CN1949884A - Display apparatus and control method thereof - Google Patents

Display apparatus and control method thereof Download PDF

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Publication number
CN1949884A
CN1949884A CNA2006101437764A CN200610143776A CN1949884A CN 1949884 A CN1949884 A CN 1949884A CN A2006101437764 A CNA2006101437764 A CN A2006101437764A CN 200610143776 A CN200610143776 A CN 200610143776A CN 1949884 A CN1949884 A CN 1949884A
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China
Prior art keywords
color
colour
display unit
unit
white
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CNA2006101437764A
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Chinese (zh)
Inventor
安在弘
朴吉寿
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Publication of CN1949884A publication Critical patent/CN1949884A/en
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    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45C—PURSES; LUGGAGE; HAND CARRIED BAGS
    • A45C1/00—Purses; Money-bags; Wallets
    • A45C1/02—Purses
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45C—PURSES; LUGGAGE; HAND CARRIED BAGS
    • A45C15/00—Purses, bags, luggage or other receptacles covered by groups A45C1/00 - A45C11/00, combined with other objects or articles

Abstract

A display apparatus includes a display unit; a signal processing unit which processes an image signal to be displayed on the display unit; a colour transforming unit which adjusts a white balance of the image signal input from the signal processing unit within a colour area defined by a set of adjacent colours in a colour space; and a controlling unit which controls the colour transforming unit to perform colour-transformation on only a white colour within the colour area of colours of the image signal in order to adjust the white balance of the image signal.

