Electronic Pen Shock-Absorbing Mechanism for Foldable Displays
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Solution Overview
Problem
The use of electronic pens on foldable terminals poses a risk of damaging the soft OLED display screens due to the higher pressure applied by the pen tip, and existing designs may lose pen pressure detection accuracy due to a long core body that can bend and rub against the casing.
Innovation Solution
An electronic pen with a rod-shaped core body and a shock-absorbing mechanism that includes a piston spring and cylinder portion, which absorbs pressures above a predetermined value, ensuring that the pen pressure is accurately detected and preventing excessive pressure from being applied to the operation surface, while maintaining conductivity for signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a pen tip is formed of a relatively soft material, then the electronic pen can be used on foldable terminals, but the pen tip is harder and sharper than a user's fingertip, causing large pressure per unit area that may damage the operation surface
Solution Approach 1:
A shock-absorbing mechanism is introduced as an intermediary component between the pen tip and the operation surface. This mechanism includes a pressurizing member with a spring that absorbs excessive pressure, allowing the pen tip to be soft enough for foldable terminals while preventing damage to the OLED display by mediating the pressure transmission.
Solution Approach 2:
The shock-absorbing mechanism provides beforehand cushioning by pre-loading a spring in the pressurizing member. This spring is compressed before contact with the operation surface, creating a cushioning effect that prevents excessive pressure from reaching the soft OLED display, thus protecting it from damage in advance.
2Measurement precision
If the core body is made long to accommodate the pen pressure detector, then pen pressure detection is enabled, but the core body may be bent when pen pressure is applied, causing the core body to rub against the surrounding wall surface and resulting in loss of pen pressure
Solution Approach 1:
The core body is segmented into multiple functional sections: a signal transmission section (rod-shaped core body), a pressure transmission section (pressurizing member with piston), and a detection section (pen pressure detector). This segmentation allows the signal transmission path to remain straight and rigid while the pressure transmission path can flex independently, preventing the core body from rubbing against the casing wall.
Solution Approach 2:
A pressurizing member acting as an intermediary is introduced between the core body and the pen pressure detector. This pressurizing member includes a piston that transmits pressure through fluid or elastic deformation, allowing the core body to remain rigid for signal transmission while the intermediary absorbs the bending and friction issues.
3Strength
If a protective layer such as tempered glass is disposed on the position detection sensor, then the operation surface is protected, but foldable terminals cannot use soft OLED displays that can be folded
Solution Approach 1:
The electronic pen incorporates a shock-absorbing mechanism as an intermediary that compensates for the lack of tempered glass protection. This mechanism absorbs the excessive pressure that would otherwise damage the soft OLED display, enabling foldable terminals to use flexible screens without the need for rigid protective glass layers.
Solution Approach 2:
The pen tip material hardness parameter is adjusted to be softer than traditional pens, and the shock-absorbing mechanism modifies the pressure parameter dynamically. This allows the operation surface to remain unprotected (enabling foldability) while the pen adapts its pressure characteristics to prevent damage.
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 electronic pen effectively detects pen pressure without applying excessive load to foldable terminal screens, ensuring reliable operation and accurate pressure detection, even when used with foldable terminals that lack a protective tempered glass layer.
Implementation Method 1
a shock-absorbing mechanism which, in operation, when the pen pressure applied to the core body has a predetermined value or more, absorbs the pen pressure
Implementation Method 2
the signal from the signal transmitter, in operation, is supplied to the core body through the pen pressure transmitter and transmitted to an outside of the electronic pen through the core body
Data Source
AI summary
Provided is an electronic pen including a rod-shaped core body having conductivity, a pen pressure transmitter which is connected to the core body and has conductivity and which, in operation, transmits a pen pressure applied to the core body to a pen pressure detector, and a signal transmitter which, in operation, generates a signal to be transmitted from the core body, in which the pen pressure transmitter includes a shock-absorbing mechanism which, in operation, when the pen pressure applied to the core body has a predetermined value or more, absorbs the pen pressure, and the signal from the signal transmitter, in operation, is supplied to the core body through the pen pressure transmitter and transmitted to an outside of the electronic pen through the core body.