Touch Panel Metal Wire Detection Accuracy
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Solution Overview
Problem
Conventional touch panels with resistance film methods face issues such as high resistance leading to low detection accuracy, size limitations, costly manufacturing, limited transmissivity, electrode damage, and reliability concerns due to metal oxide electrodes, which affect user experience and detection efficiency.
Innovation Solution
A touch panel design featuring a first and second substrate with metal lines, a resin film acting as a polarizing plate, and optional cushion layers to absorb unevenness, allowing for improved touch feedback and increased panel size while reducing costs and enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transparent electrode line width is decreased to increase detection accuracy, then detection accuracy is improved, but resistance value increases making detection impossible
Solution Approach 1:
The patent replaces expensive, fragile high-resistance transparent electrodes with inexpensive, durable low-resistance metal wires. The metal wires can be made thin without becoming non-functional, solving the contradiction between thinness (for accuracy) and resistance (for functionality).
Solution Approach 2:
The patent changes the material parameter from transparent electrode material to metal wire material, fundamentally altering the resistance characteristic. This allows the use of thinner conductors with lower resistance, simultaneously improving detection accuracy and maintaining detection capability.
2Reliability
If transparent electrode thickness is increased to reduce resistance, then resistance is reduced, but gap between electrodes cannot be decreased due to etching taper
Solution Approach 1:
The patent replaces etched transparent electrodes with metal wires that can be formed into straight, thin structures without taper. This eliminates the manufacturing precision problem while maintaining low resistance through the metal material's inherent properties.
3Ease of operation
If resistance film method is used to detect touch input, then detection is possible, but detection accuracy is lowered when detecting multiple input points
Solution Approach 1:
The patent uses a matrix array of discrete metal wire intersections rather than continuous transparent electrodes. Each intersection point can be independently detected, enabling accurate multi-point touch detection without the averaging effect that limits resistance film methods.
4Measurement precision
If stripe-shaped transparent electrodes are used, then detection accuracy can be increased, but manufacturing cost increases and transmissivity is limited
Solution Approach 1:
The patent replaces expensive transparent electrode materials and complex stripe patterns with inexpensive metal wires that can be formed using simpler, more cost-effective manufacturing processes while achieving equal or better detection accuracy.
Solution Approach 2:
The patent changes from transparent electrode material to metal wire material, and from stripe-shaped continuous electrodes to discrete wire intersections. This material and structural change reduces manufacturing cost while improving or maintaining detection accuracy through the metal's superior electrical properties.
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 provides excellent touch feedback, increases panel size beyond 17 inches, reduces manufacturing costs, and enhances detection accuracy and reliability by using metal lines with lower resistance and digital detection, offering higher resolution and durability.
Implementation Method 1
a resin film 26 which is adhered to the first substrate 12 on a side opposite to the second substrate 14
Implementation Method 2
a first electrode 16 which is constituted of a plurality of metal lines
Implementation Method 3
capacity between the finger and the transparent electrode TLINE is detected
Data Source
AI summary
A display device with a touch panel includes the touch panel having a first substrate having a detection area to detect a coordinate and an outside area in which at least one external terminal is formed, a plurality of first lines to detect the coordinate in the detection area, a plurality of second lines to detect the coordinate in the detection area, wherein each of the plurality of first lines traverse each of the plurality of second lines. An organic emitting display panel is arranged under the touch panel, and a circular polarizing plate arranged at a side of the touch panel opposite to the organic emitting display panel. The organic emitting display panel, the touch panel, and the circular polarizing plate are arranged in this order.