LSR043T04-R-V1 | 4.3 inch TFT-LCD Module | 480x272 | RGB 24-bit | TN | Resistive Touch
Product Keywords: 4.3″ TFT LCD Module, COG+FPC+B/L+RTP, 480(RGB)×272 Resolution, 16.7M Colors, TN Viewing Direction (12 O'Clock), NV3047E Driver IC, 24-bit RGB Interface, 4-Wire Resistive Touch Panel, Transmissive a-Si TFT, 380 cd/m² Luminance, 700:1 Contrast Ratio, -20°C to +70°C Operation.
1. Executive Summary & Product Positioning
The LSR043T04-R-V1 is a 4.3-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, a backlight unit, and an integrated 4-wire resistive touch panel. The panel size is 4.3 inch and the resolution is 480(RGB)*272, the panel can display up to 16.7M colors.
Product Positioning: Designed for a wide range of embedded and industrial applications requiring a medium-resolution color display with touch input. Typical uses include smart home control panels, portable instruments, point-of-sale terminals, and other human-machine interface (HMI) systems where cost-effectiveness and reliable touch interaction are essential.
2. Detailed Product Overview & Architecture
The module's architecture is designed for robust performance and easy integration. The primary components include:
- TFT-LCD Panel: 4.3-inch diagonal, a-Si TFT active matrix, transmissive, TN (Twisted Nematic) normally white mode. Resolution is 480(RGB) × 272 pixels with an active area of 95.04 × 53.856 mm.
- Driver IC: The module uses the NV3047E driver IC, which supports a 24-bit RGB parallel interface.
- Backlight Unit (B/L): A white LED backlight unit with 7 chips in series. The typical driving condition is IF=20mA, VF=21V (total), but the module specifies a typical luminance of 380 cd/m² at IF=40mA.
- Mechanical Construction: COG (Chip-on-Glass) + FPC + B/L + RTP (Resistive Touch Panel). The module outline dimensions are 105.5 (H) × 67.2 (V) × 6.7 (D) mm (including touch panel and backlight).
- Interface: The module communicates via a 40-pin FPC connector. The display interface is 24-bit RGB parallel (8 bits per color).
- Touch Panel: Integrated 4-wire resistive touch panel with dedicated pins (XR, YD, XL, YU).
3. Exhaustive Technical Specifications
3.1 General & Mechanical Specifications
| Item | Specification |
| Display Size (Diagonal) | 4.3 inches |
| Resolution (Dots) | 480(RGB) × 272 |
| Display Technology | Active Matrix TFT, Transmissive, a-Si |
| Module Construction | COG+FPC+B/L+RTP |
| Color Depth | 16.7M Colors (24-bit RGB) |
| Viewing Direction (Grayscale Inversion) | TN (12 O'Clock) |
| Input Data Interface | 24-bit RGB Parallel |
| Driver IC | NV3047E |
| Active Area (H×V) | 95.04 × 53.856 mm |
| Module Size (H×V×D) | 105.5 × 67.2 × 6.7 mm (max) |
| Pixel Pitch | 0.066 (H) × 0.198 (V) mm |
| Pixel Arrangement | RGB Vertical Stripe |
| Display Mode | Normally White |
| Color Gamut | 50% (Typ.) |
| Operating Temperature | -20°C to +70°C |
| Storage Temperature | -30°C to +80°C |
3.2 Absolute Maximum Ratings
Stress beyond those listed may cause permanent damage.
