Ultrasonic Flaw Detector LCD Screen Selection Scheme – AU Optronics G057QN01 V2 and G057VN01 V2
News 2026-05-14
The Stringent Requirements of Industrial LCD Screens for Ultrasonic Flaw Detectors
Ultrasonic flaw detectors (UT/Flaw Detectors) are core equipment in the field of non-destructive testing, widely used in pressure vessel weld inspection, rail transit wheel and axle flaw detection, aerospace composite material screening, and petrochemical pipeline inspection. Their display screens, as the sole window for waveform interpretation and human-machine interaction, must remain reliable under the following extreme conditions:
High Brightness and Visibility: Outdoor operations often involve direct sunlight; the screen must have high brightness (≥500 cd/m²) and an anti-glare surface to ensure clear A-Scan/B-Scan waveforms.
Wide Temperature Range Operation: From railway maintenance in frigid regions down to -30°C to high-temperature refining workshops, the LCD module must start normally, without ghosting or color distortion, within a wide temperature range.
High Contrast and Fast Response: Ultrasonic waveforms are mostly grayscale signals; high contrast helps distinguish echoes from minute defects; fast response time avoids ghosting during dynamic scanning.
Long lifespan and low power consumption: Portable outdoor devices require a backlight lifespan of ≥50,000 hours and low overall power consumption to extend battery life.
Mechanical reliability: Frequent handling and on-site vibration require modules with industrial-grade vibration-resistant structures and standardized mounting holes.
AU Optronics’ (AUO) 5.7-inch industrial LCD modules G057VN01 V2 (VGA high brightness wide temperature version) and G057QN01 V2 (QVGA high brightness economy version) are classic display solutions designed to meet these requirements.
G057VN01 V2: VGA High Brightness Wide Temperature Flagship Solution
Product Positioning
The G057VN01 V2 is AUO’s benchmark model among 5.7-inch industrial displays. It adopts a-Si TFT-LCD technology, integrates NT39207 + AU39413H-D driver ICs, and integrates a WLED backlight driver. It is designed for high-end portable testing instruments and outdoor industrial HMIs.
Core advantages
700 cd/m² high brightness + matte anti-glare finish ensures crystal-clear waveforms outdoors.
Typical brightness reaches 700 cd/m², far exceeding the 250~300 cd/m² of consumer-grade screens; combined with a matte (anti-glare) + 3H hardened coating surface treatment, it effectively suppresses reflections from sunlight and ambient lighting.
In outdoor flaw detector operation scenarios, the high brightness ensures clear readability of A-Scan waveform peaks, DAC curves, and defect echo signals, reducing the risk of missed detections.
-30℃ ~ +85℃ ultra-wide temperature range, stable operation in extreme cold and heat.
Operating temperature: -30℃ ~ 85℃, storage temperature range is the same, verified through low-temperature cold start and high-temperature continuous operation.
In scenarios such as railway flaw detection in winter and petrochemical plant inspection in summer, the liquid crystal viscosity changes little, contrast decrease is less than 8%, and waveform display consistency is high.
VGA resolution (640×480) for precise rendering of defect details
640(RGB)×480 pixels, 141 PPI, classic 4:3 aspect ratio, perfectly matching the UI layout of most traditional ultrasonic flaw detectors.
High pixel density ensures sharp edges on fine defect echoes, measurement grids, and digital readings, improving flaw detection accuracy.
50,000-hour backlight lifespan, reducing total lifecycle costs
Edge-lit WLED backlight with a typical lifespan of >50,000 hours (approximately 5.7 years of continuous operation), featuring a built-in constant current LED driver, simplifying external circuitry.
The backlight module is replaceable independently; after brightness decay, the entire screen does not need to be scrapped, significantly reducing maintenance costs.
Industrial-grade mechanical structure and electromagnetic compatibility.
The reinforced metal frame design provides vibration resistance up to 1.5G (14.7 m/s²), passing transportation vibration and field impact tests.
Supports up/down and left/right flip display, allowing engineers to flexibly adjust the installation direction according to the flaw detector’s housing structure and directly correct images via commands.
G057QN01 V2: Economical alternative for QVGA high-brightness displays
Product Positioning
The G057QN01 V2 is also an AUO 5.7-inch industrial-grade high-brightness module, featuring a 320×240 (QVGA) resolution. While maintaining high brightness and industrial reliability, it provides a more cost-effective display option, suitable for mid-to-low-end flaw detectors or old equipment upgrade projects with relatively relaxed resolution requirements and budget sensitivity.
Core Advantages
Classic QVGA Resolution, Compatible with Legacy Systems
320×240 resolution was the standard for early ultrasonic flaw detectors, industrial oscilloscopes, and portable testing instruments. It can directly replace existing legacy displays without rewriting the underlying GUI driver, shortening the modification cycle.
