TW201337903A - Method of introducing white brightness parameter of display panel into white optical feature based on display panel for calculating gray-level white balance gain value to increase its gray-level white balance adjustment precision - Google Patents

Abstract

The present invention provides a method of introducing white brightness parameter of display panel into white optical feature based on display panel for calculating gray-level white balance gain value to increase its gray-level white balance adjustment precision. The method is applied in a display device and includes the steps of: configuring hue coordinates of the known ideal white color, red color, green color and blue color, respectively, assuming their brightness values, and using a CIE XYZ colorimetric system to convert the above hue coordinates and brightness values of the ideal white color, red color, green color and blue color into three stimulus values; next displaying a plurality of full-white image screens of different gray-levels on the panel, respectively, and using a measurement device to measure the panel for obtaining three stimulus values of an original white color, a set of background stimulus values, and a plurality of brightness parameters, respectively; subtracting the set of background stimulus values from the three stimulus values of the ideal white color, the red color, the green color, the blue color and the original white color, respectively, so as to obtain a set of first corrected stimulus values, a set of second corrected stimulus values, a set of third corrected stimulus values, a set of fourth corrected stimulus values, and a set of fifth corrected stimulus values; then determining a first mixing ratio and a second mixing ratio according to Grsassmann color law with which the set of first corrected stimulus values and the set of fifth corrected stimulus values can be formed by mixing the set of second corrected stimulus values, the set of third corrected stimulus values and the set of fourth corrected stimulus values based on a predetermined mixing ratio; determining a set of gain constants according to the first mixing ratio and the second mixing ratio; and determining a gray-level brightness curve value of the panel from the plurality of brightness parameters, and correcting the set of gain constants with the gray-level brightness curve value so as to obtain a set of adjustment gain values. Accordingly, the display device is able to make use of the color presentation of the panel automatically adjusted by the set of adjustment gain values to effectively solve the problem of wasting time and manpower caused by manually adjusting the gray-level white balance in the prior art. Furthermore, because the white brightness parameter of the display device has been corrected, the consistency of screen presentation of the display device can thus be increased.

Description

Introducing the white brightness parameter of the display panel into the method of calculating the gray scale white balance gain value according to the white optical characteristic of the display panel to improve the gray scale white balance adjustment accuracy

The invention relates to a method for adjusting the gray scale white balance of a display, in particular to automatically measuring and adjusting the gray scale white balance of the display, and improving the precision of the adjustment by detecting the white brightness parameter of the display panel. The method is to solve the labor and labor cost of the traditional manual adjustment, and the display can display the best color performance.

In order to achieve communication with the user, many electronic devices (such as televisions, personal computers, digital photo frames, personal digital assistants, or smart phones) have a display so that the user can pass through one of the displays. The panel views various information presented thereon. As the medium of visual information, the display performance of the display has always been the focus of research and development in related technical fields. Therefore, in order to achieve a certain degree of correctness and consistency in the display performance of the display, the manufacturer must adjust the grayscale white balance of each display one by one before shipment. The conventional method is to measure the device. Measure the color temperature and color deviation of each display when it is white, and then manually adjust the gain values (Gain) of the red, green and blue primary colors of each display until the white color is close to the target color temperature and color deviation. until. However, this manual adjustment of the gray scale white balance parameter is not only very time consuming and labor intensive, but also difficult to avoid human error in the process of adjustment, so that the efficiency of the adjustment work is very low.

In order to speed up the adjustment of the gray-scale white balance parameters, in order to save time and labor costs, some manufacturers will select one display from each batch of displays to adjust the gray-scale white balance parameters. School work, 嗣, a set of gain values of the three primary colors of red, green, and blue obtained by adjusting the display, as a gain value for adjusting other displays produced in the same batch, in short, the same batch production The display is tuned by a fixed set of gain values. Check, due to the material and process of the panel, even the display of the same brand, the same process and the same batch of production, after the production and assembly, the color performance between the individual displays will certainly have a considerable degree of difference Therefore, this adjustment method speeds up the adjustment of the gray scale white balance of the display, and saves a lot of time and labor costs. However, it cannot sacrifice the difference in color characteristics between different displays, and sacrifices. The color performance of most monitors, so that the color performance of the display can not be consistent, so there is still the problem of unstable shipping quality.

In order to solve the above problems, the inventors have proposed a method for automatically measuring and adjusting the gray scale white balance of a display, such as the method disclosed in Taiwan Patent No. I316822, which inputs a digital information of a white screen to a a display for displaying an actual white picture on the panel of the display, and measuring the measured chromaticity value and the measured brightness value of the actual white picture, 嗣, calculating according to the colorimetric Grasman color matching law, Calculating a set of gain constants required to convert the measured chromaticity value and the measured luminance value of the actual white picture into an ideal chromaticity value and an ideal brightness value of an ideal white picture, and setting the set of gain constants to the display In order to enable the display to process the digital information of the subsequent input according to the set of gain constants, and to present an image conforming to the ideal picture performance, thus, the automatic realization can be achieved under the premise of taking into account the difference in color performance of the respective displays. Adjust the grayscale white balance of the display.

