Liquid Crystal Display Splay to Bend Alignment Transition
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Solution Overview
Problem
Existing liquid crystal display technologies face challenges in transitioning the OCB liquid crystal from splay alignment to bend alignment quickly and efficiently, which is necessary for high-speed response displays, as current methods require significant time and voltage to achieve this transition.
Innovation Solution
The liquid crystal display employs a transition drive method that utilizes a combination of gate lines, signal lines, storage capacitance lines, and pixel switches, along with a controller to apply specific voltage waveforms, including both longitudinal and lateral voltages, to rapidly transition the liquid crystal from splay to bend alignment, utilizing a transition nucleus forming part strategically positioned on the pixel electrode to facilitate this change.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional transition drive methods are used to transition OCB liquid crystal from splay alignment to bend alignment, then the alignment transition can be achieved, but it requires significant time and high voltage, which reduces display responsiveness and increases power consumption
Solution Approach 1:
The patent applies preliminary action by forming a transition nucleus at specific positions (edges or center) of the pixel electrode before the main alignment transition. This nucleus serves as a pre-prepared starting point that accelerates the subsequent transition from splay to bend alignment, eliminating the need for slow conventional transition methods
Solution Approach 2:
The patent applies local quality by creating a transition nucleus with specific local characteristics (different voltage application to edge regions versus center region) rather than uniform voltage across the entire pixel electrode. This localized approach enables faster transition initiation at critical positions, improving overall transition speed while reducing required voltage
2Speed
If high voltage is applied to accelerate the transition from splay to bend alignment, then transition speed improves, but power consumption increases and may damage display components
Solution Approach 1:
The patent applies local quality by applying different voltage levels to different regions of the pixel electrode - higher voltage to edge regions where the transition nucleus is formed, and lower or zero voltage to the center region. This localized high-voltage approach achieves fast transition where needed while minimizing overall power consumption and avoiding component damage from uniformly high voltage
Solution Approach 2:
The patent uses preliminary action to form a transition nucleus that creates a favorable condition for subsequent alignment transition. This pre-prepared nucleus reduces the energy barrier for transition, allowing the main transition phase to proceed at lower voltage levels than would be required without the nucleus, thereby reducing power consumption
3Speed
If transition drive is applied to achieve quick alignment transition, then responsiveness improves, but the complexity of drive circuits and control increases
Solution Approach 1:
The patent applies segmentation by dividing the pixel electrode into distinct regions (edge regions and center region) with different drive waveforms applied to each. This segmentation enables independent optimization of transition behavior in different areas, achieving fast transition through simple regional control rather than complex overall control
Solution Approach 2:
The patent uses preliminary action to form a transition nucleus in advance, which simplifies the subsequent transition control. By preparing the nucleus beforehand with a simple initial voltage pattern, the main transition phase requires only straightforward voltage application, reducing the need for complex real-time control circuits
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 allows for a quick and efficient transition from splay to bend alignment within a short time, using low voltages and minimizing the impact on display aperture ratio, thereby enhancing the display's responsiveness and operational efficiency.
Implementation Method 1
An optically compensated bend (OCB) liquid crystal is known by having a characteristic of high-speed response... in order to make the OCB liquid crystal exhibit the above-mentioned high-speed responsivity, it is necessary to operate the OCB liquid crystal in a state of alignment called bend alignment
Implementation Method 2
a plurality of storage capacitance lines extending along the rows in which the display pixel electrodes are arranged, and configured to superpose a voltage on the pixel electrodes by capacitive coupling
Data Source
AI summary
According to one embodiment, a display includes pixel electrodes arranged in a matrix, gate lines extending along rows, signal lines extending along columns, storage capacitance lines extending along the rows to superpose a voltage on the pixel electrodes, a counterelectrode opposed to the pixel electrodes, a driver to drive the gate lines, the signal lines, and the storage capacitance lines, and a controller to control the driver. The controller sequentially drives the gate lines to write from the signal lines to the pixel electrodes and, after the write to the pixel electrodes, changes a potential of each of the storage capacitance lines to cause alignment of the liquid crystal layer to make a transition from splay alignment to bend alignment.