DLP conntrol lines 1

[AlanJ647]

I'm modifying a DLP projector to increase the frame rate. I know where the data lines are on the DLP chip. but the control lines are tricky. Any one know how to use the control lines?

 

[analogkid2digitalman]

Does the manufacture of the chip offer data sheets?

Wheels within wheels / In a spiral array
A pattern so grand / And complex
Time after time / We lose sight of the way
Our causes can't see / Their effects.

 

[felixc]

I worked with DLPs some five years ago. They were just introduced. A DLP chip is curiously similar to a TFT panel, in terms of timings.

There is only one manufacturer of DLP. It is Texas Instruments. Get the spec sheets to make yourself familiar with.

The DLP is normally synced to the source. Although some are placing frame buffers and filters in between to rescale the input signal to the timings of the DLP. Whoich type of projector are you using?

If you want to increase the frame rate, it means that the frame rate of the source is also increasing, right?

What circuit generates the pixel and sync clocks? Do you have to design your own or are you trying to adapt the one already in place? At which frequency do you want to operate it?

 

[AlanJ647]

There are no datasheets on DLP chips available anywhere. If you do find some, this would be a huge achievment. So working with the chip is pretty much guess work.

Rather than try to use the controller chips on the DLP controller board to operate the DLP chip, I'm interfacing directly to the DLP chip itself. This eliminates concerns about sync and timing.

Data is written to the DLP one 64 bit word at a time. There are 16 words or 1024 bits in a row. There are 768 rows in a frame. There are about a dozen control lines that take care of the addressing and latching of the data. There are a couple of pins that operate with 12-24 volts.

I'm using an Infocus Litepro 620 but the operation of the DLP chip are pretty much the same for most projectors.

 

[melone]

Are you sure that you can simply increase the frame rate? Is the H/W capable of handling the increased speed (decrease in amount of processing time)? Even it can handle it for a brief time, it will probably increase the stress on the components / decrease the life span. How much is anyones guess.

 

[felixc]

To get the datasheets, you will need to talk to TI. It would be nice if you had the part number of the one used in your projector. (something like DDP1000). If you want to make more than one unit, they may listen to you.

Getting the datasheet will tell if increasing the framerate is feasible with the part that you want to use.

 

[AlanJ647]

TI does not relase datasheets to anyone who hasn't bought the $10,000 DLP starter kit.

I'm writing data directly to the chip, bypassing the controllers. Overheating is not an issue.

I don't know the part number of the DLP chip because it's buried underneath a lot of wires from my test jig. It was so difficult to attach the test jig to the chip that I don't want to move anything to see the part number.

If anyone knows how any DLP works, that info would be enough for me to figure out how my DLP works. Or, If necessary, I would buy that model projector, attach a test jig to it and figure out that DLP chip, based on your info.

 

[IRstuff]

per

http://www.dlp.com/Default.asp?bhcp=1,

it's an array of tiltable mirrors

TTFN

 

[AlanJ647]

I am intimately familiar with the general workings of the DLP. What I meant was, if anyone knows the pinout of any DLP, this would be extremely valuable. Specifically, the function of about a dozen pins which control the writing of data to the chip

 

[Madcow]

http://www.ti.com/sc/docs/products/dlp/2503686.pdf

only one I could find.

 

[AlanJ647]

Thanks Madcow, I printed the info. Now the holy grail is the actual pinout of any DLP chip.