2022年6月1日 · What I need is basically the luminous efficacy of the LED (luminous flow/radiant flow). At this point I am quite sure the provided data in the datasheet is not enough to calculate that number. My rough estimate of those LED is a luminous efficacy of 300lm/W which results in a energetic efficacy of roughly 40%.

2010年5月19日 · For an LCD TV the backlight LED gives you the ligth source - the only reason for using LEDs rather than flourescent lamps is the smaller size, greater efficency and longer life. 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.

2006年1月18日 · In addition to LEDs, a recent innovation are laser-based optical mice that detect more surface details compared to LED technology. This results in the ability to use a laser-based optical mouse on even more surfaces than an LED mouse. Here's how the sensor and other parts of an optical mouse work together:

2024年1月24日 · Searching on this problem led me to a suggestion: switch back from Wayland to X11. (At this point I have only a vague idea what those are, except that they draw the windows and stuff on my screen). The screen capture program began to work right away, and then I remembered the other two apps named above.

2023年8月16日 · The main attributes I'm interested in is resolution and brightness. I know that a higher resolution requires less beam current since less electrons means less repulsion, but say I wanted to fit a resolution of 3840x2160 into a 34 inch screen, this is a much higher beam current per area than any crt I've heard of.

2025年1月27日 · What is the input voltage and current specified on the datasheet for your LED strip? Do you know how to build/use buck and boost DC-DC converters? Monday, 11:21 PM

2024年10月16日 · For me I did know about the red,blue, and green LED's of a TV screen, (I've seen them with a magnifying glass), but as you can probably see by reading my OP above, I hadn't previously thought too much about any additional details, and hadn't previously seen any in-depth discussions on the subject such as the one from PF that I linked in post 9.

2025年1月14日 · So I set up about 30 Actions in PS. When the image is ready to export, I bring the selection rectangle on screen, select the relevant Action, click Play, and the export is done. No mistakes, no thinking. However, if an image has to be rotated, that would have to be done before the Action. I'd have to… Bring the selection into play

2009年7月25日 · Also fun: playing with an optical chopper to produce visual difference frequencies. Tune the chopper to a multiple of 60 Hz and look at an analog oscilloscope screen through it, and you see a number of stationary dark regions on said screen. Detune it a little bit, and that region flickers at a rate given by the difference frequency.

2024年10月16日 · I don't recall such a topic "Mixing light colors" in theoretical physics, but in 2014 the Nobel Prize in Physics was awarded for the invention of the blue LED, and there you might find some related topics that can be explored without being accused of drifting apart from mainstream physics, such as how a photon is produced, the energy of a ...