Liquid Crystal Display Panel Multi-Domain Layout Photo Alignment
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Solution Overview
Problem
The existing methods for creating a multi-domain layout in liquid crystal display panels, such as MVA and PVA, require additional photo masks and electrode patterns, increasing costs and decreasing yield rates.
Innovation Solution
A photo alignment technique is used to align layers along columns and rows, dividing each pixel unit into domains with specific tilt directions for adjacent pixel units, reducing the number of dark lines at boundaries and improving transmittance and yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If protrusions or predetermined electrode patterns are used to form multi-domain layout, then viewing angle is improved, but manufacturing cost increases and yield rate decreases
Solution Approach 1:
The patent extracts and removes the protrusion structures from the conventional MVA method, replacing them with a planar electrode configuration. This eliminates the need for additional photo masks while maintaining multi-domain functionality through oblique electric fields generated by patterned electrodes.
Solution Approach 2:
The patent merges the alignment layer patterning function with the electrode pattern design. By integrating the alignment layer orientation control directly into the electrode configuration, the method eliminates separate photo mask steps for alignment layer patterning, reducing manufacturing complexity.
2Adaptability or versatility
If protrusions or predetermined electrode patterns are used to form multi-domain layout, then viewing angle is improved, but productivity decreases
Solution Approach 1:
The patent removes the protrusion formation step entirely, replacing it with a planar structure that can be manufactured using standard thin-film deposition techniques without requiring additional photo mask alignment steps, thereby improving yield rate.
Solution Approach 2:
The patent uses the electrode pattern itself as the template for alignment layer orientation, eliminating the need for separate alignment layer photo masks. This copying approach reduces the number of photolithography steps and improves manufacturing efficiency.
3Object-affected harmful factors
If conventional multi-domain methods are used, then dark lines are reduced, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the protrusion structures that complicate the device geometry, replacing them with planar electrodes that maintain multi-domain functionality through electric field manipulation rather than physical structure.
Solution Approach 2:
The patent replaces the mechanical/protrusion-based domain separation method with an electric field-based approach. Instead of using physical protrusions to create domains, the patent uses oblique electric fields generated by patterned electrodes to achieve the same multi-domain effect with simpler 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
The photo alignment technique achieves a multi-domain layout with reduced dark lines and improved transmittance and yield, while maintaining similar optical performance to traditional methods.
Implementation Method 1
the invention applies a photo alignment technique to achieve the multi-domain layout
Data Source
AI summary
The invention provides a liquid crystal display panel with a multi-domain pixel layout, including: a plurality of pixel units arranged in a matrix formed by columns and rows, wherein each pixel unit is divided into a plurality of domains; a first alignment layer aligned to directions along the columns; and a second alignment layer aligned to directions along the rows. For two adjacent pixel units arranged in the column direction, the domains adjacent to a boundary between the two adjacent pixel units are defined with the same directions which liquid crystal molecules tilt toward by the first and second alignment layers.