In-Vehicle Display Touch Delay Mechanism
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Solution Overview
Problem
In-vehicle devices experience malfunctions during continuous touch operations due to acceleration operations, which can result in incorrect cursor positioning and failure to determine touch operations correctly, especially when using HID packets for mouse-like operations.
Innovation Solution
Implementing a system where the in-vehicle device delays transmission of operation information for subsequent touch operations by a predetermined interval time, limiting the number of delayed transmissions, and setting optimal interval times based on policy files from a server, to prevent acceleration processing and ensure accurate touch operation recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If operation information representing displacement quantities is continuously input within a predetermined time, then the cursor can move to a desired position with a relatively small amount of operation through acceleration processing, but the portable terminal cannot accurately determine touch operations and malfunctions occur
Solution Approach 1:
The in-vehicle device applies preliminary anti-action by detecting continuous touch operations and actively suppressing the generation of operation information that would trigger acceleration processing. The control unit determines whether touch operations are continuous based on timing intervals and prevents the transmission of displacement quantity information that would cause the portable terminal to incorrectly interpret the operations as acceleration movements, thereby counteracting the potential malfunction before it occurs.
2Measurement precision
If operation information is transmitted for every touch operation, then accurate touch operation recognition is achieved, but the number of data transmissions increases and power consumption rises
Solution Approach 1:
The system applies partial action by selectively transmitting operation information only when necessary. The control unit transmits operation information for individual touch operations unless they are determined to be continuous operations that would trigger acceleration processing. This partial transmission approach maintains accurate touch operation recognition for valid operations while reducing the overall number of data transmissions and associated power consumption.
3Productivity
If the in-vehicle device transmits operation information continuously, then the portable terminal can respond to all user inputs, but acceleration processing is triggered causing incorrect cursor positioning
Solution Approach 1:
The system implements feedback by continuously monitoring the timing intervals between successive touch operations and using this information to control the transmission of operation information. The control unit measures the time elapsed since the previous touch operation and uses this feedback to determine whether to transmit operation information, thereby preventing the triggering of acceleration processing while maintaining responsive cursor movement for valid operations.
Data Source
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AI summary
A display device configured to be connected to an information terminal, includes: a video reception unit that receives video information about a screen including a cursor from the information terminal; a touch panel that brings up the screen on display based on the video information received by the video reception unit and detects a touch position specified by a touch operation; and a transmission unit that transmits operation information in correspondence to the touch operation to the information terminal. The transmission unit transmits the operation information in a delay when the touch operation is performed continuously.