Color Filter Substrate Isolation Band for Static Electricity Management
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Solution Overview
Problem
In display devices, particularly in LCD panels, the ITO thin film on the color filter substrate is susceptible to mechanical damage and external static electricity can enter through it, leading to electrostatic discharge and damage, which existing methods fail to adequately address.
Innovation Solution
A color filter substrate with a conductive layer and an isolation band that extends to the edge of the substrate, using a black matrix with conductive properties to isolate external static electricity and prevent mechanical damage, while simplifying the manufacturing process and improving transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an ITO thin film is manufactured on the backside of the CF substrate to release static electricity, then static electricity can be discharged, but the ITO thin film is susceptible to mechanical damage and external static electricity may enter through it
Solution Approach 1:
The patent changes the material parameter from ITO thin film to black matrix material, which has both conductive properties and mechanical strength. The black matrix is doped with conductive materials to achieve the required electrical conductivity while maintaining structural integrity and resistance to mechanical damage.
Solution Approach 2:
The patent creates a composite structure by doping the black matrix with conductive materials such as carbon black, carbon nanotubes, graphite, or metal powder. This composite approach combines the mechanical strength of the black matrix with the electrical conductivity of the dopant, resolving the contradiction between mechanical strength and static electricity discharge capability.
2Reliability
If an ITO thin film is manufactured on the backside of the CF substrate, then static electricity can be released, but external static electricity may enter the display device through the ITO thin film to cause static electricity accumulation
Solution Approach 1:
The patent segments the conductive layer into two functional zones: the black matrix region that provides mechanical strength and internal static electricity discharge, and the isolated conductive layer region that prevents external static electricity intrusion. The isolation band creates a clear boundary between these zones, allowing each to perform its specific function.
Solution Approach 2:
The patent applies different properties to different regions: the black matrix region has high mechanical strength and conductive properties for internal static electricity management, while the isolated conductive layer region has conductive properties with electrical isolation from the edge to prevent external static electricity entry. Each region is optimized for its specific function.
3Reliability
If a conductive layer is added to the CF substrate to prevent static electricity accumulation, then ESD damage is prevented, but the manufacturing process becomes more complex
Solution Approach 1:
The patent merges the black matrix structure with the conductive layer function. Instead of adding a separate conductive layer, the black matrix itself is doped with conductive materials, combining the structural element (black matrix) with the functional element (conductive layer) into a single integrated component, thereby simplifying the manufacturing process.
Solution Approach 2:
The black matrix is given multiple functions: it serves as the structural framework for the color filter substrate, provides light shielding, and simultaneously acts as the conductive layer for static electricity discharge when doped with conductive materials. This multi-functionality eliminates the need for separate conductive layer manufacturing steps.
4Reliability
If an ITO thin film is used on the CF substrate, then static electricity can be discharged, but transmittance of the display device is reduced
Solution Approach 1:
The patent changes the material from ITO thin film to black matrix material, which has superior optical properties. The black matrix, when doped with conductive materials, maintains the required electrical conductivity while having minimal impact on display transmittance, especially in the non-display regions where the black matrix is located.
Data Source
AI summary
The present disclosure relates to a color filter substrate, a display panel and a display device. The color filter substrate includes a conductive layer located at a side of the color filter substrate where a color filter is located, a peripheral region of the conductive layer is provided with an isolation band configured to isolate external static electricity, the isolation band is provided with a breach, an inside portion of the conductive layer located inside the isolation band is provided with an extending portion configured to export static electricity, and the extending portion is extending to an edge of the color filter substrate through the breach.