Display Apparatus Translucent Electrode Static Electricity Dissipation
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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
1Illumination intensity
If a translucent electrode is used to allow light transmission, then the display brightness is improved, but the electrode becomes susceptible to damage from static electricity
Solution Approach 1:
The patent uses a composite structure consisting of a first conductive layer (translucent material like ITO) and a second conductive layer (opaque material like Al or Mo), where the first layer provides light transmission and the second layer provides ESD protection. This composite material approach allows both transparency and electrostatic resistance to be achieved simultaneously.
Solution Approach 2:
The first conductive layer acts as an intermediary between the translucent electrode and the ground potential, providing a pathway for static electricity to dissipate safely. This intermediate layer protects the electrode from direct exposure to electrostatic discharge while maintaining optical transparency.
2Reliability
If a conductive layer with low sheet resistance is used to protect against static electricity, then ESD resistance is improved, but light transmission is reduced
Solution Approach 1:
The patent applies different conductive materials with different properties to different functional requirements: the first conductive layer uses a translucent material with higher sheet resistance optimized for light transmission, while the second conductive layer uses an opaque material with lower sheet resistance optimized for ESD protection. Each layer has locally optimized quality for its specific function.
Solution Approach 2:
The conductive protection structure is segmented into two distinct layers: the first conductive layer for optical transparency and the second conductive layer for electrostatic protection. This segmentation allows each layer to be independently optimized for its specific function without compromising the other.
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.