LCD Application Solution

[中文]

Introduction to LCD Solutions

Espressif’s HMI Smart Screen (LCD) solution features outstanding performance and scalability, and can be paired with different ESP main control chips. This solution performs well in various application scenarios such as smart home control, household appliance screens, medical equipment, industrial control, and children’s education. Advantages include high-performance graphic visualization, low memory usage, and a comprehensive screen adaptation solution that supports high-performance JPEG decoding and frame rate optimization. Below is a detailed introduction to the LCD solution

  • Outstanding Graphic Visualization: Leveraging the high-performance graphic processing capabilities of ESP chips and deep collaboration with the LVGL official, it excels in LVGL compatibility. This solution offers exquisite visual effects, low memory usage, and can be easily integrated into product designs.

  • Simple UI Design: The UI editor Squareline Studio supports quick and easy design and development of UI for embedded devices. It is easy to port and allows UI implementation without code, minimizing development time.

  • Rich Software and Hardware References: Provides comprehensive LCD software and hardware development materials, including detailed guides and examples. In addition, HMI development boards designed for various HMI application scenarios can help developers get started quickly.

  • Comprehensive Screen Adaptation: Supports various operation methods, including touch, knobs, etc. It also supports various peripheral interfaces such as RGB, SPI, etc. Multiple LCD driver ICs and Touch driver ICs have been adapted and organized into components to meet the needs of different user groups.

Furthermore, Espressif also supports the following features to further ensure a smoother interactive experience in LCD application scenarios:

  • Frame Rate Optimization and Tear Prevention Technology: Ensures smooth and consistent image display through carefully optimized frame rate control and tear prevention technology.

  • High-Performance JPEG Decoding: Supports efficient image processing to ensure a smooth multimedia experience.

  • Voice Wake-up and Recognition: Integration of advanced voice recognition technology provides users with a more convenient way of interaction.

The following is an overview of a flowchart scheme:

Scheme Architecture Diagram

Common Applications of LCDs:

Espressif’s LCD solutions are widely used in various fields, including but not limited to:

  • Rotary Knob Screen Solution: Targeted at smart home appliance products, it is the preferred upgrade for traditional segment code screens and black-and-white screens. It supports Wi-Fi, Bluetooth, and expansion interfaces for functions such as serial communication. A typical application scenario is the rotary knob screen in small home appliance applications.

Rotary Knob Screen Example

  • Central Control Screen Solution: Integrates Wi-Fi, BLE, offline voice, RGB LCD display, supports offline command words, and continuous voice recognition. Suitable for the upgrade and iteration of traditional 86 panels, it constructs a smart home control center that integrates device control, switch panels, temperature control panels, smart remote controls, etc.

Central Control Screen Example

Visual Voice Solution: Utilizes native USB to connect to a universal USB camera, achieving camera data stream reading, JPEG decoding, and real-time display on an RGB interface screen on a single SoC, without the need for additional USB chips. Suitable for scenarios such as cat’s eyes, smart doorbell locks, electronic endoscopes, etc.

Visual Speech Solution

High-Performance Multimedia Solution: This solution uses the ESP32-P4 chip, supporting MIPI-CSI and MIPI-DSI interfaces, suitable for various scenarios requiring high-resolution cameras and displays. The chip also integrates hardware accelerators for various media encoding and compression protocols, hardware pixel processing accelerator (PPA), and 2D-DMA, making it suitable for a wide range of multimedia applications.

High-Performance Multimedia Example

In summary:

Overview of LCD Solutions

Solution Category

Solution Name

Main Control

Screen

Features

Application Scenarios

Rotary Screen

2.1-inch Rotary Screen Solution (Qiming)

ESP32-S3

2.1-inch, 480 x 480 RGB interface screen

Supports Wi-Fi, Bluetooth, and expandable interfaces for serial communication, buttons, USB cameras, and other functions

Ideal for smart home appliances, preferred upgrade for traditional segment displays and black-and-white screens

Rotary Screen

1.28-inch Rotary Screen Solution

ESP32-C3

1.28-inch, 240 x 240 SPI interface screen

Rotary encoder with push-button switch, compact design

Application scenarios include rotary screens and small-sized displays in small home appliances

Central Control Screen

Smart Voice Touch Panel (86 Box) Solution

ESP32-S3

3.95-inch, 480 x 480 RGB interface screen

Integrated with Wi-Fi, BLE, offline voice recognition, RGB LCD display, supports offline command words and continuous voice recognition

Upgraded iteration for traditional 86 panels, serving as the central hub for smart home control integrating device control, switch panels, temperature control panels, and smart remote controls

