Capacitive Touch Panel with Antireflective Layer and Non-Conductive Stylus Detection
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Solution Overview
Problem
Capacitive touch panels struggle to detect input coordinates accurately when using non-conductive materials like a resin stylus, requiring increased electrode numbers, which complicates wiring and increases costs, and can lead to image quality deterioration when integrated with display devices.
Innovation Solution
A capacitive touch panel design featuring a first substrate with coordinate detection electrodes and a second substrate with a conductive layer, sandwiching non-conductive spacers, and an antireflective layer to enhance transmittance and durability, allowing input from insulating materials like a resin pen without mechanical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of detection electrodes is increased to enable accurate detection with non-conductive materials, then input detection accuracy is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent introduces a conductive layer as an intermediary between the non-conductive stylus and the detection electrodes. This conductive layer is formed on the stylus tip through charge accumulation, enabling capacitance coupling with the detection electrodes without requiring direct contact or increasing electrode density. The intermediary conductive layer allows accurate detection while maintaining a simple electrode structure.
Solution Approach 2:
The patent changes the detection parameter from direct contact resistance measurement to capacitance measurement. By detecting capacitance changes between the conductive layer on the stylus and the detection electrodes, the system can accurately detect touch positions using non-conductive materials without increasing the number of electrodes or complexifying the electrode structure.
2Measurement precision
If the number of detection electrodes is increased to enable accurate detection with non-conductive materials, then input detection accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The conductive layer formed on the stylus tip serves as a mediator that enables capacitance coupling detection. This approach allows the use of standard electrode configurations while achieving accurate detection with non-conductive stylus, thereby avoiding the increased manufacturing costs associated with high-density electrode structures.
Solution Approach 2:
The patent replaces mechanical contact-based detection with capacitance coupling detection. This substitution eliminates the need for complex mechanical contact structures and high-density electrodes, simplifying manufacturing while enabling accurate detection with non-conductive materials.
3Ease of operation
If a conductive stylus is used to make input to capacitive touch panel, then input detection works, but the structure becomes more complex and reliability decreases
Solution Approach 1:
The patent changes the operational parameter from direct conductive contact to capacitance coupling. By detecting capacitance changes between the conductive layer on the stylus and the detection electrodes, the system achieves reliable operation with non-conductive stylus, eliminating the reliability issues associated with conductive stylus and complex wiring.
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
Enables accurate detection of input coordinates from non-conductive materials, improves image quality by reducing reflection, and simplifies the touch panel structure, reducing the number of electrodes and signal connections, thus enhancing reliability and cost-effectiveness.
Implementation Method 1
a capacitive coupling type of detecting a change in capacitance thereof
Implementation Method 2
an antireflective layer formed on at least one of an interface between the first substrate and a space defined by the plurality of nonconductive spacers and an interface between the second substrate and the space defined by the plurality of nonconductive spacers
Data Source
AI summary
Provided is a capacitive touch panel, including: a plurality of coordinate detection electrodes (XP1, XP2, YP2) for detecting X-Y position coordinates; a first substrate (1) including the plurality of coordinate detection electrodes; and a second substrate (6) disposed to be opposed to the first substrate, in which: one of the first substrate and the second substrate includes an elastic layer lower (5) in rigidity than the second substrate and a conductive layer (ZP) having conductivity; the elastic layer and the conductive layer are disposed between the plurality of coordinate detection electrodes and the second substrate; a space between the first substrate and the second substrate defined by a plurality of nonconductive spacers (4); and an antireflective layer is formed on at least one of an interface between the space and the first substrate and an interface between the space and the second substrate.