Circular LCD Substrate with Linear Edges for Narrow Frame Width
Solution Overview
Problem
Liquid crystal display devices face an increase in size and complexity due to the expansion of the substrate's outer diameter, leading to a larger frame width and exterior size, as the resolution of display images increases and the number of traces within the display area grows.
Innovation Solution
The display device features a circular or ellipsoidal outer peripheral edge with linear edge portions, allowing for the reduction of the frame width by strategically arranging mounting components and data lines within the non-display area, optimizing the placement of scanning and data connection lines to minimize the non-display area and maintain a smaller frame size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of display images is enhanced and the number of traces within the display area is increased, then the display quality is improved, but the area where the terminals are formed is increased and the width of the flexible printed circuit board is increased
Solution Approach 1:
The patent transitions from a conventional rectangular substrate layout to a circular substrate layout, utilizing the radial dimension to arrange terminals and circuit boards. This dimensional change allows terminals to be distributed along the circumferential direction rather than being confined to a linear edge, reducing the required terminal formation area and flexible printed circuit board width while maintaining high display resolution
Solution Approach 2:
The patent divides the terminal formation area into multiple segments distributed around the circular substrate perimeter. Multiple flexible printed circuit boards are arranged at different angular positions, each handling a portion of the traces. This segmentation distributes the terminal load and reduces the width requirement for each individual circuit board while accommodating the increased trace count from high resolution
2Adaptability or versatility
If the area where the terminals are formed is increased and the width of the flexible printed circuit board connected to the area is increased, then the connection capability is improved, but the second area is also necessary to be increased and the largest outer diameter of the substrate is increased
Solution Approach 1:
The patent employs a circular substrate geometry where the peripheral edge extends in the circumferential direction, providing extended connection capability without increasing the radial outer diameter. The terminals are arranged along the circular perimeter, allowing multiple flexible printed circuit boards to connect at different angular positions, thus maintaining connection capability while controlling the substrate's maximum diameter
3Shape
If the liquid crystal display device has an outer shape as a whole following an outer shape of the substrate, then the shape matching is improved, but the frame width is necessarily increased and the exterior size is necessarily increased
Solution Approach 1:
The patent adopts a circular substrate and casing shape, utilizing curved geometry to achieve shape matching between the substrate and the overall device exterior. The circular form allows the flexible printed circuit boards to be arranged radially around the perimeter, enabling the casing to follow the circular contour with minimal frame width, thus maintaining shape matching while reducing exterior size compared to rectangular configurations
Data Source
AI summary
A liquid crystal display device (a display device) includes a liquid crystal panel (a display panel) having an outer peripheral edge portion having a substantially circular shape and including linear edge portions that are linear at a part of the outer peripheral edge portion, and flexible printed circuit boards (mounting components) mounted in an outer portion of the liquid crystal display panel to match arrangement of the linear edge portions in a circumferential direction.