LCD Panel Seal with Conductive Particles for Common Electrode Connection
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Solution Overview
Problem
The complex process of applying a transfer pad or Au in sealant on the common electrode (Vcom) in liquid crystal display devices is difficult, especially when using general seal coating techniques, which require equal voltage levels and independent, closed pattern designs.
Innovation Solution
A panel manufacture method involving the formation of adjacent substrate pairs with symmetrically distributed common electrodes, where one seal is coated with conductive particles to cover the common electrodes, while the other seal is not, allowing for efficient sealing and conductivity between substrates without the need for additional transfer pads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Au in sealant or additional transfer pad is used to connect common electrode Vcom in upper and lower substrates, then conductivity between substrates is achieved, but processing complexity increases and voltage level restrictions are imposed
Solution Approach 1:
The patent merges the sealing function and the common electrode connection function into a single seal structure. The seal contains both non-conductive material for sealing and conductive material (Au particles) for electrical connection, eliminating the need for separate transfer pads and simplifying the manufacturing process.
Solution Approach 2:
The seal structure is designed to perform multiple functions simultaneously: it provides mechanical sealing to contain the liquid crystal and enables electrical connection between the common electrodes of upper and lower substrates. This multi-functional design reduces the number of components and processing steps.
2Reliability
If Au in sealant is used, then common electrode connection is achieved, but equal voltage level restriction is imposed on coated area
Solution Approach 1:
The seal is designed with non-uniform conductivity distribution. Only specific regions of the seal contain conductive Au particles for electrical connection, while other regions remain non-conductive for pure sealing function. This local differentiation allows voltage flexibility in non-conductive areas while maintaining reliable connection where needed.
3Reliability
If seal is designed as independent and closed pattern, then sealing effectiveness is ensured, but application of transfer pad or Au in sealant on Vcom becomes difficult
Solution Approach 1:
The conductive Au particles are pre-mixed into the seal material before coating. This preliminary incorporation of conductive material eliminates the need for subsequent complex processes of applying transfer pads or adding Au to the sealant, as the conductivity is built-in from the start.
Solution Approach 2:
The seal material is formulated as a composite containing both non-conductive sealing matrix and conductive Au particles. This composite structure allows the seal to maintain its closed pattern for effective sealing while incorporating conductivity where needed, simplifying the manufacturing process.
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
This method simplifies the coating process, reduces complexity, and ensures effective conductivity between common electrodes of upper and lower substrates, while maintaining a general seal for non-electrode areas, thereby avoiding the challenges of traditional techniques.
Implementation Method 1
boxing the adjacent substrate pair and filter substrate pair so that conductive particles conducting common electrodes of adjacent substrate pair and filter substrate pair
Data Source
AI summary
The present invention provides a panel and panel manufacture method, including: completing thin film transistor array and common electrode on glass substrate, forming adjacent substrate pair, adjacent substrate pair including first substrate and second substrate connected by adjacent line, common electrodes on first substrate and second substrate symmetrically distributed with respect to adjacent line; coating a first seal on peripheral area of adjacent substrate pair, coating a second seal along adjacent sides of first substrate and second substrate, second seal and first seal being partially overlapping, at least one of first seal and second seal including conductive particles; boxing adjacent substrate pair and filter substrate pair so that conductive particles conducting common electrodes of adjacent substrate pair and filter substrate pair; cutting adjacent substrate pair and filter substrate pair along adjacent lines to form panel. The present invention also provides a liquid crystal display panel.