CN102879958A - Array substrate, method for manufacturing same and liquid crystal display device - Google Patents
Array substrate, method for manufacturing same and liquid crystal display device Download PDFInfo
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- CN102879958A CN102879958A CN2012103722706A CN201210372270A CN102879958A CN 102879958 A CN102879958 A CN 102879958A CN 2012103722706 A CN2012103722706 A CN 2012103722706A CN 201210372270 A CN201210372270 A CN 201210372270A CN 102879958 A CN102879958 A CN 102879958A
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- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 2
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Abstract
The invention discloses an array substrate, a method for manufacturing the same and a liquid crystal display device, and relates to the technical field of liquid crystal display. Horizontal electric fields are generated between a common electrode and a pixel electrode which are arranged on the array substrate, so that the liquid crystal display device realizes a display function. The array substrate comprises a supporting substrate, the pixel electrode and the common electrode, and the pixel electrode is positioned on the inner side of the supporting substrate in a pixel area; the pixel electrode comprises a plurality of wall-shaped electrodes which are connected with one another electrically, the common electrode comprises a plurality of second wall-shaped electrodes which are connected with one another electrically, and the first wall-shaped electrodes and the second wall-shaped electrodes are arranged at intervals; and the wall-shaped electrodes are transparent, and two opposite side walls of each wall-shaped electrode are respectively perpendicular to the supporting substrate and are flat, so that the horizontal electric fields can be generated among the first wall-shaped electrodes and the second wall-shaped electrodes which are adjacent to one another when the array substrate is electrified. The scheme of the invention is applicable to designing and producing display devices.
Description
Technical Field
The invention relates to the technical field of liquid crystal display, in particular to an array substrate, a manufacturing method of the array substrate and a liquid crystal display device.
Background
Thin Film Transistor-Liquid Crystal displays (TFT-LCDs) have the characteristics of small size, low power consumption, no radiation, relatively low manufacturing cost and the like, and occupy a leading position in the current flat panel Display market.
The main structure of the TFT-LCD comprises an array substrate and a color film substrate which are oppositely arranged and clamped with liquid crystal therebetween, wherein grid lines for providing scanning signals, data lines for providing data signals and pixel electrodes for forming pixel points are formed on the array substrate. In order to realize the display function, a common electrode is also needed to be arranged, so that when the power is on, the liquid crystal rotates under the action of an electric field formed by the common electrode and the pixel electrode so as to control the light transmittance, and further, the display is realized.
Depending on the electrode structure, current TFT-LCDs may include: AD-SDS (Advanced-Superdimensional Switching) type, IPS (In Plane Switching) type, TN (Twist Nematic) type, and the like. In the AD-SDS type liquid crystal display, a common electrode is arranged on an array substrate, and an electric field generated by the edge of each pixel electrode and an electric field generated between the pixel electrode and the common electrode in the same plane form a multi-dimensional electric field; in the IPS mode lcd, the common electrode is also disposed on the array substrate, and a lateral electric field is generated between the common electrode and the pixel electrode; in the TN liquid crystal display, a common electrode is provided on a color film substrate, and a vertical electric field is generated between the common electrode and a pixel electrode.
The invention provides a liquid crystal display device with a novel electrode structure.
Disclosure of Invention
The embodiment of the invention provides an array substrate, a manufacturing method thereof and a liquid crystal display device, which are used for generating a horizontal electric field between a common electrode and a pixel electrode arranged on the array substrate so that the liquid crystal display device realizes a display function.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in one aspect, an embodiment of the present invention provides an array substrate, including: the substrate comprises a substrate base plate, a pixel electrode and a common electrode, wherein the pixel electrode and the common electrode are positioned at the inner side of the substrate base plate and in a pixel area; the pixel electrode comprises a plurality of electrically connected first wall-shaped electrodes, the common electrode comprises a plurality of electrically connected second wall-shaped electrodes, and the first wall-shaped electrodes and the second wall-shaped electrodes are arranged at intervals; the wall-shaped electrode is transparent, two opposite side walls of the wall-shaped electrode are respectively perpendicular to the substrate base plate and are flat, and therefore when the substrate base plate is electrified, a horizontal electric field is generated between the first wall-shaped electrode and the second wall-shaped electrode which are adjacent to each other.
Optionally, the two sidewalls of the wall-shaped electrode are parallel.
Optionally, the sidewall of the first wall-shaped electrode is parallel to the sidewall of the second wall-shaped electrode adjacent to the first wall-shaped electrode.
Optionally, the pixel region includes: a transmissive region and a reflective region; the array substrate further includes: a reflective layer disposed in the reflective region; the pixel electrode positioned in the transmission area is connected with the pixel electrode positioned in the reflection area, and the distance between the adjacent wall-shaped electrodes positioned in the transmission area is smaller than that between the adjacent wall-shaped electrodes positioned in the reflection area; or the pixel electrode in the transmission area is not connected with the pixel electrode in the reflection area, the distance between the adjacent wall-shaped electrodes in the transmission area is equal to the distance between the adjacent wall-shaped electrodes in the reflection area, and when the power is on, the voltage difference between the pixel electrode in the transmission area and the common electrode is greater than the voltage difference between the pixel electrode in the reflection area and the common electrode.
