Projection & AV Project
The moving image ends up on a screen or a display. Projectors, presentation equipment, resolutions and connections (HDMI and others) decide whether a well-prepared picture loses something on location.
- projectors
- video projection
- presentation equipment
- display standards
- AV systems
- resolution
- HDMI
- video signals
What this section answers
- How many lumens does a meeting room need?
- How do I work out projector distance?
- Which HDMI version and which cable for 4K60 HDR?
- Why can’t the projector ‘see’ the laptop?
Articles and tools
Quick reference
| version | max. bandwidth | example format | certified cable |
|---|---|---|---|
| 1.4b | 10.2 Gb/s | 4K24/30, 1080p120 | High Speed |
| 2.0 | 18 Gb/s | 4K50/60 | High Speed / Premium High Speed |
| 2.1 | 48 Gb/s | 4K120, 8K60 | Ultra High Speed |
| 2.2 | 96 Gb/s | 4K240, 8K60 4:4:4 | Ultra96 |
Throw ratio (ISO/IEC 21118) = distance ÷ image width. Lumens according to the standard = average of 9 points (lx) × area (m²).
Terms
- Light output lumens
- According to ISO/IEC 21118, the average illuminance at 9 points of a full-white image (lux) multiplied by the image area in m². More
- Throw ratio
- Projection distance divided by image width. A ratio of 0.5 means a 2 m wide image is produced from 1 m away.
- Contrast ratio full on/off
- The ratio of the illuminance of a full-white and a full-black image. With projectors it depends heavily on the ambient light in the room.
- Lens shift
- Optically moving the image up, down or sideways without keystone distortion, unlike digital (keystone) correction.
- HDMI High-Definition Multimedia Interface
- A digital interface for uncompressed picture, multichannel audio and control data over a single cable. More
- eARC Enhanced Audio Return Channel
- The HDMI audio return channel from a TV to an amplifier or soundbar, with support for advanced audio formats.
- EDID Extended Display Identification Data
- Data with which a display tells a source which resolutions and formats it supports. A common cause of ‘no picture’ in AV systems.
In preparation
Topics we are working on. They are not published yet — we would rather have fewer pages, but verified ones.
- Screens: gain, ALR screens, sizes
- Laser, LED and lamp: projector light sources
- HDBaseT and video over IP
- DisplayPort and USB-C in presentation systems
- Designing a small meeting room: a checklist
- EDID and HDCP in AV systems in detail
Sources for the tables
Checked .