LS0128I06-S-V2: 1.28-Inch IPS TFT LCD Module, 240x240 Resolution, 262K Colors, 4-Line Serial Interface, ST77912 Driver, for Compact Embedded Applications

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Product Subtitle / Keywords:
1.28 Inch IPS Display, Square 240x240 Resolution, Transmissive a-Si TFT, 4-Line Serial Interface (SPI), ST77912 Driver IC, COG+FPC+B/L, 262K Colors, -10°C to +60°C Operation, Detailed Serial Timing & Pinout

Comprehensive Technical Specification & Application Guide

1. Executive Summary & Product Positioning

The LS0128I06-S-V2, developed by LESSON (Wan‘an) Zhixian Technology Co., Ltd., is a compact 1.28-inch square transmissive amorphous Silicon TFT-LCD module. This product specification book serves as the definitive technical document, meticulously defining its structural composition (COG+FPC+B/L), mechanical dimensions, absolute maximum ratings, detailed electrical characteristics, precise 4-line serial interface timing, and electro-optical performance. It delivers a square resolution of 240(RGB)×240 with 262K-color display capability, featuring an IPS panel for wide, free viewing direction. The module is driven by the ST77912 controller via a 4-line serial interface. The unequivocal recommendation for manufacturing and application parties is to strictly adhere to this specification during selection, integration, and testing to ensure compatibility and that the module's performance meets the defined targets.

2. Detailed Product Overview & Architecture

  • Core Technology: Transmissive-type a-Si TFT-LCD.
  • Display Characteristics: Capable of displaying up to 262K 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.
  • Interface: 4-line serial interface (SPI), suitable for connection to microcontrollers with SPI peripherals.
  • Viewing Direction: Free (IPS), with no grayscale inversion.

3. Exhaustive Technical Specifications

3.1 Mechanical & Physical Specifications

  • Panel Size (Diagonal): 1.28 inches
  • Active Area (H×V): 32.4 mm × 32.4 mm
  • Module Size (H×V×D): 35.6 mm × 37.74 mm × 2.1 mm
  • Resolution: 240 (RGB) × 240 pixels
  • Display Mode: Active matrix TFT, Transmissive type
  • Drive IC: ST77912

3.2 Optical & Electro-Optical Characteristics (Ta=25°C, Typical)

  • Contrast Ratio (CR): 600 (Min), 800 (Typ) @ center, CR≥10:1
  • Response Time (Tr+Tf): 30 ms (Typ), 40 ms (Max)
  • Transmittance (T%): 3.0% (Min), 3.8% (Typ)
  • Viewing Angle (CR>10): 80° (Min) for all directions (Top, Bottom, Left, Right).
  • Color Chromaticity (White): W x, W y: TBD (To Be Determined)

3.3 Electrical & Interface Specifications

3.3.1 Absolute Maximum Ratings

Item Symbol Min Max Unit Remark
Supply voltage VCC -0.3 4.6 V Note1,2
Supply voltage IOVCC -0.3 4.6 V Note1,2
Operating temperature TOPR -10 60 °C Note1,2
Storage temperature TSTR -20 70 °C Note1,2

3.3.2 Electrical Characteristics (DC, Ta=25°C)

Item Symbol Min Typ Max Unit Remark
Supply voltage VCC 2.65 2.8 3.3 V Note1
I/O Supply voltage IOVCC 1.65 1.8 3.3 V Note1
Input Voltage (L) VIL 0 -- 0.3*IOVCC V Note1
Input Voltage (H) VIH 0.7*IOVCC -- IOVCC V Note1

3.3.3 Pin Description (15-pin FPC)

PIN NO. Symbol I/O Description
1 LEDK P Power for LED backlight cathode
2 GND P Ground
3 TE O Tearing effect output pin
4 SDA I/O Serial data input/output
5 RS I Command/Data select pin
6 SCL I Serial clock pin
7 CS I Chip select pin
8 RESET I Reset pin
9 IOVCC1.8V P I/O power supply (1.8V)
10, 11 VCC2.8V P Analog power supply (2.8V)
12, 13 GND P Ground
14, 15 LEDA P Power for LED backlight anode

3.3.4 4-Line Serial Interface Timing Characteristics (VDDI=1.65-3.3V, VDD=2.65-3.3V, Ta=25°C)

Key parameters for Write and Read operations:

Signal Symbol Parameter MIN MAX Unit
CSX T_CSS Chip select setup (Write) 15 -- ns
CSX T_CSH Chip select hold (Write) 15 -- ns
SCL T_SCYCW SCL cycle (Write) 16 -- ns
SCL T_SCYCR SCL cycle (Read) 150 -- ns
SDA (DIN) T_SDS Data setup time 7 -- ns
SDA (DIN) T_SDH Data hold time 7 -- ns
DOUT T_ACC Access time (Read) 10 50 ns

3.3.5 Backlight Unit

  • Light Source: 2 x White LEDs.
  • Drive Condition: Forward Current (If) = 40mA; Forward Voltage (Vf) = 3.0V ~ 3.4V.

4. Application Guidelines & Critical Notes

  • Intended Use: Wearable devices, compact IoT displays, handheld instruments, auxiliary displays—any space-constrained application requiring a small, colorful square display.
  • Critical Design Considerations:
    1. Power Supplies: Provide clean and stable 2.8V (VCC) and 1.8V (IOVCC) supplies as per the electrical characteristics.
    2. Interface Timing: The host microcontroller's SPI peripheral must meet the detailed setup, hold, and cycle times provided for both write and read operations.
    3. Backlight Driver: Use a constant-current driver circuit capable of providing 40mA for the two parallel LEDs.
    4. Reset Circuit: Implement a proper reset circuit. Ensure RESET is held low during power-up and released according to the driver IC's requirements.
    5. Tearing Effect (TE): The TE pin can be used to synchronize the MPU frame writing to the LCD's refresh, reducing tearing artifacts.
  • Handling: Observe standard ESD precautions during handling and assembly.

5. Conclusion & Design-In Support

The LS0128I06-S-V2 specification provides all necessary parameters for integrating a reliable and compact 1.28-inch IPS display. Its key strengths are the detailed 4-line serial interface timing and clear pinout, enabling straightforward connection to most microcontrollers. Success requires careful attention to the dual power supply requirements (2.8V & 1.8V) and adherence to the SPI timing parameters, especially the significantly longer clock cycle required for read operations. By following the electrical and mechanical limits, designers can leverage this module to add a crisp, colorful square display to their most compact embedded designs.