Ambient Light Sensor Placement in Display Pixels
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing full-screen terminals face challenges in accurately determining ambient light luminance due to the difficulty in acquiring the luminance value of the display screen, which affects the accuracy of ambient light luminance measurement.
Innovation Solution
An apparatus comprising luminance sensors, inverse controllers, and a processor is used to control pixels on the display screen to display as black, allowing the luminance sensors to determine ambient light luminance without needing the display screen's luminance value, improving accuracy by isolating the ambient light signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If luminance sensors are arranged at the forehead part of the terminal, then the ambient light luminance can be measured, but the display screen area is reduced
Solution Approach 1:
The patent moves the luminance sensor arrangement from the traditional forehead area to the lower part of the display screen, utilizing the vertical dimension of the display area. This allows the sensors to be positioned within the display boundaries rather than in the forehead region, thereby increasing the effective display screen area while maintaining measurement capability through strategic pixel control.
Solution Approach 2:
The patent extracts the measurement function from the forehead sensor arrangement and integrates it into the display screen's pixel system. By using specific pixels (first pixels) in the lower part of the display that can be independently controlled to display black, the system separates the measurement function from the traditional sensor location, allowing full utilization of the display area.
2Measurement precision
If the display screen luminance value is included in the measurement, then the measurement process is simplified, but the ambient light luminance accuracy deteriorates
Solution Approach 1:
The patent extracts the ambient light signal from the total luminance measurement by having the display pixels display black during measurement. This isolates the ambient light component that passes through the black pixels, eliminating the need to mathematically separate it from the display luminance. The measurement process becomes simpler while achieving higher accuracy, as the black pixel state naturally filters out display contribution.
Solution Approach 2:
The patent performs a preliminary action by controlling the first pixels to display black before the luminance measurement is taken. This preparatory step ensures that when the luminance sensor measures the light passing through these pixels, only ambient light is detected, not display luminance. This preliminary black-state configuration simplifies the subsequent measurement process and eliminates the need for complex luminance subtraction calculations.
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 of ambient light luminance determination by isolating the ambient light signal, eliminating the need to measure the display screen's luminance and improving the reliability of ambient light measurements.
Implementation Method 1
acquire an optical signal transmitting through the display screen
Data Source
AI summary
An apparatus configured to determine ambient light luminance includes: m luminance sensors, m groups of inverse controllers and a processor, wherein the inverse controllers are configured to control luminance of first pixels in n rows of pixels in a display screen, the n rows of pixels including m groups of target pixel rows, each group of the target pixel rows including the first pixels, the first pixel in an ith group of target pixels rows being a pixel located above an ith luminance sensor; the first pixels in the ith group of target pixel rows are correspondingly coupled to an ith group of inverse controllers, and the processor is coupled to the m groups of inverse controller and the m luminance sensors, wherein m is less than or equal to n, and i is a positive integer.