JP2017090893A - Display device, correction method of display device, manufacturing method of display device, and displaying method of display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a correction method of a display device which can reduce correction data capacity and transfer rate while securing correction accuracy.SOLUTION: A correction method is provided of a display device 1 including pixels 400 arranged in matrix and each having an organic EL element 401 emitting light according to a brightness signal. The method includes: an acquisition step (S10) of acquiring in advance first correction data composed of a plurality of correction data components corresponding to the pixels 400 and for correcting a brightness signal; a conversion step of for the first correction data, propagating error components of correction data components corresponding to respective pixels to peripheral pixels of the respective pixels for reconfiguration (S20), and converting the error component into second correction data by bit-deleting the correction data components of the respective reconfigured pixels (S30); and a correction step (S60) of correcting the brightness signal using the second correction data.SELECTED DRAWING: Figure 6

Description

  The present disclosure relates to a display device, a display device correction method, a display device manufacturing method, and a display device display method.

  An organic EL display is known as a display device using a current-driven light emitting element. This organic EL display has attracted attention because it has the advantages of good viewing angle characteristics and low power consumption.

  In an organic EL display, usually, organic EL elements constituting pixels are arranged in a matrix. In particular, in an active matrix type organic EL display, the organic EL element can emit light until the next scanning (selection). Therefore, even if the duty ratio is increased, the luminance of the display is not reduced. Accordingly, since it can be driven at a low voltage, it is possible to reduce power consumption. However, in an active matrix organic EL display, the luminance of the organic EL element differs in each pixel even if the same luminance signal is given due to variations in characteristics of the drive transistor and the organic EL element, and so-called luminance unevenness occurs. There is a drawback of doing.

  As a method for correcting luminance unevenness in a conventional organic EL display, there has been proposed a method for correcting nonuniformity in characteristics of each pixel by correcting a luminance signal using correction data stored in a memory in advance.

  For example, in Patent Document 1, in a display panel having a plurality of pixels including an organic EL element and a drive transistor, representative current-voltage characteristics, luminance-current characteristics of each divided region, and luminance-voltage characteristics of each pixel are shown. A method for manufacturing an organic EL display device is disclosed in which correction data is obtained for each pixel so that the current-voltage characteristics of each pixel obtained from these are representative current-voltage characteristics. According to this, since highly accurate correction data is acquired, it is possible to improve luminance non-uniformity within the display panel surface and suppress variations in luminance deterioration due to lifetime.

International Publication No. 2011/118124

  However, in the organic EL display device disclosed in Patent Document 1, correction data (gain and offset) for each pixel calculated in advance is stored in the memory of the control circuit. For this reason, if the resolution of the display panel is increased while securing highly accurate correction data, the amount of correction data becomes enormous and the data transfer rate of the luminance signal and the like is compressed. In particular, the above-mentioned problem becomes serious in a tablet terminal or the like that is required to have a small size and high definition.

  The present invention has been made in view of the above problems, and a display device, a correction method for the display device, a method for manufacturing the display device, and a display in which the correction data capacity and the transfer rate are reduced while ensuring the accuracy of the correction. An object of the present invention is to provide a display method of an apparatus.

  In order to solve the above problems, a correction method for a display device according to one embodiment of the present invention corrects luminance unevenness of a display device in which pixels having light-emitting elements that emit light according to a luminance signal are arranged in a matrix. A correction method for a display device, comprising: an acquisition step for acquiring in advance a first correction data composed of a plurality of correction data components corresponding to the pixels, and correcting the luminance signal; and for each of the first correction data The error component of the correction data component corresponding to the pixel is reconstructed by propagating it to the peripheral pixels of each pixel, and the correction data component of each reconstructed pixel is converted into second correction data by reducing the number of bits. A conversion step; and a correction step of correcting the luminance signal using the second correction data.

  In addition, a method for manufacturing a display device according to one embodiment of the present invention is a method for manufacturing a display device in which pixels having light-emitting elements that emit light in accordance with a luminance signal are arranged in a matrix, in which a plurality of the pixels are arranged. A display panel forming step for forming the display panel, an acquisition step for acquiring in advance a first correction data composed of a plurality of correction data components corresponding to the pixels and correcting the luminance signal; Second correction data is obtained by propagating the error component of the correction data component corresponding to each pixel to the peripheral pixels of each pixel and reconfiguring the correction data, and reducing the correction data component of each of the reconfigured pixels by bits. A conversion step for converting the data into a memory, and a storage step for storing the second correction data in a memory of the display device after the conversion step. That.

  The display method for the display device according to one embodiment of the present invention is a display method for a display device in which pixels having light-emitting elements that emit light in accordance with a luminance signal are arranged in a matrix, and a plurality of pixels corresponding to the pixels. An acquisition step of acquiring first correction data for correcting the luminance signal in advance, and an error component of the correction data component corresponding to each pixel with respect to the first correction data. The second correction data acquired by the conversion step of propagating to the peripheral pixels of the pixel and reconstructing and converting the correction data component of each reconstructed pixel into the second correction data by reducing the bits. A correction step for correcting the luminance signal, and the luminance signal corrected in the correction step is supplied to the pixel, and the light emitting element is used in accordance with the luminance signal. Characterized in that it comprises a display step of displaying the display device by the light.

  The display device according to one embodiment of the present invention is a display device in which pixels having light-emitting elements that emit light in accordance with a luminance signal are arranged in a matrix, and includes a plurality of correction data components corresponding to the pixels. The first correction data for correcting the luminance signal is reconstructed by propagating the error component of the correction data component corresponding to each pixel to the peripheral pixels of each pixel, and reconstructing each of the reconstructed pixels. A conversion unit that converts the correction data component into second correction data by reducing the bits, and a correction unit that corrects the luminance signal using the second correction data.

  According to the display device, the display device correction method, the display device manufacturing method, or the display device display method according to the present invention, the error data of the correction data component is propagated to the peripheral pixels, and the correction data reduced in bits is used. Thus, the luminance signal is corrected, so that the correction data capacity and the transfer rate can be reduced while ensuring the correction accuracy.

1 is a block diagram illustrating a configuration of a display device according to Embodiment 1. FIG. FIG. 3 is a diagram illustrating an example of a circuit configuration of a pixel according to Embodiment 1 and connection with peripheral circuits. 3 is a block diagram illustrating a configuration of a control unit included in the display device according to Embodiment 1. FIG. It is a block diagram which shows the structure of the control part with which the conventional display apparatus is provided. It is a figure which compares the correction process of the display apparatus which concerns on Embodiment 1, and the conventional display apparatus, and its result. 3 is an operation flowchart illustrating a correction method for the display device according to the first embodiment. It is a block diagram of the measurement system for acquiring the 1st correction data. It is a block diagram which shows the structure of the information processing apparatus which acquires 2nd correction data in a manufacturing process. 10 is an operation flowchart illustrating a method for manufacturing a display device according to the second embodiment. It is a block diagram which shows the structure of the control part which displays a display apparatus using 2nd correction data. 12 is an operation flowchart illustrating a display method of the display device according to the third embodiment. It is an external view of the tablet terminal incorporating the display device according to any of Embodiments 1 to 3.

