JP2008299025A - Self-luminous type display unit and portable electronic equipment provided with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the occurrence of display noise when a DC/DC converter is turned off after BLACK/MASK processing, and the voltage setting in a gate driver is turned off thereafter. <P>SOLUTION: In a manner where a display unit is constituted of an OLED panel, loads are small when a screen is in a black display state, thereby, the charges of rectifying capacitors 171 and 172 are hardly discharged and remain when the DC/DC converter 166 is turned off after the BLACK/MASK processing, and the voltage setting in the gate driver 163 is turned off thereafter. Thus, the current due to the residual charges flows to the OLED panel 30, then, the display noise occurs. Therefore, a discharge element (e.g. resistance 173) is inserted into the output of the DC/DC converter 166. Consequently, the charges in the rectifying capacitors 171 and 172 are promptly discharged. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a portable terminal device including a self-luminous display, and more particularly to a self-luminous display that prevents display noise when the display is off and a portable electronic device including the self-luminous display.

  In recent years, with the spread of the Internet and e-mail and the development of communication networks, opportunities to access various information from places other than fixed locations such as offices and homes are increasing. At the same time, portable terminal devices such as cellular phones, PHS (Personal Handyphone System), and PDA (Personal Digital Assistants) have come to be widely used. In addition, these portable terminal displays (also referred to as display devices) are demanded to display various information in the same manner as ordinary computers, and the use of color liquid crystal displays is rapidly spreading.

  By the way, attention is paid to the use of an EL (Electroluminescence) display together with a conventional liquid crystal display (LCD) as a display of such a portable terminal device. An EL display is a substance that emits light when a voltage is applied, and a substance containing an organic substance such as carbon is called an organic EL (hereinafter also referred to as OLED (Organic Light-Emitted Diode)).

  The organic EL display is a self-luminous display, like CRT (Cathode Ray Type) and plasma, and has various features such as high brightness, high resolution, high contrast, wide viewing angle, ultra-thinness, and low power consumption. )have. For this reason, attention has been focused on use for portable terminal devices that are small and have limited power consumption. Some organic EL elements emit light in a single color such as green, blue, and red, and a multi-color display can be configured by combining them. Further, since the display response speed is very fast and about 1000 times that of a liquid crystal display, a smooth moving image can be displayed. In addition, not only can light and shade be expressed, but a backlight is not required, so that the thickness is reduced, and depending on how it is used, power consumption can be further reduced (see, for example, Patent Document 1).

  For this reason, in recent years, OLEDs have been mounted for mobile phones. However, unlike the LCD, the OLED has only been used as an auxiliary display such as a rear display because of problems such as power consumption and burn-in. On the other hand, LCDs are used for both front and back displays, and their uses are greatly expanding.

  By the way, these displays have a RAM (frame memory) for storing display data irrespective of the LCD or OLED. The data in the RAM is displayed on the display. However, when turning on / off the display, there is a possibility that the data in the RAM is displayed at an unintended timing. The initial data in the RAM is indefinite and it is not known what image is displayed. Therefore, the user who sees this display feels uncomfortable. Note that the unintended timing is, for example, when a part of the display is turned on instantaneously, for example, when static electricity or the like is placed on the control line inside the display (display device) and it is a control line that turns on the display. End up. As a result, the data remaining in the RAM is output to the display. Further, in an LCD based on a black base color when the display is turned off, if data remaining in the RAM is displayed, pixels that are not black are generated, and noise is noticeable.

Therefore, conventionally, as a countermeasure, before transferring the display-off data to the display, the black (black) data is transferred to the RAM, and the data in the RAM is set to the “0” state (for each pixel). All gradations of R, G, and B are set to “0” (hereinafter referred to as “BLACK MASK”). By performing BLACK MASK, even if data in the RAM is displayed on the display at an unintended timing, the user will not feel uncomfortable if the display is black.
JP 2001-222255 A

  As described above, in the conventional black tone LCD, by executing BLACK MASK, even if data in the RAM is displayed on the display at an unintended timing, the user can visually recognize the display without feeling uncomfortable. (Display noise is not noticeable).

  However, since the OLED has a black tone as well, most of the noise can be made inconspicuous by BLACK MASK, but display noise that cannot be counteracted may still occur. This is because the load of the OLED differs depending on the displayed image. That is, in the case of white display, the current consumption of the OLED is large and the load is large, while in the case of black display, the current consumption of the OLED is small and the load is small.

