Rear-Side Connection Layout for Seamless Tiled Display Panels
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Solution Overview
Problem
Tiled display devices experience a sense of separation between adjacent display units due to seams, which reduces immersion and productivity, especially in large-sized displays where defect rates and reliability are compromised.
Innovation Solution
A display device design that minimizes the coupling area between units by positioning scan and source circuit boards on the rear surface, using conductive connection holes that do not overlap with pixel drivers, and applying power and data connections in a manner that prevents step differences and cracks, thus eliminating the visible seam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If display devices are connected to form a large screen, then the screen size is increased, but seams between adjacent display devices create a sense of separation that reduces immersion
Solution Approach 1:
The circuit boards and connection structures are extracted from the front surface to the rear surface of the display device. This removes the visible seam-causing elements from the display area, allowing multiple display devices to be connected without visible separation lines on the front surface, thereby maintaining immersion quality while achieving large screen size.
Solution Approach 2:
The connection structures are moved from the two-dimensional front surface plane to the three-dimensional rear surface space. By positioning circuit boards and connection holes on the rear surface, the invention utilizes the depth dimension to accommodate connection elements that would otherwise be visible on the front surface, eliminating seams while maintaining large display area.
2Reliability
If connection structures are placed on the front surface, then electrical connections between display devices are achieved, but visible seams and step differences are created
Solution Approach 1:
Connection structures including circuit boards and connection holes are relocated from the front surface to the rear surface of the display device. This spatial relocation maintains electrical connectivity while preserving the flatness and visual continuity of the front display surface, eliminating visible seams and step differences.
Solution Approach 2:
The rear surface serves as an intermediary space that accommodates all connection structures. By using the rear surface as a mediator for electrical connections, the invention separates the functional connection requirements from the visual display requirements, allowing both to coexist without conflict on the front surface.
3Reliability
If circuit boards are positioned on the front surface, then connectivity is achieved, but cracks and defects may occur due to stress concentration
Solution Approach 1:
Circuit boards and heavy connection structures are extracted from the front surface where they would create stress concentration points vulnerable to cracking. By relocating these elements to the rear surface, the structural integrity of the front display surface is maintained while electrical connectivity is preserved through the rear-surface connection architecture.
Data Source
AI summary
A display device comprises a first substrate, a first power bottom line on the first substrate, a second substrate on the first power bottom line, the second substrate having a first power connection hole to expose the first power bottom line, and a pixel driving unit including a plurality of switching elements on the second substrate.