VESA
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VESA (Video Electronics Standards Association) (Pronunced: \ˈvā-sə\) is an international standards body for computer graphics founded in 1989 by NEC Home Electronics and eight other video display adapter manufacturers.
VESA's initial goal was to produce a standard for 800×600 SVGA resolution video displays. Since then VESA has issued a number of standards, mostly relating to the function of video peripherals in personal computers.
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[edit] Standards
- VESA Feature Connector (VFC), obsolete connector that was often present on older videocards, used as an 8-bit video bus to other devices
- VESA Advanced Feature Connector (VAFC), newer version of the above VFC that widens the 8-bit bus to either a 16-bit or 32-bit bus.
- VESA Local Bus (VLB), once used as a fast video bus (akin to the modern AGP).
- VESA BIOS Extensions (VBE), used for enabling standard support for advanced video modes (at high resolutions and color depths)
- Display Data Channel (DDC), allowing monitors to identify themselves to the video boards they're attached to. The format of the actual identification data is however called extended display identification data (EDID).
- VESA Display Power Management Signaling, which allows monitors to be queried on the types of power saving modes they support
- Digital Packet Video Link (DPVL), a display link standard that allows to update only portions of the screen
- VESA Stereo, a standard 3-pin connector for syncronization of stereoscopic shutter glasses
- Flat Panel Display Interface (FPDI), logical and electrical standard for flat panel display interfacing.
- Flat Display Mounting Interface (FDMI), which defines "VESA mounts"
- Generalized Timing Formula (GTF), video timings standard
- Coordinated Video Timings (CVT), a replacement for GTF
- Display Monitor Timing (DMT), lists standard display timings for various resolutions and screen sizes
- VESA Video Interface Port (VIP), a digital video interface standard.
- DisplayPort Standard, a digital video interface standard.
- VESA Enhanced Video Connector - an obsolete standard for reducing the number of cables around computers.
[edit] Criticisms
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VESA has been criticized for their policy of charging for published standards. VESA charges non-members for some, but not all, of their published standards. Some people believe the practice of charging for specifications has undermined the purpose of the VESA organization. According to Kendall Bennett, developer of the VBE/AF standard, the VESA Software Standards Committee was closed down due to a lack of interest resulting from charging high prices for specifications.[1] At that time no VESA standards were available for free. Although VESA now hosts some free standards documents, the free collection does not include newly developed standards. Even for obsolete standards, the free collection is incomplete. As of 2010, current standards documents from VESA cost hundreds, or thousands, of dollars each. Some older standards are not available for free, or purchase.[2] As of 2010, the free downloads require mandatory registration.[3] While not all standards bodies provide specifications freely available for download, many do including: ITU, JEDEC, DVI, and HDMI (through HDMI 1.3a).
At the time DisplayPort was announced VESA was criticized for developing the specification in secret and having a track record of developing unsuccessful digital interface standards including Plug & Display, and DFP[4]
[edit] References
[edit] External links
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