Ambient Light Sensor Synchronization Under Display Screen
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Solution Overview
Problem
Existing electronic systems face challenges in accurately measuring ambient light due to the ambient light sensor being distorted by the light emitted from the screen, especially when the sensor is disposed under the screen or along its edge, leading to inaccurate adjustment of screen brightness and energy consumption.
Innovation Solution
Implementing a synchronization mechanism where the measurement phase of the ambient light sensor is synchronized with a phase where the screen does not emit light, allowing for precise measurement of ambient light without interference from screen emissions, using a control circuit and processing unit to manage binary control signals and synchronization signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the ambient light sensor is disposed under the screen or along the edge of the screen to enable integration without dedicated openings, then the ease of manufacture and device integration are improved, but the measurement precision deteriorates because the sensor cannot distinguish between light emitted by the screen and surrounding light passing through the screen
Solution Approach 1:
The screen is controlled to alternate between emitting light and not emitting light in periodic phases. The ambient light sensor is synchronized to measure light only during the phases when the screen does not emit light, thereby eliminating interference from screen emissions and achieving precise ambient light measurement while maintaining sensor integration under the screen
2Productivity
If the sensor continuously measures light to provide real-time ambient light data, then the responsiveness and productivity are improved, but the measurement precision deteriorates due to continuous interference from screen emissions
Solution Approach 1:
Instead of continuous measurement, the system uses periodic measurement phases synchronized with the screen's emission cycles. The sensor measures ambient light during specific time windows when the screen is off, providing accurate measurements at regular intervals without continuous interference from screen emissions
3Illumination intensity
If the screen emits light continuously to provide good visibility, then the illumination intensity is improved, but the measurement precision of ambient light deteriorates because the sensor cannot distinguish screen light from ambient light
Solution Approach 1:
The screen operates in periodic emission phases providing visibility during on-phases, followed by off-phases during which the synchronized sensor performs ambient light measurements. This periodic operation allows the screen to maintain good visibility during emission while enabling precise ambient light measurement during non-emission phases
Solution Approach 2:
The system maintains continuous useful action by rapidly alternating between screen emission phases (providing visibility) and measurement phases (providing ambient light data). The high-frequency switching ensures that both functions - screen visibility and ambient light measurement - are continuously performed with minimal interruption to either
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 enables accurate adjustment of screen brightness based on ambient light levels, improving user perception and energy efficiency by preventing screen emissions during measurement phases, thus minimizing distortion and enhancing the accuracy of light power adjustment.
Implementation Method 1
a light sensor disposed under the screen or along the edge of the screen, and configured to provide a measurement signal representative of a quantity of light received by the sensor
Data Source
AI summary
An electronic system includes a control circuit to provide a binary control signal alternating between a first binary state during first phases and a second binary state during second phases; a screen controlled by the control signal, the screen emitting light during each first phase, and to not emit any light during each second phase; a light sensor under the screen or along the edge of the screen, and providing a measurement signal representative of a quantity of light received by the sensor during a measurement phase or a plurality of consecutive measurement phases; and a synchronization device to synchronize each measurement phase with a second phase.