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Calculating of the heat dissipation of a LED - Physics Forums Welcome to PF At best, you can expect about 20% quantum efficiency from an LED The heat will therefore be greater than 80% of total power input You must run the LED cool for high efficiency, and for long life That suggests you should design for 100% heat generation Vf = 2 85 V If = 700 mA Maximum heat generation is 2 85 * 0 7 = 2 0 watt At best, that might be a 20% overestimate
How many LEDs are in a typical LED monitor? - Physics Forums A single pixel only puts out one color (red,gree or blue) groups of three or four pixels are used to give all the colors by varying amounts of these primary colors ps There are purely LED display screens used for large outdoors screen such as in stadiums - these do use groups of LEDs in each pixel to give either a red, green or blue light
Observing Emission Spectra from Computer Screens If you are looking at an LED screen, the emissions are from LEDs (obviously) which produce bands rather than lines If you are looking at a TFT screen, then, in those I've seen, the light comes from a flourescent tube You might imagine you're onto a better bet here, because fluorescent gases do emit line spectra
How to change the color of an LED? - Physics Forums Welcome to the PF It's not likely you can change the color of that display White LEDs are more expensive than single-color LEDs, so it's unlikely they would use them in their display Instead, just look for another display with the desired backlight color
Strange glow from TV that is off. - Physics Forums Place your hand against the television screen, with the television off but the lights in the room on Close your eyes and cover them with your free hand so that you will have good night vision when the lights go off Turn off the lights, remove your hand from the screen, and look at the screen You will see a ghostly after image of your hand there
My TV Cracks: Is It Heat or Discharge? - Physics Forums When you say flat screen, it doesn't mean much Do you mean LCD, or Plasma, or flat face CRT If it is LCD, is it LED backlight, or CCFL (CCFL is high voltage) CRT based systems will arc ocasionally, especially after years of gathering dust Open it up and blow out the dust Same for the flat screen (actually, you might just try blowing out the dust through the vent holes
Holographic Display with Rotating Blades - Physics Forums Video: I recently happened upon this holographic display design where a number of blades with led strips affixed rotate like a fan It quite puzzles me how this such a design achieves the desired results I am pretty confident that they use polar coordinates when mapping the pixels, but I am
Debunking the Myth: Do LED Lights Flicker? Get the Definitive Answer Here! Many consumer products are use a LED Driver circuit, which is high frequency (PWM) control of the current in the LED to provide maximum perceived brightness Especially noticeable on some automobile tail and brake lights So they definitely flicker
How Do Optical Mice Detect Movement? - Physics Forums from how stuff works: most optical mice use a small, red light-emitting diode (LED) that bounces light off that surface onto a complimentary metal-oxide semiconductor (CMOS) sensor In addition to LEDs, a recent innovation are laser-based optical mice that detect more surface details compared to LED technology