CN102024441A - Color correction system and method of color sequential display - Google Patents
Color correction system and method of color sequential display Download PDFInfo
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Abstract
The invention provides a color correction system and method of a color sequential display. The invention is characterized in that the mixed-color light brightness values of a first color field, a second color field and a third color field detected by a photoelectric detector are converted into a red pure-color light brightness value, a green pure-color light brightness value and a blue pure-color light brightness value by an arithmetic element according to the matrix operation designed in the invention so as to facilitate subsequent color correction and white balance compensation, thereby achieving the effects of suppressing the color separation phenomenon and maintaining the normal color correction and compensation.
Description
Technical field
The invention relates to a kind of color correcting method, especially for color correcting method in the color sequential display and color thereof
Jiao Zheng Xi System
Background technology
In the LCD in past, need the configuration colored filter in the picture element top, to filter light source, present the color that desire shows, and human eye receives light source shown red, green and blue light that goes out after by colored filter, it can be mixed, and then perception obtains the color of this picture element.Yet the colorized optical filtering sector-meeting influences the light transmittance of LCD integral body, and in addition, colored filter also influences display dot (dot) size of the single picture element of LCD, causes the resolution of LCD to be subjected to the restriction of colored filter.
A kind of look preface method (Color Sequential) LCD in order to improve problems such as above-mentioned resolution and light transmittance, to develop then now.Color sequential liquid crystal display can show three former colour contents of a picture element in regular turn and present color.Each picture element of this kind color sequential liquid crystal display is by three light emitting sources, send red, green respectively and blue light with as backlight.In time, this picture element can be according to red, the green and blue light of the corresponding respectively unlatching of display data at a picture frame.Utilize the persistence of vision of human eye, the people can pick out the color of this picture element.Therefore, color sequential liquid crystal display need not be provided with colored filter, and,, and can improve resolution so color sequential liquid crystal display can reduce cost because the size of each picture element of color sequential liquid crystal display is less than each picture element of tool colored filter LCD.
In order to reach the purpose of white balance compensation and colour correction, in color sequential liquid crystal display commonly used color calibration system roughly as shown in Figure 1, it comprises: time schedule controller 101, delicolor controller 102, light-emittingdiode driver 103, light-emittingdiode 104, gate controller 105, source electrode controller 106, liquid crystal panel 107, and sensor 108.Wherein, sensor 108 is coupled to time schedule controller 101, delicolor controller 102 is embedded in the time schedule controller 101, also can be coupled to time schedule controller 101, light-emittingdiode driver 103 is coupled to time schedule controller 101, and plural light-emittingdiode 104 is coupled to light-emittingdiode driver 103, and gate controller 105 and source electrode controller 106 are coupled respectively to time schedule controller 101, with the start of picture element in the control liquid crystal panel 107.Wherein, arithmetic element or delicolor controller 102 also can be arranged at outside the time schedule controller 101, and be coupled to time schedule controller 101, and need not be confined in the time schedule controller 101.The type of drive of picture element is distinguished output voltages to gate controller 105 and source electrode controller 106 by time schedule controller 101, and then the pixel voltages in the control liquid crystal panel 107, and the delicolor controller 102 in time schedule controller 101 can provide brightness value after light-emittingdiode driver 103 is proofreaied and correct according to a question blank (look up table), thereby driven for emitting lights diode 104 shows suitable color and white balance, wherein, question blank can be stored in time schedule controller 101 or the delicolor controller 102.Sensor 108 can comprise color detector, temperature detecting device, reach optical detector, and according to dissimilar sensor 108, the operation principles of this color calibration system comprises following three kinds:
First kind is utilize that color photo sensors (color sensor) detecting RGB light-emittingdiode radiated red, green, and blue light strength, be resent to time schedule controller (Timing Controller, TCON) delicolor controller in, see through wherein computing and compensation mechanism, again by the load or the electric current of the above-mentioned light-emittingdiode of light-emittingdiode driver control, showing required brightness, thereby reach the purpose of colour correction.
