LS045I12-R-V1: 4.5-Inch a-Si TFT LCD Module, 480×854 Resolution, 16.7M Colors, SPI+RGB Interface, 40-Pin, GC9503CV Driver
Product Subtitle / Keywords
4.5 Inch Display, 480(RGB)×854 Resolution, Transmissive Color Active Matrix TFT, SPI3W+RGB18bit Interface, COG+FPC+B/L, 16.7M Colors, 40-Pin, GC9503CV Driver, 58.8×107.4×2.03 mm, 750 cd/m² Brightness, 700:1 Contrast Ratio, ALL Viewing Direction, -20°C~70°C Operating Temperature
1. Executive Summary & Product Positioning
The LS045I12-R-V1, developed by Lixin (Wan'an) Intelligent Display Technology Co., Ltd. (立信(万安)智显科技有限公司), is a 4.5-inch transmissive type color active matrix TFT (Thin Film Transistor) liquid crystal display (LCD) module that uses amorphous silicon TFT as a switching device.
This product specification (Revision 1.0, Module Type: COG+FPC+B/L) serves as the definitive technical document, defining its structural composition (TFT-LCD module (TFT-LCD panel, driver IC and FPC), a back-light unit), physical features, mechanical dimensions, absolute maximum ratings, detailed electrical characteristics, complete SPI+RGB interface pinout and timing, and comprehensive electro-optical performance. It delivers a resolution of 480 RGB × 854 pixels with 16.7M-color display capability, driven by the GC9503CV controller.
The document provides the core parameters necessary for system integration into embedded display applications requiring a standard portrait-oriented display with a flexible interface. The unequivocal recommendation for engineers is to strictly adhere to the electrical specifications, interface timing, and mechanical tolerances described herein to ensure reliable performance and compatibility.
2. Detailed Product Overview & Architecture
- Core Technology: Transmissive type color active matrix TFT (Thin Film Transistor) liquid crystal display (LCD) that uses amorphous silicon TFT as a switching device. This model is composed of a TFT-LCD module (TFT-LCD panel, driver IC and FPC), a back-light unit.
- Display Mode: Active matrix TFT, Transmissive type.
- Display Format: Graphic 480 RGB × 854 pixels.
- Display Characteristics: Capable of displaying up to 16.7 million colors.
- Module Construction: COG (Chip-On-Glass) + FPC (Flexible Printed Circuit) + B/L (Backlight Unit).
- Input Data: SPI3W+RGB18bit.
- Viewing Direction: ALL.
- Drive IC: GC9503CV.
- Connector Pin Count: 40-Pin.
- Approval Status: ☑ Approved Product Specification only (as per signature block).
3. Exhaustive Technical Specifications
3.1 Mechanical & Physical Specifications
| Module size (H×V×D) | 58.8 × 107.4 × 2.03 mm |
| Active area (H×V) | 55.44 × 98.64 mm |
| Number of pixels / Resolution | 480(H) × 854(V) pixels |
| Panel Size (Diagonal) | 4.5 inch |
| Pixel arrangement | RGB stripe |
| Pixel Pitch | 0.1155 × 0.1155 mm |
Critical Mechanical Design Notes (from outline dimension drawing):
- Display Type: 4.5" TFT LCD, IPS LCD & CF.
- Resolution: 480RGB(H) × 854(V).
- Viewing Direction: ALL.
- Driver IC: GC9503CV.
- Operating Temperature: -20°C ~ 70°C.
- Storage Temperature: -30°C ~ 80°C.
- Backlight: 10 White LED Series, Vf=15V, If=40mA.
- General Tolerance: ±0.2 mm (unless otherwise specified).
- Angular Tolerance: ∠ ±1/4°.
- FPC Total Thickness: PI补强+FPC总厚=0.30±0.03mm.
- FPC Pin Count: 40 pins.
- Silver Paste Points: Present on the module (点银浆处).
- Yellow Insulation Paper: Included for handling during assembly (易撕贴).
- FPC Bending: The module supports FPC bending for space-constrained designs (展开出货).
- Enclosure Design Notes: It is recommended that the housing visible area be 0.3mm smaller per side than the LCD AA. It is recommended that the housing foam opening window be 0.9mm larger per side than the LCD AA. The TP edge must not contact metal conductors.
