Product Subtitle / Keywords:
2.83 Inch Display, 240(RGB)×320 Resolution, Transmissive a-Si TFT IPS, 4-Line SPI Interface, COG+FPC+B/L, 262K Colors, 14-Pin, ST7789P3 Driver, 50.0×69.1×2.3 mm, 300 cd/m² Luminance, 1500:1 Contrast Ratio, 35ms Response Time, Free (IPS) Viewing Direction, -10°C~60°C Operating Temperature

1. Executive Summary & Product Positioning

The LS0283I01-S-V1, developed by Lixin (Wan'an) Intelligent Display Technology Co., Ltd. (立信(万安)智显科技有限公司), is a 2.83-inch transmissive amorphous Silicon TFT-LCD (a-Si TFT-LCD) module with IPS (In-Plane Switching) technology.

This product specification (Revision 1.0, Module Type: COG+FPC+B/L) serves as the definitive technical document, defining its structural composition (COG+FPC+B/L), physical features, mechanical dimensions, absolute maximum ratings, detailed electrical characteristics, complete 4-Line SPI (Serial Peripheral Interface) pinout and timing, and comprehensive electro-optical performance. It delivers a resolution of 240(RGB)×320 with 262K-color display capability, driven by the ST7789P3 controller.

The document provides the core parameters necessary for system integration into compact embedded display applications. The unequivocal recommendation for engineers is to strictly adhere to the electrical specifications, interface timing, and mechanical tolerances described herein to ensure reliable performance and compatibility.

2. Detailed Product Overview & Architecture

• Core Technology: Transmissive-type a-Si TFT-LCD (amorphous silicon thin film transistor liquid crystal display).
• Display Mode: Active matrix TFT, Transmissive type.
• Display Format: Graphic 240(RGB)×320 Dot-matrix.
• Display Characteristics: Capable of displaying up to 262 thousand colors.
• Module Construction: COG (Chip-On-Glass) + FPC (Flexible Printed Circuit) + B/L (Backlight Unit). Composed of a TFT-LCD panel, a driver circuit, and a backlight unit.
• Input Data: 4-line serial interface.
• Viewing Direction (Grayscale Inversion): Free (IPS) – wide viewing angle in all directions.
• Drive IC: ST7789P3.
• Connector Pin Count: 14-Pin.
• Approval Status: ☑ Approved Product Specification only (as per signature block).

3. Exhaustive Technical Specifications

3.1 Mechanical & Physical Specifications

Critical Mechanical Design Notes (from outline dimension drawing):

1. Display Type: Main LCD: Transmissive, IPS.
2. Viewing Direction: Free (IPS).
3. Operating Temperature: -10°C ~ 60°C.
4. Storage Temperature: -20°C ~ 70°C.
5. Backlight: 4 Chip-White LED Parallel.
6. ROHS Compliance: Yes.
7. General Tolerance: ±0.20 mm.
8. Angular Tolerance: ∠ ±1/4°.
9. Enclosure Design Notes:
   • It is recommended that the housing visible area be 0.3mm smaller per side than the VAmds.
   • The housing foam window should be 0.6mm larger per side than the VAmds.
   • The TP edge cannot contact metal conductors.
10. FPC Total Thickness: PI补强+FPC总厚=0.35mm.
11. Backlight Thickness: H-BL 0.74±0.2 mm.
12. Polarizer Thickness: POL 0.15 mm.
13. Silver Paste Points: Present on the module.
14. Yellow Insulation Paper: Included for handling during assembly.
15. Release Tape/Sticker: Included (易撕贴).
16. Alignment Mark: White alignment line (白色对位线).
17. Backlight Circuit: IF=80mA, Vf=3V(TYP).

3.2 Electrical & Interface Specifications

3.2.1 Absolute Maximum Ratings

Notes (interpreted):

• Note1/Note2: Stress beyond these ratings may cause permanent damage; functional operation is not implied under these conditions.

3.2.2 Electrical Characteristics (DC – Recommended Operating Conditions)

3.2.3 Pin Description (14-pin FPC)

Interface Summary:

• 4-Line Serial Interface: Uses SCL (Serial Clock), SDA (Serial Data), RS (Data/Command), CS (Chip Select), and RES (Reset) for communication.
• TE Pin (Pin 10): Tearing effect output — can be used for frame synchronization.
• Backlight: Dedicated A (Anode, Pin 13) and K (Cathode, Pin 12) pins.
• Power: VDD (Pin 1) for main logic, IOVCC (Pin 14) for I/O interface, GND (Pins 2, 5, 7, 9) for ground.

3.2.4 Serial Interface Timing Characteristics (4-line SPI)

Conditions: VDDI=1.65 to 3.3V, VDD=2.4 to 3.3V, AGND=DGND=0V, Ta=25°C.

Key Timing Observations:

• The serial interface timing parameters are marked as TBD (To Be Determined) in the extracted document. Please refer to the full specification for detailed timing values.

3.2.5 Backlight Unit

Backlight Circuit Diagram (from document):

A → [Backlight Circuit] → K
IF = 80mA
VF = 3V (TYP)

3.3 Optical & Electro-Optical Characteristics (Ta=25°C)

Notes (from document):

Note 1: Definition of Response Time
The response time is defined as the LCD optical switching time interval between "White" state and "Black" state. Rise time (Tr) is the time between photo detector output intensity changed from 10% to 90%. And fall time (Tf) is the time between photo detector out intensity changed from 90% to 10%.