  Hereinafter, embodiments of a display device and a correction method thereof will be described with reference to the drawings. Note that each of the embodiments described below shows a preferred specific example in the present disclosure. Therefore, numerical values, shapes, materials, components, arrangement positions and connection forms of components, steps, and order of steps shown in the following embodiments are merely examples, and are not intended to limit the present invention. Absent. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept in the present invention are described as arbitrary constituent elements.

  Each figure is a schematic diagram and is not necessarily illustrated strictly. Moreover, in each figure, the same code | symbol is attached | subjected to the substantially same structure, The overlapping description is abbreviate | omitted or simplified.

(Embodiment 1)
[1.1 Configuration of display device]
FIG. 1 is a block diagram illustrating a configuration of the display device 1 according to the first embodiment. The display device 1 in the figure includes a control unit 10, a data line driving circuit 20, a scanning line driving circuit 30, and a display unit 40. The control unit 10 has a memory 11. Note that the memory 11 may be disposed outside the control unit 10 in the display device 1.

  The control unit 10 controls the memory 11, the data line driving circuit 20, and the scanning line driving circuit 30. For example, when the manufacturing process of the display device 1 is completed, the memory 11 stores correction data after processing (second correction data described later).

  During the display operation, the control unit 10 reads the second correction data written in the memory 11, corrects the video signal (luminance signal) input from the outside based on the second correction data, and the data line driving circuit. Output to 20.

  For example, when generating correction data before processing (first correction data described later) in the manufacturing process, the control unit 10 communicates with, for example, an external information processing apparatus, thereby The data line driving circuit 20 and the scanning line driving circuit 30 are driven in accordance with the instruction.

  In addition, the control unit 10 converts, for example, correction data (first correction data) before processing in the manufacturing process, generates correction data (second correction data) after processing, and sets the correction data after processing. Store in the memory 11.

  The display unit 40 includes a plurality of pixels 400 arranged in a matrix, and displays an image based on a video signal (luminance signal) input from the outside to the display device 1.

  FIG. 2 is a diagram illustrating an example of a circuit configuration of the pixel 400 according to Embodiment 1 and connection to peripheral circuits. A pixel 400 in the figure includes a scanning line 412, a data line 411, a power supply line 421, a selection transistor 403, a driving transistor 402, an organic EL element 401, a storage capacitor element 404, and a common electrode 422. . The peripheral circuit includes a data line driving circuit 20 and a scanning line driving circuit 30.

  The scanning line driving circuit 30 is connected to the scanning line 412 and controls conduction and non-conduction of the selection transistor 403 of the pixel 400.

  The data line driving circuit 20 is connected to the data line 411 and has a function of determining a signal current flowing in the driving transistor 402 by outputting a data voltage that is a luminance signal corrected using the second correction data. .

  The selection transistor 403 has a gate terminal connected to the scanning line 412 and controls the timing at which the data voltage of the data line 411 is supplied to the gate terminal of the driving transistor 402.

  The drive transistor 402 has a gate terminal connected to the data line 411 via the selection transistor 403, a source terminal connected to the anode terminal of the organic EL element 401, and a drain terminal connected to the power supply line 421. Thereby, the drive transistor 402 converts the data voltage supplied to the gate terminal into a signal current corresponding to the data voltage, and supplies the converted signal current to the organic EL element 401.

  The organic EL element 401 functions as a light emitting element, and the cathode terminal of the organic EL element 401 is connected to the common electrode 422.

  The storage capacitor element 404 is connected between the power supply line 421 and the gate terminal of the driving transistor 402. For example, the storage capacitor element 404 can maintain the previous gate voltage even after the selection transistor 403 is turned off, and can continuously supply the drive current from the drive transistor 402 to the organic EL element 401. .

  Although not shown in FIGS. 1 and 2, the power line 421 is connected to a power source. The common electrode 422 is also connected to the power source.

  The data voltage supplied from the data line driving circuit 20 is applied to the gate terminal of the driving transistor 402 via the selection transistor 403. The drive transistor 402 causes a current corresponding to the data voltage to flow between the source and drain terminals. When this current flows to the organic EL element 401, the organic EL element 401 emits light with light emission luminance corresponding to the current.

  Note that in the circuit configuration of the pixel 400 illustrated in FIG. 2, other circuit elements, wirings, and the like may be inserted between paths that connect the circuit elements.

[1.2 Configuration of control unit]
FIG. 3 is a block diagram illustrating a configuration of the control unit 10 included in the display device 1 according to the first embodiment. The control unit 10 shown in the figure includes a memory 11, a conversion unit 12, and a correction unit 13.

  The conversion unit 12 converts an error component generated when quantizing the correction data component corresponding to each pixel to the correction data component before the processing (first correction data) having the correction data component for each pixel. Reconstructed by propagating to the pixel, the correction data component of each reconstructed pixel is converted into second correction data with bits reduced.

  The correction unit 13 corrects the luminance signal using the second correction data. A luminance signal is an electrical signal applied to a pixel in order to cause a light emitting element included in the pixel to emit light. More specifically, in this embodiment mode, the luminance signal is a data voltage applied from the data line driver circuit 20 to the gate of the driving transistor 402 in order to cause the organic EL element 401 included in the pixel 400 to emit light. It is.

  Here, correction data (first correction data) before processing will be described. The first correction data is, for example, data for reducing luminance unevenness when each pixel 400 of the display unit 40 emits light based on a video signal transmitted from the outside to the display device 1. More specifically, the correction data includes, for example, two correction parameters, a gain correction value and an offset correction value, corresponding to the pixel 400. Note that the correction data may not correspond to the pixel 400, and may correspond to each pixel group that is an aggregate of a plurality of adjacent pixels.

  FIG. 4 is a block diagram illustrating a configuration of a control unit 500 included in a conventional display device. The conventional control unit 500 shown in the figure includes a memory 512 and a luminance signal correction unit 531. In the conventional display device, the control unit 500 stores the first correction data in the memory 512 in advance. The control unit 500 converts the video signal to generate a luminance signal (pre-correction luminance signal) for each pixel. The luminance signal correction unit 531 reads the first correction data from the memory 512, multiplies (or divides) the gain correction value of the first correction data by the luminance signal before correction, and the offset correction value of the first correction data. Is added (or subtracted) to correct the luminance signal before correction. The control unit 500 outputs the corrected luminance signal thus obtained to the data line driving circuit at a predetermined timing. Thereby, luminance unevenness in the display unit is reduced.

