Shield for helmet comprising first and second wireless modules and an angular position sensor, helmet, and head-up display device
A shield for a helmet is provided and the shield is served as a projection screen for a head-up display device. The shield includes an object lens, and an ocular lens. The ocular lens is positioned above the object lens. The object lens reflects an image displayed on the head-up display device at a front-bottom of the helmet, the image being reflected by the object lens and then projected to the ocular lens, after that, the image is reflected by the ocular lens to rear of the ocular lens. The aforementioned arrangement reduces electronic components attached to the helmet and further provides an embodiment in regard to the head-up display device and a head-up display system for the helmet.
1 . A head-up display device, suitable for constructing on a mobile vehicle and connecting to a first wireless module of a helmet, the helmet comprising a shield and an angular position sensor for determining an angle value of the helmet, the head-up display device comprising:
a second wireless module, receiving the angle value of the helmet from the first wireless module;
a display module, selecting a high brightness mode or a low brightness mode based on the angle value and projecting an image to the shield of the helmet;
wherein, when the angle value maintains within an angle range which is responded to a head up position, the display module projects the image in the high brightness mode;
wherein, when the angle value maintains within an angle range which is responded to a head down position, the display module projects the image in the low brightness mode.
2 . The head-up display device of claim 1 , wherein the shield includes an object lens and an ocular lens; wherein the object lens reflects the image, the image being reflected by the object lens and then projected to the ocular lens.
3 . The head-up display device of claim 2 , wherein the image is reflected by a front surface of the object lens and then projected to a rear surface of the ocular lens.
4 . The head-up display device of claim 1 , further comprising an acceleration sensor for detecting changes of the angle value due to inertia.
5 . The head-up display device of claim 1 , wherein the second wireless module and the first wireless module of the helmet are provided with a pairing information; wherein the display module projects the image to the shield based on the pairing information.
6 . The head-up display device of claim 1 , wherein the display module is provided with more than two kinds of brightness modes.
7 . The head-up display device of claim 1 , wherein the second wireless module comprises Bluetooth module or RFID module.