Image display device and control method thereof

Patent metadata

Field	Value
Publication number	US-9894335-B2
Application number	US-201715591408-A
Country	US
Kind code	B2
Filing date	May 10, 2017
Priority date	Nov 10, 2014
Publication date	Feb 13, 2018
Grant date	Feb 13, 2018

Abstract

An image display device includes: an RGB laser diode configured to output laser light; a horizontal scanner configured to reflect the laser light and perform a reciprocating operation in a horizontal direction; a scanning detection unit configured to detect a forward or reverse operation range and a reciprocating operation range in each line in the horizontal direction; a drawing position control unit configured to determine an image display position in each line based on a difference between the detected operation ranges and a reference value; and a laser driver configured to drive the RGB laser diode based on image data at a timing corresponding to the determined image display position.

First claim

What is claimed is:

1. An image display device comprising:
a light source unit configured to output a light beam;
a scanning unit configured to reflect the light beam and repeat a reciprocating operation in a predetermined scanning direction;
a scanning detection unit configured to detect a first operation range of the scanning unit in each forward or reverse scanning line of the reciprocating operation and a second operation range of the scanning unit in each reciprocation of the reciprocating operation;
a display position determination unit configured to determine an image display position in each scanning line based on a first difference between the detected first operation range and a first reference value for the forward or reverse line and a second difference between the detected second operation range and a second reference value for the reciprocating operation; and
a light source driving unit configured to drive the light source unit based on image data at a timing corresponding to the determined image display position.

2. The image display device according to claim 1 , wherein the scanning unit repeats the reciprocating operation so that a forward operating range is equal to a reverse operating range.

3. The image display device according to claim 1 , wherein the display position determination unit determines the image display position according to a difference between the first difference and the second difference.

4. The image display device according to claim 3 , wherein the display position determination unit corrects the image display position by using half of the difference as a correct value.

5. The image display device according to claim 1 , further comprising a counter configured to count the first operation range and the second operation range based on a clock,
wherein the display position determination unit corrects a counting start position of the counter in each scanning line based on a difference between a count value obtained by counting the first operation range by the counter and a count value corresponding to the first reference value and a difference between a count value obtained by counting the second operation range by the counter and a count value corresponding to the second reference value.

6. The image display device according to claim 5 , wherein the display position determination unit corrects the counting start position of the forward scanning line.

7. The image display device according to claim 1 , wherein the scanning detection unit detects the first and second operation ranges based on a delayed signal that is generated by delaying a reciprocating operation detection signal according to the reciprocating operation of the scanning unit by a predetermined time.

8. A control method of an image display device, the image display device comprising: a light source unit configured to output a light beam; and a scanning unit configured to reflect the light beam and repeat a reciprocating operation in a predetermined scanning direction, the control method comprising:
detecting a first operation range of the scanning unit in each forward or reverse scanning line of the reciprocating operation and a second operation range of the scanning unit in each reciprocation of the reciprocating operation;
determining an image display position in each scanning line based on a first difference between the detected first operation range and a first reference value for the forward or reverse line and a second difference between the detected second operation range and a second reference value for the reciprocating operation; and
driving the light source unit based on image data at a timing corresponding to the determined image display position.

Assignees

• Jvc Kenwood Corp

Inventors

• Ohara Tatsuya

Classifications

• G02B26/101

  with both horizontal and vertical deflecting means, e.g. raster or XY scanners (colour television using laser beams scanning a display screen H04N9/3129) · CPC title

• H04N9/3135

  Driving therefor · CPC title

• H04N5/74

  Projection arrangements for image reproduction, e.g. using eidophor · CPC title

• G02B26/10

  Scanning systems · CPC title

• H04N9/3185 Primary

  Geometric adjustment, e.g. keystone or convergence (optical or mechanical adjustment of convergence H04N9/317; using scanning means H04N3/22; optical or mechanical adjustments of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/14) · CPC title