page loader

Knowledgebase Knowledgebase

The A-Z of Data/Video Projection


Essential Background Information


Below you will find a brief introduction to the various technologies which are incorporated in our range of projectors as well as an explanation of the most important terms.

1. TFT LCD Technology - Single TFT


Projection system with single TFT displays are especially suitable for the presentation of data. The TFT (thin film transistor) active matrix technology is characterized by good and clear image reproduction achieved by means of the following technology:
On the surface of the display there are so called pixels, each containing three color transistors. Each of these transistors reacts extremely quickly and projects one of the three basic colors red, green and blue which vary in the light transmission process.

2. Polysilicon LCD Technology


This technology is based on three small single displays of a[[proximately 0.9" or 1.3" in the basic red, green and blue colors. These displays are extremely light trans missive and the color representation extremely bright, particular in conjunction with a metal halide lamp.
Data and video projectors with polysilicon technology either her have a manual or a motorized zoom lenses, which enables extremely flexible usages, either in-house or in the field. The presentation possibilities range from simple text presentation to sophisticated multimedia applications.

3. DMD/DLP Technology


The DMD/DPL (Digital Light Processing) technology development by Texas Instruments contains hundreds of microscopically thin mirrors (the size of 1/1000 of a human hair) on a semiconductor chip that are controlled electronically. By Means of newly development control electronics, the reflected projection light for each pixel is focused either onto the optical system or to the "offside" which finally produce the picture. The color is produced by a three color filter wheel rotating 'in sync' with the picture control three separate color images are produced, one by one, which appear as one true colour picture due to the high velocity. With this technology the pixel structure can almost not be identified. Bright images and an even spread of light are other features of this new technology.

