JP2012194344A - Method for driving electro-optic device, control device of electro-optic device, electro-optic device, and electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an image displayed after initialization processing from being perceived spread beyond a region of pixels constituting the image.SOLUTION: In initialization processing for initializing a display unit 3, an electro-optic device executes a first step of making pixels 100 in odd rows and odd columns black, making pixels 100 in odd rows and even columns white, making pixels 100 in even rows and odd columns white, and making pixels 100 in even rows and even columns black. Next, a second step of making pixels 100 in odd rows and odd columns white, making pixels 100 in odd rows and even columns black, making pixels 100 in even rows and odd columns black, and making pixels 100 in even rows and even columns white is executed to terminate the initialization processing.

Description

  The present invention relates to a technique for initializing a display unit of an electro-optical device.

  In an electrophoretic display device, there is a display device disclosed in Patent Document 1 as an invention that prevents an afterimage of a previous image from remaining when a new image is displayed. This display device has a first checkerboard display in which one of adjacent pixels is black and the other is white, and a pixel that is black in the first checkerboard pattern is white and a pixel that is white is black The second checkerboard pattern is displayed alternately, and after all the pixels are finally made white, a new image is displayed.

JP 2009-58645 A

  By the way, in an electrophoretic display device, when a new black image is displayed after all the pixels are in a white state, black electrophoresis is performed even in the white pixels adjacent to the pixels in the contour portion of the black image. Particles may move and the area perceived as black may appear wider than the area of the black pixel. Also, even if all pixels are black before displaying a new image, when a white image is newly displayed, white electrophoretic particles are also present in the black pixels adjacent to the pixels in the outline portion of the white image. As a result, the region perceived as white may appear wider than the white pixel region.

  The present invention has been made in view of the above-described problems, and one of its purposes is to prevent the image displayed after the initialization process from being perceived as being spread out from the pixel area constituting the image. .

In order to achieve the above object, a driving method of an electro-optical device according to the present invention includes a display including a plurality of pixels each having charged particles between a first electrode and a second electrode paired with the first electrode. In the driving method of the electro-optical device including the display unit, the initialization process for initializing the pixels of the display unit includes a first region and a first region each including one or a plurality of the pixels adjacent to each other in the display unit. Of the two areas, the gradation of the pixels in the first area is different from the gradation of the pixels in the second area, and the display unit is finished in the final step to make the display area halftone. To do.
According to the present invention, when a new image is displayed after the initialization process, the pixels in the contour portion of the image are moved from the first electrode to the second electrode, and from the second electrode. Since both of them move toward the first electrode, it is possible to prevent the displayed image from being perceived as being wider than the area of the pixels constituting the displayed image.

In the present invention, the initialization processing may change the gradation of the pixels in the first region to a gradation different from the gradation in the final step, while setting the gradation of the pixels in the second region in the final step. A configuration may be adopted in which a step for setting a gradation different from the gradation is provided before the final step.
According to this configuration, since the particles of the pixels in the first region and the particles of the pixels in the second region are agitated, it is difficult to visually recognize the afterimage of the image before initialization.

In the present invention, the pixels are arranged in a matrix, each pixel is provided with a pixel circuit that determines a display state of the pixel, a scanning line is provided for each row of the pixel circuit, and data is provided for each column of the pixel circuit. A line may be provided, and the first region and the second region may be regions along a direction in which the data line extends.
According to this configuration, since it is not necessary to change the signal supplied to the data line every time a scanning line is selected, power consumption can be suppressed.

In the present invention, in the initialization process, the sizes of the first area and the second area are changed according to an image displayed on the display unit before the initialization process. Also good.
According to this configuration, the sizes of the first area and the second area are changed according to the image displayed before the initialization, and the afterimage of the image before the initialization becomes difficult to be visually recognized.

In order to achieve the above object, a control device for an electro-optical device according to the present invention includes a plurality of pixels provided with charged particles between a first electrode and a second electrode paired with the first electrode. A control device for an electro-optical device including a display unit, wherein the first unit and the second region are adjacent to each other in the display unit, and each of the first region and the second region includes pixels of the first region. And initialization means for ending the initialization of the pixels of the display unit in a process in which the gradation of the pixels in the second region is changed to make the display unit a halftone of the area gradation. To do.
According to the present invention, when a new image is displayed after the initialization process, the pixels in the contour portion of the image are moved from the first electrode to the second electrode, and from the second electrode. Since both of them move toward the first electrode, it is possible to prevent the displayed image from being perceived as being wider than the area of the pixels constituting the displayed image.

