OLED Light Compensation Pattern for Color Shift Reduction
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Solution Overview
Problem
Organic light emitting display apparatuses face a color shift phenomenon due to changes in the viewing angle, leading to reduced light emission efficiency as colors appear shifted, and existing technologies do not effectively address this issue.
Innovation Solution
The organic light emitting display apparatus incorporates a light compensation pattern with progressively decreasing widths of protrusion patterns and grooves on the second electrode, which refracts incident light to reduce color shift and enhance light emission efficiency by diffusing light over a wide angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional flat encapsulation structure is used, then the device structure is simple, but color shift occurs due to changes in viewing angle
Solution Approach 1:
The encapsulation layer is divided into multiple protrusion patterns with different widths, creating segmented regions that refract light at different angles. This segmentation allows the structure to compensate for viewing angle changes while maintaining manufacturability through standard photolithography processes.
Solution Approach 2:
Different regions of the encapsulation layer are given different local properties through varying protrusion widths. The protrusion patterns have progressively decreasing widths from the center outward, creating local optical properties that compensate for viewing angle-dependent color shifts.
2Adaptability or versatility
If the viewing angle changes, then light can be emitted in different directions, but color shift phenomenon occurs reducing light emission efficiency
Solution Approach 1:
The encapsulation layer with varying protrusion widths dynamically adapts to different viewing angles by refracting light differently depending on the incident angle. This dynamic optical response maintains color accuracy across a wide viewing range without requiring active control mechanisms.
Solution Approach 2:
The optical parameters of the encapsulation layer are changed by varying the physical dimensions (widths) of protrusion patterns. This parameter variation enables the structure to maintain consistent color appearance across different viewing angles by compensating for angle-dependent optical path differences.
3Manufacturing precision
If protrusion patterns with varying widths are added to the encapsulation layer, then color shift is reduced and light emission efficiency is improved, but device complexity increases
Solution Approach 1:
The light compensation function is merged with the encapsulation layer, combining protective and optical compensation functions into a single integrated structure. This eliminates the need for separate compensation layers while achieving color accuracy across viewing angles.
Solution Approach 2:
The encapsulation layer is designed to serve multiple functions simultaneously: protecting the organic light emitting layer from environmental degradation and compensating for viewing angle-dependent color shifts. The protrusion patterns enable the same structure to fulfill both protective and optical compensation roles.
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 light compensation pattern effectively reduces color shift and improves light emission efficiency by refracting light at varying angles, ensuring high light extraction and maintaining color accuracy across different viewing angles.
Implementation Method 1
The light compensation pattern includes a plurality of protrusion patterns having progressively decreasing widths as a distance from a center of the pixel region increases... which refracts incident light to reduce color shift and enhance light emission efficiency
Implementation Method 2
The polarizing plate may be disposed on the encapsulation layer and circularly polarize incident light
Data Source
AI summary
An organic light emitting display apparatus includes a substrate including a pixel region, a first electrode on the substrate, a second electrode on the first electrode, an organic light emission layer between the first and second electrodes to emit light, a plurality of layers on the second electrode, and a light compensation pattern on the second electrode and overlapping the pixel region, the light compensation pattern including a plurality of protrusion patterns having progressively decreasing widths as a distance from a center of the pixel region increases, and a plurality of grooves separating the protrusions in a direction parallel to the substrate from the center of the pixel region.