Vehicle Display Encapsulation With Directional Light Blocking

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Solution Overview

Problem

Existing display devices in vehicles emit light that can interfere with the driver's view by reflecting off the front glass at night, and there is a need to block moisture and air ingress while improving touch sensing performance.

Innovation Solution

A light emitting display device with a substrate, light emitting layer, and encapsulation layer that includes a lower inorganic encapsulation layer, an organic encapsulation layer with light blocking structures, and an upper inorganic encapsulation layer, where the organic encapsulation layer has barrier layers and spaces filled with air to control light emission direction and enhance moisture and air barrier properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a conventional encapsulation layer is used, then moisture and air barrier properties are provided, but light is emitted in all directions causing reflection on the front glass and interfering with the driver's view

Engineering Contradiction:

Improvelight reflection on front glassVSAvoidmoisture and air barrier

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The encapsulation layer is segmented into multiple functional components: a base encapsulation layer for moisture and air barrier, and multiple light blocking structures (first, second, and third light blocking structures) with different orientations and positions. These segmented structures work together to block light in specific directions while preserving the encapsulation function.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the encapsulation layer are assigned different functions: the base encapsulation layer provides moisture and air barrier properties, while specific localized light blocking structures are positioned at predetermined positions to block light in specific directions. The first light blocking structure blocks light toward the front glass, the second blocks light toward the passenger seat, and the third blocks light toward the rear seat, creating local quality variations to solve the contradiction.

Inventive Principle:

Principle #3Local quality

2Reliability

If the encapsulation layer is made thicker to improve barrier properties, then moisture and air ingress is reduced, but touch sensing performance deteriorates due to increased dielectric constant

Engineering Contradiction:

Improvemoisture and air barrierVSAvoidtouch sensing performance

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The encapsulation layer uses a composite structure combining organic and inorganic materials. The base encapsulation layer uses organic material with low dielectric constant for good touch sensing performance, while inorganic light blocking structures are embedded to provide moisture and air barrier properties. This composite approach allows achieving both barrier performance and touch sensing performance without increasing overall thickness.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent changes the material parameters by selecting organic materials with low dielectric constants for the base encapsulation layer and using inorganic materials with high barrier properties for the light blocking structures. By changing material parameters rather than increasing thickness, the patent achieves improved barrier performance while maintaining good touch sensing performance.

Inventive Principle:

Principle #35Parameter changes

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 solution effectively blocks light emission in specific directions, prevents reflection on the vehicle's front glass, reduces moisture and air ingress, and enhances touch sensing performance by lowering the dielectric constant of the encapsulation layer.

Implementation Method 1

The barrier layer may include one of TiO2, Al2O3, SiO2, and Fe2O3 and has low-reflection characteristics

Methodology Applied

Scientific EffectLight blocking: Absorption (EM radiation)

Implementation Method 2

Each of the plurality of light blocking structures includes a barrier layer, a capping layer, and a space filled by an air and surrounded by the barrier layer and the capping layer

Methodology Applied

Scientific EffectDielectric constant reduction: Dielectric Permittivity

Data Source

PatentUS20250366356A1Light emitting display device, manufacturing method thereof, and car having light emitting display device

Publication Date: 2025.11.27 SAMSUNG DISPLAY CO LTD

AI summary

According to embodiments, a light emitting display device includes a substrate, a light emitting layer disposed on the substrate, and an encapsulation layer that covers the light emitting layer and includes a lower inorganic encapsulation layer and an organic encapsulation layer. The organic encapsulation layer includes a plurality of light blocking structures extending longitudinally in one direction in an area overlapping the light emitting layer. Each of the plurality of light blocking structures includes a barrier layer, a capping layer, and a space filled by an air and surrounded by the barrier layer and the capping layer.