Transmissive Display Anode for Under-Screen Camera Imaging
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Solution Overview
Problem
Current display technologies face a contradiction between achieving high light output efficiency and high transmittance of external light, which is necessary for under-screen camera imaging, as the metal reflective layer in conventional pixel structures reflects external light and limits light penetration.
Innovation Solution
A display panel design with a light transmissive area that includes an anode layer, pixel defining layer, and light-emitting functional layer, where the metal reflective layer is strategically positioned and sized to minimize its area, allowing for high light output efficiency while maximizing transmittance by reducing external light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a metal reflective layer is used in the anode to improve light output efficiency of the screen, then the light output efficiency is improved, but the transmittance of external light is reduced due to reflection
Solution Approach 1:
The anode is segmented into multiple transparent conductive layers (first transparent conductive layer, second transparent conductive layer, and third transparent conductive layer) instead of using a single metal reflective layer. This segmentation allows the structure to maintain electrical conductivity while reducing light reflection and improving both light output efficiency and external light transmittance.
Solution Approach 2:
The invention changes the material parameters of the anode from metal-based (high reflectivity) to transparent conductive oxide layers (low reflectivity, high transmittance). By adjusting the optical parameters of the anode materials, the contradiction between light output efficiency and external light transmittance is resolved.
2Area of stationary object
If the screen frame is minimized to achieve higher screen ratio, then the screen ratio is improved, but the positioning of optical electronic components becomes more difficult
Solution Approach 1:
The invention moves optical electronic components (such as cameras and sensors) from the traditional side-positioning in the screen frame to an under-screen positioning in the third dimension. This dimensional transition allows for higher screen ratios while still accommodating necessary components through transparent display areas.
3Area of stationary object
If camera components are placed under the display screen to minimize non-display areas, then the screen ratio is improved, but the imaging quality is reduced due to light reflection and interference
Solution Approach 1:
The display screen is segmented into different functional areas: light-emitting areas for display and light-transmissive areas for camera imaging. This spatial segmentation allows the same physical space to serve dual purposes, maintaining high screen ratio while ensuring high imaging quality through dedicated transparent regions.
Solution Approach 2:
Different regions of the display screen have different optical properties: light-emitting areas have high light output efficiency with metal reflective layers, while light-transmissive areas have high external light transmittance with transparent conductive layers. This local differentiation of optical quality resolves the contradiction between display performance and imaging quality.
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 configuration ensures high light output efficiency and high transmittance of external light, facilitating better imaging by under-screen cameras while minimizing the area occupied by the metal reflective layer.
Implementation Method 1
the metal reflective layer can effectively reflect the light of the light-emitting function layer 233, thereby improving brightness of the screen
Implementation Method 2
external light needs to penetrate the display screens to be received by the camera components
Data Source
AI summary
A display panel and a display device are disclosed. The display panel defines a basic display area and a light transmissive display area connected to the basic display area. The light transmissive display area includes an anode layer, a pixel defining layer, a light-emitting functional layer, and a cathode all sequentially laminated to each other. The anode layer includes a first transparent conductive layer, a metal reflective layer, and a second transparent conductive layer. The metal reflective layer is disposed on the first transparent conductive layer and corresponding to the light-emitting elements. The display device includes the display panel.