OLEDoS Display Panel Wiring Structure for Crosstalk Isolation
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Solution Overview
Problem
Wearable devices such as HMDs and AR glasses using OLEDoS technology experience unintended leakage current and color crosstalk between neighboring sub-pixels due to the proximity of sub-pixels, leading to reduced light efficiency and user discomfort.
Innovation Solution
A display panel design featuring a reflective metal with a positive tapered shape surrounding the side surfaces of first wirings, disconnecting the light-emitting stack between neighboring sub-pixels, and utilizing a reflective metal with high reflectance to enhance light efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance between neighboring sub-pixels is decreased to increase resolution, then the display resolution is improved, but leakage current and color crosstalk occur between sub-pixels
Solution Approach 1:
The patent divides the light-emitting stack into separate regions by introducing a partition wall structure between neighboring sub-pixels. This segmentation prevents the light-emitting layers of adjacent sub-pixels from contacting each other, thereby eliminating leakage current paths while maintaining high resolution through close sub-pixel spacing.
Solution Approach 2:
The patent introduces a partition wall as an intermediary structure between neighboring sub-pixels. This partition wall acts as a barrier that prevents direct contact between light-emitting stacks of adjacent sub-pixels, blocking leakage current flow while allowing the sub-pixels to remain in close proximity for high resolution display.
2Measurement precision
If the sub-pixels are positioned close together to achieve high PPI, then the display quality is improved, but unintended current flow occurs through conductive layers
Solution Approach 1:
The light-emitting stack is segmented into discrete units separated by partition walls. This segmentation ensures that conductive layers of neighboring sub-pixels do not form continuous paths, preventing leakage current while enabling high PPI through close sub-pixel arrangement.
Solution Approach 2:
The harmful conductive path between sub-pixels is extracted by removing or blocking the continuous conductive layer connection. The partition wall structure extracts the problematic current flow path while preserving the necessary conductive connections within each individual sub-pixel for proper operation.
3Object-generated harmful factors
If a reflective metal structure is added to block leakage current, then color crosstalk is reduced, but device complexity increases
Solution Approach 1:
The partition wall structure serves multiple functions simultaneously: it acts as a physical barrier to prevent light leakage, provides structural support for the light-emitting stack, and serves as an integration point for the reflective metal layer. This multi-functionality reduces overall device complexity by combining multiple protective and structural roles into a single integrated component.
Solution Approach 2:
The reflective metal layer is merged with the partition wall structure, combining the light-blocking function of the partition wall with the light-reflecting function of the metal layer. This integration reduces the number of separate components needed and simplifies the overall device structure while effectively preventing color crosstalk.
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 reduces leakage current and color crosstalk, enhancing light efficiency and user comfort by preventing unintended current flow between sub-pixels.
Implementation Method 1
a reflective metal covering a side surface of the first wiring and having a reflectance
Data Source
AI summary
A display panel, a display device, and a mobile electronic device including the display device are provided. A display device includes a display panel including a substrate, and a display element layer above the substrate, wherein the display element layer includes a pixel-defining film for partitioning sub-pixels, a first electrode of each sub-pixel at an opening defined by the pixel-defining film, in plan view, a first wiring above the pixel-defining film between neighboring sub-pixels, a reflective metal covering a side surface of the first wiring and having a reflectance, a light-emitting stack above the pixel-defining film including the first electrode and the first wiring and disconnected around the first wiring, and a second electrode above the light-emitting stack.