OLED Sub-pixel Step Compensation for Light Leakage and Short Circuit
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Solution Overview
Problem
Organic light emitting display devices face light leakage defects due to the absence of color filters in white sub-pixels, leading to increased risk of short circuits between electrodes and signal lines when attempting to reduce light leakage by removing flat films.
Innovation Solution
The implementation of step compensation portions with color patterns between sub-pixels, specifically between red and white sub-pixels, and between white and blue sub-pixels, to increase the distance between electrodes and data lines, reducing light leakage and short circuit risks while maintaining light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the flat film around the sub-pixel is removed to reduce light leakage, then light leakage is suppressed, but the risk of short circuit defect between electrodes and signal lines increases
Solution Approach 1:
The invention divides the protective structure into multiple segments: the flat film is segmented to be removed only from specific regions around sub-pixels, while remaining intact in other areas. Additionally, a new protective layer is introduced to replace the removed flat film in critical areas, creating a multi-layer protective system that selectively addresses light leakage while preserving electrical insulation where needed.
Solution Approach 2:
The invention introduces an intermediary protective layer that mediates between the conflicting requirements of light leakage suppression and short circuit prevention. This intermediate layer is positioned between the removed flat film regions and the underlying electrodes/signal lines, providing the necessary electrical insulation while allowing the flat film to be removed for light leakage control.
2Object-affected harmful factors
If color filters are disposed in all sub-pixels to prevent light leakage, then light leakage is reduced, but the manufacturing complexity and cost increase
Solution Approach 1:
The invention applies different structural modifications to different regions of the display panel. Specifically, the flat film removal and protective layer formation are applied only in regions where sub-pixels are adjacent to white sub-pixels, rather than uniformly across the entire panel. This localized approach addresses light leakage problems where they occur most frequently while minimizing additional manufacturing complexity in other areas.
Data Source
AI summary
Embodiments relate to an organic light emitting display device according to the present disclosure including: a plurality of pixels which includes red, white, blue, and green sub-pixels; driving transistor, each of which is disposed in each sub-pixel; and organic light emitting diodes, each of which is disposed corresponding to each sub-pixel, wherein a first step portion, first and second bank layers, and a first step compensation portion are disposed between the white sub-pixel and a sub-pixel adjacent thereto, thereby having an effect of suppressing a short circuit defect and a light leakage defect. In addition, an organic light emitting display device according to the present disclosure includes: red, white, blue, and green sub-pixels; at least one step portion between the sub-pixels; first and second bank layers; and a step compensation portion, thereby having an effect of suppressing a short circuit defect and a light leakage defect.