12864 lcd chip on glass — 128 x 64 chip on glass (COG) LCD modules that run from a 3.0 V or 3.3 V supply, driven by an ST7567 controller at 1/64 duty and 1/9 bias. The MLG12864J-8 brings the interface out as SPI, which keeps the pin count low on small MCUs.
Specifications
| Model | MLG12864J-8 (SPI), MLG12864J-35 (parallel) |
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| Resolution | 128 x 64 dots |
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| Build | COG (chip on glass) |
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| Interface | SPI (MLG12864J-8), parallel (MLG12864J-35) |
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| Driver IC | ST7567 |
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| Drive method | 1/64 duty, 1/9 bias |
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| Driver voltage | 3.0 V / 3.3 V |
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| Dot size | 0.45 x 0.49 mm |
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| Display mode | yellow-green / blue, STN / FSTN / FFSTN optional |
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| Viewing direction | 6 o'clock |
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| Operating temperature | -20 to +70 degree |
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| Storage temperature | -30 to +80 degree |
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Compare with nearby graphic LCD sizes
| Resolution | Driver IC | Build | Backlight |
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| 128 x 32 | ST7567A / KS0108 | COB / COG | White LED |
| 128 x 64 COG | ST7567 | COG | White LED (transmissive / transflective) |
| 128 x 64 COB | KS0108 / SBN0064G | COB | White LED |
FAQ
Does the 128x64 COG module come with a backlight?
It depends on the polariser. Transmissive and transflective builds carry a white LED backlight. Transflective adds a reflective layer behind the cell, so it stays readable in daylight with the backlight switched off, which is what battery powered outdoor instruments use. A reflective build has no backlight at all and relies entirely on ambient light.
Is there a library for the 128x64 ST7567 display?
Yes. The ST7567 is covered by the u8g2 and u8glib libraries on Arduino, ESP32 and STM32, so text, fonts and bitmaps can be drawn without writing a driver from scratch.
How much memory does the 128x64 frame buffer take?
128 x 64 dots at 1 bit per dot is 1024 bytes. That fits inside an ATmega328, but leaves little headroom, so many designs write directly to the controller RAM instead of keeping a shadow buffer.
Can the 128x64 COG be supplied with an FPC connector instead of pins?
Yes. The COG build is normally terminated with an FPC tail, and the pin pitch, tail length and a mating ZIF or solder connector can all be specified for production.
