CN106847185B

CN106847185B - Display device, correction method of display device, manufacturing method of display device, and display method

Info

Publication number: CN106847185B
Application number: CN201610987309.3A
Authority: CN
Inventors: 土田臣弥
Original assignee: Joled Inc
Current assignee: Japan Display Design And Development Contract Society
Priority date: 2015-11-11
Filing date: 2016-11-10
Publication date: 2020-10-23
Anticipated expiration: 2036-11-10
Also published as: TW201729177A; KR101964500B1; KR20170055433A; JP6744791B2; CN106847185A; JP2017090893A; TWI717414B

Abstract

Provided are a display device, a display device calibration method, a display device manufacturing method, and a display method, wherein the calibration accuracy can be ensured and the calibration data capacity and transmission rate can be reduced. A method for correcting a display device (1) in which pixels (400) having organic EL elements (401) that emit light in accordance with a luminance signal are arranged in a matrix, comprising: an obtaining step (S10) of obtaining in advance first correction data for correcting a luminance signal, the first correction data being composed of a plurality of correction data components corresponding to pixels; a conversion step (S30) for converting the first correction data into second correction data by propagating the error component of the correction data component corresponding to each pixel to the peripheral pixels of each pixel and reconstructing the error component (S20), and bit-reducing the correction data component of each pixel to be reconstructed; and a correction step (S60) of correcting the luminance signal using the second correction data.

Description

Display device, correction method of display device, manufacturing method of display device, and display method

Technical Field

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

Background

As a display device using a current-driven light-emitting element, an organic EL display is known. Such an organic EL display has been drawing attention because it has advantages of good viewing angle characteristics and low power consumption.

In an organic EL display, organic EL elements constituting pixels are generally arranged in a matrix. In particular, in an active matrix organic EL display, since the organic EL element can be caused to emit light until the next scanning (selection), the luminance of the display is not lowered even if the duty ratio is increased. In this way, driving can be performed at a low voltage, and low power consumption can be achieved. However, in the active matrix organic EL display, there is a disadvantage that the luminance of the organic EL element in each pixel differs, that is, luminance unevenness occurs, even if the same luminance signal is given, because the characteristics of the driving transistor and the organic EL element are different from each other.

As a conventional method of correcting luminance unevenness in an organic EL display, there is a method of correcting a luminance signal using correction data stored in advance in a memory to compensate for unevenness in characteristics of each pixel.

For example, patent document 1 discloses a method for manufacturing an organic EL display device, in which a representative current-voltage characteristic, a luminance-current characteristic of each divided region, and a luminance-voltage characteristic of each pixel are obtained in a display panel having a plurality of pixels including organic EL elements and drive transistors, and correction data capable of making the current-voltage characteristic of each pixel obtained as described above the representative current-voltage characteristic is obtained for each pixel. Accordingly, since highly accurate correction data can be obtained, it is possible to improve luminance nonuniformity in the display panel surface and suppress luminance degradation nonuniformity due to lifetime.

Documents of the prior art

Patent document

Patent document 1 International publication No. 2011/118124

However, in the organic EL display device disclosed in patent document 1, the correction data (gain and offset) of each pixel calculated in advance is stored in the memory of the control circuit. Therefore, if the resolution of the display panel is increased while securing high-precision correction data, the amount of correction data becomes enormous, and the data transfer rate such as a luminance signal is compressed. In particular, the above-described problems are more significant in tablet personal computer terminals and the like, which are required to be small and highly precise.

Disclosure of Invention

In view of the above-described problems, it is an object of the present invention to provide a display device, a correction method for the display device, a method for manufacturing the display device, and a display method for the display device, in which the correction data capacity and the transmission rate can be reduced while ensuring the accuracy of correction.

In order to solve the above-described problems, a correction method of a display device according to an aspect of the present invention is a correction method of a display device in which pixels having light emitting elements that emit light in accordance with a luminance signal are arranged in a matrix, the correction method including: an obtaining step of obtaining first correction data in advance, the first correction data being composed of a plurality of correction data components corresponding to the pixels and used for correcting the luminance signal; a conversion step of converting the first correction data into second correction data by propagating error components of correction data components corresponding to the respective pixels to peripheral pixels of the respective pixels and reconstructing the error components, and bit-reducing the correction data components of the reconstructed respective pixels; and a correction step of correcting the luminance signal using the second correction data.

In addition, a method of manufacturing a display device according to an aspect of the present invention is a method of 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, the method including: a display panel forming step of forming a display panel in which a plurality of the pixels are arranged; an obtaining step of obtaining first correction data in advance, the first correction data being composed of a plurality of correction data components corresponding to the pixels and used for correcting the luminance signal; a conversion step of converting the first correction data into second correction data by propagating error components of correction data components corresponding to the respective pixels to peripheral pixels of the respective pixels and reconstructing the error components, and bit-reducing the correction data components of the reconstructed respective pixels; and a saving step of saving the second correction data in a memory provided in the display device after the converting step.

In addition, a display method of a display device according to an aspect of the present invention is a display method of a display device in which pixels having light emitting elements that emit light in accordance with a luminance signal are arranged in a matrix, the display method including: a correction step of correcting the luminance signal using second correction data obtained by the obtaining step of obtaining first correction data in advance, the first correction data being composed of a plurality of correction data components corresponding to the pixels and used for correcting the luminance signal, and the conversion step of reconstructing an error component of a correction data component corresponding to each pixel by propagating the error component to a peripheral pixel of the pixel, and converting the first correction data into second correction data by bit-reducing the correction data component of the reconstructed pixel; and a display step of supplying the luminance signal corrected in the correction step to the pixel, and causing the light emitting element to emit light in accordance with the luminance signal, thereby causing the display device to display.

In addition, a display device according to an aspect 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, the display device including: a conversion unit that converts first correction data for correcting the luminance signal, the first correction data being composed of a plurality of correction data components corresponding to the pixels, into second correction data by propagating error components of the correction data components corresponding to the pixels to peripheral pixels of the pixels and reconstructing the error components, and performing bit reduction on the correction data components of the reconstructed pixels; and a correction section correcting the luminance signal using the second correction data.

