Exclusive 1.38″ Round TFT LCD
The uLCD-220RD is a unique 1.38″ Round LCD Intelligent Display Module powered by the 4D Systems DIABLO16 Graphics Processor.
The uLCD-220RD is designed for applications such as gauges and instruments or for special applications such as robotics.
Driving the display and peripherals is the DIABLO16 processor, a very capable and powerful chip which enables stand-alone functionality, programmed using the 4D Systems Workshop 4 IDE Software. The Workshop IDE enables graphic solutions to be constructed rapidly and with ease due to its design being solely for 4D graphics processors.
The display module has an array of features including PWM, micro-SD memory storage, general purpose I/O including Analog Inputs, multiple TTL Serial, I2C and SPI channels, Quadrature Input, Pulse Output and multiple millisecond resolution timers, amongst many more features.
The uLCD-220RD features a 30 way 2.54mm pitch male pin header, where all of the IO available on the Diablo16 processor have been broken out for the User. It also features a 10 way 2.54mm pitch male pin header which is common to a majority of 4D Systems display modules, and is used for programming the module with our Workshop4 IDE, using a Programming Cable or Adaptor.
If you are after a unique display solution for your project, maybe an Automotive Gauge or Instrument Dial, or even a Robot Head, look no further than the 4D Systems uLCD-220RD Round TFT LCD Intelligent Display Module.
** NOT RECOMENDED FOR NEW DESIGNS **
Information about this Display Module
- Powerful 1.38″ Intelligent LCD-TFT display module powered by DIABLO16.
- 220 x 220 Resolution (Round), RGB 65K true to life colours with LED Backlight.
- Easy 5 pin interface to any TTL Serial Host:
- VCC, TX, RX, GND, RESET
- 6 banks of 32750 bytes of Flash memory for User Application Code and Data
- 32Kb of SRAM purely for the User.
- 16 General Purpose I/O pins for user interfacing, which include 4 configurable Analog Inputs.
- The GPIO is variously configurable for alternative functions such as:
- 3x I2C channels available
- 1x SPI dedicated for SD Card and 3x configurable SPI channels available
- 1x dedicated and 3x configurable TTL Serial comm ports available
- Up to 6 GPIO can be used as Pin Counters
- Up to 6 GPIO for PWM (simple and Servo)
- Up to 10 GPIO for Pulse Output
- Up to 14 GPIO can be configured for Quadrature Encoder Inputs (2 channels)
- On-board micro-SD memory card connector for multimedia storage and data logging purposes
- DOS compatible file access (FAT16 format) as well as low level access to card memory
- Dedicated filtered PWM Audio pin driven by WAV files from micro-SD card, and external amplifier enable pin allows easy connection to an external amplifier for audio playback
- Display full colour images, animations, icons and video clips on chosen 4D Systems display
- Supports all available Windows fonts
- 4.0V to 5.5V range operation (single supply)
- Module dimensions: 42.4 x 46.9 x 14.1mm
- Weight ~15 g
- Display Viewing Area: Round 35.1mm Diameter
- RoHS Compliant
- CE Compliant
The uLCD-220RD includes the following items:
- uLCD-220RD round Intelligent Display Module
- 150mm 5 way Female-Female jumper cable
- 5 way Male-Male adaptor
- Getting Started Manual available as a Download
If you are a first time user and just beginning your development, we strongly recommend purchasing a Starter Kit of this same model as it includes additional items that allow you to get started with your development immediately.
Starter Kit part number is SK-220RD.
SPECIFICATIONS
Diagonal Display Size INCHES | 1.38 |
---|---|
Resolution | 220×220 |
Brightness | 171 cd/m2 |
Touch | Non-Touch |
Controller | DIABLO16 |
Operating Ambient Temperature | -20°C to +70°C |
Storage Temperature | -30°C to +80°C |
Connector | 5 pin Interface |
lay Viewing Area (mm) | 35.1 Diameter |
Module Dimensions (mm) | 42.40 x 46.90 x 14.10 |
RoHS? | Yes |
Country of origin | Australia |
CCCN / tarif code | 85312000 |
ECCN export control code | EAR99 |
TARIC Code | 8531209590 |
AHECC Code | 85312000 |
Package Dimensions L x W x H (mm) | 107 x 76 x 36 |
Product Weight (g) | 15 |
Weight with Packaging (g) | 32 |
REACH | Yes |
CE Mark | Yes |
Supply Voltage | 4.0V-5.5V DC |
Supply Current | 150mA |
Frame Rate | 21.3 fps |
colours | RGB 65K |
Processor Capability | 1220K Pixels / second |
SD Card Slot | Yes – RAW or FAT16 Support. SPI Compatible microSD Cards Only |
Lithium Charger Circuit | No |
Flash | 6 banks of 32KB |
RAM | 32KB SRAM |
I2C | 3 x Channels |
GPIO | 16 x GPIO |
SPI | 3 channels available |
Codeless Programming | Yes |
IDE | 4D Workshop4 IDE |
Serial Speed | 300 to 2187500 baud |
Serial Interfaces | 1 x dedicated and 3 x configurable |
8-bit Parallel Transfer | Yes |
Viewing Angle | Standard Viewing Angle |

