Transparent Conductive Lines in Organic Light Emitting Displays
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Solution Overview
Problem
Existing transparent organic light emitting display devices face challenges in achieving high transmittance while preventing image distortion, as conventional designs often result in reduced transmittance and image clarity due to the arrangement of conductive patterns and pixel regions.
Innovation Solution
The design incorporates a substrate with separated transmitting and pixel regions, featuring transparent and opaque conductive lines, a passivation layer, and pixel electrodes, where the conductive lines are arranged to minimize surface area in transmitting regions and prevent light scattering, with a ratio of transmitting region area to total area between 5% and 90% for optimal balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If transparent conductive lines are used to extend across transmitting regions, then transmittance is improved, but image distortion may occur due to light scattering
Solution Approach 1:
The patent applies local quality by making conductive lines transparent specifically in the transmitting regions while maintaining their functionality. The conductive lines have different optical properties in different regions: they are transparent in transmitting regions to allow light passage, and can be opaque or reflective in pixel regions to support light emission. This localized property differentiation resolves the contradiction between maintaining transmittance and preventing image distortion.
Solution Approach 2:
The patent introduces an intermediary approach by using transparent conductive materials that serve dual purposes: conducting electricity while allowing light transmission. The transparent conductive lines act as intermediaries between the electrical circuitry and the optical function, enabling both electrical connectivity and optical transparency in the transmitting regions, thus preventing image distortion while maintaining transmittance.
2Illumination intensity
If conductive lines are arranged to minimize surface area in transmitting regions, then transmittance is improved, but electrical connectivity may be compromised
Solution Approach 1:
The patent applies parameter changes by optimizing the width, spacing, and arrangement parameters of the conductive lines. The conductive lines are designed with specific dimensional parameters that balance electrical conductivity and optical transparency. By carefully controlling the width and spacing parameters, the design achieves sufficient electrical connectivity while minimizing the surface area occupied by conductive lines in transmitting regions, thus maintaining high transmittance.
Solution Approach 2:
The patent employs composite materials by using transparent conductive oxides or other composite conductive materials that provide both electrical conductivity and optical transparency. These composite materials allow the conductive lines to maintain electrical connectivity with minimal surface area in transmitting regions, resolving the contradiction between transmittance and electrical connectivity.
3Illumination intensity
If pixel regions are separated by transmitting regions, then transmittance is improved, but device complexity increases due to additional layer arrangements
Solution Approach 1:
The patent applies segmentation by dividing the display surface into distinct pixel regions and transmitting regions. This segmentation allows different functional requirements to be met in different areas: pixel regions for light emission and transmitting regions for light transmission. The segmentation is achieved through the arrangement of conductive lines, electrodes, and organic emission layers that are confined to pixel regions, while transmitting regions remain free of these components, simplifying the overall structure despite the regional division.
Solution Approach 2:
The patent applies universality by designing layers and components that serve multiple functions. For example, the conductive lines serve both as electrical interconnects and as structural elements that define region boundaries. The opposite electrode serves both as an electrical contact for light-emitting pixels and as a transparent layer that allows light transmission in transmitting regions. This multi-functionality reduces the need for additional dedicated layers, thereby managing device complexity while maintaining high transmittance.
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 transmittance and prevents image distortion by minimizing the impact of conductive patterns on light transmission, allowing for a clearer external view while maintaining pixel integrity and reducing the risk of light scattering.
Implementation Method 1
an organic emission layer between the pixel electrodes and the opposite electrode, the organic emission layer being configured to emit light
Implementation Method 2
an opposite electrode overlapping the plurality of pixel electrodes, the opposite electrode being configured to transmit light and overlap the transmitting regions and the pixel regions
Data Source
AI summary
An organic light emitting display device includes a substrate having transmitting and pixel regions, the pixel regions being separated by the transmitting regions, at least one thin film transistor in each of the pixel regions, a plurality of transparent first conductive lines electrically connected to the thin film transistors and extending across the transmitting regions, a plurality of second conductive lines electrically connected to the thin film transistors and extending across the transmitting regions, a passivation layer, a plurality of pixel electrodes on the passivation layer, the pixel electrodes being separated and positioned to correspond to respective pixel regions, each of the pixel electrodes being electrically connected to and overlapping a corresponding thin film transistor, an opposite electrode overlapping the pixel electrodes in the transmitting and pixel regions, and an organic emission layer between the pixel electrodes and the opposite electrode.