TWI465818B - Blue phase liquid crystal display panel - Google Patents

Description

Blue phase liquid crystal display panel

The present invention relates to a liquid crystal display panel, and more particularly to a blue phase liquid crystal display panel.

In 1888, Friedrich Reinitzer placed Cholesteric benzoate in a polarizing microscope and observed that cholesteric benzoate appeared in different colors in the Isotropic and Cholesteric phases (blue). Purple and blue), the color change between the homogeneous phase and the cholesterol phase exists only in a small temperature range (about 1 ° C temperature range). In 1970, many scientists used volumetric analysis, high-resolution differential scanning calorimetry, and other methods to confirm that the aforementioned phenomenon is a new thermodynamically stable phase, which is called the blue phase.

The blue phase has three different phases, which are represented by BP I, BP II, BP III, and the temperature of BP III is the highest among the three phases. The BP III mentioned in the literature is the "fog phase". (fog phase). Compared to the cubic structure of BP I and BP II, BP III is amorphous. Observed under a polarizing microscope, BP III is usually a blurred image without any structure, so it is difficult to observe under a polarizing microscope.

The structure of BP I and BP II has been confirmed, and the basic unit constituting BP I and BP II is a "double twist cylinder" (DTC), and this arrangement has the smallest free energy. In addition, the arrangement of the double-twisted cylindrical tubes in the space is perpendicular to each other, and such an arrangement results in a defect. The crystal lattice is also considered to be a pre-transitional phenomenon in which the liquid crystal phase enters the cholesterol phase. Therefore, the blue phase is classified as a frustrated phase. Experimental studies using Bragg scattering, Kossel diagram, optical organization, crystal growth, etc., found that BP II is a simple cubic structure (SC: simple cubic) (Mol.Cryst.Liq.Cryst., Vol .465, pp. 283-288, 2007), BP I is a body-centered cubic structure (BCC). Unlike other liquid crystal phases, such as nematic, smectic, and isotropic, BP I and BP II usually display a number of platelet textures under a polarizing microscope ( JACS, 2008, 130, 6326 Kikuchi et. al.), because the lattice period causes Bragg reflection in the visible wavelength range.

A typical liquid crystal is optically anisotropic, but the blue phase is optically isotropic. In other words, the blue phase has very low or even no birefringence.

Since the lattice period of the blue phase is a function of the wavelength of visible light, selective "selective Bragg reflection" is produced. This property allows blue phase liquid crystals to be used in fast light modulators. However, no matter in theoretical prediction or experimental observation, blue phase liquid crystal only appears in molecular materials with high purity and high optical rotation, so blue phase liquid crystal exists only in a small temperature range (less than 2). °C temperature range). Therefore, blue phase liquid crystals are usually only discussed academically, but they have not received much attention in practical applications.

In the past ten years, in order to make the display quality of liquid crystal display panels superior to the display quality of cathode ray tubes, the blue phase with fast response characteristics has received attention from both academic and industrial circles. In order to meet the needs of the application, blue phase liquid crystals must have a wide range of temperature applications, so different technological developments have been proposed. For example, a polymer-stabilized property (generating a polymer network structure) is utilized to produce a blue phase that can exist in a wide temperature range (Nature materials, 2002, 1, 64). In addition, in 2002, Kikuchi et al. added a small amount of molecular monomer and photoresist to the blue phase liquid crystal, and produced a stable blue phase such as a gel structure in the blue phase temperature range, successfully producing a temperature interval of about It is a blue phase of 60 °C.

1 is a partial schematic view of a conventional blue phase liquid crystal display panel. Referring to FIG. 1 , the conventional blue phase liquid crystal display panel 50 is provided with a pixel unit 54 of an In-Plane Switching (IPS) on the lower substrate 52. Each pixel unit 54 has a pixel electrode 54a and a common electrode 54b electrically insulated from each other, wherein the pixel electrode 54a has a plurality of strip patterns SP1 connected to each other, and the common electrode 54b also has a plurality of strips connected to each other. Pattern SP2. The strip pattern SP1 and the strip pattern SP2 are alternately arranged and substantially parallel to each other. Therefore, an electric field E can be generated between the stripe pattern SP1 of the pixel electrode 54a and the stripe pattern SP2 of the adjacent common electrode 54b to change the orientation of the liquid crystal molecules in the pixel unit 54.

