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Futaba Presentation Futaba Europe GmbH November 2009.

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

1 Futaba Presentation 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 Non Light Emmision (Grid - & Anode +/-) Light Emmision (Grid + & Anode +) Non Light Emmision (Grid + & Anode -)

4 Lead Getter Exhaust Tip Grid Glass Substrate Contact Lead Anode Wiring Insulation Layer Filament Anode VFD Construction

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

6 How to drive a Graphic CIG VFD ?

7 CIG Shift Registor Operation 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 Grid 1 Grid 2 Anode & Grid Timing Sequence

12 Grid 1 Grid 2 Anode & Grid Timing Sequence

13 Grid 3 Grid 2 Anode & Grid Timing Sequence

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

15 Anode & Grid Timing Sequence

16

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 MC34063 Disadvantage: higher component cost & max. 5V dc input Advantage: only standard components required

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


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