Pixel Screening and Repair for OLED Displays
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Solution Overview
Problem
Electronic displays, such as LED and OLED displays, often suffer from image artifacts due to defective pixels, which can result in suboptimal image quality and visual disturbances.
Innovation Solution
The system employs signal routing circuitry to bypass malfunctioning pixels and processing circuitry to adjust image data, either by brightening dark defective pixels or dimming bright ones, thereby reducing or eliminating the appearance of defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If signal routing circuitry routes around malfunctioning pixels and processing circuitry adjusts image data, then image quality is improved by reducing visual artifacts, but device complexity increases due to additional circuitry and processing requirements
Solution Approach 1:
The system performs preliminary screening of pixels during manufacturing to identify malfunctioning pixels before the display is deployed. Compensation strategies are pre-configured for identified defective pixels, allowing the display to maintain high image quality without requiring complex real-time detection and adjustment mechanisms during operation.
Solution Approach 2:
Signal routing circuitry acts as an intermediary between the control system and malfunctioning pixels, bypassing defective elements through alternative conduction paths. Processing circuitry serves as another intermediary that mediates between the image source and the display pixels, adjusting image data to compensate for pixel deficiencies without requiring direct modification of the pixel hardware itself.
2Reliability
If compensation strategies are applied to malfunctioning pixels, then reliability of display performance is improved, but ease of manufacture deteriorates due to additional screening and configuration steps
Solution Approach 1:
Pixel screening and compensation configuration are performed as preliminary actions during the manufacturing process, allowing defective pixels to be identified and compensated before the display is shipped. This ensures consistent display performance without requiring post-manufacturing adjustments or complex assembly procedures.
Solution Approach 2:
The display system performs self-diagnosis and self-compensation by automatically detecting malfunctioning pixels and applying appropriate compensation strategies without requiring external intervention. This self-service capability maintains high reliability while minimizing the complexity of the manufacturing process, as the compensation is applied automatically rather than requiring manual configuration for each defective pixel.
Data Source
AI summary
Systems and methods may reduce or eliminate image artifacts due to a defective pixel of an electronic display. An electronic display may include pixels that respectively include a self-emissive element, pixel drive circuitry that supplies a pixel drive current to drive the self-emissive element, and signal routing circuitry that reduces or eliminates a visual artifact due to a defective pixel among the pixels. The signal routing circuitry may do this by turning off the self-emissive element, supplying image data from the pixel drive circuitry to a first adjacent pixel, or receiving image data from other pixel drive circuitry from the first adjacent pixel or a second adjacent pixel.