White balance design according to customer demand, summed up a set of their own calculation. As long as customers will you need brightness and display space to tell us, we will be all-round for customer service, for customers to display screen for a perfect light distribution scheme. For the convenience of the following introduction,I first introduce some terminology and definitions. White balance : three color deployment to a vision of white process. Deployment can be divided into two content:
The color and brightness.
1: set a fixed conditions: temperature, voltage, selection of power line.
2: set color target and scope ( tolerance ), generally refers to the target color X, Y value.
3: white brightness adjustment. Mixed color total brightness on composition of mixed color of various colors and luminance summation called brightness additivity law. Color appearance of the same light, regardless of their spectral composition is the same, the colors are mixed in with the same effect, that is to say, all in visually identical colors are equivalent, the law can be derived color instead of law. Color matching equation in (C ) are represented by matching the color of the unit, ( R ) ( G ) ( B ) represents the resulting mixed colors red, green, blue unit, R, G, B, C respectively represent the red, green, blue and by matching the color of the quantity, when reaching the match:
C ( C ) = R ( R ) = G ( G ) = B ( B )
The representation of the visual equivalent, R, G, B as the representative of quantity, can be negative.
We first introduce a laws of gravity to everyone, B in the drawing for color 1, color G for 2, R for color 3, C G+R W B+C mixed color, mixed color, this is actually a white balance diagram, we can use C as a green and red colours, as can be seen from the graph, it is roughly in the Yellow region, C and blue mix, it can through our white interval, can be mixed by white light. Where B = X1+Y1+Z1C = X2+Y2+Z2
X1, Y1, Z1; X2, Y2, Z2 for Blu-ray and C three mixed color stimulus values. The laws of gravity was: CM / BM = B / C = ( X1+Y1+Z1 ) / ( X2+Y2+Z2 )
CM's distance and C inversely, namely the blend color C greater the proportion of CM, the shorter the distance, the white light and making everyone's experience, fluorescent powder amount, color more yellow (CM very short.). Here to introduce our method to calculate : 1 first to surface light source to a point light source, the W brightness value, we know that the surface light source unit is Nit, CD / m2, and we the brightness of LED is MCD, we will turn to mcd. Display screen brightness is divided by the total of every square metre points can be.