Optionally, the array substrate further includes: an insulating layer disposed on the reflective layer, the insulating layer extending over both the transmissive region and the reflective region; the thickness of the insulating layer in the transmission area is larger than that of the insulating layer in the reflection area, and the difference between the thicknesses of the insulating layer in the two areas is the thickness of the reflection layer.
Optionally, the wall-shaped electrode comprises a wall-shaped protrusion and an electrode pattern covering the wall-shaped protrusion; the two opposite side walls of the wall-shaped protrusion are respectively perpendicular to the substrate base plate and are flat, the wall-shaped protrusion is made of transparent organic materials, and the electrode pattern is made of transparent conductive materials.
In another aspect, an embodiment of the present invention provides a liquid crystal display device, including: the liquid crystal display panel comprises an array substrate, a color film substrate and a liquid crystal positioned between the two substrates, wherein the array substrate and the color film substrate are arranged oppositely, and the array substrate is the array substrate.
Optionally, the top end of the first wall-shaped electrode and/or the second wall-shaped electrode is in contact with the inner side of the color film substrate; or a gap is reserved between the top ends of the first wall-shaped electrode and the second wall-shaped electrode and the inner side of the color film substrate.
Optionally, the liquid crystal is a blue phase liquid crystal.
Optionally, the liquid crystal display device further includes: the first quarter-wave plate, the first half-wave plate and the first polaroid are arranged on the outer side of the array substrate; and the second quarter-wave plate, the second half-wave plate and the second polaroid are arranged on the outer side of the color film substrate.
In another aspect, an embodiment of the present invention further provides a method for manufacturing an array substrate, including:
manufacturing a transparent organic material film on a substrate base plate at least provided with a gate metal layer and a source drain metal layer, and forming a plurality of wall-shaped bulges by utilizing a composition process; two opposite side walls of the wall-shaped bulge are perpendicular to the substrate base plate and are flat; the gate metal layer includes: a gate line, a gate electrode of a thin film transistor; the source drain metal layer includes: the data line, the source electrode of the thin film transistor and the drain electrode of the thin film transistor;
manufacturing a transparent conductive film, and forming electrode patterns of a pixel electrode and a common electrode by using a composition process; the pixel electrode comprises a plurality of electrically connected first wall-shaped electrodes, the common electrode comprises a plurality of electrically connected second wall-shaped electrodes, the first wall-shaped electrodes and the second wall-shaped electrodes are arranged at intervals, and the wall-shaped electrodes comprise wall-shaped protrusions and electrode patterns covering the wall-shaped protrusions.
The array substrate, the manufacturing method thereof and the liquid crystal display device provided by the invention have the advantages that the pixel electrode comprising a plurality of electrically connected first wall-shaped electrodes and the common electrode comprising a plurality of electrically connected second wall-shaped electrodes are arranged on the array substrate, wherein the first wall-shaped electrodes and the second wall-shaped electrodes are arranged at intervals; the electrodes are designed into the wall-shaped structure with the two flat side walls, so that when the liquid crystal display device is electrified, the two electrodes are both surface electrodes, a horizontal electric field can be generated between the adjacent first wall-shaped electrode and the second wall-shaped electrode, and the liquid crystal display device can realize the display function under the action of the horizontal electric field.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a liquid crystal display device according to the present invention when no voltage is applied;
FIG. 2 is a schematic structural diagram of the LCD device shown in FIG. 1 when a voltage is applied;
FIG. 3 is a schematic structural diagram of a pixel structure in the LCD device shown in FIG. 1;
FIG. 4 is a schematic structural diagram of another liquid crystal display device according to the present invention when no voltage is applied;
FIG. 5 is a schematic structural diagram of the LCD device shown in FIG. 4 when a voltage is applied;
FIG. 6 is a schematic structural diagram of a pixel structure in the LCD device shown in FIG. 4;
FIG. 7 is a schematic structural diagram of a wall-shaped electrode according to the present invention;
FIG. 8 is a schematic structural diagram of another liquid crystal display device according to the present invention when no voltage is applied;
FIG. 9 is a schematic structural diagram of the LCD device shown in FIG. 8 when a voltage is applied;
FIG. 10 is a schematic structural diagram of another liquid crystal display device according to the present invention when no voltage is applied;
fig. 11 is a schematic structural view of the liquid crystal display device shown in fig. 10 when a voltage is applied.
Reference numerals:
11-array substrate, 12-color film substrate, 13-liquid crystal;
21-a first polarizer, 22-a first one-half wave plate, 23-a first one-quarter wave plate, 24-a second one-quarter wave plate, 25-a second one-half wave plate, 26-a second polarizer;
31-reflective layer, 32-insulating layer;
41-a first wall-shaped electrode, 41 a-a first connection portion, 42-a second wall-shaped electrode, 42 a-a second connection portion, 411-a wall-shaped projection, 412-an electrode pattern covering the wall-shaped projection;
300-gate line, 301-data line, 303-thin film transistor, 303 a-gate, 303 b-source, 303 c-drain, 304-pixel electrode, 305-common electrode;
600-a gate line, 601-a first data line, 602-a second data line, 603-a first thin film transistor, 603 a-a gate, 603 b-a source, 603 c-a drain, 604-a second thin film transistor, 604 a-a gate, 604 b-a source, 604 c-a drain, 605-a pixel electrode (first pixel electrode) located in a transmissive region, 606-a pixel electrode (second pixel electrode) located in a reflective region, 607-a common electrode.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment,
Referring to fig. 1 to 2, an embodiment of the present invention provides a liquid crystal display device, including: the liquid crystal display panel comprises an array substrate 11, a color film substrate 12 and a liquid crystal 13, wherein the array substrate and the color film substrate are arranged oppositely, and the liquid crystal 13 is positioned between the two substrates.
