#video on #3D-printing pneumatic logic display #mechanisms (incorrectly described as #fluidics) with FDM and silicone membrane to get 8×8 bistable pixels, which he can play Snake on. Each pixel has a single pneumatic vacuum valve (“transistor”) which permits vacuum to the display only when there is vacuum on both the column channel (providing the air current) and the row channel (opening the valve). To get airtight channels with FDM he prints slow, hot, and overextruded, which still wouldn’t give you the wall smoothness you need for fluidics. The multiplexing is rather slow because he’s driving the rather voluminous channels with solenoid-driven valves, getting speeds more like 8Hz than the 10kHz or so normally achieved with fluidics. The platinum-cured 25A silicone membrane’s smooth surface comes from the air-exposed surface of the silicone in a mold carefully leveled with a 2-dimensional bubble level; he tried using a different, commercially-made silicone membrane for the logic surface, but it had to be smooth and flat on both sides, and the commercial silicone sheet wasn’t smooth enough, so he cast his own with glass as the mold on the bottom side. To get the warped bottom surface of the 3-D print to be flat enough to seal well, he sealed it against glass in a vacuum bag and then annealed the assembly at 60° for several hours. Tiny raised concentric rings around the holes that have to make contact with the silicone membrane hopefully make the system more robust against small deviations from flatness. He 3-D prints Luer lock adapters for standard medical tubing, which connect to the logic board with O-rings. I feel like you could probably Charlieplex with this pneumatic-logic approach, and with silicone you might even get a reasonable lifespan, especially with less extreme flexions than the ones he demonstrates in the video. Amusing note: to speed up display updates, he seems to activate multiple rows simultaneously when their contents are identical, an approach which might work for other kinds of multiplexed #displays.
on 02026-08-24#history of 7-segment #displays
on 02026-07-20#video on #SAGE, the Semi-Automated Ground Environment, showing the #displays, which it looks like were circular, about 60 characters tall and 60 characters wide, typically displaying about 100 characters or vectors. #history
on 02025-12-11#PDF of IBM #SAGE CRT #displays manual explaining how they cloned the #Charactron #hardware wih a 63-character stencil disk
on 02025-12-11#memory-LCD #displays #hardware being used in a bicycle computer: “The MIP display utilizes LTPS ( Low Temperature Poly Silicon ) technology to form memory circuits in each pixel. Each of these pixels is addressable, containing a 1-bit memory cell for storing information. (...) Because of this, TFT displays have power consumptions more than 40 times higher, requiring more electricity than a MIP display.”
on 02025-11-05microscope #video of Sharp #memory-LCD #low-power #LCD #displays #hardware
on 02025-10-13"Shineworld" may be the actual manufacturer of #Osptek and #good-display’s #LCD #displays. #electronics #hardware #low-power
on 02025-10-13other #low-power #Osptek #LCD #displays: “2.9 inch IPS SPI Interface 8 color TFT Display”, YDP290H003-V3, 210×480, 31×71mm, 2.8V, 14.3μA, but this one has 8 colors! #electronics #hardware
on 02025-10-13#Osptek (Osprey Technology of Taiwan, Yuying #LCD) is a different manufacturer of #low-power #electronics #displays #hardware; this one, model YDP420H003-V3, is 300×400 pixels, 64×85mm, 2.8V, 30μA. “4.2 inch IPS SPI Interface R/B/W Reflective TFT Display.”
