Refractive Display Layer for Privacy Viewing Without Color Mixing

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Solution Overview

Problem

Privacy protection films in display devices reduce luminance, alter light color, and increase thickness, compromising display quality and viewing angle adjustment.

Innovation Solution

A display device design incorporating a refractive layer with multiple light blocking patterns and filling layers that refract and block light at specific angles, allowing for adjusted viewing angles without color mixing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a privacy protection film is attached on the window to adjust the viewing angle, then the viewing angle is adjusted for privacy protection, but the luminance of the display device is reduced

Engineering Contradiction:

Improveviewing angle adjustmentVSAvoidluminance

Core Design Contradiction:

Adaptability or versatilityVSIllumination intensity

Solution Approach 1:

The refractive layer is divided into multiple light blocking patterns (first, second, and third patterns) with different positions and orientations. Each pattern segment controls light in specific directions, collectively achieving viewing angle adjustment without requiring a single dense film that would block all light

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the refractive layer have different light blocking characteristics. The light blocking patterns are strategically positioned to block light only in specific unwanted directions while maintaining high luminance transmission in the desired viewing directions, achieving local optical property variation

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If a privacy protection film is attached on the window to adjust the viewing angle, then the viewing angle is adjusted, but the color of the light is changed

Engineering Contradiction:

Improveviewing angle adjustmentVSAvoidcolor accuracy

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The refractive layer acts as an intermediary optical element that redirects light paths through refraction and selective blocking rather than directly filtering light wavelengths. This indirect approach adjusts viewing angles without the color distortion that would result from direct light filtering

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

Instead of controlling light in the wavelength dimension (which would change color), the invention controls light in the spatial dimension using light blocking patterns. The patterns block light from specific angles while allowing all wavelengths to pass through, achieving angle control without color alteration

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Adaptability or versatility

If a privacy protection film is attached on the window to adjust the viewing angle, then the viewing angle is adjusted, but the thickness of the display device is increased

Engineering Contradiction:

Improveviewing angle adjustmentVSAvoidthickness

Core Design Contradiction:

Adaptability or versatilityVSLength of stationary object

Solution Approach 1:

The refractive layer is implemented as a thin film structure with light blocking patterns formed directly within the film matrix. This thin-film approach achieves viewing angle control without requiring thick protective films or additional layered structures

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The refractive layer combines multiple functions into a single integrated structure: it provides refractive index variation for light redirection, contains light blocking patterns for angle control, and maintains mechanical protection. This merging eliminates the need for separate thick privacy films and structural layers

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

Enhances display quality by preventing color mixing and adjusting viewing angles while maintaining luminance, and optionally includes touch sensitivity or improved color reproduction.

Implementation Method 1

a refractive layer disposed on the display layer and including a first light blocking pattern and a second light blocking pattern disposed on the first light blocking pattern

Methodology Applied

Scientific EffectRefraction: Refraction

Implementation Method 2

the first light blocking pattern and the second light blocking pattern may overlap each other... the light blocking patterns may block light

Methodology Applied

Scientific EffectLight blocking: Absorption (EM radiation)

Data Source

PatentUS20250355526A1Display device

Publication Date: 2025.11.20 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes a display layer disposed on a substrate and divided into an emission area from which light is emitted and a non-emission area adjacent to the emission area, a refractive layer disposed on the display layer and including a first light blocking pattern and a second light blocking pattern disposed on the first light blocking pattern, and a window disposed on the refractive layer.