JP2011242569A - Driving method of electrophoresis display device, electrophoresis display device, controlling circuit of electrophoresis display device and electronic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving method of an electrophoresis display device capable of suppressing an adverse effect due to the variation in viscosity of a dispersion medium while displaying a high-quality image, and further to provide the electrophoresis display device, a controlling circuit thereof and an electronic equipment.SOLUTION: There is provided of a method of driving an electrophoresis display device (1). The electrophoresis display device (1) comprises: a display unit (3) includes a plurality of pixels (20), each of which is provided with electrophoresis elements (23) that include electrophoresis particles and are interposed between a pixel electrode (21) and a counter electrode (22) opposed to each other; and temperature detecting means (111) for detecting environmental temperature. By means of the method of driving the electrophoresis display device (1), a first voltage applied to the counter electrode (22) as a counter voltage is changed at least in a writing period on the condition that the detected environmental temperature is lower than the threshold temperature.

Description

  The present invention relates to a method for driving an electrophoretic display device, an electrophoretic display device driven by the driving method, a control circuit for the electrophoretic display device, and an electronic device including the electrophoretic display device.

  As this type of driving method, for example, in an electrophoretic display device including an electrophoretic element sandwiched between a pixel electrode and a common electrode, one frame period necessary for determining the moving position of the electrophoretic particles is: Dividing into a plurality of subfields, appropriately selecting the divided subfields, controlling the application period of the data voltage applied to the pixel electrode during one frame period, and moving the electrophoretic particle movement position A driving method for control has been proposed (see Patent Document 1).

  The electrophoretic element is composed of, for example, a plurality of microcapsules each containing charged white electrophoretic particles and black electrophoretic particles, and a dispersion medium.

Japanese Patent Laid-Open No. 2004-102055

  Here, the viscosity of the dispersion medium constituting the electrophoretic element varies depending on the temperature. For this reason, the amount of movement of the electrophoretic particles varies due to variation in the viscosity of the dispersion medium. Then, there is a technical problem that the contrast of the image displayed on the electrophoretic display device may be reduced, or the previous drawing content may remain as an afterimage. With the technique described in Patent Document 1 described above, it is extremely difficult to solve the technical problem.

  The present invention has been made in view of the above problems, for example, and a method for driving an electrophoretic display device capable of displaying a high-quality image while suppressing the influence of fluctuations in the viscosity of the dispersion medium, and the electrophoretic display device It is an object of the present invention to propose an electrophoretic display device control circuit and an electronic device.

  In order to solve the above-described problem, a method for driving an electrophoretic display device according to the present invention includes a display unit including a plurality of pixels each provided with a pixel electrode facing each other and an electrophoretic element including electrophoretic particles between the counter electrodes. And a temperature detection means for detecting an environmental temperature, wherein the first potential as a counter potential applied to the counter electrode is a first potential as a counter potential applied to the counter electrode. If it is low, it is changed at least in the writing period.

  According to the driving method of the electrophoretic display device of the present invention, the driving method includes a display unit composed of a plurality of pixels each provided with a pixel electrode facing each other and an electrophoretic element including electrophoretic particles between the counter electrodes. This is a method of driving an electrophoretic display device that includes environmental temperature detection means and temperature detection means such as a temperature sensor. The electrophoretic display device according to the present invention is typically provided with a holding capacitor that is electrically connected to the pixel electrode and temporarily holds an image signal supplied to the pixel electrode.

  In this driving method, the first potential as the counter potential applied to the counter electrode is changed at least in the writing period on condition that the detected environmental temperature is lower than the temperature threshold. That is, in the driving method, the counter potential is changed at least in the writing period on condition that the detected environmental temperature is lower than the temperature threshold. Specifically, for example, on condition that the detected environmental temperature is lower than the temperature threshold, the first potential, for example, 0V, is changed to a potential different from the first potential, for example, 15V.

