Display Resonator Structure With Region-Specific Resonance Orders
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Solution Overview
Problem
Display apparatuses with resonator structures suffer from the issue of extracting unwanted colors of light in the peripheral regions of subpixels, leading to reduced color purity.
Innovation Solution
A display apparatus design featuring a resonator structure with distinct resonance orders in different regions of the subpixels, utilizing a configuration where the optical path lengths and reflector thicknesses are set to resonate specific colors, thereby enhancing color purity by emphasizing the desired color emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a resonator structure is used to improve light extraction efficiency, then light extraction efficiency is improved, but color purity deteriorates due to extraction of unwanted colors in peripheral portions
Solution Approach 1:
The patent applies local quality by making the reflector thickness vary across different regions of the subpixel. Specifically, the reflector has a first thickness in a first region and a second thickness in a second region, with the thickness ratio being a specific value. This spatial variation in reflector thickness creates different resonance conditions in different regions, allowing the center to emit the desired color while the periphery suppresses unwanted colors, thus resolving the contradiction between light extraction efficiency and color purity.
2Ease of manufacture
If uniform reflector thickness is used to simplify manufacturing, then ease of manufacture is improved, but color purity deteriorates due to inability to suppress unwanted colors in peripheral regions
Solution Approach 1:
The patent implements local quality through a reflector with spatially varying thickness. The reflector comprises a first portion with a first thickness and a second portion with a second thickness, where the thickness ratio falls within a specific range. This design allows different regions to have optimized resonance characteristics - the first region for desired color emission and the second region for suppressing unwanted colors - thereby achieving high color purity while maintaining reasonable manufacturability through a systematic thickness variation approach.
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 suppresses the extraction of unwanted colors, resulting in improved color purity and enhanced light emission efficiency.
Implementation Method 1
the reflector, the interlayer film, the first electrodes, the electroluminescence layer, and the second electrode constitute a resonator structure that resonates emitted light from the electroluminescence layer
Data Source
AI summary
Provided are a display apparatus and an electronic device having excellent color purity. A display apparatus includes a plurality of first electrodes disposed two-dimensionally, a second electrode disposed on a side of a first surface of each of the first electrodes, an electroluminescence layer disposed between the first electrodes and the second electrode, a reflector facing a second surface of each of the first electrodes, an interlayer film covering the reflector, and an insulating layer provided between adjacent first electrodes of the plurality of first electrodes and having a plurality of openings, in which each of the openings is provided on the first surface of each of the first electrodes, and the reflector, the interlayer film, the first electrodes, the electroluminescence layer, and the second electrode constitute a resonator structure that resonates emitted light from the electroluminescence layer, and in a case where a region corresponding to each of the openings is a first region and a region corresponding to an outer side of the first region in a region corresponding to each of the first electrodes is a second region in a plan view, a resonance order of a portion corresponding to the first region and a resonance order of a portion corresponding to the second region are different in the resonator structure.