JP5163182B2 - Image rewriting control device and information display device - Google Patents

Description

  The present invention relates to a technique for rewriting an image in an information display device.

  An information display device using a memory display element such as an electrophoretic display element is known. Since the memory-type display element does not require refresh driving for holding the display, it has a display quality close to that of paper and is easy on the eyes. Taking advantage of these features, devices called electronic books or electronic papers have been developed that can be used to read relatively long documents.

  The image displayed on the electronic paper is rewritten according to a user instruction. For example, Patent Document 1 discloses a method of rewriting display contents in an electrophoretic display device. However, according to the method described in Patent Document 1, an afterimage may be generated on the display unit. As a technique for reducing afterimages, a technique described in Patent Document 2 is known. Patent Document 2 discloses performing rewriting by a plurality of driving steps, such as providing a period during which the display unit is white and a period during which the display unit is black.

JP 2002-149115 A JP 2007-206471 A

  When the step of erasing the first image is executed when the rewriting process from the first image to the second image is performed, the rewriting process requires at least a time required for erasing the first image. . That is, the next page rewriting is not performed until the rewriting process of a certain page is completed. In particular, in a memory-type display device, it takes a relatively long time to erase an image, which is a factor that hinders rewriting speed. However, simply shortening the time for erasing the image causes an afterimage, resulting in a deterioration in display quality.

  In contrast, the present invention provides a technique that achieves both high-speed rewriting and improved display quality.

The present invention rewrites an image to be displayed on a display device from a first image to a second image by executing one rewriting process among a plurality of rewriting processes including a normal rewriting process, a high-speed rewriting process, and an overwriting process. Rewriting means, wherein the normal rewriting process writes the second image to the display device after the first erasing step for erasing the first image from the display device and the first erasing step. After a second erasing step and a second erasing step, wherein the high-speed rewriting process includes erasing the first image from the display device in a period shorter than the first erasing step. A second writing step of writing the second image on the display device, wherein the overwriting process includes the second writing step on the display device. A rewriting unit including a third writing step of further writing at least a part of the second image on the display device in a state where the image is displayed; and a rewriting instruction from the first image to the second image. The rewriting process is executed so that one rewriting process among the plurality of rewriting processes is executed based on at least one of the timing, the instruction from another device, and the first image or the second image. An image rewrite control device having control means for controlling rewrite means is provided.
According to this image rewrite control device, one of a plurality of rewrite processes is performed based on the timing at which a rewrite instruction is given, an instruction from another device, and at least one of the first image and the second image. One rewrite process is executed.

In a preferred aspect, when the high-speed rewriting process is continuously performed a predetermined number of times or more, the control unit erases the first image from the display device using a period longer than the second erasing step. The rewriting means may be controlled to execute a rewriting process including an erasing step.
According to this image rewriting control device, when the high-speed rewriting process is continuously performed a predetermined number of times or more, the rewriting process including an erasing step having a long period is executed.

In another preferable aspect, the plurality of rewriting processes include a reset process including a third erasing step of erasing the first image from the display device using a period longer than the first erasing step, When the high-speed rewriting process is continuously performed a predetermined number of times or more, the control unit may control the rewriting unit to execute the reset process.
According to this image rewriting control device, when the high-speed rewriting process is continuously performed a predetermined number of times or more, the reset process is executed.

In still another preferred aspect, when the next rewriting instruction is not performed even after a reference time has elapsed since the rewriting instruction is performed, the control unit controls the rewriting unit to execute the overwriting process. May be.
According to this image rewriting control device, when the next rewriting instruction is not performed even after the reference time has elapsed since the rewriting instruction is performed, the overwriting process is executed.

In still another preferred aspect, the reference time may be determined based on a time obtained by statistically processing the timings of a plurality of rewriting instructions performed in the past in the image rewriting device.
According to this image rewrite control device, the rewrite instruction timing is determined according to the statistical processing result.

In still another preferred embodiment, at least one of the data indicating the first image and the data indicating the second image has information indicating the reference time, and the reference time is determined by the information. It may be determined for each image based on the indicated time.
According to this image rewriting control device, the reference time is determined based on at least one of the first image and the second image.

In still another preferred aspect, the reference time may be determined based on a data amount of the first image or the second image.
According to this image rewriting control device, the reference time is determined based on at least one of the first image and the second image.

