JP2006317799A - Display apparatus and method for manufacturing the display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the number of manufacture steps of a display apparatus, and to enhance the yield on the manufacturing. <P>SOLUTION: The display apparatus is equipped with a first substrate 11, having a plurality of transmission electrodes 2a and a plurality of reflection electrodes 2b; a second substrate 21, having counter electrodes 4 facing the respective transmission electrodes 2a and reflection electrodes 2b; a display layer 7 disposed between the first substrate 11 and the second substrate 21; a plurality of first color layers 23a, disposed on the second substrate 21 (or the first substrate 11) corresponding to the respective transmission electrodes 2a; barrier walls 24 separating each color layer of the first color layers 23a; and a step part 24a as a part of the barrier wall 24, rendering the distance between the reflection electrode 2b and the counter electrode 4 to be smaller than the distance between the transmission electrode 2a and the counter electrode 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a display device and a method for manufacturing the display device.

  As a display device, a liquid crystal display device using a liquid crystal is used in various fields. Liquid crystal display devices are thin, lightweight, and have low power consumption, and thus are used in portable information terminals, computers, televisions, and the like.

  The liquid crystal display device includes an array substrate having a plurality of pixel electrodes, a counter substrate having a counter electrode facing each pixel electrode, and a liquid crystal layer held between the array substrate and the counter substrate. In addition to such a configuration, the color liquid crystal display device includes a color filter having a plurality of colored layers of each color of R (red), G (green), and B (blue).

  Among color liquid crystal display devices, a transflective color liquid crystal display device has been proposed in order to obtain a good display indoors and outdoors (see, for example, Patent Document 1). This transflective color liquid crystal display device includes a transmissive portion having a transmissive electrode that is a pixel electrode that transmits light and a reflective portion having a reflective electrode that is a pixel electrode that reflects light in the same pixel. .

  Such a transflective color liquid crystal display device functions as a transmissive liquid crystal display device that uses light from a backlight for display by a transmissive portion in a dark place such as indoors, and in a bright place such as outdoors. It functions as a reflective liquid crystal display device that is used for display by reflecting external light by the reflecting portion. Thereby, in a bright place, an image can be displayed without using a backlight, so that power consumption can be greatly reduced.

  Further, in a transflective color liquid crystal display device, in order to obtain good display characteristics in both the transmissive part and the reflective part, the liquid crystal layer in the reflective part may be made thinner than the liquid crystal layer in the transmissive part. At this time, a step portion (bump) that controls the thickness of the liquid crystal layer of the reflection portion is formed in the reflection portion. The stepped portion is provided on the color filter, or is provided on the array substrate or the counter substrate so as to face the color filter.

Here, when a color filter is manufactured by an ink jet apparatus or the like that ejects ink, an isolation wall that separates the colored layers of each color is formed on the substrate, and the colored layer is formed on the substrate on which the isolation wall is formed. A color filter is manufactured by dripping ink for use and drying and curing the dropped ink.
JP 2002-341128 A

  However, when a semi-transmissive color liquid crystal display device having a step portion is manufactured using the color filter manufacturing step as described above, the step of forming the isolation wall and the step of forming the step portion are separately performed. As a result, the number of manufacturing steps increases, and as a result, the manufacturing yield decreases.

  The present invention has been made in view of the above, and an object of the present invention is to reduce the number of manufacturing steps of the display device and to improve the manufacturing yield.

  According to an embodiment of the present invention, in the display device, a first substrate having a plurality of transmissive electrodes that transmit light and a plurality of reflective electrodes that reflect light, the plurality of transmissive electrodes, A second substrate having a counter electrode opposed to the plurality of reflective electrodes; a display layer provided between the first substrate and the second substrate; and the second substrate or the second substrate. A plurality of first colored layers provided on the substrate in correspondence with the plurality of transmissive electrodes, an isolation wall separating the plurality of first colored layers for each colored layer, and a part of the isolation wall And it is providing the level | step-difference part which shortens the distance between the said reflective electrode and the said counter electrode compared with the distance between the said transmissive electrode and the said counter electrode.

  In the first feature of the present invention, by providing the step portion as a part of the isolation wall, it becomes possible to form the isolation wall and the step portion in the same manufacturing process, so the number of manufacturing steps of the display device is reduced. Is done.

  According to a second feature of the present invention, in the method for manufacturing a display device, a plurality of transmissive electrodes that transmit light and a first substrate that includes a plurality of reflective electrodes that reflect light, or the plurality of the plurality of transmissive electrodes. On the second substrate having a transmissive electrode and a counter electrode facing the plurality of reflective electrodes, a plurality of first colored layers respectively corresponding to the plurality of transmissive electrodes are separated for each colored layer, and the reflective A step of integrally forming a step portion that shortens a distance between the electrode and the counter electrode compared to a distance between the transmission electrode and the counter electrode; and a step of integrally forming the isolation wall and the step portion. Forming the plurality of first colored layers on the first substrate or the second substrate.

  In the second feature of the present invention, since the isolation wall and the stepped portion are integrally formed, they can be formed in the same manufacturing process, so that the number of manufacturing processes of the display device is reduced.

  According to the present invention, it is possible to reduce the number of manufacturing steps of the display device and improve the manufacturing yield.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS.

[Configuration of display device]
First, the configuration of the display device 1 according to the first embodiment will be described.

  As shown in FIG. 1, the display device 1 according to the first embodiment includes an array substrate 3 having a plurality of pixel electrodes 2, a counter substrate 5 having a counter electrode 4 facing each pixel electrode 2, and an array substrate. 3 and a counter substrate 5 are provided with a display layer 7 provided by a sealing material 6.

