JP3929510B2 - Movable film type display device - Google Patents

Description

[0001]
[Industrial application fields]
  The present invention relates to a movable film type display device having a completely new structure.
[0002]
[Prior art]
  A display used for a portable information device is desired to be thin, light and have low power consumption. Conventionally, as a thin display, a liquid crystal display (LCD), a plasma display, a flat CRT, and the like are known. Among these, the LCD is most suitable and put into practical use in view of power consumption.
[0003]
  An LCD in which the display surface of the display is directly viewed is called a direct view type. Direct-view LCDs include a transmissive type that incorporates a light source such as a fluorescent lamp on the back surface and a reflective type that utilizes ambient light. Of these, the former requires a backlight and is not suitable for low power consumption.
Therefore, the latter reflective type is most popular as a display for portable information devices.
[0004]
  The reflective LCD uses an ECB (Electrically Controlled Birefringence) mode, a GH (Guest Host) mode, a TN (Twisted Nematic) mode, or the like. When using the ECB mode or the TN mode, a polarizing plate is necessary. Since the polarizing plate has a light transmittance of about 40%, the light utilization efficiency deteriorates.
[0005]
  In the case of using the GH mode, a polarizing plate is not necessary. However, in order to display full color, it is necessary to stack three or more monochromatic liquid crystal cells having a transmittance of about 80%. Therefore, the light utilization efficiency does not increase so much, and a color display device cannot display paper white with a reflectance of about 50%.
[0006]
  In the case of color display, when the ECB mode or GH mode is used, a color filter is not necessary, but the color reproduction ability is low and the viewing angle dependency is large.
  In the case of using the TN mode, a color filter is used for coloring, but since it is a reflection type, the light use efficiency becomes about 1/3 and it becomes dark.
[0007]
  In addition to these, since a TFT (Thin Film Transistor), a TFD (Thin Film Diode), or the like is provided as a switch in these, the aperture ratio becomes low.
[0008]
  When the light use efficiency is low and the aperture ratio is low, the reflection luminance is lowered and the screen becomes dark.
  By the way, power consumption does not become zero even in a reflective LCD. This is because when a DC voltage is applied to the liquid crystal molecules, the deterioration of the liquid crystal molecules is a concern, so that even when a still image is displayed, an AC voltage of 60 Hz or higher is driven. The power consumption is proportional to this frequency. On the other hand, if the size of the display device is not limited, a mechanical matrix display device used for a large bulletin board or the like is promising from the viewpoint of low power consumption. Since this is a mechanical type, it does not consume power when displaying a still image. In other words, once the operation stops, it does not move as it is, so to speak, it has a non-volatile memory effect. Therefore, power consumption is zero.
[0009]
  As the most commonly used mechanical matrix display device, one pixel is composed of a cube having a side of several centimeters, and four types of colors are added to the four sides, and the other two sides are rotated about the axis. is there. This method can often be found at the station square. However, a disadvantage of this method is that only four colors can be displayed.
[0010]
  As a solution to this problem, as disclosed in Japanese Patent Laid-Open No. 56-150786 (deletion of rights), the pixels are formed into pellets (plates) instead of cubes, a plurality of pellets of a plurality of colors are stacked, and these are stacked in a staircase pattern. There is a method of displaying four or more colors by using a different screen. However, it is difficult to materialize this structure, and it has not been realized yet.
[0011]
  Since these structures are complicated, they are said to be unsuitable for small display devices, and are mainly intended for large display boards such as signboards and bulletin boards in squares. The driving force also uses an electromagnetic motor or electromagnetic solenoid, and there is a limit to its small size. Therefore, it is not suitable as a small and low power consumption display device for a portable terminal.
[0012]
  The reason why electromagnetic forces such as electromagnetic motors and electromagnetic solenoids are unsuitable as a small and low power consumption display device is that the electromagnetic force is proportional to the current and the number of turns of the coil. The fact that current needs to flow means that it consumes power (however, still images do not consume power for the above reasons), and winding a coil is disadvantageous for miniaturization. Become.
[0013]
  On the other hand, electrostatic force is suitable for small and low power consumption. In brief, the electrostatic force is
This is the force that acts between the electrodes of the capacitor. Since it is a capacitor, current flows for a moment and consumes little power. Moreover, since it is not necessary to wind a coil, it is advantageous for miniaturization.
[0014]
  There is already a display device using such an electrostatic force (Nikkei Electronics, page 38, December 12, 1977), and it has already been commercialized as a large display board. This structure isFIG.As shown in FIG. 2, the foil with the electrodes is moved by electrostatic force between the fixed electrodes and two colors can be displayed. That is, apply different colors to the front and back of the foil,
In addition, a color is applied to the fixed electrode, and two colors are displayed by moving the foil.
One side of the foil and one of the fixed electrodes may be mirrored with an aluminum thin film.
