Liquid crystal display panel comprising first, second, and third sub-pixels and first and second control electrodes having different polarities

A liquid crystal display panel including first and second substrates, a sub-pixel row, first and second control electrodes is provided. The sub-pixel row is disposed on the first substrate and includes first, second and third sub-pixels arranged in sequence along a first direction, the polarity of the first sub-pixel and the polarity of third sub-pixel are the same, the polarity of the second sub-pixel is different from the polarities of the first and third sub-pixels, each of the first to third sub-pixels has a first region and a second region arranged along a second direction, and includes an electrode having a first slit pattern and a second slit pattern respectively located in the first region and the second region, wherein the extending direction of the first slit pattern is different from that of the second slit pattern, and the extending directions of the first slit patterns of two adjacent electrodes are different. The first and second control electrodes having different polarities are disposed on the second substrate and respectively overlap the first and the second regions.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority benefit of Taiwan application serial no. 106128943, filed on Aug. 25, 2017. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.

BACKGROUND OF THE INVENTION

Field of the Invention

The invention is related to a display panel, and particularly to a liquid crystal display panel.

Description of Related Art

In order to prevent that highly confidential data is peeped by someone else, existing display apparatuses that have privacy protection function are designed in the manner that privacy is protected in all viewing angles except the normal viewing angle. In other words, an image cannot be seen clearly by user in any other viewing angles except the normal viewing angle. However, the above-mentioned wide viewing angle does not selectively have a privacy protection effect at a specific viewing angle, and thus the commercial application thereof is restricted.

SUMMARY OF THE INVENTION

The invention provides a liquid crystal display panel which has a privacy protection effect at a specific viewing angle.

The invention provides a liquid crystal display panel which selectively has a privacy protection effect at a specific viewing angle.

In an embodiment of the invention, a liquid crystal display panel includes a first substrate, a second substrate, a liquid crystal layer, a first sub-pixel row, a first control electrode and a second control electrode. The second substrate is opposite to the first substrate. The liquid crystal layer is disposed between the first substrate and the second substrate. The first sub-pixel row is disposed on the first substrate and includes a first sub-pixel, a second sub-pixel and a third sub-pixel arranged in sequence along a first direction. A polarity of the first sub-pixel is the same as a polarity of the third sub-pixel. A polarity of the second sub-pixel is different from the polarity of the first sub-pixel and the polarity of the third sub-pixel. Each of the first sub-pixel, the second sub-pixel and the third sub-pixel has a first region and a second region arranged along a second direction. The first direction intersects with the second direction. Each of the first sub-pixel, the second sub-pixel and the third sub-pixel includes a first electrode, wherein each of the first electrodes has at least one first slit pattern and at least one second slit pattern. At least one first slit pattern is disposed in the first region. At least one second slit pattern is disposed in the second region. An extending direction of the at least one first slit pattern is different from an extending direction of the at least one second slit pattern. Moreover, in the first direction, the extending directions of the at least one first slit pattern of two adjacent first electrodes are different. A first control electrode is disposed on the second substrate and overlaps the first region of the first sub-pixel, the first region of the second sub-pixel and the first region of the third sub-pixel. A second control electrode is disposed on the second substrate and overlaps the second region of the first sub-pixel, the second region of the second sub-pixel and the second region of the third sub-pixel, wherein a polarity of the first control electrode is different from a polarity of the second control electrode.

In an embodiment of the invention, the liquid crystal display panel includes a first substrate, a second substrate, a liquid crystal layer, a first sub-pixel row, a second sub-pixel row, a first control electrode and a second control electrode. The second substrate is opposite to the first substrate. The liquid crystal layer is disposed between the first substrate and the second substrate. The first sub-pixel row is disposed on the first substrate and includes a first sub-pixel, a second sub-pixel and a third sub-pixel arranged in sequence along a first direction. A polarity of the first sub-pixel is the same as a polarity of the third sub-pixel. A polarity of the second sub-pixel is different from the polarity of the first sub-pixel and the polarity of the third sub-pixel. Each of the first sub-pixel, the second sub-pixel and the third sub-pixel includes a first electrode, wherein each of the first electrodes has at least one slit pattern. In the first direction, the extending directions of the at least one slit pattern of two adjacent first electrodes are different. The second sub-pixel row is disposed on the first substrate and includes a fourth sub-pixel, a fifth sub-pixel and a sixth sub-pixel arranged in sequence along the first direction. A polarity of the fourth sub-pixel is the same as a polarity of the sixth sub-pixel. A polarity of the fifth sub-pixel is different from the polarity of the fourth sub-pixel and the polarity of the sixth sub-pixel. Each of the fourth sub-pixel, the fifth sub-pixel and the sixth sub-pixel includes the first electrode, wherein the fourth sub-pixel and the first sub-pixel are arranged in a second direction. The first direction intersects with the second direction, and the polarity of the fourth sub-pixel is different from the polarity of the first sub-pixel. The first control electrode is disposed on the second substrate and overlaps the first sub-pixel, the second sub-pixel and the third sub-pixel. The second control electrode is disposed on the second substrate and overlaps the fourth sub-pixel, the fifth sub-pixel and the sixth sub-pixel, wherein a polarity of the first control electrode is different from a polarity of the second control electrode.

In summary, according to an embodiment of the invention, the liquid crystal display panel can achieve the privacy protection effect at a specific viewing angle with the design that the polarity of the first sub-pixel is the same as the polarity of the third sub-pixel, the polarity of the second sub-pixel is different from the polarity of the first sub-pixel and the polarity of the third sub-pixel, the polarity of the first control electrode is different from the polarity of the second control electrode, the extending direction of at least one first slit pattern is different from the extending direction of at least one second slit pattern, and in the first direction, the extending directions of at least one first slit pattern of any two adjacent ones of the first sub-pixel, the second sub-pixel and the third sub-pixel are different from each other; or with the design that the polarity of the first sub-pixel is the same as the polarity of the third sub-pixel, the polarity of the second sub-pixel is different from the polarity of the first sub-pixel and the polarity of the third sub-pixel, the polarity of the fourth sub-pixel is the same as the polarity of the sixth sub-pixel, the polarity of the fifth sub-pixel is different from the polarity of the fourth sub-pixel and the polarity of the sixth sub-pixel, the polarity of the fourth sub-pixel is different from the polarity of the first sub-pixel, the polarity of the first control electrode is different from the polarity of the second control electrode, and in the first direction, the extending directions of the at least one slit pattern of any two adjacent ones of the first sub-pixel, the second sub-pixel, the third sub-pixel, the fourth sub-pixel, the fifth sub-pixel and the sixth sub-pixel are different from each other.

In order to make the aforementioned features and advantages of the invention more comprehensible, embodiments accompanying figures are described in detail below.

DESCRIPTION OF EMBODIMENTS

FIG. 1is a top view illustrating a liquid crystal display panel according to a first embodiment of the invention.FIG. 2is a cross-sectional view taken along line I-I′ ofFIG. 1.FIG. 3is an enlarged top view illustrating a first electrode PE1and a first electrode PE2inFIG. 1.

Referring toFIG. 1toFIG. 3, a liquid crystal display panel10includes a first substrate100, a second substrate110, a liquid crystal layer120, a first sub-pixel row R1, a second sub-pixel row R2, a first control electrode CE1and a second control electrode CE2. In addition, the liquid crystal display panel10may further include scan line SL1, scan line SL2, data line DL1, data line DL2, data line DL3, data line DL4, insulating layer GI, protecting layer BP, common electrode layer CM, interlayered insulating layer IL, alignment film130aand alignment film130b. For clearer descriptions, the illustration ofFIG. 1does not show the first substrate100, the second substrate110, the liquid crystal layer120, the insulating layer GI, the protecting layer BP, the interlayered insulating layer IL, the alignment film130aand the alignment film130b.

The material of the first substrate100may be glass, quartz or organic polymer. The second substrate110is opposite to the first substrate100. The material of the second substrate100may be glass, quartz or organic polymer.

The liquid crystal layer120is disposed between the first substrate100and the second substrate110. In the embodiment, the liquid crystal molecules of the liquid crystal layer120may be a positive liquid crystal molecule, and a longitudinal axis thereof is parallel with an electric field direction when being driven by the electric field.