Description

Display unit and control method thereof
Technical field
The present invention relates to a kind of display unit and control method thereof, particularly, the present invention relates to a kind of display unit and control method thereof of improving the picture signal white balance.
Background technology
Usually, display unit particularly color display unit is widely used in providing the user equipment of video information, as TV (TV), digital TV (DTV), thin-film transistor (TFT) display or TV, color printer, digital camera, projector and mobile phone or the like.
In display unit, the show state of shown image can be regulated by processing attribute usually on the display unit, for example imposes on picture signal tone, brightness, saturation of display unit or the like.For example, thus the white balance of shown image can be synthesized by the color that adjusting imposes on the picture signal of display unit and regulated white and regulated on the display unit.
Yet, when regulating white balance in traditional display unit, the tone of all colours of image shown on the display unit and/or the problem that saturation changes can appear.For example, if the blue color increase can make the white color temperature of image shown on the display unit raise, the colour temperature of all colours of shown image also can change on the display unit.That is to say,, the problem that the colour temperature of all colours all changes also can occur even the user only manages to change the colour temperature of white.
Summary of the invention
The invention provides a kind of display unit and control method thereof, can regulate the white balance of picture signal by only changing the white that distributes in the colour gamut.
According to an aspect of the present invention, provide a display unit that comprises the display unit that is used for display image, this display unit comprises: be transfused to the signal input unit that input signal is arranged; Signal processing unit is used for described picture signal, so that make this picture signal can be displayed on the display unit; Color converting unit is used for regulating the white balance from the picture signal of signal processing unit input in by one group of defined colour gamut of a plurality of adjacent colors of color space; And control unit, be used for controlling described color converting unit and only the white of the colour gamut of the color of picture signal carried out the look conversion, so that regulate the white balance of described picture signal.
According to an aspect of the present invention, color converting unit is made as reference color to a kind of color in the colour gamut, and determines the colour switching degree of other color in the colour gamut based on the colour switching degree of this reference color.
According to an aspect of the present invention, color space is the YCbCr color space.
According to an aspect of the present invention, colour gamut is oval, and this ellipse is a coordinate with red and blueness, with the main shaft of color temperature axis as the YCbCr color space, forms an acute angle.
According to an aspect of the present invention, if regulate the white balance of picture signal, control unit is done conversion for the colour temperature that increases white to reference color, so that reference color is near the blue coordinate in the colour gamut; And for the colour temperature that reduces white reference color is done conversion, so that reference color is near the red scale in the colour gamut.
According to an aspect of the present invention, control unit receives control signal with the colour temperature of adjusting from the white of external device (ED), and the control color converting unit makes it to regulate white balance according to the control signal that receives.
According to an aspect of the present invention, control unit shows mode image on display unit, and determines the adjusting condition of the picture signal white balance of regulating in the color converting unit according to the change of mode image.
According to a further aspect in the invention, provide a kind of method for controlling display device that comprises the display unit that is used for display image, comprising: receive picture signal; Handle this picture signal so that this picture signal can be presented on the described display unit; Regulate the white balance of the picture signal of handling by the white of regulating the picture signal of handling in one group of defined colour gamut of a plurality of adjacent colors in by color space.
According to an aspect of the present invention, the adjusting of white balance comprises: a kind of color is set as the reference look in colour gamut, and determines the colour switching degree of other color in the colour gamut based on the colour switching degree of reference color; Definite colour switching degree is depended in the colour switching of a kind of color in the colour gamut.
According to an aspect of the present invention, regulate white balance and comprise: for the colour temperature that increases white reference color is done conversion, so that reference color is near the blue coordinate in the colour gamut; And for the colour temperature that reduces white reference color is done conversion, so that reference color is near the red scale in the colour gamut.
Description of drawings
In conjunction with the accompanying drawings to the description of exemplary embodiments, above-mentioned and/or others of the present invention become apparent with easier to understand from following.
Fig. 1 is the control structure figure of the display unit of an exemplary embodiments according to the present invention;
Fig. 2 A be explanation in the three-dimensional color space and the diagrammatic sketch of colour gamut;
Fig. 2 B is the cutaway view of color space and colour gamut; With
Fig. 3 is the control flow chart of the display unit of exemplary embodiments according to the present invention.
Embodiment
To introduce specific embodiments of the invention in detail now, these embodiment be shown in the accompanying drawing.
Fig. 1 is the control structure figure of the display unit of exemplary embodiments according to the present invention.