[0015]
  However, this display device can basically display only two colors or three colors by using two foils. With this, full color display is not possible. For example, assume that red, blue and green are selected as three colors. In this case, white, black, yellow, or other colors cannot be displayed on the entire screen. This is the reason why it is difficult to achieve full color in the reflective display device. If it is a light emitting type like a cathode ray tube, a full color can be displayed only by the distribution of three colors of red, blue and green.
[0016]
[Problems to be solved by the invention]
  This summarizes the problems of the conventional technology.
  There is a need for a portable color display device that is small and consumes low power, and the most promising reflective LCD at present can only produce dark ones with a reflectance of 50% or less, and paper white full-color display cannot be expected. In this method, the power consumption is not completely zero even in a still image.
[0017]
  On the other hand, the mechanical matrix display can reduce power consumption to zero in still images, but currently there are only large display devices using electromagnetic force due to the complexity of the structure. A small display device is not possible.
[0018]
  Further, a display device using a low power consumption electrostatic force suitable for a small size can display only two or three colors per pixel at present. Therefore, full color display cannot be expected.
[0019]
  The present invention has been made in view of the above-described problems, and a movable film type display device that can achieve paper white full color with high reflection luminance, low power consumption, and particularly zero power consumption for still images. The purpose is to provide.
[0020]
[Means for Solving the Problems]
  The movable film type display device of the present invention for solving the above problem includes a plurality of first color fixed portions each having a pixel region on the surface,
  A second color display section, a movable drive electrode section, and a bent section that freely bends the display section and the movable drive electrode section;pluralA movable film,
  Arranged to face the movable drive electrode partMultiple fixed drive electrodesWhen,
  The movable drive electrode portion;The fixed drive electrodeDriving means for applying a potential difference to
  Of the movable drive electrode sectionThe end is fixedA substrate, and
  The movable drive electrode part is disposed perpendicular to the fixed part,Fixed drive electrodeCan be bent to the side,
  The bending of the movable drive electrode part is performed by the movable drive electrode part and theFixed drive electrodeUsing the electrostatic force due to the potential difference between
  The display unit is disposed so as to pass through a gap formed between the fixed parts adjacent to each other, and is exposed to the surface of the fixed part by bending of the movable drive electrode part and the adjacent fixed part. It is characterized in that it can be hidden from the back side.
[0021]
  In the present invention, the aboveFixed drive electrodeAre first and second fixed drive electrodes sandwiching the movable drive electrode portionMade up ofMay be.
[0022]
  In the present invention, the fixed part may be made of a white opaque film-like material, and the display part may be made of a black opaque film-like material.
[0023]
  Further, the movable film type display device of the present invention comprises a plurality of fixed portions comprising a pixel region on the surface and made of a white opaque film-like material,
  A first display portion made of a transparent film material colored in cyan, a first movable drive electrode portion, and the first display portion and the first movable drive electrode portion are freely bent. Having a first bendpluralA first movable film;
  The second display portion made of a transparent film material colored magenta, the second movable drive electrode portion, and the second display portion and the second movable drive electrode portion are freely bent. Having a second bendpluralA second movable film;
  A third display portion composed of a transparent film material colored yellow, a third movable drive electrode portion, and the third display portion and the third movable drive electrode portion are freely bent. Having a third bendpluralA third movable film;
  The first, second, and third movable drive electrode portions are disposed to face each other.pluralFirst, second and third fixed drive electrodes;
  The first, second and third movable drive electrode portions and the first, second and thirdFixed drive electrodeDriving means for applying a potential difference to
  The first, second and third movable drive electrode portions;The end is fixedA substrate, and
  The first, second, and third movable drive electrode portions are arranged perpendicular to the fixed portion so as not to overlap with each other, and the first, second, and thirdFixed drive electrodeCan be bent to the side,
  The bending of the first, second, and third movable drive electrode portions is the same as that of the first, second, and third movable drive electrode portions and the first, second, and third, respectively.Fixed drive electrodeUsing the electrostatic force due to the potential difference between
  The first, second, and third display portions are disposed so as to pass through a gap formed between the fixing portions adjacent to each other, and the first, second, and third movable drive electrodes, respectively. It is possible to take a state of being exposed on the surface of the fixed part and a state of being hidden on the back surface of the adjacent fixed part by bending the part.
