JP2011191415A - Display method for display device and the display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display method for a display device for improving a viewing angle characteristic without changing the structure of a display device such as a liquid crystal panel. <P>SOLUTION: Respective image signal levels to be assigned to respective sub pixels constituting a pixel are converted to each image signal level of high level or low level such that the combination of transmission light quantities from respective sub pixels amounts to the light quantity based on the input image signal level of the pixel in accordance with the input image signal level corresponding to the pixel. Therein, every time the input image signal is updated (S1), when the difference of input image signal level between pixels adjacent to each other is less than a predetermined value (S5), the arrangement of each image signal level assigned to the respective sub pixels is changed in the respective sub pixels (S7) and, when the difference is the predetermined value or more (S5), the change of the arrangement is stopped (S6) and the respective sub pixels transmit light quantity of the same color based on the converted respective image signal levels or the respective image signal levels of which the arrangement is changed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a display method and a display device for a display device that displays a monochrome image.

  In a liquid crystal color display device, each pixel forming a display screen is composed of three subpixels corresponding to the three primary colors RGB of light, and each subpixel transmits light at each gradation, thereby allowing multiple pixels. Color display is realized. The liquid crystal display device for displaying in black and white has the same basic structure as the liquid crystal panel for color display, but the color film on each sub-pixel is eliminated and the individual gradations are controlled to match.

  Patent Document 1 has a liquid crystal panel capable of gradation display, and each pixel of the liquid crystal panel is composed of a plurality of subpixels, and is a gradation indicating a relationship between a gradation and a luminance ratio on a display screen of the liquid crystal panel. There is disclosed a liquid crystal display device provided with a distortion adjusting means for adjusting distortion due to a viewing angle of a curve. The distortion adjustment means includes display data generation means for generating display data to be input to the liquid crystal panel, and a look-up table referred to for adjusting distortion due to the viewing angle of the gradation curve. The display data generation unit generates display data indicating different gradation curves for all the subpixels in each pixel based on the lookup table reference result.

  Patent Document 2 describes an image processing method in which a high-luminance pixel that is driven to have higher luminance than luminance data of an image to be displayed and a low-luminance pixel that is driven to have lower luminance than luminance data are combined. Has been. The luminance of the high luminance pixel and the luminance of the low luminance pixel and the area ratio of the high luminance pixel and the low luminance pixel are determined so that the luminance substantially equal to the luminance based on the luminance data to be displayed is obtained.

Japanese Patent No. 3999081 JP 2009-223345 A

  As shown in FIG. 9, the liquid crystal display device has a luminance relationship with respect to an input gradation value when viewed from the front, and a luminance relationship with respect to the input gradation value when the viewing angle is 30 ° or 60 ° obliquely from the front. Have different viewing angle characteristics. The viewing angle characteristic of the liquid crystal display device has a problem that the gamma curve at the intermediate signal level floats as the viewing angle increases to 30 ° and 60 °, and the entire screen becomes whitish. The problem of viewing angle characteristics is not limited to the liquid crystal display device, and may occur in other display devices for structural reasons.

As a conventional technique for solving such a problem, there is a multi-domain technique for dividing the alignment of liquid crystal molecules. The multi-domain technology is also described in Patent Document 1, in which each pixel (each subpixel) of the liquid crystal panel is divided vertically and the liquid crystal alignment directions of the divided pixels (subpixels) are driven in opposite directions. To improve viewing angle characteristics.
Most conventional techniques for improving the viewing angle characteristics, such as the multi-domain technique, change the structure of the liquid crystal panel, leading to an increase in component costs.

  The present invention has been made in view of the above-described circumstances, and configures a pixel according to an input image signal level corresponding to the pixel without changing the structure of a display device such as a liquid crystal panel. By assigning a high image signal level and a low image signal level to each subpixel, the difference in the gamma curve at the intermediate signal level between when viewed from the front and when the viewing angle is large at 30 ° and 60 ° obliquely from the front It is an object of the present invention to provide a display method for a display device and a display device that can improve the apparent viewing angle characteristics.

As shown in FIG. 9, the viewing angle characteristics of the liquid crystal display device are the relationship between the luminance with respect to the input gradation value when viewed from the front and the luminance with respect to the input gradation value when the viewing angle is large at 30 ° and 60 °. In relation, the difference in luminance is large at the intermediate gradation, but is relatively small at the high gradation and the low gradation.
In the present invention, using such characteristics, a subpixel is driven at a high gradation and a low gradation as much as possible, and a luminance value as a whole of a plurality of subpixels constituting the pixel is given to the pixel. It was made to correspond to the luminance value of the tone value. As a result, since the subpixels are driven with high gradation and low gradation that do not depend on the viewing angle, there is a difference in luminance between when viewed from the front and when the viewing angle is large at 30 ° and 60 ° obliquely from the front. It feels small, and the apparent viewing angle characteristics of the entire liquid crystal panel are improved.