As shown in Figure 1, the display unit 100 of exemplary embodiments comprises the display unit 70, signal input unit 10, the signal processing unit 30 that are used for display image, is used for the picture signal of handling at signal processing unit 30 is carried out the color converting unit 50 of conversion and controlled the control unit 90 of these assemblies according to the present invention.
Display unit 70 receives picture signal and display image on screen from color converting unit 50.Display unit 70 comprises the display module (not shown) and the module driver (not shown) of display image thereon, and module driver is handled from the picture signal of color converting unit 50 inputs so that image can show at display module.Display module can comprise dissimilar display modules, and for example cathode ray tube (CRT), digital light are handled (DLP) projector, LCD (LCD), Plasmia indicating panel (PDP) or the like.If the display module here is a DLP projector, module driver just comprises Optical devices.If the display module here is LCD, module driver just comprises that printed circuit board (PCB) is to become data-signal and signal to the image signal transformation from color converting unit 50 inputs.Similarly, according to the type of display module, display unit 70 has a structure corresponding to module driver.
Signal input unit 10 receives picture signal and the picture signal that receives is outputed to signal processing unit 30.Be appreciated that signal input unit 10 can have different structures according to the type of display module.For example, when signal processing unit 30 processing digital images signals, signal input unit 10 can comprise analog digital (A/D) converter so that analog picture signal is transformed into data image signal, comprises that also the separation assembly of supporting low pressure differential signal device (LVDS) or transmitting minimum differential signal device (TMDS) interface is to support the input of data image signal.In addition, when display unit 100 received the TV broadcast singal, signal input unit 10 can comprise tuner.
Signal input unit 10 may further include from external device (ED) 200 and receives the input of command signal to control unit 90, and this will be described afterwards, receives the mode image that wherein comprises pattern when regulating white balance.In this case, mode image be a kind of serve as that the basis determines whether the image that white balance is correctly regulated with it.For example, mode image comprises monochrome image or the multicolor image that contains pattern.In this exemplary embodiments, mode image can receive or is stored in advance the internal storage (not shown) of display unit 100 from external device (ED) 200.In addition, serve as that the basis determines whether that the image that white balance is correctly regulated had both comprised the picture signal that receives from a certain image signal source, also comprised mode image with it.In the following description, explain for convenience, suppose the mode image that contains pattern be included in the corresponding image of picture signal in.
Signal processing unit 30 is the image signal transformation of input from signal input unit 10 to be shown the picture signal that unit 70 shows.Signal processing unit 30 can have different structure according to the type of display module above-mentioned.For example, if display module is LCD, PDP or DLP, signal processing unit 30 can comprise the scaler (not shown) of convergent-divergent data image signal so.If display module is CRT, signal processing unit 30 can comprise the amplifying unit (not shown) of amplification from the picture signal of signal input unit 10 input so, based on vertical and the vertical of horizontal-drive signal deflection beam and horizontal deflection unit (not shown) or the like.In addition, signal processing unit 30 can also comprise the picture signal that the frame buffer (not shown) is imported from signal input unit 10 with temporary transient storage, then the picture signal of storage is exported to scaler.
Control unit 90 control signal processing units 30, color converting unit 50 and signal input unit 10.In this exemplary embodiments, according to receiving command signal to regulate white balance from external device (ED) 200 by signal input unit 10, perhaps according in the memory in advance program stored receive command signal to regulate white balance, 50 pairs of picture signals from signal processing unit 30 outputs of control unit 90 control color converting unit are carried out colour switching.In this case, control unit 90 detects the brightness around the display unit 100 and regulates white balance based on the result who detects or according to display unit 100 set conditions.
50 pairs of picture signals from signal processing unit 30 outputs of color converting unit are carried out colour switching, make like this color that is distributed among the white portion CA in white portion CA by colour switching, white portion CA is defined by one group of color among the color space CS of the color that shows on display unit 70.Refer to a zone of initial point (center) part that concentrates on color space CS here as used white portion CA.
As used here color space CS, be used for color is carried out the logic statement, it refers to a kind of space that can both be expressed at the three-dimensional coordinate system all colours.Here color space preferably but needn't be the YCbCr color space, brightness data is separated from tone data in the YCbCr color space.In this exemplary embodiments, CIELAB (L*a*b) color space that Commission Internationale De L'Eclairage (CIE) is advised or CIELCH (L*C*h) color space also can be used as color space CS.But, be appreciated that not breaking away from spirit of the present invention can use different color spaces as color space CS.
Fig. 2 A shows brightness according to color, the relation between the color harmony saturation and the three-dimensional x-y-z coordinate system of definite YCbCr color space.In this coordinate system, the change of phase place means the change of tone, and the change of distance means the change of saturation and means the change of brightness at the z axle around the change of initial point between the initial point.In this exemplary embodiments, color space CS is a kind of six color spaces by six kinds of primary colours definition, and six kinds of primary colours are respectively: red (R), yellow (Y), green (G), blue or green (C), blue (B) and pinkish red (M).
