Television – Image signal processing circuitry specific to television – Display controlled by ambient light
Reexamination Certificate
2002-10-21
2004-11-23
Lee, Michael H. (Department: 2614)
Television
Image signal processing circuitry specific to television
Display controlled by ambient light
C348S602000, C348S655000, C348S223100, C348S227100
Reexamination Certificate
active
06822695
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a surrounding light judging method and a video compensation control apparatus using the same, and in particular to an improved surrounding light judging method and a video compensation control apparatus using the same which are capable of providing an optimum viewing quality by automatically correcting video data in accordance with a surrounding lighting environment of a video displaying instrument.
2. Description of the Conventional Art
Generally, a color adaptation phenomenon is defined as a phenomenon where an original color is recognized by human eyes as another color because the human eyes are made adaptive by a predetermined light such as an incandescent light, a fluorescent light, etc.
Therefore, a television viewer may recognize the colors reproduced by a color picture tube as other colors by the above-described color adaptation phenomenon, so that it is impossible to enjoy the optimum quality of colors. Thus, video data is corrected based on the surrounding light environment using a video correction (compensation) apparatus to provide an optimum quality of colors.
As shown in
FIG. 1
, the conventional video compensation apparatus includes an RGB sensor
10
for detecting RGB data based on the surrounding environment, a key selector
20
, a microcomputer
30
for summing RGB data detected by the RGB sensor
10
and outputting a video compensation data corresponding to the summed value, and a combined video signal processor
40
for processing a combined video signal received through the antenna and recovering a video signal and an audio signal.
The combined video signal processor
40
includes a tuner
11
for selecting a predetermined channel, an IF processor
12
for converting the combined video signal of the selected channel into an intermediate frequency signal, a detector
13
for detecting an intermediate frequency signal from the IF processor
12
and separating the detected intermediate frequency signal into a video intermediate frequency signal and an audio intermediate frequency signal, an audio processor
14
for recovering the audio intermediate frequency signal from the detector
13
and outputting the recovered signal to a speaker
15
, and a video processor
16
for recovering the video intermediate frequency signal from the detector
13
to an RGB signal in accordance with the video compensation data output from the microcomputer
30
.
The operation of the conventional video compensation apparatus will now be explained with reference to the accompanying drawings.
First, after the television is turned on using the key selector
20
, when a predetermined selection key is inputted, the microcomputer
30
outputs a channel selection data based on the output from the key selector
20
.
In addition, the microcomputer
30
receives an RGB data with respect to the surrounding environment detected by the RGB sensor
10
, sums the RGB data (S=D
R
+D
G
+D
B
), compares the previously set control data table shown in
FIG. 2A
with the sum value S of the RGB data, judges the surrounding light level and sets a control data and a W/B (White/Balance) corresponding to the judged surrounding light level.
Namely, as shown in
FIGS. 2A and 3A
, when the sum value (S) is 0≦S≦2, the microcomputer
30
judges the surrounding environment as a dark room, sets the control data as Contrast=30, Brightness=40, Saturation=40, and sharpness=30, and performs a first compensation step in Steps S
3
and S
4
. When the sum value S is 2≦S<45 as in Step S
5
, the control data based on the sum value S is set, and the second through sixth compensation steps are performed as shown in Steps S
5
through S
14
of FIG.
3
A.
In addition, when the sum value S is 45≦S, the microcomputer
30
judges the surrounding light as a daylight sets the control data as Contrast=100, Brightness=60, Saturation=55 and sharpness=60, and performs a seventh compensation step as in Step S
15
.
More particularly, in the first through seventh compensation steps, the microcomputer
30
, as shown in
FIGS. 2B and 3B
, judges that the surrounding light corresponds to a dark room light when the sum value S is S<2, sets the W/B to 9000° K in Steps S
20
through S
23
. When the sum value S is S≧45, the surrounding light is judged as a daylight, and then the W/B is set as 1300° K in Steps S
24
and S
25
. When the sum value S is 2≦S<45, the W/B is set in accordance with the subtracted value between R and B in Step S
26
.
Namely, when the subtracted value S
1
is S
1
≦0, the surrounding light is judged to be a fluorescent lamp, and then the W/B is set as 12000° K in Steps S
27
and S
28
. When the subtracted value is S
1
≦5 the surrounding light is judged to be a fluorescent light and an incandescent lamp, and the W/B is set to 11000° K in Steps S
29
and S
30
. When the subtracted value is S
1
≧5, the surrounding light is judged to be an incandescent lamp, and the W/B is set to 1000° K in Step S
31
.
The control data and W/B determined by the microcomputer
30
based on the detected surrounding light, as described above, are used to adjust video signals prior to being displayed on the tube
17
. For example, the tuner
11
selects a predetermined channel in accordance with the channel selection data from the microcomputer
30
, and the IF processor
12
converts the combined video signal of the selected channel into an intermediate frequency signal. The detector
13
separates the converted intermediate frequency signal into a video intermediate frequency signal and an audio frequency signal.
Consequently, the separated audio intermediate frequency signal is recovered to an audio signal by the audio processor
14
and outputted to the speaker
15
. The video processor
16
receives a video intermediate frequency signal from the detector
13
, compensates the video signals in accordance with the video compensation data set by the microcomputer
30
and the W/B, and displays the compensated video signals on the color picture tube
17
.
However, in the conventional video compensation apparatus, when the brightness of the surrounding light is decreased, the sum value S is decreased. Then, the brightness of the surrounding light may be erroneously detected due to the low sum value S, which can cause a malfunction in the system.
In addition, when the brightness of the surrounding light reaches a certain high value, for example, S≧46, the microcomputer
30
sets the W/B to 13000° K regardless of how high S may be. In this manner, it is impossible to accurately set the W/B based on the judged brightness, especially when the sum value S is high.
Furthermore, in the conventional video compensation apparatus, since the color adaptation phenomenon is not considered, it is impossible to secure a quality picture.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a surrounding light judging method and a video compensation control apparatus using the same which overcome the aforementioned problems encountered in the conventional art.
It is another object of the present invention to provide an improved surrounding light judging method and a video compensation control apparatus which are capable of providing an optimum quality of picture by detecting a color signal near a video displaying instrument, judging a lighting environment from the detected color signal, and automatically correcting video data in accordance with the judged lighting environment and a variation in the lighting environment.
To achieve the above and other objects, there is provided a surrounding light judging method which includes the steps of detecting a first color component and a second color component from a surrounding light, and judging a kinds of the light using the first and second color components.
Additional advantages, objects and features of the invention will become more apparent from the description which follows.
REF
Choi Duk Kyu
Jeon Sung Kyu
Kim Byung Gon
Koo Ja Hwan
Kwon Ki Ryong
Birch & Stewart Kolasch & Birch, LLP
Desir Jean W.
Lee Michael H.
LG Electronics Inc.
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