JP2008015007A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device capable of effectively maintaining the display performance of an image even when an electrophoretic display is arranged in a curved state. <P>SOLUTION: The display device 1 is constituted so that an electrophoretic display 15 is arranged in a curved state in a case. The electrophoretic display 15 includes a transparent substrate 21 on which a common electrode 27 is arranged, a display substrate 20 on which a segment electrode 23 is arranged and charged particles arranged between the electrodes 23, 27. Common electrode driving electrodes 24A, 24B are arranged on the display substrate 20. Conductive members 28a, 28B are arranged between the common electrode driving electrodes 24A, 24B and the common electrode 27. The display device 1 is provided with spacer members 32A, 32B for depressing at least one of the transparent substrate 21 and the display substrate 20 to the side of the conductive members 28A, 28B and maintaining such a state that the conductive members 28A, 28B are brought into close contact with respective electrodes 24A, 24B, 27. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a display device, and more particularly to a display device in which an electrophoretic display is arranged in a curved manner.

  Conventionally, an electrophoretic display is known as a thin display. Generally, in an electrophoretic display, a transparent substrate on which a common electrode is disposed, a display substrate on which a display electrode is disposed so as to be opposed to the common electrode, and a display electrode is disposed between the common electrode and the display electrode. And an electrophoretic layer in which charged white particles and black particles are enclosed, and a voltage is applied between the electrodes to adjust the amount of movement of the black particles and white particles to the transparent substrate that is visible from the outside. By doing so, the display color consisting of white and black is adjusted and an image is displayed (see, for example, Patent Document 1). In such an electrophoretic display, common electrode drive electrodes are provided at both ends of the display substrate so as to sandwich the display electrode, and a conductive member is provided between the common electrode drive electrode and the common electrode. By being interposed, voltage is applied to the common electrode.

  By the way, in recent years, development of a display device such as a wristwatch, which is provided on a curved portion of a case by imparting flexibility to the electrophoretic display by using a flexible member for each member of the electrophoretic display, has been advanced. ing.

JP-A 52-70791

  However, since the electrophoretic display having a flat structure and thickness is curved and arranged, the transparent substrate positioned on the outer peripheral side of the curved electrophoretic display and the inner peripheral side of the curved electrophoretic display are positioned. The display substrate is displaced in the surface direction, and the shearing force acts on the conductive member due to the displacement.

  When the conductive member is peeled off from the electrode by this shearing force or a breakage that creates a space inside the conductive member occurs, in the conventional display device, the conductive member is the common electrode and the common electrode driving electrode. And cannot be applied to the common electrode, and there is a possibility that an image cannot be displayed normally.

  An object of the present invention is to provide a display device capable of maintaining good image display performance even when an electrophoretic display is arranged in a curved shape.

  A display device of the present invention is provided between a transparent substrate on which a common electrode is disposed, a display substrate on which a display electrode is disposed so as to be opposed to the common electrode and for controlling display, and between the electrodes. A display device in which an electrophoretic display including charged particles is curved and arranged in a case, and a common electrode driving electrode is arranged on a surface of the display substrate facing the common electrode. A conductive member for conducting the common electrode driving electrode and the common electrode is interposed between the electrode driving electrode and the common electrode, and presses at least one of the transparent substrate or the display substrate toward the conductive member side. And a pressing means for maintaining the conductive member and each electrode in close contact with each other.

  In the present invention having this configuration, since the pressing means is provided, at least one of the transparent substrate and the display substrate can be pressed to the conductive member side, and the conductive member and the common electrode driving electrode and the common electrode are brought into close contact with each other. Can be maintained. As a result, even if the conducting member is peeled off from the electrode portion or a breakage that creates a space inside the conducting member occurs, the conducting member reliably maintains conduction between the common electrode driving electrode and the common electrode. Therefore, the image display performance can be maintained satisfactorily.