In the drawings, an array substrate 11 provides an array substrate having a novel electrode structure capable of generating a horizontal electric field for an embodiment of the present invention, where the array substrate 11 includes: the base substrate, as shown in fig. 3, further includes: a pixel electrode 304 and a common electrode 305 located inside the substrate in the pixel region; the pixel electrode 304 includes a plurality of electrically connected first wall-shaped electrodes 41, the common electrode 305 includes a plurality of electrically connected second wall-shaped electrodes 42, and the first wall-shaped electrodes 41 and the second wall-shaped electrodes 42 are spaced apart from each other.
In order to apply a voltage to the pixel electrode 304 and the common electrode 305, as shown in fig. 3, the array substrate 11 further includes: a gate line 300 and a data line 301 arranged crosswise, a common electrode line (not shown), and a thin film transistor 303. Wherein the common electrode line is electrically connected to the common electrode 305 to apply a voltage to the common electrode 305. The gate electrode 303a, the source electrode 303b, and the drain electrode 303c of the thin film transistor 303 are sequentially connected to the gate line 300, the data line 301, and the pixel electrode 304, so that when the voltage of the gate electrode 303a is an on voltage, the data line 301 applies a voltage to the pixel electrode 304.
The wall- shaped electrodes 41, 42 are transparent in order to ensure light transmittance of the liquid crystal display device. In addition, in order to visually depict the shape of the electrode in the present invention and to distinguish it from the strip-shaped electrode in the prior art, "wall-shaped" is used to describe the shape of the electrode. Based on the most common understanding of a "wall," a wall is a shape having a length, thickness, and height, wherein one face used to measure the length and height of the "wall" is referred to as a sidewall. It is worth noting that the height of the "wall" is not negligible. In the embodiment of the present invention, two opposite sidewalls of the wall-shaped electrode are perpendicular to the substrate base plate, respectively, and are flat, so that when power is applied, a horizontal electric field is generated between the first wall-shaped electrode 41 and the second wall-shaped electrode 42 which are adjacent to each other.
The thickness of a "wall" is generally small relative to its length and height, and may or may not be uniform in thickness. However, in the embodiment of the present invention, it is preferable that the two sidewalls of the wall-shaped electrode (the first wall-shaped electrode 41 or the second wall-shaped electrode 42) are parallel, that is, the thickness of the wall-shaped electrode is uniform.
Further preferably, the sidewall of the first wall-shaped electrode 41 is parallel to the sidewall of the second wall-shaped electrode 42 adjacent thereto. In this way, a uniform horizontal electric field is facilitated to be formed.
In addition, the portion for electrically connecting the wall-shaped electrode may have any shape, for example, a wall shape, a bar pattern with a negligible height, or the like, as long as the portion can perform the function of electrical connection. Illustratively, as shown in fig. 3, the pixel electrode 304 in the pixel region includes: first wall electrodes 41 and first connection portions 41a, wherein the first connection portions 41a are used to electrically connect the first wall electrodes 41, and the common electrode 305 in the pixel region includes: second wall-shaped electrodes 42 and second connection portions 42a, wherein the second connection portions 42a are used for electrically connecting the second wall-shaped electrodes 42; in the present invention, the shapes of the first connection portion 41a and the second connection portion 42a are not limited.
The following provides a wall-shaped electrode that is relatively easy to manufacture, the wall-shaped electrode (the first wall-shaped electrode 41 or the second wall-shaped electrode 42) including a wall-shaped protrusion and an electrode pattern covering the wall-shaped protrusion; wherein two opposite side walls of the wall-shaped protrusion are respectively perpendicular to the substrate base plate and are flat. Since the protrusion is wall-shaped, the electrode formed after covering a layer of electrode pattern should also be wall-shaped. Illustratively, as shown in fig. 7, the first wall-shaped electrode 41 includes: a wall-shaped protrusion 411, and an electrode pattern 412 covering the wall-shaped protrusion. The structure of the second wall-shaped electrode 42 is also referred to fig. 7.
The material of the wall-shaped protrusion (the first wall-shaped electrode 41 or the second wall-shaped electrode 42) is a transparent organic material, and may be, for example, a transparent polymer material or a transparent resin material. The material of the electrode pattern is a transparent conductive material, and may be, for example, indium tin oxide ITO.
Accordingly, the portion for electrically connecting the wall-shaped electrodes may also include: a connection protrusion and a connection pattern, wherein the connection protrusion may be the same as a material of the wall-shaped protrusion, and the connection pattern may be the same as a material of the electrode pattern. It should be noted that the portion for electrically connecting the wall-shaped electrodes may not include the connecting projection, but may be formed of only the connecting pattern to perform the electrical connection.
