Pixel Resistance Measurement Layout for Defect-Safe Display Electrodes
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Solution Overview
Problem
Existing display devices face challenges in detecting defective pixels without damaging the electrodes, which is crucial for maintaining the integrity and performance of the display.
Innovation Solution
A display device design that includes a light emitting area, a non-light emitting area, and a separation area with specific electrode configurations and insulation layers, allowing for the measurement of pixel resistance through contact electrodes in the separation area without direct contact with alignment electrodes, thereby preventing electrode damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contact electrodes are disposed in the light emitting area to measure pixel resistance, then defect detection capability is improved, but alignment electrodes may be damaged
Solution Approach 1:
The display device is divided into three distinct areas: light emitting area, non-light emitting area, and separation area. The contact electrodes are specifically disposed in the separation area, which is spaced apart from the light emitting area, thereby segmenting the measurement function from the light emission function and preventing damage to alignment electrodes during resistance measurement.
Solution Approach 2:
The separation area acts as an intermediary zone between the light emitting area and the non-light emitting area. By placing contact electrodes in this intermediate region, the patent enables resistance measurement without direct contact with the alignment electrodes in the light emitting area, thus preventing electrode damage while maintaining defect detection capability.
2Object-affected harmful factors
If contact electrodes are disposed in the non-light emitting area, then electrode damage is prevented, but additional space is required
Solution Approach 1:
The separation area is specifically designed with local quality characteristics - it is spaced apart from the light emitting area but connected to the non-light emitting area. This localized region provides the necessary space for contact electrodes while maintaining the overall compact structure of the display device, thus preventing electrode damage without requiring excessive additional space.
3Ease of operation
If alignment electrodes are directly contacted for resistance measurement, then measurement process is simplified, but electrode integrity is compromised
Solution Approach 1:
The separation area serves as an intermediary zone that enables resistance measurement without direct contact with alignment electrodes. Contact electrodes in the separation area can measure pixel resistance through the pixel structure without compromising the integrity of the alignment electrodes, thus maintaining both measurement simplicity and electrode integrity.
Data Source
AI summary
A display device includes a light emitting area, a non-light emitting area surrounding the light emitting area, and a separation area spaced apart from the light emitting area, the non-light emitting area disposed between the light emitting area and the separation area; a bank disposed in the non-light emitting area; a first alignment electrode and a second alignment electrode that extend from the light emitting area through the non-light emitting area to the separation area; light emitting elements electrically connected to at least one of the first alignment electrode and the second alignment electrode; a first contact electrode disposed in the separation area and electrically connected to the first alignment electrode; and a second contact electrode disposed in the separation area and electrically connected to the second alignment electrode.