Integrated Sensor Layer for Digitizer-Free Pen Sensing

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Solution Overview

Problem

Existing electronic devices lack efficient methods for sensing inputs from pens, particularly in applications requiring precise touch and proximity inputs, without the need for bulky digitizers that increase thickness and reduce flexibility.

Innovation Solution

An electronic device with a sensor layer and driver configured to operate in touch or pen input modes, utilizing a specific electrode and trace line arrangement with dummy patterns and compensation contact holes, allowing for pen sensing without a digitizer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a digitizer is added to enable pen sensing, then pen input sensing capability is improved, but device thickness increases

Engineering Contradiction:

Improvepen input sensing capabilityVSAvoiddevice thickness

Core Design Contradiction:

Adaptability or versatilityVSLength of stationary object

Solution Approach 1:

The patent merges the pen sensing function with the existing display panel structure by integrating capacitive sensing electrodes directly into the display layer. The sensor layer is combined with the display panel to form an integrated structure that enables both display and pen sensing functions without requiring a separate digitizer layer, thus avoiding increased thickness

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The display panel is designed to serve multiple functions: it acts as both the visual display interface and the sensing surface for pen inputs. The capacitive sensing electrodes are integrated into the display structure, allowing the same component to perform both display and input sensing functions, eliminating the need for additional dedicated sensing layers

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If a digitizer is added to enable pen sensing, then pen input sensing capability is improved, but device flexibility is reduced

Engineering Contradiction:

Improvepen input sensing capabilityVSAvoiddevice flexibility

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent employs thin film structures for the sensor layer and capacitive electrodes, which are inherently flexible and can be integrated into the display panel without adding rigid components. This thin film approach maintains the flexibility and bendability of the device while enabling pen sensing functionality

Inventive Principle:

Principle #30Flexible shells and thin films

3Reliability

If dummy patterns and compensation contact holes are added to the electrode arrangement, then electrode connection reliability is improved, but manufacturing complexity increases

Engineering Contradiction:

Improveelectrode connection reliabilityVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent introduces dummy patterns as intermediary elements between the boundary electrodes and the external circuit. These dummy patterns serve as compensatory structures that maintain electrical connectivity and signal stability at the edges of the electrode array, where edge effects would otherwise degrade performance. The compensation contact holes provide controlled pathways for electrical connection through these dummy regions

Inventive Principle:

Principle #24Intermediary (Mediator)

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

Enables precise pen input sensing without increasing device thickness or reducing flexibility, enhancing user interaction in multimedia devices.

Implementation Method 1

The sensor layer may sense the user's touch or pressure

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS20250251829A1Electronic device

Publication Date: 2025.08.07 SAMSUNG DISPLAY CO LTD

AI summary

An electronic device includes: a sensor layer including: first electrodes; second electrodes; first auxiliary electrodes; second auxiliary electrodes; first trace lines; second trace lines; and dummy patterns. The second trace lines include: second-first trace lines connected to second-first electrodes; and second-second trace lines connected to second-second electrodes. A first boundary electrode from among the second-first electrodes is adjacent to a second boundary electrode from among the second-second electrodes. The dummy patterns include a first boundary dummy pattern, and a second boundary dummy pattern. The first boundary electrode and the first boundary dummy pattern are connected to each other through first compensation contact holes, and the second boundary electrode and the second boundary dummy pattern are connected to each other through second compensation contact holes. A number of the first compensation contact holes and a number of the second compensation contact holes vary depending on positions.