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Futaba Europe GmbH November 2009

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Presentation on theme: "Futaba Europe GmbH November 2009"— Presentation transcript:

1 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

2 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

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

4 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 torr, to ensure free electron movement. Anode Insulation Layer Grid Glass Substrate Anode Wiring

5 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

6 How to drive a Graphic CIG VFD ?

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

8 Grid Scan Timing

9 Anode & Grid Construction (e.g. GP1184AI)

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

11 Anode & Grid Timing Sequence

12 Anode & Grid Timing Sequence

13 Anode & Grid Timing Sequence

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

15 Anode & Grid Timing Sequence

16 Anode & Grid Timing Sequence

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

18 Shift Register Assignment
Anode Data Grid Data

19 Dimming

20 VFD Power Supply Methods

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

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

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

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