JP2007114624A - Particle movement type display device - Google Patents

Abstract

There is provided a particle movement type display device capable of forming a peripheral pixel region having a good appearance by setting a desired gradation in a display cell without applying a voltage.
A peripheral pixel region 17 in which peripheral pixels 18 are arranged in a strip shape is provided outside a display pixel region 16 in which display pixels 19 are arranged. The display cell of the display pixel 19 and the non-display cell of the peripheral pixel 18 have the same partition wall, electrode arrangement, size, etc., and can control the charged particles by the electric field in the same manner. With respect to, since the display surface is colored in the same color as the charged particles, the display gradation does not change. By uniformly controlling the electric field of the display cell of the display pixel 19 and the non-display cell of the peripheral pixel 18 and injecting charged particles, uniform injection of charged particles into the display cell is performed to every corner of the display pixel region 16. It can be carried out.
[Selection] Figure 1

Description

  The present invention relates to a particle movement type display device that performs image display by arranging a large number of display cells separated from each other by partition walls, and more specifically, a configuration of a band-shaped peripheral pixel region arranged outside a display pixel region About.

  Various particle movement type display devices have been proposed in which charged particles are enclosed in moving spaces separated from each other by partition walls, and pixel display is performed according to the state of coverage of the display surface surrounded by the partition walls with charged particles. An electrophoretic display device, which is one type of particle movement display device, does not require a polarizing plate like a liquid crystal display device, and can therefore display practical brightness as a reflective display device without a backlight. It has a memory property of pixel display in which the pixel display is retained even after the voltage application is released. As a result, it is expected to be applied to low power consumption cellular phones, portable input terminals, electronic books, game devices, and the like.

  In addition, a liquid crystal display device in which a display electrode and a thin film transistor are arranged for each display cell has been put into practical use. In many liquid crystal display devices, a band-shaped peripheral pixel region is arranged so as to surround the outside of a display pixel region in which a large number of display cells are arranged in a plane. Similar to the display pixel region, display cells provided with display electrodes and thin film transistors are arranged in the peripheral pixel region. However, in the image display state, a black display in which no voltage is applied to the display electrode is maintained.

  Patent Document 1 discloses an electrophoretic display device in which a display pixel region is formed by arranging a large number of image cells in which charged particles are sealed in a moving space separated from each other by partition walls, and a method for manufacturing the same. Here, after all electrodes and barrier ribs are formed on the display substrate, charged particles are injected into the moving space surrounded by the barrier ribs, and then the transparent particles are placed on the barrier ribs to seal the charged particles in the moving space. ing.

  Patent Document 2 discloses an electrophoretic display device that performs pixel display by moving charged particles between a rising surface of a partition wall surrounding a display surface and the display surface. The pixel display cell is enclosed in a white display electrode disposed on the display surface, a partition electrode disposed on a rising surface of the partition wall surrounding the display surface, and a moving space surrounded by the display surface and the partition wall. And black charged particles are dispersed in the dispersion liquid.

JP-A-5-307197 JP 9-2111499 A

  In the particle movement type display device disclosed in Patent Document 1, after forming partition walls on the display substrate, each display cell is applied by applying a dispersion liquid in which charged particles are dispersed on the display substrate using a slit coater or the like. Charged particles are injected into the moving space.

  At this time, a voltage is applied between the display electrode on the display surface and the coating head, and the charged particles in the applied dispersion liquid are quickly adsorbed to the display electrode, so that the applied dispersion liquid is applied to the display substrate. The number of charged particles injected for each display cell can be made almost uniform even if it moves slightly.

  However, when charged particles are injected using this method, it is difficult to align the number of charged particles injected in the outer peripheral portion of the display pixel region where the display cells are arranged in a plane as compared to the inner portion. . This is because the concentration of charged particles in the dispersion liquid tends to vary at both ends of the coating head (slit nozzle), and the behavior of the dispersion liquid applied from the coating head to the display substrate is closer to the inner part in the outer peripheral portion of the display pixel region. It is because it is not stable.

  If the number of charged particles in each display cell is slightly different for simple black-and-white two-gradation display, there is no problem. However, when half-tone display is performed by changing the covering state of the display surface with charged particles. If the number of charged particles in each display cell is different, the gradation for the same voltage drive is different, and the quality of image display is lowered. In particular, when RGB color filters are arranged in three adjacent display cells and full color display is performed with the gradation balance of the three display cells, the gradation variation among the display cells causes a decrease in the saturation of the display image. It is fatal to cause uneven color.

