8.9" LCD Screen

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1

Hi,

Could someone point me to an inexpensive 8.9" LED-backlit LCD (or OLED) screen that I could integrate to the Rev. C2 Beagle Board (hopefully one that someone has integrated before) and possibly a document or other resource that explains how to integrate the LCD screen to the board? Also, what is the cheapest way to get wifi on the board set up? Using a USB dongle? If so, any pointers to where I can get a cheap one that works?

Cheers,
Andreas

2

Hello

I have ~ 5 Nec tft color displays around 9', along with their
datasheet, waiting in a box to be tested on a beagleboard.

If you have a UPS account or some other way to cover the shipping,
I'll be happy to give you one.

They are using the standard LCD interface (6 lines for each color,
HSYNC, VSYNC, CLK, DE...) so they should work just fine with the revC

What you'll need :
- a level converter between 1.8 and 3.3V (IIRC) for the signals, and
12V for the backlight.
- some coding :slight_smile:

To me the hardware part is the most complicated, even if it seems
straightforward.

It'd be great to have a daughterboard which could be plugged over the
RevC that would provide access to the UART2, MMC2, the 3rd USB port
and a breakout for the LCD pins using standard molex connectors along
with a switch to toggle between DVI/LCD.

Additionally, since many people enjoy the PSP LCD, maybe it could even
come with a FPC ready to be used with a PSP screen. That'd come very
handy to the embedded hackers.

I for one would immediately purchase one. The pitch of the LCD and the
multiplexed connector (UART2, MMC2) on the Beagleboard is just too
small.

3

What is the part number of the NEC displays that you have? Also,
forgive my ignorant questions but I'm very new to this board and LCD
screens in general.

Since you need 12V for the backlight, does that mean that I need a 12V
supply? Also, if I were to install Angstrom on the board and
interfaced the LCD panel to the board, wouldn't they work immediately?
What coding do I have to do? (Maybe I should read the hardware guide
more carefully :slight_smile:

Why would you need a switch to toggle between DVI and LCD? My
understanding was that the same signals that are available on the LCD
Header go through the DVI-D framer chip to the HDMI connector; so you
can have an LCD panel wired directly and one connected through the
HDMI connector working at the same time? Or do you not want two panels
being on simultaneously?

I'm wondering, how do I control the LCD backlight? Through a PWM
signal? Maybe if you can give me the part number/data sheet I can
figure that out.

Cheers,
Andreas

4

Hi,

I may be interested, and I have everything needed to drive one.

What is the weight of one of the lcd panels?

Thanks,
Sean

5

Hello

What is the part number of the NEC displays that you have? Also,

forgive my ignorant questions but I'm very new to this board and LCD
screens in general.

So I'd kindly suggest you do not try to hack them at the moment. As
you said, if you hook up the LCDs to the board they will not work
immediately. Some hardware is needed, mostly for voltage conversion,
and certainly some software adaptation will be needed too.

I'll be happy to send you a LCD panel as soon as they are working
reliably. At the moment, we're just experimenting.

The other day I was ready to blow a couple of screens with my poor
hardware skills just to try to see if I could get something -
anything.

Then I though it'd be better to offer the straw screens to people who
can get a result without taking as much risks of killing them in the
process :slight_smile:

Why would you need a switch to toggle between DVI and LCD?

Because IIRC the same lines were used for DVI and LCD. I don't know if
they bear the same signals- but even them, since both screens are
likely to have different resolutions, I don't think it wouldn't be a
good idea to try to hook them up at the same time and see what
happens. Yet I'm no hardware guy - can't say for sure.

I may be interested, and I have everything needed to drive one.

Then it's yours.

I have a whole collection of NL 6448AC33-xx nec screens for testing in
medial devices, with xx={29, 24, 18, 10} for different color depths,

If you need a light one, I can send you a Optrex DMF-50260NFU-FW-23
along with its FPC cable. It's much much lighter. But unlike the nec
I don't have any others. You'll be on your own.

What is the weight of one of the lcd panels?

Hard to say. The lightest one weights less than my thinkoutside mini
mouse - I'd guesstimate that to 200g. Honnestly with some good padding
I think it'll perfectly fit in an enveloppe.

PS: if you succeed, could I ask you a RevC LCD breakerboard to access
the LCD signals on big molex connectors :slight_smile:
I'd like to play too !

Guylhem

6

I'm aware of the voltage translation part. Besides setting the
resolution of the screen, what software adaptation needs to be done? I
have no clue :frowning:

7

Hi,

I'm trying to add a LCD screen with a touchscreen in the Beagleboard
RevC.

http://radiospares-fr.rs-online.com/web/search/searchBrowseAction.html?method=searchProducts&searchTerm=476-533

I'm new to this board and LCD screens.I don't know how we can use the
LCD Signals from the Beagle.
In fact, from the LCD-Touchscreen I have 3 connectors

Conn1 : 30 pins including Red,Blue and Green Display data
Conn2 : Power Source
Conn3 : 4 pins for the touchscreen

I'm wondering if it is possible to connect this kind of device to the
BeagleBoard RevC ?

Thanks,
Bastien

8

I'm wondering if it is possible to connect this kind of device to the
BeagleBoard RevC ?

need a board that converts the 1.8v from beagleboard lcdouts to your
LCD acceptable voltages.

KP