Nested Display Device Structure for Step Reduction
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Solution Overview
Problem
Existing display devices face challenges in reducing steps and preventing cuts or splits in conductive films, which affect the reliability and convenience of light-emitting devices used in displays.
Innovation Solution
A display device structure incorporating a first and second light-emitting device, insulating and reflective films, and a conductive film, where specific distance relationships between these components are maintained to minimize steps and prevent cuts or splits, allowing for efficient green, red, and blue light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple light-emitting devices are arranged in a display device, then light emission functionality is improved, but steps between adjacent devices are generated
Solution Approach 1:
The patent applies nesting by placing the first light-emitting device inside the cavity formed by the second light-emitting device, and vice versa. This nested arrangement allows both devices to coexist in the same spatial region without creating steps, as each device is positioned within the cavity of the other, effectively eliminating the step problem while maintaining multi-color light emission functionality.
2Illumination intensity
If light-emitting devices are arranged with different distances to reflective films, then light emission characteristics are improved, but steps between devices are generated
Solution Approach 1:
The nested arrangement allows each light-emitting device to have its reflective film positioned at the optimal distance for its specific light emission characteristics, while the devices themselves are positioned within each other's cavities to eliminate steps. This resolves the contradiction by decoupling the distance optimization from step generation.
3Reliability
If conductive films are formed across light-emitting devices, then electrical connection is improved, but cuts or splits in conductive films occur
Solution Approach 1:
The conductive film is segmented into multiple regions: a first conductive film region formed on the first light-emitting device, a second conductive film region formed on the second light-emitting device, and an insulating film region between them. This segmentation prevents the conductive film from spanning across the cavity, eliminating the risk of cuts or splits while maintaining electrical connection through the respective electrode regions.
Solution Approach 2:
The insulating film acts as an intermediary between the two conductive film regions, preventing direct contact and potential damage across the cavity. The external electrode serves as another intermediary to establish electrical connection without requiring the conductive film to bridge the gap between devices, thus preventing cuts or splits.
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
The proposed structure enhances the reliability and convenience of display devices by reducing steps and preventing cuts or splits in conductive films, enabling effective green, red, and blue light emission for improved display performance.
Implementation Method 1
Light-emitting devices (organic EL devices) including organic compounds and utilizing electroluminescence (EL) have been put to more practical use. Carriers (holes and electrons) are injected by application of a voltage to the element, and light emission can be obtained from the light-emitting material by using the recombination energy of the carriers.
Implementation Method 2
a first reflective film and a second reflective film. The first reflective film is interposed between the first electrode and the insulating film, and there is a first distance DR between the first reflective film and the second electrode. The second reflective film is interposed between the third electrode and the insulating film
Data Source
AI summary
A novel display device that is highly convenient, useful, or reliable is provided. The display device includes a first light-emitting device, a second light-emitting device, an insulating film, a conductive film, a first reflective film, and a second reflective film; the first light-emitting device includes a first electrode, a second electrode, and a first unit; and the first electrode is interposed between the first unit and the insulating film. The second light-emitting device includes a third electrode, a fourth electrode, and a second unit; the third electrode is interposed between the second unit and the insulating film; and a first gap is provided between the third electrode and the first electrode. The conductive film electrically connects the second electrode and the fourth electrode to each other, and the first gap is interposed between the conductive film and the insulating film. The first reflective film is interposed between the first electrode and the insulating film, and there is a first distance DR between the first reflective film and the second electrode. The second reflective film is interposed between the third electrode and the insulating film, and there is a second distance DG between the second reflective film and the fourth electrode. The second distance DG is longer than the first distance DR and the difference is larger than 20 nm and smaller than 85 nm.