Observatorio de I+D+i UPM

Descripción
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.
Internacional	Si
Nombre congreso	15th European Conference on Liquid Crystals
Tipo de participación	970
Lugar del congreso	Wrocraw, Poland
Revisores	Si
ISBN o ISSN	0000-0000
DOI
Fecha inicio congreso	30/06/2019
Fecha fin congreso	05/07/2019
Desde la página	1
Hasta la página	1
Título de las actas	Simple electronic driver circuit for liquid crystal devices

Esta actividad pertenece a memorias de investigación

• Autor: Patxi Xabier Quintana Arregui (UPM)
• Autor: Manuel Caño Garcia (UPM)
• Autor: Ricardo Hervas Garcia (UPM)
• Autor: Juan José Alberca (Lasing)
• Autor: Jose Manuel Oton Sanchez (UPM)
• Autor: Morten Andreas Geday (UPM)

• Creador: Grupo de Investigación: Grupo de Fotónica Aplicada
• Departamento: Tecnología Fotónica y Bioingeniería