OLED Pixel Electrode Inclined Surface Brightness
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Solution Overview
Problem
As pixel sizes decrease in organic light-emitting display apparatuses, the emission area is reduced, leading to decreased brightness and visibility.
Innovation Solution
The design includes a substrate with an insulating layer having inclined surfaces, a reflective pixel electrode covering part of the surface, and a reflective opposite electrode, with a pixel-defining layer to control light emission, increasing the emission area and brightness by reflecting light through inclined surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel size is reduced to achieve high resolution, then resolution is improved, but emission area is reduced and brightness decreases
Solution Approach 1:
The patent introduces an inclined insulating layer that creates a three-dimensional structure with an inclined surface. This dimensional change allows the emission layer to extend further laterally, increasing the effective emission area without increasing the planar pixel footprint. The inclined surface enables light to be emitted from multiple heights and angles, effectively adding a vertical dimension to the emission process.
Solution Approach 2:
The inclined insulating layer creates a curved or sloped surface geometry rather than a flat plane. This curvature allows for broader light emission angles and increased light extraction efficiency. The inclined surface redirects light paths, enabling more light to escape from the pixel area, thereby increasing brightness without requiring larger pixel dimensions.
2Measurement precision
If pixel size is reduced to achieve high resolution, then resolution is improved, but emission area is reduced
Solution Approach 1:
By introducing the inclined insulating layer, the patent transforms the two-dimensional emission plane into a three-dimensional structure. The emission layer is positioned on the inclined surface, allowing it to occupy a larger volume and project further laterally. This dimensional transformation increases the effective emission area within the constrained pixel footprint, enabling high resolution while maintaining sufficient light output area.
Solution Approach 2:
The inclined insulating layer creates a nested structure where the emission layer is positioned within and upon the inclined surface. This nesting arrangement allows the emission layer to utilize the vertical space created by the inclination, effectively packing more emission area into the same horizontal footprint. The structure enables the emission layer to extend laterally while remaining contained within the pixel boundaries.
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 visibility by maintaining sufficient emission area even with smaller pixels, improving the brightness and resolution of the organic light-emitting display apparatus.
Implementation Method 1
a reflective first pixel electrode disposed over the first inclined surface... a reflective opposite electrode disposed over the first intermediate layer
Data Source
AI summary
An organic light-emitting display apparatus that has high-resolution and high-brightness includes a substrate comprising a major surface; an insulating layer disposed over the substrate and comprising a first inclined surface which is inclined with respect to the major surface and faces away from the substrate; a reflective first pixel electrode disposed over the first inclined surface and configured to cover a portion of the first inclined surface; a first intermediate layer disposed over the first pixel electrode and comprises a light emission layer; and a reflective opposite electrode disposed over the first intermediate layer.