[0024]
  In the present invention, a fourth display unit made of a black opaque film-like material,
A fourth movable driving electrode section, and a fourth bent section that freely bends the fourth display section and the fourth movable driving electrode section;pluralA fourth movable film;
  Disposed opposite the fourth movable drive electrode portion.plural4thFixed drive electrodeWhen,
  The fourth movable drive electrode section and the fourth movable drive electrode section;Fixed drive electrodeDriving means for applying a potential difference to
  Of the fourth movable drive electrode section.The end is fixedA substrate, and
  The fourth movable drive electrode portion is disposed perpendicular to the fixed portion so as not to overlap any of the first, second, and third movable drive electrode portions, andFixed drive electrodeCan be bent to the side,
  The bending of the fourth movable drive electrode section is the same as that of the fourth movable drive electrode section and the fourth movable drive electrode section.Fixed drive electrodeUsing the electrostatic force due to the potential difference between
  The fourth display unit is disposed so as to be able to pass through a gap formed between the fixed units adjacent to each other, and is exposed to the surface of the fixed unit by bending of the fourth movable drive electrode unit. It may be configured to be able to take a state of being hidden on the back surface of the adjacent fixing portion.
[0025]
  Moreover, in this invention, the said display part may have the electroconductive part by an electroconductive substance.
[0026]
  In the present invention, the display section and the movable drive electrode section may be bonded with an adhesive.
[0027]
  Further, in the present invention, further comprising a holding electrode formed on the fixed portion and arranged to face the display portion, and holding means for applying a potential to the holding electrode,The display section, Utilizing the electrostatic force generated when the holding means gives a potential difference between the holding electrode and the display unit.FixedIt may be.
[0028]
  In the present invention, the fixed portion, the movable film, and theFixed drive electrodeAre arranged in a matrix and the movable drive electrode section is connected to a signal line,Fixed drive electrodeMay be connected to the scanning line.
[0029]
  In the present invention, the fixed portion, the movable film, and theFixed drive electrodeAre arranged in a matrix, the movable drive electrode section is connected to a first scanning line, the first fixed drive electrode is connected to a signal line, and the second fixed drive electrode is a second May be connected to the scanning line.
[0030]
  Moreover, the movable film type display device of the present invention includes a plurality of first color fixed portions each having a pixel region on the surface,
  It has a second color display section, a movable drive electrode section, and a bent section that freely bends the display section and the movable drive electrode section, and consists of an electretpluralA movable film,
  Arranged to face the movable drive electrode partMultiple fixed drive electrodesWhen,
  The movable drive electrode section and theFixed drive electrodeDriving means for applying a potential difference to
  Of the movable drive electrode sectionThe end is fixedA substrate, and
  The movable drive electrode part is disposed perpendicular to the fixed part,Fixed drive electrodeCan be bent to the side,
  The bending of the movable drive electrode part is performed by the movable drive electrode part and theFixed drive electrodeUsing the electrostatic force due to the potential difference between
  The display unit is disposed so as to pass through a gap formed between the fixed parts adjacent to each other, and is exposed to the surface of the fixed part by bending of the movable drive electrode part and the adjacent fixed part. It is characterized in that it can be hidden from the back side.
[0031]
  Moreover, the movable film type display device of the present invention includes a plurality of first color fixed portions each having a pixel region on the surface,
  A second color display unit, a movable drive electrode unit made of a bimorph piezoelectric film, and a bent portion that freely bends the display unit and the movable drive electrode unit;pluralA movable film,
  Drive means for applying a potential difference to the movable drive electrode portion;
  Of the movable drive electrode sectionThe end is fixedA substrate, and
  The movable drive electrode part is arranged perpendicular to the fixed part and can be bent,
  The bending of the movable drive electrode part uses a bending force due to a potential difference applied to the movable drive electrode part,
  The display unit is disposed so as to pass through a gap formed between the fixed parts adjacent to each other, and is exposed to the surface of the fixed part by bending of the movable drive electrode part and the adjacent fixed part. It is characterized in that it can be hidden from the back side.
[0032]
[Action]
  According to the present invention, the movable film installed on the fixed portion is moved by the driving portion by electrostatic force, and this is used as a pixel, that is, a display portion, and a screen is displayed. Since a colored film is used to display the screen, a polarizing plate is not required, and since there is no liquid crystal layer having a low transmittance, the light utilization efficiency is increased. Further, since the drive unit is formed so as not to disturb the display of the display unit, the aperture ratio becomes extremely high. As a result, the reflection luminance is increased. Also, since it is mechanical, it does not consume power when displaying still images. In other words, once the operation stops, it does not move as it is, so to speak, it has a non-volatile memory effect. Therefore, power consumption is zero.
[0033]
【Example】
  Hereinafter, the details of the present invention will be described using examples.
  FIG. 1 shows an enlarged cross-sectional view of one pixel of a movable film type display device according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a movable film, which includes a movable drive electrode unit 2 and a display unit 6. Reference numeral 3 denotes a fixed drive electrode. Reference numeral 5 denotes a white plate.
[0034]
  The base of the movable film 1 is fixed to a substrate (not shown). In other words, the movable film 1 is in a “cantilever” state, and can be bent to the left or right in the drawing.
[0035]
  Further, the bent portion that separates the movable film display portion 6 and the movable drive electrode portion 2 is freely bent.
