JP2008164703A - Display element and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device wherein a positional deviation between a parallax barrier and a pixel is suppressed. <P>SOLUTION: A filter layer 25 having the parallax barrier 24, and color filters 23r, 23g, and 23b arranged successively is formed on one main surface of a second substrate 24. The second substrate 22 where the filter layer 25 is formed is stuck on a first substrate 21 with the filter layer 25 interposed. The need to position the color filters 23r, 23g, and 23b and parallax barrier 24 is eliminated and the position shift between the parallax barrier 24 and pixel 11 can be suppressed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a display element capable of displaying different images in each direction when observed from different directions, and a manufacturing method thereof.

  Conventionally, a display such as a display element is generally used as a large display such as a personal computer and a television from a small display such as a mobile phone, a personal digital assistant (PDA), and a car navigation system.

  Conventional displays have been optimized to enable high-quality observation of the same image from different angles, but in recent years it has been called multiple-view display, displaying multiple different images simultaneously and observing individual images depending on the viewing angle direction. There is also a need for a display that can be used. For example, a vehicle-mounted display mounted on a car has a use such that a passenger in a passenger seat watches a movie or the like in addition to being used by a driver to check car navigation data such as a map and monitor information.

  Conventionally, such a multiple view display includes a display device that displays a plurality of images at the same time, and an optical device that displays the images separately by parallax so that the images can be viewed individually from a predetermined viewing angle direction. There is something.

  For example, as a display device, there is an active matrix TFT display element having a general RGB stripe structure. Among a plurality of pixels of such a display device, for example, for each of a plurality of columns in a direction in which an image is separated by parallax. A plurality of pixels alternately arranged constitute a plurality of pixel groups, and an individual image is displayed by each pixel group. In addition, as an optical device, there is a parallax barrier layer in which a light shielding portion that shields pixels of a display device and a slit portion that transmits light are alternately formed, and only one parallax barrier layer is formed on the front side of the display device. (For example, refer to Patent Document 1).

For example, when viewed from the predetermined viewing angle direction on the left side with respect to the front of the multiple view display, only the image of one pixel group is visually recognized through the slit portion, and the image of the remaining pixel group is the light shielding portion of the parallax barrier layer. Shaded. Similarly, when viewed from a predetermined viewing angle on the right side with respect to the front of the multiple view display, only the image of one pixel group is visually recognized through the slit portion, and the image of the remaining pixel group is the light shielding portion of the parallax barrier layer. Shaded. Accordingly, different images can be observed through the slit portion from different directions with one multiple view display.
JP-A-11-205822

  However, in the conventional multiple view display, after assembling the liquid crystal cell, there is a process of polishing the counter CF (color filter) substrate to a predetermined thickness and attaching a barrier substrate patterned with a parallax barrier. The liquid crystal cell may be damaged, and the barrier attaching step may not be reached.

  Also, in the barrier substrate bonding step, the current cell process cannot be used in the conventional method, and the operator performs bonding using an assembly machine, which may cause bonding misalignment.

  The present invention has been made in view of such a point, and an object of the present invention is to provide a display element in which a positional deviation between a parallax barrier and a pixel is suppressed, and a manufacturing method thereof.

  The present invention is a display element that has a plurality of pixels, and that can display different images in a plurality of pixel groups composed of a plurality of pixels that are alternately positioned among the pixels. A light modulation layer interposed between the pair of substrates, and one of the pair of substrates is provided on one transparent substrate and the one transparent substrate, and is displayed in each pixel group. A filter layer in which a parallax barrier that separates and displays images by parallax and a colored portion are sequentially arranged, and another transparent substrate that is bonded to the one transparent substrate with the filter layer interposed therebetween It is what.

  Further, the present invention includes a pair of substrates and a light modulation layer interposed between the pair of substrates, and a plurality of pixels are formed, and the plurality of pixels are alternately arranged among the pixels. A display element manufacturing method capable of displaying different images with a plurality of pixel groups, wherein a parallax barrier and a coloring unit are provided to separate and display the images to be displayed with the respective pixel groups on one transparent substrate. Are formed in parallel, and the one transparent substrate on which the filter layer is formed is bonded to another transparent substrate with the filter layer interposed therebetween.

  Then, a filter layer in which a parallax barrier and a colored portion are sequentially arranged is provided on one transparent substrate, and this one transparent substrate is bonded to another transparent substrate with the filter layer interposed therebetween.