  As described above, since the load varies greatly depending on the image displayed on the OLED, display noise occurs when the display is turned off (the voltage setting of the gate driver of the OLED is turned off). Hereinafter, the principle will be described with reference to FIGS. FIG. 9 is a flowchart showing the procedure for turning off the display of the OLED display (also referred to as a panel), and FIG. 10 is a diagram for explaining the cause of display noise on the OLED display.

  When the display OFF operation is started, a BLACK MASK process is performed (step S1 in FIG. 9). Thereafter, the power source of the DC / DC converter 166 in FIG. 10 is turned off (step S2 in FIG. 9). At this time, the rectifying capacitors 171 and 172 in FIG. 10 are charged with the electric charge stored when the DC / DC converter 166 is turned on and the display (panel) 30 is black (after the BLACK MASK process). It has become a state.

  Thereafter, after waiting for a predetermined time (step S3 in FIG. 9), when the power setting of the gate driver of the panel 30 is turned off (step S4 in FIG. 9), the moment when the gate driver power in the panel 30 is turned off (at this time) Since the OLED displays black, the current consumption is small and the load is small. Therefore, the remaining charge of the rectifier capacitor is not discharged and remains almost accumulated), and the gate driver output of the panel 30 is in a floating state. In this case, inflow currents from the rectifying capacitors 171 and 172 are generated in the gate line selected at this time, and some pixels emit light, and appear as noise (display noise).

  The present invention has been made in view of such a problem, and does not generate display noise even when the power of the DC / DC converter is turned off after the BLACK MASK processing and then the voltage setting of the gate driver is turned off. An object is to provide a portable electronic device including a light-emitting display and a self-light-emitting display.

  In order to solve the above problems, a portable electronic device including a self-luminous display according to the present invention includes a display configured by arranging a plurality of pixels each having a plurality of light emitting elements vertically and horizontally, and the plurality of the plurality of pixels. A gate driver that performs display by controlling a light emission state for each light emitting element, a DC / DC converter that supplies power to the display, and the gate driver and the DC / DC converter to control the display. A main control unit that performs control, a rectifying capacitor connected to each of positive and negative power supply lines from the DC / DC converter to the display, and a discharge element that connects between the positive and negative power supply lines. It is characterized by that.

  Moreover, it is preferable that the portable electronic device provided with the self-light-emitting display device is an organic EL display.

  Further, in the portable electronic device provided with the self-luminous display, the main control unit instructs to make all the drawing data output by the gate driver black when there is a request to turn off the display. It is preferable that the DC / DC converter is turned off later, and then the voltage setting of the gate driver is turned off.

  The self-luminous display according to the present invention includes a display configured by arranging a plurality of pixels each having a plurality of light emitting elements whose light emission states are controlled by a gate driver, and power supply to the display. A positive and negative power supply line to be received, a rectifying capacitor connected to each of the positive and negative power supply lines, and a discharge element connecting the sections from the rectifying capacitor to the display in each of the positive and negative power supply lines It was characterized by comprising.

  According to the present invention, no noise display occurs on the display.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. Hereinafter, a mobile phone will be described as a portable electronic device. However, the present invention is not limited to this, and may be a PHS (Personal Handy Phone System), a PDA (Personal Digital Assistant), a portable navigation device, a laptop computer, or the like. There may be.

  The basic structure of the mobile phone 1 will be described with reference to FIGS. FIG. 1 shows a front view of the mobile phone 1 in the opened state (first open state). 2A shows a left side view when the mobile phone 1 is opened, and FIG. 2B shows a right side view when the mobile phone 1 is opened. FIG. 3 shows a rear view in a state where the mobile phone 1 is opened.

  The mobile phone 1 includes an operation unit side body 2 and a display unit side body 3. The operation unit side body 2 and the display unit side body 3 are connected to each other via a connection unit 4 having a biaxial hinge mechanism, and the mobile phone 1 can be deformed into an open state and a closed state. In each closed state, the display unit side body 3 can be switched between a front state and a back state.

  Here, the closed state is a state in which both housings are arranged so as to overlap each other, and the open state is a state in which both housings are arranged so as not to overlap each other. In the open state, the display 30 disposed on the surface 3A of the display unit side body 3 to be described later and the operation key group 11 disposed on the front case 2a of the operation unit side body 2 are the same. The back state is a state in which the display 30 in the display unit side body 3 and the operation key group 11 in the operation unit side body 2 are disposed to face opposite sides. Say. Further, the front state in the closed state is a state in which the display 30 in the display unit side body 3 is arranged so as to face the operation key group 11 in the operation unit side body 2, and the back state in the closed state is In this state, the display 30 in the display unit side body 3 is exposed without facing the operation key group 11 in the operation unit side body 2.

