Under-display Proximity Sensor Calibration for Burn-in Misrecognition
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Solution Overview
Problem
Burn-in in electronic device displays leads to misrecognition by proximity sensors due to changes in light wavelength reproducibility, causing false detection of objects even when none are present.
Innovation Solution
An electronic device with a proximity sensor positioned under the display, equipped with a light emitting and receiving element, uses a processor to calibrate a reference range based on the characteristics of entering light, preventing misrecognition by adjusting the reference range in response to burn-in effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the display is used for a long time, then the display provides continuous visual output, but burn-in occurs causing color reproducibility degradation and wavelength shifts
Solution Approach 1:
The system performs preliminary calibration of the proximity sensor by detecting light from the display at different brightness levels and storing reference values before normal operation. This preliminary action establishes a baseline that accounts for the display's light characteristics, enabling the sensor to distinguish between display light and reflected object light even as burn-in progresses.
Solution Approach 2:
The system changes the operating parameters of the display by adjusting brightness levels to multiple predetermined levels during calibration. By detecting light at these different brightness levels, the system captures the display's light emission characteristics across its operating range, creating a reference profile that adapts to the display's actual performance and compensates for burn-in effects.
2Measurement precision
If the proximity sensor detects light at a set wavelength, then it can identify nearby objects, but burn-in causes the display to emit light at that wavelength leading to false detection
Solution Approach 1:
The system uses feedback by continuously monitoring the light detected by the proximity sensor and comparing it against stored reference values from calibration. When the detected light characteristics match the display's emitted light profile rather than reflected object light, the system correctly identifies this as a false detection condition and adjusts accordingly, preventing erroneous object detection.
Solution Approach 2:
The system performs preliminary calibration to establish reference light detection values before normal proximity sensing operation. This preliminary action creates a baseline understanding of what light the display emits at various brightness levels, enabling the sensor to differentiate between display-emitted light (which causes false detection) and light reflected from actual nearby objects.
3Ease of operation
If the proximity sensor is disposed under the display, then it remains visually unrecognized, but it detects display light as if it were reflected object light
Solution Approach 1:
The system performs preliminary calibration by having the display emit light at multiple predetermined brightness levels and recording the corresponding light detection values from the proximity sensor. This creates a reference profile of the display's light emission characteristics, enabling the sensor to later distinguish between light originating from the display versus light reflected from external objects.
Solution Approach 2:
The system uses feedback mechanisms to compare light detection values against the stored reference profile. When the proximity sensor detects light matching the display's emission pattern rather than reflected object light characteristics, the system identifies this as a false detection condition and adjusts its interpretation accordingly, maintaining measurement precision despite the sensor's position under 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
Effectively reduces false object detection by continuously calibrating the reference range, ensuring accurate identification of nearby objects despite burn-in-induced changes in light emission from the display.
Implementation Method 1
a proximity sensor having a light emitting element and a light receiving element which are positioned under the display
Implementation Method 2
a proximity sensor having a light emitting element and a light receiving element which are positioned under the display
Data Source
AI summary
An electronic device for preventing misrecognition by a proximity sensor is provided. The electronic device includes a display, a proximity sensor disposed under the display, at least one processor operatively connected with the display and the proximity sensor, and a memory operatively connected with the processor. The memory stores instructions that, when executed, cause the at least one processor to in response to the display being turned on, detect a light entering the proximity sensor by using the proximity sensor, calibrate a reference range, based on a characteristic of the entering light, and identify whether an external object is close to the electronic device, based on the calibrated reference range.