Display Circuit Layout for Irregular Corner Dead Space Reduction
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Solution Overview
Problem
In organic light emitting display devices, the non-display areas adjacent to the display area, which house driving circuits, often result in dead space due to irregularly shaped display areas, leading to inefficient use of space and potential short-circuit issues when driving circuits overlap.
Innovation Solution
The display device optimizes the layout of driving circuits by using different conductive layers for various components, such as the demultiplexing circuit unit and scan transmission line, and strategically positions them adjacent to the display area's irregular corners, ensuring they do not overlap and minimizing dead space through careful layering and insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If driving circuits are placed in non-display areas adjacent to irregularly shaped display areas, then the display device can function properly, but dead space increases and space utilization becomes inefficient
Solution Approach 1:
The patent utilizes multiple conductive layers (first through fifth conductive layers) to vertically separate different circuit components. The demultiplexing circuit unit and scan transmission line are placed in different layers, allowing them to overlap in the plan view without electrical interference, thus reducing dead space while maintaining functional reliability.
2Area of stationary object
If driving circuits are positioned to minimize dead space in irregularly shaped displays, then space utilization improves, but short-circuit issues may occur due to overlapping circuits
Solution Approach 1:
The patent resolves the short-circuit risk by placing overlapping circuit elements in different conductive layers. The scan transmission line and demultiplexing circuit unit overlap in the plan view to minimize dead space, but are separated vertically by insulating layers, preventing electrical short-circuits while achieving compact layout.
Solution Approach 2:
Insulating layers are introduced as intermediary elements between the scan transmission line and demultiplexing circuit unit. These insulating layers act as mediators that allow the circuits to be positioned close together or overlap in the plan view while preventing direct electrical contact, thus enabling compact layout without short-circuit risks.
3Reliability
If different conductive layers are used for demultiplexing circuit unit and scan transmission line, then short-circuit prevention is achieved, but device complexity increases
Solution Approach 1:
The patent segments the circuit components into different conductive layers (first through fifth conductive layers). The scan transmission line is formed in one layer while the demultiplexing circuit unit is formed in another layer, with insulating layers between them. This segmentation prevents short-circuits while distributing the complexity across multiple standardized layers that can be manufactured using conventional multi-layer PCB or thin-film techniques.
Data Source
AI summary
A display device, includes: a display area including an upper side, a lower side, a left side, a right side, and inclined corner portions where the upper, lower, left, and right sides meet; a demultiplexing circuit unit adjacent to the lower side of the display area and the corner portion connected thereto; and a scan transmission line which extends toward the display area from an outer side of the left side and overlaps with the demultiplexing circuit unit outside the corner portion, wherein the demultiplexing circuit unit includes a demultiplexer transistor, and the scan transmission line is formed of a different conductive layer from an electrode of a demultiplexer transistor.