The scan lines SL1, SL2, the data lines DL1, DL2, DL3and DL4are disposed on the first substrate100. The extending direction of the scan lines SL1and SL2is different from the extending direction of the data lines DL1, DL2, DL3and DL4. Preferably, the extending direction of the scan lines SL1and SL2is perpendicular to the extending direction of the data lines DL1, DL2, DL3and DL4. In the embodiment, the extending direction of the scan lines SL1and SL2is a first direction D1, and the extending direction of the data lines DL1, DL2, DL3and DL4is a second direction D2, wherein the first direction D1and the second direction D2are perpendicular to each other, that is, the first direction D1intersects the second direction D2.

In addition, the scan lines SL1, SL2and the data lines DL1, DL2, DL3and DL4may be disposed on different layers, and the insulating layer GI may be sandwiched between the scan lines SL1, SL2and the data lines DL1, DL2, DL3and DL4. In consideration of conductivity, the scan liens SL1, SL2and the data lines DL1, DL2, DL3and DL4are generally formed of metal material, which should not be construed as a limitation to the invention. According to other embodiments, the scan lines SL1, SL2and the data lines DL1, DL2, DL3and DL4may be formed of other conductive materials such as alloy, nitride of metal material, oxide of metal material, oxynitride of metal material and so on, or stacked layer of metal material and the aforesaid conductive materials. In addition, the material of the insulating layer GI may be an inorganic material, an organic material or a combination thereof, wherein the inorganic material is, for example, silicon oxide, silicon nitride, silicon oxynitride, or a stacked layer of at least two materials mentioned above; the organic material is polymer material such as a polyimide-based resin, an epoxy-based resin or an acrylic-based resin.

The first sub-pixel row R1is disposed on the first substrate100and includes a first sub-pixel P1, a second sub-pixel P2and a third sub-pixel P3arranged in sequence along the first direction D1. The second sub-pixel row R2is disposed on the first substrate100and includes a fourth sub-pixel P4, a fifth sub-pixel P5and a sixth sub-pixel P6arranged in sequence along the first direction D1. In the embodiment, the first sub-pixel P1and the fourth sub-pixel P4are arranged in sequence along the second direction D2. In addition, in the embodiment, the first sub-pixel P1is electrically connected with the scan line SL1and the data line DL1. The second sub-pixel P2is electrically connected with the scan line SL1and the data line DL2. The third sub-pixel P3is electrically connected with the scan line SL1and the data line DL3. The fourth sub-pixel P4is electrically connected with the scan line SL2and the data line DL2. The fifth sub-pixel P5is electrically connected with the scan line SL2and the data line DL3. The sixth sub-pixel P6is electrically connected with the scan line SL2and the data line DL4.

In the embodiment, the polarity of the first sub-pixel P1is the same as the polarity of the third sub-pixel P3. The polarity of the second sub-pixel P2is different from the polarity of the first sub-pixel P1and the polarity of the third sub-pixel P3. The polarity of the fourth sub-pixel P4is the same as the polarity of the sixth sub-pixel P6. The polarity of the fifth sub-pixel P5is different from the polarity of the fourth sub-pixel P4and the polarity of the sixth sub-pixel P6. The polarity of the fourth sub-pixel P4is different from the polarity of the first sub-pixel P1. Each data line inputs corresponding data voltage or signal to a corresponding sub-pixel such that each sub-pixel exhibits the required display effect. In other words, in the embodiment, the voltage polarity received by the data line D1and the voltage polarity received by the data line D3are the same. The voltage polarity received by the data line DL2and the voltage polarity received by the data line DL4are the same. The voltage polarity received by the data line DL2and the voltage polarity received by the data line DL4are different from the voltage polarity received by the data line DL1. The voltage polarity received by the data line DL2and the voltage polarity received by the data line DL4are different from the voltage polarity received by the data line DL3. For example, in an embodiment, when the first sub-pixel P1, the second sub-pixel P2, the third sub-pixel P3, the fourth sub-pixel P4, the fifth sub-pixel P5and the sixth sub-pixel P6are operated or driven, in the same time period, the data line DL1and the data line DL3receive a positive voltage, and the data line DL2and the data line DL4receive a negative voltage. In the descriptions, the negative voltage received by the data line is defined as a situation that the voltage of the data line is substantially smaller than the voltage of a common electrode layer CM (detailed descriptions are incorporated in the following passage). Meanwhile, the positive voltage received by the data line is defined as a situation that the voltage of the data line is substantially larger than the voltage of the common electrode layer CM (detailed descriptions are incorporated in the following passage).

In the embodiment, the first sub-pixel P1includes a first electrode PE1, the second sub-pixel P2includes a first electrode PE2, the third sub-pixel P3includes a first electrode PE3, the fourth sub-pixel P4includes a first electrode PE4, the fifth sub-pixel P5includes a first electrode PE5, and the sixth sub-pixel P6includes a first electrode PE6. Each of the first electrodes PE1, PE2, PE3, PE4, PE5and PE6is, for example, a transparent conductive layer, and the material thereof includes a metal oxide conductive material such as indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, indium germanium zinc oxide, or other suitable oxide, or a stacked layer of at least two materials mentioned above.

Referring toFIG. 1andFIG. 3, the first electrode PE1includes a frame C1and branches E1connected with the frame C1, wherein a slit pattern St1is formed between two adjacent branches E1, and the first electrode PE2includes a frame C2and branches E2connected with the frame C2, wherein a slit pattern St2is formed between two adjacent branches E2. In other words, in the embodiment, the first electrode PE1and the first electrode PE2are patterned electrodes.

In the embodiment, an included angle θ1between an extending direction of each slit pattern St1of the first electrode PE1and the first direction D1is larger than 0 degree and smaller than or equal to 45 degrees. An included angle θ2between an extending direction of each slit pattern St2of the first electrode PE2and the first direction D1is larger than 0 degree and smaller than or equal to 45 degrees. Additionally, in the descriptions, the first direction D1serves as the basis, the included angle θ1between the extending direction of each slit pattern St1of the first electrode PE1and the first direction D1is defined as a positive angle, and the included angle θ2between the extending direction of each slit pattern St2of the first electrode PE2and the first direction D1is defined as a negative angle. That is to say, in the embodiment, the extending direction of each slit pattern St1of the first electrode PE1is different from the extending direction of each slit pattern St2of the first electrode PE2. In this manner, when being driven by the electric field, the deflection direction of the liquid crystal molecule in the liquid crystal layer120corresponding to the first electrode PE1is opposite to the deflection direction of the liquid crystal molecule in the liquid crystal layer120corresponding to the first electrode PE2.

Moreover, as shown inFIG. 1, in the embodiment, the first electrodes PE3, PE4, PE6have the same construction as the first electrode PE1, and the first electrode PE5has the same construction as the first electrode PE2. Based on the above, according to the descriptions regarding the first electrode PE1and the first electrode PE2, persons of ordinary skill in the art should be able to understand the detailed structure of the first electrodes PE3, PE4, PE5and PE6; therefore, no further descriptions are incorporated herein. Furthermore, according to the descriptions regarding the first electrode PE1and the first electrode PE2, persons of ordinary skill in the art should be able to understand that the extending direction of each slit pattern of the first electrode PE3is different from the extending direction of each slit pattern St2of the first electrode PE2, the extending direction of each slit pattern of the first electrode PE4is different from the extending direction of each slit pattern of the first electrode PE5, and the extending direction of each slit pattern of the first electrode PE6is different from the extending direction of each slit pattern of the first electrode PE5. In other words, in the embodiment, in the first direction D1, the extending directions of the slit patterns of any two adjacent first electrodes are different from each other.

In the embodiment, the first sub-pixel P1further includes an active element T1, the second sub-pixel P2further includes an active element T2, the third sub-pixel P3further includes an active element T3, the fourth sub-pixel P4further includes an active element T4, the fifth sub-pixel P5further includes an active element T5, the sixth sub-pixel P6further includes an active element T6. In the embodiment, the active element T1is electrically connected with the scan line SL1, the data line DL1and the first electrode PE1, the active element T2is electrically connected with the scan line SL1, the data line DL2and the first electrode PE2, the active element T3is electrically connected with the scan line SL1, the data line DL3and the first electrode PE3, the active element T4is electrically connected with the scan line SL2, the data line DL2and the first electrode PE4, the active element T5is electrically connected with the scan line SL2, the data line DL3and the first electrode PE5, the active element T6is electrically connected with the scan line SL2, the data line DL4and the first electrode PE6. That is to say, in the embodiment, the first electrodes PE1, PE2, PE3, PE4, PE5and PE6respectively serve as the pixel electrode for the first sub-pixel P1, the pixel electrode for the second sub-pixel P2, the pixel electrode for the third sub-pixel P3, the pixel electrode for the fourth sub-pixel P4, the pixel electrode for the fifth sub-pixel P5and the pixel electrode for the sixth sub-pixel P6.