  Specifically, as shown in FIG. 4, the luminance corresponding to the gradation value given to the pixel when viewed from the front (in FIG. 4, the maximum luminance is displayed as 100%) and the sub-units constituting the pixel High luminance or low luminance is allocated to each sub-pixel so that the average luminance of the entire pixel (for example, the sum of (luminance × area ratio)) matches.

As described above, since a high gradation value and a low gradation value are assigned to the sub-pixels, the gradation difference between the sub-pixels becomes remarkable, and there is a possibility that the image has a noticeable graininess. In order to avoid this, as shown in FIG. 6, every time the gradation value of the subpixel is updated, the gradation value assigned to the subpixel is rotated.
Furthermore, contrary to the elimination of graininess, in the case of an image that requires sharpness, such as text and line drawings, there is a problem that sharpness is impaired if the above-described rotation of gradation values is executed. In order to solve this problem, rotation is stopped when the difference in gradation value between adjacent pixels is large.

  A display method for a display device according to a first aspect of the invention includes a large number of subpixels arranged in a matrix on a display screen, and each pixel composed of a plurality of subpixels is driven according to an input image signal. An input image corresponding to a pixel in a display method of a display device that displays a single color image by allowing a sub-pixel to transmit the same amount of light with different drive signals based on the given drive signal Depending on the signal level, each image signal level to be assigned to each sub-pixel constituting the pixel is a high or low image signal level that can be driven by each sub-pixel. The combination of the amount of light transmitted from the pixel is converted into each image signal level that is a light amount based on the input image signal level. Is updated, the difference in the input image signal level between adjacent pixels is calculated, and when the calculated difference is less than a predetermined value, the arrangement of each image signal level assigned to each sub-pixel constituting the pixel is changed. If the change is made within a sub-pixel and the difference is greater than or equal to a predetermined value, the change of the arrangement is stopped, and each sub-pixel is driven by the converted image signal level or the drive signal based on the changed image signal level. And transmitting the same amount of light.

  In the display method of the display device according to the second aspect of the present invention, a table in which each image signal level to be assigned to each subpixel constituting the pixel is recorded for each subpixel according to the input image signal level corresponding to the pixel. Each image to be assigned to each subpixel from the input image signal level corresponding to the pixel is read out from the table based on the input image signal level corresponding to the pixel. The signal level is converted.

  A display device according to a third aspect of the present invention includes a large number of sub-pixels arranged in a matrix on a display screen, and a drive signal corresponding to an input image signal is given to each pixel composed of a plurality of sub-pixels. In accordance with the input image signal level corresponding to the pixel in the display device that displays a monochromatic image by transmitting the same amount of light with each different drive signal based on the given drive signal. Each image signal level to be assigned to each sub-pixel constituting the pixel is a high level or low level of the image signal level that can be driven by each sub-pixel, and the amount of light transmitted from each sub-pixel based on the image signal level. A conversion means for converting each image signal level to a light amount based on the input image signal level, and the input image signal is updated Each time, a calculating means for calculating a difference in input image signal level between adjacent pixels, a determining means for determining whether the difference calculated by the calculating means is less than a predetermined value, and the determining means If it is determined that the image signal level is allocated to each sub-pixel constituting the pixel, the changing means for changing the arrangement of each image signal level in each sub-pixel, and the determination means is determined to be greater than or equal to a predetermined value, Stop means for stopping the change of the arrangement, and each sub-pixel has the same color with a drive signal based on each image signal level converted by the conversion means or each image signal level changed by the change means It is configured to transmit the light amount.

