TWI543584B - Luminance measurement method, luminance measurement apparatus and image quality adjustment technique using the same - Google Patents

Description

Brightness measuring method, luminance measuring device, and image quality adjusting technique using the same

The present invention relates to a luminance measuring method, a luminance measuring device, and an image quality adjusting technique using the methods and devices for measuring the luminance of each pixel of a display panel.

It is known that display unevenness (unevenness in luminance and unevenness in color) occurs in display panels such as liquid crystal panels or organic EL panels due to variations in manufacturing. In the case where each pixel of the display panel has R, G, and B sub-pictures, the relative brightness of R, G, and B in each picture cell is not different, but is close. When there is a difference in the absolute brightness between the picture elements, unevenness in luminance is formed. In addition, when the relationship between the relative brightness of R, G, and B in each of the picture elements is different between the adjacent picture elements, color unevenness is formed. In particular, in the organic EL panel, since it is difficult to make the thickness of the organic compound layer of each of the pixels uniform, it is easy to cause display unevenness due to inconsistency in layer thickness, and it is not easy to achieve a large screen.

For the technique of reducing the above-described display unevenness and improving the image quality of the display panel, for example, the luminance measuring method described in Patent Document 1 is used. In this method, all the pixels of the display panel ("pixels" in the document) are turned on, and each of the pixels is photographed at a plurality of photographing points of the CCD camera (refer to FIG. 5 of the document). The luminance data of the shooting points are used to calculate the luminance of the pixel. Correction data for reducing the display unevenness is generated using the calculated luminance of each of the pixels, and the input signal of the display panel is corrected based on the correction data, thereby improving the image quality of the display panel. (Previous Technical Literature) (Patent Literature)

Patent Document 1: Japanese Laid-Open Patent Publication No. 2010-203889

(The problem that the invention wants to solve)

However, in Patent Document 1, the image of each panel of the display panel is independently imaged on the imaging surface of the camera, and the images of adjacent pixels are not overlapped with each other, but in reality, the adjacent pixels are They overlap each other like the lens aberration of the camera. Therefore, in order to correctly measure the luminance of the pixel, it is not possible to directly use the output of the pixel on which the image of the pixel is located on the surface of the image, and the effect of the pixel adjacent to the pixel must be removed from the pixel. .

On the other hand, even if the images of the adjacent pixels are stacked one on another, the pixels are illuminated one by one to measure the luminance one by one. In general, the luminance of the pixels is individually lit and the overall point. In the case of the bright case (when all the cells are simultaneously illuminated), even if the correction data for reducing the display unevenness is generated by using the luminance that is illuminated and measured one by one, it cannot be well eliminated. Display uneven.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a luminance measuring method, a luminance measuring device, and an image quality adjusting technique using the same, and an image of a panel of a display panel on a photographing surface of a camera The stacking is also able to accurately measure the luminance of each pixel. (the way to solve the problem)

In order to solve the above problems, a first aspect of the present invention is a method for measuring luminance, comprising: a single-pictured photographing step of causing the display to be performed when a picture of a display panel is photographed by a camera having a solid-state imaging element One or more pixels of the panel are illuminated and photographed by using the above camera, and the image of the pixel covers a plurality of pixels on the photographing surface of the camera and the images of the pixels are not overlapped with each other; the calculation of the exposure coefficient a step of calculating, according to an output of one or more pixels corresponding to a central portion of the image of the pixel photographed in the single-pictured photographing step, calculating a central portion of the image of the image of the pixel a central exposure coefficient of a ratio of the overall luminance, and calculating a luminance of a peripheral portion of the image representing the image of the pixel according to an output of one or more pixels corresponding to a peripheral portion of the image of the pixel described above The peripheral exposure factor of the ratio of the overall luminance of the image; all the steps of the photographing process are such that all the pixels of the above display panel are illuminated and the photograph is taken Photographing; luminance and luminance calculating step, the captured image captured in the step, the central and the peripheral exposure exposure coefficient coefficient all of the foregoing pixel grid, grid computing all pixels of the display panel.

According to a second aspect of the present invention, in the first aspect of the method for measuring luminance, the method includes: a aligning step of photographing, by using the camera, a aligning pattern that illuminates a predetermined image of the display panel, and The pixel of the camera is detected by detecting which pixel of the image of the alignment pattern is present, and the corresponding relationship between the pixel of the display panel and the pixel of the camera is obtained.

According to a third aspect of the present invention, in the first aspect or the second aspect, the brightness measuring method includes: an enlargement photographing step of zooming in on the above-described picture element by the single-pictured photographing step, thereby obtaining the image. The overall luminance of the image of the above-described picture element for calculating the central exposure coefficient and the peripheral exposure coefficient.

A fourth aspect of the present invention is a brightness measuring apparatus comprising: a control unit that controls lighting of a pixel of a display panel, and controls photographing by a camera having a solid-state imaging element; and an arithmetic unit that The captured image of the camera is calculated. When the camera photographs the pixel of the display panel, the control unit lights one or more pixels of the display panel and captures the image by the camera. And on the photographing surface of the camera, the image of the pixel includes a plurality of pixels and the images of the pixels are not overlapped with each other, and then the arithmetic unit is based on one of the central portions of the image corresponding to the photographed pixel Or an output of the plurality of pixels, a central exposure coefficient indicating a ratio of a central portion of the image of the pixel of the image to the overall luminance of the image of the pixel, and a peripheral portion corresponding to the peripheral portion of the image corresponding to the pixel The output of one or more pixels is calculated to represent the ratio of the ratio of the peripheral luminance of the image of the above-described pixel to the overall luminance of the image of the pixel The light control unit causes the control unit to light all the pixels of the display panel and capture the image by the camera, and the calculation unit calculates the display panel based on the captured image, the central exposure coefficient, and the peripheral exposure coefficient. The full picture of the brightness of the plain.

According to a fifth aspect of the present invention, in the fourth aspect, the control unit captures, by the camera, a registration pattern in which a predetermined pixel of the display panel is lit, and the operation is performed. The detecting unit detects which pixel of the camera is present in the image of the alignment pattern, thereby obtaining a correspondence relationship between the pixel of the display panel and the pixel of the camera.