With the display device, the correction method for the display device, the manufacturing method for the display device, and the display method for the display device according to the present invention, it is possible to propagate an error component of a correction data component to peripheral pixels and correct a luminance signal using correction data with reduced bits, and therefore, it is possible to reduce the correction data capacity and the transmission rate while securing the accuracy of correction.

Drawings

Fig. 1 is a block diagram showing a configuration of a display device according to embodiment 1.

Fig. 2 shows an example of a circuit configuration of a pixel according to embodiment 1 and connection to a peripheral circuit.

Fig. 3 is a block diagram showing a configuration of a control unit included in the display device according to embodiment 1.

Fig. 4 is a block diagram showing a configuration of a control unit included in a conventional display device.

Fig. 5 is a diagram for comparing the correction processing and the processing result of the display device according to embodiment 1 with those of the conventional display devices.

Fig. 6 is a flowchart for explaining a method of correcting the display device according to embodiment 1.

FIG. 7 is a block diagram of a measurement system for obtaining first correction data.

Fig. 8 is a block diagram showing a configuration of an information processing apparatus that obtains second correction data in a manufacturing process.

Fig. 9 is a flowchart for explaining a method of manufacturing a display device according to embodiment 2.

Fig. 10 is a block diagram showing a configuration of a control unit that causes a display device to display data using second correction data.

Fig. 11 is a flowchart for explaining a display method of the display device according to embodiment 3.

Fig. 12 is an external view of a tablet terminal incorporating the display device according to any one of embodiments 1 to 3.

Description of the symbols

1 display device

2. 2A information processing apparatus

3 image pickup device

10. 500 control part

11. 512 memory

12. 12A conversion part

13 correcting part

20 data line driving circuit

30 scanning line driving circuit

40 display part

121. 121A threshold value determining part

122. 122A bit reduction part

131. 531 luminance signal correcting section

132 data expansion unit

201 arithmetic unit

202 storage unit

203 communication unit

400 pixels

401 organic EL element

402 drive transistor

403 select transistor

404 holding capacity element

411 data line

412 scan line

421 power line

422 common electrode

Detailed Description

Embodiments of a display device and a correction method thereof will be described below with reference to the drawings. The embodiments to be described below are all preferred specific examples in the present application. Therefore, the numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of the constituent elements, steps, and the order of the steps shown in the following embodiments are merely examples, and the present invention is not limited thereto. Therefore, among the components of the following embodiments, components that are not described in the technical means illustrating the uppermost concept of the present invention will be described as arbitrary components.

Each figure is a schematic diagram, and is not a strict illustration. In the drawings, substantially the same constituent elements are denoted by the same reference numerals, and redundant description is omitted or simplified.

(embodiment mode 1)

[1.1 Structure of display device ]

Fig. 1 is a block diagram showing a configuration of a display device 1 according to embodiment 1. The display device 1 in the figure includes: a control section 10, a data line driving circuit 20, a scanning line driving circuit 30, and a display section 40. The control unit 10 has a memory 11. 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. The memory 11 stores processed correction data (second correction data described later) when the manufacturing process of the display device 1 is completed, for example.

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

When the correction data before processing (first correction data described later) is generated in the manufacturing process, for example, the control unit 10 communicates with an external information processing device, and drives the data line drive circuit 20 and the scan line drive circuit 30 in accordance with an instruction from the information processing device.

The control unit 10 performs conversion processing on the correction data (first correction data) before processing, for example, during the manufacturing process, generates the correction data (second correction data) after processing, and stores the correction data after processing 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 shows an example of a circuit configuration of a pixel 400 according to embodiment 1 and connections to peripheral circuits. The pixel 400 in the figure includes: a scanning line 412, a data line 411, a power supply line 421, a selection transistor 403, a drive transistor 402, an organic EL element 401, a holding capacity 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 outputting a luminance signal corrected by the second correction data, that is, an output data voltage, and determining a signal current flowing to the driving transistor 402.

The gate terminal of the selection transistor 403 is connected to the scan line 412, and controls the timing of supplying the data voltage of the data line 411 to the gate terminal of the driving transistor 402.

The gate terminal of the driving transistor 402 is connected to the data line 411 via the selection transistor 403, the source terminal of the driving transistor 402 is connected to the anode terminal of the organic EL element 401, and the drain terminal of the driving transistor 402 is connected to the power supply line 421. Accordingly, the driving 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 a cathode terminal of the organic EL element 401 is connected to the common electrode 422.

The capacitor holding element 404 is connected between the power supply line 421 and the gate terminal of the driving transistor 402. The capacitor element 404 can continue to supply the driving current from the driving transistor 402 to the organic EL element 401 by maintaining the gate voltage until then even after the selection transistor 403 is turned off, for example.

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

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 driving transistor 402 causes a current corresponding to the data voltage to flow between the source and drain terminals. When the current flows into the organic EL element 401, the organic EL element 401 can emit light with light emission luminance corresponding to the current.

In the circuit configuration of the pixel 400 shown in fig. 2, other circuit elements, wirings, and the like may be interposed between paths connecting the circuit elements.

[1.2 Structure of control section ]

Fig. 3 is a block diagram showing the configuration of the control unit 10 included in the display device 1 according to embodiment 1. 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 transfers an error component generated when the correction data component corresponding to each pixel is quantized to a peripheral pixel of each pixel with respect to the correction data (first correction data) before processing having the correction data component of each pixel, and reconstructs the error component, and converts the reconstructed correction data component of each pixel into second correction data with bits reduced.

The correcting section 13 corrects the luminance signal using the second correction data. The luminance signal is an electric 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, the luminance signal is a data voltage applied from the data line driving 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.

Here, the correction data before processing (first correction data) will be described. The first correction data is data for reducing luminance unevenness when each pixel 400 of the display unit 40 emits light, for example, in accordance with a video signal transmitted from the outside to the display device 1. More specifically, the correction data corresponds to, for example, the pixel 400, and is composed of two correction parameters, that is, a gain correction value and a deviation correction value. The correction data described above may be associated not with the pixel 400 but with each pixel group that is an aggregate of a plurality of adjacent pixels.

