Auxiliary Electrode Partition Wall for Transparent Display Luminance
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Solution Overview
Problem
Transparent display devices face issues with luminance non-uniformity due to high sheet resistance in transparent electrodes, leading to deteriorated display quality, especially in large-area panels.
Innovation Solution
Incorporating an auxiliary electrode region with a partition wall structure that increases electrode contact area and reduces electrical resistance, while also acting as a spacer to eliminate the need for a separate spacer process, thereby improving transmittance and uniformity of luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the thickness of the transparent electrode is reduced to improve light transmittance, then light transmittance is improved, but electrical resistance of the transparent electrode is further increased
Solution Approach 1:
The patent divides the transparent electrode system into multiple components: the original transparent electrode and additional auxiliary transparent electrodes. These segmented electrode elements work together to provide both the required light transmittance (achieved by maintaining thin individual layers) and reduced electrical resistance (achieved by increasing total conductive area through multiple elements).
Solution Approach 2:
The patent extends the electrode structure from a single-layer two-dimensional configuration to a multi-layer three-dimensional arrangement. By stacking multiple transparent electrode layers at different positions, the system increases the effective conductive cross-section without compromising light transmittance, as each layer remains thin but their combined electrical conductance is enhanced.
2Illumination intensity
If a transparent electrode with high sheet resistance is used to improve transparency, then transparency is improved, but luminance non-uniformity occurs due to large differences in VSS voltage rise values
Solution Approach 1:
The patent segments the electrode system into multiple transparent electrode layers, each contributing to the overall electrical conductance. This segmentation allows the use of thin, highly transparent individual layers while their combined effect provides sufficient current distribution to maintain luminance uniformity across the display panel.
Solution Approach 2:
The patent creates a composite electrode structure by combining multiple transparent electrode layers. This composite configuration achieves a balance between optical properties (high transparency from thin individual layers) and electrical properties (sufficient conductance for uniform current distribution), effectively resolving the contradiction between transparency and luminance uniformity.
3Reliability
If the electrode contact area is increased to reduce resistance, then electrical resistance is reduced, but device complexity increases due to additional processes
Solution Approach 1:
The patent merges the function of spacers with the partition wall structure. The partition walls serve dual purposes: they define the boundaries of the light-emitting regions and simultaneously act as spacers to maintain the required distance between electrode layers. This integration eliminates the need for separate spacer components and their associated manufacturing processes, reducing device complexity while maintaining effective electrode contact area.
Solution Approach 2:
The partition wall structure is designed to perform multiple functions: it serves as a boundary definition for light-emitting regions, acts as a spacer to maintain layer separation, and provides structural support for the electrode assembly. This multi-functionality reduces the overall component count and simplifies the manufacturing process while achieving the goal of increased electrode contact area for reduced resistance.
Data Source
AI summary
A transparent display panel has an auxiliary electrode region including a partition wall whose a width of a top face is larger than that of a bottom face thereof. The auxiliary electrode region is disposed on a line region within a display region. A second electrode of an organic light-emitting element and a VSS voltage connection line is electrically connected to each other via an auxiliary electrode, such that electrical resistance of the second electrode as a transparent electrode is reduced. Further, the auxiliary electrode region is formed on each of a plurality of line regions respectively including VSS voltage connection lines extending across the display region. Thus, a current is fed to each pixel in the display region in a smooth manner, such that luminance distribution across the panel is uniform.