In order to achieve the above object, an electro-optical device according to the present invention includes a display unit including a plurality of pixels provided with charged particles between a first electrode and a second electrode paired with the first electrode. An electro-optical device provided in the display unit, wherein the gradation of the pixels in the first region out of the first region and the second region, which are adjacent to each other in the display unit and each include one or a plurality of the pixels, and the second region The initialization of the pixels of the display unit is completed by the process of making the display unit a halftone of the area gradation by changing the gradation of the pixels in the region.
According to the present invention, when a new image is displayed after the initialization process, the pixels in the contour portion of the image are moved from the first electrode to the second electrode, and from the second electrode. Since both of them move toward the first electrode, it is possible to prevent the displayed image from being perceived as being wider than the area of the pixels constituting the displayed image.

  The present invention can be conceptualized not only as an electro-optical device but also as an electronic apparatus having the electro-optical device.

1 is a diagram showing a configuration of an electro-optical device 1 according to an embodiment of the present invention. FIG. 4 is a partial cross-sectional view of the display unit 3. FIG. 5 shows a configuration of a pixel circuit 110. The figure for demonstrating the initialization process. The figure for demonstrating the effect of an initialization process. 1 is an external view of an electronic book reader 1000. FIG. The figure for demonstrating the initialization process concerning a modification. The figure for demonstrating the initialization process concerning a modification. The figure for demonstrating the initialization process concerning a modification. The figure for demonstrating the initialization process concerning a modification.

[Embodiment]
(Configuration of the embodiment)
FIG. 1 is a diagram showing a configuration of an electro-optical device 1 according to an embodiment of the present invention. The electro-optical device 1 includes a controller 2, a display unit 3, a scanning line driving circuit 4, and a data line driving circuit 5. The controller 2 is a control device that outputs various signals for driving the pixels included in the display unit 3 and controls each unit. In the display unit 3, m rows of scanning lines 112 are provided along the row direction (X direction), and n columns of data lines 114 are provided along the column direction (Y direction). In the display unit 3, the pixel circuits 110 are provided in a matrix form with m rows × n columns along the row direction and the column direction. The pixel circuit 110 is connected to the scanning line 112 and the data line 114. For example, the pixel circuit 110 in the first row and the first column is connected to the scanning line 112 in the first row and the data line 114 in the first column.

  FIG. 2 is a partial cross-sectional view of the display unit 3. As shown in FIG. 2, the display unit 3 is roughly divided into a first substrate 10, an electrophoretic layer 20, and a second substrate 30. The first substrate 10 is a substrate in which a circuit layer is formed on an insulating and flexible substrate 11. The substrate 11 is made of polycarbonate in this embodiment. The substrate 11 is not limited to polycarbonate, and a resin material having lightness, flexibility, elasticity, and insulation can be used. Moreover, the board | substrate 11 may be formed with the glass which does not have flexibility. An adhesive layer 11a is provided on the surface of the substrate 11, and a circuit layer 12 is laminated on the surface of the adhesive layer 11a.

  The circuit layer 12 includes a plurality of scanning lines 112 arranged in the row direction, and a plurality of data lines 114 arranged in the column direction so as to be electrically insulated from each scanning line 112. . The circuit layer 12 includes a pixel circuit 110 including an n-channel thin film transistor (hereinafter referred to as “TFT”) that is a switching element, and a pixel electrode 13a (first electrode). ing. The configuration of the pixel circuit 110 will be described later.

  The electrophoretic layer 20 includes a binder 22 and a plurality of microcapsules 21 fixed by the binder 22, and is formed on the pixel electrode 13a. Note that an adhesive layer formed of an adhesive may be provided between the microcapsule 21 and the pixel electrode 13a.

  The binder 22 is not particularly limited as long as it has a good affinity with the microcapsule 21, an excellent adhesion with the electrode, and an insulating property. A dispersion medium and electrophoretic particles are stored in the microcapsule 21. As a material constituting the microcapsule 21, it is preferable to use a flexible material such as a gum arabic / gelatin compound or a urethane compound.