| Parameter | Symbol | Min | Max | Unit |
|---|---|---|---|---|
| Supply voltage (VCC) | VCC | -0.3 | 4.6 | V |
| Supply voltage (IOVCC) | IOVCC | -0.3 | 4.6 | V |
| Operating temperature | TOPR | -20 | 70 | °C |
| Storage temperature | TSTR | -30 | 80 | °C |
3.3 Electrical Characteristics (Ta=25°C)
3.3.1 Recommended Operating Conditions
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply voltage | VCC | 3.0 | 3.3 | 3.6 | V |
| I/O supply voltage | IOVCC | 1.65 | -- | VCC | V |
| Input voltage (Low level) | VIL | 0 | -- | 0.3*IOVCC | V |
| Input voltage (High level) | VIH | 0.7*IOVCC | -- | IOVCC | V |
3.3.2 Backlight LED Characteristics (IF=40mA per string, typical circuit: 7 LEDs in series)
| Parameter | Symbol | Typ | Unit |
|---|---|---|---|
| Forward Voltage (Total) | VF | 21 | V |
| Forward Current | IF | 20 | mA |
| Luminance (at IF=40mA) | L | 380 | cd/m² |
3.4 Interface Pin Assignment (40-Pin FPC)
| Pin No. | Symbol | I/O | Description |
|---|---|---|---|
| 1 | LEDK | P | Backlight power supply negative |
| 2 | LEDA | P | Backlight power supply positive |
| 3 | GND | P | Ground |
| 4 | VCC | P | Power supply |
| 5-12 | R0-R7 | I | Red Data (8 bits) |
| 13-20 | G0-G7 | I | Green Data (8 bits) |
| 21-28 | B0-B7 | I | Blue Data (8 bits) |
| 29 | GND | P | Ground |
| 30 | CLK | I | Clock signal |
| 31 | DISP | I | Display on/off |
| 32 | HS | I | Horizontal sync input (short to GND if not used) |
| 33 | VS | I | Vertical sync input (short to GND if not used) |
| 34 | DE | I | Data enable |
| 35 | NC | -- | No Connection |
| 36 | GND | P | Ground |
| 37 | XR | I | Touch panel X-right |
| 38 | YD | I | Touch panel Y-bottom |
| 39 | XL | I | Touch panel X-left |
| 40 | YU | I | Touch panel Y-up |
3.5 Timing Characteristics (RGB Mode)
| Item | Symbol | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| DCLK Frequency | Fclk | 8 | 9 | 12 | MHz |
| DCLK Period | Tclk | 83 | 111 | 125 | ns |
| Frame Rate | FR | -- | -- | 75 | Hz |
| Line Period | Tlp | 24 | -- | -- | us |
| HSYNC Period | Th | -- | 531 | -- | DCLK |
| HSYNC Display Period | Thdisp | -- | 480 | -- | DCLK |
| HSYNC Back Porch | Thbp | -- | 43 | -- | DCLK |
| HSYNC Front Porch | Thfp | -- | 8 | -- | DCLK |
| HSYNC Pulse Width | Thw | -- | 4 | -- | DCLK |
| VSYNC Period | Tv | -- | 292 | -- | H |
| VSYNC Display Period | Tvdisp | -- | 272 | -- | H |
| VSYNC Back Porch | Tvbp | -- | 12 | -- | H |
| VSYNC Front Porch | Tvfp | -- | 8 | -- | H |
| VSYNC Pulse Width | Tvw | -- | 4 | -- | H |
Note: In sync mode, it is necessary to keep Tvbp = 12, Tvfp = 8, Tvw = 4, Thbp = 43, Thfp = 8, Thw = 4. Thbp must be >10 and Tvbp+Tvfp < 128.
3.6 Power ON/OFF Sequence
The power sequence must be strictly followed to prevent damage to the module.
