Touch Screen Brightness Control Using Unblocked Light Sensors
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Solution Overview
Problem
Existing touch screen systems face inaccuracies in measuring ambient light due to light sensors being easily blocked by objects, leading to incorrect brightness control.
Innovation Solution
A method and device that utilize multiple ambient light sensors arranged in an array, where the number of unblocked sensors is determined to accurately measure ambient light, and the touch screen's brightness is controlled based on these sensors, excluding sensors in ineffective regions formed by objects and shadows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single light sensor is used to measure ambient light, then the device structure is simple, but the measurement accuracy deteriorates due to easy blocking by objects
Solution Approach 1:
The patent divides the single light sensing function into multiple light sensors arranged in an array. Each sensor independently measures ambient light, and the system segments the measurement task across multiple components to improve reliability and accuracy by selecting unblocked sensors.
Solution Approach 2:
Different regions of the light sensor array have different functional qualities. The patent identifies effective regions (unblocked sensors) and ineffective regions (blocked sensors) within the array, assigning different weights or selection statuses to different local areas based on their accessibility to ambient light.
2Reliability
If all light sensors are used for measurement, then the measurement data volume increases, but the reliability deteriorates due to inclusion of blocked sensors
Solution Approach 1:
The patent performs preliminary identification of effective and ineffective regions before final brightness calculation. By pre-selecting unblocked light sensors and excluding blocked ones, the system ensures reliable measurement data is used for brightness control, avoiding the need to process unreliable data from blocked sensors.
Solution Approach 2:
The patent extracts and excludes the ineffective region (blocked sensors) from the measurement process. By identifying and removing blocked sensors from the calculation, the system maintains high reliability by using only valid measurement data from unblocked sensors.
3Measurement precision
If light sensors are placed in a small hole on the housing, then the device structure is compact, but the measurement accuracy deteriorates due to easy blocking
Solution Approach 1:
Instead of using a single sensing point in a small hole, the patent segments the sensing function across multiple light sensors arranged in an array on the touch screen. This segmentation allows the system to identify and select unblocked sensors even when some positions are obscured by objects.
Solution Approach 2:
The patent transitions from a single-point sensing approach (0D/1D) to a two-dimensional array of sensors on the touch screen surface. This dimensional expansion provides spatial redundancy, allowing the system to detect and exclude blocked sensors while maintaining accurate ambient light measurement through unblocked sensors.
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 measurement and brightness control, improving the reliability of touch screen operations by selecting unblocked sensors and using algorithms to determine ineffective regions.
Implementation Method 1
When ambient light produced by a light source passes through the small hole and reaches the light sensor, the electronic device may measure the brightness value of the ambient light by the light sensor
Data Source
AI summary
The present disclosure relates to a method and device for controlling brightness of a touch screen of an electronic device. The method includes determining an object is operating on the touch screen; selecting a number N of sampling light sensors which are not blocked by an object from ambient light among the light sensors distributed on the touch screen, and controlling brightness of the touch screen based on the number N of sampling light sensors.