Back-Side Illuminance Sensor Timing Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Illuminance sensors mounted at the back side of a display in electronic devices face performance degradation due to interference from the display's light output, leading to reduced accuracy in measuring external illuminance.
Innovation Solution
The electronic device adjusts the display's brightness and identifies associated display parameter information to set an optimal measuring time for the illuminance sensor, acquiring and processing raw data to generate accurate illuminance values by synchronizing the sensor's operation with the display's off intervals and using AMOLED off ratios to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the illuminance sensor is mounted at the back side of the display, then the display area can be maximized and the black matrix area minimized, but the sensor performance deteriorates due to interference from display light output
Solution Approach 1:
The system performs preliminary actions by turning off the display before the illuminance sensor takes measurements. The controller identifies when the display is in an off state and schedules illuminance measurements during these intervals, ensuring that no display light interferes with the measurement process. This preliminary timing coordination resolves the contradiction by eliminating the harmful light interference while maintaining the sensor's back-side mounting position.
Solution Approach 2:
The system employs periodic action by repeatedly turning the display on and off at scheduled intervals. During the off periods, the illuminance sensor performs measurements. This periodic cycling allows the sensor to capture ambient light data without interference from continuous display emission, thereby maintaining measurement precision while keeping the sensor mounted at the display back side.
2Device complexity
If the illuminance sensor is mounted at the back side of the display, then device integration is improved, but external light input to the sensor is reduced
Solution Approach 1:
The controller performs preliminary actions by turning off the display before illuminance measurements are taken. This ensures that during the measurement window, the sensor receives maximum external light without obstruction from display emission. The timing coordination allows the sensor to capture external light conditions accurately despite its back-side mounting position that limits direct light exposure.
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 approach enhances the accuracy and reliability of illuminance measurements by reducing the impact of display light on the sensor, allowing for precise external light detection.
Implementation Method 1
an illuminance sensor disposed between the display and the back side of the housing to overlap at least one active area of the display in a top view from above the front side
Data Source
AI summary
Provided is an electronic device. The electronic device includes a housing that includes a front side and a back side, a display, an illuminance sensor overlapping at least one active area of the display in a top view from above the front side, at least one processor, and a memory. The memory stores instructions that, when executed, cause the at least one processor, while the display is in operation, to change a brightness of a screen displayed on the display, to identify display parameter information associated with the changed brightness, to set a measuring time of the illuminance sensor, based at least partially on the identified display parameter information, to acquire raw data measured during the measuring time by the illuminance sensor at a specified period, to generate intermediate data using the acquired raw data, and to calculate an illuminance value using the generated intermediate data.