With the development of society and the progress of technology, mobile phone has become an important part of life. Human eyes mainly watch mobile phone screen for a long time. The poor quality of mobile phone screen often affects people's comfort level of using mobile phone, which directly determines the quality of user experience. In addition, the glowing parts on the phone also include a rear flash, which directly affects the quality of the image. How to monitor and evaluate the glowing status of the phone screen and flash, and how to do the mobile display luminance measurement
is becoming more and more important.
Color gamut refers to the range of colors expressed by a display device. This parameter is an important parameter of mobile display luminance measurement. To visualize the concept of gamut, the international lighting commission (CIE) has developed a method for describing gamut: the cie-xy chromaticity diagram. In this coordinate system, the range of gamut that various display devices can represent is represented by the triangular region composed of three RGB lines. In this area, the larger the area of the triangle in the device display area, the larger the color gamut of the device.
Gamma is a parameter used to characterize the brightness response of the phone screen. This parameter is also an important parameter of mobile display luminance measurement. Typically, the brightness displayed on the phone's screen is related to the input level by an exponential curve.
It refers to the Angle from which users can clearly observe all the contents on the screen from different directions. Due to the light source of LCD display after refraction and reflection output, the light has a certain direction, forming a certain range of visual Angle, when beyond this range to watch the display will produce brightness decline, color distortion and other phenomena. Therefore, the size of viewable Angle determines the size of the user's visual range and the best viewing Angle. If it's too small, the user can deviate slightly from the front of the screen and the image will fade.