Multifunctional Display Pixel with Stacked Light-Emitting and Sensing Layers
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Solution Overview
Problem
Current display technologies face challenges in achieving high-resolution, multifunctional display apparatuses with integrated lighting and light-sensing capabilities, particularly in reducing the distance between light-emitting and light-receiving devices to enhance aperture ratio and display quality.
Innovation Solution
The implementation of a display apparatus with a pixel structure that includes a first light-emitting device, a second light-emitting device, and a light-receiving device, where the distance between the side surfaces of the light-emitting layers is less than or equal to 8 μm, and the use of a charge-generation layer to facilitate white light emission and infrared sensing, enabling high-resolution and reliable display with lighting and touch sensing functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the distance between light-emitting devices and light-receiving devices is reduced to enhance aperture ratio, then display quality and resolution are improved, but manufacturing precision requirements increase significantly
Solution Approach 1:
The patent transitions from planar arrangement to three-dimensional stacking, where light-emitting devices and light-receiving devices are arranged in different layers vertically. This dimensional change allows the aperture ratio to be improved without requiring reduced horizontal spacing, as the light paths are separated in the vertical dimension rather than competing for horizontal space.
Solution Approach 2:
The patent implements a nested structure where multiple functional layers (light-emitting layers, charge-generation layers, light-receiving devices) are stacked vertically within a compact pixel structure. This nesting allows multiple components to occupy overlapping horizontal footprints at different vertical levels, effectively increasing the aperture ratio without requiring increased lateral spacing between components.
2Adaptability or versatility
If multiple light-emitting devices and light-receiving devices are integrated in a single pixel to achieve multifunctionality, then display functionality is enhanced, but device complexity increases
Solution Approach 1:
The patent implements multi-functionality by integrating white light-emitting devices for illumination, colored light-emitting devices for display, and light-receiving devices for touch sensing within the same pixel structure. The charge-generation layers serve dual purposes of electrical isolation and optical waveguiding, demonstrating universal component design that reduces overall system complexity despite multiple functions.
Solution Approach 2:
The patent merges multiple functional components into a unified stacked structure where light-emitting devices and light-receiving devices share common electrode structures and insulation layers. The charge-generation layers simultaneously provide electrical isolation between stacked devices and guide light between layers, combining multiple functions into single structural elements that reduce overall device complexity.
3Reliability
If charge-generation layers are used to facilitate white light emission and infrared sensing, then display quality and sensing capability are improved, but manufacturing process complexity increases
Solution Approach 1:
The patent utilizes parameter changes in material properties, specifically the optical absorption characteristics of charge-generation layers. By selecting materials that are transparent to certain wavelengths (visible light for display, infrared for sensing) while absorbing others, the same layer structure enables multiple functions without requiring additional manufacturing steps for different components.
Solution Approach 2:
The patent employs composite material structures where charge-generation layers are formed using organic compounds with specific optical properties. These composite materials provide both electrical charge generation for device operation and selective optical transparency for light emission and sensing functions, achieving multiple objectives through material composition rather than structural complexity.
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
This configuration allows for a high-resolution, multifunctional display with improved aperture ratio, enabling clear and reliable full-color image display, lighting with good color rendering, and touch sensing capabilities, even in dark environments.
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
the first light-receiving device has a function of sensing light emitted from the first light-emitting device
Data Source
AI summary
A multifunctional display apparatus with high resolution is provided. The display apparatus includes a first pixel; the first pixel includes a first light-emitting device, a second light-emitting device, and a first light-receiving device; the first light-emitting device includes a first light-emitting layer; the second light-emitting device includes a second light-emitting layer; the second light-emitting device has a function of emitting white light; the first light-emitting device has a function of emitting visible light of a color different from that of the second light-emitting device; the first light-receiving device has a function of sensing light emitted from the first light-emitting device; a side surface of the first light-emitting layer faces a side surface of the second light-emitting layer; and the distance between the side surface of the first light-emitting layer and the side surface of the second light-emitting layer is less than or equal to 8 μm.