Colour gamut CA is defined by one group of color among the color space CS.In this case, color converting unit 50 is confirmed white portion according to the geometric equation of colour gamut CA on the three-dimensional coordinate system.For example, if colour gamut CA is oval, color converting unit 50 is confirmed white portion CA according to elliptic equation.
In this embodiment, colour gamut CA is parallel to the x-y plane, that is to say, the colour switching in colour gamut CA can not change the brightness of color, will describe this example below.In this case, the color difference signal of 50 pairs of color harmony saturations of expression color from the picture signal of signal processing unit 30 outputs of color converting unit carries out colour switching, and the change of the tone of color and/or saturation is represented by color difference signal like this.
In this embodiment, colour gamut CA is oval as an example, shown in Fig. 2 B.In this case, ellipse preferably but a color temperature axis not necessarily will be arranged as main shaft, color temperature axis is the basis that colour temperature changes.In this case, white portion CA with corresponding to red and blue coordinate each all topographic feature become acute angle.Therefore, when coordinate colour temperature when blue increases, 25000K for example, when coordinate colour temperature when red reduces, 6500K for example.In other words, under the control of control unit 90, carry out colour switching by the value to color difference signal Cb and Cr, color converting unit 50 can change colour temperature.Especially, when the value of the Cb that contains blue information increased, colour temperature increased; When the value of the Cr that contains red information increased, colour temperature reduced.
Be divided into luminance signal and color difference signal from the picture signal of signal processing unit 30 inputs.Like this, color converting unit 50 the color coordinatess corresponding to color difference signal be transformed into corresponding to control unit 90 controls coordinate.In this case, (x, y) (point among Fig. 2 B a) colour switching is a coordinate (x ', y ') (the some b among Fig. 2 B) to color converting unit 50 coordinate.
Coordinate (x ', y ') obtain according to following equation:
x ′ y ′ = Gx × x Gy × y + Ox Oy
Here Gx is the yield value of x, and Gy is the yield value of y, and Ox is the side-play amount of x, and Oy is the side-play amount of y.
In this embodiment, preferably but be not necessary, if the picture signal that shows on display unit 70 has low gray scale, coordinate (x ', y ') determined by side-play amount, and if the picture signal that on display unit 70, shows have high gray scale, coordinate (x ', y ') determine by yield value.
Color converting unit 50 is provided with a kind of color as the reference look in white portion CA, and determines the colour switching degree of other color among the colour gamut CA based on the colour switching degree of reference color.In other words, when the basis of the reference color in the oval colour gamut was carried out conversion from the control signal of control unit 90, other color except reference color in colour gamut CA was carried out conversion with same ratio.In this case, colour switching degree depends on the shape of colour gamut.
In addition, when the white balance basis of picture signal was regulated from the control signal of control unit 90, in order to increase the colour temperature of white, color converting unit 50 conversion reference colors were so that the blue coordinate among the close colour gamut CA of reference color.And in order to reduce the colour temperature of white, color converting unit 50 conversion reference colors are so that the red scale among the close colour gamut CA of reference color.
Fig. 3 is the control flow chart of the exemplary embodiments display unit 100 according to the present invention.
With reference to figure 3, at operation S11, display unit 100 receives picture signal by signal input unit 10.This picture signal had both comprised from the mode image of pattern output device output, also comprised from for example picture signal of broadcasting station, DVD, VCR or the like image source output.Next step, at operation S13, signal processing unit 30 is handled by the picture signal of signal input unit 10 inputs so that picture signal shows on display unit 70, and treated picture signal is outputed to color converting unit 50.
Next step, at operation S15, based on receiving the white balance of regulating picture signal from the control signal of control unit 90, at operation S19, color converting unit 50 is by carrying out the white balance that picture signal is regulated in colour switching to the color among the white zone C A.Especially, according to the control signal from control unit 90, at operation S17, color converting unit 50 is determined white portion CA; At operation S19, the color of differentiation in determining color region CA and other color, and by only the color among the white zone C A being carried out the white balance that picture signal is regulated in colour switching.
As mentioned above, when regulating the white balance of picture signal, display unit 100 is only adjusted to white color among the look zone C A.That is to say that display unit 100 of the present invention is only regulated the color of colour gamut CA and do not regulated other color, yet traditional display unit changes all colours that shows when regulating white balance on display unit 70.Therefore, no matter during user's intention, can prevent to change the color that on display unit 70, shows when fully.
As mentioned above, exemplary embodiments of the present invention provides a kind of display unit and control method thereof, can be by only changing the white balance that the white that is distributed in the colour gamut is regulated picture signal.
Although provided and described several exemplary embodiments of the present invention, for those skilled in the art clearly, can make a change these embodiment under the condition that does not break away from principle of the present invention and spirit, scope of the present invention is to be limited by additional claims and its equivalent.

