0.71inch LCD Module

0.71inch LCD Module 0.71inch, 160×160, SPI

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Onboard Interfaces SPI

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Overview

Introduction

The 0.71inch circular LCD module features an IPS display, with 160 x 160 pixels, equipped with an integrated GC9D01 driver chip, and utilizes SPI interface communication. It is suitable for integration into controllers such as ESP32, Raspberry Pi Pico, Arduino, etc., and can be used in creative applications like simulated electronic eyes or wearable devices.

Specifications

Operating voltage	Communication interface	Display panel	Control chip
3.3V/5V	4-wire SPI	IPS	GC9D01
Resolution	Display size	Pixel pitch	Dimensions
160 × 160 pixels	18 × 18 (mm)	37.5 × 112.5 (μm)	20.12 × 22.3 (mm)

Pin Definition

Operating Principle

LCD and its Controller

This LCD uses the built-in GC9D01 driver, with a resolution of 160×160. It has an internal GRAM and supports 12/16/18-bit data bus MCU interfaces, i.e., RGB444, RGB565, RGB666 three color formats, which are common RGB formats.
For most LCD controllers, the communication interface can be configured, including 8080 parallel, 3-wire SPI, 4-wire SPI, etc. This LCD uses a 4-wire SPI interface, which saves GPIO pins and increases communication speed.

Some of you might wonder: since the screen is circular, which point is the first pixel? How do we determine the coordinates?
Actually, you can think of it as a square screen with an inscribed circle inside. We only display content within this inscribed circle, and pixels outside the circle are discarded. Most circular LCDs on the market work this way.

Communication Protocol

Note: The difference from the traditional SPI protocol is that the data line sent from the slave to the host is hidden because it only needs to be displayed.
RESX is the reset pin, it is pulled low when the module is powered on, usually set to 1;
CSX is the slave chip select pin, and the chip is enabled only when CS is low;
D/CX is the data/command control pin of the chip, when DC = 0 a command is written; when DC = 1, data is written
SDA is the data transmitted data, that is, RGB data;
SCL is the SPI communication clock pin.
For SPI communication, the data transmission has timing sequences involving clock phase (CPHA) and clock polarity (CPOL):
CPHA determines whether data is captured on the first or second clock edge. When CPHA = 0, data is captured on the first clock edge.
CPOL determines the idle level of the clock; CPOL = 0 means low.
From the diagram, it can be seen that when SCLK falls on the first edge, data transmission starts. One clock cycle transmits 8 bits, using SPI0, bitwise transmission, high bit first, and low bit last.

For more details, refer to: GC9D01 Datasheet

Dimensions

Working with ESP32-C3

Components Preparation

• ESP32-C3-Zero x1
• 0.71inch LCD Module x1

Hardware Connection

Connect to ESP32-C3-Zero

• 8PIN connector

LCD Pin	ESP32C3
VCC	5V
GND	GND
DIN	GPIO7
CLK	GPIO6
CS	GPIO5
DC	GPIO4
RST	GPIO8
BL	3V3

Environment Setup

Download and install Arduino IDE

• Click to visit the official website, select the corresponding system and system bit to download
  
• Run the installer and install all by default

Install ESP32 development board

• To use ESP32 boards in Arduino IDE, first install the ESP32 Development Board
  It is recommended to download and install ESP32_Arduino offline package (2.0.12 version recommended), and refer to Arduino board manager tutorial for the installation tutorial

Install libraries

• The necessary library files for this product are located in the Demo folder: 0.71inch-LCD-Module-Demo\ESP32-C3\libraries\, with library instructions detailed below
  

Library Name	Description	Library Installation Requirements
TFT_eSPI	LCD driver library	"Install Offline”
LVGL	LVGL library	"Install Offline”

• For library offline installation tutorial, please refer to Arduino library manager tutorial

Demos

• Download the Demo and unzip it
• Open the demos located at 0.71inch-LCD-Module-Demo\ESP32-C3\examples

• ESP32-C3 demos

Demo	Description	Dependency Library
1.Text_and_Number_Display	Text and nymber display	TFT_eSPI
2.Shapes_on_Circular_Display	Drawing	TFT_eSPI
3.Animated_Eye1	Simulated eye style1	TFT_eSPI
4.Animated_Eye2	Simulated eye style2	TFT_eSPI
5.Animated_Eye12	Simulated eye styles1 and 2, displayed alternately	TFT_eSPI
6.Image_Display	Display image	TFT_eSPI and LVGL
7.Clock	Clock	TFT_eSPI and LVGL

• Arduino project configuration:
  

Resources

Documents

• 0.71inch LCD Module Schematic diagram
• GC9D01 Datasheet

Demo

• Demo

FAQ

Support

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