LSC024I20-M-V1: 2.4-Inch TFT LCD Module, 240×320 Resolution, MCU 8080 8/16-bit Interface, TN Transflective Display
Product Subtitle / Keywords
2.4 Inch Display, 240(RGB)x320 Resolution, 240 x RGB x 320 Dots, Transflective α-Si TFT LCD Module, TN (Twisted Nematic) Display Mode, 262K Display Colors, MCU8080-8bit / MCU8080-16bit Interface. ST7789T3-G4-1 Driver IC, View Direction 12:00 O'clock (Best image), Module Outline 40.22(H) ×57(V)×2.36(T) mm, Active Area 36.72(H)×48.96(V) mm, Operating Temperature -20~70°C, Storage Temperature -30~80°C, Life Time 13 Months, RoHS Compliant (Implied), Product Spec Revision A0, Lesson Smart Display Technology Co., Ltd.
1. Executive Summary & Product Positioning
The LSC024I20-M-V1, developed by Lesson Smart Display Technology Co., Ltd. (立信(万安)智显科技有限公司), is a trans-reflective type color active matrix TFT (Thin Film Transistor) liquid crystal display (LCD) that uses amorphous silicon TFT as a switching device. This module is composed of a TFT LCD module, a driver circuit, and a back-light unit. The resolution of a 2.4" display contains 240(RGB)x320 dots and can display up to 262K colors.
This product specification (Revision A0) serves as the definitive technical document, defining the module's general description, module parameters (including display size, LCD type, resolution, view direction, module outline, active area, display colors, interface, driver IC, operating/storage temperature, and life time), mechanical drawings, module interface pin definition (for the 38-pin FPC), application circuits (including backlight drive), absolute maximum ratings, electrical specifications (DC characteristics and current consumption), optical specifications (luminance, contrast ratio, response time, NTSC, viewing angles in reflective and transmissive modes), quality assurance (including sampling plan AQL 0.4 for major and 1.0 for minor defects, glass crack, chipping, FPC, polarizer, TP, and electrical defect criteria), reliability specifications (test conditions), and precautions and warranty information.
The document provides the core parameters necessary for system integration into standard 2.4-inch embedded display applications. The unequivocal recommendation for engineers is to strictly adhere to the mechanical and electrical specifications described herein to ensure reliable performance and compatibility.
2. Detailed Product Overview & Architecture
- Core Technology: Trans-reflective type color active matrix TFT (Thin Film Transistor) liquid crystal display (LCD) that uses amorphous silicon TFT as a switching device. This module is composed of a TFT LCD module, a driver circuit, and a back-light unit.
- Display Resolution: QVGA: 240(RGB) × 320 pixel array.
- Display Mode: Transflective TN (Twisted Nematic) with a view direction of 12:00 o'clock (best image). The trans-reflective design allows the display to be readable in both bright ambient light (reflective mode) and dark conditions (transmissive mode with backlight on).
- Display Colors: This panel can display up to 262K colors.
- Module Construction: TFT LCD Module + Driver Circuit + Back-light Unit. The module includes a glass cover (CG) and a capacitive touch panel (TP) interface.
- Interface Type: MCU 8080-8bit / MCU 8080-16bit parallel interface. This is a classic parallel interface commonly used with microcontrollers. The interface mode is selected by the IM0 pin (Pin 34): 0 for 80-8bit parallel, 1 for 80-16bit parallel.
- Power Architecture: Requires power supplies: VCC (2.8V Typ for Analog, Digital, and Booster), IOVCC (1.65V to 3.3V for I/O System), and TP_VCC (3.0V Typ for Touch Panel). The backlight is powered separately (LEDA/LEDK).
- Backlight: White LED backlight with a specified forward voltage VF=11.2~13.2V and forward current IF=20mA. The driving circuit must use a constant current circuit for every LED, with a recommended current between 3mA and 20mA for each LED.
- Touch Panel Interface: The module includes a 6-pin touch panel interface (GND, TP_VCC, TP_SCL, TP_SDA, TP_INT, TP_RST) using I²C communication.
- Driver IC: ST7789T3-G4-1.
- Supplier: 立信(万安)智显科技有限公司 (Lesson Smart Display Technology Co., Ltd).