  Dispersion media include water, alcohol solvents (methanol, ethanol, isopropanol, butanol, octanol, methyl cellosolve, etc.), esters (ethyl acetate, butyl acetate, etc.), ketones (acetone, methyl ethyl ketone, methyl isobutyl ketone, etc.) , Aliphatic hydrocarbons (pentane, hexane, octane, etc.), alicyclic hydrocarbons (cyclohexane, methylcyclohexane, etc.), aromatic hydrocarbons (benzene, toluene, benzenes with long chain alkyl groups (xylene) Hexylbenzene, hebutylbenzene, octylbenzene, nonylbenzene, decylbenzene, undecylbenzene, dodecylbenzene, tridecylbenzene, tetradecylbenzene)), halogenated hydrocarbons (methylene chloride, chloroform, carbon tetrachloride) 1,2-dichloroethane, etc.), it can be any of such carboxylates, and the dispersion medium may be other oils. These substances can be used alone or in combination as a dispersion medium, and a surfactant or the like may be further blended to form a dispersion medium.

  Electrophoretic particles are particles (polymer or colloid) having the property of moving by an electric field in a dispersion medium. In the present embodiment, white electrophoretic particles and black electrophoretic particles are stored in the microcapsule 21. The black electrophoretic particles are particles made of a black pigment such as aniline black or carbon black, and are positively charged in this embodiment. The white electrophoretic particles are particles made of a white pigment such as titanium dioxide or aluminum oxide, and are negatively charged in this embodiment.

  The second substrate 30 includes a film 31 and a common electrode layer 32 (second electrode) formed on the lower surface of the film 31. The film 31 plays a role of sealing and protecting the electrophoretic layer 20 and is, for example, a polyethylene terephthalate film. The film 31 is transparent and has an insulating property. The common electrode layer 32 is made of a transparent conductive film such as an indium oxide film (ITO film), for example. In the present embodiment, the film 31 side is the side on which the user visually recognizes the image.

  Returning to FIG. 1, the scanning line driving circuit 4 is connected to each scanning line 112 of the display unit 3, and applies scanning signals Y1, Y2,..., Ym to the scanning lines 112 in the 1, 2,. Supply. Specifically, the scanning line driving circuit 4 exclusively selects the scanning lines 112 in the order of the first, second,..., Mth rows, and supplies an H (High) level signal to the selected scanning lines 112. Then, an L (Low) level signal is supplied to the unselected scanning line 112.

The data line drive circuit 5 is connected to each data line 114 of the display unit 3, and in accordance with a signal supplied from the controller 2, the data signal X1, X2,..., Xn are supplied. Note that the controller 2, the scanning line driving circuit 4, and the data line driving circuit 5 may be collectively defined as a control device of the electro-optical device 1.
Further, the controller 2, or the combination of the controller 2, the scanning line driving circuit 4, and the data line driving circuit 5 can be defined as initialization means of the electro-optical device in order to initialize the display unit 3.

  FIG. 3 is a diagram illustrating a configuration of the pixel circuit 110. FIG. 3 shows the pixel circuit 110 in the first row and the first column. Since the configuration of each pixel circuit 110 is the same, the pixel circuit 110 in the first row and the first column will be described here representatively, and the description of the other pixel circuits 110 will be omitted.

  In the pixel circuit 110, the gate of the TFT 131 is connected to the scanning line 112, and the source of the TFT 131 is connected to the data line 114. The drain of the TFT 131 is connected to the pixel electrode 13a. The pixel electrode 13 a faces the common electrode layer 32, and the electrophoretic layer 20 is sandwiched between the pixel electrode 13 a and the common electrode layer 32. The microcapsule 21 between the one pixel electrode 13 a and the common electrode layer 32 becomes one pixel 100 in the display unit 3. In the pixel circuit 110, a storage capacitor C <b> 1 is connected in parallel with the electrophoretic layer 20. The potential of the common electrode layer 32 is set to a predetermined potential Vcom.

