Memorias de investigación
Communications at congresses:
Simple electronic driver circuit for liquid crystal devices
Year:2019
Research Areas
  • Optics, electromagnetism
Information
Abstract
When manufacturing a liquid crystal device of low or medium complexity (tens or hundreds of elements), the problem is often to find a way to address it electronically. In recent years, several families of microprocessors have appeared. These microprocessors are easily programmed at high level and can control electronic chips in a very simple way through I2C or SPI ports. Many electronic circuits are also available to control, among others, LEDs. In this project we use an Arduino microprocessor and an LED controller to make a driver that addresses 24 elements of an LCD device, being easily scalable in multiples of 24. LabView is used as user interface. An Arduino UNO clone (Funduino) was employed as an USB-SPI interface for transferring a 24×12bit array to a 24-channel 12-bit pulse-width-modulation (PWM) LED driver (TLC5947, Texas Instruments implemented in the Adafruit 1429 board). The 24 output channels of this driver were used as control inputs in six four-channel high speed analogue switches (ADG5412 SPST, Analog Devices Inc.) connecting, or not, the individual SPP electrodes to a 6V, 10kHz square waveform signal generated by an external arbitrary waveform generator (Stanford Instruments DS345). The refresh rate of the LED driver was measured to be 1.4ms, which is far shorter than the relaxation time of a 9µm thick liquid crystal cell. The electronic driver, and the user interface allows for the generation of the desired multilevel discrete SPP profiles needed for the generation of analog levels. Recently a 72 pixels driver has been designed and manufactured with an ad hoc PCB.
International
Si
Congress
15th European Conference on Liquid Crystals
970
Place
Wrocraw, Poland
Reviewers
Si
ISBN/ISSN
0000-0000
Start Date
30/06/2019
End Date
05/07/2019
From page
1
To page
1
Simple electronic driver circuit for liquid crystal devices
Participants
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Grupo de Fotónica Aplicada
  • Departamento: Tecnología Fotónica y Bioingeniería