  The display layer 7 is made of a liquid crystal material. The display layer 7 functions as a liquid crystal layer. On each pixel electrode 2 and the counter electrode 4, alignment films 8a and 8b for defining the alignment direction of liquid crystal molecules are provided. A light source 9 such as a backlight for irradiating light is provided below the array substrate 3.

  As shown in FIG. 2, the display device 1 includes a semi-transmissive region R1 and a transmissive region R2 in a display region for displaying an image. The semi-transmissive region R1 is a region that uses both light from the light source 9 and external light (for example, sunlight) for display. The transmissive region R2 is a region that uses only light from the light source 9 for display. The display area is an area where an image is displayed by a change in the alignment state of the liquid crystal.

  In the semi-transmissive region R1, as shown in FIG. 3, in the same pixel S, the display device 1 includes a transmissive portion T having a transmissive electrode 2a that is a pixel electrode 2 that transmits light, and a pixel electrode 2 that reflects light. The reflection part H which has the reflective electrode 2b which is is provided. That is, in the semi-transmissive region R1, the display device 1 includes a transmissive portion T and a reflective portion H for each pixel S. Here, the transmissive portion T is a portion that transmits light from the light source 9 and is used for display. The reflective portion H is a portion that reflects external light and uses it for display. On the other hand, in the transmissive region R2, the display device 1 includes only the transmissive portion T in the pixel S.

  The array substrate 3 includes a first substrate 11 having optical transparency and insulating properties such as a glass substrate, and a plurality of transmission electrodes 2a provided on the inner surface (the surface on the display layer 7 side) on the first substrate 11. The reflective electrode 2b provided on the inner surface of the first substrate 11 via the insulating layer 12, the alignment film 8a provided so as to cover them, and the λ / 4 wavelength provided on the outer surface of the first substrate 11 It comprises a plate 13 and a polarizing plate 14 provided on the λ / 4 wavelength plate 13.

  The transmissive electrode 2a is formed of a transparent conductive material such as indium tin oxide (ITO). The reflective electrode 2b is made of a light-reflective conductive material such as aluminum.

  Note that a plurality of signal lines and a plurality of scanning lines (both not shown) are provided on the first substrate 11 so as to intersect with each other in a lattice shape (matrix shape). The transmission electrode 2a and the reflection electrode 2b are connected to the signal line and the scanning line via a switch element (not shown). As the switch element, for example, a thin film transistor is used.

  The counter substrate 5 includes a second substrate 21 having optical transparency and insulating properties such as a glass substrate, and a black matrix (BM) 22 provided on the inner surface (the surface on the display layer 7 side) on the second substrate 21. A plurality of colored layers 23a of R (red), G (green), and B (blue) colors provided corresponding to the black matrix 22, and a separating wall 24 that separates the colored layers 23a for each colored layer 23a. The counter electrode 4 provided on each colored layer 23a and the isolation wall 24, the alignment film 8b provided on the counter electrode 4, the diffusion plate 25 provided on the outer surface of the second substrate 21, and the diffusion plate Λ / 4 wavelength plate 26 provided on 25 and a polarizing plate 27 provided on the λ / 4 wavelength plate 26.

  The black matrix 22 is provided for each pixel S in a lattice shape so as to face the peripheral portions of the transmission electrode 2a and the reflection electrode 2b. The black matrix 22 is made of, for example, multiple chrome. Each colored layer 23a is provided to face each transmissive electrode 2a. The colored layers 23a for the respective colors are formed of ink having a corresponding color pigment.

  The isolation wall 24 has, as part thereof, a stepped portion 24a for controlling the thickness of the display layer 7 of the reflective portion H. The isolation wall 24 is formed of, for example, a transparent resin.

  The step portion 24 a is a bump that shortens the distance between the reflective electrode 2 b and the counter electrode 4 compared to the distance between the transmissive electrode 2 a and the counter electrode 4. The stepped portion 24a is provided, for example, facing the reflective electrode 2b. Due to the stepped portion 24a, the thickness of the display layer 7 in the reflective portion H becomes thinner than the thickness of the display layer 7 in the transmissive portion T. Thereby, there is a difference between the phase difference (retardation) of the external light transmitted back and forth through the display layer 7 of the reflection portion H and the phase difference of the light passing through the display layer 7 of the transmission portion T from the light source 9 in one direction. Since it becomes small, the display characteristic of the display apparatus 1 improves.

  A plurality of spacers 27 that define the distance are provided between the array substrate 3 and the counter substrate 5. The spacer 27 is formed on the counter electrode 4 with a transparent resin or the like. The height of the spacer 27 is set so that the distance between the array substrate 3 and the stepped portion 24a is, for example, about 2.5 μm.

  Here, in the first embodiment, the thickness of the display layer 7 of the reflection portion H is defined by the spacer 27 to approximately 2.5 μm. On the other hand, the thickness of the display layer 7 of the transmissive portion T is defined to be approximately 5 μm. For this reason, in the transmission part T, the light from the light source 9 enters the display layer 7 from the array substrate 3 side and causes a phase difference of λ / 2 before reaching the counter substrate 5 side of the display layer 7. On the other hand, in the reflection portion H, the external light enters the display layer 7 from the counter substrate 5 side and generates a phase difference of λ / 4 in the forward path from the display layer 7 to the reflection electrode 2b side. The phase difference of λ / 4 is generated in the return path from the reflection layer until it reaches the counter substrate 5 side of the display layer 7, so that the phase difference of λ / 2 is generated in the reciprocation.

