Archive

Posts Tagged ‘n86’

Nokia N85/N86 AMOLED display hacking project AMDF001 / AMDN001

October 9, 2011 Leave a comment

Well, after a while , I’ve found that E51-like LCD displays are barely readable in sunlight, which renders them unusable in outdoor conditions. So, after deep search, I’ve found nice and cheap potential solution : N85/N86 display.
It is active matrix OLED screen (AMOLED) 320×240, 2.58″, manufactured by (I believe) Samsung SMD (www.samsungsmd.com). There is markup on this OLED : AMDF001 AMDN001 (see below …) (which is probably FPCB model type (flexible printed circuit)). Other ID’s are : 4850084 (which is probably manufacturer ID code (see google)), MP1.0 which denotes interface protocol? (MeSSI ?)

Display have FPC 24-pin connector widely used by Nokia (same as E51), but different pinout is used – see N85/N86 schematic wiring diagram -> google it, download level 1/2 manuals.

Nokia uses codename Falcon for this display -> no effect after google.

What I’ve done :
1. As microcontroller I used PIC32MX (340F512H), communicating with PC via UART
2. I’ve created 2 prototype boards :
a) level shifter board (3.3V -> 1.8V) using 74LVC4245A (2x) one for databus D0..7, one for controls (RDX,WRX,RESX,DCX)
b) OLED display power supply (MC1727-500 & MAX889) generating -4.9V & +4.6V for ELVSS & ELVDD respectively.
3. I’ve dismounted 24 pin connector from display’s FPCB and soldered 24 wires to that connector’s pads (I’ve used old 80-pin ATA cable as a small wire donor)

After battle with my solder gun I finally ended up with working prototype, with NULL knowledge of protocol…

Digging the Web for similar display’s datasheets I’ve found that similar displays controllers using similar interface protocols, of course AMDF001 is using Intel 80 8-bit bus, just like E51 module.
It seems that it is using such protocol :

1. with DCX=0 write register addr (D0..7 => reg index)
2. with DCX=1 write data to that register … 8-bit or 16-bit??? (double 8bit transfers?)

After brute-forcing this module I’ve found that it is responding to commands (screen blinks, fades in/out, eventually even GRAM memory contents showed up on screen, nice)

Now it is long road to descramble the protocol & register locations…

Or maybe someone has something to say in this topic ???
Any help appreciated!

Update #1 : After days of digging the net searching for possible driver IC that drives this amoled, I’ve found that:
1) probably I have problem with connection bus (amoled seems to respond randomly to sent commands)
2) amoled is responding only when (sic!) LVC4245 is driven reversed (pic<-amoled) on data bus… strange..
3) I personnaly think that IC might be LD9014 from LDT,inc.
4) I really don't think it is S6E63D6X, just because of 262K color depth instead of proclaimed 16.7M for this amoled

Update #2 : Shame on me! These modules I got aren’t AMOLEDs… They turn out to be cheap chinese fakes – LCDs, looking like AMOLED, but they’re not.
Waiting for new delivery, hoping for getting real AMOLED now for n85/86.
Bloody differences ? Here you’ve got :
1) Shorted pins 11 & 12 (EL_ON VIO), gives constant 1.8V on EL_ON…
2) There is small BGA packaged IC on the FPCB just below the screen ( on the back side) – it is probably dc-dc charge pump for LED backlight (very smartly hid below the screen), original AMOLED has only some discrete smd parts on FPCB…
3) real AMOLED has MP2.1 protocol designation & AMS258DN01 module type (driver IC still unknown)

Update #3 : Module marked AMDF001A is an ordinary TFT module compatible with MP1.0 protocol, just like E51 module. Only pinout & backlight driving are different.
Still waiting for AMDN001 modules (which should be amoleds)

Advertisements
Categories: LCD, PIC32, Project Tags: , , , ,