  The outer surface of the operation unit side body 2 includes a front case 2a and a rear case 2b. The operation unit side body 2 has an operation key group (also referred to as an operation unit) 11 and a voice input unit (microphone) 12 to which a voice uttered by a user of the mobile phone 1 is input on the front case 2a side. Are configured to be exposed. Here, the operation key group 11 includes a function setting operation key 13 for operating various functions such as various settings, a telephone book function, and a mail function, and an input for inputting numbers of telephone numbers, characters such as mails, and the like. The operation key 14 includes a determination operation key 15 for performing determination in various operations, scrolling in the up / down / left / right directions, and the like. The microphone 12 (MIC) is arranged on the outer end side opposite to the connecting part 4 side in the longitudinal direction of the operation unit side body 2. That is, the microphone 12 is arranged on one outer end side when the mobile phone 1 is in the open state.

  Each key constituting the operation key group 11 is predetermined according to a deformed state such as an open / close state and a front / back state of the operation unit side body 2 and the display unit side body 3 and the type of application being activated. Function is assigned (key assignment). In the mobile phone 1, when each key constituting the operation key group 11 is pressed by the user, an operation corresponding to the function assigned to each key is executed.

  As shown in FIG. 2A, on one side surface of the operation unit side body 2, an interface 16 for transmitting / receiving data to / from an external device (for example, a host device), a headphone / microphone terminal 17, A removable external memory interface 18 and a charging terminal 19 for charging the battery are provided. The interface 16, the headphone terminal / microphone terminal 17, and the interface 18 are covered with a dust-proof cap that can be attached and detached when not in use.

  On the other side of the operation unit side body 2, as shown in FIG. 2B, a pair of side keys 20, an operation key 21 used at the time of imaging, and a broadcast wave whose radio wave reception angle can be adjusted. A receiving antenna 22 is arranged. A predetermined function is assigned to the side key 20 in accordance with a deformed state such as an open / close state and a front / back state of the operation unit side body 2 and the display unit side body 3 and the type of the activated application ( Key assignment). Here, similarly to the above, when the side key 20 is pressed by the user, an operation corresponding to the function assigned to the side key 20 in the mobile phone 1 is executed.

  As shown in FIG. 3, a camera unit 23 that captures an image of a subject and a light unit 24 that irradiates the subject with light are disposed in the rear case 2 b of the operation unit side body 2. The camera unit 23 and the light unit 24 are arranged on the connection unit 4 side in the operation unit side body 2. In addition, the rear case 2b in the operation unit side body 2 has an opening for mounting the battery in a battery housing portion, which will be described in detail later, and a battery lid 25 is disposed so as to close the opening. Is done.

  Moreover, the upper end part of the operation part side housing | casing 2 and the lower end part of the display part side housing | casing 3 are connected via the connection part 4 provided with a biaxial hinge mechanism, as shown in FIGS. As shown in FIG. 3, the sub operation key group 33 is arranged in a line in the width direction (short direction) of the mobile phone 1 on one surface (back surface) of the connecting portion 4. Each of the keys constituting the sub operation key group 33 depends on a deformed state such as an open / closed state or a front / back state of the operation unit side body 2 and the display unit side body 3 and the type of application being activated. A predetermined function is assigned (key assignment). In the mobile phone 1, when each key constituting the operation key group 11 is pressed by the user, an operation corresponding to the function assigned to each key is executed.

  Further, the display unit side body 3 is configured by a front case 3a and a rear case 3b on the outer surface. As shown in FIG. 1, a display 30 having a predetermined shape for displaying various information and a sound output unit 31 for outputting sound on the other party side of the call are exposed on the front case 3 a in the display unit side body 3. To be arranged. Here, the audio output unit 31 is disposed on the outer end side opposite to the connection unit 4 in the longitudinal direction of the display unit side body 3. That is, the audio output unit 31 is arranged on the other end side when the mobile phone 1 is in the open state.

  Further, as shown in FIG. 3, a sub-display 32 for displaying various types of information is disposed in the rear case 3 b of the display unit side body 3 so as to be exposed. Each of the display 30 and the sub display 32 includes an OLED panel and a liquid crystal panel, a drive circuit that drives the OLED panel and the liquid crystal panel, and a light source unit such as a backlight that emits light from the back side of the liquid crystal panel of the sub display. Composed.

