JP2005017520A - El color display device - Google Patents

El color display device Download PDF

Info

Publication number
JP2005017520A
JP2005017520A JP2003179915A JP2003179915A JP2005017520A JP 2005017520 A JP2005017520 A JP 2005017520A JP 2003179915 A JP2003179915 A JP 2003179915A JP 2003179915 A JP2003179915 A JP 2003179915A JP 2005017520 A JP2005017520 A JP 2005017520A
Authority
JP
Japan
Prior art keywords
color
video signal
deterioration
luminance
panel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2003179915A
Other languages
Japanese (ja)
Inventor
Kunihiko Sakota
Hiroaki Shimazaki
Kenjiro Tsuda
浩昭 島崎
賢治郎 津田
邦彦 迫田
Original Assignee
Matsushita Electric Ind Co Ltd
松下電器産業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Ind Co Ltd, 松下電器産業株式会社 filed Critical Matsushita Electric Ind Co Ltd
Priority to JP2003179915A priority Critical patent/JP2005017520A/en
Publication of JP2005017520A publication Critical patent/JP2005017520A/en
Pending legal-status Critical Current

Links

Images

Abstract

<P>PROBLEM TO BE SOLVED: To provide an EL color display correcting device which performs temporal deterioration correction wherein influences of variance in temporal deterioration quantity among EL color display solid bodies and use conditions such as ambient temperature are taken into consideration. <P>SOLUTION: This EL color display correcting device has a color correcting means which inputs a video signal, makes color corrections according to color correction parameters, and outputs the corrected video signal, a color EL panel which inputs the corrected video signal and makes subpixels of R, G, and B illuminate to make a color display, a luminance sensor which measures the luminance of the display image on the color EL panel and outputs a luminance measurement value, a deterioration information generating means which previously stores deterioration characteristics of subpixels of R, G, and B of the color EL panel, derives deterioration information showing how much the subpixels of R, G, and B of the color EL panel from the luminance measurement value and deterioration characteristics, and outputs the information, and a color correction parameter calculating means which calculates the color correction parameters from the deterioration information and outputs them. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an EL color display device.
[0002]
[Prior art]
In recent years, attention has been paid to organic EL color displays using organic electroluminescence elements (hereinafter referred to as “organic EL elements”) as light emitting materials as thin high-definition color displays. Compared with LCD (Liquid Crystal Display), which is currently the mainstay thin color display, the organic EL color display is self-luminous, so it has high brightness, wide field of view, high contrast and low backlight. Further reduction in thickness is possible with power consumption.
[0003]
As colorization methods for color displays using organic EL elements, methods such as a three-color juxtaposition method, a white method, and a color conversion method have been proposed. Of these, the three-color juxtaposition method is the most common. The three-color juxtaposed EL color display device has a plurality of pixels (pixels), and each pixel is composed of light-emitting elements (sub-pixels) of RGB (red, green, and blue) colors.
However, the luminance of the organic EL element decreases as the light emission time elapses. At present, the organic EL element is greatly deteriorated over time as compared with other display devices such as a CRT, which is a big problem in putting an EL color display into practical use. Furthermore, a color display using organic EL elements uses light emitting elements made of different light emitting materials for each of RGB sub-pixels, and their deterioration characteristics are different.
[0004]
As an example, FIG. 8 shows luminance deterioration characteristics over time of RGB organic EL elements. The luminance in the initial state of each of the RGB light emitting elements was normalized by 1, and the decrease in the luminance when the EL element continued to emit light at a constant voltage was graphed. In FIG. 8, the vertical axis represents the luminance of each light emitting element, and the horizontal axis represents time. In the case of this example, the red light emitting element is particularly deteriorated.
For this reason, a color display using an organic EL element has a problem that a decrease in luminance and a change in color balance (color shift) occur with time.
[0005]
Patent Document 1 discloses a conventional display device (for example, an EL color display device) in which this problem has been improved. The display device of the conventional example stores the aging deterioration characteristics of each RGB in advance, and estimates the aging deterioration amount from the lighting times (display rate time integrated values) of the respective RGB. For example, it is assumed that the blue light emitting element is most severely deteriorated, followed by red and green. The display device of the conventional example suppresses the red and green gamma characteristics with small luminance degradation according to the amount of aging degradation while maintaining the blue gamma characteristic with large luminance degradation as the initial setting (maximum luminance is reduced). (Correct) direction. This ensures that the white balance is maintained correctly even when aging occurs.
[0006]
[Patent Document 1]
JP 2002-6796 A
[0007]
[Problems to be solved by the invention]
However, the conventional EL color display device has the following problems. First, the degree of variation in aging deterioration between individual EL color displays and the use conditions such as ambient temperature affect aging deterioration are not taken into consideration. Secondly, since white balance adjustment is used to adjust the luminance balance of each color of RGB, it is necessary to perform adjustment according to the color with the greatest amount of aging deterioration and the lowest luminance of RGB. The image after aging correction is not colorful.
[0008]
In view of the above problems, the present invention is an EL color display capable of accurately performing aging deterioration correction with consideration of variations in the amount of aging deterioration between individual EL color displays and the influence of use conditions such as ambient temperature with an inexpensive configuration. An object is to provide an apparatus.
Furthermore, the present invention does not need to be adjusted according to the color having the largest amount of aging deterioration among RGB and having the lowest luminance, and can display an image after aging deterioration correction more vividly. An object is to provide a color display device.
[0009]
[Means for solving problems]
In order to solve the above problems, the present invention has the following configuration. According to the first aspect of the present invention, an R video signal, a G video signal, and a B video signal are input, color correction is performed on these video signals based on color correction parameters, and the corrected R video signal and the corrected G video signal are corrected. And color correction means for outputting as a corrected B video signal, color electroluminescence (color EL) for inputting the corrected R video signal, the corrected G video signal and the corrected B video signal and emitting RGB sub-pixels for color display. ) A panel, a luminance sensor for measuring the luminance in the display image of the color EL panel, and outputting a luminance measurement value; preliminarily storing degradation characteristics of RGB sub-pixels of the color EL panel; and the luminance measurement value; R degradation information, G degradation information, and B degradation information indicating the degree of degradation of the RGB sub-pixels of the color EL panel are derived from the degradation characteristics. Deterioration information generation means for calculating color correction parameters from the R deterioration information, G deterioration information and B deterioration information, and outputting the color correction parameters to the color correction means. This is an EL color display device.
