Touch Panel Inspection via Pulsed Voltage Resistance Measurement
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Solution Overview
Problem
Current inspection methods for touch panels, which rely on physical contact, result in unstable and potentially damaging assessments of touch sensitivity due to the need for multiple steps and risk of scratching the panel surface.
Innovation Solution
An inspection device and method that utilize pulsed voltage to measure the resistance of a transparent film in touch panels by obtaining background capacitance with and without the film connected to ground, and applying opposite-phase voltages to determine the film's resistance value, allowing for stable and non-destructive evaluation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a testing conductor is brought into contact with the panel surface to detect touch sensitivity deterioration, then the inspection can detect resistance value changes, but the number of inspection steps increases and the testing conductor cannot uniformly come into contact with the panel surface, leading to unstable inspection
Solution Approach 1:
The patent replaces the mechanical contact method (sliding a physical testing conductor across the panel surface) with an electrical field-based measurement method. The inspection device applies a test voltage to the transparent film through electrodes and measures the resulting current or resistance without requiring physical contact with the panel surface, thereby eliminating contact uniformity issues and reducing inspection steps.
Solution Approach 2:
The patent introduces an electrical field as an intermediary between the inspection device and the transparent film. Instead of directly contacting the panel surface with a physical conductor, the device uses electrical signals applied through electrodes to indirectly measure the resistance characteristics of the transparent film, achieving stable and repeatable measurements.
2Measurement precision
If a testing conductor is brought into contact with the panel surface to detect touch sensitivity deterioration, then the inspection can detect resistance value changes, but the panel surface may be scratched due to contact with the testing conductor
Solution Approach 1:
The patent replaces the mechanical contact method with an electrical field-based measurement method that does not require physical contact with the panel surface. By applying test voltages through electrodes and measuring electrical parameters, the system achieves accurate resistance measurement without the risk of scratching or damaging the transparent film or panel surface.
Solution Approach 2:
The patent measures the electrical properties (resistance, current flow) of the transparent film indirectly through electrical signals rather than physically interacting with the material. This allows obtaining accurate measurement data about the film's resistance characteristics without physically touching or potentially damaging the panel surface.
3Measurement precision
If multiple inspection steps are used to check touch sensitivity by sliding a testing conductor, then comprehensive inspection can be performed, but the inspection process becomes complex and time-consuming
Solution Approach 1:
The patent merges multiple inspection steps into a single integrated measurement process. Instead of separately performing contact tests, uniformity checks, and resistance measurements, the system combines all these functions into one electrical field-based measurement that simultaneously evaluates touch sensitivity, contact uniformity, and resistance values through a single voltage application and current measurement sequence.
Solution Approach 2:
The patent implements a continuous inspection process where the test voltage is applied and measurements are taken in a seamless manner without requiring multiple discrete steps. The electrical field measurement can be performed continuously across the panel surface by scanning electrodes or using array electrodes, eliminating the need to stop and reposition physical testing conductors between measurements.
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 approach enables stable and reproducible inspection of touch panel performance by avoiding physical contact and preventing damage to the panel surface, while accurately detecting resistance value changes that indicate touch sensitivity deterioration.
Implementation Method 1
a background capacitance obtaining section for obtaining a background capacitance of the touch panel by applying a first pulsed voltage to the sensor
Implementation Method 2
a switching section for connecting the transparent film to a ground or to a voltage generator for applying a second pulsed voltage, in accordance with a resistance value of the transparent film
Data Source
AI summary
An embodiment of the present invention makes it possible to carry out stable inspection on performance of a touch panel. An inspection device for inspecting a touch panel on a basis of a resistance value of a transparent film of the touch panel, which includes at least the transparent film, a dielectric member, and a sensor stacked on top of each other, includes: an integrating circuit configured to obtain a background capacitance of the touch panel by applying a first pulsed voltage to the sensor; and a switch configured to connect the transparent film to a ground or to a generator configured to generate a second pulsed voltage which is opposite in phase to the first pulsed voltage.