  In the above conventional display device, as the resolution of the display unit is increased, the amount of correction data to be stored in the memory 512 becomes enormous, and the data transfer rate of the luminance signal and the like increases and is compressed. Occur. In particular, it is difficult to secure a large-capacity memory in a tablet terminal that is required to have a small size and high definition, which leads to an increase in cost.

  On the other hand, in the display device 1 according to the present embodiment, the luminance signal is not corrected by the above-described first correction data (pre-processing correction data), but the pre-processing correction data (first correction data). ) Is corrected by the corrected data (second correction data) after processing acquired by performing the light processing. Hereinafter, in the display device 1 according to the present embodiment, a configuration for generating the second correction data from the first correction data will be described.

  The conversion unit 12 includes a threshold value determination unit 121 and a bit reduction unit 122, and propagates the error component of the correction data component of each pixel constituting the first correction data to the peripheral pixels of the pixel to perform the first correction. The correction data component of each pixel constituting the data is reconstructed, and the correction data component of the reconstructed first correction data is bit-reduced and converted to second correction data.

  The threshold value determination unit 121 determines a threshold value used when the subsequent bit reduction unit 122 performs bit reduction based on the distribution of a plurality of correction data components constituting the first correction data.

  The bit reduction unit 122 quantizes the correction data component of each pixel constituting the first correction data based on the threshold value determined by the threshold value determination unit 121, and converts the error component at that time to the peripheral pixels of each pixel. The correction data component of each pixel constituting the first correction data is reconstructed by propagation, and the correction data component of the reconstructed first correction data is bit-reduced to generate second correction data. More specifically, the bit reduction unit 122 converts the correction data component of each pixel constituting the first correction data based on the threshold value into a correction data component having a bit number smaller than the bit number of the correction data component. To reduce the bit.

  The bit reduction unit 122 binarizes the correction data component of the reconstructed first correction data based on the threshold value determined by the threshold value determination unit 121 ("0" or "1"). Also good. In this case, the correction data can be reduced in weight.

  As a quantization method for reconstructing the correction data component of each pixel constituting the first correction data by propagating the error component of the correction data component of each pixel constituting the first correction data to the peripheral pixels of each pixel. For example, an error diffusion method is used. In addition, as the above method, a dither method represented by a random dither method, a pattern dither method, or the like is applied. By using the error diffusion method as the processing in the bit reduction unit 122, it is possible to ensure the correction accuracy of the luminance signal.

  The memory 11 stores the second correction data generated by converting the first correction data by the conversion unit 12. Since the second correction data is obtained by reducing the number of bits of the first correction data, the second correction data has a smaller capacity than the first correction data. As the resolution of the display unit 40 increases, the effect of reducing the capacity of the memory 11 that stores the second correction data reduced in weight by the conversion unit 12 becomes significant. From the viewpoint of not requiring an excessively large capacity and long life as a recording medium, for example, a nonvolatile memory such as a flash memory can be applied as the memory 11.

  The correction unit 13 includes a data development unit 132 and a luminance signal correction unit 131.

  The data expansion unit 132 includes, for example, a volatile first memory such as a DRAM and an arithmetic circuit. The data expansion unit 132 reads the second correction data from the memory 11 and temporarily stores it in the first memory. Here, in the second memory exemplified in the SRAM provided in the first memory (or outside), the threshold value data determined by the threshold value determination unit 121 and the first correction data are quantized discrete values. At least one is saved. The arithmetic circuit uses the second correction data secured in the first memory as the number of bits of the second correction data stored in the memory 11 using at least one of the threshold data stored in the second memory and the discrete value. It may be developed into correction data (discrete value) having a larger number of bits. That is, the correction unit 13 develops the second correction data into data having a higher bit than the second correction data using at least one of the threshold data and the discrete value, and the bit is compared with the first correction data. The luminance signal is corrected using the compressed correction data. In the control unit 10 according to the present embodiment, the data development unit 132 is not an essential component.

  However, the higher the bit reduction rate of the first correction data in the bit reduction unit 122, the lower the correction accuracy of the second correction data. Therefore, when the bit reduction rate is high, the data development unit 132 may be provided. preferable.

  The luminance signal correction unit 131 corrects the luminance signal corresponding to the pixel 400 using the second correction data developed by the data development unit 132. Hereinafter, an example of luminance signal correction processing in the luminance signal correction unit 131 will be described.

  The luminance signal correction unit 131 multiplies (or divides) the gain correction value by the data voltage corresponding to the luminance signal before correction out of the second correction data (gain correction value, offset correction value), and performs offset correction on the multiplication value. The values are added (or subtracted) and output to the data line driving circuit 20. This makes it possible to reduce the correction data capacity and transfer rate while ensuring the accuracy of luminance correction.

  Here, specific processing of the conversion unit 12 will be described in detail with reference to FIG.

  FIG. 5 is a diagram for comparing the correction processing and the result between the display device 1 according to the first embodiment and the conventional display device. The display image shown on the left side of the figure is an example of an image when the entire display unit is caused to emit light with the same luminance and the display unit is displayed with a luminance signal without correction. On the other hand, the display image shown in the upper right part of FIG. 5 is an image when the display unit is displayed with the corrected luminance signal processed by the control unit 10 of the display device 1 according to the present embodiment. is there. The display image shown in the lower right part of FIG. 5 is an image when the display unit is displayed with the corrected luminance signal processed by the control unit 500 of the conventional display device.

  In addition, the display image by the display device 1 according to the present embodiment in FIG. 5 is corrected by using the second correction data generated by the conversion unit 12 through the error diffusion process and the bit reduction process. In the first correction data described in FIG. 5, for example, gain correction values (correction data components) for each pixel are represented in a matrix. In the display device 1 according to the present embodiment, the first correction data is subjected to error diffusion. Hereinafter, description will be made using correction data during error diffusion shown in FIG. For convenience of explanation, in FIG. 5, the correction data during error diffusion is represented as a 4 × 4 correction data component, and the correction data component is represented by (row, column). . For example, the upper left correction data component is represented as (1, 1), and the lower right correction data component is represented as (4, 4).

  First, as a pre-stage of error diffusion processing, the threshold value determination unit 121 determines a threshold value (= 1.012), a cutoff value (= 0.893), and a cutoff value from the distribution state of each correction data component of the first correction data. (= 1.130) is determined. Here, each of the cut-off value and the cut-up value is a discrete value obtained by quantizing the first correction data (its correction data component).

