LCD interface boards

Keith_Williams · January 14, 2009, 6:08pm

Everyone,

I have told Gerald that I would create a set of LCD interface boards to bridge between Rev. C and a select set of panels.

Right now, I am planning on interfacing to an 640x480 6.4" NEC display, and a AUO 7" WVGA display (same display used in the raw LCD documentation on the elinux wiki). If there are other widely used panels I would consider interfacing to those as well.

Please reply back if there are particular panels that you would like to see supported.

Thanks,

Keith

Doug_Emes · January 14, 2009, 7:55pm

I'd like something in the 3 to 5 inch size frame... I have a physical size
constraint issue that would prevent the usage of the bigger displays.

John_USP · January 14, 2009, 8:26pm

How about the PSP1000 LCD/touchscreen that is available on eBay for about
$20.

Regards,

Jasun_Wurster · January 14, 2009, 8:33pm

Would the AUO B089AW01 be able to be driven with this board? It is the 8.9" screens in the Acer Aspire One’s.

I have attached the specs .pdf

jasun

B089AW01_V0.pdf (499 KB)

Keith_Williams · January 14, 2009, 8:40pm

Do you have a spec or datasheet for this? I'll definitely take a look

Keith_Williams · January 14, 2009, 9:40pm

Jasun,

Interfacing to this display is not a matter of simply level-shifting the
LCD lines. This is a LVDS interface and the lines would need to be
serialized in the right bit pattern.

I doubt that I do this one unless someone wants to pay for the
engineering time and/or there is a large concrete demand.

Let me know if you're willing to explore implementing this display further.

-Keith

Jasun Wurster wrote:

Leandro_Gentili · January 14, 2009, 10:31pm

This LCD has not Touchscreen included. The small connector is for backlight
led. You can find a touch screen for this lcd in sparkfun for $23.95

Regards,

Leandro

Jasun_Wurster · January 14, 2009, 10:46pm

Hi Keith,

Thanks for the info. I must admit that I am now well versed in the different LCD formats.

Is there a format of LCD signals that your proposed board would work best on? I am planning a project that works best with a 8.9 or 10 inch LDC.

Thanks,

jasun

John_USP · January 14, 2009, 11:39pm

From: beagleboard@googlegroups.com
[mailto:beagleboard@googlegroups.com] On Behalf Of Keith Williams
Sent: Wednesday, January 14, 2009 12:41 PM
To: beagleboard@googlegroups.com
Subject: [beagleboard] Re: LCD interface boards

Do you have a spec or datasheet for this? I'll definitely take a look
at it.

I believe the Sharp part number LQ043T3DX02.

http://document.sharpsma.com/files/LQ043T3DX02_SP_122805.pdf

Keith

John (USP) wrote:
> How about the PSP1000 LCD/touchscreen that is available on eBay for

about

bmxr · January 15, 2009, 12:02am

I would highly suggest anyone of the LCD's from Spark Fun

http://www.sparkfun.com/commerce/categories.php?c=76

Terry

John_USP · January 15, 2009, 1:14am

From: beagleboard@googlegroups.com
[mailto:beagleboard@googlegroups.com] On Behalf Of Leandro Gentili
Sent: Wednesday, January 14, 2009 2:31 PM
To: beagleboard@googlegroups.com
Subject: [beagleboard] Re: LCD interface boards

This LCD has not Touchscreen included. The small connector is for

backlight

led. You can find a touch screen for this lcd in sparkfun for $23.95

Leandro, thanks for letting me know. I thought the little connector was the
touchscreen, but after looking at the specs, you are right; this is for the
backlight LED. So, the touchscreen part number is HT043A-NCOFD52 and the
specs are available here:

Leandro_Gentili · January 15, 2009, 2:06am

John,

Anyways, $20 is a bargain! for a brand new SHARP display.

