Touch Buffer Layer With Hollow Particles For Display Noise Reduction
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Solution Overview
Problem
In display devices with integrated touch sensors, the capacitive coupling between the touch sensor layer and the pixel electrode layer due to a touch buffer layer can introduce detection noise, reducing touch detection accuracy and increasing manufacturing costs due to the bonding process of separate substrates.
Innovation Solution
A display device configuration with a touch buffer layer having hollow particles dispersed in an organic base material, which is optically transparent and reduces the dielectric constant, allowing the pixel electrode layer and touch sensor layer to be capacitively coupled while minimizing detection noise and eliminating the need for substrate bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the pixel substrate and sensor substrate are bonded together, then the structural stability is improved, but the manufacturing cost increases due to the bonding process
Solution Approach 1:
The patent merges the pixel substrate and sensor substrate into a single integrated substrate structure. The pixel electrode layer and touch sensor layer are formed on the same substrate without requiring bonding processes, thereby eliminating the complexity and cost of substrate bonding while maintaining structural stability through the unified substrate design.
Solution Approach 2:
The single substrate serves multiple functions: it acts as both the pixel substrate for display functionality and the sensor substrate for touch sensing functionality. This multi-functional substrate eliminates the need for separate substrates and bonding processes, reducing manufacturing complexity while maintaining the structural integrity needed for both display and touch operations.
2Ease of manufacture
If the touch sensor layer and pixel electrode layer are capacitively coupled through the touch buffer layer, then the manufacturing process is simplified, but detection noise increases reducing touch detection accuracy
Solution Approach 1:
The touch buffer layer is designed with spatially varying properties: in regions where touch detection is critical, the layer has minimal capacitance to reduce noise, while in other regions it provides adequate coupling. This local optimization allows the system to maintain manufacturing simplicity while improving touch detection accuracy in critical areas.
Solution Approach 2:
The touch buffer layer incorporates a porous structure with low dielectric constant materials. The porous architecture reduces the overall capacitance of the buffer layer by introducing air voids (which have very low dielectric constant) into the material structure, thereby reducing capacitive coupling and detection noise while maintaining the layer's structural function.
3Ease of manufacture
If a traditional touch buffer layer is used, then the manufacturing process is simple, but the dielectric constant is high causing detection noise
Solution Approach 1:
The touch buffer layer is constructed as a composite material combining organic resin base material with inorganic filler particles. This composite structure achieves a low dielectric constant by selecting materials with complementary properties: the organic resin provides flexibility and processability while the inorganic fillers (such as silica or titania with controlled characteristics) contribute to reducing the overall dielectric constant, thereby minimizing detection noise while maintaining ease of manufacture.
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 detection accuracy and reduces manufacturing costs by suppressing detection noise and allowing for a thinner, lighter display device with improved optical properties.
Implementation Method 1
the touch buffer layer being optically transparent and including a base material and hollow particles dispersed in the base material
Data Source
AI summary
A display device includes a pixel electrode layer in which a plurality of light emitting elements constituting respective pixels are arranged in two dimensions; a touch sensor layer in which a plurality of touch sensor electrodes constituting a touch sensor are arranged in two dimensions; and a touch buffer layer between the pixel electrode layer and the touch sensor layer such that the pixel electrode layer and the touch sensor layer are capacitively coupled to each other, the touch buffer layer being optically transparent and including a base material and hollow particles dispersed in the base material.