Touch Driver Signal Run Length Differentiation for Active Pen Positioning
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Solution Overview
Problem
Conventional technologies face challenges in accurately obtaining touch position information above a display using tools like active pens, as existing methods struggle to provide precise location and coordinate data.
Innovation Solution
A display device equipped with a touch array and a touch driver that generates distinct uplink and beacon signals to communicate with external devices, allowing for the transmission and reception of position information, including active pen status, through a touch array, using electrical pulses and synchronized communication protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional positioning technologies (satellite signals, indoor positioning) are used to obtain touch position information above the display, then location data can be obtained, but the precision and accuracy of touch position information is insufficient
Solution Approach 1:
The patent introduces an electrical field as an intermediary medium between the display and the external device (active pen). The touch driver generates electrical signals that create an electrical field, and the external device's position is detected by measuring capacitance changes in this field. This intermediary electrical field enables precise position detection above the display surface without requiring direct contact or relying on imprecise satellite/indoor positioning technologies.
Solution Approach 2:
The patent replaces conventional mechanical or radio-based positioning systems with an electrical field-based detection system. Instead of using satellite signals or indoor positioning technologies that rely on mechanical movements or radio wave propagation, the system uses electrical signals applied to touch electrodes to create an electrical field for detecting the position of external devices with higher precision.
2Device complexity
If the touch driver generates both uplink signals and beacon signals with the same run length, then signal transmission is simplified, but the external device cannot accurately distinguish between signal types
Solution Approach 1:
The patent applies different run length characteristics to different signal types (uplink signals vs. beacon signals). Ulink signals have a maximum run length of N, while beacon signals have a run length of N+1 or more. This local differentiation in signal properties allows the external device to easily distinguish between signal types based on run length analysis, while maintaining relatively simple transmission protocols.
Solution Approach 2:
The patent changes the run length parameter of electrical signals to encode different information types. By varying the run length (number of consecutive identical signal levels) of electrical pulses, the system can distinguish between uplink signals (maximum run length N) and beacon signals (run length N+1 or more), enabling efficient signal type identification without complex modulation schemes.
3Loss of information
If the system uses detailed signal protocols to communicate position and status information, then communication accuracy improves, but the communication complexity increases
Solution Approach 1:
The patent uses parameter changes in electrical signal run lengths to efficiently encode multiple types of information. By varying the run length of electrical pulses, the system can convey signal type identification, position information, and status data without requiring complex communication protocols. The external device analyzes run length patterns to extract all necessary information, simplifying the overall communication architecture.
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
Enables efficient and accurate determination of the position and status of external devices, such as active pens, above the display, enhancing the precision and functionality of touch-based interactions.
Implementation Method 1
the touch driver may generate uplink signals and beacon signals through at least some of the touch electrodes in a first time period, transmit generated uplink signals and beacon signals to an external device
Implementation Method 2
a touch array including a plurality of touch electrodes; and a touch driver sensing a touch approaching the touch array
Data Source
AI summary
A display device includes: a touch array including a plurality of touch electrodes; and a touch driver configured to sense a touch approaching the touch array, wherein the touch driver is configured to generate uplink signals and beacon signals through at least some of the touch electrodes in a first time period, to transmit generated uplink signals and beacon signals to an external device, and to receive position information of the external device above the touch array, which is calculated by the external device, from the external device using the uplink signals in a second time period after the first time period, and wherein a range of the run length of the uplink signals and a range of the run length of the beacon signals are distinct from each other.