JP2017049408A - Electrophoretic display device and electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrophoretic display device and the like in which display qualities can be improved.SOLUTION: The electrophoretic display device has a display unit including a first substrate and a second substrate disposed opposing to each other, a dispersion liquid disposed between the first substrate and the second substrate, a third substrate on which a light source is mounted, and a light guide body disposed on the second substrate side and guiding light from the light source. The electrophoretic display device also includes: a partition wall and a movement suppressing part for suppressing movement of the dispersion liquid, between the first substrate and the second substrate; and a first member having light-shielding property disposed between the second substrate and the light guide body and in a direction of stacking the substrate and the light guide body.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an electrophoretic display device and an electronic apparatus.

An electrophoretic display device (EPD: Electrophoretic Display) is used in, for example, electronic paper (see Patent Document 1).
An electrophoretic display device separates particles having different colors and reflectivities by applying a voltage to a solvent into which particles having chargeability and dispersibility are injected and moving the particles to a predetermined electrode side. The contents of the display can be changed. As an example, in a monochrome display using particles corresponding to white (referred to as “white particles”) and particles corresponding to black (referred to as “black particles”), in general, white light is scattered using white light scattering. Is displayed and black is displayed by utilizing the light absorptivity of the black particles.
The electrophoretic display device is configured as, for example, a reflective display device that can obtain display contrast by reflecting external light. In this case, the electrophoretic display device has a light source plate such as a front light that illuminates a display surface and a laminated light guide plate, assuming that the electrophoretic display device is used in a dark place such as at night. The same applies to commercially available electrophoretic display devices.

Japanese Patent Laying-Open No. 2015-18060

  In an electrophoretic display device configured as a reflective display device using a front light, generally, a light guide plate is disposed on the display surface so that light is uniformly applied to the display surface, and the side surface of the light guide plate is arranged. The light from the light source enters the light guide plate. In the electrophoretic display device, for example, in order to suppress (for example, prevent) the movement of the dispersion liquid (dispersion medium, particles) between spaces (cells) partitioned by the partition walls, the display surface side In addition, it is necessary to provide a structure in which a bonding layer is provided and a partition wall is bitten into the bonding layer. However, in such a biting structure, the bonding layer is deformed, and the light when the front light is turned on is reflected (or refracted) by the deformed portion of the bonding layer, and the streaky emission line on the display surface May occur, resulting in poor appearance.

Furthermore, the streak-like bright line increases the reflectivity in black display, and the contrast may be significantly reduced.
There are the following three paths (path 1) to (path 3) as the path (optical path) of the light beam causing such a cause. Among these, (path 1) is a path of light rays having a great influence on the streaky emission line.
(Path 1) A path of side incident light due to leakage light from a light emitting diode (LED).
(Path 2) A path of leakage light from the light guide plate (that is, light that does not pass through the light guide pattern of the light guide plate).
(Route 3) A route of incident light (that is, light passing through the light guide pattern of the light guide plate) by the light guide pattern of the light guide plate.
In addition, it is not limited to the case where such streak-like bright lines are generated, and it is conceivable that the display quality deteriorates due to leakage of light when the front light is turned on.

  SUMMARY An advantage of some aspects of the invention is that it provides an electrophoretic display device and an electronic apparatus capable of improving display quality.

In order to solve at least one of the above-described problems, one embodiment of the present invention includes a first substrate and a second substrate which are disposed to face each other, and between the first substrate and the second substrate. A display unit comprising: a dispersion liquid disposed on the second substrate; a third substrate on which the light source is mounted; and a light guide disposed on the second substrate side to guide light from the light source. A partition between the first substrate and the second substrate, and a movement suppressing unit that suppresses the movement of the dispersion liquid, and the second substrate and the light guide This is an electrophoretic display device in which a first member having a light-shielding property is disposed between and in the stacking direction.
With this configuration, in the electrophoretic display device, the first member having a light shielding property is disposed between the second substrate and the light guide and in the stacking direction thereof. Thereby, in the electrophoretic display device, the display quality can be improved by shielding light from the first member.

According to one embodiment of the present invention, in the electrophoretic display device, the first member may be a part of the third substrate.
With this configuration, in the electrophoretic display device, the first member is a part of the third substrate. Accordingly, in the electrophoretic display device, by using a part of the third substrate, it is not necessary to add the first member separately, and the number of parts can be reduced.

One embodiment of the present invention may employ a configuration in which an adhesive portion is disposed between the second substrate and the light guide in the stacking direction in the electrophoretic display device.
With this configuration, in the electrophoretic display device, the adhesive portion is disposed between the second substrate and the light guide in the stacking direction. Thereby, in the electrophoretic display device, the second substrate and the light guide can be fixed by the adhesive portion.

According to one embodiment of the present invention, in the electrophoretic display device, the third substrate may include a region having a light-blocking property with respect to light from the light source.
With this configuration, in the electrophoretic display device, the third substrate is provided with a region having a light shielding property with respect to light from the light source. Thereby, in the electrophoretic display device, the light from the light source can be blocked by the region, and the display quality can be improved.

In one embodiment of the present invention, in the electrophoretic display device, a structure in which the light-blocking region is a wiring region may be used.
With this configuration, in the electrophoretic display device, the light-shielding region is a wiring region. Thus, in the electrophoretic display device, by forming the light-shielding region using the wiring region, it is possible to prevent an increase in the number of steps for forming the region.

In one embodiment of the present invention, in the electrophoretic display device, a configuration in which a light-shielding second member is disposed on at least a part of the outer periphery of the display portion may be used.
With this configuration, in the electrophoretic display device, the second member having light shielding properties is disposed on at least a part of the outer periphery of the display unit. Thus, in the electrophoretic display device, the display quality can be improved by shielding light from the second member.

