Product Main Title:
LS0144T09-S-V1: 1.44-Inch TFT LCD Module, 128x128 Resolution, 262K Colors, 4-Line Serial Interface, Revised Mechanical & Electrical Specs
Product Subtitle / Keywords:
1.44 Inch TFT Display, 128x128 Resolution, Transmissive a-Si TFT, 4-Line Serial Interface (SPI), COG+FPC+B/L, 262K Colors, Updated Package & Ratings, Detailed SPI Timing
Comprehensive Technical Specification & Application Guide
1. Executive Summary & Product Positioning
The LS0144T09-S-V1, developed by LESSON (Wan'an) Zhixian Technology Co., Ltd., is a 1.44-inch transmissive a-Si TFT-LCD module, serving as a variant or updated version of the LS0144T08 series. This product specification defines its structural composition, showcasing revised mechanical dimensions and updated absolute maximum ratings compared to the T08 model. It maintains the 128(RGB)×128 resolution and 262K-color capability with a 4-line serial interface. The document provides the essential electrical, interface, and optical parameters required for system integration. Engineers should note the differences in package size, voltage ratings, and pinout from the T08 model and use this document as the sole reference for the LS0144T09-S-V1 during design.
2. Detailed Product Overview & Architecture
- Core Technology: Transmissive-type a-Si TFT-LCD.
- Display Characteristics: Capable of displaying up to 262K colors.
- Module Construction: Composed of a TFT-LCD panel, a driver circuit, and a backlight unit.
- Interface: 4-line serial interface (SPI).
3. Exhaustive Technical Specifications
3.1 Mechanical & Physical Specifications
- Panel Size (Diagonal): 1.44 inches
- Active Area (H×V): 25.5 mm × 26.5 mm
- Module Size (H×V×D): 29.5 mm × 36.5 mm × 2.5 mm (Note: Larger than T08 model)
- Resolution: 128 (RGB) × 128 pixels
3.2 Electrical & Interface Specifications
3.2.1 Absolute Maximum Ratings (Differ from T08)
| Item | Symbol | Min | Max | Unit | Remark |
|---|---|---|---|---|---|
| Supply voltage | VCC | -0.3 | 4.6 | V | Note1,2 |
| I/O Supply voltage | IOVCC | -0.3 | 4.6 | V | Note1,2 |
| Operating temperature | TOPR | -20 | 70 | °C | Note1,2 |
| Storage temperature | TSTR | -30 | 80 | °C | Note1,2 |
3.2.2 Electrical Characteristics (DC, Ta=25°C)
| Item | Symbol | Min | Typ | Max | Unit | Remark |
|---|---|---|---|---|---|---|
| Supply voltage (Main) | VCC | 2.6 | 2.8 | 3.3 | V | |
| I/O Supply voltage | IOVCC | 1.65 | 1.8 | 3.3 | V | |
| Input Voltage (L) | VIL | 0 | -- | 0.3*IOVCC | V | |
| Input Voltage (H) | VIH | 0.7*IOVCC | -- | IOVCC | V |
3.2.3 Pin Description (14-pin FPC) (Different pin assignment from T08)
| PIN NO. | Symbol | I/O | Description |
|---|---|---|---|
| 1 | NC | Not Connected. | |
| 2 | GND | P | Ground. |
| 3 | LEDK | P | Power for LED backlight anode. (Note: Labeled as anode but typically cathode) |
| 4 | LEDA | P | Power for LED backlight cathode. (Note: Labeled as cathode but typically anode) |
| 5 | GND | P | Ground. |
| 6 | RESET | I | Reset signal. |
| 7 | RS | I | Data/command selection pin. |
| 8 | SDA | I/O | Serial input/output data. |
| 9 | SCL | I | Clock signal. |
| 10 | VCI | P | Power supply. |
| 11 | IOVCC | P | I/O power supply. |
| 12 | CS | I | Chip selection signal. |
| 13 | GND | P | Ground. |
| 14 | TE | O | Tearing effect output pin. |
Important Note: The pin functions for LEDK/LEDA appear swapped from conventional naming (K for Cathode, A for Anode). Verify polarity with the supplier or schematic.
3.2.4 Critical Interface Timing
A. Reset & Power Sequencing: The document emphasizes that if the RESET line is not held stable by the host during the power-on sequence, a hardware reset must be applied afterwards to guarantee operation. Detailed power-on timing diagrams are provided, showing relationships between VCI, IOVCC, CSX, and RESX signals.
B. 4-Line Serial Interface Timing: Provides comprehensive timing parameters for both Write and Read operations, including:
- Chip select time (
tcss,tcsh). - Serial clock cycle and H/L pulse width for Write (
twc,twrh,twrl) and Read (trc,trdh,trdl). - Data setup/hold time (
tds,tdh). - Data access time (
tacc).
Example values: twc min 12.5 ns (Write), trc min 150 ns (Read).
3.2.5 Backlight Unit
- Configuration: Likely white LED(s). Specific details inferred from similar models.
- Drive Condition: Forward Current (I_F) = 40mA (Typical, from optical specs).
3.3 Optical & Electro-Optical Characteristics (Ta=25°C)
| Item | Symbol | Condition | Min. | Typ. | Max. | Unit | Remark |
|---|---|---|---|---|---|---|---|
| Response Time | Tr + Tf | θx=θy=0 | - | - | 32 | ms | |
| Contrast Ratio | CR | θx=θy=0 | 400 | 600 | - | - | |
| Transmittance | T% | θx=θy=0 | - | 17.5 | - | % | |
| Viewing Angle (CR>10) | θT, θB, θL, θR | - | 60 | - | - | Deg. | |
| Luminance | L | I_F=40mA | - | 260 | - | cd/m² | |
| Color Chromaticity (Red) | Rx, Ry | θx=θy=0 | - | 0.625, 0.313 | - | - |
4. Application Guidelines & Critical Notes
- Intended Use: Similar to T08 model: compact embedded devices where a slightly different form factor or updated electrical ratings are required.
- Critical Design Considerations:
- Form Factor Change: The module is physically larger (29.5x36.5x2.5mm) than the T08 model. Ensure it fits your mechanical design.
- Updated Voltage Ratings: Note the revised absolute max and operating ranges for VCC and IOVCC compared to T08.
- Different Pinout: The pin assignment is completely different from the T08 model. Do not assume compatibility. Design your FPC connector footprint accordingly.
- LED Polarity Caution: Double-check the backlight LED polarity (pins 3 & 4) to avoid incorrect connection.
- Strict Reset Requirement: Heed the note about holding RESET stable during power-up or applying a reset afterward.
- SPI Timing: Adhere to the provided serial interface timing, noting the faster write clock (
twcmin 12.5ns) compared to some other models.
- Handling: Standard ESD precautions apply.
5. Conclusion & Design-In Support
The LS0144T09-S-V1 specification outlines a 1.44-inch display module that is mechanically and electrically distinct from the LS0144T08-S-V1. Its primary importance lies in the new pinout, larger package, and modified voltage ratings. Successful integration requires treating it as a unique component, carefully mapping the new pin connections, and respecting the reset stability requirement. Designers should obtain the complete mechanical drawing for precise dimensions. By using this document as the sole reference for the T09 model, compatibility issues can be avoided.
