LS19I03-SM-V1 1.9 inch TFT-LCD Module 170x320 262k Colors IPS
Product Keywords: 1.9″ LCD Module, COG+FPC+B/L, 170(RGB)×320 Resolution, 262K Colors, IPS Viewing Direction (Grayscale Inversion), ST7789T3 Driver IC, SPI (4-Line) / 8080 Interface, 4 Chip-White LED Parallel (80mA), -20°C to +70°C Operation.
1. Executive Summary & Product Positioning
The LS19I03-SM-V1 is a 1.9-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). It is composed of a TFT-LCD panel, a driver circuit, and a backlight unit. The panel size is 1.9 inch and the resolution is 170(RGB)*320, the panel can display up to 262k colors.
Product Positioning: This module features a 1.9-inch IPS (In-Plane Switching) panel, offering wide viewing angles (IPS) and high contrast ratio. With a standard SPI/8080 interface, it is well-suited for a wide range of applications such as industrial control panels, smart home devices, medical equipment, and other embedded systems requiring a compact and high-quality display.
2. Detailed Product Overview & Architecture
The module's architecture is designed for robust performance and easy integration. The primary components include:
- TFT-LCD Panel: 1.9-inch diagonal, a-Si TFT active matrix, transmissive, IPS mode. Resolution is 170(RGB) × 320 pixels with an active area of 22.7 (H) × 42.72 (V) mm.
- Driver IC: The module uses the ST7789T3 driver IC, communicating via a serial interface.
- Backlight Unit (B/L): A white LED backlight with 4 Chip-White LEDs configured in parallel. The typical driving condition is IF=80mA, Vf=3.0V (TYP).
- Mechanical Construction: COG (Chip-on-Glass) + FPC + B/L. The module outline dimensions are 25.8 (H) × 49.73 (V) × 1.47 (D) mm.
- Interface: The module communicates via a 26-pin FPC connector. The display interface supports SPI (4-Line) Interface and 8080 MCU 8-bit Parallel Interface, selectable via the IM1/2 pin. Pin 8: IM1/2=1 selects 4-line SPI (serial), IM1/2=0 selects MCU 80-8bit parallel interface.
- Display Mode: Transmissive, IPS.
- Viewing Direction (Grayscale Inversion): IPS.
3. Exhaustive Technical Specifications
3.1 General & Mechanical Specifications
| Item | Specification |
| Display Size (Diagonal) | 1.9 inches |
| Resolution (Dots) | 170(RGB) × 320 |
| Display Technology | Active Matrix TFT, Transmissive, a-Si, IPS |
| Module Construction | COG+FPC+B/L |
| Color Depth | 262K Colors |
| Viewing Direction (Grayscale Inversion) | IPS |
| Input Data Interface | SPI (4-Line) / 8080 MCU 8-bit Parallel |
| Driver IC | ST7789T3 |
| Module Size (H×V×D) | 25.8 × 49.73 × 1.47 mm |
| Active Area (H×V) | 22.7 × 42.72 mm |
| Pixel Arrangement | RGB Dot-matrix |
| Display Mode | Transmissive, IPS |
| Backlight Type | 4 Chip-White LED, Parallel |
| Operating Temperature | -20°C to +70°C |
| Storage Temperature | -30°C to +80°C |
3.2 Absolute Maximum Ratings (Ta=25°C)
Stress beyond those listed may cause permanent damage.
| Item | Symbol | Min | Max | Unit | Remark |
|---|---|---|---|---|---|
| Supply voltage | VCC | -0.3 | 4.6 | V | Note1 Note2 |
| 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 |
3.3 Electrical Characteristics
3.3.1 Recommended Operating Conditions
Condition: VDDI=1.65 to 3.3V, VDD=2.4 to 3.3V, AGND=DGND=0V, Ta=25°C.
| Item | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply voltage | VCC | 2.4 | 2.8 | 3.3 | V |
| Supply voltage | IOVCC | 1.65 | 1.8 | 3.3 | V |
| 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 4 Chip-White LEDs in Parallel. The backlight drive condition is IF=80mA, Vf=3.0V (TYP).
| Parameter | Symbol | Typ | Unit |
|---|---|---|---|
| Forward Voltage | Vf | 3.0 | V |
| Forward Current | If | 80 | mA |
3.4 Interface Pin Assignment (26-Pin FPC)
Connector: 26-pin FPC. Interface: SPI (4-Line Serial) or 8080 MCU 8-bit Parallel (Selectable via IM1/2 pin).