  Next, the bit reduction unit 122 compares the correction data component (1, 1) of the first correction data with the threshold (0.999 <1.012), and the correction data component (1, 1) after the error diffusion processing. ) Is replaced with the cut-off value (0.893) which is the discrete value. Then, the correction data component (1, 1) is quantized by setting the binarized data of the correction data component (1, 1) to “0”. Next, the bit reduction unit 122 determines a difference (error component) (0.106) between the pre-processing data (0.999) and the post-processing data (0.893) in the correction data component (1, 1) as a predetermined value. A value (1.052 = 1.0058 + 0.046) obtained by adding the distribution value (0.046 = 0.106 × 7/16) distributed by weighting to the correction data component (1, 2) of the first correction data. And the threshold are compared (1.052> 1.012). Based on this result, the corrected data component (1, 2) after the error diffusion processing is replaced with the round-up value (1.130) which is the discrete value. Then, the correction data component (1, 2) is quantized by setting the binarized data of the correction data component (1, 2) to “1”. Next, the bit reduction unit 122 distributes the difference (−0.124) between the pre-processing data (1.0058) and the post-processing data (1.130) in the correction data component (1, 2) with a predetermined weight. The distribution value (−0.054 = −0.124 × 7/16) is added to the correction data component (1, 3) of the first correction data (0.9714) and the threshold is compared ( 0.9714 <1.012). From this result, the correction data component (1, 3) after the error diffusion processing is replaced with the cut-off value (0.893) which is the discrete value, and the binarized data is set to “0”, thereby correcting the data component. Quantize (1, 3). Hereinafter, in the correction data during error diffusion in FIG. 5, the correction data component (1, 2) is diffused into the correction data components (2, 1), (2, 2), and (2, 3) of the peripheral pixels. Data up to this stage is shown. Thereafter, similarly, error correction processing is performed on all correction data components, thereby generating second correction data that is binarized (quantized) as shown in FIG. In the correction data during the error diffusion process in FIG. 5, the correction data components (1, 4), (2, 4), and (3, 1) to (4, 4) are represented by values before the diffusion process. Has been.

  As described above, the bit reduction unit 122 applies the error diffusion process, and based on the threshold value determined by the threshold value determination unit 121, the correction data component (1, 1, 1) of each pixel constituting the first correction data. ) To (4, 4) are quantized, the error component at that time is propagated to the peripheral pixels of each pixel, the correction data component of each pixel constituting the first correction data is reconfigured, and the reconfigured The second correction data is generated by bit reduction of the correction data component of the first correction data. In the above example, the bit reduction unit 122 performs bit reduction on the correction data component of each pixel constituting the first correction data based on the threshold value by binarization.

  Next, the data development unit 132 reads the binarized (quantized) second correction data, temporarily stores it in the first memory, and stores the second correction data as a threshold value (= 1.012) and a cutoff value. (= 0.893) and the round-up value (= 1.130) are used to develop the correction data (discrete value) having a bit number larger than the bit number of the second correction data. More specifically, as shown in the second correction data (after development) in FIG. 5, the data development unit 132 sets “0”, which is the second correction data component (1, 1), to a threshold (= 1.012) and the cut-off value (= 0.893) are used to develop the cut-off value (= 0.893). In addition, “1” that is the second correction data component (1, 2) is developed into a cut-up value (= 1.130) using a threshold value (= 1.012) and a cut-up value (= 1.130). To do.

  In this embodiment, the example in which the second correction data is reduced to 1 bit (“0” or “1”) is shown, but the present invention is not limited to this. When the second correction data is reduced to 2 bits or more, the data expansion unit 132 uses only either the threshold data or the discrete value obtained by quantizing the correction data component of the first correction data, You may expand | deploy to the correction data (discrete value) which has a bit number larger than the bit number of correction data.

  For example, when the second correction data is 3 bits, the threshold values are 0.910, 0.944, 0.978, 1.012, 1.045, 1.079, and 1.113, and the first correction data is The quantized discrete values (corresponding to the up and down values in the case of 2 bits) are 0.893 (“0”), 0.927 (“1”), 0.961 (“2”), 0 .995 (“3”), 1.028 (“4”), 1.062 (“5”), 1.096 (“6”), and 1.130 (“7”). In this case, the data expansion unit 132 reads each correction data component of the second correction data quantized to “0” to “7”, temporarily stores it in the first memory, and stores each correction data of the second correction data. The component can be expanded into a correction data component (discrete value) having a bit number (4 bits or more) larger than the bit number of the second correction data using only the seven threshold values. For example, when the correction data component (1, 1) of the second correction data is “2”, the developed correction data component (1, 1) is a discrete value between the threshold value 0.944 and the threshold value 0.978. Is determined and 0.961 (“2”) is calculated. When the correction data component (1, 2) of the second correction data is “0”, the developed correction data component (1, 2) takes a discrete value smaller than the threshold value 0.910 and is 0.910. 0.893 (“0”) is calculated by − (0.944−0.910) / 2 (subtract half of the threshold interval from 0.910).

  Further, the data development unit 132 reads each correction data component of the second correction data quantized to “0” to “7”, temporarily stores it in the first memory, and each correction data component of the second correction data. Can be expanded into a correction data component (discrete value) having a bit number (4 bits or more) larger than the bit number of the second correction data using only the seven discrete values. For example, when the correction data component (1, 1) of the second correction data is “1”, the developed correction data component (1, 1) is calculated to be the second largest 0.927 (“1”). The When the correction data component (1, 2) of the second correction data is “5”, the developed correction data component (1, 2) is calculated to be the sixth largest 1.062 (“5”). The

  Further, the data development unit 132 reads each correction data component of the second correction data quantized to “0” to “7”, temporarily stores it in the first memory, and each correction data component of the second correction data. Is expanded into correction data (discrete value) having a bit number (4 bits or more) larger than the bit number of the second correction data, using only the maximum value and the minimum value of the seven discrete values. Is possible. For example, it is possible to calculate the seven discrete values using the maximum value, the minimum value, and the number of bits (3 bits) of the second correction data. Thereby, for example, when the correction data component (1, 1) of the second correction data is “1”, the developed correction data component (1, 1) is the second largest 0.927 (“1”). Is calculated. When the correction data component (1, 2) of the second correction data is “5”, the developed correction data component (1, 2) is calculated to be the sixth largest 1.062 (“5”). The When calculating the seven discrete values using the maximum value, the minimum value, and the number of bits of the second correction data (3 bits), in addition to calculating the seven discrete values by an equal division, weighting is performed. It is also possible to use a given arrangement or a random arrangement.

  As shown in FIG. 5, the display images displayed by the luminance signal corrected by the control unit 10 of the present embodiment and the conventional control unit 500 are both uneven in luminance compared to the display image by the luminance signal without correction. It can be seen that is significantly reduced. However, the display image by the control unit 10 of the present embodiment and the display image by the conventional control unit 500 are different in the number of bits of correction data. That is, the second correction data whose bits have been reduced by the control unit 10 of the present embodiment has a smaller data capacity than the first correction data used in the conventional control unit 500. Therefore, according to the display device 1 according to the present embodiment, it is possible to reduce the correction data capacity and the transfer rate while ensuring the accuracy of luminance correction even when the number of pixels in the display unit is increased.