  Therefore, in the above-described method, only the central portion where charged particles are injected relatively uniformly is used exclusively as the display pixel region, and the outer peripheral portion surrounding the display pixel region is generally used in a liquid crystal display device. For the above, it has been proposed to use a peripheral pixel region (abandoned region) that is not driven during image display.

  However, unlike a liquid crystal display device that automatically displays black (light-shielding) if no voltage is applied, the particle moving display device can achieve a desired gradation if no voltage is applied even in the peripheral pixel region. Cannot be displayed. Further, even if the same voltage is applied, a display cell having a small number of charged particles is unsightly because the display gradation is different from the surroundings.

  An object of the present invention is to provide a particle movement type display device that can form a peripheral pixel region having a good appearance by setting a desired gradation in a display cell without applying a voltage.

  The particle movement type display device of the present invention is a particle movement type display device that performs display for each display cell according to the covering state of the display surface surrounded by the partition wall with the charged particles. The electrode member and the partition wall are substantially the same as the display cell. The non-display cells having the display surface colored in substantially the same color as the charged particles are arranged in a strip shape outside the display pixel region in which the display cells are arranged in a plane shape.

  In the particle movement type display device of the present invention, the non-display cell is handled in the same manner as the display cell and the charged particle injection process is performed, so that the charged particle injection state in the non-display cell is sacrificed and the corner of the display pixel region is sacrificed. The number of charged particles injected into a large number of display cells in the display pixel region can be made uniform.

  And since the display surface of the non-display cell is colored in almost the same color as the charged particles, the display surface can be displayed with or without charged particles, that is, with or without voltage applied to the electrodes. A display state of the same gradation covered with charged particles can be formed. That is, since the color of the peripheral pixel area and the color of the charged particles are substantially equal, the display of the observed peripheral pixel area does not depend on the position and amount of the charged particles.

  Note that the coloration of the display surface referred to here is any method that makes the hue and density of the portion of the display surface that can be seen appear to be covered with charged particles, for example, selective display electrodes arranged on the display surface. It includes surface coloring treatment, formation of a single color layer of a target color formed on the display surface, formation of a target color by mixing a plurality of different color layers.

  Therefore, it is possible to form a peripheral pixel region having a good appearance outside the display pixel region by setting a gradation equal to that when the non-display cell is covered with the charged particles without applying voltage, that is, without power consumption.

  Hereinafter, an electrophoretic display device 100 according to an embodiment of the present invention will be described in detail with reference to the drawings. The particle movement type display device of the present invention is not limited to the constituent members of the embodiments described below, and various embodiments in which some or all of the constituent members are replaced with other constituent members having the same function, for example, The present invention can also be implemented by an electrophoretic display device having a display cell structure different from that of the electrophoretic display device 100.

  Further, although the electrophoretic display device 100 is a reflective type that does not have a backlight, the present invention may be implemented as a transmissive or transflective device in which a backlight is provided behind the display substrate.

  In addition, the electrophoretic display device 100 performs display unit display using a combination of the white display electrode 4 and the black charged particles 7, but the combination of the colors of the display electrode 4 and the charged particles 7 is not limited thereto.

  Note that the general structure, general manufacturing method, driving method, and the like of the electrophoretic display devices disclosed in Patent Documents 1 and 2 are different from the gist of the present invention. Detailed explanations are also omitted.

<First Embodiment>
FIG. 1 is a plan view of the electrophoretic display device of the first embodiment, FIG. 2 is an explanatory diagram of a cross-sectional configuration of display cells and non-display cells, and FIG. 3 is an explanatory diagram of a method for manufacturing the electrophoretic display device. In FIG. 2, (a) is a non-display cell and (b) is a display cell. In FIG. 3, (a)-(f) is explanatory drawing of each process.

  As shown in FIG. 1, the electrophoretic display device 100 according to the first embodiment has a display pixel region 16 of 100 mm × 100 mm in which a large number of display pixels 19 are arranged in a grid, arranged in the center of the display substrate 1 to display a display. A peripheral pixel region 17 having a width of 10 mm in which a large number of peripheral pixels 18 are arranged in a strip shape is disposed outside the pixel region 16. On the outside of the peripheral pixel region 17, an adhesive seal region 15 for integrally bonding a pair of opposing substrates is formed.

