Head-up display and operating method thereof
A head-up display includes an image generating unit and a waveguide glass. The waveguide glass faces toward the image generating unit. The waveguide glass includes a first microstructure, a second microstructure and a third microstructure. The first microstructure has a first width. The second microstructure is adjacent to the first microstructure. The third microstructure is adjacent to the second microstructure. The third microstructure has tiling areas adjacent to each other. A gap between the two adjacent tiling areas is less than half of the first width.
1. A head-up display, comprising:
an image generating unit; and
a waveguide glass facing toward the image generating unit, and the waveguide glass comprising:
a first microstructure having a first width;
a second microstructure adjacent to the first microstructure; and
a third microstructure adjacent to the second microstructure and having two tiling areas adjacent to each other, wherein a gap between the two adjacent tiling areas is less than half of the first width, and wherein the gap spatially separates the two adjacent tiling areas from each other.
2. The head-up display of claim 1 , wherein the first microstructure positionally corresponds to the second microstructure in a first direction.
3. The head-up display of claim 2 , wherein the second microstructure positionally corresponds to the third microstructure in a second direction perpendicular to the first direction.
4. The head-up display of claim 1 , wherein the first width of the first microstructure is in a range from 4 mm to 5 mm.
5. The head-up display of claim 1 , wherein the gap between the two adjacent tiling areas is in a range from 0.5 μm to 1.5 μm.
6. The head-up display of claim 1 , wherein one of the two tiling areas of the third microstructure has a plurality of protruding portions, and the protruding portions are aligned to each other.
7. The head-up display of claim 1 , wherein the second microstructure has a second width, and the second width is greater than the first width.
8. The head-up display of claim 7 , wherein the third microstructure has a third width, and the third width is the same as the second width.
9. The head-up display of claim 8 , wherein the third width of the third microstructure is in a range from 325 mm to 330 mm.
10. The head-up display of claim 1 , wherein the first microstructure has a first length, the second microstructure has a second length, and the first length is the same as the second length.
11. The head-up display of claim 10 , wherein the third microstructure has a third length, and the third length is greater than the second length.
12. The head-up display of claim 11 , wherein the third length of the third microstructure is in a range from 190 mm to 200 mm.
13. An operating method of a head-up display, comprising:
emitting a light to a first microstructure of a waveguide glass by an image generating unit;
transmitting the light to a second microstructure of the waveguide glass by the first microstructure of the waveguide glass, wherein the second microstructure is adjacent to the first microstructure; and
transmitting the light to a third microstructure of the waveguide glass by the second microstructure of the waveguide glass, wherein the third microstructure is adjacent to the second microstructure and has two tiling areas adjacent to each other, and a gap between the two adjacent tiling areas is less than half of a first width of the first microstructure, and wherein the gap spatially separates the two adjacent tiling areas from each other.
14. The method of claim 13 , wherein transmitting the light to the second microstructure by the first microstructure is performed such that the light is transmitted in a first direction.
15. The method of claim 14 , wherein transmitting the light to the third microstructure by the second microstructure is performed such that the light is transmitted in a second direction perpendicular to the first direction.