3.2 Electrical & Interface Specifications
3.2.1 Absolute Maximum Ratings
| Characteristics | Symbol | Min. | Max. | Unit | Notes |
|---|---|---|---|---|---|
| Supply Voltage | IOVCC | -0.3 | 4.6 | V | |
| Supply Voltage | VCI | -0.3 | 4.6 | V | |
| TFT Gate On voltage | VGH | -0.3 | 30 | V | |
| TFT Gate Off voltage | VGL | -0.3 | 30 | V | |
| Backlight Forward Current | IF | - | 40 | mA | |
| Operating Temperature | TOPR | -20 | +70 | °C | (1), (3) |
| Storage Temperature | TSTG | -30 | +80 | °C | (2), (3) |
| Humidity | RH | - | 90 | % | Max. 60 °C |
3.2.2 LCM DC Characteristics
| Characteristics | Symbol | Min. | Typ. | Max. | Unit | Note |
|---|---|---|---|---|---|---|
| Power Supply Voltage 1 | IOVCC | 1.65 | 1.8 | 3.3 | V | |
| Power Supply Voltage 2 | VCI | 2.5 | 2.8 | 3.6 | V | |
| Input voltage "L" Level | VIL | GND | - | 0.3IOVCC | V | IOVCC=1.65~3.3 |
| Input voltage "H" Level | VIH | 0.7IOVCC | - | IOVCC | V | IOVCC=1.65~3.3 |
| Output voltage "L" Level | VoL | GND | - | 0.2IOVCC | V | IoL=1mA |
| Output voltage "H" Level | VoH | 0.8IOVCC | - | IOVCC | V | IOH=-1mA |
3.2.3 Pin Description (40-pin FPC)
| Pin No. | Symbol | Description |
|---|---|---|
| 1 | LEDA | Back-light Anode |
| 2 | LEDK | Back-light Cathode |
| 3 | LEDK | Back-light Cathode |
| 4 | GND | Power Ground |
| 5 | VCC | Power supply for interface logic circuits (2.8V-3.3V) |
| 6 | RST | Reset input pin |
| 7 | NC | NC |
| 8 | NC | NC |
| 9 | SDA | Serial data input / output bidirectional pin for SPI. |
| 10 | SCK | Serial clock input for SPI interface. |
| 11 | CS | A chip select signal |
| 12 | PCLK | Dot clock signal for RGB interface operation |
| 13 | DE | Data enable signal for RGB interface operation |
| 14 | VS | Frame synchronizing signal for RGB interface operation |
| 15 | HS | Line synchronizing signal for RGB interface operation |
| 16~33 | DB0-DB17 | A 18-bit parallel data bus for RGB Interface. |
| 34 | GND | Power Ground |
| 35 | TP-INT | TP-INT |
| 36 | TP-SDA | TP-SDA |
| 37 | TP-SCL | TP-SCL |
| 38 | TP-RST | TP-RST |
| 39 | TP-VCC | TP-VCC |
| 40 | GND | Power Ground |
Interface Summary:
- SPI Interface: Uses SDA (Pin 9), SCK (Pin 10), and CS (Pin 11) for SPI communication (likely for command/register configuration).
- RGB Interface: Uses PCLK (Pin 12), DE (Pin 13), VS (Pin 14), HS (Pin 15), and DB0-DB17 (Pins 16-33) for 18-bit parallel RGB data transmission.
- Backlight: Dedicated LEDA (Anode, Pin 1) and LEDK (Cathode, Pins 2, 3) pins.
- Power: VCC (Pin 5) for interface logic (2.8V-3.3V), GND (Pins 4, 34, 40) for ground.
- Control: RST (Pin 6) for hardware reset.
- Touch Pins: Pins 35-39 are reserved for touch panel interface (TP-INT, TP-SDA, TP-SCL, TP-RST, TP-VCC).
- Unused Pins: Pins 7, 8 are NC — leave floating.