  “Changing the first potential” typically means that the pixel electrode and the counter electrode constituting at least a part of a plurality of pixels are compared with the case where the first potential is applied to the counter electrode as the counter potential. This means that the counter potential is changed from the first potential to another potential so that the voltage applied to the voltage increases. Here, “at least a part of the plurality of pixels” means a pixel that needs to be rewritten, for example, from white display to black display in the writing period.

  The “temperature threshold” according to the present invention is a value that determines whether or not to change the first potential as the counter potential, and is a value that is determined in advance as a fixed value or as a variable value according to some physical quantity or parameter. It is.

  Such a temperature threshold is determined as an environmental temperature at which a change in contrast exceeds an allowable range based on the obtained relationship by, for example, obtaining a relationship between the environmental temperature and contrast by empirical, empirical, or simulation. Or a temperature higher than the environmental temperature by a predetermined value. Alternatively, for example, the relationship between the environmental temperature and the viscosity of the dispersion medium constituting the electrophoretic element is obtained, and based on the obtained relationship, the rate of change of the viscosity with respect to the environmental temperature (that is, the differential value of the viscosity) is What is necessary is just to set as environmental temperature which changes greatly.

  “Writing period” means a period during which an effective (ie, meaningful) image displayed on the electrophoretic display device is written (in other words, displaying an effective image on the electrophoretic display device). Period during which a direct target write operation is performed). Note that “changing in the writing period” is not limited to changing the counter potential over the entire writing period, but may include changing the counter potential only during a part of the writing period.

  In an electrophoretic display device, for example, black electrophoretic particles and white electrophoretic particles move in a dispersion medium enclosed in a microcapsule by applying a predetermined voltage between a pixel electrode and a counter electrode. A predetermined image is formed. Here, a constant potential such as a ground potential is often applied to the counter electrode. On the other hand, a potential corresponding to image data is applied to the pixel electrode.

  By the way, the viscosity of the dispersion medium varies depending on the temperature. For this reason, when the temperature decreases and the viscosity of the dispersion medium increases, the amount of movement of the electrophoretic particles decreases. Then, there is a possibility that the contrast of the image is lowered or an afterimage is generated.

  Here, when the temperature drops, the voltage applied between the pixel electrode and the counter electrode is increased by increasing the absolute value of the pixel potential applied to the pixel electrode, thereby moving the electrophoretic particles. It is also possible to take a method of suppressing the decrease in the above. However, if the absolute value of the pixel potential is increased, the withstand voltage of the drive circuit must be improved, which may increase the cost or hinder the miniaturization of the electrophoretic display device, for example.

  However, in the present invention, as described above, the first potential as the counter potential applied to the counter electrode is changed at least in the writing period on condition that the detected environmental temperature is lower than the temperature threshold. In other words, in the present invention, by increasing the absolute value of the pixel potential, the voltage applied between the pixel electrode and the counter electrode is not increased, but by changing the counter potential, the pixel electrode and the counter electrode are changed. The applied voltage is increased. Note that the counter potential is changed in a variation range of the pixel potential (for example, −15 V to 15 V).

  For this reason, even if environmental temperature falls and the viscosity of a dispersion medium increases, the fall of the moving amount of electrophoretic particles can be suppressed. In addition, since the counter potential is changed, the withstand voltage of the drive circuit is not affected. As a result, according to the driving method of the electrophoretic display device of the present invention, it is possible to display a high-quality image while suppressing the influence due to the variation in the viscosity of the dispersion medium.

  Note that one frame period may be shortened on condition that the detected environmental temperature is lower than the temperature threshold. Here, “one frame period” means a period from one writing period to the next writing period. Further, “shortening one frame period” means shortening compared to one frame period in normal time (that is, when the environmental temperature is higher than the temperature threshold). Note that one frame period is shortened within a range in which a sufficient charge can be stored in the storage capacitor.

