Display Apparatus Light-Blocking Layers for Image Capturing
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Solution Overview
Problem
Display apparatuses face challenges in achieving high resolution, low power consumption, and effective image capturing with high sensitivity while minimizing noise and maintaining high aperture ratios, especially in integrating light-emitting and light-receiving elements for biometric authentication.
Innovation Solution
A display apparatus design incorporating light-emitting and light-receiving elements with a novel structure, including multiple light-blocking layers and lenses, and an insulating layer to separate organic layers and prevent leakage current, allowing for high-resolution image capture and display with reduced noise and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light-emitting and light-receiving elements are integrated in close proximity for high-resolution imaging, then resolution is improved, but leakage current between elements increases
Solution Approach 1:
The patent divides the pixel structure into distinct light-emitting elements and light-receiving elements separated by light-blocking layers. This segmentation prevents optical crosstalk and leakage current between adjacent elements while maintaining high spatial resolution through precise positioning of the separated components.
Solution Approach 2:
Light-blocking layers are introduced as intermediary structures between light-emitting and light-receiving elements. These layers block stray light and prevent leakage current, enabling high-resolution imaging by ensuring that each light-receiving element only detects light from its corresponding light-emitting element.
2Measurement precision
If multiple light-blocking layers are added to prevent leakage and reduce noise, then image capturing quality is improved, but device complexity increases
Solution Approach 1:
Light-blocking layers are strategically positioned only where needed—specifically between adjacent light-emitting and light-receiving elements and at boundaries of pixel regions. This localized approach prevents noise and leakage current without adding unnecessary complexity to the entire device structure.
3Object-affected harmful factors
If light-blocking layers are positioned close to light-emitting elements to reduce noise, then noise reduction is improved, but aperture ratio decreases
Solution Approach 1:
The patent positions light-blocking layers in the vertical dimension (between substrates) rather than only in the horizontal plane. This three-dimensional arrangement allows the light-blocking layers to effectively block stray light and reduce noise while minimizing their horizontal footprint, thereby preserving a high 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 a display apparatus with high display quality, high-resolution image capturing, and biometric authentication capabilities, while reducing power consumption and noise, and enhancing the reliability and sensitivity of image capturing.
Implementation Method 1
Light-emitting elements (also referred to as EL elements) utilizing an electroluminescence (hereinafter referred to as EL) phenomenon
Implementation Method 2
a light-receiving element adjacent to the light-emitting element
Data Source
AI summary
A display apparatus having an image capturing function is provided. An image capturing device or a display apparatus capable of high-sensitivity image capturing can be provided. The display apparatus includes a first substrate, a second substrate facing the first substrate, a light-emitting element over the first substrate, a light-receiving element adjacent to the light-emitting element, a first light-blocking layer over the first substrate, a second light-blocking layer on the surface of the second substrate facing the first substrate, and a third light-blocking layer on the surface of the second light-blocking layer facing the first substrate. Each of the first to third light-blocking layers is provided between the light-emitting element and the light-receiving element in a plan view. The first light-blocking layer and the third light-blocking layer are provided so as to have a space between each other in a plan view.