Wide Small

The document introduces how to drive the small size EPD with OTP LUT.

They include the 1.52”, 1.54”, 2.06”, 2.13”, 2.66”, 2.71”, 2.9”, 3.5”, 3.7”, 4.2” and 4.37” wide temperature EPDs.

These EPDs use single driver and embedded T-con. The major control interface of the driver is SPI.

The host sends both the setting commands and the display image to driver through the SPI bus.

Definition of Operation Modes

The section will define the OTP memory and clarify update modes.

OTP memory

The OTP memory of the screen controller contains all the parameters to initialise the screen, as well as the waveforms for normal and fast update. The waveforms are specific to each batch of screens and set for optimal image quality.

The host needs to read the 2-byte PSR (panel setting) values from the OTP memory with the 0xa2 command once, as long as it retains the values.

Details of this operation are found in Read the OTP data.

Update modes

The screen supports two update modes.

• Normal update will perform the complete waveform for image update. The process will go through the inverse, flashing and imaging phases. The mode will take more time, but it will bring better image performance.

• Fast update executes the faster waveform. COG compares the pixel data of the current image and the new image pixel by pixel, and then only drives the transition pixels. The mode can quickly complete the image update.

Panel Drawing

1.52"

1.54"

2.06"

2.13"

2.66"

2.71"

2.9"

3.5"

3.7"

4.2"

4.37"