According to a sixth aspect of the invention, in the fourth aspect or the fifth aspect of the brightness measuring apparatus, the control unit is larger than one or more pixels for obtaining a central portion of the image corresponding to the pixel Outputting an output of one or a plurality of pixels corresponding to a peripheral portion of the image corresponding to the pixel, and magnifying the image element to perform imaging, and the computing unit obtains the image of the image based on the captured image The overall luminance is calculated by calculating the above-mentioned central exposure coefficient and the above peripheral exposure coefficient.

A seventh aspect of the present invention is a method for generating a correction data, comprising: a single-pictured photographing step of causing one of the display panels to be photographed when a picture of a display panel is photographed by a camera having a solid-state imaging element; The plurality of pixels are illuminated and photographed by using the above camera, and the image of the picture element covers a plurality of pixels on the imaging surface of the camera and the images of the pixels are not overlapped with each other; the exposure coefficient calculation step is performed according to the correspondence Outputting one or more pixels in the central portion of the image of the pixel photographed in the single-pictured photographing step, and calculating the overall luminance of the image of the image of the image of the image of the pixel The central exposure coefficient of the ratio, and based on the output of one or more pixels corresponding to the peripheral portion of the image of the above-described pixel, the peripheral portion of the image representing the image of the pixel is calculated as a whole of the image of the pixel The peripheral exposure coefficient of the ratio of the luminance; all the photographing steps are performed, so that all the pixels of the display panel are illuminated, and the camera is used for shooting; a calculating step of calculating a luminance of all the pixels of the display panel based on the captured image in the all-pictured photographing step, the central exposure coefficient, and the peripheral exposure coefficient; and a correction data generating step according to the luminance calculation The luminance calculated in the step generates correction data for correcting the input signal of the display panel to reduce luminance unevenness of the display panel.

According to an eighth aspect of the present invention, in a seventh aspect of the present invention, there is provided a method for generating a correction data, comprising: a aligning step of photographing a aligning pattern obtained by illuminating a predetermined image of the display panel by using the camera And detecting which pixel of the camera of the image of the alignment pattern is present, thereby obtaining a correspondence relationship between the pixel of the display panel and the pixel of the camera.

According to a ninth aspect of the present invention, in the correction data generating method of the seventh aspect or the eighth aspect, the step of enlarging the photographing is performed, and the photographing unit is further enlarged than the single-character photographing step, and the photographing is performed. Taking the overall luminance of the image of the above-described pixel for calculating the central exposure coefficient and the peripheral exposure coefficient.

A tenth aspect of the present invention is a correction data generating apparatus comprising: a control unit that controls lighting of a pixel of a display panel, and controls photographing by a camera having a solid-state imaging element; and an operation unit according to the operation unit And calculating a captured image of the camera; and a correction data generating unit that generates correction data for correcting an input signal of the display panel to reduce luminance unevenness of the display panel; and painting the display panel by using the camera When the photographer is photographed, the control unit lights one or more of the display panels to be photographed by the camera, and causes the image of the image to cover a plurality of pixels and draws on the photographing surface of the camera. The image of the prime cells does not overlap each other, and then the calculation unit calculates the luminance of the central portion of the image representing the pixel based on the output of one or more pixels corresponding to the central portion of the image of the captured pixel. The central exposure coefficient of the ratio of the overall luminance of the image of the above-described picture, and according to the periphery of the image corresponding to the above-mentioned picture And outputting one or more pixels, calculating a peripheral exposure coefficient indicating a ratio of a peripheral luminance of the image of the pixel to the overall luminance of the image of the pixel, and the control unit makes all the pixels of the display panel When the light is turned on and the image is captured by the camera, the calculation unit calculates the luminance of all the pixels of the display panel based on the captured image, the central exposure coefficient, and the peripheral exposure coefficient, and the correction data generation unit is configured according to the above. The brightness of all the picture elements of the display panel is generated, and the above correction data is generated.

According to an eleventh aspect of the present invention, in the correction data generating apparatus of the tenth aspect, the control unit photographs a registration pattern obtained by lighting a predetermined pixel of the display panel by the camera, and The calculation unit detects which pixel of the camera is present in the image of the alignment pattern, thereby obtaining a correspondence relationship between the pixel of the display panel and the pixel of the camera.

According to a twelfth aspect of the present invention, in the tenth aspect or the eleventh aspect of the correction data generating apparatus, the control unit is one or more than a center portion for obtaining an image corresponding to the image element The output of the pixel and the output of the one or more pixels corresponding to the peripheral portion of the image of the pixel are further enlarged to capture the image, and the computing unit obtains the image based on the captured image. The overall luminance of the image is calculated by calculating the above-mentioned central exposure coefficient and the above peripheral exposure coefficient.

A thirteenth aspect of the present invention is a method of manufacturing an image quality adjustment type display panel, comprising: a single-pictured photographing step of photographing a picture element of a display panel by using a camera having a solid-state imaging element; One or more pixels of the display panel are illuminated and photographed by using the camera, and the image of the pixel covers a plurality of pixels on the photographing surface of the camera and the images of the pixels are not overlapped with each other; a coefficient calculating step of calculating, according to an output of one or more pixels corresponding to a central portion of the image of the pixel photographed in the single-pictured photographing step, the central portion of the image representing the image of the pixel is occupied by the pixel a central exposure coefficient of the ratio of the overall luminance of the image, and calculating the brightness of the peripheral portion of the image representing the image of the pixel according to the output of one or more pixels corresponding to the peripheral portion of the image of the pixel The peripheral exposure factor of the ratio of the overall luminance of the image of the Suge; all the steps of the photographing process are such that all the pixels of the above display panel are illuminated and the photograph is taken Performing a photographing; a luminance calculating step of calculating a luminance of all the pixels of the display panel based on the captured image of the entire photographing step, the central exposure coefficient, and the peripheral exposure coefficient; and the correction data generating step, according to the above The luminance calculated in the luminance calculation step generates correction data for correcting the input signal of the display panel to reduce luminance unevenness of the display panel; and corrects the data memory step to memorize the correction data in the memory portion of the image quality adjustment circuit And an installation step of mounting the image quality adjustment circuit on the display panel such that the image quality adjustment circuit corrects the input signal based on the correction data.

