LSR043T09-R-V1 (ST7282A): 4.3-inch TFT LCD Module, 480×272, RGB Interface, 262k Colors, Transmissive IPS
Product Subtitle / Keywords
4.3 Inch Display, 480(RGB)×272 Resolution, Transmissive a-Si TFT-LCD Module, COG+FPC+B/L+RTP Module Type, RGB 24-bit Interface, 262K Colors, Main LCD Driver: ST7282A, IPS Display Mode (ALL View), Module Size: 105.5 × 67.2 × 4.40 mm (With RTP), Active Area: 95.04 × 53.856 mm, Operating Temp: -20°C ~ +70°C, Storage Temp: -30°C ~ +80°C, Backlight: 7 Chip-White LED (Series), Vf=21.0V, If=20mA, Module Luminance: 200 cd/m² (Typ.), with Resistive Touch Panel (RTP), RoHS Compliant, Product Revision 1.0
1. Executive Summary And Product Positioning
The LSR043T09-R-V1 is a 4.3-inch diagonal transmissive type a-Si TFT-LCD (amorphous silicon thin film transistor liquid crystal display) module, manufactured by Lesson (Wanan) Smart Display Technology Co., Ltd. This comprehensive module is a complete, ready-to-use visual and touch interface solution, integrating a TFT-LCD panel, a driver circuit, a backlight unit (B/L), and a resistive touch panel (RTP) into a compact and robust package. The product specification (Revision 1.0) serves as the definitive technical document for this module.
This module is characterized by its moderate-sized display and integrated touch functionality in a 4.3-inch form factor, a classic size for industrial and embedded applications. It features a resolution of 480(RGB)×272 pixels, which is WQVGA, and is capable of displaying up to 262k colors, which corresponds to 6-bit color depth per primary color (Red, Green, Blue). This ensures smooth color gradients and detailed imagery suitable for advanced graphical user interfaces. The inclusion of an RTP (Resistive Touch Panel) provides a durable and cost-effective touch input solution.
The unequivocal recommendation for engineers is to strictly adhere to the absolute maximum ratings, electrical specifications, and interface timing described herein to ensure reliable performance and compatibility within the intended application. Failure to operate within these limits can lead to permanent damage, degraded optical performance, or reduced product lifespan.
2. Detailed Product Overview And Architecture
The LSR043T09-R-V1 is engineered for devices that demand a clear, vibrant display with a rugged touch input capability, such as industrial HMIs, handheld terminals, and test & measurement equipment. Its architecture is built around several key technologies and design choices:
- Core Technology: Transmissive type a-Si TFT-LCD with IPS (In-Plane Switching) display mode, providing free viewing direction (grayscale inversion). This technology offers superior color reproduction and wide viewing angles. As a transmissive display, it requires a backlight to be visible.
- Module Type: COG (Chip-On-Glass) + FPC (Flexible Printed Circuit) + B/L (Backlight) + RTP (Resistive Touch Panel). The driver IC (ST7282A) is directly mounted onto the LCD glass (COG), minimizing size and interconnect complexity. The FPC provides a flexible connection to the host system. The RTP provides a durable and cost-effective touch input solution, responding to pressure from any object (finger, stylus, gloved hand).
- Display Format: Graphic 480(RGB)×272 Dot-matrix (WQVGA). This widescreen resolution is ideal for graphical interfaces, video playback, and displaying detailed information.
- Display Characteristics: Capable of displaying up to 262k colors. This refers to 6-bit color depth per primary color (R, G, B), allowing the module to generate 262,144 distinct colors.
- Interface Type: The module utilizes a standard RGB Parallel Interface (24-bit color data lines: R0-R7, G0-G7, B0-B7) along with synchronization signals (VSYNC, HSYNC, DE, CLK). This interface is common on many microcontrollers and application processors.
- Main LCD Driver IC: The module integrates the ST7282A driver IC. This specific IC is designed to drive the TFT matrix and handle the RGB interface commands.
- Backlight Unit: The module utilizes a white LED backlight comprised of 7 chips connected in series (串联). The specified driving condition is IF=20mA and Vf (Typ.)=21.0V.
