Tablet Pen Stroke Overlay for Low-Latency Display
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Solution Overview
Problem
Existing computers, such as tablet terminals, experience delays in displaying stroke images due to processing delays, necessitating the inclusion of an overlay engine in the timing controller, which is undesirable.
Innovation Solution
A computer system generates a temporary stroke image in parallel with the host processor and superimposes it on the video signal before it reaches the timing controller, eliminating the need for an overlay engine in the timing controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an overlay engine is provided in the timing controller to prevent delay in displaying stroke images, then the display speed is improved, but the device complexity increases
Solution Approach 1:
The patent divides the overlay engine functionality into two separate components: a temporary stroke image generation processor that generates temporary stroke images from coordinate data, and a scaler that superimposes these images onto video signals. This segmentation eliminates the need for a complex overlay engine in the timing controller while maintaining fast display performance.
Solution Approach 2:
The temporary stroke image generation processor performs preliminary generation of temporary stroke images from coordinate data before the video signal processing. This preliminary action allows the stroke images to be ready for immediate superimposition by the scaler, preventing display delays without requiring complex timing controller modifications.
2Loss of time
If coordinate data is directly transmitted from sensor controller to overlay engine for real-time processing, then the response time is improved, but the device complexity increases
Solution Approach 1:
The patent segments the real-time processing path into two parts: coordinate data is directly transmitted to the temporary stroke image generation processor for immediate temporary stroke image generation, and then to the scaler for superimposition. This segmentation achieves real-time response without requiring a complex overlay engine in the timing controller.
Solution Approach 2:
The temporary stroke image generation processor acts as an intermediary between the sensor controller and the scaler, receiving coordinate data directly and generating temporary stroke images that are then superimposed by the scaler. This intermediary approach enables real-time processing while keeping the timing controller simple.
Data Source
AI summary
Provided is a computer including a host processor which, in operation, generates a stroke image representing a stroke indicated by a series of coordinate data indicating a plurality of positions of a pen on a touch surface and generates a video signal representing the stroke image, a timing controller which, in operation, controls, based on the video signal, a potential of each of a plurality of gate lines provided in a display, and a temporary stroke image generation processor which in operation, generates, in parallel with the host processor, a temporary stroke image representing a same stroke as the stroke of the stroke image, in which the temporary stroke image is superimposed on the video signal before the video signal is supplied to the timing controller.