Optical Digital Pen Light Scattering for Tilted Positioning
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Solution Overview
Problem
Optical digital pens struggle to accurately acquire positional information when used at a tilt on display panels with smooth surfaces, as the reflected light is not sufficiently transmitted to the IR light receiving unit due to the uniform reflection of light at symmetrical angles, leading to reduced operational effectiveness on devices like tablet PCs and laptop computers.
Innovation Solution
The optical digital pen employs a lateral and downward light scattering mechanism, utilizing an IR light scattering member and optical fiber members to scatter and guide light in various directions, ensuring that reflected light reaches the IR light receiving unit even when the pen is tilted on a smooth surface, thereby enhancing light transmission and positional information acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical digital pen uses a conventional light reflection method on a smooth surface, then the device structure is simple, but the light is reflected uniformly at symmetrical angles causing insufficient light transmission to the IR light receiving unit when tilted
Solution Approach 1:
The patent introduces a light scattering member as an intermediary component between the light source and the display panel. This member scatters the light in multiple directions before it reflects off the smooth surface, ensuring that some scattered light reaches the IR light receiving unit even when the pen is tilted. The light scattering member acts as a mediator that transforms the uniform reflection problem into a multi-directional light distribution solution.
Solution Approach 2:
The patent changes the light propagation from a single-dimensional reflection path to a multi-dimensional scattered path. By introducing light scattering in multiple directions (upward, lateral, downward), the system transitions from relying on a single reflection angle to utilizing light paths from multiple spatial dimensions, thereby ensuring light reaches the receiver regardless of pen tilt angle.
2Ease of operation
If the optical digital pen operates on a smooth surface without light scattering, then the device complexity is low, but the operational effectiveness is reduced when the pen is tilted
Solution Approach 1:
The light scattering member serves as an intermediary that enables effective operation at tilt angles. It scatters light in multiple directions including upward, lateral, and downward directions, ensuring that regardless of the pen's tilt angle, some scattered light reaches the IR light receiving unit, thereby maintaining operational effectiveness without requiring complex mechanical adjustments.
Solution Approach 2:
The patent changes the light distribution parameters by introducing scattering angles in multiple directions (upward, lateral, downward). This parameter change transforms the light propagation characteristics from uniform reflection to multi-directional scattering, enabling effective operation across a range of tilt angles while keeping the structural complexity manageable.
3Loss of energy
If the optical digital pen uses uniform light reflection on smooth surfaces, then the manufacturing cost is low, but the light transmission to IR light receiving unit is insufficient when tilted
Solution Approach 1:
The light scattering member acts as an intermediary that improves light transmission efficiency by scattering light in multiple directions. This ensures that more light reaches the IR light receiving unit compared to uniform reflection, reducing energy loss while maintaining relatively simple device structure through the use of a single scattering component.
Solution Approach 2:
The patent introduces multi-dimensional light scattering (upward, lateral, downward directions) to improve light transmission efficiency. This dimensional change in light propagation ensures that scattered light reaches the receiver from multiple angles, maximizing energy utilization while keeping the added structural complexity minimal.
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 solution allows the optical digital pen to effectively operate on smooth surfaces by increasing the amount of reflected light received, ensuring reliable positional information acquisition and compatibility with larger electronic devices such as tablet PCs and laptop computers.
Implementation Method 1
a lateral light scattering member which is disposed at a tilt to be close to the pen tip member and be directed toward the display panel, between the IR light emitting member and the display panel, wherein the lateral light scattering member scatters light irregularly in several directions with respect to the display panel in a process of transmitting or reflecting the light generated by the IR light emitting member
Implementation Method 2
a downward light scattering member which is disposed to face a front surface of the display panel, with the pen body member being bent between the IR light emitting member and the display panel, wherein the downward light scattering member scatters light generated by the IR light emitting member irregularly in several directions with respect to the display panel
Implementation Method 3
a lateral optical fiber member which is disposed in a length direction along the pen body member, wherein the lateral optical fiber member guides the light generated by the IR light emitting member to the lateral light scattering member; a downward optical fiber member which guides the light generated by the IR light emitting member to the downward light scattering member
Implementation Method 4
The light radiated from the IR light emitting unit 17 is reflected from the surface of the display panel 200
Data Source
AI summary
The present invention generally relates to a structure of an optical digital pen. In particular, the invention relates to an optical digital pen by use of light scattering which can effectively acquire positional information of a pen tip even when the optical digital pen moves at a tilt on a display panel having a smooth surface. The invention is advantageous in that even when an optical digital pen is used at a tilt on a panel having a smooth surface made of glass or transparent plastic, reflected light for acquiring positional information of a pen tip is sufficiently received. In addition, the optical digital pen has an advantage of being compatibly used with a display panel of an electronic device such as a tablet PC or a laptop computer.