The array substrate can be applied to transmission type, reflection type and transflective type liquid crystal display devices. If the liquid crystal display device is applied to a transmission type liquid crystal display device, the liquid crystal display device is also provided with a backlight source at the outer side of the array substrate; if the reflective liquid crystal display device is applied to the reflective liquid crystal display device, a reflective layer is required to be formed on the array substrate; next, an array substrate applied to a transflective liquid crystal display device will be described in detail.
The array substrate applied to the transflective liquid crystal display device comprises a pixel region and a pixel region, wherein the pixel region comprises: a transmissive region and a reflective region; and the array substrate 11 further includes: a reflective layer 31 disposed in the reflective region. In the liquid crystal display device using the array substrate 11, the phase retardation amounts generated when the light rays of the transmission region and the reflection region of the same pixel region pass through the liquid crystal layer are necessarily the same; in addition, in order to simplify the manufacturing process, in the embodiment of the present invention, it is preferable to apply the array substrate to a transflective liquid crystal display device with a single cell thickness, and thus, it is necessary to generate a large phase retardation in the liquid crystal in the transmissive region and a small phase retardation in the liquid crystal in the reflective region.
For this purpose, the pixel electrode in the transmissive region and the pixel electrode in the reflective region are connected on the array substrate, that is, only one pixel electrode 304 is located in one pixel region, and the distance d1 between adjacent wall-shaped electrodes in the transmissive region is smaller than the distance d2 between adjacent wall-shaped electrodes in the reflective region. This makes the voltages of the pixel electrodes in the transmissive area and the reflective area in one pixel area uniform when the power is applied, and since the voltage of the common electrode 305 is generally constant according to the common knowledge in the art, the electric field intensity becomes stronger when the pitch is smaller, that is, the transmissive area of the same pixel area generates a stronger electric field intensity and the reflective area generates a weaker electric field intensity.
In order to ensure that the transflective liquid crystal display device is single-cell thick, the array substrate 11 further includes: an insulating layer 32 disposed on the reflective layer 31, the insulating layer 32 extending to both the transmissive region and the reflective region; the thickness of the insulating layer 32 in the transmission region is greater than that of the insulating layer 32 in the reflection region, and the difference between the thicknesses of the two regions of the insulating layer is the thickness of the reflection layer; this makes it possible to make the thickness of the liquid crystal layer uniform in the reflective area and the transmissive area.
The liquid crystal display device provided by the embodiment of the invention can comprise any one of the array substrates. The liquid crystal display device can be a product or a component with any display function, such as a liquid crystal display, a liquid crystal television, a digital photo frame, a mobile phone, a tablet personal computer and the like.
Optionally, the top end of the first wall-shaped electrode 41 and/or the second wall-shaped electrode 42 is in contact with the inner side of the color filter substrate 12. Therefore, the wall-shaped electrode can play a supporting role, and a step of arranging a spacer between the color film substrate 12 and the array substrate 11 can be omitted. In the figure, the top ends of the first wall-shaped electrode 41 and the second wall-shaped electrode 42 are both in contact with the inner side of the color filter substrate 12 as an example.
The liquid crystal 13 in the liquid crystal display device may be any liquid crystal that can be driven by a horizontal electric field, and since the blue phase liquid crystal display has the advantages of large viewing angle, good dark state, short response time, and the like, the liquid crystal 13 is preferably a blue phase liquid crystal in the embodiment of the present invention. Blue phase liquid crystals are also exemplified in all the drawings.
The characteristics of the blue phase liquid crystal molecules are as follows: when no voltage is applied, the blue phase liquid crystal molecules have isotropic characteristics; when a voltage is applied, the blue phase liquid crystal molecules have a birefringence characteristic in one direction, and the blue phase liquid crystal molecules are aligned in the direction of the electric field. Due to such characteristics of the blue phase liquid crystal molecules, the liquid crystal display device is driven by the horizontal electric field generated by the pixel electrode and the common electrode in the embodiment of the present invention.
Further, the liquid crystal display device further includes: a first quarter-wave plate 23, a first half-wave plate 22, and a first polarizing plate 21 disposed outside the array substrate 11; and the second quarter-wave plate 24, the second half-wave plate 25 and the second polarizer 26 are arranged on the outer side of the color film substrate 12.
Illustratively, a first quarter-wave plate 23, a first half-wave plate 22 and a first polarizer 21 are arranged on the outer side of the array substrate 11 in sequence from inside to outside; a second quarter-wave plate 24, a second half-wave plate 25 and a second polarizer 26 are sequentially disposed on the outer side of the color film substrate 12 from inside to outside.