(Pixel driving method)
Next, a method for driving the pixel 100 will be described. First, when one scanning line 112 is selected by the scanning line driving circuit 4 and the selected scanning line 112 becomes H level, the TFT 131 having the gate connected to the scanning line 112 is turned on, and the pixel electrode 13a is set to the data. Connected to line 114. For this reason, when a data signal is supplied to the data line 114 when the scanning line 112 is at the H level, the data signal is applied to the pixel electrode 13a via the TFT 131 which is turned on. When the scanning line 112 becomes L level, the TFT 131 is turned off, but the voltage applied to the pixel electrode 13a by the data signal is accumulated in the storage capacitor C1, and the potential of the pixel electrode 13a and the potential of the common electrode layer 32 are Electrophoretic particles move according to the potential difference (voltage).
For example, when the potential of the pixel electrode 13a is higher than the potential Vcom of the common electrode layer 32 (for example, + 15V), the negatively charged white electrophoretic particles move toward the pixel electrode 13a and are charged positively. The black electrophoretic particles are moved to the common electrode layer 32 side, and the pixel 100 displays black. In addition, when the potential of the pixel electrode 13a is lower than the potential Vcom of the common electrode layer 32 (for example, −15V), the positively charged black electrophoretic particles move to the pixel electrode 13a side and become negative. The charged white electrophoretic particles move to the common electrode layer 32 side, and the pixel 100 displays white. Note that since the pixel 100 has a memory property, a black or white display state is maintained even when application of a voltage to the pixel electrode 13a is stopped.

(Initialization processing of display unit 3)
Next, an initialization process performed before displaying a new image on the display unit 3 in the present embodiment will be described. FIGS. 4A and 4B are enlarged views of a part of the image displayed on the display unit 3 during the initialization process. 4 (a) and 4 (b) are enlarged views of the area of the pixels 100 corresponding to 10 rows in the column direction and 10 columns in the row direction from the pixel 100 in the first row and first column.

  First, in the first step of the initialization process, the controller 2 is a video signal that defines the display state of the pixels 100, and displays the pixels 100 in odd rows and odd columns in black, and in odd rows and even columns. A data line driving circuit generates a video signal for displaying white pixels 100 in the white line and a video signal for displaying pixels 100 in the even number rows and odd columns in white and the black pixels 100 in even number rows and even columns. 5 is supplied. For example, when viewing the pixel 100 in the first row, the odd-numbered data lines 114 are at the H level and the even-numbered data lines 114 are at the L level during the period in which the scanning line 112 in the first row is at the H level. Thus, a voltage higher than the voltage Vcom of the common electrode layer 32 is applied to the pixel electrode 13a of the odd-numbered pixel circuit 110 in the first row during the period in which the TFT 131 is on, and a voltage lower than the common electrode layer 32 is 1 This is applied to the pixel electrode 13a of the pixel circuit 110 in the even column in the row. When the voltage of the pixel electrode 13a becomes higher than the voltage of the common electrode layer 32, the black electrophoretic particles move to the common electrode layer 32 side, and as shown in FIG. When 100 becomes black and the voltage of the pixel electrode 13a becomes lower than the voltage of the common electrode layer 32, the white electrophoretic particles move to the common electrode layer 32 side, and as shown in FIG. In the eye, even-numbered pixels 100 are white.

  Looking at the pixel 100 in the second row, after the scanning line 112 in the first row becomes L level, the odd-numbered data lines 114 become L level in a period in which the scanning line 112 in the second row is at H level. The data lines 114 in the even columns are at the H level. Thus, a voltage lower than the voltage Vcom of the common electrode layer 32 is applied to the pixel electrode 13a of the odd-numbered pixel circuit 110 in the second row during the period in which the TFT 131 is on, and a voltage higher than the common electrode layer 32 is 2 This is applied to the pixel electrode 13a of the pixel circuit 110 in the even column in the row. When the voltage of the pixel electrode 13a becomes lower than the voltage of the common electrode layer 32, white electrophoretic particles move to the common electrode layer 32 side, and the pixels 100 in the odd-numbered columns in the second row become white, and the pixel electrode 13a When the voltage becomes higher than the voltage of the common electrode layer 32, the black electrophoretic particles move to the common electrode layer 32 side, and the pixels 100 in the even-numbered columns become black in the second row.

That is, in the first step, each of the odd-numbered and odd-numbered pixels 100 and each of the even-numbered and even-numbered pixels 100 becomes the first region, and each of the odd-numbered and odd-numbered pixels 100 and each of the even-numbered and even-numbered pixels 100. Each becomes a second region, and the first region and the second region have different gradations.
In addition, after the first step is completed in this way, black pixels and white pixels are alternately arranged in the row direction and the column direction on the display unit 3, and a checkered pattern is displayed. In this embodiment, since the area of one pixel 100 is very small, a minute black area and a minute white area are alternately arranged on the display unit 3, and black and white are visible to human eyes. Is visible as a mixed gray.

