Embodiments of the present invention relate to a liquid crystal grating, a method for manufacturing the same and a 3D display device.
Currently, products having both a 3D display function and a touch control function get more and more attention. However, in prior art, both functions are mostly combined in a simple manner, and thus many problems occur.
Such a structure suffers from the following problems:
1. If the 3D unit 2 and the touch control unit 3 are combined together simply and mechanically, namely, a module of an add-on touch control screen plus a 3D display is adopted, this will lead to a complex manufacturing process, a high production cost and other problems, and moreover, the whole module has a larger thickness, and this also necessarily affect the 3D display effect.
2. When the structure shown in
3. In prior art, a Flexible Printed Circuit board (FPC) bonding area of the touch control unit 3 is suspended (as denoted by a broken-line circle in
Hereinafter, a process for manufacturing the structure of the 3D grating plus the add-on touch control screen in prior art will be described in combination with accompanied drawings, and it comprises:
Step 301, an alignment mark of a metal is produced on one surface (e.g. a bottom surface) of the upper substrate;
Step 302, the upper substrate is overturned, and the conductive layer, the first insulating layer, the touch control electrode layer, the second insulating layer and the protective layer of the touch control unit are produced on another surface (i.e. a top surface) of the upper substrate;
Step 303, the upper substrate is overturned again, and a strip-like electrode layer and a bonding area for bonding of pins are produced on the surface with the alignment mark.
In teems of the process flow, upon manufacturing the structure of the 3D grating plus the add-on touch screen in prior art, if all layers of the touch control unit are produced on the top surface of the upper substrate firstly, and next, all layers of the 3D grating are produced, then in this case, gold fingers of the FPC bonding area in the touch control unit may be etched off upon formation of a metal layer of the 3D grating. Furthermore, a surface of the touch control unit contacts transport roller too much in this process, surface scratches of the touch control unit tend to occur without the use of any protective measure. If all layers of the 3D grating are produced firstly and next, all layers of the touch control unit are produced, then the upper substrate (e.g. a glass substrate) will be overturned twice (one for a manufacturing process, and one for an alignment). Because overturning of the upper substrate needs to be made by hand in prior art, not only overturning number is increased and production capacity is reduced, but also overturning by hand may cause scratches. If the metal layer of the 3D grating is firstly manufactured on the upper substrate, all layers of the touch control unit are manufactured next, and then a 3D transparent electrode layer is fabricated, it is necessary for the substrate to be overturned twice as well in the manufacturing process although overturning number of the substrate upon alignment can be decreased.
To sum up, the structure of the 3D grating plus the add-on touch screen in prior art suffers from a larger signal interference problem, and moreover, there are more times of overturning the substrate in the manufacturing process, and this inevitably brings about more scratches on the substrate.
According to embodiments of the invention, there are provided a liquid crystal grating, a manufacturing method thereof and a 3D display device, by which, it is possible that a touch control unit in the liquid crystal grating is avoided from being interfered by an electric field, and furthermore, the overturning number of an upper substrate can be decreased, and then damage to a surface of the upper substrate is reduced and production capacity is enhanced.
In an aspect, an embodiment of the invention provides a manufacturing method of a liquid crystal grating, comprising: producing a conductive layer and an alignment mark on a top surface of an upper surface in accordance with a first preset pattern; producing a first insulating layer, a touch control electrode layer and a second insulating layer on the conductive layer in sequence; producing a plane electrode which is grounded on a bottom surface of the upper substrate which is opposite to the top surface; cell-assembling the upper substrate and a lower substrate in accordance with the alignment mark so as to form the liquid crystal grating, wherein there are strip-like electrodes on a top surface of the lower substrate, and the bottom surface of the upper substrate with the plane electrode formed faces the top surface of the lower substrate.
In another aspect, an embodiment of the invention provides a liquid crystal grating, comprising: an upper substrate; a lower substrate; an adhesive frame for bonding the edge of the upper substrate and the edge of the lower substrate hermetically; liquid crystal, located in a liquid crystal space surrounded by the upper substrate, the lower substrate and the adhesive frame; a plane electrode, which is formed on a surface of the upper substrate facing the liquid crystal and is grounded; and strip-like electrodes, formed on a surface of the lower substrate facing the liquid crystal.
In still another aspect, an embodiment of the invention provides a 3D display device, comprising: a display panel; a liquid crystal grating, which is disposed on a light exiting side of the display panel, and is the liquid crystal grating claimed as any of claims 8 to 12, wherein a surface of a lower substrate of the liquid crystal grating, on which no strip-like electrode is formed, faces the display panel.
In order to illustrate the technical solution of the embodiments of the invention more clearly, the drawings of the embodiments will be briefly described below; it is obvious that the drawings as described below are only related to some embodiments of the invention, but not limitative of the invention.
a to
In order to make objects, technical details and advantages of the embodiments of the invention apparent, the technical solutions of the embodiment will be described in a clearly and fully understandable way in connection with the drawings related to the embodiments of the invention. It is obvious that the described embodiments are just a part but not all of the embodiments of the invention. Based on the described embodiments herein, those skilled in the art can obtain other embodiment(s), without any inventive work, which should be within the scope of the invention.
