Provided is a watch glass configured to be disposed on a watch dial with indications. This watch dial comprises at least one indication, a first chamber configured to let a first mobile element circulate, a second chamber configured to comprise a second mobile element and a separation wall separating the chambers and large enough to obtain from the indications of the dial an enlarged image.

A display system for a timepiece is disclosed. The system includes a mobile arranged to be driven by a drive source by first teeth provided on the mobile. The mobile includes second teeth including a teeth module of less than 0.05 mm, the second teeth being arranged so as to drive a display member either directly or indirectly.

A timepiece glass, in particular a watch glass, wherein it comprises an optical device comprising at least one lens intended to enlarge an indication supplied by a timepiece, said lens comprising at least one aspherical face comprising at least one section passing through a vertical plane comprising an optical axis of vertical direction z, of which at least one outline can be defined by the following equation: $z\left(r\right)=\frac{r^2}{R\left(1+\sqrt{1-\left(1-\kappa \right)\frac{r^2}{R^2}}\right)}+{\alpha }_4{r}^4+{\alpha }_6{r}^6+\mathrm{.Math.}$
in which R is the nominal radius of curvature, k is the constant of conicity, and α.sub.(4,6, . . . ) is or are coefficient(s) of asphericity, and in which at least the constant of conicity k and/or at least one coefficient of asphericity is different from zero.

A crystal/glass or screen of an apparatus intended to display an information visible to a user includes on its outer surface a transparent protective film with a convex outer surface, constituting a lens in order to facilitate reading. The transparent protective film constituting a lens is a layer (2) of transparent sapphire glass material having an anti-scratch surface. This layer (2) includes a convex outer surface forming a lens and an inner surface carrying a transparent repositionable glue film (4) by which said layer (2) can be removably glued to the outer surface of the crystal or of the screen (1).

A timepiece glass, in particular a watch glass, wherein it comprises an optical device comprising at least one lens intended to enlarge an indication supplied by a timepiece, said lens comprising at least one aspherical face comprising at least one section passing through a vertical plane comprising an optical axis of vertical direction z, of which at least one outline can be defined by the following equation:

[00001]$z\left(r\right)=\frac{r^2}{R\left(1+\sqrt{1-\left(1-\right).Math..Math.\frac{r^2}{R^2}}\right)}+{}_4.Math.r^4+{}_6.Math.r^6+\mathrm{.Math.}$

in which R is the nominal radius of curvature, k is the constant of conicity, and .sub.(4,6, . . . ) is or are coefficient(s) of asphericity, and in which at least the constant of conicity k and/or at least one coefficient of asphericity is different from zero.

The invention relates to a display system for a timepiece, said system comprising a mobile arranged to be driven by a drive source by means of first teeth provided on the mobile. According to the invention, the mobile comprises at least second teeth including a teeth module of less than 0.05 mm, said second teeth being arranged so as to drive a display member either directly or indirectly.

Disclosed are a display and an electronic device including the display, which includes a panel device outputting a specified image using a power applied thereto and an external protective layer having a specified transparency and disposed on the panel device to protect the panel layer. The external protective layer is provided such that a thickness of a center portion of an upper portion surface is greater than a thickness of a peripheral portion, and the panel device includes a panel layer outputting the specified image in response to the power applied thereto and an adhesive layer adhering the panel layer to a lower portion of the external protective layer. Other various embodiments identified in the specification are also possible.

A crystal/glass or screen of an apparatus intended to display an information visible to a user includes on its outer surface a transparent protective film with a convex outer surface, constituting a lens in order to facilitate reading. The transparent protective film constituting a lens is a layer (2) of transparent sapphire glass material having an anti-scratch surface. This layer (2) includes a convex outer surface forming a lens and an inner surface carrying a transparent repositionable glue film (4) by which said layer (2) can be removably glued to the outer surface of the crystal or of the screen (1).