JP4905430B2 - Image display device - Google Patents

Description

The present invention relates to an image display device that displays an electronically recorded image, such as a document viewer that displays a document or a photograph converted into electronic data.

In the conventional image display system described in Patent Document 1 below, a copying apparatus that optically reads and copies, and a STN (Super Twisted Nematic) type or TF on the display surface.
An image display device using a reflective liquid crystal display device of T (Thin Film Transistor) type is connected and integrated, and the display surface of the image display device and the document placement surface of the copying apparatus are arranged to face each other. Systems have been proposed. In this system, an image is displayed on a display surface, the displayed image is read with light irradiated in an oblique direction from a copying apparatus, and the read image is printed, thereby copying a desired image.

In recent years, there has been known an image display device using a reflective memory display that stores display contents in a state where power is not supplied. Examples of such a memory display include a reflective liquid crystal display device using cholesteric liquid crystal, and a reflective electric liquid that contains an electrophoretic dispersion liquid containing a liquid phase dispersion medium and electrophoretic particles between a pair of electrodes. An electrophoretic apparatus is employed and used for electronic paper or the like that displays an image of a document in page units.

A reflective liquid crystal display device using cholesteric liquid crystal is formed in the order of glass, a liquid crystal layer, glass, and an absorption layer from the display surface side, and the liquid crystal layer is in a white state that reflects incident light by an applied voltage, or While transitioning to one of the transmissive states, the absorption layer includes black ink and is configured to absorb light incident from the display surface side. With such a configuration, since the shadow of the liquid crystal layer in the white state caused by the light irradiated from the oblique direction on the display surface side is projected on the black absorption layer, this shadow is not visually recognized from the display surface side. In addition, since the electrophoretic particles are closely arranged on a substantially flat surface in the reflective electrophoretic device, the shadow caused by the light irradiated from the display surface side is not visible at any visible position regardless of the state of the electrophoretic particles. Does not occur.

As a method of optically reading and copying an image composed of a plurality of pages displayed on an image display device using such a memory display body for each page, the user operates the image display device to select a desired page. After the image is displayed each time, the display surface of the memory-type display body and the document placement surface of the copying apparatus for optically reading and copying are opposed to each other, and the user operates the copying apparatus for each page to make a desired operation. Duplicated image.

JP 2000-347539 A

The proposal disclosed in the above publication uses STN-type and TFT-type reflective liquid crystal display devices. The liquid crystal layer of these reflective liquid crystal display devices functions as a shutter corresponding to each pixel. Therefore, the light emitted from the oblique direction by the copying apparatus is shaded by the light shielding area of the liquid crystal layer, and this shadow appears black on the reflecting surface. Therefore, the outline of the image read by the copying apparatus becomes ambiguous and is read. The resolution of the captured image has decreased compared to the original image. When copying an image composed of a plurality of pages displayed on an image display device using a memory-type display, the user waits for the copying of one page to end and displays the next page. In addition to the need to operate the image display device, the memory display has a slower rewrite speed than liquid crystal displays such as STN type and TFT type, so that a document having a large number of pages can be copied. It took a lot of time and effort.

In order to solve the above-described problems, an image display apparatus according to the present invention includes a data input unit that receives image data including a plurality of pages, and a storage unit that stores the input image data. Each of the plurality of pages includes a plurality of drawing data generating means for generating a plurality of drawing data for each page based on the stored image data, and a plurality of pixel arrays. Reflective display means configured to display and display an image of one page indicated by one drawing data, having a display memory property that holds contents displayed on the display surface by reflection of external light when power is not supplied Detecting means that is arranged around the display surface and detects the presence or absence of movement of scanning light, which is light that is scanned along each pixel column on the display surface, based on the illuminance of incident light; and Inspection Page update means for sequentially rewriting an image of one page displayed on the reflective display means to an image of a page different from the page for each pixel column in response to the movement of the scanned light. It is characterized by that.

According to the present invention, drawing data in units of pages is generated from image data composed of a plurality of pages inputted and stored, and the image indicated by the drawing data is displayed on the reflective display means having display memory properties. In addition to displaying in units, the detection means detects the presence or absence of movement of the scanning light, which is light scanned along the pixel array to optically read the displayed image, and receives and displays the movement of the detected scanning light. The page update means sequentially rewrites each pixel column to an image on a page different from the image page. Accordingly, the user waits for the end of reading of the entire page by the scanning light, and the operation of turning the next page becomes unnecessary, so that it is possible to save labor and time for reading an image composed of a plurality of pages. The reflection type display means having display memory property is displayed without a decrease in display resolution due to scanning of light, because a shadow caused by light irradiated toward the display surface does not occur inside the reflection type display means. The image can be read clearly.