  When the voltage applied between the pixel electrode and the counter electrode increases, the potential difference between both ends of the storage capacitor increases. As a result, the leakage current increases in the holding period following the writing period, so that the potential difference between both ends of the holding capacitor decreases relatively quickly.

  As described above, by shortening one frame period (that is, increasing the refresh rate), the voltage applied between the pixel electrode and the counter electrode in the holding period can be reduced within a predetermined range. Is advantageous.

  In order to solve the above-described problems, an electrophoretic display device of the present invention includes a display unit composed of a plurality of pixels each provided with a pixel electrode facing each other and an electrophoretic element including electrophoretic particles between the counter electrodes, and an environment. Temperature detecting means for detecting temperature; and driving means for changing a first potential as a counter potential applied to the counter electrode at least in a writing period on condition that the detected environmental temperature is lower than a temperature threshold value. Is provided.

  According to the electrophoretic display device of the present invention, it is possible to display a high-quality image while suppressing the influence due to the fluctuation of the viscosity of the dispersion medium, as in the above-described driving method of the electrophoretic display device of the present invention. .

  In order to solve the above problems, a control circuit of an electrophoretic display device according to the present invention includes a display unit including a plurality of pixels each provided with a pixel electrode facing each other and an electrophoretic element including electrophoretic particles between the counter electrodes. And a temperature detection means for detecting the environmental temperature, the control circuit of the electrophoretic display device, wherein the first potential as the counter potential applied to the counter electrode, the detected environmental temperature from the temperature threshold A signal indicating that the change is made at least in the writing period is output on the condition that it is low.

  According to the control circuit of the electrophoretic display device of the present invention, a high-quality image is displayed while suppressing the influence due to the variation in the viscosity of the dispersion medium, as in the driving method of the electrophoretic display device of the present invention described above. be able to.

  In order to solve the above problems, an electronic apparatus according to the present invention includes the above-described electrophoretic display device according to the present invention.

  According to the electronic apparatus of the present invention, since the electrophoretic display device of the present invention described above is provided, a high-quality image can be displayed while suppressing the influence due to the fluctuation of the viscosity of the dispersion medium. Various electronic devices such as electronic paper, electronic notebooks, mobile phones, and portable audio devices can be realized.

  The effect | action and other gain of this invention are clarified from the form for implementing demonstrated below.

1 is a block diagram illustrating an overall configuration of an electrophoretic display device according to an embodiment of the present invention. It is a block diagram which shows the structure of the display part of the electrophoretic display device which concerns on embodiment of this invention. 2 is an equivalent circuit diagram illustrating an electrical configuration of a pixel according to an embodiment of the present invention. FIG. 3 is a flowchart showing a main part of a method for driving an electrophoretic display device according to an embodiment of the present invention. It is a characteristic view which shows an example of the relationship between environmental temperature and the viscosity of a dispersion medium. It is a conceptual diagram which shows an example of the mode of a change of the image displayed on the display part which concerns on embodiment of this invention. It is a conceptual diagram which shows an example of each time change of a pixel electric potential and a common electric potential when environmental temperature is normal temperature-high temperature. It is a conceptual diagram which shows an example of each time change of a pixel electric potential and a common electric potential when environmental temperature is low temperature. It is a perspective view which shows the structure of the electronic paper as an example of the electronic device to which the electrophoretic display apparatus is applied. It is a perspective view which shows the structure of the electronic notebook as another example of the electronic device to which an electrophoretic display apparatus is applied.

  Hereinafter, embodiments of an electrophoretic display device according to the present invention and an electronic apparatus including the electrophoretic display device will be described with reference to the drawings.

<Electrophoretic display device>
(Configuration of electrophoretic display device)
An electrophoretic display device according to an embodiment of the present invention will be described with reference to FIGS. In the following drawings, the scale of each layer / member is different for each layer / member to have a size recognizable on the drawing.

