Position Detection Sensor Layout Around Through Holes for Fingerprint Access
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Solution Overview
Problem
Position detection sensors in portable electronic devices are obstructed by electromagnetic shielding materials, reducing their effective detection region and interfering with components like ultrasonic fingerprint sensors, which cannot function properly when positioned behind the sensor.
Innovation Solution
A position detection sensor with through holes in the insulating substrate allows components like fingerprint sensors to be placed behind it without obstruction, with position detection electrodes arranged to bypass these holes, maintaining effective detection regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a position detection sensor is arranged on the back side of the display apparatus to enable full display region as input surface, then the effective detection region is improved, but components like fingerprint sensors on the back side are disrupted by electromagnetic shielding materials
Solution Approach 1:
The position detection sensor is divided into multiple independent sensor units arranged in a matrix pattern. Each sensor unit can independently detect position information, and the shielding structure can be selectively applied to specific regions without affecting the entire sensor array. This segmentation allows fingerprint sensors to be placed in regions where shielding is not applied, while maintaining full display region detection capability.
Solution Approach 2:
Electromagnetic shielding materials are applied selectively only in specific regions where fingerprint sensors are located, rather than covering the entire back side of the display apparatus. This local application of shielding maintains the detection functionality in non-shielded regions while providing necessary shielding for fingerprint sensor operation in designated areas.
2Object-affected harmful factors
If electromagnetic shielding materials are provided in the position detection sensor, then electromagnetic interference is reduced, but the effective detection region is reduced and fingerprint sensor function is disrupted
Solution Approach 1:
The shielding structure is segmented into multiple independent shielding elements corresponding to individual sensor units or groups of sensor units. This allows electromagnetic shielding to be applied locally to specific regions without blocking the entire detection area, maintaining both interference reduction and detection coverage.
Solution Approach 2:
The patent introduces a selective shielding structure that acts as an intermediary between the position detection sensor and fingerprint sensor. This shielding structure is designed with specific geometric patterns that allow electromagnetic fields used for position detection to pass through while blocking interference that would affect fingerprint sensor operation, thus mediating between the two functional requirements.
3Reliability
If components are arranged in edge regions to avoid shielding disruption, then component function is maintained, but the effective detection region of the position detection sensor is reduced
Solution Approach 1:
The patent transitions from two-dimensional planar arrangement where components must be placed in edge regions, to a three-dimensional layered structure where position detection sensors, display elements, and fingerprint sensors are arranged in different vertical layers. This vertical stacking allows all components to coexist without spatial conflict, enabling full display region detection while maintaining component functionality through selective shielding in specific vertical zones.
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
The solution enables the full display region to function as an input surface while allowing components like fingerprint sensors to operate effectively, enhancing the usability and functionality of portable electronic devices.
Implementation Method 1
a position detection sensor based on, for example, an electromagnetic induction system
Data Source
AI summary
A position detection sensor allows for providing, on a back side of the position detection sensor, a component that needs to be accessed from a front side thereof. The position detection sensor includes a plurality of position detection electrodes arranged on an insulating substrate, wherein a region provided with the plurality of position detection electrodes forms an effective detection region for detecting an indicated position of a position indicator. A through hole in a predetermined shape is formed in the insulating substrate in the effective detection region. The position detection electrodes are arranged to bypass the through hole along the shape of the through hole at an area intersecting the through hole.