Multiple View LCD Parallax Barrier Gap Layer
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Solution Overview
Problem
Parallax barrier-system multiple view liquid crystal displays suffer from crosstalk issues, particularly reverse view crosstalk, due to the gap between the parallax barrier and the black matrix, which affects image quality and viewability, especially when displaying images with large black areas.
Innovation Solution
Incorporating a gap layer with a predetermined thickness between the parallax barrier and the black matrix, and using a reverse-view preventive film with a lower refractive index or light transmittance than the liquid crystal, positioned at the ends of the second light blocking part, to separate light and prevent unwanted image viewing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a gap layer with predetermined thickness is introduced between the parallax barrier and the black matrix, then reverse view crosstalk is suppressed, but the gap size increases
Solution Approach 1:
A gap layer with predetermined thickness is introduced as an intermediary element between the parallax barrier and the black matrix. This gap layer serves as a mediator that controls light propagation paths, preventing reverse view crosstalk while maintaining a practical gap size. The gap layer's specific thickness is designed to optimize light separation without requiring extremely thin substrates.
Solution Approach 2:
The refractive index of the gap layer is specifically controlled to be lower than that of the liquid crystal. This parameter change (refractive index) enables the gap layer to effectively manage light propagation and prevent reverse view crosstalk. By adjusting the refractive index parameter, the system achieves optimal light separation while maintaining a practical gap thickness.
2Object-affected harmful factors
If the gap between the parallax barrier and the black matrix is made smaller, then reverse view phenomenon is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The gap layer acts as an intermediary that defines a predetermined, practical gap size between the parallax barrier and the black matrix. This intermediary structure eliminates the need for extremely tight manufacturing tolerances while still achieving effective reverse view suppression. The gap layer's thickness can be manufactured with standard precision requirements.
3Object-affected harmful factors
If a reverse-view preventive film with lower refractive index is added to the second light blocking part, then crosstalk is prevented, but device complexity increases
Solution Approach 1:
The reverse-view preventive film with lower refractive index is applied locally only to the second light blocking part of the black matrix, specifically at positions where reverse view crosstalk occurs. This localized application prevents crosstalk without requiring modification of the entire display structure, thereby minimizing the increase in device complexity.
Solution Approach 2:
The refractive index parameter of the preventive film is specifically controlled to be lower than that of the liquid crystal. This parameter change enables the film to effectively prevent reverse view crosstalk through controlled light propagation. By optimizing this single parameter, the system achieves effective crosstalk prevention without significantly increasing structural complexity.
4Object-affected harmful factors
If the gap layer thickness is increased, then light separation is improved, but the visual field range decreases
Solution Approach 1:
The refractive index of the gap layer is specifically controlled to be lower than that of the liquid crystal. This parameter change optimizes light separation efficiency, allowing for better crosstalk prevention without requiring excessive gap thickness that would reduce the visual field range. The refractive index parameter provides an additional degree of freedom for optimizing both light separation and visual field characteristics.
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 suppresses reverse view phenomena and crosstalk, improving viewability while maintaining a practical gap size between the parallax barrier and the black matrix, without the need for extremely thin substrates or large pixel pitches, thus enhancing image quality and display resolution.
Implementation Method 1
a reverse-view preventive film with a lower refractive index than that of the liquid crystal
Implementation Method 2
a parallax barrier as a light blocking film which is disposed on the black matrix with the gap layer interposed therebetween and separates light having passed through the openings in the black matrix into different directions
Implementation Method 3
a liquid crystal display, and particularly relates to a multiple view liquid crystal display capable of displaying a plurality of images in respectively different directions
Data Source
AI summary
In a multiple view liquid crystal display, occurrence of a reverse view phenomenon and a reverse view crosstalk are suppressed. A black matrix is formed on the opposed surface of a counter substrate to a TFT substrate in a liquid crystal panel, and a parallax barrier is provided on the black matrix with a gap layer having a predetermined thickness interposed therebetween. The black matrix includes a first light blocking part disposed immediately below an opening in the parallax barrier, and a second light blocking part with a portion immediate thereabove covered by the parallax barrier. The second light blocking part includes a low refractive-index film (reverse view preventive film), having a lower refractive index than that of a liquid crystal, at the end thereof which is in contact with a pixel opening between the second light blocking part and the adjacent first light blocking part.