patent applies preliminary action by compensating for light-induced deterioration before it causes significant damage. The compensation unit predicts potential deterioration based on image signals and proactively adjusts gray levels of non-emitting pixels to prevent TFT degradation, rather than waiting for deterioration to occur
Solution Approach 2:
The patent implements feedback through the light-induced deterioration compensation unit that continuously monitors image signals, predicts deterioration patterns, and adjusts gray levels accordingly. This closed-loop approach uses display content information to dynamically compensate for potential damage to non-emitting pixels
2Reliability
If partition walls are formed higher than pixel electrodes to prevent short circuits, then pixel isolation is improved, but light propagation between pixels increases causing deterioration
Solution Approach 1:
The patent introduces an intermediary compensation mechanism that mediates between the need for pixel isolation and the harmful light propagation. The compensation unit acts as an intermediary system that processes image signals and adjusts gray levels to counteract the harmful effects of light propagation, without modifying the physical partition wall structure
3Reliability
If gray level compensation is applied to non-light emitting pixels, then TFT degradation is reduced, but display complexity increases
Solution Approach 1:
The patent applies universality by designing the compensation unit to perform multiple functions: predicting light-induced deterioration, calculating compensation values, and adjusting gray levels all within a single integrated component. This multi-functional approach reduces overall system complexity compared to having separate units for each function
Data Source
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AI summary
An organic light emitting diode (OLED) display device includes an OLED display panel having gate lines, data lines intersecting the gate lines, and a plurality of pixels connected to the gate lines and the data lines. A timing controller receives an image signal that includes a plurality of frames and outputs image data based on the plurality of frames. A data driver generates a data signal voltage corresponding to the image data output from the timing controler. When the image signal includes a black image signal to one pixel of the plurality of pixels that continues for at least a predetermined plurality of frames, the timing controller outputs a first image data in which the black image signal has been converted to a first gray level value that is greater than a gray level value of the black image signal.