Under-Display Sensor Switching for Illuminance and Color Temperature
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Solution Overview
Problem
Existing electronic devices face challenges in efficiently measuring ambient illuminance and color temperature using sensors, particularly when adjusting screen color based on environmental light conditions.
Innovation Solution
The electronic device incorporates a sensor with multiple light receiving elements and analog-to-digital converters (ADCs) configured to operate in different modes, connecting light receiving elements to ADCs in series at designated times to measure illuminance and color temperature accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple light receiving elements are connected to multiple ADCs in parallel for simultaneous measurement, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The sensor operates in segmented time periods: a first time period for illuminance measurement where light receiving elements are connected in series to a first ADC, and a second time period for color temperature measurement where light receiving elements are connected to respective second ADCs. This temporal segmentation allows precise measurement of both parameters while reducing circuit complexity by reusing hardware components at different times.
Solution Approach 2:
The circuit configuration dynamically switches between two modes: a first mode during the first time period where switches connect light receiving elements in series to the first ADC for illuminance measurement, and a second mode during the second time period where switches connect light receiving elements to corresponding second ADCs for color temperature measurement. This dynamic reconfiguration enables the system to adapt its measurement architecture to the specific measurement task, optimizing both precision and complexity management.
2Measurement precision
If light receiving elements remain continuously active for accurate measurement, then measurement precision is improved, but energy consumption increases
Solution Approach 1:
The sensor employs periodic action by dividing operation into distinct time periods: a first time period dedicated to illuminance measurement and a second time period dedicated to color temperature measurement. Light receiving elements are activated only during their designated measurement period rather than continuously, thereby maintaining measurement precision for each parameter while significantly reducing overall energy consumption through periodic rather than continuous operation.
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 configuration allows for precise measurement of ambient illuminance and color temperature, enhancing the device's ability to adapt screen color to environmental lighting conditions effectively.
Implementation Method 1
a plurality of light-receiving elements include a first light receiving element, a second light receiving element, and a third light receiving element configured to detect light of different wavelengths
Data Source
AI summary
An electronic device is provided. The electronic device includes a display, a sensor, disposed on a lower end portion of the display, including a plurality of light-receiving elements, a plurality of analog-to-digital converters (ADCs), and a plurality of switches, memory, comprising one or more storage media, storing instructions, and one or more processors, wherein instructions, when executed by the one or more processors, cause the electronic device to control the plurality of switches to connect the first light-receiving element, the second light-receiving element and the third light-receiving element in series to the first ADC in a first mode in which the plurality of light-receiving elements are activated at designated time intervals during a first time period, and control the plurality of switches to connect the first light-receiving element is connected to the first ADC, the second light-receiving element to the second ADC and the third light-receiving element to the third ADC in a second mode in which the plurality of light-receiving elements remain active during a second time period.