Fig. 4 is a block diagram showing 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 correcting section 531. In the conventional display device, the control unit 500 stores the first correction data in the memory 512 in advance. Then, the control unit 500 converts the video signal and generates a luminance signal (luminance signal before correction) for each pixel. The luminance signal correction section 531 reads out 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 described above, and adds (or subtracts) the deviation correction value of the first correction data, thereby correcting the luminance signal before correction. The control unit 500 outputs the corrected luminance signal obtained as described above to the data line driving circuit at a predetermined timing. This can reduce the luminance unevenness in the display portion.

The conventional display device described above has a problem that as the resolution of the display portion increases, the amount of correction data to be stored in the memory 512 increases, and the data transfer rate of a luminance signal or the like increases, resulting in a congestion state. Particularly, in a tablet terminal which is required to be small and highly accurate, it is difficult to secure a large-capacity memory, and the cost is increased.

In contrast, in the display device 1 according to the present embodiment, the luminance signal is not corrected by the first correction data (correction data before processing) described above, but is corrected by the correction data (first correction data) before processing by performing the light-weight processing on the correction data (first correction data) before processing, and the correction data (second correction data) after processing obtained by the light-weight processing. A configuration in which the display device 1 according to the present embodiment generates the second correction data from the first correction data will be described below.

The converter 12 includes: the threshold value determining unit 121 and the bit reducing unit 122 propagate error components of correction data components of each pixel constituting the first correction data to peripheral pixels of the pixel, reconstruct the correction data components of each pixel constituting the first correction data, and convert the reconstructed correction data components of the first correction data into second correction data by bit reducing the correction data components.

The threshold value determining unit 121 determines a threshold value to be used in bit reduction by the bit reducing unit 122 in the future, based on the distribution of the 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 determined by the threshold determination unit 121, propagates the error component at that time to the peripheral pixels of each pixel, reconstructs the correction data component of each pixel constituting the first correction data, and bit-reduces the correction data component of the reconstructed first correction data, thereby generating the second correction data. More specifically, the bit reduction unit 122 performs bit reduction on the correction data component of each pixel constituting the first correction data so that the correction data component has a smaller number of bits than the number of bits of the correction data component, based on the threshold value.

Further, the bit reduction unit 122 may binarize ("0" or "1") the correction data component of the reconstructed first correction data based on the threshold value determined by the threshold value determination unit 121. In this case, the correction data can be made to be the most lightweight.

As a quantization method for propagating error components of correction data components of each pixel constituting the first correction data to peripheral pixels of the pixel and reconstructing the correction data components of each pixel constituting the first correction data, for example, an error diffusion method can be used. In addition, the above-described methods can be applied to a dither method typified by random dither, ordered dither, or the like. As the processing performed by the bit reduction unit 122, the error diffusion method is employed, whereby the correction accuracy of the luminance signal can be ensured.

The memory 11 stores second correction data generated by converting the first correction data by the conversion unit 12. The second correction data is smaller in size than the first correction data because it is data obtained by bit-reducing the first correction data. As the resolution of the display unit 40 increases, the effect of reducing the capacity of the memory 11 for storing the second correction data reduced in weight by the converter 12 becomes remarkable. From the viewpoint of not requiring an excessive capacity as a recording medium and a long life, for example, a nonvolatile memory such as a flash memory can be used as the memory 11.

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

The data expansion unit 132 is configured by a volatile first memory such as a DRAM and an arithmetic circuit, for example. The data expansion unit 132 reads the second correction data from the memory 11 and temporarily stores the second correction data in the first memory. Here, at least one of the threshold data determined by the threshold determination unit 121 and the discrete value quantized from the first correction data is stored in a second memory, such as an SRAM, provided in (or outside) the first memory. The arithmetic circuit may expand the second correction data held in the first memory into correction data (discrete values) having a larger number of bits than the number of bits of the second correction data held in the memory 11, using at least one of the threshold data held in the second memory and the discrete values. That is, the correction unit 13 expands the second correction data into data having a higher bit rate than the second correction data using at least one of the threshold data and the discrete value, and performs luminance signal correction on the first correction data using the correction data after bit compression. In the control unit 10 according to the present embodiment, the data expansion unit 132 is not an essential component.

However, since the correction accuracy of the second correction data decreases as the bit reduction rate of the first correction data by the bit reduction unit 122 increases, the data expansion unit 132 is preferably provided when the bit reduction rate is high.

The luminance signal correcting section 131 corrects the luminance signal corresponding to the pixel 400 using the second correction data developed in the data developing section 132. An example of the luminance signal correction process performed by the luminance signal correction unit 131 is described below.

The luminance signal correction unit 131 multiplies (or divides) the data voltage corresponding to the luminance signal before correction out of the second correction data (gain correction value, offset correction value) by the gain correction value, adds (or subtracts) the offset correction value to the multiplied or divided value, and outputs the result to the data line drive circuit 20. Accordingly, it is possible to reduce the correction data capacity and the transmission rate while ensuring the accuracy of the luminance correction.

Here, a specific process of the converter 12 will be described with reference to fig. 5.

Fig. 5 shows a correction process of the display device 1 according to embodiment 1 and a conventional display device and a comparison of the results. The display image shown on the left side of the figure is an example of an image, and in the case of display, the entire display portion is caused to emit light at the same luminance, or the display portion is caused to display a luminance signal without correction. On the other hand, the image shown in the upper right portion 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. The display image shown in the lower right 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 the display image of the display device 1 according to the present embodiment in fig. 5, the conversion unit 12 corrects the image using the second correction data generated by the error diffusion process and the bit reduction process. The first correction data shown in fig. 5 is, for example, a matrix of gain correction values (correction data components) for each pixel. In the display device 1 according to the present embodiment, the first correction data is error-diffused. The following description will be made with reference to correction data in error diffusion shown in fig. 5. For convenience of explanation, in fig. 5, the correction data in error diffusion is composed of 4 × 4 correction data components, and the correction data components are represented by (rows and columns). For example, the upper left correction data component is represented by (1, 1), and the lower right correction data component is represented by (4, 4).

