Futaba Europe GmbH November 2009 Futaba Presentation Good Evening & Welcome we appreciate that all of you could find time within this busy Electronica show to follow our invitation As you may be tired after the second exhibition day, we will try to make this evening as pleasant as possible, and will not bother you with to many figures or statistics Nevertheless we have a number of important and positve news to inform , so we outline the following Agenda Futaba Europe GmbH November 2009

VFD Operation Principle - applied voltage heats up filament which causes thermionic emission - when positive voltage is applied to grids, electrons are accelerated towards anodes - when positive voltage is applied to phosphor coated anode, electrons collide with anodes and excite phosphor resulting in light emission

Function of Grids and Anodes Light Emmision (Grid + & Anode +) Non Light Emmision (Grid - & Anode +/-) Non Light Emmision (Grid + & Anode -)

VFD Construction Exhaust Tip Getter Filament Lead Contact Lead Anode The VFD has a triode structure in which the front and base plate constitute a vacuum envelope, in which the filament cathode, grid and anode are arranged to form electrodes. Figure above shows: The Aluminium wiring pattern. The Carbon insulation layer printed onto the base plate. The anode pattern printed onto the carbon layer. Grid mesh photo etched from stainless steel & placed over the anodes. Grid & anodes are connected to the pins via the wiring on the base plate. Filament wires (Cathodes) are stretched above the grids & anodes and anchored at each end. The complete structure is then sealed at 500°C & evacuated to 10-7 torr, to ensure free electron movement. Anode Insulation Layer Grid Glass Substrate Anode Wiring

CIG (Chip-in-Glass) VFD Construction Driver GND Grid Anode CLK LAT SI BK VDD VH Filament ＶＦＤ Driver Chip Base Glass 15-U IC Input Lead Filament Lead Filament Lead

How to drive a Graphic CIG VFD ?

CIG Shift Registor Operation 15-U Driver Block Diagram Driver Timing Chart

Grid Scan Timing

Anode & Grid Construction (e.g. GP1184AI)

Anode & Grid Timing (e.g. GP1184AI)

Anode & Grid Timing Sequence

Anode & Grid Timing Sequence

Anode & Grid Timing Sequence

Anode & Grid Timing Sequence (e.g. GP1184AI)

Anode & Grid Timing Sequence

Anode & Grid Timing Sequence

Shift Register Block Diagram Anode Data (128bit) Grid Data (64 bit)

Shift Register Assignment Anode Data Grid Data

Dimming

VFD Power Supply Methods

Power Supply Solution 1: Royer circuit Advantage: low component cost & high input voltage possible Disadvantage: custom designed transformer required

Power Supply Solution 2: For small Displays (high voltage) LM9022 Advantage: only standard components required MC34063 Disadvantage: higher component cost & max. 5Vdc input

Cut-off Bias Requirement (Ek) Background: Electron Leakage