Light Pen Image Eraser for Electronic Writing Systems
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Solution Overview
Problem
Conventional electronic writing systems with large sizes are inconvenient due to high costs and limited functionality, particularly lacking a user-friendly eraser function that requires users to navigate long distances to select and activate the eraser icon.
Innovation Solution
An electronic writing system incorporating a display device with pixel and sensing regions, and an image eraser that generates a light with a mixture of colors to send an erasing signal directly to the display, allowing for immediate removal of images without the need to switch to the eraser function through functional icons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display size is increased to provide more functionality, then the display area is improved, but the user convenience deteriorates due to longer distance navigation required to access functional icons
Solution Approach 1:
The patent combines the eraser function with the light pen by integrating an eraser light source into the light pen device. This merging allows the eraser functionality to be accessed wherever the light pen is used, eliminating the need to navigate to a separate eraser icon on the display, thus resolving the contradiction between large display area and user convenience
Solution Approach 2:
The light pen is designed to perform multiple functions: it can both write/draw and erase. By incorporating both writing and erasing capabilities into a single device, the patent enables the light pen to serve universal purposes, allowing users to switch between functions without navigating to different locations on the display
2Device complexity
If the light pen is designed to produce only one single color, then the device simplicity is improved, but the functionality deteriorates as users cannot switch colors or access additional functions
Solution Approach 1:
The patent merges multiple light sources (writing light source and eraser light source) into a single light pen device. This combination allows the device to perform both writing and erasing functions while maintaining relative simplicity, as the multiple light sources are integrated into one unified tool rather than requiring separate devices
3Ease of manufacture
If the eraser function is implemented through a functional icon on the display, then the system uses standard interface elements, but the operation time increases due to the need to navigate to and select the eraser icon
Solution Approach 1:
The patent extracts the eraser function from the display interface and relocates it to the light pen device itself. By taking the eraser functionality out of the software interface and implementing it as a physical function in the writing tool, the system eliminates the time required to navigate to and select eraser icons on the display
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 enhances user convenience by enabling direct image erasure with the image eraser, reducing the need for lengthy navigation and improving operational efficiency.
Implementation Method 1
The light source is disposed on the light entrance surface of the LGP, used for generating a light, wherein the light enters the LGP through the light entrance surface and emit out of the LGP from the light exit surface
Implementation Method 2
The optical film covers the light exit surface of the LGP
Implementation Method 3
portions of the display device in the sensing regions are used for sensing light
Data Source
AI summary
The present disclosure provides an electronic writing system including a holder, a light guide plate, at least one light source, and at least one optical film. The light guide plate is disposed in the holder, and the light guide plate has at least one light entrance surface and a light exit surface. The light source is disposed on the light entrance surface of the light guide plate, and is used for generating a light. The light enters the light guide plate through the light entrance surface, and the light emits out of the light guide plate from the light exit surface. The optical film covers the light exit surface of the light guide plate.