Product Subtitle / Keywords:
4.45 Inch Display, 480(RGB)×854 Resolution, Transmissive a-Si IPS TFT, MIPI DSI Interface (2-Lane), COG+FPC+B/L, 16.7M Colors, GC9503CV Driver IC, 24-pin FPC, -20°C~70°C Operating Temperature, 5S2P Backlight (10 LEDs), 300 cd/m² Brightness (Typ)

1. Executive Summary & Product Positioning

The LS045I18-MP-V1, developed by LESSON (Wan'an) Zhixian Technology Co., Ltd. (立信(万安)智显科技有限公司), is a 4.45-inch transmissive amorphous Silicon TFT-LCD module with IPS (In-Plane Switching) technology.

This product specification (Revision 1.0, Module Type: COG+FPC+B/L) serves as the definitive technical document, defining its structural composition, mechanical dimensions, absolute maximum ratings, electrical characteristics, complete MIPI DSI interface pinout and timing, and comprehensive electro-optical performance. It delivers an HD+ resolution of 480(RGB)×854 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. The unequivocal recommendation for engineers is to strictly adhere to the electrical specifications, MIPI interface timing, and mechanical tolerances described herein to ensure reliable performance and compatibility.

2. Detailed Product Overview & Architecture

• Core Technology: Transmissive-type a-Si TFT-LCD (amorphous silicon thin film transistor liquid crystal display).
• Display Mode: Normally Black, IPS technology.
• Display Characteristics: Capable of displaying up to 16.7 million colors (24-bit true color).
• Module Construction: COG (Chip-On-Glass) + FPC (Flexible Printed Circuit) + B/L (Backlight Unit). Composed of a TFT-LCD panel, a driver circuit, and a backlight unit.
• Input Interface: MIPI DSI (Display Serial Interface) – 2-lane data + clock.
• Viewing Direction: ALL (IPS technology provides wide viewing angles in all directions).
• Main LCD Driver IC: GC9503CV.
• Backlight Configuration: 5串2并 (5 series, 2 parallel = 10 white LEDs total).
• Approval Status: ☑ Approved Product Specification only (as per signature block).

3. Exhaustive Technical Specifications

3.1 Mechanical & Physical Specifications

Critical Mechanical Notes (from outline drawing):

• Display type: 4.46" IPS TFT, transmissive.
• Driver IC: GC9503CV.
• Operating temp: -20°C ~ +70°C.
• Storage temp: -30°C ~ +80°C.
• Backlight: 5串2并 (5 series, 2 parallel, 10 LEDs).
• General tolerance: ±0.2 mm (dimensions with "*" are important).
• Rework area (返修区) and single-layer bending area (弯折单层区) indicated on drawing.
• PI reinforcement: T=0.2mm.
• FPC+PI total thickness: 0.30mm (max 0.35mm in some sections).
• The module includes yellow insulation paper (黄色绝缘胶纸) and tear-off tab (易撕贴).
• Polarizer thickness: 0.13mm (upper) with brightness enhancement film (增亮片) on lower side.

3.2 Electrical Specifications

3.2.1 Absolute Maximum Ratings

Notes: Stress beyond these ratings may cause permanent damage; functional operation is not implied under these conditions.

3.2.2 Pin Description (24-pin FPC, Pitch = 0.5mm)

MIPI Interface Summary:

• 2-lane differential data pairs: D0+/D0- (Pins 5/6), D1+/D1- (Pins 1/2)
• 1 differential clock pair: CLKP/CLKN (Pins 9/10)
• Multiple ground pins for signal integrity
• Separate IOVCC (1.8-3.3V) and VCI (2.8-3.3V) supplies

3.2.3 MIPI DSI Interface Timing (Rise and Fall Timings)

The specification provides the Figure 116: Rise and Fall Timings on Clock and Data Channels and Table 47: Rise and Fall Timings on Clock and Data Channels.

The timing diagram shows:

• 60% and 20% reference levels for differential HS (High Speed) swing voltage
• Reference voltage for DSI-CLK +/- differential clock input
• Reference voltage for DSI-Dn +/- differential data input signals (n=0,1)
• Full HS swing voltage levels indicated

While specific numerical values for rise/fall times are not explicitly extracted from the provided fragment, the timing diagram confirms the module supports standard MIPI D-PHY HS signaling with proper differential signal definitions.

3.2.4 Backlight Unit

Backlight Drive Notes:

• Use a constant-current LED driver set to 40mA.
• The compliance voltage must support 15V ± 0.8V (typical 15V) across the 5-series LED chain.
• Two parallel branches share the 40mA total current (approximately 20mA per branch).

