Dual-Function OLED Subpixel Layout for Higher-Resolution Light Sensing
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Solution Overview
Problem
Current display apparatuses with light detection functions face challenges in increasing resolution, aperture ratio, manufacturing yield, and reducing manufacturing costs and complexity, particularly in integrating light-emitting and light-receiving capabilities without increasing the number of subpixels or components.
Innovation Solution
A display apparatus design incorporating a pixel structure with a light-emitting and light-receiving device that functions as both a light emitter and receiver, utilizing a shared layer structure with organic EL devices and organic photodiodes, which reduces the number of manufacturing steps and components while enhancing resolution and aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate light-emitting and light-receiving subpixels are used, then light detection function is achieved, but resolution and aperture ratio decrease
Solution Approach 1:
The patent applies multi-functionality by enabling the light-emitting device to perform both light emission and light reception functions. The light-emitting device includes a light-emitting layer that can emit light and an active layer that can detect light, allowing a single subpixel to serve dual purposes rather than requiring separate subpixels for emission and detection.
Solution Approach 2:
The patent combines the light-emitting and light-receiving functions into a single integrated device structure. The light-emitting device merges the light-emitting layer and active layer in one stack, eliminating the need for separate light-emitting subpixels and light-receiving subpixels, thereby increasing the aperture ratio and resolution.
2Adaptability or versatility
If separate light-emitting and light-receiving subpixels are used, then light detection function is achieved, but aperture ratio decreases
Solution Approach 1:
The light-emitting device is designed to perform both light emission and light reception functions, allowing the entire subpixel area to contribute to both display and sensing functions. This eliminates the need to reserve separate areas for light-receiving subpixels, thereby maximizing the aperture ratio.
Solution Approach 2:
The patent merges the light-emitting and light-receiving functions into a single device stack that occupies the same spatial footprint. By combining these functions in one integrated structure rather than using separate subpixels, the aperture ratio is increased as the same area serves dual purposes.
3Adaptability or versatility
If separate light-emitting and light-receiving devices are used, then light detection function is achieved, but device complexity and manufacturing steps increase
Solution Approach 1:
The patent combines multiple functional layers into a single integrated light-emitting device structure. The device includes an anode, hole-transport layer, light-emitting layer, active layer, electron-transport layer, and cathode in one stack, eliminating the need for separate light-emitting devices and light-receiving devices, thereby reducing device complexity and the number of components.
4Adaptability or versatility
If separate light-emitting and light-receiving devices are used, then light detection function is achieved, but manufacturing cost increases
Solution Approach 1:
The patent merges the light-emitting and light-receiving functions into a single device that can be manufactured using the same organic EL fabrication processes. This integration reduces manufacturing cost by eliminating the need to produce and assemble separate light-receiving devices, and by utilizing existing organic EL manufacturing infrastructure for both display and sensing functions.
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 enables a multifunctional display apparatus with improved resolution, aperture ratio, and reduced manufacturing complexity and costs, allowing for both image display and light detection functions without the need for separate light-emitting and light-receiving subpixels.
Implementation Method 1
Light-emitting devices (also referred to as EL devices or EL elements) utilizing electroluminescence (hereinafter referred to as EL)
Implementation Method 2
a light-emitting and light-receiving device, which has a function of emitting light and a function of receiving light
Data Source
AI summary
The resolution of a display apparatus having a light detection function is increased. A display apparatus includes a plurality of transistors and a light-emitting and light-receiving device in a subpixel. The light-emitting and light-receiving device has a function of emitting light of a first color and a function of receiving light of a second color. One of a source and a drain of a first transistor is electrically connected to a first wiring, and the other thereof is electrically connected to a gate of a second transistor. One electrode of the light-emitting and light-receiving device is electrically connected to one of a source and a drain of the second transistor, one of a source and a drain of a third transistor, and one of a source and a drain of a fifth transistor. One of a source and a drain of a fourth transistor is electrically connected to a second wiring, and the other thereof is electrically connected to the other of the source and the drain of the third transistor.