Tandem OLED Subpixel Structure for Head-Mounted Display
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Solution Overview
Problem
Wearable electronic devices with display devices for augmented and virtual reality often suffer from pixel granularity issues, leading to reduced immersion and realistic sensations, and can be burdensome for users due to their weight.
Innovation Solution
A display device with a high pixel density, capable of full-color display, featuring subpixels with a tandem light-emitting device structure and a charge-generation layer, and a wireless communication function for reduced burden and improved user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the distance between display portion and user is reduced, then immersion and realistic sensation are improved, but pixel granularity becomes more noticeable
Solution Approach 1:
The display device divides the display area into multiple subpixels (red, green, blue) arranged in a specific pattern. Each subpixel is further divided into multiple emission regions, creating a segmented structure that reduces perceived pixel size and granularity while maintaining color quality and immersion.
Solution Approach 2:
Different regions of the display have optimized characteristics - the emission regions are positioned and sized to match human visual acuity, with color filtering layers and light-emitting elements configured to provide optimal color purity and brightness in each local area, reducing pixel visibility while maintaining overall image quality.
2Manufacturing precision
If pixel density is increased, then immersion and realistic sensation are improved, but manufacturing complexity increases
Solution Approach 1:
The display device uses a unified structure for all subpixels, with each subpixel containing the same basic components (light-emitting element, color filtering layer, emission regions). This standardized multi-functional design simplifies manufacturing processes while achieving high pixel density through efficient space utilization.
Solution Approach 2:
The display employs a three-dimensional layered structure with light-emitting elements, color filtering layers, and emission regions arranged in multiple dimensions. This vertical stacking approach increases pixel density without proportionally increasing planar manufacturing complexity, as many layers can be formed using standard thin-film deposition techniques.
3Weight of moving object
If HMD weight is reduced, then user burden is decreased, but display quality may be compromised
Solution Approach 1:
The display device uses thin-film structures for color filtering layers and light-emitting elements, replacing bulkier traditional components. This thin-film approach significantly reduces the weight of the display portion while maintaining optical performance and display quality through optimized film thickness and material selection.
Solution Approach 2:
The display device optimizes parameters such as emission region size, color filtering layer thickness, and light-emitting element dimensions to achieve maximum display quality with minimum material usage. By carefully controlling these parameters, the device maintains high immersion and realistic sensation while minimizing weight.
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 enhances immersion and realistic sensations by minimizing pixel granularity and reducing user burden through high-resolution, lightweight, and high-quality display technology.
Implementation Method 1
The first EL layer includes a first light-emitting material emitting blue light and a second light-emitting material emitting light having a longer wavelength than blue light
Implementation Method 2
a first coloring layer transmitting blue light
Data Source
AI summary
A display device with a high level of immersion or realistic sensation is provided. The display device includes a display portion capable of full-color display, a communication portion having a wireless communication function, and a wearing portion having a function of being worn on a head. The display portion includes a subpixel including a light-emitting device and a coloring layer transmitting blue light. The light-emitting device contains a first light-emitting material emitting blue light and a second light-emitting material emitting light having a longer wavelength than blue light. The light-emitting device includes a first light-emitting unit, a charge-generation layer, and a second light-emitting unit that are stacked in this order. In an emission spectrum obtained with the display portion performing blue display at low luminance, when the intensity of a first emission peak at a wavelength higher than or equal to 400 nm and lower than 500 nm is regarded as 1, the intensity of a second emission peak at a wavelength higher than or equal to 500 nm and lower than or equal to 700 nm in the emission spectrum is lower than or equal to 0.5.