Product Subtitle / Keywords:
3.2 Inch Display, 240(RGB)×320 Resolution, Transmissive a-Si TFT-LCD, RGB Interface, COG+FPC+B/L, 262K Colors, ST7789T3 Driver, 55.04×77.50×2.84 mm, 350 cd/m² Luminance, 1200:1 Contrast Ratio, 30ms Response Time, ALL Viewing Direction, -20°C~70°C Operating Temperature

1. Executive Summary & Product Positioning

The LS032I01-R-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 3.2-inch transmissive color active matrix TFT (Thin Film Transistor) liquid crystal display (LCD) that uses 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 (COG+FPC+B/L), physical features, mechanical dimensions, absolute maximum ratings, detailed electrical characteristics, complete RGB 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 ST7789T3 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 color active matrix TFT (Thin Film Transistor) liquid crystal display (LCD) that uses amorphous silicon TFT as a switching device.
• Display Mode: Active matrix TFT-LCD module (TFT-LCD panel, driver IC and FPC), a back-light unit.
• 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 module (TFT-LCD panel, driver IC and FPC), a back-light unit.
• Input Data: RGB.
• Viewing Direction (Grayscale Inversion): ALL.
• Drive IC: ST7789T3.
• 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 LCD.
2. Resolution: 240RGB*320.
3. Viewing Direction: ALL o'clock.
4. Operating Temperature: -20°C ~ 70°C.
5. Storage Temperature: -30°C ~ 80°C.
6. Backlight: 5 White LED.
7. General Tolerance: ±0.20 mm.
8. Angular Tolerance: ∠ ±1/4°.
9. Enclosure Design Notes:
   • It is recommended that the CTP V.A opening window be 0.3mm larger per side than the LCD AA.
   • It is recommended that the housing lens opening window be 0.3mm larger per side than the LCD AA.
   • It is recommended that the CTP foam opening window be 0.7mm larger per side than the LCD AA.
   • It is recommended that the housing foam opening window be 0.9mm larger per side than the LCD AA.
   • It is recommended that the housing shell material opening window be 0.6mm larger per side than the LCD AA.
10. FPC Total Thickness: PI补强+FPC总厚=0.3±0.03mm.
11. Backlight Thickness: BL 2.84±0.2mm.
12. Polarizer Thickness: POL 0.15mm.
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. Backlight Circuit: IF=100mA, Vf=3.0V.

3.2 Electrical & Interface Specifications

3.2.1 Absolute Maximum Ratings

(Ta=25±2°C, Vss=GND=0V)

Notes (from document):
(1) 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. Level of retardation depends on temperature, because of the LC characteristics.
(2) 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) 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.

3.2.2 Electrical Characteristics (DC – Recommended Operating Conditions)

(Ta=25±2°C)

3.2.3 Backlight Unit Characteristics

The back-light system is an edge-lighting type with 5 white LEDs.

(Ta=25±2°C)

Note:
(1) The “LED life time” is defined as the module brightness decrease to 50% of original brightness at $I_L=100mA$. The LED life time could be decreased if operating $I_L$ is larger than 100mA.

Backlight Circuit Diagram (from document):

A → [Backlight Circuit] → K
IF = 100mA
VF = 3.0V

3.2.4 Pin Description (Selected Pins from Chapter 6)

The module uses a multi-pin interface. A selected list of relevant pins is provided below:

Interface Summary:

• RGB Interface: Uses PCLK (Pixel Clock), HS (Horizontal Sync), VS (Vertical Sync), DE (Data Enable), and R0-R5, G0-G5, B0-B5 (18-bit data bus) for high-speed parallel data transmission.
• Serial Interface (SPI): The module also includes SCL (Serial Clock) and SDA (Serial Data) pins, typically used for command/register configuration.
• Control Pins: RESET (Reset), CS (Chip Select).
• Backlight: Dedicated LEDA (Anode, Pins 3, 4) and LEDK (Cathode, Pins 1, 2) pins.
• Power: VCC (Pins 41, 42) for main logic, GND (Pins 53, 54) for ground.

3.2.5 RGB Interface Timing Characteristics

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

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

Notes (from document):

Note (2) Definition of Contrast Ratio (CR):
$$\text{ Contrast Ratio(CR)}=\frac{\text{ Luminance measured when LCD on the"white" state}}{\text{ Luminance measured when LCD on the"black" state}}$$

Note (3) Definition of Luminance Uniformity:
Active area is divided into 9 measuring areas (Shown in below), every measuring point is placed at the center of each measuring area.
$$\text{ Luminance Uniformity}=\frac{\text{ Min Luminance of white among 9-points}}{\text{ Max Luminance of white among 9-points}}\times 100\%$$

Note (4) Definition of Response time:
Sum of Tr and Tf.

