Abstract: An optical device and a wearable image display device are provided with a light guiding plate, a plurality of half mirrors, and an incident angle adjustment member. The optical member that causes the video light to be incident as a virtual image on a person's eye and be displayed as a display image, and has a reflection characteristic that a part of the video light is reflected on a back surface thereof. The incident angle adjustment member is an optical member configured to adjust the incident angle of the video light according to the reflection characteristic of the half mirror to form video light that does not satisfy a total reflection condition in another part of the video light, to balance the brightness of the display image.

Abstract: In order to allow easy maintenance and convenient usage, the present invention is provided with an image light output unit, an image light transmitting unit, and an image light emitting unit. The image light output unit and a portion of the image light transmitting unit constitute an image source-side section. The remainder of the image light transmitting unit and the image light emitting unit constitute an image display-side section. The image source-side section and the image display-side section are respectively divided into separate unit structures. As a result, the present invention allows for easy maintenance and convenient usage.

Abstract: A wearable image display device eliminates the need to adjust an image focus every time the device is used. The present invention includes a mounting module and a right image display module, and a left image display module. Each of the right image display module, the left image display module includes a reflective image modulation device, a lens, a light guide plate, and a plurality of half mirrors. The lens is disposed in a state eccentric to a predetermined value with respect to the reflective image modulation device. As a result, the present invention eliminates the need to adjust the image focus every time the device is used.