[0010]
According to a second aspect of the present invention, the R video signal, the G video signal, and the B video signal are input, the video signal is detected to have a predetermined value, and the detection signal is output. And the deterioration information generating means receives the detection signal and determines the R deterioration from the luminance measurement value when the R video signal, the G video signal and the B video signal are the predetermined values. 2. The EL color display device according to claim 1, wherein the information, G deterioration information, and B deterioration information are derived and output.
[0011]
According to a third aspect of the present invention, the deterioration information generating means includes RGB of the color EL panel based on the luminance measurement value, the input R video signal, G video signal and B video signal, and deterioration characteristics. 2. The EL color display device according to claim 1, wherein R deterioration information, G deterioration information and B deterioration information indicating the degree of deterioration of the sub-pixel are derived and output.
[0012]
According to a fourth aspect of the present invention, an R video signal, a G video signal, and a B video signal are input, color correction is performed on these video signals based on color correction parameters, and the corrected R video signal and the corrected G video signal are corrected. And a color correction means for outputting as a corrected B video signal, a color EL panel for inputting the corrected R video signal, the corrected G video signal, and the corrected B video signal and emitting RGB sub-pixels to perform color display; and A luminance sensor that measures luminance in a display image of a color EL panel and outputs a luminance measurement value; and three or more sets of the R video signal, G video signal, and B video signal having different ratios between the input video signals; Degradation information that derives and outputs R degradation information, G degradation information, and B degradation information indicating the degree of degradation of RGB sub-pixels of the color EL panel based on the luminance measurement values of each set An EL color display comprising: a generating unit; and a color correction parameter calculating unit that calculates the color correction parameter from the R deterioration information, the G deterioration information, and the B deterioration information and outputs the color correction parameter to the color correction unit Device.
[0013]
INDUSTRIAL APPLICABILITY The present invention can realize an EL color display device capable of accurately performing aging deterioration correction with consideration of variations in aging deterioration amount among individual EL color displays and the influence of usage conditions such as ambient temperature with an inexpensive configuration. It has the action.
[0014]
According to a fifth aspect of the present invention, in the EL color display device according to any one of the first to fourth aspects, the color correction unit performs a color conversion process by a matrix operation. .
The present invention eliminates the need for adjustment according to the color having the largest amount of aging deterioration among RGB and the lowest luminance, and can display an image after aging deterioration correction more vividly. The display device can be realized.
[0015]
According to a sixth aspect of the present invention, the color EL panel includes an additional EL element outside the effective screen, and the luminance sensor measures the luminance of the additional EL element. An EL color display device according to claim 5.
[0016]
According to a seventh aspect of the present invention, the luminance sensor is disposed on a side surface of the color EL panel, and measures the luminance of light leaking laterally from the color EL panel. An EL color display device according to any one of the claims.
[0017]
The invention according to claim 8 is the EL color display according to claim 6 or 7, wherein the luminance sensor is integrated with the color EL panel. Device.
The present invention is a low-cost configuration that does not use a separate measuring device, and can compensate for aging deterioration in consideration of variations in the amount of aging deterioration between individual EL color display devices and the influence of use conditions such as ambient temperature, without using an EL color display device alone. It is possible to realize an EL color display device that can be performed accurately in the above manner.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, EL color display devices according to embodiments of the present invention will be described with reference to the drawings.
[0019]
Embodiment 1
The EL color display device according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram showing a configuration of an EL color display device according to Embodiment 1 of the present invention.
In FIG. 1, 101 is a color EL panel, 102 is color correction means, 103 is input level detection means, 104 is a luminance sensor, 105 is deterioration amount estimation means, 106 is color correction parameter calculation means, and 111 is an R video signal input terminal. , 112 are G video signal input terminals, and 113 is a B video signal input terminal. The color EL panel 101 is a color display panel using organic EL elements.
[0020]
The operation of the organic EL color display device configured as described above will be described.
The organic EL color display of the present embodiment inputs RGB color video signals (all digital signals). R video signal (R 1 ) Is input to the R video signal input terminal 111. G video signal (G 1 ) Is input to the G video signal input terminal 112. B video signal (B 1 ) Is input to the B video signal input terminal 113. The color correction unit 102 outputs an R video signal (R 1 ), G video signal (G 1 ), B video signal (B 1 ) Is subjected to linear color correction (color conversion processing by matrix calculation) based on the color correction parameters represented by the components of the 3 × 3 square matrix, and the color correction R video signal (R 2 ), Color correction G video signal (G 2 ), Color correction B video signal (B 2 ) Is output (details will be described later).
[0021]
The color correction unit 102 performs color correction to improve the color reproducibility of the color EL panel 101. The color correction unit 102 receives the input R video signal (R 1 ), G video signal (G 1 ), B video signal (B 1 ) And the color reproduction area of the color EL panel 101 (color reproduction area depending on the display device) are corrected. Further, the color correcting unit 102 corrects the color reproducibility that has been lowered due to the aging deterioration of the light emitting materials of the respective RGB colors. By this color correction, a decrease in color reproducibility due to aged deterioration of the light emitting materials for each of RGB is suppressed.
The color EL panel 101 includes a color correction R video signal (R 2 ), Color correction G video signal (G 2 ), Color correction B video signal (B 2 ) To display an image.
[0022]
