Touch Driver Uplink Signals for Pen Position Tracking
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Solution Overview
Problem
Existing display devices face challenges in accurately acquiring position information of external devices, such as active pens, above a touch panel, as current methods struggle to provide precise touch position data.
Innovation Solution
A display device with a touch array and a touch driver that transmits uplink signals with position information through touch electrodes and receives downlink signals from external devices, allowing the external devices to calculate their position using these signals, enabling efficient and accurate position tracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional touch panel methods are used to acquire position information, then the system is simple to implement, but the position accuracy of external devices above the display is insufficient
Solution Approach 1:
The patent introduces uplink signals as an intermediary carrier to transmit position information from the touch panel to the external device. These signals serve as a mediator that enables accurate position acquisition without requiring complex direct measurement systems between the touch panel and external device, thus improving measurement precision while managing system complexity.
Solution Approach 2:
The patent replaces traditional mechanical or direct electrical contact-based position detection with an electromagnetic signal-based system. By using uplink signals transmitted through touch electrodes, the system substitutes physical measurement mechanisms with electromagnetic field-based communication, enabling non-contact position information transfer with higher accuracy.
2Loss of information
If uplink signals with position information are transmitted through touch electrodes, then position information of external devices can be accurately acquired, but the transmission process becomes more complex
Solution Approach 1:
The patent makes the touch electrodes serve multiple functions: they act as both the touch sensing elements and the transmission channels for uplink signals. This multi-functionality allows position information to be transmitted through the existing touch electrode structure without adding separate transmission components, thereby reducing overall system complexity while maintaining accurate position information transfer.
Solution Approach 2:
The patent merges the touch sensing function and the signal transmission function into a single integrated system. The uplink signal transmission is combined with the touch electrode structure, so that the same physical components perform both touch detection and information transmission, simplifying the transmission process despite the enhanced functionality.
3Reliability
If the touch driver transmits uplink signals in a first time period and receives downlink signals in a second time period, then position information can be effectively acquired, but the communication protocol becomes more complex
Solution Approach 1:
The patent implements periodic communication cycles with distinct time periods: a first time period for uplink signal transmission and a second time period for downlink signal reception. This periodic structure organizes the bidirectional communication into regular, predictable intervals, improving reliability by ensuring dedicated time slots for each communication direction while managing protocol complexity through temporal segmentation.
Solution Approach 2:
The patent segments the communication process into distinct time periods and signal directions. The communication protocol is divided into separate uplink and downlink phases, with each phase having specific timing and functional requirements. This segmentation improves reliability by preventing signal interference and ensuring proper timing, while the structured division makes the protocol more manageable despite its enhanced functionality.
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 effectively acquires and tracks the position of external devices above the display, enhancing the accuracy and efficiency of touch input recognition, particularly for tools like active pens.
Implementation Method 1
one or more capacitors generated between at least some of the touch electrodes and the external device when the external device is adjacent to the touch array
Implementation Method 2
a position sensor configured to calculate the position information of the external device on the touch array, using the uplink signals
Data Source
AI summary
A display device including: a touch array including a plurality of touch electrodes; and a touch driver configured to sense a touch adjacent to the touch array, wherein the touch driver transmits, to an external device, uplink signals in which different position information are included through at least some of the touch electrodes in a first time period, and receives, from the external device, position information of the external device on the touch array in a second time period after the first time period, and wherein the position information of the external device is calculated by the external device, using the uplink signals.