Gesight 1.2 inch Round AMOLED Display Instruction Manual

1. Introduction

This manual provides essential information for the Gesight 1.2-inch round/circular AMOLED display module, model PO120F390MS. This display is designed for integration into various applications, particularly smartwatches and other wearable devices, offering high-resolution, full-color visuals with advanced OLED technology.

1.1. Product Overview

The PO120F390MS is an AUO-produced 1.2-inch round AMOLED display featuring a 390x390 resolution. It utilizes the RM67162 driver IC from Raydium and supports both SPI and MIPI interfaces. Its compact design and superior visual characteristics make it ideal for demanding display applications.

Figure 1: Front view of the 1.2-inch round AMOLED display module

Figure 2: Back view of the 1.2-inch round AMOLED display module

1.2. AMOLED Technology Advantages

Compared to traditional LCDs, AMOLED displays offer several key advantages:

• Thin and Lightweight: More than 50% thinner and lighter than LCDs, enabling sleek form factors.
• Energy Efficient: Features like clock-mode standby can extend battery life significantly, with much lower power consumption.
• Superior Visuals: High contrast ratio and wide color gamut deliver sharp, vivid images and consistent display quality from any viewing angle.
• Sunlight Readability: Enhanced visibility in bright outdoor conditions.

Figure 3: OLED vs. LCD readability under sunlight

Figure 4: Wide operating temperature range for OLED displays

1.3. OLED Driver Technology

OLED drivers are categorized into Passive Matrix (PMOLED) and Active Matrix (AMOLED). PMOLEDs have a simpler structure but are limited in high-resolution, large-screen applications due to numerous control lines. AMOLEDs, by contrast, use a drive circuit to control light-emitting anodes, significantly reducing control lines and offering low power consumption, high resolution, and fast response times, making them the mainstream OLED display technology.

For high-resolution AMOLEDs, the driving circuit size is minimized, requiring sophisticated electrical performance. Low-Temperature Polysilicon (LTPS) technology addresses this by using excimer laser annealing to convert amorphous silicon into polysilicon, resulting in higher carrier mobility and lower defect density, thus enabling better electrical properties in small devices.

Figure 5: OLED Passive Matrix vs. Active Matrix structures

2. Setup and Integration

Integrating the PO120F390MS display requires careful attention to its electrical and mechanical specifications. This display is intended for use by manufacturers and electronics developers.

2.1. Mechanical and Electrical Connection

Refer to the detailed mechanical drawing for precise dimensions and pinout information. This is crucial for designing the host PCB and enclosure.

Figure 6: Detailed mechanical drawing and pinout

The display supports SPI and MIPI interfaces. Ensure your microcontroller or driving circuit is configured to communicate using the correct protocol and pin assignments as specified in the datasheet.

2.2. Software Initialization

To operate the display, specific initialization code is required to configure the driver IC (RM67162). This code typically sets up display parameters such as resolution, color depth, and refresh rate. Contact Gesight for the full specification, including the IC datasheet and initial code, after placing an order.

2.3. Testing the Display

Before final integration, it is recommended to test the display functionality. Gesight offers demo kits and H-DMI convert boards to facilitate testing and development.

3. Operating Principles

The PO120F390MS operates as an active-matrix organic light-emitting diode (AMOLED) display. Each pixel emits its own light, allowing for true blacks and vibrant colors. The display receives data via SPI or MIPI interface from a host controller, which manages the image rendering and display refresh cycles.

The display is designed for continuous operation within its specified temperature and voltage ranges. Its high contrast ratio and wide viewing angles ensure optimal performance in various user scenarios, particularly for wearable devices where viewing conditions can vary.

4. Maintenance and Care

To ensure the longevity and optimal performance of your AMOLED display, follow these guidelines:

• Handle with Care: Displays are delicate electronic components. Avoid applying excessive force, bending, or dropping the module.
• Prevent Static Discharge: Always use anti-static precautions when handling the display to prevent damage to sensitive electronic components.
• Environmental Conditions: Operate and store the display within the specified temperature and humidity ranges to prevent degradation. Avoid exposure to direct sunlight for prolonged periods when not in use.
• Cleaning: If necessary, gently clean the display surface with a soft, lint-free cloth. Avoid using harsh chemicals or abrasive materials.
• Quality Assurance: Gesight implements strict quality control measures to ensure displays are free from defects like bright or dark dots.

Figure 7: Display undergoing quality control testing

Figure 8: Commitment to displays free from bright or dark dots

5. Troubleshooting

If you encounter issues with your display module, consider the following troubleshooting steps:

• No Display/Blank Screen:
  • Verify all electrical connections (power, ground, data lines) are secure and correctly wired according to the datasheet.
  • Check the power supply voltage to ensure it is within the specified range (1.8/3.3/3.3V Typical).
  • Confirm that the initialization code is correctly uploaded and executed by your host controller.
• Incorrect/Garbled Display:
  • Ensure the data interface (SPI/MIPI) settings (clock speed, data format) match the display's requirements.
  • Review your display initialization code for any errors in register settings or timing.
• Physical Damage or Wrong Part Received:
  • If a part is damaged upon receipt, contact Gesight immediately for assistance. Replacements are typically processed within 1-3 working days.
  • If you received the wrong part, carefully re-read the product description to confirm the correct item. Contact Gesight for assistance in replacing it with the correct one.
• Testing Performance:
  • For comprehensive testing of display quality and performance, consider using Gesight's demo kits or H-DMI convert boards.

Figure 9: Common questions and support information

6. Specifications

The following table details the technical specifications for the Gesight 1.2-inch Round AMOLED Display (Model: PO120F390MS):

7. Warranty and Support

Gesight is committed to providing high-quality display products and support. For any technical inquiries, detailed specifications (datasheets, IC datasheets, initial code), or assistance with product issues, please contact Gesight directly.

• Technical Documentation: Full specifications, including display datasheets, IC datasheets, and initial code, are available upon request after order confirmation.
• Customer Service: Inquiries are typically responded to within 24 hours.
• Component Support: For bulk orders (3+ pieces), free convertor boards and connectors may be provided.

Figure 10: Contact Gesight for detailed specifications

8. User Tips

• Verify Compatibility: Before integrating, always verify that the display's specifications (size, resolution, interface) are compatible with your target device or project, such as specific smartwatch models (e.g., GTR 4 new).
• Utilize Development Tools: For easier testing and development, consider acquiring Gesight's demo kits or H-DMI convert boards. These can significantly streamline the integration process.
• Careful Handling: As a sensitive electronic component, always handle the display with care, using anti-static measures to prevent damage.
• Consult Documentation: Always refer to the official datasheets and initial code provided by Gesight for accurate electrical connections and software implementation.