US 12,094,430 B2
Field-sequential projector device, head-up display device, program, and voltage measurement method
Sayaka Mizuno, Niigata (JP)
Assigned to Nippon Seiki Co., Ltd., Niigata (JP)
Appl. No. 17/796,984
Filed by NIPPON SEIKI CO., LTD., Niigata (JP)
PCT Filed Feb. 24, 2021, PCT No. PCT/JP2021/006794
§ 371(c)(1), (2) Date Aug. 2, 2022,
PCT Pub. No. WO2021/172332, PCT Pub. Date Sep. 2, 2021.
Claims priority of application No. 2020-031262 (JP), filed on Feb. 27, 2020.
Prior Publication US 2023/0344968 A1, Oct. 26, 2023
Int. Cl. G01K 7/01 (2006.01); G02B 27/01 (2006.01); G09G 3/00 (2006.01); G09G 3/34 (2006.01); H04N 9/31 (2006.01); G09G 3/32 (2016.01)
CPC G09G 3/346 (2013.01) [G02B 27/01 (2013.01); G09G 3/002 (2013.01); H04N 9/3105 (2013.01); H04N 9/312 (2013.01); G02B 2027/0112 (2013.01); G09G 3/32 (2013.01); G09G 2310/0235 (2013.01); G09G 2310/08 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A field-sequential projector device comprising:
a light-emitting diode;
a storage that stores lighting pattern information that is information for lighting the light-emitting diode in a preset lighting pattern and that indicates a time sequence of a lighting start timing of the light-emitting diode and a lighting duration period from the lighting start timing;
a computer that drives the light-emitting diode to emit light based on the lighting pattern in the lighting pattern information; and
a display element that generates display light representing an image based on the light emitted by the light-emitting diode,
wherein the computer:
determines, based on the lighting pattern information, the lighting duration period longer than a preset setting period as a target period;
executes a voltage measurement process to measure a forward voltage of the light-emitting diode within the determined target period at a timing after the setting period has elapsed from start of the period; and
executes the voltage measurement process while a drive current of the light-emitting diode is increased for lighting.