The active elements T1, T2, T3, T4, T5and T6may be any active element known to persons of ordinary skill in the art. In the embodiment, the active elements T1, T2, T3, T4, T5and T6are a bottom gate thin film transistor, which includes a gate, a channel layer, a source and a drain, which should not be construed as a limitation to the invention. In other embodiment, the active elements T1, T2, T3, T4, T5and T6may be a top gate thin film transistor.

In addition, in the embodiment, the active elements T1, T2, T3, T4, T5and T6are further covered by the protecting layer BP to protect the active elements T1, T2, T3, T4, T5and T6. The material of the protecting layer BP may be an inorganic material, an organic material or a combination thereof, wherein the inorganic material may be silicon oxide, silicon nitride, silicon oxynitride, or a stacked layer of at least two materials mentioned above; the organic material is polymer material such as a polyimide-based resin, an epoxy-based resin, or an acrylic-based resin.

In the embodiment, the common electrode layer CM may be a non-patterned electrode layer. A portion of the common electrode layer CM corresponding to the first electrode PE1serves as a second electrode of the first sub-pixel P1. A portion of the common electrode layer CM corresponding to the first electrode PE2serves as a second electrode of the second sub-pixel P2. A portion of the common electrode layer CM corresponding to the first electrode PE3serves as a second electrode of the third sub-pixel P3. A portion of the common electrode layer CM corresponding to the first electrode PE4serves as a second electrode of the fourth sub-pixel P4. A portion of the common electrode layer CM corresponding to the first electrode PE5serves as a second electrode of the fifth sub-pixel P5. A portion of the common electrode layer CM corresponding to the first electrode PE6serves as a second electrode of the sixth sub-pixel P6. In other words, in the embodiment, said second electrodes respectively serve as the common electrode for the first sub-pixel P1, the common electrode for the second sub-pixel P2, the common electrode for the third sub-pixel P3, the common electrode for the fourth sub-pixel P4, the common electrode for the fifth sub-pixel P5and the common electrode for the sixth sub-pixel P6.

In the embodiment, the interlayered insulating layer IL is further disposed between the common electrode layer CM and the first electrodes PE1, PE2, PE3, PE4, PE5and PE6such that the common electrode layer CM is structurally separated from the first electrodes PE1, PE2, PE3, PE4, PE5and PE6. Additionally, as shown inFIG. 2, the first electrode PE1and the first electrode PE4are disposed above the interlayered insulating layer IL, and the common electrode layer CM is disposed under the interlayered insulating layer IL. That is to say, in the embodiment, the common electrode layer CM is correspondingly disposed under the first electrodes PE1, PE2, PE3, PE4, PE5and PE6.

The common electrode layer CM is, for example, a transparent conductive layer, and the material thereof includes metal oxide conductive material such as indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, indium germanium zinc oxide, or other suitable oxide, or a stacked layer of at least two materials mentioned above. The material of the interlayered insulating layer IL may be an inorganic material, an organic material or a combination thereof, wherein the inorganic material is, for example, silicon oxide, silicon nitride, silicon oxynitride, or a stacked layer of at least two materials mentioned above; an organic material is polymer material such as a polyimide-based resin, an epoxy-based resin or an acrylic-based resin.

In the embodiment, the common electrode layer CM is electrically connected with a common voltage Vcom1. The negative voltage received by the data line is defined as a situation that the voltage received by the data line is smaller than the common voltage Vcom1. The positive voltage received by the data line is defined as a situation that the voltage received by the data line is larger than the common voltage Vcom1.

In the embodiment, when the liquid crystal display panel10is in the display mode, a fringe electric field is generated between the first electrodes PE1, PE2, PE3, PE4, PE5and PE6and the common electrode layer CM. That is to say, the liquid crystal display panel10is a fringe field switching (FFS) liquid crystal display panel. Moreover, as described above, when the liquid crystal display panel10is in the display mode, an included angle, which is larger than or equal to 45 degrees and smaller than 90 degrees, is formed substantially between the fringe electric field direction and the first direction D1. In the embodiment, the liquid crystal molecule (not shown) in the liquid crystal layer120is driven by the fringe electric field and deflects accordingly.

The first control electrode CE1is disposed on the second substrate110and overlaps the first sub-pixel P1, the second sub-pixel P2, the third sub-pixel P3, and the second control electrode CE2is disposed on the second substrate110and overlaps the fourth sub-pixel P4, the fifth sub-pixel P5, and the sixth sub-pixel P6. In other words, in the embodiment, the first control electrode CE1and the second control electrode CE2are arranged in sequence along the second direction D2.

Furthermore, the polarity of the first control electrode CE1is different from the polarity of the second electrode CE2. For example, in an embodiment, the first control electrode CE1is electrically connected with the positive voltage, and the second control electrode CE2is electrically connected to the negative voltage. In the descriptions, the negative voltage received by the control electrode is defined as a situation that the voltage received by the control electrode is smaller than the common voltage Vcom1of the common electrode layer CM. The positive voltage received by the control electrode is defined as a situation that the voltage received by the control electrode is larger than the common voltage Vcom1of the common electrode layer CM.

In the embodiment, the first control electrode CE1is electrically connected with a common voltage Vcom2, and the second control electrode CE2is electrically connected with a common voltage Vcom3. In this manner, when the first control electrode CE1is electrically connected with the positive voltage, and the second control electrode CE2is electrically connected with the negative voltage, the common voltage Vcom2is larger than the common voltage Vcom1, and the common voltage Vcom3is smaller than the common voltage Vcom1.

Additionally, when the liquid crystal display panel10is in the display mode, the first control electrode CE1is electrically connected with the common voltage Vcom2so as to generate a vertical electric field between the first control electrode CE1and at least one of the first electrodes PE1, PE2and PE3. Meanwhile, the second control electrode CE2is electrically connected with the common voltage Vcom3so as to generate a vertical electric field between the second control electrode CE2and at least one of the first electrodes PE4, PE5and PE6.

It should be mentioned that, when the liquid crystal display panel10is in the display mode and the liquid crystal display panel10generates the vertical electric field, the longitudinal axis of the liquid crystal molecule (not shown) in the liquid crystal layer120that is driven by the vertical electric field is approximately perpendicular to the first substrate100and the second substrate110, such that the display brightness presented at a partial side viewing angle is reduced significantly, thereby achieving the privacy protection effect. That is to say, in the condition that the first control electrode CE1and the second control electrode CE2are respectively electrically connected with the common voltage Vcom2and the common voltage Vcom3, the liquid crystal display panel10may carry out a narrow viewing angle display mode that has privacy protection function. In the condition that the first control electrode CE1and the second control electrode CE2do not receive any common voltage, the liquid crystal display panel10may carry out a wide viewing angle display mode, namely, a normal display mode.

In the embodiment, the alignment film130aand the alignment film130bare configured to align the liquid crystal molecule (not shown) in the liquid crystal layer120along the first direction D1. That is to say, the alignment direction of the alignment film130aand the alignment film130bis the first direction D1. In the embodiment, when not being driven by the electric field, the liquid crystal molecule (not shown) in the liquid crystal layer120is maintained in a condition that the longitudinal axis is substantially parallel with the first direction D1. In the embodiment, the alignment film130ais disposed on the first substrate100and located between the first substrate100and the liquid crystal layer120. The alignment film130bis disposed on the second substrate110and located between the second substrate110and the liquid crystal layer120.

In the liquid crystal display panel10, with the design that the polarity of first sub-pixel P1is the same as the polarity of the third sub-pixel P3, the polarity of the second sub-pixel P2is different from the polarity of the first sub-pixel P1and the polarity of the third sub-pixel P3, the polarity of the fourth sub-pixel P4is the same as the polarity of the sixth sub-pixel P6, the polarity of the fifth sub-pixel P5is different from the polarity of the fourth sub-pixel P4and the polarity of the sixth sub-pixel P6, the polarity of the fourth sub-pixel P4is different from the polarity of the first sub-pixel P1, the polarity of the first control electrode CE1is different from the polarity of the second control electrode CE2, and in the first direction D1, the extending directions of the slit patterns of any two adjacent ones of the first electrodes PE1, PE2, PE3, PE4, PE5and PE6are different, when the liquid crystal display panel10is in the narrow viewing angle display mode, the liquid crystal molecule that is driven by the vertical electric field deflects in the same deflection direction. In this manner, the display brightness presented at a viewing angle on the left side or right side of the normal viewing angle of the liquid crystal display panel10is reduced significantly, such that the effect of single-sided privacy protection effect can be achieved.

