Black Composite Particles for Thin High-OD Resin Matrices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional resin black matrices in liquid crystal displays have insufficient light-shielding performance, leading to issues with flatness and adhesion, and require thicker films to achieve higher optical density (OD) values, which can disrupt liquid crystal alignment and increase surface steps.
Innovation Solution
The use of black composite particles represented by the composition formula TiNxOy·zX, where X is a metal atom such as copper, silver, gold, platinum, or tin, with a specific oxygen content and specific surface area, dispersed in a resin composition to form a thin, high-OD black matrix.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the volume ratio of light shielding agent is increased to achieve higher OD value and thinner film, then light-shielding performance is improved, but adhesion of resin black matrix to glass decreases and peeling occurs
Solution Approach 1:
The invention changes the particle size parameter of the light shielding agent to 0.01 μm or less, which fundamentally alters how the particles interact with light and resin. This ultra-fine size enables achieving high OD values with lower volume ratios, thereby maintaining adhesion while improving light-shielding performance
Solution Approach 2:
The invention uses composite particles consisting of metal core (silver, aluminum, or zinc) covered with carbon compound shell. This composite structure combines the high light-shielding capability of metals with the adhesion and stability benefits of carbon compounds, resolving the contradiction between OD value and adhesion
2Illumination intensity
If the resin black matrix is made thicker to achieve higher OD value, then light-shielding performance is improved, but flatness of color filter is deteriorated and surface steps increase
Solution Approach 1:
By changing the particle size parameter to 0.01 μm or less, the invention achieves much higher light-shielding efficiency per unit volume. This allows forming thin films with high OD values that maintain good flatness and minimize surface steps, eliminating the need for thick coatings
3Reliability
If conventional light shielding agents (carbon black, titanium nitride oxide) are used, then adhesion and resistance are maintained, but OD value is insufficient
Solution Approach 1:
The invention creates composite particles with metal core (providing high light-shielding performance) and carbon compound shell (providing adhesion and stability). This composite structure achieves superior OD values while maintaining the adhesion and resistance properties of conventional materials
Solution Approach 2:
The invention fundamentally changes the particle size parameter to 0.01 μm or less, which dramatically increases the surface area to volume ratio and light-interaction efficiency, enabling much higher OD values with smaller amounts of material while maintaining other properties
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 black composite particles enable the formation of a thin resin black matrix with high light-shielding performance, maintaining adhesion and achieving high OD values without the need for over-coats, resulting in improved display flatness and performance in liquid crystal displays.
Implementation Method 1
black composite particles having a high light-shielding performance
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Disclosed are black composite particles having a high light-shielding performance suitable as a black component such as a black matrix in a color filter. Further disclosed is a black resin composition from which a black matrix having a high light-shielding performance can be formed. The black composite particles are represented by the composition formula: TiNxOy·zX (wherein X is a metal atom such as silver; x is a number greater than 0 and less than 2; y is a number not less than 0 and less than 2; and z is a number greater than 0 and less than 10). The black resin composition comprises at least a light shielding agent, a resin, and a solvent and comprises the black composite particles as the light shielding agent.