Interface Configuration: Pin 8 (IM1/2) = 1 for SPI (4-line serial), Pin 8 = 0 for MCU 80-8bit Parallel.
| PIN NO. | Symbol | I/O | Description |
|---|---|---|---|
| 1 | RESET | I | This signal will reset the device and it must be applied to properly initialize the chip. |
| 2 | RS | I | Display data/command selection pin in parallel interface. -This pin is used to be serial interface clock. DCX='1': display data or parameter. DCX='0': command data. -If not used, please fix this pin at VDDI or DGND |
| 3 | WR | I | Write enable in MCU parallel interface. - Display data/command selection pin in 4-line serial interface. - Second Data lane in 2 data lane serial interface. -If not used, please fix this pin at VDDI or DGND. |
| 4 | RD | I | Read enable in 8080 MCU parallel interface. -If not used, please fix this pin at VDDI or DGND |
| 5 | CS | I | Chip selection pin |
| 6 | VCC | P | Power supply |
| 7 | IOVCC | P | Power supply |
| 8 | IM1/2 | I | 1: 4-line 8bit serial I/F (SPI) 0: 80-8bit parallel I/F (8080 MCU) |
| 9 | SPI_SDA | I/O | SPI interface input/output pin. |
| 10 | GND | P | Ground |
| 11 | LEDA | P | Power for LED backlight anode |
| 12 | LEDA | P | Power for LED backlight anode |
| 13 | D7 | I | data bus |
| 14 | D6 | I | data bus |
| 15 | D5 | I | data bus |
| 16 | D4 | I | data bus |
| 17 | D3 | I | data bus |
| 18 | D2 | I | data bus |
| 19 | D1 | I | data bus |
| 20 | D0 | I | data bus |
| 21 | TP_VCC | P | NC |
| 22 | TP_SCL | I | NC |
| 23 | TP_SDA | I | NC |
| 24 | TP_RESET | I | NC |
| 25 | TP_INT | I | NC |
| 26 | GND | P | Ground |
3.5 Timing Characteristics
3.5.1 8080 Series MCU Parallel Interface Characteristics: 18/16/9/8-bit Bus
Test conditions: VDDI=1.65 to 3.3V, VDD=2.4 to 3.3V, AGND=DGND=0V, Ta=25°C.
| Signal | Symbol | Parameter | Min | Max | Unit | Description |
|---|---|---|---|---|---|---|
| D/CX | TAST | Address setup time | 0 | -- | ns | - |
| D/CX | TAHT | Address hold time (Write/Read) | 10 | -- | ns | - |
| CSX | TCHW | Chip select "H" pulse width | 0 | -- | ns | - |
| CSX | TCS | Chip select setup time (Write) | 15 | -- | ns | - |
| CSX | TRCS | Chip select setup time (Read ID) | 45 | -- | ns | - |
| CSX | TRCSFM | Chip select setup time (Read FM) | 355 | -- | ns | - |
| CSX | TCSF | Chip select wait time (Write/Read) | 10 | -- | ns | - |
| CSX | TCSH | Chip select hold time | 10 | -- | ns | - |
| WRX | TWC | Write cycle | 66 | -- | ns | - |
| WRX | TWRH | Control pulse "H" duration | 15 | -- | ns | - |
| WRX | TWRL | Control pulse "L" duration | 15 | -- | ns | - |
| RDX (ID) | TRC | Read cycle (ID) | 160 | -- | ns | When read ID data |
| RDX (ID) | TRDH | Control pulse "H" duration (ID) | 90 | -- | ns | When read ID data |
| RDX (ID) | TRDL | Control pulse "L" duration (ID) | 45 | -- | ns | When read ID data |
| RDX (FM) | TRCFM | Read cycle (FM) | 450 | -- | ns | When read from frame memory |
| RDX (FM) | TRDHFM | Control pulse "H" duration (FM) | 90 | -- | ns | When read from frame memory |
| RDX (FM) | TRDLFM | Control pulse "L" duration (FM) | 355 | -- | ns | When read from frame memory |
| D[17:0] | TDST | Data setup time | 10 | -- | ns | For CL=30pF |
| D[17:0] | TDHT | Data hold time | 10 | -- | ns | For CL=30pF |
3.5.2 4-Line Serial Interface Characteristics
Test conditions: VDDI=1.65 to 3.3V, VDD=2.4 to 3.3V, AGND=DGND=0V, Ta=25°C.
