A projection-type image display apparatus that projects an image onto a screen and includes a laser light source, an optical engine, a projection lens, and a control unit. The laser light source includes a plurality of light source units that respectively emit laser beams of different wavelengths. The optical engine combines the laser beams received from the light source and forms an image. An optical sensor is arranged in the optical engine to detect a physical property of a uniformly-scattered laser beam and outputs a physical property signal indicative of the detected physical property to the control unit. The control unit controls output powers of the light source units based on the physical property signal.

Claims

8 · 1 independent · depth 2

8 granted claims

›1.independentA projection-type image display apparatus comprising:na laser light source that includes a plurality of light source units each of which emits a laser…+7

›2.↳ 1The projection-type image display apparatus according to claim 1, wherein the optical sensor is arranged at a position where a light scattering in the…d2

›3.↳ 1The projection-type image display apparatus according to claim 1, wherein the optical engine further includesnoptical components;a housing that houses…d2

›4.↳ 1The projection-type image display apparatus according to claim 1, wherein the optical engine includesna converging unit that converges the laser beam …d2

›5.↳ 1The projection-type image display apparatus according to claim 1, wherein the control unit controls at least one of the light source units such that a…d2

›6.↳ 1The projection-type image display apparatus according to claim 1, wherein when the physical property signal indicates that the physical property of th…d2

›7.↳ 1The projection-type image display apparatus according to claim 1, wherein the physical property signal indicates light intensity of each of the laser …d2

›8.↳ 1The projection-type image display apparatus according to claim 1, wherein the physical property signal indicates chromaticity of each of the laser bea…d2

Classifications

6 codes

IPC · International Patent Classification

Section G — Physics

G03B21/20
G03H1/02

Section H — Electricity

H01J40/14

USPC · US Patent Classification

353/85250/239359/28

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File wrapper

Pendency

2.9 y

1,075 days filing → grant

Office actions

non-final + final

Responses

no RCE

Examiner

Georgia Y Epps

art unit 2878 · TC 2800

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Citations: 5 back · 0 forward

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Priority chain

1 priority documents

›Priority documents — 1

Type	Document	Date
related publication	US 20100007855 A1	14 Jan 2010

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