Liquid Crystal Display Alignment Liquid Control Groove
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Solution Overview
Problem
In liquid crystal display devices, achieving a uniform molecular arrangement of liquid crystals is challenging due to the spread of alignment liquid beyond the display area during application, leading to inefficient image formation.
Innovation Solution
The implementation of an alignment liquid control groove and protrusions in the boundary area between the display and peripheral areas, which prevents the alignment liquid from spreading to the peripheral area by creating a controlled pathway for its application and drying within the groove.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If alignment liquid is applied to the display area, then molecular alignment is achieved, but alignment liquid spreads to the peripheral area causing misalignment
Solution Approach 1:
The boundary area is segmented into multiple regions (first boundary region adjacent to display area, second boundary region adjacent to peripheral area) with different properties. The first boundary region has first viscosity and the second boundary region has second viscosity different from the first, creating zones that control and restrict the spread of alignment liquid while maintaining molecular alignment in the display area.
Solution Approach 2:
Different regions of the boundary area are assigned different viscosities (first viscosity in the first boundary region, second viscosity in the second boundary region) to perform different functions. This local differentiation allows the boundary area to simultaneously prevent liquid spread toward the peripheral area while facilitating proper alignment in the display area.
2Manufacturing precision
If alignment liquid is confined to display area, then image quality improves, but liquid crystal molecule misalignment risk increases
Solution Approach 1:
The viscosity parameter is changed across different regions of the boundary area. The first boundary region has first viscosity and the second boundary region has second viscosity, which is different from the first viscosity. This parameter variation creates a controlled gradient that guides alignment liquid behavior, confining it to the display area while maintaining reliable molecular alignment through the engineered viscosity transition zones.
Data Source
AI summary
A liquid crystal display device includes a display area, a peripheral area, and a boundary area between the display area and the peripheral area and further includes: a first substrate; a switching element disposed on the first substrate in the display area; a pad disposed on the first substrate in the peripheral area and electrically connected with the switching element; a protective film disposed on the first substrate in the display area, the peripheral area, and the boundary area, and covering the switching element and the pad; a color filter disposed on the protective film in the display area; and a planarization film covering the color filter and contacting the protective film in the boundary area and the peripheral area. The planarization film is provided with a first opening overlapping the pad and at least one second opening formed in the boundary area.