JP2001285467A - Portable communication terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a portable communication terminal in which a function such as communication is not damaged as much as possible due to driving of a mounted liquid crystal display element having memory. SOLUTION: This portable communication terminal is provided with a liquid crystal display panel 11 having memory. The display panel 11 is divided into a status display area 11a and a guide display area 11b. During communication, the status display area 11a is allowed to be updated, but the guide display area 11b is not allowed to be updated. The entire updating of the areas 11a and 11b may be inhibited during communication. The input-output level of communication is variable, and the area 11a is allowed to be updated only during the time when communication is performed at a low input-output level or in a standby mode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable communication terminal, and more particularly to a portable communication terminal such as a portable telephone, a PHS, a mail-only portable terminal, and a PDA with a communication function.

[0002]

2. Description of the Related Art In recent years, various research and developments have been made on a reflection type liquid crystal display device in which a liquid crystal exhibiting a cholesteric phase such as a cholesteric liquid crystal or a chiral nematic liquid crystal is sandwiched between two substrates. A liquid crystal exhibiting this type of cholesteric phase maintains the display (has memory properties) even after the application of voltage is stopped after displaying information, and does not require a backlight because it is of a reflective type. It has the advantage that bright, high-definition full-color display is easy.
Therefore, it is expected that various new and useful added values will be created by mounting such a reflective liquid crystal display element having a memory function in a portable communication terminal using a battery as a power supply.

However, the liquid crystal exhibiting a cholesteric phase has a problem that a driving voltage is relatively large. On the other hand, portable communication terminals are required to be able to maintain communication and a standby state for a long time with a limited battery capacity so that portability is not impaired. In fact, it is not possible to change to a large-capacity battery corresponding to the mounting of such a liquid crystal display element.

Further, when a liquid crystal display element having a memory function and a communication circuit requiring particularly large power in a portable communication terminal are simultaneously driven, a peak current increases, and communication may be interrupted. Such a problem can be predicted to be remarkable when the remaining amount of the battery becomes low.

It is an object of the present invention to provide a portable communication terminal in which a liquid crystal display element having a memory function is mounted, but a function such as communication is not impaired by driving the element.

[0006]

In order to achieve the above objects, a portable communication terminal according to a first aspect of the present invention provides a display element having a memory function, a driving unit for the display element, a power supply, and a communication unit. And control means for prohibiting simultaneous driving and communication of the display element.

[0007] In the portable communication terminal according to the first aspect of the present invention, driving and communication of a display element having a memory property requiring relatively large power are not performed simultaneously. Therefore, it is possible to avoid a possibility that the peak current increases and the communication is interrupted.

Further, a portable communication terminal according to a second aspect of the present invention provides a display element having a memory function, a driving unit for the display element, a power supply, a communication unit, and a display area of at least a part of the display element. Control means for prohibiting simultaneous driving and communication.

When processing in parallel with communication is prohibited, updating of all display areas of the display elements may be prohibited during communication. However, it is not always necessary to prohibit driving of all display areas and communication is interrupted. Updating of a part of the display area may be permitted within a range in which an excessive electrical load does not occur. The area in which display updating is permitted during communication may be an additional information display area, and the additional information preferably includes information related to the remaining power of the power supply. Information related to the remaining power of a power source such as a battery is necessary for effectively using the portable communication terminal, and if the priority is updated, the usability is improved.

In the portable communication terminal according to the second aspect of the present invention, the first mode in which updating of all display areas of the display element is inhibited during communication, or the display area of a part of the liquid crystal display element is inhibited during communication. Any of the second modes in which updating is permitted may be selectable.

Further, a portable communication terminal according to a third aspect of the present invention is based on a display element having a memory function, a driving unit for the display element, a power supply, a communication unit, and a change in a communication input / output level. And control means for adjusting the communication and the drive timing of the display element.

