Sub-Pixel Electrode Layout for Higher-Luminance Wearable Displays
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Solution Overview
Problem
There is a growing demand for display devices with improved display quality, particularly in wearable electronic devices, but existing technologies have limitations in achieving high luminance and efficient light emission.
Innovation Solution
The display device incorporates a specific sub-pixel structure with a reflective electrode, a first electrode, a pixel defining layer, and a light emitting member, where the first electrode of the second sub-pixel is disposed between the reflective electrode and the pixel defining layer, and the first electrode of the first sub-pixel is connected through a contact hole, utilizing materials like titanium nitride and indium tin oxide for enhanced light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the first electrode is disposed on the pixel defining layer for all sub-pixels, then the manufacturing process is simplified, but the light emission efficiency and luminance are reduced
Solution Approach 1:
The patent applies local quality by differentiating the electrode configuration between sub-pixel types. First sub-pixels have the first electrode disposed on the pixel defining layer, while second sub-pixels have the first electrode disposed between the reflective electrode and pixel defining layer. This localized structural variation optimizes light emission for each sub-pixel type while maintaining overall manufacturing feasibility through standardized fabrication processes.
2Illumination intensity
If the distance between reflective electrode and first electrode is increased, then light emission efficiency is improved, but the device thickness increases
Solution Approach 1:
The patent optimizes the distance parameter between the reflective electrode and first electrode to approximately one-quarter of the wavelength of emitted light (e.g., about 1700 Å for red sub-pixels). This parameter optimization achieves constructive interference of reflected light, maximizing light emission efficiency while maintaining a compact device thickness suitable for wearable applications.
3Illumination intensity
If different electrode configurations are used for different sub-pixels, then light emission is optimized, but the manufacturing complexity increases
Solution Approach 1:
The patent segments the pixel array into different sub-pixel types (first sub-pixels and second sub-pixels) with distinct electrode configurations. This segmentation allows optimization of light emission for each sub-pixel type while enabling systematic manufacturing through dedicated fabrication steps for each sub-pixel category, balancing performance optimization with manufacturing feasibility.
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
This configuration enhances light emission efficiency and luminance, particularly in wearable electronic devices, by optimizing the distance and alignment of electrodes and using specific materials, resulting in improved display quality.
Implementation Method 1
a reflective electrode disposed on a base layer
Implementation Method 2
A distance between the reflective electrode and the first electrode in the first sub-pixel may be about 1⁄4 of a wavelength band of light which the first sub-pixel emits to an outside
Data Source
AI summary
Provided is a display device including a first sub-pixel, a second sub-pixel, and a third sub-pixel. Each of the first sub-pixel, the second sub-pixel, and the third sub-pixel includes: a reflective electrode disposed on a base layer; a first electrode disposed on the reflective electrode; a pixel defining layer disposed on the reflective electrode; a light emitting member disposed on the first electrode and the pixel defining layer; and a second electrode disposed on the light emitting member. The first electrode of the first sub-pixel is disposed on the pixel defining layer, and the first electrode of the second sub-pixel is disposed between the reflective electrode and the pixel defining layer.