4.96" In-Cell IPS High-Definition Display Touch All-in-One Module

2026 Global Market Certified Technical Whitepaper

‌Published by Shenzhen Tianxianwei Technology Co., Ltd.

‌
Release Date: April 29, 2026
Full production line certified lead-free and RoHS compliant, designed for premium consumer portable electronics, smart home control panels and mid-tier industrial HMI terminals across North America, EU and Southeast Asian markets.

1. Core System Architecture Design

This 4.96-inch integrated in-cell touch IPS display module adopts a 720*RGB × 1280 high-definition portrait pixel array, with all display and touch processing logic embedded in the single ST7121P all-in-one driver chip. Eliminating the redundant stacked layer of traditional external CTP structures, the module achieves ultra-thin body performance while reducing inter-layer light loss by 12% compared to similar products on the market.

The optical path follows a transmissive normally black active matrix driving architecture, with RGB stripe orthogonally arranged pixels. A built-in 10-bit Gamma correction engine supports 16.7 million full-color gamut rendering, paired with a 4-lane MIPI D-PHY high-speed differential interface to achieve 80/80/80/80 four-direction full viewing angle performance with ΔE < 2 color deviation, no color washout or brightness shift when viewed from any tilted angle.

The full LCM body measures only 63.88mm wide, 117.17mm high and 1.56mm thick, with critical assembly dimensions tightly controlled within ±0.15mm tolerance. When assembled with the 1.10mm thick AG tempered glass cover, the total stack thickness reaches 2.84mm, with a total outline dimension of 67.00mm wide and 126.00mm high. The unspecified general structure tolerance uniformly converges to ±0.2mm, and the 61.776mm × 109.824mm effective display area is matched with a recommended touch cover window that extends 0.3mm to 0.5mm unilaterally to eliminate edge touch blind zones, and the printing area on the back of the cover adopts a matte black silk-screen process to avoid stray light reflection interference.

The cover glass is made of AGC Asahi tempered glass, with a light transmittance of no less than 85% and a surface hardness of no less than 6H, which can resist daily scratch wear of common metal objects such as keys and alloy pen tips.

2. Full Working Condition Boundary Calibration

The device has completed strict environmental stress screening verification. The power-on operating temperature range of the LCM body covers -20°C to +70°C, and the non-powered long-term storage temperature tolerance range extends from -30°C to +80°C. The full machine with tempered glass cover can maintain stable touch sampling at a 120Hz reporting rate under 20%RH to 90%RH non-condensing humidity environment, and the storage temperature and humidity tolerance boundary is fully aligned with the main body of the display, adapting to the use and storage requirements of outdoor handheld devices in extreme temperature difference regions such as Northern Europe and North America.

3. Multi-Rail Electrical Performance Index

The I/O power supply domain of the module supports adaptive voltage input from 1.8V to 3.3V, with the default typical working level set to 1.8V. The independent DC/DC boost circuit has a dedicated external power input pin, with a supply voltage range of 2.8V to 3.3V and a typical value of 3.3V, which avoids the system power supply fluctuation risk caused by the main display power rail sharing with other peripheral components.

The edge-lit backlight unit is built with 12 high CRI white LEDs, with the forward conduction voltage range covering 16.8V to 19.2V, and the typical rated operating current of a single string is 40mA. The typical brightness of the whole machine with LCD and tempered glass cover reaches 300cd/m², the minimum brightness uniformity of the backlight surface is no less than 80%, and the nominal service life of the LED defined in the specification is 30,000 hours, which refers to the continuous operation time when the brightness of the whole machine attenuates to 50% of the initial value under the condition that the single LED is driven at a constant current of 20mA. If it runs for a long time under the overload condition that the current of a single LED exceeds 25mA, the actual mean time between failures of the backlight will decrease non-linearly.

4. FPC Signal Pin Definition

The 30-pin flexible printed circuit of the module adopts gold-plated finger process with anti-oxidation treatment, and the impedance of all high-speed differential signal pairs is precisely matched to 100Ω differential impedance, eliminating signal reflection loss. Each pin function is strictly defined as follows:

1. Pin 1 is the backlight anode power supply terminal
2. Pin 2 and Pin 3 are two independent backlight cathode power terminals
3. Pin 4 is the 3.3V dedicated DC/DC circuit power supply terminal
4. Pin 5 is the 1.8V I/O domain main power supply terminal
5. Pin 6 is the 1.8V global hardware reset pin with active low level
6. Pin 7, Pin 8, Pin 29 and Pin 30 are all no-connection reserved pins
7. Pin 9, Pin 12, Pin 15, Pin 18, Pin 21 and Pin 24 are independent power ground isolation terminals, which are set between each group of differential signals to suppress inter-channel crosstalk
8. Pins 10 to 23 correspond to 4 groups of MIPI high-speed differential data pairs and 1 group of differential clock pairs respectively, following the MIPI D-PHY standard electrical specification
9. Pin 25 is the 1.8V touch interrupt open-drain output pin
10. Pin 26 is the 1.8V I2C touch serial data pin
11. Pin 27 is the 1.8V I2C touch serial clock pin
12. Pin 28 is the 1.8V touch hardware reset pin

The FPC is designed with 0.15mm thick steel sheet reinforcement at the main component placement area, which avoids the hidden danger of solder joint cracking caused by repeated plugging and bending, and the EMI design around the driving IC effectively suppresses high-frequency electromagnetic radiation, meeting the strict EMC requirements of the EU and North American consumer electronics certification.

5. Reliability Verification Standard System

All test items in this product have passed the full industrial-grade reliability verification, and the uniform qualification standard is that the full function remains normal after the test. No failure modes such as missing pixels, driving short circuit, blurry display, no display, abnormal color deviation and liquid crystal leakage are allowed, and no structural defects such as low-temperature bubbles in the liquid crystal layer, peeling of the edge sealant and rainbow patterns between stacked layers are permitted.

The specific test execution conditions fully comply with the IPC industry display device test specification:

1. High temperature storage test: the whole machine is kept static for 96 consecutive hours at a constant temperature of +70°C
2. Low temperature storage test: the whole machine is kept static for 96 consecutive hours at a constant temperature of -30°C
3. High temperature power-on operation test: the whole machine continuously lights up and runs at full frame for 96 hours at a constant temperature of +60°C
4. Low temperature power-on operation test: the whole machine continuously lights up and runs at full frame for 96 hours at a constant temperature of -20°C
5. High temperature and high humidity steady-state storage test: the whole machine is kept static for 96 consecutive hours in the environment of 50°C / 90%RH non-condensing
6. Thermal cold shock test: under non-powered static state, complete 10 cycle switches in the temperature range of -20°C (dwell for 30 minutes) to +60°C (dwell for 30 minutes)
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6. Global Market Access Compliance Package

This product fully meets the mainstream regulatory requirements of major overseas markets: it complies with EU RoHS 2.0 and REACH SVHC substance control standards, and the packaging materials are 100% recyclable to meet the WEEE recycling directive. It fully passes FCC Part 15B unintentional radiation test for North American market entry, and the EMC performance meets EN 55032 and EN 55035 standards to get CE qualification. The product belongs to EAR99 non-export controlled category, with HS code 85285211, which does not require additional license approval for ordinary import customs clearance in most countries around the world, and can provide full set of English certification documents, test reports and traceable supply chain statement forms for overseas B-end customers.