Dual-Emitter Display Subpixels for Dark-Spot Prevention
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Solution Overview
Problem
The formation of external particles during the manufacturing of organic light emitting display devices can lead to short circuits between the anode and cathode, resulting in defective pixels with dark spots, which may recur even after aging processes.
Innovation Solution
A display device design featuring a display panel with sub-pixels that include separate first and second light emitting units connected to different low-potential voltage lines, ensuring the cathodes of these units are spaced apart to prevent short circuits, and a repair mechanism to detect and address defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single light emitting device is used per sub-pixel, then the device complexity is low, but the reliability is poor due to particle contamination causing dark spots
Solution Approach 1:
The patent divides each sub-pixel into two separate light emitting devices (first and second light emitting devices) with independent anodes and cathodes. This segmentation ensures that if one device fails due to particle contamination, the other can still function, thereby improving pixel reliability without requiring complex repair mechanisms.
Solution Approach 2:
The patent applies different voltage lines (first low-potential voltage line and second low-potential voltage line) to the cathodes of the two light emitting devices within the same sub-pixel. This local differentiation in voltage supply creates independent control zones that prevent short circuits between devices while maintaining their functional independence.
2Device complexity
If the cathodes of light emitting devices are closely spaced to reduce device complexity, then the manufacturing process is simpler, but the risk of short circuit increases
Solution Approach 1:
The patent segments the voltage supply system into separate first and second low-potential voltage lines that independently supply voltage to the cathodes of different light emitting devices. This segmentation physically separates the voltage paths, preventing short circuits even when cathodes are closely spaced, while maintaining relatively simple device structure.
3Manufacturing precision
If particle penetration is prevented during manufacturing, then the manufacturing precision is maintained, but external particles may still enter during aging process
Solution Approach 1:
The patent incorporates a protective layer over the light emitting layer before forming the cathode. This preliminary protective measure prevents particle penetration during the manufacturing process and continues to protect during the aging process, eliminating the need for complex post-manufacturing repair mechanisms.
Solution Approach 2:
The protective layer acts as a cushioning barrier that absorbs or blocks particle contamination before it can reach the light emitting layer. This beforehand protection ensures that even during the aging process, particles cannot cause short circuits or dark spots, maintaining manufacturing precision throughout the device lifecycle.
Data Source
AI summary
A display device is provided, one sub-pixel including a first light emitting device that receives a first low-potential voltage and a second light emitting device that receives a second low-potential voltage. In addition, a display device is provided, wherein in one sub-pixel, first electrodes of first and second light emitting devices are connected with one and a same thin film transistor, and second electrodes of the first and second light emitting devices are spaced apart.