Active Pen Sensing Layout With Localized Line Activation
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Solution Overview
Problem
Existing display devices with active pen sensing technology face challenges in high power consumption due to the continuous activation of all sensing lines, even when the active pen's location is confirmed, and the need for reduced sensing time to meet higher resolution and frequency requirements.
Innovation Solution
The implementation of a sensing device with division blocks arranged in a matrix, where sensing lines are activated only in specific areas around the active pen's location, including first and second sensing lines to detect presence, coordinates, and perform local sensing, reducing unnecessary line activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all sensing lines are continuously activated to recognize active pen touch or proximity, then sensing reliability is improved, but power consumption increases
Solution Approach 1:
The sensing device is divided into multiple division blocks, each independently controllable. When an active pen is detected in a specific division block, only that block and its neighboring blocks maintain active sensing lines, while other blocks reduce or stop activation. This segmentation allows the system to maintain sensing reliability in the relevant area while reducing overall power consumption across the entire panel.
Solution Approach 2:
The sensing system transitions from uniform activation across the entire panel to localized activation based on detected pen position. The quality of sensing (line activation state) varies by location: high activation in and around the detected pen area, low or zero activation in other areas. This local quality approach maintains reliability where needed while eliminating unnecessary power consumption in inactive regions.
2Reliability
If all sensing lines are activated across the entire panel, then sensing coverage is improved, but sensing time increases
Solution Approach 1:
By segmenting the panel into division blocks and activating only the relevant segment (where the pen is detected) plus neighboring blocks, the system processes a smaller subset of sensing lines. This reduces the total sensing time while maintaining adequate coverage through the neighboring block extension, which accounts for potential pen movement or proximity detection needs.
Solution Approach 2:
The system performs preliminary detection using a reduced set of sensing lines to identify the active pen's approximate location. Once detected, it activates neighboring division blocks in advance of potential pen movement, ensuring continuous tracking without requiring full-panel activation at all times. This preliminary action approach reduces sensing time while maintaining coverage.
3Productivity
If the section for active pen sensing is reduced to meet high-resolution panel requirements, then productivity is improved, but sensing precision deteriorates
Solution Approach 1:
The system concentrates sensing resources (activated lines) locally in and around the detected pen position rather than distributing them uniformly across the entire panel. This local quality enhancement maintains high sensing precision in the relevant area while allowing the overall sensing section to be reduced for high-resolution panel requirements, thus improving productivity without sacrificing precision where it matters.
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 approach significantly reduces power consumption and shortens sensing time by focusing on localized sensing, allowing for precise and accurate detection of active pen coordinates while meeting high-resolution display demands.
Implementation Method 1
The stylus pen has an advantage of allowing more detailed input than fingers. The stylus pen is divided into a passive type stylus pen (hereinafter referred to as passive pen) and an active type stylus pen (hereinafter referred to as active pen). The passive pen has a disadvantage of making it difficult to detect the touch location because there is little change in capacitance at the contact point with the panel. On the other hand, since the active pen outputs its own driving signal to the contact point with the panel, it has the advantage of being easier to detect the touch location than the passive pen
Data Source
AI summary
An active pen sensing device, a display device comprising same and a sensing driving method are provided; and the active pen sensing device can include a plurality of division blocks divided into a matrix along a first direction and a second direction intersecting the first direction, each of which comprises a plurality of sensing cells, a plurality of first sensing lines connected to the plurality of sensing cells of each of the plurality of division blocks along the first direction, a plurality of second sensing lines connected to the plurality of sensing cells of each of the plurality of division blocks along the second direction, and a sensing driving device connected to the plurality of first sensing lines and the plurality of second sensing lines to drive the plurality of division blocks.