According to a fourteenth aspect of the present invention, in a method for manufacturing an image quality adjustment type display panel of the thirteenth aspect, the method includes: a aligning step of lighting a predetermined image of the display panel by the camera The alignment pattern is photographed, and which pixel of the camera is imaged by the image of the alignment pattern is detected, thereby obtaining the correspondence between the pixel of the display panel and the pixel of the camera.

According to a fifteenth aspect of the present invention, in the method of manufacturing the image quality adjustment type display panel of the thirteenth aspect or the fourteenth aspect, the method includes: an enlargement photographing step, which is more enlarged than the single photographing step The image is photographed, and the overall luminance of the image of the above-described picture element for calculating the central exposure coefficient and the peripheral exposure coefficient is obtained.

A sixteenth aspect of the present invention is an image quality adjustment type display panel, comprising: a display panel; and an image quality adjustment circuit, comprising: a memory portion for memorizing correction of an input signal of the display panel to reduce the above a correction material for displaying unevenness of the display panel; and the correction data generated in the memory unit is stored in the memory unit: when the image of the display panel is photographed by a camera having a solid-state imaging element, the display panel is caused One or more of the pixels are illuminated and photographed by using the above camera, and on the photographing surface of the camera, the image of the pixel covers a plurality of pixels and the images of the plain cells do not overlap each other, and according to the corresponding An output of one or more pixels in a central portion of the image of the captured image, and a central exposure coefficient that calculates a ratio of a central portion of the image of the image of the pixel to an overall luminance of the image of the image, and Calculating the peripheral luminance of the image representing the above-described picture element based on the output of one or more pixels corresponding to the peripheral portion of the image of the above-described picture element The peripheral exposure coefficient of the ratio of the overall luminance of the image of the picture element is such that all the pixels of the display panel are illuminated and imaged by the camera, and based on the captured image, the central exposure coefficient, and the peripheral exposure coefficient, The luminance of all the pixels of the display panel is calculated, and the correction data is generated according to the luminance of all the pixels of the display panel.

According to the invention of the first aspect or the fourth aspect, the camera is used to photograph the pixels of the display panel, and the images of the panel of the display panel are not overlapped with each other on the photographing surface of the camera, and the drawing is calculated. The central exposure coefficient of the ratio of the luminance of the center of the image of the image of the image of the image of the image of the image of the image of the image of the image, and the ratio of the brightness of the peripheral part of the image of the image of the image of the image of the image of the image of the image Moreover, all the pixels of the display panel are illuminated and photographed by the camera, and the luminance of all the pixels of the display panel is calculated according to the captured image, the central exposure coefficient, and the peripheral exposure coefficient, so even the display panel is The images are stacked on the imaging surface of the camera, and the influence of the images of adjacent pixels can be removed, and the luminance of each pixel can be accurately measured.

According to the invention of the second aspect or the fifth aspect, the camera uses a camera to capture a registration pattern that illuminates a predetermined frame of the display panel, and detects which pixel of the camera the image of the alignment pattern is presented in, In order to obtain the correspondence between the pixel of the display panel and the pixels of the camera, it is possible to increase the accuracy of the correlation between the imaging result (the output of each pixel) and the luminance of each pixel by using the correspondence relationship, and more accurately The luminance of each picture element is measured.

According to the invention of the third aspect or the sixth aspect, by enlarging the image of the picture element (the image of the picture is covered on the shooting surface to cover more pixels), the image of the picture is taken as a whole. According to the luminance, it is possible to suppress a decrease in measurement accuracy caused by a non-light-receiving portion between pixels located on the imaging surface, and it is possible to more accurately measure the luminance of each pixel.

According to the invention of the seventh aspect or the tenth aspect, similarly to the invention of the first aspect or the fourth aspect, the camera is used to photograph the pixels of the display panel, and the images of the panels of the display panel are made to each other. Do not overlap on the imaging surface of the camera, and calculate a central exposure coefficient indicating the ratio of the luminance of the central portion of the image of the image of the image to the overall luminance of the image of the image, and the brightness of the peripheral portion of the image representing the image of the image. The peripheral exposure factor of the ratio of the overall luminance of the image of the Sugue, and the entire display of the display panel is illuminated and photographed by the camera, and the display panel is calculated based on the captured image, the central exposure coefficient, and the peripheral exposure coefficient. Since the luminance of the plain cells is drawn, even if the images of the pixels of the display panel are stacked on the imaging surface of the camera, the influence of the images of the adjacent pixels can be removed, and the luminance of each of the pixels can be accurately measured. Further, since the correction data for reducing the luminance unevenness of the display panel is generated based on the luminance of each of the display panels, it is possible to generate correction data capable of adjusting the image quality of the display panel with high precision.

According to the invention of the eighth aspect or the eleventh aspect, in the same manner as the invention of the second aspect or the fifth aspect, the alignment pattern for lighting the predetermined image of the display panel is photographed by the camera, And detecting which pixel of the camera image is displayed on the image of the alignment pattern, thereby obtaining the correspondence between the pixel of the display panel and the pixel of the camera, so that the shooting result (the output of each pixel) can be made by using the correspondence relationship The correctness of the correlation of the luminance of each picture is increased, and the luminance of each picture element is more accurately determined. Further, since the correction data for reducing the luminance unevenness of the display panel is generated based on the luminance of each of the pixels of the display panel, it is possible to generate correction data capable of adjusting the image quality of the display panel with higher precision.

According to the invention of the ninth aspect or the twelfth aspect, as in the third aspect or the sixth aspect of the invention, by enlarging the image of the picture element (the image of the picture is covered on the shooting surface to cover more The pixel is captured and the overall luminance of the image of the image is obtained. Therefore, the measurement accuracy caused by the non-light-receiving portion between the pixels on the imaging surface can be suppressed, and the measurement of each pixel can be more accurately measured. Brightness. Further, since the correction data for reducing the luminance unevenness of the display panel is generated based on the luminance of each of the display panels, it is possible to generate correction data capable of adjusting the image quality of the display panel with higher precision.

According to the invention of the thirteenth aspect or the sixteenth aspect, in the same manner as the invention of the seventh aspect or the tenth aspect, the correction data is generated, and the image quality adjustment circuit in which the correction data is stored is installed in the display panel Therefore, the image quality of the display panel can be adjusted with high precision.

According to the invention of the fourteenth aspect, as in the eighth aspect or the eleventh aspect of the invention, the correction data is generated, and the image quality adjustment circuit storing the correction data is installed in the display panel, thereby being able to be higher Accurately adjust the image quality of the display panel.

