Pigment Mixing Layer for Flexible Display Anti-Reflection

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Solution Overview

Problem

Conventional display devices face challenges in achieving suitable contrast across varying ambient lighting conditions due to reflective components, and existing optical structures like polarizing plates and quarter wave plates are thick, reduce light transmittance, and are not suitable for flexible displays.

Innovation Solution

A display panel with a pigment mixing layer comprising pigments that absorb red, green, and blue light, located between the pixel driving layer and the light emitting surface, which reduces ambient light reflection and increases light transmittance, replacing the need for polarizing plates and quarter wave plates.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a polarizing plate and quarter wave plate are used to reduce ambient light reflection, then the contrast of the display device is improved, but the thickness of the display device increases and light transmittance decreases

Engineering Contradiction:

Improveambient light reflectionVSAvoidthickness of display device

Core Design Contradiction:

Object-affected harmful factorsVSLength of stationary object

Solution Approach 1:

The patent extracts and removes the polarizing plate and quarter wave plate from the display device structure, replacing them with a pigment mixing layer that achieves anti-reflection functionality without the thickness and transmittance penalties of conventional optical structures

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the material composition parameter by using specific pigments (first pigment absorbing red light, second pigment absorbing green light, third pigment absorbing blue light) in controlled proportions to achieve the desired anti-reflection effect while maintaining thin profile and high transmittance

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If a polarizing plate and quarter wave plate are used to reduce ambient light reflection, then the contrast of the display device is improved, but the light transmittance from pixels decreases

Engineering Contradiction:

Improveambient light reflectionVSAvoidlight transmittance from pixels

Core Design Contradiction:

Object-affected harmful factorsVSIllumination intensity

Solution Approach 1:

The patent applies local quality by using pigments with specific absorption characteristics targeted at different wavelength ranges (red, green, blue) to selectively absorb ambient light while allowing pixel light to pass through, achieving wavelength-selective optical properties in the pigment mixing layer

Inventive Principle:

Principle #3Local quality

3Object-affected harmful factors

If conventional optical structures are used to improve display contrast, then the contrast is improved, but the device complexity and manufacturing difficulty increase

Engineering Contradiction:

Improveambient light reflectionVSAvoidoptical structure complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent merges multiple optical functions (anti-reflection, color filtering, and brightness enhancement) into a single pigment mixing layer, eliminating the need for separate polarizing plates and quarter wave plates, thereby simplifying the overall optical structure and manufacturing process

Inventive Principle:

Principle #5Merging (Combining)

4Object-affected harmful factors

If conventional optical structures are used to improve display contrast, then the contrast is improved, but the suitability for flexible display devices decreases

Engineering Contradiction:

Improveambient light reflectionVSAvoidflexibility of display device

Core Design Contradiction:

Object-affected harmful factorsVSStrength

Solution Approach 1:

The patent employs a thin-film pigment mixing layer that can be integrated into flexible display structures, replacing rigid polarizing plates and quarter wave plates with a flexible, thin optical layer that maintains anti-reflection functionality while enabling device flexibility

Inventive Principle:

Principle #30Flexible shells and thin films

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 pigment mixing layer significantly reduces ambient light reflection, enhances visual brightness, and supports flexible display panels by maintaining high transmittance while reducing manufacturing complexity and costs.

Implementation Method 1

a first pigment that absorbs red light, a second pigment that absorbs green light, and a third pigment that absorbs blue light

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Data Source

PatentUS11456444B2Display panel, manufacturing method thereof, display device

Publication Date: 2022.09.27 BEIJING BOE TECH DEV CO LTD

AI summary

A display panel, a method for manufacturing the same, and a display device including the display panel are provided. The display panel includes a pixel array and a pigment mixing layer, the pigment mixing layer being located between a pixel driving layer and a light emitting surface of the display panel. The pigment mixing layer includes a mixture formed by a first pigment that absorbs red light, a second pigment that absorbs green light, and a third pigment that absorbs blue light. A proportion of the first pigment in the mixture is 15% to 20%, a proportion of the second pigment in the mixture is 50% to 80%, and a proportion of the third pigment in the mixture is 5% to 20%.