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Thread: So, give us new LCD touchscreen options!

  1. #191
    Constant Bitrate
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    Thats why the original CCFL will be kept. Pretty sure at night there would be no use for 2 CCFL lamps to be running.

  2. #192
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    Quote Originally Posted by sansoo24
    Ive combed through that site previously. I saw what you were talking about. In the long run the way that scouse and jcdillin are going will be better. I still beleive they need to find an AR film for the front of the panel though. If there design pans out than it will possibly be something that can be mass produced and sold on this site store for far less than 300 to 400.
    And if the one way mirror panel and contrast enhancing material (also being proposed for use with the CFL's) can be sourced by us rather than having to pay a company a huge markup, then it would also be far less than $300 to $400 the above company charges. My bet is this solution could be a lot cheaper than all the bits needed to build a high brightness CFL. And its much simpler and would probably handle rapidly changing brightness or partial sun far better.
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  3. #193
    MySQL Error Scouse Monkey's Avatar
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    Quote Originally Posted by sansoo24
    Thats why the original CCFL will be kept. Pretty sure at night there would be no use for 2 CCFL lamps to be running.
    I think we are ditching hte old CCFL now. The original ones are too bright at night anyway and would still need dimming.

    JCD has the sample ccfls on the way and we should have a suitable dimming inverter. That way we have full dimming control using only 1 inverter. The inverter can be controlled by a simple pot and/or photocell or a more sophisiticated custom PIC circuit with possible PC link to control it.

    Arathranar: $300-400!!! it it was going to cost anywhere near that much i wouldn't be bothering and I would just go and buy one of the transreflective screens I can get for 500! As for the partial daylight...i was thinkign about that and i do have a way to solve it. (JCD, maybe we should have 2 inverters - you should catch my drift from that)

  4. #194
    MySQL Error Scouse Monkey's Avatar
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    momanz, thanks for your input. Every idea is useful. however we are not building whole screens, we are just building an upgrade for existing ones. Or did you mean you could just go out and buy a lilliput or some cheap 250nit screen instead?

  5. #195
    MySQL Error jcdillin's Avatar
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    Quote Originally Posted by Arathranar
    This may have been mentioned somewhere in this monster thread but I don't remember seeing it.

    fpdisplays will retro fit an lcd to make it day light readable. Apparently all they do is add a one way mirror between the back light and lcd panel and add a contrast enhancing film to the front of the lcd. They change something in the region of $300-$400 for an 8" display if I remember correctly.

    This seems a lot simpler (and cheaper?) than sourcing and building a new high power backlight and it will automatically 'adjust' as the brightness changes - including handling partial sun on the screen.

    Does anyone know where you can get a one way mirror film or thin sheet?

    Well I should have a sample of AG film from 3M at home which i'm going to apply to my touchscreen to see if that helps.

    But the LCD's already contain a one way mirror type material. So I really dont see what they are adding that would make that much of a diffrence, I think it's just the AG film they are applying to front of the LCD

    If our solution was that expensive I would just send my LCD in to have them do it.

    I think our backlight control will give you even more power, so on those days your driving with the sun behind you, you can crank up the brightness or on a cloudy day you can turn it down, or just leave it on automatic and let it do the work
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  6. #196
    MySQL Error jcdillin's Avatar
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    Quote Originally Posted by momanz
    Hey guys, Just saw this thread and I wanted to chime in with my support. If you come up with a working setup that does not cost a fortune I may just buy one rather than sink $400 into a xenarc

    On the issue of controlling the backlight, have you considered using a SMBUS controlled MAX6640 chip or something similar? The chip is designed to sense temperature and automatically modulate the fan voltage (pulse width) to reduce or increase speed accordingly. There is also a version that adjusts voltage directly (not PWM). The beauty of this chip is that is uses a common transistor to measure temperature so... if we replace the transistor with a phototransistor (and prossibly a resistor or two) we will have (1) a way to detect ambient lighting, and (2) the ability to either automatically adjust the backlight or perhaps have a program monitor lighting and adjust the backlight through the SMBUS accordingly. I've already built a temperature sensor circuit and connected it the SMBUS header on my epiaM10 and it works beautifully.

    So that's the idea, the bad news is I'm worthless at programming and a complete novice at circuit design.

    Good luck with the project.

    -momanz

    Hey thanks, any info at this point is helpful
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  7. #197
    MySQL Error jcdillin's Avatar
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    Quote Originally Posted by Scouse Monkey
    I think we are ditching hte old CCFL now. The original ones are too bright at night anyway and would still need dimming.

    JCD has the sample ccfls on the way and we should have a suitable dimming inverter. That way we have full dimming control using only 1 inverter. The inverter can be controlled by a simple pot and/or photocell or a more sophisiticated custom PIC circuit with possible PC link to control it.

    Arathranar: $300-400!!! it it was going to cost anywhere near that much i wouldn't be bothering and I would just go and buy one of the transreflective screens I can get for 500! As for the partial daylight...i was thinkign about that and i do have a way to solve it. (JCD, maybe we should have 2 inverters - you should catch my drift from that)

    Yeah I know what your saying, but I dont think it will work that way.
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  8. #198
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    Quote Originally Posted by Scouse Monkey
    Arathranar: $300-400!!! it it was going to cost anywhere near that much i wouldn't be bothering and I would just go and buy one of the transreflective screens I can get for 500! As for the partial daylight...i was thinkign about that and i do have a way to solve it. (JCD, maybe we should have 2 inverters - you should catch my drift from that)
    Yes, but that price is for a commercial, warranted install. If we source the two sheets ourselves and do the installation ourselves it would be substantially cheaper. How much do you think a company would charge to retrofit a high brightness backlight along the lines you're proposing? I'm confident it would be significantly higher than $400.
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  9. #199
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    Somebody on Ebay flogging hi output led's he may be able to find you something cheaper Scouse?

    http://cgi.ebay.co.uk/ws/eBayISAPI.d...768159332&rd=1

    Quote Originally Posted by Scouse Monkey
    yeah but they need an inverter and what is their area provinding 38000cd/m2? got a link to them?

    did you say you had a quote for the heater element style CCFL from that other site?
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  10. #200
    MySQL Error jcdillin's Avatar
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    Quote Originally Posted by Arathranar
    Yes, but that price is for a commercial, warranted install. If we source the two sheets ourselves and do the installation ourselves it would be substantially cheaper. How much do you think a company would charge to retrofit a high brightness backlight along the lines you're proposing? I'm confident it would be significantly higher than $400.
    but with playing with diffrent diffusers and other options I just dont think the current backlight has the light output needed to bump up the brightness, even with new reflecters and polarizer sheets.

    Thats why we are going with the more ccfl tube approach, personally i'm not in this to make money, i'm trying to find us DIY'ers a way to get the brightness to a useable level.
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