According to the invention of the fifteenth aspect, in the same manner as the invention of the ninth aspect or the twelfth aspect, the correction data is generated, and the image quality adjustment circuit storing the correction data is mounted in the display panel, thereby being able to be higher Accurately adjust the image quality of the display panel. (Effect of the invention)

According to the present invention, even if the images of the pixels of the display panel are stacked on the imaging surface of the camera, the luminance of each of the pixels can be accurately measured, and the measured luminance can be used to improve the image quality of the display panel.

The form for carrying out the invention will be described below using the drawings.

(Embodiment 1) FIG. 1 shows a luminance measuring apparatus according to this embodiment. In the luminance measuring apparatus 1, all the pixels of the organic EL panel 2 are measured (the respective pixels of the organic EL panel 2 are composed of R, G, and B sub-pictures, and in the present invention, the sub-pictures are also included. The device for luminance in the "picture" is provided with a control unit 3, a calculation unit 4, and a memory unit 5. The control unit 3 controls the display of the organic EL panel 2 by the pattern generating device 6, and controls the shooting by the black-and-white solid-state imaging device camera 7 facing the organic EL panel 2. The calculation unit 4 performs various calculations based on the captured image of the camera 7 and the like, and the storage unit 5 stores the imaging result of the camera 7 and the calculation result of the calculation unit 4 and the like.

When the luminance measuring device 1 measures the luminance when the pixel of the organic EL panel 2 is displayed in red, as shown in FIG. 2, first, the control unit 3 instructs the pattern generating device 6 to display the organic EL panel 2 as shown in FIG. The alignment pattern P _A (step 1 (labeled as "S.1" in the figure, the same applies hereinafter)). The alignment patterns P _A are obtained by illuminating the dots D of the red squares by illuminating a specific pixel (R sub-picture cells) at a known position on the organic EL panel 2.

The control unit 3 captures the organic EL panel 2 on which the registration pattern P _A is displayed by the camera 7 (step 2), and the calculation unit 4 detects that the image of the point D is presented (imaged) on the camera 7 based on the captured image. The pixel on the imaging surface is used to obtain the positional relationship between the pixel of the organic EL panel 2 and the pixel of the camera 7 (step 3), and is stored in the memory unit 5 (step 4).

Next, the control unit 3 instructs the pattern generation device 6 to display the exposure coefficient measurement pattern P ₁ shown in FIG. 4 on the organic EL panel 2 (step 5). The exposure coefficient measurement pattern P ₁ is a pixel cell at the leftmost upper side of the organic EL panel 2, a pixel cell set every three pixels from the pixel cell to the right, and from these pixels. The control unit 3 performs defocus imaging by the camera 7 (step 6), which is obtained by lighting the picture elements set for every three pixels. The shape or size of the image of the pixel on the imaging surface of the camera 7 differs depending on which position the image of the image is located on the imaging surface, but here roughly covers (and) the four pixels of the camera 7 × The size of the four pixels is, for example, as shown in FIG. 5, and the image I of a certain pixel covers the pixels 9a to 9p on the imaging surface 8 of the camera 7. Further, on the photographing surface of the camera 7, the images of adjacent pixels are not overlapped with each other.

The calculation unit 4 obtains the overall luminance of the image of the pixel based on the captured image in step 6 (step 7). For example, if the overall luminance of the image I of the picture is 1, it can be obtained from the outputs of the pixels 9a to 9p. The overall luminance of the image of the obtained pixel is stored in the memory unit 5 for each pixel in the lighting of the pattern P ₁ for measuring the exposure coefficient (step 8).

Next, the control unit 3 performs focusing (alignment focus) imaging on the exposure coefficient measurement pattern P ₁ by the camera 7 (step 9). As described above, the shape or size of the image of the pixel on the imaging surface of the camera 7 differs depending on where the image of the image is located on the imaging surface, but here roughly covers three pixels of the camera 7 × The size of the three pixels is, for example, as shown in FIG. 6, and the image I of the picture element covers the pixels 9a to 9c, 9e to 9g, 9i to 9k on the imaging surface 8 of the camera 7. That is, compared with the case of defocus shooting (Fig. 5), the image I of the picture is reduced (in other words, in step 6 where the image of the plain cell covers more pixels than in step 9, the picture is enlarged and the picture is taken. At this time, the images of adjacent pixels are of course not overlapping each other.

The calculation unit 4 obtains the luminance of the central portion of the image of the pixel from the captured image in step 9 (step 10), stores it in the storage unit 5 (step 11), and obtains the image of the pixel. The eight peripheral luminances (step 12) are stored in the memory unit 5 (step 13). Here, the luminance of the central portion of the image of the picture is determined by the luminance of the output of the pixel where the center of gravity of the image of the picture is located, and the brightness of the eight peripheral parts of the image of the picture is corresponding to the pixel adjacent to the center of gravity. The luminance of the output of 8 pixels. Therefore, in FIG. 6, the central portion luminance of the image I of the pixel can be obtained from the output of the pixel 9f, and the luminance of the first peripheral portion of the image I of the pixel can be obtained from the output of the pixel 9a, according to the pixel 9b. The output obtains the luminance of the second peripheral portion of the image I of the image, calculates the luminance of the third peripheral portion of the image I of the pixel based on the output of the pixel 9c, and obtains the image I of the pixel according to the output of the pixel 9e. The luminance of the fourth peripheral portion is obtained by obtaining the luminance of the fifth peripheral portion of the image I of the pixel based on the output of the pixel 9g, and obtaining the luminance of the sixth peripheral portion of the image I of the pixel from the output of the pixel 9i, according to the pixel 9j. The output obtains the luminance of the seventh peripheral portion of the image I of the image, and obtains the luminance of the eighth peripheral portion of the image I of the pixel based on the output of the pixel 9k.

Furthermore, the calculation unit 4 calculates a central exposure coefficient which is obtained by dividing the luminance of the central portion of the image of the pixel obtained in step 10 by the overall luminance of the image of the pixel obtained in step 7. The obtained (step 14) is memorized in the memory unit 5 (step 15), and eight peripheral exposure coefficients are calculated, which are the eight periphery of the image of the pixel used in step 12 The luminance of each portion is obtained by dividing the overall luminance of the image of the pixel obtained in step 7 (step 16), and is stored in the memory unit 5 (step 17).