Although the method designed by the inventor has greatly improved the convenience and correctness of the display calibration, the inventor believes that the method is still not perfect, and the reason is that the panel of the display not only has a considerable difference in color performance. The gamma curve of each panel is also different. Therefore, after the adjustment of each display by the above method, the screen performance of the display will still be different, so how to adjust the display technology In order to enable the relevant manufacturers to improve the quality of the technology and produce higher quality products, it is the subject of the present invention.

In order to ensure that all the screens of the display can achieve certain correctness and consistency, and under this premise, a calibration technique for automatically adjusting the gray scale white balance of the display is provided, and the inventor has been immersed in relevant technical fields for many years. Long-term careful research and verification has developed a method for introducing the white brightness parameter of the display panel into the gray-scale white balance gain value according to the white optical characteristics of the display panel to improve the gray-scale white balance adjustment accuracy.

The object of the present invention is to provide a method for introducing a white brightness parameter of a display panel into a gray scale white balance gain value according to a white optical characteristic of the display panel to improve the gray scale white balance adjustment accuracy, and the method is applied to The display includes the following steps: respectively setting the chromaticity coordinate values of the known ideal white, red, green, and blue, and respectively assuming the brightness value thereof, and then using the CIE XYZ color system to make the ideal white, red, green, The blue chromaticity coordinate value and the brightness value are converted into three stimuli values; then, a plurality of white image images of different gray scale values are respectively displayed on the panel, and the panel is measured by the measuring device to obtain respectively a raw white tristimulus value, a set of background stimulus values, and a plurality of brightness parameters; the ideal white, the red, the green, the blue, and the original white are respectively deducted from the set of background stimulus values to respectively Obtaining a set of first modified stimulus values, a set of second modified stimulus values, a set of third modified stimulus values, a set of fourth modified stimulus values, and a set of fifth corrected stimulus values嗣, according to Glassman's color matching law, the first modified stimulation value and the fifth modified stimulation value of the group can be respectively determined by the second modified stimulation value, the third modified stimulation value of the group, and the fourth modified stimulus of the group The values are mixed according to a certain mixing ratio, and a first mixing ratio and a second mixing ratio are respectively determined; a set of gain constants is obtained according to the first mixing ratio and the second mixing ratio; The parameter is used to obtain a grayscale brightness curve value of the panel, and the set of gain constants is corrected by the grayscale brightness curve value to obtain a set of calibration gain values. In this way, the display can automatically adjust the color performance of the panel according to the set of adjustment gain values, so as to effectively solve the problem of time and labor waste caused by the traditional manual adjustment of the gray scale white balance, and since it has been targeted to the panel The light leakage factor and the gray scale brightness curve value are corrected, so that the consistency of the display performance of the display can be improved.

For your convenience, the review committee can have a better understanding and understanding of the purpose, construction device, technical features and efficacy of the present invention. The embodiments are combined with the drawings, and the details are as follows:

The invention relates to a method for introducing a white brightness parameter of a display panel into a gray scale white balance gain value according to a white optical characteristic of the display panel to improve the gray scale white balance adjustment precision, and the method is applied to a display, and When the display receives an input signal carrying the original white information and displays an original white color on the panel of the display according to the input signal, the method can measure and obtain a set of original stimulus values of the original white. A certain calculation method is used to obtain a set of adjustment gain values, so that the input signal can be converted into an output signal by the set of adjustment gain values, so that the display can be presented on the panel according to the output signal. An ideal white. The calculation method used in the method is based on the principle described by Grassmann's color matching law, that is, a natural law in which any color light can be mixed with three primary colors of red, green and blue, and a set of gain constants is obtained, and The gray scale brightness curve value of the panel corrects the set of gain constants to obtain the set of tuning gain values.

The principles of the present invention are described in order to clearly identify the technical background to which the invention is based. According to the CIE 1931 color system developed by the Commission Intornation De'l E'clairage (CIE) in 1931, it can be perceived by humans through three stimulus value parameters X , Y and Z. The color is described, that is, if one ideal white W _{i at} a target color temperature is to be described by the CIE 1931 color system, the ideal white W _i is expressed by the tristimulus values X _wi , Y _wi and Z _wi as follows:

W _i ( X _wi , Y _wi , Z _wi )

Similarly, the red R _i , the green G _i and the blue B _i in the chromaticity space can be expressed by their tristimulus values as follows:

R _i ( X _ri , Y _ri , Z _ri )

G _i ( X _gi , Y _gi , Z _gi )

B _i ( X _bi , Y _bi , Z _bi )

