Hey there! As an HMI supplier, I've been in the thick of the industry for quite a while, and I've seen firsthand how crucial color choices are for an HMI screen. In this blog, I'll share some insights on what color choices work best for HMI screens and why.
Why Color Matters in HMI Screens
First off, let's talk about why color is such a big deal in HMI (Human - Machine Interface) screens. An HMI screen is the bridge between humans and machines. It's where operators interact, monitor, and control various industrial processes. The right color scheme can make this interaction smooth and efficient, while the wrong one can lead to confusion, errors, and even safety hazards.
Colors can convey different types of information quickly. For example, red is commonly associated with danger or an emergency stop. When an operator sees a red indicator on the HMI screen, they immediately know that something is wrong and needs their urgent attention. On the other hand, green is often used to indicate normal operation or that a process is running smoothly.
Basic Color Principles for HMI Screens
Contrast
One of the most important principles is contrast. High contrast between text and background colors is essential for readability. If the text and background are too similar in color, it can be extremely difficult for operators to read the information on the screen, especially in environments with varying lighting conditions.
For instance, black text on a white background provides excellent contrast and is very easy to read. However, in some industrial settings, a white background might be too bright and cause glare. In such cases, a darker background with a lighter text color can be a better choice. For example, yellow or white text on a dark blue or black background also offers good contrast.
Color Associations
As I mentioned earlier, colors have certain associations. In addition to red for danger and green for normal operation, yellow is often used to indicate a warning or an intermediate state. For example, if a machine is about to reach a critical limit, a yellow indicator can alert the operator to take preventive action.
Blue can be used for informational purposes, such as displaying system status or general data. It's a calm and easy - on - the - eyes color that doesn't cause as much stress as red or yellow.
Consistency
Consistency in color usage is key. Throughout the HMI screen, the same color should always represent the same type of information. If red is used for emergency stops on one part of the screen, it should be used for the same purpose everywhere else on the screen. This helps operators develop a mental model of the system and makes it easier for them to interpret the information quickly.
Color Choices for Different Types of HMI Screens
Industrial HMI
Industrial HMIs are used in a wide range of industrial environments, from factories to power plants. These environments often have harsh lighting conditions, so the colors need to be highly visible and distinguishable.
For the background, a neutral color like gray or black is a popular choice. Gray is a good middle - ground as it's not as harsh as black and can still provide good contrast for text and other elements.
For critical information, like alarms or safety hazards, bright and vivid colors such as red or orange are necessary. These colors can cut through the background noise and grab the operator's attention immediately.
HMI 10 Inch
The 10 - inch HMI screens are relatively large, which gives more space for detailed information. They can be used in a variety of applications, including automation systems in small - to - medium - sized industries.
With a larger screen, it's important to use color to organize the information. You can use different background colors for different sections of the screen. For example, a light blue background for the data display section and a neutral gray for the control buttons area.
Also, when using icons and graphics, make sure they have clear colors. For example, if you have an icon representing a valve, use a distinct color for the open and closed states, such as green for open and red for closed.
HMI 7 Inch
The 7 - inch HMI screens are more compact. Space is at a premium here, so the color choices need to be even more strategic.
Since there's less space for text, use colors to convey information as much as possible. For example, instead of writing "Low Pressure" in text, you can use a blue indicator to show normal pressure and a yellow one to indicate low pressure.
The background color should be simple and not too distracting. A solid color like black or dark gray works well as it can make the foreground elements stand out.
Challenges in Color Choices for HMI Screens
Cultural Differences
One of the challenges in choosing colors for HMI screens is cultural differences. Colors can have different meanings in different cultures. For example, in Western cultures, white is often associated with purity and innocence, but in some Asian cultures, it's associated with death and mourning.
As an HMI supplier, we need to be aware of these cultural differences, especially if our products are going to be used in international markets. We may need to customize the color schemes based on the target market.
Color Blindness
Another challenge is color blindness. A significant portion of the population has some form of color blindness, which can affect their ability to distinguish between certain colors. For example, people with red - green color blindness may have trouble telling the difference between red and green indicators.
To address this issue, we can use additional visual cues, such as different shapes or patterns, in addition to colors. For example, a red square can be used for an emergency stop, and a green circle for normal operation.
Conclusion
Choosing the right colors for an HMI screen is a complex but crucial task. It involves considering factors such as contrast, color associations, consistency, the type of HMI screen, and potential challenges like cultural differences and color blindness.
As an HMI supplier, we're committed to providing high - quality HMI screens with the best color choices. If you're in the market for an HMI screen, whether it's an Industrial HMI, HMI 10 Inch, or HMI 7 Inch, we'd love to have a chat with you about your specific requirements. Feel free to reach out to us for a detailed discussion on color options and how they can best serve your operations. Let's work together to create an HMI solution that's not only functional but also user - friendly.
References
- Wickens, C. D., Gordon, S. E., & Liu, Y. (1998). An introduction to human factors engineering. Addison - Wesley.
- Norman, D. A. (2013). Design of everyday things. Basic books.