According to one embodiment of the present invention, in the electrophoretic display device, a configuration in which the movement suppressing unit is provided on a side of the second substrate may be used.
With this configuration, in the electrophoretic display device, the movement suppression unit is provided on the second substrate side. Thereby, in the electrophoretic display device, for example, streaky bright lines generated in the movement suppressing unit can be suppressed, and the display quality can be improved.

In order to solve at least one of the above problems, one embodiment of the present invention is an electronic device including the electrophoretic display device.
With this configuration, the electronic apparatus includes the electrophoretic display device. Thereby, in the electronic device, the display quality can be improved.

  As described above, according to the electrophoretic display device and the electronic apparatus according to the present invention, the first member having the light shielding property is disposed between the second substrate and the light guide in the stacking direction. Has been. Thereby, in the electrophoretic display device and the electronic apparatus according to the present invention, the display quality can be improved by shielding the light with the first member.

1 is a diagram illustrating a schematic configuration example of an electrophoretic display device according to an embodiment of the present invention. It is a figure which shows the structural example of the display part of the electrophoretic display device which concerns on one Embodiment (1st Embodiment) of this invention. It is a figure which shows the structural example of the wiring board which concerns on one Embodiment (2nd Embodiment) of this invention. It is a figure which shows the structural example of the wiring board which concerns on one Embodiment (3rd Embodiment) of this invention. It is a figure which shows the structural example of the display part of the electrophoretic display device which concerns on one Embodiment (4th Embodiment) of this invention. It is a figure which shows the structural example of the display part of the electrophoretic display device which concerns on another structural example. It is a figure which shows the schematic structural example of the electrophoretic display device which concerns on one Embodiment (5th Embodiment) of this invention. (A)-(C) are figures which show the schematic structural example of the electronic device which concerns on embodiment (6th Embodiment) of this invention. It is a figure which shows the example of a structure of the display part which concerns on background art, and the path | route of the light ray which produces a stripe-like bright line. It is a figure which shows the light ray used as the streaky emission line which concerns on background art.

  Embodiments of the present invention will be described in detail with reference to the drawings.

[Description of pixel configuration and streaky emission line according to background art]
First, with reference to FIG. 9 and FIG. 10, a configuration of pixels of a display unit and streaky bright lines according to the background art will be described.
FIG. 9 is a diagram illustrating a configuration example of the display unit 2001 according to the background art and a path of light rays that generate streak-like bright lines. FIG. 9 is a cross-sectional side view of the display unit 2001, and shows a part related to a part of the pixel region located on the outer peripheral side surface.
The display portion 2001 includes a first substrate (referred to as “driving substrate”) 2101 and a second substrate (referred to as “counter substrate”) 2102 facing each other. The display portion 2001 includes a sealing portion 2103 on the outer peripheral side surfaces of the drive substrate 2101 and the counter substrate 2102.
The display portion 2001 includes a bonding layer 2104 between the driving substrate 2101 and the counter substrate 2102 and on the counter substrate 2102 side.
The display portion 2001 includes a partition 2105 that partitions each pixel region between the drive substrate 2101 and the bonding layer 2104. A plurality of partition walls 2105 are provided, whereby a space (cell) for each pixel region is formed.
The display portion 2001 includes a dispersion liquid 2106 between the driving substrate 2101 and the bonding layer 2104 for each pixel region. The dispersion liquid 2106 includes, for example, a dispersion medium, a plurality of white particles, and a plurality of black particles. The dispersion liquid 2106 is sealed by the sealing portion 2103 on the outer peripheral side surface.
Note that an electrophoretic panel is configured by the drive substrate 2101 and the counter substrate 2102 and the portion sandwiched between them.

  Here, the partition 2105 is in contact with the bonding layer 2104 and presses the bonding layer 2104. Thus, the bonding layer 2104 is deformed around the partition wall 2105 by the structure in which the partition wall 2105 is pressed against the bonding layer 2104 (a biting structure).

The drive substrate 2101 includes an electrode (pixel electrode 2121) for each pixel region.
The counter substrate 2102 includes an electrode (common electrode 2122) common to a plurality of pixel regions.
In this configuration example, a control unit (not shown) controls the voltage applied to the pixel electrode 2121 for each pixel region, thereby performing white display or black display. Note that the voltage applied to the common electrode 2122 may be a constant voltage, or may be variably controlled by the control unit.

The display unit 2001 includes a light guide plate 2107 at a position facing the counter substrate 2102 and opposite to the drive substrate 2101. In addition, the display unit 2001 includes a transparent adhesive layer 2108 made of a transparent adhesive that fixes the counter substrate 2102 and the light guide plate 2107 between them.
The display portion 2001 includes a third substrate (referred to as a “wiring substrate”) 2109 on which an LED 2110 that is a light emitting portion is mounted. The wiring substrate 2109 is disposed at a position where light emitted from the LED 2110 is incident from the side surface of the light guide plate 2107. Note that the wiring board 2109 is formed of, for example, a flexible board.

Here, in FIG. 9, three ray paths G1 to G3 are shown.
The path G1 corresponds to (path 1) shown in the above problem, that is, a path of side incident light due to leakage light from the LED 2110.
The path G2 corresponds to (path 2) shown in the above problem, that is, a path of leakage light from the light guide plate 2107 (that is, light that does not pass through the light guide pattern of the light guide plate 2107).
The path G3 corresponds to (path 3) shown in the above problem, that is, a path of incident light by the light guide pattern of the light guide plate 2107 (that is, light passing through the light guide pattern of the light guide plate 2107).
Among these, the influence of the path G1 is particularly great on the streak-like bright line (streak-like bright line).