Figure 2 is a schematic illustration of the pixel unit of Figure 1 being opened. Referring to FIG. 2, when an appropriate voltage is applied to the pixel electrode 54a and the common electrode 54b to generate an electric field E between the stripe pattern SP1 of the pixel electrode 54a and the stripe pattern SP2 of the common electrode 54b, the strip pattern SP1 and strip pattern The area between SP2 is the bright area B, and the area occupied by the strip pattern SP1 and the strip pattern SP2 is the dark area D. For example, when the strip patterns SP1, SP2 have a width of 3 μm and the pitch between the strip pattern SP1 and the adjacent strip pattern SP2 is 3 μm, the bright area B of the blue phase liquid crystal display panel 50 is The area ratio of the dark area D is about 1:1.

Although blue phase liquid crystal has the advantages of fast response time and optical isotropicity, it has the disadvantage of high driving voltage, and its driving voltage usually needs to be as high as 55 volts. Further, in the blue phase liquid crystal display panel having the planar conversion type pixel unit, the area occupied by the strip pattern is the dark area D, so that the transmittance of the blue phase liquid crystal display panel is not good.

In view of the above, the high driving voltage and low transmittance of the blue phase liquid crystal display panel are one of the problems to be solved.

The invention provides a blue phase liquid crystal display panel with a lower driving voltage and a higher transmittance.

The present invention provides a blue phase liquid crystal display panel comprising a first substrate, a plurality of first pixels, a second substrate, a plurality of second pixels, and a blue phase liquid crystal layer. The first pixel array is arranged on the first substrate. Each of the first pixels includes a first electrode electrically insulated from each other and a second electrode, wherein the first electrode has a plurality of first strip patterns connected to each other, and the second electrode has a plurality of second strips connected to each other The pattern, the first strip pattern and the second strip pattern are alternately arranged, and the first strip pattern is substantially parallel to the second strip pattern. The second substrate is disposed opposite to the first substrate. The second pixel array is arranged in On the second substrate. Each of the second pixels includes a third electrode electrically insulated from each other and a fourth electrode, wherein the third electrode has a plurality of third strip patterns connected to each other, and the fourth electrode has a plurality of fourth strips connected to each other The pattern, the third strip pattern and the fourth strip pattern are alternately arranged, and the third strip pattern is substantially parallel to the fourth strip pattern, and the first strip pattern is staggered and substantially perpendicular to the third strip pattern. The blue phase liquid crystal layer is disposed between the first pixel and the second pixel.

In an embodiment of the invention, each of the first pixels further includes a first switching element electrically connected to the first electrode, and each of the second pixels further includes a first electrical connection with the third electrode. And a second switching element, wherein each of the second electrodes and each of the fourth electrodes are electrically coupled to a common voltage.

In an embodiment of the invention, the first strip pattern is interlaced with the fourth strip pattern, and the second strip pattern is interlaced with the third strip pattern, and the second strip pattern and the fourth strip pattern are staggered.

In an embodiment of the invention, a first transverse electric field is generated between each of the first strip patterns and the adjacent second strip pattern, and each of the third strip patterns and the adjacent fourth strip pattern A second transverse electric field is generated between the patterns, and the first transverse electric field is different from the second transverse electric field.

In an embodiment of the invention, the intersection of the first strip pattern and the third strip pattern, the intersection of the first strip pattern and the fourth strip pattern, the second strip pattern and the third strip The staggered pattern and the intersection of the second strip pattern and the fourth strip pattern are defined as a plurality of dark regions separated from each other, and in the first strip pattern, the second strip pattern, In the region where the three strip patterns and the fourth strip pattern are distributed, a portion other than the dark region is defined as a plurality of bright regions separated from each other, The regions in which the first stripe pattern, the second stripe pattern, the third stripe pattern, and the fourth stripe pattern are not distributed are defined as translucent regions.

In an embodiment of the invention, the first strip pattern is substantially perpendicular to the third strip pattern.

