Display Pixel Repair Layout for Non-Transfer Defect Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices struggle to efficiently detect and repair defective sub pixels, particularly those where a light emitting element is not transferred, leading to reduced yields and image quality.
Innovation Solution
A display device design that incorporates a sensing transistor to detect defective sub pixels, a repair sub pixel with an additional light emitting element, and a mechanism to short-circuit the sensing layer and connection electrodes to sense non-transfer failures, allowing for the transfer of an additional light emitting element to repair defective sub pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensing transistor is added to detect defective sub pixels, then detection capability is improved, but device complexity increases
Solution Approach 1:
The pixel array is divided into functional sub pixels (R, G, B) and dedicated repair sub pixels. Each sub pixel type has its own sensing transistor and repair mechanism, allowing independent detection and repair of defective elements without affecting other color channels.
Solution Approach 2:
Sensing transistors are introduced as intermediary components between the light emitting elements and the readout circuitry. These sensing transistors act as mediators that detect the electrical state of each sub pixel and trigger appropriate repair actions through the repair sub pixels.
2Ease of repair
If repair sub pixels with additional light emitting elements are implemented, then repair capability is improved, but device complexity increases
Solution Approach 1:
The repair mechanism utilizes parameter changes in the electrical state of sensing transistors and connection electrodes to detect and repair defective sub pixels. By monitoring voltage levels and electrical connectivity, the system identifies non-transfer failures and activates appropriate repair sub pixels.
Solution Approach 2:
Repair sub pixels with additional light emitting elements are pre-configured and positioned adjacent to groups of sub pixels of the same color. This preliminary arrangement allows immediate repair of defective sub pixels without requiring complex real-time reconfiguration or additional manufacturing steps.
3Measurement precision
If sensing layer and connection electrodes are short-circuited to sense non-transfer failures, then detection accuracy is improved, but manufacturing precision requirements increase
Solution Approach 1:
The sensing mechanism utilizes the inherent electrical properties of the display structure itself. By short-circuiting the sensing layer and connection electrodes in specific patterns, the system creates self-diagnostic capabilities that leverage the existing electrical pathways rather than requiring external detection equipment.
Data Source
AI summary
A display device comprises a substrate having a plurality of sub pixels and one or more repair sub pixels disposed thereon, a high potential power line disposed in the plurality of sub pixels and the repair sub pixels, a driving transistor disposed in each of the plurality of sub pixels and each of the repair sub pixels, a sensing layer disposed on the high potential power line in each of the plurality of sub pixels and each of the repair sub pixels, an insulation layer disposed on the sensing layer in the plurality of sub pixels and the repair sub pixels, a light emitting element disposed between the sensing layer and the insulation layer in each of the plurality of sub pixels, and an additional light emitting element disposed on the insulation layer in the repair sub pixels.