In the image display device of the present invention, there are a case where one detection means is arranged in the vicinity of the display surface and a case where a plurality of detection means are arranged apart from each other around the display surface. When one detection means is arranged in the vicinity of the display surface, mounting of the detection means and signal processing become easy, and the manufacturing cost can be suppressed. In addition, when a plurality of the display surfaces are arranged apart from each other around the display surface, the accuracy of detecting the movement of the scanning light is improved.

In the image display device of the present invention, the display surface may be substantially rectangular, and the detection means may be arranged along at least one of the four sides constituting the rectangle. In the image display device according to the aspect of the invention, the detection unit may be disposed to face each other along at least one of the two opposing sides of the rectangle and the other two opposing sides. May be.

In the image display device according to the aspect of the invention, it is preferable that the page update unit sequentially rewrites the pixel row through which the scanning light has passed following the movement of one scanning light detected by each of the detection units.

According to the present invention, since the movement of one scanning light is detected by a plurality of detection means arranged, the movement of the scanning light can be detected in detail, and the scanning light passes following the movement of the scanning light. Since the page of the image is sequentially rewritten from the pixel row, the time required from the start of the scanning light movement to the end of the page rewriting can be shortened even in the reflection type display means having a slow response speed.

In the image display device of the present invention, the direction in which the page of the image displayed on the display unit is rewritten is determined based on the time difference at which each of the detection units detects one scanning light, in the vertical direction or the horizontal direction of the display unit. It is preferable that display direction determining means for determining any one of the directions is further provided, and that the page updating means further rewrites the page of the image in accordance with the determined direction.

According to this invention, the page rewriting is performed in accordance with the direction in which the scanning light moves in order to recognize the moving direction of the light and determine the page rewriting direction from the time difference at which each of the plurality of detection means detects the scanning light. Can do.

The image display apparatus according to the present invention preferably further comprises an output means for outputting information indicating that the page has been rewritten by the page update means. The output means may output sound.

According to the present invention, it is possible to notify the user of the end of page rewriting by voice or the like.

It is preferable that the image display device of the present invention further includes an operation unit that operates to indicate the image to be displayed on the reflective display unit.

According to this invention, the user can instruct the image displayed on the reflective display means via the operation means.

The image display device of the present invention further includes a detection cycle determining unit that determines a cycle detected by the detecting unit, and the detection cycle determining unit is configured such that the intensity of light incident on the detecting unit falls below a certain value. In addition, one short cycle (T1) is selected, and when the intensity of light incident on the detection means exceeds the certain value and a certain time has passed, the other long cycle (T2) is selected. It is preferable to do.

According to the present invention, since the detection period is determined according to the intensity of light incident on the detection means and the elapsed time after the light is incident, the detection operation according to the situation is possible. Therefore, the power consumed by the image display device can be reduced.

In the image display device of the present invention, the reflective display means may include a cholesteric liquid crystal display element or an electrophoretic display element.

In the image display device of the present invention, the page update means further acquires the number of times that the scanning light repeatedly passes through the same page, and the movement of the scanning light is detected over the acquired number of times. In response, the page is preferably rewritten.

According to the present invention, the image of one page displayed on the reflective display means can be rewritten to the next page after waiting for the scanning light to pass through a predetermined number of times.

Hereinafter, an example of an image display apparatus will be described using an electronic portable terminal that displays the contents of an electronically recorded document.
(Embodiment)

FIG. 1 is an external configuration diagram showing an external configuration of an electronic portable terminal 100 according to an embodiment of the present invention. The electronic portable terminal 100 has a thick plate-like appearance, and is disposed on the surface of a rectangular display medium 80 that displays an image of an electronic document or the like including characters and figures in units of pages, and around the display medium 80. Optical sensors (122A to 122L) and operation buttons 120 for selecting a page of an electronic document to be displayed, a display form, and the like. Also, on one side surface of the electronic portable terminal 100 in the longitudinal direction, a sound output device 121 that includes a speaker and outputs sound is disposed, and on one side surface in the short side direction, a recording medium 90 (FIG. 2). A media drive 116 for reading image data such as an electronic document stored in is arranged. The display medium 80 has a display memory property that the content displayed on the display surface is maintained even when power is not supplied. When a page of an electronic document to be displayed is turned, one side of the display medium 80 is displayed. Then, the image of the page to be displayed next is sequentially rewritten for each pixel column to update the display content. With this configuration, the user can read desired image data from the media drive 116 and display it on the display medium 80. The image displayed on the display medium 80 is stored in the electronic portable terminal 100. The display is maintained even when the power is turned off.

