4.0 Inch IPS Square Screen, 720×720, 320 Nits with Capactive Touch Panel
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S040BWX25NN-FC25-A
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4.0"丨720 x 720 Pixels
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IPS with All viewing angle
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Capactive with l²C interface
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MIPI
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I2C
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-20°C~+60°C
Product Description
This 4.0-inch square IPS capacitive touch display is designed specifically for smart home control panels and thermostat devices.
With a 720×720 square resolution, it supports modern UI layouts commonly used in wall-mounted thermostats, HVAC controllers, and home automation interfaces. The IPS panel ensures wide viewing angles, while the capacitive touch panel provides smooth and responsive user interaction for daily operation.
The display is suitable for always-on indoor smart home applications where stability, readability, and user experience are essential.
Product Features：
– 4.0-inch square IPS TFT LCD, suitable for compact wall-mounted smart devices
– 720 × 720 square resolution, optimized for thermostat and smart home UI design
– Projected capacitive touch panel for accurate and responsive user control
– 320 nits typical brightness, ideal for indoor smart home environments
– Wide viewing angle IPS technology for clear visibility from different positions
– Designed for continuous operation in always-on smart home systems
CDTech provides display solutions for smart home and industrial control applications, offering customization options such as touch panel configuration, interface support, and mechanical integration.
Our displays are designed to support long-term supply and stable performance for smart home device projects.
Product Specification
| LCD Size | 4.0 inch |
| LCD Resolution | 720*720pixels |
| LCD Active Area | 71.93 x 71.93 (mm) |
| LCD Luminance | 320nits |
| LCD Viewing Angle | IPS with All viewing angle |
| LCD Interface | MIPI |
| LCD Controller | ST7703-V1 |
| LCD Connection Type | FPC: 30PIN with 0.5 pitch, Connector :( FH12-30S-0.5SH ) |
| LCD Backlight Array | 2 Strings with 5 LED on each string |
| LCD Backlight Controller | None |
| LCD Backlight Driving | IF=40mA，VF=13.5~17V |
| LCD Outline Dimension | 74.83 x 78.98 x 1.96 (mm) |
| CTP structure | G+FF |
| CTP interface | I2C |
| CTP Controller | FT5446IDQQ |
| CTP Outline Dimension | 86.00 x 86.00 x 1.45 (mm) |
| CTP Connection Type | FPC: 9PIN with 0.5 pitch |
| Product Outline Dimension | 86.00 x 86.00 x 3.59 (mm) |
| Product Operation Temp | -20℃ ~ +60℃ |
| Product Storage Temp | -30℃ ~ +70℃ |
Recommendations for use
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LCD Customization
To meet the diverse needs of the LCD market, CDTech can provide size customisation services, including AA size and OD size. We can also support customised square screens(for smart home and industrial control) and round screens(for automotive, cooking equipment, etc.) and other distinctive sizes.
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Touch Panel Customization
We provide custom cover lens solutions with various shapes, thicknesses (ranging from 0.55mm to 6.0mm), and surface treatments such as AG (Anti-Glare), AF (Anti-Fingerprint), and AR (Anti-Reflection). We can adhere foam to the cover surface and ring-type foam adhesive (like 3M VHB/Tesa) on the back for better installation and dust/water resistance. For UV resistance in outdoor applications, we use special UV-resistant inks or ceramic prints on tempered glass. We can also customize higher-spec cover lenses, like Gorilla and Dragontrail, for IK rating requirements.
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Usage Guidelines
CDTech’s LCD products have high quality reliability, allowing customers to use them for a long time without easily breaking down. However, we also suggest that customers will follow the correct operation or storage methods when using them: try to avoid direct contact with the FPC gold fingers with hands to prevent oxidation. It is recommended to wear anti-static gloves or finger cots for operation, and ensure effective grounding. When the products are not used for a long time, they should not be stored in high-temperature and high-humidity environments for a long time, but should be stored in a warehouse with appropriate temperature and humidity.
Quality Standards
CDTech adheres to a Zero Defect Quality Policy, which includes not only product quality but also the work quality of all departments in the company. This will make our products, quality, service, and technical support exceed your expectations.
All of our products, from evaluation, design, production, inspection to after-sales service, follow the following standards in the process.
| Project Evaluation |
Comprehensively and accurately understand and evaluate customer requirements, including performance, specifications, usage environment, special characteristics, safety characteristics, etc. Identify and evaluate potential risk factors. |
| Product Design |
Strictly follow the requirements of ISO9001 and IATF16949 systems for product design, while also considering material selection, manufacturability and assemblability, past successful product structures and experiences to ensure effective implementation in subsequent production. In the sample stage, verify according to the reliability test requirements in the specification. |
| Production Control |
All important processes of LCM and CTP are produced by CDTech itself, ensuring effective control and assurance of the production process. Strictly follow the production process to ensure that each operation meets established standards, select high-quality raw materials that meet specification requirements, and ensure the stability of product performance. |
| Production Inspection |
All CDTech products have undergone 100% functional testing and visual inspection to ensure that they meet design requirements and customer expectations. |
| After Sales Service |
We have established a rapid response mechanism to promptly handle customer feedback and complaints. Usually, we can reply to customers within 1 day about the possible causes of defects and temporary measures, issue a defect judgment report within 3 days of receiving the defective product, and issue an 8D analysis and improvement report within 7 days. |
| Product Lifetime |
The lifetime of our product is determined by the lifetime of the LED in the backlight, usually 30000 hours or 50000 hours. Please refer to the specifications for details. |
| Warranty period |
The warranty period of CDTech is one year according to LCD industry standards. Within one year, any product with any problems can receive free after-sales service and returns. After one year, CDTech can still provide paid after-sales service. |
| ESD Protection |
All devices are designed and handled in consideration of ESD protection. This includes ESD-SAFE packaging within anti-static bags, wraps, and trays. Customers are reminded to always follow ESD safety to best protect the devices. |
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7F, Bldg 2, Jiancang Technology Park, No.11 Songgang Blvd., Baoan, Shenzhen
