Barrier Layer Display Layout for Viewing Angle and Luminance

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Solution Overview

Problem

Display devices used in vehicles face issues with reduced luminance and deteriorated touch sensitivity due to the use of light control films that block light emitted along a vertical direction to prevent view obstruction.

Innovation Solution

A display device design that incorporates first and second barrier layers and lenses to control or cut off viewing angles without the need for a light control film, enhancing light collection efficiency and maintaining touch sensitivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a light control film is attached to block light emitted along a vertical direction, then viewing angle control is improved, but luminance is reduced and touch sensitivity is deteriorated

Engineering Contradiction:

Improveviewing angle controlVSAvoidluminance

Core Design Contradiction:

Adaptability or versatilityVSIllumination intensity

Solution Approach 1:

The patent merges the light blocking function and light guiding function into a single integrated barrier layer structure. The barrier layer simultaneously blocks light in vertical directions (viewing angle control) and guides light in front directions (luminance enhancement), eliminating the need for separate light control films that would reduce luminance and touch sensitivity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The barrier layer is positioned specifically in the non-light emitting area of the display panel, allowing different regions to have different optical properties. The light emitting area maintains high luminance while the non-light emitting area provides viewing angle control through the barrier layer's selective light blocking and guiding characteristics.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If a light control film is attached to block light emitted along a vertical direction, then viewing angle control is improved, but touch sensitivity is deteriorated

Engineering Contradiction:

Improveviewing angle controlVSAvoidtouch sensitivity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The barrier layer integrates multiple functions including light blocking, light guiding, and touch sensing capability. By combining these functions into a single layer structure positioned in the non-light emitting area, the patent maintains touch sensitivity while achieving viewing angle control, avoiding the need for additional light control films that would interfere with touch input.

Inventive Principle:

Principle #5Merging (Combining)

3Adaptability or versatility

If a light control film is attached to control viewing angle, then light blocking in vertical direction is improved, but light collection efficiency is reduced

Engineering Contradiction:

Improveviewing angle controlVSAvoidlight collection efficiency

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The barrier layer is strategically positioned only in the non-light emitting area, allowing the light emitting area to maintain high light extraction and collection efficiency. The local placement ensures that light emitted from the display area is not blocked, while viewing angle control is achieved in the non-display region where light blocking is beneficial.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The barrier layer acts as an intermediary structure that redirects light paths without absorbing or blocking light from the emitting area. It mediates between the light emitted from the display and the viewing angle requirements by guiding light in beneficial directions while blocking light in unwanted vertical directions.

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

The design effectively manages viewing angles and improves luminance while preserving touch sensitivity by using barrier layers and lenses to direct light towards the front direction, eliminating the need for additional films.

Implementation Method 1

at least one first barrier layer on the non-light emitting area of the display panel, the at least one first barrier layer configured to block light emitted from the light emitting area

Methodology Applied

Scientific EffectLight blocking: Absorption (EM radiation)

Implementation Method 2

at least one lens overlapping the light emitting area and on a same layer as the at least one first barrier layer

Methodology Applied

Scientific EffectLight refraction and focusing: Lens

Data Source

PatentUS12386473B2Display device including a barrier layer to block light

Publication Date: 2025.08.12 LG DISPLAY CO LTD

AI summary

A display device may include: a display panel including a display area and a non-display area, the display area having a light emitting area and a non-light emitting area; at least one first barrier layer on the non-light emitting area of the display panel, the at least one first barrier layer configured to block light emitted from the light emitting area; at least one second barrier layer overlapping the at least one first barrier layer in the non-emitting area, the at least one second barrier layer configured to block light emitted from the light emitting area; and at least one lens overlapping the light emitting area and on a same layer as the at least one first barrier layer.