Publications by authors named "Yan-dong Ouyang"
Article Synopsis
- * Voltage-drive mode showed significant variations in transmissivity, reaching a maximum difference of 11%, while frequency-drive mode exhibited more uniform changes with a maximum difference of 4%.
- * To enhance display quality, adjustments in color settings are necessary, aiding in further research to improve liquid crystal display performance.
[The analysis of polarized display characteristic of LCLV].
Guang Pu Xue Yu Guang Pu Fen Xi
March 2007
The polarized TN effect of LCLV is discussed, and the twist of LC molecule with the AC voltage in LCLV is analyzed after its reorientation. While changing the applied voltage continuously at certain frequency, the twist angle of LC molecule in TB3639 LCLV and the electro-optical characteristic of the LCLV were measured. The results show that when the voltage is changed in series, the transmittance of the incidence linearly polarized light will alter continuously and nonlinearly, and the twist degree may control the nonlinear change.
View Article and Find Full Text PDF[Study on electro-optical performance of frequency driven liquid crystal light valve].
Guang Pu Xue Yu Guang Pu Fen Xi
February 2007
Article Synopsis
- The study analyzes the electro-optical characteristics and principles of a frequency-driven liquid crystal light valve, specifically the TB3639 model.
- Measurements indicate that this light valve can produce various gray scales in visible light, allowing for black, white, and different shades.
- The frequency-driven method maintains a consistent effect on the transmission spectrum across different wavelengths, reducing chromatic issues and enhancing display quality for potential new applications in liquid crystal display devices.
[Analysis of chromaticity and spectral properties of car solar films].
Guang Pu Xue Yu Guang Pu Fen Xi
November 2006
Chromaticity and spectral properties of the ordinary car solar films of a certain brand in the market were qualitatively measured and analyzed with WGS-9 chromaticity analysis system, UV-Vis 8500 double-beam ultraviolet/visible spectrometer and WGD-4A grating spectrometer. The result shows that getting low infrared/ultraviolet transmissivity and high visible light transmissivity at the same time is impossible, so only one aspect can be fulfilled when we choose solar films. Solar films with main wavelength 587.
View Article and Find Full Text PDF[Analysis of LCD aging with polarized optical texture and transmission spectrum].
Guang Pu Xue Yu Guang Pu Fen Xi
August 2006
Light radiation experiment was done to a group of liquid crystal display devices, and the influence of light radiation on the display quality of liquid crystal display devices was studied. The changes in their polarized textures after light radiation were observed with a polarized optical microscope. Parallel stripe texture and black holes, which lost extinction function, appeared in liquid crystal texture.
View Article and Find Full Text PDF[Study on photoelectric dispersion characteristic of liquid crystal light valve].
Guang Pu Xue Yu Guang Pu Fen Xi
March 2006
Article Synopsis
- The study focused on the electro-optical properties and dispersion characteristics of a specific liquid crystal light valve (LCLV), using the TB3639 model.
- Experiments were conducted at 27°C, measuring light transmission as a function of wavelength and varying applied voltages at a frequency of 1000 Hz.
- Results indicated that the TB3639 LCLV achieved a high contrast ratio (over 0.95) and low dispersion in the visible spectrum, particularly between 550-670 nm, maintaining a consistent contrast ratio greater than 0.8 from 450-750 nm.
Article Synopsis
- A dual-beam UV-Vis spectrometer was used to analyze the spectral properties of a specific brand of car solar films.
- The ordinary series of films showed good transparency but had moderate violet insulation and heat insulation, while their thermal-proof ability was lacking.
- The super front series of films stood out with excellent transparency and solid violet and heat insulation properties, making them the best option among the tested films.
[Influence of sun radiation on optical properties of liquid crystal display device].
Guang Pu Xue Yu Guang Pu Fen Xi
January 2006
Article Synopsis
- - Sunlight exposure negatively impacts the stability and lifespan of liquid crystal display (LCD) devices, leading to rapid aging over time.
- - A study using a spectrophotometer measured how prolonged sunlight affects the optical properties of different LCD groups: calculators and telephones (B and C groups) had similar and relatively good qualities, while personal computer LCDs (A group) experienced more severe aging and poorer quality.
- - The prolonged sunlight exposure causes changes in the structural and optical properties of LCDs, resulting in yellowing and reduced spectrum transmission, which is associated with the materials and manufacturing methods used.
[Analysis of spectral properties of novel holographic transmission notch filter].
Guang Pu Xue Yu Guang Pu Fen Xi
April 2005
Optical filter has extremely important applications in spectroscopy, optical measurement and laser physics. Holographic filter, especially the transmission volume holographic notch filters using dichromate gelatin (DCG), is a new kind of filter with the main characteristic of a very narrow bandwidth. In this paper, measurements were carried out on the spectral properties of this transmission volume holographic notch DCG filter using an ultraviolet-visible transmittance spectrometer.
View Article and Find Full Text PDF[Analysis of spectral properties of oil matrix raw materials in skin care products].
Guang Pu Xue Yu Guang Pu Fen Xi
February 2005
There are many kinds of oil matrix raw materials used in skin care products. Their spectral properties are different. The matrix raw material that has better ultra-violet absorption will enhance the sun-screening agent effect obviously.
View Article and Find Full Text PDF[Study on spectral properties of Chinese herbal medicines additives in cosmetic].
Guang Pu Xue Yu Guang Pu Fen Xi
December 2004
Chinese herbal medicines as additives in cosmetic can both keep the properties of cosmetic and have maintaining, health protection and remedial effect. Some of the Chinese herbal medicines can absorb ultraviolet and cure sunburn. This article mainly studies the spectral properties of several kinds of Chinese herbal medicine additives in cosmetic by ultraviolet and visible spectrophotometer, and analyses the ultraviolet absorption of the Chinese herbal medicine additives.
View Article and Find Full Text PDF[Analysis of anti-ultraviolet characteristic of liquid-crystal display].
Guang Pu Xue Yu Guang Pu Fen Xi
May 2004
As liquid-crystal display is developing to be used outside and becomes colorful and larger, the influence of ultraviolet on liquid-crystal display is becoming more and more apparent. And the anti-ultraviolet character of liquid-crystal display becomes more important. In this paper, the spectroscopic characteristics of ITO glass and polaroid were measured with ultraviolet of various wavelengths.
View Article and Find Full Text PDF[Study on spectral properties of natural plant ultraviolet absorbent].
Guang Pu Xue Yu Guang Pu Fen Xi
November 2004
Article Synopsis
- Natural plant ultraviolet absorbent is a safe, cosmetic-friendly UV additive with no side effects and is expected to have a promising future.
- It is created from UV-absorbing plants processed in an organic solvent, resulting in a brown solid that turns light yellow in liquid form when mixed with alcohol and water.
- Spectral analysis shows that it has low transmittance (below 0.2%) in UVC and UVB light, indicating strong UV absorption, while in the UVA range (around 375 nm), transmittance is only 2.1%, confirming its effectiveness against longer wavelengths of UV light.