3.2.4 SPI Interface Timing Characteristics
| Signal | Symbol | Parameter | Min | Max | Unit |
|---|---|---|---|---|---|
| CSX | TCS | Chip select setup time (write) | 15 | ns | |
| CSX | TCSH | Chip select hold time (write) | 15 | ns | |
| CSX | TCSS | Chip select setup time (read) | 60 | ns | |
| CSX | TSCC | Chip select hold time (read) | 60 | ns | |
| CSX | TCHW | Chip select "H" pulse width | 40 | ns | |
| SCL | TSCYCW | Serial clock cycle (Write) | 66 | ns | |
| SCL | TSHW | SCL "H" pulse width (Write) | 15 | ns | |
| SCL | TSLW | SCL "L" pulse width (Write) | 15 | ns | |
| SCL | TSCYCR | Serial clock cycle (Read) | 150 | ns | |
| SCL | TSHR | SCL "H" pulse width (Read) | 60 | ns | |
| SCL | TSLR | SCL "L" pulse width (Read) | 60 | ns | |
| SDA (DIN) | TSDS | Data setup time | 10 | ns | |
| SDA (DIN) | TSDH | Data hold time | 10 | ns |
3.2.5 Backlight Unit
| Characteristics | Symbol | Condition | Min. | Type | Max. | Unit | Notes |
|---|---|---|---|---|---|---|---|
| Forward Voltage | Vf | IL=20mA | - | 15 | - | V | - |
| Forward current | IL | - | - | 40 | - | mA | - |
| Luminance | Lv | IL=20mA | -- | 750 | -- | cd/m² | - |
| LED life time | - | IL=20mA | 20,000 | 25,000 | -- | Hr | Note 1 |
3.3 Optical & Electro-Optical Characteristics
| Parameter | Symbol | Condition | Min. | Typ. | Max. | Unit | Note |
|---|---|---|---|---|---|---|---|
| Contrast Ratio (Center point) | C/R | - | 550 | 700 | - | - | BM-7 Note(2) |
| Luminance of white (Center point) | Lw | B/L on | 15% | TBD | 15% | cd/m² | CA-210 |
| Luminance uniformity | Uw | θ = 0. Normal viewing angle B/L On Note(1) | 85 | - | - | % | BM-7 Note(3) |
| Response Time | Tr + Tf | θ = 0. Normal viewing angle B/L On Note(1) | 20 | 35 | - | ms | BM-5AS Note(4) |
| Color Chromaticity (CIE 1931) White | Wx | θ = 0. Normal viewing angle B/L On Note(1) | 0.269 | 0.299 | 0.329 | - | CA-210 Note(5) |
| Color Chromaticity (CIE 1931) White | Wy | θ = 0. Normal viewing angle B/L On Note(1) | 0.297 | 0.327 | 0.357 | - | CA-210 Note(5) |
| Color Chromaticity (CIE 1931) Red | Rx | θ = 0. Normal viewing angle B/L On Note(1) | 0.634 | 0.664 | 0.694 | - | CA-210 Note(5) |
| Color Chromaticity (CIE 1931) Red | Ry | θ = 0. Normal viewing angle B/L On Note(1) | 0.293 | 0.323 | 0.353 | - | CA-210 Note(5) |
| Color Chromaticity (CIE 1931) Green | Gx | θ = 0. Normal viewing angle B/L On Note(1) | 0.257 | 0.287 | 0.317 | - | CA-210 Note(5) |
| Color Chromaticity (CIE 1931) Green | Gy | θ = 0. Normal viewing angle B/L On Note(1) | 0.563 | 0.593 | 0.623 | - | CA-210 Note(5) |
| Color Chromaticity (CIE 1931) Blue | Bx | θ = 0. Normal viewing angle B/L On Note(1) | 0.104 | 0.134 | 0.164 | - | CA-210 Note(5) |
| Color Chromaticity (CIE 1931) Blue | By | θ = 0. Normal viewing angle B/L On Note(1) | 0.089 | 0.119 | 0.149 | - | CA-210 Note(5) |
| Viewing Angle Hor. | θT | C/R≥10 | 70 | 80 | - | Deg | EZ Contrast Note(6) |
| Viewing Angle Hor. | θB | C/R≥10 | 70 | 80 | - | Deg | EZ Contrast Note(6) |
| Viewing Angle Ver. | θL | C/R≥10 | 70 | 80 | - | Deg | EZ Contrast Note(6) |
3.4 Reliability Test Conditions
| No. | Test Item | Test Condition | Notes |
|---|---|---|---|
| 1 | High Temperature Storage | +80°C / 240H | Inspection after 2~4h storage at room temperature, the sample shall be free from defects: 1. Air bubble in the LCD; 2. Seal leak; 3. Non-display; 4. Missing segments; 5. Glass crack; 6. The surface shall be free from damage. 7. The electrical characteristics requirements shall be satisfied. |
| 2 | Low Temperature Storage | -30°C / 240H | Inspection after 2~4h storage at room temperature, the sample shall be free from defects: 1. Air bubble in the LCD; 2. Seal leak; 3. Non-display; 4. Missing segments; 5. Glass crack; 6. The surface shall be free from damage. 7. The electrical characteristics requirements shall be satisfied. |
