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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
Hi all. Probably not feasible but bear with me.
Why hasn't someone made a variant of OLED using small glass or polymer spheres coated inside with spiralled silver conductive paint with insulation, suitable hole transmissive coating and a capacitor to join the two sections together, filled with liquid OLED material such as rubrene or DPA ? Each one would resonate at a given frequency which would "light up" the OLED wirelessly.
I can't see any reason why this wouldn't work, and could be cheaply made using 3D printing techniques. Using a standard OLED material would substantially reduce the complexity and thanks to the high resistance to damage it would be possible to make novel materials which are not limited by the need for a glass substrate.
Changing the OLED to a liquid form would also mean that if the section nearest the electrodes went bad then simple agitation would restore light emission. I expect that if this works the way I think it will then these spheres could be the next "wonder material" as far as lighting and television displays as a line of pixels could be driven more or less independently with a simple ITO based antenna for each line.
To increase efficiency even further a silicon chip could replace the capacitor with a pulsed driver so that all the "pixels" flash at the same time to make the peak brightness higher. Same encapsulation could be used and due to the interdigitated electrodes on the silicon surface the OLED would be hundreds of times brighter than even a conventional display while preserving the regenerative nature of the display when agitated.
The best frequency for this would be 13.56 MHz as this is pretty standard for induction heaters, wireless power and other uses.
As for multiple pixel colours, simply using a dual layer chip with different fluids on each side would work here. You'd lose some colour but even a red and blue version of this display would be useful with colour filters.
(was watching "BTTF 2" and this got me thinking..)
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
Not that bad, the number of turns looks like around 15-20 with a 1mm diameter sphere. You can get capacitors smaller than this, 0402 IIRC.
Another relevant idea, put an HV850 on the chip so that it can charge up an onboard capacitor then discharge it through the OLED for a bright but short flash when its address shows up.
Re. colours, its also possible to mix rubrene and DPA so that alternate current gives you white, +V red and -V blue. This avoids the need for two layers and simplifies the device even more..
I see a future in this idea, anyone want to try and build it?
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Wireless OLED for flexible lamps?
