OLED Cathode Layer Opening for Optical Compensation
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Solution Overview
Problem
Large-sized OLED display panels face a challenge in optical compensation due to the opaque nature of the cathode material, aluminum, which prevents light emitted by pixel units from reaching sensors, thereby hindering optical compensation and reducing the aperture ratio.
Innovation Solution
The display panel design includes a cathode layer that defines an opening to transmit light emitted from the light-emitting layer, allowing sensors to detect this light for optical compensation, and incorporates a light reflecting portion to enhance light transmission, along with a light blocking portion to prevent light from entering adjacent pixel units, thereby improving detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cathode layer is made opaque (using aluminum), then the structural integrity and electrical conductivity are improved, but light transmission to sensors is blocked, preventing optical compensation
Solution Approach 1:
The cathode layer is segmented into multiple regions: opaque regions for structural integrity and electrical conductivity, and transparent openings for light transmission to sensors. This segmentation allows the cathode to simultaneously fulfill its structural/electrical functions and enable optical compensation.
Solution Approach 2:
Different regions of the cathode layer have different optical properties - some regions are opaque (maintaining structural integrity) while specific local regions have transparent openings (enabling light transmission). This local differentiation resolves the contradiction between overall opacity and localized transparency needs.
2Illumination intensity
If the cathode layer is made transparent to enable light transmission, then optical compensation is improved, but the structural integrity and electrical conductivity are compromised
Solution Approach 1:
The cathode layer is divided into transparent opening regions and opaque regions. The transparent openings allow light transmission for optical compensation, while the surrounding opaque regions maintain the cathode's structural integrity and electrical conductivity pathways.
Solution Approach 2:
The cathode structure combines transparent and opaque materials or regions within a single layer, creating a composite structure that simultaneously provides light transmission pathways and maintains structural/electrical integrity through the opaque portions.
3Illumination intensity
If light reflecting portion is added to enhance light transmission, then optical compensation is improved, but device complexity increases
Solution Approach 1:
The light reflecting portion is merged with existing pixel structures such as the anode layer or pixel defining portion. By combining multiple functions (light reflection and structural definition) into a single integrated component, the solution enhances light transmission without proportionally increasing device complexity.
Solution Approach 2:
The light reflecting portion serves multiple functions: it reflects light to enhance transmission to sensors, and simultaneously acts as part of the pixel defining structure or electrode pattern. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in 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
This solution enables optical compensation for pixel units without the need for a pixel compensation circuit, reducing the number of thin film transistors and enhancing the aperture ratio by allowing light to be detected and utilized effectively.
Implementation Method 1
a light emitting layer located between the anode layer and the cathode layer
Implementation Method 2
a light reflecting portion configured to reflect a part of the light emitted from the light emitting layer to the opening
Data Source
AI summary
The present disclosure provides a display panel and a method for manufacturing the same, and a display device. The display panel includes: a substrate; a pixel unit array disposed on one side of the substrate, wherein the pixel unit array comprises a plurality of pixel units, at least one of the plurality of pixel units comprising an anode layer, a cathode layer, and a light emitting layer located between the anode layer and the cathode layer, the cathode layer defining an opening configured to transmit a light emitted from the light emitting layer; and at least one sensor disposed on one side of the pixel unit array away from the substrate and configured to detect a light transmitted through the opening.