Color Filter Dam Pattern for Liquid Crystal Display Light Shielding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing liquid crystal display devices face challenges in manufacturing cost and aperture ratio reduction due to complex processes involved in forming color filter layers and light shielding frames, particularly with photolithography and ink jetting methods.
Innovation Solution
A method where a dam pattern is formed at the peripheral edge of the color filter layer, allowing light shielding material to be coated and dammed by the pattern, creating a continuous light shielding layer without the need for bank-like patterns, thus reducing manufacturing steps and preserving the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photolithography is used to form color filter layer and frame portion, then manufacturing precision is improved, but device complexity and manufacturing cost increase due to four processing steps
Solution Approach 1:
The patent merges the frame portion formation with the color filter layer formation by using the color filter material itself to form a dam pattern that serves as both the color filter boundary and the frame structure. This integration eliminates the need for separate bank patterns and reduces the number of processing steps while maintaining manufacturing precision.
Solution Approach 2:
The dam pattern formed by the color filter material serves multiple functions: it defines the color filter region, acts as a structural frame, and provides light shielding. This multi-functionality reduces device complexity by eliminating separate components while maintaining the necessary precision through the unified formation process.
2Ease of manufacture
If ink jetting method is used to form color filter layer, then manufacturing cost is reduced, but aperture ratio decreases due to need for bank-like patterns
Solution Approach 1:
The patent merges the dam pattern formation with the color filter layer deposition by using the same ink jetting process to form both. The color filter material is deposited to form the filter layer and simultaneously creates a dam pattern at the periphery, eliminating the need for separate bank patterns and preserving aperture ratio while maintaining cost-effectiveness.
Solution Approach 2:
The patent extracts the bank pattern function from the traditional ink jetting process by using the color filter material itself to form the dam structure. This eliminates the need for additional bank patterns that would reduce aperture ratio, while still providing the necessary structural support and light shielding function.
3Reliability
If separate bank pattern is formed before coating light shielding material, then light shielding performance is improved, but aperture ratio is reduced due to additional structures
Solution Approach 1:
The patent merges the dam pattern formation with the color filter layer creation, using the color filter material to form both the filter and the light shielding structure. This integration provides adequate light shielding performance while eliminating separate bank patterns, thereby preserving aperture ratio.
Solution Approach 2:
The dam pattern formed by the color filter material serves dual functions: it defines the color filter region and provides light shielding performance. This multi-functionality eliminates the need for separate bank patterns while maintaining both aperture ratio and light shielding effectiveness.
4Reliability
If multiple processing steps are used to form light shielding layer, then light shielding performance is improved, but productivity decreases due to increased manufacturing time
Solution Approach 1:
The patent merges the light shielding structure formation with the color filter layer deposition by using the color filter material to form the dam pattern. This integration provides sufficient light shielding performance while reducing manufacturing time and improving productivity by eliminating separate processing steps.
Data Source
AI summary
A color filter layer is formed on a glass substrate of a counter substrate. A bank pattern is formed of the same material as a red color-filter portion, a green color filter portion and a blue color filter portion of the color filter layer at the outside of the color filter layer on the glass substrate in the same step. A light shielding material is coated in a bank between the bank pattern and the color filter layer to form a light shielding layer. The light shielding layer can be formed so as to be continuous with the peripheral edge of the color filter layer. The light shielding layer is less likely to overlap with the inside of a display frame portion of the liquid crystal panel, and the aperture ratio is less likely to be reduced. The number of manufacturing steps of the light shielding layer is reduced.