Touch Panel Uplink Signal Synchronization and Error Correction
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Solution Overview
Problem
Current touch panel systems face challenges in increasing the transmission capacity of uplink signals between a touch panel and an active stylus within a limited time, often requiring reduced data amounts or additional communication devices, which increase costs and compromise communication flexibility.
Innovation Solution
A touch panel system that includes a memory, a transmission module, and a touch panel controller, which transmits an uplink signal comprising a preamble for synchronization, digital data for bi-directional communication, and a cyclic redundancy check for error correction, using direct-sequence spread spectrum technology with pseudo noise codes to efficiently transmit data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the contact time of each tap is shortened to reduce uplink signal occupancy time, then the response time is reduced, but the transmission capacity is insufficient
Solution Approach 1:
The patent changes the parameter of uplink signal structure by incorporating a preamble for timing synchronization and using direct-sequence spread spectrum modulation. This allows the signal to be transmitted more efficiently within the limited contact time, increasing transmission capacity without extending occupancy time.
Solution Approach 2:
The patent applies preliminary action by including a timing synchronization preamble at the beginning of the uplink signal. This preamble is transmitted first to establish timing alignment between the active stylus and touch panel, enabling subsequent data transmission to occur efficiently within the remaining contact time.
2Productivity
If additional communication devices such as Bluetooth are added to transmit data, then transmission capacity is increased, but device complexity and cost increase
Solution Approach 1:
The patent makes the touch panel system multi-functional by enabling it to perform both touch sensing and data communication functions through the same hardware interface. The uplink signal transmission mechanism serves dual purposes: maintaining touch panel operation and transmitting data from the active stylus, eliminating the need for separate Bluetooth devices.
Solution Approach 2:
The patent merges the communication function with the existing touch panel uplink signal transmission mechanism. By integrating data transmission capabilities into the standard touch panel communication channel, the system achieves enhanced transmission capacity without adding separate communication devices, thereby reducing device complexity and cost.
3Loss of time
If data amount in uplink signals is reduced to shorten occupancy time, then transmission time is reduced, but communication flexibility is compromised
Solution Approach 1:
The patent employs periodic action through the use of timing synchronization preambles that are transmitted at regular intervals. This periodic synchronization allows the system to maintain accurate timing alignment over multiple transmission cycles, enabling flexible data transmission protocols without compromising the limited contact time constraint.
Data Source
AI summary
A touch input system includes a touch panel, configured to transmit an uplink signal; and an active stylus, configured to analyze the uplink signal, synchronize timing and bi-directionally communicate with the touch panel according to the uplink signal; wherein the uplink signal includes a preamble, for synchronizing the timing; a digital data, for bi-directionally communicating between the active stylus and the touch panel; and a cyclic redundancy check, for executing an error check and an error correction for data.