Liquid Crystal Display Bend State Stabilization via Hydrogen Bonding
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Solution Overview
Problem
Existing liquid crystal display (LCD) devices, particularly in the OCB mode, face issues with maintaining the bend state of liquid crystal molecules, leading to reduced brightness and contrast ratio due to the need for a transition voltage to switch between splay and bend states, and the instability of the bend state near the transition voltage.
Innovation Solution
Incorporating a hydrogen-bonded structure with self-assembled fibers in the liquid crystal layer that maintains the bend state of liquid crystal molecules, eliminating the need for a separate driving circuit to transition between states and allowing for higher light transmittance without applying a white voltage higher than the transition voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a transition voltage is applied to switch between splay and bend states, then the liquid crystal molecules can transition states, but the brightness and contrast ratio are reduced due to the need for higher white voltage
Solution Approach 1:
The liquid crystal molecules are pre-aligned in a bend state during the manufacturing process using rubbing alignment layers. This preliminary alignment eliminates the need for applying transition voltage during operation, allowing the display to operate directly in the bend state with optimized white voltage for maximum brightness and contrast ratio without the penalty of state-transition voltage requirements
2Stability of the object's composition
If a white voltage higher than transition voltage is applied to maintain bend state, then the bend state is maintained, but the light transmittance is reduced
Solution Approach 1:
The liquid crystal molecules are pre-aligned in a bend state during manufacturing, eliminating the need for high white voltage to maintain the bend state. This allows operation at optimized voltage levels that maximize light transmittance while maintaining stable bend state configuration
Solution Approach 2:
The invention changes the operating voltage parameter by eliminating the need for transition voltage. The display operates directly in bend state with optimized white voltage, avoiding the voltage deviation issues and light transmittance reduction associated with applying voltage significantly higher than the transition voltage
3Use of energy by moving object
If the bend state is maintained near transition voltage, then energy consumption is reduced, but the bend state becomes unstable and molecules may transition back to splay state
Solution Approach 1:
The liquid crystal molecules are pre-aligned in a bend state during manufacturing, providing inherent stability without requiring operation near the transition voltage. This preliminary configuration ensures stable bend state maintenance at optimized operating voltages, eliminating the instability and voltage deviation issues associated with operating near the transition point
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 stabilizes the bend state of liquid crystal molecules, reducing product costs, enhancing brightness, and improving the contrast ratio by eliminating the need for a transition voltage and maintaining high light transmittance for displaying white images.
Implementation Method 1
a hydrogen-bonded structure in the liquid crystal layer, the hydrogen-bonded structure having a bow shape to maintain the bend state of the liquid crystal molecules
Implementation Method 2
Incorporating a hydrogen-bonded structure with self-assembled fibers in the liquid crystal layer
Implementation Method 3
a voltage applied between the electrodes induces an electric field across the liquid crystal layer. Alignment of the liquid crystal molecules in the liquid crystal layer changes in accordance with the intensity of the induced electric field into the direction of the induced electric field
Implementation Method 4
An optically compensated birefringence (OCB) mode LCD device has these characteristics
Data Source
AI summary
A liquid crystal display device includes a first substrate; a second substrate facing the first substrate; a pixel electrode on the first substrate; a common electrodes on the second substrate; a first alignment layer on the pixel electrode; a second alignment layer on the common electrode; a liquid crystal layer between the first and second alignment layers, liquid crystal molecules of the liquid crystal layer disposed in a bend state; and a hydrogen-bonded structure in the liquid crystal layer, the hydrogen-bonded structure having a bow shape to maintain the bend state of the liquid crystal molecules.