In an embodiment of the invention, the first strip pattern is substantially perpendicular to the fourth strip pattern, and the second strip pattern is substantially perpendicular to the third strip pattern, and the second strip pattern is substantially Vertical to the fourth strip pattern.

In an embodiment of the invention, a first transverse electric field is generated between each of the first strip patterns and the adjacent second strip pattern, and each of the third strip patterns and the adjacent fourth strip pattern A second transverse electric field is created between the patterns, and the first transverse electric field is substantially perpendicular to the second transverse electric field.

Based on the above, the present invention provides a blue phase liquid crystal display panel in which a first pixel and a second pixel are respectively disposed on two oppositely disposed substrates. The first pixel and the second pixel respectively have a plurality of electrodes alternately arranged and parallel to each other, wherein the first pixel is interlaced with the electrode pattern of the second pixel, and the blue phase liquid crystal layer is disposed on the first pixel and the first pixel Between two pixels. Accordingly, the blue phase liquid crystal display panel has a lower driving voltage and a higher transmittance.

The above described features and advantages of the present invention will be more apparent from the following description.

3 is a cross-sectional view showing a blue phase liquid crystal display panel according to an embodiment of the present invention. 4 is the blue phase liquid crystal display panel of FIG. 3 in the first pixel and the second pixel A partial schematic of the pixel. Referring to FIG. 3 and FIG. 4 , in the embodiment, the blue phase liquid crystal display panel 100 includes a first substrate 110 , a plurality of first pixels 120 , a second substrate 130 , a plurality of second pixels 140 , and a blue phase liquid crystal. Layer 150. The first substrate 110 is disposed opposite to the second substrate 130. The first pixel 120 array is arranged on the first substrate 110, and the second pixel 140 array is arranged on the second substrate 130. The blue phase liquid crystal layer 150 is disposed between the first pixel 120 and the second pixel 140. In other words, the blue phase liquid crystal layer 150 is located between the first substrate 110 and the second substrate 130 disposed opposite to each other, and the first pixel 120 and the second pixel 140 are located inside the first substrate 110 and the second substrate 130, respectively. .

In detail, in the embodiment, each of the first pixels 120 includes a first electrode 122 and a second electrode 124 that are electrically insulated from each other. The first electrode 122 has a plurality of first strip patterns P1 connected to each other, and the second electrode 124 also has a plurality of second strip patterns P2 connected to each other. The first stripe pattern P1 is arranged in parallel and connected to each other, and the second stripe pattern P2 is arranged in parallel and connected to each other. The first stripe pattern P1 and the second stripe pattern P2 are alternately arranged, and the first stripe pattern P1 is substantially parallel to the second stripe pattern P2. Therefore, the first electrode 122 and the second electrode 124 can be regarded as different finger electrode patterns, and the finger electrode patterns are staggered from each other as shown in FIG.

Referring to FIG. 3 , in the embodiment, each of the first pixels 120 further includes at least one first switching element 126 . In the present embodiment, the first switching element 126 is, for example, a bottom gate type transistor (TFT), but the invention is not limited thereto, and a top gate type transistor can also be used. The first electrode 122 is electrically connected to the first switching element 126, and the first switching element 126 is connected to the pair The respective signal lines are, for example, scan lines and data lines, to further control whether voltage information of each signal line is written into the first electrode 122. On the other hand, the second electrode 124 is electrically coupled to the common voltage V. Therefore, when the first electrode 122 and the second electrode 124 are respectively applied with appropriate voltages, the first pixel 120 is turned on to generate a first lateral electric field E1 between the first strip pattern P1 and the second strip pattern P2. .

In detail, when the first switching element 126 is turned on to write voltage information to the first electrode 122, the first electrode 122 is applied with a voltage, and its voltage value is different from the voltage value of the common voltage V, so that the first electrode There is a voltage difference between the 122 and the second electrode 124. At this time, a first transverse electric field E1 is generated between the first stripe pattern P1 and the adjacent second stripe pattern P2 via a voltage difference to change the arrangement of the liquid crystal molecules in the first pixel 120.