By adjusting the drive timing of the communication and the display element based on the change of the input / output level of the communication,
Since necessary information can be displayed while avoiding the possibility of communication interruption, operability is improved.

[0013] The term "standby" refers to a period in which the line is not connected, but is in a state of waiting for a call or communication from the other party (ie, a state in which the line can be immediately connected if a call or communication request is made by the other party). Or a period during which connection to a base station is being attempted to perform a call or communication.

For example, during standby or communication at a low input / output level, power consumption is not so large. Even if display update of the display element is permitted, there is no danger of causing a trouble such as interruption of communication, and rather, usability. Is improved. In this case, the area where display update is permitted may be limited to the additional information display area.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a portable communication terminal according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a mobile phone 1 according to an embodiment of the present invention. The appearance of the mobile phone 1 is the same as that of a normal mobile phone, and a liquid crystal display panel 11 and various operation keys are provided. , A microphone unit 13, a speaker unit 14, an antenna 15, and the like.

The liquid crystal display panel 11 uses a display element including a liquid crystal having a memory property, and its configuration and driving method will be described later. The liquid crystal display panel 11 is divided into a status display area 11a having a narrow upper portion and a guide display area 11b having a large area other than the status display area 11a. In the status display area 11a, for example, a reception intensity mark of a radio wave and a remaining mark of a built-in battery are displayed. In the guidance display area 11b, a telephone number, a name, a communication date and time, mail, various information related to mail, various messages, and the like are displayed.

It is needless to say that various contents other than those shown in FIG. 1 and those shown in FIGS. 9 and 16 may be displayed on the liquid crystal display panel 11. The status display area 11a may display a status display other than the remaining battery level and the electric field strength display and other additional information. For example, current date and time information, communication time, display mode, and the like may be displayed.

(Liquid crystal display element, see FIG. 2) Here, the liquid crystal display element used for the liquid crystal display panel 11 will be described. The liquid crystal display element 100 is a reflection type full-color display element based on a simple matrix driving method, which includes a liquid crystal exhibiting a cholesteric phase.

In the liquid crystal display element 100, a red display layer 111R for performing display by switching between a red selective reflection and a transparent state is disposed on the light absorbing layer 121, and a green selective reflection and a transparent state are switched thereon. Green display layer 11 for displaying by means of
1G, and a blue display layer 111B for performing display by switching between blue selective reflection and a transparent state is further laminated thereon.

Each display layer 111R, 111G, 111B
Has a structure in which a resin columnar structure 115, a liquid crystal 116 and a spacer 117 are sandwiched between transparent substrates 112 on which transparent electrodes 113 and 114 are formed, respectively. Transparent electrode 11
An insulating film 118 and an orientation control film 119 are provided on the 3, 114 as needed. Further, a sealing material 1 for sealing the liquid crystal 116 is provided on an outer peripheral portion (outside the display area) of the substrate 112.
20 are provided.

The transparent electrodes 113 and 114 are driven
C131 and 132 (see FIG. 3), and a predetermined pulse voltage is applied between the transparent electrodes 113 and 114, respectively. In response to the applied voltage, the display is switched between a transparent state in which the liquid crystal 116 transmits visible light and a selective reflection state in which visible light of a specific wavelength is selectively reflected.

The transparent electrodes 113 and 114 provided on each of the display layers 111R, 111G and 111B are composed of a plurality of strip-shaped electrodes which are arranged in parallel with a fine interval therebetween. They are opposed so as to be at right angles. Current is sequentially applied to these upper and lower strip electrodes. That is, display is performed by sequentially applying voltages to the liquid crystal 116 in a matrix. This is referred to as matrix driving, and a portion where the electrodes 113 and 114 intersect constitutes each pixel. By performing such matrix driving for each display layer, the liquid crystal display element 100
To display a full-color image.

