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kender
Joined: 19 Jun 2005
Posts: 1231
Helped: 88
Location: Stanford, SF Bay Peninsula, California, Earth, Solar System, Milky Way
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 16 Aug 2009 11:00 pda size |
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Colleagues,
There's a host of nice LCDs out there, but I'm floundering trying to pick the one to work with. All I want to do is to be able to display colored text. My system will be based on LPC2129 or similar.
This one came close, but it's a bit small. http://www.crystalfontz.com/product/CFAF320240F-T. What's nice about it is that it can be connected to uC through SPI. If it were 240x320 (portrait orientation) and if it were 4 inches wide (about 100mm), it would be perfect.
I would appreciate and suggestions or insights!
- Nick
P.S. I don't forget to click "helped me" for those who helped.
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16 Aug 2009 11:00 Ads |
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XNOX_Rambo
Joined: 13 Jul 2002
Posts: 437
Helped: 87
Location: Far out, man!
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16 Aug 2009 11:20 cfaf320240f-t |
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Maybe this one:
http://www.sparkfun.com/commerce/product_info.php?products_id=8335
/Ram
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kender
Joined: 19 Jun 2005
Posts: 1231
Helped: 88
Location: Stanford, SF Bay Peninsula, California, Earth, Solar System, Milky Way
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16 Aug 2009 19:44 16 colour lcd |
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| XNOX_Rambo wrote: |
Maybe this one:
http://www.sparkfun.com/commerce/product_info.php?products_id=8335 |
I saw that one. It's a very nice display, but it can be fairly complex to interface.
It has 24bit color. For me 6bit or 8bit color would be sufficient. At this rate, even monochrome would work.
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XNOX_Rambo
Joined: 13 Jul 2002
Posts: 437
Helped: 87
Location: Far out, man!
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16 Aug 2009 22:59 pda size 4 inches |
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Here are some other types, from Optrex: http://www.optrex.com/products/groupdetail.asp?g=cstn
The "problem" with these (and many other displays) is that they are made for landscape orientation and either 6 or 12 o'clock viewing direction.
If you turn one of these 90 degrees to portrait orientation it might be illegible.
So what you really need is a display made specifically for portrait display - and the existing ones are small to suit PDAs and cell phones.
I've seen displays of the type you are looking for - but that was in Star Trek: The Next Generation... 
/Ram
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kender
Joined: 19 Jun 2005
Posts: 1231
Helped: 88
Location: Stanford, SF Bay Peninsula, California, Earth, Solar System, Milky Way
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17 Aug 2009 1:36 troubleshooting pda lcd display problems |
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| XNOX_Rambo wrote: |
| I've seen displays of the type you are looking for - but that was in Star Trek: The Next Generation... |
Actually, I saw a perfect display 2 days ago. It wasn't a movie. It was a peristaltic pump in a hospital. Take a look at the photo.
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hock
Joined: 28 May 2001
Posts: 1291
Helped: 23
Location: India
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17 Aug 2009 6:33 color lcd sizes |
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the big issue is not finding the big size display. go to any mobile repair shop and he can give you a big LCD display. the main issue is to find the pin schematics and controller details.
look at LG KP500, it has big 4" display with touchscreen but i could not find any controller details.
hock
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kender
Joined: 19 Jun 2005
Posts: 1231
Helped: 88
Location: Stanford, SF Bay Peninsula, California, Earth, Solar System, Milky Way
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17 Aug 2009 9:02 color 24-bit lcd odd size |
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hock, if somebody asked you to build a 1st prototype of a uC-based device with a color LCD in a few weeks, which LCD would you choose?
| hock wrote: |
| the main issue is to find the pin schematics and controller details. |
This is a barrier with several main issues. They are like layers of the onion.
1. Suppose the pinout is known. It will probably has dozens of pins, because nowadays most modules would have 24-bit color.
2. Suppose the uC has enough pins. I have a feeling that the developer has to write a thousand lines of code just before first demonstrable results (e.g. a few lines of colored text) appear on the LCD.
Last edited by kender on 17 Aug 2009 9:04; edited 1 time in total |
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XNOX_Rambo
Joined: 13 Jul 2002
Posts: 437
Helped: 87
Location: Far out, man!
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17 Aug 2009 9:03 pda size lcd |
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| hock wrote: |
look at LG KP500, it has big 4" display with touchscreen but i could not find any controller details.
hock |
Hock, if you would have read kender's/Nick's initial post properly you would have seen that he needs a display that is
about 4 inches wide in portrait orientation, not 4 inches diagonally.
The requested diagonal size would therefore be 6.7" (assuming a 4:3 display).
Do you have such humongous cell phones in India?! 
Back on topic, I have searched but the readily available displays I found in that size all have complex (non-serial) interfaces.
I guess the medical (expensive!) portrait example you found is custom made.
/Ram
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hock
Joined: 28 May 2001
Posts: 1291
Helped: 23
Location: India
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18 Aug 2009 7:17 color 24-bit lcd touch screen |
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i will be happy if i get even a 4" diagonal display with chip details.
can some one share the details of the biggest size mobile display they have used. i am more interested in mobile display as they are cheap and long term availability is assured.
hock
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kender
Joined: 19 Jun 2005
Posts: 1231
Helped: 88
Location: Stanford, SF Bay Peninsula, California, Earth, Solar System, Milky Way
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helios31
Joined: 17 Jul 2009
Posts: 15
Helped: 2
Location: France
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18 Aug 2009 23:05 datasheet lcd grafik optrex japan |
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| You can watch the display used by Microchip on the demo board AC164127- Graphics PICtail Plus Daughter Board, with touch-screen. I have one, very nice, but probably a little small for your project. Driver and display are sold separetly on Microchip website (only in small quantity of course), at a good price, I've already seen it, but I can't find it this time.
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