Second method is to utilize the temperature variation of temperature-sensitive sticker (temperature sensor) detecting light-emittingdiode, and will detect the result and feedback to delicolor controller, adjust the load or the electric current of above-mentioned light-emittingdiode according to the question blank of temperature and red, green, blue light-emittingdiode, and then reach the purpose of colour correction.
The third method is to utilize the mode of OPTICAL SENSORS (light sensor) with the timesharing detecting, obtain the brightness value of red, green, blue light-emittingdiode respectively, and will detect the result and feedback to delicolor controller, see through question blank and judge whether the brightness of above-mentioned arbitrary light-emittingdiode decays, if check in brightness decay, then can compensate its brightness, being adjusted to required white balance, and then reach the purpose of colour correction at the light-emittingdiode of decay.
Because color sequential liquid crystal display is to utilize the sprite of three continuous colour fields to be projected in the human eye in regular turn, with synthetic chromatic image in brain, if so (for example: when the display transfixion have a relative velocity between human eye and the image, human eye is moving, or when display moves, the human eye transfixion), three sprites that then cast out can't be overlapping completely effectively on retina, and produce the phenomenon of dislocation at image edge, accumulation via persistence of vision, to make human eye can't watch image clearly, thereby have a strong impact on the image quality of display that this phenomenon is called look again and separates (color breakup) phenomenon.
Along with science and technology constantly breaks through with progressive, the method of many head it offs has been proposed in recent years, modal is the sub-colour field of inserting other colors in each colour field of color sequential liquid crystal display, utilize the superposition principle of color, the color distortion that makes the edge stagger dwindles, and then suppresses the perception that human eye is checked colors and separated.For example: RGBW look preface method, RGBCY look preface method, WmaxRGB, RwGwBw look preface method, RwGwBwGw look preface method or the like.
Yet, though said method can effectively suppress the generation of look segregation phenomenon, but because each colour field all can be inserted the sub-colour field of other colors, but not single color, therefore, during as if the detecting of use OPTICAL SENSORS, only can obtain the brightness of mixed light, but not monochromatic brightness, so can't carry out the correction and the compensation of color.
Therefore, in the relevant technology of color sequential display,, still exist some technical difficulties with to be overcome if will suppress the look segregation phenomenon simultaneously and keep normal colour correction and compensation.
Summary of the invention
In order to overcome above-mentioned difficulties and shortcoming, the invention provides a kind of color correcting method, particularly in order to color correcting method and system on the color sequential display that suppresses the look segregation phenomenon.
A present invention wherein purpose is that the mixed light brightness that OPTICAL SENSORS is detected is converted into the pure color luminance brightness of red, green, blue, in order to the correction and the compensation of color.
Another object of the present invention is to provide a kind of color sequential display that can suppress the look segregation phenomenon simultaneously and keep normal colour correction and compensate function.Must notice that above-mentioned look preface method can comprise, but is not limited to, RGBW look preface method, RGBCY look preface method, WmaxRGB, RwGwBw look preface method, RwGwBwGw look preface method.
