Display Module Inspection via Capacitance Frequency Tuning
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Solution Overview
Problem
Existing display module inspection technologies fail to effectively detect defects, particularly in the coupling of stabilization modules, which can lead to touch input sensing failures and luminance issues.
Innovation Solution
A display module inspection device and method that includes a power supply, a circuit board with a stabilizer, a display panel, and an input sensor with electrodes, utilizing inspection logic to set a driving frequency and voltage within predetermined ranges to measure capacitance between electrodes, thereby determining the presence of defects by distinguishing between properly coupled and uncoupled stabilization modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing display module inspection technologies are used, then inspection can be performed, but defects in stabilization module coupling cannot be effectively detected
Solution Approach 1:
The patent introduces a stabilization module as an intermediary component between the power supply and the display module. This stabilization module includes a capacitor that creates a measurable capacitance value, serving as a mediator that enables indirect detection of the coupling status. By measuring the capacitance between the first electrode (connected to power supply) and second electrode (connected to display module), the system can detect whether the stabilization module is properly coupled without directly inspecting the coupling connection itself.
Solution Approach 2:
The patent replaces direct mechanical or visual inspection methods with electrical field-based capacitance measurement. Instead of using physical probes or visual examination to detect coupling status, the system uses an electric field to measure capacitance values. This substitution of measurement methodology enables non-contact, automated detection of stabilization module coupling status with higher precision.
2Measurement precision
If capacitance measurement is performed without setting driving frequency, then measurement can be made, but measurement precision is insufficient to distinguish coupled and uncoupled states
Solution Approach 1:
The patent applies parameter changes by setting the driving frequency of the second electrode to a specific frequency range (e.g., 100 Hz to 10 kHz) during capacitance measurement. This frequency parameter optimization ensures that the measured capacitance value clearly distinguishes between coupled and uncoupled stabilization module states. By controlling the driving frequency parameter, the system achieves high measurement precision without requiring complex measurement circuits or multiple measurement conditions.
3Productivity
If stabilization module coupling is not properly detected, then production continues, but touch input sensing failures and luminance issues occur
Solution Approach 1:
The patent implements preliminary action by performing capacitance-based coupling detection during the manufacturing or assembly process, before the display module is finalized or shipped. The inspection system measures the capacitance value early in the production flow to determine whether the stabilization module is properly coupled. If the coupling is defective, the system can flag the module for rework or rejection before it proceeds to subsequent production steps, preventing defective modules from causing touch input sensing failures or luminance issues in final products.
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 solution enables accurate detection of defects in display modules by clearly differentiating between capacitance values when the stabilization module is coupled or uncoupled, ensuring proper touch input sensing and luminance performance.
Implementation Method 1
inspection logic configured to measure a value of capacitance between the first electrode and the second electrode of the display
Data Source
AI summary
An inspection device inspects a display for defects. The display includes a power supply, a circuit board having a stabilizer to stabilize the power supply, a display panel which is electrically connected to the circuit board and has a first electrode, and an input sensor which is disposed on the display panel and has a second electrode. The inspection logic measures a value of capacitance between the first electrode and the second electrode of the display, and includes a frequency setter that sets a driving frequency of the second electrode to a frequency in a predetermined range.