Fringe Field Switching LCD Pixel Electrode Asymmetric Angles
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Solution Overview
Problem
Fringe field switching type liquid crystal displays suffer from display stains when external pressure is applied due to the collapse of liquid crystal posture, caused by a reduced electrode angle that results in insufficient torque to maintain orientation against external forces.
Innovation Solution
The liquid crystal display is designed with a pixel area divided into two domains, featuring a larger second electrode angle at the domain border area, achieved by a border link pattern connecting the finger portions of the pixel electrode, which increases the torque and prevents collapse under external pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the electrode angle is reduced to less than 15 degrees to decrease driving voltage and increase brightness, then the driving voltage decreases and brightness increases, but the liquid crystal cannot maintain its original posture under external pressure, causing display stains
Solution Approach 1:
The pixel electrode is designed with different electrode angles in different regions: the first electrode angle (less than 15 degrees) is applied in the first domain area to reduce driving voltage and increase brightness, while the second electrode angle (15 degrees or more) is applied in the second domain area including the domain border area to provide sufficient torque and prevent display stains under external pressure. This local differentiation resolves the contradiction by optimizing each region for its specific function.
2Illumination intensity
If the electrode angle is reduced to less than 15 degrees to increase brightness, then the brightness increases, but the torque of liquid crystal becomes insufficient to maintain orientation against external force
Solution Approach 1:
The electrode angle is locally optimized: in the first domain area, a smaller electrode angle (less than 15 degrees) is used to maximize brightness and reduce driving voltage, while in the second domain area at the domain border, a larger electrode angle (15 degrees or more) is used to generate sufficient torque. This spatial differentiation allows the system to achieve high brightness where needed while maintaining structural stability at critical boundaries.
3Power
If the pixel electrode is bent at the domain borderline to create equal electrode angles in both domains, then the liquid crystal movement angle increases and driving voltage decreases, but display stains occur under external pressure
Solution Approach 1:
The pixel electrode is designed with asymmetric electrode angles: the first electrode angle in the first domain area is less than 15 degrees, while the second electrode angle in the second domain area is 15 degrees or more. This asymmetric design breaks the symmetry of conventional bent pixel electrodes, allowing the domain border area to have enhanced torque capability while maintaining the power efficiency benefits in the first domain area.
Solution Approach 2:
Different electrode angle parameters are applied to different spatial regions: the first domain area uses a smaller electrode angle for power efficiency, while the second domain area (particularly the domain border) uses a larger electrode angle for structural stability. This local quality differentiation resolves the contradiction between power consumption and reliability under external pressure.
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 design effectively prevents display stains by enhancing the torque of liquid crystals at the domain border, maintaining their original orientation under external pressure while reducing driving voltage and increasing brightness.
Implementation Method 1
a pixel electrode 16 provided at a pixel area P defined by the crossing structure of the data and gate lines DL and GL and connected to the TFT, a common electrode 2 provided at the pixel area P to form a fringe field together with the pixel electrode 16
Implementation Method 2
a liquid crystal display (LCD) controls light transmittance of liquid crystal material using an electric field to display a picture
Data Source
AI summary
A liquid crystal display of a fringe field switching type is disclosed which can prevent generation of display stains upon application of an external pressure. The liquid crystal display of a fringe field switching type includes: a gate line; a data line; a TFT connected to the gate line and the data line; a pixel electrode connected to the TFT to receive a data signal; a common line for supplying a common voltage; and a common electrode electrically connected to the common line and formed in a plate shape, wherein the domains are vertically symmetrical with respect to a domain border area, and the pixel electrode includes a plurality of finger portions spaced apart from one another by a predetermined gap to form a fringe field together with the common electrode and a border link pattern connecting the finger portions at the domain border area.