  As a display principle, a display unit 6 colored in black or other color through a gap between five white plates is taken in and out of the pixel region 36 to display black and white or color. As a method of moving the movable film, a potential difference is given to one of the fixed drive electrodes 3 with respect to the movable drive electrode unit 2 and an electrostatic force acting on the movable film 2 is used. In the movable film type display device described in this embodiment, the above-described one pixel is two-dimensionally formed in a matrix to form a display device. 2 and 3 are sectional views of the schematic overall configuration of the display device.
[0036]
  The ratio of the length of the movable film display section 6 to the movable drive electrode section 2 is preferably as large as possible as shown in FIG. 2, and in particular, (the length of the display section 6) / (the length of the movable drive electrode section 2). Is preferably from 0.01 to 0.1 in view of the ease of movement of the display electrode.
[0037]
  FIG. 2 is a cross-sectional view in the case of black and white display, and the black display electrode 6 is put in and out from the gap of the white plate 5.
  FIG. 3 is a cross-sectional view in the case of color display, and transparent films colored with 14 cyan, 15 magenta, and 16 yellow are put in and out of the gaps of the white plate 5 to display the same color display as the printed matter. For example, when colors other than 14, 15, 16 are output, yellow and magenta are overlapped for red, cyan and magenta are overlapped for blue, and cyan and yellow are overlapped for green. Take out.
[0038]
  In the case of gradation display, an area gradation method is used, and a colored film is provided only in a specific portion of the pixel region 36. For example, when displaying pink, which is an intermediate color between red and white, yellow and magenta films are overlapped to reach the half of the pixel area 36. In this way, the area ratio of white and red in the pixel becomes 1: 1, and intermediate pink can be displayed. This is the same as the gradation display method for printed matter.
[0039]
  FIG. 4 is a perspective view showing the structure of one pixel capable of performing binary display such as monochrome display of the movable film type display device. In the following description, the parts described above are given the same numbers, and detailed description thereof is omitted.
[0040]
  FIG. 5 shows the arrangement of the movable film in the case of performing color display, which is a modification of the structure of one pixel in this embodiment. Three movable films with transparent display portions colored cyan 14, magenta 15 and yellow 16 are stacked, so that any combination of the three colors can be output to the pixel portion from the white plate gap. It has become.
[0041]
  FIG. 6 is also a modified example of the structure of one pixel in this embodiment, and the display pattern protrudes from the central portion of the display unit, which is more balanced than the modified example of FIG. However, it is effective in an ultra-high-definition display where there is a color shift and pixels are not visually recognized.
[0042]
  Next, the relationship between the movable film 1 and the movable electrode portion 2 will be mainly described with respect to the sectional structure of the movable film 1 itself. If the movable film 1 is made of a conductive material such as a metal foil, the movable film 1 itself can also serve as the movable electrode portion 2. However, when the movable film 1 is made of an insulating material such as a polymer film or a glass film, the conductive material needs to be in close contact with the movable film 1.
[0043]
  FIG. 7 is a diagram showing the position of the movable electrode portion 2 made of a conductive material with respect to the movable film 1 of the present embodiment. The manufacturing method will be described later. In the case of FIG. 7, the movable electrode portion 2 made of a conductive material is provided on the side of the movable film 1 where the display portion 6 is present.
[0044]
  FIG. 8 shows a modification of the structure of FIG. 7, and an insulating film 9 may be further coated on the conductive material of the movable electrode portion 2 as shown.
  FIG. 9 is also a modification of the structure of FIG. 7, but the position of the movable electrode portion 2 may be brought to the opposite side of the display portion 6 as shown.
[0045]
  As will be described later, it is necessary to provide conductivity to the display unit 6 for the holding operation.
  In FIG. 10, the conductive portion (electrode) for the holding operation is made of a conductive material common to the movable electrode portion 2 described above. At this time, the conductive material may be made transparent.
[0046]
  Further, as shown in FIG. 11, a conductive portion for holding operation may be provided to avoid the portion of the display area that is actually used.
  FIG. 12 shows a modification in which the movable electrode portion 2 and the conductive portion 10 for holding operation are separate electrodes.
In particular, 10 is preferably a transparent electrode.
[0047]
  In FIG. 13, the movable film 1 itself is an electret 11, which is not conductive, but the electric charge in the electret is attracted by an electrostatic field, and the movable film can be moved.
[0048]
  FIG. 14 shows a modification in which the polymer materials of the display unit 6 and the movable electrode unit 2 are changed. The display unit 6 needs to be transparent for color display, but the movable electrode unit 2 does not need to be transparent, but has heat resistance for convenience of coating with metal or insulating film. Is preferable. Therefore, it is preferable to use a transparent film such as polyester for the display portion 6 and heat resistant polyimide for the film near the movable electrode portion. As an adhesion method between the films, an adhesive may be used. However, if the film is thermoplastic, it may be adhered without being melted by heat.
