Do Low Temperature EPDs Work under High Temperature Conditions?
Posted By: swicn
Date: 19/07/2021
Are there any EPDs that can work under sub-zero temperature condition?
The temperature range for regular E-paper matrix displays is 0-50℃, however there are some EPDs designed for low temperature condition. These EPDs use low temperature E-ink film which operating temperature ranges from -25℃ to +10℃. SWI has 3 low temperature EPD models which are sized in 2.13”, 2.66” and 2.9”.
Can we use low temperature EPDs under high temperature?
Some customers asked us what will happen if they use our low temperature EPDs under high temperature condition. We have tested our three low temperature EPD models under different temperatures and seen how they looked. Please see the below test report:
SWI Low Temperature EPDs Verification Test Report
Samples Tested
2.13”, 2.66” and 2.9” low temperature EPDs (also called Freezer EPD).
5 samples of each size under each temperature are tested.
Test Purpose
To verify the display conditions of Freezer E-paper displays under different temperatures (-25℃, 50℃, 55℃, 60℃).
As -25℃ ~+10℃ is standardized temperature range for these Freezer EPDs, has been already verified without display problems, so we are mainly focusing on the verification of low temperature (-25℃) and high temperatures (50℃, 55℃, 60℃) during this testing.
Test Conditions:
-25℃: 5 samples for 48 hours
50℃: 5 samples for 48 hours
55℃: 5 samples for 48 hours
60℃: 5 samples for 48 hours
Measurement Instruments:
Temperature Control: ESPEC
Optical Measurement: i1pro
Test Conclusions:
- The low temperature EPD samples display well under -25℃.
- The Freezer EPD samples don’t display very well under 50℃, 55℃, and 60℃. The image contents are still readable under 50℃, 55℃, and 60℃, but there is black flocculation displayed in the EPD film, and this flocculation gets more serious in higher temperature.
- It depends on the product applications to determine the usage experience of these Freezer EPDs under higher temperatures. We would suggest the customers test the samples under the specific temperatures under which they would use the product.
swicn
