CPU-Embedded 6000 × 4500 OLED/OS/Si Display Capable of Driving at 231.5 Hz With Reduced Bandwidth Using Foveated Rendering

Abstract

In this study, we design a high-resolution, high-frame-rate micro organic light-emitting diode (OLED) display tailored for virtual reality (VR) systems. Our OLED/oxide semiconductor/Si structure allows display drivers to control resolutions individually (per independently addressable 750 × 750 pixel array) and implement foveated rendering (FR). This approach reduces the data volume and bandwidth for one frame. Furthermore, the integration of a central processing unit (CPU) and temperature sensors enables internal processing such as logic parameter control and temperature-dependent management. Measurement results demonstrate stable operation of the CPU-embedded OLED display with a resolution of 6000 × 4500 at a frame rate of 231.5 Hz with FR. This frame rate requires a bandwidth of 150.1 gigabits per second (Gbps) in conventional driving mode (Normal mode), where all frame data are transferred as high-resolution data, but is achieved with a significantly reduced bandwidth of 38.9 Gbps in our FR mode, representing an approximately 74% reduction. This achievement suggests that the proposed FR mode may mitigate the bandwidth bottleneck (over 150 Gbps) for future VR devices requiring a resolution of 8K × 8K, a color depth of 30 bits per pixel (bpp), and a frame rate of 90 Hz. This study contributes to the development of high-resolution, high-frame-rate micro OLED displays that meet the demands of next-generation VR systems.