  By the way, the display unit side body 3 and the operation unit side body 2 of the mobile phone 1 are shown in FIGS. 1 to 3 in a closed state in which the respective operation key groups 11 and the display 30 face each other. Such an open state can be formed by the connecting portion 4. In addition, a switch for detecting which state is present is provided in any of the cases. And when an open state is detected, the display 30 will be turned on by the control part mentioned later, and a display will be started. Further, when the closed state is detected, the control unit controls the display 30 to be turned off to reduce power consumption.

  In the present embodiment, the cellular phone 1 that can be folded by the connecting portion 4 is described. However, the cellular phone 1 is not foldable, and the operation unit side body 2 and the display unit side body 3 are overlapped. One of the casings is slid in one direction, or one of the casings is rotated about an axis along the direction in which the operation unit side casing 2 and the display unit side casing 3 overlap. A rotating type (turn type), or a type (straight type) in which the operation unit side body 2 and the display unit side body 3 are arranged in one housing and does not have a connecting portion may be used.

Further, it may be a flip type in which a flip is provided so that only the operation unit can be covered and the display unit is always exposed.
In addition, regardless of the type of mobile phone 1, the control unit monitors the operation of the operation key group 11, and when the operation does not occur for a predetermined time or longer, the display 30 is turned off to save power. It is controlled to do.

  FIG. 4 is a block diagram showing an internal configuration of the mobile terminal device according to the embodiment of the present invention. Here, a mobile phone will be described as an example of the mobile terminal device. As shown in FIG. 4, the mobile phone 1 includes a communication unit 111, a control unit 112, a storage unit 113, a voice processing unit 114, a display unit (also referred to as a display or display) 30, and an operation unit (operation). Key group) 11.

  The communication unit 111 transmits / receives a radio signal to / from the base station via a communication line using a channel assigned by any of the base stations (not shown).

  The control unit 112 includes a main control unit 120 and a drawing / display control unit 121 so that the internal configuration of the control unit 112 is expanded.

  The main control unit 120 controls the display unit 30 to draw a display object with a background, and also transmits data between the connected communication unit 111, audio processing unit 114, display unit 30, and operation unit 11. It becomes a control center as the control part 112 which performs exchange.

  The drawing / display control unit 121 develops drawing data in a storage unit 113 described later under the control of the main control unit 112, and draws drawing data from the storage unit 113 in synchronization with the display timing of the display unit 30. The data is read and displayed on the display unit 30.

  In addition to a program area 131 in which a plurality of processing programs for internal processing are stored, the storage unit 113 includes a work area 132 in which data being processed by the control unit 112 is temporarily stored, and a display for one screen. A display memory area 133 in which data is drawn in a bitmap format is allocated and stored. Note that the storage unit 113 includes, for example, a nonvolatile storage device (nonvolatile semiconductor memory, hard disk device, optical disk device, etc.), a random accessible storage device (eg, SRAM, DRAM), or the like.

  The audio processing unit 114 processes an audio signal output from a speaker (SP) and an audio signal input via a microphone (MIC: hereinafter referred to as a microphone). That is, the audio processing unit 114 amplifies the audio input from the microphone, performs analog / digital conversion, further performs signal processing such as encoding, converts it into digital audio data, and outputs it to the control unit 112. The audio processing unit 114 performs signal processing such as decoding, digital / analog conversion, and amplification on the audio data supplied from the control unit 112, converts the audio data into an analog audio signal, and outputs the analog audio signal to the speaker.

  The display unit 30 converts display information generated by the control unit 112 into a video signal and displays it. For example, the phone number of the callee at the time of mobile phone call, the phone number of the callee at the time of incoming call, the contents of received mail or outgoing mail, date, time, antenna level, battery remaining pictogram, success / failure of transmission, standby image, etc. Various information and images are displayed.

  Here, as the display unit 30, one pixel (display element) is configured by a plurality of light emitting elements (one self-light emitting element: provided for each of the three primary colors of R, G, and B). Is an organic EL display configured to display a screen by controlling the light emission state of each of the plurality of display elements (light emitting elements). Specifically, a plurality of light emitting elements A so-called organic EL display device (OLED panel) is used that configures one pixel, generates a color for each pixel by adjusting the amount of light for each of the plurality of light-emitting elements, and performs screen display using an aggregate of the pixels. .

  The OLED panel (display unit 30) includes, for example, a timing control unit 151, a column driving unit 152, a row driving unit 153, a power supply unit 154, and an OLED main body panel 155, as shown in FIG. It consists of.

