Orthogonal Micro Slits in Pixel Electrodes for MVA LCDs
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Solution Overview
Problem
Liquid crystal display devices in MVA mode face challenges with low aperture ratio, reduced light transmittance, and alignment instability due to the presence of protrusions and slits in the pixel area, leading to issues with viewing angle characteristics and brightness.
Innovation Solution
A liquid crystal display device design that includes a pixel electrode with a direct coupling part, a capacitive coupling part, and a space between them, where the micro slits in the adjacent direct and capacitive coupling parts are orthogonal, and the space is linear and has a width similar to the micro slit, with the direct and capacitive coupling parts having split areas and a control capacitance electrode disposed along the border, ensuring stable alignment and high light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a linear protrusion and main slit are formed in the pixel area to regulate liquid crystal alignment, then viewing angle is improved, but aperture ratio and light transmittance are reduced
Solution Approach 1:
The patent extracts the alignment regulating function from the pixel area by placing the linear protrusion and main slit in the non-pixel area (black matrix region). This allows the pixel area to be fully utilized for light transmission while the alignment regulation function is maintained by the electrode structure in the non-pixel area, thereby resolving the contradiction between viewing angle improvement and aperture ratio maintenance.
2Area of stationary object
If a micro slit is formed in the pixel electrode to control alignment without protrusions, then aperture ratio is improved, but alignment control strength is weakened and response time increases
Solution Approach 1:
The patent combines multiple alignment control mechanisms: the micro slit in the pixel electrode provides basic alignment control, while the oblique electric field generated by the linear protrusion and main slit in the non-pixel area provides additional alignment regulation. This merged approach maintains strong alignment control and fast response time while preserving high aperture ratio.
3Stability of the object's composition
If polymerizable monomers are added to liquid crystals for sustained alignment, then alignment stability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent uses the electrode structure (linear protrusion and main slit) as an intermediary to provide alignment regulation through oblique electric fields. This physical intermediary approach achieves alignment stability without requiring chemical modifications to the liquid crystal mixture, thereby avoiding the manufacturing complexity associated with polymerizable monomers while maintaining alignment stability.
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 design achieves excellent viewing angle characteristics and high brightness by stabilizing the alignment of liquid crystals and minimizing dark lines, thereby improving light transmittance and reducing color shifts.
Implementation Method 1
polymerizable monomers are mixed in liquid crystals to polymerize the monomers in the state in which voltage is applied to the liquid crystals
Implementation Method 2
The alignment orientation of the liquid crystals molecules 108 is controlled by an oblique electric field at the end of the pixel electrode 116
Implementation Method 3
in a liquid crystal display device in the VA mode in which the birefringence property of the liquid crystals vertically aligned is used for switching light
Data Source
AI summary
The technology presented herein has a feature of providing a liquid crystal display device of an excellent viewing angle characteristic and high brightness, including: liquid crystals containing polymerizable monomers between a first substrate with a pixel electrode having micro slits and a second substrate facing the first substrate; wherein the monomers are polymerizable with voltage applied to the liquid crystals; and an alignment orientation of the liquid crystals is controllable to a direction of extending the micro slit, wherein the pixel electrode includes: a direct coupling part electrically connected to a switching element; a capacitive coupling part electrically insulated from the switching element, and a space between the direct and capacitive coupling parts, wherein directions in which the micro slits are extended along the direct and capacitive coupling parts are orthogonal to each other.