Abstract
In this paper we present a resolution-enhanced system for digital micromirror device (DMD) projected images by utilizing time multiplexing and birefringence in order to achieve this with static components only. This provides a less expensive solution than reducing the size of the hardware pixels and can also be applied to higher resolution displays, as and when, these become available. Birefringent materials have different refractive indices for linearly polarized light with orthogonal polarization directions. A high-resolution projected image can be observed by overlapping two or three native resolution images at shifts of one half or one third of a DMD pixel diagonal respectively on successive frames. The optical components comprise a custom-made quartz plate as the birefringent component and an off-the-shelf twisted nematic liquid crystal display (TN-LCD) screen as a polarization rotator that is synchronized with the DMD frame rate. This paper covers the principle of operation and the system design. The functioning of the display is verified using enlarged images of the letter `R' and a checkerboard pattern that are formed from a small number of DMD pixels.
Highlights
In the display field, pixels are the units that carry information, and higher resolution means that a larger number of pixels can be displayed, which means that a larger amount and denser data display becomes possible
Virtual reality (VR) and augmented reality (AR) displays with their requirement for a large field of view can suffer from insufficient display panel resolution and may show the
We use a laser as the illumination source, a twisted nematic-liquid crystal display (TN-LCD) screen as the light polarization rotator device and a field programmable gate array (FPGA) circuit to drive the twisted nematic liquid crystal display (TN-LCD) screen in synchronism with the digital micromirror device (DMD)
Summary
Pixels are the units that carry information, and higher resolution means that a larger number of pixels can be displayed, which means that a larger amount and denser data display becomes possible. In [8], a compact active static component is proposed to address the accommodation–convergence conflict problem and enhance image resolution in a light field near eye display by using a birefringent plate and a twisted nematic switch cell. We were inspired by techniques from related research [7] to complete a digital micromirror device (DMD) projection display system that can achieve resolution multiplication, but without using any moving parts. In this system, we use a laser as the illumination source, a twisted nematic-liquid crystal display (TN-LCD) screen as the light polarization rotator device and a field programmable gate array (FPGA) circuit to drive the TN-LCD screen in synchronism with the DMD. By these characteristics of the human eye, time multiplexing [4], [11], [21] can be realized
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