  First, the overall configuration of the electrophoretic display device according to the present embodiment will be described with reference to FIG. FIG. 1 is a block diagram showing the overall configuration of the electrophoretic display device according to this embodiment.

  In FIG. 1, the electrophoretic display device 1 includes a display unit 3, a control circuit 10, a temperature sensor 111, a display body drive circuit 130, and a display body power supply circuit 200. The display unit 3 and the control circuit 10 may be configured to be separable from each other.

  The temperature sensor 111 as an example of the “temperature detection means” according to the present invention detects the environmental temperature. Here, the temperature sensor 111 is arrange | positioned at the center of the back surface of the display part 3 (namely, panel), for example. Note that the position of the temperature sensor 111 is not limited to the center of the back surface of the display unit 3, but for example, the temperature of the environment such as the edge of the back surface of the display unit 3 or the part of the display frame that is not always touched by the user's hand. As long as the position is detectable (in other words, without being affected by the user's body temperature), it may be placed anywhere. Further, the temperature sensor 111 is not limited to one, and a plurality of temperature sensors 111 may be provided.

  A signal indicating the environmental temperature output from the temperature sensor 111 is converted into a digital value by an ADC (Analog Digital Converter) 112, and whether or not the environmental temperature is lower than a temperature threshold in a logic circuit (Programmable Logic Device: PLD) 113. Is determined. The result of the determination (for example, “1” when the environmental temperature is lower than the temperature threshold, “0” when the environmental temperature is equal to or higher than the temperature threshold, etc.) is stored in a RAM (Random Access Memory) 114.

  As an example of “driving means” according to the present invention, the control circuit 10 includes a CPU (Central Processing Unit) 101, a display drive circuit 102, a flash ROM (Read Only Memory) 103, and a RAM 104. .

  Here, the flash ROM 103 stores image data transferred from, for example, a personal computer. The RAM 104 temporarily holds image data to be drawn next time on the display unit 3. The display body drive control circuit 102 is based on, for example, the image data stored in the RAM 104, the determination result stored in the RAM 114, and the like, acquired via the CPU 101, and the display body power supply circuit 200 and the display body drive circuit. 130 is controlled to rewrite the image displayed on the display unit 3.

  The display body driving circuit 130 includes a scanning line driving circuit 131, a data line driving circuit 132, and a common potential supply circuit 133, which will be described later.

  Next, the display unit 3 of the electrophoretic display device 1 will be described with reference to FIG. FIG. 2 is a block diagram showing the configuration of the display unit of the electrophoretic display device according to this embodiment. In FIG. 2, for the convenience of explanation, among the members shown in FIG. 1, members that are not directly related are not shown.

  In FIG. 2, the display unit 3 includes m rows × n columns of pixels 20 arranged in a matrix (two-dimensional plane). The display unit 3 includes m scanning lines 40 (that is, scanning lines Y1, Y2,..., Ym) and n data lines 50 (that is, data lines X1, X2,..., Xn). It is provided so as to cross each other. Specifically, the m scanning lines 40 extend in the row direction (that is, the X direction), and the n data lines 50 extend in the column direction (that is, the Y direction). The pixels 20 are arranged corresponding to the intersections of the m scanning lines 40 and the n data lines 50.

  The control circuit 10 controls operations of the scanning line driving circuit 131, the data line driving circuit 132, and the common potential supply circuit 133. For example, the control circuit 10 supplies timing signals such as a clock signal and a start pulse to each circuit.

  Based on the timing signal supplied from the control circuit 10, the scanning line driving circuit 131 sequentially supplies a scanning signal in a pulse manner to each of the scanning lines Y1, Y2,. The data line driving circuit 132 supplies image signals to the data lines X1, X2,..., Xn based on the timing signal supplied from the control circuit 10. The common potential supply circuit 133 supplies the common potential Vcom to the common potential line 93.

  Various signals are input / output to / from the control circuit 10, the scanning line driving circuit 131, the data line driving circuit 132, and the common potential supply circuit 133, but descriptions of those that are not particularly related to the present embodiment are omitted. To do.