3. Exhaustive Technical Specifications
3.1 Mechanical & Physical Specifications (Module Parameter)
| Features | Details | Unit |
|---|---|---|
| Display Size (Diagonal) | 2.4 | inch |
| LCD type | α-Si TFT | - |
| Display Mode | TN / trans-reflective | - |
| Resolution | 240RGB x 320 | - |
| View Direction | 12:00 o'clock (Best image) | - |
| Module Outline (Note 1) | 40.22(H) ×57(V)×2.36(T) | mm |
| Active Area | 36.72(H)×48.96(V) | mm |
| TP/CG outline | 45.6 (H) ×70.51(V)×4.21(T) | mm |
| Display Colors | 262K | - |
| Interface | MCU8080-8bit / MCU8080-16bit | - |
| Driver IC | ST7789T3-G4-1 | - |
| Operating Temperature | -20~70 | °C |
| Storage Temperature | -30~80 | °C |
| Life Time | 13 | Months |
| Weight | TBD | g |
Note 1: Excluding hooks, posts, FPC/FPC tail etc.
3.2 Interface & Electrical Specifications
3.2.1 Absolute Maximum Ratings (From Section 6)
Condition: VSS=0V, Ta=25°C
| Item | Item | Symbol | Min. | Max. | Unit |
|---|---|---|---|---|---|
| Analog Supply Voltage | Display IC | VCC | -0.3 | +4.6 | V |
| Analog Supply Voltage | Touch IC | TP VCC | -0.3 | +3.6 | V |
| Logic Supply Voltage | Display IC | IOVCC | -0.3 | +4.6 | V |
| Logic Output Voltage | Display IC | Vout | -0.3 | IOVCC+0.3 | V |
| Logic Output Voltage | Touch IC | Vout | -0.3 | 3.3+0.3 | V |
3.2.2 DC Characteristics (From Section 7)
| Item | Item | Symbol | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| Analog Supply Voltage | Display IC | VCC | 2.5 | 2.8 | 3.3 | V |
| Analog Supply Voltage | Touch IC | TP VCC | 2.8 | 3.0 | 3.6 | V |
| Logic Supply Voltage | Display IC | IOVCC | 1.65 | 2.8 | 3.3 | V |
| Logic Low input voltage | - | VIL | VSS | - | 0.3 IOVCC | V |
| Logic High input voltage | - | VIH | 0.7 IOVCC | - | IOVCC | V |
| Logic Low output voltage | - | VOL | VSS | - | 0.2 IOVCC | V |
| Logic High output voltage | - | VOH | 0.8 IOVCC | - | IOVCC | V |
| Current Consumption (Display) | Normal display | Ivdd | - | 7.5 | - | mA |
| Current Consumption (Display) | Standby mode | Ivdd | - | 30 | - | uA |
| Current Consumption (Touch) | Dynamic Mode | Ivdd | - | 10 | - | mA |
| Current Consumption (Touch) | Standby mode | Ivdd | - | 20 | - | uA |
| Frame Frequency | - | fFR | - | 60 | - | Hz |
3.2.3 Backlight Driving Conditions
The backlight circuit diagram recommends using a constant current circuit for each LED. The recommended current for each LED is between 3mA and 20mA. The forward voltage (VF) is 11.2~13.2V. The typical IF is 20mA. The designer must ensure that the LED lamp current is less than 20mA to avoid dim lights and reduced lifespan.
3.2.4 Pin Description (38-Pin FPC Interface, From Section 4)
The module uses a 38-pin FPC connector. Key signals include:
| NO | SYMBOL | FUNCTION |
|---|---|---|
| 1 | LCM_ID | NC |
| 2 | GND | Power Ground |
| 3 | IOVCC | Power Supply for I/O System. |
| 4 | VCC | Power Supply for Analog, Digital System and Booster Circuit. |
| 5 | FMARK | Tearing effect signal. Used to synchronize MCU to frame memory writing. If not used, please let this pin open. |
| 6 | CS | Chip selection pin. Low enable. |
| 7 | DC | Display data/command selection pin in parallel interface. |
| 8 | WR | Write enable in MCU parallel interface. |
| 9 | RD | Read enable in 8080 MCU parallel interface. |
| 10~25 | DB0~DB15 | 16-bit I/F: DB[15:0] are used. |
| 26 | RESET | This signal will reset the device. Signal is active low. |
| 27 | GND | Power Ground |
| 28~29 | LEDA | LED Anode |
| 30~31 | LEDK | LED Cathode |
| 32 | TP-GND | Ground. |
| 33 | TP-VCC | Power Supply for TP, IOVCC=2.4V~3.3V. |
| 34 | IM0 | The MCU interface mode select. 0: 80-8bit parallel I/F 1: 80-16bit parallel I/F |
| 35 | GND | Power Ground |
| 36 | TP-SCL | I²C clock signal of Touch Panel; |
| 37 | TP-SDA | I²C data signal of Touch Panel; |
| 38 | TP-INT | Interrupt signal to main processor of Touch Panel; |
