Position Detection Sensor Layout to Prevent E-Paper Pen Waving
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Solution Overview
Problem
Existing terminal devices using thin and flexible electronic paper as a display device experience a 'waving phenomenon' during drawing input with an electronic pen due to fluctuations in the distance between the pen tip and the sensor surface, leading to deteriorated drawing quality.
Innovation Solution
A position detection sensor is configured with an insulating substrate and first electrodes arranged in a direction, with linear members between electrodes to stabilize the pen tip, preventing up-and-down movement and smoothing the sensor surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If electronic paper is used as a thin and flexible display device, then the device becomes thinner and lighter, but the pen tip distance from the sensor surface fluctuates causing waving phenomenon
Solution Approach 1:
A buffer layer is introduced as an intermediary component between the electronic paper display and the position detection sensor. This buffer layer acts as a mediator that absorbs and compensates for the flexibility of the electronic paper, maintaining a stable distance between the pen tip and sensor surface regardless of the display's thin and flexible nature.
Solution Approach 2:
The invention changes the physical parameters of the sensor assembly by adding a buffer layer with specific mechanical properties (rigidity, thickness) that counterbalance the flexibility of the electronic paper. This parameter adjustment stabilizes the pen tip-to-sensor distance, eliminating the waving phenomenon while preserving the thin and light characteristics of the display device.
2Manufacturing precision
If the sensor surface is made flat for stable pen contact, then drawing precision improves, but the thin and flexible nature of electronic paper is compromised
Solution Approach 1:
The invention segments the sensor assembly into distinct functional layers: the flexible electronic paper display layer and the rigid position detection sensor layer, connected by a buffer layer. This segmentation allows each layer to maintain its inherent properties (flexibility for display, rigidity for precise detection) while working together as an integrated system.
Solution Approach 2:
The invention resolves the two-dimensional conflict between display flexibility and sensor flatness by introducing a third dimension - the buffer layer positioned between the display and sensor. This additional dimensional element provides the necessary mechanical decoupling, allowing the display to remain flexible while the sensor surface stays flat for precise pen contact.
3Reliability
If a buffer layer is added to stabilize the sensor surface, then the waving phenomenon is eliminated, but the device complexity increases
Solution Approach 1:
The buffer layer is implemented as a simple, inexpensive component (such as a thin rigid substrate or protective film) that provides the necessary mechanical stabilization without requiring complex mechanisms, active components, or expensive materials. This simple addition effectively eliminates the waving phenomenon while minimizing the increase in device complexity.
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 configuration ensures high-quality drawing input by maintaining a stable pen tip position, eliminating the waving phenomenon and enhancing drawing precision.
Implementation Method 1
A position detection device of the electromagnetic induction type includes a sensor in which a plurality of loop coils are arranged in each of the X-axis direction and the Y-axis direction. In a transmission period, current is sequentially supplied to the plurality of loop coils in the sensor to generate a magnetic field. In a reception period, the supply of the current is stopped and a magnetic field from the outside is received.
Implementation Method 2
The corresponding electronic pen includes a resonant circuit including a coil and a capacitor. Current flowing through the coil in response to the magnetic field from the sensor generates a signal.
Data Source
AI summary
There is provided a terminal device including electronic paper and a position detection sensor disposed on a lower side of a display screen of the electronic paper and configured to detect a position indicated by an electronic pen on the display screen. The position detection sensor includes an insulating substrate having a first surface on a side facing the display screen, and a plurality of first electrodes arranged in a first direction on the first surface of the insulating substrate. One or more first linear members extended in a direction along the first electrodes are arranged in each space between two of the first electrodes having a predetermined distance from each other in the first direction, among the plurality of first electrodes, on the first surface of the insulating substrate.