OLED Display Panel Conductive Reflection Layer Voltage Drop
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Solution Overview
Problem
OLED display panels face issues with poor display quality due to significant voltage drops across different display units, leading to uneven brightness and reduced luminance efficiency.
Innovation Solution
A conductive reflection layer is disposed on the power lines across the substrate, reducing overall resistance and voltage drop, while a micro-cavity structure is formed between the reflection layer and cathode to maximize light resonance, enhancing luminance. The optical modulation layer is positioned between the reflection layer and the anode to prevent light loss and simplify the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional OLED structure without a reflection layer is used, then the manufacturing process is simpler, but the voltage drop across display units is significant leading to poor display quality
Solution Approach 1:
The reflection layer is designed to serve multiple functions simultaneously: it reflects light to enhance luminance, provides electrical connection to reduce voltage drop, and acts as an electrode component. This multi-functionality resolves the contradiction by improving display quality while adding minimal structural complexity.
Solution Approach 2:
The patent combines the reflection layer with the electrode structure, merging two previously separate functions (light reflection and electrical conduction) into a single integrated component. This reduces the number of separate layers needed and simplifies the overall device structure while improving performance.
2Ease of manufacture
If the optical modulation layer is positioned between the reflection layer and the anode, then light loss is prevented and manufacturing is simplified, but the layer arrangement becomes more specific
Solution Approach 1:
The optical modulation layer is positioned in advance between the reflection layer and anode during the manufacturing process, preventing light loss before it occurs. This preliminary positioning of the optical layer simplifies the overall manufacturing process by establishing the correct optical path early in the fabrication sequence.
3Loss of energy
If power lines are connected directly without a reflection layer, then the electrical connection is direct, but the overall resistance is high causing significant voltage drop
Solution Approach 1:
The reflection layer is designed to serve multiple functions simultaneously: it reflects light to enhance luminance, provides electrical connection to reduce voltage drop, and acts as an electrode component. This multi-functionality resolves the contradiction by improving display quality while adding minimal structural complexity.
Solution Approach 2:
The patent combines the reflection layer with the electrode structure, merging two previously separate functions (light reflection and electrical conduction) into a single integrated component. This reduces the number of separate layers needed and simplifies the overall device structure while improving performance.
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 reduces voltage drop and improves display quality by maintaining consistent voltage levels across display units and increases luminous efficiency by maximizing light resonance, resulting in enhanced luminance and simplified manufacturing.
Implementation Method 1
a micro-cavity structure is formed between the reflection layer and cathode to maximize light resonance, enhancing luminance
Implementation Method 2
a conductive reflection layer is disposed on the power lines across the substrate
Data Source
AI summary
An Organic Light Emitting Diode (OLED) display panel is disclosed. The display panel includes a substrate, a plurality of power lines disposed on the substrate, and a reflection layer disposed on the power lines, where the reflection layer is electrically connected with the power lines. The display panel also includes an anode disposed on the reflection layer, an optical modulation layer disposed between the reflection layer and the anode, a cathode disposed on the anode, and an organic emitting device layer disposed between the anode and the cathode, where the reflection layer is insulated from the anode, and the OLED display panel is configured to transmit light from a side of the reflection layer away from the substrate.