FIG. 10 is a diagram showing light rays that become streaky bright lines according to the background art.
FIG. 10 shows the bonding layer 2104 and the partition 2105. In addition, FIG. 10 shows light rays that become streaky emission lines. FIG. 10 is a cross-sectional side view, showing a portion related to a part of the pixel region.

  In this configuration example, silicone oil (Si-oil) having a refractive index of 1.39 is used as a dispersion medium for the dispersion liquid 2106. As the bonding layer 2104, a layer having a refractive index of 1.52 is used. As the partition wall 2105, a cylindrical member made of a material having a refractive index of 1.62 and having a diameter of about 5 μm (a radius of about 2.5 μm) is used. When the partition 2105 is pressed against one surface of the bonding layer 2104 (the surface on the partition 2105 side), the partition 2105 enters the inside of the bonding layer 2104 by about 2.5 μm from the surface of the bonding layer 2104. I'm out (bite in). The common electrode 2122 is configured using ITO (indium tin oxide) having a refractive index of 1.9. The counter substrate 2102 is formed using a glass substrate having a refractive index of 1.52.

(First embodiment)
Next, the electrophoretic display device according to this embodiment will be described.
FIG. 1 is a diagram showing a schematic configuration example of an electrophoretic display device 1 according to an embodiment of the present invention. FIG. 1 is a plan view of the electrophoretic display device 1.
The electrophoretic display device 1 includes a display unit 11 and a control unit 12.
The display unit 11 includes a plurality of pixel regions 21 arranged vertically and horizontally (matrix).
The control unit 12 controls the color to be displayed by controlling the voltage applied to the dispersion for each pixel region 21. In this embodiment, each pixel region 21 has a dispersion liquid containing white particles and black particles together with a dispersion medium, and white display using white particles or black display using black particles is possible. It is.

FIG. 2 is a diagram showing a configuration example of the display unit 11 of the electrophoretic display device 1 according to one embodiment (first embodiment) of the present invention. FIG. 2 is a cross-sectional side view of the display unit 11 and shows a part related to a part of the pixel region 21 located on the outer peripheral side surface.
In the present embodiment, the configuration of two or more pixel regions 21 that do not face the outer periphery of the plurality of pixel regions 21 is the same, and the configuration of two or more pixel regions 21 that face the outer periphery is the same. Moreover, these are the same structures except the different part according to whether it faces an outer periphery.

  The display unit 11 includes a first substrate (drive substrate 31) having an electrode (pixel electrode 41) for each pixel region 21 and a second substrate (electrode common electrode 42) common to the plurality of pixel regions 21 ( Counter substrate 32), sealing portion 33 on the outer peripheral side surface, dispersion liquid 34 having a dispersion medium, a plurality of white particles, and a plurality of black particles, a bonding layer (not shown), and a plurality of partition walls (not shown) ), A light guide plate 35, a transparent adhesive layer 36, a third substrate (wiring substrate 37) composed of, for example, a flexible substrate, and an LED 38 provided on the wiring substrate 37.

Here, the light guide plate 35 is an example of a light guide unit that guides light emitted from the LEDs 38. For example, a member having a shape other than a plate may be used as the light guide unit.
In addition, the adhesive layer (in this embodiment, the transparent adhesive layer 36) is an example of an adhesive portion including an adhesive for adhering and fixing the counter substrate 32 and the light guide plate 35. For example, a member having a shape other than the layer may be used as the bonding portion.
The bonding layer is an example of a movement suppressing unit that suppresses the movement of the dispersion liquid 34. For example, a member having a shape other than a layer may be used as the movement suppressing unit.
The LED 38 is an example of a light source (light emitting unit) that emits light. As the said light source, things other than LED may be used.

Here, the configuration of the display unit 11 according to the present embodiment is different from the configuration shown in FIG. 9 in that the configuration related to the wiring board 37 provided with the light guide plate 35, the transparent adhesive layer 36, and the LED 38 is different from the configuration shown in FIG. The configuration is the same as that shown in FIG.
For this reason, below, the point which is different from the structure shown by FIG. 9 about the structure of the display part 11 which concerns on this embodiment is demonstrated in detail.

FIG. 2 shows the position 51 of the outer peripheral end face of the transparent adhesive layer 36, the position 52 of the outer peripheral end face of the light guide plate 35, and the inward direction 53.
In the present embodiment, the outer peripheral end surface of the transparent adhesive layer 36 is located on the inner side (the side other than the outer peripheral side) with respect to the outer peripheral end surfaces of the drive substrate 31, the counter substrate 32, the sealing portion 33 and the light guide plate 35. Are arranged as follows. In the example of the configuration shown in FIG. 9, the outer peripheral end surfaces of the counter substrate 2102, the sealing portion 2103, and the transparent adhesive layer 2108 are aligned.

  In the present embodiment, the wiring substrate 37 is disposed so that one end surface thereof is in contact with or substantially in contact with the outer peripheral end surface of the transparent adhesive layer 36. Actually, since the wiring board 37 and the transparent adhesive layer 36 are different from each other, for example, the wiring board 37 and the transparent adhesive layer 36 are arranged close to each other but separated from each other. In the present embodiment, one surface of the wiring substrate 37 (the surface on which the LEDs 38 are provided) is in contact with and bonded to one surface of the light guide plate 35 (the surface on the counter substrate 32 side). Thereby, a part of the wiring board 37 is disposed between the counter substrate 32 and the light guide plate 35 in the stacking direction. In the present embodiment, a part of the wiring substrate 37 is disposed in a recess (concave portion) formed by the counter substrate 32, the light guide plate 35, and the transparent adhesive layer 36. A part of the wiring board 37 is a part in the direction in which the light of the LED 38 is emitted, and is a part extending in the direction from the position where the LED 38 is disposed. In the present embodiment, as an example, it can be considered that the area of the wiring board 37 for performing lighting using the LED 38 is increased by a part of the wiring board 37.

