Stylus Pen Input Latency via Local Trajectory Superposition
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Solution Overview
Problem
Existing stylus pen input methods suffer from high line-drawing latency, which affects the writing immediateness and user experience when using stylus pens on touchscreen devices.
Innovation Solution
A stylus pen input method that involves a first electronic device receiving a projection interface from a second electronic device and processing local inputs to generate a second handwriting trajectory, which is superimposed on the projection image from the second electronic device, reducing latency and improving immediateness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the projection image is generated and transmitted from the second electronic device to the first electronic device, then the projection interface can be displayed on the first electronic device, but the line-drawing latency increases due to transmission and processing time
Solution Approach 1:
The patent segments the handwriting trajectory generation process into two parts: the first handwriting trajectory is generated by the second electronic device and transmitted to the first electronic device, while the second handwriting trajectory is generated locally by the first electronic device. This segmentation allows the first electronic device to display handwriting trajectories without waiting for the complete projection image from the second device, thereby reducing line-drawing latency while maintaining projection interface functionality.
2Loss of time
If the handwriting trajectory is drawn locally by the first electronic device, then the line-drawing latency is reduced, but the consistency with the projection image from the second electronic device may be compromised
Solution Approach 1:
The patent uses the first electronic device as an intermediary that receives both the projection image and handwriting trajectory information from the second electronic device, then generates local handwriting trajectories based on this information. The first device acts as a mediator between the second device's projection output and the display requirement, synthesizing handwriting trajectories locally while maintaining consistency with the projected content, thus reducing latency without compromising consistency.
Data Source
AI summary
A first electronic device receives a projection interface of a first application from a second electronic device, and displays the projection interface. The first electronic device receives a first input and a second input that are in the projection interface and that are of a stylus pen used by a user, and displays an updated projection interface. The updated projection interface includes a first layer and a second layer. The first layer includes a first image that includes a first handwriting trajectory and that is generated by the second electronic device based on the first input; and the second layer includes a second handwriting trajectory that is locally drawn by the first electronic device based on the second input.