  As shown in FIG. 2B, the three display cells 19R, 19G, and 19B constituting the display pixel 19 are colored layers 9 that are R (red), G (green), and B (blue) color filters. 10 and 11, respectively, and one pixel 19 is displayed in full color according to the gradation balance of the three display cells 19R, 19G, and 19B.

  As shown in FIG. 2A, the three non-display cells 18R, 18G, and 18B constituting the peripheral pixel 18 are colored layers 9, 10, R (red), G (green), and B (blue). By superimposing 11, black having substantially the same color as the charged particles 7 is exhibited.

  As shown in FIG. 2, the display cells 19R, 19G, and 19B and the non-display cells 18R, 18G, and 18B each have a size of 100 μm square, and are configured to be equal except for the laminated state of the colored layers 9, 10, and 11. And are continuously formed on the display substrate 1 at the same time. A thin film transistor element 2 is formed on the display substrate 1, and a white display electrode 4 that also serves as a reflector is formed on the thin film transistor element (TFT) 2 via an interlayer insulating layer 3.

  The thin film transistor element 2 is controlled by a large number of scanning signal lines (not shown) and a large number of write signal lines which are three-dimensionally crossed on the display substrate 1 and arranged in a grid pattern. The electrophoretic display device 100 of the present embodiment is an active matrix system that dynamically drives the display cells 18R, 18G, and 18B using the thin film transistor element 2, but a display cell driving system other than the active matrix system, such as a passive matrix system. It may be adopted.

  A partition wall 5 is equally formed between adjacent non-display cells 18G and 18B (display cells 19G and 19B), and a non-display cell 18B (display) surrounded by the display substrate 1, the partition wall 5, and the transparent substrate 6 is displayed. The moving space 13 for each cell 19) is filled with a dispersion liquid 12 in which charged particles 7 are dispersed. A common electrode 8 is formed on the base surface of the partition wall 5, and the display electrode 4 and the common electrode 8 are separated by insulating colored layers 9, 10, and 11.

  As shown in FIG. 2B, the colored layers 9, 10, 11 in the display pixel region 16 (FIG. 1) are arranged for each of the display cells 19R, 19G, 19B with a stripe-like periodicity. Yes. The colored layers 9, 10, and 11 are formed of R (red), G (green), and B (blue) color filter materials. ), G (green), and B (blue) transmitted light are extracted.

  As shown in FIG. 2A, in the peripheral pixel region 17 (FIG. 1), the colored layers 9, 10, and 11 have the same stripe-like periodicity as the display pixel region 16 (FIG. 1). Although arranged, in the non-display cell 18R where the colored layer 9 should originally exist due to this periodicity, the colored layers 10 and 11 are formed only on the display electrode 4. Similarly, in the non-display cell 18G where the colored layer 10 should originally exist, the colored layers 9 and 11 are formed only on the display electrode 4, and in the display cell 18B where the colored layer 11 originally exists, the colored layer 9 and 10 are formed so as to overlap only on the display electrode 4. On the display electrodes 4 of the non-display cells 18R, 18G, and 18B on which the color filter materials of R (red), G (green), and B (blue) are stacked, the entire wavelength region of the reflected light is absorbed. A black display equal to the particle 7 is obtained.

  In addition, as long as the color of the laminated colored layer and the color of the charged particle 7 are equal, it is not always necessary to laminate all the colored layers 9, 10, 11. In addition, when the number of the colored layers 9, 10, 11 is 4 or more, or 2 types, a plurality of types of colored layers are laminated on the display electrode 4 with the same regularity to realize the same color display as the charged particles 7. it can.

  The common electrode 8 is colored substantially the same color as the charged particles 7, that is, black. For coloring the common electrode 8, at least a part of the material of the conductive thin film layer constituting the common electrode 8 may be the same color material as the charged particles 7, or an insulating layer (same color as the charged particles 7) on the common electrode 8. A chemical treatment layer or the like may be formed.

  Since the three colored layers 9, 10, and 11 are laminated on the display electrode 4 of the non-display cell 18B, the conductivity of the common electrode 8 formed so as to cover the three colored layers 9, 10, and 11 is stacked. A bulge corresponding to the two colored layers 9 and 10 is formed in the thin film layer. The common electrode 8 of the non-display cell 18B has an opening formed in the conductive thin film layer on the display electrode 4 while leaving the conductive thin film layer covering the rising slope portion.

