LCD Static Electricity Protection via Discharge Electrode
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Solution Overview
Problem
Liquid crystal display devices are prone to defects due to static electricity, which damages gate and data lines, leading to reduced production yield and dim display phenomena.
Innovation Solution
Incorporating a static electricity preventing element and auxiliary electrodes/lines between signal lines and a common line in the non-display area, which guides static electricity to the common line, preventing damage to the signal lines during manufacturing and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transistors are used as static electricity preventing elements connected between signal lines and common line, then static electricity can be guided to common line, but the transistors are not turned on by high AC voltage static electricity at data pad or gate pad, resulting in line damage
Solution Approach 1:
A discharge electrode is introduced as an intermediary component between the signal line and common line. This discharge electrode serves as a dedicated pathway for high AC voltage static electricity to discharge directly to the common line without needing to turn on transistors, thus protecting the signal lines from damage while maintaining normal transistor operation for DC static electricity protection
Solution Approach 2:
The static electricity protection function is segmented into two distinct pathways: one for DC static electricity through transistors connected to the common line, and another for high AC voltage static electricity through the discharge electrode. This segmentation allows each component to be optimized for its specific function, with the discharge electrode handling high AC voltage events that transistors cannot manage
2Productivity
If transistors are positioned to be turned on by high voltage for static electricity prevention, then they can guide DC static electricity to common line, but they remain inactive during high AC voltage static electricity events, allowing damage to occur
Solution Approach 1:
The discharge electrode acts as a specialized intermediary that responds specifically to high AC voltage static electricity events. It provides a direct discharge path that is activated by AC voltage characteristics, complementing the transistor-based protection system and ensuring line integrity during AC voltage events that would otherwise cause damage
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
Effectively blocks static electricity from reaching the gate and data lines, enhancing the production yield and reliability of liquid crystal display devices by preventing line damage and ensuring stable operation.
Implementation Method 1
The static electricity preventing element 8 guides the static electricity flowing into the data line (DL) through the data pad (DP) towards the common line (CL). In addition, the static electricity preventing element 8 connected between the common line (CL) and each gate line guides the static electricity flowing into the gate line (GL) through the gate pad (GP) towards the common line (CL).
Data Source
AI summary
A liquid crystal display device and its fabricating method are discussed. According to an embodiment, the liquid crystal display at least one signal line disposed in a display area and extending to a non-display area located outside the display area, a common line crossing the signal line in the non-display area, at least one static electricity preventing element connected between the common line and the signal line in the non-display area, and at least one static electricity preventing auxiliary electrode projected towards the signal line from the static electricity preventing element in the non-display area.