TFT Substrate Recess for Flexible Wiring Nesting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional liquid crystal display devices face challenges in reducing physical size while maintaining screen size and ensuring reliable connection of flexible wiring substrates, which are prone to separation due to external forces and require increased mold size for accommodation.
Innovation Solution
A liquid crystal display device design featuring a recessed terminal portion on the TFT substrate for connecting flexible wiring substrates, allowing them to be bent over the rear side and accommodated within the mold, reducing physical size and enhancing connection reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the flexible wiring substrate is bent backward to cover one side of the mold, then the display device can be made compact, but the physical size of the mold must be increased and the connection reliability deteriorates
Solution Approach 1:
The flexible wiring substrate is nested within the recessed portion of the TFT substrate, allowing the substrate to be bent backward without increasing the overall mold size. The recessed portion accommodates the bent substrate, creating a compact structure while maintaining connection reliability through proper nesting of components.
Solution Approach 2:
A recessed portion is created at a specific location (side edge) of the TFT substrate to accommodate the bent flexible wiring substrate. This local structural modification allows the substrate to be bent without affecting the overall integrity or increasing the mold size, while maintaining reliable electrical connection through the anisotropic conductive film.
2Area of stationary object
If the flexible wiring substrate is bent backward, then space is saved, but external forces can cause separation from the TFT substrate
Solution Approach 1:
The flexible wiring substrate is nested within the recessed portion of the TFT substrate, which provides mechanical support and protection. This nesting structure prevents the substrate from being easily separated by external forces while maintaining a compact mold area.
Solution Approach 2:
The recessed portion is designed in advance to accommodate the bent flexible wiring substrate, providing structural support and protection against external forces before they can cause separation. This preemptive structural design strengthens the connection.
3Volume of moving object
If the terminal portion is formed at the side edge with a recessed portion, then the flexible wiring substrate can be accommodated without increasing mold size, but the manufacturing complexity increases
Solution Approach 1:
The recessed portion is formed at the side edge of the TFT substrate to nest the bent flexible wiring substrate. This approach accommodates the substrate within the existing mold volume without requiring additional mold space, though it does add a manufacturing step for creating the recessed portion.
Data Source
AI summary
An object of the invention is to reduce the size of a liquid crystal display device and to enhance the reliability of a connection portion with a flexible wiring substrate. According to the invention, liquid crystal is sandwiched between a TFT substrate and a color filter substrate. The TFT substrate is formed in a larger size than that of the color filter substrate. A connection portion with a flexible wiring substrate is formed on the TFT substrate. The TFT substrate is formed with a notch at its portion connected with the flexible wiring substrate. The flexible wiring substrate is bent over the notch toward a rear side of the liquid crystal display device as accommodated in a mold. This allows for the size reduction of the overall display device and ensures the enhanced reliability of the connection portion.