128x128 monochrome COG lcd display module — A square 128 x 128 dot monochrome COG module with a 2.4 inch diagonal, driven by a UC1617 controller at 1/128 duty and 1/12 bias, with a 0.275 x 0.295 mm dot pitch for fine graphics.
Specifications
| Model | MLG128128J-5 |
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| Resolution | 128 x 128 dots |
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| Build | COG (chip on glass) |
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| Diagonal | 2.4 inch |
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| Outline | 50.40 x 56.40 x 4.20 mm |
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| Dot size | 0.275 x 0.295 mm |
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| Driver IC | UC1617 |
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| Drive method | 1/128 duty, 1/12 bias |
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| Driver voltage | 3.0 V / 3.3 V |
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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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Compare with nearby graphic LCD sizes
| Resolution | Driver IC | Build | Backlight |
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| 128 x 64 COB | KS0108 / SBN0064G | COB | White LED |
| 128 x 128 | UC1617 | COG | White LED (transmissive / transflective) |
| 192 x 64 | SBN0064G | COB | White LED |
FAQ
How much memory does the 128x128 frame buffer take?
128 x 128 dots at 1 bit per dot is 2048 bytes. On an 8-bit MCU that is more than half of the available RAM, so most designs keep the image in the controller's internal display RAM and redraw only the regions that change.
Is the UC1617 supported by common graphics libraries?
Yes. The UC1617 is covered by u8g2, so fonts, icons and bitmap drawing work on Arduino, ESP32 and STM32 with a standard driver setup.
Why pick a square 128x128 instead of a 128x64?
The square format suits icons, dials and small graphics better than the wide 128 x 64, and it avoids rotating the layout. It needs twice the display RAM, so it fits designs with a larger microcontroller.
Can the 128x128 be read without a backlight?
Yes, with a transflective or reflective polariser. Transflective keeps the white LED backlight and reads ambient light as well, so the backlight can be switched off in daylight to save power. A reflective build has no backlight at all, which suits instruments that run for years on a battery.
