Display Panel Shielding Layer for Thin-Wire ESD Protection
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Solution Overview
Problem
The increasing density and thinness of metal wires in display devices lead to reduced electrostatic discharge (ESD) protection capabilities, making them susceptible to damage from static electricity accumulation and discharge during manufacturing and panel assembly processes.
Innovation Solution
Incorporating an electrical shielding layer with a transparent conductive material, such as ITO or IZO, and an organic conductive material, on the outer surface of the display device substrate to enhance electrostatic dissipation and prevent circuit damage from static electricity discharges, while also using a high resistance electrostatic preventing layer to manage static electricity generated during touch operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the metal wires are made thinner and denser to increase resolution, then the display resolution is improved, but the electrostatic discharge protection capability deteriorates
Solution Approach 1:
The patent divides the electrostatic protection function into two separate layers: a high impedance electrostatic film on the color resist layer for initial static electricity dissipation, and a low impedance electrical shielding layer on the TFT substrate for enhanced protection. This segmentation allows each layer to perform its specific function optimally without interfering with the thin, dense metal wire design.
Solution Approach 2:
The patent introduces an electrical shielding layer as an intermediary component between the external environment and the sensitive thin film transistor circuit. This shielding layer acts as a mediator that captures and dissipates static electricity before it can reach and damage the thin metal wires, thereby protecting the high-resolution display structure.
2Reliability
If the resistance of the electrostatic film is increased to reduce current leakage, then the electrostatic protection is improved, but static electricity accumulation worsens
Solution Approach 1:
The patent applies different electrical resistance characteristics to different locations and layers: the electrostatic film on the color resist layer has high impedance (5×10^8Ω to 9×10^9Ω) for localized static electricity management, while the electrical shielding layer on the TFT substrate has low impedance (≤1000Ω) for effective static electricity dissipation. This local quality differentiation resolves the contradiction between protection and accumulation.
Solution Approach 2:
The patent creates a composite electrostatic protection system combining two materials with opposite electrical resistance characteristics. The high impedance electrostatic film and low impedance electrical shielding layer work together in a composite structure, where each material's properties are optimized for its specific function, achieving both protection and prevention of static electricity accumulation.
3Ease of manufacture
If the electrostatic protection circuit is simplified to reduce complexity, then the manufacturing process is improved, but the electrostatic protection capability deteriorates
Solution Approach 1:
The patent replaces complex electrostatic protection circuits with passive electrostatic films and shielding layers that function through material properties rather than active circuitry. The electrostatic film and shielding layer provide automatic static electricity dissipation based on their impedance characteristics, eliminating the need for complex protection circuits and simplifying manufacturing while maintaining or enhancing protection capability.
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 electrical shielding layer effectively reduces static electricity accumulation and discharge risks, improving the reliability and yield of display devices by preventing circuit damage and minimizing image defects caused by non-uniform backlight issues.
Implementation Method 1
an electrical shielding layer, disposed on the first outer surface... the resistance of the electrical shielding layer is equal to or smaller than 1000Ω
Implementation Method 2
a high resistance electrostatic preventing layer, disposed on the second outer surface... a resistance of the high resistance electrostatic preventing layer is larger than a resistance of the electrical shielding layer
Data Source
AI summary
The present invention relates to a display device, comprising: a first substrate comprising a first inner surface, a first outer surface opposite to the first inner surface, a display region, a bonding region adjacent to the display region, a plurality of thin film transistors disposed on the first inner surface and corresponding to the display region; a second substrate opposite to the display region and comprising a second inner surface, a second outer surface opposite to the second inner surface, a first color resist and a second color resist each disposed on the second inner surface; a display molecular layer disposed between the first substrate and the second substrate; an electrical shielding layer disposed on the first outer surface of the first substrate, wherein the electrical shielding layer comprises a first shielding region corresponding to the first color resist and a second shielding region corresponding to the bonding region.