on 02025-10-13#good-display #low-power #electronics #displays #hardware #pricing: US$6.89 for 384×168 and ≈80μW active-matrix monochrome reflective TFT from #good-display.com
on 02025-10-13320×240 95×75mm #memory-LCD for US$75.22. #low-power #displays #hardware #electronics #pricing
on 02025-10-13#memory-LCD #low-power #displays #hardware, with a very nice faceted database query thing: the left margin is an accordion with a section for each field and a checkbox for each value of that field, while the main display area has a card with name-value pairs for each selected record. Apparently they currently have an “LS044Q7DH01” that’s 4.4" (95×75mm), 320×240 (“QVGA”), 100μW hold power, 600μW 1Hz update power. It costs US$75 at Digi-Key! #electronics
on 02025-10-13#EEVblog forum about the μTimer project, where he is going to use #low-power #LCD #displays from #good-display #electronics #hardware
on 02025-10-13usage guidelines for #e-ink (“e-paper”) #electronics #hardware #displays: “• ePaper displays are suitable for update cycles ranging from tens of seconds to minutes. • Most black-and-white ePaper screens have a fast refresh rate of 1.5-2.5 seconds.” #good-display
on 02025-10-12#EEVblog #video about #low-power #LCD #displays (like 14.3μA at 3.3V, up to 25μA during updates, 2.9" diagonal and 384×168) and why he prefers them to #e-ink: e-ink takes tens or hundreds of milliamps for a second or two to update. And service life is only 5 years or 10 million switches. He’s going to try the nice high-resolution ST7305-based #good-display.com (Dalian Good Display Co., Ltd.) reflective active matrix TFT LCD, even though the MOQ is 1000, because they sent him a demo board. It’s a nice high-contrast black and white and a very wide viewing angle despite (I think?) not being #memory-LCD. @mikeselectricstuff says the ST7305 datasheet says it supports up to 30Mbps over SPI. @afreestone101 says that if you peel the polarizer layer off the memory LCDs, the black color becomes mirror shiny. #electronics #hardware
on 02025-10-12ooh, tiny IPS TFT #displays #pricing down to US$6.37 for a 240×320
on 02025-08-13#OLED #displays pixel refresh measures the wear of each pixel and adjusts the drive electronics to compensate so you don’t get visible ghosting, just gradual dimming
on 02025-06-05Rdot Ynvisible #displays #hardware are advertised as 0.3μW/cm² plus 1mJ/cm² per update, and they claim that reflective LCDs use 6μW/cm²
on 02024-07-10#Technology-Connections #video on 01970 "Numitron" display devices from RCA: seven-segment #displays made of red-hot incandescent filaments in vacuum tubes, basically seven-segment 5-volt lightbulbs, 25mA per filament. He also shows IV-11 VFD tubes, a seven-segment clock he made in college out of LED tape, and a clock he made out of Numitrons, driving them directly from BCD decoder chips without separate driver chips. He catalogs the design errors in the Numitron: the digits don’t lean and so the decimal point makes them off-center; the segments are too thin to be legible; the segments are too far apart (they could have actually crossed in different planes); the vertical segments extend too far; the opaque support board behind the filaments is grey rather than black, reducing contrast and blurring the segments; and the numbers are slightly crooked due to imprecise assembly of the tubes. The Russian clones are even worse.
on 02024-07-02Nicolas Magnier #video of video on a #memory-LCD. 60fps on the 400×240 SHARP memory-in-pixel LCD. #displays
on 02024-05-07#calculators #displays including VFDs and 8-segment layouts
on 02022-08-23The #PDF #datasheet for the PCD8544 #cellphone #displays #hardware controller used in the Nokia 5110 and 3310
on 02017-04-26an #Arduino driver for #cellphone #displays #hardware
on 02017-04-26driving the #cellphone #displays #hardware from the Nokia 3310 (84×48 PCD8544) from a PIC12
on 02017-04-26#PDF on driving the #cellphone #displays #hardware from the Nokia 5110 or 3310, which is a 84×48 PCD8544
on 02017-04-26an #Arduino library for driving #cellphone #displays #hardware with the Toshiba T6963 controller, from 2011
on 02017-04-26driving the Epson S1D15G10 pseudo-Nokia #cellphone #displays #hardware from an #Arduino
on 02017-04-26overview of running #cellphone #displays #hardware with microcontrollers
on 02017-04-26code for driving Nokia 5210 LCD #cellphone #displays #hardware with SPI from an #Arduino Leonardo using the Adafruit PCD8544 library
on 02017-04-26driving Nokia 5210 LCD #cellphone #displays #hardware with SPI from an #Arduino Leonardo using the Adafruit PCD8544 library
on 02017-04-26Library for driving Nokia 1100 (96×65) and compatible PCF8814 #cellphone #displays #hardware with an #Arduino
on 02017-04-26The 96×65 Nokia 1100 LCD #cellphone #displays #hardware uses a PCF8814 and can be driven with SPI from an #Arduino
on 02017-04-26Driving #cellphone #displays #hardware that uses a PCF8833 (like many old Nokia displays) using bitbanged SPI from an #Arduino
on 02017-04-26#PDF #datasheet for #cellphone #displays #hardware controller PCF8833, used in many old Nokia 132×132 phone displays
on 02017-04-26Andy Brown running the #cellphone #displays #hardware from a Nokia N82 on an #Arduino Uno using PORTD for the parallel interface; he reaches like 700 kilopixels per second of fill rate
on 02017-04-26more detail on Andy Brown #reverse-engineering QVGA RGB #cellphone #displays #hardware from a Nokia N82
on 02017-04-26Andy Brown #reverse-engineering QVGA RGB #cellphone #displays #hardware from a Nokia N82, using a parallel interface
on 02017-04-26