Display Device Alignment Film Contact Organic Insulating Film
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices with polymer dispersed liquid crystal layers face challenges in maintaining uniform display quality due to the formation of gaps between the liquid crystal layer and the substrates, leading to unintended light scattering and alignment failures.
Innovation Solution
The display device configuration includes a first substrate with a switching element, a pixel electrode, and an organic insulating film, and a second substrate with an alignment film, where at least a part of the first alignment film overlaps with the organic insulating film and is in contact with the second alignment film, thereby suppressing the formation of gaps and ensuring uniform liquid crystal alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a spacer is used to maintain cell gap, then the cell gap uniformity is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The invention extracts and eliminates the spacer component from the display device structure. By making the organic insulating film thicker in specific regions, the spacer is no longer needed to maintain cell gap uniformity, thereby simplifying the device structure while achieving the same functional result.
Solution Approach 2:
The invention changes the thickness parameter of the organic insulating film to achieve cell gap control. By making the organic insulating film thicker in regions where the alignment film contacts it, the cell gap uniformity is maintained without requiring additional spacer structures.
2Stability of the object's composition
If the organic insulating film is made thicker to prevent gap formation, then the liquid crystal alignment uniformity is improved, but the manufacturing precision requirement increases
Solution Approach 1:
The invention applies local quality by making the organic insulating film thicker only in specific regions where it overlaps with and contacts the alignment film. This localized thickness increase prevents gap formation at critical areas while maintaining overall manufacturing feasibility.
Solution Approach 2:
The invention performs preliminary action by designing the organic insulating film thickness distribution in advance to prevent gap formation. The thicker organic insulating film is prepared beforehand in regions where alignment film contact occurs, proactively preventing alignment issues before they arise.
3Reliability
If the alignment film contacts the organic insulating film, then the gap formation is suppressed, but the alignment film manufacturing complexity increases
Solution Approach 1:
The invention merges the functions of the organic insulating film and the alignment film by allowing them to contact each other. This integration eliminates the need for separate spacer structures and simplifies the overall manufacturing process while effectively preventing gap formation.
Solution Approach 2:
The organic insulating film serves multiple functions: it provides electrical insulation and simultaneously maintains cell gap uniformity where it contacts the alignment film. This multi-functionality reduces the need for additional components and simplifies the overall device structure.
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 improves display quality by preventing unintended light scattering and alignment failures, resulting in a more uniform and stable display. Additionally, the simplified manufacturing process without a spacer reduces production costs and complexity.
Implementation Method 1
The polymer dispersed liquid crystal layer can switch a transparent state in which light is transmitted and a scattered state in which light is scattered, depending on the application of voltage.
Data Source
AI summary
According to one embodiment, a display device includes a first substrate, a second substrate, and a liquid crystal layer. The first substrate includes a first transparent substrate, a scanning line, a signal line, a switching element, an organic insulating film including an aperture and overlapping with the scanning line, the signal line, and the switching element, and a first alignment film overlapping with the organic insulating film. The second substrate includes a second transparent substrate, and a second alignment film overlapping with the second transparent substrate. At least a part of a portion of the first alignment film, which overlaps with the organic insulating film, is in contact with the second alignment film.