For example, when the liquid crystal display panel10is in the display mode, and the first sub-pixel P1receives a positive voltage which is 9 V, the second sub-pixel P2receives a negative voltage which is 1 V, the third sub-pixel P3receives a positive voltage which is 9 V, the fourth sub-pixel P4receives a negative voltage which is 1 V, the fifth sub-pixel P5receives a positive voltage which is 9 V, the sixth sub-pixel P6receives a negative voltage which is 1 V, the common electrode layer CM receives the common voltage Vcom1which is 5 V, the first control electrode CE1receives positive common voltage Vcom2which is 8 V and the second control electrode CE2receives a negative common voltage Vcom3which is 3 V, a vertical electric field is generated between the first control electrode CE1and the first electrode PE2of the second sub-pixel P2, and a vertical electric field is generated between the second control electrode CE2and the first electrode PE5of the fifth sub-pixel P5. Specifically, since the first electrode PE2and the first electrode PE5have the same construction, and the included angle between the extending direction of each slit pattern St2of the first electrode PE2and the first direction D1is a negative angle, the display brightness presented at the viewing angle on the right side of the normal viewing angle of the liquid crystal display panel10is reduced significantly. In other words, at this time, the user on the right side of the liquid crystal display panel10cannot see the display image clearly, and thus the single-sided privacy protection effect can be achieved.

The situation that the liquid crystal display panel10performs display under the operation condition described above, and the liquid crystal display panel10is capable of achieving the single-sided privacy protection effect accordingly is described following with reference toFIG. 4andFIG. 5.FIG. 4is a diagram illustrating a relationship between a viewing angle of the liquid crystal display panel in the first embodiment at an azimuth angle of 0 degree and a relative transmittance.FIG. 5is a diagram illustrating a relationship between a viewing angle of the liquid crystal display panel in the first embodiment at an azimuth angle of 45 degrees and a relative transmittance. The viewing angle of 0° inFIG. 4andFIG. 5indicates that the included angle between said viewing angle and the front view normal of the liquid crystal display panel10is 0°. The viewing angles of 50° and −50° inFIG. 4andFIG. 5indicate that the included angle between each said viewing angle and the front view normal of the liquid crystal display panel10is 50°. The terms positive and negative are merely used to describe directions, wherein deflection to the right side direction is positive, and deflection to the left side direction is negative. Moreover, the relative transmittance refers to a ratio obtained by dividing the side view viewing angle brightness by the maximum brightness of normal viewing angle.

FIG. 4andFIG. 5show that, at an azimuth angle of 0 degree, the brightness at the left side viewing angle 50° of the liquid crystal display panel10is about 20% higher than the brightness at the right side viewing angle 50° of the liquid crystal display panel10. At an azimuth angle of 45 degrees, the brightness at the left side viewing angle 50° of the liquid crystal display panel10is about 18% higher than the brightness at the right side viewing angle 50° of the liquid crystal display panel10. The result proves that the liquid crystal display panel10is capable of effectively achieving the privacy protection effect at a specific viewing angle.

In another example, when the liquid crystal display panel10is in the display mode, and the first sub-pixel P1receives positive voltage which is 9 V, the second sub-pixel P2receives negative voltage which is 1 V, the third sub-pixel P3receives positive voltage which is 9 V, the fourth sub-pixel P4receives negative voltage which is 1 V, the fifth sub-pixel P5receives positive voltage which is 9 V, the sixth sub-pixel P6receives negative voltage which is 1 V, the common electrode layer CM receives the common voltage Vcom1which is 5 V, the first control electrode CE1receives the negative common voltage Vcom2which is 3 V and the second control electrode CE2receives positive common voltage Vcom3which is 8 V, a vertical electric field is generated between the first control electrode CE1and the first electrode PE1of the first sub-pixel P1, a vertical electric field is generated between the first control electrode CE1and the first electrode PE3of the third sub-pixel P3, a vertical electric field is generated between the second control electrode CE2and the first electrode PE4of the fourth sub-pixel P4, and a vertical electric field is generated between the second control electrode CE2and the first electrode PE6of the sixth sub-pixel P6. Specifically, since the first electrodes PE1, PE3, PE4and PE6have the same construction, and the included angle between the extending direction of each slit pattern SU of the first electrode PE1and the first direction D1is a positive angle, the display brightness presented at the viewing angle on the left side of the normal viewing angle of the liquid crystal display panel10is reduced significantly. That is to say, at this time, the user on the left side of the liquid crystal display panel10cannot see the display image clearly, and thus the effect of single-sided privacy protection can be achieved.

In addition, althoughFIG. 1shows that all of the first electrodes PE1, PE2, PE3, PE4, PE5and PE6include eight branches (e.g., branches E1, E2), which should not be construed as a limitation to the invention. In other embodiment, depending on actual requirement, persons of ordinary skill in the art may adjust the number of branch, and the first electrodes PE1, PE2, PE3, PE4, PE5and PE6respectively fall within the scope of the invention as long as they have at least two branches. That is, the first electrodes PE1, PE2, PE3, PE4, PE5and PE6respectively fall within the scope of the invention as long as they have at least one slit pattern.

Moreover, in the first embodiment, the first electrode (e.g., first electrodes PE1, PE2, PE3, PE4, PE5and PE6) having the slit pattern (e.g., slit patterns St1, St2) serves as the pixel electrode and is electrically connected with the active element (e.g., active elements T1, T2, T3, T4, T5, T6), which should not be construed as a limitation to the invention. In other embodiments, the first electrode having the slit pattern may serve as the common electrode, and the one that is electrically connected with the active element is the second electrode.

Based on the first embodiment, according to an embodiment of the invention, with the design that the liquid crystal display panel includes the first sub-pixel, the second sub-pixel and the third sub-pixel arranged in sequence along the first direction in the first sub-pixel row, the fourth sub-pixel, the fifth sub-pixel and the sixth sub-pixel arranged along the first direction in the second sub-pixel row, the first control electrode that overlaps the first sub-pixel, the second sub-pixel and the third sub-pixel, and the second control electrode that overlaps the fourth sub-pixel, the fifth sub-pixel and the sixth sub-pixel, wherein each of the first sub-pixel, the second sub-pixel, the third sub-pixel, the fourth sub-pixel, the fifth sub-pixel and the sixth sub-pixel includes the first electrode having at least one slit pattern, the fourth sub-pixel and the first sub-pixel are arranged in the second direction that intersects the first direction, the polarity of the first sub-pixel is the same as the polarity of the third sub-pixel, the polarity of the second sub-pixel is different from the polarity of the first sub-pixel and the polarity of the third sub-pixel, the polarity of the fourth sub-pixel is the same as the polarity of the sixth sub-pixel, the polarity of the fifth sub-pixel is different from the polarity of the fourth sub-pixel and the polarity of the sixth sub-pixel, the polarity of the fourth sub-pixel is different from the polarity of the first sub-pixel, the polarity of the first control electrode is different from the polarity of the second control electrode, and in the first direction, the extending directions of at least one slit pattern of any two adjacent ones of the first sub-pixel, the second sub-pixel, the third sub-pixel, the fourth sub-pixel, the fifth sub-pixel and the sixth sub-pixel are different, the liquid crystal display panel is capable of achieving the privacy protection effect at a specific viewing angle.

FIG. 6is a top view illustrating a liquid crystal display panel according to a second embodiment of the invention.FIG. 7is a cross-sectional view taken along line I-I′ inFIG. 6.FIG. 8is an enlarged top view illustrating a first electrode PE7and a first electrode PE8inFIG. 6. Referring toFIG. 6andFIG. 1, a liquid crystal display panel20inFIG. 6is similar to the liquid crystal display panel10inFIG. 1. Therefore, identical or similar elements are denoted by identical or similar symbols, and identical technical content is omitted. The previous embodiments may serve as reference for the omitted descriptions. The differences between the two are described below.

