Reflective Electrode Optical Path Matching for Display Brightness
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Solution Overview
Problem
Display devices with reflective electrodes face efficiency degradation due to brightness and color coordinate differences between light emitted from inclined and flat regions, leading to image quality deterioration.
Innovation Solution
A display device design featuring a reflective electrode with a first and second region, where the optical path between the second region and the upper electrode is the same as between the first region and the upper electrode, utilizing a bank insulating layer with a different refractive index and thickness to ensure consistent brightness and color coordinates across both regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a reflective electrode with an inclined region is used to improve light-extraction efficiency, then light extraction efficiency is improved, but brightness and color coordinates of the emitted light differ from the flat region, causing image quality degradation
Solution Approach 1:
The patent applies local quality by creating different regions on the reflective electrode surface (flat region and inclined region) with distinct functions. The flat region maintains standard optical properties for normal light extraction, while the inclined region is specifically designed to extract confined light at different angles. This localized functional differentiation allows the system to improve overall light extraction efficiency while maintaining image quality through controlled local variations rather than uniform modification across the entire electrode surface.
Solution Approach 2:
The patent employs parameter changes by modifying the inclination angle of the inclined region on the reflective electrode. By adjusting this geometric parameter, the device optimizes the extraction of light that would otherwise be confined by total internal reflection. The specific inclination angle is chosen to maximize light extraction efficiency while maintaining compatibility with the overall display device geometry and optical requirements, thus resolving the contradiction between improved light extraction and maintained image quality.
2Use of energy by moving object
If the inclined region extracts more light, then light-extraction efficiency is improved, but the brightness and color of the image are degraded
Solution Approach 1:
The patent applies segmentation by dividing the reflective electrode into distinct functional regions: a flat region and an inclined region. This segmentation allows different portions of the electrode to perform specialized functions - the flat region for standard light reflection and the inclined region for extracting confined light. By separating these functions into distinct segments rather than using a uniform structure, the system can improve overall light extraction efficiency while maintaining brightness uniformity through the coordinated operation of specialized regions.
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
Improves light-extraction efficiency without degrading image quality by maintaining consistent brightness and color coordinates across the inclined and flat regions of the reflective electrode.
Implementation Method 1
the reflective electrode may include a flat region and an inclined region. The light-emitting element may be disposed on the flat region of the reflective electrode. Thus, in the display device, the light confined by the total reflection may be emitted to the outside by the inclined region of the reflective electrode.
Implementation Method 2
the light confined by the total reflection may be emitted to the outside by the inclined region of the reflective electrode
Implementation Method 3
utilizing a bank insulating layer with a different refractive index and thickness to ensure consistent brightness and color coordinates across both regions
Data Source
AI summary
A display device includes a reflective electrode including a first region and a second region inclined relative to the first region, a lower electrode on the first region of the reflective electrode, a bank insulating layer covering an edge of the lower electrode, the bank insulating layer extending onto the second region of the reflective electrode, an upper electrode on a portion of the lower electrode exposed by the bank insulating layer, the upper electrode extending onto the bank insulating layer, and a light-emitting layer between the lower electrode and the upper electrode. The light-emitting layer extends between the bank insulating layer and the upper electrode. An optical path between the second region of the reflective electrode and the upper electrode is the same as an optical path between the first region of the reflective electrode and the upper electrode.