Jump to content

Photo

psychicall lynx lcd dimension


92 replies to this topic

#26 GadgetUK ONLINE  

GadgetUK

    Stargunner

  • 1,946 posts
  • Location:UK

Posted Sat Sep 8, 2012 3:48 AM

Yeah, me too! I can imagine how crisp the image could be on a new LCD from when ive been playing Lynx ganes on my GP2X =)

#27 DarkLord OFFLINE  

DarkLord

    River Patroller

  • 3,314 posts
  • Location:Prestonsburg, KY USA

Posted Sat Sep 8, 2012 6:01 AM

Know its early, but put me on the pre-order list. :)

#28 karri OFFLINE  

karri

    River Patroller

  • 2,592 posts
  • Location:Espoo, Finland

Posted Sat Sep 8, 2012 11:23 AM

Having a LED backlight would reduce power a lot. Perhaps changing the caps and replacing the power supply by a modern chip would be good too...

#29 jmetal88 OFFLINE  

jmetal88

    Dragonstomper

  • 723 posts
  • Location:Derby, KS

Posted Mon Sep 10, 2012 6:40 AM

I'd definitely be interested in a new Lynx LCD. Not only would improved clarity be extremely desirable, but that would also give me a foolproof way to get rid of my dead pixel!

#30 candle OFFLINE  

candle

    River Patroller

  • Topic Starter
  • 2,793 posts
  • Location:Lublin, Poland

Posted Mon Sep 10, 2012 8:30 AM

i've received lynx ii in the mail today - after trying to play batman returns for few minutes i'm speechless
how one could ever advertise it as COLOR LCD?
COLORIS at its best, and completly unreadable
vertical ghosting after light to dark transitions in upper part of the picture are normal?

good thing: its enormously hughe, so modern lcd module, including all glue logic and tv out can be easly fitted to place where original screen was, picture will be slighty smaller though (5mm smaller, so 75x48 will be 70x43)

#31 108 Stars OFFLINE  

108 Stars

    River Patroller

  • 2,277 posts
  • Location:Frankfurt, Germany

Posted Mon Sep 10, 2012 9:21 AM

Well, it is horrible by today's standards, but it still beat the GameBoy and GameGear. You must never forget it was one of the very first color LCDs ever.^^

That said, I can play with it; and read text too. But it is true that the brightness adjustment basically only leaves a small area of visibility, when you turn the wheel much in either direction you can forget it. And it all seems very bright, maybe the backlight is too strong and washes out the colors or something.

A better LCD would be very welcome; eventhough I can play with the old one, I fear that the screens will go bad of old age eventually, and there must be a way of replacement so Lynxes are not rendered useless soon. :)

#32 candle OFFLINE  

candle

    River Patroller

  • Topic Starter
  • 2,793 posts
  • Location:Lublin, Poland

Posted Mon Sep 10, 2012 9:41 AM

i never had a lynx before, so this is where i stand, don't get me wrong here - i'm just a kido with new toy which is very old in fact and i'm expecting to see what i know as "color lcd" - and this is at worst nokia 3510i screen

anyways, i'm working on it, maybe tomorrow i'll have some display on RGB output

#33 108 Stars OFFLINE  

108 Stars

    River Patroller

  • 2,277 posts
  • Location:Frankfurt, Germany

Posted Mon Sep 10, 2012 10:34 AM

I absolutely understand, I played Lynx the first time three years ago, and it is quite a hit in the face when you are used to modern stuff.^^
Just saying you can get used to it if you always tell yourself it was one of the very first ever.^^

Edited by 108 Stars, Mon Sep 10, 2012 10:35 AM.


#34 MrBland OFFLINE  

MrBland

    Dragonstomper

  • 826 posts
  • 474|2!
  • Location:Richmond, Va

Posted Mon Sep 10, 2012 10:50 AM

I don't know if there is anything to this or if my eyes play tricks on me, but I seem to have a better picture on my Lynx I than I have on the II. I have read that the Lynx II was supposed to have a "sharper" screen. Maybe making it "sharper" made it darker and less vibrant too.

#35 karri OFFLINE  

karri

    River Patroller

  • 2,592 posts
  • Location:Espoo, Finland

Posted Mon Sep 10, 2012 11:43 AM

Nokia 3510i was made 10 years ago. The Lynx more than 20 years ago.

C'mon guys. The Lynx LCD works better than the PSP screen outside in bright sunlight. That is if you cut away the plastic lens.

Inside its another story. The Lynx has no black at all. Only hues of grey.

I am very excited to see if you really get some glue logic to work between the old Lynx chips and a modern LCD screen. I wish you good luck.

--
Karri

#36 candle OFFLINE  

candle

    River Patroller

  • Topic Starter
  • 2,793 posts
  • Location:Lublin, Poland

Posted Mon Sep 10, 2012 12:02 PM

seems like screen is organised as 3 individual screens rather than single one (it doesn't split on RGB pixels, even not on R, G, B planes, istead per 160 RAW pixels, don't mind the color), each clock line is active only for 1/3 of horizontal raster time
as a proof i've removed one clock pair (CLK1) and that disabled first 1/3 of the screen area

#37 TailChao OFFLINE  

TailChao

    Dragonstomper

  • 522 posts
  • Bup?

Posted Mon Sep 10, 2012 12:25 PM

I have been doing research on this same thing, I'm glad someone else is doing it as well :)

seems like screen is organised as 3 individual screens rather than single one (it doesn't split on RGB pixels, even not on R, G, B planes, istead per 160 RAW pixels, don't mind the color), each clock line is active only for 1/3 of horizontal raster time
as a proof i've removed one clock pair (CLK1) and that disabled first 1/3 of the screen area

Yes, this is actually why some units end up with different brightness levels among the three 160-pixel segments in the screen when the ribbon goes bad. The design is so bizarre.