Further, when the display receives a carry input signal one of the original white information, and the input signal is displayed by an original white W _p, it can be measured by means of the direct measurement of the original white W _p to the one display panel And defining the original white W _p stimuli value as a set of original stimuli values X _wp , Y _{wp ,} and Z _wp . At this time, the original white W _p can be expressed by the set of original stimulus values as follows:

W _p ( X _wp , Y _wp , Z _wp )

In view of the fact that the degree of light leakage between different panels in the black screen is not the same, the above-mentioned respective stimulation values are further corrected, so as to eliminate the error caused by the difference in the degree of light leakage between the respective panels, so that After the monitor is tuned, its picture performance can be more correct and consistent. For the technique for eliminating light leakage in the present invention, the principle is as follows:

When the display receives another input signal and the other input signal carries image information of a grayscale value of zero (ie, a full black image), the display can display one of the grayscale values on the panel. The background picture W ₀ , at this time, the background picture W ₀ is measured by the measuring device, and the three stimulus values of the background picture W _{0 are} defined as a set of background stimulation values X _{w 0} , Y _{w 0} and Z _{w 0} At this time, the background image W ₀ can be expressed by the set of background stimulus values as follows:

W ₀ ( X _{w 0} , Y _{w 0} , Z _{w 0} )

Deducting the set of background stimulus values of the background image W ₀ from the three stimulus values of the ideal white W _i to obtain a set of first modified stimulus values And subtracting the set of background stimulus values of the background image W ₀ from the three stimulus values of the red R _i to obtain a set of second modified stimulus values And subtracting the set of background stimulus values of the background image W ₀ from the three stimulus values of the green G _i to obtain a set of third modified stimulus values And subtracting the set of background stimulus values of the background image W ₀ from the three stimulus values of the blue B _i to obtain a set of fourth modified stimulus values And subtracting the set of background stimulus values of the background image W ₀ from the original white W _p stimulus value to obtain a set of fifth modified stimulus values . According to the present invention, the three stimulus values of the ideal white W _i , the red R _i , the green G _i , the blue B _{i ,} and the original white W _p are performed according to the following formulas (1) to (5). The following corrections:

Oh, according to the principle described by Glassman's color law, the first modified stimulus of the group The second corrected stimulus value of the group The third modified stimulus value of the group And the fourth modified stimulus value of the group It is mixed according to a certain mixing ratio. Therefore, it is defined as a first mixing ratio M ₁ , and the first mixing ratio M ₁ is a mixing ratio value m _ri , m _{gi of} each of the modified stimulation values. m _{bi is} expressed as follows:

M ₁ ( m _ri , m _gi , m _bi )

That is, the first corrected stimulus value of the group of unit brightness , the second modified stimulus of the group of m _ri units , the third modified stimulus value of the group of m _gi units And the fourth modified stimulus value of the group of m _bi units Formed by co-mixing, as shown in the following formula (6):

Similarly, according to the principle described by Glassman's color law, the fifth modified stimulus The second corrected stimulus value of the group The third modified stimulus value of the group And the fourth modified stimulus value of the group It is mixed according to a certain mixing ratio. Therefore, it is defined as a second mixing ratio M ₂ , and the second mixing ratio M ₂ is a mixing ratio value m _rp , m _{gp of} each of the modified stimulation values. And m _{bp is} expressed as follows:

M ₂ ( m _rp , m _gp , m _bp )

That is, the original white W _{p of} a unit brightness is formed by mixing the red R _i of the m _rp unit, the green G _i of the m _gp unit, and the blue B _i of the m _bp unit, as in the following formula ( 7) shown:

To make the display upon receiving the input signal, the input signal can be converted into an output signal for enabling the display by the output signal can, over the screen showing the image of the white line with W _i on the panel, not directly by the input signal, presented on the panel screen of the image matches the white W _p of the original, so that, by the first mixing ratio and second mixing M ₁ ratio M _2, to obtain the input signal into the desired output signal one set of gain constant C, the gain constant C can be set to each of the gain constant c _r, c _g c _b and is expressed as follows:

C ( c _r , c _g , c _b )

Since the set of gain constants C corresponds to the ratio of the first mixing ratio M ₁ and the second mixing ratio M ₂ , the set of gain constants C is between the first mixing ratio M ₁ and the second mixing ratio M ₂ . The relationship will be as shown in the following formula (8):

In order to enable the panels having different gray-scale luminance curves (Gamma Curve) to exhibit the same picture performance, the present invention particularly introduces a gray-scale luminance curve value γ _W associated with the white luminance parameter in each panel. The set gain constant C is corrected by the gray scale brightness curve value γ _W , and then a set of adjustment gain values G suitable for each panel is obtained, and the set of adjustment gain values G can be adjusted by each gain value. G _r , G _g and G _{b are} expressed as follows:

G ( G _r , G _g , G _b )

The gray level brightness curve value γ _W is obtained by inputting an input signal carrying white information of different gray level values to the display, so that the display can display the white color of the complex array with different gray scale values on the panel. At the same time, the measurement device separately measures and acquires a plurality of brightness parameters of the white picture presented by the panel, and calculates the gray level brightness curve value γ _W of the panel according to the brightness parameters. Check, commonly used in the gray scale brightness curve correction formula is shown in the following formula (9):

Output brightness = (maximum brightness - minimum brightness) ‧ (gray scale value / 255) ^γ + minimum brightness... (...)

