i was refering to this which they posted on their forums.
Yellowish Hue
The yellowish hue that the screen gives off stems from three factors.
First, most display suppliers, in our case JDI (Apple’s iPhone displays supplier), have different factories. Depending on the factory and the batch, the temperature of the screen will vary slightly. We are very strict with our Quality Controls and our screen temperatures are very similar within different batches.
However, this temperature discrepancy exists for most expensive devices in the market, such as the iPhone 5s, the Nexus 5, and the HTC One, despite their strict quality control measures (some examples below).
Second, we deliberately chose a warm IPS screen from JDI because warmer screens display skin tones more accurately in addition to being better for gaming, watching movies, and reading.
Third, the latest update of CM 11S is calibrated to enhance this “warmness” in order to display more realistic colors and avoid fatigue when reading text with white backgrounds.
With the latest software update you can adjust your screen’s hue manually, via Settings > (under Device) Display & Lights > (under Advanced Settings) Screen Color > Custom > Hue.