  Next, in the second step of the initialization process, the controller 2 displays a video signal for displaying the pixels 100 in the odd rows and the odd columns in white, and displaying the pixels 100 in the odd rows and the even columns in black. A video signal for displaying the pixels 100 in the even rows and the odd columns in black and supplying the pixels 100 in the even rows and the even columns in white is supplied to the data line driving circuit 5. For example, when viewing the pixel 100 in the first row, the odd-numbered data lines 114 are at the L level and the even-numbered data lines 114 are at the H level during the period in which the scanning line 112 in the first row is at the H level. Thus, a voltage lower than the common electrode layer 32 is applied to the pixel electrodes 13a of the odd-numbered pixel circuit 110 in the first row during a period in which the TFT 131 is on, and a voltage higher than the common electrode layer 32 is applied to the first row. It is applied to the pixel electrode 13a of the pixel circuit 110 in the even column. When the voltage of the pixel electrode 13a becomes lower than the voltage of the common electrode layer 32, the white electrophoretic particles move to the common electrode layer 32 side, and the pixels 100 in the odd columns in the first row become white, and the pixel electrode 13a When the voltage becomes higher than the voltage of the common electrode layer 32, the black electrophoretic particles move to the common electrode layer 32 side, and the pixels 100 in the even-numbered columns become black in the first row.

  Looking at the pixel 100 in the second row, after the scanning line 112 in the first row becomes L level, the odd-numbered data lines 114 become H level in a period in which the scanning line 112 in the second row is at H level. The data lines 114 in the even columns are at the L level. Accordingly, a voltage higher than the common electrode layer 32 is applied to the pixel electrode 13a of the pixel circuit 110 in the odd-numbered column in the second row while the TFT 131 is on, and a voltage lower than the common electrode layer 32 is applied to the second row. It is applied to the pixel electrode 13a of the pixel circuit 110 in the even column. When the voltage of the pixel electrode 13a becomes higher than the voltage of the common electrode layer 32, the black electrophoretic particles move to the common electrode layer 32 side, and the pixels 100 in the odd-numbered columns in the second row become black. When the voltage becomes lower than the voltage of the common electrode layer 32, the black electrophoretic particles move to the common electrode layer 32 side, and the pixels 100 in the even-numbered columns become white in the second row.

That is, in the second step, each of the odd-numbered and odd-numbered pixels 100 and each of the even-numbered and even-numbered pixels 100 becomes the first region, and each of the odd-numbered and odd-numbered pixels 100 and each of the even-numbered and even-numbered pixels 100. Each becomes a second area, and the first area and the second area have gradations different from those of the first step.
In addition, after the second step is finished, black pixels and white pixels are alternately arranged in the row direction and the column direction in the display unit 3, and a checkerboard pattern is displayed, and black and white are displayed to human eyes. Visible as a mixed gray. As described above, since a gray image is visually recognized during the initialization process, the image changes during the initialization process as compared with the case where all the pixels are set to white after all the pixels are set to black during the initialization process. It becomes difficult to be visually recognized, and the user is less likely to feel uncomfortable during the initialization process. Further, by performing the first step and the second step in the initialization process, the black electrophoretic particles and the white electrophoretic particles move between the pixel electrode 13a and the common electrode layer 32 in each pixel 100 and are agitated. Therefore, the afterimage becomes difficult to be visually recognized after the initialization process is completed.

  When the second step is completed, a video signal representing an image to be newly displayed is supplied from the controller 2 to the data line driving circuit 5, and a new image is displayed on the display unit 3. When a new image is displayed, the voltage applied to the pixel electrode 13a is applied to the pixel electrode 13a for the pixel 100 whose display does not change after the second step is completed, utilizing the fact that the pixel 100 has a memory property. The voltage is the same as the voltage Vcom applied to.

