Anisotropic Diffusion Film for LCD Viewing Angle Uniformity
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Solution Overview
Problem
Liquid crystal display devices using the field sequential system face challenges with slow response speed and non-uniform viewing angle characteristics, which affect the energy efficiency and contrast of the display.
Innovation Solution
A liquid crystal display device is designed with a TN-type panel and an anisotropic diffusion film attached to the polarizing plates, which compensates for the non-uniform viewing angle characteristics by varying the emission intensity of light based on the azimuth direction, enhancing the response speed and contrast uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a TN-type liquid crystal panel is used to achieve fast response speed, then the response time is improved, but the viewing angle characteristics become non-uniform
Solution Approach 1:
An anisotropic diffusion film is introduced as an intermediary component between the polarizing plate and the liquid crystal panel. This film has specific optical properties that compensate for the non-uniform viewing angle characteristics of the TN-type liquid crystal, thereby improving viewing angle uniformity without compromising the fast response speed
Solution Approach 2:
The invention changes the optical parameters of the system by using an anisotropic diffusion film with specific transmission characteristics. The film's anisotropic optical properties are designed to counterbalance the viewing angle dependence of the TN liquid crystal panel, achieving uniform viewing angle characteristics across different observation directions
2Speed
If the liquid crystal response time is reduced for field sequential operation, then the operating speed is improved, but the viewing angle and contrast are reduced
Solution Approach 1:
The anisotropic diffusion film serves as a mediator that improves viewing angle characteristics without requiring changes to the liquid crystal response time. This allows the system to maintain fast response for field sequential operation while achieving uniform contrast and viewing angle through the optical compensation provided by the film
3Illumination intensity
If a color filter is used in the liquid crystal display device, then the color display is improved, but the backlight energy efficiency is reduced
Solution Approach 1:
The invention extracts and removes the color filter component from the traditional liquid crystal display structure. By eliminating the color filter, the system achieves significantly improved backlight energy efficiency, as light is no longer absorbed by the color filter materials. The field sequential driving method is used to generate colors through temporal multiplexing of red, green, and blue subfields
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
The solution achieves sufficient response speed and uniform viewing angle characteristics, improving the energy efficiency and contrast of the liquid crystal display device for field sequential operation.
Implementation Method 1
An anisotropic diffusion film is attached onto a polarizing plate which is located on a display surface side of the liquid crystal display panel. The emission intensity of parallel light incident on the anisotropic diffusion film varies depending on the azimuth direction.
Implementation Method 2
A liquid crystal is interposed between the TFT substrate and the counter substrate. Then, an image is formed by controlling the transmittance of light through each pixel by the liquid crystal molecules.
Implementation Method 3
a first polarizing plate is attached to the outside of the first substrate, and a second polarizing plate is attached to the outside of the second substrate
Data Source
AI summary
To achieve a liquid crystal display device of a field sequential system with sufficient response speed and uniformity of viewing angle, the liquid crystal display device includes polarizing plates attached on front and back surfaces of a liquid crystal display panel, a backlight provided on the back surface of the liquid crystal display panel, and an anisotropic diffusion film provided on the front side of the liquid crystal display panel. The liquid crystal display panel and the backlight are driven by the field sequential system. The distribution of the contrast of the liquid crystal display panel varies depending on the azimuth direction. Then, the azimuth direction in which the contrast of the liquid crystal display panel is small is equal to the azimuth direction in which the emission intensity when parallel light is incident on the anisotropic diffusion film is strong, to achieve uniform contrast in all azimuth directions.