Product Subtitle / Keywords:
1.9 Inch Display, 170(RGB)×320 Resolution, Transmissive a-Si TFT IPS, 4-Line Serial Interface, COG+FPC+B/L, 262K Colors, 49.72×25.80×2.10 mm, 400 cd/m² Brightness, 80mA Backlight, 25,000 Hrs LED Life, Free (IPS) Viewing Direction, -20°C~70°C Operating Temperature

1. Executive Summary & Product Positioning

The LS019I02-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 1.9-inch transmissive color active matrix TFT-LCD module using amorphous silicon TFT as a switching device.

This product specification (Revision 1.0, Module Type: COG+FPC+B/L) serves as the definitive technical document, defining its structural composition, physical features, mechanical dimensions, absolute maximum ratings, detailed electrical characteristics, complete 4-Line Serial Interface pinout and timing, and comprehensive electro-optical performance. It delivers a resolution of 170(RGB)×320 with 262K-color display capability.

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 color active matrix TFT-LCD using amorphous silicon TFT as a switching device.
• Display Mode: Active matrix TFT, Transmissive type.
• Display Format: Graphic 170(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 IC, an FPC, and a backlight unit.
• Input Data: 4-line serial interface.
• Viewing Direction (Grayscale Inversion): ALL (IPS).
• Drive IC: ST7789V (as per outline dimension notes).
• 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: TFT, IPS, Transmissive.
2. Resolution: 170 RGB * 320.
3. Viewing Direction: ALL (IPS).
4. Polarizer: Upper sand 0.15MM / Lower light 0.15MM.
5. Module Luminance (WITHOUT CTP): 350 CD/M2 (MIN), 400 CD/M2 (TYP).
6. Subjective Hue or Color Temperature: X=0.29±0.03; Y=0.30±0.03.
7. Operating Temperature: -20℃ ~ +70℃.
8. Storage Temperature: -30℃ ~ +80℃.
9. Backlight Circuit: VF=3.0V, IF=80mA.
10. General Tolerance: ±0.20 mm (unmarked).
11. FPC Total Thickness: FPC+PI=0.3±0.03mm.
12. FPC Bend: The FPC is shipped in a specific bent configuration (展开出货).
13. **ROHS Compliance with RoHS.

3.2 Electrical & Interface Specifications

3.2.1 Absolute Maximum Ratings

Critical Notes:

• Permanent damage to the device may occur if maximum values are exceeded or reverse voltage is loaded.
• Functional operation should be restricted to the conditions described under normal operating conditions.
• In case of below 0°C, the response time of liquid crystal (LC) becomes slower and the color of panel becomes darker than normal one.
• If product is exposed to high temperatures for extended time, there is a possibility of the polarizer film damage which could degrade the optical characteristics.

3.2.2 Electrical Characteristics (DC – Recommended Operating Conditions)

3.2.3 Pin Description (12-pin FPC)

Interface Summary:

• 4-Line Serial Interface: Uses SCL (Serial Clock), SDA (Serial Data), D/C (Data/Command), CS (Chip Select), and RESET (Reset) for communication.
• Backlight: Dedicated A (Anode, Pin 3) and K (Cathode, Pin 2) pins.
• Power: VDD (Pin 4) for interface logic, GND (Pins 1, 5, 6, 12) for ground.

3.2.4 Serial Interface Timing Characteristics

Conditions: VDDI=1.65 to 3.3V, VDD=2.4 to 3.3V, AGND=DGND=0V, Ta=-30 to 70 °C.

A. Write Operation Timing:

B. Read Operation Timing:

Key Timing Observations:

• Write timing is faster than read timing: Write clock cycle (TSCYCW) isCYCW) is 66ns (15.15 MHz).
• Output disable time: TOH = 15ns to 50ns for maximum CL=30pF.

3.2.5 Backlight Unit

Backlight System: Edge-lighting type with 4 white LEDs.

3.3 Optical & Electro-Optical Characteristics

Definition of Contrast Ratio (CR):
Contrast Ratio (CR) = Luminance measured when LCD on the "white" state / Luminance measured when LCD on the "black" state

Measurement Setup:

• Photo-detector (BM-5A) at 50cm distance from center of panel, Field=1°.
• After stabilizing and leaving the panel alone at a given temperature for 30min, the measurement should be executed.
• Measurement should be executed in a stable, windless, and dark room 30min after lighting the back-light.