  In the display cells 18R, 18G, and 18B in the peripheral pixel region 17 (FIG. 1) formed in this way, the colors of the display cells 18R, 18G, and 18B observed from the observer through the transparent substrate 6 are the same as those of the charged particles 7. Since it is substantially equal to the color, a stable black display can be obtained regardless of the number and position of the charged particles 7 in the display cells 18R, 18G, and 18B.

  In the non-display cell 18B (18G), the two colored layers 9, 10 (9, 11) are removed at the base portion of the partition wall 5, and the height of the formation surface of the partition wall 5 is set to the display cell 19R, 19G and 19B are equally aligned, so that even when the partition wall 5 is formed of a material having a large shrinkage during formation, the height of the upper end of the partition wall 5 is the same in the display pixel region 16 and the peripheral pixel region 17, and the partition wall 5 Inadequate sealing due to the difference in the height of the upper end of the substrate (adhesion failure between the partition walls 5 and the transparent substrate 6) and inconvenience at the time of charged particle injection can be suppressed.

  Further, in the peripheral pixel region 17 (FIG. 1), the charged particles 7 can be collected on the display surface by applying a voltage to the display electrode 4. It is possible to prevent the charged particles 7 from overflowing to the outside in the display cells 18R, 18G, and 18B or being left on the partition walls 5. In other words, since the position of the charged particles 7 in the non-display cells 18R, 18G, and 18B can be controlled by the electric field, sealing failure due to the presence of the charged particles 7 above the partition walls 5 can be suppressed.

  Next, a method for manufacturing the electrophoretic display device of the first embodiment will be described. As shown in FIG. 3A, first, a thin film transistor element (TFT) 2 is formed as a drive unit on a display substrate 1 such as glass, and the thin film transistor element 2 is covered with an interlayer insulating layer 3. Then, an aluminum thin film is formed on the interlayer insulating layer 3 in which the opening of the contact hole is formed, and the thin film transistor element is formed by patterning to the contour of each of the display cells 19R, 19G, 19B (non-display cells 18G, 18B, 18G). The display electrode 4 that also serves as a reflection surface connected to the electrode 2 is formed.

  Next, an ultraviolet curable resist material colored R (red) is applied onto the display substrate 1 on which the display electrodes 4 are formed. For the display cells 19R, 19G, and 19B (FIG. 2B), only the columns of the display cells 19R are exposed to form the striped colored layer 9, but the display cells 19G and 19B have a colored layer. 9 is not formed. However, the non-display cells 18R, 18G, and 18B are also exposed on the display electrodes 4 of the non-display cells 18G and 18B, and the colored layer 9 is formed also on the display electrodes 4 of the non-display cells 18G and 18B.

  Next, as shown in FIG. 3B, a G (green) ultraviolet curable resist material is applied on the display substrate 1 on which the colored layer 9 is formed. For the display cells 19R, 19G, and 19B (FIG. 2B), only the columns of the display cells 19G are exposed to form the stripe-shaped colored layer 10, and the display cells 19R and 19B include a colored layer. 10 is not formed. However, the non-display cells 18R, 18G, and 18B are also exposed on the display electrodes 4 of the non-display cells 18R and 18B, and the colored layer 10 is formed also on the display electrodes 4 of the non-display cells 18R and 18B.

  Next, as shown in FIG. 3C, a B (blue) ultraviolet curable resist material is applied onto the display substrate 1 on which the colored layers 9 and 10 are formed. For the display cells 19R, 19G, and 19B (FIG. 2B), only the columns of the display cells 19B are exposed to form the stripe-shaped colored layer 10, and the display cells 19R and 19G have a colored layer. 10 is not formed. However, for the non-display cells 18R, 18G, and 18B, the colored layer 11 is also formed on the display electrodes 4 of the non-display cells 18R and 18G by exposing and curing the display electrodes 4 of the non-display cells 18R and 18G. Form.

  Thereby, in the display pixel region 16 shown in FIG. 1, striped color filters of R (red), G (green), and B (blue) are periodically arranged. In the peripheral pixel region 17, R (red), G (green), and B (blue) color filters are arranged in the same cycle as the display pixel region 16, but R (red) and G (green) are displayed on the display electrode 4. ) And B (blue) color filters are superimposed on each other.