More specifically, in a liquid crystal display device in which a liquid crystal exhibiting a cholesteric phase is sandwiched between two substrates, display is performed by switching the state of the liquid crystal between a planar state and a focal conic state. When the liquid crystal is in the planar state, assuming that the helical pitch of the cholesteric liquid crystal is P and the average refractive index of the liquid crystal is n, light of wavelength λ = P · n is selectively reflected. Also,
In the focal conic state, the light is scattered when the selective reflection wavelength of the cholesteric liquid crystal is in the infrared light range, and transmits visible light when the wavelength is shorter than that. Therefore, by setting the selective reflection wavelength in the visible light range and providing the light absorbing layer on the side opposite to the observation side of the element, it is possible to display the selective reflection color in the planar state and display black in the focal conic state. In addition, by setting the selective reflection wavelength in the infrared light range and providing a light absorption layer on the side opposite to the observation side of the element, light in the infrared light range is reflected in the planar state, but the wavelength in the visible light range is reflected. Is transmitted, so that a black display and a white display due to scattering in the focal conic state are possible.

In the liquid crystal display device 100 in which the display layers 111R, 111G, and 111B are stacked, the blue display layer 111B and the green display layer 111G are in a transparent state in which liquid crystals are in a focal conic arrangement, and the red display layer 111R is formed of a liquid crystal. A red display can be performed by setting the array in the selective reflection state. Also, the blue display layer 111B
Is set in a transparent state in which liquid crystals are in a focal conic arrangement, and the green display layer 111G and the red display layer 111R are in a selective reflection state in which liquid crystals are in a planar arrangement, whereby yellow display can be performed. Similarly, red, green, blue, white, cyan, magenta, yellow, and black can be displayed by appropriately selecting the state of each display layer between a transparent state and a selective reflection state. Further, by selecting an intermediate selective reflection state as the state of each of the display layers 111R, 111G, and 111B, an intermediate color can be displayed, and the display layer can be used as a full-color display element.

The liquid crystal 116 preferably exhibits a cholesteric phase at room temperature. In particular, a chiral nematic liquid crystal obtained by adding a chiral material to a nematic liquid crystal is suitable.

The chiral material is an additive having a function of twisting the molecules of the nematic liquid crystal when added to the nematic liquid crystal. By adding a chiral material to a nematic liquid crystal, a helical structure of liquid crystal molecules having a predetermined twist interval is generated, thereby exhibiting a cholesteric phase.

Note that the memory liquid crystal itself is not necessarily limited to this configuration, and the liquid crystal is dispersed in a conventionally known polymer three-dimensional network structure, or the polymer three-dimensional structure is contained in the liquid crystal. The liquid crystal display layer can be formed as a so-called polymer dispersed liquid crystal composite film having a network structure.

(Driving circuit, see FIG. 3) As shown in FIG. 3, the pixel configuration of the liquid crystal display element 100 has a plurality of scanning electrodes R1, R2 to Rm and signal electrodes C1, C2 to C2.
It is represented by a matrix with Cn (m and n are natural numbers). The scan electrodes R1, R2 to Rm are connected to the output terminal of the scan drive IC 131, and the signal electrodes C1, C2 to Cn are connected to the signal drive IC.
It is connected to the output terminal of C132.

The scan drive IC 131 includes scan electrodes R1, R
A selection signal is output to a predetermined one of 2 to Rm to be in a selected state, and a non-selection signal is output to other electrodes to be in a non-selected state. The scan driving IC 131 sequentially switches the scan electrodes R1 and R2 while switching the electrodes at predetermined time intervals.
To Rm. On the other hand, signal drive IC
132 simultaneously outputs a signal corresponding to image data to each of the signal electrodes C1, C2 to Cn in order to rewrite each pixel on the scanning electrodes R1, R2 to Rm in the selected state. For example, when the scanning electrode Ra is selected (a is a natural number satisfying a ≦ m), the scanning electrode Ra and each signal electrode C1, C2
Pixels LRa-C1 to LRa-Cn at the intersection with Cn are simultaneously rewritten. Thereby, the voltage difference between the scanning electrode and the signal electrode in each pixel becomes the rewrite voltage of the pixel, and each pixel is rewritten according to this rewrite voltage.