  In this embodiment, in the cross section shown in FIG. 2, the outer peripheral end surface of the transparent adhesive layer 36, one end surface of the wiring substrate 37, and the outer periphery of the counter substrate 32 in the direction from the inner side to the outer side of the plane of the electrophoresis panel. It arrange | positions so that it may become the order of an end surface (in this embodiment, the end surface of the outer periphery of the sealing part 33 is the same), and the light emission surface of LED38.

  As described above, in the display unit 11 of the electrophoretic display device 1 according to the present embodiment, the end surface of the transparent adhesive layer 36 disposed between the counter substrate 32 and the light guide plate 35 is positioned relatively inside. A part of the wiring substrate 37 is disposed between the counter substrate 32 and the light guide plate 35 in the stacking direction. Thereby, in the display unit 11 of the electrophoretic display device 1 according to the present embodiment, the light emitted from the LED 38 is shielded by a part of the wiring substrate 37, and the light is transmitted to the end surface of the electrophoretic panel (the end surface of the drive substrate 31). , Can be suppressed (for example, prevented) from entering from the end surface of the counter substrate 32 and the end surface of the sealing portion 33, and the generation of streak-like bright lines shown in FIGS. 9 and 10 can be suppressed (for example, prevented). can do.

Thus, in the display unit 11 of the electrophoretic display device 1 according to the present embodiment, the light from the light source of the front light (LED 38 in the present embodiment) is transmitted to the cell by shielding the outer peripheral side surface of the cell. Suppressing (for example, preventing) incident on the side surface. Thereby, when the light source of the front light is turned on, streak-like bright lines generated due to the biting structure between the partition walls and the bonding layer can be reduced, and a decrease in reflection characteristics in black display (for example, The brightness contrast performance can be improved.
Further, in the display unit 11 of the electrophoretic display device 1 according to the present embodiment, the sealing unit 33 disposed around the outer periphery may be configured using a light-shielding material. The light shielding property can be improved at the outer peripheral end face of the portion 33.
Further, the display unit 11 of the electrophoretic display device 1 according to the present embodiment is not limited to the case where a streak-like bright line is generated. For example, by providing a light-shielding member, leakage of light from the LED 38, etc. By suppressing the influence of the display quality, it is possible to improve the display quality. As an example, in the display unit 11, by providing a light-shielding member, the intensity of light emitted from the light guide plate 35 is increased (lightened) by suppressing leakage of light from the LED 38. And display quality can be improved.

Therefore, in the electrophoretic display device 1 according to this embodiment, the display quality of the display unit 11 can be improved.
Further, in the electrophoretic display device 1 according to the present embodiment, the arrangement of the wiring board 37 is devised. For example, there is no addition of new components, the number of components can be reduced, and the cost is increased. There are few.

[Other configuration examples]
In the example of FIG. 2, a configuration in which a part of the wiring substrate 37 is disposed between the counter substrate 32 and the light guide plate 35 in the stacking direction is shown. As another configuration example, the wiring substrate 37 is provided. Other members may be disposed between the counter substrate 32 and the light guide plate 35 in the stacking direction instead of a part of the counter substrate 32.
As the other member, for example, various members having a light shielding property may be used. As the other member, for example, a sheet-like member may be used, a tape-like member may be used, and when the display unit 11 is viewed in the direction from the light guide plate 35 to the counter substrate 32. A ring-shaped member that makes one round of the outer periphery may be used, or in accordance with the shape of the outer peripheral end surfaces of the sealing portion 33, the counter substrate 32, and the transparent adhesive layer 36 in the cross section shown in FIG. 2. A member having a shape (for example, an L-shaped shape) may be used.
Even in such a configuration, it is possible to suppress (for example, prevent) light from the light source of the front light (in this embodiment, the LED 38) from entering the side surface of the cell, and to improve the display quality of the display unit 11. Can be improved.

[Configuration example of display unit]
Here, a configuration example of the display unit 11 will be described.
The drive substrate 31 is a substrate made of, for example, glass or plastic.
The counter substrate 32 is a side that displays an image, and is a light-transmitting substrate such as glass. For the common electrode 42 formed on the counter substrate 32, a material having translucency and conductivity is used. For example, ITO (indium tin oxide), MgAg (magnesium silver), IZO (indium zinc oxide). ) Etc. are used.
In the present embodiment, the common electrode 42 common to the plurality of pixel regions 21 is provided, but a plurality of divided electrodes may be used instead of the common electrode 42. These plurality of electrodes may be provided for each pixel, for example.

  Examples of the dispersion medium include alcohol solvents such as water, methanol, ethanol, isopropanol, butanol, octanol, and methyl cellosolve, various esters such as ethyl acetate and butyl acetate, and ketones such as acetone, methyl ethyl ketone, and methyl isobutyl ketone. , Aliphatic hydrocarbons such as pentane, hexane and octane, alicyclic hydrocarbons such as cyclohexane and methylcyclohexane, benzene, toluene, xylene, hexylbenzene, hebutylbenzene, octylbenzene, nonylbenzene, decylbenzene , Aromatic hydrocarbons such as benzenes having a long chain alkyl group such as undecylbenzene, dodecylbenzene, tridecylbenzene, tetradecylbenzene, etc., halo such as methylene chloride, chloroform, carbon tetrachloride, 1,2-dichloroethane, etc. Emissions of hydrocarbons, may be mentioned those obtained by blending a surfactant or the like alone or a mixture thereof, such as carboxylates or other various oils.

