LS0128I14-S-V1 1.28 inch TFT-LCD Module 240x240 262K Colors
Product Keywords: 1.28″ LCD Module, COG+FPC+B/L, 240(RGB)×240 Resolution, 262K Colors, Transmissive a-Si TFT-LCD, Free Viewing Angle, GC9A01 Driver, 4-Wire SPI Interface, 2 Chip-White LED Series (40mA), -10°C to +60°C Operation.
1. Executive Summary & Product Positioning
The LS0128I14-S-V1 is a 1.28-inch transmissive type a-Si TFT-LCD (amorphous silicon thin film transistor liquid crystal display) module developed by 立信(万安)智显科技有限公司 (Lesson Smart Display Technology Co., Ltd). The panel size is 1.28 inch and the resolution is 240(RGB)*240, the panel can display up to 262k colors.
Product Positioning: This compact module is well-suited for a wide range of applications such as smart wearables, handheld devices, portable instruments, and other embedded systems requiring a small, high-quality display with a simple SPI interface.
2. Detailed Product Overview & Architecture
The module's architecture is designed for robust performance and easy integration. The primary components include:
- TFT-LCD Panel: 1.28-inch diagonal, a-Si TFT active matrix, transmissive. Resolution is 240(RGB) × 240 pixels. It features a Free optimum viewing angle.
- Driver Circuit: The module integrates the GC9A01 driver IC, communicating via a 4-Wire SPI Interface.
- Backlight Unit (B/L): A white LED backlight with 2 Chip-White LEDs configured in series. The typical driving condition is IF=40mA, Vf=3.0V~3.4V.
- Mechanical Construction: COG (Chip-on-Glass) + FPC (with PI reinforcement, total thickness ~0.2mm) + B/L. The LCM module dimensions are 35.6 (W) × 37.74 (H) × 1.6 (D) mm.
- Interface: The module communicates via a 15-pin FPC connector. The display interface is 4-Wire SPI (Serial Peripheral Interface).
- Display Mode: Transmissive, a-Si TFT-LCD.
- RoHS: All materials are compliant with RoHS standards.
3. Exhaustive Technical Specifications
3.1 General & Mechanical Specifications
| Item | Specification |
| Display Size (Diagonal) | 1.28 inches |
| Resolution (Dots) | 240(RGB) × 240 |
| Display Technology | Active Matrix TFT, Transmissive, a-Si |
| Module Construction | COG+FPC+B/L |
| Color Depth | 262K Colors |
| Input Data Interface | 4-Wire SPI |
| Driver IC | GC9A01 |
| Module Size (H×V×D) | 35.6 × 37.74 × 1.6 mm |
| Active Area (H×V) | 32.4 × 32.4 mm |
| Pixel Arrangement | RGB Dot-matrix (240(RGB)×240) |
| Optimum Viewing Angle | FREE |
| Backlight Type | 2 Chip-White LEDs, Series |
| Operating Temperature | -10°C to +60°C |
| Storage Temperature | -20°C to +70°C |
| Environmental Compliance | RoHS |
3.2 Absolute Maximum Ratings
Stress beyond those listed may cause permanent damage to the device.
| Item | Symbol | Min | Max | Unit | Remark |
|---|---|---|---|---|---|
| Supply voltage (VCC) | VCC | -0.3 | 4.6 | V | Note1 Note2 |
| Supply voltage (IOVCC) | IOVCC | -0.3 | 4.6 | V | Note1 Note2 |
| Operating temperature | TOPR | -10 | 60 | °C | - |
| Storage temperature | TSTR | -20 | 70 | °C | - |
3.3 Electrical Characteristics
3.3.1 Recommended Operating Conditions
Condition: Ta=25°C.
| Item | Symbol | Min | Typ | Max | Unit | Remark |
|---|---|---|---|---|---|---|
| Supply voltage | VCI | 2.5 | 2.8 | 3.3 | V | Pin 13, 15 |
| Supply voltage (IO) | IOVCC | 1.65 | 1.8 | 3.3 | V | Pin 7 |
| Input Voltage (L level) | VIL | 0 | --- | 0.3*IOVCC | V | - |
| Input Voltage (H level) | VIH | 0.7*IOVCC | --- | IOVCC | V | - |
3.3.2 Backlight LED Characteristics
The backlight consists of 2 Chip-White LEDs in series. The driving condition is IF=40mA, Vf=3.0V~3.4V.
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Forward Voltage | Vf | 3.0 | - | 3.4 | V |
| Forward Current (Total) | IF | - | 40 | - | mA |
3.4 Interface Pin Assignment (15-Pin FPC)
The module communicates via a 15-pin FPC connector. The interface is 4-Wire SPI.
| PIN NO. | Symbol | Function Description |
|---|---|---|
| 1 | LEDK | Cathode of Backlight |
| 2 | SDA | Serial input data |
| 3 | LEDA | Anode of Backlight |
| 4 | SCL | clock signal. |
| 5 | NC | Open |
| 6 | RESET | Chip reset signal |
| 7 | IOVCC | Supply voltage to the interface pins (+1.8V or +3.3V) |
| 8 | CS | Serial chip select. |
| 9 | TE | Tearing effect output pin to synchronize MPU to frame writing, activated by S/W command |
| 10 | GND | Ground |
| 11 | RS | Data/command select signal |
| 12 | GND | Ground |
| 13 | VCI | Supply voltage to the analog circuit. (+2.8-3.3V) |
| 14 | GND | Ground |
| 15 | VCI | Supply voltage to the analog circuit. (+2.8-3.3V) |
3.5 Display Serial Interface Timing Characteristics (4-line SPI system)
Condition: Ta=25°C, IOVCC=1.65V to 3.3V, VCI=2.5V to 3.3V, AGND=VSS=0V.
