Under-Screen Display Panel With Variable Cathode Thickness
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Solution Overview
Problem
Current full-screen display panels face limitations in effective area utilization due to uniform common electrode layer thickness, which prevents achieving both display and light transmission requirements in under-screen device areas, hindering the production of full-screen designs.
Innovation Solution
Incorporating a deformation layer with a changeable volume between the pixel definition and cathode layers, allowing the cathode layer thickness to vary between under-screen and non-under-screen device areas, enabling reduced cathode layer thickness in under-screen areas through illumination conditions, thereby facilitating installation of hardware and maintaining light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a uniform common electrode layer is vapor-deposited on the entire surface of the display panel, then the manufacturing process is simple and consistent, but the light transmission requirement in the under-screen device area cannot be met
Solution Approach 1:
The patent applies local quality by creating different cathode layer thicknesses in different regions of the display panel. The under-screen device area has a thinner cathode layer to allow light transmission, while other areas maintain the standard thickness for normal display function. This regional differentiation resolves the contradiction between uniform manufacturing simplicity and localized light transmission requirements.
Solution Approach 2:
The patent introduces a deformation layer that can change its thickness dynamically or be formed with varying thickness to control the underlying cathode layer thickness. This dynamic or variable structure allows the cathode layer to be thinner in the under-screen device area while maintaining uniform deposition processes, thus balancing manufacturing simplicity with optical performance requirements.
2Ease of operation
If installation holes are formed in the non-display area, then hardware installation space is reserved, but the effective display area is reduced and full-screen design cannot be achieved
Solution Approach 1:
The patent implements nesting by placing hardware components (such as cameras or sensors) underneath the display panel in the under-screen device area. This allows the hardware to be nested within the display structure without occupying display area, enabling full-screen design while maintaining hardware installation capability. The deformation layer and variable cathode thickness facilitate this nested arrangement by allowing light transmission through the under-screen area.
3Illumination intensity
If the cathode layer thickness is reduced in the under-screen device area, then light transmission is improved, but the display quality in that area may be compromised
Solution Approach 1:
The patent applies local quality by ensuring that the under-screen device area with reduced cathode layer thickness is specifically positioned where hardware installation is required, while the majority of the display area maintains standard cathode layer thickness for optimal display quality. This localized thinning approach improves light transmission only where necessary without compromising overall display performance.
Solution Approach 2:
The patent segments the display panel into different functional areas: the under-screen device area with thinner cathode layer for light transmission and hardware access, and the main display area with standard cathode layer thickness for high-quality display. This segmentation allows each area to be optimized for its specific function without negatively affecting the other.
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 approach allows for reduced border width, increased effective display area, and successful implementation of full-screen designs while ensuring normal display and light transmittance in under-screen device areas, enhancing the overall display effect.
Implementation Method 1
a volume of the deformation layer expands under a first predetermined condition to enable a thickness of the cathode layer in the under-screen device area to be less than a thickness of the cathode layer in the non-under-screen device area
Data Source
AI summary
A display panel, a manufacturing method of the display panel, and a display device are provided. The display panel includes an under-screen device area and a non-under-screen device area, wherein an area under the under-screen device area includes an area where hardware is installed; the under-screen device area includes a substrate portion, an anode layer, a pixel definition layer, a deformation layer, a cathode layer, and an encapsulation layer; wherein, a volume of the deformation layer expands under a first predetermined condition to enable a thickness of the cathode layer in the under-screen device area less than a thickness of the cathode layer in the non-under-screen device area.