Tiled Display Reflective Electrode Layout for High-Reflectivity Touch
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Solution Overview
Problem
Large-sized display devices face increased defect rates and decreased productivity and reliability due to the number of pixels, and reflective display devices struggle with low reflectivity for user interaction with objects or backgrounds.
Innovation Solution
A display device design that includes a substrate with transistors, organic and inorganic insulating layers, connection electrodes, and reflective electrodes, along with flip chip type micro light emitting diodes, to enhance light reflectivity and reduce organic insulating layer coverage on power supply lines and touch electrodes, thereby increasing light reflection ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a large-sized display device is manufactured with increased number of pixels, then the display area is improved, but the defect rate increases and productivity decreases
Solution Approach 1:
The display device is divided into multiple small-sized display modules that are connected together to form a large-sized display. Each module contains a reduced number of pixels, making them easier to manufacture with higher yield. The modules are arranged in a matrix configuration and connected via connection electrodes, allowing the system to achieve large display area while maintaining manufacturing productivity.
2Ease of operation
If a reflective display device is designed to reflect objects or backgrounds, then user interaction is improved, but the reflectivity is insufficient
Solution Approach 1:
The power supply line is designed with a reflective electrode having a specific reflectivity (e.g., 80% or higher) at specific locations where it overlaps with pixel electrodes. This localized high reflectivity enhances the reflection of incident light toward users, improving user interaction without requiring the entire display structure to have high reflectivity.
Solution Approach 2:
The reflective electrode is constructed using a composite structure with multiple layers including a first electrode layer, a second electrode layer with greater thickness, and a third electrode layer. This composite material structure achieves high reflectivity while maintaining electrical conductivity and structural integrity.
3Reliability
If organic insulating layers are added for transistor insulation, then electrical insulation is improved, but light transmittance loss increases
Solution Approach 1:
The organic insulating layer is selectively removed from regions where it would interfere with light reflection, specifically from areas overlapping with pixel electrodes and power supply lines. This extraction maintains electrical insulation where needed while eliminating light transmittance loss in critical reflection zones.
Solution Approach 2:
The power supply line is positioned in a higher layer (above the organic insulating layer) to create vertical separation. This dimensional arrangement allows the organic insulating layer to remain for electrical insulation while the power supply line in the upper dimension does not interfere with light reflection paths.
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 design minimizes light transmittance loss and maintains high reflectivity, reducing manufacturing costs by eliminating the need for additional metal layers for touch electrodes.
Implementation Method 1
a user reflects an object or a background positioned in front of the display device... increasing the reflectivity of reflecting incident light
Implementation Method 2
a light emitting element above the first connection electrode and the second connection electrode, wherein the light emitting element includes a flip chip type micro light emitting diode element
Data Source
AI summary
Provided are a display device and a tiled display device. The display device according to one or more embodiments includes a substrate, transistors above the substrate, a first organic insulating layer above the transistors, a first connection electrode above the first organic insulating layer, and electrically connected to at least one of the transistors, a second connection electrode above the first organic insulating layer, a first power supply line configured to receive a first power voltage, above the first organic insulating layer, and connected to the second connection electrode, and a second organic insulating layer above the first power supply line, and defining an opening area exposing the first power supply line.