[0049]
  Although FIG. 15 is also a modified example, the bending force of the bimorph type piezoelectric film 7 shown in the figure may be used as a driving method of the movable film 1 as described above. Reference numeral 40 denotes a power source for applying a voltage to the bimorph type piezoelectric film 7.
[0050]
  Next, the details of the operation principle will be described. First, as shown in FIG. 16, an electric field is generated by applying a potential difference between two fixed drive electrodes 3 sandwiching the movable film 1. At this time, the same potential as that of either one of the fixed electrode portions 3 is applied to the movable electrode portion 2 of the movable film 1. Then, the movable electrode portion of the movable film is pulled by one of the fixed drive electrodes 3 and stops in contact therewith. A capacitor formed between the movable electrode portion 2 and the fixed drive electrode 3 of the movable film 1 will be referred to as a drive capacitor (Cd; Driving Capacitor).
[0051]
  If the potential relationship between the two fixed drive electrodes 3 is reversed, the movable film 1 is pulled in the opposite direction. At this time, the force F acting on the movable film can be expressed by the following equation (1).
[0052]
    F = εSV²  / (2d²  (1)
Here, ε represents the dielectric constant, S represents the smaller one of the movable electrode portion 2 and the fixed drive electrode 3, and d represents the distance between the movable electrode portion and the fixed drive electrode.
[0053]
  For example, assuming a pixel pitch of 300 μm, d = 300 μm, and S of 0.9 mm²  And Also, if air is clogged between the movable electrode portion 2 and the fixed drive electrode 3,
    ε = 8.85 × 10¹²
When the potential difference V is 200 V, the generated force F in this case is
    F = 3.54 × 10^-6[N] = 0.36 [mgf] (2)
It becomes. At this time, the movable film weighs about 1 μg and there is no problem in driving. The film is assumed to be polymer, glass, carbon fiber, metal foil, etc., and has an elastic modulus of 100 to 10000 kg / mm.²  As a result of the experiment, it was found that it can be driven sufficiently with the above-mentioned force.
[0054]
  Although the case where two fixed drive electrodes 3 are used has been described, the movable film can be sucked even if only one of them is used. At this time, the bending elastic force of the film itself is used to return the movable film. To do.
[0055]
  Next, the function of the holding electrode 4 shown in FIG. 16 will be described. As described above, the display unit 6 is black or colored and transparent, but is further coated with a transparent electrode. This is called a display electrode 37. Then, as shown in FIG. 16, the holding electrode and the display electrode form a capacitor through the insulating film and the gap. This is called a holding capacitor (Ch). When a potential difference is applied between the holding electrode 4 and the display electrode 37, an electrostatic attraction as shown in the formula (1) works and the movable film 1 can be fixed. As will be described later, in the case of dot matrix display, the fixed drive electrode 3 described above cannot be fixed at a constant potential because it may be in common with the signal line potential or the scanning line potential. Therefore, by keeping the holding electrode 4 at a constant potential, the movable film can be fixed regardless of the signal line potential or the scanning line potential. At this time, a DC voltage is applied to the capacitor Ch composed of the holding electrode 4 and the display electrode 37, and there is no power consumption in a steady state. This means that it has a memory function, and zero power consumption can be achieved in the still image display state.
[0056]
  The holding electrode 4 has a gradation control function. That is, as described above, the display device produces gradation using the area gradation method, and therefore, the movable film that moves the display unit must be stopped at a predetermined position. The display unit cannot be stopped at a predetermined position only by the above-described fixed drive electrode and the movable electrode portion of the movable film, that is, Cd. Here, it has been found from experiments that the display unit can be moved and stopped by a predetermined gradation by controlling the timing of voltage pulses applied to the driving capacitor Cd and the holding capacitor Ch. Since this gradation display function can control the display portion in an analog manner, a full color display can be realized.
[0057]
  Further, as shown in FIG. 17, the transparent electrode 8 may be provided on the cover glass, and the holding capacitor Ch may be formed between the electrodes on the white plate 5. In this case, it is not necessary to form an electrode on the display unit 6.
[0058]
  Next, the material and manufacturing method of the display device will be described.
  Movable film 1,Fixed drive electrode 3As the material of the white plate 5 and the display unit 6, as an electrically insulating part, polyester such as polyethylene terephthalate (PET), polyimide, nylon, polystyrene, polycarbonate, polymethyl methacrylate, polyethylene, polypropylene, polyethersulfone, Organic polymer films such as polytetrafluoroethylene and polyphenyl sulfite and their copolymers, or inorganic materials such as glass, carbon fiber, mica, silicon oxide, silicon nitride, aluminum nitride, etc. are workable, heat resistant, and transparent It is preferable in terms of As the conductive portion, a single metal or an alloy such as aluminum, copper, gold, silver, nickel, chromium, iron, molybdenum, titanium, tungsten, and tantalum is preferable from the viewpoint of electrical conductivity and workability. The main body of the movable film is made the above-mentioned electrically insulating substance, and the above-mentioned conductive substance may be coated thereon, and further, the above-mentioned insulating substance may be coated. An insulating material may be coated.