In still another preferred aspect, at least one of the data indicating the first image and the data indicating the second image includes information indicating which rewriting process should be executed among the plurality of rewriting processes. The control unit may control the rewriting unit to execute a rewriting process determined for each image based on the information.
According to this image rewrite control device, which rewrite process should be performed is determined based on at least one of the first image and the second image.

The present invention also provides an information display device comprising the image rewrite control device according to any one of the above items and the display device driven by the image rewrite control device.
According to this information display device, one of a plurality of rewrite processes is performed based on at least one of a timing when a rewrite instruction is given, an instruction from another device, and the first image or the second image. Rewrite processing is executed.

1. Configuration FIG. 1 is a diagram showing a functional configuration of an information display apparatus 1 according to an embodiment of the present invention. The operation means 20 outputs a signal corresponding to a user operation. The interrupt processing unit 30 outputs an interrupt signal for instructing generation of an image to be displayed to the image generation unit 40 in accordance with the signal output from the operation unit 20. The image generation unit 40 generates image data indicating an image (page image) to be displayed in response to the interrupt signal, and stores the generated image data in the storage unit 50. Further, the image generation means 40 outputs a command for causing the display device 60 to display an image to the image rewrite control device 10. Upon receiving this command, the image rewrite control device 10 reads the image data from the storage unit 50 and causes the display device 60 to display an image according to the image data.

  The image rewriting control device 10 is a device that controls image rewriting on the display device 60, that is, a device that supplies image data to the display device 60 and drives the display device 60. The image rewrite control device 10 has the following configuration in detail. The rewriting means 11 executes one rewriting process among a plurality of rewriting processes including a normal rewriting process, a high-speed rewriting process, and an overwriting process, thereby changing the image to be displayed on the display device 60 from the first image to the second image. Rewrite to. Here, the “normal rewriting process” includes a first erasing step for erasing the first image from the display device 60 and a first writing step for writing the second image to the display device 60 after the first erasing step. Is a rewriting process including The “high-speed rewriting process” is performed after the second erasing step and the second erasing step in which the first image is erased from the display device 60 by using a period shorter than the first erasing step (over a short time). The rewriting process includes a second writing step of writing a second image on the display device 60. The “overwriting process” is a rewriting process including a third writing step of further writing at least a part of the second image on the display device 60 in a state where the second image is displayed on the display device 60. The control means 12 controls the rewriting means so as to execute one rewriting process among a plurality of rewriting processes based on the timing when the rewriting instruction from the first image to the second image is given. Here, “writing an image” on the display device 60 means supplying image data to the display device 60 and displaying an image indicated by the image data.

  FIG. 2 is a diagram illustrating a hardware configuration of the information display device 1. In this example, the information display device 1 is electronic paper. A CPU (Central Processing Unit) 101 is a control device that controls components of the information display device 1. A ROM (Read Only Memory) 102 is a non-volatile storage device that stores programs and data necessary for starting the information display device 1. A RAM (Random Access Memory) 103 is a storage device that functions as a work area when the CPU 101 executes a program. A video random access memory (VRAM) 104 is a storage device that stores data indicating an image to be displayed on the display body 107 (hereinafter referred to as “main image”). The VRAM 104 has a main image storage area, and the main image is stored in the storage area. An I / O (Input / Output) 105 is an interface for managing input / output of data and signals. A UI (User Interface) button group 106 is a device that outputs a signal according to a user's operation, for example, a button (rewrite button, page feed button, determination button, etc.), keypad, wheel, lever, touch panel, pen. This is an input device including an operator such as a device. The auxiliary storage device 115 is a storage device that stores data (document data) that can be displayed on the display unit 107. The UI button group 106 is connected to the I / O 105, and a signal output from the UI button group 106 is input to the CPU 101 via the I / O 105. The timer T is a time measuring device that outputs a signal indicating time.

