![]() The industry standard display gamma uses a power exponent of 2.2, so each input color component is raised to 2.2, and that is the output luminance of the respective OLED. I won't explain gamma in too much depth, but put simply, gamma correction takes the linear color code values that range from 0% to 100% and raises it to a power. When outputting these color codes, however, there is one more step that takes place, and that is gamma correction. An input color code's individual red/blue/green component values are essentially passed on to the pixel's respective RGB OLED. This is more easily thought of in RGB color codes, where #FFFFFF/rgb(100%,100%,100%) is pure white, #000000/rgb(0,0,0) is black, and shades of gray are any triple with the same red, green, and blue components. A gray pixel is made by forming a white pixel and then lowering the current to its three OLEDs by a percentage based on how light or dark the pixel needs to be. So, how is dark gray made? Gray, dark gray, and light gray are all actually just shades of white. As told earlier, black is the absence of all three color mixtures with no electric current sent to any three of its OLEDs. Every single color that the display produces is a mixture of these three OLEDs at different brightnesses, and white is simply a mixture of all three of these OLEDs. Every pixel has a red, blue, and green subpixel (assuming striped RGB for simplicity), and these are the individual OLEDs that emit their respective color at a certain brightness, and that brightness depends on how much electric current is sent to the LED. In an OLED ( Organic Light- Emitting Diode) display, every single pixel produces its own light that you see. ![]() ![]() However, how much power does pure black actually save over dark gray? To answer this question, we need to first understand some basic OLED anatomy. The answer to that is yes, dark gray still saves battery, but this is the part where most people say "but pure black saves more power because the pixels are actually turned off!" I'm going to sort of contradict my own title here, but yes, both statements in that outcry are true.
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