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Show HN: Raspberry Pi 400 with a $2 IPS 240x240 micro display

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Re: Show HN: Raspberry Pi 400 with a $2 IPS 240x240 micro display

#21

Post by cxcorp »

nrp wrote: post #14
fermienrico wrote: post #12

There is a weird spot in the display market that is painful as a embedded developer: Displays under 400x240 pixels, usually the gfx buffer can be managed in the ram of the MCU. Nothing fancy needed, can get decent framerate on SPI bus running at 16 MHz. Anything above this range gets super ugly: no good displays exist and if they do, they're expensive or outdated (800x480 resolution is basically impossible to obtain)…

It's an interesting challenge, but MIPI DSI is sort of the right interface for small size displays too high resolution to drive with SPI. There are a range of Cortex-M4 and M7 MCUs that have DSI output (e.g. https://wiki.st.com/stm32mpu/wiki/DSI_internal_peripheral ). The solution is probably just better documentation for the panels and their DDICs.

Oh wow, I didn't even know ST had a wiki! I wonder if they also have a section on the STM8 family?

Re: Show HN: Raspberry Pi 400 with a $2 IPS 240x240 micro display

#22

Post by kgin »

wang_li wrote: post #19
fortran77 wrote: post #16

You may think this is "tiny", but I got a lot done on my Apple ][ back in 1978 with a 280x192 pixel display.

You’re 280x192 pixel display was probably 13” or even larger. This display is 1”x1”. You can get about six lines of 12-15 characters on it if you want to be able to read it from further than 6” away.

With the right lens, you could have the start of Pi Goggles

Re: Show HN: Raspberry Pi 400 with a $2 IPS 240x240 micro display

#23

Post by joezydeco »

inamberclad wrote: post #8
opendomain wrote: post #7

what are the specs form this display? the title says 240x240, but what size? How many colors and refresh rate?

It looks like I2C, so it's probably damn slow.

They're SPI driven and store their own pixels. You don't need to clock it like a parallel display.

Re: Show HN: Raspberry Pi 400 with a $2 IPS 240x240 micro display

#24

Post by fy20 »

kgin wrote: post #22
wang_li wrote: post #19

Earlier quoted context omitted.

You’re 280x192 pixel display was probably 13” or even larger. This display is 1”x1”. You can get about six lines of 12-15 characters on it if you want to be able to read it from further than 6” away.

With the right lens, you could have the start of Pi Goggles

8bit VR sounds interesting :-)

Re: Show HN: Raspberry Pi 400 with a $2 IPS 240x240 micro display

#27

Post by noisy_boy »

TedDoesntTalk wrote: post #3
ISL wrote: post #2

There's a lotta cool/interesting applications for a tiny display like that. Thanks for sharing. :).

Other than watch-like functions, can you give me some ideas?

How about embedding them in a split keyboard in the middle so I don't even need to move my hand off the keyboard? E.g. I can just touch and jump to any part of the open file? Won't be very accurate due to the small size but sometimes I just need to go to a specific section and then I can scroll.

Re: Show HN: Raspberry Pi 400 with a $2 IPS 240x240 micro display

#28

Post by evan_ »

fy20 wrote: post #24
kgin wrote: post #22

Earlier quoted context omitted.

With the right lens, you could have the start of Pi Goggles

8bit VR sounds interesting :-)

There was very nearly a 16 bit VR platform for the Sega Genesis:

https://gamehistory.org/segavr/

Re: Show HN: Raspberry Pi 400 with a $2 IPS 240x240 micro display

#30

Post by ehnto »

noisy_boy wrote: post #27
TedDoesntTalk wrote: post #3

Earlier quoted context omitted.

Other than watch-like functions, can you give me some ideas?

How about embedding them in a split keyboard in the middle so I don't even need to move my hand off the keyboard? E.g. I can just touch and jump to any part of the open file? Won't be very accurate due to the small size but sometimes I just need to go to a specific section and then I can scroll.

I guess the line number and use the jump to line shortcut.
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