VESA

The Video Electronics Standards Association (VESA ) is an organization in which around 200 member companies (as of July 2013) have joined forces in order specifically to create uniform specifications of video standards in the field of computer graphics. It is one of the largest industrial standardization organizations.

VESA became known. Mainly by specifications for the VESA BIOS Extension and by definition of the VESA Local Bus ( VLB) for IBM - PC compatible computers With DPMS, Video Input Port (VIP) and DFP techniques resulted in more fields of activity for the VESA. Further, the VESA by definition of so-called VESA modes for the timings of the display control signals and the General Timing Formula associated ( GTF) is still of great importance to the standardization of parts of the computer technology. Furthermore, it was the DDC ( Display Data Channel ) standard and knotted it Extended Display Identification Data (EDID ) specification laid down by VESA. With the standardization of the DVI -D and DVI-I connection techniques for digital video data was also involved. Even newer standards such as HDTV can be anticipated co-influences of the VESA. Recent proposals for the standardization of August 2005 advocating the DisplayPort, which is based on PCI Express technology. Similar to HDMI high-definition video and audio signals can be encrypted and transmitted uncompressed over a single cable to a screen.

The VESA shows, among other presence through presentations at the annual SIGGRAPH show.

Display VESA timings of the

In the 1980s, there were various types of computers and graphics standards, of which almost any a compatible screen, or at least an adapter required. VESA came up with the idea to standardize the interface between the computer and monitor; so the two devices could develop independently. Thus, the computer that sends the video signal, and the screen that receives the video signal understand, both sides must use the same signal, the same rules for the timing (timing) follows.

Display Monitor Timing ( DMT)

In the first approach a VESA standards a list of resolutions, color depths and refresh rates was created, the respective associated time values ​​- contains - the timing. Despite a recent method of a formula for the dynamic calculation of the timing of this display monitor timing -called list of VESA still maintained. The end of 2008 was the latest DMT issue "revision 11 " of May 2007.

General Timing Formula ( GTF)

The screen industry developed rapidly. Rather than build screens with fixed timings, the controls of the CRT monitors were flexible and had a variety of different resolutions to. Instead take all possible resolutions and timings in the DMT table, VESA 1996 began to market a formula that allowed to calculate from a desired resolution and refresh rate, the required timings.

The General Timing Formula wore the technological framework bill then known. For example, the horizontal resolution must be divisible by eight, the horizontal sync pulse should be eight percent of the screen line length.

The GTF specification is not freely available. An open -source program, however, is able to calculate the timings to GTF.

Coordinated Video Timings (CVT )

The screen industry step forward. The tube screens were increasingly replaced by LCD or plasma screens. The CRT monitors required at the end of the picture for a certain time until the electron beam was moved from bottom right to top left. This blanking interval called pause is technically superfluous in LCD screens and can be saved with Reduced blanking.

The information technology and entertainment technology merged more and more: The digitization of television sets and the resolutions used there (720p, 1080i, ...) and aspect ratios were (eg 16:9 formerly widely held in the world of IT 4:3) interesting for the IT industry. Therefore, the VESA 2003 decided that GTF adapt to the new conditions and designed to a GTF based, refined CVT formula.

CVT encodes the aspect ratio of the signal (the length of the vertical Synchronistionspulses specifies the aspect ratio, eg 4 lines → 4:3 → 16:9 ... 5 lines ), and whether the video signal is "normal" Röhrenaustastzeiten used or shortened LCD blanking, is controlled by the polarity of the sync pulses ( H / V → normal, H / V → shortened )

The CVT specification is not freely available. An open source program is, however, capable of the video timings by CVT ( and GTF) to calculate.

Future

Even CVT still has the limitation that the horizontal resolution must be divisible by eight. This could be currently so avoid that these new resolutions to be included in the DMT table. If not only video but also audio signals to be transmitted with the signal, the computed video timing tolerate not optimal with the timings used in the audio world. Recent developments account for this, by also involve the new requirements and conditions.

Fortifications of flat panel displays

The VESA Flat Display Mounting Interface ( FDMI ) is a standard for fixtures of flat screens on walls, ceilings, tables, or vehicles, which provides for a minimum of 4 threads for bolts depending on size and weight of the screen: By October 2002, this standardization was under the name Flat panel Monitor Physical Mounting interface ( FPMPMI ) out.

The variants of the FDMI are manifold and start at 4 threads with intervals of 50 and 20 mm in 5 different configurations. To name in data sheets syntax is provided, which begins with VESA, followed by MIS for mounting interface standard, the relevant part of the standard and the applicable options for this part. The following rules regarding the screen size and the maximum total mass assigned to the individual parts:

• Part A: Open, future developments;
• Part B: 10.2 to 20.2 cm screen diagonal; max. 2 kg
• Part C: 20.3 to 30.4 cm screen diagonal; max. 4.5 kg
• Part D: 30.5 to 58.3 cm screen diagonal; max. 14 kg
• Part E: 58.4 to 78.6 cm screen diagonal; max. 22.7 kg
• Part F: 78.7 to 228.6 cm diagonal screen; max. 113.6 kg

VESA MIS- D 100 C

VESA MIS- D 100 L / R

VESA MIS- E 200 C