Display Device Refractive Layer for Luminance-Preserving Angle Control

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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 mixture.

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, but the luminance 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 blocks light in specific directions while allowing light transmission in other directions, achieving viewing angle control without uniformly reducing luminance across all viewing angles

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the refractive layer have different light blocking characteristics. The first light blocking pattern blocks light in one direction, the second pattern blocks light in another direction, and the third pattern blocks light in a third direction. This local differentiation allows selective light blocking only in unwanted viewing angles while maintaining luminance in desired viewing angles

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 changes

Engineering Contradiction:

Improveviewing angle adjustmentVSAvoidcolor consistency

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The refractive layer is segmented into multiple light blocking patterns that selectively block light based on direction rather than wavelength. This segmentation ensures that only the angular distribution of light is modified while the spectral composition remains unchanged, preventing color shifts

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention replaces the conventional privacy protection film (which uses microlens arrays or directional refraction that can cause color separation) with a light blocking pattern system that uses opaque structures. This substitution eliminates the optical path differences that cause color dispersion, maintaining color consistency while achieving privacy protection

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 increases

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 deposited on the window or display panel. The light blocking patterns are formed within this thin layer using conventional thin-film deposition techniques, achieving the desired optical function without adding significant thickness to the display device

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

Instead of adding thickness in the vertical dimension (as conventional privacy films do), the invention uses planar patterns arranged in specific geometric configurations within a thin layer. The viewing angle control is achieved through the two-dimensional arrangement and orientation of the light blocking patterns rather than through thick three-dimensional structures

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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

Improves display quality by preventing color mixture and adjusting viewing angles while maintaining luminance, without the drawbacks of traditional privacy protection films.

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

PatentUS12393310B2Display device

Publication Date: 2025.08.19 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.