  As a result, for the non-display cells 18R, 18G, and 18B in the peripheral pixel region 17, the rise of two layers by the colored layers 9, 10, and 11 at the center of the display surface (on the display electrode 4) is the non-display cells 18R, 18G. , 18B. However, since the space between the non-display cells 18R, 18G, and 18B has been removed from two of the colored layers 9, 10, and 11, the height is equal to the space between the display cells 19R, 19G, and 19B. It is aligned.

  Next, as shown in FIG. 3D, a conductive thin film layer of the common electrode 8 is formed on the display substrate 1 on which the colored layers 9, 10, and 11 are formed. The conductive thin film layer is a black thin film in which a CrO / Cr material is formed. The conductive thin film layer is patterned in a lattice pattern by forming an opening in the center of the display surface. At this time, an opening is formed so that the edge of the common electrode 8 of the non-display cells 18R, 18G, and 18B in the peripheral pixel region 17 overlaps the stack of R (red), G (green), and B (blue) color filters. Therefore, light leakage due to incomplete absorption is prevented. Since the common electrode portion is black which is the color of CrO, the peripheral pixel region 17 is entirely black due to the laminated color filter and the common electrode 8.

  Next, as shown in FIG. 3E, the partition wall 5 is formed by applying a partition wall material and patterning it in a lattice shape. Since the structure of the colored layers 9, 10, 11 and below on the base surface of the partition wall 5 is the same in the display pixel region 16 and the peripheral pixel region 17 shown in FIG. 1, a region combining the display pixel region 16 and the peripheral pixel region 17. A partition wall 5 having a constant height as a whole is formed.

  Next, as shown in FIG. 3 (f), the transparent dispersion liquid 12 and the black charged particles 7 are placed in the moving space 13 surrounded by the partition walls 5, the common electrode 8, and the colored layers 9, 10, and 11. Fill. At this time, the display substrate 1 is moved horizontally while extruding the dispersion liquid 12 mixed with the charged particles 7 from the slit nozzle of the slit coater, and a region where the display pixel region 16 and the peripheral pixel region 17 are combined is formed by the slit nozzle. Scan. Further, a voltage is applied between the slit nozzle and the display electrode 2 to quickly collect the charged particles 7 on the display surface, thereby preventing the charged particles 7 from flowing or unevenly injected.

  Finally, the adhesive sealing region 15 shown in FIG. 1 is formed, the transparent polycarbonate transparent substrate 6 (FIG. 2) is fixed on the partition wall 5, and the dispersion liquid 12 and the charged particles 7 are sealed. The electrophoretic display device 100 is completed.

  In the peripheral pixel region 17 of the electrophoretic display device 100 formed as described above, the color of the display surface in the non-display cells 18R, 18G, and 18B and the color of the charged particles 7 are both black. Stable black display can be achieved regardless of the number and position of the charged particles 7 in 18R, 18G, and 18B. Further, since the structure of the base surface of the partition wall 5 is the same in the peripheral pixel region 17 and the display pixel region 16, the height of the partition wall 5 is also equal, and sealing failure due to the difference in the height of the partition wall 5 can be suppressed. Furthermore, since the position of the charged particles 7 in the moving space 13 can be controlled by the display electrode 2 and the common electrode 8 also in the peripheral pixel region 17, the charged particles 7 existing on the partition wall 5 at the time of sealing are displayed on the display surface (bottom) by an electric field. It is possible to suppress the sealing failure due to the sandwiching of the charged particles 7.

  Therefore, according to the first embodiment, the number of charged particles in the non-display cells 18R, 18G, and 18B is substantially equalized by making the colors of the non-display cells 18R, 18G, and 18B substantially the same as the colors of the charged particles 7. Regardless of the position of the charged particle, the display of the peripheral pixel region 17 can be stably maintained at a constant display.

  Further, by making the upper end height of the partition wall 5 uniform between the display pixel region 16 and the peripheral pixel region 17, and by controlling the charged particles 7 in the peripheral pixel region 17 with an electric field, the difference in the height of the partition wall 5, In addition, sealing failure due to the charged particles 7 existing above the partition walls 5 can be suppressed, and good display quality and yield of the electrophoretic display device 100 can be obtained.

