Display-Integrated Illuminance Sensing Without Screen Light Interference
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Solution Overview
Problem
Existing electronic devices struggle to accurately measure ambient light intensity using illuminance sensors due to interference from display light output, leading to inaccurate display luminance adjustments.
Innovation Solution
The electronic device incorporates an illuminance sensor with a photodiode disposed at the rear or side of the display, a capacitor for voltage accumulation, and a conversion element to process signals, along with a processor to manage time intervals and duty ratios for precise illuminance measurement, minimizing interference from display light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the illuminance sensor is placed near the display to enable compact design, then device size is reduced, but measurement accuracy deteriorates due to display light interference
Solution Approach 1:
The patent divides the sensor operation into distinct time segments: a first time period when the display is off and the sensor measures ambient light, and a second time period when the display is on. This temporal segmentation allows the sensor to capture accurate ambient illuminance data without interference from display light, while maintaining compact integration near the display.
Solution Approach 2:
The illuminance sensor performs periodic measurements during the display's off periods in a pulsed manner. The sensor is activated only during specific time windows when the display is not emitting light, creating a periodic measurement cycle that avoids continuous interference while maintaining measurement accuracy in a compact configuration.
2Productivity
If the illuminance sensor measures ambient light continuously, then real-time luminance adjustment is achieved, but measurement accuracy deteriorates due to display light interference
Solution Approach 1:
The system implements periodic illuminance measurements during the display's off periods rather than continuous measurement. This allows the sensor to capture accurate ambient light data in pulses synchronized with the display's off cycles, maintaining responsiveness while eliminating display light interference during measurement windows.
Solution Approach 2:
The illuminance sensor performs measurements during the display's off period before the display turns on. This preliminary measurement captures the true ambient illuminance level before display light contamination occurs, enabling accurate luminance adjustment calculations to be prepared in advance.
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 accurate ambient light measurement, enabling optimal display luminance adjustments based on ambient conditions, enhancing user experience by reducing glare and improving visibility.
Implementation Method 1
an illuminance sensor including a photodiode disposed at a rear or side of the display
Implementation Method 2
a capacitor electrically connected to the photodiode, the capacitor being cumulatively charged by the photodiode during the set plurality of time intervals
Data Source
AI summary
An electronic device is provided. The electronic device includes a display which displays a screen, visually exposed at the front, through at least a portion of a panel including a plurality of pixels, a display driver configured to control the on/off of the plurality of pixels of the display based on a designated scanning operation period or a designated duty ratio, a photodiode positioned behind or to one side of the display, an illuminance sensor including a capacitor electrically connected to the photodiode and a conversion element configured to acquire signals related to the voltage of the capacitor, memory, including one or more storage media, storing instructions, and at least one processor communicatively coupled to the display, the display driver, the illuminance sensor, and the memory, wherein the instructions, when executed by the at least one processor individually or collectively, cause the electronic device to transmit, to the illuminance sensor, signals related to a plurality of time intervals set based on the designated scanning operation period or the designated duty ratio, identify the signal related to the voltage of the capacitor cumulatively charged during the set plurality of time intervals by the photodiode, and obtain data related to illuminance based on the received signals related to the voltage of the capacitor.