OLED Sub-Pixel Segmentation for Afterimage Reduction
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Solution Overview
Problem
Organic light emitting diodes (OLEDs) suffer from differential brightness reduction due to material characteristics, leading to accelerated deterioration and afterimages when displaying the same image over time, causing image sticking and reduced picture quality.
Innovation Solution
The OLED display is designed with pixels comprising sub-pixels that are divided into multiple divisional sub-pixels, allowing for alternate light emission within a frame or time cycle, particularly for the blue sub-pixel which deteriorates faster, to reduce overall deterioration speed and prevent afterimages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the same image is continuously displayed at a specific position, then the display function is maintained, but deterioration of the OLED is accelerated and afterimages are generated
Solution Approach 1:
Each sub-pixel is divided into multiple divisional sub-pixels (e.g., first, second, third divisional sub-pixels). These divisional sub-pixels are independently controlled and activated in different time cycles or frames. This segmentation allows the organic light-emitting layer to rest periodically, reducing cumulative deterioration and preventing afterimages while maintaining continuous display functionality.
2Illumination intensity
If sub-pixels emit light continuously, then picture quality is maintained, but brightness reduction occurs due to material deterioration
Solution Approach 1:
The divisional sub-pixels are activated in alternating time cycles or frames rather than continuously. For example, in one frame the first divisional sub-pixel emits light while the second and third remain inactive, then in the next frame the activation pattern shifts. This periodic activation reduces the cumulative stress on the organic light-emitting layer, slowing brightness reduction and extending operational lifespan while maintaining perceived picture quality.
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
This approach reduces the difference in brightness between sub-pixels and prevents afterimages by independently controlling divisional sub-pixels, thereby extending the display's lifespan and maintaining picture quality.
Implementation Method 1
An organic light emitting diode (OLED) emits light by a difference in energy in a process where holes injected through an anode electrode and electrons injected through a cathode electrode are recombined in an organic light emitting layer
Data Source
AI summary
There is provided an organic light emitting display that includes a plurality of pixels are arranged in a plurality of rows and columns Each of the pixels includes a plurality of sub pixels. At least one sub pixel of the plurality of sub pixels of at least one pixel is divided into a plurality of divisional sub pixels. Since the divisional sub pixels alternately emit light, it is possible to reduce deterioration speed of the sub pixels, thereby preventing an afterimage from being generated by deterioration of the sub pixels.