Itron UK, a subsidiary of Noritake, has launched a 2 row x 20 character vacuum fluorescent display (VFD) which is one of a new range. The chip in glass technology has recently proved to greatly reduce the component and assembly price.
The technology offers an alternative to LED backlit LCD technology, whilst offering the same power consumption and physical size as the backlit LCD. An LCD’s usage may become compromised when levels of humidity, temperature and spatial arrangements are inappropriate. The standard glass VFD offers high brightness with low voltage that is able to permeate oil and grease.
The range of displays incorporate the chip-in-glass technology allowing the module price to be reduced from approximately £90 to £29.73. The DN2025E display provides a wider viewing angle and an operational temperature range from -40 degrees C to +85 degrees C.
When designing a display panel a modular approach is taken by combining a display module and a membrane keyboard. The incorporation of chip-in-glass technology releases significant printed circuit board (PCB) space to minimise both cost and profile. The chip-in glass features the driver integrated circuits(ICs) assembled within the glass envelope which is sealed with a ceramics glue at 450 degrees C for 30 minutes. The display interfaces to a micro controller and power supply via 9-15 pins on a 2mm pitch. The lead pins can be pre formed to reverse mount the display directly onto a PCB.
The fine dot image and high brightness is achieved by supplying a low voltage to a drive chip directly under the phosphor. Every dot is connected to its own memory cell providing a sharp, non flicker display.