Pixel Circuit Layout With Relay Wiring for Narrow-Bezel Displays
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Solution Overview
Problem
Existing display technologies face challenges in increasing the size of display devices while minimizing the frame size, particularly due to the overlap of display elements with driver circuits, which hinders the development of high-resolution and large-sized displays.
Innovation Solution
The display device design includes a matrix arrangement of pixels and scanning-line driver circuits where pixel circuits do not overlap the driver circuits, with a relay wiring connecting the pixel circuits to light-emitting elements, and employs a switching transistor to manage current supply efficiently, reducing the load on driver circuits and preventing display delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If display elements are arranged in the frame region where driver circuits are provided, then the frame size is narrowed, but the driver circuits and display elements overlap causing signal delays and display defects
Solution Approach 1:
The pixel circuit is divided into two separate parts: a first pixel circuit located in the non-frame region and a second pixel circuit located in the frame region. The light-emitting element is electrically connected to both circuits through relay wirings, allowing the second pixel circuit to be positioned near the scanning-line driver circuit without causing signal interference, thus narrowing the frame while maintaining signal reliability.
Solution Approach 2:
Relay wirings serve as intermediary connection paths between the light-emitting element and the pixel circuits. These relay wirings allow electrical connection while enabling spatial separation between the pixel circuit and the scanning-line driver circuit, preventing direct overlap and signal interference while still achieving compact frame design.
2Device complexity
If pixel circuits are positioned close to scanning-line driver circuits to reduce relay wiring length, then manufacturing complexity increases due to overlap constraints
Solution Approach 1:
The pixel circuit is segmented into first and second portions positioned in different regions (non-frame and frame regions respectively). This segmentation allows each portion to be optimized for its location: the first portion maintains clean separation from driver circuits for ease of manufacturing, while the second portion benefits from proximity to reduce relay wiring length.
Solution Approach 2:
The solution moves from a single-plane arrangement to a multi-dimensional distribution of pixel circuit components. By splitting the pixel circuit across different spatial regions and using relay wirings to connect them, the design achieves compactness without compromising manufacturability.
Data Source
AI summary
A display device includes a plurality of pixels and at least one scanning-line driver circuit. The plurality of pixels each includes a light-emitting element and a pixel circuit electrically connected to the light-emitting element. The scanning-line driver circuit is electrically connected to the plurality of pixels. The pixel circuits each do not overlap the scanning-line driver circuit. A display region partly overlaps the scanning-line driver circuit. The pixel circuits are arranged in a matrix form having a plurality of rows and a plurality of columns. The pixel circuits each include a driving transistor configured to supply a current to the light-emitting element and a switching transistor configured to supply the current from the driving transistor to the light-emitting element. The switching transistor and the light-emitting element are electrically connected to each other through a relay wiring in each pixel.