Apparatus for compensating for image display characteristics

• US 5,757,438 A
• Filed: 11/04/1996
• Issued: 05/26/1998
• Est. Priority Date: 08/04/1994
• Status: Expired due to Term

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Yoon, Sang Han, Ha, Young Ho
• Primary Examiner(s): Peng, John K.
• Assistant Examiner(s): Flynn, Nathan J.
• Application Number:
  US08/743,525
• Time in Patent Office: 568 Days
• Field of Search: 348/222, 348/223, 348/224, 348/225, 348/226, 348/227, 348/362-366, 348/602, 348/603, 348/625, 348/645, 348/646, 348/647, 348/649, 348/651, 348/655, 348/656, 348/658, 348/678, 348/687, 348/696, 348/720, 396/98, 396/289
• US Class Current: 348/603
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2360/144 the light being ambient light
• CPC Class Codes: G09G 5/02 characterised by the way in which colour is displayed details of colour display specific for CRTs G09G1/28; specific for flat matrix panels other than liquid crystal displays G09G3/2003; specific for liquid crystal displays G09G3/3607
• CPC Class Codes: H04N 5/58 in dependence upon ambient light
• 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

An image compensation system and methods for video appliances to reproduce an optimum image, by judging exterior environment and by compensating for an original image by the judged exterior environment. According to the system and methods, a color sensor senses color of exterior lighting of an appliance, and provides electrical signals corresponding to color components of the sensed color. The signals are converted into a digital value by an analog-to-digital converter. A microprocessor judges the type of exterior lighting, by the digitized values, and searches for image compensation data according to the judged exterior lighting. It thereby makes a video processor compensate for an original image signal.

Claims

1. An image compensation system for a video appliance, comprising:

a sensor for generating a plurality of color signals, each color signal corresponding respectively to one of a plurality of color components of ambient light incident on said sensor;

a memory for storing a plurality of sets of compensation data, each set corresponding to a respective one of a plurality of ambient light modes and representing image display characteristics which include two or more of contrast, brightness, saturation, sharpness, and white balance; and

a microcontroller for determining a respective ambient light mode in response to said plurality of color signals and generating a compensation signal for compensating a video image during display on said video appliance based on the set of compensation data stored in the memory corresponding to the determined respective ambient light mode.

4. The image compensation system of claim 1 wherein said two or more of the display characteristics include hue.

2. An image compensation system for a video appliance, comprising:

a sensor for generating a plurality of color signals, each color signal corresponding respectively to one of a plurality of color components of ambient light incident on said sensor;

a memory for storing a plurality of sets of compensation data, each set corresponding to a respective one of a plurality of ambient light modes and representing image display characteristics which include two or more of contrast, brightness, saturation, sharpness, and white balance; and

a microcontroller comprising means for determining a respective ambient light mode based on a summation of at least two of said plurality of color signals, and means for selecting the set of compensation data stored in the memory corresponding to the determined respective ambient light mode, said microcontroller generating a compensation signal based on the selected set of compensation data.

3. An image compensation system for a video appliance, comprising:

a sensor for generating a plurality of color signals, each color signal corresponding respectively to one of a plurality of color components of ambient light incident on said sensor;

a memory for storing a plurality of sets of compensation data, each set corresponding to a respective one of a plurality of ambient light modes and representing image display characteristics which include two or more of contrast, brightness, saturation, sharpness, and white balance; and

a microcontroller comprising means for determining a respective ambient light mode based on a summation of at least two of said plurality of color signals, and determining the respective ambient light mode based on results of such summing and a correlation between said plurality of color signals, and means for selecting the set of compensation data stored in the memory corresponding to the determined respective ambient light mode, said microcontroller generating a compensation signal based on the selected set of compensation data.