Color Bank Structure for Pixel Optical Isolation in LED Displays
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Solution Overview
Problem
Existing display devices using subminiature light emitting elements face challenges in preventing optical interference between adjacent light emitting devices or pixels, and in forming a bank structure that effectively encloses emission areas without residue formation.
Innovation Solution
A display device is designed with a bank configured to enclose each emission area, where the bank is formed of a color bank including a color filter material that blocks blue light emitted from the light emitting elements. The bank is easily formed in a desired shape and prevents optical interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a bank structure is formed to enclose emission areas, then optical interference between adjacent pixels is prevented, but residue formation occurs during bank formation
Solution Approach 1:
The patent applies color filter material to the bank structure, where the filter material's color properties are selected to match the emitted light color. This allows the bank to simultaneously provide optical isolation (blocking harmful light leakage) and prevent residue formation through photoresist removal, as the color filter material enables effective residue removal processes.
Solution Approach 2:
The bank is constructed as a composite structure combining color filter material with bank formation materials. This composite approach allows the bank to fulfill multiple functions: structural enclosure, optical filtering, and compatibility with residue removal processes, thereby preventing both optical interference and residue formation.
2Volume of moving object
If subminiature light emitting elements are used, then device size is reduced, but optical interference between adjacent elements increases
Solution Approach 1:
The patent applies local quality by implementing color filter material specifically at the bank regions surrounding each light emitting element. This localized filtering approach provides targeted optical isolation where it is most needed (at the boundaries between elements) while maintaining the miniaturized device structure.
Solution Approach 2:
The bank with color filter material acts as an intermediary structure between adjacent light emitting elements. This intermediary provides optical isolation by filtering leaked light, preventing optical interference between the closely spaced miniaturized elements while allowing the elements to remain small.
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
The solution effectively prevents optical interference and allows for easy formation of the bank structure, enhancing the display device's performance and image quality.
Implementation Method 1
the bank is formed of a color bank including a color filter material for blocking light emitted from the first, the second, and the third light emitting elements
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A
AI summary
A display device in accordance with an embodiment may include: a first substrate including first, second, and third sub-pixel areas; a first sub-pixel including a first light emitting element disposed in the first sub-pixel area; a second sub-pixel including a second light emitting element disposed in the second sub-pixel area; a third sub-pixel including a third light emitting element disposed in the third sub-pixel area; and a bank disposed between the first, the second, and the third sub-pixels and configured to enclose an emission area of each of the first, the second, and the third sub-pixels. The bank may be formed of a color bank including a color filter material for blocking light of colors emitted from the first, the second, and the third light emitting elements.