  The video signal (VIDEO) output from the drawing / display control unit 121 of the control unit 112 is separated into an RGB signal, vertical synchronization (VD), and horizontal synchronization (HD) by the timing control unit 151. Among these signals, the RGB signals are once held in analog latches by the column driving unit 152, and then output in parallel for the number of columns of the OLED panel main body 155 at a specified timing. Each output signal is converted from a voltage to a current value to drive the column at a constant current. Thereby, display update is performed at a predetermined cycle.

  VD and HD are converted to a predetermined voltage by the row driving unit 153, and determine the on or off state of the pixel selected by the constant current signal output from the column. For example, assuming an OLED panel body 155 having m pixels in the horizontal direction and n pixels in the vertical direction, the OLED panel main body 155 has m column electrodes and n row electrodes. The n row electrodes are sequentially scanned from the first row to the n-th row of the row electrodes, and are activated by a constant current signal driven through the column electrodes only for a certain operation time. In this way, the scanning is sequentially switched from the first row electrode to the lowest row electrode in the nth row, and the address for one screen is updated. An image for one screen generated by the scanning pulse train from the first row to the n-th row at this time is called a frame, and it is necessary to repeat this screen scanning in order to continuously display the image.

  Returning to FIG. The operation unit 11 includes keys to which various functions are assigned, such as a power key, a call key, a numeric key, a character key, a direction key, a determination key, and a call key, and these keys are operated by the user. If it is, a signal corresponding to the operation content is generated and input to the control unit 112 as a user instruction.

  FIG. 6 is a block diagram illustrating a circuit 115 including the control unit 112 and the display unit (OLED panel) 30 of FIG. In FIG. 6, a circuit (block diagram) other than driving the OLED panel 30 is omitted as the configuration of the control unit 112.

  The circuit 115 includes an OLED panel 30 and other OLED panel control units. The circuit 115 shows an example of an OLED display device.

  The OLED panel 30 includes a gate circuit 160 and a gate driver 163, and the gate driver 163 includes a control unit 161 and a power supply unit 162. The OLED panel control unit includes a CPU 164, an OLED controller unit 163, a power supply control unit 165, and a booster circuit (DC / DC converter) 166.

  In the OLED display device 115 of FIG. 6, a booster circuit (DC / DC converter) 166 supplies a voltage to the gate driver 163 of the OLED panel 30. When detecting the closed state of the mobile phone 1 or the continuation of the no-operation state, that is, as described above, when the display OFF operation of the OLED panel body 155 is started, the control unit 112 executes the BLACK MASK process. Thereafter, the power supply of the booster circuit (DC / DC converter) 166 is turned off. At this time, rectifier capacitors 171 and 172 (not shown) respectively provided on the positive and negative power supply lines for supplying a voltage from the booster circuit (DC / DC converter) 166 to the gate driver 163 of the OLED panel 30. , When the DC / DC converter 166 is turned on and the display (OLED panel) 30 displays black (after the BLACK MASK process), the electric charge stored is charged.

  Thereafter, the control unit 112 waits for a predetermined time and then turns off the power setting of the gate driver 163 of the OLED panel 30. At this time, since the OLED panel main body 155 is in the black display state, the current consumption is small and the load is small. Since it is small, the electric charge stored in the rectifying capacitors 171 and 172 is not discharged and remains almost as it is. For this reason, the residual charge (current) a of the rectifying capacitors 171 and 172 flows into the gate circuit 160. At this time (when the voltage setting of the gate driver 163 is turned off), the gate driver output is in a floating state, and the inflow current from the rectifying capacitors 171 and 172 flows into the gate circuit 160 selected at that time. Part of the pixels emit light and appear as noise (display noise).

  Therefore, in the present invention, after the power source of the DC / DC converter 166 is turned off, the positive side and the negative side (positive and negative sides) are used in order to quickly set the electric charge stored in the rectifying capacitors 171 and 172 to “0”. ) Between the feeder lines (the output side of the DC / DC converter 166) is connected to a discharge element (for example, a resistor having a predetermined resistance value smaller than the resistance value of the OLED panel 30 itself).

  FIG. 7 is a circuit diagram in which the circuit 167 of FIG. 6 is extracted. As shown in FIG. 7, a discharge element 173 is provided between the positive side and negative side (positive electrode and negative electrode) power supply lines for supplying a voltage from the booster circuit (DC / DC converter) 166 to the gate driver 163 of the OLED panel 30. Inserted. As a result, after the power source of the DC / DC converter 166 is turned off, the charges stored in the rectifying capacitors 171 and 172 are quickly discharged by the discharge element 173, thereby avoiding the current flow due to the residual charge a to the gate circuit 160. be able to.

