Under-display sensor brightness control for artifact reduction
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Solution Overview
Problem
The transition between different brightness control schemes for under-display fingerprint sensors can result in visible artifacts, such as flicker, due to the need to increase the brightness of pixels overlying the sensor without affecting the apparent brightness of other pixels.
Innovation Solution
A computing device temporarily adjusts the brightness level of pixels not overlying the fingerprint sensor when transitioning to a local high brightness mode, thereby canceling out the temporary visible increase in brightness and reducing the appearance of artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the brightness of pixels overlying the fingerprint sensor is increased to enable sensor operation, then the fingerprint sensing capability is improved, but visible artifacts such as flicker appear in the display
Solution Approach 1:
The patent applies local quality by differentiating the brightness control between two regions: pixels overlying the fingerprint sensor receive high brightness signals to enable sensing, while other pixels receive adjusted brightness signals to prevent visible artifacts. This spatial differentiation allows the system to achieve both fingerprint sensing capability and visual consistency simultaneously.
Solution Approach 2:
The patent implements preliminary anti-action by proactively adjusting the brightness of non-sensor pixels before the transition to local high brightness mode completes. This preemptive adjustment counteracts the potential visible artifacts that would otherwise occur during the transition, eliminating flicker before it becomes apparent to the user.
2Adaptability or versatility
If the brightness control scheme transitions from global to local high brightness mode, then the fingerprint sensor operation is enabled, but the transition causes visible artifacts
Solution Approach 1:
The patent applies dynamics by implementing a dynamic brightness control system that can transition between global and local high brightness modes. The system dynamically adjusts the brightness signals based on the operational state, smoothly transitioning from uniform brightness control to localized high brightness control without causing visible artifacts through coordinated adjustment of both sensor and non-sensor pixel regions.
3Measurement precision
If pixels overlying the fingerprint sensor operate at high brightness level, then the sensor detection precision is improved, but the apparent brightness of other pixels is affected
Solution Approach 1:
The patent applies local quality by directing high brightness light emission specifically to pixels overlying the fingerprint sensor to improve detection precision, while simultaneously controlling the brightness of other pixels to maintain consistent apparent brightness across the display. This localized approach ensures that the high brightness requirement for sensing does not compromise the visual appearance of the display.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively eliminates or reduces the visual appearance of artifacts like flicker when activating the local high brightness mode, ensuring a consistent user experience by maintaining the same perceived luminance across the display.
Implementation Method 1
An under-display fingerprint sensor may utilize light emitted by pixels of the display that overlie the under-display fingerprint sensor to sense fingerprints
Data Source
AI summary
An example device includes a display panel; a fingerprint sensor configured to sense a fingerprint through the display panel; and processing circuitry configured to: responsive to activation of the fingerprint sensor: activate a local high brightness mode by at least increasing an amount of light radiated from a first portion of the display panel that overlies the fingerprint sensor; and temporarily decrease controlled brightness of a second portion of the display panel that is non-overlapping with the first portion.