LED Display Alignment Key Layout to Minimize Sensor Interference
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Solution Overview
Problem
Existing display devices face challenges in improving the transfer precision of light emitting diodes (LEDs) due to medium changes in the sensing area of displacement sensors and spectral interference, which lead to alignment errors and reduced manufacturing efficiency.
Innovation Solution
The display device incorporates a substrate with a specific arrangement of inorganic and organic insulating layers, where organic layers are disposed on inorganic layers in areas overlapping alignment keys, minimizing medium changes and spectral interference in the sensing area of displacement sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple insulating layers are stacked in the sensing area of displacement sensor, then encapsulation and protection are improved, but medium change and spectral interference increase causing alignment error
Solution Approach 1:
The insulating layers are segmented into two distinct groups: a first group stacked in the active area and a second group stacked in the non-active area. This spatial segmentation prevents medium changes and spectral interference in the sensing area while maintaining encapsulation and protection functions throughout the device.
Solution Approach 2:
Different areas of the device are assigned different layer configurations tailored to their specific functions. The active area receives the first set of insulating layers for electrical isolation, while the non-active area receives the second set for encapsulation, ensuring each area has the appropriate properties without compromising the other.
2Reliability
If organic insulating layer is disposed between inorganic insulating layers in sensing area, then insulation performance is improved, but spectral interference increases causing transfer error
Solution Approach 1:
The insulating layers are segmented into two distinct groups: a first group stacked in the active area and a second group stacked in the non-active area. This spatial segmentation prevents medium changes and spectral interference in the sensing area while maintaining encapsulation and protection functions throughout the device.
Solution Approach 2:
Different areas of the device are assigned different layer configurations tailored to their specific functions. The active area receives the first set of insulating layers for electrical isolation, while the non-active area receives the second set for encapsulation, ensuring each area has the appropriate properties without compromising the other.
3Ease of operation
If alignment keys are disposed in sensing area, then alignment function is improved, but medium change causes spectral interference and alignment error
Solution Approach 1:
The insulating layers are segmented into two distinct groups: a first group stacked in the active area and a second group stacked in the non-active area. This spatial segmentation prevents medium changes and spectral interference in the sensing area while maintaining encapsulation and protection functions throughout the device.
Solution Approach 2:
The non-active area serves as an intermediary zone that hosts the alignment keys without introducing harmful medium changes to the sensing area. The alignment keys are positioned in this intermediate region where they can perform their alignment function without interfering with the optical sensing process in the active area.
4Reliability
If complete insulating layer coverage is applied, then protection is improved, but process complexity and manufacturing difficulty increase
Solution Approach 1:
The insulating layers are segmented into two distinct groups: a first group stacked in the active area and a second group stacked in the non-active area. This spatial segmentation prevents medium changes and spectral interference in the sensing area while maintaining encapsulation and protection functions throughout the device.
Solution Approach 2:
Different areas of the device are assigned different layer configurations tailored to their specific functions. The active area receives the first set of insulating layers for electrical isolation, while the non-active area receives the second set for encapsulation, ensuring each area has the appropriate properties without compromising the other.
Data Source
AI summary
Provided is a display device. The display device comprises a substrate including an active area in which a plurality of sub pixels is disposed and a non-active area. The display device comprises a plurality of transistors disposed in each of the plurality of sub pixels on the substrate. The display device comprises a plurality of light emitting diodes disposed in each of the plurality of sub pixels on the substrate. The display device comprises a plurality of first alignment keys disposed on the substrate. The display device comprises an insulating layer which includes a plurality of inorganic insulating layers and a plurality of organic insulating layers disposed on the substrate. In an area which overlaps the plurality of first alignment keys, the plurality of organic insulating layers is disposed on the plurality of inorganic insulating layers.