So as i found, qualcomm chipsets have this techonology, named BRITE. As explained in their site: "BRITE solves the issue of backlight intensity and its effect on battery consumption. This technology takes cues from content being displayed on the screen and dynamically adjusts the backlight to make use of natural light, and under the right conditions, can reduce power consumption by up to 50% without compromising image fidelity. What makes BRITE different is that it’s tunable. Different profiles can be chosen based on how much power is needed for the task at hand. For instance, for full screen movie playback, a more aggressive profile can be chosen to control the brightness of the display. For basic tasks like email and web browsing, BRITE can be turned off completely. Qualcomm uses APIs that monitor display quality and brightness levels so that developers can link their applications or type of content to the API and tune the battery savings."
Qualcomm Introduces BRITE and GridView for Snapdragon
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I dont know if this is what causes the screen to dim, but lets say it is, my note's 3 screen dims even when browsing or playling light games and the temperature of the battery is 30-31 celcius so im thinking i have a faulty one... Ill take mine back tomorrow and i am thinking if i can exchange it, to buy the note 3 with the exynos chipset... Now i have the qualcomm one.