Display device

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Solution Overview

Problem

Existing liquid crystal display devices suffer from insufficient suppression of reflected light, particularly in the wavelength region exceeding 650 nm, leading to unwanted red coloration and high reflectance.

Innovation Solution

A display device design incorporating a first and second color filter, a first and second pixel electrode, a common electrode, an insulating film, and a light blocking part with a light blocking film, a first transmission film, and a reflection/transmission film, where the light blocking film has lower transmittance and higher reflectance than the transmission films, and the reflection/transmission film has lower reflectance and higher transmittance than the blocking film.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a transparent layer with film thickness of 30 nm is used to suppress reflection, then reflectance is lowered over most visible wavelengths, but reflectance becomes 5% or more in wavelength region exceeding 650 nm causing red coloration

Engineering Contradiction:

Improvereflected light suppressionVSAvoidred coloration

Core Design Contradiction:

Object-affected harmful factorsVSObject-generated harmful factors

Solution Approach 1:

The light blocking part is divided into three distinct film layers: light blocking film (first layer), first transmission film (second layer), and reflection/transmission film (third layer). Each layer has specific optical properties and works sequentially to block, transmit, and reflect light at different wavelengths, collectively achieving broad-spectrum reflection suppression without red coloration

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The light blocking part uses a composite structure of three different film materials with progressively increasing light transmittance from bottom to top. The light blocking film has lowest transmittance, first transmission film has intermediate transmittance, and reflection/transmission film has highest transmittance. This composite arrangement creates cumulative optical effects that suppress reflection across the entire visible spectrum while preventing red coloration

Inventive Principle:

Principle #40Composite materials

2Object-affected harmful factors

If a light blocking part is added to suppress reflection, then reflectance is reduced, but device structure becomes more complex

Engineering Contradiction:

Improvereflected lightVSAvoidstructure complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The light blocking part is integrated into the existing display device structure at the boundary between color filters, merging multiple functions (light blocking, transmission, and reflection control) into a single coordinated component rather than adding separate independent elements

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The light blocking part is positioned specifically at the boundary between color filters where reflection occurs, rather than covering the entire display surface. This localized approach suppresses reflection at critical areas while maintaining overall device simplicity and avoiding unnecessary complexity in non-critical regions

Inventive Principle:

Principle #3Local quality

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

Effectively reduces reflectance and suppresses color mixing, enhancing display quality by minimizing unwanted reflections and maintaining high resolution.

Implementation Method 1

the light blocking film has a light transmittance lower than a light transmittance of the first transmission film and a light transmittance of the reflection/transmission film

Methodology Applied

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

Implementation Method 2

the light blocking film has... a light reflectance higher than a light reflectance of the first transmission film and lower than a light reflectance of the light blocking film

Methodology Applied

Scientific EffectReflection: Reflection

Implementation Method 3

the first transmission film has the light transmittance higher than the light transmittance of the reflection/transmission film

Methodology Applied

Scientific EffectRefraction: Refraction

Implementation Method 4

the reflection/transmission film has a light reflectance higher than a light reflectance of the first transmission film and lower than a light reflectance of the light blocking film

Methodology Applied

Scientific EffectReflection: Reflection

Data Source

PatentUS12443068B2Display device

Publication Date: 2025.10.14 SHARP DISPLAY TECHNOLOGY CORP

AI summary

A display device includes a first color filter, a second color filter, a first pixel electrode, a second pixel electrode, a common electrode, an insulating film, and a light blocking part that is disposed at a boundary between the first color filter and the second color filter. The light blocking part includes a light blocking film, a first transmission film disposed on the upper layer side of the light blocking film, and a reflection/transmission film disposed on the upper layer side of the first transmission film, the light blocking film has a light transmittance lower than light transmittances of the first transmission film and the reflection/transmission film, the first transmission film has the light transmittance higher than that of the reflection/transmission film, and the reflection/transmission film has a light reflectance higher than that of the first transmission film and lower than that of the light blocking film.