Display Device Circuit Board Moisture Protection via Spacer Gap
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Solution Overview
Problem
The existing TAB mounting method for connecting a circuit board to a display panel is prone to damage from moisture, which can seep into the circuit board and cause damage, especially when cleaning agents are used on the display surface.
Innovation Solution
The display device incorporates spacers and a protection member on the non-display area of the first display substrate, with the spacers spaced apart to create a gap that the connection circuit board faces, and a protection member covering the connection circuit board, which reduces moisture introduction and protects the circuit board from damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the TAB mounting method is used to connect the circuit board to the display panel, then the circuit board can be bonded to the display panel using an anisotropic conductive film, but moisture can seep into the circuit board and cause damage
Solution Approach 1:
A protrusion is added to the circuit board that protrudes from the bonding surface toward the display surface. This protrusion acts as an intermediary barrier that prevents moisture which has seeped under the display panel from reaching the circuit board, thus resolving the contradiction between easy manufacturing via TAB mounting and protection against moisture damage.
Solution Approach 2:
The circuit board is segmented by adding a protrusion that divides the bonding surface into different regions. This segmentation creates a physical barrier that blocks moisture pathways while maintaining the overall bonding functionality, allowing the circuit board to remain connected while protected from moisture.
2Object-affected harmful factors
If spacers are added to create a gap for moisture barrier, then moisture protection is improved, but device complexity increases
Solution Approach 1:
The moisture barrier function is merged with the existing circuit board structure by adding a protrusion that is integrated into the circuit board itself. This eliminates the need for separate spacer components, thus improving moisture protection while avoiding increased device complexity.
Solution Approach 2:
The protrusion on the circuit board serves multiple functions: it maintains the bonding connection through the anisotropic conductive film and simultaneously acts as a moisture barrier. This multi-functionality improves moisture protection without adding dedicated protective components that would increase complexity.
Data Source
AI summary
A display device includes a first display substrate including a display area and a non-display area, a second display substrate facing the first display substrate and including an end portion corresponding to the non-display area and extending along a first direction; a connection circuit board connected to the first display substrate at the non-display area thereof and disposed adjacent to the end portion of the second display substrate; and a first spacer and a second spacer each on the end portion of the second display substrate, and spaced apart from each other along the first direction to define a space therebetween. Along a second direction which crosses the first direction, a central portion of the connection circuit board connected to the first display substrate faces the space between the first spacer and the second spacer on the second display substrate.