Touch Sensor Integration on Display Encapsulation Unit

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Solution Overview

Problem

The complexity and cost of attaching a touchscreen to a display device, such as a liquid crystal display panel or organic electroluminescent diode display panel, are increased due to the separate manufacturing and attachment process, which complicates the overall process and raises costs.

Innovation Solution

Integrating touch sensors onto an encapsulation unit that covers light emitting elements and using an anti-reflective film with a photosensitive material and black pigment on routing lines connected to the touch sensors, with a conductive layer as the uppermost layer, allowing for improved visibility and eliminating the need for a separate attachment process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a touchscreen is separately manufactured and attached to the display panel, then the touch functionality is achieved, but the overall process becomes complicated and costs increase

Engineering Contradiction:

Improvemanufacturing process simplicityVSAvoidattachment process complexity

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The patent merges the touchscreen structure with the display panel by integrating touch sensors directly onto the encapsulation unit of the display device. This combination eliminates the need for separate touchscreen manufacturing and attachment processes, thereby simplifying the overall manufacturing process and reducing device complexity while maintaining touch functionality

Inventive Principle:

Principle #5Merging (Combining)

2Ease of manufacture

If a touchscreen is separately manufactured and attached to the display panel, then the touch functionality is achieved, but costs are raised

Engineering Contradiction:

Improvemanufacturing costVSAvoidseparate attachment process

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

Inventive Principle:

Principle #5Merging (Combining)

3Illumination intensity

If routing lines are exposed without anti-reflective treatment, then the structure is simple, but visibility of external light is reduced

Engineering Contradiction:

Improvevisibility of external lightVSAvoidanti-reflective film structure

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The patent applies anti-reflective films with specific properties (photosensitive material and black pigment) only to specific areas where routing lines are located, rather than treating the entire display surface. This localized treatment improves visibility by reducing light reflection from routing lines while minimizing the addition of overall device complexity

Inventive Principle:

Principle #3Local quality

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 approach simplifies the manufacturing process and reduces costs by integrating touch sensors directly onto the display device, enhancing visibility through anti-reflective films and eliminating the need for additional protective structures, thereby achieving process simplification and cost reduction.

Implementation Method 1

an anti-reflective film including a photosensitive material and a black pigment is arranged on routing lines connected to the touch sensors and a conductive layer arranged as an uppermost layer among a plurality of conductive layers included in the touch sensors. Thereby, visibility of external light is improved by the anti-reflective film

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Data Source

PatentUS10763313B2Display device

Publication Date: 2020.09.01 LG DISPLAY CO LTD

AI summary

Disclosed is a display device which may achieve process simplification and cost reduction. In the display device having touch sensors, the touch sensors are arranged on an encapsulation unit arranged to cover light emitting elements, and an anti-reflective film including a photosensitive material and a black pigment is arranged on routing lines connected to the touch sensors and a conductive layer arranged as an uppermost layer among a plurality of conductive layers included in the touch sensors. Thereby, visibility of external light may be improved by the anti-reflective film, and the touch electrodes are arranged on an encapsulation unit without a separate attachment process and, thus, process simplification and cost reduction of the display device may be achieved.