Under-Display Light Sensor Backside Leakage Mitigation
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Solution Overview
Problem
Electronic devices with displays and embedded sensors, such as proximity sensors, face interference issues due to light emitters causing display artifacts, even when using non-visible wavelengths like infrared, which affect the display's functionality and appearance.
Innovation Solution
Incorporating a display light sensor behind the display to measure backside light leakage and adjust the light emitter's timing, dosage, or the display's settings to mitigate these artifacts, forming a closed-loop system that maintains acceptable display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a light emitter is integrated behind the display to enable under-display sensor functionality, then the sensor can operate through the display, but display artifacts are caused by light interference with display circuitry
Solution Approach 1:
A light sensor is positioned behind the display to detect light leakage and artifacts in real-time. The detected artifact information is fed back to control circuitry, which then adjusts the light emitter's operation (timing, intensity, dosage) to reduce artifacts while maintaining sensor functionality. This closed-loop feedback system enables the light emitter to operate through the display without causing unacceptable visual interference.
Solution Approach 2:
The light emitter operates in a controlled periodic manner, with its activation timing adjusted based on display refresh cycles and artifact detection. By synchronizing or desynchronizing light emission with display updates, the system minimizes interference while maintaining necessary sensor measurements through the display.
2Measurement precision
If the light emitter operates at high intensity to ensure accurate sensor measurements, then measurement accuracy improves, but display artifacts become more prominent
Solution Approach 1:
The light sensor continuously monitors the display for artifacts caused by light emitter intensity. Based on this feedback, the control circuitry dynamically adjusts the light emitter's intensity level, increasing it when measurements require higher precision and decreasing it when artifact visibility becomes problematic, thus optimizing the balance between measurement accuracy and display quality.
Solution Approach 2:
The light emitter's operating parameters (intensity, timing, duration) are made dynamic rather than static, allowing real-time adjustment based on detected artifact levels and measurement requirements. This dynamic control enables the system to adapt to different operating conditions and maintain optimal performance.
3Object-affected harmful factors
If the light emitter timing is adjusted to reduce display artifacts, then display quality improves, but sensor measurement timing flexibility is reduced
Solution Approach 1:
The system utilizes the periodic nature of display refresh cycles to schedule light emitter operation. By aligning light emission with specific phases of the display cycle (such as blanking periods or low-activity intervals), the system reduces artifacts while maintaining the ability to perform measurements at various logical time points in the sensor operation cycle.
Solution Approach 2:
The timing parameters of the light emitter are dynamically adjusted based on real-time artifact detection and display state monitoring. This allows the system to optimize timing for artifact reduction while preserving measurement timing flexibility through adaptive control rather than fixed scheduling.
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 display artifacts to an undetectable level, ensuring the device's functionality and user experience are not compromised by the sensor's operation, while allowing for the use of under-display sensors without interfering with the display.
Implementation Method 1
a sensor (such as a proximity sensor) with a light emitter that emits light through the display
Implementation Method 2
a display light sensor under the display may measure backside light leakage from the display
Data Source
AI summary
A light emitter that operates through a display may cause display artifacts, even when the light emitter operates using non-visible wavelengths. To determine whether the light emitter has caused these artifacts, a display light sensor under the display may measure backside light leakage from the display. Based on the measured backside light leakage, the display light sensor or control circuitry may determine whether artifacts in the display exceed a predetermined acceptable artifact range. If the artifacts exceed this range, the artifacts may be mitigated. To mitigate the artifacts, the light emitter and/or the display may be adjusted. For example, the timing and/or dosage of the light emitter, the acceptable artifact range, and/or the timing of display content may be adjusted. In this way, the display light sensor may be used to form a closed-loop system to determine whether artifacts are present in the display and to mitigate those artifacts.