Substrate Mapping Sensor for Presence and Sagging Detection

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Solution Overview

Problem

Existing substrate detection systems fail to accurately detect the presence and sagging state of substrates in display device manufacturing, leading to potential damage from sagging support bars and increased installation space and costs.

Innovation Solution

A substrate mapping sensor using light transmitting and receiving units to detect substrate presence and sagging, employing infrared light sources and photodiodes to determine substrate state in real-time, minimizing damage and installation costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If existing substrate detection systems are used, then substrate presence can be detected, but substrate sagging state cannot be accurately detected leading to potential damage

Engineering Contradiction:

Improvesubstrate state detection accuracyVSAvoidsubstrate damage prevention

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The detection system is segmented into multiple light transmitting units and light receiving units positioned at different locations. Each unit pair detects specific portions of the substrate, with the second pair specifically detecting sagging states. This segmentation enables precise detection of different substrate conditions without requiring a single complex detection system.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Light is used as an intermediary to detect substrate presence and sagging state. The light transmitting units emit light that passes through the substrate to the light receiving units. By measuring light transmission characteristics, the system indirectly detects substrate conditions without physical contact, preventing damage while achieving accurate detection.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If separate detection systems are used for substrate presence and sagging detection, then comprehensive detection is achieved, but installation space and costs increase

Engineering Contradiction:

Improvesubstrate state detection accuracyVSAvoiddetection system integration

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

Multiple detection functions (substrate presence detection and sagging state detection) are merged into a single integrated sensor system. The first and second light transmitting units with their corresponding light receiving units work together in one sensor assembly, eliminating the need for separate detection systems and reducing installation space and costs.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The sensor system is designed with multi-functionality to perform both substrate presence detection and sagging state detection. By making the detection system universal, it can handle multiple detection tasks simultaneously, reducing the overall number of components needed and simplifying the installation process.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Area of moving object

If light transmitting and receiving units are positioned far from the substrate, then detection coverage is increased, but detection precision decreases

Engineering Contradiction:

Improvedetection coverage areaVSAvoidsagging detection accuracy

Core Design Contradiction:

Area of moving objectVSMeasurement precision

Solution Approach 1:

Different regions of the substrate are detected with different levels of precision by positioning light units at specific locations. The first light unit pair detects substrate presence with broader coverage, while the second light unit pair is positioned to specifically detect sagging states with higher precision in critical areas. This local quality approach optimizes both coverage and precision.

Inventive Principle:

Principle #3Local quality

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 sensor effectively detects substrate presence and sagging, preventing damage and optimizing substrate loading, reducing installation space and costs by integrating detection functions into a single unit.

Implementation Method 1

A light source of the light transmitting unit may be infrared

Methodology Applied

Scientific EffectInfrared radiation: Infrared Radiation

Implementation Method 2

A light receiving element of the light receiving unit may be a photodiode

Methodology Applied

Scientific EffectPhotoelectric effect: Photoelectric Effect

Data Source

PatentUS20250391685A1Substrate mapping sensor and electronic device

Publication Date: 2025.12.25 SAMSUNG DISPLAY CO LTD

AI summary

A substrate mapping sensor detects a state of a substrate located in a channel within a cassette and includes a light transmitting unit located on a side of the cassette and a light receiving unit located on another side of the cassette. The light transmitting unit includes a first light transmitting unit and a second light transmitting unit, which are a pair and located on a side of the channel, the light receiving unit includes a first light receiving unit and a second light receiving unit, which are a pair and located on another side of the channel, the first light transmitting unit and the first light receiving unit detect a presence or an absence of the substrate in the channel, and the second light transmitting unit and the second light receiving unit detect a sagging state of the substrate in the channel.