In order to achieve the above object, the invention provides a kind of color correcting method of color sequential display, its step comprises: the brightness value (R that is detected first colour field, second colour field and the 3rd colour field by an OPTICAL SENSORS
W, G
W, B
W); Utilize an arithmetic element to carry out computing at the detecting result of above-mentioned OPTICAL SENSORS, red to obtain, green, and blue pure color brightness values (R, G, B); By a color controller above-mentioned pure color brightness values red, green, that reach indigo plant is proofreaied and correct; After above-mentioned delicolor controller proofreaied and correct above-mentioned red, green, and blue pure color brightness values be sent to a light-emittingdiode driver; Wherein, the brightness value of above-mentioned first colour field is defined as R
W=R+xG+iB, the brightness value of above-mentioned second colour field is defined as G
W=mR+G+jB, the brightness value of above-mentioned the 3rd colour field is defined as B
W=nR+yG+B, wherein, 0≤x, y, i, j, m, n＜1, and being following column matrix, above-mentioned arithmetic element carries out computing:
On the other hand, the present invention further provides a kind of color calibration system of color sequential display, comprises: an OPTICAL SENSORS, and in order to detect the brightness value (R of first colour field, second colour field and the 3rd colour field
W, G
W, B
W); Time schedule controller, electrical couplings is to above-mentioned OPTICAL SENSORS; One arithmetic element is positioned at above-mentioned time schedule controller, carries out computing in order to the detecting result at above-mentioned OPTICAL SENSORS, and red to obtain, green, as to reach indigo plant pure color brightness values (R, G, B); One color controller, electrical couplings are proofreaied and correct in order to the pure color brightness values at above-mentioned red, green, blue in above-mentioned time schedule controller and above-mentioned arithmetic element; And a light-emittingdiode driver, electrical couplings is to above-mentioned time schedule controller, in order to receive above-mentioned red, green, and the blue pure color brightness values after proofreading and correct; Wherein, the brightness value of above-mentioned first colour field is defined as R
W=R+xG+iB, the brightness value of above-mentioned second colour field is defined as G
W=mR+G+jB, the brightness value of above-mentioned the 3rd colour field is defined as B
W=nR+yG+B, wherein, 0≤x, y, i, j, m, n＜1, and being following column matrix, above-mentioned arithmetic element carries out computing:
By above technological means, OPTICAL SENSORS can be detected the mixed light brightness value that obtains is converted to the red, green, blue light-emittingdiode and sends real pure color brightness values, thereby can effectively carry out follow-up colour correction and compensation, to show suitable color and white balance.
The above in order to illustrate purpose of the present invention, reach this purpose technological means, with and the advantage that produces or the like.And the present invention can and follow back accompanying drawing formula and claim to make the reader be known understanding from the narration of following preferable enforcement.
Description of drawings
Fig. 1 describes known color calibration system.
Fig. 2 describes the embodiment of color calibration system of the present invention.
Fig. 3 describes the brightness and the current relationship of light-emittingdiode.
Fig. 4 describe the present invention first, second, and the embodiment of the 3rd colour field.
Fig. 5 describes process flow diagram of the present invention.
[main element symbol description]
101 time schedule controllers
102 delicolor controllers
103 light-emittingdiode drivers
104 light-emittingdiodes
105 gate controllers
106 source electrode controllers
107 liquid crystal panels
108 sensors
201 arithmetic elements
202 OPTICAL SENSORS
301 first colour fields
302 second colour fields
303 the 3rd colour fields
The 401-407 step
Embodiment
The present invention will be narrated with preferred embodiment and viewpoint, and this type of narration is to explain structure of the present invention and step, only in order to explanation but not in order to restriction the present patent application claim.Therefore, the preferred embodiment, the present invention also can extensively be rendered among other embodiment in instructions.
The present invention utilizes an arithmetic element, also see through matrix operation according to the brightness of light-emittingdiode and the proportionate relationship of electric current, with the mixed light brightness transition that OPTICAL SENSORS detected is the pure color luminance brightness of red, green, blue, is beneficial to correction and compensation that question blank carries out color.