[0059]
  For example, copper is deposited or sputtered on a 12 μm thick PET film to a thickness of about 10 nm to 1 μm, and the metal corresponding to the display portion is removed by etching, and transparent ink such as black opaque or cyan / magenta / yellow is used. The display unit 6 is coated in the range of 100 nm to 10 μm, and this is designated as the movable film 1.
[0060]
  Alternatively, the ink may be coated on the surface opposite to the surface coated with metal in advance, and the ink may be patterned before the metal is etched away.
  For example, if the pixel pitch is 300 μm, the film is about 290 μm wide,
Cut to a length of about 6 mm, arrange a plurality of pieces at a pitch of 300 μm, and fix them with adhesive tape.
In order to electrically connect the electrodes on the movable film to each other, they may be arranged with a conductive tape.
[0061]
  Next, the film near the display area is bent about 90 degrees. In order to bend the film, the film is put into a mold and the temperature is raised above the softening point of the film.
  On the other hand, a method for manufacturing the above-described fixed drive electrode will be described. Copper is deposited on a 2 μm thick PET film by vapor deposition or sputtering to a thickness of about 10 nm to 1 μm. This may be further coated with an insulating film. This film is cut to a width of 3 mm to form a tape. Further, they are arranged at a pitch of 300 μm.
[0062]
  FIG. 18 shows an assembly view of the display device.The movable film assembly member 28 is formed by arranging the movable films 1 as described above in a strip shape. The fixed drive electrode assembly members 23 and 24 are obtained by arranging a plurality of fixed drive electrodes 3. The movable film assembly member 28 is disposed between the fixed drive electrode assembly members 23 and 24.Put in.Movable film 1Is electrically connected in the depth direction in the figure, and its end is connected to the TAB-IC 19 via the anisotropic conductive rubber 22. thisMovable film 1Can be used as a scanning line. Fixed drive electrodeAssembly member23 is connected to the signal line 25 on the base substrate 26 via the anisotropic conductive film 21,Fixed drive electrode assembly memberA scanning line 24 is connected to the TAB-IC 19 via the line 22.
[0063]
  An adhesive may be attached to the roots of the movable film 1 and the fixed drive electrode serving as the scanning line 24 and the signal line 25, and they may be bonded to each other to prevent positional deviation. Alternatively, a strong image frame may be prepared and the end of the film may be fixed thereto to prevent the film from shifting.
[0064]
  Further, the display unit 6 of the movable film 1 can be taken out from the gap between the white plates 5. An electrode may be formed on the white plate 5 and used as the holding electrode 4. In this case, as shown in FIG. 18, this electrode itself is a scanning line and may be connected to the TAB-IC 18. Furthermore, although not always necessary, a cover glass 17 as a protective substrate is attached, and a movable film or a fixed drive electrode is sealed in an inert gas atmosphere such as nitrogen to charge the surface of the electrode. It is preferable because dust can be prevented from adhering.
[0065]
  Next, a matrix display driving method will be described.
  FIG.Is a form in which the movable electrode portion 2 of the movable film 1 with the display portion 6 is connected to the signal line 33 and the two fixed drive electrodes 3 are connected to the scanning line 32. The signal line 33 can be set to a power supply voltage, a floating potential, or a ground potential, and can be controlled by a synchronization signal and a video signal input from the outside. In addition, there are two scanning lines for one pixel, and the potential can be set to a power supply voltage, a floating potential, or a ground potential, which is also controlled by an externally input synchronization signal and video signal.
be able to.
[0066]
  FIG.Is the case where the movable electrode portion 2 of the movable film 1 with the display portion 6 is connected to the scanning line 34, one of the two fixed drive electrodes 3 is connected to the signal line 33, and the other is connected to the scanning line 32. Any of the scanning lines 34 and the signal lines 33 can be set to a power supply voltage, a floating potential, and a ground potential, and can be controlled by a synchronization signal and a video signal input from the outside.
[0067]
  The display device of the present invention is a reflection type. Since the reflectance is high, paper white display is possible. In principle, the color reproduction range is wide, the price is low, and the weight is light. Further, since it is a film substrate, any number of large display devices can be manufactured. In addition, since it has a memory function in principle, it has an ability to hold an image even when the power is turned off, and a current does not flow much even during driving, resulting in very low power consumption. This display device can be applied to portable information devices and personal computers that require low power consumption, as well as electronic books, electronic newspapers, electronic notebooks, electronic posters, signboards, control device console panels, and the like. Since this display device can display vivid colors as in gravure printing, new applications other than those described above are also conceivable.
  The present invention is not limited to the above embodiments, and can be implemented with various modifications.
