Display Device Adhesive Layer Avoiding Circuit Board Roughness
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Solution Overview
Problem
Flat panel display devices, such as LCD and OLED devices, experience image quality degradation due to the roughness and high density of signal lines on the circuit board, which can cause wrinkles in the adhesive layer and affect image display.
Innovation Solution
The display device design includes a circuit board with specific areas of varying roughness and signal line density, where the adhesive layer is strategically positioned to avoid overlapping with high-roughness areas, and features holes or recesses to prevent wrinkles from propagating to the display panel, ensuring improved image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the circuit board has high signal line density and rough surface in certain areas, then the electrical connection performance is improved, but the adhesive layer develops wrinkles and image quality degrades
Solution Approach 1:
The adhesive layer is designed to exclude or avoid overlapping with the high-roughness first area of the circuit board. By extracting the adhesive layer from the problematic high-density signal line region, the harmful effect of wrinkles is eliminated while maintaining electrical connection performance in the high-roughness area.
Solution Approach 2:
The circuit board is designed with different surface roughness characteristics in different areas: a first area with higher roughness for improved electrical connection, and a second area with lower roughness for adhesive layer placement. This local differentiation allows each area to optimize its specific function without compromising the other.
2Area of stationary object
If the adhesive layer overlaps the high-roughness area of the circuit board, then the bonding coverage is maximized, but wrinkles form and propagate to the display panel
Solution Approach 1:
The adhesive layer is strategically positioned to be excluded from the high-roughness first area, thereby extracting or removing the source of wrinkle formation from the adhesive bonding region. This ensures that the adhesive layer only contacts the smooth second area, preventing wrinkle generation while maintaining adequate bonding coverage.
3Ease of manufacture
If the circuit board uses uniform roughness across all areas, then the manufacturing process is simplified, but image quality degradation occurs due to adhesive layer wrinkles
Solution Approach 1:
The circuit board is designed with spatially varying surface roughness: a first area with higher roughness for electrical connection optimization and a second area with lower roughness for adhesive layer placement. This local quality differentiation resolves the contradiction by allowing manufacturing complexity only where necessary for performance, while maintaining simplicity in the adhesive bonding region.
Data Source
AI summary
A display device includes: a display panel; a circuit board disposed on a lower surface of the display panel; and an adhesive layer disposed between the circuit board and the lower surface of the display panel. An area of the circuit board that has a roughness higher than a predetermined reference roughness does not overlap the adhesive layer.