Anode Structure for Head-Mounted Display Light Efficiency
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Solution Overview
Problem
Head-mounted display devices suffer from low light efficiency due to the use of polarizers, which affects the display quality and luminance of emissive display devices.
Innovation Solution
The display device incorporates a pixel driving circuit with a conductive organic layer and a non-conductive organic layer, an anode with a double-layer structure, and an inorganic insulating layer with a tip structure, along with a separator and intermediate layers, to enhance light emission and reduce light efficiency dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a polarizer is used in the head-mounted display device, then the display device can be manufactured with conventional structures, but the light efficiency of the display device becomes low
Solution Approach 1:
The patent removes the polarizer from the head-mounted display device structure. By extracting this component that causes light loss, the device achieves higher light efficiency while maintaining manufacturability through the alternative use of emissive display technology with optimized organic layers and electrodes.
Solution Approach 2:
The patent changes the optical parameters of the display device by using emissive display technology with specific organic layers (conductive and non-conductive) and electrode configurations. This parameter change enables the device to operate without a polarizer, thereby improving light efficiency while remaining manufacturable.
2Device complexity
If the anode is formed with conventional single-layer structure, then the manufacturing process is simple, but the light emitting area is reduced and light efficiency disperses
Solution Approach 1:
The patent segments the anode into a double-layer structure with a lower layer containing silver and an upper layer including indium tin oxide (ITO). This segmentation allows the lower layer to provide electrical conductivity and the upper layer to enhance light emission, thereby increasing the light emitting area and improving light efficiency while maintaining manageable manufacturing complexity.
Solution Approach 2:
The patent uses composite material structure for the anode by combining silver (lower layer) and indium tin oxide (upper layer). This composite structure leverages the high electrical conductivity of silver and the optical properties of ITO to achieve both simple manufacturing and improved light efficiency through increased light emitting area.
3Device complexity
If the contact hole is not covered with conductive organic layer, then the manufacturing process is simpler, but the anode cannot be properly electrically connected to the transistor
Solution Approach 1:
The patent applies local quality by forming a conductive organic layer specifically in the contact hole region where electrical connection is needed, while using a non-conductive organic layer in other regions. This localized differentiation ensures proper electrical connection between the anode and transistor through the contact hole while maintaining the insulating properties required in other areas, thereby achieving both manufacturing feasibility and reliable electrical connection.
4Device complexity
If the intermediate layer continuously covers the separator, then the manufacturing process is simpler, but the light efficiency disperses and display quality decreases
Solution Approach 1:
The patent applies local quality by making the intermediate layer non-continuous on the separator surface, creating specific regions where the intermediate layer is present and regions where it is absent. This localized configuration prevents light efficiency dispersion by ensuring proper spacing and positioning, thereby improving display quality while maintaining reasonable manufacturing complexity through the use of a separator structure.
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 improves light efficiency and maintains high display quality by flattening the anode and increasing the light emitting area, resulting in consistent luminance and reduced light efficiency dispersion in head-mounted display devices.
Implementation Method 1
a conductive organic layer covering the contact hole and the organic layer around the contact hole, and electrically connected to the transistor through the contact hole
Implementation Method 2
changing the exposed conductive organic material to have non-conductive properties through an oxidation process; the conductive organic material loses conductivity by being separated into two OH groups as the thiophene ring is broken by the oxidation process
Implementation Method 3
the ITO of the upper layer of the anode may be polycrystallized; the anode is formed as a double layer having a lower layer containing silver and an upper layer including indium tin oxide (ITO), and the ITO of the upper layer of the anode may be polycrystallized
Data Source
AI summary
According to embodiments, a display device includes a pixel driving circuit including a transistor and disposed on a substrate, an organic layer covering the pixel driving circuit and including a contact hole, a conductive organic layer covering the contact hole and the organic layer around the contact hole and electrically connected to the transistor through the contact hole, a non-conductive organic layer disposed on the organic layer and disposed in a region where the conductive organic layer is not disposed, and an anode electrically connected to the conductive organic layer, and the contact hole overlaps the anode in a plan view.