Light-Emitting Substrate With Dual Modulation Layers for Eye-Box Control
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Solution Overview
Problem
Existing virtual display apparatuses suffer from low light utilization rates due to wasted light outside the receivable angles by the eye box and significant light loss during transmission through the display panel.
Innovation Solution
A light emitting substrate with a first light modulation layer configured to converge light and a second light modulation layer configured to deflect light, optimizing the light path to ensure that light with at least 80% of the maximum luminance is limited to angles receivable by the eye box, using microstructures with varying refractive indices and geometries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If light is emitted in all directions from the light source, then the light coverage area is maximized, but the light utilization rate decreases due to light falling outside the receivable angles
Solution Approach 1:
The patent applies local quality by creating different microstructure regions (first and second light modulation layers with different microstructures) at different locations in the light path. Each region has optimized local optical properties to control light direction, ensuring light is concentrated in the receivable angle range while maintaining broad coverage area through the combined effect of both layers.
Solution Approach 2:
The patent changes optical parameters by introducing microstructures with specific geometries and refractive indices that modify light propagation characteristics. The microstructures alter the light emission angle distribution, transforming omnidirectional light into directed light within the receivable angle range, thereby improving light utilization without sacrificing coverage area.
2Device complexity
If a single light modulation layer is used, then the device structure is simple, but the light control precision is insufficient to achieve both convergence and deflection
Solution Approach 1:
The patent segments the light modulation function into two distinct layers: a first light modulation layer with a first microstructure for light convergence, and a second light modulation layer with a second microstructure for light deflection. This segmentation allows each layer to be optimized for its specific function, achieving precise light angle control that cannot be accomplished with a single layer, while keeping each individual layer relatively simple in structure.
3Use of energy by moving object
If microstructures with high refractive index are used to converge light, then light convergence efficiency improves, but the manufacturing complexity increases
Solution Approach 1:
The patent optimizes the refractive index parameter of the microstructure materials to achieve effective light convergence. By carefully selecting and tuning the refractive index values of the microstructure materials, the patent achieves high light convergence efficiency while maintaining manufacturability, avoiding the need for excessively complex fabrication processes that would be required with less optimized material parameters.
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
Enhances light utilization rate by effectively converging and deflecting light to match the receivable angles, reducing waste and improving overall light efficiency in virtual display apparatuses.
Implementation Method 1
a first light modulation layer having a first micro structure on a side closer to the light source... the first light modulation layer comprises a first base substrate and a plurality of first protrusions on the first base substrate; and a refractive index of the plurality of first protrusions is greater than a refractive index of the first base substrate
Implementation Method 2
a second light modulation layer having a second micro structure on a side away from the light source... the plurality of second protrusions are a plurality of ring protrusions surrounding a central region of the second light modulation layer... a refractive index of the plurality of ring protrusions is greater than a refractive index of the second base substrate
Data Source
AI summary
A light emitting substrate is provided. The light emitting substrate includes a light source; a first light modulation layer having a first micro structure on a side closer to the light source; and a second light modulation layer having a second micro structure on a side away from the light source.