Display Apparatus with Shared Common Electrode for Photosensing
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Solution Overview
Problem
Existing display apparatuses lack a photosensing function, are not highly convenient, are not multifunctional, do not have high display quality, and do not have high light sensitivity, while also requiring complex external circuits.
Innovation Solution
A display apparatus is designed with a first pixel circuit including a light-receiving device and transistors, and a second pixel circuit including a light-emitting device, where the light-receiving device and light-emitting device share common layers and electrodes, and transistors with low-temperature polysilicon and metal oxide semiconductor layers are used to simplify the circuit and enhance functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a display apparatus is designed to include both light-receiving and light-emitting devices with separate circuits, then photosensing function and display function are achieved, but device complexity and circuit complexity increase
Solution Approach 1:
The patent combines light-receiving devices and light-emitting devices into a single display apparatus with a shared substrate and common electrode structure. Both device types are integrated on the same substrate, sharing common layers including the common electrode, thereby reducing overall device complexity while maintaining dual functionality for photosensing and display
Solution Approach 2:
The common electrode serves multiple functions: it acts as the cathode for light-emitting devices and as the anode for light-receiving devices. This universal component enables both display and photosensing functions within a single integrated structure, eliminating the need for separate circuit systems
2Ease of manufacture
If conventional display apparatuses use standard organic compounds for both light-receiving and light-emitting layers, then manufacturing is simplified, but light sensitivity and display quality are limited
Solution Approach 1:
The patent employs different organic compounds specifically tailored for each functional layer: the light-receiving layer uses compounds optimized for photodetection with high quantum efficiency, while the light-emitting layer uses compounds optimized for electroluminescence with high brightness and color purity. This localized optimization of material properties enhances both light sensitivity and display quality without significantly complicating the manufacturing process
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 display apparatus achieves a photosensing function, enhanced convenience, multifunctionality, high display quality, and high light sensitivity, while simplifying the external circuit and reducing manufacturing costs.
Implementation Method 1
a light-receiving device, a first transistor, and a second transistor; the light-receiving device includes a first pixel electrode, an active layer, and a common electrode
Implementation Method 2
a light-emitting device; the light-emitting device includes a second pixel electrode, a light-emitting layer, and the common electrode
Data Source
AI summary
A display apparatus having a photosensing function is provided. The display apparatus includes a first pixel circuit and a second pixel circuit. The first pixel circuit includes a light-receiving device, a first transistor, and a second transistor. The second pixel circuit includes a light-emitting device. The light-receiving device includes a first pixel electrode, an active layer, and a common electrode. The light-emitting device includes a second pixel electrode, a light-emitting layer, and the common electrode. The active layer is positioned over the first pixel electrode and includes a first organic compound. The light-emitting layer is positioned over the second pixel electrode and includes 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 therebetween and a portion overlapping with the second pixel electrode with the light-emitting layer therebetween. The first transistor includes low-temperature polysilicon as a semiconductor layer and the second transistor includes a metal oxide as a semiconductor layer.