In order to solve a problem present in prior art, an embodiment of the invention provides a manufacturing method of a liquid crystal grating, this method comprising:
Step 401, in accordance with a first preset pattern, a conductive layer and an alignment mark are produced on a top surface of an upper surface;
Step 402, a first insulating layer, a touch control electrode layer and a second insulating layer are produced on the conductive layer in sequence;
Step 403, a plane electrode which is grounded is produced on a bottom surface of the upper substrate which is opposite to the top surface;
Step 404, the upper substrate and the lower substrate are cell-assembled in accordance with the alignment mark so as to form the liquid crystal grating, wherein, the bottom surface of the upper substrate with the plane electrode formed is opposed to a top surface of the lower substrate with strip-like electrodes formed.
In the method provided by the embodiment of the invention, for the sake of convenience, the liquid crystal grating is used in the embodiment of the invention to replace a 3D grating plus add-on touch screen structure. In order to solve a problem present in prior art, the embodiment of the invention creatively provides the manufacturing method of the liquid crystal grating. At first, a step that, an alignment mark of a metal is produced on a bottom surface of an upper substrate in a 3D grating which is opposed to a lower substrate, is omitted in the manufacturing method according to the embodiment of the invention, but the conductive layer in a touch control unit is directly produced on the top surface of the upper substrate which is at a side opposite to the lower substrate side. Exemplarily, in accordance with the first preset pattern, the conductive layer and the alignment mark are produced simultaneously on the top surface of the upper surface through a patterning process. As shown in
Next, the upper substrate is overturned to make the bottom surface of the upper surface be toward top. By means of sputtering or chemical vapor deposition, the plane electrode is produced on the bottom surface. Exemplarily, the upper substrate is overturned so that a surface (the bottom surface) of the upper substrate without the touch control unit is toward top, and the plane electrode is formed on the bottom surface. When the liquid crystal grating operates, a voltage across the plane electrode is kept at zero volts, namely, a grounded voltage. As such, an impact of an electric field of a 3D control part in the liquid crystal grating on a touch control signal of the touch control unit is shielded, and in turn, a signal-to-noise ratio is improved. With the end of manufacturing the plane electrode, the upper substrate of the liquid crystal grating is basically completed.
Upon manufacturing the lower substrate, in accordance with a second preset pattern, the strip-like electrodes are produced on the top surface of the lower substrate which is opposed to the upper substrate and a connection part for a flexible circuit board is formed on the top surface of the lower substrate through a patterning process. Upon cell-assembling of the upper substrate and the lower substrate, in accordance with the alignment mark, a cell-assembling position for the upper substrate and the lower substrate is determined; with a sealant, the edge of the bottom surface of the upper substrate and the edge of the top surface of the lower substrate are sealed to form an adhesive frame; and liquid crystal is filled into a space formed by the upper substrate, the lower substrate and the adhesive frame. Wherein, after the upper substrate and the lower substrate are cell-assembled, the connection part for the flexible circuit board is located outside the space formed by the adhesive frame and the upper and lower substrates.
After the end of manufacturing the liquid crystal grating, the liquid crystal grating may be added to a liquid crystal panel. That is, the bottom surface of the lower substrate is adhered to the liquid crystal panel. For example, an Optical Clear Adhesive (OCA) may be used to adhere the lower substrate of the liquid crystal grating and edges of the liquid crystal panel together, where the liquid crystal grating is disposed on a light exiting side of the liquid crystal panel.
In addition, there is further the connection part for a FPC of the touch control unit on a top surface of the touch control unit, and the formation process of the connection part is no longer described here.
The manufacturing method of the liquid crystal grating provided by the embodiment of the invention will be described in detail below with the use of a specific example. A case that an upper substrate is processed firstly and then a lower substrate is processed is described as an example, it comprises the following steps:
Step 601, a metal layer is formed on a top surface of the upper substrate;
Step 602, in accordance with a first preset pattern, the metal layer is etched through a patterning process, so as to form a conductive layer of a touch control unit and an alignment mark for alignment of the upper and lower substrates; as shown in
Step 603, further, a first insulating layer, a touch control electrode layer, a second insulating layer and a protective layer are produced; as shown in
Step 604, the upper substrate is overturned, and a layer of transparent conductive material (e.g. ITO) is uniformly sprayed on a bottom surface of the upper substrate, so as to form a plane electrode. As shown in
Step 605, strip-like electrodes are produced on a top surface of the lower substrate, and a connection part for a flexible circuit board is formed on the top surface of the lower substrate. Exemplarily, as shown in
Step 606, a sealant 84 is provided at the edge of the lower substrate, and liquid crystal is injected within a region enclosed by the sealant; as shown in
Step 607, the relative relationship between the upper substrate and the lower substrate is determined in accordance with the alignment mark, and they are cell-assembled. As shown in
Up to here, manufacturing the liquid crystal grating according to the embodiment of the invention is completed.