[0068]
【The invention's effect】
  As described above, according to the present invention, a movable film type display device having high reflection luminance can be provided.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part of a movable film type display device according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of an essential part of a movable film type display device according to an embodiment of the present invention.
FIG. 3 is a cross-sectional view of a main part of a movable film type display device according to an embodiment of the present invention.
FIG. 4 is a perspective view of a main part of a movable film type display device according to an embodiment of the present invention.
FIG. 5 is a perspective view of a movable film according to an embodiment of the present invention.
FIG. 6 is a perspective view of a movable film according to an embodiment of the present invention.
FIG. 7 is a sectional view of a movable film according to an embodiment of the present invention.
FIG. 8 is a sectional view of a movable film according to an embodiment of the present invention.
FIG. 9 is a sectional view of a movable film according to an embodiment of the present invention.
FIG. 10 is a sectional view of a movable film according to an embodiment of the present invention.
FIG. 11 is a sectional view of a movable film according to an embodiment of the present invention.
FIG. 12 is a sectional view of a movable film according to an embodiment of the present invention.
FIG. 13 is a sectional view of a movable film according to an embodiment of the present invention.
FIG. 14 is a sectional view of a movable film according to an embodiment of the present invention.
FIG. 15 is a cross-sectional view of a movable film according to an embodiment of the present invention.
FIG. 16 is a sectional view of a movable film according to an embodiment of the present invention.
FIG. 17 is a sectional view of a movable film according to an embodiment of the present invention.
FIG. 18 is an exploded view of a movable film type display device according to an embodiment of the present invention.
FIG. 19The circuit diagram at the time of carrying out the matrix display of the display apparatus of the Example of this invention
FIG. 201 is a circuit diagram of a movable film type display device according to an embodiment of the present invention.
FIG. 21Sectional view of a conventional display device using electrostatic force
[Explanation of symbols]
1 ... Movable film
2. Movable electrode part
3 ... fixed drive electrode
4 ... Holding electrode
5 ... White plate
6 ... Display section
7 ... Bimorph type piezoelectric film
8 ... Cover glass with transparent electrode
9 ... Insulating film
10 ... Transparent electrode
11 ... electret
12 ... Polyimide film
13 ... Polyester film
14: Display section (cyan)
15 ... Display (Magenta)
16 ... Display section (yellow)
17 ... Cover glass
18 ... TAB-IC (for holding electrode)
19 ... TAB-IC (for scanning lines)
20 ... TAB-IC (for signal line)
21 ... ACF (anisotropic conductive film)
22 ... ACF (anisotropic conductive film) silicon rubber pressure bonding type
23 ...Fixed drive electrode assembly member(For signal line)
24 ...Fixed drive electrode assembly member(For scanning lines)
25 ... Signal line
26 ... Base substrate
32 ... Scanning line (for fixed drive electrode)
33 ... Signal line
34 ... Scanning line (for movable electrode)
36: Pixel region
37 ... Display electrode

Claims (12)

A plurality of first color fixing portions each having a pixel region on the surface;
A plurality of movable films having a second color display section, a movable drive electrode section, and a bending section that freely bends the display section and the movable drive electrode section;
A plurality of fixed drive electrodes disposed to face the movable drive electrode portion;
Drive means for providing a potential difference between the movable drive electrode portion and the fixed drive electrode ;
A substrate to which an end of the movable drive electrode portion is fixed ,
The movable drive electrode portion is arranged perpendicular to the fixed portion and can be bent toward the fixed drive electrode side,
The bending of the movable drive electrode portion uses an electrostatic force due to a potential difference between the movable drive electrode portion and the fixed drive electrode ,
The display unit is disposed so as to pass through a gap formed between the fixed parts adjacent to each other, and is exposed to the surface of the fixed part by bending of the movable drive electrode part and the adjacent fixed part. A movable film type display device characterized in that it can be hidden on the back surface. The fixed drive electrodes, the movable film display device according to claim 1, characterized in that it consists of first and second fixed driving electrodes sandwiching the movable driving electrode portion.   The movable film type display device according to claim 1, wherein the fixed portion is made of a white opaque film-like material, and the display portion is made of a black opaque film-like material. A plurality of fixing portions each having a pixel region on the surface and made of a white opaque film-like material;
A first display portion made of a transparent film material colored in cyan, a first movable drive electrode portion, and the first display portion and the first movable drive electrode portion are freely bent. A plurality of first movable films having a first bent portion;
The second display portion made of a transparent film material colored magenta, the second movable drive electrode portion, and the second display portion and the second movable drive electrode portion are freely bent. A plurality of second movable films having a second bent portion;
A third display portion composed of a transparent film material colored yellow, a third movable drive electrode portion, and the third display portion and the third movable drive electrode portion are freely bent. A plurality of third movable films having a third bent portion;
A plurality of first, second and third fixed drive electrodes respectively disposed opposite to the first, second and third movable drive electrode portions;
Drive means for providing a potential difference between the first, second and third movable drive electrode portions and the first, second and third fixed drive electrodes ;