Further, when optically reading an image of an electronic document displayed on the display medium 80 of the electronic portable terminal 100, the user activates an electronic reading device such as a scanner or a copying machine, The display surface of the display medium 80 of the electronic portable terminal 100 is opposed to the document placement surface of the electronic reading device, and the reading function of the electronic reading device is activated. Here, when the electronic document is composed of a plurality of pages, the electronic portable terminal 100 detects the copy of the displayed page by detecting the scanning of the light emitted from the electronic reading device by the optical sensors (122A to 122L). In addition, when the pages displayed on the display medium 80 are sequentially updated and when the pages are updated to the end of the page, the audio output device 121 has a function of emitting sound. Details of such a function will be described later.

FIG. 2 is a diagram illustrating a hardware configuration of the electronic portable terminal 100. The hardware of the electronic portable terminal 100 is a CPU (Central Processing Uni).
t) 110, ROM (Read Only Memory) 111, and RAM (Ran
dom Access Memory) 112, flash memory 113, display controller 114, VRAM (Video RAM) 115, media drive 116, operation input interface 117, signal input interface 118,
And an audio output interface 119. These hardware resources are connected to each other via a bus 123.

CPU110 reads the program stored in ROM111 as needed,
The read program is expanded and stored in the RAM 112. And the CPU 110
It is configured to control each hardware resource of the electronic portable terminal 100 by reading out and executing the program developed in the RAM 112 as necessary.

The display controller 114 follows the instruction from the CPU 110 and the VRAM 11
The data stored in 5 is displayed on the display medium 80. The display medium 80 is a display element that displays an image by reflection of external light and has display memory properties as described above. Specifically, a cholesteric liquid crystal display element or an electrophoretic display element is adopted. it can.

The flash memory 113 stores data in accordance with an instruction from the CPU 110, and the stored data is retained even when power is not supplied.

The media drive 116 is a device that reads and writes information on the recording medium 90. As the recording medium 90, for example, a compact flash (registered trademark) can be adopted.

An operation button 120 is connected to the operation input interface 117, and an operation instruction corresponding to the pressed operation button 120 is converted into an electric signal and transmitted.

An optical sensor 122 is connected to the signal input interface 118, and an output signal from the optical sensor 122 is digitized and converted into a predetermined electrical signal for transmission. This optical sensor 12
2 has a function of outputting a current signal corresponding to the intensity (illuminance) per unit area of incident light, such as a phototransistor. In this embodiment, the photosensor 122 is a display medium 80. Are arranged around the display surface. More specifically, the plurality of optical sensors 122
Are arranged so as to face each other along one opposite two sides of the rectangular display medium 80 and the other two opposite sides. However, the present invention is not limited to such a mode. The medium 80 may be arranged along at least one of the four sides constituting the rectangle, and only one optical sensor 122 may be arranged in the vicinity of the display medium 80.

An audio output device 121 is connected to the audio output interface 119. The voice output device 121 generates a buzzer sound, a voice message, or the like from the voice output device 121 in response to a voice output instruction input via the voice output interface 119.

FIG. 3 is a diagram showing a functional configuration of the electronic portable terminal 100. The electronic portable terminal 100 is
Data input means 10, storage means 15, drawing data generation means 20, and reflective display means 2
5, an operation unit 30, an update direction determination unit 35, a page update unit 40, an audio output unit 45, a detection unit 50, and a detection cycle determination unit 55.

Data input means 10 receives image data composed of a plurality of pages. The image data input from the data input means 10 is sent to the storage means 15. In this embodiment, the data input means 10 is assumed to be input from the recording medium 90 via the media drive 116. However, the present invention is not limited to such a method, and the data input means 10 is input via communication or a network. May be.

The storage unit 15 stores image data input from the data input unit 10 like the flash memory 113.

