Electro-optical device having optical element including a plurality of light guiding materials bonded via a half mirror layer

An electro-optical device, comprising:

• a light source which generates light including light beams, the light beams having various angle components;
• and
• a first optical element that includes a plurality of light guiding materials, the plurality of light guiding materials are bonded to each other via a half mirror layer,
• wherein
• the first optical element includes a first surface, a second surface, an incident surface, and an emitting surface, which are each exterior surfaces of the first optical element,
• the first surface is formed so as to be parallel to the half mirror layer,
• the second surface is formed so as to be parallel to the first surface,
• the incident surface is formed so as to intersect the first surface at a first angle,
• the emitting surface is formed so as to intersect the first surface at a second angle, at a position opposite to the incident surface,
• the light source is disposed so that the light beams are incident on the incident surface of the first optical element,
• a first part of the light is a light incident from the incident surface that is guided to and reflected by the second surface and is incident on the emitting surface,
• the first optical element is formed so that the first part of the light is reflected by the emitting surface such that the first part of the light does not pass through the emitting surface, and
• the incident surface does not intersect the emitting surface and extends in a different direction than the emitting surface.