Hi there,

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I am relatively new to the world of microcontrollers but have had a little bit of experience with displays as I have cobbled together / adapted a driver for an ili adafruit SPI display.

Moving on from this I have my sights set a bit higher but want to check whether what I am thinking is possible and if anyone has any of the information I can't find.

I am looking to use a round AMOLED display with an ESP32 and have found 2 basic options (with a 3rd that is slightly different). I have found some displays based on an RM display driver (such as this: 1.39 Inch Ips 454x454 Rohs Round Oled Display Module Lcd - Buy Smart Touch Panel,Ips Touch Panel,Amoled Panel Product on Alibaba.com ) which seems to support MIPI and SPI, which seems to be backed up by the vague pinouts I have seen that have SPI labled pins. The other lookks to be driven by an RM display driver that only appears to have MIPI pinouts and so wouldn't be suitable to be used with an ESP32. As another option there is something like this larger screen that appears to support SPI/RGB: 2.1 inch round lcd display 480x480 color tft RGB/MIPI interface

One problem I am running into is that I cannot find a datasheet for the RM, or any written drivers, which would make it very difficult to use the screen.

Additionally I am not sure what I would need to plan in terms of additional components (resistors, capacitors, etc.) to use the screen as I assume they would be needed.

Does any one have any experience with any of these screens or know of anywhere with a write up or code detailing them?

Thanks in advance for any advice you might have.

What is AM-OLED Display&#;Full-Color OLED&#;?

AM-OLED stands for Active Matrix OLED (or, in full, Active Matrix Organic Light Emitting Diodes). Compared to traditional TFT screens, AM-OLED screens offer a number of advantages, including faster response speeds, self-illumination, excellent display effects, and lower power consumption. 
These advantages mean OLED displays are able to display pure black, offer higher contrasts, deliver more vivid colors, and can be used in direct sunlight, all while using relatively little power. Taken together, this explains why AMOLED displays are so well suited for use in handheld, military equipment, gaming, and sports-related devices.

It need big investment to produce AMOLED, there are less than 20 companies can produce AMOLED all over the world, the major manufacturers of AMOLED contains Samsung, BOE, EDO, GVO(Visionox), Tianma, Innolux, AUO, Truly, etc.

If you want to learn more, please visit our website ORIC Electronics.

Structure of AM-OLED Display

Substrate layer: The bottom layer is made of glass or plastic and acts as a base for the entire AMOLED structure.
Anode layer: The anode layer is made up of a transparent electrode material such as indium tin oxide (ITO) that is coated on the substrate layer. It helps in providing an electric charge to the OLED material.
Organic layer: The organic layer consists of a thin layer of organic materials that are responsible for emitting light when an electric charge is applied. It is made up of various sub-layers, including a hole injection layer, a hole transport layer, an emissive layer, and an electron transport layer.
Cathode layer: The cathode layer is made up of another transparent electrode material such as aluminum or silver that is deposited on top of the organic layer. It helps in extracting electrons from the OLED material.
Thin-film transistor (TFT) layer: The TFT layer is a layer of transistors that are responsible for controlling the flow of current to the OLED material. It is located behind the organic layer and is used to individually address each pixel in the display.

Advantages of AM-OLED Display

Wide Operation Temperature Range