| Signal | Symbol | Parameter | MIN | MAX | Unit | Description |
|---|---|---|---|---|---|---|
| CSX | TCSS | Chip select setup time (write) | 15 | -- | ns | - |
| CSX | TCSH | Chip select hold time (write) | 15 | -- | ns | - |
| CSX | TCSS | Chip select setup time (read) | 60 | -- | ns | - |
| CSX | TSCC | Chip select hold time (read) | 65 | -- | ns | - |
| CSX | TCHW | Chip select "H" pulse width | 40 | -- | ns | - |
| SCL | TSCYCW | Serial clock cycle (Write) | 16 | -- | ns | -write command & data ram |
| SCL | TSHW | SCL "H" pulse width (Write) | 7 | -- | ns | -write command & data ram |
| SCL | TSLW | SCL "L" pulse width (Write) | 7 | -- | ns | -write command & data ram |
| SCL | TSCYCR | Serial clock cycle (Read) | 150 | -- | ns | -read command & data ram |
| SCL | TSHR | SCL "H" pulse width (Read) | 60 | -- | ns | -read command & data ram |
| SCL | TSLR | SCL "L" pulse width (Read) | 60 | -- | ns | -read command & data ram |
| D/CX | TDCS | D/CX setup time | 10 | -- | ns | - |
| D/CX | TDCH | D/CX hold time | 10 | -- | ns | - |
| SDA (DIN) | TSDS | Data setup time | 7 | -- | ns | - |
| SDA (DIN) | TSDH | Data hold time | 7 | -- | ns | - |
| DOUT | TACC | Access time | 10 | 50 | ns | For maximum CL=30pF For minimum CL=8pF |
| DOUT | TOH | Output disable time | 15 | 50 | ns | For maximum CL=30pF For minimum CL=8pF |
3.6 Electro-Optical Characteristics (Ta=25°C)
| Item | Symbol | Condition | Min. | Typ. | Max. | Unit | Remark |
|---|---|---|---|---|---|---|---|
| Response time | Tr + Tf | θx = θy =0 | -- | 30 | 40 | ms | Note 1 |
| Contrast Ratio | CR | θx = θy =0 | 1000 | 1200 | -- | -- | Note 2 |
| Transmittance | T% | θx = θy =0 | 4.25 | 5 | -- | % | -- |
| Color Chromaticity (CIE1931) White | W x, W y | θx = θy =0 | -- | (0.293, 0.335) | -- | -- | -- |
| Viewing angle (All directions) | θT, θB, θL, θR | CR > 10 | -- | 85 | -- | Deg. | Note 3 |
3.7 Design Notes from Documentation
- B/L Driver: The backlight driving condition is IF=80mA, Vf=3.0V (TYP) for 4 parallel LEDs.
- Mechanical: Tolerance of segments to edge of glass: ±0.2mm. The FPC includes PI reinforcement with a total thickness of 0.3mm (FPC+PI补强). Silver paste points are used for ESD protection.
- Housing: It is recommended that the housing visual area be at least 0.3mm smaller than the VA (Viewing Area) on each side. The housing foam window should be at least 0.6mm larger than the VA on each side. TP edge should not contact metal conductors to avoid ESD or short circuit risks.
- CTP Note: Pins 21-25 (TP_VCC, TP_SCL, TP_SDA, TP_RESET, TP_INT) are designated as "NC" (No Connection) in this standard module configuration.
- RoHS: RoHS compliance is expected.
4. Application Guidelines & Critical Notes
- Power Supply: The module requires a 2.8V (Typ.) power supply for VCC and 1.8V (Typ.) for IOVCC. Ensure the power supply ripple is minimized.
- Interface: This module supports SPI (4-Line Serial) and 8080 MCU 8-bit Parallel interface. The interface is selected via the IM1/2 pin (Pin 8). To use SPI, set Pin 8 to High; to use 8080 Parallel, set Pin 8 to Low (GND). The microcontroller must be configured for the selected protocol.
- Backlight Driver (External): An external constant current driver is required to supply a typical current of 80mA at a forward voltage of 3.0V.
- Reset: A hardware reset pin (RESET, Pin 1) is provided. A reset pulse must be applied to properly initialize the chip.
- Handling Precautions: Handle the module with care to avoid damage to the glass or FPC. Ground yourself to prevent electrostatic discharge (ESD).
5. Conclusion & Design-In Support
The LS19I03-SM-V1 from Lesson Smart Display Technology is a 1.9-inch TFT-LCD module with an IPS panel. It is a compact, high-quality solution suitable for a wide variety of embedded display applications requiring wide viewing angles and high contrast in a small form factor.
For successful design-in, engineers should:
- Obtain and review the complete, official Product Specification (Revision 1.0) for the full mechanical drawing and the ST7789T3 driver IC datasheet for detailed command initialization.
- Design a clean 2.8V/1.8V power supply and a backlight constant current driver circuit capable of delivering 80mA at 3.0V.
- Configure the host MCU's interface to match the selected protocol (SPI or 8080 Parallel) and 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.