  Therefore, by setting the thickness of the display layer 7 of the reflective portion H to approximately ½ of the thickness of the display layer 7 of the transmissive portion, the phase difference of light transmitted back and forth through the display layer 7 of the reflective portion H Since (retardation) and the phase difference of light passing through the display layer 7 of the transmission part T in one direction are equal, the light modulation rate is the same, and the display characteristics of the display device 1 are improved.

  Next, the isolation wall 24 will be described in detail.

  As shown in FIGS. 4, 5, and 6, the isolation wall 24 is provided between the colored layers 23 a and a plurality of step portions 24 a that function as column isolation walls provided between the colored layers 23 a and extending in the column direction. And a plurality of row isolation walls 24b extending in the row direction. Each step portion 24a and each row separation wall 24b are provided on the second substrate 21 in a lattice shape (matrix shape) (see FIG. 4). These step portion 24a and row separation wall 24b are integrally formed.

  In such a separation wall 24, each colored layer 23a is individually separated by each stepped portion 24a and each row separating wall 24b, thereby preventing color mixing in the colored layer 23a of each color. In addition, the colored layer 23a provided between each level | step-difference part 24a and between each row separation wall 24b functions as a 1st colored layer.

  The isolation wall 24, that is, the stepped portion 24a and the row isolation wall 24b are formed higher than the thickness of the colored layer 23a (see FIGS. 5 and 6). Thereby, it is possible to prevent liquid such as ink used when forming the colored layer 23a from leaking from the stepped portion 24a and the row separation wall 24b, and in particular, to prevent color mixing in the colored layer 23a of each color. can do.

  Here, the colored layer 23 a does not exist in the reflective portion H. For this reason, in the semi-transmissive region R1, the reflective display by the reflective portion H is a monochrome display. For example, when the display device 1 is used for a mobile phone or the like and the antenna, the remaining battery level, and the like are displayed by reflection display, a sufficiently good image can be displayed even by monochrome display.

  The display device 1 having such a configuration functions as a transmissive display device that displays an image by selectively transmitting light from the light source 9 through each transmissive portion T in a dark place such as a room. In addition, the display device 1 functions as a reflective display device that displays an image by selectively reflecting outside light by the respective reflecting portions H in a bright place such as outdoors. At this time, the display device 1 changes the amount of light transmitted through the display layer 7 of the transmissive portion T by applying a voltage between the transmissive electrode 2 a and the counter electrode 4, and between the reflective electrode 2 b and the counter electrode 4. The amount of light transmitted through the display layer 7 of the reflective portion H is changed by applying a voltage to the reflective portion H.

  Thus, according to the display device 1 of the first embodiment, by providing the step portion 24a as a part of the isolation wall 24, the isolation wall 24 and the step portion 24a can be formed in the same manufacturing process. Therefore, it is possible to reduce the number of manufacturing steps of the display device 1 and improve the manufacturing yield.

  Further, since the separation wall 24 is higher than the thickness of the colored layer 23a, it is possible to prevent liquid such as ink from leaking from the stepped portion 24a and the row separation wall 24b when the colored layer 23a is formed. Thus, an improvement in manufacturing yield can be realized.

[Manufacturing method of display device]
Next, a manufacturing method of the display device 1, particularly a manufacturing method of the counter substrate 5 will be described.

  First, as shown in FIG. 7A, a second substrate 21 is prepared. As the 2nd board | substrate 21, the board | substrate which has transparency and insulation, such as a glass substrate, is used.

  On the prepared second substrate 21, as shown in FIG. 7A, a black matrix 22 having an opening for each pixel S is formed. As the black matrix 22, multilayer chrome or the like is used.

  A photosensitive transparent resin layer 51 for forming the isolation wall 24 is formed on the second substrate 21 on which the black matrix 22 is formed, as shown in FIG. As the photosensitive transparent resin layer 51, an acrylic photosensitive resin or the like is used. As a method for forming the photosensitive transparent resin layer 51 on the second substrate 21, spin coating, slit coating, roll coater coating, or the like is used. As the photosensitive transparent resin layer 51, it is preferable to use a resin having ink resilience.

  Thereafter, as shown in FIG. 7A, the photosensitive transparent resin layer 51 on the second substrate 21 is exposed through a photomask 52 for patterning. The photomask 52 is a pattern mask for forming the isolation wall 24, that is, a mask for forming the stepped portion 24a and the row isolation wall 24b. The photomask 52 has a plurality of openings corresponding to the respective transmissive electrodes 2a.

  Next, the photosensitive transparent resin layer 51 on the second substrate 21 after the exposure is developed and cured by heating. Thereby, the isolation wall 24 is formed on the second substrate 21 as shown in FIG. That is, the step portion 24a and the row separation wall 24b are integrally formed on the second substrate 21 in the same process.

  Next, as shown in FIG. 7C, a red pigment is provided on the second substrate 21 on which the isolation wall 24 is formed by an ink discharge device (not shown) such as an ink jet device that discharges ink. Drip red ink. That is, it is dropped between the step portions 24a on the second substrate 21 and between the row separation walls 24b. This red ink is cured after drying to form a colored layer 23a. At this time, the red ink is dropped by an amount such that the thickness of the colored layer 23a is 1 to 4 μm thinner than the stepped portion 24a.

  Here, the ink discharge apparatus includes a transport unit that transports the recording medium in the sub-scanning direction, a discharge head that is movably provided in the main scanning direction, and the like. In this ink ejection apparatus, the second substrate 21 on which the separation wall 24 is formed is transported by the transport unit as a recording medium, and ink of each color is dropped onto the separation wall 24 by the ejection head. The ink drop amount is adjusted by the ink drop diameter, the number of ink drops, the transport speed of the second substrate 21, the movement speed of the ejection head, and the like.