Wherein the gamma-based gray-scale brightness curve value, therefore, the respective adjustment gain values G _r , G _g and G _{b of} the set of adjustment gain values G can be obtained by the formula shown in the following formula (10):

However, the present invention is not limited thereto. The method provided by the present invention can obtain the same grayscale luminance curve value γ _W according to the grayscale luminance curve value γ _W corresponding to a white panel of a panel. Obtaining a set of gain constants C from the panel for correction, thereby obtaining a set of adjustment gain values G , so that the display can gain other subsequent input signals according to the set of adjustment gain values G. Compensation; the core spirit of the present invention is to improve the consistency of the display performance of the display by introducing the gray-scale luminance curve value γ _{W in} order to eliminate the error caused by the difference in gray-scale luminance curves between different panels. It is checked that the gray scale brightness curves of different types of displays often have different characteristics (for example, LCD display and CRT display have different gray scale brightness curve calculation formulas), in order to cope with this phenomenon, various technical fields have been developed. Gray-scale brightness curve correction formula, such as the International Telecommunication Union (ITU) for its ITU-R BT.709 standard, also provides a set of gray-scale brightness curve correction different from the above formula (9) Formula, therefore, if the gray-scale luminance curve value γ _{W is} obtained, the set of gain constants C is corrected according to the formula provided by the ITU, and another set of adjustment gain values G′ is obtained , which is also in accordance with the present invention. The spirit should not be removed from the scope of the case that the case is intended to be protected. As can be seen from the above description, as long as the gray-scale luminance curve value γ _{W is used} , the set of gain constants C calculated in the foregoing manner is corrected, that is, in accordance with the core spirit of the present invention, and the set of gain constants C is converted into the group. When the gain value G is adjusted, the calculation formula used for the correction calculation is not limited to this.

In order to more clearly and clearly illustrate the embodiments of the present invention, a preferred embodiment is illustrated to illustrate that when a manufacturer calibrates a display by the method of the present invention, the display can receive input thereto. The present invention is applied to a display 11 having a system circuit board 111, a panel 112, and a memory 113. The system board 111 includes a video decoder (Video Decoder) 111a, a de-interlacer 111b, and a zoom controller 111c. When an image input signal is stored, the input signal is transmitted to the video decoder. In the display 11, the video decoder 111a, the deinterlacing scanner 111b and the scaling controller 111c can sequentially process the input signal so that the input signal can be converted into an output signal, and the scaling controller According to the output signal, the 111c can display an image on the panel 112. In this embodiment, the memory 113 is connected to the zoom controller 111c to enable the zoom controller 11 1c can process the input signal received by the information stored in the memory 113. That is, the manufacturer can measure the panel 112 by using a measuring device 12 to obtain image parameters (such as chromaticity coordinate values, brightness values, or tristimulus values) of the image presented on the panel 112, and measure the same. The obtained parameter is input to an operation unit 13, and the operation unit 13 can be connected to an input device 14 and the memory 113 so that the manufacturer can provide other parameters to the operation unit 13 through the input device 14, and The arithmetic unit 13 can execute the subsequent calculation program according to the image parameters of the screen obtained by the measuring device 12 or other parameters provided by the manufacturer, and write the calculation result to the memory 113.

Referring to FIG. 1 , if the manufacturer wishes to adjust the gray scale white balance of the display 11 , the panel 112 of the display 11 can display a white color temperature of D93, as shown in the CIE 1931 table. In the chromaticity coordinate diagram of the color system, the ( x , y ) chromaticity coordinate value of the white point defined on the D93 isotherm is (0.283, 0.298), so the chromaticity coordinate value (0.283, 0.298) is defined as chromaticity coordinates values over the white W _i one embodiment the preferred embodiment, but the ideal chromaticity coordinates of white W _i is not limited to, other manufacturers may choose as the chromaticity coordinate value over the white W chromaticity coordinates values of _i, for example: using D65 as the target color temperature and the CIE coordinate value of the white point isotherm (0.313, 0.329) as the chromaticity coordinate values of W _i over a white or in in other embodiments, other self-defined chromaticity coordinates chromaticity coordinate values as the value of W _i over white, manufacturers have to change depending on the actual needs of the white chromaticity coordinates of the W _i over the self, the first engagement Chen.

