Featured Standard & Custom TFT Modules
Direct factory supply from our Shenzhen manufacturing center. Explore high-performance display matrices engineered for automotive dashboards, industrial HMIs, and compact IoT embedded designs.
Engineering the Precision 4-Inch & Sub-5-Inch Display Frontier
As human-machine interaction shifts toward ultra-compact industrial edge gateways, smart building automation, and portable diagnostic terminals, the 4-inch TFT LCD form factor has emerged as the definitive golden ratio for embedded visual ergonomics.
Form Factor Versatility
Custom 4-inch modules encompass standard 4:3, square 1:1 (e.g., 480×480 or 720×720 rotary knob formats), portrait verticals (480×800), and ultra-wide bar topologies. Xunrui engineers optimize the substrate glass cut for zero structural wastage.
Low-Power Bus Architecture
Modern 4" TFT installations demand extreme power frugality for battery-operated handheld instruments. We integrate QSPI, 3/4-wire SPI, MCU 8080/6800, and 2-lane MIPI-DSI interfaces powered by integrated ST7701S or ILI9806 ICs with deep sleep states.
Severe Sunlight Readability
From 350-nit indoor smart thermostats to 1500+ nit marine and EV-charging stations, our high-efficiency LED arrays incorporate thermal copper dissipators, 3M optical films, and transflective polarizers to eliminate thermal drift and black-screen sun washout.
Industrial Touch Ruggedization
Integrated Projected Capacitive (PCAP) and 4-wire Resistive Touch (RTP) sensors feature custom Asahi Dragontrail or Corning Gorilla cover lenses with Anti-Glare (AG), Anti-Reflective (AR), and Anti-Fingerprint (AF) coatings engineered for heavy-glove and wet operation.
Optical Architecture & Future Display Roadmaps
A deep dive into how Xunrui Optoelectronics optimizes liquid crystal alignment, optical stack transmissivity, and thermal management for mission-critical electronic devices.
IPS Wide Viewing Matrix (85/85/85/85)
Traditional Twisted Nematic (TN) displays suffer from grayscale inversion and hue shifts when viewed off-axis. Our 4" IPS (In-Plane Switching) panels utilize horizontal electric field shifting, delivering true 178° symmetric viewing cones with stable color fidelity (ΔE < 2.0).
This optical stability is non-negotiable for medical patient monitors and automotive center consoles where off-angle observation is frequent.
Mini-LED & Transflective Hybrid Polarizers
Sunlight readability traditionally relied on running backlights at high currents, increasing heat dissipation challenges. Xunrui's advanced 4-inch display roadmap introduces local-dimming Mini-LED arrays that slash backlight power consumption by 42% while providing 100,000:1 contrast ratios.
For outdoor battery-powered IoT trackers, transflective polarizing layers utilize incoming solar rays as a supplementary illumination source.
EMI Hardening & Automotive AEC-Q100
High-speed video busses can emit electromagnetic interference (EMI) that disrupts nearby RF, GPS, and LoRa communications. We integrate ITO shielding layers, grounded copper foil backplates, and ferrite bead filtering directly on the custom Flexible Printed Circuit (FPC).
Our automated production lines adhere strictly to AEC-Q100 standards, validating cold-crank operating thresholds from -30°C to +85°C.
In-Cell / On-Cell PCAP Optical Bonding
Air-gap lamination results in two internal reflective interfaces that cause a 9% loss of transmitted luminous flux and invite internal condensation. Xunrui leverages Liquid Optical Clear Adhesive (LOCA) and solid OCA optical bonding in Class 1,000 cleanrooms.
Bonding index-matches the cover glass (n ≈ 1.51) to the polarizer, yielding superior contrast, zero dust entrapment, and high shock resistance.
| Architecture Parameter | Standard Commercial Grade | Xunrui Custom 4" Industrial IPS | Outdoor Ultra-High Brightness Series |
|---|---|---|---|
| Active Display Size | 3.97" / 4.0" Diagonal | 3.95" / 4.0" / 4.3" Customized Form Factors | 4.0" Square / Vertical / Bar Available |
| Resolution & Aspect Ratio | 480×480 (1:1) / 480×800 (16:9.6) | Up to 720×720 (Square) / 480×854 (MIPI) | 480×800 High PPI Portrait Matrix |
| Luminance (Nits / cd/m²) | 250 – 350 Nits | 450 – 800 Nits (PWM Controlled) | 1,000 – 1,500+ Nits (Sunlight Legible) |
| Viewing Angle (CR ≥ 10) | TN (60/60/50/55) | Full IPS (85/85/85/85 All-Direction) | Full IPS with Circular Polarizer Option |
| Electrical Interface | RGB 24-bit / MCU 8-bit | 3/4-Wire SPI, MCU 8/16-bit, MIPI-DSI 2-Lane | MIPI-DSI, RGB 24-bit, LVDS via Adapter Board |
| Operating Temperature | -10°C to +60°C | -20°C to +70°C (Industrial Specification) | -30°C to +85°C (Automotive / Mil Grade) |
| Touch Sensor Technology | Separate Air-Bonded RTP | Custom Projected Capacitive (FocalTech/Goodix) | Full Optical OCA Bonding + 3.0mm AR/AG Glass |
China Factory 4.0: Supply Chain Resilience & Xunrui Capabilities
Located in Bao'an District, Shenzhen, our 5,000 square meter manufacturing center couples automated precision assembly with multi-tier supplier partnerships to safeguard long-term production runs.
