Under-Display Ambient Light Sensor Brightness Modulation
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Solution Overview
Problem
The challenge is to accurately sense ambient light in electronic devices with OLED displays, where the ambient light sensor is positioned under the screen, as the light emitted by the display interferes with the detection and the available space for the sensor is limited, especially with increasing screen-to-body ratios.
Innovation Solution
An electronic device with an OLED display and an ambient light sensing method that involves an ambient light sensor positioned under the display area, which changes its brightness coefficients to generate two sensing values, allowing the calculation of ambient light intensity using these values and the corresponding brightness coefficients, while maintaining constant saturation of the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the ambient light sensor is disposed under the display to achieve high screen-to-body ratio, then the screen-to-body ratio is improved, but the display light interferes with the ambient light detection
Solution Approach 1:
The patent applies periodic action by switching the display area between different brightness states (first brightness coefficient and second brightness coefficient) at different time points. The ambient light sensor measures light intensity at these different brightness states, and through computational processing of these periodic measurements, the ambient light intensity is calculated while eliminating the interference from display light.
Solution Approach 2:
The patent changes the brightness parameter of the display area dynamically. By adjusting the brightness coefficient between two different values (first brightness coefficient and second brightness coefficient) and measuring the corresponding light intensities, the system creates a system of equations that allows separation of ambient light from display light through mathematical calculation.
2Ease of manufacture
If the ambient light sensor is disposed under the display, then the space utilization is improved, but the light emitted by the display affects the detection accuracy
Solution Approach 1:
The patent implements feedback by using the measurements taken at different brightness states to calculate and determine the actual ambient light intensity. The system feeds back the relationship between display brightness and measured light intensity to computationally extract the ambient light component, thereby compensating for the interference caused by the display light.
Solution Approach 2:
The patent introduces computational processing as an intermediary between the raw sensor measurements and the final ambient light value. By using algorithms to process the measurements taken at different brightness coefficients, the system mediates the interference effect and extracts the true ambient light information from the combined signal.
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 method enables accurate ambient light sensing without interference from the OLED display's emitted light, allowing for effective light regulation and maintaining a high screen-to-body ratio.
Implementation Method 1
an OLED display including a first display area, wherein a saturation of the first display area remains constant in a first period; a display driver coupled to the OLED display, wherein the display driver changes a brightness coefficient of the first display area from a first brightness coefficient to a second brightness coefficient during the first period
Implementation Method 2
an ambient light sensor under the first display area for sensing light, wherein during the first period, the ambient light sensor senses light to generate a first sensing value when the brightness coefficient of the first display area is the first brightness coefficient and the ambient light sensor senses light to generate a second sensing value when the brightness coefficient of the first display area is the second brightness coefficient
Data Source
AI summary
An electronic device includes: a OLED display including a first display area, wherein a saturation of the first display area remains constant in a first period; a display driver for driving the OLED display and changing a brightness coefficient of the first display area from a first brightness coefficient to a second brightness coefficient during the first period; an ambient light sensor under the first display area for sensing light, wherein during the first period, the ambient light sensor generates a first sensing value when the brightness coefficient of the first display area is the first brightness coefficient and generates a second sensing value when the brightness coefficient of the first display area is the second brightness coefficient; and a controller for calculating an ambient light intensity according to the first brightness coefficient, the second brightness coefficient, the first sensing value and the second sensing value.