Light Modulation Substrate for Wide Viewing Angle 3D Displays
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Solution Overview
Problem
Existing 3D display devices have limited viewing angles due to the use of transmissive gratings on high refractive index substrates like glass, which restricts processing technology and material selection, leading to small viewing angles and increased fabrication complexity and cost.
Innovation Solution
A display device with a light modulation substrate comprising a base layer and a transparent dielectric layer, where the base layer has reflective gratings and the transparent dielectric layer with a refractive index greater than 1, allowing for large viewing angles by adjusting the refractive index to control the exit angle of outgoing light, thereby increasing the viewing angle without the need for etching on glass substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If transmissive gratings are used on high refractive index glass substrates, then light direction can be modulated, but viewing angle is limited to approximately 90°
Solution Approach 1:
The patent changes the refractive index parameter of the substrate from high (glass, n>1.5) to low (n<1.4), which fundamentally alters the light modulation characteristics and enables wider viewing angles. This parameter change allows the grating structure to achieve the same light direction control function while expanding the angular range to at least 180°.
Solution Approach 2:
The patent creates a simplified copy of the grating structure by forming it directly on the low refractive index substrate through photolithography and etching, eliminating the need for complex etching processes on glass substrates. This copied structure achieves the same light modulation function with reduced fabrication complexity.
2Illumination intensity
If transmissive gratings are etched on glass substrates, then light modulation is achieved, but fabrication complexity and cost increase
Solution Approach 1:
The patent replaces expensive, difficult-to-process glass substrates with cheaper, easier-to-manufacture low refractive index substrates. The simplified substrate allows for easier etching and grating formation, reducing both fabrication complexity and cost while maintaining the light modulation function.
Solution Approach 2:
By changing the substrate material parameter (refractive index from high to low), the patent enables simpler fabrication processes. The low refractive index substrate can be processed with standard photolithography and etching techniques, eliminating the need for complex glass etching procedures.
3Extent of automation
If transmissive gratings on glass substrates are used, then 3D display function is achieved, but material selection and processing technology are limited
Solution Approach 1:
The patent makes the substrate universally applicable by choosing a low refractive index material that can be easily processed and integrated with various grating structures. This universal substrate platform enables the same basic design to work with different materials and processing methods, increasing adaptability across different manufacturing approaches.
Solution Approach 2:
The patent changes the fundamental material parameter from high refractive index glass to low refractive index materials, which expands the range of suitable materials and processing technologies. This parameter change enables the use of simpler, more versatile manufacturing processes while maintaining the 3D display function.
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 enables a wide viewing angle display device with reduced fabrication complexity and cost, providing a real sense of depth with suppressed eye fatigue and crosstalk, while allowing for higher resolution 3D images by converging light to multiple points outside the device.
Implementation Method 1
The transparent dielectric layer has a refractive index of n, and n>1. Outgoing light of the display device converges to a plurality of light-emitting points outside the display device.
Data Source
AI summary
A display panel is provided. The display panel comprises a display panel; and a light modulation substrate disposed opposite to the display panel. The light modulation substrate includes a base layer and a transparent dielectric layer covering the base layer. The base layer has a first surface facing the display panel and an opposing second surface, and the transparent dielectric layer is disposed on the first surface of the base layer. A plurality of reflective gratings are disposed on the base layer. The transparent dielectric layer has a first surface facing the base layer and an opposing second surface, and the second surface of the transparent dielectric layer is a transparent dielectric layer surface. The transparent dielectric layer has a refractive index of n, and n>1. Outgoing light of the display device converges to a plurality of light-emitting points outside the display device.