Note (5) Definition of Viewing Angle:
The viewing angle range that the CR≥10.

Note (6) Definition of Color Chromaticity (CIE 1931):
Color coordinate of white & red, green, blue at center point.

Note (7): The different Rubbing Direction will cause the different optima view direction.

3.4 Reliability Test Conditions

3.5 Version Record

(Not explicitly provided in the extracted document excerpt; refer to the REVISION HISTORY section of the full specification.)

4. Application Guidelines & Critical Notes

Intended Use

• Industrial control panels and human-machine interfaces (HMIs)
• IoT display nodes and smart home controls
• Handheld instruments and consumer electronics
• Any application requiring a compact, high-brightness display with excellent viewing angles

Critical Design Considerations

1. Interface (RGB): This module uses a parallel RGB interface for high-speed data transmission. The host MCU must have an RGB LCD controller with at least 20+ GPIOs (PCLK, HS, VS, DE, 18 data lines) to drive the display.

2. Power Supply:

   • Provide stable VCI (2.4V to 3.3V, 2.75V typical) for the main logic (connected to Pins 41, 42).
   • Provide stable IOVCC (1.65V to 3.3V, 1.8V typical) for the I/O interface.
   • The backlight requires a constant-current LED driver connected to LEDA (Anode, Pins 3, 4) and LEDK (Cathode, Pins 1, 2), set to 100 mA at approximately 3.0V (Typ).

3. Mechanical Integration:

   • Module Outline: 55.04mm (H) × 77.50mm (V) × 2.84mm (D).
   • Active Area: 48.60mm × 64.80mm.
   • FPC: The module uses a multi-pin FPC.
   • Enclosure Design: The document provides specific recommendations for enclosure window openings relative to the LCD AA (Active Area):
     • CTP V.A opening window: 0.3mm larger per side than LCD AA.
     • Housing lens opening window: 0.3mm larger per side than LCD AA.
     • CTP foam opening window: 0.7mm larger per side than LCD AA.
     • Housing foam opening window: 0.9mm larger per side than LCD AA.
     • Housing shell material opening window: 0.6mm larger per side than LCD AA.

4. Viewing Angle Characteristics:
   This module provides ALL viewing direction:

   • Top (12 o'clock): 80° (Typ)
   • Bottom (6 o'clock): 80° (Typ)
   • Left (9 o'clock): 80° (Typ)
   • Right (3 o'clock): 80° (Typ)

5. Optical Performance:

   • Luminance: 350 cd/m² (Typ) – high brightness for good readability.
   • Contrast Ratio: 1200 (Typ) – excellent contrast performance.
   • Response Time: 30ms (Typ), 35ms (Max).
   • LED Life Time: 20,000 Hrs (Min), 25,000 Hrs (Typ).
   • Color Chromaticity (CIE 1931): Detailed specifications for White, Green, and Blue are provided in the optical characteristics table.

6. Temperature Limits:

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

Handling & Compliance

• Observe standard ESD precautions during handling and assembly.
• The module contains fragile glass and an FPC – handle with care.
• Avoid bending the FPC sharply, especially near the connector interface.
• The module has a total thickness of 2.84mm – 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 LS032I01-R-V1 specification details a high-performance 3.2-inch display module with an RGB interface and ST7789T3 driver — an excellent choice for applications requiring a larger display area with excellent image quality and wide viewing angles.

Key Strengths:

1. High Brightness: 350 cd/m² (Typ) ensures good readability in indoor and outdoor conditions.

2. Excellent Contrast Ratio: 1200:1 (Typ) provides outstanding image quality.

3. Wide Viewing Angles: 80° in all directions ensures consistent image quality from any perspective.

4. High-Speed RGB Interface: The 18-bit parallel RGB interface provides high bandwidth for smooth video and animation playback.

5. Long LED Life Time: 25,000 Hrs (Typ) ensures long-term reliability.

6. Wide Operating Temperature Range: -20°C to +70°C for operation and -30°C to +80°C for storage.

Main Design Focus:

• The critical design task is properly implementing the RGB interface timing to ensure reliable high-speed data transfer.
• Supporting requirements:
  • Provide stable VCI (2.75V typical) and IOVCC (1.8V typical) power.
  • Provide a constant-current backlight driver set to 100 mA at 3.0V (Typ).
  • Mechanical integration — the module outline is 55.04mm × 77.50mm × 2.84mm.
  • FPC connector — verify the multi-pin FPC.

This module is an excellent choice for industrial control panels, smart home devices, and any embedded application requiring a larger, high-brightness display with excellent image quality and wide viewing angles.