Referring toFIG. 6toFIG. 8, in the embodiment, each of the first sub-pixel P1, the second sub-pixel P2, the third sub-pixel P3, the fourth sub-pixel P4, the fifth sub-pixel P5and the sixth sub-pixel P6includes a first zone Z1and a second zone Z2, wherein the first zone Z1and the second zone Z2are arranged in sequence along the second direction D2.

In the embodiment, the first sub-pixel P1includes a first electrode PE7, the second sub-pixel P2includes a first electrode PE8, the third sub-pixel P3includes a first electrode PE9, the fourth sub-pixel P4includes a first electrode PE10, the fifth sub-pixel P5includes a first electrode PE11, and the sixth sub-pixel P6includes a first electrode PE12. Each of the first electrodes PE7, PE8, PE9, PE10, PE11, PE12is, for example, a transparent conductive layer, and the material thereof includes a metal oxide conductive material such as indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, indium germanium zinc oxide, or other suitable oxide, or a stacked layer of at least two materials mentioned above.

Referring toFIG. 6andFIG. 8, in the embodiment, the first electrode PE7includes a frame C7, and first branches E7aand second branches E7bconnected with the frame C7, wherein a first slit pattern St7ais formed between two adjacent first branches E7a, and a second slit pattern St7bis formed between two adjacent second branches E7b; and the first electrode PE8includes a frame C8and first branches E8aand second branches E8bconnected with the frame C8, wherein a first slit pattern St8ais located between two adjacent first branches E8a, and a second slit pattern St8bis disposed between two adjacent second branches E8b. In other words, in the embodiment, the first electrode PE7and the first electrode PE8are patterned electrodes.

In the embodiment, each first slit pattern St7aof the first electrode PE7is in the first zone Z1but not in the second zone Z2, each first slit pattern St8aof the first electrode PE8is in the first zone Z1but not in the second zone Z2, each second slit pattern St7bof the first electrode PE7is in the second zone Z2but not in the first zone Z1, and each second slit pattern St8bof the first electrode PE8is in the second zone Z2but not in the first zone Z1.

In the embodiment, an included angle θ7abetween an extending direction of each first slit pattern St7aof the first electrode PE7and the first direction D1is larger than 0 degree and smaller than or equal to 45 degrees, an included angle θ7bbetween an extending direction of each second slit pattern St7bof the first electrode PE7and the first direction D1is larger than 0 degree and smaller than or equal to 45 degrees, an included angle θ8abetween an extending direction of each first slit pattern St8aof the first electrode PE8and the first direction D1is larger than 0 degree and smaller than or equal to 45 degrees, an included angle θ8bbetween an extending direction of each second slit pattern St8bof the first electrode PE8and the first direction D1is larger than 0 degree and smaller than or equal to 45 degrees.

In addition, in the descriptions, the first direction D1serves as a basis, the included angle θ7bbetween the extending direction of each second slit pattern St7bof the first electrode PE7and the first direction D1as well as the included angle θ8abetween the extending direction of each first slit pattern St8aof the first electrode PE8and the first direction D1are defined as a positive angle. Meanwhile, the included angle θ7abetween the extending direction of each first slit pattern St7aof the first electrode PE7and the first direction D1as well as the included angle θ8bbetween the extending direction of each second slit pattern St8bof the first electrode PE8and the first direction D1are defined as a negative angle. That is to say, in the embodiment, the extending direction of each first slit pattern St7aof the first electrode PE7is different from the extending direction of each second slit pattern St7b, the extending direction of each first slit pattern St8aof the first electrode PE8is different from the extending direction of each second slit pattern St8b, the extending direction of each first slit pattern St7aof the first electrode PE7is different from the extending direction of each first slit pattern St8aof the first electrode PE8, and the extending direction of each second slit pattern St7bof the first electrode PE7is different from the extending direction of each second slit pattern St8bof the first electrode PE8. In this manner, when being driven by the electric field, the deflection direction of the liquid crystal molecule in the liquid crystal layer120corresponding to each first slit pattern St7aof the first electrode PE7is opposite to the deflection direction of the liquid crystal molecule in the liquid crystal layer120corresponding to each second slit pattern St7bof the first electrode PE7, and the deflection direction of the liquid crystal molecule in the liquid crystal layer120corresponding to each first slit pattern St8aof the first electrode PE8is opposite to the deflection direction of the liquid crystal molecule in the liquid crystal layer120corresponding to each second slit pattern St8bof the first electrode PE8.

Moreover, as shown inFIG. 6, in the embodiment, the first electrodes PE9, PE10, PE12have the same construction as the first electrode PE7, and the first electrode PE11has the same construction as the first electrode PE8. Based on the above, according to the descriptions regarding the first electrode PE7and the first electrode PE8, persons of ordinary skill in the art should be able to understand the detailed structure of the first electrodes PE9, PE10, PE11and PE12; therefore, no further descriptions are incorporated herein. Furthermore, according to the descriptions regarding the first electrode PE7and the first electrode PE8, persons of ordinary skill in the art should be able to understand that the extending direction of each first slit pattern of the first electrode PE9is different from the extending direction of each first slit pattern St8aof the first electrode PE8, the extending direction of each first slit pattern of the first electrode PE10is different from the extending direction of each first slit pattern of the first electrode PE11, and the extending direction of each first slit pattern of the first electrode PE12is different from the extending direction of each first slit pattern of the first electrode PE11. In other words, in the embodiment, in the first direction D1, the extending directions of the first slit patterns of any two adjacent first electrodes are different.

In the embodiment, the liquid crystal display panel20includes a first control electrode CE3, a second control electrode CE4and a third control electrode CE5disposed on the second substrate110. In the embodiment, the first control electrode CE3overlaps the first zone Z1of the first sub-pixel P1, the first zone Z1of the second sub-pixel P2and the first zone Z1of the third sub-pixel P3, the second control electrode CE4overlaps the second zone Z2of the first sub-pixel P1, the second zone Z2of the second sub-pixel P2and the second zone Z2of the third sub-pixel P3, the first zone Z1of the fourth sub-pixel P4, the first zone Z1of the fifth sub-pixel P5and the first zone Z1of the sixth sub-pixel P6, and the third control electrode CE5overlaps the second zone Z2of the fourth sub-pixel P4, the second zone Z2of the fifth sub-pixel P5and the second zone Z2of the sixth sub-pixel P6. That is to say, in the embodiment, the first control electrode CE3, the second control electrode CE4and the third control electrode CE5are arranged in sequence along the second direction D2.

Moreover, in the embodiment, each of the first control electrode CE3, the second control electrode CE4and the third control electrode CE5overlaps two adjacent sub-pixel rows. As shown inFIG. 6, the second control electrode CE4overlaps the first sub-pixel row R1and the second sub-pixel row R2. Although it is not illustrated inFIG. 6, persons of ordinary skill in the art should be able to understand that first control electrode CE3overlaps the first sub-pixel row R1and the sub-pixel row above the first sub-pixel row R1in the second direction D2, and the third control electrode CE5overlaps the second sub-pixel row R2and the sub-pixel row under the second sub-pixel row R2in the second direction D2.

Furthermore, in the embodiment, the polarity of the first control electrode CE3is different from the polarity of the second control electrode CE4, and the polarity of the third control electrode CE5is different from the polarity of the second control electrode CE4. For example, in an embodiment, the first control electrode CE3is electrically connected with the positive voltage, the second control electrode CE4is electrically connected with the negative voltage, and the third control electrode CE5is electrically connected with the positive voltage.

In the embodiment, the first control electrode CE3is electrically connected with a common voltage Vcom4, the second control electrode CE4is electrically connected with a common voltage Vcom5, the third control electrode CE5is electrically connected with a common voltage Vcom6. Based on the above, according to the definition provided in the previous descriptions, when the first control electrode CE3is electrically connected with the positive voltage, the second control electrode CE4is electrically connected with the negative voltage, and the third control electrode CE5is electrically connected with the positive voltage, the common voltage Vcom4is substantially larger than the common voltage Vcom1, the common voltage Vcom5is substantially smaller than the common voltage Vcom1, and the common voltage Vcom6is substantially larger than the common voltage Vcom1.