Then, with respect to the exposure coefficient measurement patterns P ₂ to P ₁₆ , the luminance measuring apparatus 1 performs the same processing as that of steps 5 to 15, and calculates a central exposure coefficient and eight peripheral exposure coefficients for each of the pixels (hereinafter, these are collectively referred to as "exposure factor"), which is memorized in the memory section 5 (step 18), wherein the measurement pattern exposure coefficient P ₂ by measuring the coefficient to the right by the exposure of each pixel grid pattern P ₁ in the first lighting The exposure coefficient measurement pattern P ₃ is formed by lighting the second image element on the right side of each of the pixels of the pixel for lighting the exposure coefficient measurement pattern P ₁ , and measuring the exposure coefficient. The pattern P ₄ is formed by lighting the third pixel of the right of each of the pixels of the pixel for lighting the exposure coefficient measurement pattern P ₁ , and the pattern for measuring the exposure coefficient P ₅ is a pattern for measuring the exposure coefficient. The _first pixel of the lower surface of each of the pixels that are lit by P ₁ is lit, and the exposure coefficient measurement pattern P ₆ is the first lower of each of the pixels that are illuminated by the exposure coefficient measurement pattern P ₂ . Each of the picture elements is lit, and the exposure coefficient measurement pattern P ₇ is a pattern P _{3 for} measuring the exposure coefficient. The first picture element below the illuminated pixels is lit, and the exposure coefficient measurement pattern P ₈ is the first picture below the respective element cells that light up the exposure coefficient measurement pattern P ₄ . The exposure coefficient measurement pattern P ₉ is formed by lighting the second image element below the respective pixel cells in which the exposure coefficient measurement pattern P ₁ is turned on, and the exposure coefficient measurement pattern P is formed. ₁₀ is a lighted _second photo element below the respective pixel cells in which the exposure coefficient measurement pattern P ₂ is turned on, and the exposure coefficient measurement pattern P ₁₁ is lit by the exposure coefficient measurement pattern P _{3 .} The second picture element below the respective picture elements is lit, and the exposure coefficient measurement pattern P ₁₂ is the second picture element below the respective picture elements that are illuminated by the exposure coefficient measurement pattern P ₄ . The exposure coefficient measurement pattern P ₁₃ is formed by lighting the third pixel element below the respective pixel cells for lighting the exposure coefficient measurement pattern P ₁ , and the exposure coefficient measurement pattern P ₁₄ is The third image element below the respective pixel cells in which the exposure coefficient measurement pattern P ₂ is lit is lit, and the exposure coefficient measurement map is used. The case P ₁₅ is obtained by lighting the _third pixel element below the respective pixel cells for lighting the exposure coefficient measurement pattern P ₃ , and the exposure coefficient measurement pattern P ₁₆ is the exposure coefficient measurement pattern P _{4 .} The third picture element below the illuminated picture is lit. Thereby, a total of nine exposure coefficients are calculated for all the cells of the organic EL panel 2.

However, the exposure coefficient is based on the lens aberration of the camera 7 or the like according to the position of the image of the pixel on the imaging surface of the camera 7 (the position of the pixel on which the center of gravity of the image of the image is located on the imaging surface) and the phase (picture) The offset between the center of the pixel where the center of gravity of the image of the prime cell is located and the center of gravity changes. That is to say, although the exposure coefficient is determined by the four parameters of the position δ _X , δ _Y and the phases α _X and α _Y of the image of the picture, the exposure coefficients of the respective pixels obtained in steps 5 to 18 are obtained. The position and phase of each of the cells are dispersed, and it is difficult to use when it is used in step 23 or the like to be described later. Therefore, the calculation unit 4 calculates the exposure coefficient based on the representative position and phase for each region of the organic EL panel 2 based on the exposure coefficient of each of the pixels obtained in the previous step (step 19), and uses it as an exposure coefficient. The table is stored in the memory unit 5 (step 20). Here, the exposure coefficient according to the position and phase representing the region is calculated for each region of the organic EL panel 2 because, for example, the shape of the image of the image element is sometimes in each region of the organic EL panel 2 (the camera 7 Each area of the photographing surface is approximately circular or approximately elliptical, as long as the exposure coefficient is prepared for several positions and phases in an area approximate to a circle, and for several positions and phases in an area approximate to an ellipse In the case of an exposure coefficient, when an exposure coefficient of an image of a pixel that approximates a circular shape is required, a representative exposure coefficient of a region approximate to a circle can be interpolated, and a pixel that approximates an ellipse is required. In the case of the exposure coefficient of the lattice image, a representative exposure coefficient of a region approximate to an elliptical shape can be interpolated.

When the exposure coefficient table is obtained, the control unit 3 instructs the pattern generation device 6 to display the luminance measurement pattern P _B on the organic EL panel 2 (step 21). The luminance measurement pattern P _B is a red image displayed on the entire surface of the organic EL panel 2 by simultaneously lighting all the pixels (all R sub-pixels) of the organic EL panel 2 .

The control unit 3 captures the organic EL panel 2 on which the luminance measurement pattern P _B is displayed by the camera 7 (step 22), and the calculation unit 4 calculates the luminance of all the pixels of the organic EL panel 2 based on the captured image (step 23), it is memorized in the memory unit 5 (step 24).