The white particles are particles (polymer or colloid) made of a white pigment such as titanium dioxide, zinc white, and antimony trioxide, and are negatively charged, for example.
The black particles are particles (polymer or colloid) made of a black pigment such as aniline black or carbon black, and are positively charged, for example.
With this configuration, the white particles and the black particles move in the electric field generated by the potential difference between the pixel electrode 41 and the common electrode 42 in the dispersion medium.
In addition, for white pigments or black pigments, if necessary, charge control agents composed of particles of electrolytes, surfactants, metal soaps, resins, rubbers, oils, varnishes, compounds, etc., titanium-based coupling agents, aluminum-based pigments A dispersing agent such as a coupling agent and a silane coupling agent, a lubricant, a stabilizer, and the like may be added.

  For example, a voltage is applied between the pixel electrode 41 and the common electrode 42 so that the voltage of the common electrode 42 is relatively high. Then, the positively charged black particles are attracted toward the pixel electrode 41 by the Coulomb force. On the other hand, the negatively charged white particles are attracted toward the common electrode 42 by the Coulomb force. As a result, white particles gather on the display surface side (common electrode 42 side), and a color (white) corresponding to the white particles is displayed on the display surface.

  Conversely, a voltage is applied between the pixel electrode 41 and the common electrode 42 so that the potential of the pixel electrode 41 is relatively high. Then, the negatively charged white particles are attracted toward the pixel electrode 41 by the Coulomb force. On the other hand, the positively charged black particles are attracted toward the common electrode 42 by the Coulomb force. As a result, black particles gather on the display surface side (common electrode 42 side), and a color (black) corresponding to the black particles is displayed on the display surface.

  In addition, the electrophoretic display device 1 including the display unit 11 that displays red, green, blue, and the like by changing the pigment used for the white particles and the black particles to pigments such as red, green, and blue, for example. Is possible. Note that the display color of each pixel may be arbitrary. In this embodiment, two particles of white particles and black particles are used. However, as another configuration example, one (only) particles may be used, or three particles having different colors from each other. The above particles may be used.

  In addition, in this embodiment, a square shape (for example, a shape in which squares are arranged) is used as a shape in which spaces (closed spaces serving as cells) for each pixel region 21 formed by a plurality of partition walls are arranged. However, as another configuration example, other shapes such as a honeycomb shape (a shape in which regular hexagonal columns are arranged) may be used.

(Second Embodiment)
FIG. 3 is a diagram showing a configuration example of a wiring board 37a according to an embodiment (second embodiment) of the present invention.
FIG. 3 shows a state in which the wiring board 37 (shown as the wiring board 37a in FIG. 3) and the LED 38 shown in FIG. 2 are viewed in the direction from the light guide plate 35 to the counter substrate 32.

In the present embodiment, a configuration different from that of the first embodiment will be described in detail. The same components as those in the first embodiment are denoted by the same reference numerals.
In the wiring board 37a according to the present embodiment, a light shielding film 101 is provided on the surface on which the LEDs 38 and 39 are mounted from the vicinity of the end face where the light of the LEDs 38 and 39 is emitted in the direction in which the light travels. ing. In the present embodiment, the light shielding film 101 is provided in the entire region from the vicinity of the end faces of the LEDs 38 and 39 to the end face of the wiring board 37a in the direction in which the light travels. 3 shows an example in which a small gap is provided between the end faces of the LEDs 38 and 39 and the light shielding film 101, the end faces of the LEDs 38 and 39 and the light shielding film 101 may be in contact with each other. .
Here, the material of the light shielding film 101 may be arbitrary, and for example, a black paint or a black glass epoxy (glass epoxy) material may be used.

As described above, in the display unit of the electrophoretic display device according to the present embodiment, the light-shielding film 101 is provided in a region where the light from the LEDs 38 and 39 can travel on the surface of the wiring board 37a on which the LEDs 38 and 39 are provided. Is provided.
As another configuration example, instead of the surface on which the LEDs 38 and 39 of the wiring board 37a are provided, the surface of the wiring board 37a on which the LEDs 38 and 39 are not provided is opposed to the light shielding film 101 shown in FIG. A configuration in which a light shielding film is provided at the same position on the opposite surface) may be used.
As another configuration example, a configuration in which a light shielding film is provided on both the surface on which the LEDs 38 and 39 of the wiring board 37a are provided and the surface on which the LEDs are not provided may be used.
Further, for example, the light shielding film may be provided in a region narrower than or wider than the light shielding film 101 in the present embodiment.

  With such a configuration, in the display unit of the electrophoretic display device according to the present embodiment, for example, the light shielding property can be improved by the light shielding film 101 together with the material of the wiring substrate 37a. Thereby, for example, even when the light shielding property is not sufficient only by the material of the wiring board 37a, the light shielding film 101 can sufficiently secure the light shielding property.

(Third embodiment)
FIG. 4 is a diagram showing a configuration example of a wiring board 37b according to an embodiment (third embodiment) of the present invention.
FIG. 4 shows a state in which the wiring board 37 (shown as the wiring board 37b in FIG. 4) and the LED 38 shown in FIG. 2 are viewed in the direction from the light guide plate 35 to the counter substrate 32.

In the present embodiment, a configuration different from that of the first embodiment will be described in detail. The same components as those in the first embodiment are denoted by the same reference numerals.
In the wiring board 37b according to the present embodiment, wiring (solid wiring) 121 is provided on the surface on which the LEDs 38 and 39 are mounted from the vicinity of the end surface where the light from the LEDs 38 and 39 is emitted in the direction in which the light travels. Is provided. In the present embodiment, the wiring 121 is provided in the entire region from the vicinity of the end faces of the LEDs 38 and 39 to the vicinity of the end face of the wiring board 37b in the direction in which the light travels. 4 shows an example in which a small gap is provided between the end faces of the LEDs 38 and 39 and the wiring 121, the end faces of the LEDs 38 and 39 and the wiring 121 may be in contact with each other. 4 shows an example in which a small gap is provided between the end face of the wiring board 37b and the wiring 121, the end face of the wiring board 37b and the wiring 121 may be in contact with each other.

