LCD Panel Pre-Tilt Grooves and Photomask Exposure
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Solution Overview
Problem
In-plane switching mode liquid crystal display (IPS-LCD) panels face decreased light transmission due to unwanted electric fields generated between adjacent sub-pixel electrodes, causing liquid crystal molecules to deviate from their predetermined orientation.
Innovation Solution
The method involves forming pre-tilt grooves on alignment layers on both substrates and using a photomask to expose the liquid crystal layer, dividing it into portions with different tilt angles to control the electric field and twist angle, thereby improving light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If liquid crystal molecules are arranged along a predetermined orientation by alignment layer in initial state, then display function is achieved, but unwanted electric fields between adjacent sub-pixel electrodes cause liquid crystal molecules to deviate from predetermined orientation, decreasing light transmission
Solution Approach 1:
The patent applies local quality by creating different pre-tilt angles in different regions of the liquid crystal layer. Specifically, liquid crystal molecules in regions corresponding to spaces between adjacent sub-pixel electrodes are given a first pre-tilt angle, while molecules in other regions have a second pre-tilt angle. This localized differentiation allows the alignment layer to counteract the unwanted electric fields in specific areas, thereby improving light transmission without compromising the overall display function.
Solution Approach 2:
The patent implements preliminary action by pre-aligning liquid crystal molecules with specific pre-tilt angles before the display operation begins. The alignment layer is configured to establish these predetermined pre-tilt angles in advance, so that when unwanted electric fields occur during operation, the molecules are already positioned to resist deviation. This preliminary alignment prevents the harmful effects of electric fields rather than correcting them afterward.
2Manufacturing precision
If photomask is used to expose liquid crystal layer and divide it into portions with different tilt angles, then precise alignment is achieved and light transmission is improved, but manufacturing process complexity increases
Solution Approach 1:
The patent uses a photomask as an intermediary tool to achieve precise alignment of liquid crystal molecules. The photomask is positioned between the alignment layer and the liquid crystal layer during the alignment process, allowing selective exposure that creates different pre-tilt angles in different regions. This intermediary device enables high manufacturing precision while keeping the overall process manageable by concentrating the complexity in a single, removable component rather than requiring complex integrated systems.
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 approach ensures precise alignment of liquid crystal molecules, reducing unwanted electric fields and enhancing light transmission by controlling the exposure time and tilt angles, resulting in improved display performance.
Implementation Method 1
an alignment layer in an initial state. When a voltage is applied to form an electric field within the liquid crystal layer, the liquid crystal molecules are twisted
Implementation Method 2
using a photomask to expose the liquid crystal layer, dividing it into portions with different tilt angles
Implementation Method 3
When a voltage is applied to form an electric field within the liquid crystal layer, the liquid crystal molecules are twisted to realize a display function
Data Source
AI summary
A method for manufacturing a liquid crystal display (LCD) panel is disclosed. The LCD panel includes a first alignment layer formed on a first substrate and a second alignment layer formed on a second substrate. A liquid crystal layer having a plurality of liquid crystal molecules between the first alignment layer and the second alignment layer is exposed using a photomask from a side of the second substrate away from the first substrate. Thus, a portion of the liquid crystal molecules are arranged at a first pre-tilt angle and the other portion of the liquid crystal molecules are arranged at a second pre-tilt angle less than the first pre-tilt angle.