# US 2014/0192093 A1 · Laser beam display device

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2014/0192093 A1
- Document ID: US20140192093A1
- Status: Published application
- Kind: A1
- Application number: 14/132,034
- Filed: 2013-12-18
- Published: 2014-07-10
- Earliest claimed: 2013-01-07
- Assignees: Hitachi Media Electronics Co., Ltd.
- Applicants: Hitachi Media Electronics Co., Ltd.
- Inventors: Fumio HARUNA; Yuya OGI; Tomoki KOBORI; Yoshiho SEO; Masayuki HATORI; Toshio UEDA
- Web page: https://patentgrep.com/patent/US20140192093A1

## CPC

- G09G 5/10: Intensity circuits
- G09G 3/025: {with scanning or deflecting the beams in two directions or dimensions}
- G09G 2320/0271: Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G 2320/043: Preventing or counteracting the effects of ageing
- G09G 2320/0606: Manual adjustment
- G09G 2320/0633: by amplitude modulation of the brightness of the illumination source
- G09G 2320/0673: for control of gamma adjustment, e.g. selecting another gamma curve
- G09G 2360/144: the light being ambient light
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)

## Abstract

A laser beam display device includes: a dimming setting input unit into which any one of the dimming values of plural dimming steps are input; a first dimming processing unit having plural dimming LUTs that store dimming amounts regarding the respective dimming steps with the corresponding gradation levels as indexes; a second dimming processing unit having one gain LUT that holds gains regarding the respective dimming steps and a multiplier that creates the indexes for the respective diming LUTs by multiplying a video signal by the gains; and a light source drive unit that drives a laser diode on the basis of reference results obtained by referring to the dimming LUTs of the first dimming processing unit. The luminance of the emission beam of the laser diode, which corresponds to the video signal, is dimmed in accordance with a dimming setting input from the dimming setting input unit.

## Claims

### Claim 1

A laser beam display device in which semiconductor laser light emitted from a laser diode is modulatedly driven by a video signal, and an image corresponding to the video signal is displayed by scanning the emission beam of the laser diode, the laser beam display device comprising:
a dimming setting input unit into which any one of the dimming values of a plurality of dimming steps are input;
a first dimming processing unit having a plurality of dimming look-up tables that store dimming amounts regarding the respective dimming steps with the corresponding gradation levels as indexes;
a second dimming processing unit having one gain look-up table that holds gains regarding the respective dimming steps and a multiplier that creates the indexes for the respective diming look-up tables by multiplying the video signal by the gains; and
a light source drive unit that drives the laser diode on the basis of reference results obtained by referring to the dimming look-up tables of the first dimming processing unit,
wherein the luminance of the emission beam of the laser diode, which corresponds to the video signal, is dimmed in accordance with a dimming setting input from the dimming setting input unit.