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The different types of E ink imaging film
| E ink film type | Temperature range | Colors | Operating temperature | Storage temperature | Remark |
| Aurora | Zero above | black, white
(BW) | 0°C to +50°C | -20°C to +60°C | Standard monochrome display for most indoor operating conditions.
Support fast updates. |
| Aurora -25 | Freezer | black, white
(BW) | -25°C to +30°C | -25°C to +60°C | Suitable for freezing operating conditions. |
| Wide Temperature | Wide | black, white
(BW) | -15°C to +60°C
(Fast Update: 0°C to +50°C) | -20°C to +70°C | New generation of our unique monochrome display and support fast updates. |
| Spectra Red | Zero above | black, white, red
(BWR) | 0°C to +40°C | -25°C to +60°C | 3-colors pigments inside.
Taking longer time to complete a refresh. |
| Spectra 4 | Zero above | black, white, red, yellow
(BWRY) | 0°C to +40°C | -25°C to +60°C | New generation of color display upgraded by BWR to provide additional yellow. |
How to make your selection?
–Refresh cycle
- Note that EPDs are suitable for refresh cycles (global update, full screen update) from tens of seconds to minutes.
- Fast update rate (partial update – few hundred milliseconds) is feasible but please share your requirements with us for further support.
- An EPD is more suitable for applications where a static image is maintained without electricity and doesn’t need to be refreshed frequently.
–Temperature & colors
- Determine whether the operating temperature or color is the primary requirement for your product or use case.
- If having red or yellow as one of the EPD colors is a primary requirement, note that Spectra EPDs cannot be operated at sub-zero temperatures.
- If you need your product to operate under 0℃, wide-temperature EPD (black and white) will be the only suitable model. Selecting Freezer if your case needs down to -25℃.
- We recommend selecting Wide Temperature if it is not essential that you have a three- or four-colors display.
Driver comparison of iTC and eTC
Driver type | iTC (internal timing controller) | eTC (external timing controller) |
| EPD with host board |  |
| Waveform location |  |  |
| Driving waveform | Embedded in driver IC (CoG) | Controlled by MCU |
Customization / Design flexibility | Normal | Higher |
| Design-in effort | Easier | Normal |
| Power consumption | Normal | Lower |
| Explanation |
- The driving waveforms (LUTs, lookup tables) have been pre-programmed in the driver IC. Developers just need to send image data and update command to complete the screen refresh.
- If developers need special support to change the waveforms, extra LUTs can be sent externally.
|
- Following our driving guide, developers can fully control the driving flow and stage from the MCU.
- Developers need to send converted image data at each specific stage.
- Taking longer time to design-in.
- Longer initial, power-up and power-off periods. (500ms above)
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