Specifically, referring to FIG. 5, a first lateral electric field E1 is generated between each of the first stripe patterns P1 and the adjacent second stripe pattern P2, such that each of the first stripe patterns P1 and the adjacent second strips The area between the pattern P2 is the bright area BR1. On the other hand, the region occupied by each of the first stripe pattern P1 and each of the second stripe patterns P2 does not have the first lateral electric field E1. Therefore, the area occupied by each of the first stripe pattern P1 and each of the second stripe patterns P2 is the dark area DR1.

In this embodiment, each of the first stripe patterns P1 is the same as the width L1 of each of the second stripe patterns P2, and each of the first stripe patterns P1 is the same as the pitch S1 of the adjacent second stripe patterns P2, and The ratio of the width L1 to the pitch S1 is, for example, about 3:4, that is, the ratio of the area of the bright area BR1 to the dark area DR1 is, for example, about 4:3. However, in other embodiments, the width L1 and spacing The ratio of S1 may be, for example, about 3:3 or 3:5, and the invention is not limited thereto.

On the other hand, in the embodiment, preferably, each of the second pixels 140 includes a third electrode 142 and a fourth electrode 144 that are electrically insulated from each other. The third electrode 142 has a plurality of third strip patterns P3 connected to each other, and the fourth electrode 144 also has a plurality of fourth strip patterns P4 connected to each other. The third stripe pattern P3 is arranged in parallel and connected to each other, and the fourth stripe pattern P4 is arranged in parallel and connected to each other. The third stripe pattern P3 and the fourth stripe pattern P4 are alternately arranged, and the third stripe pattern P3 is substantially parallel to the fourth stripe pattern P4. Therefore, the third electrode 142 and the fourth electrode 144 can be regarded as different finger electrode patterns, and the finger electrode patterns are staggered from each other as shown in FIG.

It should be noted that, in this embodiment, when the first pixel 120 and the second pixel 140 are arrayed on the first substrate 110 and the second substrate 130, respectively, the first substrate 110 and the second substrate 130 are perpendicular. From the perspective of the view, the first stripe pattern P1 is interlaced with the third stripe pattern P3. Further, in the present embodiment, the first stripe pattern P1 is substantially perpendicular to the third stripe pattern P3, but the invention is not limited thereto.

Specifically, when the array of the first pixels 120 is arranged on the first substrate 110, the first stripe pattern P1 and the second stripe pattern P2 are respectively arranged in parallel, and the first stripe pattern P1 and the second stripe pattern are respectively arranged. P2 is alternately arranged, and the first stripe pattern P1 is substantially parallel to the second stripe pattern P2. Therefore, the first stripe pattern P1 and the second stripe pattern P2 can be regarded as being arranged along the first direction D1.

On the other hand, when the second pixel 140 array is arranged on the second substrate 130 In the upper case, the third strip pattern P3 and the fourth strip pattern P4 are respectively arranged in parallel, and the third strip pattern P3 and the fourth strip pattern P4 are alternately arranged, and the third strip pattern P3 is substantially parallel to the fourth Strip pattern P4. Therefore, the third stripe pattern P3 and the fourth stripe pattern P4 can be regarded as being arranged along the second direction D2.

In the embodiment, the first stripe pattern P1 is interlaced with the third stripe pattern P3, that is, the first direction D1 is different from the second direction D2. Therefore, when the first stripe pattern P1 arranged along the first direction D1 is interlaced with the third stripe pattern P3 arranged along the second direction D2, the first stripe pattern P1 is also arranged along the second direction D2 The fourth stripe pattern P4 is staggered, and the second stripe pattern P2 arranged along the first direction D1 is also interlaced with the third stripe pattern P3. Similarly, the second stripe pattern P2 is also interlaced with the fourth stripe pattern P4 arranged along the second direction D2.

In addition, in the embodiment, the first strip pattern P1 is substantially perpendicular to the third strip pattern P3, that is, the first direction D1 is substantially perpendicular to the second direction D2. Therefore, when the first stripe pattern P1 is substantially perpendicular to the third stripe pattern P3, the first stripe pattern P1 is substantially perpendicular to the fourth stripe pattern P4, and the second stripe pattern P2 is substantially perpendicular to the The three stripe pattern P3, and the second stripe pattern P2 is substantially perpendicular to the fourth stripe pattern P4.