Second Embodiment
FIG. 4 is an explanatory diagram of a cross-sectional configuration of display cells and non-display cells in the electrophoretic display device of the second embodiment. In FIG. 4, (a) is a non-display cell and (b) is a display cell. The electrophoretic display device of the second embodiment is formed in the same manner as in the first embodiment except for the laminated state of the colored layers 9, 10, 11, and 21 in the peripheral pixels 18. Therefore, in FIG. 4, the same components as those in FIG.

  As shown in FIG. 4B, the display pixel 19 includes a display cell 19R in which colored layers 9, 10, and 11 that are R (red), G (green), and B (blue) color filters are formed. Full color display is possible by gradation balance of 19G and 19B.

  As shown in FIG. 4A, the three non-display cells 18S, 18H, and 18C constituting the peripheral pixel 18 are R (red), G (green), and B (patterned similarly to the display pixel 19). Blue) colored layers 9, 10, and 11 are formed one by one, and the upper side of the display electrode 4 is shielded from light by the black colored layer 21.

  That is, the R (red), G (green), and B (blue) colored layers 9, 10, and 11 are equally striped in the entire region including the display pixel region 16 and the peripheral pixel region 17 shown in FIG. After patterning, a resist material in which an insulating black pigment is dispersed is laminated over the entire region, and the colored layer 21 is patterned only in the same shape and at the same position as the display electrode 4 only in the peripheral pixel region 17. Left behind.

  The common electrode 8 colored substantially the same color as the charged particles 7 forms an opening above the display electrode 4, leaving a portion overlapping the peripheral portion of the black colored layer 21, so that the non-colored layer 21 is not formed. Light leakage due to sufficient light shielding is prevented.

  In the peripheral pixel region 17 (FIG. 1) of the electrophoretic display device of the second embodiment formed in this way, the color of the peripheral pixel region 17 observed by the observer is substantially equal to the color of the charged particles 7. Therefore, a stable black display can be obtained regardless of the number and position of the charged particles 7 in the peripheral pixel 18.

  Moreover, since the height of the upper end of the partition wall 5 is the same in the display pixel region 16 and the peripheral pixel region 17, sealing failure due to the difference in the height of the upper end of the partition wall 5 can be suppressed. Further, since the position of the charged particles 7 can be controlled by the electric field applied between the display electrode 4 and the common electrode 8 in the peripheral pixel region 17, sealing failure due to the presence of the charged particles 7 on the partition walls 5 can be suppressed. .

<Third Embodiment>
FIG. 5 is an explanatory diagram of a cross-sectional configuration of display cells and non-display cells in the electrophoretic display device of the third embodiment. In FIG. 5, (a) is a non-display cell and (b) is a display cell. The electrophoretic display device of the third embodiment is formed in the same manner as the second embodiment except for the arrangement state of the colored layers 9, 10, 11 in the peripheral pixels 18. Therefore, in FIG. 5, the same components as those in FIG.

  As shown in FIG. 5B, the display pixel 19 has three display cells 19E on which a transparent colored layer 9A is formed. The display cell 19D moves the charged particles 7 between the display surface and the common electrode 8 in accordance with the voltage applied between the display electrode 4 and the common electrode 8, and the covering state of the display surface by the charged particles 7 is changed. Different gradations are displayed. In other words, the display cell 19 </ b> D performs a gray scale display according to the exposed state of the white display electrode 4 observing the black charged particles 7.

  As shown in FIG. 5A, the peripheral pixel 18 forms a transparent colored layer (insulating layer) 9 </ b> A like the display pixel 19, but the black colored layer 21 is disposed above the display electrode 4. Shaded.

  That is, after laminating a transparent colored layer 9A over the entire region including the display pixel region 16 and the peripheral pixel region 17 shown in FIG. 1, a laminating resist material in which an insulating black pigment is dispersed over the entire region, Only in the peripheral pixel region 17, the colored layer 21 is left patterned in substantially the same shape and the same position as the display electrode 4.

  The common electrode 8 colored substantially the same color as the charged particles 7 forms an opening above the display electrode 4, leaving a portion overlapping the peripheral portion of the black colored layer 21, so that the non-colored layer 21 is not formed. Light leakage due to sufficient light shielding is prevented.

