Liquid Crystal Display Dual Spacer Light Shielding Integration
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Solution Overview
Problem
The existing liquid crystal display devices with the double scanning line system face challenges in achieving low cost, high quality, and high pixel aperture ratio while maintaining high display quality across a wide operating temperature range, due to issues like light leakage and alignment defects caused by columnar spacers, and high manufacturing costs associated with dual spacer structures.
Innovation Solution
The liquid crystal display device incorporates a dual spacer structure with main and sub-spacers of the same thickness, disposed at the intersections of lattice-shaped light shielding patterns, which maintain the substrate interval and prevent light leakage by integrating the spacers into the light shielding region, thereby reducing manufacturing complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If columnar spacers are disposed in the light shielding region to control substrate interval, then the distance between substrates is maintained, but light leakage is generated and display quality deteriorates
Solution Approach 1:
The patent merges the columnar spacer with the light shielding layer by forming the spacer within the light shielding region boundaries. The light shielding layer surrounds the columnar spacer, combining the spacer function with the light shielding function to prevent light leakage while maintaining substrate interval control.
Solution Approach 2:
The patent introduces an intermediary structure where the light shielding layer acts as a mediator between the columnar spacer and the surrounding regions. This intermediary structure prevents light from leaking around the spacer while allowing the spacer to fulfill its substrate interval control function.
2Reliability
If dual spacer structure is used to ensure reliability across wide temperature range, then temperature stability is improved, but manufacturing cost increases
Solution Approach 1:
The patent segments the spacer function into two parts: columnar spacers for substrate interval control and a planarization layer for surface flatness. This segmentation allows each component to perform its specific function independently, simplifying manufacturing while maintaining temperature stability.
Solution Approach 2:
The patent makes the columnar spacer serve multiple functions: it controls substrate interval, provides structural support, and when combined with the light shielding layer, prevents light leakage. This multi-functionality reduces the need for additional separate components, thereby reducing manufacturing cost while maintaining reliability.
3Manufacturing precision
If columnar spacer is disposed near TFT to planarize surface, then surface flatness is improved, but alignment processing is disturbed and light leakage increases
Solution Approach 1:
The patent extracts the alignment processing function from the region near the columnar spacer by defining a specific alignment region that excludes the spacer area. This allows the spacer to perform its planarization function without interfering with the alignment process in the designated alignment region.
Solution Approach 2:
The patent applies local quality by creating a specialized alignment region with specific properties that are different from the region containing the columnar spacer. The alignment region is defined by the light shielding layer boundaries, creating a localized area optimized for alignment processing while the spacer region maintains its structural function.
4Ease of manufacture
If video signal lines are reduced to halve the number of driving IC chips, then manufacturing cost is reduced, but inter-pixel regions are generated where video signal lines are not provided
Solution Approach 1:
The patent merges the video signal line function with the light shielding layer by positioning the light shielding layer to extend into the inter-pixel region where video signal lines are not provided. This merging allows the light shielding layer to compensate for the reduced video signal line coverage, maintaining display quality while reducing the number of driving IC chips.
Data Source
AI summary
A liquid crystal display device according to the present invention includes an array substrate and a CF substrate. The CF substrate includes a lattice-shaped light shielding pattern between pixel electrodes and a columnar spacer at an intersection of the light shielding patterns. The array substrate and the CF substrate are disposed so as to face each other with a liquid crystal layer interposed therebetween. The intersection includes a portion in which signal lines intersect each other and a portion in which the signal lines do not intersect each other, whereby a step is provided on a surface of the array substrate. The columnar spacer includes a main spacer in the portion in which the signal lines intersect each other and a sub-spacer in the portion in which the signal lines do not intersect each other.