Product Main Title:
LS019I05-S-V1: 1.9-Inch Transmissive a-Si TFT LCD Module, 170x320 Resolution, 262K Colors, SPI Interface
Product Subtitle / Keywords:
1.9 Inch Display, 170(RGB)x320 Resolution, Transmissive a-Si TFT, SPI Interface, COG+FPC+B/L, 262K Colors, Standard Temperature Range, RoHS Compliant
Comprehensive Technical Specification & Application Guide
1. Executive Summary & Product Positioning
The LS019I05-S-V1, developed by LESSON (Wan'an) Zhixian Technology Co., Ltd., is a 1.9-inch transmissive amorphous Silicon TFT-LCD module. This product specification book serves as the definitive technical document, defining its structural composition, mechanical dimensions, absolute maximum ratings, detailed electrical characteristics, SPI (Serial Peripheral Interface) functionality, and electro-optical performance. It delivers a resolution of 170(RGB)×320 with 262K-color display capability. The document provides the core parameters necessary for system integration into space-constrained embedded devices. Engineers should use this document to guide the electrical connection, SPI driver development, and environmental design of the module, ensuring operation within the specified voltage and temperature limits to achieve reliable performance.
2. Detailed Product Overview & Architecture
- Core Technology: Transmissive-type a-Si TFT-LCD (amorphous silicon thin film transistor liquid crystal display).
- Display Characteristics: Capable of displaying up to 262 thousand colors.
- Module Construction: Composed of a TFT-LCD panel, a driver circuit, and a backlight unit. (Specific construction like COG+FPC+B/L is implied from similar models).
- Interface: SPI (Serial Peripheral Interface) – a 4-line serial interface.
- Panel Size: 1.9 inch diagonal.
3. Exhaustive Technical Specifications
3.1 Mechanical & Physical Specifications
| Item | Specification | Unit |
|---|---|---|
| Module size (H×V×D) | 25.8 × 49.73 × 2.07 | mm |
| Active area (H×V) | 22.695 × 42.72 | mm |
| Number of dots / Resolution | 170(RGB) × 320 | pixel |
| Panel Size (Diagonal) | 1.9 | inch |
3.2 Electrical & Interface Specifications
3.2.1 Absolute Maximum Ratings
| Item | Symbol | Min | Max | Unit | Remark |
|---|---|---|---|---|---|
| Supply voltage | VCC | -0.3 | 4.6 | V | Note1, Note2 |
| I/O Supply voltage | IOVCC | -0.3 | 4.6 | V | Note1, Note2 |
| Operating temperature | TOPR | -20 | 70 | °C | Note1, Note2 |
| Storage temperature | TSTR | -30 | 80 | °C | Note1, Note2 |
Notes (from general spec conventions):
- Note1: Stresses beyond these ratings may cause permanent damage.
- Note2: Functional operation under these conditions is not implied.
3.2.2 Pin Description (12-pin FPC)
| PIN NO. | Symbol | I/O | Description |
|---|---|---|---|
| 1 | LEDK | P | Power for LED backlight cathode. |
| 2 | LEDA | P | Power for LED backlight anode. |
| 3 | GND | P | Ground. |
| 4 | SPI_CS | I | Chip select pin. |
| 5 | SPI_SCL | I | Serial clock pin. |
| 6 | SPI_RS | I | Command and Data select pin (also called D/C or RS). |
| 7 | SPI_SDA | I/O | Serial data input/output pin. |
| 8 | RESET | I | Reset pin. |
| 9 | VCC | P | Main power supply. |
| 10 | GND | P | Ground. |
| 11 | TE | O | Tearing effect output signal. Used to synchronize MCU writing to frame memory. |
| 12 | GND | P | Ground. |
Interface Summary: This is a standard 4-line SPI interface using CS, SCL, SDA, and RS (Register Select) pins. The TE pin provides a synchronization signal for efficient graphics updates.
3.2.3 SPI Interface Timing Characteristics
Conditions: VDDI=1.65 to 3.3V, VDD=2.4 to 3.3V, AGND=DGND=0V, Ta=25°C.