嗣, the three color points on the chromaticity coordinate map are selected as the three primary colors, and the chromaticity coordinate values of the red R _i , the green G _i and the blue B _i are respectively defined, and in the preferred embodiment, The video specification developed by the European Broadcasting Union (EBU) defines the chromaticity coordinates of the red R _i , the green G _{i ,} and the blue B _i as (0.64, 0.33), (0.29, respectively). 0.6) and (0.15, 0.06), however, the chromaticity coordinate values of the red R _i , the green G _i and the blue B _i are not limited to the coordinate values of the three primary colors defined by the known video specifications, and the manufacturer also The chromaticity coordinate values of the three primary colors can be defined by visual requirements.

In the color system defined by CIE, if a brightness parameter Y is imported in addition to the ( x , y ) chromaticity coordinate value, a color having a specific chromaticity coordinate value and a specific brightness value can be defined to the CIE. In the defined color space, the color can be expressed as ( x , y , Y ) according to its chromaticity coordinate value and brightness value. In addition, according to the color system conversion formula formulated by CIE, the chromaticity coordinate of the color can be known. The value and brightness value ( x , y , Y ) can be converted into three stimulus value parameters X , Y and Z according to the following formula (11):

Since the three stimulus value parameters X , Y and Z both contain a factor Y , the formula (11) can be further simplified to the following formula (12):

Therefore, when the manufacturer inputs the aforementioned ideal white W _i , the red R _i , the green G _{i ,} and the blue B _i to the operation unit 13 through the input device 14 , and for the ideal white W _i , the red R _i , the green G _i and the blue B _i respectively give a brightness value Y _wi , Y _ri , Y _gi and Y _bi , and after inputting the brightness values to the operation unit 13 , the operation unit 13 can Calculating the three stimulus values of the ideal white W _i , the red R _i , the green G _i and the blue B _i according to the formula (12), and letting the ideal white W _i , the red R _i , the green G _i and the blue B _i can be expressed by the following formulas (13) to (16), and their luminance values Y _wi , Y _ri , Y _{gi ,} and Y _bi are as follows:

W _i ( X _wi , Y _wi , Z _wi )=(0.9497,1,1.4060)‧ Y _wi ..................(13)

_{R i (X ri, Y ri} , Z ri) = (1.9393,1,0.0909) ‧ Y ri ..................... (14)

_{G i (X gi, Y gi} , Z gi) = (0.4833,1,0.1833) ‧ Y gi .................. (15)

_{B i (X bi, Y bi} , Z bi) = (2.500,1,13.1667) ‧ Y bi .................. (16)

It should be particularly noted that the manner of obtaining the three stimulus values of the ideal white W _i , the red R _i , the green G _{i ,} and the blue B _i is determined by the manufacturer to respectively define the corresponding color point. The chromaticity coordinate value is further given a brightness value, so that the arithmetic unit 13 can obtain the three stimuli values of the color points through the foregoing calculation manner. However, the present invention is not limited thereto, and the manufacturer can also view the needs thereof. The three stimulation values respectively corresponding to the respective color points are directly defined, and the three stimulation values corresponding to the respective color points are respectively input to the operation unit 13 through the input device 14, and the first is clearly indicated. At this point, the manufacturer has defined the picture performance as expected by the aforementioned pre-operation, and in order for the display 11 to present the image performance expected by the manufacturer on the panel 112, the manufacturer must target the display 11 Perform measurement and adjustment.

Referring to FIG. 1 and FIG. 2, in the preferred embodiment, the manufacturer inputs a complex array input signal to the display 11, and the input signals respectively carry white image information with different grayscale values. The display device 11 can display the white image W _n having different gray scale values on the panel 112 according to the input signals. At this time, the manufacturer can measure the screen displayed by the panel 112 by using the measuring device 12 . tristimulus values, in order to make the measuring apparatus 12 can obtain the tristimulus values of each of the white image W _n, respectively, and a plurality of parameters of a plurality of luminance Y _wn white image W _n different gray values, Si, the measuring The device 12 can input the measured values to the operation unit 13 respectively, so that the operation unit 13 can execute the subsequent calculation program according to the tristimulus values of the respective pictures, or calculate the basis according to the brightness parameters Y _wn One of the panels 112 has a grayscale luminance curve value γ _W . According to the conventional techniques in the related art, the calculation method of the grayscale luminance curve value γ _W is not described herein. In the preferred embodiment, the luminance parameter Y _{wn is} obtained. The gray scale luminance curve value γ _W is 2.45.

Before the display 11 has not been calibrated, when the display 11 receives an input signal and the input signal carries the original white image information, the display 11 displays information on the panel 112 according to the information carried by the input signal. screen displays an original image of a white W _p in this case, manufacturers can directly measure the 12 W _p of the original white tristimulus values by the measuring device, in the preferred embodiment, the original energy by white W _p The following formula (17) is expressed by its tristimulus value as follows:

W _p ( X _wp , Y _wp , Z _wp )=(65.1595,69.4793,72.6394).........(17)

According to the preferred embodiment, the manufacturer directly measures the tristimulus value of the image displayed on the panel 112 by using the measuring device 12, but the actual application is not limited thereto. The other measuring parameters (for example, measuring the chromaticity coordinate value and the brightness value of the image image displayed on the panel 112) can be measured by the measuring device 12, and the panel 112 is indirectly obtained through the computing unit 13. The tristimulus value of the image frame.