A substrate on which end portions of the first, second and third movable drive electrode portions are fixed ,
The first, second, and third movable drive electrode portions are arranged perpendicular to the fixed portion so as not to overlap with each other, and are directed to the first, second, and third fixed drive electrode sides. Bendable,
The bending of the first, second, and third movable drive electrode portions is made between the first, second, and third movable drive electrode portions and the first, second, and third fixed drive electrodes , respectively. Utilizes electrostatic force due to potential difference,
The first, second, and third display portions are disposed so as to pass through a gap formed between the fixing portions adjacent to each other, and the first, second, and third movable drive electrodes, respectively. A movable film type display device characterized by being able to take a state of being exposed on the surface of the fixed part and a state of being hidden on the back surface of the adjacent fixed part by bending the part. A fourth bending portion that freely bends the fourth display portion, the fourth movable drive electrode portion, and the fourth display portion and the fourth movable drive electrode portion, which are made of a black opaque film-like material. A plurality of fourth movable films having a portion;
A plurality of fourth fixed drive electrodes arranged to face the fourth movable drive electrode part ,
The drive means gives a potential difference to the fourth movable drive electrode portion and the fourth fixed drive electrode,
The fourth movable drive electrode portion has an end fixed to the substrate and is perpendicular to the fixed portion so as not to overlap any of the first, second and third movable drive electrode portions. Arranged and bendable to the fourth fixed drive electrode side;
The bending of the fourth movable drive electrode portion uses an electrostatic force due to a potential difference between the fourth movable drive electrode portion and the fourth fixed drive electrode ,
The fourth display unit is disposed so as to pass through a gap formed between the fixed units adjacent to each other, and is exposed to the surface of the fixed unit by bending the fourth movable drive electrode unit. The movable film type display device according to claim 4, wherein the movable film type display device can take a state of being hidden by a back surface of the adjacent fixed portion. The movable film type display device according to claim 1, wherein the display unit includes a conductive portion made of a conductive substance. The movable film type display device according to claim 1, wherein the display unit and the movable drive electrode unit are bonded with an adhesive. A holding electrode formed on the fixed portion and disposed to face the display portion;
Holding means for applying a potential to the holding electrode,
Wherein the display unit, the movable film display device according to claim 6, wherein said holding means is fixed by using the electrostatic force generated by applying a potential difference and the display section and the holding electrode. The pixels having the fixed portion, the movable film, and the fixed drive electrode are arranged in a plane in a matrix, the movable drive electrode portion is connected to a signal line, and the fixed drive electrode is connected to a scanning line. The movable film type display device according to claim 1 or 2. Pixels having the fixed portion, the movable film, and the fixed drive electrode are arranged in a plane in a matrix, the movable drive electrode portion is connected to a first scanning line, and the first fixed drive electrode is connected to a signal line. The movable film type display device according to claim 2, wherein the second fixed driving electrode is connected to the second scanning line. A plurality of first color fixing portions each having a pixel region on the surface;
A plurality of movable films made of electrets, each having a second color display section, a movable drive electrode section, and a bending section that freely bends the display section and the movable drive electrode section;
A plurality of fixed drive electrodes disposed to face the movable drive electrode portion;
Drive means for providing a potential difference between the movable drive electrode portion and the fixed drive electrode ;
A substrate to which an end of the movable drive electrode portion is fixed ,
The movable drive electrode portion is arranged perpendicular to the fixed portion and can be bent toward the fixed drive electrode side,
The bending of the movable drive electrode portion uses an electrostatic force due to a potential difference between the movable drive electrode portion and the fixed drive electrode ,
The display unit is disposed so as to pass through a gap formed between the fixed parts adjacent to each other, and is exposed to the surface of the fixed part by bending of the movable drive electrode part and the adjacent fixed part. A movable film type display device characterized in that it can be hidden on the back surface. A plurality of first color fixing portions each having a pixel region on the surface;
A plurality of movable films having a second color display portion, a movable drive electrode portion made of a bimorph piezoelectric film, and a bent portion that freely bends the display portion and the movable drive electrode portion;
Drive means for applying a potential difference to the movable drive electrode portion;
A substrate to which an end of the movable drive electrode portion is fixed ,
The movable drive electrode part is arranged perpendicular to the fixed part and can be bent,
The bending of the movable drive electrode part uses a bending force due to a potential difference applied to the movable drive electrode part,
The display unit is disposed so as to pass through a gap formed between the fixed parts adjacent to each other, and is exposed to the surface of the fixed part by bending of the movable drive electrode part and the adjacent fixed part. A movable film type display device characterized in that it can be hidden on the back surface.

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