  In the display device 1 according to the present embodiment, the conversion unit 12 and the correction unit 13 may be realized as an IC or an LSI (Large Scale Integration) that is an integrated circuit. Further, the method of circuit integration may be realized by a dedicated circuit or a general-purpose processor. An FPGA (Field Programmable Gate Array) that can be programmed after manufacturing the LSI, or a reconfigurable processor that can reconfigure the connection and setting of circuit cells inside the LSI may be used. Further, if integrated circuit technology comes out to replace LSI's as a result of the advancement of semiconductor technology or a derivative other technology, it is naturally also possible to carry out function block integration using this technology. The conversion unit 12 and the correction unit 13 are realized as a program for executing the encoding process and the decoding process, or a computer-readable non-transitory recording medium on which the program is recorded, for example, a flexible disk, a hard disk, It can also be realized as a CD-ROM, MO, DVD, DVD-ROM, DVD-RAM, BD (Blu-ray (registered trademark) Disc), or semiconductor memory. Needless to say, such a program can be distributed via a recording medium such as a CD-ROM and a transmission medium such as the Internet.

[1.3 Display Device Correction Method]
Next, a correction method for the display device 1 according to the present embodiment will be described.

  FIG. 6 is an operation flowchart for explaining a correction method of the display device 1 according to the first embodiment. FIG. 6 shows a process until the control unit 10 of the display device 1 corrects the luminance signal with the second correction data. Hereinafter, the correction process will be described with reference to FIG.

  First, the control unit 10 previously acquires first correction data (correction data before processing) for correcting a luminance signal for causing the organic EL element 401 to emit light with a predetermined luminance (S10: acquisition step). As described above, the first correction data (correction data before processing) includes, for example, two correction parameters such as a gain correction value and an offset correction value corresponding to the pixel 400.

  Here, an example of a method for acquiring the first correction parameter will be described.

  FIG. 7 is a block diagram of a measurement system for acquiring the first correction data. The measurement system shown in the figure includes an information processing device 2, an imaging device 3, a display unit 40, and a control unit 10.

  The information processing apparatus 2 includes a calculation unit 201, a storage unit 202, and a communication unit 203, and has a function of controlling a process until the first correction parameter is generated. For example, a personal computer is applied as the information processing apparatus 2.

  The imaging device 3 captures the display unit 40 in accordance with a control signal from the communication unit 203 and outputs the captured image data to the communication unit 203. As the imaging apparatus 3, for example, a CCD camera or a luminance meter is applied.

  The information processing device 2 outputs a control signal to the control unit 10 and the imaging device 3 of the display device 1 via the communication unit 203, acquires measurement data from the control unit 10 and the imaging device 3, and stores the measurement data in the storage unit 202, and the operation unit 201 calculates various characteristic values and parameters based on the stored measurement data. The control unit 10 may use a control circuit that is not built in the display device 1.

  Specifically, the information processing device 2 controls the voltage value applied to the measurement pixel. The control unit 10 applies the voltage value to the measurement pixel and causes the measurement pixel to emit light. The imaging device 3 measures the luminance value of the measurement pixel that has emitted light. The information processing device 2 receives the voltage value and the measured luminance value. The information processing device 2 changes the voltage value applied to the measurement pixel, performs similar control, and receives a different voltage value and a measured luminance value corresponding to the voltage value. When the information processing apparatus 2 repeats this, the calculation unit 201 calculates a voltage-luminance characteristic for each measurement pixel, compares the voltage-luminance characteristic with a reference voltage-luminance characteristic, and determines each measurement pixel. Correction parameters (gain correction value and offset correction value) are calculated.

  The control unit 10 receives the correction parameter calculated by the calculation unit 201 as first correction data via the communication unit 203.

  Through the above steps, the control unit 10 acquires first correction data for correcting the luminance signal in advance.

  Next, the control unit 10 quantizes the correction data component corresponding to each pixel with respect to the first correction data, and propagates the error component at that time to the peripheral pixels of each pixel to reconfigure (S20).

  Next, the control unit 10 converts the correction data component of each reconstructed pixel into second correction data by bit reduction (S30). Steps S20 and S30 are conversion steps performed by the conversion unit 12 of the control unit 10.

  Next, the control unit 10 stores the second correction data in advance in the memory 11 included in the display device 1 (S40: storage step).

  Next, the control unit 10 reads the second correction data from the memory 11, and uses the threshold value that is the reference value for bit reduction in step S30, to the correction data having a bit number larger than the bit number of the second correction data. (S50).

  In addition, the said expansion | deployment process in step S50 is not an essential process. However, the higher the bit reduction rate of the first correction data in step S30, the lower the correction accuracy of the second correction data. Therefore, when the bit reduction rate is high, it is preferable to perform the above expansion process.

  Next, the control unit 10 corrects the luminance signal using the second correction data (S60: correction step).

  According to the correction method of display device 1 according to the above-described embodiment, the luminance signal is not corrected by the first correction data (correction data before processing), but the processing in steps S20 and S30 is performed. The luminance signal is corrected by the second correction data. The memory 11 stores second correction data generated by converting the first correction data. Since the second correction data is obtained by reducing the number of bits of the first correction data, the second correction data has a smaller capacity than the first correction data. As a result, as the resolution of the display unit 40 increases, the effect of reducing the capacity of the memory 11 that stores the lightened second correction data becomes significant. Therefore, it is possible to reduce the correction data capacity and the transfer rate while ensuring the accuracy of luminance correction.

  In step S20, an error diffusion method may be used as a method for reconstructing the first correction data by propagating the correction data component corresponding to each pixel to the surrounding pixels of each pixel. By using the error diffusion method, it is possible to ensure the correction accuracy of the luminance signal. In addition to the error diffusion method, for example, a dither method represented by a random dither method and a pattern dither method may be applied.

  Further, when the first correction data is reconstructed by propagating the error component of the correction data component corresponding to each pixel to the peripheral pixels of each pixel, it is determined by the distribution state of the correction data component constituting the first correction data. The correction data component may be quantized based on the threshold value, and the correction data component may be reconstructed using the error component at that time.

  In step S30, the correction data component of each pixel reconstructed by propagating the error component of the correction data component corresponding to each pixel in the first correction data to the peripheral pixels of each pixel is binarized. Bit reduction may be possible. In this case, it is possible to reduce the weight of the second correction data.