In the above-described array substrate for transflective liquid crystal display device, the distance d1 between the adjacent wall-shaped electrodes in the transmissive region is smaller than the distance d2 between the adjacent wall-shaped electrodes in the reflective region, and the proportional relationship between the two is determined according to the properties (e.g., birefringence, dielectric anisotropy, and Kerr constant) of the blue phase liquid crystal. Specifically, the proportional relationship between the two pitches can be determined for a device containing a specific blue phase liquid crystal according to the following test method: first, different test devices were manufactured according to several preset pitch ratios, and each of the test devices was filled with the specific one of the blue phase liquid crystals. Secondly, drawing V-T (voltage-transmittance) curve characteristics of the transmission area and the reflection area of the testing devices, and if the curve characteristics of the transmission area and the reflection area of one testing device are consistent in an error range, indicating that the phase delay of the transmission area is approximately 2 times of the phase delay of the reflection area, and then the proportional relation of the testing device can be used as a reference value in actual production. In the embodiment of the present invention, the ratio is not limited, but the phase retardation amounts generated when the light rays in the transmissive region and the reflective region of the same pixel region pass through the liquid crystal layer in actual production are the same.
Next, how to realize transflective display in the transflective liquid crystal display device described above will be described in detail.
Fig. 1 is a schematic structural diagram of a liquid crystal display device when not powered. When no voltage is applied, the blue phase liquid crystal molecules are isotropic, and the light rays of the transmission region and the reflection region do not generate phase retardation through the isotropic liquid crystal 13, and if the polarization directions of the first polarizing plate 21 and the second polarizing plate 26 form an included angle of 90 degrees, the emergent light rays are completely blocked by the second polarizing plate 26, so that dark state display is realized.
FIG. 2 is a schematic diagram of a liquid crystal display device when it is powered on. The blue phase liquid crystal molecules generate phase delay in the horizontal direction under the action of a horizontal electric field, the distance d1 between the adjacent wall-shaped electrodes in the transmission area is different from the distance d2 between the adjacent wall-shaped electrodes in the reflection area, and d1 is less than d 2. Since the distance d1 between adjacent wall-shaped electrodes in the transmissive region is small, a strong electric field strength is generated, and thus the blue-phase liquid crystal molecules generate a large phase delay Δ n1 under the action of a strong electric field. On the contrary, the larger distance d2 between the adjacent wall-shaped electrodes in the reflective region generates a weaker electric field strength, so that the blue-phase liquid crystal molecules generate a smaller phase delay Δ n2 under the action of the weaker electric field. Because of the reflection of the reflective layer 31, the light in the reflective region passes through the liquid crystal layer twice, so the propagation distance D2 of the light in the reflective region through the liquid crystal layer is about 2 times the propagation distance D1 of the light in the transmissive region through the liquid crystal layer, i.e., approximately D2 is 2 × D1; therefore, the distances D1 and D2 between the adjacent wall-shaped electrodes in the transmissive region and the reflective region can be optimized, so that the phase retardation amounts generated by the light rays in the transmissive region and the reflective region in the same pixel region passing through the liquid crystal layer are the same, namely Δ n1 × D1 ═ Δ n2 × D2, and the transflective display effect can be achieved.
Similarly, the transmissive liquid crystal display device and the reflective liquid crystal display device provided in the embodiments of the present invention can also realize a normal display function.
The array substrate and the liquid crystal display device provided by the invention have the advantages that the pixel electrode comprising a plurality of electrically connected first wall-shaped electrodes and the common electrode comprising a plurality of electrically connected second wall-shaped electrodes are arranged on the array substrate, wherein the first wall-shaped electrodes and the second wall-shaped electrodes are arranged at intervals; the electrodes are designed into the wall-shaped structure with the two flat side walls, so that when the liquid crystal display device is electrified, the two electrodes are both surface electrodes, a horizontal electric field can be generated between the adjacent first wall-shaped electrode and the second wall-shaped electrode, and the liquid crystal display device can realize the display function under the action of the horizontal electric field.
Example II,
Referring to fig. 4 to 5, an embodiment of the invention provides an array substrate and a liquid crystal display device. The second embodiment is different from the first embodiment only in that when the second embodiment is applied to a transflective liquid crystal display device, the electrode structure disposed on the array substrate and the manner of applying a voltage to the electrode are different, so that only the difference points are described in detail in the first embodiment, and all the other points can be referred to the description in the first embodiment.
The array substrate 11 applied to the transflective liquid crystal display device includes: a transmissive region and a reflective region; and the array substrate further includes: a reflective layer 31 disposed in the reflective region. The liquid crystal display device using the array substrate can ensure that the phase delay quantity generated by the light rays of the transmission area and the reflection area of the same pixel area passing through the liquid crystal layer is the same; in addition, in order to simplify the manufacturing process, it is preferable to apply the array substrate to a liquid crystal display device with a single cell thickness in the embodiment of the present invention, and thus, the liquid crystal in the transmissive region needs to generate a large phase retardation, and the liquid crystal in the reflective region needs to generate a small phase retardation.
For this purpose, as shown in fig. 6, the pixel electrode 605 located in the transmissive region and the pixel electrode 606 located in the reflective region are not connected, that is, two pixel electrodes, namely, a first pixel electrode 605 located in the transmissive region and a second pixel electrode 606 located in the reflective region, are disposed in one pixel region on the array substrate 11. And, the distance d1 between the adjacent wall electrodes in the transmissive region is equal to the distance d2 between the adjacent wall electrodes in the reflective region, and when the pixel electrode (first pixel electrode) 605 in the transmissive region and the common electrode 607 are energized, the voltage difference between the pixel electrode (second pixel electrode) 606 in the reflective region and the common electrode 607 is greater.
