The RGB displays in most screens use an intensity of 0 to 255 for each subpixel, so creating the wide spectrum of a 'color space' is complex.ĭash and Hu made a mathematical model for the RGB color space, then tested how an OLED display drew power by sampling pixels from each individual frame of on-screen activity while using the mobile apps.īesides providing insight on power behavior, the researchers used their data to create two pieces of software to help people understand how on-screen content influences battery usage. To calculate the energy used to generate a single pixel, for instance, you can't just add-up the energies from the three LED subpixels - red, green, blue (RGB). Previous estimates of power behavior were based on overly-simple assumptions. That's not at all straightforward because the way a phone's components draw power isn't a linear relationship: when you adjust screen brightness from 100% to 50%, for example, the power drawn by your OLED display isn't simply reduced by half. The researchers started by reexamining how power behavior is estimated.
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