(Embodiment 2)
In the first embodiment, the correction method of the display device 1 until the first correction data is acquired, the second correction data is generated from the first correction data, and the luminance signal is corrected with the second correction data has been described. . On the other hand, in the present embodiment, a method for manufacturing the display device 1 until the second correction data is generated from the first correction data and the second correction data is stored in the memory 11 of the display device 1 will be described. To do. That is, in the manufacturing method of the display device 1 according to the present embodiment, the correction method of the display device 1 according to the first embodiment includes a process until the luminance signal is corrected with the second correction data. The difference is that it includes a process until the second correction data is stored in the memory 11. Hereinafter, the description of the same configuration as the display device 1 and the correction method thereof according to the first embodiment will be omitted, and the description will be focused on the different points.

[2.1 Configuration of information processing apparatus in manufacturing process]
FIG. 8 is a block diagram showing a configuration of the information processing apparatus 2A that acquires the second correction data in the manufacturing process. The information processing apparatus 2A shown in the figure is used in the manufacturing process of the display apparatus 1 and includes a conversion unit 12A.

  The conversion unit 12A includes a threshold value determination unit 121A and a bit reduction unit 122A, and propagates the error component of the correction data component of each pixel constituting the first correction data to the surrounding pixels of the pixel to perform the first correction. The correction data component of each pixel constituting the data is reconstructed, and the correction data component of the reconstructed first correction data is bit-reduced and converted to second correction data.

  Based on the distribution of the plurality of correction data components constituting the first correction data, the threshold value determination unit 121A determines a threshold value used when bit reduction is performed by the subsequent bit reduction unit 122A.

  The bit reduction unit 122A quantizes the correction data component of each pixel constituting the first correction data based on the threshold value determined by the threshold value determination unit 121A, and converts the error component at that time to the surrounding pixels of each pixel. The correction data component of each pixel constituting the first correction data is reconstructed by propagation, and the correction data component of the reconstructed first correction data is bit-reduced to generate second correction data. More specifically, the bit reduction unit 122A determines, based on the threshold value, the correction data component of each pixel constituting the first correction data, the correction data component having a bit number smaller than the bit number of the correction data component. To reduce the bit.

  The bit reduction unit 122A binarizes the correction data component of the reconstructed first correction data based on the threshold value determined by the threshold value determination unit 121A (“0” or “1”). Also good. In this case, the correction data can be reduced in weight.

  As a quantization method for reconstructing the correction data component of each pixel constituting the first correction data by propagating the error component of the correction data component of each pixel constituting the first correction data to the peripheral pixels of each pixel. For example, an error diffusion method is used. In addition, as the above method, a dither method represented by a random dither method, a pattern dither method, or the like is applied. By using the error diffusion method as the processing in the bit reduction unit 122, it is possible to ensure the correction accuracy of the luminance signal.

  The first correction data may be acquired by the information processing device 2 shown in FIG. 7 of the first embodiment. At this time, the information processing device 2 according to the first embodiment and the information processing device 2A according to the present embodiment may be the same device and have both functions. That is, the information processing apparatus 2A according to the present embodiment may include the calculation unit 201, the storage unit 202, and the communication unit 203 in addition to the conversion unit 12A. The first correction data may be given to the information processing apparatus 2A in advance.

[2.2 Manufacturing method of display device]
FIG. 9 is an operation flowchart illustrating a method for manufacturing the display device 1 according to the second embodiment. FIG. 9 shows from the process of forming the display panel of the display device 1 to the process of storing the second correction data in the memory. Hereinafter, the manufacturing process will be described with reference to FIG.

  First, a display panel constituting the display device 1 is formed (S100: display panel forming step). Hereinafter, a process for forming a display panel will be exemplified. For example, a planarization film made of an insulating organic material is formed over a substrate including circuit elements such as TFTs, and then an anode is formed over the planarization film. Next, for example, a hole injection layer is formed on the anode. Next, a light emitting layer is formed on the hole injection layer. Next, an electron injection layer is formed on the light emitting layer. Subsequently, a cathode is formed on the substrate on which the electron injection layer is formed. By these steps, an organic EL element having a function as a light emitting element is formed. Further, a thin film sealing layer is formed on the cathode. Next, a sealing resin layer is applied to the surface of the thin film sealing layer. Thereafter, a color filter is formed on the applied sealing resin layer. Next, an adhesive layer and a transparent substrate are disposed on the color filter. Note that the thin film sealing layer, the sealing resin layer, the adhesive layer, and the transparent substrate correspond to a protective layer. Finally, heat or energy rays are applied while pressing the transparent substrate downward from the upper surface side to cure the sealing resin layer, and the transparent substrate, the adhesive layer, the color filter, and the thin film sealing layer are bonded. A display panel is formed by the formation process.

  Next, the information processing apparatus 2A acquires in advance first correction data (correction data before processing) for correcting a luminance signal for causing the organic EL element 401 to emit light with a predetermined luminance (S110: acquisition step). . As described above, the first correction data (correction data before processing) includes, for example, two correction parameters such as a gain correction value and an offset correction value corresponding to the pixel 400. The method for acquiring the first correction parameter may be acquired by the information processing apparatus 2 described in FIG. 7 of the first embodiment, or, for example, the first correction parameter of the display panel manufactured in the same batch is used. You may divert.

  Next, the information processing apparatus 2A quantizes the correction data component corresponding to each pixel with respect to the first correction data, and propagates the error component at that time to the peripheral pixels of each pixel to reconfigure (S120).

  Next, the information processing apparatus 2A converts the reconstructed correction data component of each pixel into second correction data by bit reduction (S130). Steps S120 and S130 are conversion steps performed by the conversion unit 12A of the information processing apparatus 2A.

  Next, the information processing apparatus 2A stores in advance the second correction data in the memory 11 included in the display apparatus 1 (S140: storage step).

  According to the correction method of display device 1 according to the present embodiment described above, the first correction data (correction data before processing) is not stored in memory 11, but the processing in steps S 120 and S 130 is performed. The second correction data is stored in the memory 11. Since the second correction data is obtained by reducing the number of bits of the first correction data, the second correction data has a smaller capacity than the first correction data. As a result, as the resolution of the display unit 40 increases, the effect of reducing the capacity of the memory 11 that stores the lightened second correction data becomes significant. Therefore, it is possible to reduce the correction data capacity and the transfer rate while ensuring the accuracy of luminance correction.

  In step S120, an error diffusion method may be used as a method for reconstructing the first correction data by propagating the correction data component corresponding to each pixel to the peripheral pixels of each pixel. By using the error diffusion method, it is possible to ensure the correction accuracy of the luminance signal. In addition to the error diffusion method, for example, a dither method represented by a random dither method and a pattern dither method may be applied.

  Further, when the first correction data is reconstructed by propagating the error component of the correction data component corresponding to each pixel to the peripheral pixels of each pixel, it is determined by the distribution state of the correction data component constituting the first correction data. The correction data component may be quantized based on the threshold value, and the correction data component may be reconstructed using the error component at that time.

  Further, in step S130, the correction data component of each pixel reconstructed by propagating the error component of the correction data component corresponding to each pixel in the first correction data to the peripheral pixels of each pixel is binarized. Bit reduction may be possible. In this case, it is possible to reduce the weight of the second correction data.

