Touch Line Detection Device for Hybrid In-Cell Substrates
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Solution Overview
Problem
In the manufacturing process of hybrid in-cell display products, touch sensing detection cannot be performed before assembling the CF and TFT substrates due to the inability to transmit Tx signals through display chips at the CELL stage.
Innovation Solution
A test device with a first fastener structure for positioning a to-be-tested substrate with touch lines, a second fastener structure for a test match panel, and a change-over flexible printed circuit board that allows for signal input and sensing signal capture, enabling touch sensing detection before assembly by assembling the substrate and test match panel opposite to each other.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional touch sensing detection methods are used, then touch sensing detection can be performed on finished products, but touch sensing detection cannot be performed before assembling CF and TFT substrates in the CELL stage
Solution Approach 1:
The patent applies preliminary action by enabling touch sensing detection before the final assembly of CF and TFT substrates. The test device allows detection of touch line healthiness at the CELL stage, prior to complete assembly, thereby identifying defects early in the manufacturing process and preventing unhealthy substrates from progressing further.
Solution Approach 2:
The patent uses an intermediary approach by introducing a test match panel and change-over flexible printed circuit board as mediators. The test match panel provides reference touch lines, and the change-over FPC enables signal transmission without requiring the complete assembled product, thus facilitating detection at intermediate stages.
2Loss of substance
If touch sensing detection is performed before assembly, then material loss and costs are reduced, but the device complexity increases due to additional fastener structures and signal transmission paths
Solution Approach 1:
The patent applies segmentation by dividing the test device into distinct functional modules: first fastener structure for positioning the to-be-tested substrate, second fastener structure for the test match panel, and third fastener structure for the change-over FPC. This modular segmentation enables complex detection functionality while maintaining structural organization and manageability.
Solution Approach 2:
The patent implements multi-functionality by designing the test device to perform multiple operations: positioning substrates, transmitting test signals, capturing sensing signals, and detecting touch line healthiness. The change-over FPC serves both as a signal transmission path and as part of the fastening mechanism, reducing the need for separate dedicated components.
3Measurement precision
If the to-be-tested substrate is positioned opposite the test match panel, then touch line healthiness can be effectively detected, but the positioning accuracy requirements increase
Solution Approach 1:
The patent applies self-service by incorporating positioning points on the horizontal support surface that enable the to-be-tested substrate to be automatically positioned and fastened. The first fastener structure includes positioning points that align with corresponding features on the substrate, ensuring accurate positioning without requiring complex external positioning systems.
Solution Approach 2:
The patent ensures equipotentiality by designing the first and second fastener structures to provide equivalent positioning and support capabilities for both the to-be-tested substrate and the test match panel. This symmetric design ensures that both substrates are positioned at the same precision level, facilitating accurate touch line detection while maintaining manufacturing feasibility.
Data Source
AI summary
The present disclosure provides a test device and a test method using the test device. The test device includes a first fastener structure for fastening a to-be-tested substrate with first touch lines, a second fastener structure for fastening a test match panel with second touch lines, and the first touch lines and the second touch lines forming a touch module, a third fastener structure for supporting a change-over flexible printed circuit board, a signal input structure for electrically connecting to one of a circuit board in the test match panel and the first touch lines through the change-over flexible printed circuit board, and inputting trigger data signals, a sensing signal capture structure for capturing touch sensing signals in the first touch line or the second touch lines.