The drawing data generation unit 20 generates image drawing data for the instructed page from the image data stored in the storage unit 15 in accordance with an instruction from the operation unit 30 or the page update unit 40. The image indicated by the image drawing data can be displayed on the reflection type display means 25, and the drawing data generated here is sent to the reflection type display means 25. Further, the drawing data generation unit 20 generates information indicating that the generated drawing data has been sent to the reflection type display unit 25,
This information is sent to the voice output means 45.

Like the display medium 80 described above, the reflective display means 25 is composed of a plurality of pixel columns, and has a display memory property in which the content displayed on the display surface by reflection of external light is retained when power is not supplied. And has a function of displaying drawing data sent from the drawing data generating means 20.

Like the operation button 120, the operation unit 30 is operated by the user to specify an image to be displayed on the reflective display unit 25 and to indicate various functions. Further, via this operating means 30,
Settings can be made according to the function of the copying machine to which the electronic reader is applied and the copying method.
For example, when copying a plurality of copies using a copying apparatus that repeats scanning for each copy, the desired number of copies can be set from the operation means 30.

The detection unit 50 is disposed around the display surface of the reflective display unit 25 and has a function of detecting the presence or absence of movement of light scanned along the pixel column on the display surface based on the illuminance of incident light. . Specifically, the illuminance of the light incident through the optical sensor 122 is acquired, and when the acquired illuminance of the light exceeds a predetermined value L2 (FIG. 5), it is displayed on the display surface of the reflective display means 25. It is determined that the light is scanned to optically read the image, and the movement of the light is detected. Here, information relating to the detected movement of the scanning light is sent to the page updating means 40. Further, each of the plurality of optical sensors 122 arranged around the display surface of the display medium 80 detects the scanning light, and information regarding the detected time difference is sent to the update direction determining means 35.

The update direction determining means 35 determines the moving direction of the scanning light from the information about the detected time difference sent from the detecting means 50 and the arrangement position of the optical sensor 122 detected first, and based on this moving direction, the page updating means The direction in which the page is rewritten at 40 is indicated by the reflective display means 25.
The plan view is determined in either the vertical direction or the horizontal direction. Here, information on the determined direction is sent to the page update means 40.

The page update unit 40 has a function of receiving the movement of the scanning light detected by the detection unit 50 and sequentially rewriting an image displayed on the reflective display unit 25 for each pixel column. Specifically, the page update unit 40 identifies an area where the scanning light has already passed from the areas divided by each of the plurality of optical sensors 122 based on the information regarding the movement of the scanning light sent from the detection unit 50. At the same time, according to the information on the rewriting direction sent from the update direction determining means 35, the display from the rewriting start position to the area through which the scanning light has passed is rewritten to an image of a page different from the page on which the current image is displayed. An instruction is sent to the drawing data generation means 20.

In addition, the operating means 3 can copy a plurality of copies using a copying apparatus that repeats scanning of light for each copy.
When set to 0, the page updating unit obtains the number of times the same page is repeatedly scanned from the operation unit 30, and receives the detection of the obtained number of scans by the detecting unit 50, and the next page. Rewrite to Note that the order of the pages rewritten by the page updating means 40, that is, the ascending order or descending order, is rewritten according to any order preset by the operation means 30 or the like. Furthermore, the page update unit 40 is not limited to the function of updating to a page that is continuous with the current page, and the page to be updated may be specified discretely by giving an instruction from the operation unit 30 or the like in advance.

The detection cycle determination unit 55 determines a cycle for measuring the illuminance of light with respect to the detection unit 50.
Specifically, the detection cycle determination unit 55 determines the cycle according to the scanning light detected by the detection unit 50 and other incident light from the outside, and the detection unit 50 determines the illuminance of light according to the determined cycle. taking measurement. The procedure for determining the detection cycle will be described later.

Each of these functional units described above realizes each function by the above-described hardware resources and software stored in the ROM 111, the flash memory 113, and the like in an organic manner.

FIG. 4 is a flowchart for explaining the flow of processing in which an image composed of a plurality of pages stored in the electronic portable terminal 100 is optically read by light scanning of the electronic reading device, and will be described with reference to this figure. To do. In addition, in order to make explanation and understanding easier, description will be made with reference to the illuminance output of each optical sensor 122 in FIG.

