1/1/2024 0 Comments Led projector retrofit![]() No matter how you mix those narrow bands, you will be missing all the wavelengths in between them, which makes the color look muddy to the human eye (which is actually being tricked into seeing a color that does not exist). This is due to LEDs producing only a narrow band of wavelengths. If you have ever mixed Red, Green and Blue LED light to make white, you will know how bad it looks. That all being said, I believe that this would look HORRIBLE in respect to color rendering. However, if there is a red, a blue, and a green LCD, putting a colored filter in front a similarly colored light will have no effect, so it would only make sense to begin with a white source. However, in thinking about it, this really depends on whether the LCDs are colored or black. Assuming his projector splits the single source light into three beams which are then filtered with RGB LCDs and then put back together, it would be easier to make three separate reflectors, one for each color. ![]() ![]() the diffusion through the uneven potting compound and phosphor in these only makes it – If he were to use separate Red Blue and Green LEDs, there would be no reason to cluster them in the same housing. this is why projection lenses use an arc around a mm wide. now when you move inside into a comercial building and the 30 odd light bulbs in the room scattered around the place are now giving you multiple blurred overlapping shadows. think of it like if you were to stand in the sun, look at your shadow and see the perfect outline. total output of the projector is now 4% before loses with 96% of the light just being scattered and ruining the image. so what you’re doing is using a single led from the array as your focussed light source with, in his case, using 24 other LEDs as essentially noise. you can use a fly eye lens or flared fibre optic collimator to focus it. a projection light source needs to be a focused point. The reason this is such a stupid mod, and I must admit, I tried it my first time around just because I had seen so many people do it and claim excellent results but it was awful. Posted in home entertainment hacks, LED Hacks Tagged lcd, led, projector, retrofit Post navigation He has plans to source some far brighter LEDs or automobile HID lighting in the very near future, and we look forward to seeing if he can match the brightness of the original bulbs. His bulb replacement works well as far as color fidelity is concerned, but is not nearly as bright as he hoped for. ![]() This board is used to control the driver board for the high-powered LED he purchased. He created a small circuit using a PIC that is used to interpret the initial pulse from the control board as well as watch for the steady “heartbeat” pulses that occur while the projector is powered on. At this point, the HV board powers down the bulb. Using his oscilloscope, he found that the control board pulses the high voltage board when the projector is powered on, and continues to pulse a signal until the machine is turned off. He figured that a high-powered LED would do the trick, so he ordered a handful of parts and went about his first retrofit. He was pretty confident that he could find a better way to drive the projectors, so he disassembled them once more and started looking around for bulb replacements. The only problem is that he didn’t want to mess with replacing the bulbs after every 2000 hours of use at $100 apiece. Recently repaired a handful of Phillips LCD projectors which he was quite excited to use. ![]()
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