FFS Liquid Crystal Display Viewing Angle Optimization
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Solution Overview
Problem
Conventional fringe field switching (FFS) liquid crystal display devices often fail to meet the demand for excellent viewing angle characteristics, particularly in medical monitors and other applications where fine color tone differences and viewing angle performance are critical.
Innovation Solution
The proposed liquid crystal display device incorporates a liquid crystal display panel with a specific configuration, including a first and second substrate with alignment films, polarizers, and a retardation plate, where the alignment axes of the films and polarizers are strategically oriented to enhance viewing angle characteristics. The configuration involves the placement of a retardation plate between the substrates and polarizers, with specific angular relationships between the polarizers' absorption axes and the retardation plate's extension axis, optimized by equations such as y=ax+90, z=bx, and z=c(y−90), to improve image formation and reduce black luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional FFS liquid crystal display devices are used, then transmittance is improved, but viewing angle characteristics deteriorate
Solution Approach 1:
The patent changes the angular parameters of the optical components. Specifically, the absorption axis of the upper polarizer is set at an angle of 1 to 45 degrees inclusive with the alignment axis, and the absorption axis of the lower polarizer is set at 91 to 135 degrees inclusive or 45 to 89 degrees inclusive with the alignment axis. This parameter optimization resolves the contradiction by achieving both high transmittance and excellent viewing angle characteristics through precise angular configuration.
Solution Approach 2:
The patent introduces a retardation plate as an intermediary component between the polarizers and the liquid crystal layer. The extension axis of the retardation plate is set at 1 to 45 degrees inclusive with the alignment axis. This intermediary element mediates the optical path to simultaneously achieve high transmittance and wide viewing angle characteristics, resolving the technical contradiction.
2Productivity
If FFS liquid crystal display devices are used, then manufacturing efficiency is improved, but color accuracy and viewing angle performance deteriorate
Solution Approach 1:
The patent optimizes the angular parameters of the optical components to achieve both high transmittance and excellent viewing angle characteristics. By setting the absorption axis of the upper polarizer at 1 to 45 degrees inclusive with the alignment axis, and the absorption axis of the lower polarizer at 91 to 135 degrees inclusive or 45 to 89 degrees inclusive with the alignment axis, the patent resolves the contradiction between manufacturing efficiency and color accuracy/viewing angle performance.
Solution Approach 2:
The patent creates a universal configuration that can be applied to FFS liquid crystal display devices while achieving multiple performance goals simultaneously. The specific angular configuration of the polarizers and retardation plate provides a multi-functional solution that delivers both manufacturing efficiency and high color accuracy with excellent viewing angle 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 significantly enhances viewing angle characteristics and reduces black luminance, providing improved performance in FFS liquid crystal display devices, even when viewed from various angles, thus meeting the demands of applications requiring high color accuracy and viewing angle performance.
Implementation Method 1
a fringe field switching (FFS) liquid crystal display device has excellent transmittances
Implementation Method 2
controls transmittances by rotating a liquid crystal with an electric field in parallel with a substrate
Implementation Method 3
a first alignment film is formed on the first electrode; a second alignment film is formed on the second substrate. An alignment axis of the first alignment film and an alignment axis of the second alignment film are directed in the same direction
Implementation Method 4
An upper polarizer is disposed on the second substrate, a lower polarizer is disposed below the first substrate
Implementation Method 5
a retardation plate is disposed between the lower polarizer and the first substrate or between the upper polarizer and the second substrate
Data Source
AI summary
In an FFS liquid crystal display device, viewing angle characteristics are further improved. In an FFS liquid crystal display device, the alignment axis of a first alignment film of a first substrate and the alignment axis of a second alignment film of a second substrate are directed in the same direction. At least two of an upper polarizer, a lower polarizer, or a retardation plate 160 satisfy conditions below. (1) The absorption axis of the upper polarizer forms an angle of one to 45 degrees inclusive with the alignment axis. (2) The absorption axis of the lower polarizer forms an angle of 91 to 135 degrees inclusive or forms an angle of 45 to 89 degrees inclusive with the alignment axis. (3) The extension axis of the retardation plate 160 forms an angle of one to 45 degrees inclusive with the alignment axis.