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Thread: "Transflective" LCD panel with res touch+controler for $101+$36 S+H

  1. #131
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    by the way, the "white bar" on the edge of the screen is not the frame of LCD. it is the touch screen layer. The actual frame of LCD is underneath which you cannot see

  2. #132
    Maximum Bitrate tft_lcd_org's Avatar
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    Quote Originally Posted by 8838.com View Post
    Looks like it may be intended to leave black area by the manufacture, because small panel needs some space in one of four sides to save the circuit.
    Never heard that one before. In fact, I have never had a small panel lit @ 800x480 with ANY black bars! And just what exactly does "save the circuit" mean?

    I can understand if you are referring to actual area vs. active area but driving an LCD at it's native resolution ALWAYS fills the screen to the fullest active area possible. I have a feeling this controller simply does not accept 800x480 input and it is scaling to fit the LCD, much like the Lilliput and other low cost controllers do.

  3. #133
    Wants to make it harder monkeyracer's Avatar
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    Also, notice how the right side of the screen is cut off? Notice the Date and Time in the task bar.
    One of the guys that has purchased it, that got 800x480 forced to the controller said it does exactly the same thing.


    No black bars:



    Black bars:


    I think it is what TFT_LCD_ORG said; the controller was not made for 15:9 ratio resolutions, and when forced into it, it stretches the image.
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  4. #134
    Mod - iPad Forums RipplingHurst's Avatar
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    Right when I thought finding the right screen is a challenge big enough...now I come to realize that it's just as hard to find the right controller. Manufactuters should build screens with the controllers in mind (actual and possible).

  5. #135
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    Finally found the datasheet for the main chip (well close anyway), unfortunately it looks like only 16:9 and 4:3 are supported

    http://pdf.chinaicmart.com/88888/2008619101310950.pdf

  6. #136
    Maximum Bitrate tft_lcd_org's Avatar
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    Quote Originally Posted by RipplingHurst View Post
    Right when I thought finding the right screen is a challenge big enough...now I come to realize that it's just as hard to find the right controller. Manufactuters should build screens with the controllers in mind (actual and possible).
    Yes, but I think controller manufacturers need to get with the program too. It's not like 800x480 (or even 1024x600) on small panels is something new.

    Problem is, there are a boat load of cheap $5.00 AD boards out there. And, it is much (MUCH) cheaper to reprogram them than it is to design a proper one or even retro fit an existing design.

  7. #137
    Wants to make it harder monkeyracer's Avatar
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    What gets me is that 16:9 or 15:9 resolutions have become pretty standard in monitors and tvs, yet, the controllers are stuck in 4:3 formats. I understand it's a lot cheaper to use existing designs, but I'd have figured that since the widescreen resolutions have been out for so long, the trickle down technology effect would have given us a widescreen controller to use.
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  8. #138
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    finally we got resolution for this issue :)

    I got my tech guy work overtime to dig out the problem during weekend. Here is the resolution:

    1. nVidia video card can add custom resolution. if you use ATI video card or other video card, which can not get 800*480 resolution, try "PowerStrip", you can download following link:
    http://entechtaiwan.com/util/ps.shtm

    2. for the black bar problem. It just the software default setting flaw which can be resolve by the setting in monitor menu as photos below (set the "vposition" to 37 instead of 50):





    Another thing we want to point out here is, this LCD only use 800*480 resolution which is not a harsh require to the driver board. Instead, it is quite simple to handle. If we demands higher than 1920*1200, that is tougher. For example, 2560*1200. That resolution need Dual-link DVI connector plus big VIDEO RAM to adapt. Not all driver board can do

    PS: We have not pay attention to this issue before, thanks for address it. If anyone found any more problem please let us know

  9. #139
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    Also, the driver board just past through signal. there is no proportion problem like 16:9 or 15:9. It is dot to dot. The only problem is the default position with the software in the drive board, which can be adjustable.

    For the right side cut off, I think the problem is from Win7 we used. When we set the resolution below "1024*768", it pop up a warning "if your resolution is below 1024*768, some items may not fit on the screen".

    Keep in touch and wish everybody a peaceful weekend

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    tft_lcd_org, any news on the other controllers? I'm very interested in buying one if it works correctly.

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