Input-Sensing Layer Structure With Hollow Polymers for Touch Sensitivity
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Solution Overview
Problem
Existing input-sensing units in flexible and foldable display devices face challenges in achieving high touch sensitivity and flexibility while maintaining reliable fabrication processes.
Innovation Solution
The input-sensing unit is designed with a multi-layered structure comprising a first and second conductive layer, and corresponding organic layers with hollow polymers, where the organic layers include base resins and hollow polymers, and are fabricated using a method involving the formation of conductive layers, organic layer compounds, and penetration holes, optimizing dielectric constants and touch sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic layers are used in input-sensing units, then the structure is simple, but touch sensitivity is insufficient due to high dielectric constants
Solution Approach 1:
The patent applies composite materials by combining base resin with hollow polymer particles to create an organic layer with reduced dielectric constant. The hollow polymer particles (containing air or vacuum) dispersed in the base resin form a composite structure that lowers the overall dielectric constant from typical values of 3.0-4.0 to below 2.5, thereby improving touch sensitivity while maintaining structural integrity
Solution Approach 2:
The patent utilizes porous materials through the incorporation of hollow polymer particles with internal cavities. These particles contain air or vacuum spaces that reduce the dielectric constant of the organic layer. The porous structure is achieved by selecting hollow polymer particles with specific size ranges (0.1-10 μm diameter) and controlling their content (10-70 wt%) in the base resin
2Adaptability or versatility
If flexible display devices are implemented, then adaptability is improved, but maintaining high touch sensitivity becomes difficult
Solution Approach 1:
The patent applies parameter changes by modifying the dielectric constant parameter of the organic layer through the addition of hollow polymer particles. This parameter change (reducing dielectric constant from 3.0-4.0 to below 2.5) directly improves touch sensitivity. The solution maintains flexibility by using organic materials that are inherently flexible and by controlling the particle size and distribution to avoid brittleness
3Reliability
If traditional fabrication processes are used, then manufacturing is straightforward, but achieving optimal touch sensitivity is difficult
Solution Approach 1:
The patent applies preliminary action by pre-selecting hollow polymer particles with specific characteristics (size range of 0.1-10 μm, dielectric constant < 2.0, and 10-70 wt% content) before incorporating them into the base resin. This preliminary specification of particle properties ensures that the organic layer achieves the target dielectric constant (below 2.5) without requiring complex post-processing or adjustment steps during fabrication
Solution Approach 2:
The patent utilizes parameter changes by controlling the weight percentage of hollow polymer particles (10-70 wt%) to achieve the desired dielectric constant. This parameter control provides a straightforward fabrication approach where the touch sensitivity is optimized by simply adjusting the particle content within the specified range, eliminating the need for complex multi-step processes
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 enhances touch sensitivity and flexibility, reduces parasitic capacitance, and simplifies the fabrication process, resulting in a highly reliable input-sensing unit for display devices.
Implementation Method 1
the first and second organic layers may have dielectric constants ranging from about 1.3 to about 3.0
Implementation Method 2
Curing the organic layer compound may include curing the organic layer compound using an ultraviolet light or heat
Data Source
AI summary
The present application relates to an input sensing unit and a display device using the same. A method of fabricating an input-sensing unit includes forming a first conductive layer on an inorganic layer, supplying and curing an organic layer compound on the first conductive layer to form a first organic layer, forming a second conductive layer on the first organic layer, and supplying and curing the organic layer compound on the second conductive layer to form a second organic layer, in which the organic layer compound includes a base resin and a hollow polymer.