First, as a previous stage of the error diffusion process, the threshold determination unit 121 determines a threshold value (═ 1.012), a decrease value (═ 0.893), and an increase value (═ 1.130) from the distribution state of each correction data component of the first correction data. Here, the lowered value and the raised value are discrete values obtained by quantizing (correction data components of) the first correction data, respectively.

Next, the bit reduction unit 122 compares the correction data components (1, 1) of the first correction data with a threshold value (0.999<1.012), and replaces the correction data components (1, 1) after the error diffusion process with the above-described reduction value (0.893) which is a discrete value. Next, the correction data components (1, 1) are quantized by setting the binary data of the correction data components (1, 1) to "0". Next, the bit reduction unit 122 assigns a difference (error component) (0.106) between the pre-processing data (0.999) and the post-processing data (0.893) in the correction data components (1, 1) with a predetermined weight, and compares a value (1.052 ═ 1.0058+0.046) obtained by adding the assigned value (0.046 ═ 0.106 × 7/16) to the correction data components (1, 2) in the first correction data with a threshold value (1.052> 1.012). Based on the result, the correction data components (1, 2) after the error diffusion process are replaced with the discrete value (1.130) as the increase value. Then, the correction data components (1, 2) are quantized by setting the binary data of the correction data components (1, 2) to "1". Next, the bit reduction unit 122 assigns a difference (-0.124) between the pre-processing data (1.0058) and the post-processing data (1.130) in the correction data components (1, 2) with a predetermined weight, and compares a value (0.9714) obtained by adding the assigned value (-0.054 ═ 0.124 × 7/16) to the correction data components (1, 3) of the first correction data with a threshold value (0.9714< 1.012). As a result, the correction data components (1, 3) after the error diffusion process are replaced with the reduced value (0.893) which is the above-mentioned discrete value, and the binary data thereof is set to "0", thereby quantizing the correction data components (1, 3). The data up to the stage of diffusing the correction data components (1, 2) into the correction data components (2, 1), (2, 2), and (2, 3) of the peripheral pixels are shown below in the correction data in error diffusion of fig. 5. Similarly, the error diffusion process is performed on all the correction data components, whereby the binarized (quantized) second correction data shown in fig. 5 is generated. In the correction data in the error diffusion process of fig. 5, the correction data components (1, 4), (2, 4), and (3, 1) to (4, 4) represent values before the diffusion process.

As described above, the bit reduction unit 122 quantizes the correction data components (1, 1) to (4, 4) of each pixel constituting the first correction data based on the threshold determined by the threshold determination unit 121 by applying the error diffusion process, propagates the error component at that time to the peripheral pixels of each pixel, reconstructs the correction data components of each pixel constituting the first correction data, and bit-reduces the correction data components of the reconstructed first correction data, thereby generating the second correction data. In the above example, the bit reduction unit 122 performs bit reduction of the correction data components of each pixel constituting the first correction data by binarization based on the threshold value.

Next, the data expansion unit 132 reads the binarized (quantized) second correction data, temporarily stores the second correction data in the first memory, and expands the second correction data into correction data (discrete values) having a larger number of bits than the second correction data using a threshold value (1.012), a reduction value (0.893), and an increase value (1.130). More specifically, as shown in the second correction data (after expansion) of fig. 5, the data expansion unit 132 expands "0" as the second correction data component (1, 1) to a reduced value (0.893) using a threshold value (1.012) and a reduced value (0.893). Then, "1" as the second correction data component (1, 2) is developed as an increase value (1.130) using a threshold value (1.012) and an increase value (1.130).

In the present embodiment, the second correction data bits are reduced to 1 bit ("0" or "1") by way of example, but the present invention is not limited thereto. When the second correction data bits are reduced to 2 bits or more, the data expansion unit 132 may expand the data into correction data (discrete values) having a larger number of bits than the second correction data bits using only one of the threshold data and the discrete values obtained by quantizing the correction data components of the first correction data.

For example, in the case where 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 discrete values (corresponding to the ascending value and the descending value in the case of 2 bits) of the quantized first correction data are 0.893 ("0"), 0.927 ("1"), 0.961 ("2"), 0.995 ("3"), 1.028 ("4"), 1.062 ("5"), 1.096 ("6"), 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 the data component in the first memory, and expands each correction data component of the second correction data into a correction data component (discrete value) having a larger number of bits (4 bits or more) than the number of bits of the second correction data using only the above-mentioned 7 thresholds. For example, when the correction data component (1, 1) of the second correction data is "2", the developed correction data component (1, 1) is determined to be a discrete value between the threshold value 0.944 and the threshold value 0.978, and 0.961 ("2") is calculated. When the correction data component (1, 2) of the second correction data is "0", the spread correction data component (1, 2) takes a discrete value smaller than the threshold value 0.910, and 0.893 ("0") is calculated by 0.910- (0.944-0.910)/2 (subtracting half of the threshold interval from 0.910).

The data expansion unit 132 may read each correction data component of the second correction data quantized to "0" to "7", temporarily store the data component in the first memory, and expand each correction data component of the second correction data into a correction data component (discrete value) having a larger number of bits (4 bits or more) than the number of bits of the second correction data using only the above-mentioned 7 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 as 0.927 ("1") having the size of the second bit. When the correction data component (1, 2) of the second correction data is "5", the expanded correction data component (1, 2) is calculated as 1.062 ("5") having the sixth bit size.

The data expansion unit 132 may read each correction data component of the second correction data quantized to "0" to "7", temporarily store the data component in the first memory, and expand each correction data component of the second correction data into correction data (discrete values) having a larger number of bits (4 bits or more) than the number of bits of the second correction data using only the maximum value and the minimum value among the 7 discrete values. For example, the 7 discrete values can be calculated using the maximum value, the minimum value, and the number of bits (3 bits) of the second correction data. Accordingly, 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 0.927 ("1") whose size is the second bit. When the correction data component (1, 2) of the second correction data is "5", the correction data component (1, 2) that is expanded is 1.062 ("5") whose size is calculated to be the sixth bit. When the 7 discrete values are calculated using the maximum value, the minimum value, and the number of bits (3 bits) of the second correction data, the 7 discrete values may be calculated by dividing the 7 discrete values, or may be an array or a random array to which a weight is applied.