After the end of manufacture of the liquid crystal grating, the following steps may further be used to assemble the liquid crystal grating and a display panel.
Exemplarily, the description will be given to an example in which a liquid crystal panel functions as the display panel.
Step 608, the liquid crystal grating is added to the liquid crystal panel, where the liquid crystal grating is disposed on a light exiting side of the liquid crystal panel. As shown in
Optionally, the display panel may also be a plasma display panel, an organic electroluminescence (OLED) display panel, an electronic ink display panel, or the like. If the display panel is a display panel of any other type, its setting method is the same as Step 608, and details are omitted here.
As can be seen from the above descriptions, with the use of the manufacturing method of the liquid crystal grating provided by the embodiment of the invention, the plane electrode formed on the bottom surface of the upper substrate in the liquid crystal grating is grounded, and a signal interference between the 3D control part and the touch control part is shielded. Furthermore, because the alignment mark is produced while the conductive layer of the touch control part is manufactured, overturning number of the substrate is decreased, and in turn, scratch, abrasion and so on of a substrate surface is reduced. In addition, the conductive layer and the alignment mark are formed at the same time, and thus the number of mask exposure is decreased, and the production cost is saved.
Based on the same inventive concept, according to an embodiment of the invention, there is further provided a liquid crystal grating, which is produced by using the above manufacturing method of the liquid crystal grating.
As shown in
It further comprises:
a plane electrode 805, which is formed on a surface of the upper substrate 801 facing the liquid crystal 804 and is grounded; and
strip-like electrodes 806, formed on a surface of the lower substrate 802 facing the liquid crystal 804.
Optionally, the liquid crystal grating further includes: a connection part 807 for a flexible circuit board, which is located on the surface of the lower substrate 802 facing the liquid crystal 804 and located outside a space in which the liquid crystal 804 is located.
Optionally, the liquid crystal grating further includes: a touch control unit, which is located on a surface of the upper substrate 801 apart from the liquid crystal 804. The touch control unit includes a conductive layer 808, a first insulating layer 809, a touch control electrode layer 810 and a second insulating layer 811, where, the touch control unit further includes an alignment mark 812 formed simultaneously with the conductive layer 808.
Additionally, on a top surface of the second insulating layer 811 of the touch control unit, there may be a flexible-circuit-board connection part 813 of a FPC of the touch control unit. The manufacturing process of the flexible-circuit-board connection part 813 adopts a manner well-known by those skilled in the art, and details are omitted here.
Based on the same inventive concept, according to an embodiment of the invention, there is further provided a 3D display device. As shown in
An example of the display panel 901 is a liquid crystal panel, in which, a TFT array substrate and a counter substrate are disposed opposite to each other so as to form a liquid crystal cell, and a liquid crystal material is filled in the liquid crystal cell. The counter substrate is such as a color filter substrate. A pixel electrode of each pixel unit of the TFT array substrate acts to apply an electric field for controlling the degree of rotation of the liquid crystal material, so that display operation is conducted. In some examples, the liquid crystal panel further includes a backlight source for providing the array substrate with backlight.
Another example of the display panel is an organic electroluminescence display device, in which, a pixel electrode of each pixel unit of a TFT array substrate functions as an anode or a cathode for driving an organic light emitting material to emit light, so that display operation is conducted.
The liquid crystal grating, the manufacturing method thereof and the 3D display device provided by embodiments of the invention, the conductive layer and the alignment mark are produced on the top surface of the upper substrate in accordance with the first preset pattern; the first insulating layer, the touch control electrode layer and the second insulating layer are produced on the conductive layer in sequence; the plane electrode which is grounded is produced on the bottom surface of the lower substrate; and the upper substrate and the lower substrate are cell-assembled in accordance with the alignment mark, so as to form the liquid crystal grating, wherein, on the top surface of the lower substrate which is opposed to the upper substrate, there are strip-like electrodes. Because the plane electrode formed on the bottom surface of the upper substrate in the liquid crystal grating is grounded, signal interference between the 3D control part in the liquid crystal grating and the touch control part is shielded. Furthermore, because the alignment mark is produced while the conductive layer of the touch control part is manufactured, overturning number of the substrate is decreased, and in turn, scratch, abrasion and so on of a substrate surface is reduced. In addition, the conductive layer and the alignment mark are formed at the same time, and thus the number of mask exposure can also be decreased, and the production cost is saved.
It should be understood by those skilled in the art that various changes and modifications may be made in these embodiments without departing from the scope and spirit of the present invention. If these changes and modifications fall into the range of the claims and their equivalents, the present invention also is directed to include these changes and modifications.
Number | Date | Country | Kind |
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201210135675.8 | May 2012 | CN | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/CN2012/086342 | 12/11/2012 | WO | 00 | 6/20/2013 |