Referring to FIG. 3, in the embodiment, each of the second pixels 140 further includes at least one second switching element 146. In the present embodiment, the second switching element 146 is, for example, a bottom gate type transistor, but the invention is not limited thereto, and a top gate type transistor can also be used. Furthermore, the first switching element 126 and the second Switching elements 146 can be selectively the same or different types. The third electrode 142 is electrically connected to the second switching element 146, and the second switching element 146 is connected to the corresponding signal lines, such as the scan line and the data line, to further control whether the voltage information of each signal line is written into the third electrode 142. On the other hand, the fourth electrode 144 is electrically coupled to the common voltage V. Therefore, when the third electrode 142 and the fourth electrode 144 are respectively applied with appropriate voltages, the second pixel 140 is turned on to generate a second lateral electric field E2 between the third strip pattern P3 and the fourth strip pattern P4. .

In detail, when the second switching element 146 is turned on to write voltage information to the third electrode 142, the third electrode 142 is applied with a voltage, and its voltage value is different from the voltage value of the common voltage V, so that the third electrode There is a voltage difference between 142 and fourth electrode 144. At this time, a second transverse electric field E2 is generated between each of the third stripe patterns P3 and the adjacent fourth stripe pattern P4 via a voltage difference to change the arrangement of the liquid crystal molecules in the second pixel 140.

Specifically, referring to FIG. 5, a second lateral electric field E2 is generated between each of the third stripe patterns P3 and the adjacent fourth stripe pattern P4, such that each of the third stripe patterns P3 and the adjacent fourth strips The area between the pattern P4 is the bright area BR2. On the other hand, the region occupied by each of the third stripe pattern P3 and each of the fourth stripe patterns P4 does not have the second lateral electric field E2. Therefore, the area occupied by each of the third stripe pattern P3 and each of the fourth stripe patterns P4 is the dark area DR2.

In this embodiment, the width L2 of each of the third stripe pattern P3 and each of the fourth stripe patterns P4 is substantially the same, for example, and the pitch S2 of each of the third stripe pattern P3 and the adjacent fourth stripe pattern P4. For example, they are essentially the same, and The ratio of the width L2 to the pitch S2 is, for example, about 3:4, that is, the ratio of the area of the bright area BR2 to the dark area DR2 is, for example, about 4:3. However, in other embodiments, the ratio of the width L2 to the spacing S2 may be, for example, about 3:3 or 3:5, and the invention is not limited thereto.

In this embodiment, since the first stripe pattern P1 and the second stripe pattern P2 can be regarded as being arranged along the first direction D1, each of the first stripe pattern P1 and the adjacent second stripe pattern P2 The first transverse electric field E1 generated between the two can be regarded as an electric field substantially perpendicular to the first direction D1. Similarly, the second transverse electric field E2 generated between each of the third stripe pattern P3 and the adjacent fourth stripe pattern P4 can be regarded as an electric field substantially perpendicular to the second direction D2. Therefore, since the first direction D1 of the present embodiment is different from the second direction D2, the first lateral electric field E1 is different from the second lateral electric field E2.

Further, the bright area BR1 and the dark area DR1 generated via the first lateral electric field E1 can be regarded as being alternately arranged along the first direction D1, and the bright area BR2 and the dark area DR2 generated via the second transverse electric field E2 are visible. It is alternately arranged with each other along the second direction D2. Therefore, when the first pixel 120 and the second pixel 140 are respectively disposed on the first substrate 110 and the second substrate 130 and respectively generate the first lateral electric field E1 and the second lateral electric field E2, the first pixels 120 are arranged along the first direction D1. The bright area BR1 and the dark area DR1 and the bright area BR2 and the dark area DR2 arranged along the second direction D2 are interlaced with each other.