  According to the present invention, it is possible to suppress misalignment between the parallax barrier and the pixel.

  Hereinafter, the structure of the display element of the 1st Embodiment of this invention is demonstrated with reference to drawings.

  In FIG. 1, reference numeral 1 denotes a multiple view display that is a liquid crystal display device as a display device. The multiple view display 1 includes a display device 2 that is a liquid crystal display element as a display element, and a back side of the display device 2. A backlight 3 for illuminating is provided.

  The display device 2 displays a plurality of images simultaneously. For example, the display device 2 is an active matrix TFT element, and an array substrate 5 as a substrate and a counter substrate 6 as a substrate are spaced at a predetermined interval via a spacer (not shown). A liquid crystal layer 7 as a light modulation layer is interposed between these substrates 5 and 6, and has two polarizing plates 8 and 9 on the backlight 3 side (light source side) and the observer side. . In the display device 2, pixel pixels, which are pixel portions having a plurality of pixels 11, are configured by combining the array substrate 5 and the counter substrate 6. Further, the display device 2 can display, for example, an interlaced image by a driving circuit (not shown), and can also display a plurality of different images.

  The array substrate 5 is provided with wirings (not shown) such as scanning lines and signal lines in a lattice pattern on a substrate 14 such as a light-transmitting glass substrate, and is a switching element in the vicinity of the intersection of these wirings. Each TFT is arranged in a matrix. The array substrate 5 is provided with a pixel electrode 15 which is a transparent electrode formed of, for example, ITO on a TFT or the like.

  On the other hand, the counter substrate 6 is also called a counter CF (color filter) substrate, and includes a first substrate 21 and a second substrate 22 as transparent substrates such as a glass substrate having translucency. A filter layer 25 having a plurality of parallax barriers 24 formed in a direction in which an image is separated by parallax such as a left-right direction and a color filter 23r, 23g, 23b, for example, as a coloring portion, is disposed between the two. Has been. Further, on the opposite side of the first substrate 21 from the filter layer 25, a counter electrode 26, which is a transparent electrode as a functional film made of, for example, ITO or the like, is provided.

  The functional film includes not only the counter electrode 26 but also an arbitrary film for forming the pixel 11 such as a black matrix.

  The parallax barrier 24 is formed from a resin in which a black pigment such as chromium or carbon black, which is a non-light transmissive metal, is dispersed, and is formed at the same time in the process of manufacturing the color filters 23r, 23g, and 23b. These are disposed between the color filters 23r, 23g, and 23b. That is, the parallax barrier 24 is disposed between the color filters 23r and 23g, between the color filters 23g and 23b, and between the color filters 23b and 23r.

  The filter layer 25 is formed on the main surface of the second substrate 22, which is a transparent substrate opposite to the liquid crystal layer 7, facing the first substrate 21, and bonds the first substrate 21 and the second substrate 22 together. Covered by layer 28.

  Here, the adhesive layer 28 is a transparent layer formed of, for example, a UV curable resin, and as this UV curable resin, for example, a material having no contractibility and having a refractive index equivalent to that of glass is desirable.

  As shown in FIGS. 1 and 2, the display device 2 includes a plurality of pixels 11a that are alternately positioned one by one in a direction in which an image is separated by parallax (the left-right direction in the drawing). By displaying different images between the pixel group constituted by the pixel group and the pixel group constituted by the plurality of pixels 11b, when viewed from the predetermined viewing angle direction L, the image is displayed by the pixel group of the plurality of pixels 11b. When the image is blocked by the parallax barrier 24, and the image displayed by the pixel group of the plurality of pixels 11a is viewed through each of the color filters 23r, 23g, and 23b, An image displayed by the pixel group of the pixel 11a is blocked by the parallax barrier 24, and an image displayed by the pixel group of the plurality of pixels 11b is viewed through the color filters 23r, 23g, and 23b. At this time, the light LR, LG, LB and the light RR, RG, RB that have passed through the RGB color filters 23r, 23g, 23b are visually recognized in the viewing angle directions L, R, so that images of these colors are displayed. It is mixed and visually recognized as a color image.

  Next, a method for manufacturing the display element according to the first embodiment will be described.