Referring to fig. 6, a detailed description will be given of how to apply voltages to the pixel electrode and the common electrode. The array substrate 11 further includes: a gate line 600, a first data line 601, a second data line 602, a common electrode line (not shown), and a first thin film transistor 603 and a second thin film transistor 604 in the pixel region; a first voltage is applied to the first pixel electrode 605 through the first thin film transistor 603 by the first data line 601, a second voltage is applied to the second pixel electrode 606 through the second thin film transistor 604 by the second data line 602, and the first voltage and the second voltage are not equal.
Specifically, the gate electrode 603a, the source electrode 603b, and the drain electrode 603c of the first thin film transistor 603 are sequentially and respectively electrically connected to the gate line 600, the first data line 601, and the first pixel electrode 605, and the gate electrode 604a, the source electrode 604b, and the drain electrode 604c of the second thin film transistor 604 are sequentially and respectively electrically connected to the gate line 600, the second data line 602, and the second pixel electrode 606. Thus, when the gates 603a and 604a are turned on, the first data line 601 may apply a first voltage to the first pixel electrode 605, and the second data line 602 may apply a second voltage to the second pixel electrode 606, where the first voltage is not equal to the second voltage, so that a voltage difference between the first pixel electrode 605 and the common electrode 607 is greater than a voltage difference between the second pixel electrode 606 and the common electrode 607. Preferably, the first data line 601 and the second data line 602 are disposed at both sides of the pixel region.
In the above-described array substrate, different voltages are applied to the first pixel electrode 605 and the second pixel electrode 606 from the first data line 601 and the second data line 602, respectively, when the power is turned on, and the determination of the voltage value applied to the two pixel electrodes is related to the properties (such as birefringence property, dielectric anisotropy property, and kerr constant) of the blue phase liquid crystal. Specifically, the proportional relationship between two voltage values can be determined for a device containing a specific blue phase liquid crystal according to the following test method: first, a test apparatus filled with the specific blue phase liquid crystal was manufactured in advance. Next, a voltage is applied to the first pixel electrode 605 of the transmissive region through the first data line 601, a voltage is applied to the second pixel electrode 606 of the reflective region through the second data line 602, V-T (voltage-transmittance) curve characteristics of the transmissive region and the reflective region of the test apparatus are respectively plotted, the curve characteristics of the two regions are analyzed, and voltage values of the first and second data lines corresponding to positions where the transmittances are the same are sequentially obtained. In the embodiment of the present invention, the voltage values applied to the two pixel electrodes are not limited, so that in actual production, the phase retardation amounts generated when the light rays in the transmission region and the reflection region of the same pixel region pass through the blue phase liquid crystal layer are the same; however, the voltage difference between the first pixel electrode 605 and the common electrode 607 in the same pixel region must be greater than the voltage difference between the second pixel electrode 606 and the common electrode 607, so that the same phase retardation in the transmissive region and the reflective region is provided.
The embodiment of the invention provides a liquid crystal display device which can comprise any one of the array substrates. The liquid crystal display device can be a product or a component with any display function, such as a liquid crystal display, a liquid crystal television, a digital photo frame, a mobile phone, a tablet personal computer and the like.
Next, how to realize transflective display in the transflective liquid crystal display device including the array substrate is described in detail.
Fig. 4 is a schematic structural diagram of the liquid crystal display device when not powered. When no voltage is applied, the blue phase liquid crystal molecules are isotropic, and the light rays of the transmission region and the reflection region do not generate phase retardation amount when passing through the isotropic blue phase liquid crystal, if the polarization directions of the first polarizing plate 21 and the second polarizing plate 26 form an included angle of 90 degrees, the emergent light rays are completely blocked by the second polarizing plate 26, so that dark state display is realized.
FIG. 5 is a schematic diagram of the structure of the LCD device when it is powered on. The blue phase liquid crystal molecules generate phase retardation in the horizontal direction under the action of the horizontal electric field, the distance d1 between the adjacent wall-shaped electrodes in the transmission region is the same as the distance d2 between the adjacent wall-shaped electrodes in the reflection region, and d1 is equal to d2, so that the influence of the distance between the adjacent wall-shaped electrodes in the transmission region and the reflection region on the generated horizontal electric field is not considered, and the influence of different voltages applied to the first pixel electrode 605 in the transmission region and the second pixel electrode 606 in the reflection region on the electric field is utilized. By applying different voltages to the first pixel electrode 605 and the second pixel electrode 606, the voltage difference between the first pixel electrode 605 and the common electrode 607 in the same pixel region is larger than the voltage difference between the second pixel electrode 606 and the common electrode 607, and the larger the voltage difference, the stronger the generated electric field, the stronger the electric field strength in the transmission region, the larger the phase delay Δ n1 in the blue phase liquid crystal molecules under the action of the stronger electric field, the weaker the electric field strength in the reflection region, and the smaller the phase delay Δ n2 in the blue phase liquid crystal molecules under the action of the weaker electric field. Due to the existence of the reflective layer 31, the light in the reflective region passes through the liquid crystal layer twice, so the propagation distance D2 of the light in the reflective region through the liquid crystal layer is about 2 times of the propagation distance D1 of the light in the transmissive region through the liquid crystal layer, i.e., approximately D2 is 2 × D1; therefore, by applying different voltages to the first pixel electrode and the second pixel electrode, the phase retardation amounts generated by the light rays in the transmission region and the reflection region of the same pixel region passing through the liquid crystal layer are the same, namely Δ n1 × D1 ═ Δ n2 × D2, so as to achieve the transflective display effect.