At this time, the pressing means may be a spacer member installed between the case and the electrophoretic display.
According to this configuration, the electrophoretic display can be sandwiched between the case and the spacer member, the transparent substrate and the display substrate can be pressed toward the conducting member side, the conducting member, the common electrode driving electrode, and the common electrode The electrode can be kept in close contact. As a result, the conducting member can reliably maintain conduction between the common electrode driving electrode and the common electrode, and can maintain good image display performance.

  Further, in the above configuration, when the conducting member is disposed at an end portion in the bending direction of the electrophoretic display, the pressing means is located on the back surface of the electrophoretic display at the inner side in the bending direction than the end portion in the bending direction. The electrophoretic display may be adhered to the case at a position, and an adhesive unit may be configured to abut the end of the electrophoretic display in the bending direction on the case.

  According to this configuration, the outer peripheral surface of the curved electrophoretic display is the front surface, and the inner peripheral surface of the curved electrophoretic display is the back surface. The bonding means constituting the pressing means adheres the electrophoretic display to the case on the back surface of the electrophoretic display at a position inside the bending direction with respect to the end in the bending direction, and electrophoreses the end where the conducting member is disposed. It is brought into contact with the case by the repulsive force of the display. Thereby, at the end abutting against the case, the curved display substrate can be pressed to the conducting member side by a repulsive force, and the conducting member, the common electrode driving electrode and the common electrode can be kept in close contact with each other, The conduction between the common electrode driving electrode and the common electrode can be reliably maintained, and the image display performance can be maintained well.

  According to the present invention, even if the electrophoretic display is curved and disposed, the conducting member can reliably conduct the common electrode driving electrode and the common electrode, and the image display performance can be maintained satisfactorily.

[First Embodiment]
A first embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view of a timepiece according to the present embodiment, and FIG. 2 is a side view thereof.
As shown in FIGS. 1 and 2, a timepiece 1 that is a display device according to the present invention and is a wristwatch includes a case 2 and a display unit 3 (see FIG. 2) disposed inside the case 2. It is configured.

  The case 2 is provided with a separation part 4 for a user to fit through the wrist and is formed in a substantially C shape in a sectional view, and includes an upper exterior body 6, a cover body 7, a lower exterior body 8, and a back cover 9. It is composed of

The upper exterior body 6 is composed of a thin plate-like member that is curved, and a display window 10 having a substantially rectangular opening is formed at the center of the plane.
The cover body 7 is comprised from transparent glass, and the thickness of the edge part is formed thinly. The cover body 7 is disposed between the upper exterior body 6 and the back cover 9 with the end thereof being pressed inside the upper exterior body 6.

  The sensing unit 12 of the touch sensor 11 is disposed on the upper part (upper side in FIG. 2) of the lower exterior body 8. The back cover 9 is disposed on the entire back side of the case 2.

.
FIG. 3 is a plan view of the display unit.
The display unit 3 includes a control circuit board 14 and an electrophoretic display 15 that is controlled by the control circuit board 14 and displays time and the like, and is configured in a belt shape. The control circuit board 14 and the electrophoretic display 15 are individually manufactured and connected by a connector 16.

  The control circuit board 14 is a flexible printed circuit (FPC) formed from a flexible resin such as polyimide or polyester. The control circuit board 14 is composed of a button battery and includes power for each part. Power supply 17, control controller 18 that controls the entire timepiece 1, drive circuit 19 that includes a driver IC and performs display control of the electrophoretic display 15, and touch sensor 11 do not overlap each other. Has been implemented.

FIG. 4 is a cross-sectional view of an electrophoretic display. However, for the sake of easy understanding, the electrophoretic display is shown two-dimensionally (not curved).
The electrophoretic display 15 includes a display substrate 20, a transparent substrate 21, and an electrophoretic layer 22 provided between the display substrate 20 and the transparent substrate 21.

  Similar to the control circuit board 14, the display board 20 is a flexible board formed of a flexible resin such as polyimide or polyester, and is formed relatively thin compared to the transparent board 21. A plurality of segment electrodes 23 which are display electrodes for controlling the above are provided. Hereinafter, the members provided at the respective positions on the distal end side of the bending direction of the case 2 (right side in FIG. 4) and the central side of the bending direction of the case 2 (left side in FIG. 4) will be referred to as the distal end and the center, respectively. In addition to using positional explanations, if you want to express them all at once, express them without any positional explanation.

