Cathode Hole Shape for Under-Display Optical Integration
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Solution Overview
Problem
Conventional display devices require optical electronic components like cameras and sensors to be exposed on the front, leading to a large bezel or design restrictions, as they need to receive light from the front, which complicates the integration of these components without reducing the display area.
Innovation Solution
A display device with a light transmission structure where optical electronic devices are positioned under the display panel, utilizing a cathode hole structure with an inverted triangular or rhombic shape, and an anode extension line to maximize transmittance without the need for laser patterning, allowing for improved cathode hole quality and aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If optical electronic devices are installed on the front surface of the display device, then light reception is easy, but the bezel area is widened or the display area is reduced
Solution Approach 1:
The patent moves the optical electronic device from the front surface (2D plane) to the rear side of the display panel, utilizing the third dimension (depth) to resolve the conflict between light reception and display area. The light transmission structure allows light to pass through the display panel from front to back, enabling the optical device to receive light while being positioned on the rear side.
Solution Approach 2:
The patent introduces a light transmission structure as an intermediary between the front surface and the optical electronic device on the rear side. This structure includes transparent or translucent regions that allow light to pass through the display panel to reach the optical device, mediating between the need for light reception and the need to maintain display area.
2Ease of manufacture
If laser patterning is used to create the light transmission structure, then the structure can be formed, but signal lines are damaged
Solution Approach 1:
The patent replaces the laser patterning process (thermal/mechanical system) with a deposition-based approach. Instead of using laser to remove material and create patterns, the invention forms the light transmission structure by controlling the deposition of cathode material in specific regions, eliminating the harmful thermal effects that damage signal lines.
Solution Approach 2:
The patent performs preliminary patterning of the metal layer before cathode deposition. The metal patterning layer is formed first to define the regions where cathode material should not be deposited, creating the light transmission structure indirectly. This preliminary action prevents the need for subsequent laser processing that would damage signal lines.
3Illumination intensity
If the cathode hole aperture ratio is increased to maximize transmittance, then light transmission is improved, but the structural integrity and manufacturing precision become difficult to maintain
Solution Approach 1:
The patent forms the metal patterning layer before cathode deposition to predefine the boundaries of cathode holes. This preliminary structure serves as a mask that guides cathode material deposition, ensuring precise cathode hole formation with consistent dimensions and shapes, thereby maintaining manufacturing precision while achieving high aperture ratios.
Solution Approach 2:
The patent optimizes the parameters of cathode hole shape (inverted triangular or rhombic) and size to maximize aperture ratio while maintaining structural integrity. By carefully controlling the geometry parameters of cathode holes and their arrangement, the invention achieves high light transmission without compromising the structural stability of the display panel.
Data Source
AI summary
Embodiments relate to a display device, and more particularly, to a display device including a light emitting layer overlapping a cathode hole positioned in a first optical area, which may have a light transmission structure without using a laser, and may have a cathode hole in an inverted triangle shape or a rhombus shape to maximize the aperture ratio and transmittance in the first optical area.