? Everyone is familiar with the screen of the mobile phone. You can find that not only the screen of the mobile phone, but also other screens are black. If the screen is black for power saving, do you think that the black phone wallpaper is more energy efficient than white? Below, Xiaobian will answer these questions for you. Why are all kinds of screens black? The principle of the display is to display different colors by superimposing the three primary colors of red, green and blue. White is displayed when fully illuminated. Since there is no substance that emits black light after being energized, that is, a substance that absorbs light, a white display may only display white. And if you don't change the color of the screen through hardware, then you want to make the screen display white only to keep the screen powered on, so the power consumption of the screen is very amazing. How to consider it, the white screen is unrealistic. Is black mobile wallpaper more energy efficient than white? Black phone wallpaper is more energy efficient than white. This is not necessarily the case, because the panels of different mobile phone screens are different, divided into LCD screens and OLED screens. For LCD screens (such as our common TFT, IPS screen), black wallpaper and white wallpaper consume almost no difference in power consumption, because the LCD screen can not self-illuminate, in addition to the LCD screen drive circuit and touch circuit will also produce very A small part of the power consumption, its power consumption is almost entirely from the backlight module, if expressed by the formula, the luminous efficiency of the LCD screen showing all white is proportional to the product of the conversion efficiency of the backlight and the pixel aperture ratio. In simple terms, the ordinary LCD screen itself does not emit light. The white light is emitted by the lamp behind it, penetrates the screen and shines into our eyes, so we can see the image. When the black screen is displayed, although the LCD screen is completely black, the light on the back is still shining, so we will see a white spot on the edge. As a result, everyone understands better. Since the backlights are all on, naturally there is no problem with the color of the wallpaper. For OLED screens (such as AMOLED series screens), using black wallpapers will actually save more power than using white wallpapers, because the luminescence of each pixel of the OLED screen is independent, in terms of the screen power consumption and the actual screen. The intensity of the emitted light is directly proportional, or the power consumption of the OLED screen is proportional to the sum of the brightness of each pixel, that is, how much electricity is used for display. When most pixels are turned off or dark colors are displayed, the OLED is more efficient than the LCD. many. When all black is displayed, all the pixels of the OLED screen are not illuminated, and the effect is similar to the off-screen state, so the black display effect of the OLED screen is better than that of the LCD screen, and the power consumption is also lower. If only one pixel on the entire screen needs to be illuminated, then for the lcd screen, the backlight still has to work full. On the OLED screen, as long as that pixel is illuminated, other pixels can be completely turned off, so black wallpaper will save more power than white wallpaper. This article comes from [System Home] www.xp85.com