  In the display method of the display device according to the first invention and the display device according to the third invention, the display screen is provided with a large number of subpixels arranged in a matrix, and an input is made to each pixel composed of a plurality of subpixels. A drive signal corresponding to the received image signal is given, and based on the given drive signal, the sub-pixels transmit the same amount of light with different drive signals, thereby displaying a monochromatic image. Depending on the input image signal level corresponding to the pixel, each image signal level to be assigned to each sub-pixel constituting the pixel is converted into a high or low level of the image signal level that each sub-pixel can drive. Therefore, a combination of light amounts transmitted from each sub-pixel based on the image signal level is converted into each image signal level that becomes a light amount based on the input image signal level. Each time the input image signal is updated, the calculation means calculates the difference in the input image signal level between adjacent pixels, and the determination means determines whether the calculated difference is less than a predetermined value. When the determination unit determines that the value is less than the predetermined value, the changing unit changes the arrangement of the image signal levels assigned to the sub-pixels constituting the pixel within each sub-pixel. When the determination unit determines that the value is equal to or greater than the predetermined value, the stop unit stops changing the arrangement. Each sub-pixel transmits the light amount of the same color by a drive signal based on each image signal level converted by the conversion unit or each image signal level changed by the changing unit.

  In the display device according to a fourth aspect of the present invention, the conversion means stores, for each sub-pixel, a table in which each image signal level to be assigned to each sub-pixel constituting the pixel is recorded according to the input image signal level corresponding to the pixel. Each image signal to be assigned to each subpixel from the input image signal level corresponding to the pixel by reading each image signal level assigned to each subpixel from the table based on the input image signal level corresponding to the pixel It is configured to convert the level.

  In the display method of the display device according to the second invention and the display device according to the fourth invention, each of the image signals to be assigned to each sub-pixel constituting the pixel according to the input image signal level corresponding to the pixel by the conversion means. A table recording levels is provided for each sub-pixel. The converting means reads each image signal level assigned to each sub-pixel from each table based on the input image signal level corresponding to the pixel, whereby each image to be assigned to each sub-pixel from the input image signal level corresponding to the pixel. Convert signal level.

  According to the display method and the display device of the display device according to the present invention, it is possible to improve the apparent viewing angle characteristics without changing the structure of a display device such as a liquid crystal panel, and depending on the type of image, It is possible to eliminate graininess and maintain sharpness.

1 is a block diagram illustrating a schematic configuration of a liquid crystal display device which is an embodiment of a display method and a display device according to the present invention. It is a block diagram which shows the structural example of a viewing angle correction | amendment part. It is explanatory drawing for demonstrating the specific example of each lookup table which a table part has. It is explanatory drawing for demonstrating the example of each lookup table shown in FIG. It is a block diagram which shows the structural example of a counter. It is explanatory drawing which shows the example of the rotation of the gradation value of each sub pixel in a pixel. It is explanatory drawing which shows the example of a pattern of the rotation of the gradation value of each sub pixel in a pixel. It is a flowchart which shows the example of operation | movement of a rotation determination part. It is a characteristic view which shows the example of the viewing angle characteristic of a liquid crystal display device.

Hereinafter, the present invention will be described with reference to the drawings illustrating embodiments thereof.
FIG. 1 is a block diagram showing a schematic configuration of a liquid crystal display device which is an embodiment of a display method and a display device according to the present invention.
The liquid crystal display device has a gain adjustment level shift circuit 1 that converts an input image signal to a desired level, and a speed at which the screen of the image signal converted to a desired level by the gain adjustment level shift circuit 1 is rewritten. A frame rate conversion unit 2 that converts the screen of the liquid crystal panel 5 to a rewriting speed. Further, a scaling unit 3 is provided that converts the image signal converted by the frame rate conversion unit 2 in accordance with the number of pixels corresponding to the resolution of the liquid crystal panel 5 and converts it into a gradation value.

  The liquid crystal display device also adjusts the gradation value (image signal level) of the sub-pixel for each pixel of the image signal converted into the number of pixels corresponding to the resolution of the liquid crystal panel 5 and converted into a gradation value. A viewing angle correction unit 4 for correcting the viewing angle characteristics is provided. The viewing angle correction unit 4 is supplied with a horizontal synchronization signal HS and a vertical synchronization signal VS.

  This liquid crystal display device is also given a horizontal synchronizing signal HS and gradation value data for each subpixel, converts the gradation values for each subpixel arranged in a matrix of the liquid crystal panel 5 into a voltage, and outputs 1 A data line driving circuit 6 held for each column and a timing signal for selecting a subpixel to which the data line driving circuit 6 applies a voltage value for each column based on a given vertical synchronization signal VS. And a gate line driving circuit 7 for outputting.

