Display Current Detection Circuit for Pixel Leakage Measurement
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Solution Overview
Problem
Existing display devices lack the capability to quantitatively measure lateral leakage current between pixels, which affects the determination of panel quality.
Innovation Solution
Incorporation of a current detection device with a controller and a current detection circuit, including first and second drivers with dummy light emitting elements, transistors, and resistors, to measure lateral leakage current between pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a current detection device is added to measure lateral leakage current, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent uses dummy light emitting elements that replicate the structure and electrical characteristics of actual light emitting elements. These dummy elements are positioned adjacent to real pixels and have identical transistor structures, allowing them to experience the same lateral leakage current conditions without affecting normal display operation. The dummy elements serve as copies for measurement purposes only.
Solution Approach 2:
The current detection device is segmented into separate functional components: dummy light emitting elements for current experience, detection circuits for measuring current, and controller for coordinating operations. This segmentation allows the measurement function to be added without integrating into the main display pixel structure, thereby reducing overall device complexity while maintaining measurement capability.
2Measurement precision
If dummy light emitting elements are added for current detection, then measurement precision is improved, but manufacturing complexity increases
Solution Approach 1:
The dummy light emitting elements are merged with the existing pixel circuit structure during the same manufacturing process. The dummy elements share the same transistor fabrication steps, electrode patterning, and encapsulation processes as the actual light emitting elements. This merging approach allows the measurement structure to be created without additional manufacturing steps, maintaining ease of production while enabling precise measurements.
Data Source
AI summary
A display device includes: a display panel including a display area and a non-display area; a plurality of light emitting elements in the display area; and a current detection device in the non-display area. The current detection device includes a controller, and a current detection circuit to be controlled by the controller. The current detection circuit includes a first driver and a second driver; the first driver includes a first dummy light emitting element corresponding to a first light emitting element to provide light of a first color among the plurality of light emitting elements; and the second driver includes a second dummy light emitting element corresponding to a second light emitting element to provide light of a second color among the plurality of light emitting elements.