Display Panel Barriers with Differential Optical Density

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Solution Overview

Problem

Current display panels using self-luminous display technology face issues of light crosstalk between sub-pixels of different colors and low brightness due to inefficient light utilization.

Innovation Solution

The display panel incorporates a first and second barrier with different optical densities and reflectivities, arranged between the light-emitting units and color changing layers, to minimize light crosstalk and enhance light utilization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a single barrier layer is used between light-emitting units and color changing layers, then the structure is simple, but light crosstalk between sub-pixels cannot be effectively reduced and light utilization is insufficient

Engineering Contradiction:

Improvelight crosstalkVSAvoidbarrier structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The single barrier layer is divided into multiple barrier layers (first barrier layer, second barrier layer, third barrier layer) with different optical densities and functions. Each layer is positioned at specific locations between light-emitting units and color changing layers to selectively block light in different directions and wavelengths, thereby reducing light crosstalk while maintaining structural clarity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different barrier layers are assigned different optical densities and material compositions based on their specific positions and functions. The first barrier layer has higher optical density for blocking oblique light, while the second and third layers have optimized properties for their respective locations, creating local quality variations that address specific light crosstalk problems without over-complicating the entire structure.

Inventive Principle:

Principle #3Local quality

2Use of energy by moving object

If light-emitting units emit light in all directions, then light emission is comprehensive, but light crosstalk between adjacent sub-pixels increases

Engineering Contradiction:

Improvelight utilizationVSAvoidlight crosstalk

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The barrier layers are designed to convert harmful oblique light that would cause crosstalk into beneficial reflected light that returns to the intended sub-pixel. The first barrier layer reflects oblique light back toward the light-emitting unit, while the second and third layers further manage light direction, thereby converting potential crosstalk into useful light emission and improving overall light utilization efficiency.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Object-affected harmful factors

If barrier layers with high optical density are used to block light, then light crosstalk is reduced, but overall brightness of the display panel decreases

Engineering Contradiction:

Improvelight crosstalkVSAvoiddisplay brightness

Core Design Contradiction:

Object-affected harmful factorsVSIllumination intensity

Solution Approach 1:

Different barrier layers have different optical densities optimized for their specific functions. The first barrier layer has higher optical density for blocking oblique light, while the second and third layers have lower optical densities that allow more light transmission. This local quality differentiation reduces light crosstalk in critical areas while maintaining overall brightness through selective light management rather than uniform blocking.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Instead of simply absorbing or blocking light, the barrier layers are designed to reflect and redirect light back toward the intended sub-pixels. This converts potentially harmful scattered light into beneficial light emission, reducing crosstalk while maintaining or even enhancing overall display brightness through improved light utilization.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 configuration effectively reduces light crosstalk between sub-pixels and increases the brightness of the display panel by optimizing light extraction and absorption.

Implementation Method 1

an optical density of the first barrier is different from an optical density of the second barrier

Methodology Applied

Scientific EffectAbsorption (EM radiation): Absorption (EM radiation)

Implementation Method 2

a reflectivity of the first barrier is different from a reflectivity of the second barrier

Methodology Applied

Scientific EffectReflection: Reflection

Data Source

PatentUS12207485B2Display panel and display device

Publication Date: 2025.01.21 HUBEI YANGTZE IND INNOVAION CENT OF ADVANCED DISPLAY CO LTD

AI summary

The present disclosure provides a display panel and a display device including the display device. The display panel includes: a first substrate including a plurality of light-emitting units, a second substrate opposed to the first substrate and including a plurality of color changing layers having different colors; and a first barrier and a second barrier arranged between the first substrate and the second substrate. The plurality of color changing layers one-to-one correspond to the plurality of light-emitting units; the first barrier overlaps the second barrier in a thickness direction of the display panel; and an optical density of the first barrier is different from an optical density of the second barrier, and a reflectivity of the first barrier is different from a reflectivity of the second barrier.