Custom 3.5" IPS TFT LCD Display Module for Solar Controller
Time：2025-12-03
Overview
 
In this project, a client who was developing next-generation solar controllers needed a small display module that could be read in sunlight and had touchscreen functionality. Sonytek provided the TT03503CTA-50, a 3.5-inch 320x480 IPS TFT LCD paired with a capacitive touch panel driven by the FT6366U controller. This makes it easy to see, reliable and easy to use outside.
 
Although this model is similar to the well-known ER-TFT035IPS-6 structure, the final product was adjusted to meet the customer's specific mechanical layout and system requirements.
 
Customer Requirements
 
The client needed a display solution for a compact solar controller with the following expectations:
 
Clear outdoor visibility under strong sunlight
 
Wide viewing angles for different installation positions
 
Stable touch response even when used with dusty or humid environments
 
Long-term durability suitable for 24/7 outdoor operation
 
Compatibility with their existing mainboard and mechanical housing
 
Sonytek collaborated closely with the client to ensure the module fit both electrical and structural constraints without requiring major system redesign.

 
Why TT03503CTA-50 Was Selected
 
1. IPS Technology for Superior Readability
 
The IPS LCD panel offers:
 
80° wide viewing angles
 
Consistent color performance
 
Better visibility in bright outdoor environments
 
These features make it ideal for solar controllers where users frequently check parameters in direct sunlight.
 
2. 320×480 High-Resolution Interface
 
The crisp resolution ensures:
 
Clear reading of voltage/current data
 
Smooth graphical UI
 
Better user interaction with real-time monitoring screens
 
3. FT6366U Capacitive Touch Controller
 
The integrated CTP driven by FT6366U provides:
 
Fast touch response
 
Stable performance under outdoor temperature fluctuations
 
Noise immunity for power-electronics environments
 
Support for gestures and multi-touch functions
 
4. Robust Structure for Outdoor Use
 
The module maintains:
 
Strong bonding between LCD & touch panel
 
Reliable FPC connection
 
Operating temperature suitable for outdoor solar controllers
 
Customization Highlights
 
To align with the customer’s hardware and mechanical design, Sonytek delivered several tailored adjustments:
 
✔ Customized FPC Shape & Length
 
Optimized to match the customer's PCB connector position, eliminating the need to redesign the housing.
 
✔ Touch Sensitivity Tuning
 
FT6366U parameters were adjusted to ensure accurate touch detection even in dusty outdoor scenarios.
 
✔ Brightness Optimization
 
The backlight brightness was calibrated for outdoor readability while balancing power efficiency—important for solar-powered equipment.
 
✔ Mechanical Reinforcement
 
Extra structural support was added to enhance vibration resistance, critical for field-installed controllers.
 
Application in Solar Controller Systems
 
When integrated into the client’s solar controller:
 
The IPS display improved outdoor legibility of system parameters
 
The CTP panel made navigation more intuitive
 
Real-time monitoring (battery SOC, PV input, charging status) became more user-friendly
 
The compact module fit seamlessly into the existing enclosure
 
Users can now adjust settings, check statistics, and oversee charging performance with ease.
 
Project Outcome
 
After testing and validation, the customized TT03503CTA-50 module successfully entered the client’s production line. The final results included:
 
Faster UI interaction thanks to FT6366U
 
Reduced glare issues compared to their previous TN display
 
Higher customer satisfaction from clear daytime readability
 
Improved system reliability due to Sonytek’s component durability
 
This project demonstrates how a standard model—similar to ER-TFT035IPS-6—can be elevated through precise customization to meet a specific industry application.
 
Looking for a Custom LCD Module?
 
Sonytek provides custom TFT LCD, touch panel, and display module solutions for industrial, solar energy, IoT, and embedded devices.
If you need FPC customization, brightness tuning, CTP optimization, or mechanical adjustments, feel free to contact us.
 
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