  In the peripheral pixel region 17 (FIG. 1) of the electrophoretic display device of the third embodiment formed in this way, the color of the peripheral pixel region 17 observed by the observer is substantially equal to the color of the charged particles 7. Therefore, a stable black display can be obtained regardless of the number and position of the charged particles 7 in the peripheral pixel 18.

  Further, since the height of the upper end of the partition wall 5 is the same in the display pixel region 16 and the peripheral pixel region 17, sealing failure due to the difference in the height of the upper end of the partition wall 5 can be suppressed. In addition, since the positions of the charged particles 7 can be controlled by the electric field applied between the display electrode 4 and the common electrode 8 in the peripheral pixel region 17, sealing failure due to the presence of the particles 7 on the partition wall 5 can be suppressed.

<Correspondence with Invention>
As shown in FIGS. 2A and 2B, the electrophoretic display device 100 according to the first embodiment has display cells 19 </ b> R, 19 </ b> G, and 19 </ b> G depending on the covering state of the display surface surrounded by the partition walls 5 with the charged particles 7. The gradation display for each 19B is performed. Then, the display electrodes 4, the common electrodes 8, and the partition walls 5 are arranged almost in the same manner as the display cells 19, and the display surfaces are made to be non-display cells 18R, 18G, and 18B, which are colored in the same color as the charged particles 7. 19 are arranged in a strip shape outside the display pixel region arranged in a plane.

  Accordingly, the charged particle injection state in the non-display cells 18R, 18G, and 18B is sacrificed by handling the non-display cells 18R, 18G, and 18B in the same manner as the display cells 19R, 19G, and 19B and performing the charged particle 7 injection process. In this manner, the number of charged particles 7 injected into the large number of display cells 19R, 19G, and 19B in the display pixel region 16 can be made uniform up to every corner of the display pixel region 16.

  The display surfaces of the non-display cells 18R, 18G, and 18B are colored in substantially the same color as the charged particles 7, so that a voltage is applied to the display electrode 4 with or without the charged particles 7. Even if it is not, a display state of the same gradation in which the display surface is covered with the charged particles 7 can be formed. In other words, since the color of the peripheral pixel region 17 and the color of the charged particles 7 are substantially equal, the observed display of the peripheral pixel region 17 does not depend on the position or amount of the charged particles 7.

  Accordingly, the gradation of the state in which the non-display cells 18R, 18G, and 18B are equally covered with the charged particles 7 is set without applying voltage, that is, without power consumption, and the display pixel regions 19R, 19G, and 19B are set. The peripheral pixel region 17 having a good appearance can be formed on the outside.

  In the electrophoretic display device 100 of the first embodiment, a plurality of adjacent display cells 19R, 19G, and 19B have transmissive colored layers 9, 10, and 11 of different colors on the display surface, and non-display cells 19R. , 19G, and 19B are arranged such that colored layers 9, 10, and 11 of different colors are superimposed on the display surface. Therefore, on the condition that the colored layers 9, 10 and 11 can be overlapped and the apparent color equivalent to the charged particles 7 can be expressed, the display equally covered with the charged particles 7 can be set in the non-display cells 19R, 19G and 19B. Then, the peripheral pixel region 17 can be formed by the same process and the same number of steps as when the peripheral pixel region 17 is not formed, and the surface coloring process of the display electrode 4 in the peripheral pixel region 17 and the lamination / patterning of the black colored layer (21) are performed. It is unnecessary.

  As shown in FIGS. 4A and 4B, the non-display cells 18S, 18H, and 18C in the electrophoretic display device of the second embodiment have a colored layer 21 that is substantially the same color as the charged particles 7 disposed on the display surface. is doing. Accordingly, light leakage can be avoided by the light shielding performance of the colored layer 21 that does not depend on the transmission characteristics of the colored layers 9, 10, 11.

  As shown in FIGS. 2A and 2B, the formation surface of the partition 5 in the electrophoretic display device 100 of the first embodiment has the same height in the display cell 19 and the non-display cell 18. Therefore, even if the partition wall 5 is formed using a material having a high shrinkage rate, the partition wall 5 having the same height in the display pixel region 16 and the peripheral pixel region 17 can be formed.

