Point Symmetric Bond Pad Layout for Compact COG Display Mounting
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Solution Overview
Problem
Conventional chip-on-glass (COG) LCDs inefficiently utilize the contact ledge area, resulting in wasted space and a larger border or frame on the glass panel.
Innovation Solution
A display system with a pad configuration that includes point symmetric input and output bond pads for neighboring drivers, allowing effective utilization of the contact ledge area by aligning and sharing the flat flexible cable between drivers, thereby optimizing the mounting and signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional COG LCD mounting is used, then driver ICs can be mounted on contact ledge area, but the contact ledge area is not effectively utilized and some area is wasted
Solution Approach 1:
The patent applies asymmetry by configuring the bond pads in a point-symmetric pattern around the driver IC mounting position. Instead of conventional asymmetric pad layouts, the input and output bond pads are arranged symmetrically, allowing the flat flexible cable to be positioned optimally and fully utilize the available contact ledge area without waste.
Solution Approach 2:
The patent transitions from conventional single-sided or linear pad arrangements to a two-dimensional point-symmetric distribution of bond pads around the driver IC. This dimensional reorganization allows more efficient use of the contact ledge area by utilizing space in multiple directions rather than following a linear pattern.
2Length of moving object
If conventional COG LCD mounting is used, then driver ICs can be mounted on glass panel, but the border or frame of the glass panel becomes larger
Solution Approach 1:
By implementing point-symmetric bond pad configuration, the patent enables more compact driver IC mounting arrangements that reduce the required border area around the display panel, thereby increasing the effective display area relative to the overall panel size.
Solution Approach 2:
The patent merges the input and output bond pad functions into a unified point-symmetric configuration around the driver IC, consolidating the connection architecture to minimize the required border space and maximize the usable display area.
3Area of stationary object
If point symmetric bond pad configuration is used, then contact ledge area is effectively utilized, but the pad layout complexity increases
Solution Approach 1:
The point-symmetric bond pad configuration serves multiple functions simultaneously: it optimizes contact ledge area utilization, enables compact driver IC mounting, reduces border size, and provides a systematic layout that simplifies the flat flexible cable routing. This universal configuration approach manages complexity by creating a regular, predictable pattern.
Solution Approach 2:
The patent changes the geometric parameters of the bond pad arrangement from conventional asymmetric layouts to point-symmetric configurations. This parameter change creates a more efficient spatial distribution that maximizes area utilization while maintaining manufacturing feasibility through a systematic, repeatable pattern.
Data Source
AI summary
A pad configuration adaptable to a display system includes a plurality of input bond pads, via which a driver of the display system is mounted and signals are inputted to the driver; and a plurality of output bond pads, via which the driver is mounted and signals are outputted to a display panel of the display system. Input and output bond pads corresponding to one of two neighboring drivers are point symmetric with input and output bond pads corresponding to the other of the two neighboring drivers.