Also, the input R video signal (R 1 ), G video signal (G 1 ), B video signal (B 1 ) Is separately added to the input level detecting means 103. The input level detection means 103 detects when the RGB video signal levels are maximized in most areas of the screen, and outputs a detection signal to the degradation amount estimation means 105. For example, when the RGB video signals are 8-bit digital signals, when the R video signal = 255, the G video signal = 255, and the B video signal = 255, the deterioration amount estimation means 105 outputs a detection signal.
[0023]
A luminance sensor 104 is installed at a position in front of the center of the color EL panel 101 at a certain distance. The luminance sensor 104 measures the luminance of the image displayed on the color EL panel 101. The luminance sensor 104 outputs the luminance measurement value to the deterioration amount estimation unit 105.
[0024]
When the detection signal is input from the input level detection unit 103 (when the level of the video signal is maximized), the deterioration amount estimation unit 105 samples the luminance measurement value input from the luminance sensor 104 and inputs the maximum level. Is determined. The deterioration amount estimation means 105 stores in advance the deterioration characteristics (FIG. 2) of the respective RGB light emitting elements with respect to the luminance when the maximum level is input.
[0025]
FIG. 2 is a diagram showing the deterioration characteristics of the light emitting elements of RGB with respect to the luminance at the time of inputting the maximum level of the EL color display. In FIG. 2, the x-axis indicates the luminance when the maximum level is input, and the y-axis indicates the degradation amount (the initial value is 0, and the degradation amount increases as the degradation progresses. For example, the luminance level of the light emitting element is 30 % Decrease, the deterioration amount is 0.3). In the xy coordinates of FIG. 2, each point having the same x-coordinate value in the RGB deterioration characteristic curve indicates the amount of deterioration when each RGB light-emitting element is input for the maximum level and is lit for the same time. X 0 Is the luminance when the maximum level is input in the initial state. Each RGB light emitting element has a different deterioration characteristic. For example, the RGB degradation amount (the degradation amount at the intersection of the x = X line and each degradation characteristic curve of RGB) at the time when the luminance when the maximum level is input is X is Y R , Y G , Y B It is.
[0026]
The deterioration amount estimation means 105 calculates the deterioration amount (Y of the light emitting element of R based on FIG. R ), Degradation amount of light emitting element of G (Y G ), The deterioration amount of the light emitting element of B (Y B ). The degradation amount estimation means 105 is a degradation amount estimation value (Y R , Y G , Y B ) Is output to the color correction parameter calculation means 106.
The color correction parameter calculation means 106 calculates a color correction parameter from the respective RGB deterioration amount estimation values (details will be described later). The color correction parameter calculation unit 106 outputs the color correction parameter to the color correction unit 102.
[0027]
A linear color correction method of the color correction unit 102 will be described. FIG. 3 is a block diagram showing the configuration of the color correction means of the EL color display device according to Embodiment 1 of the present invention. In the following description, it is assumed that an 8-bit digital RGB signal is input as a color video signal. R video signal (R 1 ) Is input to the R video signal input terminal 301. G video signal (G 1 ) Is input to the G video signal input terminal 302. B video signal (B 1 ) Is input to the B video signal input terminal 303. At this time, the color correction R video signal (R 2 ) Is output from the R video signal output terminal 304. Color correction G video signal (G 2 ) Is output from the G video signal output terminal 305. Color correction B video signal (B 2 ) Is output from the B video signal output terminal 306. In the color conversion circuit shown in FIG. 3, the matrix operation shown in Expression 1 is executed.
[0028]
[Expression 1]
[0029]
Conversion coefficients A11, A12, A13, A21, A22, A23, A31, A32, and A33 are input to conversion coefficient input terminals 311, 312, 313, 314, 315, 316, 317, 318 and 319, respectively. The multiplier 321 receives an R video signal (R 1 ) And the conversion coefficient A11 from the conversion coefficient input terminal 311 and the multiplication result (A11 × R 1 ) Is output to the adder 331. The multiplier 322 receives a G video signal from the G video signal input terminal 302 (G 1 ) And the conversion coefficient A12 from the conversion coefficient input terminal 312 and the multiplication result (A12 × G 1 ) Is output to the adder 331. The adder 331 adds the multiplication results from the multiplier 321 and the multiplier 322, and adds the result (A11 × R 1 + A12 × G 1 ) Is output to the adder 332.
[0030]
The multiplier 323 receives the B video signal from the B video signal input terminal 303 (B 1 ) And the conversion coefficient A13 from the conversion coefficient input terminal 313, and the multiplication result (A13 × B 1 ) Is output to the adder 332. The adder 332 adds the addition result of the adder 331 and the multiplication result from the multiplier 323, and adds the result (A11 × R 1 + A12 × G 1 + A13 × B 1 ) To the clip means 341. The clip unit 341 clips the addition result so as to be within an 8-bit width, and the addition result (color correction R video signal (R 2 = A11 × R 1 + A12 × G 1 + A13 × B 1 )) Is output to the R video signal output terminal 304.
[0031]
The signal conversion process is performed in the same manner for other cases. The G video signal output terminal 305 outputs a processing result (color correction G video signal (G 2 = A21 x R 1 + A22 × G 1 + A23 × B 1 )) Is output. The B video signal output terminal 306 outputs a processing result (color correction B video signal (B 2 = A31 x R 1 + A32 × G 1 + A33 × B 1 )) Is output. The values of the conversion coefficients A11 to A33 are determined by the color correction parameter calculation means 106.
[0032]
A parameter calculation method of the color correction parameter calculation unit 106 will be described. FIG. 4 is a CIExy chromaticity diagram. FIG. 4 is often used as a method for expressing a color reproduction region of a monitor or the like. All the colors that humans can perceive are shown in the area inside the horseshoe 401 on this CIExy chromaticity diagram. The center of the horseshoe is achromatic.
The color reproduction area after a certain period of use (after aged deterioration) is an area inside the triangle formed by the R chromaticity point 402, the G chromaticity point 403, and the B chromaticity point 404. The color reproduction region assumed in the input RGB video signal (generally a value determined by an image signal standard such as NTSC) is a triangle formed by an R chromaticity point 405, a G chromaticity point 406, and a B chromaticity point 407. This is the inner area.
[0033]
When the input RGB image signal is input to the display unit as it is, the color reproduction region indicated by the triangle formed by the R chromaticity point 402, the G chromaticity point 403, and the B chromaticity point 404 is actually displayed (after aging degradation). Is displayed with reference to. Only a color region narrower than the color reproduction region assumed by the input RGB video signal (region inside the triangle formed by the R chromaticity point 405, the G chromaticity point 406, and the B chromaticity point 407) can be reproduced. An image that is not vivid is displayed.
[0034]