Specifically, the arithmetic unit 4 can recognize the camera 7 by using the correspondence relationship between the pixels of the organic EL panel 2 obtained in step 3 and the pixels of the camera 7 and the exposure coefficient tables generated in steps 19 and 20. Each pixel is an image showing which of the pixels of the organic EL panel 2 is present. In other words, it is understood that the image of an arbitrary pixel of the organic EL panel 2 is represented by a certain pixel of the camera 7 based on the above-described correspondence relationship, and it can be seen from the exposure coefficient table that the "image of an arbitrary picture" covers "some" The calculation unit 4 can grasp to what extent the pixels of the camera 7 are affected by which of the pixels of the organic EL panel 2 to what extent. In addition, the output of each pixel of the camera 7 (the amount of light received by each pixel) is determined by measurement, and when the organic EL panel 2 is lit (Raster), all the pixels are made. When the light is simultaneously turned on, the luminance of each of the pixels is unknown, so that, for example, as shown in FIG. 7, the pixel 9f of the camera 7 corresponds to the center of the image I ₅ of the picture, the image I ₁ to I of the picture. _{4. In} the case of the peripheral portion of I ₆ to I ₉ , if the luminance corresponding to the output of the pixel 9 f is B _9f , the luminance of the image I ₅ of the pixel is X ₅ , and the exposure coefficient of the central portion is k _{5 .} The luminance of the image I ₁ is X ₁ , the exposure coefficient with respect to the peripheral portion of the pixel ₉ f is k ₉ , and the luminance of the image I ₂ of the pixel is X ₂ , with respect to the peripheral portion of the pixel 9f. The exposure coefficient is k ₈ , the luminance of the image I ₃ of the picture element is X ₃ , the exposure coefficient of the peripheral portion of the pixel 9f is k ₇ , and the luminance of the image I ₄ of the picture element is X ₄ , exposure factor in the peripheral portion 9f of pixels k _6, provided pixel grid luminance image I is ₆ X _6, with respect to the exposure factor peripheral portion 9f of pixels k _4, Pixel grid of the image luminance I ₇ of X _7, relative to the exposure coefficient peripheral portion of the pixel 9f is k _3, provided pixel grid of the image luminance I ₈ as X _8, exposing the peripheral portion of the pixel 9f relative The coefficient is k ₂ , the luminance of the image I ₉ of the picture element is X ₉ , and the exposure coefficient of the peripheral portion of the pixel 9f is k ₁ , then the following equation holds: B _9f =k ₉ X ₁ +k ₈ X ₂ + k ₇ X ₃ + k ₆ X ₄ + k ₅ X ₅ + k ₄ X ₆ + k ₃ X ₇ + k ₂ X ₈ + k ₁ X ₉ . Since the above equation is also true for other pixels, the arithmetic unit 4 can obtain the luminance of all the prime cells by solving the simultaneous equations for the unknown number X composed of these equations.

In the above, the luminance measuring device 1 measures the luminance (the luminance of all the R sub-picture cells) when the pixel of the organic EL panel 2 is displayed in red. However, the luminance measuring device 1 can also measure the pixel of the organic EL panel 2 in the same manner. The luminance of the grid when displaying green (the luminance of all G sub-picture cells) and the luminance when displaying blue (the luminance of all B sub-pictures).

In the luminance measuring method using the luminance measuring apparatus 1 of the present embodiment, the pixels of the organic EL panel 2 are imaged by the camera 7 so that the images of the pixels of the organic EL panel 2 are on the imaging surface 8 of the camera 7. The upper part is not overlapped, and the central exposure coefficient indicating the ratio of the central portion of the image of the image of the picture to the overall luminance of the image of the picture is calculated, and the peripheral brightness of the image representing the picture of the picture is the image of the picture. The peripheral exposure coefficient of the ratio of the overall luminance is adjusted, and all the pixels of the organic EL panel 2 are lit and photographed by the camera 7, and the entire organic EL panel 2 is calculated based on the captured image, the central exposure coefficient, and the peripheral exposure coefficient. Since the luminance of the plain cells is displayed, even if the images of the pixels of the organic EL panel 2 are overlapped on the imaging surface 8 of the camera 7, the influence of the images of the adjacent pixels can be removed, and the squares of the respective pixels can be accurately measured. Brightness.

Further, in the luminance measuring apparatus 1, the alignment pattern P _A that lights up the predetermined pixel of the organic EL panel 2 is imaged by the camera 7, and the image of the alignment pattern P _A is detected and presented on the camera 7. Which pixel of the pixel is used to obtain the correspondence between the pixel of the organic EL panel 2 and the pixel of the camera 7, and the correctness of the correlation between the photographing result and the luminance of the pixel is increased by using the correspondence. Further, in step 6, the image of the pixel is enlarged to perform imaging, and in step 7, the overall luminance of the image of the pixel is obtained, so that it is possible to suppress the non-light-receiving portion between the pixels located on the imaging surface 8. The measurement accuracy is lowered, and the luminance of each pixel can be measured more accurately.

(Embodiment 2) FIG. 8 shows a correction data generating apparatus of this embodiment. The correction data generating device 10 is a device in which the ROM writer 11 is additionally connected to the luminance measuring device 1 of the first embodiment, and as shown in FIG. 9, the entire organic EL panel 2 is measured in the same manner as the luminance measuring device 1. The luminance of the prime cells (steps 1 to 24), and then, based on the luminance of each of the pixels, the calculation unit 4 generates correction data for reducing display unevenness (luminance unevenness) of the organic EL panel 2 (step 25) ). The generated correction data is written into the ROM (non-volatile memory) 12 by the ROM writer 11 (step 26), and is manufactured by mounting the image quality adjustment circuit 13 having the ROM 12 on the organic EL panel 2. The image quality adjustment type organic EL panel 14 is released (step 27).

In the image quality adjustment type organic EL panel 14, after the image signal is input (step 28), the image quality adjustment circuit 13 refers to the correction data written in the ROM 12, and the image signal (input signal) input to the organic EL panel 2 is input. The correction is performed, whereby the display unevenness of the organic EL panel 2 is reduced, and the image quality is adjusted (step 29).

In the correction data generation method using the correction data generating device 10 of the present embodiment and the method of manufacturing the image quality adjustment type organic EL panel 14, the luminance of each of the pixels of the organic EL panel 2 is measured in the same manner as in the first embodiment. Since the correction data for reducing the display unevenness of the organic EL panel 2 is generated based on the luminance of each of the pixels, the image quality of the organic EL panel 2 can be adjusted with high precision.

In the above, the embodiment of the present invention is not limited to the above-described embodiments, and the present invention is not limited thereto, and may be appropriately modified without departing from the spirit and scope of the invention.

For example, the display panel for image quality adjustment is not limited to the organic EL panel, and may be a liquid crystal panel, a plasma display (PDP), or a projection projector.

Further, the camera is not limited to a black-and-white camera, and may be a color camera. The image of the magnified image may be imaged by zooming or moving the camera without depending on the defocusing method.

Furthermore, the definition of the luminance at the center of the image of the picture and the brightness of the peripheral portion are not limited to the above definition.