  Thereafter, in order to avoid color mixing, the red ink is dried. Similarly, the green ink is dropped on the second substrate 21 on which the isolation wall 24 is formed and dried, and the blue ink is dropped and dried. Next, the inks of R, G, and B colors are cured by heat or ultraviolet rays. As a result, as shown in FIG. 7C, colored layers 23a of the respective colors are formed on the second substrate 21.

  Here, as the base material of each color ink, a base material that is cured by heat or ultraviolet rays is used. As this base material, a base material excellent in heat resistance and chemical resistance after curing is preferable. For example, an epoxy resin, a phenol resin, a melamine resin, or the like is used.

  In this manner, the counter electrode 4, the spacer 27, and the alignment film 8 b are stacked in that order on the second substrate 21 on which the colored layers 23 a and the isolation walls 24 of the respective colors are formed, thereby forming the counter substrate 5. In addition, the alignment film 8 a is stacked on the first substrate 11 having the plurality of pixel electrodes 2 to form the array substrate 3. Next, the counter substrate 4 and the array substrate 3 are arranged with the counter electrode 4 and the pixel electrode 2 facing each other, and a liquid crystal material is sealed between the counter substrate 5 and the array substrate 3 by a sealing material 6. The display layer 7 is formed. Thereafter, a λ / 4 wavelength plate 13 and a polarizing plate 14 are laminated in that order on the outer surface of the first substrate 11. Further, a diffusion plate 25, a λ / 4 wavelength plate 26, and a polarizing plate 27 are laminated on the outer surface of the second substrate 21 in that order. Thereby, the display device 1 is completed.

  Thus, according to the manufacturing method of 1st Embodiment, since it becomes possible to form them in the same manufacturing process by forming the isolation wall 24 and the level | step-difference part 24a integrally, the display apparatus 1 can be formed. The number of manufacturing steps can be reduced, and the manufacturing yield can be improved.

  Further, by forming the colored layer 23a by making the thickness of the colored layer 23a thinner than the height of the separating wall 24, liquid such as ink leaks from the stepped portion 24a and the row separating wall 24b when the colored layer 23a is formed. Therefore, the production yield can be improved.

(Second Embodiment)
A second embodiment of the present invention will be described with reference to FIGS.

  The second embodiment of the present invention is basically the same as the first embodiment. In the second embodiment, differences from the first embodiment will be described. In addition, the same part as the part demonstrated in 1st Embodiment is shown with the same code | symbol, and the description is abbreviate | omitted.

[Configuration of display device]
First, the configuration of the display device 1 according to the second embodiment will be described.

  In the second embodiment, as shown in FIG. 8, the display device 1 has a semi-transmissive region R1 on the entire surface of the display region, and as shown in FIGS. Has a recess 61 for accommodating the colored layer 23b. The recess 61 is filled with the colored layer 23b. In addition, the colored layer 23b accommodated in this recessed part 61 functions as a 2nd colored layer.

  The recess 61 is formed on the surface of the stepped portion 24a on the display layer 7 side. The depth of the concave portion 61 is set to approximately ½ of the thickness of the colored layer 23a of the transmission portion T. Thereby, the thickness of the colored layer 23b of the reflective portion H is approximately ½ of the thickness of the colored layer 23a of the transmissive portion T. Therefore, the color density of the colored layer 23b of the reflective portion H is approximately ½ of the color density of the colored layer 23a of the transmissive portion T. The colored layer 23b of the reflective part H is formed of the same material as the colored layer 23a of the transmissive part T.

  As described above, according to the display device 1 of the second embodiment, the same effect as that of the first embodiment is obtained, and the stepped portion 24a has the colored layer 23b by the concave portion 61, whereby the colored layer 23b. Is present in the reflective portion H, the reflective display by the reflective portion H can be changed to a color display. Further, the stepped portion 24a can have the colored layer 23b with a simple configuration of the recessed portion 61.

  Further, the depth of the concave portion 61 is set to approximately ½ of the thickness of the colored layer 23a of the transmissive portion T, so that the thickness of the colored layer 23b of the reflective portion H is equal to the thickness of the colored layer 23a of the transmissive portion T. Since the color density of the colored layer 23b of the reflective part H is substantially ½ of the color density of the colored layer 23a of the transmissive part T, the optical density of the reflective part H and the optical density of the transmissive part T Are almost the same. That is, the optical density when external light passes back and forth through the colored layer 23b of the reflective portion H (hereinafter simply referred to as the optical density of the reflective portion H) and the light from the light source 9 passes through the colored layer 23a of the transmissive portion T. The optical density when transmitted in one direction (hereinafter simply referred to as the optical density of the transmission part T) is substantially the same. As a result, the same level of luminance as that of the transmissive display can be obtained in the reflective display, and good color reproduction can be realized.

[Manufacturing method of display device]
Next, a manufacturing method of the display device 1 according to the second embodiment, particularly a manufacturing method of the counter substrate 5 will be described.

  First, as in the first embodiment, the second substrate 21 is prepared. A black matrix 22 having an opening for each pixel S is formed over the prepared second substrate 21 (see FIG. 7A). A photosensitive transparent resin layer 51 for forming the isolation wall 24 is formed on the second substrate 21 on which the black matrix 22 is formed (see FIG. 7A).

