Liquid Crystal Display Charge Elimination Pad Configuration
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in efficiently managing static electricity during fabrication, which can lead to electrostatic discharge and damage to the circuit, particularly in the active area and signal wiring, due to the lack of effective charge elimination and power supply pad configurations.
Innovation Solution
The liquid crystal display device incorporates a specific configuration with charge elimination and power supply pads, along with connection wiring lines and shield electrodes, to induce discharge and consume static electricity, preventing undesired electrification and electrostatic discharge. This configuration includes pads with defined distances and connection wiring lines to facilitate the discharge of static electricity to ground or common potential, thereby suppressing secondary discharges and protecting the circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pad configurations are used without dedicated charge elimination pads, then the device structure remains simple, but static electricity accumulates and causes electrostatic discharge damaging the circuit
Solution Approach 1:
A charge elimination pad is introduced as an intermediary component between the signal wiring and ground. This pad serves as a dedicated intermediary path to safely discharge static electricity, preventing direct discharge damage to the circuit while maintaining a relatively simple overall structure through its isolated placement.
Solution Approach 2:
The charge elimination function is extracted from the general pad structure and implemented as a dedicated charge elimination pad. By separating this protective function into an independent component, the patent prevents static electricity from affecting the signal wiring while maintaining clear functional differentiation in the device structure.
2Productivity
If charge elimination pads are placed close to signal wiring, then charge discharge efficiency improves, but risk of unintended discharge to signal wiring increases
Solution Approach 1:
The patent applies local quality by creating a dedicated charge elimination pad with specific electrical characteristics (connected to ground) positioned near the signal wiring. This localized structure provides efficient charge discharge while the dedicated nature of the pad ensures that discharge occurs to ground rather than to the signal wiring, preventing harmful effects.
Solution Approach 2:
The patent converts the potentially harmful static electricity into a beneficial controlled discharge by providing a dedicated path to ground. The charge elimination pad transforms the harmful accumulation of static charge into a controlled, safe discharge process that protects the circuit rather than damaging it.
3Area of stationary object
If multiple pads are placed close together, then device area is reduced, but electrostatic interference between pads increases
Solution Approach 1:
The patent segments the pad functions into distinct, isolated regions - a charge elimination pad connected to ground and a power supply pad connected to the power source. By segmenting these functions into separate physical locations even though they are close together, the patent maintains compact area while preventing electrostatic interference between the different pad types.
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 described configuration effectively suppresses static electricity discharge, preventing circuit damage and improving manufacturing yield by ensuring that static electricity is consumed and not discharged to unintended wiring or pads, thus maintaining the integrity of the liquid crystal display device.
Implementation Method 1
induce discharge and consume static electricity, preventing undesired electrification and electrostatic discharge
Implementation Method 2
liquid crystal molecules are switched by a lateral electric field which is substantially parallel to a major surface of the array substrate
Implementation Method 3
makes use of a lateral electric field (including a fringe electric field)
Data Source
AI summary
According to one embodiment, a liquid crystal display device includes a first substrate including a first area, a second area located around the first area, and a third area neighboring the second area, the first area including a pixel electrode including a strip-shaped main pixel electrode, the second area including a power supply pad, and the third area including a charge elimination pad, a first pad electrically connected to the charge elimination pad, a second pad neighboring the first pad at a first pad distance and electrically connected to the power supply pad, and a third pad neighboring the second pad at a second pad distance greater than the first pad distance.