Product Subtitle / Keywords:
2.4 Inch Display, 240(RGB)×320 Resolution, Transmissive a-Si TFT-LCD, SPI Interface, COG+FPC+B/L, 262K Colors, 262K Colors, 18-Pin, ST7789T3 Driver, 42.72×60.26×2.35 mm, 250:1 Contrast Ratio, 30ms Response Time, TN Viewing Direction, -20°C~70°C Operating Temperature

1. Executive Summary & Product Positioning

The LS024T34-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 2.4-inch transmissive amorphous Silicon TFT-LCD (a-Si TFT-LCD) module.

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 SPI 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 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: SPI.
• Viewing Direction (Grayscale Inversion): TN.
• Drive IC: ST7789T3.
• Connector Pin Count: 18-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: TN TFT.
2. Resolution: 240*:** 240RGB320.
3. Viewing Direction: 6 O'CLOCK.
4. Operating Temperature: -20°C ~ 70°C.
5. Storage Temperature: -30°C ~ 80°C.
6. Backlight: FORE series and ONE parallel white LED.
7. Drive IC: ST7789T3.
8. ROHS Compliance: Yes.
9. General Tolerance: ±0.20 mm (unmarked).
10. Angular Tolerance: ∠ ±1/4°.
11. 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.
12. FPC Total Thickness: PI+FPC=0.3mm.
13. Backlight Thickness: BL 2.35±0.2mm.
14. Yellow Insulation Paper: Included for handling during assembly.
15. Release Tape/Sticker: Included (易撕贴).
16. White Silk Screen Line: Included for alignment (白色丝印线).
17. Backlight Circuit: IF=80mA, Vf=2.8~3.2V.

3.2 Electrical & Interface Specifications

3.2.1 Absolute Maximum Ratings

(Not explicitly provided in the extracted document excerpt; refer to Section 5 of the full specification.)

3.2.2 Electrical Characteristics (DC – Recommended Operating Conditions)

3.2.3 Pin Description (18-pin FPC)

Interface Summary:

• SPI Interface: Uses SDA (Data Input, Pin 8), SCL (Clock, Pin 9), SDO (Data Output, Pin 12), and RS (Data/Command, Pin 13) for communication.
• Backlight: Dedicated LED-A (Anode, Pin 6) and LED-K (Cathode, Pins 1, 2, 4, 5) pins.
• Power: VDD (Pin 11) for main logic, GND (Pins 7, 10) for ground.
• Touch Screen Pins: Pins 14-18 (YD, YU, DX, RY, XL) are NC (No Connect) for this module variant.

3.2.4 SPI Interface Timing Characteristics

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

3.2.5 Backlight Unit

Backlight Circuit Diagram (from document):

LED-A → [Backlight Circuit] → LED-K
IF = 80mA
VF = 2.8~3.2V

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 (TON) is the time between photo detector output intensity changed from 90% to 10%. And fall time (TOFF) is the time between photo detector output intensity changed from 10% to 90%.

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.

3.4 Version Record

4. Application Guidelines & Critical Notes

Intended Use

• Industrial control panels
• IoT display nodes
• Miniature handheld instruments
• Any application requiring a compact display with SPI interface

Critical Design Considerations

1. SPI Interface:

   • This module uses an SPI interface for communication.
   • The host MCU must have an SPI interface to drive the display.
   • The document provides detailed timing characteristics for the SPI interface, including setup times, hold times, and cycle times.

2. Power Supply:

   • Provide stable VCC (2.4V to 3.3V, 2.75V typical) for the main logic (connected to Pin 11).
   • Provide stable IOVCC (1.65V to 3.3V, 1.8V typical) for the I/O interface (connected to Pin 11).
   • The backlight requires a constant-current LED driver connected to LED-A (Anode, Pin 6) and LED-K (Cathode, Pins 1, 2, 4, 5), set to 80 mA at approximately 2.8~3.2V.

3. Mechanical Integration:

   • Module Outline: 42.72mm (H) × 60.26mm (V) × 2.35mm (D).
   • Active Area: 36.72mm × 48.96mm.
   • FPC: The module uses an 18-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.

4. Viewing Angle Characteristics:
   This is a TN panel:

   • Top (12 o'clock): 45° (Typ)
   • Bottom (6 o'clock): 20° (Typ)
   • Left (9 o'clock): 45° (Typ)
   • Right (3 o'clock): 45° (Typ)

   The module provides adequate viewing angles for standard applications, with the best viewing direction at 6 o'clock.

5. Optical Performance:

   • Response Time: 30ms (Typ) – suitable for most GUI applications.
   • Contrast Ratio: 250 (Typ) – adequate for indoor use.
   • Transmittance: 5.0% (Typ).
   • White Chromaticity (CIE1931): Wx = 0.308, Wy = 0.325 (Typical).

6. 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 an 18-pin FPC – handle with care.
• Avoid bending the FPC sharply, especially near the connector interface.
• The module has a total thickness of 2.35mm – be careful when handling to avoid flexing.

5. Conclusion & Design-In Support

The LS024T34-S-V1 specification details a standard 2.4-inch display module with an SPI interface and ST7789T3 driver — an excellent choice for applications requiring a standard resolution and SPI interface.

Key Strengths:

1. Standard Resolution (240x320): Suitable for simple icons, text, and basic UIs.

2. Standard SPI Interface: The SPI interface is simple and widely supported by most microcontrollers.

3. Standard 18-pin FPC: The 18-pin FPC provides a robust connection interface.

4. 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 SPI 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 2.8~3.2V.
  • Mechanical integration — the module outline is 42.72mm × 60.26mm × 2.35mm.
  • FPC connector — verify the 18-pin FPC.

This module is an excellent choice for designs requiring a standard 2.4-inch display with an SPI interface, such as industrial control panels, IoT devices, and miniature instruments.