In the first embodiment, as indicated by an arrow in FIG. 4, the conversion coefficient is determined so as to map the color reproduction region of the display unit to the color reproduction region assumed by the input RGB image signal. That is, the color reproduction is performed so that the R chromaticity point 402 and the G chromaticity point 405, 403 and 406, and the B chromaticity point 404 and 407, respectively, are artificially matched. Perform processing to expand the area.
In this case, for a signal having chromaticity close to the center of the triangle, that is, a signal with low original saturation, a display unit having the same color reproduction area as the color reproduction area assumed by the input RGB image signal is used. It is possible to display a colorful image equivalent to the display. However, since the color reproduction region of the display unit itself has not expanded, a signal having chromaticity close to the outside of the triangle, that is, a signal with high saturation, is limited by the color reproduction region of the display unit (xy color). (The color outside the color reproduction area of the display unit cannot be expressed on the degree map.) The triangles indicated by the R chromaticity point 402, the G chromaticity point 403, and the B chromaticity point 404 are displayed in such a manner that the image color is saturated. However, instead of correcting by reducing the brightness of other colors according to the color with the highest degree of deterioration, an operation to expand the entire color reproduction area is performed, so a colorful image is presented as the corrected image Can do.
[0035]
The input / output signal is an RGB signal in Equation 1, but is shown on the CIExy chromaticity diagram in FIG. The chromaticity of a certain color on the color reproduction region of the display section after aging (region inside the triangle formed by the R chromaticity point 402, the G chromaticity point 403, and the B chromaticity point 404) is expressed as x. 1 , Y 1 , Z 1 XYZ tristimulus value X 1 , Y 1 , Z 1 Is represented by Equation 2.
[0036]
[Expression 2]
[0037]
However, S 1 = X 1 + Y 1 + Z 1 It is. The chromaticity of the corresponding color on the color reproduction region (region inside the triangle formed by the R chromaticity point 405, the G chromaticity point 406, and the B chromaticity point 407) assumed by the input RGB image signal is expressed as x. 2 , Y 2 , Z 2 XYZ tristimulus value X 2 , Y 2 , Z 2 Is represented by Equation 3.
[0038]
[Equation 3]
[0039]
However, S 2 = X 2 + Y 2 + Z 2 It is.
Also, the conversion from the XYZ tristimulus values to the RGB tristimulus values is expressed by Equation 4.
[0040]
[Expression 4]
[0041]
RGB when the input signal is displayed as it is on the color reproduction area of the display unit as it is aged (the area inside the triangle formed by the R chromaticity point 402, G chromaticity point 403, and B chromaticity point 404) R and xy chromaticity of each chromaticity point 1 (Rx 1 , Ry 1 , Rz 1 ), G 1 (Gx 1 , Gy 1 , Gz 1 ), B 1 (Bx 1 , By 1 , Bz 1 ). This is the xy chromaticity R of each RGB chromaticity point in the color reproduction region assumed by the input RGB image signal. 2 (Rx 2 , Ry 2 , Rz 2 ), G 2 (Gx 2 , Gy 2 , Gz 2 ), B 2 (Bx 2 , By 2 , Bz 2 ) To obtain the conversion coefficient to match. From Expressions 1 to 4, Expression 5 is established.
[0042]
[Equation 5]
[0043]
As described above, in the first embodiment, by measuring the aging deterioration amount of the luminance level using the luminance sensor, estimating the aging deterioration amount of each color from the result, and correcting the color shift, It is possible to accurately correct the aging deterioration amount without being affected by variations in the aging deterioration amount among the individual EL color displays and the use conditions such as the ambient temperature.
[0044]
<< Embodiment 2 >>
An EL color display device according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram showing a configuration of an EL color display apparatus according to Embodiment 2 of the present invention. The configuration of the EL color display device according to the second embodiment of the present invention (FIG. 1) is the same as that of the first embodiment, and thus the description thereof is omitted.
[0045]
The operation of the organic EL color display device according to the second embodiment will be described.
The organic EL color display of the present embodiment inputs RGB color video signals (all digital signals). The R video signal is input to the R video signal input terminal 111. The G video signal is input to the G video signal input terminal 112. The B video signal is input to the B video signal input terminal 113. The color correction unit 102 performs linear color correction on the R video signal, the G video signal, and the B video signal based on the color correction parameter represented by each component of the 3 × 3 square matrix, and the color corrected R video A signal, a color correction G video signal, and a color correction B video signal are output.
[0046]
The color correction unit 102 performs color correction to improve the color reproducibility of the color EL panel 101. The color correction unit 102 corrects the difference between the color reproduction area of the input R video signal, G video signal, and B video signal and the color reproduction area (color reproduction area depending on the display device) of the color EL panel 101. Further, the color correcting unit 102 corrects the color reproducibility that has been lowered due to the aging deterioration of the light emitting materials of the respective RGB colors. By this color correction, a decrease in color reproducibility due to aged deterioration of the light emitting materials for each of RGB is suppressed.
The color EL panel 101 displays an image based on the color-corrected R video signal, color-corrected G video signal, and color-corrected B video signal that have been color-corrected by the color correcting unit 102.
[0047]
The input R video signal, G video signal, and B video signal are separately added to the input level detecting means 103. The input level detection unit 103 detects when the RGB video signal levels are equal to or higher than a certain value in most areas of the screen, and outputs a detection signal to the degradation amount estimation unit 105.
[0048]
A luminance sensor 104 is installed at a position in front of the center of the color EL panel 101 at a certain distance. The luminance sensor 104 measures the luminance of the image displayed on the color EL panel 101. The luminance sensor 104 outputs the luminance measurement value to the deterioration amount estimation unit 105.
When the detection signal is input from the input level detection unit 103 (when the video signal level becomes a certain value or more), the deterioration amount estimation unit 105 samples the luminance measurement value input from the luminance sensor 104 to obtain the luminance (X ) If the R video signal input at the time of measurement is R, the G video signal is G, and the B video signal is B, the luminance (X 3 ) Is expressed by, for example, a linear linear expression (6). The degradation amount estimation means 105 is configured to input the RGB video signal level and luminance (X 3 ) Is stored. Each coefficient abc in Equation 6 represents the brightness (X in three video input signals having different RGB ratios. 3 ) And substituting the measured value into Equation 6 can be obtained. When all of the input video signals RGB at the time of measurement have a certain level or more in at least one measurement, measurement is performed to obtain each coefficient abc of Equation 6. The deterioration amount estimation unit 105 stores Equation 6.
[0049]
[Formula 6]
[0050]
