Display Apparatus Leakage Current Reduction via Insulating Layer
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Solution Overview
Problem
Display apparatuses face challenges in achieving high resolution, low power consumption, and integrating image capturing functions while maintaining high display quality and aperture ratio, especially in reducing leakage currents between light-emitting and light-receiving elements.
Innovation Solution
A display apparatus comprising a light-emitting element and a light-receiving element with a photoelectric conversion layer, where the elements are processed into island shapes and separated by a resin layer and insulating layer to minimize leakage currents, and using overlapping coloring layers to enhance image capturing sensitivity and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light-emitting elements and light-receiving elements are integrated in close proximity to achieve high resolution and high aperture ratio, then display quality and image capturing capability are improved, but leakage currents between the elements increase
Solution Approach 1:
An insulating layer is introduced as an intermediary between the light-emitting element and light-receiving element. This insulating layer acts as a mediator that blocks leakage currents while allowing the elements to remain in close proximity for high resolution and high aperture ratio performance.
Solution Approach 2:
The patent divides the device into distinct functional regions with the insulating layer creating a clear separation between the light-emitting element and light-receiving element. This segmentation allows each element to be optimized independently while maintaining close spatial proximity for high resolution.
2Measurement precision
If the distance between light-emitting element and light-receiving element is reduced to improve resolution and aperture ratio, then display quality and image capturing sensitivity are improved, but leakage currents increase
Solution Approach 1:
The insulating layer serves as a protective intermediary that enables the elements to be positioned at minimal distance for high sensitivity image capturing while preventing energy loss through leakage currents.
3Reliability
If multiple layers including coloring layers are added to enhance image capturing sensitivity and display quality, then functional performance is improved, but device complexity increases
Solution Approach 1:
The insulating layer performs multiple functions simultaneously: it provides electrical insulation to block leakage currents, serves as a structural support layer, and enables the integration of multiple functional layers (coloring layers, light-emitting element, light-receiving element) in a compact configuration. This multi-functionality improves image capturing sensitivity and display quality without proportionally increasing device 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
The solution enables high-resolution, low-power consumption display with integrated image capturing capabilities, reducing leakage currents and improving signal-noise ratio for clear image capture even in low light conditions, while maintaining high aperture ratio and display quality.
Implementation Method 1
The second organic layer includes a photoelectric conversion layer. The photoelectric conversion layer has sensitivity in a wavelength range of light passing through the first coloring layer.
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, high-speed response to an input signal
Data Source
AI summary
A display apparatus having an image capturing function is provided. A display apparatus with a high aperture ratio is provided. The display apparatus includes a first light-emitting element, a light-receiving element, and a first coloring layer; the first light-emitting element includes a first pixel electrode, a first organic layer over the first pixel electrode, and a common electrode over the first organic layer; the light-receiving element includes a second pixel electrode, a second organic layer over the second pixel electrode, and the common electrode over the second organic layer; the first organic layer includes a first light-emitting layer; the second organic layer includes a photoelectric conversion layer; the first coloring layer is positioned to overlap with first light-emitting element; and the photoelectric conversion layer has sensitivity in a wavelength range of light passing through the first coloring layer.