Display Device Stacked Body Sludge Layer Control
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Solution Overview
Problem
The existing methods for attaching a circuit board to the lateral side of a display panel often result in the formation of a sludge layer during the grinding process, which affects the reliability of the display device due to inconsistent contact resistance and reduced reliability.
Innovation Solution
A display device design that includes a color filter stacked body with at least two color filters on the outermost edge of the non-display area, along with a column spacer and conductive layers, to control the formation and prevent the sludge layer, ensuring stable contact resistance and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the lateral side of the display panel is ground to attach the circuit board, then the circuit board can be bonded to the lateral side, but a sludge layer is formed during the grinding process which causes inconsistent contact resistance and reduced reliability
Solution Approach 1:
The stacked body is formed on the outermost edge of the non-display area before the grinding process. This preliminary structure prevents sludge layer formation during subsequent grinding by providing a controlled interface between the display panel and circuit board, thereby maintaining consistent contact resistance while enabling circuit board attachment.
Solution Approach 2:
The stacked body acts as an intermediary structure between the display panel and the circuit board. It includes a pad portion that contacts the gate conductive layer and data conductive layer, providing a stable electrical connection interface that prevents sludge layer formation and ensures reliable signal transmission.
2Device complexity
If the stacked body is disposed close to the sealant, then the structure is more compact, but the sludge layer formation cannot be controlled effectively
Solution Approach 1:
The stacked body is disposed at a specific location spaced apart from the sealant by a predetermined distance. This localized positioning creates an optimal balance between structural compactness and sludge layer control, allowing the pad portion to make reliable contact with the conductive layers while preventing sludge accumulation in critical areas.
3Device complexity
If the color filter stacked body uses a single color filter layer, then the manufacturing process is simpler, but the sludge layer formation is not effectively prevented
Solution Approach 1:
The invention transitions from a single color filter layer to a stacked body structure comprising multiple color filter layers (at least two different colors). This dimensional change in the color filter structure provides better sludge layer prevention capability while maintaining manufacturing feasibility through sequential layer formation.
Data Source
AI summary
A display device according to an exemplary embodiment of the present inventive concept includes: a first substrate including a display area and a non-display area; a second substrate overlapping the first substrate; a sealant disposed between the first substrate and the second substrate; and a stacked body disposed between the first substrate and the second substrate, disposed on an outermost edge of the non-display area, and disposed spaced apart from the sealant, wherein the stacked body includes a column spacer and a color filter stacked body in which at least two color filters are stacked.