| 摘要 |
There is disclosed an apparatus having a display zone, such as a liquid crystal screen ( 4 ), and including an optical device for forming a decorative pattern in the form of a figurative image. The optical device for forming a figurative image includes an optical guide ( 1 ), at least partially superposed onto the display zone ( 4 ) and having two large faces ( 10, 11 ) and one lateral face ( 12 ). Optical extractors ( 20 ) each having at least one surface ( 21 ) for reflecting light are arranged in a first group in at least one of the large faces ( 11 ). A light source ( 8, 8 a, 8 b, 8 c, 8 d) is arranged so as to emit light in the direction of the reflective surfaces ( 21 ) via the lateral face ( 12 ) of the optical guide. Thus, each of the reflective surfaces causes a reflected light beam to be formed in a well defined direction, the set of the light beams forming a figurative image in that direction, which can typically be chosen to be the normal in relation to the mid-plane of the optical guide. The optical guide according to the present invention is further provided with a second group of optical extractors having a predefined position in relation to the display zone ( 4 ), for illuminating the latter, possibly in relation to the same light source as the first group of optical extractors.
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