Integrated optical devices with liquid crystal overlays for the sensing of volatile organic compounds

1998 ◽  
Author(s):  
Bernd Drapp ◽  
D. Pauluth ◽  
Albrecht Brandenburg ◽  
Guenter Gauglitz
Keyword(s):  
Liquid Crystal ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Optical Devices ◽  
Integrated Optical ◽  
Integrated Optical Devices ◽  
Volatile Organic

scholarly journals Liquid crystal display screens as a source for indoor volatile organic compounds

2021 ◽  
Vol 118 (23) ◽  
pp. e2105067118
Author(s):  
Qifan Liu ◽  
Jonathan P. D. Abbatt
Keyword(s):  
Liquid Crystal ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Indoor Air ◽  
Building Block ◽  
Liquid Crystal Display ◽  
Liquid Crystal Displays ◽  
Emission Rates ◽  
Volatile Organic ◽  
Diffusion Rates

Liquid crystal displays (LCDs) have profoundly shaped the lifestyle of humans. However, despite extensive use, their impacts on indoor air quality are unknown. Here, we perform flow cell experiments on three different LCDs, including a new computer monitor, a used laptop, and a new television, to investigate whether their screens can emit air constituents. We found that more than 30 volatile organic compounds (VOCs) were emitted from LCD screens, with a total screen area–normalized emission rate of up to (8.25 ± 0.90) × 109 molecules ⋅ s–1 ⋅ cm–2. In addition to VOCs, 10 liquid crystal monomers (LCMs), a commercial chemical widely used in LCDs, were also observed to be released from those LCD screens. The structural identification of VOCs is based on a “building block” hypothesis (i.e., the screen-emitted VOCs originate from the “building block chemicals” used in the manufacturing of liquid crystals), which are the key components of LCD screens. The identification of LCMs is based upon the detailed information of 362 currently produced LCMs. The emission rates of VOCs and LCMs increased by up to a factor of 9, with an increase of indoor air humidity from 23 to 58% due to water–organic interactions likely facilitating the diffusion rates of organics. These findings indicate that LCD screens are a potentially important source for indoor VOCs that has not been considered previously.

scholarly journals Exposure to Indoor Volatile Organic Compounds and Hypertension among Thin Film Transistor Liquid Crystal Display Workers

Atmosphere ◽  
2020 ◽  
Vol 11 (7) ◽  
pp. 718
Author(s):  
Ta-Yuan Chang ◽  
Kuei-Hung Huang ◽  
Chiu-Shong Liu ◽  
Bo-Ying Bao
Keyword(s):  
Thin Film ◽  
Blood Pressure ◽  
Liquid Crystal ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Liquid Crystal Display ◽  
Thin Film Transistor ◽  
Health Examination ◽  
Cross Sectional ◽  
Volatile Organic

This cross-sectional study aimed to determine the concentration of indoor volatile organic compounds (VOCs) and to investigate the association between indoor VOCs exposure and the prevalence of hypertension among thin film transistor liquid crystal display (TFT-LCD) workers. A total of 20 canisters were used to collect VOCs samples in the array, cell and module areas over 12 hours and VOCs concentrations were analyzed by the gas chromatography with mass spectrum. Individual information of health examination and lifestyles by self-administrated questionnaire were provided by 155 volunteers. The multivariate regression models were used to evaluate the associations between VOCs exposure, blood pressure and the prevalence of hypertension. The four dominant VOCs were ethanol (1870.8 ± 1754.0 ppb), acetone (689.9 ± 587.4 ppb), isopropyl alcohol (177.1 ± 202.3 ppb) and propylene glycol monomethyl ether acetate (98.2 ± 100.8 ppb), which were identified with the highest level in the module area for ethanol and acetone and in the array area for the others. Subjects exposed to a total level of ethanol, cyclohexanone and toluene ≥ 2500 ppb had an increased systolic blood pressure of 5.95 mmHg (95% confidence interval: 0.20–11.71; p = 0.043) compared with those exposed to <2500 ppb. Exposure to mixed VOCs in the indoor environment might be associated with elevated blood pressure among TFT-LCD workers.

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