Product Subtitle / Keywords:
2.8 Inch Display, 240(RGB)×320 Resolution, Transmissive a-Si TFT-LCD, 8bit 8080 / SPI Interface, COG+FPC+B/L, 262K Colors, 24-Pin, ST7789P3 Driver, 50.0×69.1×2.3 mm, 500:1 Contrast Ratio, 16ms Response Time, TN Viewing Direction, -10°C~60°C Operating Temperature

1. Executive Summary & Product Positioning

The LS028T10-M-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 2.8-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 8bit 8080 / 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 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: 8bit 8080 /SPI.
• Viewing Direction (Grayscale Inversion): TN.
• Drive IC: ST7789P3.
• Connector Pin Count: 24-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: 2.8" TFT, TRANSMISSIVE.
2. Resolution: 240RGBX320 DOTS.
3. Viewing Direction: 12:00.
4. Operating Temperature: -20°C ~ 70°C.
5. Storage Temperature: -30°C ~ 80°C.
6. Backlight: 4 Chip-White LED Parallel.
7. ROHS Compliance: Yes.
8. General Tolerance: ±0.20 mm.
9. Angular Tolerance: ∠ ±1/4°.
10. 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.
11. FPC Total Thickness: PI补强+FPC总厚=0.3mm.
12. Backlight Thickness: BL 2.30±0.20mm.
13. Polarizer Thickness: POL 0.15mm.
14. Silver Paste Points: Present on the module.
15. Yellow Insulation Paper: Included for handling during assembly.
16. Release Tape/Sticker: Included (易撕贴).
17. Alignment Mark: White silk screen line (白色丝印线).
18. 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 (24-pin FPC)

Interface Mode Selection (from document):

Interface Summary:

• Dual Interface Support: The module supports 8080 MCU parallel interface (8-bit) and SPI serial interface modes. The interface mode is selected via the IM0, IM1, IM2 pins.
• 8080 Parallel Interface: Uses DB0-DB7 (8-bit data bus), WR (Write), RD (Read), RS (Data/Command), CS (Chip Select), and RES (Reset) for communication.
• SPI Serial Interface: Uses SDA (Serial Data), RS (Serial Clock/SCL), CS (Chip Select), and RES (Reset) for communication.
• Backlight: Dedicated LEDA (Anode, Pin 3) and LEDK (Cathode, Pin 2) pins.
• Power: VDD2.8V (Pins 5, 20) for main logic, GND (Pins 1, 4, 24) for ground.

3.2.4 Backlight Unit

Backlight Circuit Diagram (from document):

LEDA → [Backlight Circuit] → LEDK
IF = 80mA
VF = 3V (TYP)

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

Notes (from document):

Note 1: Definition of Response Time
The electro-optical response time measurements shall be made by switching the “data” input signal ON and OFF. The times needed for the luminance to change from 10% to 90% is Td, and 90% to 10% is Tr.

Note 2: Definition of Contrast Ratio
Contrast ratio (CR) is defined mathematically by the following formula:
Contrast Ratio = Luminance when displaying a white raster / Luminance when displaying a black raster

Note 3: Definition of Viewing Angle
Viewing angle is the angle at which the contrast ratio is greater than 10. The viewing are determined for the horizontal or 3, 9 o'clock direction and the vertical or 6, 12 o'clock direction with respect to the optical 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

• Industrial control panels
• IoT display nodes
• Miniature handheld instruments
• Any application requiring a compact display with standard resolution and interface flexibility

Critical Design Considerations

1. Dual Interface Support (8bit 8080 / SPI):

   • This module supports two interface modes: 8bit 8080 parallel and SPI serial.
   • The interface mode is selected via the IM0, IM1, IM2 pins.
   • For 8080 parallel mode: Use DB0-DB7 (8-bit data bus), WR (Write), RD (Read), RS (Data/Command), CS (Chip Select), and RES (Reset).
   • For SPI serial mode: Use SDA (Serial Data), RS (Serial Clock/SCL), CS (Chip Select), and RES (Reset).
   • The host MCU must support the selected interface mode.

2. Power Supply:

   • Provide stable VCC (2.4V to 3.3V, 2.75V typical) for the main logic (connected to Pins 5, 20).
   • 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, Pin 3) and LEDK (Cathode, Pin 2), set to 80 mA at approximately 3V (TYP).

3. Interface Mode Selection:

   • The module uses IM0, IM1, IM2 pins to select the interface mode.
   • Ensure the correct interface mode is selected and configured in the system design.
   • The document provides a table for interface mode selection.

4. Mechanical Integration:

   • Module Outline: 50.0mm (H) × 69.1mm (V) × 2.3mm (D).
   • Active Area: 43.2mm × 57.6mm.
   • FPC: The module uses a 24-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 a TN panel:

   • Top (12 o'clock): 45° (Typ)
   • Bottom (6 o'clock): 45° (Typ)
   • Left (9 o'clock): 50° (Typ)
   • Right (3 o'clock): 20° (Typ)

   The module provides adequate viewing angles for standard applications, with the best viewing direction at 12 o'clock.

6. Optical Performance:

   • Response Time: 16ms (Typ), 25ms (Max) – fast enough for most GUI applications.
   • Contrast Ratio: 300 (Min), 500 (Typ) – good contrast performance.
   • Transmittance: 4.7% (Typ).
   • White Chromaticity (CIE1931): Wx = 0.304, Wy = 0.344 (Typical).
   • Luminance (IF = 80mA): 350 cd/m² (Typ) – high brightness for good readability.

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 24-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 LS028T10-M-V1 specification details a standard 2.8-inch display module with dual 8bit 8080 / SPI interface and ST7789P3 driver — an excellent choice for applications requiring interface flexibility and standard resolution.

Key Strengths:

1. Dual Interface Support: The module supports both 8bit 8080 parallel and SPI serial interfaces, providing flexibility for different system architectures.

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

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

4. Fast Response Time: 16ms (Typ) – suitable for most GUI applications.

5. Standard 24-pin FPC: The 24-pin FPC provides a robust connection interface.

6. Good Contrast Ratio: 500:1 (Typ) provides adequate image quality.

Main Design Focus:

• The critical design task is selecting and properly implementing the correct interface mode (8bit 8080 or SPI) based on the host system's capabilities.
• 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 24-pin FPC.
  • Interface mode selection — ensure the correct pin configuration for the selected interface mode.

This module is an excellent choice for designs requiring a standard 2.8-inch display with flexible interface options, such as industrial control panels, IoT devices, and miniature instruments.