The deterioration amount estimating means 105 obtains the deterioration characteristics (FIG. 2) of the respective RGB light emitting elements with respect to the luminance in advance. X 0 Is the luminance when the maximum level is input in the initial state. Each RGB light emitting element has a different deterioration characteristic.
[0051]
After the color EL panel 101 has deteriorated over time, the same measurement as described above is performed. The input level detection unit 103 detects when the RGB video signal levels are equal to or higher than a certain value in most areas of the screen, and outputs a detection signal to the degradation amount estimation unit 105. When the detection signal is input from the input level detection unit 103 (when the video signal level becomes a certain value or more), the deterioration amount estimation unit 105 samples the luminance measurement value input from the luminance sensor 104 to obtain the luminance (X 4 ) The degradation amount estimation means 105 is configured to input the RGB video signal level and luminance (X 4 ) Is stored.
[0052]
The degradation amount estimation means 105 is a luminance (X 4 ) And the level of the input video signal RGB at that time, the deterioration characteristic of FIG. R ), Degradation amount of light emitting element of G (Y G ), The deterioration amount of the light emitting element of B (Y B ).
First, assume that the current degree of degradation is x = X in FIG. RGB degradation amounts Y at x = X R , Y G , Y B And the coefficient abc of Expression 6 are used to correct the correction coefficient a after deterioration according to Expression 7. 2 , B 2 , C 2 Is calculated.
[0053]
[Expression 7]
[0054]
By substituting the corrected coefficient and the level of the input video signal RGB in the measurement after aging deterioration into Expression 6, Expression 8 is established.
[0055]
[Equation 8]
[0056]
The calculated luminance X is the measured value X 4 If it agrees, it is determined that the estimated deterioration amount is correct. The calculated luminance X is the measured value X 4 If it is larger, the degree of assumed deterioration is further increased (the value of X is decreased in FIG. 2). The calculated luminance X is the measured value X 4 If it is smaller, the assumed degree of deterioration is further reduced (the value of X is increased in FIG. 2). The calculated luminance X is the measured value X 4 Repeat until it matches.
The deterioration amount estimation unit 105 outputs the RGB deterioration amount estimation values to the color correction parameter calculation unit 106.
[0057]
The color correction parameter calculation means 106 calculates a color correction parameter from the respective RGB deterioration amount estimation values. The color correction parameter calculation unit 106 outputs the color correction parameter to the color correction unit 102.
In the following operation, the EL color display device according to the second embodiment is the same as that of the first embodiment, and thus the description thereof is omitted.
[0058]
As described above, in the second embodiment, even when the input level is not the maximum value, it is possible to estimate the aging deterioration amount of each color from the aging deterioration amount of the luminance level measured by the luminance sensor. It is possible to correct the aging degradation amount more accurately than the first embodiment when performing the operation of displaying the video signal.
[0059]
<< Embodiment 3 >>
An EL color display device according to Embodiment 3 of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram showing a configuration of an EL color display device according to Embodiment 3 of the present invention. Since the configuration of the EL color display device according to the third embodiment of the present invention (FIG. 1) is the same as that of the first and second embodiments, the description thereof is omitted.
The organic EL color display device according to the third embodiment differs from the first and second embodiments in the method in which the deterioration amount estimation unit 105 derives the deterioration amount estimation value. In other respects, the EL color display device of the third embodiment is the same as that of the second embodiment.
[0060]
Hereinafter, a method by which the deterioration amount estimation unit 105 derives the deterioration amount estimated value will be described.
In the third embodiment, it is assumed that the deterioration amount estimation unit 105 has a relationship of Expression 6 which is a linear linear expression with each video signal RGB to which the luminance X of the color EL panel is input. The deterioration amount estimation unit 105 determines luminance (X) for three or more sets of video input signals (R video signal, G video signal, and B video signal) having different RGB ratios. 3 ) And substituting the measured value into Equation 6, each coefficient abc in Equation 6 is obtained. Measurement is performed when all of the input video signals RGB at the time of measurement have a certain level or more in at least one measurement. The deterioration amount estimation unit 105 stores Equation 6. The obtained coefficient abc becomes smaller as the deterioration progresses. The degradation amount estimation means 105 obtains R degradation information, G degradation information, and B degradation information (degradation amount estimation value) indicating the degree of degradation of RGB sub-pixels of the color EL panel based on the obtained coefficient abc. To derive. The deterioration amount estimation means 105 of the third embodiment stores the coefficient abc in the initial state (before deterioration) and compares it with the coefficient abc after deterioration to derive the deterioration amount estimated value.
The estimated deterioration amount may be obtained based on a change in the value of the coefficient abc itself.
The estimated deterioration amount may be obtained based on the change in the relative value of the coefficient abc. For example, the estimated deterioration amount is obtained based on the change in the b / a value and the c / a value.
The deterioration amount estimation unit 105 outputs the RGB deterioration amount estimation values to the color correction parameter calculation unit 106.
[0061]
The color correction parameter calculation means 106 calculates a color correction parameter from the respective RGB deterioration amount estimation values. The color correction parameter calculation unit 106 outputs the color correction parameter to the color correction unit 102.
In the following operations, the EL color display device according to the third embodiment is the same as that of the first embodiment, and thus the description thereof is omitted.
[0062]
As described above, in the third embodiment, the luminance level of each color is measured by the luminance sensor. In comparison, it is possible to correct the amount of aging deterioration more accurately.
[0063]
In the above first to third embodiments, the amount of aging deterioration is measured using the luminance sensor, so that the aging deterioration is not affected by variations in the amount of aging deterioration among individual EL color displays and the use conditions such as ambient temperature. It is possible to correct the amount accurately.
In the present invention, when measuring the amount of aging deterioration, an expensive device such as a spectrometer for directly measuring a color change is not used. The luminance is measured using an inexpensive luminance sensor, and the color change is estimated from the result. This realizes an EL color display device that can correct the amount of aging correctly with an inexpensive configuration.
Color conversion is used for color correction instead of white balance adjustment. By adding color enhancement to the color conversion, it is possible to perform correction that enables more vivid image display without matching the color with the greatest deterioration over time.