As shown in fig. 5, it is understood that the display image displayed by the luminance signal corrected by the control unit 10 of the present embodiment and the conventional control unit 500 is significantly reduced in luminance unevenness as compared with the display image displayed by the luminance signal without correction. However, the number of bits of the correction data differs between the display image by the control unit 10 of the present embodiment and the display image by the conventional control unit 500. That is, the second correction data bit-reduced by the control unit 10 of the present embodiment has a smaller data capacity than the first correction data by the conventional control unit 500. Therefore, according to the display device 1 of the present embodiment, even if the number of pixels of the display unit increases, the correction data capacity and the transmission rate can be reduced while ensuring the accuracy of luminance correction.

In the display device 1 according to the present embodiment, the conversion unit 12 and the correction unit 13 may be realized by an IC which is an integrated circuit, or particularly, by an lsi (large Scale integration). Also, the integrated circuit method may be implemented by a dedicated circuit or a general-purpose processor. After LSI manufacturing, a programmable FPGA (field programmable Gate Array) or a reconfigurable processor capable of reconstructing connection and setting of circuit cells inside LSI may be used. Furthermore, if an integrated circuit technology capable of replacing the LSI appears as a result of progress in semiconductor technology or other derived technologies, it is needless to say that the functional blocks may be integrated by using these technologies. The conversion unit 12 and the correction unit 13 may be realized as a program for executing the above-described encoding process and decoding process, or may be realized as a computer-readable non-transitory recording medium on which the program is recorded, and may be realized as a flexible disk, a hard disk, a CD-ROM, an MO, a DVD-ROM, a DVD-RAM, a BD (Blu-ray (registered trademark) Disc), or a semiconductor memory, for example. These programs can be distributed via a recording medium such as a CD-ROM and a transmission medium such as the internet.

[1.3 correction method for display device ]

Next, a method of correcting the display device 1 according to the present embodiment will be described.

Fig. 6 is a flowchart for explaining a method of correcting the display device 1 according to embodiment 1. Fig. 6 shows a process until the control unit 10 included in the display device 1 corrects the luminance signal by the second correction data. The correction process will be described below with reference to fig. 6.

First, the control unit 10 obtains first correction data (correction data before processing) for correcting a luminance signal for causing the organic EL element 401 to emit light at a predetermined luminance in advance (S10: obtaining step). As described above, the first correction data (correction data before processing) is composed of two correction parameters, for example, a gain correction value and a deviation correction value corresponding to the pixel 400.

Here, a method of obtaining the first correction parameter is exemplified.

FIG. 7 is a block diagram of a measurement system for obtaining 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 device 2 includes: the calculation unit 201, the storage unit 202, and the communication unit 203 have a function of controlling the process until the first correction parameter is generated. As the information processing device 2, for example, a personal computer can be applied.

The imaging device 3 captures an image of the display unit 40 by a control signal from the communication unit 203, and outputs captured image data to the communication unit 203. As the imaging device 3, for example, a CCD camera or a luminance meter can be 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, obtains measurement data from the control unit 10 and the imaging device 3, stores the measurement data in the storage unit 202, and calculates various characteristic values and parameters by performing an operation in the operation unit 201 based on the stored measurement data. The control unit 10 may use a control circuit not built in the display device 1.

Specifically, the information processing apparatus 2 controls the voltage value 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 image pickup device 3 measures the luminance value of the measurement pixel that emits light. The information processing apparatus 2 receives the voltage value and the measured luminance value. The information processing device 2 changes the voltage value to the measurement pixel, performs the same control, and receives different voltage values and measurement luminance values corresponding to the voltage values. By repeating these operations by the information processing device 2, the operation unit 201 calculates the voltage-luminance characteristic of each measurement pixel, and compares the voltage-luminance characteristic with the voltage-luminance characteristic serving as a reference to calculate the correction parameters (gain correction value and offset correction value) of each measurement pixel.

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 obtains first correction data for correcting the luminance signal in advance.

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

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

Subsequently, the control unit 10 stores the second correction data in advance in the memory 11 of the display device 1 (S40: storing step).

Next, the controller 10 reads the second correction data from the memory 11, and develops the second correction data into correction data having a larger number of bits than the second correction data using the threshold value which is the reference value for bit reduction in step S30 (S50).

The above-described development processing in step S50 is not an essential step. However, since the correction accuracy of the second correction data decreases as the bit reduction rate of the first correction data in step S30 increases, it is preferable to perform the expansion processing described above when the bit reduction rate is high.

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

With the above-described correction method of the display device 1 according to the present embodiment, the luminance signal is corrected not by the first correction data (correction data before processing), but by the second correction data processed at the above-described steps S20 and S30. The memory 11 stores second correction data generated by converting the first correction data. The second correction data is data obtained by bit-reducing the first correction data, and therefore has a smaller capacity than the first correction data. Accordingly, as the resolution of the display unit 40 increases, the effect of reducing the capacity of the memory 11 for storing the second correction data having been reduced in weight becomes remarkable. Therefore, it is possible to reduce the correction data capacity and the transmission rate while ensuring the accuracy of the luminance correction.

In step S20, as a method for reconstructing the first correction data by propagating the correction data component corresponding to each pixel to the peripheral pixels of the pixel, an error diffusion method may be used. By adopting the error diffusion method, the correction accuracy of the luminance signal can be ensured. In addition to the error diffusion method, for example, a random dither method, a dither method typified by ordered dither, or the like can be used.

When the error component of the correction data component corresponding to each pixel is propagated to the peripheral pixels of each pixel for reconstruction of the first correction data, the correction data component may be quantized based on a threshold value determined based on the distribution state of the correction data component constituting the first correction data, and the correction data component may be reconstructed based on the error component at that time.

