Display Device Touch Sensor Integration via Cathode and Black Matrix

Solution Overview

Problem

The existing process of manufacturing touchscreens is complex and costly due to separate manufacturing and attachment to display panels, increasing the size of the bezel area.

Innovation Solution

A display device design where grouped cathode electrodes and black matrices intersect with an encapsulation unit to form a touch sensor, omitting the need to form separate touch electrodes and adhesion processes, simplifying the structure and reducing costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the touchscreen is separately manufactured and attached to the display panel using adhesive, then the touch sensing functionality is achieved, but the manufacturing process becomes complicated and costs increase

Engineering Contradiction:

Improvetouch sensing functionalityVSAvoidmanufacturing process complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the touchscreen structure with the display panel structure by forming the first touch electrode using the cathode electrode of the light emitting element and the second touch electrode using the black matrix. This integration eliminates the need for separate touchscreen manufacturing and attachment processes, thereby reducing manufacturing complexity while maintaining touch sensing functionality.

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If the touchscreen is separately manufactured and attached to the display panel using adhesive, then the touch sensing functionality is achieved, but manufacturing costs increase

Engineering Contradiction:

Improvetouch sensing functionalityVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent merges the touchscreen structure with the display panel structure by forming the first touch electrode using the cathode electrode of the light emitting element and the second touch electrode using the black matrix. This integration eliminates the need for separate touchscreen manufacturing and attachment processes, thereby reducing manufacturing complexity while maintaining touch sensing functionality.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If the touchscreen is separately manufactured and attached to the display panel, then the touch sensing functionality is achieved, but the bezel area size increases

Engineering Contradiction:

Improvetouch sensing functionalityVSAvoidbezel area

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The patent merges the touchscreen structure with the display panel structure by forming the first touch electrode using the cathode electrode of the light emitting element and the second touch electrode using the black matrix. This integration eliminates the need for separate touchscreen manufacturing and attachment processes, thereby reducing manufacturing complexity while maintaining touch sensing functionality.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS11327592B2Display device

Publication Date: 2022.05.10 LG DISPLAY CO LTD

AI summary

A display device that is capable of being manufactured through a simplified process and at reduced cost is disclosed. The display device is configured such that a plurality of grouped cathode electrodes and a plurality of grouped black matrices intersect each other in the state in which an encapsulation unit is disposed therebetween in order to form a touch sensor, so that a process of forming first and second touch electrodes is omitted and a separate adhesion process becomes unnecessary, whereby structural simplification is achieved while costs are reduced.