REAR PROJECTION SYSTEM

• US 20070097329A1
• Filed: 10/27/2005
• Published: 05/03/2007
• Est. Priority Date: 10/27/2005
• Status: Abandoned Application

• Current Assignee: Chunghwa Picture Tubes Limited
• Original Assignee: Chunghwa Picture Tubes Limited
• Inventors: Liu, Chia-Lin, Mo, Chi-Neng, Wu, Shih-Min, Ho, Ming-Tsung, Lai, Kuo-Yen
• Application Number:
  US11/163,713
• Publication Number:
  US 20070097329A1
• Time in Patent Office: Days
• US Class Current: 353/77
• CPC Class Codes: G03B 21/10 Projectors with built-in or built-on screen

Abstract

A rear projection system includes a partially transmissive reflector, an image source installed on one side of the reflector for projecting an image to the reflector, a screen for receiving the image projected from the image source and reflected from the reflector so as to display the image, at least one light sensor installed on the other side of the reflector for sensing light of the image projected from the image source to the reflector and passing through the reflector, and a control module coupled to the light sensor for controlling the image source to project a next image according to the sensing result of the light sensor.

Claims

1. A rear projection system comprising:

a partially transmissive reflector;

an image source installed on one side of the reflector for projecting an image to the reflector;

a screen for receiving the image projected from the image source to the reflector and reflected from the reflector so as to display the image;

at least one light sensor installed on the other side of the reflector for sensing light of the image projected from the image source to the reflector and passing through the reflector; and

a control module coupled to the light sensor for controlling the image source to project a next image according to the sensing result of the light sensor.

2. The rear projection system of claim 1 wherein the image source is installed between the reflector and the screen.

3. The rear projection system of claim 1 wherein the image source comprises:

an image generator for transforming an image signal into a corresponding image; and

a lens group for receiving and adjusting the image generated by the image generator and projecting the adjusted image to the reflector.

4. The rear projection system of claim 3 wherein the control module is capable of adjusting the lens group so as to adjust the size and the position of the image according to the sensing result of the light sensor.

5. The rear projection system of claim 3 wherein the control module is capable of adjusting the brightness of the image generated by the image generator according to the sensing result of the light sensor.

6. The rear projection system of claim 1 wherein the screen is a rectangular screen.

7. The rear projection system of claim 1 further comprising an analog multiplexer for receiving light detection data generated by the light sensor.

8. The rear projection system of claim 7 further comprising an analog-to-digital converter for converting the data from the analog multiplexer into digital data and transferring the digital data to the control module.

9. The rear projection system of claim 1 further comprising an analog-to-digital converter for converting data from the light sensor into digital data and transferring the digital data to the control module.

10. The rear projection system of claim 1 being a cathode ray tube (CRT) monitor.

11. The rear projection system of claim 1 being a digital light processing (DLP) monitor.

12. The rear projection system of claim 1 being a liquid crystal on silicon (LOS) monitor.

13. The rear projection system of claim 1 being a liquid crystal display (LCD) monitor.