Scanning laser display apparatus using laser diode array directed to and corresponding with condensing means of plane mirrors

• US 7,535,613 B2
• Filed: 05/18/2006
• Issued: 05/19/2009
• Est. Priority Date: 04/21/2006
• Status: Expired due to Fees

• Current Assignee: HB Electronics Co., Ltd.
• Original Assignee: HB Electronics Co., Ltd.
• Inventors: Baik, Haing-Ju
• Primary Examiner(s): Amari; Alessandro
• Assistant Examiner(s): Doak; Jennifer L.
• Application Number:
  US11/419,195
• Publication Number:
  US 20070247690A1
• Time in Patent Office: 1,097 Days
• Field of Search: 359196-226, 347/233, 347/241, 347243-244, 347/256, 347258-261
• US Class Current: 347/241
• CPC Class Codes: G02B 26/105 with one or more pivoting mirrors or galvano-mirrors G02B26/101 takes precedence
• CPC Class Codes: G02B 26/124 Details of the optical system between the light source and the polygonal mirror G02B26/123, G02B26/127 take precedence
• CPC Class Codes: G02B 26/125 Details of the optical system between the polygonal mirror and the image plane G02B26/123, G02B26/127 take precedence; F-Theta lenses G02B13/0005
• CPC Class Codes: G02B 26/126 including curved mirrors
• CPC Class Codes: 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

Abstract

An improved laser display apparatus is disclosed, which comprises a LED device array in which a plurality of laser diode devices are arranged in a straight shape for thereby scanning a laser diode in accordance with an image signal inputted, with the laser diode devices being designed to generate laser light; a collimation lens which is provided at one side of the LED device array for collimating each laser light scanned from the laser diode devices in parallel in one direction; a condensing unit which is provided at one side of the collimation lens for collimating each laser light, which is collimated in one direction by the collimation lens, through one imaginary focus; and a scanning unit which reflects laser light which transmits through the condensing unit.

Claims

1. A laser display apparatus which forms an image at a screen by scanning a laser light, comprising:

a light emitting diode (LED) device array comprising a plurality of laser diode devices arranged in a straight shape configured to scan a laser diode in accordance with an image signal inputted, with the laser diode devices being designed to generate laser light;

a collimation lens, provided at one side of the LED device array, configured to collimate each laser light scanned from the laser diode devices in parallel in one direction;

a condensing means, provided at one side of the collimation lens, configured to allow each laser light, collimated by the collimation lens, to transmit through one imaginary focus, wherein said condensing means is formed of a plurality of plane minors corresponding to laser lights collimated in a straight direction by the collimation lens, and said plane minors are installed so that each laser light is converged at one imaginary focus; and

a scanning means configured to reflect each of the laser light which transmits via the condensing means, wherein each of the laser light is reflected from the one imaginary focus so as to form the image on the screen,

wherein the one imaginary focus is located on a point on a reflecting surface of the scanning means,

wherein each of said plane mirrors is arranged at one side at predetermined inclination angles and corresponds to a laser diode device of the laser diode device array, and

wherein said plane mirror reflects the laser light scanned by the laser diode device.

2. The apparatus of claim 1, further comprising:

a first rotation polygon mirror which linearly reflects laser light scanned from the LED device array;

a swing actuator which is installed in a vertical direction with respect to a rotation shaft of the first rotation polygon mirror; and

a controller which synchronically controls the first rotation polygon mirror and the swing actuator.

3. The apparatus of claim 2, wherein said controller is formed of a central controller, an image controller and a sync controller, and said central controller inputs a signal detected by a polygon mirror position detection sensor into the sync controller and the image controller, respectively, and said image controller receives a video signal and transmits a sync signal to the sync controller and transmits a video signal to the video memory apparatus, and said sync controller receives a control signal of the first rotation polygon mirror and a control signal of the swing actuator for thereby implementing a sync control operation. with the first rotation polygon mirror being formed of a polygon mirror motor, a driver and a motor controller, and with the swing actuator being formed of an actuator, a driver and a waveform generator.

4. The apparatus of claim 1, wherein said scanning means of the laser display apparatus, comprising:

a first rotation polygon mirror which linearly reflects laser light scanned from the LED device array;

a second rotation polygon mirror which is installed in a vertical direction with respect to a rotation shaft of the first rotation polygon mirror; and

a controller which synchronically controls the first rotation polygon mirror and the second rotation polygon mirror.

5. The apparatus of claim 4, wherein said controller is formed of a central controller, an image controller and a sync controller, and said central controller inputs a signal detected by a polygon mirror position detection sensor into the sync controller and the image controller, respectively, and said image controller receives a video signal and transmits a sync signal to the sync controller and transmits a video signal to the video memory apparatus, and said sync controller receives a control signal of the first rotation polygon mirror and a control signal of the second rotation polygon mirror for thereby implementing a sync control operation. with the first rotation polygon mirror being formed of a polygon mirror motor, a driver and a motor controller, and with the second rotation polygon mirror being formed of a second motor, a driver and a second motor controller.

6. The laser display apparatus of claim 1, wherein the plurality of plane mirrors are arranged so as to form a concave mirror.