  Next, the basic configuration of the pixel 20 of the electrophoretic display device 1 will be described with reference to FIG. FIG. 3 is an equivalent circuit diagram showing an electrical configuration of the pixel according to the present embodiment.

  In FIG. 3, the pixel 20 includes a pixel switching transistor 24, a pixel electrode 21, a common electrode 22, an electrophoretic element 23, and a storage capacitor 27.

  The pixel switching transistor 24 is composed of, for example, an N-type transistor. The pixel switching transistor 24 has a gate electrically connected to the scanning line 40, a source electrically connected to the data line 50, and a drain electrically connected to the pixel electrode 21 and the storage capacitor 27. It is connected to the.

  The pixel switching transistor 24 is configured to pulse the image signal supplied from the data line driving circuit 132 (see FIG. 2) via the data line 50 via the scanning line 40 from the scanning line driving circuit 131 (see FIG. 2). Are output to the pixel electrode 21 and the storage capacitor 27 at a timing corresponding to the scanning signal supplied to the pixel.

  An image signal is supplied to the pixel electrode 21 from the data line driving circuit 132 via the data line 50 and the pixel switching transistor 24. The pixel electrode 21 is disposed so as to face the common electrode 22 through the electrophoretic element 23.

  The common electrode 22 as an example of the “counter electrode” according to the present invention is electrically connected to a common potential line 93 to which a common potential Vcom is supplied.

  The electrophoretic element 23 is composed of a plurality of microcapsules each containing electrophoretic particles.

  The storage capacitor 27 is composed of a pair of electrodes arranged opposite to each other with a dielectric film therebetween, one electrode is electrically connected to the pixel electrode 21 and the pixel switching transistor 24, and the other electrode is a common potential line 93. Is electrically connected. The image signal can be maintained for a certain period by the holding capacitor 27.

(Driving method of electrophoretic display device)
Next, a driving method of the electrophoretic display device 1 configured as described above will be described with reference to FIGS.

  A driving method of the electrophoretic display device 1 when the image displayed on the display unit 3 is rewritten will be described with reference to the flowchart of FIG. FIG. 4 is a flowchart showing a main part of the driving method of the electrophoretic display device according to this embodiment.

  In FIG. 4, first, when the screen rewrite button 121 (see FIG. 1) is pressed by the user, the CPU 101 in the control circuit 10 stores the environmental temperature T1 measured by the temperature sensor 111 and stored in the RAM 114. A relationship with the temperature threshold value Tth (that is, a determination result in the PLD 113) is acquired (step S101).

  Here, the temperature threshold value Tth will be described with reference to FIG. FIG. 5 is a characteristic diagram showing an example of the relationship between the environmental temperature and the viscosity of the dispersion medium.

  As shown in FIG. 5, the viscosity of the dispersion medium enclosed in the microcapsules constituting the electrophoretic element 23 varies according to the environmental temperature. In particular, when the environmental temperature is lower than a certain level, the viscosity of the dispersion medium is remarkably increased. For this reason, when the environmental temperature is lowered, there is a possibility that the moving amount of the electrophoretic particles enclosed in the microcapsules is reduced (that is, the responsiveness is deteriorated). As a result, there is a possibility that the contrast of the image displayed on the display unit 3 is lowered or an afterimage is generated.

  Therefore, in this embodiment, as shown in FIG. 5, for example, a temperature at which the gradient of the temperature change of the dispersion medium changes significantly is set as the temperature threshold value Tth, and whether or not the environmental temperature is higher than the temperature threshold value Tth. Accordingly, the driving method of the electrophoretic display device 1 is changed as will be described later. That is, the “temperature threshold value Tth” according to the present embodiment is a value that determines whether or not to change the driving method of the electrophoretic display device 1.

