Abstract
Liquid crystal on-silicon (LCoS) display is one of the most representative micro-display technologies, and is widely adopted in virtual reality (VR) and augmented reality (AR) devices thanks to a relatively simple structure using a semiconductor manufacturing process to realize high-resolution displays. However, the structural complexity to handle color frames by field sequential color (FSC) scheme hinders more widespread adoptions of the LCoS displays. In this article, to resolve the problem, we propose a novel FSC driver architecture using resistive random access memory (ReRAM) that diminishes the driver’s structural complexity with matrix-vector multiplications. The proposed architecture leverages fast matrix-vector multiplications with a memristor crossbar array to expedite the FSC operation that extracts the individual red, green, and blue color sub-frames from an entire image. We present the hardware performance of our architecture that is implemented using the crossbar array and peripheral circuits. Compared to the conventional static random access memory (SRAM)-based architecture, we confirm that the proposed design is much superior in terms of chip size, leakage power, and frame rate in various image resolutions. Specifically, the chip size and leakage power are reduced by up to 96% and 99%, respectively, and the frame rate is improved by up to 36%. We also analyze image quality loss caused by ReRAM read and write noise.
Highlights
R ECENTLY, as virtual reality (VR) and augmented reality (AR) technologies become more popular, a micro-display technology for wearable glasses is being spotlighted [1]–[4]
We propose a novel field sequential color (FSC) driver architecture using resistive random access memory (ReRAM)’s crossbar structure to reduce the structural complexity of the liquid crystal on-silicon (LCoS) micro-displays
To demonstrate the superiority of our proposed FSC driver in terms of chip size, power consumption, throughput, i.e., frame rate, and endurance, we evaluate the performance of the FSC drivers for LCoS micro-displays with standard definition (SD), high definition (HD), full high definition (FHD), and ultra high definition (UHD) resolutions
Summary
R ECENTLY, as virtual reality (VR) and augmented reality (AR) technologies become more popular, a micro-display technology for wearable glasses is being spotlighted [1]–[4]. The LCoS display constructs a single red, green, and blue (RGB) color frame by using the field sequential color (FSC) scheme to overlap three individual red, green, and blue color sub-frames sequentially [19]–[22] This approach is completely different from those of other display technologies, including OLED, LCD, and micro LED, that illuminate the RGB color lights at each pixel of the displays. We propose a novel FSC driver architecture using resistive random access memory (ReRAM)’s crossbar structure to reduce the structural complexity of the LCoS micro-displays. We present a ReRAM-based FSC driver architecture for LCoS micro-displays and its implementation details, including memristor crossbar organization and peripheral circuits.
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