Vacuum fluorescent display and filament driving method thereof
AssigneeHoltek Semiconductor Inc.
InventorsChun-Hsiung Chen, Wen-Liang Liu
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Abstract
A vacuum fluorescent display (VFD) and a filament-driving method are provided. Two sub-dc voltages having peaks respectively interlaced with each other on the waveform thereof are used to drive the filament. A driving circuit is integrated in the integrated circuit of a VFD driver, a VFD controller or a VFD MCU. The VFD is able to operate without utilizing a transformer.
Claims9
A vacuum fluorescent display (VFD), comprising:
- a panel having at least a filament with two ends;
- and
- an anode-and-grid control device electrically connected to the two ends of the filament to generate an anode signal, a grid signal and a dc signal;
- wherein the filament is controlled by the dc signal to light the panel in cooperation with the anode signal and the grid signal, the dc signal comprises two sub-signals respectively transmitted to the two ends of the filament, and one of the sub-signals comprises a waveform whose peaks are interlaced with those of the other.
A vacuum fluorescent display (VFD), comprising:
- a panel having at least a filament with two ends;
- and
- an anode-and-grid control device electrically connected to the two ends of the filament to generate a dc signal to light the panel;
- wherein the filament is controlled by the dc signal, the dc signal comprises two sub-signals respectively transmitted to the two ends of the filament, and one of the sub-signals comprises a waveform whose peaks are interlaced with those of the other.
A filament driving method for a vacuum fluorescent display (VFD) comprising a panel having at least a filament and an anode-and-grid control device, comprising steps of:
- providing an anode signal, a grid signal and a dc signal by the anode-and-grid control device to the panel, wherein the dc signal comprises two sub-signals respectively transmitted to two ends of the filament, and one of the sub-signals comprises a waveform whose peaks are interlaced with those of the other;
- and
- controlling the filament with the dc signal in order to light up the panel in cooperation with the anode signal and the grid signal.
Dependencies are inferred from the claim text.