In order to eliminate the error caused by the difference in the degree of light leakage between the panels, so that the individual displays can be more consistent after the adjustment, in the preferred embodiment, another The input signal is input to the display 11, and the other input signal carries image information having a grayscale value of zero (ie, a full black screen), so that the display 11 can be on the panel 112 according to the other input signal. A background image W _{0 is} displayed, and the manufacturer can measure the panel 112 by the measuring device 12, and obtain a background stimulus value ( X _{w 0} , Y _{w 0} , Z _{w 0} ) of the background image W ₀ . In the preferred embodiment, the background image W ₀ can be expressed by the following set of background stimulus values ( X _{w 0} , Y _{w 0} , Z _{w 0} ) according to the following formula (18):

W ₀ ( X _{w 0} , Y _{w 0} , Z _{w 0} )=(0.1765, 0.1886, 0.2805) ............(18)

The measuring device 12 can input the set of background stimulation values ( X _{w 0} , Y _{w 0} , Z _{w 0} ) to the operation unit 13 so that the operation unit 13 can borrow the group of the background image W ₀ . a background stimulus value ( X _{w 0} , Y _{w 0} , Z _{w 0} ), the three stimulus values of the ideal white W _i , the red R _i , the green G _i , the blue B _{i ,} and the original white W _p Corrected, and then obtained a set of first modified stimulus values a set of second modified stimulus values a set of third modified stimulus values a set of fourth modified stimulus values And a set of fifth corrected stimulus values , as shown in the following formulas (19) to (23):

Referring to Figures 1 and 2, the first modified stimulus value of the group is based on the principle described by Glassman's color matching law. The second corrected stimulus value of the group The third modified stimulus value of the group And the fourth modified stimulus value Mixed according to a first mixing ratio M ₁ , that is, a set of first corrected stimulation values of one unit brightness The second corrected stimulus value of the set of luminances in units of m _ri , the third corrected stimulus value of the set of m _gi unit brightness The fourth modified stimulus value with m _bi unit brightness Mixed; similarly, the fifth modified stimulus value of the group The second corrected stimulus value of the group The third modified stimulus value of the group And the fourth modified stimulus value Mixed according to a second mixing ratio M ₂ , that is, the set of fifth corrected stimulation values of one unit brightness The second corrected stimulus value of the set of brightness by m _rp unit , the third corrected stimulus value of the set of m _gp unit brightness The fourth modified stimulus value with m _bp unit brightness Mixed, as shown in the following formulas (24) and (25):

Substituting the above formulas (1) to (5) into the equations (24) and (25), the following equations (26) and (27) can be obtained:

For the convenience of calculation, the above formulas (26) and (27) are further organized into the following formulas (28) and (29):

Since the values of Y _wi , Y _ri , Y _gi and Y _bi often exceed 100, and ( X _{w 0} , Y _{w 0} , Z _{w 0} ), ( m _ri , m _gi , m _bi ) and ( m _rp , m _Gp , m _bp ) are the values of the decimal point. Therefore, by substituting the values of equations (19)-(23) into equations (28) and (29), the obtained equation can be simplified and solved simultaneously. The results shown in the following formulas (30) and (31) can be obtained:

Si, such that the display 11 upon receiving the input signal, to convert the input signal into an output signal for enabling the display can according to the output signal, presented in line with the image screen of the over white W _i of on the panel , not according to the input signal, is directly presented on the panel screen of the line with the image of the original white W _p, therefore, must be mixed by the ratio M ₁ of the first and second mixing ratio of M _2, to obtain the The input signal is converted into a set of gain constants C required for the output signal. It is known that the set of gain constants C corresponds to the ratio of the first mixing ratio M ₁ and the second mixing ratio M ₂ . Therefore, by dividing the formula (30) by the formula (31), the following formula (32) can be obtained. Show results:

嗣, substituting the formula (32) into the formula (8), the set of gain constants C can be expressed by the following formula (33):

C ( c _r , c _g , c _b )=(0.0124,0.0144,0.0202)‧ Y _wi ............(33)

In the preferred embodiment, in order to facilitate subsequent calculations, the arithmetic unit 13 normalizes the set of gain constants C according to the following formula (34) to make the parameters of the set of gain constants C' after normalization. The maximum value in is 1:

