Integrated Input Sensing Electrode Layout for Thin Display Panels
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Solution Overview
Problem
The separate use of touch panels and digitizers in display devices increases the thickness of electronic devices, necessitating a technology to reduce device thickness while maintaining input sensing reliability.
Innovation Solution
An input sensing part with a base layer containing first and second sensing electrodes, first and second pen sensing electrodes, a pen sensing line, and an additional electrode insulated from the pen sensing line, along with a guard line and insulating layers, is integrated into a display device to enhance sensing reliability and reduce thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch panel and digitizer are used separately, then input sensing functionality is complete, but device thickness increases
Solution Approach 1:
The patent combines touch panel and digitizer functionalities into a single integrated input sensing part. The sensing electrodes serve dual purposes: detecting finger touches (touch panel function) and detecting pen inputs (digitizer function). This merging eliminates the need for separate components, reducing device thickness while maintaining complete input sensing functionality.
Solution Approach 2:
The sensing electrodes in the integrated input sensing part perform multiple functions simultaneously. The same electrode structure detects both capacitive touches from fingers and electromagnetic signals from pens, making the component universal and eliminating the need for separate specialized components for each input type.
2Reliability
If multiple electrodes are arranged in the active area, then sensing reliability is improved, but device complexity increases
Solution Approach 1:
The input sensing part is segmented into distinct electrode types with specific functions: sensing electrodes for touch detection, pen sensing electrodes for pen input detection, additional electrodes for signal enhancement, and guard lines for noise reduction. Each segment serves a specialized purpose, improving overall sensing reliability while maintaining manageable complexity through functional organization.
Solution Approach 2:
Different electrodes are strategically positioned in specific locations within the active area and peripheral area to optimize their respective functions. Sensing electrodes are arranged for touch detection, pen sensing electrodes for pen input, guard lines surround the active area for noise reduction. This localized optimization improves sensing reliability without requiring uniform complexity across the entire device.
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
The integrated input sensing part improves sensing reliability and reduces the overall thickness of display devices by optimizing the arrangement and insulation of electrodes, thereby enhancing user input detection capabilities.
Implementation Method 1
an additional electrode insulated from the pen sensing line and overlapping at least a portion of the pen sensing line in a plan view
Implementation Method 2
an insulating layer arranged between the at least a portion of the pen sensing line and the additional electrode
Data Source
AI summary
An input sensing part includes a base layer including an active area and a peripheral area disposed adjacent to the active area, first sensing electrodes arranged in the active area and extending in a first direction, second sensing electrodes arranged in the active area and extending in a second direction intersecting with the first direction, first pen sensing electrodes arranged in the active area, extending in the first direction, and insulated from the first sensing electrodes, second pen sensing electrodes arranged in the active area, extending in the second direction, and insulated from the second sensing electrodes, a pen sensing line connected to the first pen sensing electrodes, and an additional electrode insulated from the pen sensing line and overlapping at least a portion of the pen sensing line in a plan view.