Liquid Crystal Display Alignment Angle Optimization
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Solution Overview
Problem
Liquid crystal display devices face alignment failures known as edge reverse, where the alignment restriction force of the first alignment film is reduced by the electric field, leading to display issues like light leakage, non-uniform luminance, and persistence of vision, due to the electric field generated between adjacent pixel electrodes with different polarities.
Innovation Solution
The liquid crystal display device employs a first alignment film treated at an angle of 110° to 130° relative to the second alignment film, incorporating an optically active substance that provides a twisting force from the second alignment film to the first, stabilizing the liquid crystal molecules' alignment and preventing reverse twist, allowing a transition between twisted structures without electric-field treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional alignment treatment is used for the first alignment film, then the alignment process is simple, but edge reverse occurs due to reduced alignment restriction force from electric field interference
Solution Approach 1:
The patent changes the alignment treatment angle parameter from conventional values (typically 0° or 45°) to a specific range of 110° to 130° relative to the second alignment film. This parameter change modifies the molecular orientation in a way that creates resistance against electric field-induced reverse twist, thereby preventing edge reverse while maintaining manufacturing simplicity
Solution Approach 2:
The patent employs a composite structure involving two alignment films with different treatment directions working together. The first alignment film treated at 110° to 130° combines with the second alignment film to create a synergistic effect where the specific angular relationship provides enhanced stability against electric field interference, preventing edge reverse occurrences
2Reliability
If a thick light-shielding layer is added to prevent edge reverse, then alignment stability improves, but luminance levels decrease
Solution Approach 1:
The patent extracts and eliminates the need for a thick light-shielding layer by implementing the innovative alignment treatment angle. The solution removes the harmful component (excessive light shielding) while retaining the beneficial function (edge reverse prevention) through the angular configuration of alignment films alone
Solution Approach 2:
The patent replaces the mechanical/light-blocking approach (thick light-shielding layer) with an optical/molecular approach (specific alignment treatment angle). Instead of physically blocking light to prevent edge reverse, the solution uses molecular orientation control at 110° to 130° to achieve the same protective effect while maintaining light transmission and luminance
3Adaptability or versatility
If adjacent pixel electrodes with different polarities are used, then color display capability is achieved, but electric field interference reduces alignment restriction force causing edge reverse
Solution Approach 1:
The patent applies preliminary anti-action by pre-configuring the first alignment film at 110° to 130° before the display operation begins. This preliminary angular configuration creates a pre-established molecular orientation that actively resists and counteracts the electric field interference generated by adjacent pixel electrodes with different polarities, preventing edge reverse before it can occur
Solution Approach 2:
The patent introduces asymmetry in the alignment configuration by treating the first alignment film at a non-conventional angle (110° to 130°) relative to the second alignment film. This asymmetric angular relationship creates an uneven molecular orientation pattern that provides differential resistance against electric field interference from adjacent pixels, enabling color display 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
This configuration effectively restricts edge reverse occurrences, maintaining high display quality and allowing for efficient image rendering without the need for a thick light-shielding layer, thus preserving luminance levels.
Implementation Method 1
The liquid crystal layer is formed of a liquid crystal material containing an optically active substance which gives liquid crystal molecules a twisting force from the second alignment film toward the first alignment film in the second direction of rotation
Implementation Method 2
by applying a saturation voltage to a liquid crystal to drive the liquid crystal, the alignment of the liquid crystal can be changed from a first state referred to as a splay twisted state to a second state referred to as a uniform twisted state
Data Source
AI summary
According to one embodiment, a liquid crystal display device includes a liquid crystal layer, a first substrate and a second substrate. The first substrate includes a light reflection type of first pixel electrode and a first alignment film. The second substrate includes a counter-electrode and a second alignment film. A first alignment treatment direction is inclined in a second direction of rotation at an angle of 110° to 130° with respect to in a second alignment treatment direction. A liquid crystal material is used which contains an optically active substance which gives liquid crystal molecules a twisting force from the second alignment film toward the first alignment film in the second direction of rotation.