Figure 5 is a schematic view of the blue phase liquid crystal display panel of Figure 3 when it is turned on. Referring to FIG. 5, in the embodiment, the first direction D1 is substantially perpendicular to the second direction D2. Therefore, the first lateral electric field E1 is substantially perpendicular to the second lateral electric field E2. When the first pixel 120 and the second pixel 140 are arrayed separately On the first substrate 110 and the second substrate 130, the bright regions BR1 and the dark regions DR1 and the second regions along the first direction D1 are viewed from the perspective of the first substrate 110 and the second substrate 130. The bright area BR2 arranged in the direction D2 and the dark area DR2 are vertically staggered into a lattice shape.

In this embodiment, the intersection of the first stripe pattern P1 and the third stripe pattern P3, the intersection of the first stripe pattern P1 and the fourth stripe pattern P4, the second stripe pattern P2 and the third strip The staggered portion of the pattern P3 and the intersection of the second strip pattern P2 and the fourth strip pattern P4 are defined as a plurality of dark regions DR separated from each other. The staggered portions of these strip patterns do not have a first transverse electric field E1 and a second transverse electric field E2. In other words, these interlaces are regions formed by overlapping the dark region DR1 of the original first pixel 120 and the dark region DR2 of the second pixel 140. Therefore, the blue phase liquid crystal display panel 100 does not display luminance at the dark area DR.

On the other hand, in a region where the first stripe pattern P1, the second stripe pattern P2, the third stripe pattern P3, and the fourth stripe pattern P4 are distributed, a partial region other than the dark region DR is defined as a plurality of mutually Separated bright area BR. These bright areas BR are areas occupied by the stripe pattern, but exclude areas where the other strip patterns overlap, that is, the areas where the strip patterns overlap with the strip patterns of the other direction. The bright area BR can be regarded as that the dark area DR1 and the bright area BR2 overlap each other or the dark area DR2 and the bright area BR1 overlap each other. The bright area BR has a first transverse electric field E1 or a second transverse electric field E2. Therefore, the blue phase liquid crystal display panel 100 displays the brightness at the bright area BR.

In addition, in the embodiment, the regions in which the first stripe pattern P1, the second stripe pattern P2, the third stripe pattern P3, and the fourth stripe pattern P4 are not distributed The domain is defined as the semi-transparent zone TR. These semi-transmissive regions TR can be regarded as regions overlapping each other at intervals between the strip patterns of the first direction D1 and the strip patterns of the second direction D2. In other words, the semi-transparent area TR can be regarded as being formed by overlapping the bright area BR1 and the bright area BR2. It can be seen from FIG. 5 that the plurality of edges of the semi-transparent area TR are respectively surrounded by at least two bright areas BR1 and at least two bright areas BR2, so that the semi-transparent area TR is located in at least two bright areas BR1 and at least two bright areas. Between the areas BR2. Therefore, the semi-transmissive region TR has both the first transverse electric field E1 and the second transverse electric field E2. The blue phase liquid crystal display panel 100 displays brightness at the semi-transmissive region TR under the action of electric fields in two different directions, but the luminance of the transmissive region TR is between the dark region DR and the bright region BR.

Therefore, this embodiment is compared with the prior art of FIG. In the case where the width and the pitch ratio of the stripe pattern of the blue phase liquid crystal display panel 50 and the blue phase liquid crystal display panel 100 are equal, the area in which the blue phase liquid crystal display panel 100 can display brightness is more translucent than the blue phase liquid crystal display panel 50. District TR. Although the brightness of the semi-transmissive region TR is not as good as the bright region BR, the overall transmissive region TR still increases the transmittance of the blue phase liquid crystal display panel 100.

At this time, the blue phase liquid crystal display panel 100 generates the first lateral electric field E1 and the second lateral electric field E2 by turning on the first pixel 120 and the second pixel 140 to display an image. Therefore, when driving the blue phase liquid crystal display panel 100, the first electrode 122 and the second electrode 124 may be driven to generate a first lateral electric field E1 and simultaneously drive the third electrode 142 and the fourth electrode 144 to generate a second lateral electric field E2, Or driving the third electrode 142 and the fourth electrode 144 to generate the second lateral electric field E2, and then driving the first electrode 122 and the second electrode 124. The first transverse electric field E1 is generated to cause the blue phase liquid crystal layer 150 to display an image.