3.3 Optical Characteristics (From Section 11)
3.3.1 Transmissive Mode
Condition: Ta=25°C, VDD=2.8V (Transmissive)
| Item | Item | Symbol | Condition | Min. | Typ. | Max. |
|---|---|---|---|---|---|---|
| Luminance on surface | (If=20mA) | Lv | Normally viewing angle θx=θy=0° | - | 100 | - |
| Contrast ratio | - | CR | Normally viewing angle θx=θy=0° | - | 45:1 | - |
| Response time | - | TR+TF | Normally viewing angle θx=θy=0° | - | - | 30 |
| Chromaticity (Red) | - | XR | - | 0.371 | 0.403 | 0.431 |
| Chromaticity (Red) | - | YR | - | 0.258 | 0.287 | 0.318 |
| Chromaticity (Green) | - | XG | - | 0.292 | 0.325 | 0.352 |
| NTSC | - | - | - | - | 14 | - |
3.3.2 Reflective Mode
Condition: Ta=25°C, VDD=2.8V (Reflective)
| Item | Item | Symbol | Condition | Min. | Typ. | Max. |
|---|---|---|---|---|---|---|
| Contrast ratio | - | CR | - | - | 9:1 | - |
| Response time | - | TR+TF | - | - | - | 30 |
| Viewing Angle (Horizontal θx+ ) | - | θx+ | Center CR≥2 | 50 | 60 | - |
| Viewing Angle (Horizontal θx- ) | - | θx- | Center CR≥2 | 50 | 60 | - |
| Viewing Angle (Vertical θY+ ) | - | θY+ | Center CR≥2 | 50 | 60 | - |
| Viewing Angle (Vertical θY- ) | - | θY- | Center CR≥2 | 50 | 60 | - |
| NTSC | - | - | - | - | 2.7 | - |
| Reflective (SCE) | - | T | - | - | 7.8 | - |
3.4 Reliability Test Conditions (From Section 13)
The specification defines Reliability Conditions for the module. Key tests include (but are not limited to) the following, with the condition that no defect is allowed after testing:
- High Temperature Storage
- Low Temperature Storage
- High Temperature Operation
- Low Temperature Operation
- High Temperature and High Humidity Storage
- Thermal Shock
- ESD Test (Applied to LCD glass panel, not other areas. IDD should be within twice initial value. If malfunction is recovered after resetting, it would be judged as a good part.)
3.4.1 Quality Assurance (From Section 12)
The sampling plan follows GB/T2828.1-2012/ISO 2859-1: 1999 and ANSI/ASQC Z1.4-1993, normal level 2.
- Major defect: AQL 0.4
- Minor defect: AQL 1.0
Detailed inspection criteria are provided for various defects including glass crack, chipping, burr, FPC defects, screen deformation, polarizer bubbles/dents, bezel, touch panel spots/dents/scratches, PCB, soldering (IPC-A-610C), and electrical defects (e.g., missing segment, abnormal display, no function, current exceed spec, backlight/Touch Panel failure).
4. Application Guidelines & Critical Notes
Intended Use
- Standard 2.4-inch display for embedded systems, IoT devices, and handheld instruments.
- Applications requiring a transflective display for good sunlight readability.
- Systems utilizing an MCU with a parallel 8080 interface.
Critical Design Considerations
- Triple Power Supply (VCC=2.8V, IOVCC=2.8V, TP_VCC=3.0V): The module requires three separate power rails. VCC powers the core analog/digital circuits. IOVCC powers the I/O interface. TP_VCC powers the touch sensor. Typical voltages are 2.8V for the display and 3.0V for the touch panel, but each has a wider range.
- MCU 8080 Parallel Interface (8-bit/16-bit selectable): The module uses a classic MCU 8080 parallel interface. The IM0 pin (Pin 34) selects the bus width. This is a critical configuration. The interface uses CS (Chip Select), DC (Data/Command), WR (Write), RD (Read), and DB[15:0] (Data Bus). DB[15:0] are used for 16-bit mode, while DB[7:0] are used for 8-bit mode.
- External Backlight Driver (Constant Current, 20mA per string): The backlight requires an external constant current source. The LED forward voltage is 11.2~13.2V (Typ). The recommended current per LED is 3mA to 20mA (Typ 20mA). Dim lights and reduced lifespan can occur if the range is exceeded. The backlight has two LEDA (anode) and two LEDK (cathode) pins (pins 28-31), suggesting multiple LED strings.