In step S30, the error component of the correction data component corresponding to each pixel may be propagated to the peripheral pixels of the pixel and reconstructed for the first correction data, and the correction data component of each pixel obtained by the reconstruction may be subjected to binarization processing to reduce the bits. In this case, the second correction data can be made to be the most lightweight.

(embodiment mode 2)

In embodiment 1, a description is given of a correction method of the display device 1 in which first correction data is obtained, and second correction data is generated from the first correction data until a luminance signal is corrected by the second correction data. In this embodiment, a method of manufacturing the display device 1 in which the second correction data is generated from the first correction data and stored in the memory 11 of the display device 1 will be described. That is, the manufacturing method of the display device 1 according to the present embodiment is different from the correction method of the display device 1 according to embodiment 1 in that the correction method of the display device 1 according to embodiment 1 includes a step of correcting the luminance signal by the second correction data, and the present embodiment includes a step of storing the second correction data in the memory 11. Hereinafter, the same configurations as those of the display device 1 and the correction method according to embodiment 1 will not be described, and differences will be mainly described.

[2.1 Structure of information processing apparatus in manufacturing Process ]

Fig. 8 is a block diagram showing a configuration of the information processing apparatus 2A that obtains second correction data in the manufacturing process. The information processing device 2A shown in the figure is a device used in a manufacturing process of the display device 1, and includes a conversion unit 12A.

The conversion unit 12A includes a threshold determination unit 121A and a bit reduction unit 122A, and converts error components of correction data components of each pixel constituting the first correction data into second correction data by propagating error components of the correction data components to pixels surrounding the pixel, reconstructing the correction data components of each pixel constituting the first correction data, and performing bit reduction on the correction data components of the reconstructed first correction data.

The threshold determination unit 121A determines a threshold to be used when the bit reduction unit 122A performs bit reduction in the subsequent sequence, based on the distribution of the plurality of correction data components constituting the first correction data.

The bit reduction unit 122A quantizes the correction data component of each pixel constituting the first correction data based on the threshold determined by the threshold determination unit 121A, propagates the error component at that time to the peripheral pixels of each pixel, reconstructs the correction data component of each pixel constituting the first correction data, and bit-reduces the correction data component of the reconstructed first correction data, thereby generating the second correction data. More specifically, the bit reduction unit 122A reduces the correction data component bits of each pixel constituting the first correction data to a correction data component having a smaller number of bits than the number of bits of the correction data component, based on the threshold value.

The bit reduction unit 122A may binarize the correction data component of the reconstructed first correction data ("0" or "1") based on the threshold value determined by the threshold value determination unit 121A. In this case, the correction data can be made to be the most lightweight.

As a quantization method for propagating error components of correction data components of each pixel constituting the first correction data to peripheral pixels of the pixel and reconstructing the correction data components of each pixel constituting the first correction data, for example, an error diffusion method can be used. In addition, the above-described methods can be applied to a dither method typified by random dither, ordered dither, or the like. As the processing performed in the bit reduction unit 122A, the error diffusion method is employed, whereby the correction accuracy of the luminance signal can be ensured.

The first correction data may be obtained by the information processing device 2 shown in fig. 7 of embodiment 1. In this case, the information processing device 2 according to embodiment 1 and the information processing device 2A according to the present embodiment may be the same device, and may have both functions. That is, the information processing device 2A according to the present embodiment may include an arithmetic unit 201, a storage unit 202, and a communication unit 203 in addition to the conversion unit 12A. Further, the first correction data may be attached to the information processing device 2A in advance.

[2.2 method for manufacturing display device ]

Fig. 9 is a flowchart for explaining a method of manufacturing the display device 1 according to embodiment 2. The steps shown in fig. 9 are from the step of forming the display panel included in the display device 1 to the step of storing the second correction data in the memory. The following describes the production process with reference to fig. 9.

First, a display panel constituting the display device 1 is formed (S100: display panel forming step). The following exemplifies a display panel forming process. For example, a planarization film made of an insulating organic material is formed on a substrate including a circuit element such as a TFT, and then an anode is formed on the planarization film. Next, a hole injection layer is formed on the anode, for example. Next, a light-emitting layer is formed on the hole injection layer. Next, an electron injection layer is formed on the light emitting layer. After that, a cathode is formed on the substrate on which the electron injection layer is formed. Through 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 film sealing layer. After that, a color filter is formed on the sealing resin layer. Next, an adhesive layer and a transparent substrate are disposed on the color filter. The 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 downward from the upper surface side of the transparent substrate to cure the sealing resin layer, thereby adhering and fixing the transparent substrate, the adhesive layer, the color filter, and the thin film sealing layer. Through the above-described formation process, a display panel is formed.

Next, the information processing device 2A obtains first correction data (correction data before processing) for correcting a luminance signal for causing the organic EL element 401 to emit light at a predetermined luminance in advance (S110: obtaining step). As described above, the first correction data (correction data before processing) is composed of two correction parameters, for example, a gain correction value and a deviation correction value corresponding to the pixel 400. The method of obtaining the first correction parameter can be obtained by the information processing apparatus 2 described in fig. 7 of embodiment 1, and the first correction parameter of the display panel manufactured in the same batch, for example, can be streamed.

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

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

Subsequently, the information processing apparatus 2A saves the second correction data in advance in the memory 11 of the display apparatus 1 (S140: saving step).

With the above-described correction method of the display device 1 according to the present embodiment, the first correction data (correction data before processing) is not stored in the memory 11, but the second correction data processed in the above-described steps S120 and S130 is stored in the memory 11. The second correction data is data obtained by bit-reducing the first correction data, and therefore has a smaller capacity than the first correction data. Accordingly, as the resolution of the display unit 40 increases, the effect of reducing the capacity of the memory 11 for storing the second correction data having a reduced weight becomes more remarkable. Therefore, it is possible to reduce the correction data capacity and the transmission rate while ensuring the accuracy of the luminance correction.

