Double-Sided Display Layout for Wider Light-Emitting Regions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing double-sided display devices face challenges in securing a sufficient light-emitting region due to the need for multiple contact holes for connecting top and bottom emission light-emitting elements to their respective drive circuits, which narrows the available space for light-emitting regions.
Innovation Solution
The display device design includes a substrate with a flattened layer, where top emission elements are provided in openings of the flattened layer and bottom emission elements are above it, with their drive circuits closer to the substrate, allowing light emission in opposite directions and reducing the need for extensive contact holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both top emission and bottom emission light-emitting elements are provided on the flattened layer, then double-sided display functionality is achieved, but the light-emitting region is narrowed due to the need for multiple contact holes
Solution Approach 1:
The patent moves the drive circuits from the flattened layer to the substrate layer, utilizing the vertical dimension to resolve the space conflict. This allows contact holes to be formed only in the flattened layer for the light-emitting elements, while drive circuits occupy the substrate layer, thereby expanding the available area for light-emitting regions without compromising double-sided display functionality
Solution Approach 2:
The patent segments the device into distinct functional layers: the substrate layer contains drive circuits and first contact holes, while the flattened layer contains light-emitting elements and second contact holes. This segmentation allows each layer to be optimized independently, with the flattened layer maximizing light-emitting area and the substrate layer accommodating circuitry
2Reliability
If multiple contact holes are formed in the flattened layer for connecting light-emitting elements to drive circuits, then electrical connectivity is achieved, but the region available for light-emitting elements is reduced
Solution Approach 1:
The patent utilizes the vertical dimension by placing drive circuits and first contact holes in the substrate layer, while second contact holes are formed only in the flattened layer for electrical connection. This dimensional separation ensures electrical connectivity is maintained while minimizing the impact on the light-emitting region area of the flattened layer
Data Source
AI summary
A display device includes: a substrate; a flattened layer; at least one first light-emitting element; at least one second light-emitting element; at least one first drive circuit; and at least one second drive circuit, wherein light emitted by the first light-emitting element is taken out through the substrate, light emitted by the second light-emitting element is taken out from a direction opposite to a direction in which the light emitted by the first light-emitting element is taken out, the first light-emitting element is provided in an opening provided in the flattened layer, the second light-emitting element is provided in a layer above the flattened layer and overlaps the flattened layer, and the first drive circuit and the second drive circuit are provided closer to the substrate than the second light-emitting element.