At first introduce the disclosed color calibration system of the present invention, can consult Fig. 2 in this, this figure describes a kind of preferred embodiment that utilizes the color sequential display of color calibration system of the present invention, and it comprises: time schedule controller 101, a color controller 102, a light-emittingdiode driver 103, plural light-emittingdiode 104, a gate controller 105, one source pole controller 106, a liquid crystal panel 107, an arithmetic element 201, and OPTICAL SENSORS 202.Wherein, arithmetic element 201 can be embedded in the delicolor controller 102, and delicolor controller 102 is coupled in time schedule controller 101.In part embodiment, arithmetic element 201, delicolor controller 102 also can place outside the time schedule controller 101, and the three is separated from each other and electrical couplings each other.OPTICAL SENSORS 202, light-emittingdiode driver 103 are coupled respectively to time schedule controller 101, and gate controller 105 and source electrode controller 106 also are coupled respectively to time schedule controller 101, with the start of picture element in the control liquid crystal panel 107.And plural light-emittingdiode 104 is coupled to light-emittingdiode driver 103, so that required color to be provided.OPTICAL SENSORS 202 is coupled to time schedule controller 101, it can detect the brightness value of a plurality of colour fields by the mode of timesharing detecting, and only need three colour fields can calculate the brightness value of pure color light, after obtaining the brightness value of at least three colour fields, the mixed light brightness value that OPTICAL SENSORS 202 can obtain detecting is sent to delicolor controller 102, and arithmetic element 201 can will obtain its detecting result row operation of going forward side by side by delicolor controller 102, to obtain the brightness value of pure color light.Delicolor controller 102 can receive the pure color brightness values after 201 computings of arithmetic element; and, check the whether normal or decay of above-mentioned pure color brightness values according to question blank, carry out the compensation of brightness value again by the result; wherein, question blank can be stored in delicolor controller 102 or the time schedule controller 101.In addition, the type of drive of liquid crystal picture element is to distinguish output voltages to gate controller 105 and source electrode controller 106 by time schedule controller 101, and then the pixel voltages in the control liquid crystal panel 107, and it is known by this area skill person, so do not give unnecessary details.
The applied look preface of the present invention method can comprise RGBW look preface method, RGBCY look preface method, WmaxRGB, RwGwBw look preface method, RwGwBwGw look preface method or the like, yet all non-independent pure color light in each colour field of above-mentioned look preface method, and the mixed light of other colors of doped portion, that is, suppose that first colour field that OPTICAL SENSORS 202 is detected is mainly ruddiness, then its brightness that detects is R
W=R+G
r+ B
r, wherein R is the pure color luminance brightness of required redness, and G
rAnd B
rBe respectively green emitting diode and blue-light-emitting diode in the shown brightness of this colour field; If second colour field is mainly green glow, then its brightness is G
W=R
g+ G+B
g, wherein G is the pure color luminance brightness of required green, and R
gAnd B
gBe respectively emitting red light diode and blue-light-emitting diode in the shown brightness of this colour field; If the 3rd colour field is mainly blue light, then its brightness is B
W=R
b+ G
b+ B, wherein B is the pure color luminance brightness of required blueness, and R
bAnd G
bBe respectively emitting red light diode and green emitting diode in the shown brightness of this colour field.Must notice that the order of above-mentioned first colour field, second colour field, the 3rd colour field is an embodiment only, be in order to explanation, and unrestricted the present invention.
