Liquid Crystal Display Color Filter Substrate Light-Shielding Layers

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Solution Overview

Problem

Liquid crystal displays face challenges in preventing color mixture when viewed from an oblique angle and in ensuring that non-display areas do not appear brighter than display areas when turned off, which affects display quality and aperture ratio.

Innovation Solution

A liquid crystal display configuration with a first and second color filter, light-shielding layers of different thicknesses, and spacers of equal height, where the second color filter is positioned between the light-shielding layer and the insulating substrate, and a sealing member with a filler to maintain uniform cell gap and prevent light leakage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a light-shielding layer is disposed between color filters of different colors to prevent color mixture, then color mixture prevention is improved, but the aperture ratio decreases due to the additional layer occupying space

Engineering Contradiction:

Improvecolor mixtureVSAvoidaperture ratio

Core Design Contradiction:

Object-affected harmful factorsVSArea of stationary object

Solution Approach 1:

The patent applies different thicknesses of light-shielding layers in different regions: a first light-shielding layer with greater thickness is disposed between color filters of different colors to prevent color mixture, while a second light-shielding layer with smaller thickness is disposed in the non-display area to prevent light leakage. This local differentiation optimizes the balance between color mixture prevention and aperture ratio maintenance.

Inventive Principle:

Principle #3Local quality

2Illumination intensity

If different coloring layers and light-shielding coloring layers are stacked on the non-display area to prevent brightness mismatch, then the non-display area brightness control is improved, but the device structure becomes more complex

Engineering Contradiction:

Improvenon-display area brightnessVSAvoidlayer structure

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The patent combines the light-shielding function and the brightness control function into a single second light-shielding layer disposed in the non-display area. This layer simultaneously prevents light leakage from the display area and controls the brightness of the non-display area, eliminating the need for separate coloring layers and light-shielding layers that would otherwise be required.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The second light-shielding layer serves multiple functions: it acts as a light-shielding barrier to prevent light leakage into the non-display area, and simultaneously functions as a brightness control element for the non-display area. This multi-functionality simplifies the overall device structure while achieving the desired brightness uniformity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Stability of the object's composition

If spacers of equal height are used in both display and non-display areas to maintain uniform cell gap, then cell gap uniformity is improved, but light leakage may occur in the non-display area

Engineering Contradiction:

Improvecell gap uniformityVSAvoidlight leakage

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The patent maintains spacers of equal height in both display and non-display areas to ensure uniform cell gap, which is critical for display quality. Simultaneously, it introduces a second light-shielding layer with smaller thickness in the non-display area that specifically addresses light leakage without disrupting the uniform cell gap structure, as the light-shielding function is provided laterally rather than through vertical spacing variation.

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

This configuration effectively suppresses color mixture and maintains uniform display quality, improving brightness and definition by optimizing the light-shielding layers and spacers, and ensuring the non-display area does not appear brighter than the display area.

Implementation Method 1

a first light-shielding layer disposed in the display area and provided on a first substrate side of the first color filter, and a second light-shielding layer disposed in the non-display area and provided on a first substrate side of the second color filter

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Data Source

PatentUS10802347B2Display device and color filter substrate

Publication Date: 2020.10.13 MAGNOLIA WHITE CORP

AI summary

According to one embodiment, a liquid crystal display includes a first substrate, a second substrate including an insulating substrate, a first color filter, a second color filter, a first light-shielding layer, a second light-shielding layer, a first spacer and a second spacer, and a sealing member surrounding the second spacer and including a filler, and the first spacer having a same height as that of the second spacer, being in contact with the first substrate, the filler being interposed between the second spacer and the first substrate, and a thickness from the inner surface of the insulating substrate to a bottom of the second spacer being less than a thickness from the inner surface of the insulating substrate to a bottom of the first spacer.