Active Pen Signal Encoding via Duty Ratio Modulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices face challenges in efficiently providing both finger touch and pen touch functions while accurately recognizing pen information, as existing technologies struggle to rapidly transmit a large amount of pen information within a limited time, leading to delayed or incomplete recognition of pen inputs.
Innovation Solution
The implementation of an active pen system that uses a touch display device with a touchscreen panel and a touch circuit, which employs various signal timing strategies, such as duty ratio and amplitude variable control, to rapidly transmit pen information by utilizing multiple states and symbol values, allowing for increased data transmission within a predetermined limited time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a large amount of pen information is transmitted, then the completeness of pen information recognition is improved, but the transmission time increases
Solution Approach 1:
The patent applies periodic action by using pulse signals with different duty ratios to transmit pen information. The duty ratio of the pulse signal is varied periodically to encode different types of pen information (e.g., button press, eraser mode, tilt angle), allowing multiple information states to be transmitted through periodic variations in a single signal waveform without requiring separate transmission channels or extended time periods.
Solution Approach 2:
The patent employs parameter changes by modifying the duty ratio parameter of the pulse signal to encode different pen information states. By changing the duty ratio (the ratio of pulse width to period), the system can represent multiple information types within the same time frame, thus transmitting more information without increasing transmission time. This parameter modulation allows efficient encoding of complex pen states.
2Adaptability or versatility
If multiple pen functions are provided, then the versatility of the touch display device is improved, but the complexity of signal transmission increases
Solution Approach 1:
The patent implements universality by designing a single pulse signal transmission channel that can carry multiple types of pen information through duty ratio modulation. The same signal line and communication protocol are used for various pen functions (button press, eraser, tilt sensing, pressure detection), eliminating the need for separate dedicated channels for each function and reducing overall system complexity despite supporting multiple pen capabilities.
Solution Approach 2:
The patent uses parameter changes (duty ratio variation) as a universal encoding mechanism for different pen functions. By systematically varying the duty ratio parameter, the system can distinguish between different pen states and functions using the same transmission infrastructure, thereby managing complexity through a unified parameter-based approach rather than requiring separate complex signaling schemes for each function.
3Productivity
If pen information is transmitted rapidly, then the recognition speed is improved, but the accuracy of information detection may deteriorate
Solution Approach 1:
The patent incorporates feedback mechanisms where the touch display device sends beacon signals to the active pen, and the pen responds with pulse signals containing its information. This bidirectional feedback loop allows for verification and error correction, ensuring that even rapid transmissions are accurately received and interpreted. The feedback system enables real-time adjustment and confirmation of transmitted data, maintaining accuracy despite high transmission speeds.
Solution Approach 2:
The patent uses periodic pulse signals with defined duty ratios to encode pen information, creating regular, predictable transmission patterns. This periodic structure facilitates synchronized reception and analysis by the touch display device, allowing rapid yet accurate detection by establishing clear temporal patterns that are easy to track and interpret even at high transmission rates.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A touch display device (10) may include: a panel (110) including a plurality of touch electrodes (TE), and a touch circuit (300) configured to: transfer a panel driving signal (PDS1, PDS2, PDS3) to the panel (110), and receive a pen information signal (PINFO), output from a pen (20) in response to the panel driving signal (PDS1, PDS2, PDS3), through the panel (110), each of the panel driving signal (PDS1, PDS2, PDS3) and the pen information signal (PINFO) including a plurality of pulses, the pen information signal (PINFO) including one or more state sections among: an in-phase state section including pulses in phase with the pulses of the panel driving signal (PDS1, PDS2, PDS3), an antiphase state section including pulses having a different phase from the pulses of the panel driving signal (PDS1, PDS2, PDS3), and a passive state section distinguished from the in-phase state section and the antiphase state section.