Monitor

• US 20040113924A1
• Filed: 01/09/2004
• Published: 06/17/2004
• Est. Priority Date: 05/30/2001
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Jeong, Dong-Won
• Granted Patent: US 7,173,638 B2
• Time in Patent Office: Days
• US Class Current: 345/690
• CPC Class Codes: G09G 2320/0276 for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
• CPC Class Codes: G09G 2370/047 using display data channel standard [DDC] communication
• 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: G09G 5/04 using circuits for interfacing with colour displays
• 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

A monitor is disclosed, in which R/G/B signals provided from a video source are compensated to adapt to the color reproduction of the monitor, thereby obtaining the best picture quality. The monitor includes a video source for outputting one video signal, a color compensator for detecting characteristics of the video signal output from the video source and for comparing the detected characteristics with display characteristics of the monitor to compensate the color of the video signal, a video processor for processing the video signal output from the color compensator, and a display for displaying the video signal output from the video processor.

Claims

1. A monitor comprising:

a video source outputting a video signal;

a color correction unit detecting a characteristic of the video signal outputted from the video source and correcting a color of the video signal by comparing the detected characteristic of the video signal to a display characteristic of the monitor;

a video processing unit carrying out a video processing on the color-corrected video signal outputted from the color correction unit; and

a display unit displaying the video signal outputted from the video processing unit.

2. The monitor of claim 1, wherein the display unit is selected from a group consisting of CRT (cathode ray tube), LCD (liquid crystal display), and PDP (plasma display panel).

3. The monitor of claim 1, wherein the video signal detected by the color correction unit is a signal video-processed through the video processing unit.

4. The monitor of claim 1, wherein the video signal detected by the color correction unit is a full white signal and a partial white signal.

5. The monitor of claim 1, wherein a characteristic information of the video signal detected by the color correction unit includes at least one selected from a group consisting of R/G/B brightness, current, and voltage data.

6. The monitor of claim 1, wherein the display characteristic information of the monitor is included in EDID (extended display identification data).

7. The monitor of claim 1, the color correction unit comprising:

an A/D conversion unit converting an analog reference video signal for color correction to be video-processed through the video processing unit into a digital reference video signal;

a memory unit storing the display characteristic information of the monitor and the digital reference video signal outputted from the A/D conversion unit;

an R/G/B voltage ratio operation unit calculating an R/G/B voltage ratio of the digital reference video signal outputted from the A/D conversion unit;

an R/G/B white gamma operation unit calculating an R/G/B white gamma value of the reference video signal using the R/G/B voltage ratio calculated by the R/G/B voltage ratio operation unit and the monitor display characteristic information stored in the memory unit;

a gamma difference operation unit calculating a difference between the R/G/B white gamma value of the reference video signal outputted from the R/G/B white gamma operation unit and the R/G/B white gamma value included in the monitor characteristic information stored in the memory unit;

a D/A conversion unit converting an output of the gamma difference operation unit into analog; and

an adder unit overlapping the gamma difference value outputted from the D/A conversion unit with the video signal outputted from the video source for color correction so as to output the overlapped result to the video processing unit.

8. A monitor comprising:

a video source outputting a video signal;

a microcomputer requesting the video source to transmit a video signal for color correction in accordance with a user'"'"'s color correction request;

a color correction unit detecting a characteristic of the video signal outputted from the video source, the color correction unit comparing the detected characteristic of the video signal to a display characteristic of the monitor so as to calculate a color correction value in accordance with a characteristic difference between the detected and display characteristics, and the color correction unit correcting a color of the video signal in accordance with the color correction value;

a video processing unit carrying out a video processing on the color-corrected video signal outputted from the color correction unit; and

a display unit displaying the video signal outputted from the video processing unit.

9. The monitor of claim 8, wherein the display unit is selected from a group consisting of CRT (cathode ray tube), LCD (liquid crystal display), and PDP (plasma display panel).

10. The monitor of claim 8, wherein the video signal detected by the color correction unit is a signal video-processed through the video processing unit.

