Color correction

• US 6,285,350 B1
• Filed: 11/23/1998
• Issued: 09/04/2001
• Est. Priority Date: 11/22/1997
• Status: Expired due to Fees

• Current Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Original Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Inventors: Ijntema, Dominicus J., Van Den Eeden, Adrianus L. G., Doyle, Terence
• Primary Examiner(s): Cuchlinski, Jr., William A.
• Assistant Examiner(s): NGUYEN, THU V
• Application Number:
  US09/198,043
• Time in Patent Office: 1,016 Days
• Field of Search: 345/10, 345/11, 345/22, 345/150, 345/151, 345/207, 315/8, 315/10, 315/11.5, 358/515, 358/516, 358/518, 358/519, 358/520, 358/532, 348/223, 348/227
• US Class Current: 345/690
• CPC Class Codes: H04N 9/73 Colour balance circuits, e.g. white balance circuits or colour temperature control camera processing pipelines for colour balance H04N23/88

Abstract

In a display apparatus having a display device (CRT), a variable light transmission panel or coating (P) at a front side of the display device (CRT), amplifiers (A_R, A_G, A_B) for furnishing color signals to control terminals of the display device (CRT), and a control unit (C) for controlling the variable light transmission panel or coating (P) and the amplifiers (A_R, A_G, A_B), the amplifiers (A_R, A_G, A_B) are controlled in such a manner that a color deviation of the variable light transmission panel or coating (P) is compensated for.

Claims

1. A display apparatus comprising:

a display device;

variable light transmission means at a front side of said display device, said variable light transmission means having a variable light transmissivity, and having color characteristics which deviate with changes in the light transmissivity of said variable light transmission means;

processing means for furnishing color signals to control terminals of said display device; and

control means for controlling said variable light transmission means and said processing means, wherein said processing means is controlled such that said color characteristic deviation of said variable light transmission means is compensated for at different transmissivities of said variable light transmission means.

2. A display apparatus as claimed in claim 1, wherein said processing means comprises:

means for linearizing applied color signals;

matrix means for compensating said color characteristic deviation of said variable light transmission means; and

gamma correction means for furnishing color signals to control terminals of said display device.