Electro-Optical Device Evaluation Pattern for Color Filter Dimension Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electro-optical devices with organic electroluminescence (EL) elements face challenges in accurately measuring and controlling the dimensions and positions of color filter layers, particularly when edge portions of adjacent layers are in contact or overlap, which affects the viewing angle characteristics and display quality.
Innovation Solution
Incorporating an evaluation pattern on the sealing part of the electro-optical device, including dimension and position evaluation patterns, allows for precise measurement and control of the color filter layers' dimensions and positions, ensuring accurate formation and improved viewing angle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If edge portions of coloring layers are in contact or overlap to achieve compact color filter structure, then device miniaturization is improved, but measurement precision of coloring layer dimensions and positions deteriorates
Solution Approach 1:
The invention separates the coloring layers from the evaluation pattern in space. The evaluation pattern is disposed in a non-display area while coloring layers are in a display area, allowing independent measurement of the evaluation pattern without interference from adjacent coloring layers, thus maintaining measurement precision while enabling compact device structure
Solution Approach 2:
The invention introduces an evaluation pattern as an intermediary element that serves as a reference for measuring coloring layer dimensions and positions. This evaluation pattern is specifically designed with features (such as spaced evaluation coloring layers) that enable accurate measurement without being affected by the compact arrangement of display coloring layers
2Manufacturing precision
If evaluation pattern is added to enable accurate measurement of color filter, then manufacturing precision of coloring layer is improved, but device complexity increases
Solution Approach 1:
The invention merges the evaluation pattern formation with the existing color filter manufacturing process. Both the evaluation pattern and color filter are formed in the same photolithography process, utilizing the same photosensitive resin layer and processing steps, thereby avoiding additional manufacturing steps and minimizing device complexity
Solution Approach 2:
The photosensitive resin layer serves multiple functions: it forms both the evaluation pattern and the color filter coloring layers. This multi-functionality reduces the need for separate manufacturing processes and materials, thereby improving manufacturing precision without significantly increasing device complexity
Data Source
AI summary
An organic EL device includes a substrate; an organic EL element that is disposed on the substrate; a sealing part that is formed to cover the organic EL element; a color filter that includes coloring layers formed on the sealing part; and a dimension evaluation pattern for evaluating dimensional accuracy of the color filter.