Photoalignment Film Pretilt Angle Control via Anchoring Structure
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Solution Overview
Problem
Current photoalignment technology for horizontal alignment films in liquid crystal display apparatuses cannot achieve a pretilt angle greater than 0°, limiting its application to specific display modes like TN or ECB modes.
Innovation Solution
Incorporating a liquid crystal display panel with photoalignment films on both substrates and an anchoring structure, along with an alignment sustaining layer formed from photopolymer, to control the pretilt angle of liquid crystal molecules, allowing for a pretilt angle greater than 0°.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If photoalignment processing is used for horizontal alignment film, then dust and static electricity are not generated, but the pretilt angle cannot be controlled to be greater than 0°
Solution Approach 1:
The alignment system is divided into two independent components: photoalignment film for dust-free pretilt orientation control and anchoring structure for pretilt angle control. This segmentation allows each component to specialize in one function, resolving the contradiction between dust reduction and pretilt angle control.
Solution Approach 2:
The anchoring structure acts as an intermediary element that provides the missing pretilt angle control function while the photoalignment film maintains its dust-free operation. This intermediary approach allows both requirements to coexist without compromise.
2Adaptability or versatility
If photoalignment processing is used for horizontal alignment film, then alignment direction can be freely controlled, but pretilt angle greater than 0° cannot be achieved
Solution Approach 1:
The alignment control functions are segmented into two independent systems: photoalignment film for alignment direction (pretilt orientation) control and anchoring structure for pretilt angle control. This enables both alignment direction versatility and pretilt angle precision to be achieved simultaneously.
Solution Approach 2:
The photoalignment film and anchoring structure are combined in the same liquid crystal display apparatus to achieve complementary functions. The photoalignment film provides alignment direction control while the anchoring structure provides pretilt angle control, merging two specialized components to resolve the contradiction.
3Adaptability or versatility
If current photoalignment technology is used, then horizontal alignment is achieved, but application to TN mode or ECB mode is limited
Solution Approach 1:
The combined photoalignment film and anchoring structure system provides universal applicability across multiple display modes (VA mode, IPS mode, FFS mode, TN mode, ECB mode) by delivering both alignment direction control and pretilt angle control, making the system multi-functional and mode-agnostic.
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
Enables the realization of a horizontal alignment state with a pretilt angle greater than 0°, expanding the applicability of photoalignment technology to various liquid crystal display modes.
Implementation Method 1
an alignment sustaining layer which is formed on a surface of each of the first horizontal alignment film and the second horizontal alignment film on the liquid crystal layer side, is configured with a photopolymer
Implementation Method 2
photoalignment processing is put to practical use... A photoalignment film of this liquid crystal display apparatus is a vertical alignment film that causes liquid crystal molecules to be vertically aligned
Data Source
AI summary
A liquid crystal display apparatus includes a liquid crystal display panel including a first substrate, a second substrate, and a liquid crystal layer and a plurality of pixels. The first substrate includes a first electrode provided in each of the pixels and a first horizontal alignment film that determines a pretilt orientation of a liquid crystal molecule. The second substrate includes a second electrode provided to face the first electrode and a second horizontal alignment film that determines the pretilt orientation of the liquid crystal molecule. Each of the first and second horizontal alignment films is a photoalignment film. At least one of the first substrate and the second substrate includes an anchoring structure in each of the pixels. The liquid crystal display panel further includes an alignment sustaining layer which is formed on the surface of each of the first and second horizontal alignment films on the liquid crystal layer side, is configured with a photopolymer, and imparts a pretilt angle greater than 0° to the liquid crystal molecules.