Re: [beagleboard] Driving an LVDS display. What are the LCD_Data lines?

[Gerald Coley]

Colors? Well, it depends on the mode, but for what we use, you can look at the schematic. They are listed there. You can also find them on the BeagleBone schematic as well. And you can look in the Technical reference Manual for the processor. A cape that supports LVDS already exists.http://circuitco.com/support/index.php?title=BeagleBone_LVDS_LCD_Cape

Hardware? You may need to level shift them. I have no idea what LVDS device you plan to use, but that may be required.

Sample schematic? You might look at the LVDS cape I mentioned earlier. http://circuitco.com/support/index.php?title=BeagleBone_LVDS_LCD_Cape

Gerald

On Tue, Jun 4, 2013 at 9:29 AM, <witc...@gmail.com> wrote:

Hello,

I would like to drive an LVDS flat panel display from my BeagleBone Black. I see 24 bits of LCD data (and sync info) provided on one of the headers. My questions are:

1. To what color information do the LCD_DATA lines correspond? (e.g. LCD_DATA0 = R0, etc.)
2. Is there anything special I need to do in hardware/software to get 24 bits of color output?
3. Can anyone provide a sample schematic for going from 24 bits of LCD_DATA to an LVDS driver?

Thank you for any support.

Best regards,
Paul

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Gerald

 

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[Gerald Coley]

Yes, it can do 24 bits of data. That is found in the Technical Reference Manual.

Gerald

On Tue, Jun 4, 2013 at 1:42 PM, <witc...@gmail.com> wrote:

Thank you for the quick response.

I see now where the colors are shown in the HDMI interface section of the schematic. However, this only shows 16 bits. Can the Beaglebone Black give me 24 bits of color data? And if so, which pins correspond to which color bit?

The cape design is helpful, but again, not all 24 bits are shown.

Where can I find this additional information?

Best regards,
Paul

[Brent]

Yep, this is the reference design I used in our application.  Keep in mind that this is for an 18-bit display, so if you need all 24 bits you will have to use some additional pins.  However, I found that if you use antialiasing and save your images as 18-bit images, you do not need the extra color depth.

 

The schematic is located at the vendor's website here: https://docs.google.com/file/d/0B7BWcJPjt1LNV1ZUVTJtbVZNb2M/edit?pli=1

On Tuesday, June 4, 2013 11:12:53 AM UTC-4, Gerald wrote: