Color Filter Alignment Mark Integration for Display Precision
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Solution Overview
Problem
In color display apparatuses, relative position errors between color filter patterns and alignment marks lead to misalignment with pixels, decreasing display quality due to fabrication process factors.
Innovation Solution
A color display apparatus design where the alignment mark is integrated into the filter layer of the color filter, allowing direct use as an alignment benchmark during assembly with the driving substrate, improving alignment precision between color filter patterns and pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the alignment mark of the black resin layer is used as the alignment benchmark during assembly, then the assembly process is simplified, but the color filter patterns are easily misaligned with pixels due to fabrication position errors
Solution Approach 1:
The patent merges the alignment mark function with the color filter pattern structure by forming the alignment mark and color filter patterns simultaneously in the same photoresist layer using a single photo mask. This integration ensures that the alignment mark and color filter patterns share the same reference baseline, eliminating relative position errors that occur when using separate alignment marks on the black resin layer.
Solution Approach 2:
The patent introduces a new intermediary element - the alignment mark formed within the color filter pattern layer itself - that serves as the direct alignment benchmark during assembly. This intermediary alignment mark, being part of the same photoresist structure as the color filter patterns, provides a more reliable reference than the black resin layer alignment mark, thereby improving alignment precision without complicating the assembly process.
2Reliability
If separate alignment marks are formed on the black resin layer and driving substrate, then the alignment benchmark is established early, but fabrication process errors cause relative position deviations
Solution Approach 1:
The patent combines the alignment mark formation with the color filter pattern formation into a single integrated process. Both the alignment mark and color filter patterns are formed simultaneously in the same photoresist layer using one photo mask, ensuring they share identical fabrication references and eliminating cumulative position errors from multiple fabrication steps.
Solution Approach 2:
The patent performs the alignment mark formation as a preliminary action within the color filter pattern layer before assembly. By establishing the alignment mark as an inherent part of the color filter structure during the same fabrication process, the alignment reference is prepared in advance with guaranteed positional accuracy relative to the color filter patterns.
Data Source
AI summary
A color display apparatus includes a driving substrate, a color filter and a display layer. The driving substrate has a display region and a non-display region, and at least a first alignment mark is disposed on the non-display region. The color filter is opposite to the driving substrate. The color filter includes a substrate and a filter layer disposed on the substrate. The substrate has a first region corresponding to the display region and a second region corresponding to the non-display region. The filter layer includes color filter patterns located on the first region and at least a second alignment mark located on the second region and corresponding to the first alignment mark. The display layer is disposed between the driving substrate and the color filter. Alignment precision between the driving substrate and the color filter of the color display apparatus is improved. Besides, a color filter is also provided.