  Thereafter, the photosensitive transparent resin layer 51 on the second substrate 21 is exposed through a photomask 52 for patterning (see FIG. 7A). The photomask 52 is a pattern mask for forming the isolation wall 24, that is, a mask for forming the stepped portion 24a having the recess 61 and the row isolation wall 24b. The photomask 52 has a plurality of openings corresponding to the respective transmissive electrodes 2a. Further, the photomask 52 is a gradation mask. That is, the density of the mask portion that forms the plurality of recesses 61 corresponding to each reflective electrode 2b is set higher than that of the other mask portions. Thereby, the stepped portion 24a, the row separating wall 24b, and the recessed portion 61 can be simultaneously formed in the same process.

  Next, the photosensitive transparent resin layer 51 on the second substrate 21 after the exposure is developed and cured by heating. Thereby, as shown in FIG. 11, the isolation wall 24 is formed on the second substrate 21. That is, the stepped portion 24a having the recess 61 and the row isolation wall 24b are integrally formed on the second substrate 21 in the same process.

  Next, as shown in FIG. 11, red ink is dropped onto the second substrate 21 on which the isolation wall 24 is formed by an ink ejection device. That is, red ink is dropped between the step portions 24a on the second substrate 21 and between the row separation walls 24b, and further, red ink is dropped into the recess 61 of the step portion 24a. This red ink is cured after drying to form colored layers 23a and 23b. At this time, the red ink is dropped into the recess 61 by an amount that fills the recess 61.

  Thereafter, in order to avoid color mixing, the red ink is dried. Similarly, the green ink is dropped on the second substrate 21 on which the isolation wall 24 is formed and dried, and the blue ink is dropped and dried. Next, the inks of R, G, and B colors are cured by heat or ultraviolet rays. Thereby, as shown in FIG. 11, colored layers 23 a and 23 b of the respective colors are formed on the second substrate 21. Subsequent manufacturing steps are the same as those in the first embodiment.

  As described above, according to the manufacturing method of the second embodiment, the same effects as those of the first embodiment can be obtained. Further, the concave portion 61 is formed in the stepped portion 24a, and the colored layer 23b is formed in the concave portion 61. By forming, the colored layer 23b is present in the reflective portion H, so that the reflective display by the reflective portion H can be changed to a color display.

  Moreover, since the colored layer 23b can be easily provided on the stepped portion 24a by forming the concave portion 61 in the stepped portion 24a, the manufacturing process can be prevented from becoming complicated. Furthermore, by forming the recess 61 in the stepped portion 24a in the same step as the step of forming the stepped portion 24a and the row separating wall 24b, it is possible to suppress an increase in the manufacturing process and improve the manufacturing yield.

  Further, by forming the concave portion 61 by setting the depth of the concave portion 61 to be approximately ½ of the thickness of the colored layer 23a of the transmissive portion T, the thickness of the colored layer 23b of the reflective portion H is the colored layer of the transmissive portion T. Since the color density of the colored layer 23b of the reflective part H is substantially ½ of the color density of the colored layer 23a of the transmissive part T, the optical density of the reflective part H and the transmission The optical density of the portion T is substantially the same. As a result, the same level of luminance as that of the transmissive display can be obtained in the reflective display, and good color reproduction can be realized.

  In addition, the thickness of the colored layer 23b of the reflective portion H is set to approximately ½ of the thickness of the colored layer 23a of the transmissive portion T, whereby the ink that forms the colored layer 23b of the reflective portion H and the color of the transmissive portion T. Since the same ink can be used as the ink for forming the layer 23a, the manufacturing process can be prevented from becoming complicated, and the manufacturing yield can be improved.

  In the second embodiment, the recess 61 is formed with the depth of the recess 61 being approximately ½ of the thickness of the colored layer 23a of the transmission portion T. However, the present invention is not limited to this. For example, the recess 61 may be formed with the depth of the recess 61 being substantially the same as the thickness of the colored layer 23a of the transmission portion T. At this time, as the ink dropped into the recess 61, an ink having a color density that is approximately ½ of the ink that forms the colored layer 23a of the transmission part T is used. As a result, the color density of the colored layer 23b of the reflective part H is approximately ½ of the color density of the colored layer 23a of the transmissive part T, so that the optical density of the reflective part H and the optical density of the transmissive part T are substantially the same. become.

(Third embodiment)
A third embodiment of the present invention will be described with reference to FIGS.

  The third embodiment of the present invention is basically the same as the first embodiment. In the third embodiment, differences from the first embodiment will be described. In addition, the same part as the part demonstrated in 1st Embodiment is shown with the same code | symbol, and the description is abbreviate | omitted.

[Configuration of display device]
First, the configuration of the display device 1 according to the third embodiment will be described.

  In the third embodiment, as shown in FIG. 12, the stepped portion 24 a includes a through hole 71 that accommodates the colored layer 23 b and a filling member 72 that fills the through hole 71. The colored layer 23b accommodated in the through hole 71 functions as a second colored layer.

  The through hole 71 is formed at a substantially central portion of the step portion 24a. The filling member 72 is made of a transparent material. The filling member 72 is stacked on the colored layer 23 b accommodated in the through hole 71 and provided in the through hole 71. The thickness of the colored layer 23b of the reflective portion H is set to approximately ½ of the thickness of the colored layer 23a of the transmissive portion T. Thereby, the color density of the colored layer 23b of the reflective portion H is approximately ½ of the color density of the colored layer 23a of the transmissive portion T. The colored layer 23b of the reflective portion H and the colored layer 23a of the transmissive portion T are formed of the same material.

  As described above, according to the display device 1 of the third embodiment, the same effect as that of the first embodiment is obtained, and the stepped portion 24a has the colored layer 23b by the through hole 71, whereby the colored layer Since 23b exists in the reflection part H, the reflective display by the reflection part H can be made into a color display. Further, the stepped portion 24 a can have the colored layer 23 b with a simple configuration of the through hole 71.