For the brightness (R in the above-mentioned mathematical expression, G, B) that obtains pure color light, the present invention can utilize arithmetic element 201, carry out computing according to the brightness of light-emittingdiode and the relation of electric current, can consult Fig. 3 in this, it is the graph of a relation of light-emittingdiode brightness and electric current, by can obviously finding out among the figure, the brightness of light-emittingdiode and current curve are broadly divided into linear zone and saturation region, for the ease of control, usually operate in linear zone, in other words, the brightness of its demonstration is a certain proportion of linear relationship with the electric current that applies.Therefore, R, R
gAnd R
bBe linear relationship, so may be defined as R
g=mR, R
b=nR is because R
gAnd R
bOnly be doped in the part ruddiness brightness value of second colour field and the 3rd colour field, thus must be less than R, so m, n should be less than 1; In like manner as can be known, G, G
rAnd G
bBe linear relationship, then may be defined as G
r=xG, G
b=yG, and because G
rAnd G
bOnly be doped in the part green glow brightness value of first colour field and the 3rd colour field, thus must be less than G, so x, y should be less than 1; Similarly, can be with B
rAnd B
gBe defined as B
r=iB, B
g=jB is because B
rAnd B
gOnly be doped in the part blue light brightness value of first colour field and second colour field, must be less than B, so i, j should be less than 1.After changing with coalgebra, the first colour field brightness value may be defined as R
W=R+xG+iB, the brightness value of second colour field are G
W=mR+G+jB, the brightness value of the 3rd colour field are B
W=nR+yG+B.According to above-listed mathematical expression, arithmetic element 201 can be carried out computing based on following column matrix:
Cause
So
Wherein, m, n, x, y, i, j are set by the user, in order to eliminate the look segregation phenomenon, so these numerical value are known number.And R
W, G
WAnd B
WBeing to be detected in the mode of timesharing detecting by OPTICAL SENSORS 202 to learn, also is known number, therefore, R, G, the B value can be learnt by these known numbers and the calculating of above-mentioned mathematical expression, thereby obtain the pure color brightness values of red, green, blue, in order to follow-up colour correction and compensation.Must note,, still can utilize look-up table to obtain both relations, be beneficial to obtain the pure color brightness values according to the specification (spec) of light-emittingdiode if the light-emittingdiode brightness and the electric current that use do not have absolute linear relationship.
Can consult Fig. 4 in this, this figure is an embodiment who discloses the present invention's first, second, third colour field, can observe the emitting red light diode in the brightness R of first colour field 301 for the highest, display brightness in second colour field 302 is 0.3R, display brightness in the 3rd colour field 303 is 0.2R, that is m=0.3, n=0.2; The green emitting diode for the highest, is 0.1G in the brightness of first colour field 301 in the display brightness G of second colour field 302, also is 0.1G in the brightness of the 3rd colour field 303, that is x=0.1, y=0.1; The blue-light-emitting diode for the highest, is 0.2B in the display brightness of first colour field 301 in the brightness B of the 3rd colour field 303, is 0.1B in the display brightness of second colour field 302, that is i=0.2, j=0.1.Suppose that brightness R is 80 nits (nits), brightness G is 200 nits, and brightness B is 20 nits, can calculate that then the first colour field brightness that OPTICAL SENSORS detects should be R
W=80+0.1G+0.2B=80+20+4=104, the second colour field brightness should be G
W=0.3R+200+0.1B=226, the 3rd colour field brightness should be B
W=0.2R+0.1B+20=56, bringing above numerical value into aforementioned matrix, to carry out computing as follows:
By the resulting R=80 as a result of above-mentioned matrix, G=200, B=20 equates fully with the numerical value of original hypothesis, and then proof the present invention can obtain correct pure color brightness values.
See also Fig. 5, this figure is an explanation implementing procedure of the present invention, its step is as described below: at first, when step 401, start display by the user, then, when step 402, determine by time schedule controller or delicolor controller whether module backlight is opened, open if determine, then enter step 403, utilize the colour field sensor to detect the mixed light brightness value (R of first colour field, second colour field, the 3rd colour field in the mode of timesharing detecting
W, G
W, B
W), then in step 404, confirm by time schedule controller or delicolor controller whether detecting is finished, if do not finish as yet, then return step 403 and continue detecting,, promptly enter in the step 405 if finish, utilize arithmetic element according to above-mentioned matrix, be converted to the mixed light brightness value red, green, blue pure color brightness values (R, G, B), then, enter in the step 406, proofread and correct at above-mentioned pure color brightness values by delicolor controller, particularly, delicolor controller can judge whether the pure color brightness values decays or unusually according to question blank, and compensates at decay or unusual brightness value.At last, in step 407, the pure color brightness values after will being proofreaied and correct by time schedule controller is sent to the light-emittingdiode driver, to drive plural light-emittingdiode, shows the color after proofreading and correct, thereby reaches the purpose of white balance compensation and colour correction.