3.6.1 Power On Sequence
| Symbol | Description | Min. Time | Unit |
|---|---|---|---|
| T0 | Determined by the external power | 0 | ms |
| T1 | Time from stable VDD, VDDI, PVDD set-up to DISP | 0 | ms |
| T2 | Time from DISP="High" to the first VSYNC | 0 | ms |
| T3 | Display Signal output to Backlight Power on | 15 * Frame | ms |
3.6.2 Power Off Sequence
| Symbol | Description | Min. Time | Unit |
|---|---|---|---|
| T0 | Backlight power off to DISP="Low" | 5 | ms |
| T1 | DISP="Low" to IC internal voltage discharge complete | 6 * Frame | ms |
3.7 Optical Characteristics (Ta=25°C)
| Item | Symbol | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Response Time (Tr+Tf) | Tr+Tf | θx = θy = 0° | -- | 20 | 30 | ms |
| Contrast Ratio | CR | θx = θy = 0° | 500 | 700 | -- | -- |
| Transmittance | T% | θx = θy = 0° | -- | 6.85 | -- | % |
| Color Chromaticity (CIE1931) White | Wx, Wy | θx = θy = 0° | -- | (0.301, 0.337) | -- | -- |
| Viewing Angle (Top) | θT | CR > 10 | -- | 80 | -- | Deg. |
| Viewing Angle (Bottom) | θB | CR > 10 | -- | 80 | -- | Deg. |
| Viewing Angle (Left) | θL | CR > 10 | -- | 60 | -- | Deg. |
| Viewing Angle (Right) | θR | CR > 10 | -- | 70 | -- | Deg. |
| Luminance (IF=40mA) | L | θx = θy = 0° | -- | 380 | -- | cd/m² |
4. Application Guidelines & Critical Notes
- Power Supply: The module requires a single 3.3V (Typ.) power supply for VCC. The I/O voltage (IOVCC) can range from 1.65V to VCC. Ensure the power supply ripple is kept within limits.
- RGB Parallel Interface: The 24-bit RGB interface must be carefully routed on the PCB to minimize skew between data, clock, and control signals. The clock frequency is up to 12 MHz. The HS, VS, and DE signals should be used according to the timing table. If not used, HS and VS should be shorted to GND.
- Backlight Driver (External): The module provides LEDA (anode) and LEDK (cathode) pins. An external constant current driver is required. The typical forward voltage is 21V and the current is 20mA (note that the luminance specification of 380 cd/m² is given at 40mA, which may require adjusting the current or confirming the circuit design). The backlight circuit diagram shows a series-connected LED string.
- Touch Panel (RTP): The 4-wire resistive touch pins (XR, YD, XL, YU) provide the raw analog touch coordinates. These must be read by an external touch controller (ADC) on the main board. The touch panel edge must not contact any metal conductor.
- Mechanical Integration: The module outline drawing includes critical dimensions. Important notes from the manufacturer include:
- The viewing area opening in the enclosure should be 0.5mm larger than the LCM active area per side.
- A foam gasket is recommended around the perimeter for environmental sealing.
- The module thickness is 6.7mm max including backlight and touch panel.
- The storage and operating temperature ranges are -30°C to +80°C and -20°C to +70°C respectively. Avoid condensation.
- Power Sequence: Strictly follow the Power ON/OFF sequence. The display must be active (VSYNC running) before the backlight is turned on (T3 ≥ 15 frames). During power off, the backlight must be turned off before DISP goes low (T0 ≥ 5ms).
- Handling Precautions: Handle the module with care to avoid damage to the glass or FPC. Ground yourself to prevent electrostatic discharge (ESD). Do not press the display surface with sharp objects.
5. Conclusion & Design-In Support
The LSR043T04-R-V1 from Lesson Smart Display Technology is a well-rounded 4.3-inch TFT-LCD module that combines a standard RGB parallel interface with an integrated resistive touch panel. Its moderate resolution (480×272), good brightness (380 cd/m²) and contrast (700:1), and wide operating temperature range make it a versatile choice for many industrial and consumer applications.
For successful design-in, engineers should:
- Obtain and review the complete Product Specification (Revision 1.0) for the full mechanical drawing, detailed timing diagrams, and all characteristic notes.
- Design a clean 3.3V power supply and a backlight constant current driver circuit capable of delivering 40mA at about 21V (adjust based on actual luminance requirement).
- Implement the RGB interface according to the specified timing (DCLK up to 12 MHz, sync pulse widths, porch values).
- Connect the resistive touch panel pins to a suitable analog-to-digital converter (ADC) or a dedicated touch controller IC.
- 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, clear, and cost-effective display solution for a wide array of embedded systems.