  Furthermore, the color density of the colored layer 23b of the reflective part H is set to be approximately ½ of the thickness of the colored layer 23a of the transmissive part T by setting the thickness of the colored layer 23b of the reflective part H to be approximately ½ of the thickness of the colored layer 23a of the transmissive part T. Since the optical density of the reflective portion H and the optical density of the transmissive portion T are substantially the same, the luminance of the same level as that of the transmissive display can be obtained in the reflective display. Color reproduction can be realized.

[Manufacturing method of display device]
Next, a manufacturing method of the display device 1 according to the third embodiment, particularly a manufacturing method of the counter substrate 5 will be described.

  First, as shown in FIG. 13A, a second substrate 21 is prepared. As the 2nd board | substrate 21, the board | substrate which has transparency and insulation, such as a glass substrate, is used.

  A black matrix 22 having an opening for each pixel S is formed on the prepared second substrate 21 as shown in FIG. As the black matrix 22, multilayer chrome or the like is used.

  As shown in FIG. 13A, a photosensitive transparent resin layer 81 for forming the isolation wall 24 is formed on the second substrate 21 on which the black matrix 22 is formed. As the photosensitive transparent resin layer 81, an acrylic photosensitive resin or the like is used. As a method for forming the photosensitive transparent resin layer 81 on the second substrate 21, spin coating, slit coating, roll coater coating, or the like is used. As the photosensitive transparent resin layer 81, it is preferable to use a resin having ink resilience.

  Thereafter, as shown in FIG. 13A, the photosensitive transparent resin layer 81 on the second substrate 21 is exposed through a photomask 82 for patterning. The photomask 82 is a pattern mask for forming the isolation wall 24, that is, a mask for forming the stepped portion 24a having the through hole 71 and the row isolation wall 24b. The photomask 82 has a plurality of openings corresponding to the transmissive electrodes 2a and the reflective electrodes 2b, respectively.

  Next, the photosensitive transparent resin layer 81 on the exposed second substrate 21 is developed and heated to be cured. Thereby, the isolation wall 24 is formed on the second substrate 21 as shown in FIG. That is, the step portion 24 a having the through hole 71 and the row isolation wall 24 b are integrally formed on the second substrate 21 in the same process.

  Next, red ink is dropped onto the second substrate 21 on which the isolation wall 24 is formed, as shown in FIG. That is, red ink is dropped between the step portions 24a on the second substrate 21 and between the row separation walls 24b, and further, red ink is dropped into the through holes 71 of the step portions 24a. This red ink is cured after drying to form colored layers 23a and 23b. At this time, the red ink is dropped into the through-hole 71 so that the thickness of the colored layer 23b of the reflective portion H is about ½ of the thickness of the colored layer 23a of the transmissive portion T.

  Thereafter, in order to avoid color mixing, the red ink is dried. Similarly, the green ink is dropped on the second substrate 21 on which the isolation wall 24 is formed and dried, and the blue ink is dropped and dried. Next, the inks of R, G, and B colors are cured by heat or ultraviolet rays.

  Next, transparent ink is dropped into the through-hole 71 where the colored layer 23b is dropped by an ink discharge device. Accordingly, as shown in FIG. 13D, the transparent ink is laminated on the colored layer 23b as the filling member 72. Thereafter, the transparent ink is cured by heat or ultraviolet rays. As a result, as shown in FIG. 13D, colored layers 23 a and 23 b of the respective colors are formed on the second substrate 21. Subsequent manufacturing steps are the same as those in the first embodiment.

  As described above, according to the manufacturing method of the third embodiment, the same effects as those of the first embodiment can be obtained. Further, the through hole 71 is formed in the stepped portion 24a, and the colored layer is formed in the through hole 71. By forming 23b, the colored layer 23b is present in the reflective portion H, so that the reflective display by the reflective portion H can be changed to a color display.

  Further, by forming the through hole 71 in the stepped portion 24a, the colored layer 23b can be easily provided in the stepped portion 24a, so that the manufacturing process can be prevented from becoming complicated. Furthermore, by forming the through hole 71 in the stepped portion 24a in the same step as the step of forming the stepped portion 24a and the row isolation wall 24b, it is possible to suppress an increase in manufacturing steps and improve manufacturing yield. .

  Further, the color density of the colored layer 23b of the reflective portion H is set to be approximately ½ of the thickness of the colored layer 23a of the transmissive portion T by setting the thickness of the colored layer 23b of the reflective portion H to be approximately ½ of the thickness of the colored layer 23a of the transmissive portion T. Since the optical density of the reflective portion H and the optical density of the transmissive portion T are substantially the same, the luminance of the same level as that of the transmissive display can be obtained in the reflective display. Color reproduction can be realized.

  Further, by making the thickness of the colored layer 23b of the reflective portion H approximately half of the thickness of the colored layer 23a of the transmissive portion T, the ink that forms the colored layer 23b of the reflective portion H and the coloring of the transmissive portion T. Since the same ink can be used as the ink for forming the layer 23a, the manufacturing process can be prevented from becoming complicated, and the manufacturing yield can be improved.

  In the third embodiment, the thickness of the colored layer 23b of the reflective portion H is set to approximately ½ of the thickness of the colored layer 23a of the transmissive portion T. However, the present invention is not limited to this. The thickness of the colored layer 23b of the reflective portion H may be substantially the same as the thickness of the colored layer 23a of the transmissive portion T. At this time, as the ink dropped into the through-hole 71, an ink having a color density approximately half that of the ink forming the colored layer 23a of the transmission part T is used. As a result, the color density of the colored layer 23b of the reflective part H is approximately ½ of the color density of the colored layer 23a of the transmissive part T, so that the optical density of the reflective part H and the optical density of the transmissive part T are substantially the same. become.

