Display Device Shielding Electrode Circuit Interference

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing display devices with biometric information recognition functions face challenges in achieving improved recognition performance due to limitations in circuit design and electrode arrangements.

Innovation Solution

A display device with a base layer, a circuit layer, and an element layer, featuring light emitting elements and light receiving elements, where the circuit layer includes pixel driving circuits, sensor driving circuits, and read-out wirings, and a shielding electrode is used to overlap the read-out wirings and sensor driving circuits, enhancing recognition performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the pixel connection electrode crosses the read-out wirings in a plan view to connect the pixel driving circuit to the light emitting element, then the circuit connection is simplified, but electromagnetic interference occurs between the pixel connection electrode and the read-out wirings, degrading biometric information recognition performance

Engineering Contradiction:

Improvecircuit connection structureVSAvoidbiometric information recognition performance

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The pixel connection electrode is designed to be in a different layer than the read-out wirings, transitioning from a planar 2D crossing arrangement to a 3D spatial separation. This vertical stacking in different layers eliminates the electromagnetic interference that would occur if the electrode crossed the wirings in the same plane, while still achieving proper circuit connection through controlled impedance pathways.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If the pixel connection electrode does not cross the read-out wirings in a plan view, then electromagnetic interference is reduced, but the circuit routing becomes more complex requiring additional structures

Engineering Contradiction:

Improvebiometric information recognition performanceVSAvoidcircuit routing structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

A via hole structure serves as an intermediary element to bridge the pixel connection electrode to the light emitting element without requiring the electrode to cross over the read-out wirings in the same layer. The via hole provides a controlled impedance pathway that enables electrical connection while maintaining spatial separation from the read-out wirings, thus reducing interference without compromising connectivity.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of manufacture

If the circuit layer structure is simplified without shielding electrodes, then manufacturing is easier, but electromagnetic interference from read-out wirings affects sensor driving circuits, reducing recognition accuracy

Engineering Contradiction:

Improvecircuit layer fabricationVSAvoidsensor signal accuracy

Core Design Contradiction:

Ease of manufactureVSMeasurement precision

Solution Approach 1:

A shielding electrode is introduced as an intermediary protective structure between the read-out wirings and the sensor driving circuits. This shielding electrode acts as a electromagnetic barrier that blocks interference from the read-out wirings from reaching the sensor circuits, thereby improving signal accuracy while adding only minimal structural complexity to the circuit layer.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The shielding electrode utilizes the existing read-out wiring structure by positioning the shielding electrode to overlap with the read-out wirings in a plan view. This arrangement converts the potentially harmful electromagnetic field from the read-out wirings into a beneficial shielding effect, where the read-out wiring structure itself becomes part of the shielding mechanism to protect adjacent sensor circuits.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 proposed solution enhances biometric information recognition performance by optimizing the arrangement of circuits and electrodes, reducing interference and improving signal accuracy.

Implementation Method 1

an optical method of sensing incident light using an optical sensor

Methodology Applied

Scientific EffectOptical sensing: Photoelectric Effect

Implementation Method 2

an ultrasonic method of sensing vibration using a piezoelectric material

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Data Source

PatentUS20250120270A1Display device

Publication Date: 2025.04.10 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes a base layer, a circuit layer, and an element layer. The circuit layer includes pixel driving circuits connected to light emitting elements, sensor driving circuits connected to light receiving elements, and read-out wirings connected to the sensor driving circuits. A first pixel driving circuit from among the pixel driving circuits is continuously arranged in a direction parallel to the read-out wirings, and the first pixel driving circuit is connected to a first light emitting element from among the light emitting elements. The circuit layer further includes a first pixel connection electrode connecting the first pixel driving circuit to the first light emitting element, and the first pixel connection electrode does not cross the read-out wirings in a plan view.