Concave Base Layer Storage Capacitor for Flexible Displays
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Solution Overview
Problem
The existing display devices face challenges in efficiently disposing storage capacitors due to space limitations, which restrict the design and process of pixel circuits, especially in flexible and foldable display devices where stress and deformation can affect capacitance and operational performance.
Innovation Solution
The implementation of a concave portion in the base layer to house the storage capacitor electrodes, with facing surfaces extending along different planes, allowing for a larger capacitance without increasing the horizontal area, and the use of a well portion in the storage capacitor to minimize stress and deformation in flexible displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the storage capacitor is disposed on a flat base layer surface, then the capacitor can be easily manufactured, but the area required for the capacitor increases, limiting pixel circuit design
Solution Approach 1:
The patent transitions from a two-dimensional flat surface arrangement to a three-dimensional structure by forming a concave portion in the base layer. The capacitor electrodes are disposed within this concave region, utilizing the vertical dimension to achieve higher capacitance density without increasing the horizontal footprint on the substrate.
Solution Approach 2:
The capacitor electrodes are nested within the concave portion of the base layer, effectively placing one structure (capacitor) inside another (concave region). This nesting approach maximizes the use of available space by utilizing the volume created by the concave geometry rather than occupying additional planar area.
2Length of stationary object
If the base layer is made thin to reduce device thickness, then the overall device becomes more compact, but stress and deformation in flexible displays increase, affecting capacitance
Solution Approach 1:
The patent applies different structural qualities to different regions of the base layer. The concave portion is formed locally at the capacitor position, creating a region with enhanced mechanical support and stress distribution. This localized structural modification allows the rest of the base layer to remain thin while the capacitor region maintains structural integrity under flexing conditions.
Solution Approach 2:
The concave portion structure acts as a pre-designed stress relief mechanism. By creating this geometric feature beforehand, the structure is prepared to accommodate and distribute stresses that will occur during flexible display operation, preventing deformation of the capacitor electrodes before stress occurs.
3Quantity of substance
If the capacitor area is increased to achieve sufficient capacitance, then the capacitance value is adequate, but the non-display region increases, reducing display area
Solution Approach 1:
The patent achieves higher capacitance by exploiting the third dimension (depth) through the concave portion structure. Instead of increasing the horizontal area of the capacitor electrodes, the design increases the effective capacitance-forming volume by allowing electrodes to extend vertically within the concave region, thereby maintaining high capacitance with minimal planar footprint.
Solution Approach 2:
The patent changes the geometric parameters of the capacitor structure by introducing depth (via the concave portion) as an additional dimension for capacitance enhancement. This parameter change allows the capacitance to be increased without proportionally increasing the area, as the capacitance now benefits from both area and depth contributions.
Data Source
AI summary
According to an embodiment of the disclosure, a display device includes a pixel circuit layer including a base layer and a pixel circuit disposed on the base layer, and a light emitting element disposed on the base layer and electrically connected to the pixel circuit. The pixel circuit includes a transistor and a storage capacitor including a first capacitor electrode and a second capacitor electrode. The base layer includes a concave portion. At least a portion of each of the first capacitor electrode and the second capacitor electrode is disposed in the concave portion.