In the preferred embodiment, after the values of the formula (33) are substituted into the formula (34), the value of the set of gain constants C' obtained after normalization is (0.6139, 0.7129, 1).嗣, in order to eliminate the error caused by the difference of the gray-scale brightness curves between the panels, so that the individual monitors can be more correct and consistent after being calibrated. The arithmetic unit 13 corrects the normalized set of gain constants C′ by the gray scale luminance curve value γ _W , and further, in the preferred embodiment, the digital circuit of the display 11 can be calculated according to the calculation. As a result, the input signal received by the display 11 is gain-compensated. Therefore, the obtained value is amplified by a power of 2, and the rounding method is used to take the nearest integer value as one. The group adjusts the gain value G , but the magnification is not limited to the power of 2, which is first and foremost. In the preferred embodiment, the obtained value is amplified by 2 ⁷ = 128 times, and the respective adjustment gain values G _r , G _g and G _{b are respectively obtained} as shown in the following formula (35):

After substituting the numerical values, the integer value system (105, 112, 128) is closest to the calculation result. Therefore, (105, 112, 128) is taken as each adjustment gain value of the set of adjustment gain values G , respectively, and the operation unit 13 The set of adjustment gain values G can be written into the memory 113 to enable the scaling controller 111c to subsequently input to the display 11 according to the set of adjustment gain values G stored in the memory 113. The input signal is subjected to gain compensation so that the input signals can be converted into output signals, and the display 11 can display the best color performance on the panel 112 according to the output signals.

It should be particularly noted that the above-mentioned steps of normalizing the value and amplifying the power of 2 are mainly for facilitating the digital circuit to perform subsequent signal processing according to the values, and therefore, it is not limited to The value of the group gain constant C is normalized. When the actual application is performed, the set of gain constants C that are not normalized can be directly corrected by the gray-scale luminance curve value γ _W , and the set of adjustment gain values G is obtained .嗣, the set of adjustment gain value G is normalized, and equivalent effects can be received. Therefore, all equivalent changes based on the spirit of the present invention should be in accordance with the scope of the patent application of the present invention. In the foregoing preferred embodiment, the memory 113 is directly disposed on the circuit board 111 of the system. However, the present invention is not limited thereto, and the manufacturer is in accordance with the concept of the present invention. When the system board 111 and the panel 112 are manufactured, the memory 113 may be built in the zoom controller 111c, or the memory 113 may be disposed in the panel 112. Further, the manufacturer also According to the International Color Association (I The format of the ICC profile defined by the National Color Consortium (ICC), the set of adjustment gain values G is written into a color description file, and the color description file is provided to an electronic device (pattern) When the electronic device is connected to the display 11, the electronic device can correct the image signal sent to the display 11 according to the content of the color description file, so that the preferred implementation of the present invention can also be achieved. </ RTI><RTIgt;</RTI><RTIgt;</RTI><RTIgt;</RTI><RTIgt;</RTI></RTI><RTIgt; Chen Ming.

In summary, for the purpose of reviewing the technical outline of the present invention, a flowchart will be taken to illustrate the main implementation steps of the present invention, as shown in Figure 3:

(201) respectively setting the chromaticity coordinate values and the brightness values of the ideal white, red, green, and blue colors, and respectively converting them into tristimulus values;

(202) displaying an all-white image of different grayscale values on the panel to obtain a plurality of luminance parameters of a white image of a primary white, a set of background stimulus values, and a plurality of white images of different grayscale values;

(203) deducting the set of background stimulus values from the three values of the ideal white, the red, the green, the blue, and the original white, respectively, to obtain a set of first modified stimulus values and a set of second modified stimulus respectively. a value, a set of third modified stimulus values, a set of fourth corrected stimulus values, and a set of fifth corrected stimulus values;

(204) determining, according to Glassman's color matching law, a combination of the second modified stimulation value of the group, the third modified stimulation value of the group, and the fourth modified stimulation value of the group are mixed into the first modified stimulation value of the group. a mixing ratio, and a second mixing ratio required by the group of the second modified stimulation value, the set of the third modified stimulation value, and the set of the fourth modified stimulation value to be mixed into the set of fifth modified stimulation values;

(205) determining a set of gain constants according to the first mixing ratio and the second mixing ratio;

(206) determining, by the plurality of brightness parameters, a grayscale brightness curve value of the panel; and

(207) correcting the set of gain constants by the grayscale luminance curve value, and obtaining a set of calibration gain values.

In particular, the "three stimulus values of ideal white W _i , red R _i , green G _i and blue B _i respectively set" in step (201) indicate that the manufacturer can directly designate respectively corresponding to The three stimuli values of the color points, or the chromaticity coordinate values corresponding to the color points, respectively, and a brightness value is respectively given for the color points to define the chromaticity coordinates of the color points and The brightness value is set to correspond to the three stimulation values of the color points, and when actually applied, it can be changed according to the technology well known in the field, and the first is clear. According to the technical feature of the present invention, the display can automatically adjust the color performance of the panel 112 according to the set of adjustment gain values G. Because the method of the present invention calculates the set of adjustment gain values G , Considering the gray-scale brightness curve value γ _{W of} the panel 112 and the light leakage factor of the gray-scale value of zero (the background image W ₀ ), the problem of time and labor cost of the conventional manual adjustment can be improved, and the manufacturer is greatly improved. The work efficiency when adjusting the panel of the display can better balance the difference in the performance characteristics of the screens between different display panels, so that the screen performance of the adjusted panel can have higher correctness and consistency, and is effective. Improve many problems in the way of adjusting the knowledge.

