Display device with translucent background panel

1. A display device, comprising:

a first light source that emits light;

a background panel including a translucent portion to which light emitted from the first light source is entered and from which transmitted light is exited, the translucent portion provided in at least a portion of the background panel;

a dial including a transparent portion to which at least a portion of the transmitted light exited from the translucent portion is entered, the transparent portion provided in at least a portion of the dial;

the background panel being located between the first light source and the dial.

2. The display device according to claim 1 , further comprising:

a second light source that emits light having different wavelength from the light emitted from the first light source;

wherein the light emitted from the second light source is entered to the transparent portion of the dial.

3. The display device according to claim 2 , further comprising:

a first prism for guiding the light emitted from the first light source to the translucent portion of the background panel; and

a second prism for guiding the light emitted from the second light source to the transparent portion of the dial.

4. The display device according to claim 3 , further comprising:

a case to which the first prism and the second prism are fixed, wherein the background panel is sandwiched between the first prism and the second prism.

5. The display device according to claim 1 , wherein at least one of a surface of the translucent portion of the background panel to which light emitted from the first light source is entered and another surface of the translucent portion of the background panel from which the transmitted light is exited is provided with at least one of a gradation print and a smoke print.

6. The display device according to claim 3 , wherein:

the transparent portion of the dial has an opening corresponding to various types of pieces of information to be displayed on the dial;

the second prism has a projection that projects from the dial through the opening; and

the projection emits at least a portion of the light emitted from the second light source.

7. The display device according to claim 6 , wherein a color layer for permitting transmission of light having a predetermined wavelength is provided on at least a portion of a side surface of the projection that projects from the dial.

8. The display device according to claim 2 , further comprising a prism for guiding the light emitted from the second light source to the transparent portion of the dial, wherein the prism is located between the background panel and the dial.

9. The display device according to claim 1 , further comprising:

a second light source that emits light, wherein the light emitted from the second light source is entered to the transparent portion of the dial;

a first prism for guiding the light emitted from the first light source to the translucent portion of the background panel; and

a second prism for guiding the light emitted from the second light source to the transparent portion of the dial;

wherein the background panel is sandwiched between the first prism and the second prism.

10. The display device according to claim 1 , wherein the background panel is a plate member formed of a translucent material.

11. The display device according to claim 10 , wherein the background plate is formed in a circular-arc shape.

12. The display device according to claim 11 , wherein the background plate includes a light shielding portion and the translucent portion.