Strong Interface and Installation Compatibility
Using standard industrial interfaces and mounting holes, it is easy to embed into the aluminum alloy flaw detector housing and interface with mainstream MCU/FPGA driver solutions, lowering the development threshold.
High-Brightness Backlight, Equal Outdoor Visibility
As a high-brightness model, the G057QN01 V2 also features a high-brightness backlight system (specific values are subject to the latest specifications), meeting basic visibility requirements in outdoor and strong light environments.
Technical parameters comparison of the two models
| Specifications | G057VN01 V2 | G057QN01 V2 |
| Panel Size | 5.7 inches | 5.7 inches |
| Resolution | 640×480 (VGA) | 320×240 (QVGA) |
| Display Area | 115.2×86.4 mm | Approx. 115×86 mm (Typ.) |
| Brightness | 700 cd/m² (Typ.) | 800 cd/m2 |
| Contrast Ratio | 800:1 (Typ.) | 800:1 |
| Viewing Angle | 80/80/70/70 (CR≥10) | Typ.(70/70/80/80 |
| Display Colors | 262K (6-bit) | 262K colors |
| Operating Temperature | -30℃ ~ 85℃ | -30℃ ~ 85℃ |
| Storage Temperature | -30℃ ~ 85℃ | -30℃ ~ 85℃ |
| Backlight Type | WLED, Side-lit, with Driver | WLED, with Driver |
Recommendations for Integrated Solutions for Ultrasonic Flaw Detectors
Waveform Display Optimization
The core interface of the ultrasonic flaw detector is the A-Scan (amplitude-time) waveform, which is sensitive to grayscale levels and contrast. Recommendations:
Use the 800:1 high contrast version of G057VN01 V2 to ensure clear separation between the echo of small defects and the noise substrate;
Enable inverted colors or high-contrast waveform color schemes in the software layer to fully utilize the black background performance of the TN constant white mode.
Enhanced Outdoor Readability
If the flaw detector needs to be used frequently in direct sunlight, a circular polarizer or optically enhanced light filter (DBEF) can be attached to the surface of the G057VN01 V2 to further suppress ambient light reflection;
Use a light sensor to achieve automatic brightness adjustment and extend battery life.
Wide Temperature Start-up and Thermal Management
When starting in extremely cold environments (-30℃), it is recommended to add low-temperature delay startup logic to the motherboard program (delaying for 2-3 seconds until the backlight stabilizes before outputting the waveform);
In high-temperature environments, the metal casing of the flaw detector can act as a heat sink, dissipating heat from the back of the module through thermally conductive silicone pads to ensure the LED junction temperature is << 85℃.
Touch Expansion (Optional)
Neither module itself has a touch layer. If parameter touch input is required on the flaw detector, an industrial-grade resistive or capacitive touchscreen (supporting operation while wearing gloves) can be externally attached, communicating with the main controller via USB/I²C.
FAQ
Can the QVGA (320×240) G057QN01 V2 meet the display requirements of modern ultrasonic flaw detectors?
A: For mid-to-low-end portable flaw detectors that primarily use A-Scan waveform interpretation and have simple menu structures, QVGA resolution is sufficient, and it is also lower in cost and simpler to drive. If high-pixel-density B-Scan imaging, TOFD maps, or complex UIs are required, then the VGA resolution G057VN01 V2/V220 is recommended.
Is 700 cd/m² brightness sufficient in strong outdoor light?
A: For close-range handheld operation (viewing distance 30~50 cm), 700 cd/m² combined with a matte anti-glare treatment provides good readability. If the operating environment is under extremely strong direct light (such as deserts or snowfields), consider adding an optical brightness enhancement film to the front of the module or using a custom backlight solution with higher brightness.
Do these two modules support battery-powered portable flaw detectors?
A: Yes. The G057VN01 V2 has a typical power consumption of approximately 3.37~3.74W, while the G057QN01 V2 has even lower power consumption and is suitable for powering 12V lithium battery packs or 3.7V boost systems. It is recommended to separate the backlight driver from the logic power supply circuit and use PWM dimming (200Hz~20kHz) to dynamically adjust brightness to save energy.
Available Supporting Services
We offer complete display solutions:
Original LCD Screens
Capacitive/Resistive Touchscreens
Custom Driver Boards
Sunlight Visibility Upgrades
Optical Bonding
Cover Glass
EMC Optimization
Summary
For ultrasonic flaw detectors, the clarity and reliability of the display screen directly affect testing efficiency and result interpretation.
AUO G057QN01 V2: A cost-effective solution suitable for basic flaw detection equipment.
AUO G057VN01 V2: A high-resolution solution suitable for high-end ultrasonic testing instruments.
If you are developing or upgrading ultrasonic flaw detection equipment, please contact us at market@leehon.com for:
Datasheet
Sample Support
Pricing Options
Custom Display Solutions
