# US 10,319,269 B2 · Laser light source device and display apparatus

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- Number: US 10,319,269 B2
- Document ID: US10319269B2
- Status: Granted
- Kind: B2
- Application number: 15/139,195
- Filed: 2016-04-26
- Published: 2016-11-24
- Granted: 2019-06-11
- Earliest claimed: 2015-05-22
- Assignees: Panasonic Intellectual Property Management Co., Ltd.
- Applicants: Panasonic Intellectual Property Management Co., Ltd.
- Inventors: Takahisa Shiramizu; Tetsuro Mizushima; Junichi Mutoh; Susumu Uragami
- Web page: https://patentgrep.com/patent/US10319269B2

## CPC

- G09G 3/025: {with scanning or deflecting the beams in two directions or dimensions}
- G09G 3/02: by tracing or scanning a light beam on a screen
- H01S 5/06216: {Pulse modulation or generation}
- H04N 9/31: Projection devices for colour picture display {, e.g. using electronic spatial light modulators [ESLM]}
- H04N 9/3129: {scanning a light beam on the display screen (scanning a light beam on a screen in displays other than projection devices G09G3/02; scanning systems in general G02B26/10; projectors using laser light sources in general H04N9/3161)}
- H01S 5/4012: {Beam combining, e.g. by the use of fibres, gratings, polarisers, prisms}
- H01S 5/4093: {Red, green and blue [RGB] generated directly by laser action or by a combination of laser action with nonlinear frequency conversion}
- 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)
- H01S: DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

A laser light source device includes a semiconductor laser, a current supplying unit to supply a driving current to the semiconductor laser, and a signal generator to generate current intensity data for setting an intensity of the driving current. The signal generator generates, for an input signal corresponding to continuous pixels for a same color, a plurality of sets of the current intensity data indicating current intensities different from each other, and transmits the plurality of sets of the current intensity data to the current supplying unit while sequentially switching the plurality of sets of the current intensity data. The current supplying unit drives the semiconductor laser based on the plurality of different sets of the current intensity data.

## Claims

### Claim 1

A display apparatus comprising:
a semiconductor laser for emitting laser light;
a scanning unit to perform a first scanning for scanning of the laser light in a first direction and a second direction along a first axis, and a second scanning for scanning of the laser light along a second axis perpendicular to the first axis;
a current supplying unit to supply a driving current to the semiconductor laser; and
a signal generator to generate current intensity data for setting an intensity of the driving current,
wherein the signal generator generates, for an input signal corresponding to continuous pixels for a same color, a plurality of sets of the current intensity data indicating current intensities different from each other in a time interval shorter than one pixel time, and transmits the plurality of sets of the current intensity data to the current supplying unit while sequentially alternating the plurality of sets of the current intensity data in accordance with the first or second direction of scanning along the first axis such that the current intensity increases within each one pixel time when scanning an nth row in the first direction and decreases within each one pixel time when scanning an nth+1 row in the second direction for a plurality of rows along the second axis, and
wherein the current supplying unit drives the semiconductor laser based on the plurality of sets of the current intensity data.

### Claim 2 (depends on 1)

The display apparatus according to claim 1, wherein the signal generator alternates the plurality of sets of the current intensity data at a moment when the scanning unit alternates a scanning of the laser light from a left direction to a right direction, or at a moment when the scanning unit alternates a scanning of the laser light from the right direction to the left direction.

### Claim 3 (depends on 1)

The display apparatus according to claim 1, wherein the semiconductor laser emits light at different light emission intensities within each one pixel of time, the different light emission intensities corresponding to the different current intensities within the plurality of sets of the current intensity data.

### Claim 4 (depends on 1)

The display apparatus according to claim 1, wherein in accordance with the scanning direction along the first axis the current intensity changes from high to low within each one pixel time when scanning in a left-to-right direction and changes from low to high within each one pixel time when scanning in a right-to-left direction.

### Claim 5 (depends on 1)

The display apparatus according to claim 1, wherein the semiconductor laser emits light at three different light emission intensities within each one pixel of time, the three different light emission intensities corresponding to the different current intensities within the plurality of sets of the current intensity data.