LSR043T04-R-V2 | 4.3 inch TFT-LCD Module | 480x272 | RGB 24-bit | TN | Resistive Touch
1. Executive Summary & Product Positioning
The LSR043T04-R-V2 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). The module specifies a typical luminance of 500 cd/m² at IF=40mA.
- Mechanical Construction: COG (Chip-on-Glass) + FPC + B/L + RTP (Resistive Touch Panel). The panel size is 100.16 × 61.856 mm (excluding FPC and touch panel flex).
- 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).
- Viewing Direction: TN (12 O'Clock).
- Color Gamut: 50% (Typ).
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 |
| CF Size (H×V) | 100.16 × 58.556 mm |
| Panel Size (H×V) | 100.16 × 61.856 mm |
| 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 (Ta=25°C)
Stress beyond those listed may cause permanent damage.
| Parameter | Symbol | Min | Max | Unit | Remark |
|---|---|---|---|---|---|
| Supply voltage (VCC) | 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 |
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
The circuit diagram shows a series of 7 White LED chips. The typical driving current is 20mA. Luminance of 500 cd/m² is specified at IF=40mA.
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Forward Voltage (Total) | VF | -- | 21 | -- | V |
| Forward Current | IF | -- | 20 | -- | mA |
| Luminance (at IF=40mA) | L | -- | 500 | -- | 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 Pate | 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 Tbp = 12, Tvfp = 8, Tvw = 4 and 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 | Remark |
|---|---|---|---|---|---|---|---|
| Response Time (Tr+Tf) | Tr+Tf | θx = θy = 0° | -- | 20 | 30 | ms | Note 1 |
| Contrast Ratio | CR | θx = θy = 0° | 500 | 700 | -- | -- | Note 2 |
| 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. | Note 3 |
| Viewing Angle (Bottom) | θB | CR > 10 | -- | 80 | -- | Deg. | Note 3 |
| Viewing Angle (Left) | θL | CR > 10 | -- | 60 | -- | Deg. | Note 3 |
| Viewing Angle (Right) | θR | CR > 10 | -- | 70 | -- | Deg. | Note 3 |
| Luminance (IF=40mA) | L | θx = θy = 0° | -- | 500 | -- | cd/m² | Note 4 |
Note: Compared to the V1 version, the Luminance (Typ.) has been increased from 380 cd/m² to 500 cd/m². All other optical and electrical parameters remain identical.
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 minimized.
- RGB Parallel Interface: The 24-bit RGB interface uses 8 data lines per color (R0-R7, G0-G7, B0-B7) along with CLK, HS, VS, and DE control signals. The clock frequency is up to 12 MHz.
- Backlight Driver (External): The module provides LEDA (anode) and LEDK (cathode) pins. An external constant current driver is required. The V2 version achieves a higher luminance of 500 cd/m² compared to the V1's 380 cd/m², which may necessitate a slightly higher drive current (confirm with the datasheet).
- 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.
- 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-V2 from Lesson Smart Display Technology is an enhanced version of the V1 4.3-inch TFT-LCD module. The key improvement is the increased luminance from 380 cd/m² to 500 cd/m², making it suitable for brighter ambient environments. It retains the same resolution (480×272), contrast ratio (700:1), and full 24-bit RGB interface. This V2 version is a drop-in replacement for V1 designs requiring higher brightness, but the backlight driver design should be reviewed to ensure it can provide the necessary current for the brighter panel (likely ~40mA as per the spec).
For successful design-in, engineers should:
- Obtain and review the complete, official Product Specification (Revision 1.0) for the full mechanical drawing, detailed timing diagrams, and backlight current requirements.
- Design a clean 3.3V power supply and a backlight constant current driver circuit capable of delivering sufficient current (likely ~40mA) to achieve the 500 cd/m² luminance.
- Contact the manufacturer for evaluation modules, sample requests, and further technical support during the design-in phase.
This module is designed to provide a brighter, reliable, and cost-effective display solution for a wide array of embedded systems.