  On the upper surface of the display substrate 20, a common electrode driving electrode 24A is provided on the distal end side in the bending direction (right side in FIG. 4) across the segment electrode 23, and the central common electrode is disposed on the central side in the bending direction (left side in FIG. 4). A driving electrode 24B is provided. Further, an adhesive (adhesive layer) 25 is provided on the upper portion of the segment electrode 23, whereby a plurality of microcapsules 26 are bonded on the upper portion of the segment electrode 23. An electrophoretic dispersion liquid is enclosed in the microcapsule 26. In the electrophoretic dispersion liquid, positively charged black particles and negatively charged white particles are mixed. The electrophoretic layer 22 is constituted by the plurality of microcapsules 26.

  A transparent common electrode 27 formed by ITO (Indium-Tin Oxide) deposition or the like is provided on the surface (facing surface) of the transparent substrate 21 facing the display substrate 20. A tip conducting member 28A is interposed between the common electrode 27 and the tip common electrode driving electrode 24A, and a center conducting member 28B is interposed between the common electrode 27 and the center common electrode driving electrode 24B. Is intervening. The conductive members 28A and 28B are made of a conductive adhesive or the like, and are bonded to the common electrode 27 and the common electrode driving electrodes 24A and 24B with a conductive adhesive or the like to be connected to the common electrode 27 and the common electrode driving electrode 24A. , 24B.

  Note that the end portion on the distal end side of the electrophoretic display 15 where the distal conducting member 28A is disposed is referred to as a distal end portion 29A, and the end portion on the central side where the central conducting member 28B is disposed is referred to as a central end portion 29B. To do. These end portions 29A and 29B are indicated by hatching in FIG. 2, and are arranged at positions where they are covered on the inner side of the upper exterior body 6 so that the conductive members 28A and 28B are not exposed from the display window 10. ing.

  Further, the transparent substrate 21, the electrophoretic layer 22, and the display substrate are provided by the transparent substrate side moisture resistant sheet 30 provided on the upper surface side of the transparent substrate 21 and the display substrate side moisture resistant sheet 31 provided on the lower surface side of the display substrate 20. 20 and the like are sealed to prevent moisture from entering the electrophoretic layer 22. More specifically, a hot melt material is applied as an adhesive layer to the inside of the moisture resistant sheets 30 and 31, and the ends of the moisture resistant sheets 30 and 31 are adhered to each other with a vacuum laminator or the like. Is adhered to the display substrate 20 and the transparent substrate 21 to seal the transparent substrate 21, the electrophoretic layer 22, the display substrate 20, and the like on the substrate end surface and the front and back surfaces.

Next, the drawing process will be described.
The drawing process is executed by time update (in this embodiment, time update at one minute intervals) or a display update instruction by touching the touch sensor 11. During the drawing process (rewrite period), in this embodiment, the common electrode 27 is applied by a drive signal (pulse signal) supplied from the control circuit board 14 through the common electrode drive electrodes 24A and 24B and the conductive members 28A and 28B. And alternately applied to 0V and approximately + 15V in 125 ms cycles. Hereinafter, 0V is expressed as L potential and + 15V is expressed as H potential.

  When the predetermined segment electrode 23 is set to the H potential during one period (125 ms) when the common electrode 27 becomes the L potential, the segment electrode 23 is changed to the common electrode 27 between the segment electrode 23 and the common electrode 27. An electric field is generated, and the positively charged black particles in the microcapsule 26 between the segment electrode 23 and the common electrode 27 move to the common electrode 27 side, and the negatively charged white particles become the segment electrode 23 side. Therefore, the display color on the predetermined segment electrode 23 becomes black for one gradation.