(Fourth embodiment)
A fourth embodiment of the present invention will be described with reference to FIG.

  The fourth embodiment of the present invention is basically the same as the third embodiment. In the fourth embodiment, differences from the third embodiment will be described. Note that the same parts as those described in the third embodiment are denoted by the same reference numerals, and the description thereof is omitted.

[Configuration of display device]
First, the configuration of the display device 1 according to the fourth embodiment will be described.

  In the fourth embodiment, as shown in FIG. 14, the stepped portion 24a has a through hole 71 that accommodates the colored layer 23b. The through hole 71 is filled with the colored layer 23b. The colored layer 23b accommodated in the through hole 71 functions as a second colored layer.

  The through hole 71 is formed at a substantially central portion of the step portion 24a. Since the stepped portion 24a is formed thicker than the colored layer 23a of the transmissive portion T, the colored layer 23b in the through-hole 71, that is, the colored layer 23b of the reflective portion H is compared with the colored layer 23a of the transmissive portion T. Become thicker. At this time, if the color density of the colored layer 23b of the reflective part H and the color density of the colored layer 23a of the transmissive part T are the same, the difference between the optical density of the reflective part H and the optical density of the transmissive part T increases. Therefore, the color density of the colored layer 23b of the reflective part H is set to be smaller than the color density of the colored layer 23a of the transmissive part T.

  Thus, according to the display device 1 of the fourth embodiment, the same effects as those of the third embodiment can be obtained. Further, by making the color density of the colored layer 23b of the reflective part H smaller than the color density of the colored layer 23a of the transmissive part T, the difference between the optical density of the reflective part H and the optical density of the transmissive part T is reduced. Also in the reflective display, a luminance level close to that of the transmissive display can be obtained, and good color reproduction can be realized.

[Manufacturing method of display device]
Next, a manufacturing method of the display device 1 according to the fourth embodiment, particularly a manufacturing method of the counter substrate 5 will be described.

  Similar to the third embodiment, an isolation wall 24 is formed on the second substrate 21 (see FIG. 13B). Red ink is dropped on the second substrate 21 on which the isolation wall 24 is formed by an ink ejection device. That is, it is dropped between each stepped portion 24a on the second substrate 21 and each row separating wall 24b, and further, red ink is dropped into the through hole 71 of the stepped portion 24a. This red ink is cured after drying to form colored layers 23a and 23b. At this time, the red ink is dropped into the through hole 71 in an amount that satisfies the through hole 71.

  Thereafter, in order to avoid color mixing, the red ink is dried, the green ink is similarly dropped on the second substrate 21 on which the isolation wall 24 is formed, and the blue ink is dropped and dried. Next, the ink of each color is cured by heat or ultraviolet rays. Thereby, as shown in FIG. 14, colored layers 23 a and 23 b of the respective colors are formed on the second substrate 21. The subsequent manufacturing process is the same as that of the third embodiment.

  Thus, according to the manufacturing method of 4th Embodiment, there exists an effect similar to 3rd Embodiment, and also the color density of the colored layer 23b of the reflection part H is the color layer 23a of the transmission part T. By using ink that is smaller than the color density, the difference between the optical density of the transmissive part T and the optical density of the reflective part H is reduced, so that a brightness close to that of the transmissive display can be obtained in the reflective display. Reproducibility can be realized.

(Fifth embodiment)
A fifth embodiment of the present invention will be described with reference to FIG.

  The fifth embodiment of the present invention is basically the same as the first embodiment. In the fifth embodiment, differences from the first embodiment will be described. In addition, the same part as the part demonstrated in 1st Embodiment is shown with the same code | symbol, and the description is abbreviate | omitted.

[Configuration of display device]
A configuration of the display device 1 according to the fifth embodiment will be described.

  In the fifth embodiment, as shown in FIG. 15, the colored layers 23a of the respective colors are provided in a stripe shape for each color. The colored layers 23a of the same color are continuously arranged in a line every predetermined number. Note that the step portion 24a is provided between the colored layers 23a of each color in a stripe shape.

  As described above, according to the display device 1 of the fifth embodiment, the same effect as that of the first embodiment can be obtained, and further, the plurality of colored layers 23a can be continuously provided in a stripe shape, thereby separating walls. When the ink is dropped onto the second substrate 21 on which 24 is formed, the ink is leveled (smoothed) over a wide range and the coating thickness becomes uniform. The ink can be filled evenly between the portion 24a and each row separation wall 24b.

(Other embodiments)
In each of the first to fifth embodiments, a liquid crystal layer is used as the display layer 7, but the present invention is not limited to this.

  In each of the first to fifth embodiments, the photosensitive transparent resin layers 51 and 81 are heated and cured. However, the present invention is not limited to this. For example, after development, the photosensitive transparent resin layers 51 and 81 are cured by UV (ultraviolet) irradiation. You may make it do. In this case, an ultraviolet curable resin is used as the photosensitive transparent resin layers 51 and 81.

  In each of the first to fifth embodiments, spin coating, slit coating, roll coater coating, or the like is used as a method for forming the photosensitive transparent resin layers 51 and 81 on the second substrate 21. However, it is not limited to these.