  First, as shown in FIG. 3, color filters 23r, 23g, 23b and a parallax barrier 24 are formed on the second substrate 22 (first step). For example, when the pitch of the pixels 11 on the array substrate 5 is 63.5 μm, the width of the color filters 23r, 23g, 23b is 40 μm, the width of the parallax barrier 24 is 87 μm, and the parallax between the RGB color filters 23r, 23g, 23b. A barrier 24 is formed.

  Thereafter, as shown in FIG. 4, an adhesive layer 28 such as a UV curable resin is applied to a thickness of 35 μm, and the substrates 21 and 22 are bonded together (second step).

  Further, as shown in FIG. 5, mechanical polishing or chemical polishing is performed until the first substrate 21 has a predetermined thickness, for example, 55 μm in this case (third step).

  Further, as shown in FIG. 6, a counter electrode 26 such as an ITO electrode is formed on the main surface of the polished first substrate 21 facing the liquid crystal layer 7, that is, on the main surface opposite to the second substrate 22. Thus, the counter substrate 6 is obtained (fourth step).

  Next, as shown in FIG. 7, pixel electrodes 15 and TFTs are formed in a matrix on the substrate 14 so as to obtain a desired pixel pitch, thereby obtaining the array substrate 5 (fifth step).

  Then, as shown in FIG. 8, the array substrate 5 and the counter substrate 6 are connected to each other through a spacer or the like so that the center lines of the parallax barrier 24 and the color filters 23r, 23g, and 23b coincide with the boundary between adjacent pixel electrodes. Then, a liquid crystal material is injected to form the liquid crystal layer 7 to obtain the display device 2 (sixth step).

  Finally, as shown in FIG. 1, the display device 2 is combined with the polarizing plates 8 and 9 and the backlight 3 to form the multiple view display 1 (seventh step).

  As described above, according to the first embodiment, the filter layer 25 in which the parallax barrier 24 and the color filters 23r, 23g, and 23b are sequentially arranged is provided on the second substrate 22, and the second substrate 22 is provided. Compared with the conventional case in which the second substrate on which the parallax barrier is formed is bonded to the first substrate on which the color filter is formed by bonding with the first substrate 21 with the filter layer 25 interposed therebetween. Thus, alignment work between the color filters 23r, 23g, and 23b and the parallax barrier 24 is not required, and positional deviation between the parallax barrier 24 and the pixel 11 can be suppressed.

  Further, since the positional deviation between the parallax barrier 24 and the pixel 11 can be suppressed, the uniformity of the viewing angle of the display device 2 can be improved, and the occurrence of defects due to the positional deviation between the parallax barrier 24 and the pixel 11 can be suppressed. , Can improve the yield.

  In addition, in the conventional manufacturing method, after the liquid crystal layer is formed, the counter substrate is polished to a predetermined thickness, so that the counter substrate can be cracked or peeled off due to the pressure during polishing, and the pad portion can be corroded to produce an image. While there are many factors that reduce the yield such as disappearance, according to the present embodiment, only the substrates 21 and 22 with the color filters 23r, 23g, and 23b and the parallax barrier 24 provided in the polishing process are used in the polishing process. After the polishing, a liquid crystal material is injected to form the liquid crystal layer 7, that is, the liquid crystal layer 7 forming step is the final step, so that the polishing pressure differs between the central portion and the peripheral portion of the display device 2. As a result, it is possible to reduce the factors affecting the final yield, such as suppressing the breakage of the display device 2, and reducing the parallax barrier 24 and the pixels 11. Can be easily dealt with by the existing cell formation process, and the yield can be suppressed.

  Furthermore, since the first substrate 21 is polished before the liquid crystal layer 7 is formed, the profit and loss when a defective product is generated can be greatly reduced as compared with the case where the completed display device 2 is polished.

  Next, a second embodiment will be described with reference to FIGS. In addition, about the structure and effect | action similar to the said 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the second embodiment, as shown in FIG. 9, in the first embodiment, the filter layer 25 of the display device 2 is a transparent substrate on the side facing the liquid crystal layer 7. This is formed on the main surface facing the second substrate 22.

  In the manufacturing method of the display device 2, first, as shown in FIG. 10, color filters 23r, 23g, and 23b and a parallax barrier 24 are formed on the first substrate 21 (first step). At this time, the widths of the color filters 23r, 23g, 23b and the parallax barrier 24 are set in the same manner as in the first step of the first embodiment.

