What TFT LCD sizes does XUNRUI manufacture?

We produce TFT LCD modules from 0.96 inch to 27 inch. The most requested sizes are 1.8, 2.1, 3.5, 4.3, 5.0, 5.5, 7.0, 8.0, 9.0, 10.1, 11.6, 13.3 and 15.6 inch, in standard, round, bar and square formats.

What is the MOQ for a customized TFT LCD project?

After sample approval we offer a one-time small-batch trial run of 5 to 500 units to validate mass-production feasibility. Customized mass production then requires a minimum order quantity of over 1,000 units.

Which parameters of a TFT display can be customized?

Size, module thickness, backlight brightness, FPC flat cable length and pin-out, interface type, and touch panel size and shape can all be customized. We also supply capacitive and resistive touch panels, AV/VGA/HDMI/LVDS driver boards, adapter boards and glass cover plates.

How does XUNRUI control TFT LCD quality?

Every batch passes IQC incoming inspection, glass inspection, FOG inspection with aging, finished-product inspection with aging, and OQC outgoing inspection before shipment. Our management system is certified to ISO 9001 and ISO 14001.

Should I choose a capacitive or resistive touch TFT LCD?

Capacitive touch suits consumer-grade, medical and smart-home interfaces that need multi-touch and a glass cover. Resistive touch suits industrial and outdoor equipment operated with gloves or a stylus, or exposed to water droplets and electrical noise.

China 4 TFT LCD Panel Manufacturers & Factory Hub

Whitepaper & Industrial Benchmark: Engineering, supply chain architectures, and micro-display integration protocols across 4-inch category TFT modules and multi-touch HMI assemblies.

Optical Components & Display Lineup

Precision TFT Displays & Industrial Assemblies

Explore engineering-grade micro-to-medium modules manufactured in our Shenzhen cleanrooms, supporting SPI, RGB, MCU, and MIPI standards.

Custom 2 inch 480x240 RGB 40pin 150nit TN TFT LCD Display

Custom 2 inch 480×240 RGB 40pin 150nit TN TFT LCD Display

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Custom 1.77 inch 128x160 SPI 14pin 250nit TN TFT LCD Module

Custom 1.77 inch 128×160 SPI 14pin 250nit TN TFT LCD Module

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China 2 inch 240x320 SPI 30PIN 250nit IPS TFT LCD Module

China 2 inch 240×320 SPI 30PIN 250nit IPS TFT LCD Module

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Custom 2 inch 176x220 MCU 45pin interface 220nit TN TFT LCD Module

Custom 2 inch 176×220 MCU 45pin 220nit TN TFT LCD Module

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China 4.3 inch vertical screen 480x800 RGB 40pin IPS TFT LCD Display

China 4.3 inch vertical screen 480×800 RGB 40pin IPS Display

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China 2.8 inch 480x640 MIPI RGB IPS TFT LCD Display

China 2.8 inch 480×640 MIPI/RGB IPS TFT LCD with PCAP Touch

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Custom 4.3 inch 480x272 MCU SPI 40pin 350nit TN TFT LCD Display

Custom 4.3 inch 480×272 MCU/SPI 40pin 350nit TN TFT LCD Display

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Custom 2.8 inch 240x320 SPI 10pin 250nit TN TFT LCD Display

Custom 2.8 inch 240×320 SPI 10pin 250nit TN TFT LCD Display

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Technical Architecture

Engineering Anatomy of the 4" Display Tier

A rigorous examination of optical stacks, crystal orientation modes, and signal topologies dominating modern embedded interfaces.

IPS vs. TN Liquid Crystal Topologies

The 4-inch display sector (encompassing 3.5", 3.97", 4.0", and 4.3" footprints) has transitioned from legacy Twisted Nematic (TN) to In-Plane Switching (IPS). While TN remains cost-efficient for fixed-angle meters, IPS panels eliminate grayscale inversion, maintaining an 80/80/80/80 degree viewing cone critical for off-axis medical and diagnostic monitors.

TN: Response times ~10-16ms, budget-conscious setups.
IPS: True chromatic consistency, high color gamut (72% NTSC).
Anti-Glare Coating: 3H surface hardness standard against industrial abrasions.

Signal Interface Protocols

Microcontroller computational overhead dictates interface selection. China's manufacturing clusters excel in producing standard and hybrid flexible printed circuits (FPC) to match diverse host controller constraints.

RGB 24-bit: High-refresh applications (60fps) requiring dedicated framebuffers.
SPI (3/4-wire): Pin-saving interfaces optimized for low-power microcontrollers (ESP32, STM32).
MIPI DSI: Ultra-compact differential signaling minimizing EMI emissions in handheld IoT systems.
MCU 8080/6800: Direct parallel memory mapped routing for legacy systems.

Optically Bonded Touch Sensors

Modern 4-inch display integrations require unified Touch Display Module (TDM) packaging. Through advanced cleanroom bonding, factories merge TFT cells with capacitive (PCAP) or resistive (RTP) overlays.

Optical Clear Resin (LOCA/OCA): Refractive index matching (n=1.49) eliminates internal air gaps.
Reflectance Suppression: Sunlight readability jumps by 300% without increasing backlight draw.
Glove & Water Rejection: Tuning specialized touch controller ICs (e.g., FocalTech, Goodix) for extreme wet environments.

Supply Chain Supremacy

Why Tier-1 OEMs Source TFT Panels Direct from China

The concentration of open-cell foundries, FOG automation, and optical testing in the Greater Bay Area provides unprecedented supply chain elasticity.