  Returning to FIG. 4 again, the CPU 101 determines whether or not the environmental temperature T1 measured by the temperature sensor 111 is higher than the temperature threshold Tth (step S102). When it is determined that the environmental temperature T1 is higher than the temperature threshold Tth (step S102: Yes), the CPU 101 acquires “normal to high temperature drive parameters” from the ROM 103, for example (step S103), and the display unit 3 The display body drive circuit 130 and the display body power supply circuit 200 are controlled via the display body drive control circuit 102 so as to rewrite the image displayed above (step S104).

  Here, when the environmental temperature T1 is higher than the temperature threshold Tth, the pixel potential and the common potential when the image displayed on the display unit 3 is rewritten will be specifically described with reference to FIGS. . FIG. 6 is a conceptual diagram illustrating an example of a change in an image displayed on the display unit according to the present embodiment. FIG. 7 illustrates a pixel potential and a common potential when the environmental temperature is normal temperature to high temperature. It is a conceptual diagram which shows an example of each time change of these.

  As shown in FIG. 6, each of the pixel potential and the common potential when the area A of the display unit 3 is rewritten from white to black, for example, and the area B of the display unit 3 is rewritten from black to white, for example. The time change of will be described. It is assumed that the white electrophoretic particles are negatively charged and the black electrophoretic particles are positively charged.

  As shown in FIG. 7, first, in the reset period, the pixel potentials of the region A and the region B are set to “−V”. On the other hand, the common electrode 22 is supplied with “0 V” as the common potential Vcom. As a result, the entire display unit 3 is displayed in white.

  Next, in the writing period, the pixel potential of the region A is set to “+ V”. On the other hand, the pixel potential in the region B is set to “0V”, and “0V” is supplied to the common electrode 22 as the common potential Vcom. As a result, the area A is displayed in black and the area B is maintained in white display.

  Returning to FIG. 4 again, in the process of step S102, when it is determined that the environmental temperature T1 is equal to or lower than the temperature threshold Tth (step S102: No), the CPU 101 acquires “low temperature drive parameter” from the ROM 103, for example. (Step S105), the display body drive circuit 130 and the display body power supply circuit 200 are controlled via the display body drive control circuit 102 so as to rewrite the image displayed on the display unit 3 (step S105). Step S106).

  Here, the pixel potential and the common potential when the image displayed on the display unit 3 is rewritten when the environmental temperature T1 is equal to or lower than the temperature threshold Tth will be described with reference to FIG. FIG. 8 is a conceptual diagram showing an example of temporal changes of the pixel potential and the common potential when the environmental temperature is low, with the same meaning as in FIG.

  As shown in FIG. 6, when the area A of the display unit 3 is rewritten from, for example, white to black, and the area B of the display unit 3 is rewritten from, for example, black to white, first, in the reset period, the area A The pixel potential of the region B is set to “−V”. On the other hand, the common electrode 22 is supplied with “+ V” as the common potential Vcom. For this reason, a potential difference of “2 V” is generated between the pixel electrode 21 and the common electrode 22. Therefore, even if the environmental temperature decreases and the viscosity of the dispersion medium increases, the entire display unit 3 can be displayed in white while suppressing a decrease in the amount of movement of the electrophoretic particles.

  Next, in the writing period, the pixel potential of the region A is set to “+ V”. On the other hand, the pixel potential in the region B is set to “−V”, and “−V” is supplied to the common electrode 22 as the common potential Vcom. For this reason, a potential difference of “2 V” is generated between the pixel electrode 21 and the common electrode 22 in the region A. Therefore, the region A can be displayed in black while suppressing a decrease in the amount of movement of the electrophoretic particles.

