Conductive Film for Display Substrate Electrostatic Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Miniaturization of switching elements in display devices leads to increased susceptibility to electrostatic destruction during manufacturing, as the components with small capacitance are prone to damage from electrostatic discharge caused by electrostatic charging of insulating substrates during processing.
Innovation Solution
A conductive film, preferably made of nitride, is formed on the insulating substrate to equalize the etching rate with the substrate, preventing electrostatic discharge by dispersing electrostatic energy and ensuring the conductive film is removed after switching element formation and before polishing, thus avoiding damage to the switching elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If switching elements are miniaturized to achieve high-definition display, then display resolution is improved, but susceptibility to electrostatic destruction increases
Solution Approach 1:
A conductive film is formed on the insulating substrate before forming the switching elements. This preliminary conductive layer serves as an electrostatic protection mechanism that disperses electrostatic energy before it can reach and damage the miniaturized switching elements during subsequent manufacturing processes
Solution Approach 2:
The conductive film acts as an intermediary layer between the insulating substrate and the switching elements. It mediates the electrostatic energy by providing a conductive path that dissipates charges, thereby protecting the fragile miniaturized components from electrostatic discharge damage
2Reliability
If a conductive film is formed on the insulating substrate to prevent electrostatic discharge, then electrostatic protection is improved, but process complexity increases due to additional manufacturing steps
Solution Approach 1:
The conductive film formation step is merged with the existing manufacturing process flow. The conductive film is formed using standard sputtering or CVD techniques that are already part of the display device fabrication process, thereby integrating electrostatic protection without requiring entirely new manufacturing equipment or processes
Solution Approach 2:
The conductive film is designed as a temporary protective layer that is discarded after serving its electrostatic protection function. The film is selectively removed after the switching elements are formed, as it is no longer needed and would interfere with subsequent processing steps
3Manufacturing precision
If the conductive film etching rate is matched to the insulating substrate etching rate, then film thickness uniformity is improved, but material selection constraints increase
Solution Approach 1:
The etching rate matching is achieved by adjusting process parameters such as film thickness, composition ratios, and etching conditions rather than being strictly limited to specific material pairs. This allows flexibility in material selection while still achieving the desired etching rate synchronization between the conductive film and insulating substrate
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 conductive film effectively prevents electrostatic destruction of switching elements and maintains even film thickness, enhancing the productivity and quality of display devices, particularly in high-definition liquid crystal display devices with small switching element areas.
Implementation Method 1
The electrostatic energy may sometimes cause electrostatic discharge (ESD) during the manufacturing process which damages the components having capacitance such as switching elements
Implementation Method 2
As to the substrate in an etching process in which a fluoric acid solution containing 10% or more hydrogen fluoride is used
Data Source
AI summary
According to one embodiment, a substrate for display device includes an insulating substrate and a conductive film formed on at least one main surface of the insulating substrate. As to the substrate in an etching process in which a fluoric acid solution containing 10% or more hydrogen fluoride is used, a first etching rate of the conductive film is substantially the same as a second etching rate of the insulating substrate, or the first etching rate is greater than the second etching rate.