  When the checkerboard pattern in FIG. 4B is changed to a new image, a pixel 100 that changes from white to black, a pixel 100 that changes from black to white, and a pixel 100 that does not change the display state are generated. Here, when the second step of FIG. 5A is completed, for example, when the first to fifth columns are black and the sixth to tenth columns are white and the state of FIG. When attention is paid to the boundary portion between the display area and the white display area, there is a pixel that changes from black to white in the sixth column (odd-row pixels in the sixth column). When the image of FIG. 5B is displayed, black electrophoretic particles are attracted to the pixel electrode 13a side in the odd-numbered row of the sixth column. Compared with the case where all of the pixels 100 display an image from a white state, the area that is visually recognized as black is actually black when there are few black electrophoretic particles that move to the common electrode layer 32 side as the electrophoretic particles move. It will not be wider than the area to be.

  In addition, when no new image is displayed after the initialization process, the electrophoretic particles move as time passes. Here, in the conventional initialization process for making all pixels black or white, the pixels are displayed in white or black to gray due to the movement of black and white electrophoretic particles, and the change in the initialized screen is changed by the user. However, in this embodiment, when the initialization process is completed, the screen is visually recognized by the user as gray, so even if the checkered black and white pixels are displayed in gray. Initialized screen changes are less visible to the user.

[Electronics]
Next, an example of an electronic apparatus to which the electro-optical device according to the above-described embodiment is applied will be described. FIG. 6 is a diagram illustrating an appearance of an electronic book reader using the electro-optical device. The electronic book reader 1000 includes a plate-shaped frame 1001, buttons 9A to 9F, and the electro-optical device according to the above-described embodiment or modification. However, in the figure, only the display unit 3 of the electro-optical device is exposed. In the electronic book reader 1000, the contents of the electronic book are displayed on the display unit 3, and the pages of the electronic book are turned by operating the buttons 9A to 9F.
In addition to this, examples of the electronic apparatus to which the electro-optical device according to the above-described embodiments and modifications can be applied include a watch, electronic paper, an electronic notebook, a calculator, a mobile phone, and the like.

[Modification]
As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above, It can implement with another various form. For example, the present invention may be implemented by modifying the above-described embodiment as follows. In addition, you may combine each of embodiment mentioned above and the following modifications.

In the embodiment described above, the image of FIG. 4A is displayed in the first step and the image of FIG. 4B is displayed in the second step in the initialization process. The image of FIG. 4B may be displayed in one step, and the image of FIG. 4A may be displayed in the second step.
In the present invention, all the pixels 100 may be set to black after the all-pixels 100 are black in the initialization process, and then the image of FIG. 4A or 4B may be displayed. When all the pixels 100 are set to black and then all the pixels 100 are set to white, and thereafter the images of FIGS. 4A and 4B are alternately displayed and the initialization process is completed, the processing shown in FIG. The image shown in FIG. 4B may be displayed.
In the embodiment described above, the ratio of the black pixel 100 to the white pixel 100 is 50:50 in the image in FIG. 4A and the image in FIG. In the case of halftone, the ratio of the black pixel 100 to the white pixel 100 in the image displayed during the initialization process is not limited to 50:50, and may be other ratios. .

  In the above-described embodiment, a checkerboard pattern is displayed during the initialization process, but an image displayed during the initialization process is not limited to the checkerboard pattern. For example, in the first step, as shown in FIG. 7A, a striped pattern image in which the odd-numbered pixels 100 are black and the even-numbered pixels 100 are white is displayed, and in the second step, FIG. As shown in b), a striped pattern image may be displayed in which the odd-numbered pixels 100 are white and the even-numbered pixels 100 are black. In the first step, a striped pattern image is displayed in which the odd-numbered pixels 100 are black and the even-numbered pixels 100 are white, and in the second step, the odd-numbered pixels 100 are white and the even-numbered pixels 100. It may be configured to display a striped pattern image with black as a black line.

In the embodiment described above, black and white are alternately adjacent to each other during the initialization process. For example, in the initialization process, two rows are provided as shown in FIG. A display in which the pixels 100 are alternately black and white, and the pixels 100 are alternately black and white in two columns, and as shown in FIG. 8B, the black portion is white in FIG. In 8 (a), the display in which the white portion is black may be displayed in order. In this way, power consumption can be suppressed because the number of potential transitions of the data line 114 is reduced as compared with a configuration in which black and white are alternately adjacent to each other.
Further, in the initialization process, for example, as shown in FIG. 9A, a first pixel in which pixels in 2 rows and 2 columns are one block, three pixels 100 in one block are black, and the remaining one is white. After the block B1 and the second block B2 in which the three pixels 100 in one block are white and the remaining one is black are displayed in the vertical and horizontal directions, the first block is displayed as shown in FIG. 9B. It is good also as a structure which replaces the position of block B1 and 2nd block B2. In this way, as compared with the configuration in which black and white are alternately adjacent one by one, irregularity of the arrangement of the first area and the second area during the initialization process increases, so that an afterimage is more difficult to see. can do.

