Lg Electronics Inc.

Oh Jin Kweon

Seung Gyu Lee

Ho Joong Kang

Sang Sik Jeong

A projection display device () capable of providing a virtual keyboard function to the user, using a light source of a pico projector, is discussed. According to an embodiment, the projection display device includes a light source unit () configured to emit lights; a light combining unit () configured to generate a leakage light from the lights emitted by the light source () unit and to selectively combine the lights from the light source unit (); an image projection unit () configured to project an image using the combined light from the light combining unit (); and a virtual input unit () configured to project an input unit image () using the leakage light from the light combining unit ().

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Seoul, South Korea

Oh Jin Kweon