Color Filter Substrate Asymmetric Light-Shielding Sidewalls

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Solution Overview

Problem

There is a need to reduce the thickness of color filter substrates in liquid-crystal displays to accommodate the trend towards thinner and higher transmission displays, while maintaining effective light shielding and image quality.

Innovation Solution

A color filter substrate design featuring a light-shielding layer with sidewalls of different angles, where the second angle is less than the first, and a planarization layer to minimize protrusions and reduce the thickness of the substrate, allowing for improved light transmittance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of stationary object

If the thickness of the color filter substrate is reduced, then the display becomes thinner and has higher light transmission, but the light shielding capability may be compromised

Engineering Contradiction:

Improvethickness of color filter substrateVSAvoidlight leakage

Core Design Contradiction:

Length of stationary objectVSObject-affected harmful factors

Solution Approach 1:

The light-shielding layer employs asymmetric sidewall angles where the first sidewall forms a first angle with the substrate surface and the second sidewall forms a second angle that is less than the first angle. This asymmetric configuration optimizes light shielding effectiveness while minimizing the thickness of the color filter substrate, resolving the contradiction between substrate thinness and light shielding capability.

Inventive Principle:

Principle #4Asymmetry

2Length of stationary object

If the thickness of the color filter substrate is reduced, then the display becomes thinner, but color mixture between adjacent pixels may increase

Engineering Contradiction:

Improvethickness of color filter substrateVSAvoidcolor mixture prevention

Core Design Contradiction:

Length of stationary objectVSEase of manufacture

Solution Approach 1:

The asymmetric sidewall configuration of the light-shielding layer creates distinct separation between adjacent color filter pixels. The different angles of the first and second sidewalls ensure that the light-shielding layer effectively isolates adjacent pixels, preventing color mixture while maintaining reduced substrate thickness.

Inventive Principle:

Principle #4Asymmetry

3Length of stationary object

If the thickness of the color filter substrate is reduced, then the display becomes thinner, but manufacturing precision requirements increase

Engineering Contradiction:

Improvethickness of color filter substrateVSAvoidsidewall angle control

Core Design Contradiction:

Length of stationary objectVSManufacturing precision

Solution Approach 1:

The patent specifies that the first angle and second angle differ by a predetermined range (3.5° to 20°), providing clear manufacturing guidelines for forming the asymmetric light-shielding layer. This controlled asymmetry achieves effective light shielding and pixel separation while maintaining feasible manufacturing precision requirements.

Inventive Principle:

Principle #4Asymmetry

Data Source

PatentUS9784893B2Color filter substrate and display panel

Publication Date: 2017.10.10 RED OAK INNOVATIONS LTD

AI summary

A color filter substrate which includes: a substrate having a surface; a light-shielding layer disposed on the surface; a first color filter layer; and a second color filter layer disposed over the substrate, the second color filter layer covers the light-shielding layer and the first color filter layer and has a second main body on the surface, the light-shielding layer is located between the first color filter layer and the second color filter layer, at least a part of the first main body has a first thickness and at least a part of the second main body has a second thickness, and the first thickness is less than the second thickness.