LCD Panel Light-Shielding Pattern for Leakage and ESD
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Solution Overview
Problem
Conventional LCD panels experience light leakage and electro-static discharge (ESD) due to floating metals used for light shielding, which affect display quality and signal consistency.
Innovation Solution
A light-shielding pattern traversing scan lines and data lines is disposed at the periphery of the LCD panel, electrically insulated from these lines and connected to a ground terminal or common lines to prevent light leakage and ESD, while also adjusting capacitance coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If floating metals are used for light shielding at the periphery of the LCD panel, then light leakage is prevented, but electro-static discharge (ESD) occurs and signal consistency deteriorates
Solution Approach 1:
The patent extracts the harmful floating metal structures from the periphery region and replaces them with a ground-connected light-shielding pattern. This removes the source of ESD while maintaining the light-shielding function, thus resolving the contradiction between preventing light leakage and maintaining signal consistency
Solution Approach 2:
The patent introduces a ground terminal as an intermediary element. The light-shielding pattern is electrically connected to the ground terminal through a ground line, which acts as a mediator to provide a safe discharge path for electrostatic charges while maintaining the light-shielding effect. This intermediary connection prevents ESD from affecting the signal lines
2Object-affected harmful factors
If floating metals are disposed under the sealant for light shielding, then light leakage at the periphery is prevented, but capacitance coupling causes ESD damage
Solution Approach 1:
Instead of using floating metals that accumulate static charge, the patent inverts the approach by using a ground-connected structure. The light-shielding pattern is deliberately connected to ground potential, which inverts the electrical state from floating (charge-accelerating) to grounded (charge-dissipating), thereby preventing ESD damage while maintaining light shielding
Solution Approach 2:
The patent converts the potentially harmful capacitance coupling effect into a beneficial grounding mechanism. By connecting the light-shielding pattern to ground, the capacitance coupling that would otherwise cause ESD is transformed into a safe charge dissipation path, turning the harmful electrostatic effect into a protective grounding function
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 solution effectively prevents light leakage and reduces ESD damage, improving display quality and signal consistency by using a light-shielding pattern that is electrically connected to common lines or a ground terminal to manage capacitance coupling.
Implementation Method 1
a light-shielding pattern traversing scan lines and data lines is disposed at the periphery of the LCD panel so as to prevent light leakage at the periphery of the LCD panel
Implementation Method 2
the sealant 140 is formed by an ultraviolet curing adhesive, thus, the sealant 140 can only bond and fix the TFT array substrate 110 and the color filter substrate 120 after it is radiated and hardened by an ultraviolet light
Data Source
AI summary
A liquid crystal display (LCD) panel including a thin film transistor (TFT) array substrate, a color filter substrate, a sealant, and a liquid crystal layer is provided. The TFT array substrate includes a substrate, a plurality of pixel structures, a plurality of scan lines, a plurality of data lines, and a light-shielding pattern. The scan lines and data lines are disposed on the substrate for controlling the operation of the pixel structures. The light-shielding pattern arranged on the periphery of the panel traverses the scan lines and data lines and is electrically insulated from the scan lines and data lines. The sealant is sandwiched between the TFT array substrate and the color filter substrate and is corresponding to the light-shielding pattern. The liquid crystal layer is disposed between the TFT array substrate, the color filter substrate, and the sealant.