A Word on the Projection Lamp


The light source of an LCD Projection system can either be a halogen or a metal halide lamp. Images thar are projected with a halogen lamp appear somewhat yellowish. As a consequence, the audiance can look for a longer period of time at graphic and text presentations as the picture will have a "warm" effect.
Projection systems with a metal halide lamp have a very neutral color display. The impression of the images is rather "cold". However, this is important for the presentation of graphics, charts, pictures and multimedia applications and video film projection. The newly developed high-performance lamps(i.e UHP or UHE) contribute significantly due to their long lifr span, consistent brightness as well as low power consumption.
ANSI Lumen:
Unit of measurement for the brightness of LCD projectors based on ANSI(American National Standards Institute). An ares of m square on a screen is divided into 9 equally sized rectangles. The mathematical average of the light intensity in the center of each area equals the ANSI lumen value.
Auto Setup/ Auto Synch:
The projector recognizes the connected source and automatically adjusts itself.
Band Width:
Indicates the frequency range (in Hertz) which a signal needs for transmission.
BNC:
A popular connector used by video professionals with excellent mechanical performance.
CE:
Certification seal mandatory for al electrical and electronic equipment sold in the EU since 01.01.96. Indicates the electromagnetic compatibility of the appliances.
CRT Projectors:
Also called "Beamers". 3-tube-projectors for permanent ceiling mounting. Unlike LCD projectors, CRT projectors are significantly heavier, more expensive and more difficult to adjust.
Freeze:
"Freeze" the current image to enable programmer changes without viewers noticing.
Horizontal Frequency:
Indicates how many lines can be controlled per second(in kHz).
Image Repetition Frequency:
Indicates how many images per second an be displayed on the monitor(in Hz)(Vertical frequency).
IR Mouse-remote control:
The computer mouse can be controlled via the remote control of the projector.
Keystone Correction:
Even when projecting upwards, the borders of the projected image will remain parallel which guarantees optimal readability.
Jack:
Socket which is used primarily for head sets and microphones, partially also for audio or video.
Compression:
Many projectors re able to display higher resulations than they actually have. Columns and lines are simply skipped. Since the picture quality is affected, several manufacturers have developed special compression methods. These methods compress with only the slightest loss of information.
Contrast:
Indicates the ratio of black and white in an image. The higher the value the more contrast and focus the image has.
Convergence:
The congruence of the 3 LCD panels (red, green, blue) in a projector. Images appear to be fuzzy with poor convergence and color lines are visible around latters.
Image Repetition frequency:
Indiactes how many images per second can be displayed on the monitor(in Hz).
LCD:
"Liquid Crystal Display"
Manual Zoom:
The size of the image diagonal is adjusted manually at the lens.
Motorized Zoom:
The size of the image diagonal can be adjusted via infrared remote control independent of the location of the projector.
OSD:
On Screen Display is inserted into the projected image showing all current values such as source brightness, contrast etc.
PCMCIA:
"Personal Computer Memory Card International Association". International standard committee for credit card sized add-on cards for notebooks and digital cameras. Apart from memory cards there are also modem-, sound and video cards PCMCIA format.
Phonon:
Popular connector for the transmission of video - and audio signals.
Pixel:
"Picture Element". Smallest trigger able image part.
Pixel Frequency:
Number of triggered pixels per second.
RS 232:
Interfaces providing a control of the LCD projector via PC or control utilities such as AMX or Crestron.
Rear Projection:
For reserved projection in transmitted light mode. Requires special rear projection screens.
Resolution:
Amount of pixel in horizontal and vertical direction. A better image is achieved the more closely the data source's and projector's resolutions are synchronized
SCART:
Also called EURO AV connector. The maximum 21 pin cable transmits all audio and signals with only one connector. SCART is also suitable for S-Video.
Smart Media Card:
Extremely small memory card used with digital cameras. Smaller and cheaper than PCMCIA-memory cards.
SVGA:
"Super Video Graphics Array". Graphics standard for PCs with a maximum resolution of 800x600 pixels.
S-Video:
High quality video signal, where the light signals are separated from the signals. DIN 4 pin connectors, i.e. used with S-VHS recorder.
SXGA:
"Super Extended Graphics Array". Graphics standard with a maximum resolution of 1,280 x 1,024 pixels.
USB:
"Universal Serial Bus". Standard interface under Windows 98. Replaces serial, parallel and other interfaces on the PC. Hardware components are automatically detected, configured and are instantly available when connected to the PC.
UXGA:
"Ultra extended Graphics Array". Graphics standard for PCs with a maximum resolution of 1600 x 1200 pixels.
Vario focal lens:
The projected image diagonal depends on the distance between the projector and screen.
Vertical Frequency:
Indicates how many images per second can br displayed (in Hz).
VGA:
"Video Graphics Array". Graphics standard for PCs with a maximum resolution of 640 x 480 pixels.
Workstation:
Extremely powerful and fast PC based on single or multiprocessor architecture to cope with number crunching tasks(i.e. CAD/CAM applications).
XGA:
"Extended Graphics Array". Graphics cards with a resolution of maximum 1.024 x 768 pixels.

