Foldable Display Illuminance Sensor Calibration for Brightness Consistency
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Solution Overview
Problem
Existing electronic devices with illuminance sensors face challenges in maintaining consistent screen brightness across different devices due to variations in sensor performance, assembly tolerances, and display transmittance, leading to differences in measured illuminance values.
Innovation Solution
A portable electronic device with a foldable housing includes a first and second display area, a first illuminance sensor, a state detection sensor, memory, and a processor. The processor calibrates the illuminance sensor by storing a reference value, recognizing the device's folded state, displaying specific images, calculating an illuminance value, and determining a calibration value to standardize measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If illuminance sensors are used to control screen brightness, then screen brightness can be adjusted according to external environment, but measured illuminance values vary between devices due to sensor performance differences, assembly tolerances, and display transmittance variations
Solution Approach 1:
The patent applies parameter changes by introducing a calibration value that modifies the raw illuminance measurement. The processor calculates a calibration value based on the ratio between a reference illuminance value (measured under controlled conditions) and the actual illuminance value (measured in operating conditions). This calibration value is then used to adjust subsequent illuminance measurements, transforming the measurement parameter to compensate for device-specific variations in sensor performance, assembly tolerances, and display transmittance.
2Reliability
If different illuminance sensors are installed in electronic devices, then each device can measure external illuminance independently, but the measured values differ due to performance differences and deterioration degrees
Solution Approach 1:
The patent implements feedback by continuously monitoring the illuminance measurements and comparing them against expected values. The calibration process establishes a baseline relationship between reference measurements and actual measurements. This feedback mechanism allows the system to automatically adjust for sensor variations and deterioration over time, maintaining measurement consistency across different devices and throughout their operational lifespan.
3Productivity
If assembly tolerances vary for each device, then manufacturing can be simplified and faster, but the illuminance sensor positioning and display transmittance vary, affecting measurement accuracy
Solution Approach 1:
The patent applies self-service by enabling each device to automatically calibrate its own illuminance sensor during normal operation. The calibration process uses the device's own display and sensor to establish a reference relationship, eliminating the need for external calibration equipment or manual adjustment. This self-calibration approach compensates for assembly tolerance variations without requiring tighter manufacturing tolerances, thus maintaining manufacturing productivity while improving measurement accuracy.
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
The calibration process ensures that the electronic device maintains consistent screen brightness in the same external environment, reducing variations caused by differences in sensor performance and assembly tolerances.
Implementation Method 1
a first illuminance sensor disposed under the first display area and having a field of view facing the first display area
Data Source
AI summary
A portable electronic device includes a foldable housing; a display; an illuminance sensor; a state detection sensor; a memory; and a processor. Based on data received from the state detection sensor, the portable electronic device is recognized to be in the folded state. Responsive to the portable electronic device being in a calibration trigger state which includes the folded state, a first image is displayed in a sensor area of a first display area located on the illuminance sensor, and a second image is displayed in an area of the second display area facing the sensor area. An illuminance value is calculated based on data received from the illuminance sensor while the first image and the second image are displayed, and then compared to a reference value stored in the memory to calculate a calibration value for calibrating measured illuminance values of the illuminance sensor.