Central Control Screen

Smart Central Control Switch Solution

ESP32-S3

7-inch, 800 x 480 RGB interface screen

Multi-touch screen for gesture recognition, supports Wi-Fi CSI human body proximity sensing, used for building home visual panels

Quick switch control in smart homes, such as scene mode switching and light control

Visual Voice Solution

Visual Voice Solution

ESP32-S3

4.3-inch, 800 x 480 RGB interface screen

Utilizes native USB for connecting to a generic USB camera, achieving camera data stream reading, JPEG decoding, and real-time display on an RGB interface screen on a single SoC without the need for additional USB chips. Local video decoding and screen refresh resolution can reach 800 x 480 @15 FPS

Applications include cat’s eye cameras, smart doorbells, smart door locks, electronic endoscopes, and more.

High-Performance Multimedia Solution

High-Performance Multimedia Solution

ESP32-P4

8-inch, 800 x 1280 MIPI-DSI interface screen

Supporting MIPI-CSI and MIPI-DSI interfaces, it is suitable for various scenarios requiring high-resolution cameras and displays. It incorporates hardware accelerators for multiple media encoding and compression protocols, a hardware pixel processing accelerator (PPA), and 2D-DMA, making it ideal for diverse multimedia applications.

Designed for high-performance multimedia applications

LCD Reference Solutions

ESP-BOX

Description:

A home appliance control platform developed for voice assistants, touchscreen controllers, sensors, infrared controllers, and smart Wi-Fi gateways.

Hardware:
Related Links:
Features:

  • Based on LVGL GUI framework

  • Dual-microphone far-field voice interaction, offline AI recognition in Chinese and English, supports over 200 voice commands

  • Integrated end-to-end AIoT development framework ESP-RainMaker

  • Pmod™ compatible connector supports peripheral modules for expanding sensors, infrared controllers, etc.

  • PSRAM requirement: 8-bit (8M)

ESP32-C3 Rotary Screen

Description:

Circular rotary screen solution, integrating common scenarios such as washing machines, dimmers, and thermostats.

Hardware:
Related Links:
Features:

  • Based on LVGL GUI framework

  • Circular screen UI display (non-touch), controlled by a rotary encoder

Intelligent Voice Touch Panel (86 Box)

Description:

Can be used for the upgrade iteration of traditional 86 panels, building an intelligent home control center integrating device control, switch panel, temperature control panel, smart remote control, etc.

Hardware:
Related Links:
Features:

  • Based on LVGL GUI framework

  • Dual microphone far-field voice interaction, Chinese and English AI offline voice recognition, supports over 200 voice commands

  • PSRAM requires 8 lines (R8) and enables 120M

Electronic Visual Doorbell

Description:

Utilizes native USB interface to connect with a generic USB camera, achieving camera data stream reading, JPEG decoding, and real-time display on an RGB interface screen on a single SoC without the need for additional USB chips. The local video decoding and screen refresh resolution can reach 800x480@15 FPS.

Hardware:
Related Links:
Features:

  • USB camera data stream reading, requires support for Bulk mode

  • JPEG decoding

  • 800x480 RGB LCD display

  • PSRAM requires 8 lines (R8) and enables 120M

Smart Central Control Switch

Description:

Recognizes gestures such as double-finger tapping and patting through a multi-touch screen, which can be used for quick switch control in smart homes, such as scene mode switching and light control. Combined with Wi-Fi CSI human body proximity sensing function, it can also achieve automatic on-off control of screen proximity wake-up and screen-off.

Hardware:
Related Links:
Features:

  • 7-inch large LCD screen, supports multi-touch

  • Wi-Fi CSI human body proximity sensing

  • PSRAM requires 8 lines (R8) and enables 120M

High-Performance Multimedia Solution

Description:

Supporting MIPI-CSI and MIPI-DSI interfaces, it is suitable for various scenarios requiring high-resolution cameras and displays, with hardware accelerators for multiple media encoding and compression protocols, a hardware pixel processing accelerator (PPA), and 2D-DMA, making it suitable for a wide range of multimedia applications.

Hardware:

  • Development Board: ESP32-P4_Function_EV_Board

  • Screen: 8-inch 800 x 1280 LCD screen (IC: ILI9881C)

Related Links:
Features:

  • Supports MIPI-DSI and MIPI-CSI interfaces

  • Hardware accelerators for various media encoding and compression protocols

  • Hardware pixel processing accelerator (PPA) and 2D-DMA

LCD Reference Materials

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