Display Electrode Structure for ESD-Resistant Inorganic LED Panels
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Solution Overview
Problem
Inorganic light emitting diodes in inorganic electroluminescence displays are susceptible to damage from electromagnetic noise such as static electricity, leading to failure in turning ON.
Innovation Solution
A display apparatus design that includes a substrate with a plurality of pixels, each containing an inorganic light emitting element. The design features a translucent electrode on one surface side of the substrate, a first conductive layer with a higher sheet resistance than the electrode, and a cover member. This configuration allows static electricity to flow through the adhesion layer, reducing electrostatic voltage and preventing damage to the inorganic light emitting diodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a low sheet resistance electrode is used for good electrical contact, then electrical conductivity is improved, but electrostatic discharge resistance deteriorates
Solution Approach 1:
The electrode structure is segmented into multiple layers with different sheet resistance values. The lower layer has low sheet resistance for good electrical contact, while the upper layer has high sheet resistance for electrostatic discharge protection. This segmentation allows each layer to perform its specific function independently, resolving the contradiction between conductivity and ESD resistance.
Solution Approach 2:
The electrode is constructed as a composite structure with multiple conductive layers having different electrical properties. By combining materials or structures with different sheet resistance values, the electrode achieves both high electrical conductivity for normal operation and high electrostatic discharge resistance for protection, eliminating the need to choose between the two opposing requirements.
2Reliability
If electromagnetic shielding is added to protect against static electricity, then ESD resistance is improved, but light transmittance deteriorates
Solution Approach 1:
The sheet resistance parameter of the conductive layers is optimized to achieve ESD protection while maintaining light transmittance. By carefully selecting the sheet resistance values (lower layer: low resistance for conductivity; upper layer: high resistance for ESD protection), the structure provides electromagnetic shielding without significantly affecting the optical properties, as the conductive layers remain thin and translucent.
Solution Approach 2:
The electrode structure uses thin film conductive layers that are translucent. These thin films provide electromagnetic shielding and ESD protection while allowing light to pass through. The thin film approach enables the structure to fulfill both protective and optical requirements without compromising light 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
The solution effectively reduces static electricity on the inorganic light emitting elements, improving the Electrostatic Discharge (ESD) resistance and preventing damage from electromagnetic noise, thereby enhancing the reliability and longevity of the display apparatus.
Implementation Method 1
This configuration allows static electricity to flow through the adhesion layer, reducing electrostatic voltage and preventing damage to the inorganic light emitting diodes
Data Source
AI summary
A display apparatus is provided and includes substrate; pixels disposed on substrate; inorganic light emitting elements that are provided in pixels, respectively; electrode that is translucent and provided on one surface side of substrate and that is coupled to one of inorganic light emitting elements; transparent resin layer that is provided on one surface side of substrate and that covers electrode; light-shielding conductive layer that is provided on one surface side of substrate and that is in contact with transparent resin layer; and cover member that is translucent and provided on one surface side of substrate and that covers transparent resin layer, wherein substrate includes display region in which pixels are located, and peripheral region located outside display region, and light-shielding conductive layer is located in peripheral region.