It should be noted that the first transverse electric field E1 and the second transverse electric field E2 together determine the arrangement of the blue phase liquid crystal layer 150, and in the presence of the second transverse electric field E2, by the first electrode 122 and the second electrode 124 The first lateral electric field E1 provided can be further reduced, thereby achieving the effect of lowering the driving voltage.

6 is a driving voltage-transmission curve (V-T curves) of the blue phase liquid crystal display panel of FIG. 3 and the conventional blue phase liquid crystal display panel of FIG. Referring to FIG. 6, the blue phase liquid crystal display panel 50 of the prior art is provided with a planar conversion type pixel unit 54 only on the lower substrate 52, and the pixel unit 54 has a pixel electrode 54a and a common electrode 54b. In contrast, in the embodiment, the first pixel 120 and the second pixel 140 are respectively disposed on the first substrate 110 and the second substrate 130, wherein the first pixel 120 includes the first electrode 122 and the second electrode 124, and the first The two pixels 140 include a third electrode 142 and a fourth electrode 144, and the strip patterns of the electrodes of the first pixel 120 are vertically interlaced with the strip patterns of the electrodes of the second pixel 140.

It can be seen from the relationship curve of FIG. 6 that the driving voltage required for the blue phase liquid crystal display panel 100 (this embodiment) is lower than that of the blue phase liquid crystal display panel 50 (known art) at the same transmittance. Drive voltage. Therefore, the electric fields of the two different directions of the blue phase liquid crystal display panel 100 contribute to lowering the driving voltage of the blue phase liquid crystal display panel 100. Further, in the case of the same driving voltage, the transmittance of the blue phase liquid crystal display panel 100 (this embodiment) is higher than that of the blue phase liquid crystal display panel 50 (known technique). Therefore, the electric fields of the two different directions of the blue phase liquid crystal display panel 100 contribute to improvement. The transmittance of the blue phase liquid crystal display panel 100.

In summary, the present invention provides a blue phase liquid crystal display panel in which a first pixel and a second pixel are respectively disposed on two oppositely disposed substrates. The first pixel and the second pixel respectively have a plurality of electrodes alternately arranged and parallel to each other, wherein the first pixel is interlaced with the electrode pattern of the second pixel, and the blue phase liquid crystal layer is disposed on the first pixel and the first pixel Between two pixels. Therefore, the first pixel and the second pixel respectively generate the first transverse electric field and the second transverse electric field, so that the blue phase liquid crystal display panel is divided into a plurality of dark regions, bright regions and semi-transmissive regions according to the displayed gray scale brightness. Accordingly, the blue phase liquid crystal display panel has a lower driving voltage and a higher transmittance.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

50, 100‧‧‧ blue phase liquid crystal display panel

52‧‧‧lower substrate

54‧‧‧ pixel unit

54a‧‧‧ pixel electrodes

54b‧‧‧Common electrode

110‧‧‧First substrate

120‧‧‧ first pixels

122‧‧‧First electrode

124‧‧‧second electrode

126‧‧‧First switching element

130‧‧‧second substrate

140‧‧‧Second pixels

142‧‧‧ third electrode

144‧‧‧fourth electrode

146‧‧‧Second switching element

150‧‧‧Blue phase liquid crystal layer

B, BR, BR1, BR2‧‧ dark areas

D, DR, DR1, DR2‧‧‧ bright areas

TR, TR1, TR2‧‧‧ semi-permeable area

D1‧‧‧ first direction

D2‧‧‧ second direction

E‧‧‧ electric field

E1‧‧‧ first transverse electric field

E2‧‧‧second transverse electric field

SP1, SP2‧‧‧ strip pattern

P1‧‧‧ first strip pattern

P2‧‧‧Second strip pattern

P3‧‧‧ third strip pattern

P4‧‧‧fourth pattern

L1, L2‧‧‧ width

S1, S2‧‧‧ spacing

V‧‧‧Common voltage

1 is a partial schematic view of a conventional blue phase liquid crystal display panel.

Figure 2 is a schematic illustration of the pixel unit of Figure 1 being opened.

3 is a cross-sectional view showing a blue phase liquid crystal display panel according to an embodiment of the present invention.

