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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
Hi all.
Seems that there may be another trick I can do to enable 3-D on those glasses. I obtained a surplus TEA2000, and after winding the 2000+ turn luminance delay (ugh) and soldering it dead-bug style onto a solid ground plane it works fairly well.
Also did some transmission tests with the R/G/B LED's I purchased on Ebay to ensure that the green only passed green etc. The plan is to replace the white backlight on the glasses with the LED's having modified them into a thin block format (to reduce distortions) and drive them in pairs so that they can be switched on in the order G (left) RB (right) or RB (left) to green (right) to enable the 3-D effect.
This has the advantage that it elliminates flicker and reduces crosstalk between the displays to near zero.
I have also determined that using the odd/even frame output from the LM1881 will allow me to get 6 levels of colour instead of 3, as the brain will "fill in the gaps" so to speak.
As for A-D, this does make things a little more complicated. I will need to have three independent sets of comparators (i.e. four chips) with each set up to increase the threshold level on receipt of an even frame input.
I may also be able to generate colour pictures using a PIC 12F675 triplet set up with common 27MHz clock so that you can overlay a number of input signals in different colours.
Pics soon -A
"Bother" said Pooh, as he ran out of wire mid-secondary...
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
Ran into a problem- due to an apparent wiring fault or earlier overvoltage the TEA2000 has stopped generating video. I fixed it with 1K resistor between vout and +V as it appears the internal video buffer has become damaged.
I also determined that the TTL inputs need a 1.5K resistor between them and ground to get meaningful video- hooked up simple resistive divider to get a "false colour" image.
Adding video buffer or other A-D (guess what, resistors don't have a bandwidth!) should be enough for what I need :)
Next idea is to generate the colour burst (10 cycles of 4.43MHz) and colour subcarriers using a PIC 12F675 running at 17.734451 MHz which would enable me to experiment further. (or just cheat and use a MC1377 which turned up today)
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
As promised, here are some pics of the myvu's guts.
Looks like the backlights are driven in series from a +7-8V supply (2*3.9V) so i can probably mount a PIC in place of one of the LED's and use the existing wiring to get the phase switching. I did read somewhere that PIC micros can have the outputs connected together through resistors to get higher drive current...
I have two headphone leads to work with, so superimposing a >15 KHz signal onto the right hand one nearest the micro by adding a series capacitor should be enough to control the backlights. Also there will be no brightness control unless I can switch the LED's somehow (possibly with a resistor to drop them below 2V)
Might not even need that, just a simple initialisation pulse on the headphone line and accurate timing on the PIC could work.
EDIT:- you need to use SiC based LED's not InGaN or GaN or the colours will bleed through and cause blurring.
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MC1377/TEA2000 + TV glasses 3-D mod
