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Last Post 11 Oct 2004 01:05 PM by  fbergmaier
LCD Driver Pixel Format
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fbergmaier
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31 Aug 2004 08:55 AM
    I am using a Sharp LQ035Q7DH01 panel with the logic LCD driver. I know from the lpd_LH7A400_LCDC_rel_100.reg file that the EGPEFormat is set to gpe16Bpp, but I don't know the exact format of the 16 bpp. For example, is it 565 (5 bits Red, 6 Bits Green, 5 bits Blue)?

    Frank
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    03 Sep 2004 10:32 AM
    fbergmaier,

    For starters I would point you to the LH7A400 User's Guide http://www.sharpsma.com/sma/products/mcu_soc/users_guide.htm , check out chapter 10, it covers LCD and this will be your best bet.

    Regards,
    fbergmaier
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    11 Oct 2004 01:05 PM
    Aaron, I have checked the Sharp user guide. The LCD controller spec's "555 with an Intensity Bit" or standard 565.

    My application runs under WinCE 4.2 and implements video with a double buffer scheme. Right now I use an offscreen Windows DIB section that is set up for 16 bpp/555. The DIB is BitBlt to screen memory on frame update. When I change the DIB to 16 bpp/565 my frame rate is cut in half. I am assuming that my on screen bitmap must be 16/555 and that the frame rate reduction is due to a bitmap compatibility issue.

    The trouble is that it does not appear to be a way to force Windows to use 565 even though it looks like the hardware would support this pixel format. The logic LCD driver (Mode 6 LCD Panel) only spec's gpe16Bpp and does not get into 555 or 565 details.

    Is it possible that the Logic video driver only understands 555 and not 565?

    Thanks for the help,
    Frank
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