LS045I14-R-V1 4.45 inch TFT-LCD Module 480x854 16.7M Colors IPS
1. Executive Summary & Product Positioning
The LS045I14-R-V1 is a 4.45-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 4.45 inch and the resolution is 480(RGB)*854, the panel can display up to 16.7 M colors.
Product Positioning: This module features an IPS (In-Plane Switching) panel, offering wide viewing angles (up to 80 degrees in all directions) and good color reproduction. It is well-suited for a wide range of portable and embedded applications requiring a compact, high-resolution display. Typical uses include smartphones, mobile devices, portable instruments, and other human-machine interface (HMI) systems.
2. Detailed Product Overview & Architecture
The module's architecture is designed for robust performance and easy integration. The primary components include:
- TFT-LCD Panel: 4.45-inch diagonal, a-Si TFT active matrix, transmissive, IPS mode. Resolution is 480(RGB) × 854 pixels with an active area of 55.44 (H) × 98.637 (V) mm.
- Driver IC: The module uses the GC9503CV driver IC.
- Backlight Unit (B/L): A white LED backlight configuration of 5-series 2-parallel. The typical driving condition is IF=40mA and Vf=15±0.8V.
- Mechanical Construction: COG (Chip-on-Glass) + FPC + B/L. The module outline dimensions are 60 (H) × 109 (V) × 2.06 (D) mm.
- Interface: The module communicates via a 40-pin FPC connector. It supports an SPI interface for command and an 18-bit RGB (DPI) interface for pixel data.
- Viewing Direction: IPS (All directions).
3. Exhaustive Technical Specifications
3.1 General & Mechanical Specifications
| Item | Specification |
| Display Size (Diagonal) | 4.45 inches |
| Resolution (Dots) | 480(RGB) × 854 |
| Display Technology | Active Matrix TFT, Transmissive, a-Si, IPS |
| Module Construction | COG+FPC+B/L |
| Color Depth | 16.7M Colors |
| Viewing Direction | IPS (All Views) |
| Input Data Interface | SPI (Command) + 18-bit RGB (DPI) |
| Driver IC | GC9503CV |
| Module Size (H×V×D) | 60 × 109 × 2.06 mm |
| Active Area (H×V) | 55.44 × 98.637 mm |
| Display Mode | Transmissive, IPS |
| Operating Temperature | -20°C to +70°C |
| Storage Temperature | -30°C to +80°C |
3.2 Electrical Characteristics
3.2.1 Recommended Operating Conditions
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply voltage | VCI | 2.5 | 2.8 | 3.3 | V |
| I/O supply voltage | IOVCC | 1.65 | 1.8 | 3.3 | V |
| Input voltage (Low level) | VIL | VSS | -- | 0.3*IOVCC | V |
| Input voltage (High level) | VIH | 0.7*IOVCC | -- | IOVCC | V |
3.2.2 Backlight LED Characteristics
The backlight circuit is configured as 5-Series 2-Parallel (5串2并). The total drive current is 40mA at a forward voltage of 15V (Typ.).
| Parameter | Symbol | Typ | Unit |
|---|---|---|---|
| Forward Voltage (Total) | Vf | 15 ± 0.8 | V |
| Forward Current | If | 40 | mA |
3.3 Interface Pin Assignment (40-Pin FPC)
Connector: 40-pin FPC. The module uses an SPI interface for command/control and an 18-bit RGB interface for pixel data.
| PIN NO. | Symbol | I/O | Description |
|---|---|---|---|
| 15 | CS | I | Chip select signal. |
| 16 | GND | P | Ground |
| 17 | PCLK | I | Dot clock signal for DPI (RGB) interface operation. |
| 18 | DE | I | Data enable signal for DPI (RGB) interface operation |
| 19 | VS | I | Frame synchronizing signal for DPI (RGB) interface operation |
| 20 | HS | I | Line synchronizing signal for DPI (RGB) interface operation. |
| 21-26 | R0-R5 | I | Red data bus (6-bit: R5 is MSB) |
| 27-32 | G0-G5 | I | Green data bus (6-bit: G5 is MSB) |
| 33-38 | B0-B5 | I | Blue data bus (6-bit: B5 is MSB) |
Note: The pin description shows 18 data bus pins (R0-R5, G0-G5, B0-B5) which correspond to an 18-bit RGB interface.
3.4 Electro-Optical Characteristics (Ta=25°C)
| Item | Symbol | Condition | Min. | Typ. | Max. | Unit | Remark |
|---|---|---|---|---|---|---|---|
| Response time | Tr + Tf | θx = θy=0 | -- | 20 | 35 | ms | Note 1 |
| Contrast Ratio | CR | θx = θy=0 | 550 | 700 | -- | -- | Note 2 |
| Transmittance | T% | θx = θy=0 | 3.4 | 4.0 | -- | % | |
| Color Chromaticity (CIE1931) White | Wx, Wy | θx = θy=0 | (0.269, 0.297) | (0.299, 0.327) | (0.329, 0.357) | -- | |
| Viewing angle (All directions) | θT, θB, θL, θR | CR > 10 | -- | 80 | -- | Deg. | Note 3 |
| Luminance (IF = 40mA) | L | -- | -- | 350 | -- | cd/m² | Note 4 |
3.5 Inspection Standards & Design Notes
- AQL: Acceptable Quality Level per GB/T 2828-2003 (Normal inspection, Class II).
- B/L Driver: The backlight driving condition is IF=40mA, Vf=15±0.8V (5S2P configuration).
- Mechanical: Tolerance of segments to edge of glass: ±0.2mm. TP edge should not contact metal conductors.
- 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.
- RoHS: RoHS compliance.
4. Application Guidelines & Critical Notes
- Power Supply: The module requires a 2.8V (Typ.) power supply for VCI and 1.8V (Typ.) for IOVCC. Ensure the power supply ripple is minimized.
- Interface: This module uses a combination of SPI (for command/control) and 18-bit RGB (for pixel data) interfaces. The microcontroller must be configured to drive both interfaces correctly.
- Backlight Driver (External): An external constant current driver is required to supply a typical current of 40mA at a forward voltage of 15V. The circuit is configured as 5 LEDs in series and 2 in parallel (5S2P).
- 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 LS045I14-R-V1 from Lesson Smart Display Technology is a 4.45-inch TFT-LCD module with an IPS panel and a resolution of 480×854. It is a compact, high-resolution solution suitable for a variety of embedded display applications requiring wide viewing angles and good color performance.
For successful design-in, engineers should:
- Obtain and review the complete, official Product Specification (Revision 1.0) for the full mechanical drawing, the GC9503CV driver IC datasheet for detailed command initialization, and confirmation of the backlight circuit configuration.
- Design a clean 2.8V/1.8V power supply and a backlight constant current driver circuit capable of delivering 40mA at 15V.
- 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.