Claims (14)

1, a kind of display unit comprises:
Display unit;
Signal processing unit is used to handle the picture signal that will be displayed on the display unit;
Color converting unit is used in by one group of defined colour gamut of adjacent color of color space regulating the white balance of picture signal; And
Control unit is used for controlling described color converting unit and only the white of the colour gamut of the color of picture signal is carried out colour switching, so that regulate the white balance of described picture signal.
2, display unit as claimed in claim 1, wherein, the color in the described color converting unit colour gamut is set to reference color, and determines the colour switching degree of other color in the colour gamut based on the colour switching degree of this reference color.
3, display unit as claimed in claim 2, wherein, described color space is the YCbCr color space.
4, display unit as claimed in claim 3, wherein, described colour gamut is oval, this ellipse is a coordinate with red and blueness, with the main shaft of color temperature axis as the YCbCr color space, forms an acute angle.
5, display unit as claimed in claim 4, wherein, if regulate the white balance of picture signal, then described control unit is done conversion to reference color, make reference color near the blue coordinate in the colour gamut to increase the colour temperature of white; And reference color is done conversion, make reference color near the red scale in the colour gamut to reduce the colour temperature of white.
6, display unit as claimed in claim 5, wherein, described control unit receives control signal with the colour temperature of adjusting from the white of external device (ED), and the control color converting unit makes it to regulate white balance according to the control signal that receives.
7, display unit as claimed in claim 6, wherein, described control unit is presented on the described display unit mode image, and determines the adjusting condition of the picture signal white balance of regulating in described color converting unit according to the change of mode image.
8, a kind of method for controlling display device, this method comprises:
Handling picture signal makes it to show on the display unit of display unit;
Handle white in the picture signal by regulating in one group of defined colour gamut of adjacent color in by color space and regulate the white balance of the picture signal of handling.
9, control method as claimed in claim 8, wherein, regulate white balance and comprise:
Color in the colour gamut is set to reference color;
Determine the colour switching degree of other color in the colour gamut based on the colour switching degree of reference color; And
Definite colour switching degree is depended in the colour switching of a kind of color in the colour gamut.
10, control method as claimed in claim 9, wherein, color space is the YCbCr color space.
11, control method as claimed in claim 10, wherein, colour gamut is oval, and this ellipse is a coordinate with red and blueness, and color temperature axis forms an acute angle as the main shaft of YCbCr color space.
12, control method as claimed in claim 10, wherein regulate white balance and comprise: reference color is done conversion, make reference color near the blue coordinate in the colour gamut to increase the colour temperature of white; And
Reference color is done conversion, make reference color near the red scale in the colour gamut to reduce the colour temperature of white.
13, control method as claimed in claim 12 also comprises from external device (ED) receiving control signal to regulate the colour temperature of white, wherein, regulates white balance according to this control signal.
14, control method as claimed in claim 13 also is included in display mode image on the display unit, and the white balance adjusting condition of the picture signal of determining in color converting unit to be regulated according to the change of mode image.
CNA2006101437764A 2005-10-11 2006-10-11 Display apparatus and control method thereof Pending CN1949884A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR95617/05 2005-10-11
KR20050095617 2005-10-11
KR15092/06 2006-02-16

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101472187B (en) * 2007-12-29 2012-11-21 深圳艾科创新微电子有限公司 System and method for enhancing green of video signal
CN104428829A (en) * 2012-06-21 2015-03-18 华为终端有限公司 Color control method and communication apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101472187B (en) * 2007-12-29 2012-11-21 深圳艾科创新微电子有限公司 System and method for enhancing green of video signal
CN104428829A (en) * 2012-06-21 2015-03-18 华为终端有限公司 Color control method and communication apparatus
US9318038B2 (en) 2012-06-21 2016-04-19 Huawei Device Co., Ltd. Color control method and communication apparatus

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