Transparent Display Organic Layers for Stray Light Reduction
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Solution Overview
Problem
Display apparatuses face challenges in achieving high sensitivity, resolution, aperture ratio, light extraction efficiency, and reliability while integrating image capturing and touch sensor functions, particularly in reducing noise and stray light effects.
Innovation Solution
A display apparatus with a structure comprising light-emitting and light-receiving elements, where organic layers with specific transmittance properties are used between the elements, and a common electrode with a visible-light-transmitting property is employed, along with a method for fabricating the apparatus that includes forming pixel electrodes, light-emitting and photoelectric conversion layers, and sacrificial layers to achieve high-resolution and reliable image capturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light-receiving elements are integrated adjacent to light-emitting elements in a display apparatus, then image capturing sensitivity is improved, but stray light from light-emitting elements interferes with image capturing quality
Solution Approach 1:
An organic layer is introduced as an intermediary substance between the light-emitting element and the light-receiving element. This organic layer selectively transmits certain wavelengths of light while blocking others, thereby mediating the interaction between light emission and light detection to prevent stray light interference while maintaining image capturing sensitivity
Solution Approach 2:
The organic layer is positioned specifically in the region between adjacent light-emitting and light-receiving elements where stray light interference occurs. By applying the light-blocking function locally at this critical interface rather than throughout the entire device, the patent prevents interference while preserving overall light transmission efficiency
2Measurement precision
If multiple functional layers are added between light-emitting and light-receiving elements to block stray light, then image capturing quality is improved, but light extraction efficiency decreases
Solution Approach 1:
The organic layer's optical parameters (wavelength selectivity, transmittance characteristics) are optimized to achieve a balance between blocking stray light and transmitting useful light. By carefully controlling the layer's thickness, material composition, and spectral properties, the patent achieves effective stray light rejection while maintaining high light extraction efficiency for the display function
3Manufacturing precision
If high-resolution pixel structures are implemented, then display resolution is improved, but aperture ratio decreases
Solution Approach 1:
The organic layer exhibits wavelength-dependent transmittance characteristics, allowing different colors (wavelengths) of light to pass through at different rates. This optical filtering property enables the layer to be positioned in regions where it blocks stray light between pixels while being transparent to display colors, thereby supporting high-resolution pixel structures without significantly reducing the aperture ratio
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 high-sensitivity image capturing, high-resolution display, and high light extraction efficiency while allowing users to see the background, thereby enhancing the overall display quality and functionality of the apparatus.
Implementation Method 1
Transmittance of light with a specific wavelength which is at least part of a visible light wavelength through the first organic layer is lower than transmittance of light with the specific wavelength in the second organic layer
Implementation Method 2
Light-emitting elements (also referred to as EL elements) utilizing an electroluminescence (hereinafter referred to as EL) phenomenon
Implementation Method 3
The light-receiving element includes a third pixel electrode, a photoelectric conversion layer over the third pixel electrode
Data Source
AI summary
A display apparatus through which a user can see the background and which is capable of performing image capturing with high sensitivity is provided. The display apparatus includes a first light-emitting element, a second light-emitting element adjacent to the first light-emitting element, a light-receiving element adjacent to the second light-emitting element, a first organic layer provided between the second light-emitting element and the light-receiving element, and a second organic layer provided between the first light-emitting element and the second light-emitting element over a substrate with a visible-light-transmitting property. The first light-emitting element has a structure in which a first pixel electrode, a first light-emitting layer, and a common electrode are stacked in this order. The second light-emitting element has a structure in which a second pixel electrode, a second light-emitting layer, and the common electrode are stacked in this order. The light-receiving element has a structure in which a third pixel electrode, a photoelectric conversion layer, and the common electrode are stacked in this order. Transmittance of light with a wavelength which is at least part of the visible light wavelength in the first organic layer is lower than transmittance of light with the wavelength in the second organic layer.