  Further, the information processing apparatus 2A may be built in the control unit 10 constituting the display device 1, and the control unit 10 may acquire the second correction data and store it in the memory 11 in the manufacturing process.

(Embodiment 3)
In the first embodiment, the correction method of the display device 1 until the first correction data is acquired, the second correction data is generated from the first correction data, and the luminance signal is corrected with the second correction data has been described. . On the other hand, in the present embodiment, the display method of the display device 1 until the second correction data is read, the luminance signal is corrected by the second correction data, and the pixel display is performed by the corrected luminance signal. explain. That is, the manufacturing method of the display device 1 according to the present embodiment includes the process until the second correction data is stored in the memory 11 in the manufacturing method of the display device 1 according to the second embodiment. The difference is that it includes from the step of reading the stored second correction data to the step of displaying pixels. Hereinafter, the description of the same configuration as the display device 1 and the correction method thereof according to the first embodiment will be omitted, and the description will be focused on the different points.

[3.1 Configuration of control unit]
FIG. 10 is a block diagram illustrating a configuration of the control unit 10 that displays the display device 1 using the second correction data. The control unit 10 shown in the figure includes a memory 11 and a correction unit 13.

  The correction unit 13 corrects the luminance signal using the second correction data. A luminance signal is an electrical signal applied to a pixel in order to cause a light emitting element included in the pixel to emit light. More specifically, in this embodiment mode, the luminance signal is a data voltage applied from the data line driver circuit 20 to the gate of the driving transistor 402 in order to cause the organic EL element 401 included in the pixel 400 to emit light. It is.

  Here, in the display method according to the present embodiment, the luminance signal is not corrected by the first correction data (pre-processing correction data) described above, but the correction data (first correction data) before processing is lightweight. The luminance signal is corrected by the corrected data (second correction data) after processing acquired by processing. Since the second correction data is obtained by reducing the number of bits of the first correction data, the second correction data has a smaller capacity than the first correction data.

  Thereby, as the resolution of the display unit 40 increases, the effect of reducing the capacity of the memory 11 that stores the second correction data that is lighter than the first correction data becomes significant. From the viewpoint of not requiring an excessively large capacity and long life as a recording medium, for example, a nonvolatile memory such as a flash memory can be applied as the memory 11.

  The correction unit 13 includes a data development unit 132 and a luminance signal correction unit 131.

  The data expansion unit 132 includes, for example, a volatile first memory such as a DRAM and an arithmetic circuit. The data expansion unit 132 reads the second correction data from the memory 11 and temporarily stores it in the first memory. Here, in the second memory exemplified in the SRAM provided in the first memory (or outside), the threshold value data determined by the threshold value determination unit 121 and the first correction data are quantized discrete values. At least one is saved. The arithmetic circuit uses the second correction data secured in the first memory as the number of bits of the second correction data stored in the memory 11 using at least one of the threshold data stored in the second memory and the discrete value. It may be developed into correction data (discrete value) having a larger number of bits. That is, the correction unit 13 develops the second correction data into data having a higher bit than the second correction data using at least one of the threshold data and the discrete value, and the bit is compared with the first correction data. The luminance signal is corrected using the compressed correction data. In the control unit 10 according to the present embodiment, the data development unit 132 is not an essential component.

  However, the higher the bit reduction rate of the first correction data, the lower the correction accuracy of the second correction data. Therefore, when the bit reduction rate is high, it is preferable to provide the data expansion unit 132.

  The luminance signal correction unit 131 corrects the luminance signal corresponding to the pixel 400 using the second correction data developed by the data development unit 132. Hereinafter, an example of luminance signal correction processing in the luminance signal correction unit 131 will be described.

  The luminance signal correction unit 131 multiplies (or divides) the gain correction value by the data voltage corresponding to the luminance signal before correction out of the second correction data (gain correction value, offset correction value), and performs offset correction on the multiplication value. The values are added (or subtracted) and output to the data line driving circuit 20. This makes it possible to reduce the correction data capacity and transfer rate while ensuring the accuracy of luminance correction.

[3.2 Display Method of Display Device]
FIG. 11 is an operation flowchart for explaining a display method of the display device 1 according to the third embodiment. FIG. 11 shows a process from the process of reading the second correction data to the process of correcting the luminance signal and displaying the pixel by the control unit 10 of the display device 1. Hereinafter, the correction process will be described with reference to FIG.

  First, the control unit 10 reads the second correction data from the memory 11 and uses at least one of a threshold value used as a reference value for bit reduction and a discrete value obtained by quantizing the first correction data to generate a bit of the second correction data. The data is developed into correction data having a larger number of bits than the number (S250).

  In addition, the said expansion | deployment process in step S250 is not an essential process. However, the higher the bit reduction rate of the first correction data, the lower the correction accuracy of the second correction data. Therefore, when the bit reduction rate is high, it is preferable to perform the above expansion process.

  Next, the control unit 10 corrects the luminance signal using the second correction data (S260: correction step).

  Finally, the control unit 10 supplies the luminance signal corrected in the correction step to each pixel 400, and displays the display device 1 by causing the organic EL element 401 to emit light according to the luminance signal (S270: display). Step).

  According to the display method of the display device 1 according to the above-described embodiment, the luminance signal is not corrected by the first correction data (correction data before processing), but the luminance is corrected by the second correction data reduced in bits. The signal is corrected. The memory 11 stores second correction data generated by converting the first correction data. Since the second correction data is obtained by reducing the number of bits of the first correction data, the second correction data has a smaller capacity than the first correction data. As a result, as the resolution of the display unit 40 increases, the effect of reducing the capacity of the memory 11 that stores the lightened second correction data becomes significant. Therefore, it is possible to reduce the correction data capacity and the transfer rate while ensuring the accuracy of luminance correction.

(Other embodiments)
Although the first to third embodiments have been described above, the display device 1, the correction method for the display device 1, the manufacturing method for the display device 1, and the display method for the display device according to the above embodiments are described above. It is not limited to. Modifications obtained by making various modifications conceivable by those skilled in the art within the scope of the present invention without departing from the spirit of the present invention, and various devices incorporating the display device 1 according to the present invention are also included in the present invention. .

  For example, the display device 1, the correction method of the display device 1, the manufacturing method of the display device 1, and the display method of the display device according to the first to third embodiments are applied to a tablet terminal as illustrated in FIG. . The display device, the correction method of the display device 1, the manufacturing method of the display device 1, and the display method of the display device according to the present invention realize a low-cost small and high-definition tablet terminal including a display in which uneven luminance is suppressed. Is done.

  In the above embodiment, the case where an image is displayed on the display unit 40 by the luminance signal generated based on the external video signal is illustrated, but the present invention is not limited thereto. A luminance signal for causing a pixel to emit light is generated not only by an external video signal but also by various signals for displaying a still image or a moving image.

