Dummy Pixel Circuit Repair for OLED Image Quality
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Solution Overview
Problem
Existing organic light-emitting display technologies face challenges in efficiently repairing defective pixels without requiring additional memory and timing circuits, as defective pixels can either always emit light or never emit light, leading to visible bright or dark spots.
Innovation Solution
The implementation of a system with dummy pixels and repair lines that allow for selective electrical connection between defective pixels and dummy pixels, using low-resistivity dummy wiring to bypass the defective pixel circuit, enabling the dummy pixel circuit to drive the light emitting device and maintain image quality without additional timing circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dummy pixels are used to repair defective pixels, then image quality is improved, but device complexity increases due to additional memory and timing circuits
Solution Approach 1:
The patent extracts the pixel circuit functionality from the defective pixel and relocates it to a dummy pixel. The dummy pixel circuit is separated from the main pixel array and can be independently controlled, allowing defective pixels to be repaired without adding complexity to the main display circuitry. This extraction approach enables repair while maintaining the original device architecture.
Solution Approach 2:
The patent introduces repair lines as intermediary conductors that connect dummy pixel circuits to defective pixel locations. These repair lines act as mediators, allowing the dummy pixel circuit to drive the light emitting device of the defective pixel without requiring direct integration into the main pixel array, thus avoiding additional memory and timing circuits.
2Ease of repair
If repair lines are used to connect dummy pixels to defective pixels, then ease of repair is improved, but device complexity increases
Solution Approach 1:
The patent prepares repair lines in advance during manufacturing, positioning them to connect dummy pixels with potential defective pixel locations. These repair lines are pre-configured but not activated during normal operation. When a defective pixel is identified, the corresponding repair line is selectively connected, enabling quick repair without requiring complex real-time routing or additional control circuitry.
3Reliability
If dummy wiring with lower resistivity is used, then electrical conductivity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies different material properties to different parts of the wiring structure. Dummy wiring is specifically designed with lower resistivity materials compared to standard pixel wiring, optimizing electrical conductivity for the repair function. This localized quality enhancement is applied only where needed (in the dummy area and repair paths) without requiring high-precision manufacturing across the entire display structure.
Data Source
AI summary
A display apparatus includes an array of pixels and dummy pixels. A plurality of first lines are connected to the pixels and the dummy pixels. A plurality of repair lines are connected to the dummy pixels and are selectively connected to the pixels. A plurality of second lines are connected to the pixels. At least one dummy line is connected to the dummy pixels. At least one dummy wiring is connected to the at least one dummy line and is selectively connected to one of the second lines.