Drive IC Pad Design for COF and COG Compatibility
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Solution Overview
Problem
Existing drive integrated circuits (ICs) face challenges in being compatible with both chip on film (COF) and chip on glass (COG) types, requiring different designs due to variations in bump pitch and placement, which complicates their integration in display devices.
Innovation Solution
A drive IC design featuring input and output pad parts with specific diode and bump configurations, allowing for overlap and connection of diodes to manage electrostatic discharge and accommodate varying bump pitches, enabling compatibility with both COF and COG types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the source drive IC is designed with bumps disposed in all four sides (COF type), then all output bumps can be disposed without extending the length of the IC, but the design cannot be directly applied to COG type due to different bump pitch requirements
Solution Approach 1:
The drive IC is designed with a universal bump configuration where output bumps are disposed in the second direction (Y-axis) for both COF and COG types. The diode structure can serve different functions: in COF type, it protects against electrostatic discharge; in COG type, it prevents interference between power lines and data lines. This multi-functional design allows the same IC structure to be applied to both mounting types without requiring separate designs.
Solution Approach 2:
The patent applies different bump arrangements in different regions of the IC based on the mounting type. For COF type, bumps are disposed in all four sides with larger pitch. For COG type, bumps are disposed only in the first and second sides with smaller pitch. The diode configuration is optimized locally: in COF type, it provides ESD protection; in COG type, it prevents line interference. This localized optimization resolves the contradiction between adaptability and design complexity.
2Object-affected harmful factors
If the source drive IC is designed with bumps disposed only in the first and second sides (COG type), then interference between power lines and data lines is prevented, but the design cannot be directly applied to COF type due to larger bump pitch requirements
Solution Approach 1:
The patent employs a dynamic design approach where the functional role of the diode and bump configuration adapts based on the mounting type. The same physical structure serves different purposes: preventing line interference in COG type and providing ESD protection in COF type. This dynamic functionality allows the design to maintain adaptability across different mounting types while effectively addressing the harmful factor of line interference in each context.
3Reliability
If different designs are created for COF and COG types, then each type can be optimized for its specific requirements, but the overall design complexity and manufacturing complexity increase
Solution Approach 1:
The patent creates a universal drive IC design that can be manufactured once and used for both COF and COG types. The diode structure and bump configuration are designed to serve multiple functions depending on the mounting type, eliminating the need for separate manufacturing processes for different types. This universality reduces manufacturing complexity while maintaining the ability to optimize for specific type requirements through appropriate component selection and configuration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution allows for a unified drive IC design that can be applied to both COF and COG types, reducing design complexity and improving compatibility, while effectively managing electrostatic discharge and optimizing bump placement for efficient operation.
Implementation Method 1
A drive IC design featuring input and output pad parts with specific diode and bump configurations, allowing for overlap and connection of diodes to manage electrostatic discharge
Data Source
AI summary
Disclosed are a drive integrated circuit (IC) capable of being applied to all of a chip on film (COF) type and a chip on glass (COG) type and a display device including the drive IC. The drive IC includes an input pad part including a plurality of input bumps and an output pad part including a plurality of first diode parts, a plurality of second diode parts, and a plurality of output bumps. At least two of the plurality of output bumps overlap the plurality of first diode parts and the plurality of second diode parts, and a first output bump of the at least two output bumps is connected to at least one of the plurality of first diode parts and at least one of the plurality of second diode parts.