FOG Cleanroom Automation

Film-On-Glass (FOG) and Chip-On-Glass (COG) bonding lines operate at sub-micron alignment tolerances, achieving over 99.2% line yield on intricate fine-pitch pin-outs.

Raw Glass Allocation

Direct partnerships with global glass foundries (BOE, HannStar, Tianma, IVO) guarantee steady parent-sheet supply, isolating downstream clients from international component panics.

Rapid FPC Prototyping

Custom tail routings, EMI gold foil shielding, and bespoke board-to-board connector designs transition from CAD drawings to fully verifiable samples within 7-10 business days.

Total Cost Optimization

Vertical integration across backlight mold cutting, SMT driver manufacturing, and cover lens silkscreening removes intermediary markups, slashing Bill-of-Materials cost by up to 28%.

2,000,000+

Monthly Module Output (Units)

5,000 m²

Class 1,000 / 10,000 Cleanrooms

5-Stage

Rigorous Quality Gateways

10+ Years

Engineering Longevity Guarantee

Compliance & Reliability

Engineering Verification, Quality Systems & Global Compliance

Overseas procurement teams require zero operational risk. We anchor every mass production batch in verifiable international certifications and traceable batch QA.

ISO 9001 & ISO 14001 Control

Our quality lifecycle follows strict closed-loop Deming (PDCA) procedures. We enforce Incoming Quality Control (IQC) on glass substrates and driver ICs, automated optical inspection (AOI) on FOG bonds, high-temperature thermal stress aging, and 100% final testing (OQC) before vacuum containerization.

RoHS, REACH & Conflict Minerals

Global brand integrity demands strict chemical compliance. All polarizers, bonding adhesives, liquid crystal compounds, and solder fluxes comply fully with EU RoHS Directives (EU) 2015/863, REACH SVHC declarations, and Responsible Minerals Initiative (RMI) auditing protocols.

Obsolescence & EOL Roadmapping

Industrial builds face development cycles of 3-5 years and deployment spans over 7 years. We mitigate EOL (End-of-Life) risks by architecting pin-compatible IC drop-ins, providing 6-12 months Last-Time-Buy (LTB) notifications, and maintaining reserve wafer stock for mission-critical contracts.

Trends & Applications

Next-Gen Use Cases & Market Dynamics

From outdoor high-lumen avionics to smart home rotary encoders, analyze where 4-inch TFT displays deliver core value.

Smart Rotary Thermostats & Knobs

Circular and squircle 2.1"–4.0" displays integrate seamlessly into smart appliance dials. Operating with embedded SPI controllers, these screens provide crisp 480×480 resolution, smooth animation rendering, and capacitive center-touch control for HVAC automation and premium kitchenware.

EV Charging & Vehicle Instrumentation

DC fast-chargers, electric motorcycle dashboards, and golf cart telematics demand sunlight readability. Our 800–1200 nit high-brightness backlights coupled with transflective polarizers and -30°C to +85°C extended temperature crystal fluid withstand baking heat and sub-zero freeze cycles.

Medical Handheld Diagnostics

Ultrasound wands, infusion pumps, and clinical telemetry units require biological fluid immunity and anti-microbial cover glass. Custom cover lenses (0.7mm to 4.0mm chemically strengthened Corning or Asahi glass) endure harsh isopropyl alcohol wipe-downs without optical degradation.

Direct Engineering FAQ

Frequently Addressed Inquiries for 4" TFT Production

Specific, highly technical responses addressing mechanical tolerances, optical tailoring, driver boards, and sourcing constraints.

Q1: What custom tooling parameters are available for a 4.0" / 4.3" display?

Customization spans every layer of the optical stack: FPC routing/pinout reconfiguration, backlight illumination up to 1500 nits via high-efficiency Nichia LEDs, capacitive touch cover glass shape/printing, anti-reflective (AR) and anti-fingerprint (AF) coatings, and custom driver boards supporting HDMI, LVDS, or composite video inputs.

Q2: How do you prevent backlight bleed on high-brightness 4" panels?

We deploy precision CNC-machined metal bezels and light-guide plates (LGP) featuring micro-dot laser engraving. Black light-absorbing tape (0.05mm) seals the boundary between the active area and the frame, preventing stray light egress while maintaining thin module profiles under 3.0mm.

Q3: What is the sample lead time and minimum order quantity (MOQ)?

Standard catalog samples dispatch within 48 hours. Custom FPC or touch sensor prototypes require 2 to 3 weeks. Following sample evaluation, we provide pilot production batches of 5 to 500 units to support customer firmware prototyping. Standard mass-production MOQ starts at 1,000 units.

Q4: Can your 4-inch TFT displays operate in sub-zero outdoor conditions?

Yes. By utilizing specialized wide-temperature liquid crystal fluid, our industrial series reliably functions between -30°C and +80°C. For extreme arctic conditions down to -40°C, transparent ITO heater glass can be laminated directly behind the panel to maintain normal liquid crystal response times without lag.

Q5: What optical bonding technology do you provide for touch assemblies?

We offer both Air-Gap bonding with high-tack 3M double-sided adhesive and full Optical Clear Resin (OCA/LOCA) bonding. Full optical bonding eliminates internal reflection between the cover lens and TFT polarizers, maximizing outdoor readability, mechanical impact resistance (IK08+), and condensation resistance.

Q6: How is intellectual property (IP) and proprietary mechanical design safeguarded?

We routinely sign bilateral Non-Disclosure Agreements (NDAs) subject to international commercial jurisdiction prior to receiving customer STEP or Gerber files. Custom tooling, optical mask designs, and firmware driver codes remain the exclusive proprietary property of the sourcing OEM customer.

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