RE: [Gumstix-users] Sharp LQ050Q5DR01 LCD

[David V. <dve...@ta...>]

PCLK is the pixel clock and should be connected to the LCD CLK pin. 
Looks like you have most everything else correct.
You can run the display from 3.3v. You may also need a backlight control.
I used a pwm from the PXA255 to control my backlight. You may also need a
bias generator.
You probably have to outboard this if it is required. Maxim and others makes
a bias chip. 
I wish Gumstix had put this chip or a place for it on the Audiostix2 board.

DV 

-----Original Message-----
From: gum...@li...
[mailto:gum...@li...] On Behalf Of Sumit Birla
Sent: Sunday, May 28, 2006 5:59 PM
To: gum...@li...
Subject: Re: [Gumstix-users] Sharp LQ050Q5DR01 LCD

Good to know.  I have been doing some reading and this is my understanding
of the interface so far (view with fixed width font; I'll put this on a
website eventually) -


GPSstix        Sharp LQ050Q5DR01      My understanding
----------------------------------------------------------------------------
--------
LCLK            PIN_3  Hsync          signals the end of line
BIAS            PIN_13 CLK?????       signals that new pixel data is 
ready to be read
PCLK            ?????????             pixel clock
FCLK            PIN_28  Vsync         signals the end of a frame
LDD15           PIN_29  R5            RED_4 - Most significant bit     
LDD14           PIN_27  R4            RED_3
LDD13           PIN_25  R3            RED_2
LDD12           PIN_21  R2            RED_1
LDD11           PIN_19  R1            RED_0
LDD10           PIN_8   G5            GREEN_5 - Most significant bit 
LDD9            PIN_6   G4            GREEN_4
LDD8            PIN_4   G3            GREEN_3
LDD7            PIN_37  G2            GREEN_2
LDD6            PIN_35  G1            GREEN_1
LDD5            PIN_33  G0            GREEN_0
LDD4            PIN_24  B5            BLUE_4 - Most significant bit 
LDD3            PIN_22  B4            BLUE_3
LDD2            PIN_20  B3            BLUE_2
LDD1            PIN_16  B2            BLUE_1
LDD0            PIN_14  B1            BLUE_0


Since this LCD is an 18-bit display, I'll simply ground the least
significant bits for blue and red (RGB565, I assume).  I don't see a pin for
the BIAS in the datasheet, however.  Where does this go?  PIN_13 is
described as 'Clock signal for sampling each data signal'.  If this is the
BIAS, then to what does PCLK connect?

Also, can I use the GPSstix to power the LCD (3.3V)?  I have a picture of
the lines available on this board at http://sumitbirla.com/temp/gpstix.jpg


- Sumit



David Vescovi wrote:
> I used a Sharp LCD very similar to the one you have in my GPS application.
> Should be possible.
>
> http://home.tampabay.rr.com/vescovi/gumstix/gumstix.htm
>
> DV
>
>
>
>
> -----Original Message-----
> From: gum...@li...
> [mailto:gum...@li...] On Behalf Of Sumit 
> Birla
> Sent: Saturday, May 27, 2006 9:06 PM
> To: gum...@li...
> Subject: [Gumstix-users] Sharp LQ050Q5DR01 LCD
>
> Hello all,
>
> Has anyone interfaced this Sharp 5inch 320x240 LCD successfully with 
> Gumstix?  Just trying to gauge how much work will be involved.  I have 
> put the datasheet for this LCD at http://sumitbirla.com/temp/ for your 
> reference.  It would be helpful if someone could take a look to catch 
> any potential show-stoppers.  My knowledge of electronics is limited.
>
> The goal is to build an indash GPS/OBDII/MP3 device (I am probably not 
> the only one on this quest).  Previous attempts resulted in a 'not so
efficient'
> design.  I am glad that I discovered Gumstix; ordered it last week and 
> got the basic stuff working... console, USBNet, GPS, mp3 player, toolchain
etc.
>
>
>