Microsoft Technology Licensing, LLC

Tero Maaranen

Samu Kallio

Toni Hemminki

Juha Pänkälä

In one example, an apparatus comprises a display panel having a first active mode with a first refresh rate and at least one of a first bit depth or a first brightness, and further having a second active mode with a second refresh rate and at least one of a second bit depth or a second brightness, the second refresh rate being lower than the first refresh rate, the second bit depth being lower than the first bit depth, and the second brightness being lower than the first brightness. The apparatus further comprises a controller. In response to receiving an image update request while the display panel is in the second active mode, the controller is configured to otherwise keep the display panel in the second active mode but switch the display panel to an intermediate refresh rate higher than the second refresh rate until completion of the image update request.

Temporarily increased refresh rate for a display panel in low power mode

A temperature of a display is evaluated from the image displayed. The device may be tested with various images or with various test patterns in order to obtain the heat generation response related to the image. For example, a bright image may generate more heat than a dark image. The heat generation response behavior is stored into a device memory. A heat radiation response behavior is also obtained with various test patterns. The display temperature is estimated using an image to be displayed with the predetermined heat generation and heat radiation responses. The ambient temperature may be used to improve the estimation.

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Tero Maaranen