Foldable Device Brightness Control via Sensor Fusion
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Solution Overview
Problem
Foldable mobile electronic devices experience user discomfort due to sudden brightening of the display screen when transitioning from a folded to an unfolded state, caused by the light sensor's limited field of view and hysteresis adjustment operations.
Innovation Solution
Incorporating a first sensor to detect the angle between the device's housings and a second sensor to measure ambient illuminance, with a processor that performs real-time and hysteresis adjustments based on these readings to smoothly adjust the display brightness during state changes, preventing sudden changes in brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If hysteresis adjustment operation is performed based on wake-up illuminance, then display brightness can be adjusted according to ambient light conditions, but sudden brightening occurs when device transitions from folded to unfolded state causing user discomfort
Solution Approach 1:
The system performs preliminary action by detecting the folding state change before completing the hysteresis adjustment. When the folding state change detection unit detects that the device is transitioning from folded to unfolded state, it temporarily suspends the hysteresis adjustment operation to prevent sudden brightening. This allows the system to prepare for the state change and adjust brightness smoothly after the transition is complete.
Solution Approach 2:
The folding state change detection unit acts as an intermediary between the illuminance detection and brightness control systems. It monitors the physical state of the device and mediates the brightness adjustment process by determining when hysteresis adjustment should be suspended or performed, thereby preventing the harmful effect of sudden brightening during transitions.
2Measurement precision
If light sensor is disposed in the first housing to measure ambient illuminance, then brightness adjustment is possible, but the sensor's field of view is blocked when device is folded leading to inaccurate measurements
Solution Approach 1:
The system dynamically adjusts its operation based on the folding state. The folding state change detection unit continuously monitors whether the device is in folded or unfolded state, and the brightness control unit dynamically suspends or performs hysteresis adjustment accordingly. This dynamic adaptation ensures accurate brightness control regardless of the sensor's field of view availability in different device configurations.
Solution Approach 2:
The system implements feedback by using the folding state change detection unit to provide information about device configuration to the brightness control unit. Based on this feedback, the system determines whether to perform hysteresis adjustment or suspend it, creating a closed-loop control system that adapts to changing physical conditions and maintains 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
This solution effectively reduces user eye discomfort by gradually adjusting the screen brightness as the device unfolds, maintaining a comfortable viewing experience by leveraging multiple sensors and intelligent processing.
Implementation Method 1
The mobile electronic device may measure an ambient illuminance using a light sensor (or referred to as an illuminance sensor)
Implementation Method 2
the mobile electronic device may perform a hysteresis adjustment operation. For example, when the wake-up illuminance is 10 lux, a lower limit hysteresis and an upper limit hysteresis may be set to 1 lux and 81 lux, respectively
Data Source
AI summary
A foldable mobile electronic device is provided. The foldable mobile electronic device includes a processor configured to recognize, based on the data received from the first sensor, a change in a state of the foldable mobile electronic device from the folded state to a partially folded state before reaching an unfolded state, to identify a first illuminance by using the data received from the second sensor, based on the recognized state change, to set a first luminance corresponding to the first illuminance as a brightness of the display, to when an angle identified after the state change falls within a predetermined first angle range or when a specific time has not elapsed after the state change, perform a real-time adjustment operation on the brightness of the display, based on a second illuminance identified using the second sensor, and to when the angle identified after the state change is outside the first angle range or when the specific time has elapsed after the state change, perform a hysteresis adjustment operation on the brightness of the display, based on the first illuminance.