| Electronics > Projects, Designs, and Technical Stuff |
| Re-using 7" tft lcd screen from old dvd player |
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| james_s:
Wow I just read the datasheet, you're right, it does have analog RGB inputs. How bizarre, I've never seen a LCD panel that is driven that way. Almost always they are digital RGB, higher resolution panels have a LVDS interface but many smaller or older ones are just TTL. |
| cdev:
I think the Pi's output is composite RGB. Maybe each color could be separated? Its a real shame that monitors, especially ones with touch input, that use the Pi's full display capabilities still tend to be pretty expensive. More than the Pi itself, thats for sure. |
| james_s:
The composite output is just that, composite baseband video. It can be separated into RGB snit that is a far from optimal approach. Those little backup camera monitors are about 20 bucks and accept composite video. The Pi has HDMI and there is also a DSI interface but it's quite hart to find panels that work with the older DSI interface it has. |
| nick_d:
Another way to do it might be using a mini ITX PC motherboard or smaller if such a thing exists... with something like a Celeron J3455 soldered to the board the price is about the same as an RPI but you must add DDR3 RAM. Get one with a VGA output and you will have the R, G, B analogue outputs and separated sync to drive this LCD. We use an STM32F767 with built in parallel LCD controller that uses about 30 pins to drive inexpensIve LCDs from Ebay. Better LCDs can be had from Digikey, but with cheap commodity models available on Ebay for around $15-20 as used in millions of elevators, fridges and such worldwide, I feel that going the surplus route is not warranted here. A bigger hassle is getting the connector from Digikey for the inevitable flat cable, and surface mount soldering it. Breakout kits from places like SparkFun may help here. cheers, Nick |
| amyk:
--- Quote from: In Vacuo Veritas on December 13, 2018, 03:59:52 pm ---Well, you could fool around until Halley's Comet shows up again... or just get a screen that works. --- End quote --- No one learns anything by just buying premade stuff. This is not a difficult exercise, if you want to get a timing controller just search "analog LCD controller" and you'll find plenty. Example: https://www.analog.com/en/products/audio-video/display-driver-electronics/analog-lcd-display-drivers.html But the datasheet has all the needed waveforms already. |
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