On the contrary, if the predetermined segment electrode 23 is set to L potential during one period (125 ms) when the common electrode 27 becomes H potential, it is charged negatively in the microcapsule 26 between the segment electrode 23 and the common electrode 27. The white particles thus moved move toward the common electrode 27 and the positively charged black particles move toward the segment electrode 23, so that the display color on the predetermined segment electrode 23 becomes white for one gradation.
Further, when there is no potential difference between the potential of the common electrode 27 and the predetermined segment electrode 23, the white particles and black particles between the segment electrode 23 and the common electrode 27 do not move, The gradation of the display color on the predetermined segment electrode 23 is maintained.

  That is, the first potential (0 ms to 125 ms) of the potential of the common electrode 27 starts from the L potential, and then the H potential (second cycle), the L potential (third cycle), and the H potential (fourth cycle). , L potential (fifth cycle)... And, for example, when the display color of the predetermined segment electrode 23 is to be black for two tones, the predetermined segment electrode 23 is changed to the H potential for 4 cycles (400 ms) from 0 ms, and thereafter, the L potential in the fifth cycle, the H potential in the sixth cycle, and the L potential in the seventh cycle so as to be the same potential as the common electrode 27 You can apply them alternately.

  In this way, the common electrode 27 becomes the L potential and the predetermined segment electrode 23 becomes the H potential in the first cycle (0 ms to 125 ms) and the third cycle (250 ms to 375 ms). The display color can be made black. At this time, in the second period, since the common electrode 27 and the predetermined segment electrode 23 are both at the H potential, the gradation does not change. In the fourth and subsequent cycles, the common electrode 27 and the predetermined segment electrode 23 are alternately applied with the H potential (fourth cycle) and the L potential (fifth cycle). The potential difference does not occur between the segment electrodes 23, and the gradation of the display color on the predetermined segment electrode 23 is maintained.

  In this manner, for example, an image representing time is displayed on the electrophoretic display 15 by changing the potential of each predetermined segment electrode 23 and setting the display color to the target gradation. When the drawing process (rewrite period) ends, the output terminal for outputting the drive signal of the control circuit board 14 is in a high impedance state, and no potential difference is generated between the common electrode 27 and each segment electrode 23. The image can be maintained until the next time update or display update instruction is issued. In the present embodiment, the drive circuit 19 has a built-in booster circuit and boosts a voltage (for example, 3 V) supplied from the power supply 17 to generate a voltage of approximately +15 V. The +15 V voltage and the 0 V voltage are generated. A voltage is applied to the segment electrode 23 and the common electrode 27.

  In the present embodiment, in such a timepiece 1, the tip spacer member 32A as a pressing means is installed between the cover body 7 and the tip end portion 29A of the electrophoretic display 15 on which the tip conducting member 28A is arranged. A central spacer member 32B, which is a pressing means, is installed between the cover body 7 and the central side end portion 29B where the central conductive member 28B is disposed.

These spacer members 32A and 32B are made of a member having elasticity such as polyimide and urethane rubber, and hardly generating wear powder even if rubbed. The longitudinal direction of the electrophoretic display 15 is provided at each end 29A and 29B. It is attached across from one end to the other in the width direction.
Each spacer member 32A, 32B is placed in a compressed state sandwiched between the cover body 7 and the electrophoretic display 15, so that the transparent substrate 21 is sufficiently directed toward the conductive members 28A, 28B. Pressing with pressing force.

  In this embodiment, the outer peripheral surface of the curved electrophoretic display 15 is the front surface 150, and the inner peripheral surface of the curved electrophoretic display 15 is the back surface 151. Then, on the back surface 151 of the electrophoretic display 15, an adhesive 33, which is an adhesive means, is applied across the end in the width direction at a position a predetermined distance from the front end portion 29 </ b> A and inside the bending direction. Accordingly, the electrophoretic display 15 is bonded to the case 2. In addition to the adhesive 33, a double-sided tape or the like may be used as the bonding means.