In step S120, an error diffusion method, that is, a method of propagating the correction data component corresponding to each pixel to the peripheral pixels of the pixel with respect to the first correction data and reconstructing the data, may be employed. By adopting the error diffusion method, the correction accuracy of the luminance signal can be ensured. In addition to the error diffusion method, for example, a dither method typified by a random dither method and an ordered dither method can be applied.

When the error component of the correction data component corresponding to each pixel is propagated to the peripheral pixels of the pixel and reconstructed for the first correction data, the correction data component may be quantized based on a threshold value determined based on the distribution state of the correction data component constituting the first correction data, and the correction data component may be reconstructed based on the error component at that time.

In step S130, the error component of the correction data component corresponding to each pixel may be propagated to the peripheral pixels of the pixel for reconstruction, and the correction data component of each pixel to be reconstructed may be subjected to binarization processing to perform bit reduction. In this case, the second correction data can be made to be lightweight at the maximum.

The information processing device 2A may include the control unit 10 constituting the display device 1, and the control unit 10 may obtain the second correction data and store the second correction data in the memory 11 in the manufacturing process.

(embodiment mode 3)

The correction method of the display device 1 described in embodiment 1 includes obtaining first correction data, generating second correction data from the first correction data, and correcting a luminance signal with the second correction data. In contrast, the display method of the display device 1 described in this embodiment includes reading the second correction data, correcting the luminance signal by the second correction data, and performing pixel display by the corrected luminance signal. That is, the manufacturing method of the display device 1 according to the present embodiment differs from the manufacturing method of the display device 1 according to embodiment 2 in that the manufacturing method of the display device 1 according to embodiment 2 includes a step of storing the second correction data in the memory 11, and the manufacturing method of the display device 1 according to the present embodiment includes a step of reading the stored second correction data and a step of performing pixel display. Hereinafter, the same configurations as those of the display device 1 and the correction method according to embodiment 1 will not be described, and differences will be mainly described.

[3.1 Structure of control section ]

Fig. 10 is a block diagram showing a configuration of the control unit 10 that causes the display device 1 to display data by using the second correction data. The control unit 10 shown in the figure includes a memory 11 and a correction unit 13.

The correcting section 13 corrects the luminance signal using the second correction data. The luminance signal is an electric signal applied to a pixel to cause a light-emitting element included in the pixel to emit light. More specifically, in this embodiment, the luminance signal is a data voltage applied from the data line driving 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.

Here, in the display method according to the present embodiment, the luminance signal is corrected not by the above-described first correction data (correction data before processing), but by the correction data after processing (second correction data) obtained by performing the light-weight processing on the correction data before processing (first correction data). The second correction data is data obtained by bit-reducing the first correction data, and therefore has a smaller capacity than the first correction data.

Accordingly, as the resolution of the display unit 40 increases, the effect of reducing the capacity of the memory 11 storing the second correction data lighter than the first correction data becomes remarkable. From the viewpoint of not requiring an excessive capacity as a recording medium and a long life, a nonvolatile memory such as a flash memory can be applied as the memory 11.

The data expansion unit 132 is configured by a volatile first memory such as a DRAM and an arithmetic circuit, for example. The data expansion unit 132 reads the second correction data from the memory 11 and temporarily stores the second correction data in the first memory. Here, at least one of the threshold data determined by the threshold determination unit 121 and the discrete value quantized from the first correction data is stored in a second memory, which is illustrated as an SRAM and is provided in (or outside) the first memory. The arithmetic circuit may expand the second correction data stored in the first memory into correction data (discrete values) having a larger number of bits than 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 values. That is, the correction unit 13 expands 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 corrects the luminance signal using the correction data after bit compression with respect to the first correction data. In the control unit 10 according to the present embodiment, the data expansion unit 132 is not an essential component.

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

The luminance signal correction section 131 multiplies (or divides) the gain correction value by the data voltage corresponding to the luminance signal before correction among the second correction data (gain correction value, offset correction value), adds (or subtracts) the offset correction value to (or from) the multiplication value, and outputs the result to the data line drive circuit 20. Accordingly, it is possible to reduce the correction data capacity and the transmission rate while ensuring the accuracy of the luminance correction.

[3.2 display method of display device ]

Fig. 11 is a flowchart for explaining a display method of the display device 1 according to embodiment 3. Fig. 11 shows a process of reading out the second correction data from the control unit 10 included in the display device 1, and a process of correcting the luminance signal and displaying the pixel. The calibration process is performed as follows in fig. 11.

First, the control unit 10 reads out the second correction data from the memory 11, and develops the second correction data into correction data having a larger number of bits than the second correction data using at least one of a threshold value, which is a reference value for bit reduction, and a discrete value obtained by quantizing the first correction data (S250).

The above-described development processing in step S250 is not an essential step. However, since the correction accuracy of the second correction data decreases as the bit reduction rate of the first correction data increases, it is preferable to perform the expansion processing described above when the bit reduction rate is high.

Subsequently, 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 described above to each pixel 400, and causes the organic EL element 401 to emit light in accordance with the luminance signal, thereby causing the display device 1 to perform display (S270: display step).

With the display method of the display device 1 according to the present embodiment described above, the luminance signal is corrected not by the first correction data (correction data before processing), but by the second correction data after bit reduction. Second correction data generated by converting the first correction data is stored in the memory 11. The second correction data is data obtained by bit-reducing the first correction data, and therefore has a smaller capacity than the first correction data. Accordingly, as the resolution of the display unit 40 increases, the effect of reducing the capacity of the memory 11 storing the second correction data having been reduced in weight becomes remarkable. Therefore, it is possible to reduce the correction data capacity and the transmission rate while ensuring the accuracy of the luminance correction.

(other embodiments)

Although the above description has been made for embodiments 1 to 3, the display device, the method of correcting the display device, the method of manufacturing the display device, and the method of displaying the display device according to the present invention are not limited to the above embodiments. In the modification examples obtained by performing various modifications that can be conceived by those skilled in the art with respect to the above-described embodiments without departing from the gist of the present invention, various devices incorporating the display device 1 according to the present invention are included in the present invention.

