Display Device with Overlapping Light-Receiving and Emitting Elements
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Solution Overview
Problem
Current display devices lack a photosensing function and are not multifunctional, limiting their convenience and functionality.
Innovation Solution
A display device incorporating a light-receiving element and a light-emitting element, where the light-receiving element includes a pixel electrode, an active layer, and a common electrode, and the light-emitting element includes a pixel electrode, a light-emitting layer, and a common electrode, with overlapping structures to enable both display and light sensing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a display device incorporates both light-receiving and light-emitting elements with overlapping structures, then the device gains photosensing functionality and becomes multifunctional, but the device structure becomes more complex
Solution Approach 1:
The patent combines light-receiving elements and light-emitting elements into a single display device with overlapping structures. The light-receiving element includes a first pixel electrode, active layer, and common electrode, while the light-emitting element includes a second pixel electrode, light-emitting layer, and common electrode. These elements share common electrodes and overlapping structural components, merging multiple functions into one integrated device that can both display images and sense light for touch detection.
Solution Approach 2:
The display device is designed to perform multiple functions simultaneously: it serves as both a display device for image output and a photosensing device for light detection and touch sensing. The overlapping structure of light-receiving and light-emitting elements enables the device to capture light for imaging and detect touch inputs, even in dark environments, making it a universal multifunctional device.
2Reliability
If separate light-receiving and light-emitting devices are used, then each device can be optimized for its specific function, but the overall size and weight of the electronic device increase
Solution Approach 1:
The patent merges light-receiving and light-emitting functions into a single integrated display device. By sharing common electrodes and using overlapping structures where the light-receiving element and light-emitting element coexist in the same device footprint, the total weight is reduced compared to using separate devices, while maintaining optimized functionality for both light emission and light sensing.
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 solution provides a display device with both image display and light sensing functions, enhancing convenience and functionality by allowing image capture and touch detection, even in dark environments, while reducing the size and weight of electronic devices.
Implementation Method 1
a light-receiving element and a first light-emitting element in a display portion. The light-receiving element includes a first pixel electrode, an active layer, and a common electrode
Implementation Method 2
Light-emitting elements (also referred to as EL elements) utilizing an electroluminescence (hereinafter referred to as EL) phenomenon have features such as ease of reduction in thickness and weight
Data Source
AI summary
A display device having a photosensing function is provided. A highly convenient display device is provided. The display device includes a light-receiving element and a light-emitting element in a display portion. The light-receiving element includes a first pixel electrode, an active layer, and a common electrode. The light-emitting element includes a second pixel electrode, a light-emitting layer, and a common electrode. The active layer is positioned over the first pixel electrode. The active layer contains a first organic compound. The light-emitting layer is positioned over the second pixel electrode. The light-emitting layer contains a second organic compound different from the first organic compound. The common electrode includes a portion overlapping with the first pixel electrode with the active layer provided therebetween, and a portion overlapping with the second pixel electrode with the light-emitting layer provided therebetween. The display device preferably further includes a common layer positioned over the first pixel electrode and the second pixel electrode. The common layer includes a portion overlapping with the active layer and a portion overlapping with the light-emitting layer.