Piezoelectric Sensor Overlap for Narrow Bezel Display

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Solution Overview

Problem

The challenge in display devices is to achieve a narrow bezel design while accommodating sensors, as traditional sensor placement in the bezel area can limit the reduction of bezel size.

Innovation Solution

Incorporating a sensor structure with a first and second piezoelectric material layer, a common electrode, and sensor pixel electrodes, which allows for overlapping sensor placement within the display area, enabling the detection of objects using ultrasonic waves and reducing the bezel size.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If sensors are placed in the bezel area, then sensor functionality is achieved, but the bezel size cannot be reduced further

Engineering Contradiction:

Improvebezel areaVSAvoidsensor placement flexibility

Core Design Contradiction:

Area of stationary objectVSAdaptability or versatility

Solution Approach 1:

The patent transitions sensor placement from the horizontal bezel dimension to the vertical stacking dimension by positioning piezoelectric material layers and electrodes in overlapping relationships above and below the display panel, enabling sensor functionality without occupying additional bezel area

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent embeds multiple sensor components (first and second piezoelectric material layers, common electrodes, sensor pixel electrodes) in a nested, overlapping configuration where layers are disposed above and below each other, effectively nesting sensor functionality within the existing display structure

Inventive Principle:

Principle #7Nested doll (Nesting)

2Area of moving object

If a narrow bezel design is implemented, then the image display area is increased, but sensor placement becomes limited

Engineering Contradiction:

Improveimage display areaVSAvoidsensor integration complexity

Core Design Contradiction:

Area of moving objectVSDevice complexity

Solution Approach 1:

The patent merges sensor components with the display panel structure by disposing piezoelectric material layers and electrodes in overlapping relationships with the display panel, combining sensor functionality with the existing display architecture rather than adding separate components

Inventive Principle:

Principle #5Merging (Combining)

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

This configuration allows for effective object detection and image display while minimizing the bezel area, enhancing the display device's design and functionality.

Implementation Method 1

the sensor includes a first piezoelectric material layer, a second piezoelectric material layer disposed under the first piezoelectric material layer to overlap the first piezoelectric material layer

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Data Source

PatentUS11062114B2Display device including sensor

Publication Date: 2021.07.13 LG DISPLAY CO LTD

AI summary

A display device comprises a display panel and a sensor, wherein the sensor includes a first piezoelectric material layer, a second piezoelectric material layer disposed under the first piezoelectric material layer to overlap the first piezoelectric material layer, a first common electrode disposed on the first piezoelectric material layer; a first sensor pixel electrode disposed under the second piezoelectric material layer, and a first element layer disposed under the first sensor pixel electrode and connected with the first sensor pixel electrode.