Active Matrix Substrate Dual Slit Alignment for LCD Viewing Angle
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Solution Overview
Problem
Conventional MVA-LCD panels face issues with alignment precision between substrates, affecting response time and viewing angles, and can result in image residue due to mis-alignment of alignment patterns like slits and protrusions.
Innovation Solution
An active matrix substrate with two kinds of slits, where the first slits are formed on the pixel electrodes and the second slits are formed on a dielectric layer covering the pixel electrodes, allowing for precise control of liquid crystal alignment without relying on precise substrate alignment, and including a light shielding layer to enhance contrast ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If alignment protrusions and slits are formed on both substrates to create multi-domain liquid crystal distribution, then viewing angle and response time are improved, but substrate alignment precision requirements increase and image residue occurs due to misalignment
Solution Approach 1:
The invention segments the alignment function by placing only slits on the active matrix substrate and removing alignment protrusions from the color filter substrate. This segmentation allows the alignment function to be achieved through a single substrate's slit pattern, eliminating the need for precise alignment between two substrates while still creating multi-domain liquid crystal distribution for improved viewing angle and response time.
Solution Approach 2:
The invention extracts and removes the alignment protrusions from the color filter substrate, retaining only the slits on the active matrix substrate. This extraction eliminates the alignment precision problem between substrates while preserving the multi-domain alignment function, thereby preventing image residue and improving manufacturing precision requirements.
2Device complexity
If alignment protrusions are removed from the color filter substrate, then manufacturing complexity and alignment precision requirements are reduced, but liquid crystal alignment control may be compromised
Solution Approach 1:
The invention applies local quality by designing the pixel electrode with specific slit patterns (first slits and second slits at different positions and orientations) that create localized electric field distributions. These localized field patterns ensure proper liquid crystal alignment control within each pixel region, compensating for the removal of alignment protrusions and maintaining reliable multi-domain alignment without requiring complex structures on both substrates.
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 solution ensures display quality is not affected by substrate alignment precision, improves contrast ratio, and maintains compatibility with current processing methods while enhancing aperture ratio and reducing manufacturing costs.
Implementation Method 1
the pixel electrode 118b includes slits S1... the alignment protrusions P are disposed on the common electrode 126... adapted to align the liquid crystal molecules to form a plurality of domains
Implementation Method 2
including a light shielding layer to enhance contrast ratio
Data Source
AI summary
An active matrix substrate is provided. The active matrix substrate includes a substrate, a plurality of scan lines disposed on the substrate, a plurality of data lines disposed on the substrate, a plurality of pixel units disposed on the substrate and a dielectric layer disposed on the substrate. The pixel units are electrically connected with the corresponding scan lines and data lines. Each pixel unit includes an active device and a pixel electrode electrically connected with the active device, such a pixel electrode includes at least a first slit. The dielectric layer covers the first slit, and the dielectric layer includes a plurality of second slits for exposing a part of each of the pixel electrodes.