32‐1: Invited Paper: Review of Micro‐light‐emitting‐diode Technology for Micro‐display Applications

Abstract

In this paper, some of the technological bottlenecks of the microlight-emitting diode (μLED) for a micro-display were reviewed. Although there remain other issues, the μLED technology has a potential for some micro-display applications which especially demand high brightness and reliability such as augmented reality (AR) display, automotive head-up display (HUD), and so on. The efficiency of μLED needs to be improved, and an integration technology for active matrix driving and technologies for full-color realization as well as defective pixel control must be developed. An optimum specification of a μLED display was proposed to maximize reality in micro-display products.

Prospects and challenges of mini‐LED, OLED, and micro‐LED displays

“…138 The peak EQE of RGB LEDs as a function of chip size is plotted in Figure 12A. 139,140 Based on Equation 8, a larger LED chip size with higher EQE is helpful to enhance the power efficiency. However, as discussed above, the larger LED chip size results in a stronger ambient luminous reflectance so that a higher luminance is required to maintain the same ACR.…”

Micro‐Light Emitting Diode: From Chips to Applications

“…Recently, micro‐LED display research has received considerable interest because of its excellent characteristics, such as high luminous efficacy, fast response time, low power consumption, wide operation temperature, high water‐oxygen resistance, and long lifetime. [ 16,70,77,107–111 ] The advantages and disadvantages of these competing technologies are summarized in Table 5 . Although there are still challenging issues to overcome, significant progress in the technology of micro‐LED‐based display has been made (Table 5 and references therein).…”

“…[ 73 ] In 2017, monochromic blue‐color 4k microdisplays (a few millimeter) (6000 PPI) for AR (e.g., head‐mounted display (HMD) or head‐up display (HUD)) were demonstrated, but detailed integration and fabrication processes were not presented. [ 111 ]…”

Low Forward Voltage III-Nitride Red Micro-Light-Emitting Diodes on a Strain Relaxed Template with an InGaN Decomposition Layer

“…Due to the rapid advancements in micro-light-emitting diodes (µLEDs) for nextgeneration display applications, significant research attention has been devoted to develop full-color µLED displays [1][2][3]. Moreover, monolithic III-nitride-based µLEDs are especially interesting for near-eye display applications, since this approach offers advantages in terms of fabrication and mass transfer [4][5][6].…”