The driving circuit 130 of the liquid crystal display element 100
Controllers 133 and 134 controlled by a central processing unit (CPU) 135 and a driving IC (driver) 13
1, 132. Further, the CPU 135
Is connected to an image processing device 136 and an image memory 137. Based on the image data stored in the image memory 137, the controllers 133 and 134
132 is controlled to sequentially apply a voltage between each scanning electrode and the signal electrode of the liquid crystal display element 100 to write an image on the liquid crystal display element 100.

Here, assuming that the first threshold voltage for untwisting the liquid crystal exhibiting the cholesteric phase is Vth1, after applying the voltage Vth1 for a sufficient time, the second threshold voltage lower than the first threshold voltage Vth1 is applied. When the voltage is lowered to the threshold voltage Vth2 or less, a planar state is set. When a voltage of Vth2 or more and Vth1 or less is applied for a sufficient time, a focal conic state is established. These two states are stably maintained even after the voltage application is stopped. By applying a voltage between Vth1 and Vth2, halftone display, that is, gradation display is possible.

When partial rewriting is performed, only specific scanning lines may be sequentially selected so as to include a portion to be rewritten. As a result, only necessary parts can be rewritten in a short time.

The rewriting of each pixel can be performed by the above-described method. If an image is already displayed, reset all the pixels to the same display state before rewriting in order to eliminate the influence of the image. Is preferred. The reset may be performed for all pixels at once, or may be performed for each scanning line.

When partial rewriting is to be performed, resetting may be performed for each scanning line, or may be collectively performed only between scanning lines including a portion to be rewritten.

Various driving methods can be adopted.

The status display area 11a may be realized by partially driving the display panel 11, or the status display area 11a and the guide display area 11b may have independent panels and drive circuits.

(Control Unit of Mobile Phone, see FIG. 4) Next, the control unit of the mobile phone 1 will be described with reference to FIG. The control unit 50 is basically the same as a conventional mobile phone, and is mainly configured by the CPU 135 shown in FIG. The CPU 135 is further connected with an operation unit 12, a microphone 13, a speaker 14, a light emitting element 16 such as an LED for lighting for the purpose of notifying that a call is being made, a memory 17 for storing a telephone directory, and the like, and Antenna 1
5 is connected via the wireless communication circuit 18.

The battery 51 built in the control unit 50
Are connected to the CPU 135 and the driving circuit 1 via the power supply circuit 52.
30 and the wireless communication circuit 18. The remaining power of the battery 51 is monitored by a monitoring circuit 53 controlled by the CPU 135. CPU1
Reference numeral 35 determines whether display update of the liquid crystal display element 100 is permitted or not based on the remaining amount data from the monitoring circuit 53. It should be noted that such updating permission / prohibition control and various controls by the CPU 135 will be described later.

(Control procedure during a call, see FIGS. 5 to 9) FIG.
8 show a control procedure during a call by the CPU 135. First, in step S1, a message prompting a call and a status are displayed on the liquid crystal display panel 11 (see FIG. 9A). Further, in step S2, a display corresponding to a key operation of the operation unit 12 for inputting a telephone number or the like is displayed on the liquid crystal display panel 11.
To do.

Next, when it is confirmed in step S3 that the call is started by turning on the call button or the like, a line connection process is performed in step S4, and it is determined in step S5 whether or not the connection has been established. If the connection is established, a message to that effect is displayed in step S6 (see FIG. 9B), and the call is permitted in step S7. On the other hand, if the connection cannot be established due to busy or the like, step S
8 to that effect (see FIG. 9C), and step S2
Return to

After the call is permitted, the status determination subroutine is called in step S9 to determine the status. The status determined here is whether or not the user is in a call area and the remaining amount of the battery. As shown in FIG. 7, first, in step S21, it is determined whether or not the user is in a call area. If it is within the range, when a change in radio wave intensity is confirmed in step S22, a status update request 3 is sent in step S23.
(Intensity change).