  Thereafter, as shown in FIGS. 11 to 15, the multiple view display 1 is obtained by the second to seventh steps similar to the second to seventh steps of the first embodiment.

  Also in the second embodiment, the first substrate 21 provided with the filter layer 25 is bonded to the second substrate 22 with the filter layer 25 interposed therebetween, so that the same as in the first embodiment. An effect can be produced.

  In each of the above embodiments, the substrate on which the filter layer 25 is formed is the counter substrate 6, but the filter layer 25 may be formed on the array substrate 5 side. In this case, the array substrate 5 is formed of a pair of transparent substrates, and, for example, a scanning line, a signal line, a TFT, a pixel electrode, and the like are provided as functional films, so that the same operational effects as those of the above embodiments can be obtained. be able to.

  Furthermore, any display element other than the liquid crystal display element can be used.

It is explanatory sectional drawing which shows the display element of the 1st Embodiment of this invention. It is expansion explanatory drawing which shows the effect | action of a display element same as the above. It is explanatory sectional drawing which shows the 1st process of the manufacturing method of a display element same as the above. It is explanatory sectional drawing which shows the 2nd process of the manufacturing method of a display element same as the above. It is explanatory sectional drawing which shows the 3rd process of the manufacturing method of a display element same as the above. It is explanatory sectional drawing which shows the 4th process of the manufacturing method of a display element same as the above. It is explanatory sectional drawing which shows the 5th process of the manufacturing method of a display element same as the above. It is explanatory sectional drawing which shows the 6th process of the manufacturing method of a display element same as the above. It is explanatory sectional drawing which shows the display element of the 2nd Embodiment of this invention. It is explanatory sectional drawing which shows the 1st process of the manufacturing method of a display element same as the above. It is explanatory sectional drawing which shows the 2nd process of the manufacturing method of a display element same as the above. It is explanatory sectional drawing which shows the 3rd process of the manufacturing method of a display element same as the above. It is explanatory sectional drawing which shows the 4th process of the manufacturing method of a display element same as the above. It is explanatory sectional drawing which shows the 5th process of the manufacturing method of a display element same as the above. It is explanatory sectional drawing which shows the 6th process of the manufacturing method of a display element same as the above.

Explanation of symbols

2 Display device as display element 5 Array substrate as substrate 6 Counter substrate as substrate 7 Liquid crystal layer as light modulation layer
11 pixels
21 First substrate as transparent substrate
22 Second substrate as transparent substrate
23r, 23g, 23b Color filters as colored parts
24 Parallax barrier
25 Filter layer
26 Counter electrode as a functional membrane

Claims (7)

A display element having a plurality of pixels and capable of displaying different images in a plurality of pixel groups composed of a plurality of pixels alternately positioned among these pixels,
A pair of substrates;
A light modulation layer interposed between the pair of substrates,
Either one of the pair of substrates is
A transparent substrate,
A filter layer provided on the one transparent substrate, in which a parallax barrier and a coloring portion are sequentially arranged in parallel to separate and display an image displayed in each pixel group by parallax;
A display device, comprising: the transparent substrate bonded to the one transparent substrate with the filter layer interposed therebetween. The display element according to claim 1, wherein the other transparent substrate is located on a side facing the light modulation layer. The display element according to claim 1, wherein the other transparent substrate is located on a side opposite to the light modulation layer side. A plurality of pixel groups each including a pair of substrates and a light modulation layer interposed between the pair of substrates, wherein a plurality of pixels are formed, and the pixels are alternately positioned among the pixels; A method of manufacturing a display element capable of displaying different images,
On one transparent substrate, a filter layer in which a parallax barrier and a colored portion are arranged in parallel in order to separate and display an image displayed in each pixel group by parallax,
A method for manufacturing a display element, comprising: bonding the one transparent substrate on which the filter layer is formed to another transparent substrate with the filter layer interposed therebetween. Polishing the other transparent substrate bonded to the one transparent substrate to a predetermined thickness,
A predetermined functional film is formed on the polished other transparent substrate as one of the pair of substrates,
The method for manufacturing a display element according to claim 4, wherein a light modulation layer is formed between any one of the pair of substrates and the other. The method for manufacturing a display element according to claim 4, wherein the other transparent substrate is positioned on a side facing the light modulation layer. The method for manufacturing a display element according to claim 4, wherein the other transparent substrate is positioned on a side opposite to the light modulation layer.

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