3.5 Version Record
| Version | Revise Date | Page | Content |
|---|---|---|---|
| 00 | — | ALL | New released |
4. Application Guidelines & Critical Notes
Intended Use
- Industrial control panels and human-machine interfaces (HMIs)
- IoT display nodes and smart home controls
- Handheld instruments and consumer electronics
- Any application requiring a compact, portrait-oriented display with a flexible SPI+RGB interface
Critical Design Considerations
- Interface (SPI+RGB): This module uses a combined SPI and RGB interface. The SPI interface (SDA, SCK, CS) is used for command/register configuration, while the RGB interface (PCLK, DE, VS, HS, DB0-DB17) is used for high-speed pixel data transmission. The host MCU must support both interfaces.
- Power Supply: Provide stable IOVCC (1.65-3.3V) for the I/O interface. Provide stable VCI (2.5-3.6V) for the main logic. The backlight requires a constant-current LED driver connected to LEDA (Anode, Pin 1) and LEDK (Cathode, Pins 2, 3), set to 40 mA at approximately 15V (Typ).
- Mechanical Integration: Module outline: 58.8mm (H) × 107.4mm (V) × 2.03mm (D). Active area: 55.44mm × 98.64mm. FPC: 40-pin FPC with PI reinforcement. The module supports FPC bending for space-constrained designs.
- Viewing Angle Characteristics: This module provides ALL viewing direction with 80° in all directions (Typ).
- Optical Performance: Luminance: 750 cd/m² (Typ) – high brightness. Contrast Ratio: 700:1 (Typ) – good contrast performance. Response Time: 35 ms (Typ).
- Temperature Limits: Operating Temperature: -20°C to +70°C. Storage Temperature: -30°C to +80°C.
Handling & Compliance
- The module is RoHS compliant.
- Observe standard ESD precautions during handling and assembly.
- The module contains fragile glass and a 40-pin FPC – handle with care.
- Avoid bending the FPC sharply, especially near the connector interface.
- The module has a total thickness of 2.03mm – be careful when handling to avoid flexing.
- The module includes a yellow insulation paper and release tape/sticker for handling during assembly.
5. Conclusion & Design-In Support
The LS045I12-R-V1 specification details a high-performance 4.5-inch display module with a combined SPI+RGB interface and GC9503CV driver — an excellent choice for applications requiring a larger display area with high brightness and flexible interface options.
Key Strengths
- High Brightness: 750 cd/m² (Typ) ensures excellent readability even in bright environments.
- Flexible Interface: The combined SPI+RGB interface allows for command configuration via SPI and high-speed pixel data transfer via RGB.
- High Color Depth: 16.7M colors (24-bit true color) provides excellent color reproduction.
- Wide Viewing Angles: 80° in all directions (ALL) ensures consistent image quality from any perspective.
- Standard 4.5-inch Size: Suitable for a wide range of industrial and embedded applications.
- Wide Operating Temperature Range: -20°C to +70°C for operation and -30°C to +80°C for storage.
- Comprehensive Reliability Testing: The module has been tested for high and low temperature storage.
Main Design Focus
- The critical design task is properly implementing the combined SPI+RGB interface to ensure reliable command configuration and high-speed data transfer.
- Supporting requirements: Provide stable IOVCC (1.65-3.3V) and VCI (2.5-3.6V) power. Provide a constant-current backlight driver set to 40 mA at 15V (Typ). Mechanical integration — the module outline is 58.8mm × 107.4mm × 2.03mm. FPC connector — verify the 40-pin FPC and consider FPC bending if needed.
This module is an excellent choice for industrial control panels, smart home devices, and any embedded application requiring a larger, high-brightness display with a flexible interface and excellent image quality.