Moreover, when the liquid crystal display panel20is in the display mode, the first control electrode CE3is electrically connected with the common voltage Vcom4so as to generate a vertical electric field between the first control electrode CE3and at least one of the first electrodes PE7, PE8and PE9in the first zone Z1; the second control electrode CE4is electrically connected with the common voltage Vcom5so as to generate a vertical electric field between the second control electrode CE4and at least one of the first electrodes PE7, PE8, PE9in the second zone Z2along with at least one of the first electrodes PE10, PE11, PE12in the first zone Z1; and the third control electrode CE5is electrically connected with the common voltage Vcom6so as to generate a vertical electric field between the third control electrode CE5and at least one of the first electrodes PE10, PE11, PE12in the second zone Z2.

When the liquid crystal display panel20is in the display mode and the vertical electric field is generated in the liquid crystal display panel20, the longitudinal axis of the liquid crystal molecule (not shown) in the liquid crystal layer120driven by the vertical electric field is approximately perpendicular to the first substrate100and the second substrate110, such that the display brightness presented at the partial side viewing angle is reduced significantly so as to achieve the privacy protection effect. In other words, under the condition that the first control electrode CE3, the second control electrode CE4, and the third control electrode CE5are respectively electrically connected with the common voltage Vcom4, the common voltage Vcom5, and the common voltage Vcom6, the liquid crystal display panel20may carry out the narrow viewing angle display mode having a privacy protection function; and under the condition that the first control electrode CE3, the second control electrode CE4and the third control electrode CE5do not receive any common voltage, the liquid crystal display panel20may carry out the wide viewing angle display mode, namely, a normal display mode.

Based on the first embodiment, it is shown that, in the liquid crystal display panel20, with the design that the polarity of the first sub-pixel P1is the same as the polarity of the third sub-pixel P3, the polarity of the second sub-pixel P2is different from the polarity of the first sub-pixel P1and the polarity of the third sub-pixel P3, the polarity of the fourth sub-pixel P4is the same as the polarity of the sixth sub-pixel P6, the polarity of the fifth sub-pixel P5is different from the polarity of the fourth sub-pixel P4and the polarity of the sixth sub-pixel P6, the polarity of the fourth sub-pixel P4is different from the polarity of the first sub-pixel P1, the polarity of the first control electrode CE3is different from the polarity of the second control electrode CE4, the polarity of the third control electrode CE5is different from the polarity of the second control electrode CE4, the extending direction of each first slit pattern of each of the first electrodes PE7, PE8, PE9, PE10, PE11, PE12is different from the extending direction of each second slit pattern of each of the first electrodes PE7, PE8, PE9, PE10, PE11, PE12, and in the first direction D1, the extending directions of the first slit patterns of any two adjacent ones of the first electrodes PE7, PE8, PE9, PE10, PE11, PE12are different, when the liquid crystal display panel20is in the narrow viewing angle display mode, the liquid crystal molecule driven by the vertical electric field deflects in the same deflection direction. Accordingly, the display brightness presented at the viewing angle on the left side or right side of the normal viewing angle of the liquid crystal display panel20is reduced significantly, such that the single-sided privacy protection effect can be attained.

For example, when the liquid crystal display panel20is in the display mode, and in the condition that the first sub-pixel P1receives negative voltage which is 1 V, the second sub-pixel P2receives positive voltage which is 9 V, the third sub-pixel P3receives the negative voltage which is 1 V, the fourth sub-pixel P4receives positive voltage which is 9 V, the fifth sub-pixel P5receives negative voltage which is 1V, the sixth sub-pixel P6receives positive voltage which is 9 V, the common electrode layer CM receives the common voltage Vcom1which is 5 V, the first control electrode CE3receives positive common voltage Vcom4which is 8 V, the second control electrode CE4receives negative common voltage Vcom5which is 3 V and the third control electrode CE5receives the positive common voltage Vcom6which is 8 V, a vertical electric field is generated between the first control electrode CE3and the first electrode PE7of the first sub-pixel P1in the first zone Z1, a vertical electric field is generated between the first control electrode CE3and the first electrode PE9of the third sub-pixel P3in the first zone Z1, a vertical electric field is generated between the second control electrode CE4and the first electrode PE8of the second sub-pixel P2in the second zone Z2, a vertical electrical field is generated between the second control electrode CE4and the first electrode PE10of the fourth sub-pixel P4in the first zone Z1, a vertical electrical field is generated between the second control electrode CE4and the first electrode PE12of the sixth sub-pixel P6in the first zone Z1, and a vertical electric field is generated between the third control electrode CE5and the first electrode PE11of the fifth sub-pixel P5in the second zone Z2. Furthermore, since the first electrodes PE9, PE10, PE12have the same construction as the first electrode PE7, the first electrode PE11has the same construction as the first electrode PE8, and the included angle between the extending direction of each first slit pattern St7aof the first electrode PE7in the first zone Z1and the first direction D1as well as the included angle between the extending direction of each second slit pattern St8bof the first electrode PE8in the second zone Z2and the first direction D1are negative angles, the display brightness presented at the viewing angle on the right side of the normal viewing angle of the liquid crystal display panel20is reduced significantly. In other words, at this time, the user on the right side of the liquid crystal display panel20cannot see the display image clearly, such that the single-sided privacy protection effect can be attained.

In still another example, when the liquid crystal display panel20is in the display mode, and in the condition that the first sub-pixel P1receives the negative voltage which is 1 V, the second sub-pixel P2receives positive voltage which is 9 V, the third sub-pixel P3receives negative voltage which is 1 V, the fourth sub-pixel P4receives positive voltage which is 9 V, the fifth sub-pixel P5receives negative voltage which is 1 V, the sixth sub-pixel P6receives positive voltage which is 9 V, the common electrode layer CM receives common voltage Vcom1which is 5 V, the first control electrode CE3receives negative common voltage Vcom4which is 3 V, the second control electrode CE4receives the positive common voltage Vcom5which is 8 V and the third control electrode CE5receives negative common voltage Vcom6which is 3 V, a vertical electric field is generated between the first control electrode CE3and the first electrode PE8of the second sub-pixel P2in the first zone Z1, a vertical electric field is generated between the second control electrode CE4and the first electrode PE7of the first sub-pixel P1in the second zone Z2, a vertical electric field is generated between the second control electrode CE4and the first electrode PE9of the third sub-pixel P3in the second zone Z2, a vertical electric field is generated between the second control electrode CE4and the first electrode PE11of the fifth sub-pixel P5in the first zone Z1, a vertical electric field is generated between the third control electrode CE5and the first electrode PE10of the fourth sub-pixel P4in the second zone Z2, and a vertical electric field is generated between the third control electrode CE5and the first electrode PE12of the sixth sub-pixel P6in the first zone Z2. Specifically, since the first electrodes PE9, PE10, PE12have the same construction as the first electrode PE7, the first electrode PE11has the same construction as the first electrode PE8, and the included angle between the extending direction of each second slit pattern St7bof the first electrode PE7in the second zone Z2and the first direction D1as well as the included angle between the extending direction of each first slit pattern St8aof the first electrode PE8in the first zone Z1and the first direction D1are positive angle, the display brightness presented at the viewing angle on the left side of the normal viewing angle of the liquid crystal display panel20is reduced significantly. That is to say, at this time, the user on the left side of the liquid crystal display panel20cannot see the display image clearly, such that the single-sided privacy protection effect can be attained.

Also, in the second embodiment, each of the first control electrode CE3, the second control electrode CE4and the third control electrode CE5overlaps two adjacent sub-pixel rows, which should not be construed as a limitation to the invention. In other embodiment, the first control electrode, the second control electrode and the third control electrode may only overlap one sub-pixel row. The detailed embodiment is described below with reference toFIG. 9.

FIG. 9is a top view illustrating a liquid crystal display panel according to a third embodiment of the invention.FIG. 10is a cross-sectional view taken along line I-I′ inFIG. 9. Referring toFIG. 9andFIG. 6, a liquid crystal display panel30inFIG. 9is similar to the liquid crystal display panel20inFIG. 6; therefore, identical or similar elements are denoted by identical or similar symbols. Meanwhile, identical technical content is omitted. The previous embodiments may serve as reference for the omitted descriptions. The differences between the two are described below.