  The display body 107 is an electrophoretic display (hereinafter referred to as “EPD”) having an electrophoretic display element which is a memory display element. The display control unit 108 is a device that outputs a signal for performing drawing control of the display body 107. Hereinafter, the display body 107 and the display control unit 108 are collectively referred to as “main display” as necessary. The power on / off circuit 111 is a circuit for supplying and stopping power supply to elements such as the display control unit 108 and the CPU 101. Hereinafter, supplying power to a certain component is referred to as “turning on the power”, and stopping supplying power is referred to as “turning off the power”. The power control unit 112 is a device that performs power management of the information display device 1. Specifically, the power control unit 112 controls the power on / off circuit 111 to turn on or off the power of the display control unit 108 and the CPU 101. Further, the power control unit 112 monitors the remaining amount of the battery 113. The battery 113 supplies power to the components of the information display device 1 such as the display control unit 108, the CPU 101, and the RAM 103. The bus 114 is a transmission path used for signal transmission between components.

  The fingerprint sensor 117 is a device that electrostatically reads a user's fingerprint and outputs a signal indicating an image of the read fingerprint. The fingerprint sensor 117 is connected to the I / O 105, and a signal output from the fingerprint sensor 117 is input to the CPU 101 via the I / O 105.

  The ROM 102 stores a control program for performing processing described below. The function shown in FIG. 1 is implemented in the information display device 1 by the CPU 101 executing this control program. Here, the display control unit 108 is an example of the image rewrite control device 10, the UI button group 106 and the fingerprint sensor 117 are examples of the operation unit 20, and the CPU 101 is an example of the interrupt processing unit 30 and the image generation unit 40. The VRAM 104 is an example of the storage unit 50, and the display body 107 is an example of the display device 60.

  FIG. 3 is a diagram illustrating an appearance of the information display device 1. The information display device 1 includes a display surface of the display body 107 and a UI button group 106 on the front surface of the housing. The UI button group 106 includes a high quality display button 106a and a page feed button 106b.

2. Operation Prior to the description of the operation, a usage scene of the information display device 1 will be described. The displayed document is composed of images of a plurality of pages, but the user does not necessarily want to read all of the information described on each page. The user browses the document in a so-called flow-reading manner, that is, browses images of a plurality of pages in order in a short time so as not to read all of the described information. The user finds a page that seems to be particularly important from them, and browses the page for a long time. In other words, the user uses different types of reading and fine reading according to the situation. The information display device 1 corresponds to such a usage scene.

  FIG. 4 is a flowchart showing the operation of the information display device 1. The flow in FIG. 4 is started when the display of a document is instructed by the user.

In step S100, the CPU 101 initializes a variable (display image number n) indicating a page to be displayed on the display body 107 as n = 1.
In step S <b> 110, the CPU 101 controls the display control unit 108 to display the n-th page image on the display body 107. The rewriting process performed at this time is a high-speed rewriting process.

  5 and 6 are diagrams illustrating normal rewrite processing and high-speed rewrite processing. In these drawings, a timing chart showing a change in voltage applied to the common electrode and the pixel electrode A-C and a schematic diagram of an image displayed on the display body 107 at this time are described. Since the display element of the display body 107, that is, the structure of each pixel is well known, detailed description is omitted here, but data corresponding to the potential difference between the common pixel and the pixel electrode is written in each pixel. The pixel electrodes A to C are pixel electrodes of the pixels A to C, respectively. The pixel A is a pixel whose gradation is black in the first image and whose gradation is white in the second image. The pixel B is a pixel whose gradation is white in both the first image and the second image. The pixel C is a pixel whose gradation is black in both the first image and the second image.

Here, a case where the first image, that is, the image before rewriting is an alphabet “H” image, and the second image, that is, the image after rewriting is an “I” image will be described as an example. In the normal rewriting process, the first erasing step includes a step of writing an inverted image of the first image and a step of writing a full-screen black image. In the high-speed rewriting process, the second erasing step includes a step of writing a reverse image of the first image. Here, the time t ₁ required for the first erase step and the time t ₂ required for the second erase step satisfy t ₂ <t ₁ . That is, the period of the second erase step is shorter than the period of the first erase step.

  Comparing the normal rewriting process and the high-speed rewriting process, the high-speed rewriting is inferior to the normal rewriting process from the viewpoint of erasing the afterimage. FIG. 6 illustrates a state in which an “H” image is not completely erased and an afterimage is generated during the reverse erasure period. Further, when the period of the second writing step is shorter than the period of the first writing step, the high-speed rewriting has inferior image quality from the normal rewriting process from the viewpoint of contrast. However, if the second image can be roughly read even if the image quality is inferior from the standpoint of afterimage or contrast, there is no problem in the use of flow-reading.

