# field emission display

> type of display

**Wikidata**: [Q971766](https://www.wikidata.org/wiki/Q971766)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Field-emission_display)  
**Source**: https://4ort.xyz/entity/field-emission-display

## Summary
A field emission display (FED) is a type of electronic flat-panel display device. It utilizes field emission technology to generate light, differing from traditional LCD or OLED methods by employing cathodes to directly emit electrons towards phosphors.

## Key Facts
- Classification: FED is a subclass of flat-panel display.
- Primary Alias: Commonly abbreviated as FED.
- Wikimedia Presence: Has 17 sitelinks and is titled "Field-emission display" on Wikipedia.
- Wikipedia Multilingual: Available in 11 languages: ar, ca, de, en, es, et, fr, id, it, ja.
- Academic Identifier: Microsoft Academic ID (discontinued): 169942996.
- Commons Category: Listed under "Television technology".
- Freebase ID: /m/03pw9m (referencing Q15241312, sourced 2013-10-28).
- Core Description: Defined as a "type of display".

## FAQs
### Q: How does a field emission display work?
A: A field emission display works by using field emission cathodes to release electrons. These electrons are accelerated towards phosphor-coated anodes, causing the phosphors to emit light and form an image.

### Q: What are the main advantages of FED technology?
A: Based on its classification as a flat-panel display, FED offers a thin form factor. Potential advantages include high brightness, wide viewing angles, and potentially lower power consumption compared to some older display types, though specific performance metrics are detailed in the core technical literature.

### Q: How is FED different from LCD or OLED displays?
A: FED fundamentally differs from LCD (which uses liquid crystals and a backlight) and OLED (which uses organic materials that emit light when electricity is applied). FED relies on the emission of electrons from cold cathodes (field emission) to strike phosphors and generate light, a distinct underlying technology.

### Q: Where is field emission display technology used today?
A: While FEDs were explored for applications like large-area displays and televisions, widespread commercial adoption faced challenges. Research and development have largely shifted, though the technology remains a notable type within the flat-panel display category.

## Why It Matters
Field emission display technology represented a significant exploration within the evolution of flat-panel displays. It offered an alternative path to achieving thin, lightweight screens by leveraging the principle of field emission for electron generation. Its development pushed the boundaries of display physics, highlighting different approaches to achieving high brightness and potentially different performance characteristics compared to dominant technologies like LCDs. Understanding FED is crucial for appreciating the historical landscape of display innovation and the diverse technological solutions pursued for creating efficient, high-quality visual output.

## Notable For
*   Being a specific type of flat-panel display technology distinct from LCDs and OLEDs.
*   Utilizing the principle of field emission from cathodes to generate electrons for phosphor excitation.
*   Representing a significant, albeit ultimately less commercially dominant, branch in the development of flat-panel electronic displays.
*   Possess a dedicated multilingual presence on Wikipedia and specific academic identifiers.

## Body
### Classification and Overview
*   FED is explicitly defined as a **type of display**.
*   It is a **subclass of flat-panel display**, sharing the core characteristic of a thin, flat form factor.
*   Its primary **aliases** are "FED" and "Field Emission Display".

### Technical Foundation
*   The core technology involves **field emission**, where electrons are emitted from cathodes under a high electric field.
*   These emitted electrons are then accelerated towards **phosphor-coated anodes**.
*   The collision of electrons with the phosphors causes them to **emit light**, forming the visible image.

### Related Entities
*   **Parent Class**: flat-panel display (electronic display device in a flat form factor, with 33 sitelinks).
*   **Commons Category**: Television technology.
*   **Wikipedia Languages**: Available in ar, ca, de, en, es, et, fr, id, it, ja.
*   **Academic ID**: Microsoft Academic ID (discontinued): 169942996.

## References

1. Freebase Data Dumps. 2013
2. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)