Core-Shell Organic Particles in Thin-Film Encapsulation
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Solution Overview
Problem
Display apparatuses with touch units integrated directly onto the display surface face reduced touch sensitivity due to parasitic capacitance between the display and touch units, which affects the accuracy and effectiveness of touch input detection.
Innovation Solution
A display apparatus design featuring a thin-film encapsulation layer with a combination of inorganic and organic layers, where the organic layer includes core-shell structured particles with a hollow core and a shell made from high molecular weight materials, reducing permittivity and refractive index to minimize parasitic capacitance and enhance touch sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a touch unit is arranged directly on the display unit, then the device thickness is reduced, but the touch sensitivity deteriorates due to parasitic capacitance
Solution Approach 1:
A thin-film encapsulation layer comprising organic and inorganic layers is introduced as an intermediary between the display unit and touch unit. The organic layer has a permittivity of 2.6 or less and refractive index of 1.4 or less, acting as a mediator that reduces parasitic capacitance while maintaining direct contact integration, thus resolving the contradiction between reduced thickness and improved touch sensitivity.
Solution Approach 2:
The permittivity and refractive index parameters of the encapsulation layer are optimized to specific values (permittivity ≤ 2.6, refractive index ≤ 1.4) to minimize parasitic capacitance effects. By changing these material parameters, the system achieves both thin form factor and high touch sensitivity simultaneously.
2Measurement precision
If the organic encapsulation layer has low permittivity to reduce parasitic capacitance, then touch sensitivity improves, but the encapsulation effectiveness may deteriorate
Solution Approach 1:
The encapsulation structure uses a composite of organic and inorganic layers, where the organic layer provides low permittivity (≤2.6) for reduced parasitic capacitance, while the inorganic layer contributes to encapsulation effectiveness. This composite material approach allows simultaneous achievement of high touch sensitivity and reliable encapsulation protection.
Solution Approach 2:
Different layers of the encapsulation structure have different material properties optimized for different functions: the organic layer is optimized for electrical properties (low permittivity) to improve touch sensitivity, while the inorganic layer is optimized for protective properties to ensure encapsulation effectiveness, creating local quality differentiation throughout the encapsulation system.
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 parasitic capacitance and improves touch sensitivity by optimizing the thin-film encapsulation layer's properties, allowing for more accurate and responsive touch input detection while maintaining a reduced thickness.
Implementation Method 1
a sensitivity of the touch unit may be reduced by a parasitic capacitance between the display unit and the touch unit
Implementation Method 2
The organic encapsulation layer may have permittivity of 2.6 or less
Implementation Method 3
The organic encapsulation layer may have a refractive index of 1.4 or less
Data Source
AI summary
A display apparatus includes a substrate comprising a display area and a non-display area. A light-emitting device is on the display area. A thin-film encapsulation layer is on the light-emitting device. The thin-film encapsulation layer includes at least one inorganic encapsulation layer and at least one organic encapsulation layer. The organic encapsulation layer includes a plurality of organic particles having a core-shell structure that includes a hollow core and a shell surrounding the hollow core. A touch unit is on the thin-film encapsulation layer.