Integrating Display Video Wall
Display Wall Legibility
The concepts of text legibility and screen brightness are critical components to successfully integrating large format display video wall technology into an operations center.
Selecting Resolution for Room Size
A standard eye chart found in a doctor’s office helps demonstrate the significance of legibility on a display wall. Obviously, some rows are more legible than others. The first row, “E”, is very easy to read while the bottom row is much more difficult and requires more effort to comprehend.
The ease of reading text from a long distance directly relates to the size of that text. Since a 12 pt font is equal to 16 pixels, the resolution of the projection cube will directly relate to how large the text is. The images to the left represent the difference in text size on a XGA resolution display versus a SXGA+ resolution display.
Clearly the texts in the two boxes are different sizes, although the font pitch is the same. When viewing this text on a monitor both text sizes are legible, however as you move further back you will notice that the text size appears smaller when shown on the higher resolution display.
Mitsubishi Electric can help you define the appropriate display resolution for your environment.
The correct brightness of the display wall needed to maintain information recognition while reducing eye strain for the control room operators is an important factor to consider during the design of a control room or operations center. Factors such as room and ambient lighting, seating positions and viewing angles all influence the levels at which the display wall brightness shall be set. Mitsubishi Electric rear projection cubes and super narrow bezel LCD monitors offer multiple screen brightness levels to accommodate the needs of your control room.
What is DLP® Technology?
DLP®, or Digital Light Processing™, is a display technology created by Texas Instruments. With 650,000 hour MTBF and consistent performance, it is the industry-standard display technology used for 24 hour / 7 day a week operation.
At the heart of this system is the Digital Micromirror Device™ (DMD™), which uses hundreds of thousands of microscopic mirrors to generate images on the display screen. Because the image generating DMD™ chip is a 100% reflective technology as opposed to transmissive, it is able to withstand a tremendous amount of heat and light. This ensures that the display maintains the same superb image quality throughout the life of the unit.
There are two different kinds of DLP® technology available: Single Chip and Three Chip. For rear projection cubes technology, Single Chip DLP® technology is utilized because of the space and cost constraints of a tiled display wall.
A Single Chip DLP® lamp-based projection engine utilizes four main components: Light Source, Color Filter, DMD and Projection Lens. The light source,which can be lamps or LEDs, generates the light necessary to project an image on a screen. The Color Filter, also referred to as a Color Wheel, generates color by filtering the white light generated from a lamp-based light source. The DMD is a monochromatic imaging device, so the color wheel adds red, green and blue light to sequentially generate each primary color. This occurs rapidly giving the appearance of a full color image. Nowadays, newer projection engines use LED light sources that do not require the use of a color filter since there are individual red, green and blue LEDs, which working together create all of the colors necessary for image reproduction on a display wall.