LCD Diffraction Plate and BEF Orientation for Viewing Angle
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Solution Overview
Problem
Conventional LCDs, particularly TN and VA types, suffer from poor viewing angle performance, leading to issues with brightness, chroma, contrast, gray level inversion, and color shift, which are exacerbated by complex pixel and signal designs that increase costs and reduce aperture ratios.
Innovation Solution
The implementation of a liquid crystal display (LCD) structure that includes a liquid crystal panel, a diffraction plate, and polarizers, with specific angular relationships between the diffractive direction of the diffraction plate and the light-collecting direction of the brightness enhancement film, to improve image quality uniformity and dark state performance across various viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex pixel and signal designs are used to improve viewing angle performance, then image quality uniformity improves, but device complexity and cost increase
Solution Approach 1:
The patent introduces a diffraction plate as an intermediary optical element between the liquid crystal panel and the viewer. This plate diffracts light to compensate for viewing angle effects, achieving image quality uniformity without requiring complex pixel designs or signal processing. The diffraction plate acts as a passive optical mediator that corrects brightness and chroma variations across different viewing angles.
2Ease of manufacture
If conventional LCD structures are used, then manufacturing simplicity is maintained, but viewing angle performance deteriorates
Solution Approach 1:
The patent creates a composite optical system by combining the liquid crystal panel with a diffraction plate having specific refractive index properties. This composite structure maintains the simplicity of conventional LCD manufacturing while adding viewing angle compensation functionality through the diffraction plate's optical properties, achieving both ease of manufacture and improved viewing angle performance.
3Illumination intensity
If brightness enhancement films are added to improve light distribution, then illumination uniformity improves, but device complexity and cost increase
Solution Approach 1:
The patent changes the optical parameters of the system by introducing a diffraction plate with specific refractive index and thickness parameters. This parameter change enables the plate to diffract light in a manner that compensates for viewing angle effects, achieving brightness uniformity without adding multiple brightness enhancement films or complex optical structures.
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 enhances image quality uniformity and dark state performance by compensating for brightness and chroma differences at different viewing angles, reducing the need for complex designs that increase costs and reduce aperture ratios.
Implementation Method 1
The diffraction plate is disposed on a first surface of the liquid crystal panel, and has at least one diffractive direction
Implementation Method 2
The first polarizer is disposed between the liquid crystal panel and the diffraction plate, and has a first absorption axis. The second polarizer is disposed on a second surface of the liquid crystal panel, and has a second absorption axis
Implementation Method 3
The first brightness enhancement film has a first light-collecting direction. The second brightness enhancement film has a second light-collecting direction substantially perpendicular to the first light-collecting direction
Data Source
AI summary
A liquid crystal display (LCD) is provided and includes an liquid crystal panel, a diffraction plate, a first polarizer, a second polarizer, a first brightness enhancement film (BEF), and a second BEF. The diffraction plate is disposed on a first surface of the liquid crystal panel and has a diffractive direction. The first polarizer is disposed between the diffraction plate and the liquid crystal panel and has a first absorption axis. The second polarizer is disposed on a second surface of the liquid crystal panel opposite to the first surface and has a second absorption axis perpendicular to the first absorption axis. The first BEF has a first light-collecting direction. The second BEF has a second light-collecting direction perpendicular to the first light-collecting direction. The first light-collecting direction is parallel or perpendicular to the diffractive direction or the first absorption axis.