Liquid Crystal Display Color Filter Overlap for Alignment and Aperture
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Solution Overview
Problem
In liquid crystal display devices, accurate alignment of pixel electrodes and color filters on different substrates is challenging, leading to alignment errors, and the formation of a larger black matrix decreases the aperture ratio, while varying cell gaps result in non-uniform image display and image quality issues.
Innovation Solution
A liquid crystal display device design where the first and second color filters are spaced apart and overlapped in specific regions, with a shielding electrode interposed between the data line and common electrode, and spacers of different heights made from the same material to secure uniform cell gaps and prevent light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pixel electrodes and color filters are formed on different substrates, then manufacturing process is simplified, but alignment accuracy deteriorates
Solution Approach 1:
The display panel is divided into a first substrate containing pixel electrodes and a second substrate containing color filters, allowing independent formation and optimization of each component while maintaining simplified manufacturing processes for each substrate separately
Solution Approach 2:
A bonding structure is introduced as an intermediary between the first and second substrates to precisely align and bond the pixel electrodes with the corresponding color filters, ensuring high alignment accuracy while keeping the manufacturing process simplified
2Reliability
If black matrix size is increased to account for bonding margin, then bonding reliability is improved, but aperture ratio deteriorates
Solution Approach 1:
The alignment marks and bonding structures are designed in advance with precise dimensions and positions, allowing accurate alignment to be achieved without requiring excessive bonding margin, thus preventing unnecessary reduction of aperture ratio while ensuring bonding reliability
Solution Approach 2:
The size and position parameters of the black matrix and bonding structures are precisely optimized to provide just enough bonding margin for reliable bonding while minimizing the area occupied by light-blocking regions, thereby maintaining high aperture ratio
3Ease of manufacture
If cell gap is not maintained uniformly, then manufacturing flexibility is improved, but image quality deteriorates
Solution Approach 1:
Different regions of the display panel are provided with locally optimized structures, including alignment marks and bonding features with specific dimensional characteristics that ensure uniform cell gap formation across the entire panel while allowing manufacturing flexibility
Solution Approach 2:
The bonding structure is designed to create uniform spacing and alignment between the first and second substrates across the entire bonding area, ensuring consistent cell gap uniformity throughout the display panel during the bonding process
Data Source
AI summary
A liquid crystal display device includes: a first substrate including a first light blocking region where a plurality of transistors are formed and a second light blocking region where a data line is extended in a vertical direction; a first color filter and a second color filter formed on the first substrate; a second substrate facing the first substrate and having a common electrode formed thereon; and a liquid crystal layer interposed between the first and second substrates, wherein the first and second color filters are spaced apart from each other in an intersection region of the first and second light blocking regions and are overlapped with each other in the second light blocking region other than the intersection region to form a color filter overlapped part in the vertical direction.