According to the array substrate and the liquid crystal display device provided by the embodiment of the invention, the pixel electrode comprising a plurality of electrically connected first wall-shaped electrodes and the common electrode comprising a plurality of electrically connected second wall-shaped electrodes are arranged on the array substrate, wherein the first wall-shaped electrodes and the second wall-shaped electrodes are arranged at intervals; because the electrodes are designed into the wall-shaped structure with two flat side walls, when the liquid crystal display device is electrified, the two electrodes are both surface electrodes, so that a horizontal electric field can be generated between the adjacent first wall-shaped electrode and the second wall-shaped electrode, and the liquid crystal display device can realize the display function under the action of the horizontal electric field; and different voltages are applied to the pixel electrode positioned in the transmission area and the pixel electrode positioned in the reflection area, so that the phase delay amount of light passing through the transmission area and the reflection area is the same, and the transflective display effect is achieved.
Example III,
Referring to fig. 8 to 9, an embodiment of the invention provides a liquid crystal display device. The third embodiment is different from the first embodiment only in that the heights of the wall-shaped electrodes are different, so that only the differences are described in detail in the first embodiment, and all others can be referred to the description of the first embodiment.
In the liquid crystal display device provided in the embodiment of the present invention, a gap is left between the top ends of the first wall-shaped electrode 41 and the second wall-shaped electrode 42 and the inner side of the color film substrate 12, so that the mobility of the liquid crystal in the liquid crystal display device can be enhanced. At this time, a spacer can be arranged between the color film substrate and the array substrate, and the thickness of the liquid crystal box is ensured through the spacer.
Example four,
Referring to fig. 10 to 11, an embodiment of the invention provides a liquid crystal display device. The difference between the fourth embodiment and the second embodiment is only that the heights of the wall-shaped electrodes are different, so that only the difference points are described in detail in the present embodiment, and all the other points can be referred to the description in the second embodiment.
In the liquid crystal display device provided in the embodiment of the present invention, a gap is left between the top ends of the first wall-shaped electrode 41 and the second wall-shaped electrode 42 and the inner side of the color film substrate 12, so that the mobility of the liquid crystal in the liquid crystal display device can be enhanced. At this time, a spacer can be arranged between the color film substrate and the array substrate, and the thickness of the liquid crystal box is ensured through the spacer.
Example V,
The embodiment of the invention provides a manufacturing method of an array substrate, which comprises the following steps:
step 1, manufacturing a transparent organic material film on a substrate base plate at least provided with a gate metal layer and a source drain metal layer, and forming a plurality of wall-shaped bulges by utilizing a composition process.
Two opposite side walls of the wall-shaped bulge are perpendicular to the substrate base plate and are flat; the gate metal layer includes: a gate line, a gate electrode of a thin film transistor; the source drain metal layer includes: the data line, the source electrode of the thin film transistor and the drain electrode of the thin film transistor. In addition, the transparent organic material may be a transparent polymer material, or a transparent resin material.
And 2, manufacturing the transparent conductive film, and forming electrode patterns of the pixel electrode and the common electrode by using a composition process.
The pixel electrode comprises a plurality of electrically connected first wall-shaped electrodes, the common electrode comprises a plurality of electrically connected second wall-shaped electrodes, the first wall-shaped electrodes and the second wall-shaped electrodes are arranged at intervals, and the wall-shaped electrodes comprise wall-shaped protrusions and electrode patterns covering the wall-shaped protrusions. In addition, the transparent conductive material may be Indium Tin Oxide (ITO) or the like.
For example, the method for manufacturing the array substrate may include:
(1) and spin-coating a transparent organic material on the substrate with at least the gate metal layer and the source-drain metal layer to form a transparent organic material film.
(2) Exposure processing is performed through a mask plate designed in advance.
(3) Removing the unnecessary part of the transparent organic material film by using a developing process, and at least reserving the part of the transparent organic material film as the wall-shaped protrusion;
(4) and curing and aging the formed wall-shaped protrusion to form the wall-shaped protrusion.
(5) And depositing a transparent conductive material to form a transparent conductive film.
(6) Through the patterning process, at least an electrode pattern covering the wall-shaped protrusion and a connection pattern for electrically connecting the wall-shaped electrode are formed.
The manufacturing method of the array substrate provided by the embodiment of the invention comprises the steps that a pixel electrode comprising a plurality of electrically connected first wall-shaped electrodes and a common electrode comprising a plurality of electrically connected second wall-shaped electrodes are arranged, wherein the first wall-shaped electrodes and the second wall-shaped electrodes are arranged at intervals; the electrodes are designed into the wall-shaped structure with the two flat side walls, so that when the liquid crystal display device is electrified, the two electrodes are both surface electrodes, a horizontal electric field can be generated between the adjacent first wall-shaped electrode and the second wall-shaped electrode, and the liquid crystal display device can realize the display function under the action of the horizontal electric field.