Above-mentionedly be stated as preferred embodiment of the present invention.The skill person in this field is deserved to be in order to explanation the present invention but not in order to limit the patent right scope that the present invention was advocated to understand it.Its scope of patent protection when on appended claim and etc. same domain decide.All skill persons who is familiar with this field, in not breaking away from this patent spirit or scope, the change of doing or retouching all belong to the equivalence of being finished under the disclosed spirit and change or design, and should be included in the described claim.
Claims (10)
1. the color correcting method of a color sequential display is characterized in that, its step comprises:
Detect the brightness value (R of one first colour field, one second colour field and one the 3rd colour field by an OPTICAL SENSORS timesharing
W, G
W, B
W); Utilize an arithmetic element to carry out computing at the detecting result of this OPTICAL SENSORS, red to obtain, green, and blue pure color brightness values (R, G, B); Pure color brightness values red, green to this by a color controller, that reach indigo plant is proofreaied and correct; And after this delicolor controller proofreaied and correct should be red, green, reach blue pure color brightness values and be sent to a light-emittingdiode driver.
2. the color correcting method of color sequential display according to claim 1 is characterized in that, wherein, the brightness value of this first colour field is defined as R
W=R+xG+iB, the brightness value of this second colour field is defined as G
W=mR+G+jB, the brightness value of the 3rd colour field is defined as B
W=nR+yG+B, wherein, 0≤x, y, i, j, m, n＜1, and being following column matrix, this arithmetic element carries out computing:
3. the color correcting method of color sequential display according to claim 1 and 2 is characterized in that, also includes the detecting result who is received this OPTICAL SENSORS by time schedule controller in addition, and is sent to this arithmetic element and carries out computing.
4. the color correcting method of color sequential display according to claim 3 is characterized in that, wherein this delicolor controller is that this red, green, blue pure color brightness values after will being proofreaied and correct by this time schedule controller is sent to this light-emittingdiode driver.
5. the color correcting method of color sequential display according to claim 1 is characterized in that, also include in addition by this light-emittingdiode driver according to after proofreading and correct should be red, green, reach blue pure color brightness values and drive plural light-emittingdiode.
6. the color correcting method of color sequential display according to claim 1, it is characterized in that, wherein this delicolor controller be according to a question blank (look up table) judge that this is red, green, and blue pure color brightness values whether decay, and compensate at the pure color brightness values of this decay.
7. the color calibration system of a color sequential display is characterized in that, comprises:
One OPTICAL SENSORS is detected the brightness value (R of one first colour field, one second colour field and one the 3rd colour field in order to timesharing
W, G
W, B
W);
Time schedule controller, electrical couplings is to this OPTICAL SENSORS;
One arithmetic element is arranged in this time schedule controller, carries out computing in order to the detecting result at this OPTICAL SENSORS, and red to obtain, green, as to reach indigo plant pure color brightness values (R, G, B);
One color controller, electrical couplings are proofreaied and correct in order to the pure color brightness values at this red, green, blue to this arithmetic element; And
One light-emittingdiode driver, electrical couplings be to this time schedule controller, in order to receive after proofreading and correct should be red, green, reach blue pure color brightness values.
8. the color calibration system of color sequential display according to claim 7 is characterized in that, wherein, the brightness value of this first colour field is defined as R
W=R+xG+iB, the brightness value of this second colour field is defined as G
W=mR+G+jB, the brightness value of the 3rd colour field is defined as B
W=nR+yG+B, wherein, 0≤x, y, i, j, m, n＜1, and being following column matrix, this arithmetic element carries out computing:
9. according to the color calibration system of claim 7 or 8 described color sequential displays, it is characterized in that, also comprise plural light-emittingdiode in addition, be coupled to this light-emittingdiode driver, in order to show red, green, and the blue pure color brightness values of after this correction this.
10. the color calibration system of color sequential display according to claim 7, it is characterized in that, wherein this delicolor controller be according to a question blank (look up table) judge that this is red, green, and blue pure color brightness values whether decay, and compensate at the pure color brightness values of this decay.
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