Electronic Chalkboard Panel Identification via Unique Reference Signals
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Solution Overview
Problem
Existing electronic chalkboard systems face challenges in accurately determining which display panel is touched by a pointing device, especially when multiple panels are used to form a large screen, as they lack a reliable method to differentiate between panels and accurately calculate coordinate information for image display.
Innovation Solution
The system employs a pointing device that calculates coordinate information based on a reference signal generated on the display panels, which includes a sensor to detect the signal and a controller to determine the touched panel, and an image processor that generates distinct signal patterns, time intervals, and pulse numbers for each panel to identify the correct panel for image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple display panels are used to form a large screen, then the display area is increased, but the ability to accurately determine which panel is touched by a pointing device deteriorates
Solution Approach 1:
The system divides the large display area into multiple independent display panels, each capable of generating and responding to reference signals independently. This segmentation allows the pointing device to identify which specific panel is touched by detecting the reference signal from that panel, thereby maintaining measurement precision across the entire large display area.
Solution Approach 2:
Each display panel is assigned unique characteristics in its reference signal (different waveforms, time intervals, pulse numbers, or voltage levels). This local differentiation enables the pointing device to not only detect which panel is touched but also to precisely identify the specific panel among multiple panels, resolving the contradiction between large display area and accurate panel identification.
2Measurement precision
If reference signals with different characteristics are generated for each display panel, then panel identification accuracy is improved, but the system complexity increases
Solution Approach 1:
The image processor performs multiple functions: it generates reference signals with unique characteristics for each panel, scans the display panels, processes touch coordinate information, and controls image display. By making the image processor multi-functional, the system achieves high panel identification accuracy without adding separate dedicated hardware for each function, thereby managing system complexity effectively.
Solution Approach 2:
The system differentiates between display panels by varying parameters of the reference signals (waveform shape, time interval between pulses, number of pulses, voltage level duration). These parameter changes provide unique identifiers for each panel without requiring fundamentally different signal generation mechanisms, thus improving panel identification accuracy while keeping the overall system architecture relatively simple.
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 enables precise determination of the touched panel and accurate image display on the electronic chalkboard system, enhancing user interaction and image processing capabilities by distinguishing between multiple display panels through unique signal characteristics.
Implementation Method 1
The reference signal may include an infrared signal
Data Source
AI summary
An electronic chalkboard system, a control method thereof, and a pointing device are provided. The electronic chalkboard system includes a plurality of display panels; a pointing device which calculates coordinate information about a touched position based on a reference signal generated on the display panels when touching a first panel among the display panels; and an image processor which generates a signal differently set with respect to each of the display panels on the display panels to determine the first panel among the display panels and displays an image corresponding to the coordinate information calculated by the pointing device on the first panel.