0 Preface
The mobile phone display screen is indispensable from the birth of the mobile phone, just from the previous display of numbers, texts to the present, books, music, video, games, etc., especially with the popularity of large-scale mobile games, users The requirements for mobile phone screens are also getting higher and higher. Therefore, the screen material of the mobile phone has evolved from the original UFB, STN to the current TFT, SLCD and so on.
However, after all, the screen material is really enough, and consumers can't understand their advantages and disadvantages. This article first analyzes the current nine mobile phone screen materials, so that consumers have a clear view of consumption. In addition to the traditional TFT, OLED and other screens, there are NOVA, AMOLED, Suoer AMOLED, Super AMOLED Plus, IPS, SLCD, ASV and other popular screen materials and technologies. The table below summarizes the representative models and advantages and disadvantages of these nine categories of mobile phone screens. As can be seen from Table 1, different screen materials have their advantages and disadvantages, the key lies in the choice of consumers.
As can be seen from Table 1, the advantages of IPS and LCD screens are high color reproduction, but which screen has higher color reproduction? In order to solve this problem, this study takes the current mainstream mobile phone Huawei mate7, Huawei p8, iphone 5S, iphone 6 plus as an example, analyzes Huawei mate7 to magnify 5 times under the microscope, and observes the screen to obtain red, green and blue colors before and after stripping. The hyperspectral corresponding change; the iphone 6 plus is magnified 10 times under the microscope to observe the hyperspectral characteristic changes of the red, green and blue colors before and after the opening of the eyepiece; meanwhile, the three mobile phones of Huawei p8, iphone 5S and iphone 6 plus are analyzed. Under the condition of microscopic magnification of 5 times and 10 times, the hyperspectral characteristics of the three colors of red, green and blue changed.
1 test part
1.1 Instruments and parameters
This experiment utilizes the GaiaMicro microspectral imaging system independently developed by Sichuan Shuangli Hepu Data Technology Co., Ltd., with a spectral range of 400-1000 nm, a spectral resolution of 2.8 nm, and an image resolution of 1392*1040. The microspectral imaging system is shown in Figure 1.
Figure 1 400-1000nm series microscopic hyperspectral imaging system
1.2 Sample source
The four mobile phones, Huawei mate7, Huawei p8, iphone 5S and iphone 6 plus, were purchased by the company's colleagues in the mobile phone manufacturer for their own use.
1.3 Test methods
Under the same external conditions, the GaiaMicro microspectral imaging system was used to obtain the hyperspectral image data of the red, green and blue colors of the Huawei mate7 before and after the microscopic magnification of 5 times; the iphone 6 plus was magnified 10 times under the microscope. Hyperspectral image data of red, green and blue colors before and after opening the eyepiece; hyperspectral image data of three colors of red, green and blue under the conditions of microscopic magnification of 5 times and 10 times by Huawei p8, iphone 5S and iphone 6 plus. Use ENVI's ROI Tools tool to calculate the spectral changes of the red, green, and blue colors at 400-100 nm under the same number of elements.
2 Results and discussion
2.1 Huawei mate7 microscopically magnified 5 times its spectral changes of red, green and blue before and after stripping
Huawei Mate7 is equipped with a 6-inch display with FHD 1080p (1920x1080) pixel resolution, 368PPI, IPS/LTPS (low temperature polysilicon) technology, and the surface covers Corning Gorilla's 3rd generation glass. As can be seen from Figure 2, when Huawei Mate7 is stripped, its blue display peak will rise, but the position will remain unchanged; the green display peak will rise as blue, but the peak position will be red-shifted. "; while the red shows a peak drop, and the position of the peak has a "blue shift"
. Can judge Huawei mate7
The display color reproduction is normal.
Figure 2 Huawei Mate7 mobile phone screen color difference before and after film removal (microscopic magnification 5 times)
2.2 iphone 6 plus microscopically magnified 10 times its spectral changes in red, green and blue before and after opening the eyepiece
The iPhone6 ​​Plus features a 5.5-inch LCD screen with built-in 1920 x 1080 resolution and a PPI of up to 400. As can be seen from Fig. 3, when the ihpone6 plus eyepiece is opened, the peaks of the blue and green display will rise compared with those before the eyepiece is opened; the peak of the red display will decrease; but the peak positions of the red, green and blue colors remain unchanged. 2 and 3, compared with Huawei mate7,
The iPhone6 ​​Plus's display has a higher color reproduction.
Figure 3 Differences in color display before and after ihpone6 plus open eyepiece (microscopic magnification 10 times)
2.3 Huawei p8, iphone 5S, iphone 6 plus under the conditions of microscopic magnification 5 times, 10 times, its spectral changes in red, green and blue
Huawei P8 uses a 5.2-inch IPS-Neo negative-facing LCD screen with a built-in 1920×1080 resolution PPI of up to 423. It can be seen from Fig. 4 that the peaks and peak positions of the three colors of red, green and blue are greatly changed when the microscope is magnified by different magnifications. When the magnification is 5 times, the peaks of red, green and blue are larger than the peak of 10 times of magnification; When the microscopic magnification is 10 times, the blue peak position remains unchanged compared with the microscopic magnification of 5 times, the green peak occurs "blue shift", and the red peak occurs "red shift". According to the comprehensive judgment, the color reproduction degree of the display of Huawei P8 is poor.
Figure 4 Huawei p8 microscopic magnification different magnifications showing their differences in color
The iPhone 5S is equipped with a 4-inch screen, a 1136x640 resolution Super HD IPS capacitive touch screen with a PPI of 326. As can be seen from Fig. 5, the microscope magnifies different multiples, and the peak and peak positions of the iphone5S red, green and blue colors also undergo a large change. When the microscopic magnification is 5 times, the peak value of the blue is less than 10 times the peak value, but the peak position is unchanged; when the microscopic magnification is 5 times and 10 times, the peak of the green does not change significantly, but the peak of the microscopic magnification is 10 times. The peak has a "red shift"; when the microscopic magnification is 5 times, the red peak is 10 times higher than the microscopic magnification, and the green peak has a "red shift", but when the microscopic magnification is 10 times, the peak position occurs. "Blue shift." Comprehensive judgment shows that, like Huawei P8, the color reproduction degree of iphone 5S display is more general.
Figure 5 iphone 5S microscopic magnification different times its color display difference
The iPhone6 ​​Plus features a 5.5-inch LCD screen with built-in 1920 x 1080 resolution and a PPI of up to 400. As can be seen from Figure 6, regardless of
The display of the iPhone6 ​​Plus is magnified 5 times or 10 times under microscopic conditions, and the peak positions of the red, green and blue colors remain unchanged, and the peak size does not change significantly. Therefore, with Huawei P
8, iphone 5s compared to the iphone 6 plus color reproduction is higher.
Figure 6 iphone 6 Plus microscopic magnification of different multiples showing their differences in color
3 Conclusion
It can be seen from Fig. 3 and Fig. 6 that the iphone 6 plus has no significant change in the spectral values ​​of the three colors of red, green and blue under the different conditions of microscopic magnification before and after opening the eyepiece, which fully demonstrates
Iphone 6 plus
LCD screen color reproduction is higher; as can be seen from Figure 2, Figure 4, Figure 5, whether it is Huawei mate7, Huawei P8 or iphone 5S, the color reproduction degree of the display is relatively general, carefully analyzed, these three The phones are equipped with IPS screens. According to the comprehensive analysis, the color reproduction degree of the LCD screen is higher than the color reproduction degree of the IPS screen.
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