  When it is determined that the environmental temperature T1 is equal to or lower than the temperature threshold Tth, in addition to changing the value of the common potential Vcom as shown in FIG. 8, one frame period may be shortened (that is, refreshing). Rate may be increased). With this configuration, it is possible to suppress a decrease in voltage applied between the pixel electrode 21 and the counter electrode 22 during the holding period. In this embodiment, a reset period is provided, but the reset period may be omitted. In this embodiment, the temperature threshold value Tth is a temperature at which the gradient of the temperature change of the dispersion medium viscosity changes remarkably. However, when performing an operation that requires a high-speed response (for example, handwriting input by an external input device). Only the temperature threshold Tth may be set high, and the voltage applied between the pixel electrode and the counter electrode may be increased even at a room temperature to a high temperature.

<Electronic equipment>
Next, electronic devices to which the above-described electrophoretic display device is applied will be described with reference to FIGS. Below, the case where the electrophoretic display device described above is applied to electronic paper and an electronic notebook is taken as an example.

  FIG. 9 is a perspective view illustrating a configuration of the electronic paper 400.

  As illustrated in FIG. 9, the electronic paper 400 includes the electrophoretic display device according to the above-described embodiment as a display unit 401. The electronic paper 400 has flexibility, and includes a main body 402 made of a rewritable sheet having the same texture and flexibility as conventional paper.

  FIG. 10 is a perspective view showing the configuration of the electronic notebook 500.

  As shown in FIG. 10, an electronic notebook 500 is obtained by bundling a plurality of electronic papers 400 shown in FIG. 9 and sandwiching them between covers 501. The cover 501 includes display data input means (not shown) for inputting display data sent from an external device, for example. Thereby, according to the display data, the display content can be changed or updated while the electronic paper is bundled.

  Since the electronic paper 400 and the electronic notebook 500 described above include the electrophoretic display device according to the above-described embodiment, it is possible to perform high-quality image display while suppressing the influence due to the variation in the viscosity of the dispersion medium. .

  In addition to these, the electrophoretic display device according to the present embodiment described above can be applied to the display unit of an electronic device such as a wristwatch, a mobile phone, or a portable audio device.

  The present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist or concept of the invention that can be read from the claims and the entire specification, and an electrophoretic display with such a change. An apparatus driving method, an electrophoretic display device, a control circuit for the electrophoretic display device, and an electronic apparatus including the electrophoretic display device are also included in the technical scope of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Electrophoretic display device, 3 ... Display part, 10 ... Control circuit, 20 ... Pixel, 21 ... Pixel electrode, 22 ... Common electrode, 23 ... Electrophoretic element, 111 ... Temperature sensor, 130 ... Display body drive circuit, 200 ... Display power supply circuit

Claims (5)

A driving method for an electrophoretic display device, comprising: a pixel electrode that is opposed to each other; a display unit that includes a plurality of pixels each provided with an electrophoretic element that includes electrophoretic particles; and a temperature detection unit that detects environmental temperature. Because
A method for driving an electrophoretic display device, wherein a first potential as a counter potential applied to the counter electrode is changed at least in a writing period on condition that the detected environmental temperature is lower than a temperature threshold. .   2. The driving method of the electrophoretic display device according to claim 1, wherein one frame period is shortened on condition that the detected environmental temperature is lower than the temperature threshold. A display unit comprising a plurality of pixels each provided with an electrophoretic element including electrophoretic particles between a pixel electrode facing each other and the counter electrode;
Temperature detection means for detecting the environmental temperature;
Driving means for changing a first potential as a counter potential applied to the counter electrode, at least in a writing period, on condition that the detected environmental temperature is lower than a temperature threshold value. Display device. A control circuit for an electrophoretic display device, comprising: a display unit comprising a plurality of pixels each provided with a pixel electrode facing each other and an electrophoretic element including electrophoretic particles between the counter electrodes; and a temperature detecting means for detecting an environmental temperature Because
A signal indicating that the first potential as a counter potential applied to the counter electrode is changed at least in a writing period on condition that the detected environmental temperature is lower than a temperature threshold is output. Control circuit of electrophoretic display device.   An electronic apparatus comprising the electrophoretic display device according to claim 3.

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