Repairable Sub Pixel Structure for LED Transfer Defects
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Solution Overview
Problem
Display devices with light-emitting diodes (LEDs) face challenges in repairing transfer defects of light-emitting elements, which can result in defective sub pixels, affecting the overall display quality and reliability.
Innovation Solution
The implementation of a display device structure that includes a substrate with a bonding layer, multiple light-emitting elements, and an additional light-emitting element on a planarization layer, along with connection electrodes and bonding electrodes, allows for the repair of defective sub pixels by transferring an additional light-emitting element onto the defective pixels, ensuring stable connection and improved luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If light-emitting elements are transferred to sub pixels, then display device is assembled, but transfer defects occur causing defective sub pixels
Solution Approach 1:
The patent prepares additional light-emitting elements in advance as backup components. These additional elements are fabricated and positioned ready for potential transfer to defective sub pixels before the display device completes its operation, enabling pre-planned repair actions that maintain reliability without disrupting assembly productivity.
Solution Approach 2:
The patent recovers defective sub pixels by transferring additional light-emitting elements to replace failed ones. Instead of discarding the entire display device due to transfer defects, the system recovers functionality by substituting defective components with backup elements, thereby maintaining reliability while preserving the assembled device.
2Reliability
If additional light-emitting element is added to repair defective sub pixel, then reliability is improved, but device complexity increases
Solution Approach 1:
The additional light-emitting element is designed with universal compatibility to replace any defective light-emitting element in the display device. This multi-functional backup component can serve multiple sub pixels across different color types (red, green, blue), reducing the need for separate backup elements for each sub pixel and thereby limiting the increase in device complexity.
Solution Approach 2:
The patent creates a copy of the light-emitting element structure as an additional backup element. This copied element replicates the essential functional characteristics of the original light-emitting elements, enabling replacement without requiring complex custom-designed repair components, thus maintaining relatively simple device architecture while improving reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively repairs defective sub pixels, enhances the reliability of the display device by ensuring proper electrical connection and luminous efficiency, and minimizes defects caused by transfer errors, thereby improving the overall display quality.
Implementation Method 1
display devices having light-emitting diodes (LED) have garnered interest and attention as a next-generation display device
Implementation Method 2
a light-emitting layer between the first semiconductor layer and the second semiconductor layer
Data Source
AI summary
According to an aspect of the present disclosure, a display device includes a substrate on which a pixel including a plurality of sub pixels is disposed; a bonding layer on the substrate; a plurality of light-emitting elements in a first subset of the plurality of sub pixels and disposed on the bonding layer; a planarization layer on the bonding layer and the plurality of light-emitting elements; and an additional light-emitting element in a second subset of the plurality of sub pixels and disposed on the planarization layer.