1‧‧‧luminance measuring device
2‧‧‧Organic EL panel (display panel)
3‧‧‧Control Department
4‧‧‧ Computing Department
5‧‧‧Memory Department
6‧‧‧ pattern generator
7‧‧‧ camera
8‧‧‧Photographing surface
9a~9p‧‧‧ pixels
10‧‧‧Revised data generating device
11‧‧‧ROM writer
12‧‧‧ROM (memory department)
13‧‧‧Quality adjustment circuit
14‧‧‧Quality-adjustable organic EL panel (image quality adjustment display panel)
D‧‧‧ points
P _A ‧‧‧ alignment pattern
I, I ₁ ~I ₉ ‧‧‧ Picture of the picture
X ₁ ~X ₉ ‧‧‧ Brightness
k ₅ ‧‧‧ Exposure factor at the center
k ₁ ~k ₄ , k ₆ ~k ₉ ‧‧‧ exposure coefficient of the peripheral part
S.1~S.29‧‧‧Steps

Fig. 1 is an explanatory view showing a luminance measuring apparatus according to a first embodiment. Fig. 2 is a flow chart showing a method of measuring the luminance of the first embodiment. Fig. 3 is an explanatory view showing a registration pattern. 4 is an explanatory view showing, in an enlarged manner, a pattern for measuring an exposure coefficient. FIG. 5 is an explanatory diagram showing an example of an image of a pixel on the imaging surface in the case of defocusing. FIG. 6 is an explanatory diagram showing an example of an image of a pixel on the imaging surface in the case of focusing. Fig. 7 is an explanatory view showing an example in which images of a plain cell are stacked on a photographing surface; Fig. 8 is an explanatory view showing a correction data generating device of the second embodiment. FIG. 9 is a flowchart showing a method of generating a correction data, a method of manufacturing an image quality adjustment type organic EL panel, and a method of adjusting an image quality according to the second embodiment.

1‧‧‧luminance measuring device

2‧‧‧Organic EL panel (display panel)

3‧‧‧Control Department

4‧‧‧ Computing Department

5‧‧‧Memory Department

6‧‧‧ pattern generator

7‧‧‧ camera

Claims (16)

