Capacitive Touch Panel Transparency and Sensitivity
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Solution Overview
Problem
Capacitive touch panels are prone to interference from electromagnetic waves, resulting in noisy input signals and low sensitivity, especially for precise inputs like Chinese characters, and the use of dedicated pens is inconvenient and not suitable for small area touch panels with high precision, while the transparent sensing layer in prior art is not fully transparent due to latticed traces causing image blurring.
Innovation Solution
A capacitive touch panel design featuring high light transmission insulating films for the surface and base substrate, transparent conductive materials like ITO for the sensing layers, and a lattice arrangement of conductive lines with vertical X and Y traces, connected through transparent insulating films and signal output wire banks, ensuring uniform transparency and improved sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If silver glue is used as the sensing layer material in prior art, then the touch panel can be made transparent, but the image becomes blurred or distorted due to different transparency between traces and non-traces causing light diffraction
Solution Approach 1:
The patent applies homogeneity by making the entire sensing layer uniformly transparent including both the trace regions and non-trace regions. The sensing layer consists of transparent conductive material formed as a continuous film rather than discrete traces, ensuring uniform light transmission and eliminating image distortion caused by transparency variations between different areas.
2Device complexity
If latticed traces are used in the sensing layer, then the capacitive touch panel can be formed with simple structure, but the image becomes blurred due to different transparency between traces and hollowed portions
Solution Approach 1:
The patent extracts the lattice trace structure from the sensing layer design. Instead of using discrete X and Y axis traces that create transparency variations, the invention uses a continuous transparent conductive film that is uniformly transparent throughout, removing the source of image distortion while maintaining the capacitive sensing function.
3Measurement precision
If dedicated pens are used to improve input sensitivity, then the precision can be enhanced, but the convenience deteriorates due to carrying requirements and potential loss
Solution Approach 1:
The patent applies universality by designing the capacitive touch panel to respond to multiple types of input objects - both dedicated pens and human fingers can be used for input. The sensing layer detects capacitive changes from any conductive object, making the device universally compatible with different input methods and eliminating the need for users to carry dedicated pens.
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 enhances the capacitive touch panel's sensitivity and precision, reduces image distortion, and allows for multi-point input control, providing a clear and vivid display screen experience without the need for dedicated pens.
Implementation Method 1
when a finger touches upon a surface of the touch panel, a capacitive effect will generate. A control circuit will assure the touch position of the finger or conductor by the variation of the capacitor.
Implementation Method 2
the material of X axis sensing layer and Y axis sensing layer are selected from a transparent film with good conductivity and low impedance
Data Source
AI summary
A capacitive touch panel, comprises a surface layer, an X axis sensing layer, a Y axis sensing layer, an insulation layer, a base substrate and a first signal output wire bank; wherein the surface layer and the bottom layer are high light transmission insulating films; the material of X axis sensing layer and Y axis sensing layer are selected from a transparent film with good conductivity and low impedance; the material of the insulation layer connected the X axis sensing layer and Y axis sensing layer being selected from transparent insulating film material; a plurality of conductive wires are arranged on the first signal output wire bank; and the X axis sensing layer has a plurality of X line traces and the Y axis sensing layer has a plurality of Y line traces.