3.4 Reliability Test Conditions

Remarks:

• The test samples should be applied to only one test item.
• Sample size for each test item is 5~10pcs.
• For High Temperature/Humidity storage test, pure water (resistance>10MΩ) should be used.
• In case of malfunction defect caused by ESD damage, if it would be recovered to normal state after resetting, it would be judge as a good part.
• Failure judgment criterion: basic specification, basic specification, electrical characteristic, mechanical characteristic, optical characteristic.

4. Application Guidelines & Critical Notes

Intended Use

• Compact IoT devices and smart home controls
• Wearable devices and miniature instruments
• Applications requiring a long, narrow display format (170x320)
• Any application requiring a compact IPS display with excellent viewing angles

Critical Design Considerations

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

2. Power Supply:

   • Provide stable VDD (2.8V-3.2V) for the interface logic circuits.
   • Provide stable IOVCC (1.65V to 3.3V, 1.8V typical) for the I/O interface.
   • The backlight requires a constant-current LED driver set to 80 mA at approximately 3.0V.

3. Interface Timing Requirements:

   • For write operations, the serial clock cycle (TSCYCW) must be ≥ 66ns (15.15 MHz maximum).
   • Chip select setup time (TCS): 15ns for write, 60ns for read.
   • Chip select hold time (TCSH): 15ns for write, 65ns read**.

4. Mechanical Integration:

   • Module Outline: 49.72mm (H) × 25.80mm (V) × 2.10mm (D).
   • Active Area: 42.00mm × 22.70mm.
   • FPC: The module uses a 12-pin FPC.
   • FPC Total Thickness: FPC+PI=0.3±0.03mm.
   • Enclosure Design: The document provides specific recommendations for enclosure window openings relative to the LCD AA (Active Area):
     • CTP V.A window: 0.3mm larger than LCD AA per side.
     • Housing lens window: 0.3mm larger than LCD AA per side.
     • Housing foam window: 0.6mm larger than LCD AA per side.
     • Housing shell window: 0.9mm larger than LCD AA per side.

5. Viewing Angle Characteristics:
   This is an IPS panel with a viewing direction of ALL, providing consistent image quality from all angles.

6. Optical Performance:

   • Module Luminance (WITHOUT CTP): 350 cd/m² (Min), 400 cd/m² (Typ).
   • Subjective Hue or Color Temperature: X=0.29±0.03; Y=0.30±0.03.

7. Temperature Limits:

   • Operating Temperature: -20°C to +70°C.
   • Storage Temperature: -30°C to +80°C.

Handling & Compliance

• The module is ROHS compliant.
• Observe standard ESD precautions during handling and assembly.
• The module contains fragile glass and a 12-pin FPC – handle with care.
• Avoid bending the FPC sharply, especially near the connector interface.
• The module has a total thickness of 2.10mm – be careful when handling to avoid flexing.

5. Conclusion & Design-In Support

The LS019I02-S-V1 specification details a compact 1.9-inch IPS display module with a 4-line serial interface — an excellent choice for applications requiring a long, narrow display format with excellent image quality and wide viewing angles.

Key Strengths:

1. Unique Aspect Ratio: The 170×320 resolution in a 1.9-inch format provides a long, narrow display area, ideal for specific UI layouts.

2. Excellent IPS Technology: ALL viewing direction ensures consistent image quality from any perspective.

3. High Brightness: 400 cd/m² (Typ) ensures good readability in indoor and outdoor conditions.

4. Long LED Life: Life: 25,000 hours (Typ) LED backlight life ensures long-term reliability.

5. Comprehensive Reliability Testing: The module has been tested under high/low temperature storage, high/low temperature operating, temperature cycling, and high temperature/humidity storage conditions.

Main Design Focus:

• The critical design task is properly implementing the serial interface timing with the 66ns write cycle requirement.
• Supporting requirements:
  • Provide stable VDD (2.8V-3.2V) and IOVCC (1.65V to 3.3V) power.
  • Provide a constant-current backlight driver set to 80 mA at 3.0V.
  • Mechanical integration — the module outline is 49.72mm × 25.80mm × 2.10mm.
  • FPC connector — verify the 12-pin FPC.
  • Enclosure design — follow the recommended window opening dimensions relative to the LCD AA.

This module is an excellent choice for designs requiring a compact, high-brightness IPS display with a unique aspect ratio, such as smart home controllers, IoT devices, and miniature instruments.