[0064]
In the embodiment of the present invention, the input signal is an 8-bit RGB digital signal, but the input signal may be an arbitrary color image signal.
In the embodiment of the present invention, the luminance sensor is installed at a position directly in front of the center of the color EL panel at a certain distance. Alternatively, an additional EL element may be provided outside the effective screen of the color EL panel, and light from the element may be measured. The screen configuration in this case is shown in FIG. In FIG. 5, reference numeral 500 denotes an effective screen, and reference numeral 501 denotes an EL element additionally provided for measuring aging deterioration. The portion 501 is actually structured so that the luminance can be measured with a luminance sensor, and the upper surface is shielded so that the viewer cannot see the EL element so as not to hinder viewing.
For example, by integrating the luminance sensor so as to cover the upper surface of the additional EL element 501 of the color EL panel, it is possible to simultaneously realize a concealment function from a viewer and a measurement function of secular change. An example of such a configuration is shown in FIG. Reference numeral 600 denotes a glass substrate, 601 denotes a transparent electrode, 602 denotes a hole transport layer, 603 denotes a light emitting layer, 604 denotes an electron transport layer, 605 denotes an electrode, and 600 to 605 form a color EL panel. Reference numeral 610 denotes a substrate, 611 denotes a charge transfer portion, 612 denotes an insulating film, 613 denotes a silicon gate, 614 denotes a light shielding film, 615 denotes a photosensor, and 610 to 615 constitute a luminance sensor.
[0065]
The additional EL element 501 includes n RGB sub-pixels (n is an arbitrary integer greater than or equal to 1). The photosensor 615 has a substantially constant light detection sensitivity in a band including RGB wavelengths. When the photodetection sensitivity of the photosensor 615 has a predetermined frequency characteristic, a coefficient or the like for correcting the frequency characteristic is stored, and correction can be performed by the input level detection means or the deterioration amount estimation means. The photosensor 615 receives light from all the subpixels of the additional EL element 501 and outputs a detection signal thereof. In the embodiment, the photosensor 615 is one element, and outputs a detection signal corresponding to the total amount of light from all the subpixels.
The photosensor 615 includes m light receiving elements (m is an arbitrary integer greater than or equal to 1), and each light receiving element receives light from n sub-pixels of RGB (n is an arbitrary integer greater than or equal to 1). A detection signal corresponding to the total amount of light may be output.
[0066]
The color EL panel displays an image when the light emitting layer 603 emits light, but this light is transmitted through the hole transport layer 602, the transparent electrode 601, and the glass substrate 600, and is output upward in FIG. Among these, by configuring the luminance sensor above the portion corresponding to the additional EL element (pixel) 501, the luminance of the additional EL element 501 can be measured by the photo sensor 615 in the luminance sensor, and at the same time, the additional EL A function of hiding the element 501 from the viewer can also be realized.
When the configuration of FIG. 6 is used, the same image as a part of the effective screen 500 is output so that the additional EL element 501 has an aging deterioration amount as close as possible to the effective screen 500. good. Further, during measurement, a test signal for measurement is output only to the additional EL element 501, and the effective screen 500 is set to a normal operation, so that accurate measurement is performed without making the viewer aware of the display of the test signal. It becomes possible.
[0067]
FIG. 7 is a diagram showing a configuration for receiving the side leakage light of the color EL panel by arranging the luminance sensor beside the color EL panel. In FIG. 7, the same parts as those in FIG. In a color EL panel, a phenomenon occurs in which light emitted from the light emitting layer 603 leaks in the lateral direction. By utilizing this, a luminance sensor is arranged beside the color EL panel, whereby light emitted from the light emitting layer 603 and leaked in the horizontal direction can be measured by the photosensor 615. In this case, the additional EL element 501 as shown in FIG. 5 is not necessary, and it is possible to measure the light emission luminance at the outer periphery with a luminance sensor after forming a color EL panel with only an effective screen. . In the embodiment, the luminance sensor is a single element, and outputs a detection signal corresponding to the total amount of light from each of n subpixels of RGB (n is an arbitrary integer equal to or greater than 1).
The luminance sensor is composed of m light receiving elements (m is an arbitrary integer equal to or greater than 1), and each light receiving element receives light from n sub-pixels of RGB (n is an arbitrary integer equal to or greater than 1). A detection signal corresponding to the total amount of the light may be output.
[0068]
In the embodiment of the present invention, it is detected that the level of the video signal input in the video is maximized and measured at that time. Instead, a normal display mode and a measurement mode are set on the color EL panel, and test signals (for example, a video signal at the maximum level or three sets of video signals having different RGB ratios) are used for measurement in the measurement mode. It may be generated and measured using this.
[0069]
【The invention's effect】
According to the present invention, there is provided an EL color display device capable of accurately performing aging deterioration correction with consideration of variations in aging deterioration amounts between individual EL color displays and influences of use conditions such as ambient temperature with an inexpensive configuration. An advantageous effect that it can be realized is obtained.
Furthermore, according to the present invention, it is not necessary to make adjustments according to the color that has the largest amount of aging deterioration among RGB and the luminance is the lowest, and it is possible to display an image after aging correction more vividly. An advantageous effect that an EL color display device can be realized is obtained.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an EL color display device according to first to third embodiments of the present invention.
FIG. 2 is a graph showing deterioration characteristics of RGB light emitting elements with respect to luminance at the time of maximum level input of an EL color display.
FIG. 3 is a block diagram showing a configuration of color correction means of the EL color display device according to the first to third embodiments of the present invention.
FIG. 4 is a CIExy chromaticity diagram.
FIG. 5 is a diagram showing a case where an EL element is provided outside an effective screen of a color EL panel.
6 is a diagram showing a configuration in which a luminance sensor is integrated in FIG.
FIG. 7 is a diagram showing a configuration for receiving lateral leakage light of a color EL panel by a luminance sensor.
FIG. 8 is a graph showing luminance deterioration characteristics over time of RGB organic EL elements.
[Explanation of symbols]
101 color EL panel
102 color correction means
103 Input level detection means
104 Luminance sensor
105 Deterioration amount estimation means
106 Color correction parameter calculation means
111, 112, 113 input terminals

