PSVA Liquid Crystal Alignment via Edge Electrode Voltage Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing PSVA liquid crystal display manufacturing process faces challenges in achieving satisfactory alignment of liquid crystal molecules, leading to poor tilt direction and resulting in issues like dark lines and non-uniform brightness, which affect the display efficiency and quality.
Innovation Solution
A method involving specific voltage applications to thin film transistors and common electrodes, along with a unique pixel electrode structure, is used to align liquid crystal molecules at predefined angles, ensuring a more satisfactory alignment and curing with energy light, such as ultraviolet, to improve the pre-tilt angle processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional voltage application method is used during liquid crystal alignment, then the alignment process is simple, but the liquid crystal molecules at edge regions cannot be properly aligned resulting in dark lines and non-uniform brightness
Solution Approach 1:
The patent applies different voltage conditions to different regions of the liquid crystal display device. Specifically, the edge regions receive a different voltage configuration compared to the center regions, allowing optimized alignment control for each zone. This local differentiation resolves the alignment precision issue at edges without requiring complete redesign of the entire voltage system.
Solution Approach 2:
The voltage application system is segmented into multiple independent control channels: a first voltage applied to pixel electrodes, a second voltage to common electrodes, and a third voltage to edge electrodes. This segmentation allows independent optimization of alignment conditions in different regions, particularly enabling improved control over edge region liquid crystal molecules to eliminate dark lines.
2Manufacturing precision
If multiple voltage signals are applied to different electrodes, then liquid crystal alignment at edges is improved, but the control system becomes more complex
Solution Approach 1:
The patent implements preliminary alignment control by applying specific voltage sequences before the main liquid crystal alignment process. The edge electrode voltage is applied in advance to prepare the electric field configuration, ensuring that when the main alignment voltage is applied, the liquid crystal molecules at edges are already in the correct orientation state, thus improving tilt direction accuracy.
Solution Approach 2:
The patent introduces edge electrodes as intermediary elements between the pixel electrodes and common electrodes. These edge electrodes serve as mediators that create a transitional electric field zone, facilitating smoother and more accurate liquid crystal alignment at the edges without requiring direct complex control of the main electrode system.
3Manufacturing precision
If edge electrode voltage is added to improve alignment, then dark lines are reduced, but the device structure becomes more complex
Solution Approach 1:
Edge electrodes are introduced only at the peripheral regions of the liquid crystal display device where alignment problems occur, rather than throughout the entire device. This localized addition provides the necessary electric field control for uniform alignment at edges without significantly increasing the overall device complexity or affecting the main display area structure.
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 method significantly reduces discontinuous lines and dark lines, enhancing the display efficiency and reducing non-uniform brightness, resulting in improved display effects for the LCD.
Implementation Method 1
applying a second voltage to the source of the thin film transistor corresponding to each pixel unit, and applying a third voltage to a color filter side common electrode and an array side common electrode, so as to generate an alternating current voltage difference between the source and the color filter side common electrode during alignment of liquid crystal molecules
Implementation Method 2
curing the liquid crystal molecules arranged according to the predefined direction angles by adopting energy light
Data Source
AI summary
The present disclosure discloses a method for aligning liquid crystals of a PSVA liquid crystal display device, including the steps of: providing a first voltage to a gate of a thin film transistor for enabling it in a turn-on state; applying a second voltage to the source of the thin film transistor, and applying a third voltage to a color filter side common electrode and an array side common electrode, so as to generate an alternating current voltage difference between the source and the color filter side common electrode, and enable the liquid crystal molecules to be arranged according to predefined direction angles; curing the liquid crystal molecules. The method may enable the alignment of the liquid crystal molecules to be ideal, which is advantageous to the subsequent process of tilt angles, so as to enhance the efficiency and effect of the liquid crystal display.