In addition, in the foregoing embodiment, the ideal white W _i , the red R _i , the green G _i , the blue B _{i ,} and the original are first obtained before calculating the first color mixing ratio and the second color mixing ratio. The white W _p stimuli value is deducted from the set of background stimuli values ( X _{w 0} , Y _{w 0} , Z _{w 0} ), respectively, but in other embodiments of the invention, the set of background stimuli values may not be deducted ( X _{w 0} , Y _{w 0} , Z _{w 0} ), and directly calculating the first mixing ratio M ₁ and the second mixing ratio M ₂ , the main reason is that the current light leakage level of the display is controlled by the industry to a standard range In order to reduce its influence on the display image of the panel, the method of the present invention can omit the aforementioned step (203), so that the present invention can be applied to products of different needs.

According to the above description, it is only a preferred embodiment of the present invention. However, the technical features of the present invention are not limited thereto, and any person skilled in the art can easily think about it in the related technical field of the present invention. Changes or modifications are to be covered in the scope of the patents in this case below.

11. . . monitor

111. . . System board

111a. . . Video decoder

111b. . . Deinterlacing scanner

111c. . . Zoom controller

112. . . panel

113. . . Memory

12. . . Measuring device

13. . . Arithmetic unit

14. . . Input device

1 is a reference diagram of a hardware architecture embodying the present invention;

2 is a schematic flow chart showing the calculation of the set of adjustment gain values of the present invention; and

Figure 3 is a flow chart showing the main implementation steps of the present invention.

Claims (8)

A method for introducing a white brightness parameter of a display panel into a gray scale white balance gain value according to a white optical characteristic of the display panel to improve the gray scale white balance adjustment accuracy, the method is applied to a display, and includes the following steps: Set a chromaticity coordinate value and a brightness value of an ideal white, a red, a green, and a blue color, respectively, and convert them into tristimulus values; display a plurality of image images of different grayscale values on the panel, and The measuring device measures the panel to obtain a set of background stimulus values of a primary white tristimulus value, a grayscale value of one of the background images, and a plurality of different grayscale values respectively displayed on the panel. a plurality of brightness parameters of the white image; the three values of the ideal white, the red, the green, the blue, and the original white are respectively subtracted from the set of background stimulus values to obtain a set of first corrected stimulus values, a set of second modified stimulus values, a set of third modified stimulus values, a set of fourth modified stimulus values, and a set of fifth modified stimulus values; according to Glassman's color matching law, And a first mixing ratio required for the second modified stimulation value, the third modified stimulation value, and the fourth modified stimulation value of the group to be mixed into the first modified stimulation value of the group; according to Grassmann's color matching law, Determining, according to the first mixing ratio, a second mixing ratio required for the second modified stimulation value, the third modified stimulation value, and the fourth modified stimulation value of the group to be mixed into the fifth modified stimulation value of the group; And determining, by the second mixing ratio, a set of gain constants; and determining, by the plurality of brightness parameters, a grayscale brightness curve value of the panel, and correcting the set of gain constants by using the grayscale brightness curve value to obtain A set of tuning gain values. According to the method of claim 1, the stimulating value of the ideal white, the red, the green, and the blue is respectively set according to the following steps: the chromaticity coordinate value of the white point of the selected target color temperature is the ideal white color. Coordinate value; the chromaticity coordinate values of the three color points on the selected chromaticity coordinate map are respectively used as the chromaticity coordinate values of the red, the green and the blue; respectively, a brightness value is given for the color points; And according to the color scheme conversion formula formulated by the International Lighting Association, the three white stimulus values of the ideal white, the red, the green and the blue are respectively obtained. The method of claim 2, wherein the gain constants of the primary colors of the set of gain constants are respectively taken to be the inverse of the grayscale luminance curve values, and the sets of gain constants are corrected by the grayscale luminance curve values. The gain constant of the primary color. The method according to claim 3, wherein the set of gain constants is normalized, and the set of gain constants is corrected by the grayscale luminance curve value. The method according to claim 3, wherein the set of gain constants is first corrected by the grayscale brightness curve value, and the set of adjusted gain values is obtained, and the set of adjusted gain values is normalized. The method of claim 4 or 5, further comprising: amplifying the set of adjustment gain values, and taking the closest one of the set of integers as the adjustment gain value of each primary color of the set of adjustment gain values. The method of claim 6, further comprising: writing the set of adjustment gain values into a memory of the display, so that the display can input the subsequent input to the display according to the set of adjustment gain values. The signal is gain compensated. The method of claim 6, further comprising: writing the set of adjustment gain values into a color description file, and providing the color description file to an electronic device to connect the electronic device to the display The electronic device can correct the image signal sent to the display according to the content of the color profile.