In addition, it should be noted that, in order to clearly describe the structure to be protected by the present invention, the structure irrelevant to the present invention is simplified or omitted in each embodiment and the drawings, and the structure simplified or omitted in each embodiment and the drawings is easily obtained by those skilled in the art without creative work, so that the detailed description is not repeated in this embodiment.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (11)
1. An array substrate, comprising: the substrate comprises a substrate base plate, a pixel electrode and a common electrode, wherein the pixel electrode and the common electrode are positioned at the inner side of the substrate base plate and in a pixel area; the pixel electrode comprises a plurality of electrically connected first wall-shaped electrodes, the common electrode comprises a plurality of electrically connected second wall-shaped electrodes, and the first wall-shaped electrodes and the second wall-shaped electrodes are arranged at intervals; the wall-shaped electrode is transparent, two opposite side walls of the wall-shaped electrode are respectively perpendicular to the substrate base plate and are flat, and therefore when the substrate base plate is electrified, a horizontal electric field is generated between the first wall-shaped electrode and the second wall-shaped electrode which are adjacent to each other.
2. The array substrate of claim 1, wherein the two sidewalls of the wall-shaped electrode are parallel.
3. The array substrate of claim 1, wherein the sidewalls of the first wall-shaped electrode are parallel to the sidewalls of the second wall-shaped electrode adjacent to the first wall-shaped electrode.
4. The array substrate of claim 3, wherein the pixel region comprises: a transmissive region and a reflective region; the array substrate further includes: a reflective layer disposed in the reflective region;
the pixel electrode positioned in the transmission area is connected with the pixel electrode positioned in the reflection area, and the distance between the adjacent wall-shaped electrodes positioned in the transmission area is smaller than that between the adjacent wall-shaped electrodes positioned in the reflection area; or,
the pixel electrode located in the transmission area is not connected with the pixel electrode located in the reflection area, the distance between the adjacent wall-shaped electrodes located in the transmission area is equal to the distance between the adjacent wall-shaped electrodes located in the reflection area, and when the LED is electrified, the voltage difference between the pixel electrode located in the transmission area and the common electrode is larger than the voltage difference between the pixel electrode located in the reflection area and the common electrode.
5. The array substrate of claim 4, further comprising: an insulating layer disposed on the reflective layer, the insulating layer extending over both the transmissive region and the reflective region;
the thickness of the insulating layer in the transmission area is larger than that of the insulating layer in the reflection area, and the difference between the thicknesses of the insulating layer in the two areas is the thickness of the reflection layer.
6. The array substrate of any one of claims 1 to 5, wherein the wall-shaped electrode comprises a wall-shaped protrusion and an electrode pattern covering the wall-shaped protrusion; the two opposite side walls of the wall-shaped protrusion are respectively perpendicular to the substrate base plate and are flat, the wall-shaped protrusion is made of transparent organic materials, and the electrode pattern is made of transparent conductive materials.
7. A liquid crystal display device comprising: the liquid crystal display panel comprises an array substrate, a color film substrate and a liquid crystal positioned between the two substrates, wherein the array substrate and the color film substrate are arranged oppositely, and the liquid crystal is positioned between the two substrates, and is characterized in that the array substrate is the array substrate of any one of claims 1 to 6.
8. The liquid crystal display device according to claim 7, wherein top ends of the first and/or second wall-shaped electrodes are in contact with an inner side of the color filter substrate; or a gap is reserved between the top ends of the first wall-shaped electrode and the second wall-shaped electrode and the inner side of the color film substrate.
9. The liquid crystal display device according to claim 7 or 8, wherein the liquid crystal is a blue phase liquid crystal.
10. The liquid crystal display device according to claim 7 or 8, further comprising: the first quarter-wave plate, the first half-wave plate and the first polaroid are arranged on the outer side of the array substrate; and the second quarter-wave plate, the second half-wave plate and the second polaroid are arranged on the outer side of the color film substrate.
11. A method for manufacturing an array substrate includes:
manufacturing a transparent organic material film on a substrate base plate at least provided with a gate metal layer and a source drain metal layer, and forming a plurality of wall-shaped bulges by utilizing a composition process; two opposite side walls of the wall-shaped bulge are perpendicular to the substrate base plate and are flat; the gate metal layer includes: a gate line, a gate electrode of a thin film transistor; the source drain metal layer includes: the data line, the source electrode of the thin film transistor and the drain electrode of the thin film transistor;
manufacturing a transparent conductive film, and forming electrode patterns of a pixel electrode and a common electrode by using a composition process; the pixel electrode comprises a plurality of electrically connected first wall-shaped electrodes, the common electrode comprises a plurality of electrically connected second wall-shaped electrodes, the first wall-shaped electrodes and the second wall-shaped electrodes are arranged at intervals, and the wall-shaped electrodes comprise wall-shaped protrusions and electrode patterns covering the wall-shaped protrusions.
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