OLED Pad Electrode Embossed Reflective Layer UV Curing
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Solution Overview
Problem
Existing organic light-emitting display apparatuses face challenges in efficiently utilizing ultraviolet (UV) rays for curing resins and reducing wiring resistance, particularly due to the presence of non-light-transmission layers and wide pad electrodes which hinder UV transmission and increase wiring resistance.
Innovation Solution
The use of a pad electrode with an embossing-shaped conductive reflective layer, which includes a conductive layer and a conductive reflective layer, electrically coupled to the TFT or OLED, and features insulating members of varying heights to improve UV utilization efficiency and reduce wiring resistance by enhancing light diffusion and signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wide pad electrode is used to reduce wiring resistance, then electrical conductivity is improved, but UV ray transmission is hindered
Solution Approach 1:
The pad electrode is designed with an embossed shape featuring protruding portions and recessed portions, creating local variations in surface topology. This allows different regions to serve different functions: the protruding portions facilitate UV ray transmission and reflection, while the overall structure maintains electrical conductivity for signal transmission.
Solution Approach 2:
The pad electrode transitions from a flat two-dimensional structure to a three-dimensional embossed structure with varying heights. This dimensional change enables the electrode to both conduct electricity effectively and allow UV rays to pass through the recessed areas, resolving the contradiction between electrical conductivity and UV transmission.
2Reliability
If a non-light-transmission layer is present in the pad electrode, then electrical conductivity is improved, but UV ray transmission is blocked
Solution Approach 1:
The pad electrode is segmented into multiple functional regions through the embossed structure, with protruding portions and recessed portions creating distinct zones. The recessed portions allow UV rays to pass through while the conductive material in protruding portions maintains electrical conductivity, effectively separating the conflicting requirements of electrical conduction and light transmission.
Solution Approach 2:
The embossed structure acts as an intermediary between the conductive material and UV rays. The recessed portions serve as channels that allow UV transmission while the conductive material surrounding these recesses maintains electrical connectivity, mediating between the two conflicting requirements.
3Ease of manufacture
If the pad electrode structure is simplified, then manufacturing is easier, but UV utilization efficiency is reduced
Solution Approach 1:
The embossed shape parameters (protruding portions, recessed portions, heights, widths) are optimized to balance manufacturing feasibility with UV transmission efficiency. The structure uses standard embossing techniques that can be integrated into existing manufacturing processes while achieving the dual function of electrical conduction and UV transmission.
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 improves UV-ray utilization efficiency for curing resins and reduces wiring resistance, allowing for a more efficient manufacturing process and potentially wider viewing angles and higher contrast in organic light-emitting displays.
Implementation Method 1
a pad electrode for reducing wiring resistance may be provided
Implementation Method 2
improve UV utilization efficiency by enhancing light diffusion
Implementation Method 3
The organic light-emitting display apparatus emits light when excitons, which are generated when holes injected from the hole-injection electrode and electrons injected from the electron-injection electrode are combined, drop from an excitation state to a ground state.
Data Source
AI summary
An organic light-emitting display apparatus includes: a substrate; a display part on the substrate and configured to display an image, the display part including a thin-film transistor (TFT) and an organic light-emitting diode (OLED); and a pad electrode on the substrate and outside the display part, and the pad electrode includes an embossed-shaped conductive reflective layer.