Foldable Display Reinforcing Plate With Slits for Precise Pen Detection
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Solution Overview
Problem
Flexible display elements in foldable mobile terminals lack sufficient strength and effective position detection due to the interference of reinforcing plates with electromagnetic induction type position detection sensors, leading to uneven signal transmission and reduced precision.
Innovation Solution
A reinforcing plate with uniformly distributed slits, extending in both vertical and horizontal directions, is interposed between the flexible display element and the electromagnetic induction type position detection sensor, maintaining stiffness and ensuring uniform signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a reinforcing plate is placed between the flexible display element and the electromagnetic induction type position detection sensor, then the strength of the mobile terminal is improved, but the transmission and reception of magnetic fluxes between the sensor and electronic pen is hindered
Solution Approach 1:
The reinforcing plate is segmented by forming multiple slits that extend in the horizontal direction, dividing the solid plate into multiple sections. This segmentation allows magnetic fluxes to pass through the slits while maintaining the overall structural strength of the reinforcing plate.
Solution Approach 2:
The slits act as intermediary channels that facilitate the passage of magnetic fluxes between the electromagnetic induction type position detection sensor and the electronic pen, mediating the interaction that would otherwise be blocked by the solid reinforcing plate.
2Reliability
If multiple slits are formed in the reinforcing plate to enable signal transmission, then position detection becomes possible, but the strength of the reinforcing plate is reduced
Solution Approach 1:
The slits are strategically positioned and oriented horizontally to align with the magnetic flux transmission path, while the vertical portions of the reinforcing plate maintain their full strength. This local modification approach ensures position detection capability where needed while preserving overall structural integrity.
3Reliability
If slits are arranged vertically in the conductor layer, then signal transmission is enabled, but uniform signal transmission across the operation surface is compromised
Solution Approach 1:
The slits in the reinforcing plate are oriented horizontally, which is asymmetric relative to the vertical slit arrangement in the conductor layer. This horizontal orientation creates a complementary pattern that ensures uniform magnetic flux distribution and signal transmission across the entire operation surface, improving position detection precision.
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 maintains the structural integrity of the foldable mobile terminal while enabling precise position detection without display unevenness or signal interference, allowing seamless operation with electromagnetic and capacitive type sensors.
Implementation Method 1
the electromagnetic induction type position detection sensor, in operation, detects a position pointed to on a display screen of the display element
Implementation Method 2
the sensor including loop coils extending in a horizontal direction of a display screen
Data Source
AI summary
Provided is an electronic device including a display element, a first position detection sensor of an electromagnetic induction type disposed on a back side of the display element, wherein the first position detection sensor, in operation, detects a position pointed to on a display screen of the display element, and a reinforcing plate interposed between the display element and the first position detection sensor and having a slit part corresponding to an entire surface of the display screen, the slit part having slits of a first type and of a second type, each of the first type of the slits extending in a vertical direction of the display screen and each of the second type of the slits extending in a horizontal direction of the display screen, the first and second types of the slits being provided uniformly in a manner having substantially the same opening dimensions.