Integrated Pen Sensing Electrode Layout for Thin Touch Displays
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Solution Overview
Problem
Multimedia devices with separate touch panels and digitizers for sensing user and pen touches increase device thickness.
Innovation Solution
An input sensing unit with overlapping and interconnected pen sensing electrodes on different layers, enhancing sensitivity for both touch and pen inputs while reducing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate touch panel and digitizer are disposed in the display device, then sensing capability for touch and pen is improved, but device thickness is increased
Solution Approach 1:
The patent combines the touch panel and digitizer into a single integrated sensing unit that performs both touch sensing and pen sensing functions. The sensing unit includes multiple sensing electrodes (first sensing electrode, second sensing electrode, first pen sensing electrode, and second pen sensing electrode) that work together to detect both touch inputs and pen inputs, eliminating the need for separate devices and thereby reducing overall device thickness.
Solution Approach 2:
The patent utilizes multiple layers to arrange sensing electrodes in three-dimensional space. The first and second sensing electrodes are disposed on different layers, as are the first and second pen sensing electrodes. This multi-layer configuration allows the integrated sensing unit to provide enhanced sensing capability in a compact vertical structure, effectively using the vertical dimension to accommodate multiple sensing functions without increasing horizontal footprint or overall thickness.
2Length of stationary object
If multiple sensing electrodes are integrated in a single unit, then device thickness is reduced, but sensing sensitivity may be compromised
Solution Approach 1:
The integrated sensing unit is segmented into distinct functional components: a first sensing electrode for touch sensing, a second sensing electrode for additional touch sensing, a first pen sensing electrode for pen input detection, and a second pen sensing electrode for pen input detection. Each electrode is optimized for its specific sensing function, with the pen sensing electrodes having higher capacitance values to ensure sensitive detection of pen inputs. This segmentation allows each component to maintain high sensing sensitivity while working together in an integrated structure.
Solution Approach 2:
Different regions of the sensing unit have different properties optimized for their specific functions. The pen sensing electrodes are designed with higher capacitance values compared to the touch sensing electrodes, creating local quality differences that enhance pen input detection sensitivity. The electrodes are also arranged with specific spacing and orientation to optimize their sensing characteristics for their respective functions, ensuring that each area of the sensing unit performs optimally.
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
Improves sensitivity for both touch and pen inputs while minimizing device thickness by integrating sensing functions within a single unit.
Implementation Method 1
a first pen sensing electrode that extends in the first direction and includes a pen sensing electrode 1-1 and a pen sensing electrode 1-2 that are disposed on different layers and that overlap each other, and a second pen sensing electrode that extends in the second direction and includes a pen sensing electrode 2-1 and a pen sensing electrode 2-2 that are disposed on different layers and that overlap each other
Data Source
AI summary
Disclosed are an input sensing unit and a display device including the input sensing unit. The input sensing unit includes a first sensing electrode extending in a first direction, a second sensing electrode extending in a second direction and insulated from the first sensing electrode, a first pen sensing electrode extending in the first direction and including a 1-1st pen sensing electrodes and a 1-2nd pen sensing electrode disposed on different layers and overlapping each other, and a second pen sensing electrode extending in the second direction and including a 2-1st pen sensing electrodes and a 2-2nd pen sensing electrode disposed on different layers and overlapping each other. The 1-1st pen sensing electrode is disposed adjacent to the first sensing electrode on the same layer, and the 2-1st pen sensing electrode is disposed adjacent to the second sensing electrode on the same layer.