Description of Vacuum Fluorescent (VFD)

VFD, referred to Vacuum Fluorescent Display, are specialized display devices that use VFD technology to render text, graphics, or images. These modules consist of a pair of glass panels with a matrix of anodes and cathodes sandwiched between them. The interior surface of the glass is coated with a phosphorescent material. When electrons from the cathode strike the phosphorescent coating on the anodes, they cause it to emit light, which creates the visible display. This technology allows VFD modules to offer bright and clear visuals, especially in high-contrast and variable lighting environments.

Vacuum Fluorescent (VFD)

Working Principle of Vacuum Fluorescent (VFD)

The operation of a Vacuum Fluorescent Display (VFD) is based on the principle of cathodoluminescence, a process in which electrons, emitted from a heated cathode, impact a phosphor coating, prompting it to emit light.

Advantages of Vacuum Fluorescent (VFD)

1. Brightness and Visibility: VFDs are easier to see in very bright light and darkness.
2. Dimming Capability: VFDs can be dimmed easily for use at night by reducing the time segments are switched on in a multiplexed display.
3. Longevity: VFDs have a reputation for long life and durability, which is beneficial for applications requiring long-term reliability.

4. Simple and Robust Displays: VFDs are preferred for simple displays in electronic instruments and appliances where complex, high-resolution color pictures are not necessary.

Frequently Asked Questions

What is the difference between VFD and LCD display?

1. Light Emission: VFDs produce light through cathodoluminescence, where electrons emitted from a heated cathode excite a phosphor coating, causing it to emit light. In contrast, LCDs modulate the passage of light through liquid crystals to control the amount of light that reaches the viewer.
2. Brightness and Contrast: VFDs are known for their high brightness and contrast, which makes them visible in various lighting conditions, including direct sunlight. LCDs typically have lower brightness and contrast, and often require backlighting to enhance visibility.
3. Color Support: VFDs can display elements in a variety of colors, determined by the type of phosphor used in the anodes. LCDs also support multiple colors but achieve this through color filters and backlighting.

What is the difference between VFD and OLED?

OLEDs illuminate their entire front surface, which allows for an extensive viewing angle as they eliminate the need for a backlight, a requirement common to STN LCD displays. In contrast, VFDs position their display surface further back within the device, and the presence of sealing and grid frames can constrict the available viewing angles.