Optical sheet controlling external light, display device and method for producing optical sheet

An optical sheet disposed on an observer side relative to an image light source comprising:

• a plurality of layers that control light emitted from the image light source to emit the light on the observer side,
• wherein at least one of the plurality of layers is an optical functional sheet layer, which comprises prisms being arranged in parallel along a surface of the optical sheet whereby light is transmitted and wedge portions being arranged in parallel between the prisms whereby a part of visible light is absorbed;
• at least one of the plurality of layers other than the optical functional sheet layer is a light-absorbing layer capable of absorbing light all over the light-absorbing layer, and is capable of absorbing the part of visible light;
• and the light-absorbing layer and the wedge portions of the optical functional sheet layer absorb a same wavelength of light.