5009‐ppi, 10000‐cd/m2, OLED/OS/Si structure display with built‐in CPU and display driver

Abstract This study developed an organic light‐emitting diode display featuring c‐axis‐aligned crystalline oxide semiconductor (CAAC‐OS) field‐effect transistors (FETs) monolithically stacked over silicon (Si) FETs. This display achieved a definition of 5,009 ppi and a luminance of 10,000 cd/m 2 . Below the display pixels incorporating CAAC‐OS FETs, both source and scan drivers and a central processing unit (CPU; Cortex‐M0) were integrated using Si FETs without widening the bezel. The findings indicate that the built‐in CPU enables amplifier offset compensation, which is necessary for image quality correction, and that functional circuits beyond the display driver can operate on a Si substrate.