Since the LCD can have variable refresh rates, it's best to just triple buffer the entire 160x102x12bpp in some external RAMs and then switch between them when one frame has finished drawing. So then there's no need to worry about color changes on a scanline and 50/60/70Hz refreshes. Everything can just be dumped out at 60Hz.

C'mon guys. The Lynx LCD works better than the PSP screen outside in bright sunlight. That is if you cut away the plastic lens.

Inside its another story. The Lynx has no black at all. Only hues of grey.

They blur about the same as well :P
The low contrast makes color choices for good visibility quite stressful too.

#38 candle OFFLINE  

candle

    River Patroller

  • Topic Starter
  • 2,793 posts
  • Location:Lublin, Poland

Posted Mon Sep 10, 2012 12:43 PM

triple buffering will add a lag, which might be not desirable, and impact game playability
but this might be subjective, or even only in my head

getting all-for-all 60hz rgb output would be nice, but additional logic that would make it tick will be quite enormous
i'm going to keep it simple, at least in initial version

could someone provide background data on games and their frame rate? if there are only games that run >=60hz then we can have simple VGA out without going into much details like triple buffering

#39 karri OFFLINE  

karri

    River Patroller

  • 2,592 posts
  • Location:Espoo, Finland

Posted Mon Sep 10, 2012 1:03 PM

The Lynx can only have three refresh rates 50Hz, 60Hz or 75Hz.

All "modern" games will run at 75Hz as there is really no point in using the lower rates. Most of the time the Lynx shows identical content for many frames. The real fps is usually 75Hz divided by 1, 2, 3, 4, 5, 6, ... depending on how much data the Lynx has to draw. I have not seen many games with higher refresh rates than 8 fps or so.

Edited by karri, Mon Sep 10, 2012 1:06 PM.


#40 candle OFFLINE  

candle

    River Patroller

  • Topic Starter
  • 2,793 posts
  • Location:Lublin, Poland

Posted Mon Sep 10, 2012 1:39 PM

if that would be A8 game running at 8FPS then it would be mostly unplayable at all
25fps is ok, 12.5fps is berable, but lower than this - no

anyways, p1-p3 are important only for this particular LCD screen as they are responsible for shades, but don't carry any color information in them
basically it looks like 4 bit counter running at 128khz

#41 remowilliams OFFLINE  

remowilliams

    Quadrunner

  • 10,607 posts
  • Location:Detonation Boulevard

Posted Mon Sep 10, 2012 1:46 PM

A new LCD for the Lynx would be awesome... I modded my Nomad with one, and the difference is stunning. :cool:

#42 candle OFFLINE  

candle

    River Patroller

  • Topic Starter
  • 2,793 posts
  • Location:Lublin, Poland

Posted Mon Sep 10, 2012 2:10 PM

CL2 is for line counter, RESET makes VSYNC, this is about all that is required to get lcd/tv out working

#43 LX.NET OFFLINE  

LX.NET

    Dragonstomper

  • 765 posts
  • Location:The Netherlands

Posted Mon Sep 10, 2012 2:41 PM

Quick comment to let you guys know this is awesome stuff. Please continue!

#44 GadgetUK ONLINE  

GadgetUK

    Stargunner

  • 1,946 posts
  • Location:UK

Posted Mon Sep 10, 2012 4:39 PM

I am blown away by how much understanding you have already. You are clearly an expert in electronics! If you want a Lynx 2 at any point, just give me a shout and I will donate one of mine.

#45 candle OFFLINE  

candle

    River Patroller

  • Topic Starter
  • 2,793 posts
  • Location:Lublin, Poland

Posted Mon Sep 10, 2012 7:15 PM

i could use programable cart - any programable cart, even simplest one

so far i have FPGA pixel clock recovered, and vertical resolution displayed correctly, but horizontal one is giving me a headache
and i really should be sleeping :(

#46 jmetal88 OFFLINE  

jmetal88

    Dragonstomper

  • 723 posts
  • Location:Derby, KS

Posted Mon Sep 10, 2012 7:32 PM

You're doing an awesome job man! That's much faster than I would have been able to pick it up, if I wanted to try. Get as much sleep as you need, dude!

#47 candle OFFLINE  

candle

    River Patroller

  • Topic Starter
  • 2,793 posts
  • Location:Lublin, Poland

Posted Mon Sep 10, 2012 11:26 PM

i think i figured that out - it actually uses both clock edges, that would explain readouts of 79, 81, and 81 transitions on CLK1, 2 and 3
if you add other edge to it, it will be 79+81, 81+79 and 81+79 making total of 480 dots (160*3)

#48 108 Stars OFFLINE  

108 Stars

    River Patroller

  • 2,277 posts
  • Location:Frankfurt, Germany

Posted Tue Sep 11, 2012 4:54 AM

Your progress is impressive, with all up to this point I have read from people being that it would be almost impossible to do a Lynx replacement screen without all the official schematics etc.

#49 Shawn Jefferson OFFLINE  

Shawn Jefferson

    Stargunner

  • 1,987 posts
  • Location:Victoria, Canada

Posted Tue Sep 11, 2012 12:40 PM

haha, I don't think Candle knows the meaning of the word.

#50 candle OFFLINE  

candle

    River Patroller

  • Topic Starter
  • 2,793 posts
  • Location:Lublin, Poland

Posted Wed Sep 12, 2012 4:06 PM

in another galaxy, far far away...

Posted Image

and general setup (MESS)...

Posted Image




0 user(s) are browsing this forum

0 members, 0 guests, 0 anonymous users