Display Brightness Control Using Front and Rear Illuminance Sensors
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Solution Overview
Problem
Portable electronic devices face inconvenience due to the need for hysteresis adjustment of screen brightness when an illuminance sensor is covered by the user's hand or when in a backlight state, leading to inappropriate brightness settings that do not align with the peripheral environment.
Innovation Solution
The use of multiple illuminance sensors and a motion sensor to determine the device's state, allowing for automatic adjustment of display brightness based on the detected illuminance values and user interactions, ensuring optimal brightness settings regardless of the sensor's orientation or user handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single illuminance sensor is used to adjust display brightness, then the device can respond to environmental light changes, but the brightness adjustment becomes inaccurate when the sensor is covered by the user's hand or in backlight states
Solution Approach 1:
The patent divides the single illuminance sensing function into multiple sensors positioned at different locations (front surface and rear surface of the display). This segmentation allows the system to select appropriate sensor data based on device state, maintaining measurement accuracy even when one sensor is obscured by user interaction.
Solution Approach 2:
The system dynamically changes the parameter being measured by switching between different illuminance sensors based on detected device states (such as holding state, backlight state). When the front sensor is covered, the system switches to using the rear sensor, thereby maintaining accurate environmental light measurement despite changes in sensor accessibility.
2Illumination intensity
If hysteresis adjustment is performed based on illuminance sensor data, then the display brightness can be optimized for visibility, but inappropriate brightness settings occur when the sensor is obstructed or in backlight conditions
Solution Approach 1:
The system dynamically adjusts display brightness by transitioning between different brightness levels based on both illuminance sensor readings and device state detection. When holding or backlight states are detected, the system modifies the brightness adjustment behavior, ensuring reliable brightness settings that reflect actual viewing conditions rather than sensor obstruction.
Solution Approach 2:
The system uses feedback from multiple sources (illuminance sensors, motion sensors, touch sensors) to continuously monitor device state and adjust brightness accordingly. This multi-source feedback mechanism allows the system to distinguish between actual environmental light changes and sensor obstruction, maintaining reliable brightness control.
3Device complexity
If the illuminance sensor direction is fixed, then the device structure is simple, but the brightness adjustment becomes inappropriate when the sensor orientation opposes the light source direction
Solution Approach 1:
Instead of making a single sensor adaptable through complex mechanisms, the patent segments the sensing function across multiple fixed sensors at different orientations. This allows the system to maintain simple individual sensor structures while achieving overall adaptability by selecting appropriate sensor data based on device state.
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 enhances user convenience by maintaining appropriate screen brightness levels even when the illuminance sensor is obstructed or in backlight conditions, providing better alignment with the environmental brightness and user interactions.
Implementation Method 1
A portable electronic device may use an illuminance sensor to measure the peripheral illuminance
Implementation Method 2
the portable electronic device may configure the screen dark in a dark environment having a low peripheral illuminance, and may configure the screen bright in an environment having a relatively high peripheral illuminance
Data Source
AI summary
An electronic device configured to configure brightness of a display by using an illuminance sensor is provided. The electronic device includes acquiring a second front-surface sensing value smaller than a first front-surface sensing value through a first illuminance sensor while the brightness is a first brightness, comparing the second front-surface sensing value with a first rear-surface sensing value detected through a second illuminance sensor, determining, when the second front-surface sensing value is greater than the first rear-surface sensing value, whether a touch input is detected through a designated region of the display, maintaining the brightness at the first brightness when the touch input is detected, and when the touch input is not detected, adjusting the brightness of the display to a value lower than that of the first brightness, based on a first LUT stored in a memory, or maintaining the brightness of the display at the first brightness.