A. Write Operation Timing:
| Signal | Symbol | Parameter | MIN | MAX | Unit | Description |
|---|---|---|---|---|---|---|
| CSX | T_CSS | Chip select setup time (write) | 15 | -- | ns | |
| CSX | T_CSH | Chip select hold time (write) | 15 | -- | ns | |
| CSX | T_CHW | Chip select "H" pulse width | 40 | -- | ns | |
| SCL | T_SCYCW | Serial clock cycle (Write) | 16 | -- | ns | For write command & data |
| SCL | T_SHW | SCL "H" pulse width (Write) | 7 | -- | ns | For write command & data |
| SCL | T_SLW | SCL "L" pulse width (Write) | 7 | -- | ns | For write command & data |
| D/CX | T_DCS | D/CX setup time | 10 | -- | ns | |
| D/CX | T_DCH | D/CX hold time | 10 | -- | ns | |
| SDA (DIN) | T_SDS | Data setup time | 7 | -- | ns | |
| SDA (DIN) | T_SDH | Data hold time | 7 | -- | ns |
B. Read Operation Timing:
| Signal | Symbol | Parameter | MIN | MAX | Unit | Description |
|---|---|---|---|---|---|---|
| CSX | T_CSS | Chip select setup time (read) | 60 | -- | ns | |
| CSX | T_SCC | Chip select hold time (read) | 65 | -- | ns | |
| SCL | T_SCYCR | Serial clock cycle (Read) | 150 | -- | ns | For read command & data |
| SCL | T_SHR | SCL "H" pulse width (Read) | 60 | -- | ns | For read command & data |
| SCL | T_SLR | SCL "L" pulse width (Read) | 60 | -- | ns | For read command & data |
| DOUT | T_ACC | Access time | 10 | 50 | ns | For maximum CL=30pF |
| DOUT | T_OH | Output disable time | 15 | 50 | ns | For maximum CL=30pF |
3.3 Optical & Electro-Optical Characteristics
(Note: Specific values for Luminance, Contrast Ratio, Viewing Angles, Response Time, etc., are contained in Section 8 of the specification but are not provided in the given context excerpt. The full document must be consulted for complete optical tables.)
4. Application Guidelines & Critical Notes
- Intended Use: Wearable devices, small handheld instruments, IoT device interfaces, medical sensors, hobbyist projects—applications requiring a very compact, low-power color display with a simple serial interface.
- Critical Design Considerations:
- Absolute Maximum Ratings: Never exceed the -0.3V to +4.6V range on VCC and IOVCC pins, or the -20°C to +70°C operating temperature.
- SPI Interface: The host MCU's SPI peripheral must be configured to meet the setup, hold, and pulse width timings specified above. Note the significantly slower clock cycle (150ns min) required for read operations compared to writes (16ns min).
- TE Pin Utilization: The Tearing Effect (TE) output pin can be connected to a microcontroller interrupt pin to synchronize frame buffer updates with the display's refresh cycle, preventing visual tearing.
- Reset Circuit: Ensure the RESET pin is driven low for a sufficient period during power-up (typical requirement >10µs). A pull-up resistor and an MCU GPIO are standard.
- Backlight Drive: Design a constant-current driver circuit for the backlight LEDs. Connect LEDA (anode) to the positive supply and LEDK (cathode) to the current sink. The forward current (I_F) specification is required from the full optical characteristics table.
- Power Supply: Although the absolute max is 4.6V, the typical operating VCC is likely between 2.8V and 3.3V (inferred from similar models). IOVCC may be the same or a lower voltage (e.g., 1.8V). The full DC characteristics table should be checked.
- Multiple Ground Pins: Connect all GND pins (3, 10, 12) to a solid ground plane for noise immunity.
- Handling & Compliance: The document states the module is ROHS compliant. Observe standard ESD precautions during handling.
5. Conclusion & Design-In Support
The LS019I05-S-V1 specification provides a solid foundation for integrating a compact 1.9-inch SPI display module. Its key defined parameters are the mechanical dimensions, absolute maximum ratings, detailed SPI pinout, and comprehensive AC timing characteristics. The presence of a TE pin is a valuable feature for smooth graphics rendering. Successful integration requires the complete specification document to obtain the missing DC electrical characteristics (typical VCC, IOVCC, current consumption) and the complete optical performance tables. With that information, designers can confidently proceed with power supply design, SPI driver software development, and mechanical integration, resulting in a reliable implementation of this ultra-small color display.