A description will be given with reference to FIG. 4 again. In step S120, the CPU 101 starts counting of the overwrite timer. The “overwrite timer” is a timer used to determine the timing for starting the overwriting process.
In step S130, the CPU 101 determines whether an interrupt has occurred. Here, “interrupt” refers to an event instructing update of an image to be displayed, that is, generation of an image to be newly displayed. In this example, the interrupt is an event that the page feed button 106b of the UI button group 106 has been pressed, and does not correspond to an interrupt when an operator other than the page feed button 106b is operated. If it is determined that an interrupt has occurred (S130: YES), the CPU 101 proceeds to step S140. If it is determined that no interrupt has occurred (S130: NO), the CPU 101 proceeds to step S160.

In step S140, the CPU 101 stops counting of the overwrite timer. Further, the CPU 101 initializes the value of the overwrite timer to zero.
In step S150, the CPU 101 updates the display image number n as n = n + 1. When the process of step S150 is completed, the CPU 101 repeatedly executes the process from step S110.

In step S160, the CPU 101 counts up the overwrite timer.
In step S170, the CPU 101 determines whether the overwrite timer has expired, that is, whether the value of the overwrite timer has exceeded the reference time (threshold value). When it is determined that the time is not up (S170: NO), the CPU 101 shifts the processing to step S130. When it is determined that the time is up (S170: YES), the CPU 101 controls the display control unit 108 to display the image of the nth page on the display body 107 in step S180. The rewriting process performed at this time is an overwriting process.

  FIG. 7 is a diagram illustrating the overwriting process. In the overwriting process, the third writing step is composed of a white writing step for writing white data to a pixel having a gradation of white and a black writing step for writing black data to a pixel having a gradation of black. The This is intended to reduce afterimages and improve contrast.

  As described above, according to the information display apparatus 1, since the page rewriting is performed by the high-speed rewriting process, the rewriting speed can be increased. Also, in situations where it is determined that the user is reading carefully according to the timing of the rewriting instruction, more specifically, the interval of the rewriting instruction, overwriting is performed to improve the image quality. High image quality is achieved.

3. Other Embodiments The present invention is not limited to the above-described embodiments, and various modifications can be made. Hereinafter, some modifications will be described. In the description of the modification, common reference symbols are used for elements that are common to the embodiment. Two or more of the modifications described below may be used in combination.

3-1. Modification 1
FIG. 8 is a flowchart showing the operation of the information display device 1 according to the first modification. Modification 1 shows an example in which the overwriting process is started when the user presses the high quality display button 106a. That is, instead of the overwrite timer described in the flow of FIG. 4, a user operation (more specifically, an instruction from the CPU 101 according to a signal from the UI button group 106) is used as a trigger for starting the overwrite process. In FIG. 8, a common code is assigned to a process common to FIG.

When the process of step S110 is completed, the CPU 101 shifts the process to step S200. In step S200, the CPU 101 determines whether an interrupt has occurred. In this example, “interrupt” refers to an event instructing update of an image to be displayed (page update), that is, generation of an image to be newly displayed, or an instruction instructing start of overwriting processing. “Page update” is an event that the page feed button 106b of the UI button group 106 is pressed, and “Overwrite” is an event that the high quality display button 106a is pressed. When it is determined that there is no interrupt (S200: None), the CPU 101 waits until an interrupt occurs. If it is determined that a page update interrupt has occurred (S200: page update), the CPU 101 proceeds to step S150. If it is determined that an overwrite interrupt has occurred (S200: Overwrite), the CPU 101 proceeds to step S180.
According to this example, the overwriting process is performed according to the user's operation.

3-2. Modification 2
When the high-speed rewriting process is continuously performed a predetermined number of times or more, the control unit 12 erases the first image from the display device using a period longer than the second erasing step (that is, taking a long time). The rewriting unit 11 may be controlled to execute a rewriting process including an erasing step. If high-speed rewrite processing is performed continuously, afterimages may accumulate and readability of images in flow-reading may deteriorate, so rewrite processing other than high-speed rewrite processing (for example, normal rewrite processing) is performed periodically. This is intended to reduce the afterimage. In particular, the rewriting process used in this case may be a reset process. The reset process refers to a rewrite process including a third erasing step for erasing the first image from the display device 60 using a longer period than the first erasing step.

