Why "yellow" on the screen of PC or smartphone differs depending on the product

Comparing the screens of smartphones such as iPhone / Xperia / Nexus, the color development of the display is slightly different. In particular, there may be a big difference in "yellow", but why differences will arise depending on the product, on this point Miami UniversityAugmented Reality Research GroupIt explains.

Computer colors are not consistent | The Augmented Reality Center
http://augmentedreality.miamioh.edu/computer-colors-arent-consistent/

For human visual cellsRodWhenConeExist. The pyramidal cell is sensitive to color and contains a photoreceptor that absorbs three lights of red, green and blue, and there is no receptor that absorbs yellow light, but red and By mixing the green light, it is possible to recognize it as yellow as a result.

Even when color is created on the smartphone display, red and green are emitted to express yellow, but at this time, red and green are expressed using slightly different wavelengths. This is the difference in coloring.

For example, the numerical value of "HTC One M7" wavelength is as follows. The horizontal axis represents the wavelength of light, the vertical axis represents the intensity of the wavelength, and the red, green, blue and black lines represent red, green, blue and white, respectively. It is making a display that felt blue strongly in the vicinity of wavelength 450 nm, green color in the vicinity of wavelength 530 nm to 550 nm, and red color in the vicinity of wavelength 610 nm.


The graph of "HTC One M8" seems to have suppressed the intensity of the blue color of 510 nm wavelength compared to "HTC One M 7".


Compared to the "HTC One" series, "iPad mini" has strength in green / red color around the wavelength of 445 nm, blue intensity in the vicinity of the wavelength of 520 nm is more than "HTC One M 7".


Even the same Apple product "iPhone 4s" and "iPad mini" drawn another graph.


"Nexus 7"Has become a graph similar to" HTC One M7 ".


Looking at the graph, a subtle difference in light emission by the product leads to a difference in the coloring of the display.