On the other hand, if it is determined in step S21 that the user is not within the service area, a status update request 2 (out of service area) is instructed in step S26.

Next, in step S24, the monitoring circuit 53
Then, it is determined whether or not the remaining amount of the battery 51 is OK based on the detection in the above. If there is no remaining charge, a status update request 1 (battery warning) is issued in step S25.

When the above status determination processing is completed,
Returning to FIG. 6, it is determined in step S10 whether or not there is a status update request.
Move to 14. If an update has been requested, step S
At 11, the transmission mode is determined.

The transmission mode is a low output transmission mode and a high output transmission mode in this embodiment. As shown in FIG. 8, first, in step S31, the distance to the base station is determined,
If the distance is short, a low output transmission mode is set in step S32. If the distance is long, it is determined in step S33 whether or not voice communication at a volume equal to or higher than a certain level is continued. If the voice communication is continued, a high-output transmission mode is set in step S34. If not, step S3
5 sets the low output transmission mode.

When the above transmission mode determination processing is completed,
Returning to FIG. 6, it is determined in step S12 whether the low-output transmission mode is set. If the transmission mode is the low output transmission mode, the display of the status display area 11a is updated in step S13 (see (D1), (D2), and (D3) in FIG. 9), and the update request is canceled. That is, in the transmission mode determination process, the CPU 135 selects a mode in which the update of the entire area of the display element is prohibited during the communication and a mode in which the partial update of the display element is permitted during the communication.

Thereafter, it is determined in step S14 whether or not the line has been disconnected. If the line has not been disconnected, the flow returns to step S9. If the call is disconnected, information such as the talk time is displayed in the guidance display area 11b in step S15. That is, the display update of the display panel 11 is prohibited except for the status display area 11a from the time when the call is permitted in step S7 until the line is determined to be disconnected in step S14. When only the status display area 11a is updated, an increase in the electrical load is suppressed as compared with the case where the entire screen is updated. Therefore, even if the status display area 11a is updated during a call, there is little possibility of interrupting the call. It is also effective to prevent the display update from stopping halfway and the incomplete screen from being displayed.

Next, in step S16, it is determined whether or not status update requests 1 and 2 have been instructed. If so, the status display is updated in step S17 (see FIGS. 9D1 and 9D2). In any case, the update request is canceled in step S18. Since it is considered that it is not necessary to update and display the radio wave intensity immediately after the completion of the call and the display even if there is a change in the radio wave intensity, only the status update requests 1 and 2 are determined in step S16.

In the present embodiment, the status display is not updated while waiting for the start of the call / communication. Of course, during this period, the status determination processing as in step S9 is periodically executed. The status display may be updated as appropriate.

(Mode of Control Mode, See FIG. 10) In this portable telephone 1, when the line is connected, communication (meaning substantial data exchange) and liquid crystal display element 1 are performed.
Regarding the relationship with the drive of 00, the first and second drive shown in FIG.
And a third control mode.

In the first control mode, drawing on the liquid crystal display panel 11 is started after the end of communication, and communication is started after the end of drawing. In the second control mode, priority is given to drawing on the liquid crystal display panel 11, and when drawing starts, communication is temporarily interrupted. The third control mode gives priority to communication and starts drawing when communication is interrupted, but temporarily stops drawing when communication resumes.

The first, second and third control modes include:
In any case, the driving and the communication of the liquid crystal display panel 11 are prohibited from being performed simultaneously. In the mobile phone 1, at least the guidance display area 1 of the liquid crystal display panel 11
Simultaneous driving and communication of 1b are prohibited. Simultaneous driving of updating and communication of the entire area of the display panel 11 may be prohibited, or updating of only the guidance display area 11b may be prohibited. Note that the status may be periodically determined during communication, and the status may be periodically updated.