3-3. Modification 3
In the above-described embodiment, if the next rewrite instruction is not performed even after a predetermined reference time has elapsed since the last rewrite instruction, the rewrite unit 11 performs the overwriting process. An example of controlling the above has been described. However, the reference time may be variable. For example, the reference time may be determined based on a time obtained by statistically processing the timings of a plurality of rewrite instructions performed in the past in the image rewrite control device 10.

FIG. 9 is a diagram illustrating a statistical process according to the third modification. In FIG. 9, the horizontal axis indicates the interval between two consecutive rewrite instructions, and the vertical axis indicates the frequency. In this example, the rewrite instruction intervals are distributed so as to have a plurality of peaks. The spacing rewrite instruction when spacing rewrite instruction that the shortest peak flow reading, then the interval is long, at intervals of rewriting instruction when peak located at time t _p is that the intensive reading It is believed that there is. As described above, the CPU 101 statistically processes the interval between past rewrite instructions, and specifies the time (t _p ) at which the second peak appears from the shorter interval as the interval between rewrite instruction for fine reading. Further, the CPU 101 sets a time obtained by adding a predetermined margin (for example, 2 seconds) to the rewrite instruction interval as a reference time. According to this example, the reference time is dynamically set based on operations actually performed on the information display device 1 in the past.

  In this case, the interval of the rewriting instruction for fine reading is not limited to the time at which the second peak appears. For example, the CPU 101 may specify the peak appearing at the latest time as the interval for the rewriting instruction for fine reading. Further, the statistical processing is not limited to that shown in FIG. 9, and any statistical processing such as one using an average value or a mode value may be used.

3-4. Modification 4
In the third modification, the example in which the reference time is set according to the operation history has been described. However, the reference time may be set according to the image data to be processed. In this case, at least one of the first image data and the second image data (hereinafter referred to as “first image data” and “second image data”, respectively) has information indicating the reference time. Thus, the CPU 101 employs the time indicated by the information included in the first image data or the second image data as the reference time.

3-5. Modification 5
When the reference time is set according to the image data to be processed, the reference time may be determined based on the data amount of the first image or the second image. More specifically, the reference time may be set such that the longer the data amount is, the shorter the data amount is.

3-6. Modification 6
Which rewrite process should be executed among a plurality of rewrite processes that can be executed by the image rewrite control apparatus 10 may be determined according to the image data to be processed. In this case, the first image data or the second image data includes information indicating which rewriting process is to be executed among the plurality of rewriting processes. The control means 12 controls the rewriting means 11 to execute a rewriting process determined for each image based on this information. In this case, the control means 12 determines which rewriting process is to be executed according to the image data regardless of the timing of the rewriting instruction. The timing for performing the rewriting process is determined in advance. Alternatively, the control unit 12 may start the type of rewriting process determined according to the image data according to the timing of the rewriting instruction.
In short, as described in the embodiment and the modification example, the control unit 12 sets at least one of the timing at which the rewrite instruction is given, the instruction from another device, and the first image or the second image. Based on this, the rewriting means 11 is controlled to execute one rewriting process among the plurality of rewriting processes.

3-7. Modification 7
The functional configurations of the information display device 1 and the image rewrite control device 10 are not limited to those shown in FIG. The image rewrite control device 10 may have the functions described as those that the image rewrite control device 10 does not have, such as the interrupt processing unit 30 and the image generation unit 40. Further, the image rewrite control device 10 may not have a part of the functions described as the functions of the image rewrite control device 10. The setting of the reference time may be performed by the image rewrite control device 10 itself, or may be performed by an element other than the image rewrite control device 10. When an element other than the image rewrite control device 10 sets the reference time, a signal indicating the reference time is input to the image rewrite control device 10 (depending on the content or timing).

  Further, the correspondence between the functional configuration and the hardware configuration is not limited to that described in the above embodiment. For example, in the above-described embodiment, the CPU 101 has the functions as the interrupt processing unit 30, the image generation unit 40, and the operation mode determination unit 70. However, some or all of these functions are performed by hardware elements other than the CPU 101. It may be realized. For example, an interrupt monitoring circuit having a function as the interrupt processing unit 30 may be separately provided.

