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Unlike consumer displays that are mainly used for direct viewing, industrial-grade industrial displays may be viewed at suboptimal distances or under less than ideal lighting conditions. Therefore, a display with higher contrast is the best choice. For most industrial computer application, a contrast ratio of 450:1 is ideal for 10.4-inch, 12.1-inch, or 15-inch displays.
Since most flat-panel displays are used indoors, the brightness is typically around 250-300cd/m2 (nits). The 15-inch LCD with a diagonal size is the most commonly used. However, displays with this level of brightness are not suitable for industrial environments, as the ambient lighting is stronger and can easily exceed the brightness of the LCD backlight.
In addition, touch screens are often used in industrial environments, which can further reduce the brightness of the display, making it appear dim. In typical applications such as medical, industrial, and public telephony, a minimum brightness of 450 cd/m2 is required. In the past, passive display technologies including LCDs had very poor response times compared to active light-emitting display technologies. For consumer industrial displays, such as laptop displays or desktop displays, a response time of less than 30ms is sufficient. However, in industrial, medical, and gaming fields, users can perceive motion in dynamic content environments, which requires LCDs to have faster response times.
In certain industrial applications, special color information is more important than text or numbers. It is crucial to measure the color saturation percentage as a reference. In LCD products, color saturation depends entirely on the backlight. Cold Cathode Fluorescent (CCF) backlighting is a popular technology that can achieve 70% to 80% NTSC color saturation. In some applications, this range may not be wide enough, and sometimes a range close to 100% NTSC color saturation needs to be achieved. This full color saturation is usually achieved with LED backlighting in LCD products.
CCF lamps are the most commonly used backlight source in LCDs. In industrial applications, the lifespan of CCF backlight lamps is generally at least 50,000 hours or the time it takes for the brightness to decrease to half compared to when it was new. In many consumer applications, the required lifespan for backlight lamps is only 10,000 hours, when the brightness drops to half of its initial brightness. Since consumer applications do not require continuous operation, a lifespan of 10,000 hours for CCF backlight lamps is sufficient. However, this is not the case in most industrial and medical applications. The lifespan of backlight lamps is relatively low compared to LCDs. Efforts are being made to increase the lifespan of backlight lamps to twice their current duration, but a minimum lifespan of 50,000 hours is considered the standard for CCF backlight lamps in most industrial applications.
For consumers in the industrial market, it is rare to find displays that guarantee 10 years of operation, whether used in telephone booths or display terminals on oil rigs. Manufacturers can provide displays with lifespans that meet or exceed 10 years. However, most manufacturers of industrial-grade displays produce them for at least 3 years, and in practice, the supply of products can be maintained for at least 5 years.
In contrast, consumer-grade displays used in desktop monitors, laptops, or other consumer devices undergo changes within a year, sometimes as frequently as every 6 months. These industrial displays mainly attract consumers based on price or appearance, like shooting stars: they flash and disappear. However, they still have their place in the market and are widely used in the consumer domain, where continuous operation and compatibility with the size of the device are not significant requirements.
Typically, industrial panel pc manufacturers issue a Product Change Notice (PCN) three months before implementing a change. These changes are then documented, and customers can obtain samples of the new product for testing before receiving the actual shipment. The demand for configuration control is almost nonexistent in consumer displays and is not accepted in the service market. Most consumer-grade industrial displays are essentially short-term sales items, and changes are not typically prescheduled or notified in advance.
