Display Device Color Conversion Pattern Optimization
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Solution Overview
Problem
Existing organic light-emitting display devices face limitations in color conversion efficiency and luminance, with challenges in preventing color mixing defects between adjacent pixels, which affect display quality.
Innovation Solution
A display device structure featuring a base substrate with an organic layer having an uneven pattern region and a non-pattern region, a light-emitting element, and a color conversion pattern that overlaps both regions, along with a pixel defining layer to prevent color mixing, enhancing color conversion efficiency and luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the thickness of the color conversion pattern is increased to enhance color conversion efficiency, then color reproducibility improves, but the device structure becomes more complex and manufacturing difficulty increases
Solution Approach 1:
The organic layer is divided into a pattern region and a non-pattern region, creating distinct functional zones. The color conversion pattern is positioned to overlap specifically with the pattern region, segmenting the light conversion function from the emission function. This segmentation allows optimized color conversion without requiring increased overall thickness throughout the entire device structure.
Solution Approach 2:
The uneven pattern is localized to the pattern region, creating local optical path differences only where needed for color conversion enhancement. The non-pattern region maintains a substantially flat surface, preserving simple manufacturing in areas where color conversion is not required. This local quality approach enhances color conversion efficiency in specific zones without complicating the entire device structure.
2Manufacturing precision
If the color conversion pattern is optimized for efficiency, then luminance and color reproducibility improve, but color mixing defects between adjacent pixels may occur
Solution Approach 1:
The organic layer is segmented into pattern and non-pattern regions that work together to control light paths. The pixel defining layer is positioned to define openings that correspond to light-emitting regions while maintaining separation between adjacent pixels. This segmentation prevents color mixing by ensuring that color conversion patterns in one pixel do not interfere with light from adjacent pixels, even when the color conversion pattern is optimized for high efficiency.
Solution Approach 2:
The pixel defining layer acts as an intermediary structure between the organic layer and the color conversion pattern. It defines the boundaries of light-emitting regions and prevents direct optical interference between adjacent pixels. This intermediary layer enables the use of optimized color conversion patterns while maintaining color purity by blocking stray light that would cause color mixing defects.
3Manufacturing precision
If an uneven pattern is formed in the organic layer to improve color conversion, then manufacturing precision improves, but the manufacturing process becomes more complex
Solution Approach 1:
The uneven pattern is formed in the organic layer during the organic layer formation process itself, before subsequent layers are deposited. This preliminary action integrates the pattern formation into an existing manufacturing step rather than requiring a separate, complex patterning process. The organic layer material is applied and patterned in advance, establishing the optical path differences needed for color conversion enhancement without adding significant manufacturing complexity.
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 proposed structure improves color reproducibility and luminance by optimizing color conversion efficiency and preventing color mixing defects, leading to enhanced display quality.
Implementation Method 1
The color conversion pattern converts the color of the incident light and may emit light of a color different from the incident light
Implementation Method 2
Electrons and holes provided from the two electrodes are recombined in the light-emitting layer to generate excitons, the generated excitons change from an excited state to a ground state, and light may be emitted
Data Source
AI summary
A display device includes a base substrate, an organic layer on the base substrate and including a pattern region having an uneven pattern formed thereon, and a non-pattern region having a substantially flat surface, a light-emitting element on the organic layer, and a color conversion pattern on the light-emitting element and overlapping the pattern region and the non-pattern region.