Abstract: 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, 8a, 8b, 8c, 8d) 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.

Abstract: A light source (15) is housed in a housing (6) of a case, underneath the dial (10) opposite a guide (17) directing the light onto a reflector (20), formed in a hollow in the internal or external face of a crystal (1) the thickness of which decreases regularly from the center to the periphery thereof for reorienting the light by total internal reflection into the crystal (1) until it emerges towards the dial (10) when the maximum refractive index is exceeded.

Abstract: 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, 8a, 8b, 8c, 8d) 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.

Abstract: The device consists in compensating for the distortion of the characters marked on the dial caused by a lens, by writing the characters with a reverse pin cushion or barrel distortion.

Abstract: A light source (15) is housed in a housing (6) of a case, underneath the dial (10) opposite a guide (17) directing the light onto a reflector (20), formed in a hollow in the internal or external face of a crystal (1) the thickness of which decreases regularly from the centre to the periphery thereof for reorienting the light by total internal reflection into the crystal (1) until it emerges towards the dial (10) when the maximum refractive index is exceeded.