(Data Structure, See FIG. 11) FIG. 11 shows an example of the data structure, which includes a header, a text, an image, a footer and the like. Blanks B1 and B2 are force magnified due to line congestion, etc.
Can be provided in advance as shown in FIG.

(Control procedure during communication, see FIGS. 12 to 16)
12 to 15 show a control procedure at the time of communication such as mail by the CPU 135. When communication starts, step S4
In step 1, a message and a status are displayed on the liquid crystal display panel 11 (see FIG. 16A). Further, step S4
In step 2, a display corresponding to the key operation of the operation unit 12 is performed on the liquid crystal display panel 11.

Next, when the start of communication is confirmed in step S43, the line is connected in step S44, and
At 45, it is determined whether or not the connection has been established. If the connection can be established, a message to that effect is displayed in step S46 (see FIG. 16B).
In step S47, communication is permitted. On the other hand, if the connection cannot be established during server maintenance or the like, a message to that effect is displayed in step S48 (see FIG. 16C), and the process returns to step S42.

When the communication is permitted in step S47, the control mode is checked in step S49, and the subroutine of steps S50, S60, and S70 described below is executed based on the set control mode.

If the first control mode has been set, FIG.
As shown in FIG. 3, it is determined in step S51 whether one block of communication has been completed. If completed, the data reception of the next block is suspended in step S52, and
At 53, the display of the received data is started (see FIG. 16D).

Next, after completion of drawing of the received data is confirmed in step S54, it is determined in step S55 whether communication of all blocks has been completed. If completed, a message indicating that the process has been completed is displayed in step S56 (FIG. 16).
(See (E)), and the process returns to step S42. If not completed, the communication is resumed in step S57, and
Return to

On the other hand, if it is determined in step S51 that the communication of one block has not been completed, the interruption of the communication is confirmed in step S58, and the fact is displayed in step S59 (see FIG. 16F). Then, the process returns to step S42.

If the second control mode has been set, FIG.
As shown in FIG. 4, it is determined in step S61 whether or not image data has been received. If image data has been received, communication is temporarily stopped in step S62, and display of received data is started in step S63 (see FIG. 16D).

Next, after completion of drawing of the received data is confirmed in step S64, communication is restarted in step S65.
Then, it is determined in step S66 whether or not the communication has been completed. If the communication has been completed, a message indicating that the communication has been completed is displayed in step S67 (see FIG. 16E), and step S4 is performed.
Return to 2. If not, the process returns to step S61.

On the other hand, if it is determined in step S61 that the image data has not been received, the interruption of the communication is confirmed in step S68, and the fact is displayed in step S69 (see FIG. 16F). It returns to S42.

If the third control mode has been set, FIG.
As shown in FIG. 5, first, in step S71, it is determined whether image data has been received. If image data has been received, the existence of a communication blank is confirmed in step S72, and it is determined in step S73 whether or not the image data is new image data. If it is new image data, step S74
To start displaying the received data (see FIG. 16D).
If it is not new image data, drawing is restarted in step S75.

Next, in step S76, the presence or absence of communication data is determined. If there is communication data, drawing is temporarily stopped in step S77, and the process returns to step S71. If there is no communication data, the completion of the communication is confirmed in step S78, and a message indicating the completion is displayed in step S79 (FIG. 1).
6 (E)), and returns to step S42. If the communication is not completed, the process returns to step S76.

On the other hand, if it is determined in step S71 that the image data has not been received, the interruption of the communication is confirmed in step S80, and the fact is displayed in step S81 (see FIG. 16F). It returns to S42.

(Other Embodiments) The portable communication terminal according to the present invention is not limited to the above embodiment, but can be variously modified within the scope of the gist.

