Thickness dependence of the switching time of the bistable boundary layer liquid crystal display

1984 ◽  
Vol 44 (8) ◽  
pp. 813-815 ◽  
Author(s):  
R. N. Thurston ◽  
G. D. Boyd ◽  
Donna Cowell Senft
Keyword(s):  
Boundary Layer ◽  
Liquid Crystal ◽  
Switching Time ◽  
Liquid Crystal Display ◽  
Thickness Dependence

Experiments in switching the bistable boundary layer liquid crystal display by the application of dc

1984 ◽  
Vol 55 (10) ◽  
pp. 3846-3855 ◽  
Author(s):  
R. N. Thurston ◽  
G. D. Boyd ◽  
Donna Cowell Senft
Keyword(s):  
Boundary Layer ◽  
Liquid Crystal ◽  
Liquid Crystal Display

Hygromechanical Analysis of Liquid Crystal Display Panels

2013 ◽  
Vol 135 (4) ◽  
Author(s):  
Toru Ikeda ◽  
Tomonori Mizutani ◽  
Kiyoshi Miyake ◽  
Noriyuki Miyazaki
Keyword(s):  
Boundary Layer ◽  
Liquid Crystal ◽  
Numerical Analysis ◽  
Diffusion Coefficients ◽  
Liquid Crystal Display ◽  
Fem Analysis ◽  
Contact Condition ◽  
Henry's Law ◽  
Henry’S Law ◽  
The Difference

Liquid crystal displays (LCDs) are getting larger, and the homogeneity of an LCD panel is becoming very important for the quality of the display. Inhomogeneity in an LCD panel can be caused by inhomogeneity of its materials and the defective production process, warpage of the panel due to changes in the temperature and humidity, and so on. In this study, we developed a scheme of hygromechanical analysis to reduce the warpage of an LCD. First, we measured the diffusion coefficients and Henry's law coefficients of the respective components of an LCD using a thermogravimetric analyzer (TGA) under controlled humidity. We then measured the coefficients of moisture expansion (CME) of the components using a humidity-controlled thermomechanical analyzer (TMA). We analyzed the hygromechanical deformations of the respective components, a polarizing plate and an LCD panel using the finite element method (FEM) with measured diffusion coefficients, Henry's law coefficients and the CMEs of the respective components. The analyzed deformations of the respective components corresponded quantitatively with the deformations measured experimentally. However, the analyzed deformation of the polarizing plate did not correspond with the measured deformation perfectly. A polarizing plate is made by sandwiching a polarizer between two sheets of protection film. We ignored the effect of the thin boundary layer between the polarizer and its protecting film in this analysis, and the effect of this boundary layer on the diffusion of moisture may have caused the difference between the analysis and the measurement. The expected warpage of the analyzed LCD corresponded qualitatively with the measured warpage. However, the numerical analyzed strains near the edge of the LCD panel strongly shifted to the compression side compared to the experimental measured strains. A possible reason for this shift was the difference in the boundary condition at the edge of the LCD panel between the numerical analysis and the experimental measurement. The actual edge of the LCD panel was fastened by a bezel, and the contact condition between the LCD panel and the bezel was ambiguous. To perform a quantitative analysis, we will need to investigate the contact condition between the LCD panel and the bezel and introduce it to the numerical analysis. This is left for a future study. We qualitatively investigated the warpage of LCDs with two types of protecting film and different directions of polarizing plates using the developed technique of FEM analysis.

Multiplexing the bistable boundary layer liquid crystal display

1984 ◽  
Vol 44 (7) ◽  
pp. 655-657 ◽  
Author(s):  
Donna Cowell Senft ◽  
Gary D. Boyd ◽  
R. N. Thurston
Keyword(s):  
Boundary Layer ◽  
Liquid Crystal ◽  
Liquid Crystal Display

Discovery of dc switching of a bistable boundary layer liquid crystal display

1983 ◽  
Vol 43 (4) ◽  
pp. 342-344 ◽  
Author(s):  
Robert B. Meyer ◽  
R. N. Thurston
Keyword(s):  
Boundary Layer ◽  
Liquid Crystal ◽  
Liquid Crystal Display

Sistem Kontrol Pengisian Air Otomatis Dengan Dua Sumber Suplai Berbasis Mikrokontroler (ATmega 8535)

2016 ◽  
Vol 1 (2) ◽  
pp. 84 ◽  
Author(s):  
Sumardi Sumardi ◽  
Muhammad Nur Anggoro
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystal Display

Sistem kontrol pengisian air otomatis dengan dua sumber suplai berbasis mikrokontroler merupakan sebuah sistem yang dapat digunakan untuk mengendalikan level air pada sebuah bak penampungan secara otomatis. Bahan dan alat yang digunakan dalam sistem kontrol berupa mikrokontroler ATmega 8535, sensor air, downloader DI-USB AVR ISP V2/DI-USB to Serial TTL, liquid crystal display, transisor, resistor, pompa air, adaptor 12 volt dc, saklar, dan program editor code vision avr. Metode yang digunakan dalam pembuatan sistem kontrol pengisian air otomatis ini adalah melakukan percobaan dan ujicoba peralatan secara langsung. Sistem kontrol ini bekerja dalam dua kondisi yaitu ketika air dalam bak penampungan melewati batas bawah maka bak penampungan akan terisi secara otomatis dan ketika telah mencapai batas atas yang ditentukan maka suplai air ke bak penampungan akan berhenti, selanjutnya ditambah pengaturan dari dua buah sumber air sebagai suplai yang akan bekerja sesuai dengan prioritasnya. Proses tersebut dilakukan oleh sensor bagian input yang berupa sensor air pada masukan sumber air yang kemudian diproses oleh mikrokontroler terprogram. Hasil percobaan menunjukkan sensor air berhasil memberikan logika Low atau High pada keluarannya sebagai fungsinya untuk memberikan sinyal masukan pada port mikrokontrol. Pada kondisi high, sensor air mampu memberikan nilai tegangan 4,89 Volt DC untuk digunakan sebagai masukan mikrokontroler. Dan pada kondisi low, sensor air mampu memberikan nilai tegangan 0,11 Volt dc sebagai masukan mikrokontroler ketika elektroda tehubung dengan common oleh media air. Driver Masukan terbukti dapat digunakan untuk menggendalikan kerja dari motor pompa 220 V AC dan lampu indikator 12 V DC. Hasil yang dari sistem kontrol pengisian air ini adalah terjadinya pengurangan kerugian yang ditimbulkan karena masalah ketersediaan air dan juga mempermudah kegiatan dalam pengendalian ketersediaan air. Kata kunci : Sistem kontrol, pengisan air otomatis, mikrokontroler, sensor air.

Sign in / Sign up

Export Citation Format

Share Document