For example, the display device 1, the method for correcting the display device 1, the method for manufacturing the display device 1, and the method for displaying the display device according to embodiments 1 to 3 can be applied to the tablet terminal shown in fig. 12. According to the display device, the correction method for the display device 1, the manufacturing method for the display device 1, and the display method for the display device of the present invention, it is possible to realize a low-cost, high-definition, and small-sized tablet terminal having a display in which luminance unevenness is suppressed.

In the above-described embodiment, the case where the display unit 40 displays an image based on the luminance signal generated from the external video signal has been described as an example, but the present invention is not limited thereto. The luminance signal for causing the pixel to emit light can be generated not only by an external picture signal but also by various signals for displaying a still image or a moving image.

The first correction data is not limited to generation at the time of manufacturing the display device 1. The second correction data is not limited to the way of being stored in the memory 11 at the time of manufacturing the display device 1. Even after the manufacture of the display device 1, during the display operation or during the non-display operation, the first correction data can be updated, and the second correction data can be updated and held in accordance with the updated first correction data.

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 an inorganic material of a current-driven type or a voltage-driven type.

The present invention is particularly effective for application to an organic EL flat panel display incorporating a display device using an organic EL element, and is most suitable for application to a display device requiring a small-sized, high-definition display having uniform image quality, and a correction method therefor.

Claims

1. A method of correcting luminance unevenness of a display device in which pixels having light emitting elements emitting light in accordance with a luminance signal are arranged in a matrix,

the correction method of the display device comprises the following steps:

an obtaining step of obtaining first correction data in advance, the first correction data being composed of a plurality of correction data components corresponding to the pixels and used for correcting the luminance signal;

a conversion step of converting the first correction data into second correction data by propagating error components of correction data components corresponding to the respective pixels to peripheral pixels of the respective pixels and reconstructing the error components, and bit-reducing the correction data components of the reconstructed respective pixels; and

a correction step of correcting the luminance signal using the second correction data,

in the conversion step, the plurality of correction data components constituting the first correction data are propagated to peripheral pixels based on threshold data calculated in advance,

in the correction step, each of a plurality of correction data components constituting the second correction data is spread to data higher in bit than the second correction data by using at least one of the threshold data and the discrete value of the first correction data after quantization, and the luminance signal is corrected by using the spread second correction data.

2. The correction method of a display device according to claim 1,

further comprising a saving step of saving the second correction data in advance to a memory provided in the display device after the converting step,

in the correcting step, the second correction data stored in the memory is read out, and the luminance signal is corrected using the second correction data.

3. The correction method of a display device according to claim 1 or 2,

in the converting step, the plurality of correction data components constituting the first correction data are error-diffused, and the plurality of correction data components after the error diffusion are bit-reduced, whereby the first correction data are converted into second correction data.

4. The correction method of a display device according to claim 1 or 2,

in the converting step, the first correction data is converted into the second correction data by binarizing correction data components of each pixel, which are reconstructed by propagating correction data components corresponding to each pixel to peripheral pixels of the pixel with respect to the first correction data.

5. A method of manufacturing a display device in which pixels having light emitting elements for emitting light in accordance with a luminance signal are arranged in a matrix,

the manufacturing method of the display device comprises the following steps:

a display panel forming step of forming a display panel in which a plurality of the pixels are arranged;

a saving step of saving the second correction data in a memory provided in the display device after the converting step,

the display device may spread each of the plurality of correction data components constituting the second correction data to data having a bit higher than that of the second correction data so that the display device can use at least one of the threshold data and the discrete value quantized by the first correction data to correct the luminance signal using the spread second correction data.

6. The method of manufacturing a display device according to claim 5,

7. The method of manufacturing a display device according to claim 5 or 6,

8. A display method of a display device in which pixels having light emitting elements for emitting light in accordance with a luminance signal are arranged in a matrix,

the display method of the display device comprises the following steps:

a correction step of correcting the luminance signal using second correction data obtained by the obtaining step of obtaining first correction data in advance, the first correction data being composed of a plurality of correction data components corresponding to the pixels and used for correcting the luminance signal, and the conversion step of reconstructing an error component of a correction data component corresponding to each pixel by propagating the error component to a peripheral pixel of the pixel, and converting the first correction data into second correction data by bit-reducing the correction data component of the reconstructed pixel; and

a display step of supplying the luminance signal corrected in the correction step to the pixel and causing the light emitting element to emit light in accordance with the luminance signal to cause the display device to perform display,

9. The display method of a display device according to claim 8,

10. The display method of the display device according to claim 8 or 9,

11. A display device in which pixels having light emitting elements for emitting light in accordance with a luminance signal are arranged in a matrix,

the display device includes:

a conversion unit that converts first correction data for correcting the luminance signal, the first correction data being composed of a plurality of correction data components corresponding to the pixels, into second correction data by propagating error components of the correction data components corresponding to the pixels to peripheral pixels of the pixels and reconstructing the error components, and performing bit reduction on the correction data components of the reconstructed pixels; and

a correcting section that corrects the luminance signal using the second correction data,

the conversion unit propagates the plurality of correction data components constituting the first correction data to peripheral pixels based on threshold data calculated in advance,

in the correction unit, each of a plurality of correction data components constituting the second correction data is expanded into data having a higher bit than that of the second correction data by using at least one of the threshold data and the discrete value quantized by the first correction data, and the luminance signal is corrected by using the expanded second correction data.

12. The display device as set forth in claim 11,

the display device further includes a memory that holds the second correction data,

the correction section reads out the second correction data stored in the memory and corrects the luminance signal using the second correction data.

13. The display device according to claim 11 or 12,

the conversion unit performs error diffusion on the first correction data and performs bit reduction on the correction data component of each pixel after the error diffusion.

14. The display device according to claim 11 or 12,

the conversion unit transmits, to the first correction data, an error component generated when the correction data component corresponding to each pixel is quantized, to a peripheral pixel of each pixel, reconstructs the error component, and binarizes the reconstructed correction data component of each pixel.