Display Gate Line Testing Pads for Plastic Substrate Integrity
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Solution Overview
Problem
Display substrates with plastic materials are prone to deformation and line breakage when exposed to external impacts or heat due to the lower elasticity of metal gate and data lines compared to the plastic material, leading to functional failures during manufacturing.
Innovation Solution
Incorporating test pads and contact portions on the display apparatus to allow for electrical connection and testing of gate and data lines before or after each layer is formed, ensuring their functionality and integrity throughout the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal gate lines and data lines are formed on plastic display substrate, then electrical conductivity and signal transmission are improved, but the lines may break when external heat is applied because metal material has less elasticity than plastic material
Solution Approach 1:
The gate line and data line are divided into multiple segments with insulating layers between them, allowing each segment to expand and contract independently when exposed to heat, preventing breakage while maintaining electrical conductivity
Solution Approach 2:
The physical state of the lines is changed by introducing insulating layer patterns that modify the thermal and mechanical properties, allowing the lines to withstand thermal stress without breaking
2Stability of the object's composition
If display substrate includes plastic material for flexibility, then bending capability is improved, but the substrate is easily deformed when heated by external heat source
Solution Approach 1:
Insulating layer patterns are formed beforehand on the substrate to cushion and distribute thermal stress, preventing deformation of the plastic material when exposed to external heat sources
3Manufacturing precision
If test pads and contact portions are added to enable testing of gate and data lines, then manufacturing quality control is improved, but device complexity increases
Solution Approach 1:
The insulating layer patterns serve multiple functions: they provide electrical insulation between adjacent lines and create test access points, allowing the same structure to fulfill both insulation and testing requirements without adding separate components
Data Source
AI summary
In a display apparatus and a method of manufacturing the display apparatus, a gate line, a data line, and a plurality of layers are formed on an array substrate on which a pixel area, a pad area, and a peripheral area are defined. During the forming processes of the gate line, the data line, and the layers, the gate line and the data line are partially exposed in the peripheral area, or contact portions formed on the gate line and the data line in the peripheral area are exposed. Thus, the gate line and the data line may be tested using the contact portions as electrical terminals during the manufacturing process of the display apparatus.