Smartphone displays now are tested in RGB color mode. R is RED, G is GREEN, and B is BLUE. In the RGB model image , each RGB pixel component is assigned an intensity value which is in the range of 0-255.

By using only three colors , RGB imagemakes them composedin different proportions, showing 16777216 colors on the screen.

Different LCD determines the mixing ratio of display color .Many LCDs on the market are either blue or red, or white , this is determined by the combination of backlight , LCD and polarizer . Same materials produced in different batches may also have inconsistent hue issues  

Different LCD determines the mixing ratio of display color .Many LCDs on the market are either blue or red, or white , this is determined by the combination of backlight , LCD and polarizer . Same materials produced in different batches may also have inconsistent hue issues

1. K Numerical Value Standard

The display shows differently when K value varies :  

1. Absolutely white at 6500 2. Cool color > 6500 3. Warm color <6500

As shown in the graph below, When K value is between 6500-7000,the displayshowscool white, and the color is evenly distributed. If the backlight brightness is sufficient, the LCD color will be very close to the originalLG one

If between 6000-6500,it shows warm white , color is evenly distributed. If the backlight brightness is sufficient, the LCD color will be very close to the originalSharpone

The LCD color looks nice when K value is between 6000-8000 , it will be starting to get blue when higher than 8000 , it will get extremely blue , even glaring when higher than 9300

Therefore,the perfect range is 6000- 8000.

2. K Numerical ValueComparison

At present, many suppliers and factories just use the naked eyes to detect the quality of color&brightness. Cino testseach screen based onthe Kvalue &CD value . We regard it as qualified when it is within the range specified by our company , otherwise ,it belongs toinferior-quality product

3.K Numerical Value Form

Our screenis divided into Class S and Class A .
Class S is Tianma LCD, ESR highlight backlight,original polarizer, A++ level .
Class A is Longteng LCD, ordinary backlight, supercopy polarizer, A++ level .

Summary:The reason why your suppliers are unstable on quality is that because their test standard is not digitized, but visually observed. The standard of each tester is different, which will result in different color& brightness . CINO uses data-based standard to detect products to guarantee the quality of your orders