Electrowetting Display Panel for High Transmittance Near-Eye VR
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Solution Overview
Problem
Conventional display technologies, such as LCD and OLED, face challenges in achieving high transmittance and high Pixels Per Inch (PPI) due to limitations in their structural components, which affect light transmission and make it difficult to meet the requirements of Virtual Reality (VR) and Augmented Reality (AR) applications.
Innovation Solution
A display panel comprising a light waveguide layer and a substrate with an electrowetting control layer that includes a grating layer and an electrowetting layer, allowing for variable refractive index gratings and grating switching, eliminating the need for a color filter and polarizer, and enabling high transmittance and near-eye display capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional LCD and OLED structures are used, then manufacturing process is established, but transmittance and transmitted spectrum are greatly affected
Solution Approach 1:
The patent removes conventional functional layers (polarizers, color filters, backlight sources) that block or alter light. By extracting these components and replacing them with a waveguide-based electrowetting display structure, the system achieves high transmittance while maintaining manufacturing feasibility through standardized substrate and electrode layer processes
Solution Approach 2:
The patent replaces mechanical/optical components (polarizers, color filters, divergent light sources) with an electrowetting-based optical modulation system. This substitution uses electric field control of liquid interfaces rather than physical optical components, eliminating light-blocking layers and achieving high transmittance
2Manufacturing precision
If conventional LCD and OLED structures are used, then manufacturing process is established, but PPI is difficult to achieve high
Solution Approach 1:
The patent transitions from planar pixel definitions to waveguide-based optical routing where light propagation direction and wavelength encode pixel information. This dimensional shift in the optical domain enables high PPI without proportionally increasing physical substrate complexity
Solution Approach 2:
The waveguide structure serves multiple functions simultaneously: light propagation, pixel definition through grating patterns, and color filtering through wavelength-selective coupling. This multi-functionality achieves high PPI while keeping the manufacturing process manageable by consolidating multiple functions into a single integrated component
3Illumination intensity
If conventional display structures are used, then light emission is achieved, but emitted light is divergent and near-eye display is difficult
Solution Approach 1:
The patent pre-configures the waveguide with specific grating patterns and coupling structures that inherently guide light in predetermined directions toward the viewer's eye. This preliminary optical routing eliminates the need for additional divergent light correction and directly achieves near-eye display geometry
Solution Approach 2:
The patent segments the waveguide into multiple coupling regions with different grating orientations and periods, each directing light to specific viewing zones. This segmentation enables precise control of light emission direction for near-eye display while maintaining overall system simplicity
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 achieves high transmittance, high resolution, and near-eye display by controlling light emission direction and color, reducing power consumption and improving screen brightness, while allowing for small pixel sizes and fast response times without viewing angle limitations.
Implementation Method 1
an electrowetting layer which are disposed between the first electrode layer and the second electrode layer, the grating layer and the electrowetting layer are configured to operatively couple light
Implementation Method 2
the light waveguide layer and the grating layer form a waveguide grating coupler
Implementation Method 3
one or more side surfaces of the light waveguide layer are configured as an incident surface for collimated backlight
Data Source
AI summary
A display panel includes a light waveguide layer and a first substrate disposed opposite to each other, and further including an electrowetting control layer disposed between the light waveguide layer and the first substrate, the electrowetting control layer including a first electrode layer, a second electrode layer, and a grating layer and an electrowetting layer which are disposed between the first electrode and the second electrode layer, the grating layer and the electrowetting layer are configured to operatively couple light with a set transmittance, a setting direction, and a set wavelength out of the light waveguide layer.