  Further, in the present invention, as shown in FIG. 10A, in the first step, the odd-numbered pixels 100 and the odd-numbered columns 100 are black, the even-numbered pixels 100 and the even-numbered pixels 100 are white, In the second step, as shown in FIG. 10B, the odd-numbered pixels 100 and the odd-numbered pixels 100 may be white, and the even-numbered pixels 100 and the even-numbered pixels 100 may be black. Thus, even if the areas of the first region and the second region are different, the same effect as in the above embodiment can be obtained. In addition, even if the first step and the second step are not in a reversed display relationship or there are pixels in which the display does not change between the first step and the second step, The same effect as the above embodiment can be obtained.

In the present invention, the image to be displayed during the initialization process may be switched according to the remaining amount of the rechargeable battery serving as the power source of the electronic book reader 1000. For example, when the remaining amount of the rechargeable battery is equal to or greater than a predetermined threshold, the image shown in FIG. 4A and the image shown in FIG. When the remaining amount is less than the threshold value, the image shown in FIG. 8A and the image shown in FIG. 8B may be displayed.
In the present invention, the image displayed during the initialization process may be changed according to the content of the image displayed before the initialization process. For example, when a character string is displayed, if the font size is equal to or smaller than a predetermined size, the image shown in FIG. 4A and the image shown in FIG. If the font size exceeds a predetermined size, the image shown in FIG. 8A and the image shown in FIG. 8B may be displayed in the initialization process. . In this manner, the number of potential transitions of the data line 114 can be minimized and power consumption can be reduced in a range where the afterimage of the image displayed before the initialization process can be hardly viewed. Can be reduced.

  In the above-described embodiment, the image of FIG. 4A is displayed once and then the image of FIG. 4B is displayed once. However, the display of FIG. It is good also as a structure which performs the display of b) alternately several times. Further, the period from the selection of the scanning line 112 of the first row to the completion of the selection of the scanning line 112 of the m-th row is one frame, and each image is displayed so that the image of FIG. A voltage may be applied to the data line 114, and the voltage may be applied to each data line 114 so that the image of FIG.

  In the embodiment described above, the ratio of the black pixel 100 to the white pixel 100 in FIGS. 4A and 4B is fixed at 50:50, but this ratio may be changeable. . For example, when the characteristics of the pixels 100 are measured and a black region is likely to expand when an image is newly displayed from a state in which all the pixels 100 are white, the pixels 100 that are white in the image displayed during initialization are displayed. You may make it a ratio increase.

  In the embodiment described above, the image displayed in the first step and the image displayed in the second step in the initialization process have the same ratio of black pixels to white pixels. The ratio of black pixels may be increased, or the ratio of white pixels may be increased step by step.

  In the present invention, in the first step, the odd-numbered and odd-numbered pixels 100 in the upper half of the display unit 3 are white, the odd-numbered and even-numbered pixels 100 are black, the even-numbered and odd-numbered columns. Pixel 100 is black, even row and even column pixel 100 is white, odd row and odd column pixel 100 is black, odd row and even column pixel 100 is white, even The pixels 100 in rows and odd columns may be white, and the pixels 100 in even rows and even columns may be black. In the second step, the odd-numbered and odd-numbered pixels 100 in the upper half of the display unit 3 are black, the odd-numbered and even-numbered pixels 100 are white, the even-numbered and odd-numbered pixels 100 are white. The pixels 100 in the even rows and the even columns are black, and the pixels 100 in the odd rows and the odd columns in the lower half of the display unit 3 are white, the pixels 100 in the odd rows and the even columns are black, the pixels in the even rows and the odd numbers The pixels 100 in the columns may be black, and the pixels 100 in the even rows and even columns may be white.