The method for assembling the timepiece 1 will be described below.
First, the display unit 3 is positioned and attached to the back cover 9 by the adhesive 33 so that the end portions 29A and 29B of the electrophoretic display 15 cannot be seen from the display window 10. Next, in the upper part of the back cover 9, the cover body 7 and the upper exterior body 6 are superimposed on the electrophoretic display 15, and the electrophoretic display 15 and the cover body 7 are located between the upper exterior body 6 and the back cover 9. Sandwiched between. Then, a fastening screw 13 (see FIG. 1) is screwed into the upper exterior body 6 from the back side of the back cover 9, so that the electrophoretic display 15 and the cover body 7 are placed between the upper exterior body 6 and the back cover 9. The upper part of the timepiece 1 is assembled. At this time, the electrophoretic display 15 may be incorporated after being bent or may be incorporated while being bent.

  In the lower part of the back cover 9, the lower exterior body 8 is superimposed on the control circuit board 14, and the control circuit board 14 is sandwiched between the lower exterior body 8 and the back cover 9. Then, the fastening screw 13 is screwed into the lower exterior body 8 from the back side of the back cover 9, whereby the control circuit board 14 is sandwiched between the lower exterior body 8 and the back cover 9, and the lower part of the timepiece 1. Is assembled. In this way, the entire timepiece 1 is assembled.

Therefore, according to the present embodiment, the following effects can be obtained.
(1) Spacer members 32A and 32B, which are pressing means, are installed in a compressed state between the ends 29A and 29B where the conductive members 28A and 28B of the electrophoretic display 15 are disposed and the cover body 7. Therefore, the end portions 29A and 29B of the electrophoretic display 15 can be sandwiched between the back cover 9 and the spacer members 32A and 32B, and the conductive members 28A and 28B and the electrodes 24A, 24B, and 27 are brought into close contact with each other. Can be maintained.
Therefore, by arranging the electrophoretic display 15 to be curved, the conducting members 28A and 28B may be peeled off from the electrodes 24A, 24B and 27, or a destruction may be generated such that a space is formed inside the conducting members 28A and 28B. Even so, the conducting members 28A and 28B can maintain the conduction between the common electrode 27 and the common electrode driving electrodes 24A and 24B, and can maintain the image display performance satisfactorily.

(2) When the electrophoretic display 15 is placed in a curved shape, the distal end 29A and the case 2 are bonded to the adhesive 33 on the back surface 151 of the electrophoretic display 15 in order to position and fix the electrophoretic display 15. When the display substrate 20 is fixed to the case 2, the transparent substrate 21 is not directly fixed to the case 2, so that the transparent substrate 21 tries to return to its original state when bent. It tries to return to the original plane state by force, that is, repulsive force. Accordingly, when the distal end side end portion 29A and the case 2 are fixed by an adhesive means such as an adhesive 33, a tensile force acts on the distal end conducting member 28A, and the conducting members 28A and 28B are separated from the electrodes 24A, 24B, and 27. Peeling or breakage inside the conductive members 28A and 28B is likely to occur.
On the other hand, in the present embodiment, the adhesive 33 as an adhesive means adheres the electrophoretic display 15 to the case 2 on the back surface 151 of the electrophoretic display 15 at a position on the inner side in the bending direction than the tip end portion 29A. Therefore, the tip end portion 29A where the tip conducting member 28A is disposed is not adhered to the case 2.
For this reason, in this embodiment, compared with the case where the front end portion 29A is bonded to the case 2, particularly during the assembly, the cover body 7 and the upper exterior body are still attached to the case 2 to which the display unit 3 is attached. 6 is not attached, the tip conduction member 28A disposed at the tip end portion 29A is not applied with a tensile force, so that the breakage of the tip conduction member 28A can be suppressed, and the image display performance can be further improved. It can be maintained well. This effect is particularly prominent when the electrophoretic display 15 is attached to the case 2 in a state where the bending folds are not attached, and the tensile force due to the repulsion of the transparent substrate 21 acts strongly on the tip conducting member 28A. it can.

