Invention Grant
- Patent Title: Measuring device and measuring method for threshold of flicker
- Patent Title (中): 闪烁阈值的测量装置和测量方法
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Application No.: US13062081Application Date: 2009-08-27
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Publication No.: US08808196B2Publication Date: 2014-08-19
- Inventor: Nobuyoshi Harada , Sunao Iwaki
- Applicant: Nobuyoshi Harada , Sunao Iwaki
- Applicant Address: JP Tokyo
- Assignee: National Institute of Advanced Industrial Science and Technology
- Current Assignee: National Institute of Advanced Industrial Science and Technology
- Current Assignee Address: JP Tokyo
- Agency: Wenderoth, Lind & Ponack, L.L.P.
- Priority: JP2008-231630 20080910; JP2009-043625 20090226
- International Application: PCT/JP2009/064984 WO 20090827
- International Announcement: WO2010/029858 WO 20100318
- Main IPC: A61B13/00
- IPC: A61B13/00 ; A61B3/02 ; A61B3/00

Abstract:
This invention relates to a flicker threshold measurement device including: an arithmetic processing unit 1; a display unit 8 with a fixed refresh rate; and an operation unit 9, wherein: the arithmetic processing unit 1 displays an image on the display unit 8 in an ON/OFF manner; the arithmetic processing unit 1 changes the display timing by monotonously increasing or decreasing the number of OFF periods per second; the arithmetic processing unit 1 monotonously increases or decreases at least one of: the number of OFF pixels in the image, the size of the image, and the contrast of the OFF pixels, during a period in which the display timing is not changed; each of the OFF periods is a reciprocal of the refresh rate; and the arithmetic processing unit 1 determines the number of OFF periods when a test subject 10 operates the operation unit 9 as he/she starts or stops perceiving flicker, as information corresponding to a flicker threshold. The present measurement device is capable of measuring a flicker threshold in a wide range of conditions, using a display apparatus with a fixed refresh rate (vertical synchronization frequency). Thereby, the present measurement device is useful for evaluating fatigue.
Public/Granted literature
- US20110157261A1 MEASURING DEVICE AND MEASURING METHOD FOR THRESHOLD OF FLICKER Public/Granted day:2011-06-30
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