  FIG. 8 shows an example of an experimental result of the discharge state of the residual charge of the rectifier capacitor depending on the presence or absence of a resistor (discharge element). FIG. 8A is a graph showing a power supply waveform with no resistance, and it can be seen that since the load on the OLED is small, the discharge is slow, and a state with a high probability of appearing as noise appears for a long time. FIG. 8B is a graph showing a power supply waveform with resistance. Since a discharge path is secured by adding a resistor, the state where the discharge is fast and the probability of appearing as noise becomes very short is very short. It turns out that it converges. In each graph, the vertical axis represents the discharge voltage value, and the horizontal axis represents the discharge time.

  As described above, the present invention has the following effects.

  In the present invention, a discharge element (for example, a resistor) for discharge is inserted between the positive and negative power supply lines that supply voltage from the booster circuit (DC / DC converter) to the gate driver of the OLED panel. It is possible to prevent the generation of display noise. In addition, adding a resistor increases the minute current, but it is extremely small compared to the current consumption during display, so there is no problem.

  Further, according to the configuration of the present invention, when the state of the casing of the mobile phone 1 is changed (particularly a flip type in which the display unit is always exposed even in the closed state) or when the operation unit 11 continues to be in the non-operation state, the display is performed. Even when it is turned off, it is possible to prevent display of noise that is uncomfortable for the user.

  Note that all the functions of the constituent blocks of the mobile terminal device of the present invention may be realized by software, or at least a part thereof may be realized by hardware. For example, the processing in the main control unit 120 and the data processing in the drawing / display control unit 121 may be realized on a computer by one or a plurality of programs, or at least a part thereof may be realized by hardware. good.

It is a front view in the state (1st open state) which opened the mobile telephone. (A) The left view in the state which opened the mobile telephone is shown, (B) The right view in the state which opened the mobile telephone. It is a rear view in the state where a cellular phone was opened. It is a block diagram which shows the internal structure of the portable terminal device which concerns on embodiment of this invention. It is a figure which shows the internal structure of an OLED panel. It is a figure for demonstrating the current inflow by the residual charge to an OLED panel. It is the circuit diagram which extracted the circuit 167 of FIG. It is a figure which shows an example of the experimental result of the discharge condition of the residual charge of the rectifier capacitor by the presence or absence of resistance (discharge element). It is the flowchart which showed the procedure of display OFF of an OLED panel. It is a figure for demonstrating the cause which a display noise generate | occur | produces in an OLED panel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mobile telephone 2 Operation part side housing | casing 2a, 3a Front case 2b, 3b Rear case 3 Display part side housing | casing 4 Connection part 11 Operation key group (operation part)
30 OLED panel (display unit, display)
111 Communication Unit 112 Control Unit 113 Storage Unit 120 Main Control Unit 121 Drawing / Display Control Unit 155 OLED Panel Main Body 163 Gate Driver 166 DC / DC Converter (Boosting Circuit)
171, 172 Rectifier capacitor 173 Discharge element (resistance)

Claims (4)

A display configured by arranging a plurality of pixels having a plurality of light emitting elements vertically and horizontally;
A gate driver that performs display by controlling a light emission state of each of the plurality of light emitting elements;
A DC / DC converter for supplying power to the display;
A main control unit for controlling the display by controlling the gate driver and the DC / DC converter;
A rectifying capacitor connected to each of positive and negative power supply lines from the DC / DC converter to the display;
A discharge element for connecting between the positive and negative electrode feeders;
A portable electronic device provided with a self-luminous display characterized by comprising:   The portable electronic device having a self-luminous display according to claim 1, wherein the display is an organic EL display. When the main controller has a request to turn off the display,
5. The DC / DC converter is turned off after instructing all the drawing data output by the gate driver to be black, and then the voltage setting of the gate driver is set to off. A portable electronic device comprising the self-luminous display according to 1 or 2. A display configured by arranging a plurality of pixels having a plurality of light emitting elements whose light emission states are controlled by a gate driver vertically and horizontally;
A positive and negative power supply line that receives power supply to the display;
A rectifying capacitor connected to each of the positive and negative power supply lines;
In each of the positive and negative electrode power supply lines, a discharge element connecting the sections from the rectifying capacitor to the indicator,
A self-luminous display characterized by comprising:

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