Integrated Input Sensor Electrode Layout for Thin Display Pen Sensing
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Solution Overview
Problem
The use of separate touch panels and digitizers in display devices increases the thickness of electronic devices, necessitating a technology to reduce thickness while maintaining sensing reliability.
Innovation Solution
An input sensor unit with a specific configuration of sensing electrodes and conductive lines, including peripheral pen sensing electrodes and conductive lines, is integrated into the display panel to enhance sensing reliability and reduce thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate touch panels and digitizers are used, then sensing reliability for both touch and pen inputs is improved, but device thickness increases
Solution Approach 1:
The patent combines touch sensing electrodes and pen sensing electrodes into a single integrated input sensor unit. The touch sensing electrodes detect finger touches while pen sensing electrodes detect stylus inputs, merging two separate sensing functions into one unified structure that maintains sensing reliability for both input types while reducing overall device thickness.
Solution Approach 2:
The input sensor unit is designed with multi-functional capability to handle both touch inputs and pen inputs through a single sensing structure. The sensing electrodes are configured to respond to different input types (finger touch and stylus) using the same electromagnetic resonance mechanism, making the sensor unit universal for multiple input methods without requiring separate dedicated sensors for each function.
2Adaptability or versatility
If separate touch panels and digitizers are used, then input sensing functionality is improved, but device complexity increases
Solution Approach 1:
The patent merges touch sensing and pen sensing functionalities into a single integrated input sensor unit with unified electrode structures. This consolidation maintains the versatility to detect both finger touches and stylus inputs while reducing the number of separate components, connection interfaces, and control circuits needed, thereby simplifying the overall device architecture.
3Length of stationary object
If a single input sensor unit is used, then device thickness is reduced, but sensing reliability may deteriorate
Solution Approach 1:
Within the integrated input sensor unit, the patent segments the sensing electrodes into distinct touch sensing electrodes and pen sensing electrodes with different geometric configurations. The pen sensing electrodes are specifically designed with patterns optimized for detecting stylus inputs, while touch sensing electrodes are optimized for finger touches. This segmentation within integration ensures that each input type is detected with high reliability despite the unified structure.
Solution Approach 2:
The patent applies local quality optimization by designing different electrode patterns and configurations in different regions of the sensor unit. Pen sensing electrodes use specific patterns (such as interdigitated or mesh patterns) optimized for electromagnetic resonance detection of stylus, while touch sensing electrodes use patterns optimized for capacitive touch detection. This localized optimization of electrode characteristics ensures high sensing reliability for each input type within the integrated structure.
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 sensor unit improves sensing reliability and reduces the overall thickness of display devices by optimizing the layout of sensing electrodes and conductive lines.
Implementation Method 1
the pen is driven by an AC signal to cause an oscillating magnetic field, and the oscillating magnetic field induces a signal to the coils. The position of the pen is detected through the signal of the coils.
Implementation Method 2
The digitizer recognizes the position of the pen by sensing an electromagnetic change caused by access of the pen
Data Source
AI summary
Disclosed is a display device which includes a display panel and an input sensor unit. The input sensor unit includes a base layer, a plurality of sensing electrodes, a plurality of lines, and a peripheral pen sensing electrode. The plurality of sensing electrodes include a first sensing electrode, a second sensing electrode, a pen sensing electrode 1-1, a pen sensing electrode 1-2, and a second pen sensing electrode. A first width of the peripheral pen sensing electrode in a first direction is greater than a second width of each of the plurality of lines in the first direction.