Note 2: Definition of Contrast Ratio
Contrast ratio (CR) is defined mathematically by the following formula:
Contrast Ratio = Luminance measured when LCD on the "White" state / Luminance measured when LCD on the "Black" state

Note 3: Definition of Viewing Angle
Viewing angle is the angle at which the contrast ratio is greater than 10. Angles are determined for the horizontal or x axis and the vertical or y axis with respect to the z axis which is normal to the LCD surface.

Note 4: Backlight Circuit

• Drive condition: IF = 80mA, Vf = 3V (TYP)

3.4 Version Record

(Not explicitly provided in the extracted document excerpt; refer to Section 9 of the full specification.)

4. Application Guidelines & Critical Notes

Intended Use

• Smartwatches, fitness trackers, and other wearable devices
• IoT display nodes and smart home controls
• Miniature handheld instruments
• Any application requiring a compact display with excellent IPS viewing angles and high brightness

Critical Design Considerations

1. Interface (4-Line Serial SPI): This module uses a 4-line serial SPI interface for communication. The host MCU must have at least 5 GPIOs (SCL, SDA, RS, CS, RES) to drive the display.

2. Power Supply:

   • Provide stable VCC (2.4V to 3.3V, 2.75V typical) for the main logic (connected to Pin 1).
   • Provide stable IOVCC (1.65V to 3.3V, 1.8V typical) for the I/O interface (connected to Pin 14).
   • The backlight requires a constant-current LED driver connected to A (Anode, Pin 13) and K (Cathode, Pin 12), set to 80 mA at approximately 3V (TYP).

3. TE (Tearing Effect) Pin (Pin 10):

   • The TE pin outputs the display's tearing effect signal.
   • This signal can be used to synchronize MCU frame writes with the display's internal refresh cycle, preventing screen tearing.
   • If not used, leave this pin open.

4. Mechanical Integration:

   • Module Outline: 50.0mm (H) × 69.1mm (V) × 2.3mm (D).
   • Active Area: 43.6mm × 58.02mm.
   • FPC: The module uses a 14-pin FPC.
   • Enclosure Design: The document provides specific recommendations for enclosure window openings relative to the LCD AA (Active Area):
     • Housing visible area: 0.3mm smaller per side than VAmds.
     • Housing foam window: 0.6mm larger per side than VAmds.
     • TP edge cannot contact metal conductors.

5. Viewing Angle Characteristics:
   This is an IPS panel with excellent viewing angle performance (CR > 10):

   • Top (12 o'clock): 85° (Typ)
   • Bottom (6 o'clock): 85° (Typ)
   • Left (9 o'clock): 85° (Typ)
   • Right (3 o'clock): 85° (Typ)

   The module provides near-perfect viewing angles in all directions, making it ideal for wearable devices.

6. Optical Performance:

   • Response Time: 35ms (Max) – fast enough for most GUI applications.
   • Contrast Ratio: 1000 (Min), 1500 (Typ) – excellent contrast performance for an IPS panel.
   • Transmittance: 4.5% (Min), 4.8% (Typ).
   • White Chromaticity (CIE1931): Wx = 0.301, Wy = 0.320 (Typical).
   • Luminance (IF = 80mA): 300 cd/m² (Typ) – high brightness for good readability in various lighting conditions.

7. Temperature Limits:

   • Operating Temperature: -10°C to +60°C.
   • Storage Temperature: -20°C to +70°C.

Handling & Compliance

• The module is ROHS compliant.
• Observe standard ESD precautions during handling and assembly.
• The module contains fragile glass and a 14-pin FPC – handle with care.
• Avoid bending the FPC sharply, especially near the connector interface.
• The module has a total thickness of 2.3mm – be careful when handling to avoid flexing.
• The module includes a yellow insulation paper and release tape/sticker for handling during assembly.

5. Conclusion & Design-In Support

The LS0283I01-S-V1 specification details a high-performance 2.83-inch IPS display module with a 4-line SPI interface and ST7789P3 driver — an excellent choice for wearable and compact display applications requiring high brightness, excellent image quality, and wide viewing angles.

Key Strengths:

1. High Brightness: 300 cd/m² (Typ) ensures excellent readability in indoor and outdoor conditions.

2. Excellent IPS Technology: 85° viewing angles in all directions ensure consistent image quality from any perspective — essential for wearable devices.

3. Excellent Contrast Ratio: 1500:1 (Typ) provides outstanding image quality for an IPS panel.

4. Standard 4-Line SPI Interface: Requires only 5 GPIOs for communication, simplifying integration.

5. Standard 14-pin FPC: The 14-pin FPC provides a robust connection interface.

6. TE (Tearing Effect) Support: The dedicated TE pin enables tear-free graphics synchronization.

7. High Transmittance: 4.8% (Typ) allows for efficient backlight usage.

Main Design Focus:

• The critical design task is properly implementing the serial interface timing to ensure reliable communication.
• Supporting requirements:
  • Provide stable VCC (2.75V typical) and IOVCC (1.8V typical) power.
  • Provide a constant-current backlight driver set to 80 mA at 3V (TYP).
  • Mechanical integration — the module outline is 50.0mm × 69.1mm × 2.3mm.
  • FPC connector — verify the 14-pin FPC.
  • Enclosure design — follow the recommended window opening dimensions relative to the LCD AA.

This module is an excellent choice for high-end wearable devices, smartwatches, and any compact IoT application requiring a high-brightness IPS display with excellent viewing angles and standard interface.