4 is a partial schematic view of the blue phase liquid crystal display panel of FIG. 3 at a first pixel and a second pixel.

Figure 5 is a schematic view of the blue phase liquid crystal display panel of Figure 3 when it is turned on.

Figure 6 is a blue phase liquid crystal display panel of Figure 3 and the conventional blue phase of Figure 1. The driving voltage-transmission curve (V-T curves) of the liquid crystal display panel.

100‧‧‧Blue phase liquid crystal display panel

110‧‧‧First substrate

120‧‧‧ first pixels

122‧‧‧First electrode

124‧‧‧second electrode

126‧‧‧First switching element

130‧‧‧second substrate

140‧‧‧Second pixels

142‧‧‧ third electrode

146‧‧‧Second switching element

150‧‧‧Blue phase liquid crystal layer

E1‧‧‧ first transverse electric field

P1‧‧‧ first strip pattern

P2‧‧‧Second strip pattern

P3‧‧‧ third strip pattern

L1‧‧‧Width

S1‧‧‧ spacing

Claims (7)

A blue phase liquid crystal display panel includes: a first substrate; a plurality of first pixels arranged on the first substrate, each of the first pixels comprising a first electrode and a second electrically insulated from each other An electrode, wherein the first electrode has a plurality of first strip patterns connected to each other, the second electrode has a plurality of second strip patterns connected to each other, and the first strip patterns and the second strip patterns The patterns are alternately arranged, and the first strip patterns are substantially parallel to the second strip patterns; a second substrate is disposed opposite the first substrate; and a plurality of second pixels are arranged in the second On the substrate, each of the second pixels includes a third electrode electrically insulated from each other and a fourth electrode, wherein the third electrode has a plurality of third strip patterns connected to each other, the fourth electrode having a plurality of mutual a fourth strip pattern connected, the third strip patterns are alternately arranged with the fourth strip patterns, and the third strip patterns are substantially parallel to the fourth strip patterns, and the a strip pattern interlaced with the third strip patterns Mass vertical; blue phase and a liquid crystal layer disposed between the plurality of first pixel and the plurality of second pixels. The blue phase liquid crystal display panel of claim 1, wherein each of the first pixels further includes a first switching element electrically connected to the first electrode, and each of the second pixels further comprises a The second electrode is electrically connected to the second switching element, wherein each of the second electrodes and each of the fourth electrodes are electrically coupled to a common voltage. For example, the blue phase liquid crystal display panel described in claim 1 is The first strip patterns are interlaced with the fourth strip patterns, and the second strip patterns are interlaced with the third strip patterns, and the second strip patterns and the fourth strips The patterns are staggered. The blue phase liquid crystal display panel of claim 3, wherein a first transverse electric field is generated between each of the first strip patterns and the adjacent second strip pattern, and each of the third strip patterns A second transverse electric field is generated between the adjacent fourth strip pattern, and the first transverse electric field is different from the second transverse electric field. The blue phase liquid crystal display panel of claim 4, wherein the first strip patterns and the third strip patterns are interlaced, the first strip patterns and the fourth strips The staggered portion of the pattern, the intersection of the second strip patterns and the third strip patterns, and the intersection of the second strip patterns and the fourth strip patterns are defined as a plurality of separated from each other Dark regions, and in regions where the first strip pattern, the second strip pattern, the third strip pattern, and the fourth strip pattern are distributed, portions of the dark regions are defined as a plurality of regions The bright regions separated from each other, and regions in which the first stripe pattern, the second stripe pattern, the third stripe pattern, and the fourth stripe pattern are not distributed are defined as translucent regions. The blue phase liquid crystal display panel of claim 1, wherein the first strip patterns are substantially perpendicular to the fourth strip patterns, and the second strip patterns are substantially perpendicular to the a third strip pattern, and the second strip patterns are substantially perpendicular to the fourth strip patterns. The blue phase liquid crystal display panel of claim 6, wherein each of the first strip pattern and the adjacent second strip pattern generates a a first transverse electric field, and a second transverse electric field is generated between each of the third strip patterns and the adjacent fourth strip pattern, and the first transverse electric field is substantially perpendicular to the second transverse electric field.