Referring toFIG. 9andFIG. 10, in the embodiment, the liquid crystal display panel30includes a first control electrode CE6, a second control electrode CE7, a third control electrode CE8and a fourth control electrode CE9are disposed on the second substrate110. In the embodiment, the first control electrode CE6overlaps the first zone Z1of the first sub-pixel P1, the first zone Z1of the second sub-pixel P2and the first zone Z1of the third sub-pixel P3, the second control electrode CE7overlaps the second zone Z2of the first sub-pixel P1, the second zone Z2of the second sub-pixel P2and the second zone Z2of the third sub-pixel P3, the third control electrode CE8overlaps the second zone Z2of the fourth sub-pixel P4, the second zone Z2of the fifth sub-pixel P5and the second zone Z2of the sixth sub-pixel P6, and the fourth control electrode CE9overlaps the first zone Z1of the fourth sub-pixel P4, the first zone Z1of the fifth sub-pixel P5and the first zone Z1of the sixth sub-pixel P6. In other words, in the embodiment, the first control electrode CE6, the second control electrode CE7, the fourth control electrode CE9and the third control electrode CE8are arranged in sequence in the second direction D2, and each of the first control electrode CE6, the second control electrode CE7, the fourth control electrode CE9and the third control electrode CE8only overlaps one sub-pixel row. The first control electrode CE6and the second control electrode CE7respectively only overlap the first sub-pixel row R1, and the fourth control electrode CE9and the third control electrode CE8respectively only overlap the second sub-pixel row R2.

In the embodiment, the polarity of the first control electrode CE6is different from the polarity of the second control electrode CE7, the polarity of the third control electrode CE8is different from the polarity of the fourth control electrode CE9, and the polarity of the third control electrode CE8may be the same as or different from the polarity of the second control electrode CE7. For example, in an embodiment, the first control electrode CE6is electrically connected with the positive voltage, the second control electrode CE7is electrically connected with the negative voltage, the third control electrode CE8is electrically connected with the positive voltage, and the fourth control electrode CE9is electrically connected with the negative voltage; in another embodiment, the first control electrode CE6is electrically connected with the positive voltage, the second control electrode CE7is electrically connected with the negative voltage, the third control electrode CE8is electrically connected with the negative voltage, and the fourth control electrode CE9is electrically connected with the positive voltage.

In the embodiment, the first control electrode CE6is electrically connected with a common voltage Vcom7, the second control electrode CE7is electrically connected with a common voltage Vcom8, the third control electrode CE8is electrically connected with a common voltage Vcom9, the fourth control electrode CE9is electrically connected with a common voltage Vcom10. Based on the above, according to the definition provided in the previous descriptions, when the first control electrode CE6is electrically connected with the positive voltage, the second control electrode CE7is electrically connected with the negative voltage, the third control electrode CE8is electrically connected with the positive voltage, and the fourth control electrode CE9is electrically connected with the negative voltage, the common voltage Vcom7is substantially larger than the common voltage Vcom1, the common voltage Vcom8is substantially smaller than the common voltage Vcom1, the common voltage Vcom9is substantially larger than the common voltage Vcom1, and the common voltage Vcom10is substantially smaller than the common voltage Vcom1.

In addition, when the liquid crystal display panel30is in the display mode, the first control electrode CE6is electrically connected with the common voltage Vcom7so as to generate a vertical electric field between the first control electrode CE6and at least one of the first electrodes PE7, PE8, PE9in the first zone Z1; the second control electrode CE7is electrically connected with the common voltage Vcom8so as to generate a vertical electrical field between the second control electrode CE7and at least one of the first electrodes PE7, PE8, PE9in the second zone Z2; the third control electrode CE8is electrically connected with the common voltage Vcom9so as to generate a vertical electric field between the third control electrode CE8and at least one of the first electrodes PE10, PE11, PE12in the second zone Z2; and the fourth control electrode CE9is electrically connected with the common voltage Vcom10so as to generate a vertical electric field between the fourth control electrode CE9and at least one of the first electrodes PE10, PE11, PE12in the first zone Z1.

When the liquid crystal display panel30is in the display mode and the vertical electric field is generated in the liquid crystal display panel30, the longitudinal axis of the liquid crystal molecule (not shown) in the liquid crystal layer120driven by the vertical electric field is approximately perpendicular to the first substrate100and the second substrate110, such that the display brightness presented at partial or all side viewing angles is reduced significantly, thereby achieving the privacy protection effect. In other words, under the condition that the first control electrode CE6, the second control electrode CE7, the third control electrode CE8and the fourth control electrode CE9are respectively electrically connected with the common voltage Vcom7, the common voltage Vcom8, the common voltage Vcom9and the common voltage Vcom10, the liquid crystal display panel30may carry out the narrow viewing angle display mode having the privacy protection function; and under the condition that the first control electrode CE6, the second control electrode CE7, the third control electrode CE8and the fourth control electrode CE9do not receive any common voltage, the liquid crystal display panel30may carry out the wide viewing angle display mode, namely, a normal display mode.

Based on the descriptions in the first and the second embodiments, it can be known that in the liquid crystal display panel30, with the design that the polarity of the first sub-pixel P1is the same as the polarity of the third sub-pixel P3, the polarity of the second sub-pixel P2is different from the polarity of the first sub-pixel P1and the polarity of the third sub-pixel P3, the polarity of the fourth sub-pixel P4is the same as the polarity of the sixth sub-pixel P6, the polarity of the fifth sub-pixel P5is different from the polarity of the third sub-pixel P3and the polarity of the sixth sub-pixel P6, the polarity of the fourth sub-pixel P4is different from the polarity of the first sub-pixel P1, the polarity of the first control electrode CE6is different from the polarity of the second control electrode CE7, the polarity of the third control electrode CE8is different from the polarity of the second control electrode CE7, the polarity of the third control electrode CE8is different from the polarity of the fourth control electrode CE9, the extending direction of each first slit pattern in each of the first electrodes PE7, PE8, PE9, PE10, PE11, PE12is different from the extending direction of each second slit pattern in each of the first electrodes PE7, PE8, PE9, PE10, PE11, PE12, and in the first direction D1, the extending directions of the first slit patterns of any two adjacent ones of the first electrodes PE7, PE8, PE9, PE10, PE11, PE12are different, when the liquid crystal display panel30is in the narrow viewing angle display mode, the liquid crystal molecule driven by the vertical electric field deflects in the same deflection direction. In this manner, the display brightness presented at the viewing angle on the left side or right side of the normal viewing angle of the liquid crystal display panel30is reduced significantly, thereby achieving the single-sided privacy protection effect.

For example, when the liquid crystal display panel30is in the display mode, and in the condition that the first sub-pixel P1receives the negative voltage which is 1 V, the second sub-pixel P2receives the positive voltage which is 9 V, the third sub-pixel P3receives the negative voltage which is 1 V, the fourth sub-pixel P4receives the positive voltage which is 9 V, the fifth sub-pixel P5receives the negative voltage which is 1 V, the sixth sub-pixel P6receives the positive voltage which is 9 V, the common electrode layer CM receives the common voltage Vcom1which is 5 V, the first control electrode CE6receives the positive common voltage Vcom7which is 8 V, the second control electrode CE7receives the negative common voltage Vcom8which is 3 V, the third control electrode CE8receives the positive common voltage Vcom9which is 8 V and the fourth control electrode CE9receives the negative common voltage Vcom10which is 3 V, a vertical electric field is generated between the first control electrode CE6and first electrode PE7of the first sub-pixel P1in the first zone Z1, a vertical electric field is generated between the first control electrode CE6and the first electrode PE9of the third sub-pixel P3in the first zone Z1, a vertical electric field is generated between the second control electrode CE7and the first electrode PE8of the second sub-pixel P2in the second zone Z2, a vertical electric field is generated between the fourth control electrode CE9and the first electrode PE10of the fourth sub-pixel P4in the first zone Z1, a vertical electric field is generated between the fourth control electrode CE9and the first electrode PE12of the sixth sub-pixel P6in the first zone Z1, and a vertical electric field is generated between the third control electrode CE8and the first electrode PE11of the fifth sub-pixel P5in the second zone Z2. Specifically, since the first electrodes PE9, PE10, PE12have the same construction as the first electrode PE7, the first electrode PE11has the same construction as the first electrode PE8, and the included angle between the extending direction of each first slit pattern St7aof the first electrode PE7in the first zone Z1and the first direction D1as well as the included angle between the extending direction of each second slit pattern St8bof the first electrode PE8in the second zone Z2and the first direction D1are negative angles, the display brightness presented at the viewing angle on the right side of the normal viewing angle of the liquid crystal display panel30is reduced significantly. That is to say, at this time, the user on the right side of the liquid crystal display panel30cannot see the display image clearly, and thus the single-sided privacy protection effect can be achieved.

