As a human-machine interaction device in industrial automation control systems, the display accuracy and stability of LCD industrial control screens directly affect production efficiency and operational safety. Due to long-term operation, environmental changes, or physical collisions, industrial control screens may experience color deviation, touch failure, and other issues. Therefore, regular calibration is a key step in ensuring their performance. The following are the operations for calibrating LCD industrial control screens, covering hardware preparation and software settings. 

1. Preparation before calibration 

1.1 Environmental inspection 

Industrial control screens are sensitive to lighting, temperature, and humidity. Before calibration, it is necessary to ensure that the environment meets the following conditions: 

① Environmental temperature: 10 ℃~40 ℃ (avoid direct sunlight or interference from cold and heat sources); 

② Relative humidity: 30%~70% (to prevent static electricity or condensation); 

③ No strong electromagnetic interference (kept away from equipment such as frequency converters and high-power motors). 

1.2 Hardware status confirmation 

① Check if the screen surface is clean and free of scratches or stains (can be wiped with a microfiber cloth); 

② Confirm that the touch layer has no physical damage (such as cracks or bubbles); 

③ The connecting cables (such as LVDS and HDMI interfaces) need to be tightened to avoid abnormal signal transmission. 

1.3 Preparation of Tools and Software 

① Calibration tool: provided specialized stylus (such as pressure touch for resistive screens); 

② Calibration program: pre installed supporting software; 

③ Backup parameters: Record the current display parameters (brightness, contrast, color temperature, etc.) to prevent calibration failure that cannot be restored. 

2. Touch calibration operation steps (taking capacitive screen as an example) 

2.1 Enter calibration mode 

① Activate the calibration interface through the industrial control system backend or a combination of keys; 

② Some systems require selecting the "Touch Calibration" option in the control panel. 

2.2 Target localization calibration 

① The screen will display 5-9 targets in sequence (usually at the center and four corner positions); 

② Use a stylus or finger to accurately click on the bullseye, and the system will automatically record the offset; 

③ Repeat the operation 2-3 times to improve accuracy, and save the data after completion. 

2.3 Linearity Verification 

① Draw diagonal or grid lines to test whether the touch trajectory is continuous without any jumping points; 

② If there is a deviation, it is necessary to recalibrate or check the touch driver version. 

3. Display color calibration process 

3.1 Color gamut and brightness adjustment 

① Connect the color calibration instrument to the LCD industrial control screen; 

② Run calibration software and select industrial grade standards; 

③ Adjust the backlight intensity to 300-500cd/m ² (suitable for factory ambient light) according to the prompts. 

3.2 Gamma Value and White Balance 

① Adjust the Gamma curve to 2.2 (default value) to ensure a natural grayscale transition; 

② Correct white point through RGB gain (target value is usually D65, color temperature 6500K). 

3.3 Save configuration file 

① Export calibration data as an ICC configuration file; 

② Load the file in the industrial control system to avoid parameter loss after restart. 

Through standardized calibration operations, the response accuracy and display consistency of LCD industrial control screens can be significantly improved, extending equipment lifespan. For special industries, professional technicians need to use high-precision instruments for calibration to ensure compliance with industry certification standards.