FIG. 2 is a block diagram illustrating a configuration example of the viewing angle correction unit 4.
In this viewing angle correction unit 4, image data (image signal) converted into gradation values for each pixel is supplied to the table unit 12 and the rotation determination unit 14.
The rotation determination unit 14 is supplied with a clock CLK and a data enable signal DE indicating whether or not image data (image signal) is present (the blank period of the image data is at L level), and each sub pixel obtained by the table unit 12 It is determined whether or not the arrangement of the gradation value (image signal level) of the pixel is rotated within the subpixel. The rotation is executed so as to be a combination according to the numerical value of 0-5 given from the counter 15.

The table unit 12 includes a lookup table (LUT0, LUT1, LUT2) for each of the subpixels 0, 1, and 2 as shown in FIG. 3, and each lookup is performed based on the input gradation value for each pixel of the image data. By referring to the table, the gradation value of each sub-pixel is output and given to the rotation unit 13.
Note that each lookup table shown in FIG. 3 shows only representative values for every 16 gradation values of pixels, and other gradation values are omitted. The subpixels 0, 1, and 2 are assigned numbers in the order of the pixel scanning direction.

  Each lookup table shown in FIG. 3 is determined according to the gradation value given to the pixel. FIG. 4 is a gradation characteristic diagram of the liquid crystal panel 5 with the gradation value on the X axis and the amount of light transmitted from the liquid crystal panel 5 based on the gradation value, that is, the luminance value on the Y axis. The gradation characteristics and the gradation characteristics defined for the output of each lookup table in FIG. 3 are shown. The luminance value is expressed as a percentage for convenience. For example, as shown in FIG. 4, the luminance (ideal gradation) according to the gradation value given to the pixel when viewed from the front, and the luminance (for example, (luminance × area ratio)) of the plurality of subpixels as a whole. As much as possible, high luminance or low luminance is distributed to each sub-pixel so that the sum matches. A gradation value (high gradation value or low gradation value) corresponding to the allocated luminance is assigned to each sub-pixel to obtain each lookup table. Here, the number of subpixels is 3, and the area ratio of each subpixel to the pixel is 1/3.

FIG. 5 is a block diagram illustrating a configuration example of the counter 15.
This counter 15 circulates from 0 to 5 when the data enable signal DE is at the H level (data signal is present) and becomes the rising or falling edge of the clock CLK as a trigger (reset when counting to 5). A DE counter 16 is provided for resetting the horizontal synchronizing signal HS at the H level. Further, the H counter 17 that circulates and counts the rising edge of the horizontal synchronizing signal HS from 0 to 5 and resets the rising edge of the vertical synchronizing signal VS, and the V that circulates and counts the rising edge of the vertical synchronizing signal VS from 0 to 5 is counted. And a counter 18.

  The count values of the DE counter 16, the H counter 17 and the V counter 18 are added by an adder 19, and the added numerical value is divided by 6 in the arithmetic unit 20 to obtain a remainder 0-5. The obtained remainder is given to the rotation unit 13 to determine a combination of gradation values of each sub-pixel after the rotation is executed.

FIG. 6 shows a state of rotation processing in which the arrangement of gradation values of each subpixel is changed for each frame. In this way, by rotating the arrangement of the gradation values of each sub-pixel for each frame, the graininess generated in the pixel is eliminated. This is particularly effective for still images in which the same gradation value is continuously input.
Further, FIG. 7A shows a state of rotation processing in which the arrangement of gradation values of each sub-pixel is changed between pixels. In the figure, DEcnt is a counter value of the DE counter 16 and corresponds to each pixel, and Hcnt is a counter value of the H counter 17 and corresponds to a scanning line. In the figure, R0 to R5 indicate combinations of gradation value arrangements assigned to the sub-pixels. FIG. 7B shows a combination of the arrangement of three gradation values (L0, L1, L2) assigned to each subpixel. The number of combinations is not limited to five, and may be fewer combinations. For convenience, FIG. 7A shows 12 counts for both DEcnt and Hcnt. Actually, DEcnt is a matrix for the number of pixels on the scanning line, and Hcnt is a matrix for the number of lines on the display screen.

The rotation unit 13 performs rotation on the combination corresponding to the given remainder 0-5, and thereby the combination R0-R5 transitions in a pattern as shown in FIG. As a whole screen, the gradation value arrangement is uniform, and the graininess that occurs on one screen is eliminated. This is particularly effective for an image having a large area of the same gradation value.
It should be noted that any of the gradation values L0, L1, and L2 is assigned to each of the sub-pixels of the combination R0 to R5 shown in FIG. 7B. In order to avoid flicker due to the killer pattern, an arbitrary value is set by the register. You may be able to set it.