THE A-Z OF DATA/VIDEO PROJECTION AND PLASMA TECHNOLOGY


16:9 Conversion:
Movies are recorded by means of special camera technology (anamorphic), which compresses the image width. To display the right format, the correction can either be made on DVD player or on the projector. We recommended that the conversion is carried out via a 16:9 format conversion inside the projector.
ALIS:
'Alternate Lighting of Surfaces': A technology for Plasma Displays to improve the image quality by doubling the lines.
ANSI Lumen:
Unit of measurement for the brightness of LCD projectors based on ANSI (American National Standards Institute). An Area of 1 sqm on a screen is divided into 9 equally sized rectangles. The mathematical average of the light intensity in the center of each area equals the ANSI lumens value.
Auto Setup/ Auto Synch:
The projector recognizes the input source and automatically adjusts itself.
Image Repetition Frequency:
Indicates how many images per second can be displayed on the monitor (in Hz) (vertical frequency).
BNC:
A popular connector used by video professional which produces excellent performance. Workstations have BNC cables with 5 connectors: one each for the three basic color red, green and blue and one each for horizontal and vertical synch.
Jack:
Socket, which is used primarily for video and audio signals.
DLP:
"Digital Light Processing". Technology development b Texas Instruments that uses electronically adjusted mirrors (each the size of 1/1000 os human hair) to project light from the projection lamp onto screen.
DVI:
"Digital Visual Interface" is a new transmission standard that enables the digital transfer of computer data to a monitor, plasma display, projector etc. As there is no conversion to an analogue signal, the image quality improves significantly.
Freeze:
"Freeze" the current image to enable programmer changes without viewers noticing.
Horizontal Frequency:
Indicates how many lines can be controlled per second(in kHz).
IR Mouse-remote control:
The computer mouse can be controlled via the projector's remote control.
Keystone Correction:
Ensures a parallel image even when projecting upwards. Some advanced projectors now offer a horizontal keystone correction, which means that the projector does not necessarily have to be positioned at right angels to the screen.
Component Signal:
Also described as color difference - or YUV signal. The video signal is split into one brightness and two color difference signals, which are transferred separately. The image quality of the component signal is better than S-Video and therefore is employed frequently e.g. for the connection to DVD-players
Compression:
Many projectors re able to display higher resolutions than they actually have. Columns and lines are simply skipped. Since the picture quality is affected, several manufacturers have developed special compression methods. These methods compress with only the slightest loss of information.
Contrast:
Indicates the ratio of black and white in an image. The higher the value the more contrast and focus the image has.
LCD:
"Liquid Crystal Display"
Manual Zoom:
The size of the image diagonal is adjusted manually at the lens.
Motorized Zoom:
The size of the image diagonal can be adjusted via infrared remote control independent of the location of the projector.
OSD:
On Screen Display is inserted into the projected image showing all current values such as source brightness, contrast etc.
Pixel:
"Picture Element". Smallest trigger able image part.
Plasma Display:
A relatively new display technology. Each pixels consists of one tiny chamber which is filled with noble gas. This mixture of noble gas is lit but electronics. The emerging ultra-violet radiation stimulates the phosphor layer to illuminate.
Portrait Mode:
Plasma Displays are usually mounted horizontally or in the landscape mode. Some models can also be mounted vertically (portrait). For this type of application, either an additional special graphic card has to be used or the video material must already be in a portrait format.
Progressive Scan:
It continues scanning of video signal consisting of two semi-frames. Both semi-frames are put together to complete one frame. This allows the reproduction of fine structures.
PSI:
"Polysilicon" the material of image elements of an LCD projector. The light transmission can be controlled by electronic signals.
RS 232:
Interfaces providing a control of the LCD projector via PC or control utilities such as AMX or Crestron.
Rear Projection:
For reserved projection in transmitted light mode. Requires special rear projection screens.
Split-Screen:
Some plasma displays have an in-built split-screen function that allows the interconnection of several plasma-displays to one large plasma screen. Each plasma display shows one part of the total image.
Resolution:
The amount of horizontal and vertical pixels. The closer the data source's and projector's resolutions are synchronized the better the image.
SVGA:
"Super Video Graphics Array". Graphics standard for PCs with a maximum resolution of 800x600 pixels.
S-Video:
High quality video signal, where the light signals are separated from the signals. DIN 4 pin connectors, i.e. used with S-VHS recorder.
SXGA:
"Super Extended Graphics Array". Graphics standard with a maximum resolution of 1,280 x 1,024 pixels.
USB:
"Universal Serial Bus". Standard interface under Windows 98. Replaces serial, parallel and other interfaces on the PC. Hardware components are automatically detected, configured and are instantly available when connected to the PC. Currently only usable fpr the mouse interface with projectors.
UXGA:
"Ultra extended Graphics Array". Graphics standard for PCs with a maximum regulation of 1600 x 1200 pixels.
Vario focal lens:
The projected image diagonal depends on the distance between the projector and screen.
Vertical Frequency:
Indicates how many images per second can br displayed (in Hz).
Yuv:
Component signal.
XGA:
"Extended Graphics Array". Graphics cards with a resolution of maximum 1.024 x 768 pixels.