A method for measuring luminance according to the present invention, comprising: a single-pictured photographing step of causing one or more pixel points of the display panel when photographing a pixel of the display panel by using a camera having a solid-state imaging element Illuminating and using the camera to take a picture, and on the shooting surface of the camera, the image of the picture element covers a plurality of pixels and the images of the picture elements are not overlapped with each other; the exposure coefficient calculation step is performed according to the single picture corresponding to the single picture The output of one or more pixels at the center of the image of the image captured in the photographing step, and calculating a central exposure coefficient indicating the ratio of the luminance of the central portion of the image of the pixel to the overall luminance of the image of the pixel And calculating, according to an output of one or more pixels corresponding to the peripheral portion of the image of the pixel, a peripheral exposure indicating a ratio of a peripheral luminance of the image of the pixel to an overall luminance of the image of the pixel Coefficient; all the steps of the photographing process, so that all the pixels of the display panel are illuminated, and the camera is used for photographing; and the luminance calculation step, according to the whole of the photographs The captured image in the photographing step, the center exposure coefficient and the peripheral exposure coefficient, and the luminance of all the pixels of the display panel are calculated. For example, the method for measuring the brightness of the first item of the patent application includes: a aligning step, using the camera to photograph a aligning pattern that illuminates a predetermined frame of the display panel, and detecting the aligning pattern The image of the camera is represented by which pixel of the camera is drawn, and the corresponding relationship between the pixel of the display panel and the pixel of the camera is obtained. For example, the method for measuring the brightness of the first or second application of the patent scope further includes: a step of enlarging the photographing, which is more magnified than the photographing step of the single-character photograph, and is used for calculating the central exposure coefficient and the The overall luminance of the image of the picture of the surrounding exposure coefficient. A luminance measuring apparatus, comprising: a control unit that controls lighting of a pixel of a display panel, and controls photographing by a camera having a solid-state imaging element; and an operation unit that is based on a photograph of the camera When the image is captured by the camera, the control unit lights one or more pixels of the display panel and captures the image with the camera, and the camera The image on the photographing surface causes the image of the pixel to cover a plurality of pixels and the images of the pixels are not overlapped with each other, and then the operation portion is based on one or more pixels corresponding to the central portion of the image of the photographed pixel Outputting, calculating a central exposure coefficient indicating a ratio of a central portion of the image of the pixel to the overall luminance of the image of the pixel, and one or more pixels according to a peripheral portion of the image corresponding to the image Output, calculating a peripheral exposure coefficient indicating a ratio of a peripheral luminance of the image of the pixel to the overall luminance of the image of the image, the control unit making the display panel All the pixels are illuminated and photographed by the camera. Then, the computing unit calculates the luminance of all the pixels of the display panel based on the captured image, the center exposure coefficient, and the peripheral exposure coefficient. The brightness measuring device of claim 4, wherein the control unit captures, by the camera, a registration pattern that lights a predetermined frame of the display panel, and the computing unit detects the The pixel of the alignment pattern is represented by which pixel of the camera, and the correspondence between the pixel of the display panel and the pixel of the camera is obtained. A brightness measuring device according to claim 4 or 5, wherein the output of the one or more pixels corresponding to the central portion of the image corresponding to the image is compared with the image corresponding to the pixel Shooting of the output of one or more pixels in the peripheral portion, the control unit further magnifies the pixel, and the computing unit calculates the overall luminance of the image of the pixel based on the captured image, and calculates the Center exposure factor and the peripheral exposure factor. A method for generating a correction data, comprising: a single-pictured photographing step of lighting and utilizing one or more pixels of the display panel when photographing a pixel of the display panel by using a camera having a solid-state imaging element The camera performs photographing, and on the photographing surface of the camera, the image of the picture element covers a plurality of pixels and the images of the pixels are not overlapped with each other; the exposure coefficient calculation step is performed according to the photographing step corresponding to the single picture Outputting the output of one or more pixels in the center of the image of the photographed image, and calculating a central exposure coefficient indicating the ratio of the central portion of the image of the image of the image to the overall luminance of the image of the pixel; and Corresponding to the output of one or more pixels of the peripheral portion of the image of the pixel, calculating a peripheral exposure coefficient indicating the ratio of the luminance of the peripheral portion of the image of the pixel to the overall luminance of the image of the pixel; a photographing step of photographing, so that all the pixels of the display panel are illuminated, and the camera is used for photographing; the luminance calculation step is based on the shots in the photographing steps of the entire photographed frame Taking the image, the center exposure coefficient and the peripheral exposure coefficient, calculating the luminance of all the pixels of the display panel; and correcting the data generating step, generating the display panel according to the luminance calculated in the luminance calculation step The input signal is corrected to reduce the correction data of the luminance unevenness of the display panel. For example, in the method for generating the correction data of the seventh aspect of the patent application, the method further includes: a aligning step, using the camera to capture a aligning pattern for lighting a predetermined frame of the display panel, and detecting the alignment The pixel of the image is represented by which pixel of the camera, thereby obtaining the correspondence between the pixel of the display panel and the pixel of the camera. For example, the method for generating the correction data of the seventh or eighth patent application scope includes: enlarging the photographing step, and zooming in on the photographing element to perform the photographing, thereby obtaining the central exposure coefficient and The overall luminance of the image of the picture of the peripheral exposure coefficient. A correction data generating apparatus, comprising: a control unit that controls lighting of a pixel of a display panel, and controls photographing by a camera having a solid-state imaging element; and an operation unit according to a photograph of the camera And performing a calculation; and a correction data generation unit that generates correction data for correcting an input signal of the display panel to reduce luminance unevenness of the display panel; and when photographing the pixel of the display panel by the camera The control unit illuminates one or more pixels of the display panel and performs photographing with the camera, so that the image of the pixel covers a plurality of pixels and the images of the plain images are opposite to each other on the photographing surface of the camera Do not overlap, and then the calculation unit calculates the luminance of the central portion of the image representing the pixel based on the output of one or more pixels corresponding to the central portion of the image of the captured pixel a central exposure coefficient of the ratio of the overall luminance, and a calculation table based on the output of one or more pixels corresponding to the peripheral portion of the image of the pixel a peripheral exposure coefficient indicating a ratio of a peripheral luminance of the image of the image to the overall luminance of the image of the image, and the control unit lights all the pixels of the display panel and photographs the image by using the camera. Then, the calculation unit calculates the luminance of all the pixels of the display panel based on the captured image, the central exposure coefficient, and the peripheral exposure coefficient, and the correction data generation unit is based on the luminance of all the pixels of the display panel. , the correction data is generated. The correction data generating device of claim 10, wherein the control unit captures, by the camera, a registration pattern that lights a predetermined image of the display panel, and the operation unit detects The pixel of the alignment pattern is represented by which pixel of the camera, and the correspondence between the pixel of the display panel and the pixel of the camera is obtained. The correction data generating device of claim 10 or 11, wherein the output of the one or more pixels corresponding to the central portion of the image corresponding to the image is corresponding to the pixel corresponding to the image The control unit captures the output of the one or more pixels in the peripheral portion, and the control unit further enlarges the image by the pixel, and the calculation unit calculates the overall luminance of the image of the pixel based on the captured image, and calculates The center exposure coefficient and the peripheral exposure coefficient. A method for manufacturing an image quality adjustment type display panel, comprising: a single-picture-preferred photographing step of causing one or more of the display panel when photographing a picture element of the display panel by using a camera having a solid-state imaging element The picture element is illuminated and photographed by the camera, and on the photographing surface of the camera, the image of the picture element covers a plurality of pixels and the images of the picture elements are not overlapped with each other; the exposure coefficient calculation step according to the corresponding Outputting one or more pixels in the central portion of the image of the pixel photographed in the single-picture photographing step, and calculating the overall luminance of the image of the image of the image of the image of the pixel a central exposure coefficient of the ratio; and calculating, based on an output of one or more pixels corresponding to the peripheral portion of the image of the pixel, an overall luminance of the peripheral portion of the image representing the pixel of the image Peripheral exposure factor of the ratio; all the photographing steps are performed, so that all the pixels of the display panel are illuminated, and the camera is used for photographing; the luminance calculation step is based on the full Calculating the brightness of all the pixels of the display panel in the photographing image in the photographing step, and the center exposure coefficient and the peripheral exposure coefficient; and correcting the data generating step according to the calculation in the luminance calculating step Brightness, generating correction data for correcting the input signal of the display panel to reduce luminance unevenness of the display panel; correcting the data memory step, storing the correction data in the memory portion of the image quality adjustment circuit; and installing steps The image quality adjustment circuit is mounted in the display panel such that the image quality adjustment circuit corrects the input signal based on the correction data. The method for manufacturing an image quality adjustment display panel according to claim 13, further comprising: a aligning step of photographing a aligning pattern for illuminating a predetermined image of the display panel by the camera, and Detecting which pixel of the camera is imaged by the image of the alignment pattern, thereby obtaining a correspondence between the pixel of the display panel and the pixel of the camera. For example, the method for manufacturing the image quality adjustment type display panel of claim 13 or 14 further includes: enlarging the photographing step, and zooming in on the photographed element to perform photographing, thereby obtaining for calculation The central exposure coefficient and the overall luminance of the image of the image of the peripheral exposure coefficient. An image quality adjustment type display panel, comprising: a display panel; and an image quality adjustment circuit, comprising: a memory unit that memorizes an input signal of the display panel to reduce display of the display panel Correcting data; and correcting data generated in the memory portion in such a manner that one or more of the display panels are photographed when the display panel is photographed using a camera having a solid-state imaging device The picture is illuminated and photographed by the camera, and the image of the plain object covers a plurality of pixels on the photographing surface of the camera, and the images of the plain cells do not overlap each other, and according to the corresponding picture element corresponding to the photograph. An output of one or more pixels at a central portion of the image, a central exposure coefficient calculating a ratio of a central portion of the image of the image of the image to the overall luminance of the image of the image, and corresponding to the pixel The output of one or more pixels in the peripheral portion of the image, and the ratio of the ratio of the peripheral luminance of the image of the pixel to the overall luminance of the image of the pixel is calculated. The light coefficient is such that all the pixels of the display panel are illuminated and captured by the camera, and the luminance of all the pixels of the display panel is calculated according to the captured image, the central exposure coefficient and the peripheral exposure coefficient, And the correction data is generated according to the luminance of all the pixels of the display panel.