Micro-lens Array Pitch and Scanning for Display Resolution
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Solution Overview
Problem
Display apparatuses that project light rays onto a projection target object, such as a screen or retina, face challenges in increasing image resolution due to diffraction effects, which limit the ability to provide high-quality images with high resolution, wide viewing angle, high dynamic range, and wide color gamut.
Innovation Solution
A display apparatus comprising a light-emitting device, a micro-lens array with lenses arranged at a pitch larger than the pixel pitch, and a scanning mechanism to project diffuse light rays onto specific reaching positions on the projection target, enhancing the focusing degree and resolution of the projected image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If light rays are projected directly from light-emitting pixels onto the projection target object, then the device structure is simple, but the image resolution is low due to diffraction effects
Solution Approach 1:
A micro-lens array is introduced as an intermediary component between the light-emitting device and the projection target object. Each lens in the micro-lens array corresponds to a light-emitting pixel and focuses the emitted light rays onto a specific reaching position on the projection target, thereby improving image resolution while maintaining a relatively simple device structure
Solution Approach 2:
The micro-lens array divides the optical system into multiple independent focusing units, with each lens handling a specific light-emitting pixel. This segmentation allows precise control of light rays from each pixel, reducing diffraction effects and improving overall image resolution
2Area of stationary object
If the micro-lens array uses the same pitch as the light-emitting pixel pitch, then the structure is compact, but the focusing degree is insufficient and resolution is limited
Solution Approach 1:
The pitch of the micro-lens array is changed to be larger than the pitch of the light-emitting pixels. This parameter change allows each lens to effectively focus light rays from its corresponding pixel with greater focusing degree, improving resolution while maintaining a compact overall structure
3Manufacturing precision
If a scanning mechanism is added to improve resolution, then the image quality is enhanced, but the device complexity increases
Solution Approach 1:
The micro-lens array is designed to serve multiple functions: it focuses light rays from each light-emitting pixel, defines reaching positions on the projection target, and works in conjunction with the scanning mechanism to achieve high-resolution imaging. This multi-functionality reduces the need for additional specialized components, thereby limiting the increase in device complexity
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 effectively improves the resolution of projected images by increasing the focusing power of light rays onto the projection target, enabling higher resolution and better image quality with fewer components and a more compact design.
Implementation Method 1
light rays expanded due to an influence of diffraction are projected onto the projection target object, which prevents an increase in image resolution
Implementation Method 2
a micro-lens array includes a plurality of lenses that projects the diffuse light rays emitted respectively from the first light-emitting pixel and the second light-emitting pixel
Data Source
AI summary
[Object] To provide a display apparatus that displays a projection image with an improved resolution.[Solving Means] A display apparatus (10) includes a light-emitting device (13), a micro-lens array (5), and a scanning mechanism (54). The light-emitting device (13) includes a plurality of first light-emitting pixels and a plurality of second light-emitting pixels. The micro-lens array (5) includes a plurality of lenses (53) that projects the diffuse light rays emitted respectively from the first light-emitting pixel and the second light-emitting pixel, which have been made incident, to a first reaching position and a second reaching position located at desired different positions of a projection target object (3), respectively, the plurality of lenses being arranged at a pitch larger than a pixel pitch of the light-emitting pixels. The scanning mechanism (54) projects the diffuse light ray emitted from the first light-emitting pixel to the first reaching position via the micro-lens array (5) and then projects the diffuse light ray emitted from the second light-emitting pixel to the second reaching position via the micro-lens array (5).