Chip-on-Film Package Structure for Narrow Bezel Bending
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Solution Overview
Problem
Chip-on-film (COF) packages face challenges in minimizing bezel length and reducing the risk of display panel detachment, while ensuring safe handling and assembly, due to limitations in film thickness and elasticity.
Innovation Solution
A COF package design featuring a film with a reinforcement area, bending area, and chip mounting area, utilizing conductive patterns and insulating layers with varying elastic moduli to support the chip and facilitate bending without penetrating the film, thereby reducing detachment risks and enabling safe handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the film thickness is reduced to enable bending and reduce bezel length, then the flexibility and bezel length are improved, but the risk of display panel detachment and handling safety deteriorates
Solution Approach 1:
The patent applies local quality by creating distinct regions within the film structure: a reinforcement area with higher elastic modulus (first insulating layer) and a bending area with lower elastic modulus (second insulating layer). This spatial differentiation of material properties allows the film to simultaneously provide structural support where needed and flexibility where required, resolving the contradiction between reduced bezel length and prevention of display panel detachment.
Solution Approach 2:
The patent uses composite materials by combining multiple insulating layers with different elastic moduli on the film substrate. The first insulating layer (higher elastic modulus) provides reinforcement in the reinforcement area, while the second insulating layer (lower elastic modulus) enables bending in the bending area. This composite structure allows the thin film to maintain both strength and flexibility, preventing detachment while enabling reduced bezel length.
2Adaptability or versatility
If the film thickness is reduced to improve flexibility and reduce bezel length, then the adaptability is improved, but the ease of operation and handling safety deteriorates
Solution Approach 1:
The patent applies local quality by creating distinct regions within the film structure: a reinforcement area with higher elastic modulus (first insulating layer) and a bending area with lower elastic modulus (second insulating layer). This spatial differentiation of material properties allows the film to simultaneously provide structural support where needed and flexibility where required, resolving the contradiction between reduced bezel length and prevention of display panel detachment.
Solution Approach 2:
The patent uses composite materials by combining multiple insulating layers with different elastic moduli on the film substrate. The first insulating layer (higher elastic modulus) provides reinforcement in the reinforcement area, while the second insulating layer (lower elastic modulus) enables bending in the bending area. This composite structure allows the thin film to maintain both strength and flexibility, preventing detachment while enabling reduced bezel length.
3Device complexity
If a single insulating layer is used, then the device complexity is reduced, but the ability to simultaneously provide reinforcement and flexibility deteriorates
Solution Approach 1:
The patent applies local quality by creating distinct regions within the film structure: a reinforcement area with higher elastic modulus (first insulating layer) and a bending area with lower elastic modulus (second insulating layer). This spatial differentiation of material properties allows the film to simultaneously provide structural support where needed and flexibility where required, resolving the contradiction between reduced bezel length and prevention of display panel detachment.
Solution Approach 2:
The patent uses composite materials by combining multiple insulating layers with different elastic moduli on the film substrate. The first insulating layer (higher elastic modulus) provides reinforcement in the reinforcement area, while the second insulating layer (lower elastic modulus) enables bending in the bending area. This composite structure allows the thin film to maintain both strength and flexibility, preventing detachment while enabling reduced bezel length.
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 design achieves a reduced bezel length, enhances the safety and reliability of handling and assembly, and prevents display panel detachment by optimizing film thickness and elasticity, improving the overall performance and reliability of the COF package.
Implementation Method 1
a first insulating layer having a first elastic modulus and extending over the conductive pattern layer in the reinforcement area, and a second insulating layer having a second elastic modulus and extending over the conductive pattern layer in the bending area, wherein the first elastic modulus is greater than the second elastic modulus
Implementation Method 2
a first insulating layer having a first elastic modulus and extending over the conductive pattern layer in the reinforcement area, and a second insulating layer having a second elastic modulus and extending over the conductive pattern layer in the bending area, wherein the first elastic modulus is greater than the second elastic modulus
Data Source
AI summary
A chip-on-film (COF) package includes a film including a reinforcement area, a bending area and a chip mounting area, a conductive pattern layer disposed on the film in the reinforcement area and in the bending area, and at least partially in the chip mounting area, a chip mounted on a portion of the conductive pattern layer in the chip mounting area, a first insulating layer having a first elastic modulus and extending over the conductive pattern layer in the reinforcement area, and a second insulating layer having a second elastic modulus and extending over the conductive pattern layer in the bending area, wherein the first elastic modulus is greater than the second elastic modulus, and the film is intact in the chip mounting area.