Liquid Crystal Handwriting Board With Electromagnetic Touch Layer
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Solution Overview
Problem
Existing liquid crystal handwriting boards with infrared positioning systems have increased thickness and reduced screen-to-body ratio due to the integration of infrared positioning apparatuses, which affect their usability and aesthetics.
Innovation Solution
The integration of an electromagnetic touch layer with series-connected signal lines forming a coil structure in the liquid crystal handwriting board, allowing for position detection using electromagnetic signals, eliminating the need for infrared positioning apparatuses and reducing board thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If infrared positioning apparatuses are integrated into the liquid crystal handwriting board, then position detection function is improved, but the thickness of the board increases and screen-to-body ratio decreases
Solution Approach 1:
The patent combines the electromagnetic touch layer with the liquid crystal display layer into a single integrated structure. The electromagnetic signal lines are embedded within the touch layer that is directly coupled to the liquid crystal panel, eliminating the need for separate infrared positioning apparatuses and reducing overall board thickness while maintaining position detection functionality.
Solution Approach 2:
The patent replaces the mechanical/optical infrared positioning system with an electromagnetic field-based touch detection system. By using electromagnetic signal lines embedded in the touch layer, the system achieves position detection through electromagnetic induction rather than infrared optical paths, thereby reducing structural complexity and thickness.
2Measurement precision
If infrared positioning apparatuses are integrated into the liquid crystal handwriting board, then position detection function is improved, but the screen-to-body ratio decreases
Solution Approach 1:
The electromagnetic touch layer is merged with the liquid crystal display layer, allowing the touch detection functionality to be achieved within the same structural footprint as the display. This integration eliminates the need for additional peripheral components that would reduce the screen-to-body ratio.
Solution Approach 2:
The electromagnetic signal lines serve multiple functions: they act as both the display circuitry for the liquid crystal panel and the sensing elements for position detection. This multi-functionality eliminates the need for separate dedicated positioning apparatuses, maximizing the screen-to-body ratio.
3Adaptability or versatility
If electromagnetic signal lines are connected in series to form coil structures, then local erasing and saving functions are enabled, but the circuit complexity increases
Solution Approach 1:
The electromagnetic signal lines are divided into multiple segments or groups that can be independently controlled. By connecting adjacent signal lines in series to form coil structures only in specific regions, the system enables localized erasing and saving functions while maintaining manageable circuit complexity through modular segmentation.
Solution Approach 2:
The circuit configuration is made dynamic by selectively connecting adjacent electromagnetic signal lines in series based on detected touch positions. The connection structures allow the circuit topology to change dynamically, forming coil structures only where needed for local erasing or saving operations, rather than maintaining a fixed complex circuit throughout.
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 enables effective local erasing and saving of handwriting while reducing the overall thickness and improving the screen-to-body ratio of the liquid crystal handwriting board by utilizing electromagnetic touch technology.
Implementation Method 1
an electromagnetic touch layer with series-connected signal lines forming a coil structure in the liquid crystal handwriting board, allowing for position detection using electromagnetic signals
Implementation Method 2
a liquid crystal layer disposed between the first base plate and the second base plate, wherein the liquid crystal layer includes bistable liquid crystal molecules
Data Source
AI summary
Provided is a liquid crystal handwriting board. The liquid crystal handwriting board includes: a first base plate and a second base plate that are oppositely disposed, and a liquid crystal layer disposed between the first base plate and the second base plate, wherein the liquid crystal layer includes bistable liquid crystal molecules; the first base plate includes: a first substrate, and an electromagnetic touch layer and a pixel electrode layer that are disposed on a side of the first substrate, wherein the electromagnetic touch layer is provided with a plurality of electromagnetic signal lines, each two adjacent electromagnetic signal lines being connected in series; and the second base plate includes: a second substrate, and a common electrode layer that is disposed on a side of the second substrate.