Display recommendations needed (1 bit graphic LCD, 128x64 or 256x128, serial) - Page 1
Forum section: electronics / projects

author: Professzore
author_rank: Contributor
timestamp: July 29, 2023, 07:50:02 pm
content: Hi,After nearly a hundred hours of continuous agony to find a solution to the problem mentioned a while ago [https://www.eevblog.com/forum/projects/st7920-128x64-display-_sometimes_-flickers-any-solution/msg4958071/#msg4958071]see here: https://www.eevblog.com/forum/projects/st7920-128x64-display-_sometimes_-flickers-any-solution/msg4958071/#msg4958071], finally, my customer decided to switch to a new solution.I made a rather broad research for most suppliers (available within the EU and outside of it), and found... Well, nothing too much. At least, only a fraction which were available back in about 15 years, when I last worked with such a display.We need:minimum 3,2 inch and a maximum of 5 inch diagonal size (4:3 ratio),minimum active display height is 34 mm,1 bit graphic LCD with a resolution of128 x 64or 256 x 128 pixel,serial (preferably SPI) data line,backlight color is not a key point, but as long as it can be colour-changing (RGB), it's a nice addition,standalone/module (main board and display will/shall be separated), the display will be mounted on the back/inner side of front panel3.3 V logic supply, general supply may be either 5 V or 12 V or (nearly) anything in between,acceptable readability from nearly any viewing angle(from +40 to -60),ROHS-compliant(with valid documentation),the best is if the driver chip is still in production andwell documented,absolutelyno touch capability needed,working environment may be from -10 degrees Celsius to +50 degrees Celsius range,price limit is about 35 EUR / 40 USD, delivered, expected quantity is in the 100 pieces range (samples and/or 2-3 pieces low-quantity orders must be available for prototyping),sources must be reliable with plannable deliveries, it's better to be within the EU.Ideas for alternatives are welcome.I couldn't find OLED displays in this size range, and most "intelligent" solutions are (way) over budget (and not necessary for this purpose). Years back, this kind of display was wildly available with an acceptable selection of driver chips, sizes, LCD technologies, and backlight options. Now I barely can see anything which meets all the criteria.Custom-made LCD may be a very good option, but the quantity may send the cost into the stratosphere.I highly appreciate any hints or suggestions.Yours sincerely,Tamás

author: Benta
author_rank: Super Contributor
timestamp: July 29, 2023, 09:18:09 pm
content: Try Densitron, they make this kind of thing.

author: Hawaka
author_rank: Regular Contributor
timestamp: July 29, 2023, 09:23:05 pm
content: https://www.buydisplay.com/get recommended quite often around here, did you check them out?

author: PCB.Wiz
author_rank: Super Contributor
timestamp: July 30, 2023, 12:01:46 am
content: Quote from: Professzore on July 29, 2023, 07:50:02 pmI think TFT LCD's have moved to dominate the small display space, making other parts more niche and thus harder to get/find.Can you start with your display size requirement and ignore the pixel count ?OLED seem to be approaching 3 inch, but I found none in your desired aspect ratio.Addit: using the link above, even epaper displays could now be inside your price/size limits.How often does this refresh ?

author: Professzore
author_rank: Contributor
timestamp: July 30, 2023, 05:01:02 pm
content: Hi,Quote from: PCB.Wiz on July 30, 2023, 12:01:46 amThanks for the answer.Same conclusions here...Epaper wouldn't be a problem as long as the proper amount of light is available. The refresh rate is 4-6 Hz.With thesize/pixel countproblem. Sure. Though, if anything changes, I should re-design and refactor the whole visualization part (UI), which may take nearly no time, when the pixel count (128 × 64) remains the same, and some time (hours) if it doubles. As more changes come up, or with the ability to handle colors, it may take days.34 mm active area vertical size is the bare minimum.Even Nextion / 4D Systems / NewHaven Display are on the B-list, but due to price considerations, they'll be only the „last chance”.Quote from: Hawaka on July 29, 2023, 09:23:05 pmI did. I made a fast research about 2 months ago, without any luck. I'll check it again in higher attention. Thanks for the suggestion.Quote from: Benta on July 29, 2023, 09:18:09 pm

author: DavidAlfa
author_rank: Super Contributor
timestamp: July 30, 2023, 05:37:25 pm
content: 4.7" 240x128, thought those sizes aren't cheap.https://www.buydisplay.com/touch-graphics-lcd-display-240x128-module-t6963-compatible-ra6963$10 +$7 shipping, 240x128 4.7"https://www.aliexpress.com/item/32899400101.html$6 +$3 shipping 128x64 3.24"https://www.aliexpress.com/item/1005002830238185.html

author: MarkL
author_rank: Unknown
timestamp: July 30, 2023, 08:47:42 pm
content: This is on the minimum size and resolution side of your requirements, but I've used this display for several low volume products (100's):https://www.digikey.com/en/products/detail/displaytech/64128M-FC-BW-3/6650335Good price, built-in backlight, crisp dots, and fast response for non-annoying UI feedback. Not a touchscreen.Also available from Mouser, Arrow, and the usual suspects, and has always been well stocked in my experience.

author: Martinn
author_rank: Frequent Contributor
timestamp: August 01, 2023, 07:01:00 am
content: COG modules from herehttps://www.lcd-module.com/produkte/dog.html