US 12,105,293 B2
Head-up display
Masashi Takahata, Tokyo (JP); and Hitoshi Saito, Tokyo (JP)
Assigned to Japan Display Inc., Tokyo (JP)
Filed by Japan Display Inc., Tokyo (JP)
Filed on Aug. 14, 2023, as Appl. No. 18/233,626.
Application 18/233,626 is a continuation of application No. PCT/JP2022/003890, filed on Feb. 1, 2022.
Claims priority of application No. 2021-025538 (JP), filed on Feb. 19, 2021.
Prior Publication US 2023/0384597 A1, Nov. 30, 2023
Int. Cl. G02B 27/01 (2006.01); G06F 3/14 (2006.01); G09G 3/18 (2006.01); G09G 3/36 (2006.01)
CPC G02B 27/0172 (2013.01) [G06F 3/14 (2013.01); G09G 3/18 (2013.01); G09G 3/36 (2013.01); G09G 2320/041 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A head-up display that is configured to project an image onto a projection target having a light-transmitting property to make a virtual image visible to a user, comprising:
a plurality of display panels,
a light guide that is configured to direct light from the display panels such that projection positions of images from display regions of the display panels join on the projection target, and
a temperature detector, wherein
at least one of time division control and multiple display control is applied to the display panels,
the time division control is operation control of the display panels such that the display panels project images at different timings,
the multiple display control is operation control of the display panels in which partial regions are set in each of the display regions such that the number of the partial regions corresponds to the number of the display panels, an image is output in one of the partial regions in the display region of each display panel such that the positions of the images projected by the display panels on the projection target differ from one another,
the temperature detector is configured to detect a temperature of each partial region individually, and
when the temperature of the partial region in the display region of one or some of the display panels is equal to or higher than the predetermined threshold temperature, control is performed such that an image is not projected from the partial region with the high temperature, and the image is projected from the partial region of another display panel that projects an image onto the projection target at the same position of the image projected from the partial region with the high temperature.