Liquid Crystal Display Panel Gate Line Routing for Narrow Frame Area
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In liquid crystal display panels, particularly those using the fringe field switching (FFS) mode, it is challenging to narrow the frame area around the display area while preventing display abnormalities caused by capacitive coupling between routing lines and signal lines, which leads to point defect failures and reduced display quality.
Innovation Solution
The design includes an array substrate with second gate lines that are electrically connected to first gate lines outside the display area, allowing for the supply of gate and source signals from one side, reducing stray capacitance, and overlapping second gate lines with source lines to minimize the influence of gate signals on source signals, thereby narrowing the frame area and suppressing display abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If routing lines are disposed in the display area to narrow the frame area, then the frame area is reduced, but display abnormalities occur due to capacitive coupling between routing lines and source lines
Solution Approach 1:
A shielding line is introduced as an intermediary element between the routing line and the source line. This shielding line acts as a mediator that blocks or reduces the capacitive coupling effect between the routing line and source line, thereby preventing display abnormalities while allowing the routing line to be disposed in the display area for frame area reduction
Solution Approach 2:
The harmful capacitive coupling effect is extracted and isolated by introducing the shielding line. The shielding line separates the routing line and source line, removing the direct capacitive interaction that causes display abnormalities while maintaining the compact layout
2Area of stationary object
If routing lines are disposed in the display area, then the frame area is narrowed, but point defect failures occur due to capacitive coupling
Solution Approach 1:
The shielding line serves as a protective intermediary between the routing line and source line, blocking the harmful capacitive coupling that would otherwise cause point defect failures. This allows the routing line to be positioned in the display area without introducing defects
3Reliability
If second gate lines overlap source lines, then the influence of gate signals on source signals is minimized, but routing complexity increases
Solution Approach 1:
The solution moves from planar routing to three-dimensional layering by disposing second gate lines and source lines in different thickness directions. This vertical separation in the thickness direction allows the lines to overlap in plan view while maintaining electrical isolation, reducing signal interference without requiring complex lateral routing
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
This configuration effectively narrows the frame area around the display area, reduces display abnormalities, and enhances the design flexibility and display quality of the liquid crystal display panel by minimizing the impact of gate signals on source signals.
Implementation Method 1
a fringe electric field constituted by an oblique electric field having both transverse and longitudinal electric field components is applied to a liquid crystal layer
Implementation Method 2
The liquid crystal display device displays an image using physical properties of liquid crystals
Implementation Method 3
the pixel electrode and the common electrode face each other with the insulating film interposed therebetween, and are disposed apart from each other in the thickness direction of the array substrate
Data Source
AI summary
First and second gate lines respectively extend in first and second directions in a display area. The second gate line is electrically connected to the first gate line and extends in the second direction in the display area. The second gate line is electrically connected to the first gate line outside the display area. A conductive layer may be disposed between the second gate line and a source line, and the second gate line may be electrically connected to the first gate line in the display area. To the conductive layer, a potential identical to a common potential or a ground potential is applied. An arrangement where two or more second gate lines overlap the source line may be employed. Transition of a potential of a gate signal from an on potential to an off potential may be made in two or more stages.