3-8. Other Modifications The hardware configuration of the information display device 1 is not limited to that shown in FIG. An apparatus having any hardware configuration may be used as long as the necessary functional configuration can be realized. In the above-described embodiment, the example in which the information display device 1 is electronic paper has been described. However, the information display device 1 may be a device other than electronic paper.
Further, the normal rewriting process and the high-speed rewriting process are not limited to those illustrated in FIGS. As long as the period of the erasing step of the high-speed rewriting process is shorter than the period of the erasing step of the normal rewriting process, any process may be used as the normal rewriting process and the high-speed rewriting process.

  In the above-described embodiment, the program executed by the CPU 101 includes a magnetic recording medium (magnetic tape, magnetic disk (HDD (Hard Disk Drive), FD (Flexible Disk), etc.)), and optical recording medium (optical disk (CD (Compact Disk)). , DVD (Digital Versatile Disk), etc.), magneto-optical recording medium, semiconductor memory (flash ROM, etc.) and the like. The program may be downloaded via a network such as the Internet.

It is a figure which shows the function structure of the information display apparatus 1 which concerns on one Embodiment. It is a figure which shows the hardware constitutions of the information display apparatus. 1 is a diagram illustrating an appearance of an information display device 1. FIG. 3 is a flowchart showing an operation of the information display device 1. It is a figure which illustrates normal rewriting processing. It is a figure which illustrates high-speed rewriting processing. It is a figure which illustrates an overwrite process. 10 is a flowchart showing an operation of the information display device 1 according to Modification 1. It is a figure which illustrates the statistical process which concerns on the modification 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Information display apparatus, 10 ... Image rewriting control apparatus, 11 ... Rewriting means, 12 ... Control means, 20 ... Operation means, 30 ... Interrupt processing means, 40 ... Image generation means, 50 ... Storage means, 60 ... Display apparatus, 101 ... CPU, 102 ... ROM, 103 ... RAM, 104 ... VRAM, 105 ... I / O, 106 ... UI button group, 107 ... display body, 108 ... display control unit, 111 ... power on / off circuit, 112 ... power source Control unit 113 ... battery 114 ... bus 115 ... auxiliary storage device 117 ... fingerprint sensor

Claims (8)

