Phase Change Ink Light Shielding for Stereoscopic Displays
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Solution Overview
Problem
Current stereoscopic image display devices face challenges in minimizing cross-talk while maintaining image brightness, due to limitations in forming precise light shielding patterns with existing curable ink compositions, which result in optical path errors and uneven pattern formation.
Innovation Solution
A stereoscopic image display device utilizing a phase change ink composition with a specific formulation, including a phase change material, coloring agent, reactive monomer, and photopolymerization initiator, to form a light shielding pattern with precise line widths and heights, effectively preventing cross-talk and maintaining image brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the width of the black matrix is extended to offset optical path error and pattern adjusting errors, then manufacturing precision is improved, but the amount of shielded light increases resulting in decreased brightness
Solution Approach 1:
The invention changes the physical and chemical parameters of the ink composition by incorporating phase change materials, reactive monomers, and photopolymerization initiators. This enables the ink to transition from liquid to solid state upon UV irradiation, forming black matrices with precise dimensions (line widths of 5-50 μm) without requiring excessive width extension, thereby maintaining image brightness while achieving accurate placement at boundary portions between left and right eye regions
Solution Approach 2:
The invention uses a composite ink composition containing multiple functional components: phase change material (e.g., fatty acids, waxes), coloring agents (pigments or dyes), reactive monomers/oligomers, and photopolymerization initiators. This composite formulation enables simultaneous achievement of precise pattern formation, uniform line heights, and accurate positioning, resolving the contradiction between manufacturing precision and brightness by eliminating the need for oversized black matrices
2Ease of manufacture
If curable ink with high spreadability is used to form black matrix, then ease of manufacture is improved, but line width variations occur due to surface state differences of base material
Solution Approach 1:
The invention changes the reological parameters of the ink by incorporating phase change materials that solidify upon UV irradiation. This phase transition from liquid to solid state prevents lateral spreading of the ink on the base material surface, ensuring uniform line widths regardless of surface energy variations. The reactive monomers and photopolymerization initiators enable rapid curing that locks the pattern dimensions before spreading can occur
Solution Approach 2:
The invention exploits the phase transition phenomenon of the ink composition from liquid state during printing to solid state upon UV irradiation. This phase change occurs rapidly after deposition on the base material, preventing the ink from spreading due to surface energy differences. The solidified pattern maintains precise line widths and uniform heights, resolving the contradiction between ease of manufacture and line width uniformity
3Ease of manufacture
If pattern line heights are kept low due to solvent volatilization differences, then ease of manufacture is improved, but light shielding effect becomes insufficient
Solution Approach 1:
The invention utilizes phase transition of the ink composition from liquid to solid upon UV irradiation to form three-dimensional patterns with controlled heights. The phase change enables the formation of patterns with line heights of 1-10 μm, which are sufficient to provide effective light shielding and prevent cross-talk between left and right eye images. This resolves the contradiction by enabling adequate pattern heights without the defects associated with conventional drying processes
Solution Approach 2:
The invention replaces the conventional drying mechanism (solvent volatilization) with a photopolymerization mechanism. Instead of relying on solvent evaporation that causes non-uniform line heights due to edge effects, the UV-curable ink composition undergoes photopolymerization to form patterns with uniform dimensions. This substitution enables precise control of pattern line heights to achieve sufficient light shielding effect while maintaining ease of manufacture
4Manufacturing precision
If photolithography method is used to form black matrix, then manufacturing precision is improved, but device complexity increases due to complicated processes and material consumption
Solution Approach 1:
The invention changes the chemical parameters of the ink composition to enable direct printing and UV curing, eliminating the need for complex photolithography processes such as photoresist coating, multiple development steps, and etching. The UV-curable ink with phase change materials can be directly printed onto the base material and cured to form precise black matrices in a single step, reducing device complexity while maintaining or improving manufacturing precision
Solution Approach 2:
The invention extracts and eliminates the unnecessary steps from the conventional photolithography process. By using UV-curable ink composition with phase change materials, the process is reduced to simply printing the pattern and irradiating with UV light, removing the need for photoresist layers, multiple chemical treatments, and complex equipment. This extraction of essential steps maintains manufacturing precision while significantly reducing device complexity and material consumption
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 use of phase change ink composition enables the formation of fine and uniform light shielding patterns, effectively reducing cross-talk while minimizing brightness loss, by allowing for precise control of line widths and heights, and maintaining stability across various temperatures.
Implementation Method 1
a phase change ink composition having a melting point of from 50°C. to 120°C.
Implementation Method 2
The phase change ink composition may include: 3 to 93 parts by weight of a phase change material; 3 to 30 parts by weight of a coloring agent; 3 to 90 parts by weight of a reactive monomer, an oligomer, or a mixture thereof; and 0.1 to 10 parts by weight of a photopolymerization initiator
Data Source
AI summary
There are provided a stereoscopic image display device and a method of manufacturing the stereoscopic image display device. The stereoscopic image display device includes: an image generation unit generating a left-eye image and a right-eye image; a 3D filter layer disposed above the image generation unit, the 3D filter layer including a first region through which the right-eye image passes and a second region through which the left-eye image passes; and a light shielding pattern disposed between the image generation unit and the 3D filter layer in a position corresponding to a boundary portion between the first region and the second region. The light shielding pattern is formed of a phase change ink composition.