In the liquid crystal display device having such a configuration, the input image signal is converted to a desired level by the gain adjustment level shift circuit 1, and then the speed at which the screen is rewritten by the frame rate conversion unit 2 is displayed on the liquid crystal panel 5. The data is converted together, and the scaling unit 3 converts the number of pixels according to the resolution of the liquid crystal panel 5 into a gradation value.
The viewing angle correction unit 4 adjusts the gradation value of the sub-pixel for each pixel, and the apparent viewing angle characteristic is improved.

The horizontal synchronization signal HS given together with the input image signal and the gradation value data for each subpixel adjusted by the viewing angle correction unit 4 are given to the data line driving circuit 6 and given along with the input image signal. VS is supplied to the gate line driving circuit 7.
The data line driving circuit 6 converts the gradation value for each subpixel arranged in a matrix of the liquid crystal panel 5 into a voltage and holds it for each column, and holds the timing signal (address) from the gate line driving circuit 7. The signal is applied to the subpixel for each column selected by the signal. As a result, an image is displayed on the liquid crystal panel 5.

FIG. 8 is a flowchart illustrating an example of the operation of the rotation determination unit 14 included in the viewing angle correction unit 4. The operation of the rotation determination unit 14 will be described below with reference to the flowchart of FIG.
When the clock CLK is input (S1), the rotation determination unit 14 reads the gradation value Gt of the pixel included in the image data and the data enable signal DE (S2), and the read data enable signal DE is at the H level. It is determined whether or not (S3).

The rotation determination unit 14 sets the gradation value Gt-1 of the previous pixel to 0 (S4) if the read data enable signal DE is not H level (if it is a blank period) (S3), Wait until the next clock CLK is input (S1).
If the read data enable signal DE is at the H level (S3), the rotation determination unit 14 determines the absolute value of the difference between the gradation value Gt of the pixel and the gradation value Gt-1 of the previous pixel. It is determined whether or not the calculated absolute value is equal to or greater than a predetermined value Th (S5). The predetermined value Th is set to 7, for example.

If the calculated absolute value is equal to or greater than the predetermined value Th (S5), the rotation determination unit 14 gives a rotation OFF signal to the rotation unit 13 (S6), and the gradation value Gt of the pixel is set to the previous pixel. After setting the gradation value Gt-1 (S8), the process waits until the next clock CLK is input (S1).
Thereby, the rotation unit 13 gives the gradation value of each sub-pixel acquired by the table unit 12 according to the gradation value Gt of the pixel to the data line driving circuit 6 without performing the rotation.

If the calculated absolute value is not equal to or greater than the predetermined value Th (S5), the rotation determination unit 14 gives a rotation on signal to the rotation unit 13 (S7), and sets the gradation value Gt of the pixel of the previous pixel. After setting the gradation value Gt-1 (S8), the process waits until the next clock CLK is input (S1).
As a result, the rotation unit 13 combines the gradation value of each sub-pixel acquired by the table unit 12 according to the gradation value Gt of the pixel according to the counter output 0-5 given from the counter 15 at that time. Rotation is performed according to R0 to R5, and the data line driving circuit 6 is supplied.
In this embodiment, the rotation is determined based on the gradation value difference from the previous pixel. However, the rotation is turned on / off later as compared with the next pixel. Good. Further, the comparison range is not limited to one pixel, and rotation may be turned on / off based on the tendency of the gradation change compared to before and after a plurality of pixels.

In the operation described above, focusing on one pixel, every time a frame is updated, the gradation value of each sub-pixel is rotated, and the gradation value of each sub-pixel is averaged and projected in time series. The gradation value is not felt and the graininess is eliminated.
Also, when paying attention to one screen, the gradation value of each sub-pixel is rotated for each pixel, and the arrangement of gradation values of each sub-pixel is spatially distributed, and a protruding gradation value is felt. The graininess is eliminated.
If the calculated absolute value is greater than or equal to the predetermined value Th and the image requires sharpness, such as text and line drawings, the gradation value of each subpixel is rotated every time the frame is updated. The sharpness is maintained.

In this embodiment, the number of sub-pixels constituting a pixel is set to 3, but even when the number of sub-pixels is other plural numbers, for example, the number of sub-pixels is 2, 4 or the like, the same as in this embodiment. Needless to say, you can.
In this embodiment, the liquid crystal display device has been described. However, the present invention is not limited to this, and a display device including a display device having other viewing angle characteristics may be used.
In this embodiment, the digital gradation value is used as the input signal in the example. However, the present invention is not limited to this, and an analog signal may be used.
In this embodiment, the image signal is converted using the lookup table. However, the present invention is not limited to this. The conversion formula is stored in advance, and the image signal assigned to each subpixel is obtained by calculation each time. You may do it.