  The first correction data is not limited to being generated when the display device 1 is manufactured. The second correction data is not limited to being stored in the memory 11 when the display device 1 is manufactured. Even after the display device 1 is manufactured and during the display operation or the non-display operation, the first correction data is updated, and the second correction data is updated and stored based on the updated first correction data. May be.

  Further, the light-emitting element included in each pixel is not limited to the organic EL element, and may be a light-emitting element made of a current-driven or voltage-driven inorganic material.

  INDUSTRIAL APPLICABILITY The present invention is particularly useful for an organic EL flat panel display incorporating a display device using an organic EL element, and is used as a display device for a small and high-definition display that requires uniformity in image quality and a correction method thereof. Is optimal.

DESCRIPTION OF SYMBOLS 1 Display apparatus 2, 2A Information processing apparatus 3 Imaging apparatus 10, 500 Control part 11, 512 Memory 12, 12A Conversion part 13 Correction part 20 Data line drive circuit 30 Scan line drive circuit 40 Display part 121, 121A Threshold value determination part 122, 122A Bit reduction unit 131, 531 Luminance signal correction unit 132 Data development unit 201 Operation unit 202 Storage unit 203 Communication unit 400 Pixel 401 Organic EL element 402 Drive transistor 403 Selection transistor 404 Retention capacitance element 411 Data line 412 Scan line 421 Power supply line 422 Common electrode

Claims (16)

A correction method for a display device that corrects luminance unevenness of a display device in which pixels having light emitting elements that emit light according to a luminance signal are arranged in a matrix,
An acquisition step of acquiring in advance a first correction data for correcting the luminance signal, which is composed of a plurality of correction data components corresponding to the pixels;
The first correction data is reconstructed by propagating the error component of the correction data component corresponding to each pixel to the peripheral pixels of the pixel, and the number of correction data components of the reconstructed pixel is reduced by bits. A conversion step for converting into two correction data;
And a correction step of correcting the luminance signal using the second correction data. further,
After the conversion step, including a storage step of storing the second correction data in advance in a memory included in the display device,
The correction method for a display device according to claim 1, wherein in the correction step, the second correction data stored in the memory is read and the luminance signal is corrected using the second correction data. 2. In the conversion step, the plurality of correction data components constituting the first correction data are subjected to error diffusion, and the plurality of correction data components subjected to the error diffusion are bit-reduced and converted into second correction data. Or the correction method of the display apparatus of 2. In the conversion step, the plurality of correction data components constituting the first correction data are propagated to surrounding pixels based on pre-calculated threshold data,
In the correction step, each of the plurality of correction data components constituting the second correction data is converted into the second correction data using at least one of the threshold data and a discrete value obtained by quantizing the first correction data. The correction method for the display device according to claim 3, wherein the data is developed into data of a higher bit and the luminance signal is corrected using the developed second correction data. In the conversion step, the correction data component of each pixel reconstructed by propagating the correction data component corresponding to each pixel of the first correction data to the peripheral pixels of the pixel, and binarizing the second correction data The display device correction method according to claim 1, wherein the display device correction method is used. A method of manufacturing a display device in which pixels having light emitting elements that emit light according to a luminance signal are arranged in a matrix,
A display panel forming step of forming a display panel in which a plurality of the pixels are arranged;
An acquisition step of acquiring in advance a first correction data for correcting the luminance signal, which is composed of a plurality of correction data components corresponding to the pixels;
The first correction data is reconstructed by propagating the error component of the correction data component corresponding to each pixel to the peripheral pixels of the pixel, and the number of correction data components of the reconstructed pixel is reduced by bits. A conversion step for converting into two correction data;
A method for manufacturing a display device, comprising: a storage step of storing the second correction data in a memory included in the display device after the conversion step. 7. In the conversion step, the plurality of correction data components constituting the first correction data are subjected to error diffusion, and the plurality of correction data components subjected to the error diffusion are bit-reduced and converted into second correction data. The manufacturing method of the display apparatus as described in any one of. In the conversion step, the correction data component of each pixel reconstructed by propagating the correction data component corresponding to each pixel of the first correction data to the peripheral pixels of the pixel, and binarizing the second correction data The manufacturing method of the display device according to claim 6 or 7. A display method of a display device in which pixels having light-emitting elements that emit light according to a luminance signal are arranged in a matrix,
An acquisition step of acquiring in advance first correction data for correcting the luminance signal, and a correction data component corresponding to each pixel with respect to the first correction data; The error component is propagated to the surrounding pixels of each pixel and reconstructed, and the correction data component of each reconstructed pixel is obtained by a conversion step that converts it into second correction data by reducing the number of bits. A correction step of correcting the luminance signal using the second correction data;
A display method of a display device, comprising: a display step of displaying the display device by supplying the luminance signal corrected in the correction step to the pixel and causing the light emitting element to emit light according to the luminance signal. 10. In the conversion step, the plurality of correction data components constituting the first correction data are subjected to error diffusion, and the plurality of correction data components subjected to the error diffusion are bit-reduced and converted into second correction data. The display method of the display apparatus as described in 2. In the conversion step, the plurality of correction data components constituting the first correction data are propagated to surrounding pixels based on pre-calculated threshold data,
In the correction step, each of the plurality of correction data components constituting the second correction data is converted into the second correction data using at least one of the threshold data and a discrete value obtained by quantizing the first correction data. The display device display method according to claim 10, wherein the display device further expands the data into higher-bit data and corrects the luminance signal using the expanded second correction data. In the conversion step, the correction data component of each pixel reconstructed by propagating the correction data component corresponding to each pixel of the first correction data to the peripheral pixels of the pixel, and binarizing the second correction data The display method of the display device according to claim 9, wherein the display device is converted into a display device. A display device in which pixels having light emitting elements that emit light in response to a luminance signal are arranged in a matrix,
The first correction data for correcting the luminance signal is propagated to the peripheral pixels of each pixel, the first correction data for correcting the luminance signal is composed of a plurality of correction data components corresponding to the pixel. A conversion unit that reconstructs and converts the correction data component of each reconstructed pixel into second correction data by bit reduction;
And a correction unit that corrects the luminance signal using the second correction data. further,
A memory for storing the second correction data;
The display device according to claim 13, wherein the correction unit reads the second correction data stored in the memory, and corrects the luminance signal using the second correction data. The display device according to claim 13, wherein the conversion unit performs error diffusion on the first correction data and reduces a bit of a correction data component of each pixel subjected to the error diffusion. The conversion unit propagates an error component generated when quantizing a correction data component corresponding to each pixel with respect to the first correction data to the surrounding pixels of each pixel, and reconstructed correction data for each pixel The display device according to claim 13, wherein the component is binarized.

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