[Second Embodiment]
FIG. 5 is a cross-sectional view of a main part of a timepiece according to the second embodiment of the present invention. In the second and subsequent embodiments, the same functional parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In the second embodiment, the adhesive 33 serving as an adhesive means is electrically applied at a position on the inner side in the bending direction with respect to the distal end side end portion 29A on the point where the distal end spacer member 32A is not provided and on the back surface 151 of the electrophoretic display 15. The electrophoretic display 15 is bonded to the case 2, and the tip side end portion 29 </ b> A is brought into contact with the case 2 by the repulsive force of the electrophoretic display 15. Other configurations are the same as those in the first embodiment. In this embodiment, the pressing means is configured to include an adhesive 33 that is an adhesive means.

Therefore, according to this embodiment, in addition to the effect (2) of the first embodiment, the following effects can be achieved.
(3) The adhesive 33 which constitutes the pressing means and is an adhesive means adheres the electrophoretic display 15 to the case 2 at a position on the inner side in the bending direction from the tip end portion 29A, and the tip end portion 29A is attached to the electrophoretic display. 15, the display substrate 20 can press the tip conducting member 28A by the repulsive force, and the tip conducting member 28A and the electrodes 24A and 27 can be maintained in close contact with each other. The electrode 27 and the tip common electrode driving electrode 24A can be made conductive, and the image display performance can be maintained well.

(4) Since the spacer members 32A and 32B can be made unnecessary, the assemblability can be improved and the cost can be reduced as compared with the case where the spacer members 32A and 32B are installed between the cover body 7 and the electrophoretic display 15.

[Modification of Embodiment]
The present invention is not limited to the above-described embodiment, and includes other configurations and the like that can achieve the object of the present invention, and includes the following modifications and the like.
The spacer members 32 </ b> A and 32 </ b> B may be installed between the electrophoretic display 15 and the back cover 9. For example, in the second embodiment, the tip spacer member 32A is not installed between the tip end portion 29A of the electrophoretic display 15 and the back cover 9, but the tip end portion 29A and the back cover 9 Between them, a tip spacer member 32A similar to that of the first embodiment may be installed. Further, a tip spacer member 32A similar to that of the first embodiment is disposed between the tip end portion 29A and the case 2, and the first end portion between the center end portion 29B and the back cover 9 is also provided. A central spacer member 32B similar to the embodiment may be installed.

Even with such a modification, in addition to the effects (1), (2), and (3) of the first and second embodiments, the following effects can be obtained.
(5) Since the spacer members 32A and 32B are installed between the end portions 29A and 29B of the electrophoretic display 15 and the back cover 9, the spacer members 32A and 32B are not exposed from the display window 10 reliably. The appearance of the timepiece 1 can be improved.

(6) Further, the spacer members 32A and 32B are installed between the end portions 29A and 29B of the electrophoretic display 15 and the back cover 9, whereby the gap between the cover body 7 and the electrophoretic display 15 is reduced. Therefore, it can be set as the structure where parts other than the electrophoretic display 15 inside case 2 are not exposed, and an external appearance can be improved more.

(7) Since the display substrate 20 is formed to be relatively thinner than the transparent substrate 21, the spacer members 32 </ b> A and 32 </ b> B are installed between the display substrate 20 and the back cover 9, Compared with the case where the spacer members 32A and 32B are installed between the cover body 7, the end portions 29A and 29B of the electrophoretic display 15 can be sandwiched more strongly, and the conducting members 28A and 28B can be pressed strongly, thereby providing the conducting member 28A. , 28B can be reliably maintained between the common electrode 27 and the common electrode driving electrodes 24A, 24B.

  In the first embodiment, the back surface 151 of the electrophoretic display 15 is bonded with the adhesive 33 in addition to the spacer members 32A and 32B. However, the spacer 33A and 32B are provided without applying the adhesive 33. Also good.

  Between the end portions 29A and 29B of the electrophoretic display 15 and the case 2, the spacer members 32A and 32B may be installed between the cover body 7 and the back cover 9. The spacer member 32A, 32B is provided between the front end side end portion 29A and the center side end portion 29B and the cover body 7, and the other side is provided with the spacer member 32A, 32B may be provided.