  The partition wall 5 in the electrophoretic display device 100 according to the first embodiment is formed on the common electrode 8 disposed so as to overlap the colored layers 9, 10, 11, and the common electrode 8 in the non-display cells 19 R, 19 G, 19 B is An opening that exposes the display surface is formed while being colored in substantially the same color as the charged particles 7. Therefore, the charged particles 7 can be injected while applying an electric field to the moving space 13 through the opening. Further, since the common electrode 8 forms a black matrix of the display surface, it is possible to prevent display contrast reduction, color mixture, and saturation reduction of display cells due to light leakage between adjacent display cells.

  In the method of manufacturing the electrophoretic display device 100 shown in FIG. 3, a conductive thin film layer having substantially the same color as that of the charged particles 7 is formed on the display substrate 1 on which the colored layers 9, 19, and 11 exhibiting substantially the same color as the charged particles 7 are formed. Then, the conductive thin film layer is patterned in a lattice shape to form an opening corresponding to the display surface, thereby forming the common electrode 8. Then, the partition wall 5 is formed at the center of the grid-like common electrode 8. Therefore, the black matrix and the partition wall 5 can be positioned more accurately than when the black matrix is formed on the transparent substrate 6 side. Further, a brighter display with an improved aperture ratio can be achieved as compared with the case where the black matrix is formed on the transparent substrate 6 side so that a wider area of the moving space can be seen from the transparent substrate 6 side.

  In the method of manufacturing the electrophoretic display device 100 shown in FIG. 3, an opening is formed while leaving a border surface by the common electrode 8 surrounding the display surface and overlapping the colored layers 9, 19, 11. Therefore, even if the partition walls 5 are not conductive, the charged particles 7 can be collected on the border surface to expose the display surface.

It is a top view of the electrophoretic display device of a 1st embodiment. It is explanatory drawing of the cross-sectional structure of a display cell and a non-display cell. It is explanatory drawing of the manufacturing method of an electrophoretic display device. It is explanatory drawing of the cross-sectional structure of the display cell and non-display cell in the electrophoretic display device of 2nd Embodiment. It is explanatory drawing of the cross-sectional structure of the display cell and non-display cell in the electrophoretic display device of 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Display substrate 2 Thin-film transistor element 3 Interlayer insulation layer 4 Electrode member (display electrode)
5 Bulkhead 6 Transparent substrate 7 Charged particle 8 Electrode member, thin film electrode layer (common electrode), conductive thin film layers 9, 10, 11, 21 Colored layer, insulating layer (colored layer)
12 Dispersing liquid 13 Moving space 15 Sealing area 16 Display pixel area 17 Peripheral pixel area 18 Peripheral pixel 19 Display pixel

Claims (7)

In the particle movement type display device that performs display for each display cell by the covering state of the display surface surrounded by the partition walls with the charged particles,
A non-display cell in which the electrode member and the partition wall are arranged in substantially the same manner as the display cell, and the display surface is colored in substantially the same color as the charged particles, and a display pixel region in which the display cell is arranged in a planar shape. A particle movement type display device characterized by being arranged in a strip shape on the outside. A plurality of adjacent display cells each have a transmissive colored layer of a different color on the display surface,
2. The particle movement type display device according to claim 1, wherein the non-display cells are arranged such that the colored layers of different colors are overlapped on the display surface.   2. The particle movement type display device according to claim 1, wherein the non-display cell includes a colored layer having substantially the same color as the charged particles on the display surface.   4. The particle movement type display device according to claim 2, wherein the partition formation surface has the same height in the display cell and the non-display cell. 5.   The barrier ribs are formed on a thin film electrode layer disposed on the colored layer, and the thin film electrode layer in the non-display cell is colored in substantially the same color as the charged particles and exposes the display surface. The particle movement type display device according to claim 4, wherein an opening is formed. In the manufacturing method of the particle movement type display device that performs display for each display cell by the covering state with the charged particles on the display surface surrounded by the partition walls,
Forming a conductive thin film layer having substantially the same color as the charged particles on a display substrate on which an insulating layer having substantially the same color as the charged particles is formed;
Forming the conductive thin film layer in a lattice shape to form an opening corresponding to the display surface;
A method for manufacturing a particle movement type display device, wherein the partition is formed in the center of the conductive thin film layer having a lattice shape. 7. The method of manufacturing a particle movement type display device according to claim 6, wherein the opening is formed leaving an edge surface of the conductive thin film layer surrounding the display surface and overlapping the insulating layer.

Images