  In the present embodiment, as the wiring 121, a wiring common to the copper foil wiring originally provided is used. In other words, as an example, it is possible to expand the area of the copper foil wiring originally provided, and to grasp that the area of the wiring 121 according to the present embodiment is formed by the expanded copper foil wiring area. It is. In addition, as a metal of the wiring 121, metals other than copper foil may be used as another structural example.

As described above, in the display unit of the electrophoretic display device according to this embodiment, the wiring 121 is provided in a region where the light from the LEDs 38 and 39 can travel on the surface of the wiring board 37b on which the LEDs 38 and 39 are provided. It has been.
As another configuration example, instead of the surface on which the LEDs 38 and 39 of the wiring board 37b are provided, the position facing the wiring 121 shown in FIG. A configuration may be used in which wiring is provided at the same position on the surface.
Further, as another configuration example, a configuration in which wiring is provided on both the surface where the LEDs 38 and 39 of the wiring board 37b are provided and the surface where the LEDs 38 and 39 are not provided may be used.
Further, for example, the wiring may be provided in a region narrower or wider than the wiring 121 in the present embodiment.

With such a configuration, in the display unit of the electrophoretic display device according to the present embodiment, for example, the overall light shielding property can be improved by the light shielding property of the wiring 121 together with the material of the wiring substrate 37b. Thereby, for example, even when the light shielding property is not sufficient only by the material of the wiring substrate 37b, the wiring 121 can sufficiently secure the light shielding property.
Moreover, in the display unit of the electrophoretic display device according to the present embodiment, for example, the wiring 121 can be formed together in the same process as the process of forming the originally provided copper foil wiring. , Increase in the number of steps can be prevented.

Here, in the present embodiment, as an example, the printed layer of the wiring 121 may be formed using a silk printing technique. The thickness of the print layer may be 10 μm, for example.
As another configuration example, the printed layer may be formed using a material other than metal instead of metal. As the material, for example, a light-shielding material is used.
The color of the print layer may be black, for example.

(Fourth embodiment)
FIG. 5 is a diagram illustrating a configuration example of the display unit 201 of the electrophoretic display device according to one embodiment (fourth embodiment) of the present invention. FIG. 5 is a cross-sectional side view of the display unit 201 and shows a part related to a part of the pixel region 21 located on the outer peripheral side surface.
In the present embodiment, a configuration different from that of the first embodiment will be described in detail. The same components as those in the first embodiment are denoted by the same reference numerals.
The display unit 201 according to the present embodiment includes a light shielding unit 141 on the outer peripheral end surfaces of the counter substrate 32, the sealing unit 33, and the transparent adhesive layer 36.
Here, the light shielding part 141 is configured using a material having a light shielding property, and is composed of, for example, a resin having a light shielding property. For example, a carbon-based mixed resin may be applied as the resin. Further, a light shielding tape or the like may be used as the light shielding unit 141.

As described above, in the display unit 201 of the electrophoretic display device according to the present embodiment, the end surface (only the end surface in the present embodiment) on the side irradiated with the light of the LED 38 (the counter substrate 32, the sealing unit 33). , And a portion of the outer peripheral end surface of the transparent adhesive layer 36).
Further, as another configuration example, a configuration in which a light shielding portion is provided on a part of the outer peripheral end surface of the counter substrate 32, the sealing portion 33, and the transparent adhesive layer 36 may be used.
With such a configuration, in the display unit 201 of the electrophoretic display device according to the present embodiment, for example, the overall light shielding property can be improved by the light shielding property of the light shielding unit 141.

[Other configuration examples]
FIG. 6 is a diagram illustrating a configuration example of a display unit 1001 of an electrophoretic display device according to another configuration example. FIG. 6 is a cross-sectional side view of the display unit 1001 and shows a portion related to a part of the pixel region located on the outer peripheral side surface.
The display portion 1001 includes a first substrate (drive substrate 1101) having an electrode (pixel electrode 1201) for each pixel region and a second substrate (counter substrate) having an electrode (common electrode 1202) common to the plurality of pixel regions. 1102), a sealing portion 1103 on the outer peripheral side surface, a dispersion medium 1104 having a dispersion medium, a plurality of white particles, and a plurality of black particles, a bonding layer (not shown), and a plurality of partition walls (not shown) , A light guide plate 1105, a transparent adhesive layer 1106, a third substrate (wiring substrate 1107) composed of, for example, a flexible substrate, and an LED 1108 provided on the wiring substrate 1107.
The display unit 1001 according to this configuration example has the same configuration as the display unit 2001 shown in FIG. 9, that is, the configuration in which the outer peripheral end surfaces of the counter substrate 1102, the sealing unit 1103, and the transparent adhesive layer 1106 are aligned. The light shielding portion 1121 is provided on a portion of the end surface of the LED 1108 on which light is irradiated (in the present configuration example, only the end surface) (on the peripheral surface of the counter substrate 1102, the sealing portion 1103, and the transparent adhesive layer 1106). Is provided. The light shielding part 1121 is made of a material having a light shielding property, and is made of, for example, a resin having a light shielding property.
Further, as another configuration example, a configuration in which a light-shielding portion is provided on a part of the outer peripheral end surface of the counter substrate 1102, the sealing portion 1103, and the transparent adhesive layer 1106 may be used.
With such a configuration, for example, the overall light shielding performance can be improved by the light shielding performance of the light shielding section 1121.