Even if spacer members 32A and 32B having appropriate thicknesses are provided between the end portions 29A and 29B of the electrophoretic display 15 and the cover body 7 and between the end portions 29A and 29B and the back cover 9, respectively. Good.
Further, the positions where the spacer members 32A and 32B are attached are not limited to the positions where the conductive members 28A and 28B are provided, as long as the conductive members 28A and 28B can be pressed by pressing the substrates 20 and 21. It may be around the position where the conducting members 28A, 28B are provided, and may be any position as long as a pressing force at which the conducting members 28A, 28B and the electrodes 24A, 24B, 27 are in close contact with each other can be applied to the electrophoretic display 15. .

The spacer members 32 </ b> A and 32 </ b> B may not be continuously attached to the electrophoretic display 15 from end to end in the width direction, and one spacer member having a length shorter than the width dimension of the electrophoretic display 15 is connected. A plurality of them may be attached. In short, as the spacer members 32A and 32B, the spacer members 32A and 32B can be attached as long as a pressing force at which the conductive members 28A and 28B and the electrodes 24A, 24B and 27 are in close contact with each other can be applied to the electrophoretic display 15. The position and size are not limited.
Further, the spacer members 32A and 32B are not necessarily bonded to the electrophoretic display 15 side, and may be bonded to the case 2 side.

In the above-described embodiment, the electrophoretic layer 22 displays an image with two colors of white and black particles, but may display an image with particles of one color. Further, particles of two colors other than white and black may be used.
Although the button battery which is a primary battery was used for the power supply 17, it is not restricted to this, For example, secondary batteries, such as a flexible lithium polymer battery, may be used.

  In the above embodiment, the case where the present invention is applied to a wristwatch has been described. However, the present invention is not limited to this, and various types of clocks such as a table clock, a wall clock, a wall clock, and a pocket watch are also provided with a curved electrophoretic display. If so, the present invention can be applied. Furthermore, the application of the present invention is not limited to a timepiece, and can be applied to display devices (electronic devices) such as PDAs (Personal Digital Assistants) and mobile phones.

1 is a perspective view of a timepiece according to a first embodiment of the present invention. Sectional drawing of the timepiece of the said embodiment. The top view of the display unit of the embodiment. Sectional drawing of the electrophoretic display of the said embodiment. Sectional drawing of the principal part of the timepiece which concerns on 2nd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Timepiece which is a display apparatus, 2 ... Case, 15 ... Electrophoretic display, 20 ... Display board | substrate, 21 ... Transparent substrate, 23 ... Segment electrode which is a display electrode, 24A, 24B ... Common electrode drive electrode, 27 ... Common electrode, 28A, 28B ... conductive member, 32A, 32B ... spacer member as pressing means, 33 ... adhesive constituting the pressing means, 151 ... back surface.

Claims (3)

A transparent substrate on which a common electrode is disposed, a display substrate on which a display electrode is disposed so as to be opposed to the common electrode and for controlling display, and charged particles provided between the electrodes. A display device in which an electrophoretic display is curved and arranged in a case,
A common electrode driving electrode is disposed on the surface of the display substrate facing the common electrode,
Between the common electrode driving electrode and the common electrode, a conductive member for conducting the common electrode driving electrode and the common electrode is interposed,
A display device, comprising: a pressing unit that presses at least one of the transparent substrate and the display substrate toward the conductive member and maintains the conductive member and each electrode in close contact with each other. The display device according to claim 1,
The display device, wherein the pressing means is a spacer member installed between the case and the electrophoretic display. The display device according to claim 1 or 2,
The conducting member is disposed at an end of the electrophoretic display in a bending direction,
The pressing means adheres the electrophoretic display to the case at a position inside the bending direction on the back surface of the electrophoretic display from the end in the bending direction, and attaches the end of the electrophoretic display in the bending direction to the case. A display device comprising an adhesive means for contacting the case.

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