Knowledge about Industrial Displays' Viewing Angles

The viewing angle of industrial displays has three definitions. Only those who have had deep exposure to industrial displays will understand the knowledge about viewing angles. Today, we will explain some knowledge about viewing angles. Industrial displays have inherent physical characteristics that cause changes in image quality when viewed from different angles. Compared to looking straight on, when viewed from an angle, when the image quality has changed to an unacceptable critical angle, it is called the viewing angle of the display, and there are three definitions for the viewing angle.

Advantages of industrial displays

The advantage of industrial displays is that operators can perform operations on the host by touching symbols or characters on the touch screen, eliminating the need for keyboard and mouse operations, making human-computer interaction more direct. It is mainly used in public places such as hall information inquiries, leadership offices, song selection, menu ordering, multimedia teaching, etc. Touch industrial displays are mainly divided into three types: resistive touch screens, capacitive touch screens, and surface acoustic wave touch screens. The most common is resistive touch screens.

Industrial computers display technology is a new type of human-computer interaction input method. Compared with traditional keyboard and mouse input methods, touch screen input is more intuitive and convenient. With recognition software, touch screens can also realize handwriting input. The touch screen consists of a detection component installed in front of the display screen and a touch screen controller. When a finger or other object touches the touch screen installed in front of the display, the touched position is detected by the touch screen controller and sent to the host through the interface.

Viewing angles of industrial displays

Contrast

If an industrial display is viewed from an oblique direction, compared to viewing it straight on, the white background will become darker and the black will become brighter, resulting in a decrease in contrast. Generally, the angle at which the contrast drops to 10 is defined as the viewing angle of the industrial display. In other words, it is defined as the angle greater than this viewing angle where it is difficult to distinguish black and white. This definition is most commonly used by panel manufacturers and monitor manufacturers in their specifications.

Gray inversion

In theory, an industrial display monitor should become brighter as the gray level increases from zero (black) to 255 (white). However, in some large angles, it is possible to see that lower gray levels appear brighter than higher gray levels, similar to black and white inversion. This phenomenon is called gray inversion. The maximum angle where gray inversion does not occur is defined as the viewing angle. Beyond this angle, it is possible to see gray inversion, which is an unacceptable image quality.

Color deviation

When viewing an industrial display from different angles, it will be noticed that the colors change with the angle. For example, the originally white screen may appear more yellow or blue, or the colors may become lighter. As the angle increases, when the color change has reached an unacceptable critical point, this angle is defined as the viewing angle.