Google Inc.

Hsin-Yu Chen

Chien-Hui Wen

Yichi Chen

John W Kaehler

Ken Foo

An example method includes measuring, from a device having a display panel, a plurality of luminance values for a plurality of pixels located along a cross-section of the display panel. The method includes selecting, based on the measured luminance values, a target luminance value. The method includes determining a luminance compensation profile for the input gray level at the given refresh rate. The luminance compensation profile comprises ratios of the measured plurality of luminance values to the target luminance value. The method includes storing, at the device, the luminance compensation profile. Subsequent to the storing, the device is configured to adjust input display data using the luminance compensation profile for an input gray level when the display panel is providing a display. The luminance compensation profile maintains a color uniformity of the display.

Modified demura algorithm for display panels

A method involves measuring, for an optical property of the display panel for an input gray level and at a first refresh rate, first and second values at respective first and second ambient brightness levels. The method also involves determining a compensation factor for the input gray level at the first refresh rate. The method further involves determining a modified gamma value at a second refresh rate, wherein the modified gamma value reduces a perceived optical defect of the display panel when operating at the second refresh rate by maintaining a consistent delta difference in values for the optical property between the first and second refresh rates at different ambient brightness levels. The method additionally involves storing the modified gamma value, where the device is configured to adjust input display data using the modified gamma value when transitioning from the first refresh rate to the second refresh rate.

Recalibrating gamma curves for seamless transitions in multiple display refresh rates

An example method includes determining, for a device having a display component configured to operate at multiple brightness levels and for a range of DBVs, a gamma value offset to a default gamma value at the second brightness level. The method includes determining, for a tap point representative of the range, a brightness value offset to a default brightness value at the second brightness level. The method includes storing the gamma value offset and the brightness value offset. Subsequent to the storing, the device is configured to transition, in response to a fingerprint authentication triggering event, the display component from a first brightness level to a second brightness level by: overriding a default gamma value based on the gamma value offset, and displaying a portion of the display component by applying a value offset to a default brightness value at the second brightness level based on the brightness value offset.

Smart algorithm for seamless transition with under display fingerprint sensors

An example device includes a display component that is configured to operate at a first refresh rate or a second refresh rate. The device also includes one or more processors operable to perform operations. The operations include identifying a rate change triggering event while the display component is operating at the first refresh rate. The operations further include determining a current brightness value of the display component. The operations also include determining, based on an environmental state measurement associated with an environment around the device, a threshold brightness value. The operations additionally include transitioning the display component from the first refresh rate to the second refresh rate m response to identifying the rate change triggering event if the current brightness value of the display component meets or exceeds the threshold brightness value.

Seamless transition for multiple display refresh rates

A method for calibrating input display data for multiple display refresh rates comprises measuring () an optical property of a display panel for an input gray level at a first refresh rate, measuring () the optical property for a plurality of candidate gray levels at a second refresh rate, selecting (), based on the measured optical properties of the display panel, a corresponding gray level for the input gray level, wherein the corresponding gray level is selected from the plurality of candidate gray levels and storing (), at the device, the corresponding gray level for the input gray level, wherein subsequent to the storing, the device is configured to adjust input display data using the corresponding gray level for the input gray level when the display panel is transitioning from the first refresh rate to the second refresh rate.

Calibrating input display data for seamless transitions in multiple display refresh rates

A method may include measuring, from a device having a display panel configured to operate at a first refresh rate or a second refresh rate, a difference in luminance of the display panel between the first refresh rate and the second refresh rate for an input gray level. The method may also include applying, based on the measured difference in luminance, a value offset to a default gamma value used by the device for the input gray level when the display panel is operating at the second refresh rate, thereby generating a new gamma value. The method may further include storing, at the device, the new gamma value, where subsequent to the storing, the device is configured to override the default gamma value for the input gray level with the new gamma value when the display panel is operating at the second refresh rate.

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Taoyuan, Taiwan

Hsin-Yu Chen