Liquid Crystal Display Panel with Recessed CF Substrate
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Solution Overview
Problem
Conventional liquid crystal display panels suffer from poor strength and durability due to size discrepancies between TFT and CF substrates, leading to warping, peeling, cracking, and display defects under external stress.
Innovation Solution
A liquid crystal display panel design featuring a recessed shape on the CF substrate with a sealing material aligned along its shape, overlapping with the TFT substrate at corners and sides, and a flexible printed circuit board connected to non-overlapping regions, ensuring no gaps and improved substrate protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the TFT substrate is made larger to accommodate driver chip and FPC mounting areas, then the mounting functionality is improved, but the substrate strength deteriorates due to the one-sheet-substrate structure without overlapping support
Solution Approach 1:
The invention transitions from a single-plane substrate structure to a multi-layer overlapping structure. The CF substrate is positioned to overlap with the TFT substrate at corner regions, creating a three-dimensional structural arrangement that provides mechanical support to the extended TFT substrate areas where driver chips and FPCs are mounted.
Solution Approach 2:
The CF substrate is nested within the boundary of the TFT substrate, with specific corner portions of the CF substrate overlapping the TFT substrate. This nested arrangement allows the smaller CF substrate to provide structural reinforcement to the specific regions of the larger TFT substrate that require strength, while still accommodating the extended mounting areas.
2Volume of moving object
If the CF substrate is made smaller to reduce overall module size, then the device compactness is improved, but the substrate durability deteriorates due to insufficient overlapping support at corner regions
Solution Approach 1:
Instead of uniformly increasing the CF substrate size, the invention applies local quality by strategically positioning only the corner portions of the CF substrate to overlap with the TFT substrate. This localized overlapping provides targeted mechanical support exactly where needed (at the corner regions) without unnecessarily increasing the overall substrate size or volume.
3Ease of manufacture
If the sealing material is applied in a conventional rectangular pattern, then the manufacturing simplicity is maintained, but the substrate protection deteriorates due to gaps in corner regions
Solution Approach 1:
The sealing material application is segmented into two distinct regions: a first sealing material applied along the peripheral edge in a conventional manner, and a second sealing material specifically applied to fill the corner gaps where the TFT and CF substrates overlap. This segmentation allows each sealing material to address specific protection needs while maintaining overall manufacturing feasibility.
Data Source
AI summary
The present invention provides a liquid crystal display panel which exhibits excellent durability by protecting portions of a substrate which are liable to be most easily cracked or chipped. In a liquid crystal display panel arranging a sealing material between a TFT substrate and a CF substrate, and holding a liquid crystal layer between the TFT substrate and the CF substrate, the CF substrate has one-side surface thereof formed in a recessed shape as viewed from above, a flexible printed circuit board is connected to a region of the TFT substrate where the CF substrate and the TFT substrate do not overlap with each other, and a sealing material is formed along a shape of the CF substrate. Portions where the TFT substrate and the CF substrate overlap with each other and correspond to both sides of the portion where the flexible printed circuit board is arranged can be formed such that the sealing material is filled in the portions with no gap.