Touch Controller Crystal Inspection for Capacitor and Oscillator Defects
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Solution Overview
Problem
Existing display devices face challenges in accurately identifying defects in crystal units, particularly in capacitors and oscillators, which affect the functionality of touch sensors.
Innovation Solution
A display device with a touch sensor and a crystal unit connected to a touch controller, utilizing sensing channels to measure capacitances of external capacitors and an inspection unit to determine normal values, switching to an oscillation mode for accurate defect detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the crystal unit is connected to sensing channels to measure external capacitance, then the ability to detect capacitor defects is improved, but the complexity of the inspection system increases
Solution Approach 1:
The inspection process is divided into two distinct modes: a first mode for measuring external capacitance values of capacitors connected to the crystal unit, and a second mode for measuring oscillation frequency. This segmentation allows each measurement type to be performed with optimized circuit configurations, improving measurement precision while managing system complexity through structured operational phases.
Solution Approach 2:
The touch controller dynamically switches between the first inspection mode and the second inspection mode based on measurement requirements. The controller configures the crystal unit connection differently in each mode - connecting to sensing channels in the first mode and to the feedback circuit in the second mode. This dynamic reconfiguration enables accurate defect detection without requiring permanently complex circuitry.
2Measurement precision
If the crystal unit is connected to the feedback circuit to measure oscillation frequency, then the ability to detect oscillator defects is improved, but the complexity of switching connection modes increases
Solution Approach 1:
The touch controller is designed with multi-functionality, serving both as a touch sensor controller and as an inspection device for the crystal unit. The same controller that manages touch sensor operations also performs crystal unit inspections by switching between two inspection modes. This universality reduces overall system complexity by consolidating inspection functions within the existing touch controller rather than adding separate dedicated inspection equipment.
Solution Approach 2:
The touch controller dynamically reconfigures its internal connections to switch between the first inspection mode (measuring external capacitance via sensing channels) and the second inspection mode (measuring oscillation frequency via feedback circuit). This dynamic switching capability allows the controller to adapt its connection topology based on the specific defect type being inspected, improving measurement precision for both capacitor and oscillator defects without requiring permanently complex circuitry.
3Reliability
If both external capacitance and oscillation frequency are measured, then the comprehensive ability to identify all crystal unit defects is improved, but the inspection time increases
Solution Approach 1:
The inspection process employs periodic action by sequentially executing the first inspection mode and the second inspection mode in distinct time periods. The touch controller first performs external capacitance measurement in the first mode, then switches to perform oscillation frequency measurement in the second mode. This periodic execution of different inspection modes ensures comprehensive defect identification while managing inspection time through structured sequential operations rather than simultaneous complex measurements.
Solution Approach 2:
The touch controller dynamically switches between inspection modes to perform comprehensive defect identification. By transitioning from the first inspection mode (capacitance measurement) to the second inspection mode (frequency measurement), the system achieves complete defect coverage. The dynamic nature of mode switching allows the system to optimize inspection time by performing measurements in the most efficient sequence rather than requiring all measurement circuits to operate simultaneously.
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 precise identification of defects in crystal units, distinguishing between capacitor and oscillator issues, ensuring reliable touch sensor operation.
Implementation Method 1
the at least one sensing channel measures at least one of a capacitance of the first external capacitor and a capacitance of the second external capacitor
Implementation Method 2
in the second mode, the feedback circuit outputs an oscillation frequency of the crystal oscillator
Data Source
AI summary
A display device includes a touch sensor including a touch panel and a touch controller, and a crystal unit connected to the touch controller. The touch controller includes a plurality of sensing channels connected to the touch panel, and a feedback circuit. The crystal unit is connected to at least one of the sensing channels in a first mode, and is connected to the feedback circuit in a second mode.