(Fifth embodiment)
FIG. 7 is a diagram illustrating a schematic configuration example of an electrophoretic display device 211 according to an embodiment (fifth embodiment) of the present invention. FIG. 7 is a cross-sectional side view of the electrophoretic display device 211.
The electrophoretic display device 211 includes a frame 221, a display unit 222, and a control unit (not shown).
The display unit 222 includes a first substrate (drive substrate 231) having a pixel electrode (not shown) for each pixel region 21 and a second electrode having a common electrode (not shown) common to the plurality of pixel regions 21. Substrate (counter substrate 232), sealing portions 233, 234 on the outer peripheral side surface, dispersion medium 235 having a dispersion medium, a plurality of white particles, and a plurality of black particles, a bonding layer (not shown), and a plurality of partition walls (Not shown), a light guide plate 236, a third substrate (wiring substrate 237) composed of, for example, a flexible substrate, and an LED 238 provided on the wiring substrate 237.

  Here, the configuration of the electrophoretic display device 211 according to this embodiment is a configuration in which the light guide plate 236 is supported using the frame 221 instead of the adhesive (in the example of FIG. 2, the transparent adhesive 36). The configuration shown in FIG. 2 is the same as that shown in FIG.

In the present embodiment, the frame 221 has a cylindrical shape. The frame 221 has at least two protrusions on the upper side of the inside of the cylinder. The protrusion is, for example, parallel to the bottom surface of the cylinder. The shape of the frame 221 may be other shapes, for example, a shape such as a quadrangular prism having a cavity inside. The frame 221 may be configured using, for example, a plastic.
In the present embodiment, a laminated structure portion from the drive substrate 231 to the counter substrate 232 is provided on the inner bottom surface of the cylinder of the frame 221. In addition, a light guide plate 236 is provided on the surface (surface opposite to the bottom surface) of at least two protrusions of the frame 221.

As described above, the electrophoretic display device 211 according to this embodiment has a structure in which the light guide plate 236 supported by the frame 221 floats above the counter substrate 232. In the present embodiment, air exists between the counter substrate 232 and the light guide plate 236.
As described above, as a configuration in which the counter substrate 232 and the light guide plate 236 are arranged in the stacking direction, the frame 221 can be used instead of the adhesive.

In the display unit 222 of the electrophoretic display device 211 according to the present embodiment, a part of the wiring substrate 237 is disposed between the counter substrate 232 and the light guide plate 236 in the stacking direction. Thereby, in the display unit 222 of the electrophoretic display device 211 according to the present embodiment, the light emitted from the LED 238 is shielded by a part of the wiring substrate 237, and the light is transmitted to the end surface of the electrophoretic panel (the end surface of the drive substrate 231). , Can be suppressed (for example, prevented) from entering from the end surface of the counter substrate 232 and the end surfaces of the sealing portions 233, 234, and the generation of streak-like bright lines shown in FIGS. 9 and 10 can be suppressed (for example, Prevention).
Further, in the display unit 222 of the electrophoretic display device 211 according to the present embodiment, for example, when the protrusions of the frame 221 are made of a light-shielding material, the light from the LED 238 can be blocked by the protrusions. It is.
Therefore, in the electrophoretic display device 211 according to the present embodiment, the display quality of the display unit 222 can be improved.

  Here, in this embodiment, the frame 221 is provided with at least two protrusions, and the light guide plate 236 (and the wiring board 237) is supported by the protrusions. As another configuration example, the frame 221 may have a ring-shaped protrusion on the inner upper side, and the protrusion 236 supports the light guide plate 236 (and the wiring board 237). Also good. Note that in the case where the wiring board 237 can be considered to be very thin compared to the light guide plate 236, even if a part of the surface of the wiring board 237 overlaps with a part of the surface of the light guide plate 236, the light guide plate 236. It can be considered that the thickness of only the part and the thickness of the portion where the wiring board 237 overlaps are substantially the same.

(Modification)
In the above embodiments (the first to fifth embodiments), the partition wall is provided on the drive substrate 31 side and the bonding layer is provided on the counter substrate 32 side. Alternatively, a configuration in which the partition wall is provided on the counter substrate 32 side and the bonding layer is provided on the drive substrate 31 side (herein referred to as the configuration of Modification 1) may be used.
Even in the configuration of Modification 1 as described above, the present invention is not limited to the case where streaky bright lines are generated. For example, by providing a light-shielding member, light leakage from the LED 38 is prevented. It is possible to improve the display quality by suppressing the influence of the above. As an example, in the display unit 11, by providing a light-shielding member, the intensity of light emitted from the light guide plate 35 is increased (lightened) by suppressing leakage of light from the LED 38. And display quality can be improved. In the configuration of the first modification example, since the deformed portion of the bonding layer is not on the display side, it is considered that the influence of the streaky bright line described in FIGS. 6 and 7 is small (or absent). It is done.
In this way, the display quality can be improved without being limited to the case where streaky bright lines are generated.

(Sixth embodiment)
FIG. 8A to FIG. 8C are diagrams showing schematic configuration examples of the electronic apparatus according to the embodiment (sixth embodiment) of the present invention. In this embodiment, a specific example of an electronic apparatus to which the electrophoretic display device according to the above embodiment is applied is shown.

FIG. 8A is a perspective view illustrating an electronic book 501 which is an example of an electronic device.
The electronic book 501 includes a book-shaped frame 511, a display unit 512 to which the electrophoretic display device according to the above embodiments is applied, and an operation unit 513.
FIG. 8B is a perspective view illustrating a wrist watch 551 which is an example of an electronic device.
The wristwatch 551 includes a display unit 561 to which the electrophoretic display device according to the above embodiment is applied.
FIG. 8C is a perspective view illustrating an electronic paper 571 that is an example of an electronic apparatus.
The electronic paper 571 includes a main body portion 581 formed of a rewritable sheet having the same texture and flexibility as paper, and a display portion 582 to which the electrophoretic display device according to the above embodiments is applied.
The electrophoretic display device according to the above embodiments may be applied to other various electronic devices, for example, display units for electronic devices such as mobile phones and portable audio devices, and business sheets such as manuals. It may be applied to textbooks, problem collections, information sheets, and the like.
Each electronic device includes, for example, a control unit, and the display unit is controlled by the control unit.

