Invention Grant
- Patent Title: Laser projection display device and driving method for laser beam source
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Application No.: US15221746Application Date: 2016-07-28
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Publication No.: US10425626B2Publication Date: 2019-09-24
- Inventor: Yuya Ogi , Yoshiho Seo
- Applicant: Hitachi-LG Data Storage, Inc.
- Applicant Address: JP Tokyo
- Assignee: HITACHI-LG DATA STORAGE, INC.
- Current Assignee: HITACHI-LG DATA STORAGE, INC.
- Current Assignee Address: JP Tokyo
- Agency: Volpe and Koenig, P.C.
- Priority: JP2015-207419 20151021
- Main IPC: H04N9/31
- IPC: H04N9/31 ; G02B26/08 ; H01S5/062

Abstract:
The laser projection display device (1) includes a laser beam source (5), a laser driver (4) driving the laser beam source, and an image processing unit (2) supplying a display image signal to the laser driver. The image processing unit applies a preliminary emission signal (53) to perform preliminary emission to an image signal (50) in a predetermined period (t0 to t1) immediately before a black pixel signal is switched to a signal except for the black pixel signal when the image signal has a black pixel duration. In particular, the preliminary emission process is performed when the laser beam source is operated in a dark image region while being reduced in maximum light intensity, and, as the preliminary emission signal, a signal (L0) corresponding to a light intensity which is 1/10 or less a maximum light intensity (La) in the dark image region.
Public/Granted literature
- US20170118452A1 LASER PROJECTION DISPLAY DEVICE AND DRIVING METHOD FOR LASER BEAM SOURCE Public/Granted day:2017-04-27
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