Automated COG + FOG Cleanrooms
Our Class 1,000 cleanroom lines utilize fully automated Chip-on-Glass (COG) and Film-on-Glass (FOG) thermo-compression bonding systems. High-precision vision alignment maintains bonding positional tolerance within ±3μm, ensuring low contact resistance and maximum long-term interconnect reliability.
The 5-Gate Total Quality Framework
Quality control is woven into every production stage: (1) IQC incoming raw material screening, (2) Cleanroom glass polarimetry inspection, (3) Post-FOG electrical functional test paired with 24-hour high-temp dynamic burn-in, (4) Finished module 48-hour thermal chamber stress aging, and (5) Strict OQC MIL-STD-105E sampling before vacuum-seal packaging.
Upstream Glass Foundry Tier-1 Consortia
Through strategic tier-1 wafer and mother-glass procurement allocations with BOE, HannStar, Innolux, and IVO, Xunrui shields international OEM buyers from raw glass allocation crises. We stock standardized backplane substrates to ensure steady, predictable production schedules even during supply constraints.
Flexible Pilot-to-Volume Scalability
We eliminate high minimum order entry barriers. Xunrui supports OEM innovators with a formal 5 to 500 pcs small-batch trial protocol following drawing validation and Golden Sample sign-off. Once verified on your pilot production lines, customized mass manufacturing scales smoothly at an MOQ of 1,000 units.
Macro Industry Applications for 4" TFT Modules
Every industry subjects displays to unique operational stresses. Discover how Xunrui tailors glass chemical strengthening, touch IC firmware tuning, and interface boards for vertical market deployments.
Smart HVAC & Rotary Knob Thermostats
Smart thermostats and home automation consoles frequently adopt 4-inch square (480×480) or circular displays mounted inside metallic rotary knobs. Xunrui crafts circular cover glasses with precision edge beveling and optical rotary encoder pass-throughs, pairing simple SPI/MCU interfaces with ESP32 or STM32 platforms.
Industrial Handheld Terminals & Meters
Warehouse barcode scanners, multimeter consoles, and portable gas detectors demand drop-proof durability and non-reflective visibility under fluctuating warehouse warehouse high-bay lights. We integrate 4" portrait IPS panels (480×800) with IK07 shatter-resistant chemically strengthened cover plates and glove-friendly touch controllers.
Medical Diagnostics & Patient Infusion Pumps
Bedside telemetry units, infusion pumps, and portable ultrasound controllers require pristine optical clarity and resistance to rigorous chemical wipe-downs. Our medical-tier 4" PCAP assemblies support clinical alcohol, bleach, and Betadine resistance without optical hazing or capacitive false-triggering.
EV Charging Stations & Automotive Sub-Displays
Commercial DC fast chargers and automotive steering column displays must endure continuous thermal cycling (-30°C to +85°C) and solar radiation. Xunrui supplies 1200+ nit high-brightness 4-inch modules featuring UV-blocking polarizers that prevent liquid crystal degradation and optical bubbling.
Global Procurement, Obsolescence Management & Compliance
Sourcing custom display sub-assemblies requires confidence in engineering documentation, supply continuity, and international regulatory adherence.
5-to-7 Year Lifecycle Longevity
Industrial, medical, and automotive programs involve multi-year qualification cycles. A sudden End-of-Life (EOL) notice from a component vendor can force expensive PCB redesigns. Xunrui offers locked BOM guarantees and guaranteed 5-to-7 year active production longevity with at least 6 months prior notification.
RoHS, REACH & ISO Certification
All display components supplied by Xunrui are 100% compliant with EU RoHS Directives (2011/65/EU and 2015/863) and REACH (EC 1907/2006) regulations. Our manufacturing facility operates under audited ISO 9001 (Quality Management) and ISO 14001 (Environmental Management) certifications, backed by comprehensive test reports.
Custom Driver Boards & HDMI Adapters
To accelerate prototyping on Raspberry Pi, x86 embedded computers, and Android SOM gateways, Xunrui designs and manufactures matched HDMI, Type-C, and USB touch bridge boards. Our hardware engineers provide initialization timing code, register settings, and pin-out adaptation to streamline bring-up.
Bilingual Field Engineering Support
Hardware developers work directly with factory-based optoelectronic engineers fluent in English and Chinese. We review enclosure 3D STEP files, flex cable bend-radius clearances, and connector footprints during the initial RFQ stage, preempting assembly interferences before prototype production.
Frequently Asked Technical & Procurement Questions
Answers to common inquiries raised by electrical engineers, embedded systems architects, and sourcing managers.
Industrial Displays & Touch Sub-Assemblies
Complete your embedded hardware architecture with our broad portfolio of standard, bar, vertical, and custom touch-integrated display modules.