  In the present invention, in the first step, the pixels 100 in the odd rows and the odd columns in the left half of the display unit 3 are white, the pixels 100 in the odd rows and the even columns are black, the pixels 100 in the even rows and the odd columns The pixels 100 in the even rows and the even columns are white, the pixels 100 in the odd rows and the odd columns in the right half of the display unit 3 are black, the pixels 100 in the odd rows and the even columns are white, The pixels 100 in even rows and odd columns may be white, and the pixels 100 in even rows and even columns may be black. In the second step, the odd-numbered and odd-numbered pixels 100 in the left half of the display unit 3 are black, the odd-numbered and even-numbered pixels 100 are white, the even-numbered and odd-numbered pixels 100 are white. The pixels 100 in the even rows and the even columns are black, and the pixels 100 in the odd rows and the odd columns in the right half of the display unit 3 are white, the pixels 100 in the odd rows and the even columns are black, the pixels in the even rows and the odd numbers The pixels 100 in the columns may be black, and the pixels 100 in the even rows and even columns may be white.

  In each of the above-described embodiments and modifications, the electro-optical device 1 is an electrophoretic device, in which black electrophoretic particles and white electrophoretic particles are enclosed in a microcapsule 21, and pixels facing each other. Although the microcapsule system is one in which the microcapsule 21 is disposed between the electrode 13a and the common electrode layer 32, the electro-optical device is not limited to the microcapsule system. For example, the electro-optical device according to the present invention may be a horizontal electrophoresis system. In addition, the electro-optical device according to the present invention may be a system using an electronic powder fluid (registered trademark) or a charged toner type system.

DESCRIPTION OF SYMBOLS 1 ... Electro-optical device, 2 ... Controller, 3 ... Display part, 4 ... Scanning line drive circuit, 5 ... Data line drive circuit, 9A-9F ... Button, 10 ... 1st board | substrate, 11 ... Board | substrate, 11a ... Adhesion layer, DESCRIPTION OF SYMBOLS 12 ... Circuit layer, 13a ... Pixel electrode, 20 ... Electrophoresis layer, 21 ... Microcapsule, 22 ... Binder, 30 ... 2nd board | substrate, 31 ... Film, 32 ... Common electrode layer, 100 ... Pixel, 112 ... Scanning line, 110: pixel circuit, 114 data lines, 131: TFT, B1: first block, B2: second block, C1: auxiliary capacitance

Claims (7)

A method of driving an electro-optical device including a display unit including a plurality of pixels provided with charged particles between a first electrode and a second electrode paired with the first electrode,
The initialization processing for initializing the pixels of the display unit includes gradations of pixels in the first region among the first region and the second region that are adjacent to each other in the display unit and each include one or a plurality of the pixels. And the final step of changing the gradation of the pixels in the second region to make the display unit a halftone of the area gradation. In the initialization process, the gradation of the pixel in the first region is set to a gradation different from the gradation in the final step, while the gradation of the pixel in the second region is different from the gradation in the final step. The method according to claim 1, further comprising: a step before the final step. The pixels are arranged in a matrix;
A pixel circuit for determining a display state of the pixel for each pixel;
A scanning line is provided for each row of the pixel circuit,
A data line is provided for each column of the pixel circuits,
The driving method of the electro-optical device according to claim 1, wherein the first region and the second region are regions along a direction in which the data line extends. The size of the first area and the second area is changed in the initialization process according to an image displayed on the display unit before the initialization process. The method for driving an electro-optical device according to claim 3. A control device for an electro-optical device comprising a display unit having a plurality of pixels provided with charged particles between a first electrode and a second electrode paired with the first electrode,
The gray level of the pixel in the first area and the gray level of the pixel in the second area of the first area and the second area, which are adjacent to each other and are each composed of one or a plurality of the pixels in the display unit, are different. An electro-optical device control apparatus comprising: an initialization unit that finishes initialization of pixels of the display unit in a process of making the display unit a halftone of area gradation. An electro-optical device including a display unit including a plurality of pixels provided with charged particles between a first electrode and a second electrode paired with the first electrode,
The gray level of the pixel in the first area and the gray level of the pixel in the second area of the first area and the second area, which are adjacent to each other and are each composed of one or a plurality of the pixels in the display unit, are different. Then, the initialization of the pixels of the display unit is completed by the process of making the display unit a halftone of the area gradation.   An electronic apparatus comprising the electro-optical device according to claim 6.

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