Display Device Protrusion Spacer Cell Gap Control
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Solution Overview
Problem
Existing transparent display devices face challenges in maintaining a consistent cell gap between substrates, leading to variations in display quality due to unevenness on the substrate surfaces, which affects transmittance and pixel performance.
Innovation Solution
A display device structure featuring a protrusion part in the planarization film that functions as a spacer to maintain the cell gap between substrates, reducing variations and improving transmittance, while also allowing for the release of moisture to prevent transistor degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional spacer arrangement is used at wiring intersections, then the aperture ratio is maintained, but the cell gap becomes uneven due to substrate surface irregularities
Solution Approach 1:
The invention transitions from a planar spacer arrangement to a three-dimensional protrusion structure extending from the planarization film into the liquid crystal layer, creating a new spatial dimension for gap control that directly addresses substrate surface irregularities
Solution Approach 2:
The protrusion structures are selectively formed only in regions where cell gap uniformity needs improvement, while other regions maintain their conventional structure, allowing localized correction without global structural changes
2Manufacturing precision
If the cell gap is reduced for higher pixel density, then the display resolution improves, but moisture accumulation accelerates transistor degradation
Solution Approach 1:
The protrusion structures serve as intermediary elements that extend into the liquid crystal layer to create moisture release pathways, mediating between the confined cell gap environment and moisture accumulation prevention
Solution Approach 2:
The protrusion structures create a porous or channel-like structure within the cell gap that facilitates moisture migration and release, preventing moisture accumulation that would otherwise accelerate transistor degradation
3Illumination intensity
If the aperture ratio is increased for brighter display, then the transmittance improves, but the cell gap control becomes more difficult
Solution Approach 1:
The cell gap control function is segmented from the general substrate structure and assigned to discrete protrusion structures, allowing independent optimization of aperture ratio and gap control without mutual interference
Data Source
AI summary
A display device includes a first conductive layer arranged on a first substrate and extending in a first direction, a first insulating film arranged on the first conductive layer, a second conductive layer arranged on the first insulating film and extending in a second direction intersecting the first direction, a second insulating film arranged on the second conductive layer and extending in the first direction and the second direction, a transparent conductive layer arranged on the second insulating film and extending in the first direction and the second direction, a third insulating film arranged on the first conductive layer, and a second substrate opposing the first substrate.