OLED Panel Impedance Inspection Before Glass Cutting
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Solution Overview
Problem
Existing organic light-emitting display apparatuses lack an effective method to inspect the impedance of organic light-emitting devices, which is crucial for determining defects and ensuring quality during the manufacturing process.
Innovation Solution
An inspecting apparatus and method that includes a connector, panel driver, and impedance meter to measure the impedance of organic light-emitting devices on a glass panel, using direct and alternating current signals to determine impedance parameters and detect defects based on impedance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If impedance measurement is performed after cutting into display panel units, then device complexity is reduced, but productivity is worsened due to additional inspection steps required later
Solution Approach 1:
The patent applies preliminary action by performing impedance measurement on the glass panel before it is cut into individual display panel units. This allows inspection to be conducted at an earlier stage in the manufacturing process, enabling defect detection before final product formation and avoiding the need for additional inspection steps after cutting.
Solution Approach 2:
The patent implements universality by designing the connector to interface with the glass panel structure that accommodates multiple display panel units simultaneously. The measurement system can inspect multiple units on a single glass panel in one operation, making the inspection process universal across all units before separation.
2Productivity
If impedance measurement is performed on glass panel before cutting, then productivity is improved by early defect detection, but device complexity increases due to specialized measurement equipment
Solution Approach 1:
The patent performs impedance measurement on the glass panel before cutting into display panel units, enabling early defect detection. This preliminary inspection allows defective panels to be identified and removed before final product formation, improving manufacturing efficiency by preventing rework and reducing waste.
Solution Approach 2:
The patent introduces a connector as an intermediary component that facilitates the measurement process. The connector includes measurement pads that electrically connect to the display panel units on the glass panel, serving as a mediator between the measurement equipment and the panels, thereby simplifying the overall system architecture.
3Measurement precision
If multiple measurement signals are applied to organic light-emitting device, then measurement precision is improved, but device complexity increases due to multiple signal sources
Solution Approach 1:
The patent merges multiple measurement signals (direct current signal and alternating current signal) into a single measurement process. By applying both signals through the same connector and measurement path, the system achieves precise impedance measurement without requiring separate measurement systems, thus reducing overall device complexity.
Solution Approach 2:
The patent implements multi-functionality in the measurement system by using a single measurement apparatus that can handle both direct current and alternating current signals. The impedance meter is designed to generate and process multiple signal types through a unified interface, eliminating the need for separate measurement equipment for each signal type.
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 accurate detection of defective display panels by measuring impedance before cutting into units, improving manufacturing efficiency and quality control by identifying defects early in the production process.
Implementation Method 1
measuring a mother glass panel or a display panel includes: measuring an impedance of the organic light-emitting device
Data Source
AI summary
Provided is an inspecting apparatus for an organic light-emitting display apparatus, including a connector including an inspection pad electrically connected to a signal pad of a display panel included in a glass panel, a panel driver electrically connected to the connector and supplying a driving signal for driving the display panel, and an impedance meter electrically connected to the connector and that measures the impedance of an organic light-emitting device included in the display panel.