Pixel Circuit Layout for Narrow-Bezel Micro-LED Displays
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Solution Overview
Problem
Current driving elements in display devices occupy significant frame space, hindering the development of narrow frame or frameless designs.
Innovation Solution
The display device design includes a substrate with scan lines and connection lines arranged in different directions, with semiconductor layers and pads positioned to accommodate light-emitting elements, allowing for centralized placement of driving circuits outside the display area, thereby reducing the frame width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If driving elements are disposed in the frame area at two sides of the circuit substrate, then electrical connectivity and reliability are maintained, but the frame width becomes considerable and narrow frame design is hindered
Solution Approach 1:
The patent moves the driving circuit from the frame area (2D plane at the sides) to the display area (utilizing the pixel circuit region), effectively changing the spatial dimension and location where driving elements are disposed. This allows the frame width to be reduced while maintaining electrical connectivity through the same functional elements now positioned within the display region.
2Area of stationary object
If driving elements are disposed in the frame area, then circuit functionality is ensured, but the frame occupies significant space making frameless design difficult
Solution Approach 1:
The patent merges the driving circuit functionality with the pixel circuit by disposing the driving circuit within the display area alongside the pixel circuits. This consolidation eliminates the need for separate frame area circuitry, maximizing the display area while integrating all necessary circuit functions into a unified layout within the display region.
3Length of stationary object
If driving circuit occupies frame space, then electrical connection is maintained, but narrow frame or frameless design cannot be achieved
Solution Approach 1:
The patent segments the circuit substrate design by dividing it into distinct functional regions: a display area containing both pixel circuits and driving circuit, and a frame area that can be minimized or eliminated. This segmentation allows independent optimization of each region, enabling narrow frame or frameless designs while maintaining manufacturability through standardized circuit fabrication processes.
Data Source
AI summary
A display device comprising a substrate, a scan line, a connection line, a semiconductor layer, a first pad, a second pad and a light emitting element. The scan line is disposed on the substrate. The connection line is electrically connected to the scan line. The semiconductor layer is disposed on the substrate and overlaps with the scan line. The first pad and the second pad are disposed on the substrate. The light emitting element is disposed on the first pad and the second pad, and is electrically connected to the semiconductor layer thought the first pad or the second pad. In a cross section view, the first pad has a first edge away from the second pad, the second pad has a second edge facing away the first pad, and a distance between the first edge and the second edge is longer than a width of the light emitting element.