Microcavity OLED Pixel Structure for High-Resolution Color Reproduction
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Solution Overview
Problem
Display devices for VR, AR, or MR applications face challenges with low resolution and color reproducibility, which affect the sense of reality and immersion.
Innovation Solution
A display device design incorporating first and second light-emitting elements with specific layer structures, including conductive layers of varying thickness and optical properties, and a shared upper electrode to enhance resolution and color reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional organic EL element structure is used, then the device can be thin and lightweight, but the resolution is insufficient for VR/AR/MR applications
Solution Approach 1:
The patent divides the display into multiple sub-pixels (red, green, blue) with dedicated light-emitting elements, and further segments each element into multiple layers with different functions (lower electrode, reflective layer, insulating layer, conductive layer, light-emitting layer, upper electrode). This segmentation enables higher resolution by allowing precise control of each sub-pixel's light emission characteristics.
Solution Approach 2:
The patent introduces a microcavity structure by adding the reflective layer and insulating layer between the lower and upper electrodes, creating an optical resonance cavity. This dimensional addition to the layer structure enables precise control of light emission wavelength and intensity, achieving high resolution and color reproducibility without increasing pixel density excessively.
2Manufacturing precision
If the display panel resolution is increased, then the sense of reality and immersion improves, but the color reproducibility may deteriorate
Solution Approach 1:
The patent assigns different thicknesses to the insulating layer and conductive layer in different regions of the light-emitting element. Specifically, the insulating layer has a first thickness in contact with the reflective layer and a second thickness (greater than the first) in contact with the conductive layer. The conductive layer also has varying thickness. This local variation in layer thickness enables precise control of the optical path length in different regions, achieving both high resolution and accurate color reproduction by optimizing light emission characteristics for each sub-pixel.
3Reliability
If the conductive layer thickness is increased to improve electrical connection, then the light-transmitting property deteriorates
Solution Approach 1:
The conductive layer is designed with non-uniform thickness: it is thicker in regions where electrical connection is critical (near the lower electrode and contact areas) and thinner in regions where light transmission is prioritized (central emission areas). This local variation in thickness allows the conductive layer to simultaneously provide reliable electrical connection and maintain high light transmission, resolving the contradiction between these two requirements.
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 enables a display device with extremely high resolution and high color reproducibility, providing a high-luminance and reliable display experience.
Implementation Method 1
By applying a voltage to this element, light emission can be obtained from the light-emitting organic compound
Implementation Method 2
The upper electrode has a transmitting property and a reflective property with respect to visible light
Data Source
AI summary
A display device with high resolution is provided. The display device includes a plurality of light-emitting elements that emit light of different colors. The light-emitting element has a microcavity structure and intensifies light with a specific wavelength. The light-emitting elements that emit light of different colors each include a reflective layer and a conductive layer with a varied thickness over a lower electrode, and the lower electrode and the conductive layer are electrically connected to each other in the light-emitting element. The light-emitting elements with different colors being intensified by different optical path lengths are formed.