Sub-Pixel Electrode Layout for Repairable Dual-Emitter Displays
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Solution Overview
Problem
Display devices face challenges in easily repairing defective sub-pixels, particularly those with color mixing defects, as existing methods require complex structures and separate repair processes, which complicate the integration of light emitting elements with different sizes and functionalities.
Innovation Solution
A display device design that includes a substrate with sub-pixels having a pixel circuit, a first light emitting element on one side, and a second light emitting element on the other, connected by a pixel electrode, allowing for easy repair through a welding process using assembly electrodes without a separate repair structure, enabling connection to a normally driven pixel circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If a separate repair structure is added to enable repair of defective sub-pixels, then ease of repair is improved, but device complexity increases
Solution Approach 1:
The pixel electrode is designed to serve dual purposes: it functions as a standard electrode during normal display operation and as a repair electrode during defective sub-pixel repair. By making the pixel electrode multi-functional, the patent eliminates the need for separate repair structures, thereby improving ease of repair while avoiding increased device complexity
Solution Approach 2:
The patent merges the repair function with the existing pixel electrode structure. Instead of adding a separate repair electrode or repair circuit, the design combines the repair functionality into the already-present pixel electrode, which naturally extends to the light emitting elements. This merging approach enables repair capability without introducing additional structural complexity
2Adaptability or versatility
If light emitting elements with different sizes are used, then adaptability is improved, but manufacturing precision becomes more difficult
Solution Approach 1:
The patent implements a dynamic repair approach where the pixel electrode can be selectively connected or disconnected from different light emitting elements based on their operational status. This dynamic connectivity allows the system to adapt to various light emitting element sizes and defect scenarios, enabling flexible repair strategies that accommodate size variations without compromising manufacturing precision
Solution Approach 2:
The patent applies local quality by allowing different regions of the pixel electrode to have different connection states. Specifically, the pixel electrode can be connected to functional light emitting elements while being disconnected from defective ones, enabling localized repair actions that respect the specific size and functional characteristics of each light emitting element without requiring uniform manufacturing across all elements
3Reliability
If a complex repair process is implemented, then reliability is improved, but ease of operation worsens
Solution Approach 1:
The patent extracts the repair functionality from complex separate repair circuits and procedures, isolating it into the simple, existing pixel electrode structure. By taking out the repair function from complex systems and embedding it in the already-simple pixel electrode, the design achieves reliable repair capability while maintaining ease of operation
Solution Approach 2:
The pixel electrode structure enables self-service repair capabilities where the display device can identify and repair defective sub-pixels using its own existing electrodes without requiring external complex repair equipment or procedures. The pixel electrode automatically serves the dual purpose of display operation and repair, making the repair process simpler and more accessible
Data Source
AI summary
A display device includes a substrate including a plurality of sub-pixels, a pixel circuit disposed in each of the plurality of sub-pixels on the substrate, a first light emitting element disposed in each of the plurality of sub-pixels, disposed on one side of the pixel circuit, and including a first electrode, a semiconductor layer, and a second electrode, a second light emitting element disposed in each of the plurality of sub-pixels, disposed on the other side of the pixel circuit, and including a first electrode, a semiconductor layer, and a second electrode and a pixel electrode electrically connected to the pixel circuit and extending to the first light emitting element and the second light emitting element, thus a defective light emitting element of the sub-pixel can be easily repaired.