The WORKBENCH part 2

End Devices (Nodes) Hardware
41

Monochrome OLED Display Power Consumption

I previously did some measurements of OLED display power consumption in:
Big ESP32 + SX127x topic part 2

I removed the voltage regulators from four of the OLED displays (B, D, E and I, note that display numbering is not identical to my previous test) to see how much power consumption would drop when the display is switched off (from software) and the power consumption with display off dropped substantially (see column VReg removed). This difference is caused by the quiescent current of the regulator.

For some displays where the regulator is removed the power consumption when the display is on increases a little bit. This can be explained by the following: when the OLED board is provided with 3.3V supply voltage the display will get slightly less due to the regulator’s dropout voltage. When the regulator is removed there is no dropout so the display will get a slightly higher (3.3V) supply voltage.

All displays are blue, use I2C interface and use pin order GND, VCC, SCL, SDA. All 
displays came with a XC6202 3.3V voltage regulator (code 662K) for 5V/3.3V operation.
From four displays the regulator was removed to minimize current usage when display
is off to make suitable for (3.3V based) low-power applications.

Disp off is display off/powersave/sleep.
Disp off VReg removed is after the 3.3V voltage regulator was removed from the PCB.
% pixels: display on and % pixels is the percentage of pixels that are lit.

Display Type            Disp off    Disp off      0% pixels 50% pixels  100% pixels
                                    VReg removed  
                                                                 
A       0.96" 128x64    13.7uA                    1.4mA      8.7mA      11.4mA
 
B       0.96" 128x64    12.8uA                    1.5mA      9.6mA      13.2mA 
                                    3.2uA         1.5mA      9.7mA      13.3mA
									
C       0.96" 128x64     7.7uA                    1.6mA     14.7mA      24.3mA 

D       0.96" 128x64    32.5uA                    1.5mA      9.9mA      14.1mA 
                                    4.1uA         1.5mA      9.9mA      14.2mA
									
E       0.96" 128x64     7.0uA                    1.5mA     16.4mA      29.4mA
                                    1.2uA         1.5mA     16.7mA      30.2mA
									
F       0.96" 128x64     8.4uA                    1.5mA     16.1mA      27.9mA

G       0.96" 128x64     7.0uA                    1.5mA      9.9mA      13.2mA 

                                                            
H       1.3" 128x64      7.4uA                    2.2mA     22.4mA      30.1mA 

                                                            
I       0.91" 128x32     8.3uA                    2.2mA     16.7mA      21.8mA 
                                    1.2uA         2.2mA     16.7mA      21.8mA

J       0.91" 128x32     8.1uA                    2.0mA     18.7mA      33.1mA
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