Interpixel Electrode Structure for OLED Crosstalk Suppression
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Solution Overview
Problem
High pixel density in displaying apparatuses leads to electric interference (crosstalk) between adjacent pixels, resulting in image quality deterioration.
Innovation Solution
A displaying apparatus with a pixel structure that includes lower electrodes, an organic compound layer, an upper electrode, and an interpixel electrode arranged along pixel boundaries, with insulating layers to electrically isolate the electrodes and reduce crosstalk, using a simple and effective manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel density is increased, then display resolution is improved, but electric interference between adjacent pixels occurs causing image quality deterioration
Solution Approach 1:
The invention divides the electrode structure into multiple segments: lower electrodes for each pixel, interpixel electrodes positioned between pixels, and upper electrodes. This segmentation creates electrical isolation between adjacent pixels through the insulating layer, preventing crosstalk while maintaining high pixel density for high-resolution displays
Solution Approach 2:
An insulating layer is introduced as an intermediary between the lower electrodes and the interpixel/upper electrodes. This intermediate layer electrically isolates adjacent pixels, blocking harmful electric field interference while allowing the multi-electrode structure to maintain high pixel density for improved display resolution
2Measurement precision
If pixel density is increased, then display resolution is improved, but light leakage from adjacent pixels occurs causing image quality deterioration
Solution Approach 1:
The light leakage prevention structure is segmented into multiple layers: the insulating layer covering lower electrodes, the organic compound layer, and the interpixel electrode positioned between pixels. This segmentation creates optical isolation barriers that prevent light from one pixel from leaking into adjacent pixels, enabling high pixel density without compromising image quality
Solution Approach 2:
The invention addresses light leakage by adding vertical layering (another dimension) rather than simply increasing horizontal pixel density. The multi-layer structure including insulating layers and interpixel electrodes creates optical barriers in the vertical dimension, preventing lateral light spread while maintaining high pixel density for improved resolution
3Reliability
If insulating layer thickness is increased, then electrical isolation between pixels is improved, but manufacturing complexity increases
Solution Approach 1:
The insulating layer serves multiple functions simultaneously: it provides electrical isolation between pixels, acts as a structural support layer, and contributes to optical isolation. This multi-functionality allows adequate electrical isolation without requiring excessive thickness, simplifying manufacturing while maintaining reliability
Solution Approach 2:
The invention optimizes the thickness parameter of the insulating layer to achieve the minimum required electrical isolation performance. By carefully selecting the thickness parameter rather than using excessive thickness, the design achieves reliable electrical isolation between pixels while keeping the manufacturing process simple and cost-effective
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 electric interference and light leakage between pixels, enabling both high pixel density and high image quality by generating a predetermined electric field and optimizing the refractive indices of insulating layers.
Implementation Method 1
a first insulating layer configured to cover an upper surface of the substrate and at least side surfaces of the plurality of lower electrodes to electrically isolate the plurality of lower electrodes from each other
Implementation Method 2
an interpixel electrode provided between the plurality of lower electrodes to be arranged along a boundary of the plurality of pixels under the organic compound layer and above the first insulating layer
Implementation Method 3
a plurality of pixels each including an organic light emitting element
Data Source
AI summary
A displaying apparatus in which a plurality of pixels each including an organic light emitting element are arrayed in a pixel region, comprising a plurality of lower electrodes arrayed on a substrate in correspondence with the plurality of pixels, a first insulating layer covering an upper surface of the substrate and at least side surfaces of the plurality of lower electrodes, an organic compound layer provided all over the pixel region to cover the plurality of lower electrodes and the first insulating layer, an upper electrode provided all over the pixel region to cover the organic compound layer, and an interpixel electrode provided between the plurality of lower electrodes to be arranged along a boundary of the plurality of pixels under the organic compound layer and above the first insulating layer.