Liquid Crystal Display Domain Segmentation for Response Speed
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Solution Overview
Problem
Conventional liquid crystal display devices face challenges in achieving an ideal dark state and improving response speed, particularly in switching from an ON to an OFF state, due to difficulties in controlling the orientation of liquid crystal molecules without electric field control.
Innovation Solution
Incorporating a chemical compound with a liquid crystal skeleton into the liquid crystal layer, which is divided into multiple domains, to control the orientation of liquid crystal molecules and improve response speed by forming a liquid crystalline monomer or polymer, thereby enhancing the falling response time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a TN mode liquid crystal display device is used, then the liquid crystal molecules can be easily oriented and the operating temperature range is broad, but the dark state cannot be achieved ideally due to residual birefringence near the substrate surface
Solution Approach 1:
The patent inverts the conventional TN mode orientation approach by using a perpendicular orientation mode where liquid crystal molecules are oriented perpendicular to the substrate surface instead of parallel. This inversion allows the molecules to be controlled more effectively near the substrate surface, eliminating residual birefringence and achieving an ideal dark state while maintaining ease of orientation through the use of rubbing treatment on the substrate.
2Manufacturing precision
If the perpendicular orientation mode is used to improve contrast ratio, then the dark state quality is improved, but the response time particularly the falling response time becomes longer
Solution Approach 1:
The patent segments the liquid crystal layer into multiple domains by controlling the orientation direction in different regions. This segmentation allows the liquid crystal molecules to switch orientation more efficiently by rotating within smaller domains rather than across the entire layer, thereby reducing the falling response time while maintaining the dark state quality of the perpendicular orientation mode.
Solution Approach 2:
The patent applies periodic voltage pulses to accelerate the response time. By using alternating voltage cycles, the liquid crystal molecules are stimulated to switch orientation more rapidly during the ON state and return more quickly during the OFF state, reducing the falling response time while preserving the perpendicular orientation mode's dark state performance.
3Speed
If strong electric field is applied to speed up the rising response time, then the response speed is improved, but the control to improve falling response time becomes difficult
Solution Approach 1:
The patent employs dynamic control of the electric field by adjusting the voltage waveform and frequency according to the desired response. By making the electric field application dynamic rather than static, the system can optimize both rising and falling response times through carefully designed voltage pulses that provide strong fields when needed for fast switching while maintaining ease of control through automated waveform generation.
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 improved response speed and reduced afterimage, leading to enhanced display quality and the ability to support high-speed operation methods like field sequential drive.
Implementation Method 1
a display method using that light-transmitting property is obtained by birefringence of these liquid crystal molecules
Implementation Method 2
By applying an electric field by at least one electrode arranged on a flat surface where the liquid crystal of a flat plate is arranged, a liquid crystal molecule is switched by the intensity and existence or nonexistence of the electric field
Data Source
AI summary
In the present invention, it is an object to improve display quality by improving response speed of a liquid crystal element in a liquid crystal display device, in particular, response speed in the case of falling. In the present invention, it is characterized that a liquid crystal layer is divided into plural regions (domains) substantially by mixing a chemical compound including a liquid crystal skeleton in a liquid crystal layer having existing liquid crystal molecules as a technique to improve response speed of a liquid crystal element in a liquid crystal display device for solving the above problem.