- Special Features: IPS technology for wide viewing angles (Free Direction), WQVGA resolution, integrated 4-wire resistive touch panel (RTP), 262K color capability, wide operating temperature range (-20°C to +70°C), and compliant with the RoHS directive. The module includes specific mechanical design recommendations for the case and foam.
- Approval Status: Approved Product Specification only (Revision 1.0).
3. Exhaustive Technical Specifications
3.1 General & Mechanical Specification
This section provides the physical dimensions and other key general parameters of the module.
| Parameter | Specification | Unit |
|---|---|---|
| Panel Size | 4.3'' (Diagonal) | Inch |
| Module Size (H×V×D) | 105.5 × 67.2 × 4.40 | mm |
| Active Area (H×V) | 95.04 × 53.856 | mm |
| Number of Dots | 480(RGB) × 272 | pixels |
| Display Type | Active matrix TFT, Transmissive, IPS (Free Viewing Direction) | - |
| Display Colors | 262K | colors |
| Module Type | COG+FPC+B/L+RTP | - |
| Main LCD Driver IC | ST7282A | - |
| Input Data | RGB | - |
| View Direction (Grayscale Inversion) | Free (IPS) | - |
| Touch Panel Type | 4-wire Resistive (RTP) | - |
3.2 Absolute Maximum Ratings
The absolute maximum ratings are stress limits. Operating the module at or beyond these values can result in irreversible damage.
| Item | Symbol | Min | Max | Unit | Remark |
|---|---|---|---|---|---|
| Supply voltage | VCC | -0.3 | 3.3 | V | Note1, Note2 |
| Supply voltage (I/O) | IOVCC | -0.3 | 3.3 | V | Note1, Note2 |
| Operating temperature | TOPR | -20 | 70 | °C | Note1, Note2 |
| Storage temperature | TSTR | -30 | 80 | °C | Note1, Note2 |
| Storage Humidity | HSTR | 10 | 90 | %RH | Note1, Note2 |
| Operating Ambient Humidity | HOPR | 10 | 90 | %RH | Note1, Note2 |
Note1: Exceeding these values may cause permanent damage.
Note2: All voltages are referenced to GND.
3.3 DC Characteristics (Typical Operating Conditions)
These are the recommended operating conditions for the module. The module requires a single 3.3V power supply.
| Item | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply voltage | VCC | - | 3.3 | - | V |
| Supply voltage (I/O) | IOVCC | - | 3.3 | - | V |
| Input Voltage (L level) | VIL | 0 | - | 0.2*IOVCC | V |
| Input Voltage (H level) | VIH | 0.8*VCC | - | IOVCC | V |
3.4 Backlight Driving Conditions
The module uses a white LED backlight composed of 7 chips connected in series (串联). The driving condition is: IF=20mA, Vf (Typ.)=21.0V. A constant current source is strongly recommended for driving the backlight to ensure consistent brightness and longevity.
| Parameter | Symbol | Typ | Unit |
|---|---|---|---|
| Forward Voltage (LED String) | VF | 21.0 | V |
| Forward Current (LED String) | If | 20 | mA |
3.5 Interface Connection (40-Pin FPC)
The module uses a 40-pin FPC connector. The interface includes RGB data lines (R0-R7, G0-G7, B0-B7), synchronization signals (VSYNC, HSYNC, CLK, DE), power (VCC, GND), backlight power (LED-A, LED-K), and resistive touch panel (RTP) pins (XR, XL, YU, YD). Note that pin 31 (DISP) is an NC pin, as the display is internally pulled high for always-on operation.