  In each of the first to fifth embodiments, the ink repellent property is provided as a material for forming the photosensitive transparent resin layers 51 and 81 to be the separating wall 24 in order to impart the ink repelling property to the separating wall 24. Although resin is used, the present invention is not limited to this. For example, the surface of the isolation wall 24 may be subjected to plasma treatment with a fluorine-based gas to impart ink repellency to the isolation wall 24.

  In each of the first to fifth embodiments, the separation wall 24 is provided on the second substrate 21 as the counter substrate 5. However, the present invention is not limited to this, and for example, the first as the array substrate 3. An isolation wall 24 may be provided on the substrate 11.

It is sectional drawing which shows schematic structure of the display apparatus which concerns on the 1st Embodiment of this invention. It is a top view which shows the display area of the display apparatus shown in FIG. It is sectional drawing which shows schematic structure of the semi-transmissive area | region of the display apparatus shown in FIG. It is a top view which shows schematic structure of the opposing board | substrate with which the display apparatus shown in FIG. 1 is provided. It is sectional drawing of the X1-X1 line | wire of the opposing board | substrate shown in FIG. It is sectional drawing of the Y1-Y1 line | wire of the opposing board | substrate shown in FIG. 4A and 4B show a manufacturing process of the counter substrate, wherein FIG. 4A is a cross-sectional view of the first process, FIG. 4B is a cross-sectional view of the second process, and FIG. 4C is a cross-sectional view of the third process. It is a top view which shows the display area of the display apparatus which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows schematic structure of the semi-transmissive area | region of the display apparatus shown in FIG. It is a top view which shows schematic structure of the opposing board | substrate with which the display apparatus shown in FIG. 8 is provided. It is sectional drawing of the X2-X2 line of the display apparatus shown in FIG. It is sectional drawing which shows schematic structure of the opposing board | substrate with which the display apparatus which concerns on the 3rd Embodiment of this invention is provided. 12A and 12B show a manufacturing process of the counter substrate, wherein FIG. 12A is a sectional view of the first process, FIG. 12B is a sectional view of the second process, FIG. 12C is a sectional view of the third process, and FIG. It is sectional drawing of 4 processes. It is sectional drawing which shows schematic structure of the opposing board | substrate with which the display apparatus which concerns on the 4th Embodiment of this invention is provided. It is a top view which shows schematic structure of the opposing board | substrate with which the display apparatus which concerns on the 5th Embodiment of this invention is provided.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Display apparatus 2a Transmission electrode 2b Reflective electrode 4 Counter electrode 7 Display layer 11 1st board | substrate 21 2nd board | substrate 23a 1st colored layer 23b 2nd colored layer 24 Isolation wall 24a Step part 61 Recessed part 71 Through-hole

Claims (14)

A first substrate having a plurality of transmissive electrodes that transmit light and a plurality of reflective electrodes that reflect light;
A second substrate having a counter electrode facing the plurality of transmissive electrodes and the plurality of reflective electrodes;
A display layer provided between the first substrate and the second substrate;
A plurality of first colored layers provided on the first substrate or the second substrate so as to correspond to the plurality of transmission electrodes, respectively;
An isolation wall separating the plurality of first colored layers for each colored layer;
A step portion that is a part of the isolation wall and shortens the distance between the reflective electrode and the counter electrode compared to the distance between the transmissive electrode and the counter electrode;
A display device comprising:   The display device according to claim 1, wherein the isolation wall is higher than a thickness of the first colored layer.   The display device according to claim 1, wherein the step portion includes a second colored layer corresponding to the reflective electrode.   The display device according to claim 3, wherein the stepped portion has a recess that accommodates the second colored layer.   The display device according to claim 4, wherein a depth of the concave portion is approximately ½ of a thickness of the first colored layer.   The display device according to claim 3, wherein the step portion has a through hole that accommodates the second colored layer.   The display device according to claim 3, wherein a thickness of the second colored layer is approximately ½ of a thickness of the first colored layer. On a first substrate having a plurality of transmissive electrodes that transmit light and a plurality of reflective electrodes that reflect light, or on a second substrate having a counter electrode facing the plurality of transmissive electrodes and the plurality of reflective electrodes A distance between the reflective electrode and the counter electrode between the isolation wall separating the plurality of first colored layers corresponding to the plurality of transmissive electrodes for each colored layer, and the reflective electrode and the counter electrode. A step of integrally forming a stepped portion that is shorter than the distance of
Forming the plurality of first colored layers on the first substrate or the second substrate in which the isolation wall and the stepped portion are integrally formed; and
A method for manufacturing a display device, comprising:   9. The step of forming the plurality of first colored layers includes forming the first colored layer by making the thickness of the first colored layer thinner than the height of the isolation wall. Manufacturing method of display device.   9. The method for manufacturing a display device according to claim 8, wherein, in the step of forming the plurality of first colored layers, the first colored layer is formed by an ink ejection device that ejects ink. In the step of integrally forming the isolation wall and the stepped portion, a recess for accommodating a second colored layer corresponding to the reflective electrode is formed in the stepped portion,
The method of manufacturing a display device according to claim 8, wherein in the step of forming the plurality of first colored layers, the second colored layer is formed in the concave portion.   12. The method of manufacturing a display device according to claim 11, wherein the depth of the concave portion is approximately ½ of the thickness of the first colored layer. In the step of integrally forming the isolation wall and the stepped portion, a through hole that accommodates a second colored layer corresponding to the reflective electrode is formed in the stepped portion,
9. The method for manufacturing a display device according to claim 8, wherein in the step of forming the plurality of first colored layers, the second colored layer is formed in the through hole. 14. The method for manufacturing a display device according to claim 11, wherein the thickness of the second colored layer is approximately ½ of the thickness of the first colored layer.

Images