What is the Microdisplay? OLED, LCOS, LCD, Micro-OLED Introduction

microdisplay application

A microdisplay is a miniaturized display unit with a miniature size, also known as a miniature flat display panel. Usually refers to a display with a diagonal size of less than 2 inches (5 cm). There are various micro-display techology, but the mainstream technologies are liquid crystal on silicon (LCOS), liquid crystal display (LCD), digital micromirror device (DMD), digital light processing (DLP), OLED on silicon (OLEDOS), Micro LED, etc.

Types of Microdisplays
Projecting a Microdisplay: The image of a microdisplay is enlarged and projected onto a flat surface. Projection microdisplays include rear-projection televisions and compact data projectors.

Near-Eye Display (NED): Presents a highly magnified virtual image for viewing through an eyepiece such as a virtual reality headset or camera viewfinder. Such displays are increasingly used in HMDs and HUDs, especially in the military and medical industries.

Application of Microdisplays

Because microdisplays are usually small in size and light in weight, but the resolution can be relatively freely, this determines their use in applications that require a small screen footprint, such as head-mounted displays and digital cameras, projectors, sights, wearable displays ( HMD), Head-Up Display (HUD) and Electronic Viewfinder (EVF).

  • EVF for Medical Equipment
  • EVF for Video Camera
  • EVF for Professional Camera
  • EVF for Consumer Camera
  • First Person View Goggles
  • Electronic Monocular
  • Electronic Binocular
  • AR Glasses
  • VR Glasses

microdisplay application

The Pros and Cons of OLED, LCOS, LCD, MicroLED

LCD (Liquid Crystal Display), that is, liquid crystal display. The LED display refers to a kind of liquid crystal display (LCD), that is, a liquid crystal display with LED (light-emitting diode) as the backlight source.

OLED (OrganicLight-Emitting Diode) an organic light-emitting diode (OLED or organic LED), also known as organic electro-luminescent (organic EL) diode.

LCOS (Liquid Crystal on Silicon) is a reflective new display technology that organically combines LCD and CMOS integrated circuits. Its structure is on the silicon wafer, using the semiconductor process to make the driving panel, and then grinding the transistor on the ground through grinding technology, and plating aluminum as a mirror to form a CMOS substrate, and then the CMOS substrate and the TO conductive glass upper substrate Bonding, then inject liquid crystal, and conduct packaging test.

Micro-OLED microdisplay device uses a single crystal silicon wafer (Wafer) as the backplane, which has the characteristics of self-illumination, thin thickness, light weight, large viewing angle, short response time, high luminous efficiency, etc., and it is easier to achieve high PPI (pixel density), small size, easy to carry, low power consumption and other excellent characteristics, especially suitable for AR/VR display devices such as helmet-mounted displays, stereoscopic display mirrors, and glasses-type displays.

Micro LED (also known as μLed), is self-illuminating. LED chips with three luminous colors of RGB are used to form pixels for display. Micro LED display has fast response speed, high brightness, large viewing angle, and color effect, long prolife, small size, light and thin, and can also achieve energy saving effect.

Technology Technology Principle Pros Cons
LCOS Reflective LCD Small size, low cost, high resolution, wide color gamut, high light utilization, Slow response time, high power consumption, low contrast
LCD Transmissive LCD Mature technology, low cost, high color gamut, long prolife High power consumption, low contrast, low light utilization
OLED/Micro-OLED Self-luminous Fast response time, low power consumption, richer color effects, good ductility, wide operating temperature range, high integration, small size, easy to carry, high contrast Low brightness, high cost, average lifespan, average luminous rate
Micro-LED Self-luminous High resolution, high brightness, high contrast, high color saturation and low power consumption, fast response time, thin thickness, long prolife High cost, complex technology, difficult mass production


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