| PIN NO. | Symbol | I/O | Description |
|---|---|---|---|
| 1 | LED-K | P | LED Backlight, Cathode. |
| 2 | LED-A | P | LED Backlight, Anode. |
| 3 | GND | P | Ground |
| 4 | VCC | P | Power Supply |
| 5-12 | R0-R7 | I | Red Data (R0=LSB, R7=MSB) |
| 13-20 | G0-G7 | I | Green Data (G0=LSB, G7=MSB) |
| 21-28 | B0-B7 | I | Blue Data (B0=LSB, B7=MSB) |
| 29 | GND | P | Ground |
| 30 | CLK | I | Clock Signal (DCLK). Frequency: 9MHz (Typ.) |
| 31 | DISP (NC) | I | Display ON/OFF. Internally pulled high (NC), display is always ON. |
| 32 | HSYNC | I | Horizontal Sync Input (in RGB mode) |
| 33 | VSYNC | I | Vertical Sync Input (in RGB mode) |
| 34 | DE | I | Data Enable Input (in RGB mode) |
| 35 | NC | - | Not Connected |
| 36 | GND | P | Ground |
| 37 | XR | I | Touch Plane Pin (X-Right) |
| 38 | YD | I | Touch Plane Pin (Y-Down) |
| 39 | XL | I | Touch Plane Pin (X-Left) |
| 40 | YU | I | Touch Plane Pin (Y-Up) |
3.6 Timing Characteristics (RGB Interface)
The module operates in sync mode (Tvbp=12, Thbp=43). The typical DCLK frequency is 9MHz.
| Item | Symbol | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| DCLK Frequency | Fclk | 8 | 9 | 12 | MHz |
| HSYNC Period Time | Th | 487 | 531 | 598 | DCLK |
| VSYNC Period Time | Tv | 276 | 292 | 321 | H |
4. Application Scenario
The LSR043T09-R-V1 is a robust and reliable display module with an integrated resistive touch panel, making it an ideal choice for any embedded system that requires a clear visual output and a durable touch input interface. Its 4.3-inch diagonal size with a 480x272 resolution provides a ample canvas for graphical content, menus, and data visualization. The 262K color capability ensures a pleasant user experience. The included RTP provides a cost-effective and durable touch solution that works with gloved fingers or any stylus, making it ideal for industrial environments.
Key application areas are numerous and diverse:
- Industrial Human-Machine Interfaces (HMIs): Control panels for machinery, factory automation, and process control. The RTP allows for use even with gloves.
- Handheld Instruments: Multimeters, signal generators, oscilloscopes, and other portable test equipment.
- Point-of-Sale (POS) Terminals: Customer-facing payment terminals and order-entry systems.
- Medical Devices: Patient monitors, diagnostic equipment, and infusion pumps where durability and hygiene are important.
- Smart Home & Building Control: Thermostats, security system keypads, and intercom systems.
The module's RGB interface is standard for many microcontrollers and application processors. The IPS technology ensures excellent image consistency when viewed from any angle. The manufacturer provides specific mechanical design guidelines: the case visual area should be smaller than the VAmds (Viewing Area) by more than 0.3mm per side, and the foam opening for the case should be larger than the VAmds by more than 0.6mm per side. It is also recommended that the TP edge does not contact any metal conductor.
5. Handling Precautions And Compliance
The LCD panel is made of glass and is fragile. The polarizer surface is easily scratched. The module should be handled with care to avoid applying pressure on the display area, especially the back of the LCD. ESD (Electrostatic Discharge) protection is mandatory throughout handling, assembly, and testing. Use grounded wrist straps, conductive work surfaces, and anti-static packaging. The FPC is also delicate; avoid sharp bends at the connector interface.
The RTP is a glass-based component covered by a film. Do not apply excessive pressure or sharp objects to the touch panel surface. The TP edge should not contact any metal conductor to prevent false touches or electrical shorts.
The module should be stored in a clean, dry environment away from direct sunlight, high temperatures, and corrosive gases. The recommended storage temperature is -30°C to 80°C. It is strongly recommended to use the module within six months of manufacturing.
It is strongly recommended to read the full specification document (LSR043T09-R-V1 Product Specification Revision 1.0) before integration and to test the module under application-specific conditions. The manufacturer disclaims liability for damages resulting from improper use, modification, or failure to follow these guidelines.
The product is compliant with the RoHS (Restriction of Hazardous Substances) directive. Proper waste disposal according to local regulations is recommended at the end of the product's lifecycle.