In another example, when the liquid crystal display panel30is in the display mode, and in the condition that the first sub-pixel P1receives the negative voltage which is 1 V, the second sub-pixel P2receives positive voltage which is 9 V, the third sub-pixel P3receives the negative voltage which is 1 V, the fourth sub-pixel P4receives the positive voltage which is 9 V, the fifth sub-pixel P5receives the negative voltage which is 1 V, the sixth sub-pixel P6receives the positive voltage which is 9 V, the common electrode layer CM receives the common voltage Vcom1which is 5 V, the first control electrode CE6receives the negative common voltage Vcom7which is 3 V, the second control electrode CE7receives the positive common voltage Vcom8which is 8 V, the third control electrode CE8receives the negative common voltage Vcom9which is 3 V and the fourth control electrode CE9receives the positive common voltage Vcom10which is 8 V, a vertical electric field is generated between the first control electrode CE6and the first electrode PE8of the second sub-pixel P2in the first zone Z1, a vertical electric field is generated between the second control electrode CE7and the first electrode PE7of the first sub-pixel P1in the second zone Z2, a vertical electric field is generated between the second control electrode CE7and the first electrode PE9of the third sub-pixel P3in the second zone Z2, a vertical electric field is generated between the fourth control electrode CE9and the first electrode PE11of the fifth sub-pixel P5in the first zone Z1, a vertical electric field is generated between the third control electrode CE8and the first electrode PE10of the fourth sub-pixel P4in the second zone Z2, and a vertical electric field is generated between the third control electrode CE8and the first electrode PE12of the sixth sub-pixel P6in the second zone Z2. Furthermore, since the first electrodes PE9, PE10, PE12have the same construction as the first electrode PE7, the first electrode PE11has the same construction as the first electrode PE8, and the included angle between the extending direction of each second slit pattern St7bof the first electrode PE7in the second zone Z2as well as the extending direction of each first slit pattern St8aof the first electrode PE8in the first zone Z1and the first direction D1is a positive angle, the display brightness presented at the viewing angle on the left side of the normal viewing angle of the liquid crystal display panel30is reduced significantly. That is to say, at this time, the user on the left side of the liquid crystal display panel30cannot see the display image clearly, and thus the single-sided privacy protection effect can be attained.

Furthermore, based on the descriptions in the first and the second embodiments, it can be known that in the liquid crystal display panel30, with the design that the polarity of first sub-pixel P1is the same as the polarity of the third sub-pixel P3, the polarity of the second sub-pixel P2is different from the polarity of the first sub-pixel P1and the polarity of the third sub-pixel P3, the polarity of the fourth sub-pixel P4is the same as the polarity of the sixth sub-pixel P6, the polarity of the fifth sub-pixel P5is different from the polarity of the fourth sub-pixel P4and the polarity of the sixth sub-pixel P6, the polarity of the fourth sub-pixel P4is different from the polarity of the first sub-pixel P1, the polarity of the first control electrode CE3is different from the polarity of the second control electrode CE4, the polarity of the third control electrode CE5is the same as the polarity of the second control electrode CE4, the polarity of the third control electrode CE8is different from the polarity of the fourth control electrode CE9, the extending direction of each first slit pattern in each of the first electrodes PE7, PE8, PE9, PE10, PE11, PE12is different from the extending direction of each second slit pattern in each of the first electrodes PE7, PE8, PE9, PE10, PE11, PE12, and in the first direction D1, the extending directions of the first slit patterns of any two adjacent ones of the first electrodes PE7, PE8, PE9, PE10, PE11, PE12are different, when the liquid crystal display panel30is in the narrow viewing angle display mode, a portion of the liquid crystal molecules driven by the vertical electric field deflect in a clock-wise deflection direction, and another portion of the liquid crystal molecules deflect in a counter-clock wise deflection direction. In this manner, the display brightness presented at the viewing angle on the left side and right side of the normal viewing angle of the liquid crystal display panel30is reduced significantly, and thus the double-sided privacy protection effect can be achieved. That is, in the third embodiment, through adjusting the polarity relationship between the third control electrode CE5and the second control electrode CE4, the liquid crystal display panel30can selectively exhibit different display brightness in the viewing angle on both sides of the normal viewing angle under the narrow viewing angle display mode, such that the privacy protection effect at specific viewing angle can be achieved.

For example, when the liquid crystal display panel30is in the display mode, and in the condition that the first sub-pixel P1receives the negative voltage which is 1 V, the second sub-pixel P2receives the positive voltage which is 9 V, the third sub-pixel P3receives the negative voltage which is 1 V, the fourth sub-pixel P4receives the positive voltage which is 9 V, the fifth sub-pixel P5receives the negative voltage which is 1 V, the sixth sub-pixel P6receives the positive voltage which is 9 V, the common electrode layer CM receives the common voltage Vcom1which is 5 V, the first control electrode CE6receives the positive common voltage Vcom7which is 8 V, the second control electrode CE7receives the negative common voltage Vcom8which is 3 V, the third control electrode CE8receives the negative common voltage Vcom9which is 3 V and the fourth control electrode CE9receives the positive common voltage Vcom10which is 8 V, a vertical electric field is generated between the first control electrode CE6and the first electrode PE7of the first sub-pixel P1in the first zone Z1, a vertical electric field is generated between the first control electrode CE6and the first electrode PE9of the third sub-pixel P3in the first zone Z1, a vertical electric field is generated between the second control electrode CE7and the first electrode PE8of the second sub-pixel P2in the second zone Z2, a vertical electric field is generated between the fourth control electrode CE9and the first electrode PE11of the fifth sub-pixel P5in the first zone Z1, a vertical electric field is generated between the third control electrode CE8and the first electrode PE10of the fourth sub-pixel P4in the second zone Z2, and a vertical electric field is generated between the third control electrode CE8and the first electrode PE12of the sixth sub-pixel P6in the second zone Z2. Furthermore, since the first electrodes PE9, PE10, PE12have the same construction as the first electrode PE7, the first electrode PE11has the same construction as the first electrode PE8, and the included angle between the extending direction of each first slit pattern St7aof the first electrode PE7in the first zone Z1and the first direction D1as well as the included angle between the extending direction of each second slit pattern St8bof the first electrode PE8in the second zone Z2and the first direction D1are negative angles, and the included angle between the extending direction of each second slit pattern St7bof the first electrode PE7in the second zone Z2and the first direction D1as well as the included angle between the extending direction of each first slit pattern St8aof the first electrode PE8in the first zone Z1and the first direction D1are positive angles, the display brightness presented at the viewing angle on both sides of the normal viewing angle of the liquid crystal display panel30is reduced significantly. In other words, at this time, the user on both sides of the liquid crystal display panel30cannot see the display image clearly and thus the double-sided privacy protection effect can be attained.

Based on the second and the third embodiments, in an embodiment of the invention, with the design that the liquid crystal display panel includes the first sub-pixel, the second sub-pixel and the third sub-pixel arranged in sequence along the first direction in the first sub-pixel row, the first control electrode and the second control electrode overlapping the first sub-pixel, the second sub-pixel and the third sub-pixel, wherein each of the first sub-pixel, the second sub-pixel and the third sub-pixel includes the first electrode having at least one first slit pattern and at least one second slit pattern as well as the first region and the second region arranged in the second direction that intersects the first direction, the at least one first slit pattern and the at least one second slit pattern are respectively located in the first region and the second region, the polarity of the first sub-pixel is the same as the polarity of the third sub-pixel, the polarity of the second sub-pixel is different from the polarity of the first sub-pixel and the polarity of the third sub-pixel, the first control electrode and the second control electrode respectively overlap the first region and the second region, the polarity of the first control electrode is different from the polarity of the second control electrode, the extending direction of the at least one first slit pattern is different from the extending direction of the at least one second slit pattern, and in the first direction, the extending directions of the at least one first slit pattern of any two adjacent ones of the first sub-pixel, the second sub-pixel and the third sub-pixel are different, the liquid crystal display panel is capable of achieving the privacy protection effect at the specific viewing angle.

Although the invention has been disclosed by the above embodiments, the embodiments are not intended to limit the invention. It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the invention without departing from the scope or spirit of the invention. Therefore, the protecting range of the invention falls in the appended claims.