Claims (8)

  1. R video signal, G video signal, and B video signal are input, color correction is performed on these video signals based on the color correction parameters, and colors are output as corrected R video signal, corrected G video signal, and corrected B video signal Correction means;
    A color electroluminescence panel (hereinafter abbreviated as “color EL”) that receives the corrected R video signal, the corrected G video signal, and the corrected B video signal and emits RGB sub-pixels to perform color display;
    A luminance sensor that measures luminance in a display image of the color EL panel and outputs a luminance measurement value;
    R deterioration information and G deterioration information indicating the degree of deterioration of the RGB sub-pixels of the color EL panel from the luminance measurement values and the deterioration characteristics, stored in advance as the deterioration characteristics of the RGB sub-pixels of the color EL panel. And a deterioration information generating means for deriving and outputting the deterioration information;
    Color correction parameter calculation means for calculating the color correction parameter from the R deterioration information, G deterioration information and B deterioration information and outputting the color correction parameter to the color correction means;
    An EL color display device comprising:
  2. Inputting the R video signal, the G video signal, and the B video signal, detecting that these video signals have reached a predetermined value, and further comprising an input level detecting means for outputting this detection signal,
    The deterioration information generation means receives the detection signal, and calculates the R deterioration information, G deterioration information, and the luminance measurement value when the R video signal, the G video signal, and the B video signal have the predetermined values. 2. The EL color display device according to claim 1, wherein B deterioration information is derived and output.
  3. The degradation information generation means indicates the degree of degradation of RGB sub-pixels of the color EL panel from the luminance measurement value, the input R video signal, G video signal and B video signal, and degradation characteristics. 2. The EL color display device according to claim 1, wherein R deterioration information, G deterioration information, and B deterioration information are derived and output.
  4. R video signal, G video signal, and B video signal are input, color correction is performed on these video signals based on the color correction parameters, and colors are output as corrected R video signal, corrected G video signal, and corrected B video signal Correction means;
    A color EL panel that inputs the corrected R video signal, the corrected G video signal, and the corrected B video signal, emits RGB sub-pixels, and performs color display;
    A luminance sensor that measures luminance in a display image of the color EL panel and outputs a luminance measurement value;
    Based on the three or more sets of the R video signal, the G video signal, and the B video signal having different ratios between the input video signals, and the luminance measurement value of each set, the RGB sub-pixels of the color EL panel Deterioration information generating means for deriving and outputting R deterioration information, G deterioration information and B deterioration information indicating the degree of deterioration;
    Color correction parameter calculation means for calculating the color correction parameter from the R deterioration information, G deterioration information and B deterioration information and outputting the color correction parameter to the color correction means;
    An EL color display device comprising:
  5. The EL color display device according to claim 1, wherein the color correction unit performs a color conversion process by matrix calculation.
  6. 6. The color EL panel according to claim 1, wherein an additional EL element is provided outside an effective screen, and the luminance sensor measures the luminance of the additional EL element. 2. An EL color display device according to 1.
  7. The said brightness | luminance sensor is arrange | positioned at the side surface of the said color EL panel, and measures the brightness | luminance of the light which leaks sideways from the said color EL panel, The claim in any one of Claims 1-5 characterized by the above-mentioned. EL color display device.
  8. 8. The EL color display device according to claim 6, wherein the luminance sensor has an integrated structure with the color EL panel. 9.
JP2003179915A 2003-06-24 2003-06-24 El color display device Pending JP2005017520A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003179915A JP2005017520A (en) 2003-06-24 2003-06-24 El color display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003179915A JP2005017520A (en) 2003-06-24 2003-06-24 El color display device