Further, in FIG. 6, the pixel divided into three in the line scanning direction is illustrated, but the same can be applied to a pixel divided perpendicular to the line scanning direction. In this case, it is preferable to perform rotation on / off based on a result of comparison with an adjacent pixel on the previous line, not a pixel in the line scanning direction. In this case, adjacent pixels on the subsequent line may be used, and the number of pixels to be compared is not limited to one.
Furthermore, the present invention can be similarly applied to pixels divided in the line scanning direction and the vertical direction thereof, such as a multi-domain pixel. In that case, the rotation is preferably turned on / off based on the result of comparison with adjacent four or more pixels.
The display device may be any device that drives the sub-pixels with the same color, and may be a bluish blue base display device used in a medical field as well as a monochrome display device.

2 Frame rate conversion unit 3 Scaling unit 4 Viewing angle correction unit (table, conversion means)
5 LCD panel (display screen)
6 Data line drive circuit 7 Gate line drive circuit 12 Table section (table)
13 Rotation part (change means, stop means)
14 Rotation determination unit (calculation means, determination means)
15 Counter 16 DE Counter 17 H Counter 18 V Counter 19 Adder 20 Calculator

Claims (4)

A display screen is provided with a large number of subpixels arranged in a matrix, and a drive signal corresponding to an input image signal is given to each pixel composed of a plurality of subpixels. Based on the given drive signal In the display method of the display device for displaying a monochromatic image by allowing the sub-pixels to transmit the same amount of light with different drive signals,
Depending on the input image signal level corresponding to the pixel, each image signal level to be assigned to each sub-pixel constituting the pixel is a high or low level of the image signal level that each sub-pixel can drive, Each time the input image signal is updated by converting the combination of the amount of light transmitted from each sub-pixel based on the signal level into each image signal level that becomes the amount of light based on the input image signal level, the input image signal with the adjacent pixel When the difference in level is calculated and the calculated difference is less than a predetermined value, the arrangement of the image signal levels assigned to each subpixel constituting the pixel is changed in each subpixel, and the difference is greater than or equal to the predetermined value. If there is, the change of the arrangement is stopped, and each sub-pixel is converted into each converted image signal level or each changed image signal level. Display method of a display device, characterized in that for transmitting the quantity of the same color in the drive signal based.   A table recording each image signal level to be assigned to each sub-pixel constituting the pixel according to the input image signal level corresponding to the pixel is prepared for each sub-pixel, and the input image signal level corresponding to the pixel is prepared. 2. The display device according to claim 1, wherein each image signal level to be assigned to each subpixel is converted from an input image signal level corresponding to the pixel by reading each image signal level assigned to each subpixel from the table based on the table. How to display. A display screen is provided with a large number of subpixels arranged in a matrix, and a drive signal corresponding to an input image signal is given to each pixel composed of a plurality of subpixels. Based on the given drive signal In a display device that displays a monochromatic image by allowing the sub-pixels to transmit the same amount of light with different drive signals,
Depending on the input image signal level corresponding to the pixel, each image signal level to be assigned to each sub-pixel constituting the pixel is a high or low level of the image signal level that each sub-pixel can drive, A conversion means for converting a combination of light amounts transmitted from each sub-pixel based on the signal level into each image signal level having a light amount based on the input image signal level, and an adjacent pixel each time the input image signal is updated A calculation unit that calculates a difference between input image signal levels, a determination unit that determines whether the difference calculated by the calculation unit is less than a predetermined value, and a determination unit that determines that the determination unit is less than a predetermined value; Changing means for changing the arrangement of each image signal level assigned to each sub-pixel constituting the pixel within each sub-pixel; When it is determined as above, a stop unit that stops the change of the arrangement is provided, and each sub-pixel has each image signal level converted by the conversion unit, or each image signal level changed by the change unit A display device configured to transmit a light amount of the same color by a drive signal based on the above.   The conversion means includes, for each sub-pixel, a table that records each image signal level to be assigned to each sub-pixel constituting the pixel according to the input image signal level corresponding to the pixel, and the input image corresponding to the pixel. Each image signal level to be assigned to each subpixel is converted from the input image signal level corresponding to the pixel by reading each image signal level assigned to each subpixel from the table based on the signal level. The display device according to claim 3.

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