Konica Minolta Sensing Americas Light Trends and Technology Newsletter
Post-Lunch Dip   Imaging Photometer
Using Light Exposure to Combat the “Post-Lunch Dip”   What is an Imaging Photometer?
Researchers at the Rensselaer Polytechnic Institute ("RPI") in the Lighting Research Center have discovered a way to combat the drowsy feeling often experienced in the afternoon (known as the “post-lunch dip”) using a novel method: exposure to visible light. For years, researchers have known that exposure to certain wavelengths of visible light helps prevent production of melatonin, a chemical responsible for drowsiness. Short wavelength blue light striking the retina is known to suppress the production of melatonin, while long wavelength red light has no effect on melatonin production.
An imaging photometer, often called a 2D Color Analyzer, is a device designed to measure luminance and color values across an entire image frame as opposed to one spot on an image. It works similar to a digital camera in that a light emitting object, such as a television or display, is focused through a lens on the photometer, and the focused image is captured in a device by a CCD. The CCD converts light into a digital signal and assigns luminance values to each individual pixel of the acquired image. This means that once an image is taken, the device will provide a number of luminance data points equal to the pixel count of the image.
How are TVs Tested?
  OLED Display Technology
Blog: How Are TVs Tested?   OLED Display Technology
Testing television display quality is a technically challenging process. Because so much of what we think of as quality is really a matter of perception, and because everyone sees things differently, the television and the television review industries have not only had to develop a series of quantifiable traits to measure, and a strict set of procedures for testing those traits; they have had to develop specialized equipment and train technicians to become experts in using that equipment. The most important device for testing TV display quality is a chroma meter, a special device that detects and measures light from almost any source, including plasma screen displays, LCD displays, and projection televisions.
Organic light-emitting diodes (OLEDs) are LEDs that work based on the electroluminescent properties of thin film organic compounds when they are placed between two electrodes. Generally, the well-known technology of LCD displays has dominated the cell phone display market, but we are now beginning to see OLED displays that can compete with their LCD counterparts at the same price level. Exciting new research into OLED fabrication techniques means that OLED displays are rapidly improving and becoming cheaper to produce. Unlike LCD technology, OLED displays do not require a backlight to operate. This means that display manufacturers have the potential to make extremely thin displays using OLED technology.

May 2013 Edition
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