OLED Display Panel Transparent Conductive Particles Brightness Uniformity
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Solution Overview
Problem
Large-sized OLED display devices face issues with uneven brightness due to higher resistance in the central region of the cathode, leading to lower brightness at the center compared to the edges, restricting the development of these devices.
Innovation Solution
Incorporating a display panel design with an electrode layer and an auxiliary electrode layer electrically connected by transparent conductive particles, which reduces planar resistance and ensures uniform brightness across the panel, while also improving light reflection and extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional electrode layer is used in large-sized OLED display devices, then the device structure is simple, but the resistance in the central region is high causing uneven brightness
Solution Approach 1:
The single electrode layer is segmented into two separate electrode layers (first electrode layer and second electrode layer) positioned at different locations. This segmentation allows the display device to achieve uniform brightness by distributing the electrical connection paths, thereby reducing the resistance issue in the central region while maintaining structural simplicity.
2Area of stationary object
If the electrode layer is made larger to cover the entire panel, then the coverage area is improved, but the planar resistance increases causing IR drop
Solution Approach 1:
Instead of expanding the electrode layer in a single plane which increases resistance, the solution introduces a vertical dimension by positioning the first and second electrode layers at different heights. This dimensional change creates multiple electrical connection paths through transparent conductive particles, reducing planar resistance while maintaining full panel coverage.
3Reliability
If transparent conductive particles are added to reduce resistance, then brightness uniformity is improved, but the device structure becomes more complex
Solution Approach 1:
Transparent conductive particles serve as intermediary elements between the first and second electrode layers. These particles establish electrical connection paths without requiring direct contact between large electrode surfaces, thereby reducing resistance and improving brightness uniformity while adding minimal structural complexity.
4Reliability
If the distance between electrode layers is reduced to lower resistance, then electrical conductivity is improved, but light extraction efficiency may be affected
Solution Approach 1:
The distance between the first and second electrode layers is optimized locally rather than uniformly across the entire panel. By positioning electrodes at different locations and using transparent conductive particles as connection points, the design achieves low resistance where needed while maintaining sufficient spacing in light extraction regions to preserve optical performance.
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 achieves uniform brightness across the display panel by reducing IR drop in the central region and enhances light extraction and reflection, improving the overall visual effect and performance of OLED displays.
Implementation Method 1
a plurality of transparent conductive particles between the electrode layer and the auxiliary electrode layer, wherein the plurality of transparent conductive particles are configured such that the electrode layer and the auxiliary electrode layer are electrically connected with each other
Implementation Method 2
the transparent spherical resin core has a refractive index greater than a refractive index of the filler
Data Source
AI summary
A display panel, a method of manufacturing the display panel, and a display device are provided. The display panel includes: an electrode layer; an auxiliary electrode layer opposite to the electrode layer; and a plurality of transparent conductive particles between the electrode layer and the auxiliary electrode layer, wherein the plurality of transparent conductive particles are configured such that the electrode layer and the auxiliary electrode layer are electrically connected with each other.