- I²C Touch Panel Interface: The integrated touch panel uses an I²C interface (TP-SCL, TP-SDA) with an interrupt output (TP-INT) and a reset pin (TP-RST, though not explicitly in the pin list for the main connector, the touch interface definition mentions it). The host must initialize and communicate with the touch controller over I²C.
- No Defect Allowed After Reliability Tests: The reliability specification (Note 2) states that no defect is allowed after testing. This is a critical consideration for validating the module in high-reliability applications.
- Limited Lifetime (13 Months): The module has a specified lifetime of 13 months. This is unusually short and likely refers to the storage shelf life before use. The warranty (14.5) limits liability to repair/replacement and suggests using all modules within six months. If storage time exceeds 12 months, rechecking is suggested before use.
- Transflective Display (TN Mode): The trans-reflective design is excellent for outdoor/sunlight readability. However, the reflective mode has a very low contrast ratio (9:1 Typ vs 45:1 Typ for Transmissive) and a very low NTSC color gamut (2.7% Typ vs 14% Typ). The color performance is significantly degraded in reflective mode.
- 12 O'clock View Direction: The display has the best image quality when viewed from the 12 o'clock direction (i.e., from above the center of the display). Ensure the mechanical mounting considers this orientation.
- Handling Precautions: The liquid crystal in the LCD is poisonous. Avoid contact with mouth, skin, or clothes. The glass cells are fragile; do not apply strong impact. The document specifies static electricity precautions.
- Inspection Criteria for Cosmetic Defects: The specification provides detailed quality inspection criteria for glass, polarizer, and touch panel defects (bubbles, dents, scratches, spots). This is critical for incoming quality control (IQC).
Handling & Compliance
- Observe standard ESD precautions during handling and assembly.
- The module contains fragile glass – handle with care. Avoid mechanical stress on the active area or FPC.
- Do not apply strong impact on the liquid crystal cells.
- The liquid crystal is poisonous. Wash immediately with soap and water if contact occurs.
- The document recommends using all modules within six months of delivery. Recheck modules stored over 12 months.
- RRJ-DISPLAY's warranty is limited to repair/replacement of the module itself and does not cover consequential loss.
- For standard products, the manufacturer reserves the right to change materials/processes without notice. For OEM products, changes will be consulted with the customer.
5. Conclusion & Design-In Support
The LSC024I20-M-V1 specification details a classic, well-documented 2.4-inch QVGA (240×320) transflective TN TFT LCD module with an MCU 8080 parallel interface, integrated touch panel, and dual operation modes (transmissive/reflective) — a suitable choice for embedded systems requiring a cost-effective, easily-interfaced display with good sunlight readability.
Key Strengths
- Standard QVGA Resolution (240×320) with MCU 8080 Interface: Easy to interface with 8/16-bit microcontrollers without complex timing controllers.
- Transflective Technology: Excellent readability in bright ambient sunlight (outdoor use) while retaining a backlight for indoor/dark conditions.
- Integrated Touch Panel with I²C Interface: Simplifies system design by providing a complete display+touch solution.
- Compact 2.4-inch Form Factor: Suitable for space-constrained designs.
- Wide Temperature Range (-20°C to +70°C): Suitable for standard industrial and consumer applications.
- Comprehensive Pinout and Electrical Specifications: Detailed pin descriptions, absolute maximum ratings, and DC characteristics enable straightforward system integration.
Main Design Focus
- The critical design tasks are providing triple power supplies (VCC=2.8V for core, IOVCC=2.8V for I/O, TP_VCC=3.0V for touch), implementing the MCU 8080 parallel interface (8-bit or 16-bit via IM0 pin) with correct timing for CS, DC, WR, RD, and data bus, designing a constant-current LED backlight driver (20mA at ~12V Typ) with PWM dimming capability via an external transistor/PWM signal, and initializing and communicating with the I²C touch panel controller (TP-SCL, TP-SDA, TP-INT).
- Supporting requirements: Connect all ground pins. Implement the RESET signal for the driver IC (active low pulse). Correctly tie the IM0 pin to select the desired interface mode (8-bit or 16-bit). Use the FMARK pin from the timing controller for frame synchronization (or leave it open if not needed). Ensure the mechanical design accommodates the module outline (40.22mm × 57mm × 2.36mm) and the FPC connector orientation.
This module is a straightforward and reliable choice for engineers designing cost-sensitive embedded display systems that need a simple MCU interface and good sunlight readability, using a well-established TN transflective technology.
