Eyepiece Optical System for High Pixel Displays
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Solution Overview
Problem
Existing eyepiece optical systems struggle to match the increasing pixel count and display screen size of modern digital devices, often resulting in narrow viewing angles and suboptimal performance.
Innovation Solution
A compact eyepiece optical system composed of three lenses with specific refractive power configurations and shapes, including a first lens with a convex surface on the eye side, a second lens with a concave surface on the object side, and a third lens with a biconvex shape, optimized to satisfy conditional expressions for refractive index, focal length ratios, and viewing angles, ensuring a wide viewing angle and high optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing eyepiece optical systems are used, then they can match small display elements, but they cannot match higher pixel count and larger display screen size
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive indices of the three lenses (Nd1=1.80-2.00, Nd2=1.70-1.90, Nd3=1.75-1.95) and their focal length ratios (0.30<f1/f<0.70, 0.50<f2/f<0.90, 0.60<f3/f<0.90) to achieve both adaptability to high pixel count displays and high optical performance with reduced field curvature
Solution Approach 2:
The patent introduces dynamic adaptability by designing an optical system that can accommodate varying display element specifications through optimized lens parameters, allowing the system to adapt to different pixel counts and screen sizes while maintaining image quality
2Area of stationary object
If eyepiece optical system with large display screen size is used, then it can match large display elements, but it has large field curvature and cannot be said to have high performance
Solution Approach 1:
The patent uses composite material principles by combining three lenses with different refractive index ranges (Nd1=1.80-2.00, Nd2=1.70-1.90, Nd3=1.75-1.95) to create a composite optical system that corrects field curvature while supporting large display screen sizes
Solution Approach 2:
The patent applies local quality by assigning different refractive index characteristics to each lens position: the first lens (positive power) has higher refractive index for convergence, the second lens (negative power) has intermediate index for divergence, and the third lens (positive power) has specific index for field flattening, optimizing local optical properties throughout the system
3Volume of moving object
If compact eyepiece optical system is used, then it can be downsized, but it has narrow viewing angle
Solution Approach 1:
The patent applies dimensionality change by optimizing the focal length ratios between lenses (0.30<f1/f<0.70, 0.50<f2/f<0.90, 0.60<f3/f<0.90) to expand the viewing angle in the angular dimension while maintaining compact physical dimensions, achieving wide viewing angle (ω≥30°) in a downsized configuration
Solution Approach 2:
The patent uses curvature principles by designing lenses with specific radius of curvature relationships (|R3r|<|R3f| for the third lens) to broaden the viewing angle while keeping the optical system compact, utilizing spherical and aspherical surface curvatures to expand light acceptance angles
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 compact configuration with a sufficiently wide viewing angle and high optical performance, capable of matching higher pixel counts, while maintaining a compact design suitable for modern digital devices.
Implementation Method 1
a first lens L1 having a positive refractive power with a convex surface on the eye point side
Implementation Method 2
a second lens L2 having a negative refractive power with a concave surface on the object side
Implementation Method 3
a third lens L3 having a positive refractive power with an absolute value of radius of curvature of the eye point side surface being smaller than an absolute value of radius of curvature of the object side surface
Data Source
AI summary
An eyepiece optical system substantially composed of a first lens having a positive refractive power with a convex surface on the eye point side, a second lens having a negative refractive power with a concave surface on the object side, and a third lens having a positive refractive power with an absolute value of radius of curvature of the eye point side surface being smaller than an absolute value of radius of curvature of the object side surface, disposed in order from the object side. The first lens to the third lens are all single lenses and, when the average refractive index of the first lens to the third lens is taken as NdH, the eyepiece optical system satisfies a conditional expression (1): 1.80<NdH.