What are the effects of industrial LCD exceeding their operating temperature ran
Date:2025-10-31
Operating industrial LCD screens outside their designated operating temperature range can cause a series of problems, ranging from temporary performance degradation to permanent hardware damage.
Simply put, low temperature mainly affects the physical response of liquid crystal materials, while high temperature directly threatens the lifespan of electronic components and the stability of chemical materials.
The following are the specific impacts that may occur when the operating temperature range is exceeded:
When the temperature is too low (below the minimum operating temperature)
Extremely slow response speed, appearance of "ghosting" or "residual shadows"
Reason: Liquid crystal is a substance between liquid and crystal. At low temperatures, its viscosity increases and becomes as viscous as syrup, preventing molecules from rapidly flipping under the action of an electric field.
Phenomenon: There will be severe ghosting during screen switching, dynamic images cannot be displayed normally, and the touch operation feels extremely laggy.
Reduced brightness, decreased contrast, and even black screen
Reason: The fluorescent powder in LED backlight will reduce its luminous efficiency at low temperatures. At the same time, the optical properties of liquid crystals themselves will also change.
Phenomenon: The screen appears dim and gray, and may not light up at all at extremely low temperatures. Because the backlight or driver circuit cannot start at all.
Physical damage
Reason: The shrinkage coefficient of different materials inside the screen (such as glass, metal, plastic) varies. Under rapid temperature changes, this uneven shrinkage will generate internal stress.
Phenomenon: It may cause cracks in polarizing film, glass substrate, or internal bonding cables, resulting in permanent and irreparable bright spots, dark spots, or lines.
When the temperature is too high (above the maximum operating temperature)
Yellowing display and appearance of "white screen"
Reason: The core materials that make up the screen - polarizing film and optical adhesive - are organic compounds, and long-term high temperature or instantaneous ultra-high temperature can cause them to age and carbonize.
Phenomenon: The overall color of the screen is yellowish, like a piece of white paper being burnt. In severe cases, it may completely lose its display ability and turn into a "white screen".
Sudden decrease in brightness and rapid decay of backlight
Reason: LED backlight is one of the main heat sources for screens and also a heat sensitive component. For every 10 ℃ increase in junction temperature (core temperature of LED chips), its light decay life may be halved.
Phenomenon: The screen brightness significantly decreases in the short term, and this attenuation is irreversible.
Color distortion, garbled text or blurred screen
Reason: Semiconductor components on the driver chip (IC) and timing control board (T-Con) may malfunction and even trigger internal protection mechanisms when overheated.
Phenomenon: The color display is abnormal, with flickering, stripes, or cluttered color blocks appearing on the screen.
Permanent damage to electronic components
Reason: High temperature can accelerate the aging of electrolytic capacitors and other components, and may lead to virtual soldering or desoldering of chips or solder joints due to thermal stress.
Phenomenon: The screen is completely malfunctioning and requires replacement of the entire driver board or screen module.
How to avoid these problems?
Accurate selection: Based on the harshest temperature of your application environment (including the internal temperature of the chassis under summer exposure and the lowest temperature during winter cold start), choose a wide temperature screen with sufficient margin in the working temperature range.
Consider auxiliary equipment:
For low-temperature environments: LCD screens with heating films can be optionally selected to automatically heat the screen before startup or at low temperatures.
For high-temperature environments: Ensure good ventilation of the equipment, and if necessary, add heat sinks, cooling fans, or even semiconductor coolers to the screen.
Standardized operation: Strictly follow the recommendations of the equipment manufacturer regarding startup, shutdown, and ambient temperature.
Core summary: Operating industrial LCD screens within the rated temperature range is the foundation for ensuring their display performance, stability, and service life. Beyond this range, it is actually overdrawing the life of the equipment and bearing the risk of possible malfunctions at any time.