Leandro

c.dicaprio · January 15, 2009, 9:56am

Hello Keith,
I'm using this board from Olimex [1]. The board use a "LCD 3.5"
320x240 24bit color TFT color with backlight and touchscreen "
There are some specs file on the site: [2][3]. (thanks to Olimex that
post this info)

The LCD looks very good and small to fit on top of the beagle board;
but I'm only use it, and I don't no if it's ease to find on digikey or
farnell, and how mutch it cost.

Best regards and thanks for your effort.

[1] http://www.olimex.com
[2] http://olimex.com/dev/pdf/ARM/LPC/GFT035EA320240Y(SPEC).pdf
[3] http://olimex.com/dev/pdf/ARM/LPC/HX8238A.pdf

Keith_Williams · January 15, 2009, 7:32pm

This link may be helpful to see how the PSP1000 LCD was interfaced to the
NGW100 board.

http://dma.elektroda.net/ngw100-psp-lcd/ngw100-psp-lcd.html

Also, here is a general discussion about problems that should be avoided
when using this LCD.

http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t=54956

Thanks, I grabbed the docs. First glance, this looks like a good fit.

-Keith

Andrew_Huskinson · January 17, 2009, 7:17pm

Hi,

I am interested in a REVC board to run and learn about Ubuntu and ARM
as I see it as a forthcoming popular netbook platform. I will want to
run and develop code using MySQL.

I am looking to build a standard silver box containing the Beagleboard
and a powered hub in the base and a LCD screen or panel in the lid
running at at least 1024x768 which is what I run my 17" monitor at.

Would you be supporting a LCD panel at this resolution?

Cheers. Andrew.

Gerald_Coley1 · January 17, 2009, 9:58pm

The REV C2 board will support all the same resolutions as the current and earlier boards. It has the added feature of a header that provides the raw LCD signals for use by expansion cards. These are the same signals that drive the TFP410 DVI-D framer device on all of the boards today.

Gerald

Andrew_Huskinson · January 18, 2009, 11:28am

Hi Gerald,

I have not found a definitive statement about the resolution and
refresh rate available out of the S-video port.
I want to take 1.3MP web camera input, do some processing on a set of
images, and output video on a near-realtime basis.

There is some doubt as to whether the actual DVI-D/LCD resolution is
1280x1024 or 1024x768 expressed on some posts.
It appears 720px24 is supported, I presume on the DVI-D/LCD panel and
not on the S-video port.

Cheers. Andrew.

Soren_Steen_CHriste2 · January 18, 2009, 12:13pm

Hi Andrew,

The "Display Sub System" in the OMAP is very flexible - See chapter 15 in
the TRM. Basically the main constrain is that the maximum pixel clock
frequency is 75MHz according to the TRM page 2056.

As long you are running below this limit you can basically decide you output
resolution yourself (up to a maximum size of 2048x2048 AFAIR). It's
therefore possible to run either 1280x1024 or 1024x768 - It's "only" a
matter of SW...

Best regards
Søren

Andrew_Huskinson · January 18, 2009, 12:42pm

Hi,

Thanks for the info.

What resolution would Ubuntu support on the board?

Cheers. Andrew.

Gerald_Coley1 · January 18, 2009, 2:17pm

The HW can do 2048x2048 resolution, but at lower refresh rates. The actual resolution is of course determined by the support eh SW running can provide. depending on the video CODEC that is used, this resolution can vary. It does to 720px24. It can also do 1024x768 and 1280x1024. The limitation arises in the video CODEC that is used to provide that resolution when trying to perform for example an MPEG4 decode. If you just havea GUI for example siting there, then depending on the refresh rate a specific monitor can support, you are OK. If you want full screen video decode, the resolution would need to come down or you would need to provide the video in a window.

Other issues arise concerning certain monitors and their supported refresh rates. I you cannot support a specific rate needed for that monitor, it may not work where that resolution may work on another monitor will more flexible refresh rates being supported. native LCD panels are much more deterministic because you can fix it at the exact timing it requires. Monitors can have limitation based on what their front ends can handle.

S-video I believe would be limiterd to the 480p standard and I don’t think you Can get higher than that.

Gerald