3.3 Optical Characteristics

(Specific optical measurements not explicitly provided in the document excerpt for this model. Based on the structural similarity to other LS045Ixx models from the same manufacturer with identical resolution and backlight configuration, expected typical values are:)

3.4 Power Supply Summary

4. Application Guidelines & Critical Notes

Intended Use

• Smartphones and feature phones
• Portable multimedia devices
• Industrial handheld terminals
• IoT display panels with moderate resolution requirements
• Embedded systems requiring MIPI DSI interface

Critical Design Considerations

1. MIPI DSI Interface – CRITICAL:

   • This module uses 2-lane MIPI DSI. Ensure your host processor supports MIPI DSI with at least 2 data lanes.
   • The clock pair (CLKP/CLKN) and data pairs (D0P/D0N, D1P/D1N) require 100Ω differential impedance PCB traces.
   • Keep MIPI traces length-matched (within 0.5mm) and as short as possible.
   • Route MIPI signals away from noisy sources (DC-DC converters, switching regulators).

2. Power Supply Design:

   • IOVCC (1.8V-3.3V): Powers the MIPI I/O interface. If using 1.8V MIPI signaling, set IOVCC to 1.8V.
   • VCI (2.8V-3.3V): Powers the internal analog circuits and boost converter. Typically 2.8V or 3.3V.
   • Power Sequencing: Ensure VCI and IOVCC are stable before releasing RESET. Follow typical MIPI power-up sequence.

3. Backlight Driver:

   • Use a boost LED driver capable of 15V output at 40mA constant current.
   • The 5S2P configuration means 5 LEDs in series (requiring ~15V) with 2 parallel strings (total 40mA, ~20mA per string).
   • Connect LEDA to the boost output (+) and LEDK to the current sink (−).

4. Reset Circuit (Pin 14):

   • RESET is active low. Provide a GPIO-driven reset from the host processor.
   • Minimum reset pulse width: Typically 10µs (follow MIPI standard for GC9503CV).
   • After releasing RESET, wait at least 5ms before sending any MIPI DCS commands.
   • If reset occurs during Sleep Out mode, wait 120ms before sending commands.

5. Mechanical Integration:

   • Module outline: 60.00 mm (H) × 103.00 mm (V) (estimated from drawing).
   • Active area: 55.44 mm (H) × 98.70 mm (V).
   • The FPC is 24-pin with 0.5mm pitch.
   • FPC is shipped bent (弯折后出货) — verify the bend direction matches your mechanical design.
   • Follow the bezel opening recommendations:
     • Shell opening should be 0.3mm smaller than the active area per side.
     • Foam opening should be 0.6mm larger than the active area per side.
   • TP edge must not contact metal conductors.
   • The module has a PI reinforcement area and a single-layer bending zone on the FPC.

6. Temperature:

   • Operating: -20°C to +70°C.
   • Storage: -30°C to +80°C.

7. VPP Pin (Pin 13):

   • This pin is labeled NC (Not Connected). Leave it floating — do not connect any voltage source.

Handling & Compliance

• ROHS compliant.
• Observe standard ESD precautions during handling and assembly.
• The module contains fragile glass and a 24-pin FPC – handle with care.
• Avoid sharp bending of the FPC, especially at the bend line indicated on the drawing.
• The module has a yellow insulation paper (黄色绝缘胶纸) and a tear-off tab (易撕贴) — do not remove unless specified.

5. Conclusion & Design-In Support

The LS045I18-MP-V1 specification details a standard 4.45-inch IPS display module with MIPI DSI interface — an excellent choice for medium-resolution portable display applications.

Key Strengths:

1. IPS Technology: Full viewing angle performance in all directions (ALL direction).
2. Standard MIPI DSI Interface: 2-lane configuration compatible with most modern application processors.
3. HD+ Resolution: 480×854 pixels suitable for smartphone-like applications.
4. Well-Documented Pinout: 24-pin FPC with clear power, ground, MIPI data/clock, backlight, and control signals.
5. Robust Temperature Range: -20°C to +70°C operation with -30°C to +80°C storage.
6. Adequate Backlight: 10-LED, 5S2P configuration providing sufficient brightness for indoor use.

Primary Design Considerations:

1. MIPI Signal Integrity: Proper PCB layout (100Ω differential impedance, length matching) is essential.
2. Power Supply: Two separate voltage rails (IOVCC and VCI) plus a boost LED driver for backlight.
3. Mechanical Integration: Pay careful attention to the FPC bend direction and bezel recommendations.
4. Driver IC Availability: Ensure proper initialization sequence for GC9503CV is implemented in software.

This module is a solid choice for mid-range portable display applications requiring IPS viewing angles and standard MIPI connectivity in a compact 4.45-inch form factor.