Microsoft Patent Reveals Brand New Dimming Tech For Displays, Allowing Gamers To Control Pixels Individually

Microsoft has published a new patent that showcases a pixel-dimming technology for displays that can be helpful for gamers.

Microsoft's "Pixel Luminance For Digital Displays" Lays Out Display Pixel Dimming Technology For Gamers

The patent explains the control of luminance of digital displays that feature rows of pixels by reducing their input voltage. Dimmer pixels are said to work great to conserve power and more importantly, in environments where ambient light levels are higher, the luminance can also be increased. The former advantage can benefit devices that are running on a battery such as laptops and smartphones.

In particular, such situations can arise when the digital display uses a variable refresh rate. Depending on the type of content presented on the digital display, it can in some cases be desirable to vary the display's refresh rate. For example, a variable refresh rate may be used when the digital display is presenting visual content of a video game application that outputs image frames at different rates depending on the current complexity of the scene. As another example, some display devices may be configured to dynamically change their refresh rate to conserve power—e.g., the refresh rate may be reduced as the device's battery is depleted, or when the device enters a “power saver” mode. In any case, when pixels of the display device are driven with a pulse-width modulated signal and a variable refresh rate is used, the digital display may transition between different refresh rates that cause apparent increases or decreases in the brightness of the displayed image.

Accordingly, the present disclosure is directed to techniques for driving pixels of a digital display using pulse-width modulated signals in a manner that mitigates or alleviates the flickering issue described above. In one example, mitigation is accomplished via spatial averaging, in which half of the pixel rows of the digital display (e.g., odd rows) are supplied with pulse-width modulated signals having an opposite phase from the other half of the pixel rows (e.g., even rows). Thus, during image frames where the frequency of the pulse-width modulated signal is a non-integer multiple of the refresh rate, half of the pixel rows will have relatively higher luminous intensity, while the other half will have relatively less luminous intensity. Through spatial averaging, the display may appear to have a relatively uniform luminance to human viewers.

via JUSTIA Patents

Some of the features of this display pixel-dimming technology include (via Windows Report):

• Brightness: The pulse-width modulated signal can control the brightness of the pixels. By changing the length of the “on” and “off” pulses, the display can make some of its parts brighter or dimmer, at the same time.
• Color Accuracy: The timing of the signals can also affect the color of the pixels. If the signals are sent at the right times, the display can show the colors more accurately.
• Refresh Rate: The rate at which the signals are sent can affect how quickly the display can change what it’s showing. This is important for things like watching videos or playing games, where the screen needs to change rapidly.
• Power Consumption: The use of pulse-width modulation can also affect the power consumption of the display. Displays that use this technique can often save power, which can make the device’s battery last longer.

The other benefit of this new patent is allowing users to set one part of the screen brighter and one part of the screen dimmer and vice versa since each pixel is individually controlled. The driving force behind this new technology would be a component known as EM gate driver which controls the brightness of each pixel through signals.

Microsoft's Windows 11 includes a lot of display tuning options and this new Luminance technology can be a further step in refining the viewing experience of gamers and users.

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