In particular, the present invention can be widely applied to portable communication terminals such as PHS, mail-only portable terminals, and PDAs with a communication function, in addition to portable telephones.

The appearance of the portable telephone shown in the above embodiment, the location of the liquid crystal display panel, and the like are arbitrary.

[Brief description of the drawings]

FIG. 1 is a front view showing a display example of a mobile phone and a display panel thereof according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating an example of a liquid crystal display element used in a liquid crystal display panel.

FIG. 3 is a block diagram showing a driving circuit of the liquid crystal display element.

FIG. 4 is a block diagram showing a control unit of the mobile phone.

FIG. 5 is a flowchart showing a control procedure during a call.

FIG. 6 is a flowchart showing a control procedure during a call, and is a continuation of FIG. 5;

FIG. 7 is a flowchart illustrating a status determination process.

FIG. 8 is a flowchart illustrating a transmission mode determination process.

FIG. 9 is an explanatory view showing a display example on a liquid crystal display panel during a call.

FIG. 10 is a chart showing a mode of a control mode.

FIG. 11 is a chart showing an example of a data structure.

FIG. 12 is a flowchart illustrating a control procedure during communication.

FIG. 13 is a flowchart showing a first control mode.

FIG. 14 is a flowchart showing a second control mode.

FIG. 15 is a flowchart showing a third control mode.

FIG. 16 is an explanatory diagram showing a display example on a liquid crystal display panel during communication.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Mobile telephone 11 ... Liquid crystal display panel 11a ... Status display area 11b ... Guidance display area 18 ... Wireless communication circuit 51 ... Battery 53 ... Battery monitoring circuit 100 ... Liquid crystal display element 135 ... CPU

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04Q 7/38 H04B 7/26 109T (72) Inventor Naoki Masazumi 2-chome Azuchicho, Chuo-ku, Osaka-shi, Osaka No. 3-13 Osaka International Building Minolta Co., Ltd. F-term (reference) 2H088 EA22 EA62 GA03 GA10 GA17 HA06 MA13 MA20 2H089 HA28 HA32 KA19 QA16 RA03 RA16 RA18 UA09 2H093 NA06 NA11 NC16 ND06 ND39 NF03 NF11 NF28 NG16 NG16 NG16 K11 AA26 AA33 BB04 EE02 FF02 FF23 FF31 GG01 GG11 HH21 HH22 KK00 KK05

Claims (10)

[Claims] 1. A display element having a memory property, a driving unit for the display element, a power supply, a communication unit, and a control unit for prohibiting simultaneous driving and communication of the display element. A portable communication terminal characterized by the following. 2. A display element having a memory function, a driving unit of the display element, a power supply, a communication unit, and prohibiting simultaneous driving and communication of at least a display area of the display element. A mobile communication terminal, comprising: 3. The mobile communication terminal according to claim 2, wherein the control unit prohibits updating of all display areas of the display element during communication. 4. The mobile communication terminal according to claim 2, wherein the control unit permits updating of only a part of the display area of the display element during communication. 5. The mobile communication terminal according to claim 4, wherein the area in which display updating is permitted during communication is an additional information display area. 6. A first mode in which updating of all display areas of a display element is prohibited during communication, or a second mode in which updating of a display area of a part of display elements is allowed during communication. The mobile communication terminal according to claim 2, further comprising a selection unit for selecting. 7. A display element having a memory function, a drive unit of the display element, a power supply, a communication unit, and a drive timing of communication and the display element is adjusted based on a change in an input / output level of communication. A mobile communication terminal, comprising: 8. The portable communication terminal according to claim 7, wherein said control means permits the display update of said display element only at the time of standby or at the time of communication at a low input / output level. 9. The portable communication terminal according to claim 7, wherein said control means permits updating of a display area of a part of said display element during standby or during communication at a low input / output level. 10. The portable communication terminal according to claim 9, wherein the area in which display updating is permitted during standby or during communication at a low input / output level is an additional information display area.