  As described above, the electronic device according to the present embodiment can obtain the same effects as those of the electrophoretic display device according to the above embodiments.

(Summary of the above embodiments)
As one configuration example, an electrophoretic display device includes a first substrate (a driving substrate in the above embodiments) and a second substrate (a counter substrate in the above embodiments) disposed opposite to each other, A dispersion liquid disposed between the first substrate and the second substrate, a third substrate on which the light source (in the above embodiment, LED) is mounted (in the above embodiment, a wiring substrate), And a light guide (in the above embodiment, a light guide plate) that is disposed on the second substrate side and guides light from the light source. Between the first substrate and the second substrate, a partition and a movement suppressing unit (in the above embodiment, a bonding layer) that suppresses the movement of the dispersion liquid are provided. In the stacking direction between the second substrate and the light guide (in the above embodiment, at least a part of the space sandwiched between the surface of the second substrate and the surface of the light guide), A first member having light shielding properties (in the above embodiment, a part of the wiring board or another member) is disposed.
As an example of the configuration, in the electrophoretic display device, the first member is a part of the third substrate.
As an example of the configuration, in the electrophoretic display device, an adhesive portion (in the above embodiments, a transparent adhesive layer) is disposed between the second substrate and the light guide in the stacking direction.
As an example of the configuration, in the electrophoretic display device, the third substrate is provided with a region having a light blocking property with respect to light from the light source (in the above embodiment, a region of a wiring or a region of another member). As an example, in the electrophoretic display device, the region is provided on one surface or both surfaces of the third substrate.
As one configuration example, in the electrophoretic display device, the light-shielding region is a wiring region.
As an example of the configuration, in the electrophoretic display device, a second member having a light shielding property (in the above embodiments, the light shielding portion provided on the end surface of the outer periphery of the display unit) is provided on at least a part of the outer periphery of the display unit. Arranged.
As an example of the configuration, in the electrophoretic display device, the movement suppression unit is provided on the second substrate side.
As one configuration example, an electronic device (in the above embodiment, the electronic device shown in FIGS. 8A to 8C) includes the above-described electrophoretic display device.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes designs and the like that do not depart from the gist of the present invention.

In addition, a computer-readable recording medium (memory) stores a program for realizing the function of an arbitrary constituent unit (for example, a control unit) in the above-described device (for example, an electrophoretic display device or an electronic device). The program may be recorded (stored) on a medium, and the program may be read into a computer system and executed. The “computer system” here includes an operating system (OS) or hardware such as peripheral devices. “Computer-readable recording medium” means a portable disk such as a flexible disk, a magneto-optical disk, a ROM (Read Only Memory), a CD (Compact Disk) -ROM, or a hard disk built in a computer system. Refers to the device. Further, the “computer-readable recording medium” means a volatile memory (RAM: Random Access) inside a computer system that becomes a server or a client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. Memory that holds a program for a certain period of time, such as Memory).
In addition, the above program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.
Further, the above program may be for realizing a part of the functions described above. Further, the program may be a so-called difference file (difference program) that can realize the above-described functions in combination with a program already recorded in the computer system.

DESCRIPTION OF SYMBOLS 1, 211 ... Electrophoretic display device 11, 201, 222, 512, 561, 582, 1001, 2001 ... Display part, 12 ... Control part, 21 ... Pixel region, 31, 231, 1101, 2101 ... Drive board, 32 232, 1102, 2102 ... counter substrate, 33, 233, 234, 1103, 2103 ... sealing part, 34, 235, 1104, 2106 ... dispersion, 35, 236, 1105, 2107 ... light guide plate, 36, 1106, 2108: Transparent adhesive layer, 37, 37a, 37b, 237, 1107, 2109 ... Wiring substrate, 38, 39, 238, 1108, 2110 ... LED, 41, 1201, 2121 ... Pixel electrode, 42, 1202, 2122 ... Common electrode , 51, 52 ... position, 53 ... direction, 101 ... light shielding film, 121 ... wiring, 141, 1121 ... light shielding part, 221 511 ... frame, 501 ... electronic books, 513 ... operation unit, 551 ... watch, 571 ... electronic paper, 581 ... main unit, 2104 ... bonding layer, 2105 ... partition wall

Claims (8)

A first substrate and a second substrate disposed opposite to each other; a dispersion disposed between the first substrate and the second substrate; a third substrate on which a light source is mounted; A light guide that is disposed on the second substrate side and guides light from the light source,
A partition between the first substrate and the second substrate, and a movement suppressing unit that suppresses the movement of the dispersion,
A first member having a light shielding property is disposed between the second substrate and the light guide in the stacking direction.
Electrophoretic display device. The first member is a part of the third substrate.
The electrophoretic display device according to claim 1. An adhesive portion is disposed between the second substrate and the light guide in the stacking direction.
The electrophoretic display device according to claim 1. The third substrate includes a region having a light blocking property with respect to light from the light source.
The electrophoretic display device according to any one of claims 1 to 3. The region having the light shielding property is a region of wiring.
The electrophoretic display device according to claim 4. A second member having a light shielding property is disposed on at least a part of the outer periphery of the display unit;
The electrophoretic display device according to any one of claims 1 to 5. The movement suppression unit is provided on the second substrate side,
The electrophoretic display device according to claim 1.   An electronic apparatus comprising the electrophoretic display device according to any one of claims 1 to 7.