Using a mirror on a 45*degree angle a 7"RCA DRC618N lcd a light in an enclosure with out taking the lcd apart input a tv signal to the portable lcd is it possible to strenghten the projected image out a little bit brighter without taking anything apart i would like to now more about collimators and collectors can my projector some how use this in the direct reflection method.Here is the projector plan!!http://www.audiovisualizers.com/madlab/lcd_proj.htm
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You could try....
The 7"RCA DRC618N is a good tablet style DVD player that has a transmissive lcd with a backlight, so it won't work well in that design projector. If you could find a reflective LCD to use in it, it might work well because reflective LCDs are made to reflect light to produce an image.
If you are determined not to take anything apart on the 7"RCA DRC618N , look for a 7 inch or larger diameter CRT projection lens. Then take the anti-glare off of the lcd (or leave it on if you don't think it will be worth the chance, most leave it on), crank the brightness to maximum on the LCD and set it directly on the back of the CRT lens. CRT lenses are designed to be used that way (almost in contact with the image source), and will catch almost all of the light coming out of the LCD. The CRT lens will have a really short focal length, so you will have a large projection from just a few feet away from whatever you are using for a screen. It will probably be fairly dim, but it will be really sharp, so get the room really dark.
Also, keep in mind that everything will project backwards and upside down because of the nature of the way lenses work. Flipping the DVD player will fix the upside down part of it, but everything will still be backwards. To fix the backwards part you will have to reflect the light coming out of the lens with a mirror. Put one edge of the mirror almost touching the top of the lens, and angle the mirror by hand to aim it toward your screen until you get it the way you like. It'll probably be at about a 45 degree angle, give or take a little.
Remember to block light leaks around where the LCD meets the lens with some black foam weatherstripping or something similar.
Actually it might turn out pretty cool, if it works well, let us know. It could be the first DIY battery powered portable projector.
The 7"RCA DRC618N is a good tablet style DVD player that has a transmissive lcd with a backlight, so it won't work well in that design projector. If you could find a reflective LCD to use in it, it might work well because reflective LCDs are made to reflect light to produce an image.
If you are determined not to take anything apart on the 7"RCA DRC618N , look for a 7 inch or larger diameter CRT projection lens. Then take the anti-glare off of the lcd (or leave it on if you don't think it will be worth the chance, most leave it on), crank the brightness to maximum on the LCD and set it directly on the back of the CRT lens. CRT lenses are designed to be used that way (almost in contact with the image source), and will catch almost all of the light coming out of the LCD. The CRT lens will have a really short focal length, so you will have a large projection from just a few feet away from whatever you are using for a screen. It will probably be fairly dim, but it will be really sharp, so get the room really dark.
Also, keep in mind that everything will project backwards and upside down because of the nature of the way lenses work. Flipping the DVD player will fix the upside down part of it, but everything will still be backwards. To fix the backwards part you will have to reflect the light coming out of the lens with a mirror. Put one edge of the mirror almost touching the top of the lens, and angle the mirror by hand to aim it toward your screen until you get it the way you like. It'll probably be at about a 45 degree angle, give or take a little.
Remember to block light leaks around where the LCD meets the lens with some black foam weatherstripping or something similar.
Actually it might turn out pretty cool, if it works well, let us know. It could be the first DIY battery powered portable projector.
Like this fig ??
An externally hosted image should be here but it was not working when we last tested it.
reply !
thanks to bothe who have responded what about useing the same drc618n portable on an overhead if i enclose it on an overhead taken the back off and projecting the image out of the lcd via the overhead how will this work i have just bought a 3m.
thanks to bothe who have responded what about useing the same drc618n portable on an overhead if i enclose it on an overhead taken the back off and projecting the image out of the lcd via the overhead how will this work i have just bought a 3m.
Hi bjou,
this is a nice diagram, but can't understand some things coz it is in Japanese (or Chinese?)
Is it a mirror at the bottom, beneath the icd panel? If it is, what is it doing there when the lcd is not taken apart? And what is it, at the left side, opposite to the bulb, fixed on the back wall of the projector? Can you or anybody who knows the language explain?
Thanks
this is a nice diagram, but can't understand some things coz it is in Japanese (or Chinese?)
Is it a mirror at the bottom, beneath the icd panel? If it is, what is it doing there when the lcd is not taken apart? And what is it, at the left side, opposite to the bulb, fixed on the back wall of the projector? Can you or anybody who knows the language explain?
Thanks
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