First, the user activates the electronic portable terminal 100. When the electronic portable terminal 100 is activated, all the optical sensors 122A to 122L (FIG. 5) start detecting illuminance (step S140). Since the user uses the electronic portable terminal 100 under a normal environment, light having substantially the same illuminance is incident on these optical sensors 122A to 122L from the outside. Specifically, these optical sensors 122A to 122L detect an illuminance value that exceeds one illuminance value (L1) and does not exceed the other illuminance value (L2). In the present embodiment, the electronic portable terminal 1
Immediately after the start of 00, the detection cycle determining means 55 determines the cycle based on the predetermined illuminance value of the predetermined optical sensor 122I from among the optical sensors 122 arranged around the display medium 80. Has been. Therefore, based on the illuminance value detected by the predetermined optical sensor 122I, the detection cycle determining means 55 determines the low speed sampling cycle (TL) defined as the normal mode as the detection cycle (step S150). Note that the optical sensor 122 that determines the period is not limited to a specific one. For example, an average value of output values from all the optical sensors 122 may be obtained.

Subsequently, all the optical sensors 122 detect illuminance at a preset low-speed sampling cycle (TL) about once per second, and the predetermined optical sensor 122I detects one illuminance value ( It is determined whether or not L1) has been exceeded (step S152). Here, when the illuminance of the light detected by the predetermined optical sensor 122I is equal to or greater than one illuminance value (L1) (No in step S152), the low-speed sampling period (T
The process returns to the step of determining L) as the detection cycle (step S150), and the optical sensor 122 continues to detect light at the low-speed sampling cycle (TL). On the other hand, when the illuminance of the light detected by the predetermined optical sensor 122I does not exceed one illuminance value (L1) (Yes in step S152).
s) Specifically, the user operates the operation button 120 to display on the display medium 80 the first page to be copied from an image composed of a plurality of pages, and then displays the displayed page. In order to read, when the display surface of the display medium 80 is set to face the original placement surface of the electronic reading device and the light incident on the respective optical sensors 122 is blocked, detection of scanning light is performed. The result is reset and the optical scanning flag is OFF indicating no detection
(Step S154).

Subsequently, the detection cycle determining means 55 determines the high-speed sampling cycle (TH) defined as the reading standby mode as the detection cycle (step S156), and all the optical sensors 122 are detected.
Detects the illuminance at a preset high-speed sampling period (TH) of about once every 0.1 seconds.

Next, each time the illuminance is detected, the predetermined optical sensor 122I detects the detected illuminance as one illuminance value (L
1) It is determined whether or not it is above (step S158). Here, when the illuminance of light detected by the predetermined optical sensor 122I is equal to or greater than one illuminance value (L1) (Yes in step S158), the detected illuminance of the light is equal to or greater than one illuminance value (L1). It is determined whether or not it has continued for a certain time (step S160). As a result of the determination, if the state continues for a certain time or longer (Yes in step S160), it is determined that the state in which the display surface of the display medium 80 faces the document placement surface of the electronic reading device is released, and the detection cycle is set to the normal mode. Step to set (step S1
Return to 50).

Moreover, as a result of the determination, when the state does not continue for a certain time or longer (No in step S160),
It is determined whether or not the illuminance detected by any one of the optical sensors 122 exceeds the other illuminance value (L2) (step S164). Here, when the illuminance exceeds the other illuminance value (L2) (Yes in step S164), the optical scanning flag is set to ON indicating that the electronic portable terminal 100 has detected the light to be scanned (step S164). After step S168), the process returns to the step of determining the high-speed sampling period (TH) as the detection period (step S156). If the illuminance does not exceed the other illuminance value (L2) (No in step S164), it is determined that the scanning light has not been detected, and the high-speed sampling period (TH) is determined as the detection period (step S).
Return to 156).

On the other hand, in the step of determining whether or not the illuminance detected by the predetermined optical sensor 122I is equal to or greater than one illuminance value (L1) (step S158), the illuminance of the light detected by the predetermined optical sensor 122I is one illuminance. If it is less than the value (L1) (No in step S158), it is determined whether or not an optical scanning flag indicating detection of scanning light is ON (step S162). Here, when the optical scanning flag is OFF (No in step S162), the high-speed sampling cycle (T
The process returns to the step of determining H) as the detection cycle (step S156). If the optical scanning flag is ON (Yes in step S162), that is, if the scanning light has been detected,
The page is updated by the page update means 40 (step S166).

Here, FIG. 6 is a flowchart for explaining a flow of processing for updating a page, and a process for updating a page will be described with reference to FIGS. 6 and 5.

