Testing a new 3.5” 640x480 IPS DPI LCD

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tinkerBOY
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Re: Testing a new 3.5” 640x480 IPS DPI LCD

Post by tinkerBOY » Tue Sep 03, 2019 12:06 am

I'm not really sure as I'm just learning about this initialization thing on this lcd but looking at the Hyperpixel, it looks like there's a program that runs once and writes codes to it via spi on the Raspberry Pi to initialize it. So if its just a one time write to initialize the lcd then it would make sense to just remove the mcu that does the initialization and just initialize the lcd at the factory with an external programmer like maybe Arduino Uno or something. :)
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Re: Testing a new 3.5” 640x480 IPS DPI LCD

Post by floppes » Tue Sep 03, 2019 9:20 am

The initialization data is usually not stored in the LCD controller. You have to initialize it on every power up.
The parameters are not trivial, especially if you have to write a gamma table. You will need to ask the manufacturer for the correct initialization data or sniff it [;)]

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Re: Testing a new 3.5” 640x480 IPS DPI LCD

Post by tinkerBOY » Tue Sep 03, 2019 3:20 pm

floppes wrote:
Tue Sep 03, 2019 9:20 am
The initialization data is usually not stored in the LCD controller. You have to initialize it on every power up.
The parameters are not trivial, especially if you have to write a gamma table. You will need to ask the manufacturer for the correct initialization data or sniff it [;)]
You’re right I just talked to one of the manufacturers and he said it needs the initialization every power up.
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Re: Testing a new 3.5” 640x480 IPS DPI LCD

Post by Bad_Robot » Sun Jan 26, 2020 2:53 pm

tinkerBOY, do you know if the screen you tested is still available somewhere (without MCU) ? or if there is an equivalent ? (640x480 compatible with your DPI adapter)

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Re: Testing a new 3.5” 640x480 IPS DPI LCD

Post by tinkerBOY » Sun Jan 26, 2020 4:49 pm

Bad_Robot wrote:
Sun Jan 26, 2020 2:53 pm
tinkerBOY, do you know if the screen you tested is still available somewhere (without MCU) ? or if there is an equivalent ? (640x480 compatible with your DPI adapter)
I might be able to sell this screen maybe 1-3 months from now.
New! tinkerBOY PowerSwitch v1.0 with Safe Shutdown
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tinkerBOY Controller v1.1 - simple pcb button
* DPI Adapter - better display for GBZ
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