Abstract: A dial, and timepiece including the dial, including a mother-of-pearl wafer partially covering a support member, and a decorative element arranged on a reverse of the wafer, the decorative element being visible on an obverse of the wafer when subjected to a stimulus and invisible on the obverse of the wafer in the absence of the stimulus. The decorative element has a first empty area on a reverse of the wafer, and a second empty area on the obverse of the wafer, facing the first empty area. A colour compensation layer is deposited on the first empty area or the second empty area, the colour being selected such that the difference in colour ?E in the CIE Lab colour space between the colour compensation layer and the decorative element in the absence of said stimulus, perceived by a user observing the obverse of the wafer, is less than 3.

Abstract: A method for the fine adjustment of the rate of a mechanical oscillator with an oscillating inertial mass, equipped, in a first step, with an actuator made of material suitable for irreversible local micro-expansion under the action of laser fires, to impart to an inertia-block a radial travel during suitable laser fires on a writing zone of the actuator, in a second step, the initial rate of the oscillator is set and measured, in a third step, the direction and the value of the deviation required to achieve a predetermined rate range, and of the travel to be imparted to inertia-blocks are calculated, in a fourth step, a writing zone is subjected to femtosecond laser fires to create expansion lines by local molecular expansion to radially deform the actuator, in a fifth step the rate is measured and the third step and fourth step are repeated if required.

Abstract: A display device for a portable object wherein the portable object includes a dial and at least one movable hand, at least one movable hand includes a light source or is coupled to a light source, the dial includes at least one secondary light waveguide, the light source and the secondary waveguide being arranged such that the light source is coupled to the proximal end of the secondary waveguide when the movable hand moves into a predetermined sector of the dial, and the distal end of the secondary waveguide being coupled to a display element of the dial.

Abstract: A dial including a mother-of-pearl wafer partially covering a support member, and a decorative element arranged on a reverse of the wafer, the decorative element being visible on an obverse of the wafer when subjected to a stimulus and invisible on the obverse of the wafer in the absence of the stimulus. The decorative element has a first empty area on a reverse of the wafer, and a second empty area on the obverse of the wafer, facing the first empty area. A colour compensation layer is deposited on the first empty area or the second empty area, the colour being selected such that the difference in colour ?E in the CIE Lab colour space between the colour compensation layer and the decorative element in the absence of said stimulus, perceived by a user observing the obverse of the wafer, is less than 3. Also, a timepiece including the dial.

Abstract: A display device for a portable object wherein the portable object includes a dial and at least one movable hand, at least one movable hand includes a light source or is coupled to a light source, the dial includes at least one secondary light waveguide, the light source and the secondary waveguide being arranged such that the light source is coupled to the proximal end of the secondary waveguide when the movable hand moves into a predetermined sector of the dial, and the distal end of the secondary waveguide being coupled to a display element of the dial.