SIZE & WEIGHT
Viewing Area: 35.1 Diameter
Module Width: 42.40 mm
Module Height: 46.90 mm
Module Depth:14.10 mm
Module Weight: 15 g

WORKSHOP4 IDE
Workshop4 is a comprehensive software IDE for Microsoft Windows that provides an integrated software development platform for all of the 4D family of processors and modules. The IDE combines the Editor, Compiler, Linker and Downloader to develop complete 4DGL application code.
All user application code is developed within the Workshop4 IDE.
DEVELOPMENT ENVIRONMENTS THAT SUITS ANY APPLICATION & USER LEVEL
Workshop4 includes four development environments for the user to choose based on application requirements or even user skill level.


WORKSHOP4 PRO
Make complex widget design, simple.
Smart Widgets Editor is a powerful utility which enables the generation of Smart Widgets.
GENIE MAGIC
Genie Magic is an extension to ViSi-Genie, which is available in Workshop4 PRO. Genie Magic allows the User to add 4DGL code to various points in the ViSi-Genie backend code, which allows Users to take full advantage of the power of 4DGL, while retaining the speed and convenience of ViSi-Genie and its defined communication protocol.
Genie Magic allows you to enter 4DGL code in the form of Events, Code and Objects, along with various touch related additions too, giving you to the power to achieve advanced GUI’s in ViSi-Genie without having to write the full code yourself.
Genie Magic is fully supported by the genieArduino and geniePi libraries, making communication with an Arduino or Raspberry Pi host even more powerful.
When using Genie Magic in combination with the Smart Widget Editor, it is possible to use the Smart Widgets Editor tool and Smart Widgets to create other graphical user interface elements such as:

DOWNLOADS
Compatibility:
Workshop4 is a Windows-only product. It is compatible with Windows 8 through to Windows 11.
Note some older OS such as ME, Vista, XP and 7 have not been tested for some time and are not supported by Microsoft anymore; however, they may still work.
Legacy support updates for the older OS may not be possible, depending on what issues are found. For best results, run a current Windows OS.
It is possible to run Workshop4 under a VM on Linux or Mac. However, it is up to the User to set this up.
Documentation
DIABLO Processor Documentation
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- 1.38″, 220×220 pixels, unique round Intelligent Display Module.
- Ready to become the GUI for your target application and capable of being an interface controller for a number of applications.
- Starter Kits available for first-time users.
- Bundles with hardware interface boards for Arduino and Raspberry Pi also available.
- See the product description below for more details.
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We are delighted to offer volume discounts to qualified customers and organisations.
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We are delighted to offer volume discounts to qualified customers and organizations.
Our dedicated Volume Sales team will address your specific requirements and help you get an accurate quotation in a timely manner.