11. The monitor of claim 8, wherein the video signal detected by the color correction unit is a full white signal and a partial white signal.

12. The monitor of claim 8, wherein a characteristic information of the video signal detected by the color correction unit includes at least one selected from a group consisting of R/G/B brightness, current, and voltage data.

13. The monitor of claim 8, wherein the display characteristic information of the monitor is included in EDID (extended display identification data).

14. The monitor of claim 8, wherein the display characteristic of the monitor is stored in the microcomputer or the microcomputer and color correction unit in common.

15. The monitor of claim 14, wherein the microcomputer transmits the display characteristic information to the color correction unit at a color correction mode when the display characteristic of the monitor is stored in the microcomputer only.

16. The monitor of claim 8, the color correction unit comprising:

an A/D conversion unit converting an analog reference video signal for color correction to be video-processed through the video processing unit into a digital reference video signal;

a memory unit storing the display characteristic information of the monitor and the digital reference video signal outputted from the A/D conversion unit;

an R/G/B voltage ratio operation unit calculating an R/G/B voltage ratio of the digital reference video signal outputted from the A/D conversion unit;

an R/G/B white gamma operation unit calculating an R/G/B white gamma value of the reference video signal using the R/G/B voltage ratio calculated by the R/G/B voltage ratio operation unit and the monitor display characteristic information stored in the memory unit;

a gamma difference operation unit calculating a difference between the R/G/B white gamma value of the reference video signal outputted from the R/G/B white gamma operation unit and the R/G/B white gamma value included in the monitor characteristic information stored in the memory unit;

a D/A conversion unit converting an output of the gamma difference operation unit into analog; and

an adder unit overlapping the gamma difference value outputted from the D/A conversion unit with the video signal outputted from the video source for color correction so as to output the overlapped result to the video processing unit.

19. The monitor of claim 8, wherein the video signal detected by the color correction unit is a full white signal and a partial white signal.

17. A monitor comprising:

a microcomputer requesting a video source to transmit a reference video signal for color correction in accordance with a selection of a display mode for user'"'"'s color correction so as to output a control signal to perform a video processing of the reference video signal outputted from the video source or a general video signal outputted from the video source;

a video processing unit carrying out the video processing on the general or reference video signal outputted from the video source in accordance with the control signal outputted from the microcomputer;

a display unit displaying an output of the video processing unit on a screen; and

a color correction unit detecting a characteristic information of the reference video signal video-processed through the video processing unit, the color correction unit comparing the detected characteristic information to a display characteristic information of the monitor so as to calculate a compensation value in accordance with a display characteristic difference from the video source, and the color correction unit overlapping the compensation value with the general video signal outputted from the video source so as to output the overlapped value to the video processing unit.

18. The monitor of claim 17, wherein the display characteristic information of the monitor is included in EDID (extended display identification data) and the characteristic information of the reference video signal includes R/G/B brightness, current, and voltage data.

20. The monitor of claim 17, the color correction unit comprising:

an A/D conversion unit converting an analog reference video signal for color correction to be video-processed through the video processing unit into a digital reference video signal;

a memory unit storing the display characteristic information of the monitor and the digital reference video signal outputted from the A/D conversion unit;

an R/G/B voltage ratio operation unit calculating an R/G/B voltage ratio of the digital reference video signal outputted from the A/D conversion unit;

an R/G/B white gamma operation unit calculating an R/G/B white gamma value of the reference video signal using the R/G/B voltage ratio calculated by the R/G/B voltage ratio operation unit and the monitor display characteristic information stored in the memory unit;

a gamma difference operation unit calculating a difference between the R/G/B white gamma value of the reference video signal outputted from the R/G/B white gamma operation unit and the R/G/B white gamma value included in the monitor characteristic information stored in the memory unit;

a D/A conversion unit converting an output of the gamma difference operation unit into analog; and

an adder unit overlapping the gamma difference value outputted from the D/A conversion unit with the video signal outputted from the video source for color correction so as to output the overlapped result to the video processing unit.