Capsule Pattern Sidewall Coverage for Display Color Reproducibility
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Solution Overview
Problem
Current display devices face challenges in achieving high reliability and cost-effectiveness in manufacturing, particularly in developing display apparatuses that can accurately display images by applying electric fields to capsules containing multiple elements.
Innovation Solution
A display apparatus is designed with a substrate having a display area and non-display area, featuring a capsule pattern with display capsules and a cured photosensitive material, along with a common electrode covering the capsule pattern's sidewall, which includes first, second, and third sub-capsule patterns for different colors, and a method involving photolithography processes to form these patterns, reducing manufacturing complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple separate photolithography processes are used to form different color capsule patterns, then color reproducibility is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The capsule pattern is segmented into multiple color regions (first, second, and third sub capsule patterns for different colors) that are formed in separate photolithography processes. Each color capsule pattern is created independently through sequential photolithography steps, allowing precise control over color placement while maintaining manufacturing feasibility through systematic process division.
2Reliability
If additional layers are added to cover sidewalls of capsule patterns, then reliability is improved, but manufacturing cost and process complexity increase
Solution Approach 1:
The common electrode serves multiple functions: it acts as an electrical common reference for the display, provides structural coverage over the sidewalls of the capsule pattern to enhance reliability, and eliminates the need for separate protective layers. This multi-functional design reduces the total number of layers while maintaining or improving device reliability.
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 solution enhances color reproducibility and reduces manufacturing costs by simplifying the process and eliminating the need for additional layers, resulting in a more reliable and efficient display apparatus.
Implementation Method 1
a first photolithography process is performed on the first capsule layer to remove the first capsule layer from the second area and to form a first capsule pattern on the first area
Implementation Method 2
Each of the display capsules includes an element that is moved by applying an electric field to the display capsules
Data Source
AI summary
In a manufacturing method of a display apparatus, a substrate including a first area, which includes a first pixel, and a second area different from the first area is prepared. Then, a first capsule layer having first display capsules is formed on the substrate, and a first photolithography process is performed on the first capsule layer to remove the first capsule layer from the second area and to form a first capsule pattern on the first area.