| Signal | Symbol | Parameter | min | max | Unit |
|---|---|---|---|---|---|
| CSX | tcss | Chip select time (Write) | 20 | - | ns |
| CSX | tcsh | Chip select hold time (Read) | 40 | - | ns |
| SCL | twc | Serial Clock Cycle (Write) | 10 | - | ns |
| SCL | twrh | SCL "H" Pulse Width (Write) | 5 | - | ns |
| SCL | twrl | SCL "L" Pulse Width (Write) | 5 | - | ns |
| SCL | trc | Serial Clock Cycle (Read) | 150 | - | ns |
| SCL | trdh | SCL "H" Pulse Width (Read) | 60 | - | ns |
| SCL | trdl | SCL "L" Pulse Width (Read) | 60 | - | ns |
| D/CX | tas | D/CX setup time | 10 | - | ns |
| D/CX | tah | D/CX hold time (Write/Read) | 10 | - | ns |
| SDA/SDI (Input) | tds | Data setup time (Write) | 5 | - | ns |
| SDA/SDI (Input) | tdh | Data hold time (Write) | 5 | - | ns |
| SDA/SD0 (Output) | tacc | Access time (Read) | 10 | - | ns |
3.6 Electro-Optical Characteristics
Measuring Condition: Ta=25°C, dark room, 15min warm-up time.
| Item | Symbol | Condition | Min. | Typ. | Max. | Unit | Note |
|---|---|---|---|---|---|---|---|
| Color Chromaticity (White) | W_x, W_y | Normal Viewing Angle | -0.02 of Typ | (0.347, 0.347) | +0.02 of Typ | - | (1)(4) |
| Color Chromaticity (Red) | R_x, R_y | Normal Viewing Angle | -0.02 of Typ | (0.644, 0.333) | +0.02 of Typ | - | (1)(4) |
| Color Chromaticity (Green) | G_x, G_y | Normal Viewing Angle | -0.02 of Typ | (0.325, 0.566) | +0.02 of Typ | - | (1)(4) |
| Color Chromaticity (Blue) | B_x, B_y | Normal Viewing Angle | -0.02 of Typ | (0.134, 0.124) | +0.02 of Typ | - | (1)(4) |
| Viewing Angle (CR > 10) | ΘL, ΘR, ΘU, ΘD | Normal Viewing Angle | 80 | 85 | - | - | (1)(4) |
| Optima View Direction | - | - | - | Free | - | - | (5) |
3.7 Design Notes from Documentation
- B/L Driver: The backlight driving condition is IF=40mA, Vf=3.0V~3.4V for 2 LEDs in series. An external current source or current limiting resistor is required.
- Mechanical: LCM dimensions are 35.6 (W) × 37.74 (H) × 1.6 (D) mm. The module includes PI reinforcement on the FPC (total thickness 0.2mm). A silver paste dot (银浆点) is used for grounding. Unmarked tolerance is ±0.2mm.
- Interface: The module uses a standard 4-wire SPI interface with chip select (CS), serial clock (SCL), data/command (RS), and serial data (SDA). A TE (Tearing Effect) pin is also available.
- Power Supply: The module requires VCI (2.8V analog) and IOVCC (1.8V logic) power supplies. Ensure the power supply ripple is minimized.
- RoHS: All materials are ROHS compliant.
- Connector: The FPC has 15 pins.
4. Application Guidelines & Critical Notes
- Power Supply: The module requires VCI (2.8V) and IOVCC (1.8V) power supplies. Ensure the power supplies are stable and have low ripple.
- Interface: This module uses a standard 4-wire SPI protocol. The host processor must be configured for this protocol.
- Backlight Driver (External): A simple constant current source or current limiting resistor can be used to supply the backlight via the LEDA and LEDK pins. The required driving condition is 40mA total current at 3.0V~3.4V forward voltage.
- Reset: A hardware reset pin (RESET, Pin 6) is provided. Ensure proper reset timing as per the GC9A01 driver IC datasheet.
- Operating Temp: The module operates from -10°C to +60°C. Below 0°C, the response time of the liquid crystal becomes slower.
- Storage: Storage temperature range is -20°C to +70°C. Avoid high temperature and humidity during storage.
- Handling Precautions: Handle the module with care to avoid damage to the glass or FPC. Ground yourself to prevent electrostatic discharge (ESD). Avoid applying pressure to the display surface.
5. Conclusion & Design-In Support
The LS0128I14-S-V1 from Lesson Smart Display Technology is a compact 1.28-inch TFT-LCD module with a 4-wire SPI interface. It features an easy-to-use interface and a Free viewing angle. It is a reliable, high-quality display solution suitable for a wide variety of compact embedded display applications.
For successful design-in, engineers should:
- Obtain and review the complete, official Product Specification (Revision 1.0) for the full mechanical drawing and the driver IC (GC9A01) datasheet for detailed initialization and timing parameters.
- Design a clean 2.8V/1.8V power supply for the LCD. Design a backlight constant current driver circuit capable of delivering 40mA at up to 3.4V.
- Configure the host processor's SPI interface to match the timing specifications detailed in this datasheet.
- Contact the manufacturer for evaluation modules, sample requests, and further technical support during the design-in phase.
This module is designed to provide a reliable and vibrant display solution for a wide array of applications.
