What is an explosion-proof LCD screen and where is it mainly used?
Date:2025-03-07
Explosion proof LCD screen: the "eye of safety" in high-risk environments
In the fields of petrochemicals, mining, aerospace, etc., extreme environments such as high temperature, high pressure, flammable and explosive gases pose severe challenges to the stability of electronic equipment. As the core carrier of human-computer interaction, ordinary display screens may cause catastrophic consequences if they explode due to electric sparks or high temperatures. Explosion proof LCD screens are specialized industrial equipment designed to address this pain point. Through material innovation and structural reconstruction, they elevate safety performance to a whole new dimension.
1、 Explosion proof principle: from passive protection to active suppression
Explosion proof LCD screens are not simply reinforced with outer shells, but eliminate explosion risks through multiple technological means: intrinsic safety circuit design;
Using low-power chips and current limiting resistors to ensure that the maximum operating current of the circuit is lower than the minimum ignition current of combustible gases (such as methane at 0.28mJ); Set up isolation barriers between key modules to block the arc transmission path.
Pressure vessel type structural protection (Ex d standard)
The shell is made of cast aluminum/stainless steel material, and the joints are designed with serrated explosion-proof surfaces. When there is an internal explosion, the flame path is extended to achieve cooling;
Double layered tempered glass combined with sealant can withstand instantaneous impact forces of over 50J (ordinary screens only have 5-10J).
Temperature control system
Built in temperature sensor and heat dissipation fins, the surface temperature is always below T6 level (85 ℃);
Liquid crystal molecules can still maintain normal deflection in an environment of -40 ℃ to+70 ℃, avoiding low temperature hysteresis or high temperature leakage.
2、Core technology breakthrough
Full lamination explosion-proof process
The liquid crystal layer, touch layer, and protective glass are seamlessly bonded together using OCA optical adhesive, eliminating air layers to reduce light refraction interference and enhance impact resistance (able to withstand level 6 vibration testing).
Electromagnetic compatibility (EMC) optimization
The circuit board is covered with a copper foil shielding layer and certified according to the GB3836.4-2010 standard;
There is still no screen flickering phenomenon near strong interference sources such as frequency converters and high-voltage motors (testing shows that the anti-interference degree reaches 10V/m).
Intrinsically Safe Touch Control Solution
The capacitive touch electrode adopts ITO coating, and the driving voltage is ≤ 5V (traditional scheme is 12-24V);
Supports wearing thick gloves for operation (sensitivity can recognize 3mm compartments).
3.Typical application scenarios and value
Industry | Application scenarios | Explosion proof requirements | Technical Proposal |
petrochemical industry | Refinery control room, tank area monitoring | Ex dIIB T4 (explosion-proof grade) | Stainless steel casing+intrinsic safety power supply |
underground coal mine | Comprehensive color surface equipment control console | ExiblMb (mining intrinsic safety type) | Fully enclosed structure+anti dust coating |
aerospace | Fuel injection system human-machine interface | ATEX Zone 1 certification | Redundant circuit+hydrogen environment compatible design |
Pharmaceutical manufacturing | Explosion proof clean room | IP69K protection+dust-free sealing | Airtight sealant+stainless steel frame |
4、 Selection Guide: Key Parameters and Misunderstandings Avoidance
Core Indicators
1. Explosion proof certification level
Gas environment: Ex d (explosion-proof type)/Ex e (increased safety type)/Ex ia (intrinsic safety type)
Dust environment: DIP A21 TA, T6
International standards: ATEX、IECEx、UL 1203
2. Optical performance
Brightness ≥ 1000cd/m ² (2000cd/m ² is required for underground scenes)
Contrast ratio ≥ 1500:1 (visibility guarantee under strong light)
3. Mechanical strength
Impact resistance: IK10 grade (5kg steel ball falls from 1m without damage)
Seismic resistance: Complies with EN 60068-2-6 standard (5~500Hz sweep test)
Common Misconceptions
Misconception 1: "Explosion proof=Waterproof and Dustproof"
Actual distinction needs to be made: Explosion proof certification is for explosive environments,
while IP protection is for water and dust intrusion, and both need to meet the standards simultaneously.
Misconception 2: "The thicker the shell, the safer it is"
Excessive thickening of the casing may affect heat dissipation, and it is necessary to optimize the structural
strength and thermal balance through finite element analysis.
The evolution history of explosion-proof LCD screens is essentially a leap in industrial safety concepts from
"passive risk tolerance" to "active elimination of hidden dangers". Under the wave of Industry 4.0 and intelligent
manufacturing, explosion-proof screens are upgrading from a single display terminal to an intelligent node that
integrates safety monitoring, data analysis, and emergency response. For high-risk industries, choosing an
explosion-proof screen that is suitable for the scene is not only related to production efficiency, but also a solemn
commitment to life safety.
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