Integrated Light-Sensing Display Device with Organic Photoelectric Layer
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Solution Overview
Problem
Current display devices lack the functionality of sensing light, which limits their versatility and convenience, particularly in applications requiring both display and sensing capabilities.
Innovation Solution
A display device is designed with a light-receiving element and a light-emitting element positioned between substrates, where the light-receiving element includes an organic compound layer, and a transistor is electrically connected to both elements, allowing for light sensing and emission control, with optional insulating and coloring layers for improved light management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a display device includes only display functionality, then the device structure is simple, but the device lacks versatility and sensing capability
Solution Approach 1:
The patent combines light-receiving and light-emitting functions within a single display device structure. The light-receiving element and light-emitting element are integrated into the same device, allowing the display to simultaneously perform display and sensing functions, thereby resolving the contradiction between versatility and device complexity.
Solution Approach 2:
The display device is designed to perform multiple functions: it can display images through the light-emitting element and sense light through the light-receiving element. This multi-functional design directly addresses the versatility requirement while maintaining a unified device structure.
2Adaptability or versatility
If separate display and sensing devices are used, then each device can be optimized for its function, but the overall device size and component count increase
Solution Approach 1:
The patent merges the display function and sensing function into a single integrated device. By placing both the light-emitting element and light-receiving element within the same device boundaries, it eliminates the need for separate display and sensing devices, thereby reducing overall device size while maintaining multifunctional capability.
Solution Approach 2:
The light-receiving element and light-emitting element are nested within the same device structure, with both elements positioned between the same pair of substrates. This nesting arrangement allows maximum space utilization and minimizes the overall device footprint.
3Length of stationary object
If the light-receiving element is positioned close to the light-emitting element, then the device thickness is reduced, but light sensing accuracy may be affected
Solution Approach 1:
The patent positions the light-receiving element and light-emitting element at different locations within the device thickness direction. The light-receiving element is positioned closer to one substrate while the light-emitting element is positioned closer to the other substrate, creating optimal local conditions for both emission and reception while maintaining reduced overall thickness.
Solution Approach 2:
The patent resolves the thickness-accuracy contradiction by utilizing the thickness dimension strategically. By positioning elements at different depths within the device structure rather than side-by-side, it achieves both thin profile and adequate light sensing performance through three-dimensional spatial arrangement.
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 device achieves a multifunctional capability of displaying images and sensing light, enabling applications such as biological authentication and touch detection, while reducing the number of components and size of electronic devices.
Implementation Method 1
The light-receiving element includes a layer containing an organic compound
Implementation Method 2
Light-emitting elements (also referred to as EL elements) utilizing electroluminescence (hereinafter referred to as EL)
Data Source
AI summary
A display device having a function of sensing light is provided. A highly convenient display device is provided. The display device includes a first substrate, a second substrate, a light-receiving element, a transistor, and a light-emitting element in a display portion. The light-receiving element, the transistor, and the light-emitting element are each positioned between the first substrate and the second substrate. The light-receiving element is positioned closer to the first substrate than the transistor is. The light-emitting element is positioned closer to the second substrate than the transistor is. The light-receiving element includes a layer containing an organic compound. The transistor is electrically connected to the light-emitting element. The display device preferably further includes a lens and light transmitted through the lens preferably enters the light-receiving element.