Display Substrate Testing Member for Misalignment Detection

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Solution Overview

Problem

Variations in pattern width during the photoresist process in display substrate manufacturing lead to short circuits or disconnection issues, increasing testing time and defect rates, especially in multi-layered structures due to misalignment.

Innovation Solution

Incorporating a testing member with conductive line, electrode, and semiconductor layer testing portions on the display substrate, allowing for easy measurement of pattern widths and misalignment detection, thereby facilitating quick identification and correction of manufacturing issues.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If pattern width is reduced to increase device density, then productivity is improved, but manufacturing precision deteriorates due to photoresist process variations causing disconnection

Engineering Contradiction:

Improvedevice densityVSAvoidpattern width control

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent forms testing portions (conductive line testing portion, electrode testing portion, semiconductor layer testing portion) in advance during the manufacturing process. These testing portions are created at specific stages (conductive layer formation, electrode formation, semiconductor layer formation) to enable preliminary detection of pattern width issues before final device assembly, allowing early intervention to prevent disconnection defects

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent creates simplified copies of the actual device structures as testing portions. These testing portions replicate the critical dimensions and materials of the functional patterns (conductive lines, electrodes, semiconductor layers) but are designed specifically for easy measurement and testing, enabling quality control without interfering with the main device functionality

Inventive Principle:

Principle #26Copying

2Manufacturing precision

If comprehensive testing is performed to detect misalignment, then manufacturing precision is improved, but loss of time increases due to lengthy analysis requirements

Engineering Contradiction:

Improvemisalignment detection accuracyVSAvoidtesting time

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The patent extracts the testing function from the main device structure by creating separate, dedicated testing portions. These testing portions are spatially separated from the functional device areas and are designed specifically for measurement purposes. This extraction allows quick, focused measurement of critical dimensions (conductive line width, electrode width, layer alignment) without the need for complex analysis of the entire device structure

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces complex mechanical measurement systems with simplified optical or visual measurement methods. The testing portions are designed with features that are easily measurable using standard optical microscopy or imaging techniques, eliminating the need for time-consuming sophisticated measurement equipment and complex analysis procedures

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If pattern width is increased to prevent disconnection, then reliability is improved, but productivity deteriorates due to increased spacing requirements

Engineering Contradiction:

Improveconnection integrityVSAvoiddevice density

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent performs preliminary testing of pattern widths using the dedicated testing portions formed during manufacturing. By measuring the actual widths of conductive lines, electrodes, and semiconductor layers at various stages, the process can identify patterns that are too narrow before final device assembly. This allows selective rework or adjustment of specific problematic areas rather than increasing all pattern dimensions, thereby maintaining high device density while ensuring connection reliability

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS8018542B2Display substrate for easy detection of pattern misalignment

Publication Date: 2011.09.13 LONESTAR CRYSTAL DISPLAY LLC

AI summary

A display substrate includes a base substrate, a conductive line on the base substrate, a switching element and a testing member. The switching element includes a first electrode formed on the semiconductor layer pattern and electrically connected to the conductive line, and a second electrode spaced apart from the first electrode and semiconductor layer pattern. The testing member includes a conductive line testing portion that is formed from the same layer as the conductive line and an electrode testing portion that is formed from the same layer as the first electrode. The conductive line testing portion and the electrode testing portion have substantially the same width as the conductive line and the first electrode, respectively. The testing member also includes a semiconductor layer testing portion. The display substrate lends itself to efficient manufacturing with reduced process time and cost.