How many LED's are in a typical LED monitor? - Physics Forums
2010年5月19日 · How many LED's are typically used in a LED monitor? The number of LED's used in a LED monitor can vary depending on the size and resolution of the monitor. However, on average, a 24-inch LED monitor may have around 1,920 LED's. What is the purpose of using LED's in a monitor? LED's are used in a monitor as a light source for the display panel.
Calculating of the heat dissipation of a LED - Physics Forums
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%.
Strange glow from TV that is off. - Physics Forums
2004年7月9日 · 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.
Create a focused beam angle of LED light using reflection
2019年6月7日 · Angle Beam Led Lens Light Reflection In summary, if you are looking to redirect the majority of light from your LED source, using a traditional lens or surface may not be the best option. A parabolic reflector could be an effective lens if you have a narrow beam angle and are okay with efficiency losses.
On Mixing Colors of Light - Physics Forums
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.
On Mixing Colors of Light | Page 6 - Physics Forums
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 ...
On Mixing Colors of Light | Page 4 - Physics Forums
2024年10月16日 · Edit: I anticipate when you type in 580 nm or 590 nm into this program and get yellow on your screen, it is actually coming from a combination of a red LED and a green LED, with wavelengths (perhaps somewhat broadband) …
Collimating incoherent light emitted by a LED - Physics Forums
2012年11月22日 · In summary, the conversation discusses the best method to collimate light from a LED with minimal loss of light intensity. The emitter has an area of 12mm^2 and a maximum divergence angle of 80°, and the desired beam diameter is 5-10mm. The person has tried using an aspheric condenser lens but still experiences significant divergence.
What is causing the LED to light up when touched without a direct ...
2012年1月31日 · An LED lights up when i touch it. One leg is attached to a piece of metal, other is the one i touch. Polarity does not matter. Amount of metal maters - table frame makes it full bright, half-meter steel ruler makes it dim, a piece of wire makes it just visible. Touching that piece of …
Spectrometer Shows More Blue light on cloudy Day....why?
2024年12月21日 · This is sort of a sister thread to my other thread. But I've bought a spectrometer and have been playing around with it. I pointed it at the sun on a clear day and got as expected a nice full spectrum of color with a large spike of blue: 1. My first question is.. is the spike in blue range...