First, when this process is executed, it is determined whether or not the illuminances of the respective optical sensors 122 arranged in the vertical or horizontal direction of the display surface of the display medium 80 both exceed L2 (step S200). . Here, when the illuminances of the photosensors 122 arranged in the vertical direction or the horizontal direction both exceed L2 (Yes in step S200), the update direction determination unit 35 determines the illuminance by the update direction determination unit 35 based on the information regarding the photosensor 122 whose illuminance exceeds L2. The direction in which the page is updated is determined (step S202), and the process proceeds to a step (step S206) in which it is determined whether or not the pages of all areas of the display surface of the display medium 80 have been updated. For example, when the illuminance of the photosensors (122J, 122K, 122L) arranged above the display surface of the display medium 80 exceeds L2 after t0, the update direction determination unit 35 Then, it is determined that the scanning light moves from the upper side to the lower side of the display surface to be scanned, and the update direction is determined to update the page from the upper side to the lower side. When the scanning light scans the display medium 80, before scanning of the display surface is started,
A step in which the direction in which the page is updated is determined by the update direction determination unit 35 (step S202).
) Is always executed, and the update direction is determined.

On the other hand, when the illuminances of the optical sensors 122 arranged in the vertical direction and the horizontal direction do not exceed L2 (No in step S200), the page update unit 40 is in the middle of scanning the display surface with light. The drawing data generation means 20 is instructed to update the page from the region where the page update is started to the optical sensor 122 whose illuminance exceeds L2 (step S2).
04). For example, the illuminance of the photosensors (122A, 122I) arranged above the display surface is
When L2 is exceeded after t1 from the start, the page updating means 40 makes these optical sensors (
122A, 122I) is instructed to update the display of the area (S1) scanned before.

Subsequently, it is determined whether or not the pages of all the areas on the display surface of the display medium 80 have been updated (step S206). Here, when the pages of all the areas are updated (step S20).
6), the process ends, and the process returns to the next step (step S170) in FIG. On the other hand, when the page update of all the areas has not been completed (No in Step S206), the light sensor 122 adjacent in the direction of updating the page is set as an illuminance detection target (Step S208).
Specifically, the detection target is the optical sensor (122B, 122H) in the direction in which the page is updated more than the optical sensor (122A, 122I) whose illuminance exceeds L2.

Subsequently, the optical sensor (122B, 122H) to be detected is subjected to a high-speed sampling period (TH).
The illuminance is detected (step S210), and it is determined whether or not the detected illuminance exceeds the other illuminance value (L2) (step S212). Here, when the illuminance does not exceed the other illuminance value (L2) (No in step S212), the process returns to the step (step S210) in which the optical sensor (122B, 122H) detects the illuminance in the high-speed sampling period (TH). . On the other hand,
When the illuminance exceeds the other illuminance value (L2) (Yes in step S212), specifically,
If the illuminance of the currently detected optical sensors (122B, 122H) exceeds L2 after t2 from the start, the process returns to the step of updating the page of the area up to the detected optical sensor 122 (step S204). The page update unit 40 instructs to update the page of the area (S2) from the photosensors (122A, 122I) that are detection targets to the photosensors (122B, 122H) that are currently detection targets. Hereinafter, similarly, the region (S3) from the start to t3 after the start to the photosensors (122C, 122G) and the region (S4) from the start to t4 after the start to the photosensors (122D, 122E, 122F) are sequentially provided. It is updated by an instruction from the page update means 40. In this way, the light scan moves in a certain direction on the image of one page displayed on the display surface of the display medium 80, and the display surface follows the movement of the scan, so that the display surface is moved to the next page. Will be rewritten to the image.

Here, returning to FIG. 4, following the page update process (step S166), a buzzer sounds from the audio output device 121 to inform the user that the page has been updated (step S16).
9) It is determined whether or not the last page of the plurality of pages has been updated (step S17).
0). Here, when the page has been updated to the end (Yes in step S170), a buzzer sounds for a long time from the voice output device 121 to teach the user that the page has been updated to the end (step S172). Thereafter, the process returns to the step of determining the high-speed sampling period (TH) as the detection period (step S156).