By executing one rewriting process among a plurality of rewriting processes including a normal rewriting process, a high-speed rewriting process, and an overwriting process, an image to be displayed on the display device using the memory display element is changed from the first image to the second image. Rewriting means for rewriting to the image of the image, wherein the normal rewriting process includes: a first erasing step for erasing the first image from the display device; and a second erasing device for the display device after the first erasing step. A second erasing step of erasing the first image from the display device in a shorter period of time than the first erasing step. A second writing step of writing the second image on the display device after the erasing step, wherein the overwriting process includes the display device; And rewriting means comprising a further third write step of writing at least a portion of said second image on said display device in a state in which the second image is displayed on,
Based on the timing at which a rewrite instruction from the first image to the second image is given, an instruction from another device, and at least one of the first image and the second image, Control means for controlling the rewriting means so as to execute one rewriting process among a plurality of rewriting processes,
When the high-speed rewriting process is continuously performed a predetermined number of times or more, the control unit includes an erasing step of erasing the first image from the display device using a period longer than the second erasing step. An image rewriting control apparatus for controlling the rewriting means so as to execute a rewriting process. The plurality of rewriting processes include a reset process including a third erasing step of erasing the first image from the display device using a longer period than the first erasing step;
The image rewrite control device according to claim 1, wherein when the high-speed rewrite process is continuously performed a predetermined number of times or more, the control unit controls the rewrite unit to execute the reset process. . The control means controls the rewriting means so as to execute the overwriting process when a next rewriting instruction is not given even if a reference time elapses after the rewriting instruction is given. Item 2. The image rewrite control device according to Item 1. By executing one rewriting process among a plurality of rewriting processes including a normal rewriting process, a high-speed rewriting process, and an overwriting process, an image to be displayed on the display device using the memory display element is changed from the first image to the second image. Rewriting means for rewriting to the image of the image, wherein the normal rewriting process includes: a first erasing step for erasing the first image from the display device; and a second erasing device for the display device after the first erasing step. A second erasing step of erasing the first image from the display device in a shorter period of time than the first erasing step. A second writing step of writing the second image on the display device after the erasing step, wherein the overwriting process includes the display device; And rewriting means comprising a further third write step of writing at least a portion of said second image on said display device in a state in which the second image is displayed on,
Based on the timing at which a rewrite instruction from the first image to the second image is given, an instruction from another device, and at least one of the first image and the second image, Control means for controlling the rewriting means so as to execute one rewriting process among a plurality of rewriting processes,
If the next rewriting instruction is not performed even after a reference time has elapsed since the rewriting instruction is performed, the control unit controls the rewriting unit to execute the overwriting process,
The reference time is determined based on a time obtained by statistically processing the timings of a plurality of rewrite instructions performed in the past by the rewriting means . By executing one rewriting process among a plurality of rewriting processes including a normal rewriting process, a high-speed rewriting process, and an overwriting process, an image to be displayed on the display device using the memory display element is changed from the first image to the second image. Rewriting means for rewriting to the image of the image, wherein the normal rewriting process includes: a first erasing step for erasing the first image from the display device; and a second erasing device for the display device after the first erasing step. A second erasing step of erasing the first image from the display device in a shorter period of time than the first erasing step. A second writing step of writing the second image on the display device after the erasing step, wherein the overwriting process includes the display device; And rewriting means comprising a further third write step of writing at least a portion of said second image on said display device in a state in which the second image is displayed on,
Based on the timing at which a rewrite instruction from the first image to the second image is given, an instruction from another device, and at least one of the first image and the second image, Control means for controlling the rewriting means so as to execute one rewriting process among a plurality of rewriting processes,
If the next rewriting instruction is not performed even after a reference time has elapsed since the rewriting instruction is performed, the control unit controls the rewriting unit to execute the overwriting process,
At least one of the data indicating the first image and the data indicating the second image has information indicating the reference time, and the reference time is an image based on the time indicated by the information. An image rewriting control device characterized by being determined for each. By executing one rewriting process among a plurality of rewriting processes including a normal rewriting process, a high-speed rewriting process, and an overwriting process, an image to be displayed on the display device using the memory display element is changed from the first image to the second image. Rewriting means for rewriting to the image of the image, wherein the normal rewriting process includes: a first erasing step for erasing the first image from the display device; and a second erasing device for the display device after the first erasing step. A second erasing step of erasing the first image from the display device in a shorter period of time than the first erasing step. A second writing step of writing the second image on the display device after the erasing step, wherein the overwriting process includes the display device; And rewriting means comprising a further third write step of writing at least a portion of said second image on said display device in a state in which the second image is displayed on,
Based on the timing at which a rewrite instruction from the first image to the second image is given, an instruction from another device, and at least one of the first image and the second image, Control means for controlling the rewriting means so as to execute one rewriting process among a plurality of rewriting processes,
If the next rewriting instruction is not performed even after a reference time has elapsed since the rewriting instruction is performed, the control unit controls the rewriting unit to execute the overwriting process,
The reference time is determined based on a data amount of the first image or the second image. By executing one rewriting process among a plurality of rewriting processes including a normal rewriting process, a high-speed rewriting process, and an overwriting process, an image to be displayed on the display device using the memory display element is changed from the first image to the second image. Rewriting means for rewriting to the image of the image, wherein the normal rewriting process includes: a first erasing step for erasing the first image from the display device; and a second erasing device for the display device after the first erasing step. A second erasing step of erasing the first image from the display device in a shorter period of time than the first erasing step. A second writing step of writing the second image on the display device after the erasing step, wherein the overwriting process includes the display device; And rewriting means comprising a further third write step of writing at least a portion of said second image on said display device in a state in which the second image is displayed on,
Based on the timing at which a rewrite instruction from the first image to the second image is given, an instruction from another device, and at least one of the first image and the second image, Control means for controlling the rewriting means so as to execute one rewriting process among a plurality of rewriting processes,
At least one of the data indicating the first image and the data indicating the second image includes information indicating which rewriting process of the plurality of rewriting processes is to be executed,
The image rewrite control apparatus, wherein the control means controls the rewrite means to execute a rewrite process determined for each image based on the information. An image rewriting control device according to any one of claims 1 to 7,
An information display device comprising: the display device driven by the image rewrite control device.

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