OCB LCD Step Structure for Uniform Splay-to-Bend Transition
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Solution Overview
Problem
The existing OCB mode LCDs require a high voltage to transition liquid crystal molecules from splay alignment to bend alignment, leading to non-uniform and slow transitions, which increases production costs and affects display performance.
Innovation Solution
Incorporating a step structure on the second substrate, which alters the electric field distribution and pre-inclines liquid crystal molecules, allowing them to transition quickly and uniformly from the splay to the bend state when an electric field is applied between the pixel and common electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a high voltage is applied to the liquid crystal layer to accelerate the transition from splay alignment to bend alignment, then the transition speed is improved, but the uniformity of transition and display quality deteriorate
Solution Approach 1:
The step structure is formed on the second substrate before the liquid crystal layer is filled, creating pre-inclined surfaces that guide the liquid crystal molecules into the bend alignment state. This preliminary structural preparation ensures uniform transition without requiring high voltage, as the molecules are already positioned to follow the step structure contours when voltage is applied.
2Loss of time
If a high voltage is applied to quicken the transition of liquid crystal molecules, then the response time is improved, but the display quality and uniformity of transition deteriorate
Solution Approach 1:
The step structure is pre-formed on the second substrate to create favorable initial conditions for molecular alignment. This preliminary action reduces the voltage threshold needed for transition and ensures uniform molecular reorientation throughout the liquid crystal layer, eliminating the need for high voltage pulses that would compromise display quality.
3Illumination intensity
If the liquid crystal molecules are oriented in parallel directions on the boundaries, then the viewing angle is restricted, but the double refraction of light is reduced
Solution Approach 1:
The step structure creates local variations in the liquid crystal layer thickness and molecular orientation. On the step surfaces, the molecules are inclined at specific angles, while on the flat boundaries they remain in parallel orientation. This local quality differentiation allows the system to achieve both improved viewing angle through the step regions and controlled double refraction compensation through the parallel boundary alignment.
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 enables rapid and uniform transition of liquid crystal molecules from splay to bend alignment, reducing warm-up time and maintaining display quality without significant changes to the manufacturing process.
Implementation Method 1
When an electric field is applied between the pixel electrode and the common electrode, the liquid crystal molecules in the liquid crystal layer are affected by the electric field. The liquid crystal molecules are twisted into the bend state from the splay state.
Implementation Method 2
Such type of bent alignment can result in double refraction of the light.
Data Source
AI summary
An optical compensated bend (OCB) mode liquid crystal display (LCD) includes a pixel electrode, a color filter, a common electrode and a liquid crystal layer. The pixel electrode is formed on the first substrate of the OCB mode LCD. The color filter is formed on the second substrate of the OCB mode LCD. The common electrode is formed on the color filter. The liquid crystal layer is sandwiched between the first substrate and the second substrate. A step structure is formed on the second structure, so that the liquid crystal molecules in the liquid crystal layer are twisted into the bend state from the splay state uniformly and quickly.