On the other hand, if it has not been updated to the end of the page (No in step S170), the process proceeds to a step of turning off the optical scanning flag (step S174). Here, the detection result of the scanning light is reset, and the optical scanning flag is set to OFF indicating that it has not been detected. Subsequently, all the optical sensors 122A to 122L start detecting illuminance (step S176),
The process returns to the step of determining the high-speed sampling period (TH) as the detection period (step S156).

Through the processing described above, an image composed of a plurality of pages stored in the electronic portable terminal 100 is
Each time scanning is performed by light emitted from the electronic reading device, the next page is rewritten in order from the scanned area and notified by the buzzer, and the page is sequentially updated until the end of the page. Further, the user can know by the buzzer that the page has been updated to the end.

As mentioned above, although this invention was demonstrated based on embodiment shown in figure, this invention is not limited to this embodiment, The modification as described below can also be assumed.
(1) The setting of the reading method and the like of the electronic reading device is input by the user via the operation means 30, but various information is exchanged by connecting the electronic portable terminal 100 and the electronic reading device by wireless communication or the like. In addition, the electronic reading device may set a reading method or the like based on the received information.
(2) In addition to detecting the movement of the scanning light by the detecting means 50 and updating the display of the area through which the light has passed, the area to be scanned is estimated and the image displayed in this area is estimated. Display suitable for optical reading such as enhancing contrast may be performed.
(3) When the rewrite operation of the reflection type display means 25 is faster than the reading scan of the copying apparatus, the rewrite operation may be applied as a rewrite speed control means so that the rewrite operation does not pass the scanning light.

The external appearance block diagram which shows the structure on the external appearance of the electronic portable terminal which concerns on embodiment of this invention. The figure which shows the structure of the hardware of the electronic portable terminal which concerns on embodiment of this invention. The figure which shows the function structure of the electronic portable terminal which concerns on embodiment of this invention. 6 is a flowchart for explaining a flow of processing in which an image stored in the electronic portable terminal according to the embodiment of the present invention is optically read by the electronic reading device. The figure which shows the illumination intensity output of each optical sensor. The flowchart explaining the flow of the update process of the page displayed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Data input means, 15 ... Memory | storage means, 20 ... Drawing data generation means, 25 ... Reflection type display means, 30 ... Operation means, 35 ... Update direction determination means, 40 ... Page update means, 45 ... Audio | voice output means, 50 Detecting means 55 Detection period determining means 80 Display medium 90 Recording medium 100 Electronic mobile terminal 110 CPU 111 ROM 112 RAM 11
3 ... Flash memory, 114 ... Display controller, 115 ... VRAM, 116
DESCRIPTION OF SYMBOLS ... Media drive, 117 ... Operation input interface, 118 ... Signal input interface, 119 ... Audio | voice output interface, 120 ... Operation button, 121 ... Audio | voice output apparatus, 122 ... Optical sensor, 123 ... Bus.

Claims (8)

Storage means for storing image data;
Drawing data generating means for generating drawing data based on the stored image data;
Display means for storing contents to be displayed on the display surface when power is not supplied, and display means for displaying an image indicated by the drawing data;
Detecting means for detecting scanning light for scanning the display surface;
An estimation means for estimating an area of the display surface to be scanned in the near future based on detection of scanning light by the detection means;
Updating means for updating the image of the region estimated by the estimating means;
Equipped with a,
Said updating means, said picture display device comprising rewriting Rukoto the image in which the contrast of the image. The image display device according to claim 1 ,
One detection means is arranged in the vicinity of the display surface. The image display device according to claim 1 ,
The image display apparatus according to claim 1, wherein a plurality of the detection means are arranged apart from each other around the display surface. The image display device according to claim 3 ,
The display surface is substantially rectangular,
The image display apparatus according to claim 1, wherein the detection unit is arranged along at least one of four sides constituting the rectangle. The image display device according to claim 4 ,
The image display device according to claim 1, wherein the detection unit is arranged to face each other along at least one of two opposing sides of the rectangle and the other two opposing sides. The image display device according to any one of claims 3 to 5 ,
An update direction determining unit that determines a direction in which an image displayed on the display unit is rewritten based on a time difference in which the plurality of detecting units detect one scanning light;
The image display apparatus, wherein the updating means rewrites the image according to the determined direction. In the image display device according to any one of claims 1 to 6 ,
The image display apparatus, wherein the display means includes a cholesteric liquid crystal display element. The image display device according to any one of claims 1 to 7 ,
The image display apparatus, wherein the display means includes an electrophoretic display element.

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