Transparent Touch Panel Uniform Transmittance Design
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Solution Overview
Problem
Capacitive touch panels with non-uniform transmittance distribution due to etching patterns in transparent conductive films cause image distortion and noise, and attempts to uniformize transmittance can lead to electromagnetic interference and error signals.
Innovation Solution
A transparent touch panel design using fine insulation wires to confine electrode areas and forming disconnected dummy patterns in waste etching areas with specific geometrical shapes, ensuring uniform transmittance and reduced capacitance noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode areas and waste etching areas are formed with traces on the transparent conductive film, then the touch sensing function is achieved, but the transmittance distribution becomes non-uniform causing image distortion and apparent patterns
Solution Approach 1:
The patent applies local quality by differentiating the treatment of electrode areas and waste etching areas. The electrode areas maintain continuous conductive film for sensing function, while the waste etching areas are filled with transparent insulating material to uniformize transmittance. This localized differentiation resolves the contradiction between maintaining sensing functionality and achieving uniform light transmission.
2Illumination intensity
If the material in the waste etching area is retained to reduce transmittance differences, then the transmittance uniformity is improved, but noise and electromagnetic interference are generated interfering with sensing signals
Solution Approach 1:
The patent introduces transparent insulating material as an intermediary substance in the waste etching areas. This material serves dual purposes: it uniformizes the transmittance distribution like retained material would, but simultaneously provides electrical insulation to prevent noise and electromagnetic interference that would occur with conductive material. The intermediary resolves the contradiction between transmittance uniformity and electrical interference prevention.
3Adaptability or versatility
If large waste etching areas are created to form electrode patterns, then the electrode layout flexibility is improved, but the transmittance non-uniformity and potential noise generation are worsened
Solution Approach 1:
The patent applies local quality by selectively treating waste etching areas with transparent insulating material based on their size and location. This allows flexible electrode layout design while ensuring that waste areas, regardless of size, are uniformly filled with insulating material to maintain transmittance uniformity and prevent interference, thus resolving the contradiction between layout flexibility and optical quality.
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 design achieves a flat surface with uniform transmittance distribution, minimizing image distortion and signal interference, while maintaining effective sensing capabilities.
Implementation Method 1
the light passing through the film is non-uniformly deflected
Implementation Method 2
the insulating layer being transparent insulated film; Fine insulation wires are used to confine the boundaries of a plurality of electrodes
Implementation Method 3
capacitive touch panels with multiple sensing points are the main trend in the improvement of the touching sensing effect
Data Source
AI summary
A transparent touch panel comprises a first axis sensing layer, a second axis sensing layer and an insulating layer between the first axis sensing layer and the second axis sensing layer; the first axis sensing layer and second axis sensing layer being transparent conductive films, and the insulating layer being transparent insulated film. In each of the first axis sensing layer and second axis sensing layer, first insulating wires serve to delimit a plurality of electrode areas and a plurality of waste etching areas; and signal conductive wires serve to delimit a dummy pattern in the waste etching areas; the electrodes areas include a plurality of sensing electrodes and/or a plurality of signal conductive wires and the dummy pattern includes a plurality of small sub-areas which are disconnected to each other.