Input Sensor Inspection Frequency for Micro Short Detection

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Solution Overview

Problem

Conventional display modules face challenges in detecting micro short-circuits in input sensors, which can lead to malfunction and are difficult to identify due to high resistance values, making it hard to detect micro shorts in high-frequency driving situations.

Innovation Solution

An input sensor short-circuit inspection module and method that sets an inspection frequency lower than the driving frequency, allowing the sensor to be driven in an inspection mode to detect short-circuits based on capacitance changes between adjacent electrodes, using a frequency setter, sensor driver, and short-circuit detector to identify micro shorts by measuring capacitance differences.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the input sensor is driven at high frequency for normal operation, then productivity is improved, but the ability to detect micro short-circuits deteriorates

Engineering Contradiction:

Improvedriving frequencyVSAvoidshort-circuit detection capability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The system dynamically switches between inspection mode and normal driving mode based on detection needs. The driving frequency is adjusted from high frequency during normal operation to low frequency during inspection mode, allowing the sensor to be driven in different states for different purposes - this dynamic frequency adjustment enables both high productivity during operation and reliable micro short-circuit detection during inspection

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system implements periodic inspection by alternating between normal high-frequency driving and low-frequency inspection cycles. During periodic inspection intervals, the driving frequency is reduced to allow capacitance measurement, while during other intervals normal high-frequency operation continues. This periodic switching between modes enables both continuous productivity and regular reliability verification

Inventive Principle:

Principle #19Periodic action

2Productivity

If the inspection frequency is set high, then productivity is improved, but measurement precision of capacitance differences deteriorates

Engineering Contradiction:

Improveinspection frequencyVSAvoidcapacitance detection accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The inspection frequency is changed from high to low during the inspection process. By reducing the driving frequency to a low frequency range (e.g., 1 Hz to 100 Hz), the system enables accurate capacitance measurement and detection of micro short-circuits, which would be impossible at high frequencies. This parameter change prioritizes measurement precision during inspection

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If the driving frequency is reduced for inspection, then measurement precision is improved, but productivity deteriorates

Engineering Contradiction:

Improveshort-circuit detection accuracyVSAvoidinspection speed

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The system applies partial inspection action by performing capacitance measurement on selected electrodes or regions rather than continuously inspecting all electrodes. During low-frequency inspection mode, only necessary measurements are performed to detect micro shorts, rather than exhaustive testing. This partial action approach maintains measurement precision while reducing the time penalty and preserving overall productivity

Inventive Principle:

Principle #16Partial or excessive action

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

Effectively detects micro short-circuits in input sensors by reducing the inspection frequency, enabling accurate detection of capacitance differences and improving the accuracy of short-circuit identification, even in cases with high resistance values.

Implementation Method 1

detecting the short-circuit of the input sensor based on a capacitance charged between adjacent electrodes among the plurality of electrodes of the input sensor in the inspection mode

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS12074427B2Input sensor short-circuit inspection module and input sensor short-circuit inspection method using the same

Publication Date: 2024.08.27 SAMSUNG DISPLAY CO LTD

AI summary

An input sensor short-circuit inspection method including: setting an inspection frequency for detecting a short-circuit of an input sensor comprising a plurality of electrodes; driving the input sensor in an inspection mode at the set inspection frequency; and detecting the short-circuit of the input sensor based on a capacitance charged between adjacent electrodes among the plurality of electrodes of the input sensor in the inspection mode.