Tiled Display Power Connection via Exposed Bottom Line
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Solution Overview
Problem
In large-sized display devices, the increased number of pixels leads to a higher defect rate of light emitting elements, reducing productivity and reliability. Additionally, tiled display devices suffer from a sense of separation between adjacent display devices due to seams, which detracts from the immersion experience.
Innovation Solution
A display device configuration that includes a first substrate with a power bottom line, a second substrate with a power connection hole exposing the power bottom line, and a pixel driving unit with switching elements. The power connection holes are designed not to overlap with the pixel driving unit, and the device includes a heat dissipation layer and conductive adhesive to enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a large-sized display device is manufactured with increased number of pixels, then the display size is improved, but the defect rate of light emitting elements increases and productivity decreases
Solution Approach 1:
The display device is divided into multiple small display devices (tiles) that are connected together to form a large-sized display. Each tile contains a reduced number of pixels, which maintains lower defect rates while the collective arrangement achieves the desired large display size. This segmentation approach resolves the contradiction by distributing the pixel count across multiple independent units.
2Area of stationary object
If tiled display device is implemented to provide large screen, then the display size is improved, but seams between adjacent display devices create sense of separation
Solution Approach 1:
Adjacent display devices are positioned in close proximity with their connection holes aligned, and conductive adhesive is applied to electrically and physically connect them. The connection holes are designed to minimize visual disruption, and the overall arrangement merges multiple tiles into a unified large display that reduces the perceived separation effect.
3Reliability
If power connection holes are positioned on second substrate, then electrical connection is achieved, but overlap with pixel driving unit causes defects
Solution Approach 1:
The power connection holes are strategically positioned in specific regions of the second substrate where they do not overlap with the pixel driving unit. This localized placement ensures that electrical connections are established in safe zones, avoiding interference with pixel formation while maintaining reliable power delivery to the display elements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces the defect rate of light emitting elements, enhances productivity and reliability, and minimizes the sense of separation between display devices in tiled configurations, thereby improving the immersion experience.
Implementation Method 1
a conductive adhesive between the first power bottom line and the bump
Implementation Method 2
a heat dissipation layer under the first substrate, the heat dissipation layer including a metal material
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.