Publications (1)

Publication Number Publication Date
JP2005017520A true JP2005017520A (en) 2005-01-20

Family

ID=34181113

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2003179915A Pending JP2005017520A (en) 2003-06-24 2003-06-24 El color display device

Country Status (1)

Country Link
JP (1) JP2005017520A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007156044A (en) * 2005-12-05 2007-06-21 Sony Corp Spontaneous light emission display device, gray scale value/deterioration rate conversion table update device, and program
JP2007163712A (en) * 2005-12-12 2007-06-28 Sony Corp Display panel, self-luminous display device, gradation value/degradation rate conversion table updating device, input display data correction device, and program
JP2007187761A (en) * 2006-01-11 2007-07-26 Sony Corp Self-luminous display, estimated degradation information correction device, input display data correction device, and program
JP2007206463A (en) * 2006-02-02 2007-08-16 Sony Corp Self-luminous display device, input display data correction device, and program
JP2007206464A (en) * 2006-02-02 2007-08-16 Sony Corp Spontaneous display device, estimation degradation information correction device, input display data compensation device, and program
JP2011528137A (en) * 2008-07-14 2011-11-10 グローバル・オーエルイーディー・テクノロジー・リミテッド・ライアビリティ・カンパニーGlobal Oled Technology Llc. Ways to improve display lifetime

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007156044A (en) * 2005-12-05 2007-06-21 Sony Corp Spontaneous light emission display device, gray scale value/deterioration rate conversion table update device, and program
JP2007163712A (en) * 2005-12-12 2007-06-28 Sony Corp Display panel, self-luminous display device, gradation value/degradation rate conversion table updating device, input display data correction device, and program
JP2007187761A (en) * 2006-01-11 2007-07-26 Sony Corp Self-luminous display, estimated degradation information correction device, input display data correction device, and program
JP2007206463A (en) * 2006-02-02 2007-08-16 Sony Corp Self-luminous display device, input display data correction device, and program
JP2007206464A (en) * 2006-02-02 2007-08-16 Sony Corp Spontaneous display device, estimation degradation information correction device, input display data compensation device, and program
JP2011528137A (en) * 2008-07-14 2011-11-10 グローバル・オーエルイーディー・テクノロジー・リミテッド・ライアビリティ・カンパニーGlobal Oled Technology Llc. Ways to improve display lifetime

Similar Documents

Publication Publication Date Title
US9659532B2 (en) Four-channel transmissive display system
US9418587B2 (en) Compensation technique for color shift in displays
US20180090050A1 (en) Oled display system and method
JP2016197249A (en) Fast calibration of displays using spectral-based colorimetrically calibrated multicolor camera
KR101523854B1 (en) Adaptive color correction for display with backlight modulation
KR101041882B1 (en) Transforming three color input signals to more color signals
TWI291162B (en) Method and apparatus for converting from source color space to RGBW target color space
TWI396160B (en) Self - luminous display device
US8289344B2 (en) Methods and apparatus for color uniformity
US7170477B2 (en) Image reproducing method, image display apparatus and picture signal compensation device
KR101147084B1 (en) Apparatus and method for driving liquid crystal display device
JP5010814B2 (en) Manufacturing method of organic EL display device
EP2135461B1 (en) Input-signal transformation for rgbw displays
US8373644B2 (en) Backlight luminance control apparatus and video display apparatus
US9501983B2 (en) Color conversion device, display device, and color conversion method
US8243210B2 (en) Apparatus and method for ambient light adaptive color correction
US7859492B2 (en) Assuring uniformity in the output of an OLED
TWI441157B (en) Methods and systems for correction display characteristics
US6677958B2 (en) Method for calibrating, characterizing and driving a color flat panel display
CN102237025B (en) Lookup table generation method used in display color correction
KR101065406B1 (en) Display device, video signal correction system, and video signal correction method
EP2311025B1 (en) Converting three-component to four-component image
WO2016062248A1 (en) Image display control method and device for woled display device, and display device
US7969428B2 (en) Color display system with improved apparent resolution
JP4856249B2 (en) Display device

Legal Events

Date Code Title Description
RD02 Notification of acceptance of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7422

Effective date: 20050524