Liquid crystal display panel and pixel unit thereof

A pixel unit is provided and has a peripheral border surrounding a pixel electrode; a main electrode connected with the peripheral border and having a horizontal main electrode together with a longitudinal main electrode being cross-shaped; and branch electrodes connected with the peripheral border and the main electrode. The horizontal main electrode has a first through hole and the longitudinal main electrode has a second through hole. The first through hole and the second through hole in communication with each other, such that the main electrode forms a cross-ring shape.

FIELD OF THE DISCLOSURE

The present disclosure relates to the technical field of displays, and more particularly to a liquid crystal display panel and a pixel unit thereof.

BACKGROUND OF THE DISCLOSURE

In liquid crystal display technologies, HVA (PSVA) mode is one of many modes. A pixel structure of the HVA mode does not require protrusions and has greater advantages than PVA and MVA, such as reduced number of process of the protrusions, reduced topography effects caused by the protrusions, and reduced effect of particles caused by the protrusions.

To solve viewing angles of the VA mode, a normal pixel design of HVA is same to those of other VA modes, which a pixel region is divided into a plurality of domains. In general, the plurality of domains are four.FIG. 4is a pixel structural diagram of the conventional HVA. A cross-shaped main electrode401is in a middle of the pixel electrode, i.e., a boundary between the domains, which is also a place causing dark fringes. The dark fringes are inevitably induced between the domains due to inverse of tilting direction of the liquid crystals. The dark fringes are induced by conflict of the tilting direction of the liquid crystals. However, tilting of the liquid crystals is also affected by topography, so the appearance of the dark fringes can be irregular.

From the above, in the conventional pixel structure, due to the tilting direction of the liquid crystals in a region corresponding to the cross-shaped main electrode being reversed, the dark fringes are inevitably induced so as to affect performance of display devices.

SUMMARY OF THE DISCLOSURE

The present disclosure provides a liquid crystal display panel and a pixel unit thereof, which can decrease production of dark fringes at a cross-shaped main electrode of a pixel electrode, so as to raise properties of display devices.

To solve the above problem, a technical solution provided by the present disclosure is as follows:The present disclosure provides a pixel unit including:a peripheral border surrounding a pixel electrode;a main electrode connected with the peripheral border and being cross-shaped, wherein the main electrode includes a horizontal main electrode and a longitudinal main electrode perpendicular to each other, and the horizontal main electrode and the longitudinal main electrode divide the pixel electrode into four domains;branch electrodes, an end of each of the branch electrodes is connected with the peripheral border, another opposite end is connected with the horizontal main electrode or the longitudinal main electrode;wherein, in one of the domains of the pixel electrode, the branch electrodes are arranged parallel to each other and spaced from each other, and each of the branch electrodes is connected with the horizontal main electrode or the longitudinal main electrode at a first predetermined angle;wherein a first branch electrode is parallel to a fourth branch electrode, a second branch electrode is parallel to a third branch electrode, and a second predetermined angle is between the first branch electrode and the third branch electrode;wherein the horizontal main electrode has a first through hole and the longitudinal main electrode has a second through hole, the first through hole and the second through hole in communication with each other, such that the main electrode forms a cross-ring shape; andwherein a hollow structure is located at a center of intersection of the horizontal main electrode and the longitudinal main electrode, and the first sub-pixel electrode, the second sub-pixel electrode, the third sub-pixel electrode, and the fourth sub-pixel electrode are connected with each other by the peripheral border.

According to one preferred embodiment of the present disclosure, the pixel unit further includes a light shielding metal layer and a common electrode, wherein the light shielding metal layer has a light shielding electrode, wherein a horizontal light shielding electrode corresponds to the horizontal main electrode, a longitudinal light shielding electrode corresponds to the longitudinal main electrode, and the horizontal light shielding electrode and the longitudinal light shielding electrode are both connected with the common electrode.

According to one preferred embodiment of the present disclosure, a projection of the horizontal light shielding electrode at the pixel electrode covers the first through hole, and a projection of the longitudinal light shielding electrode at the pixel electrode covers the second through hole.

According to one preferred embodiment of the present disclosure, a width of the horizontal light shielding electrode is same as a width of the longitudinal light shielding electrode.

According to one preferred embodiment of the present disclosure, the first through hole extends in an extending direction along the horizontal main electrode from an end of the horizontal main electrode to another end of the horizontal main electrode, and the second through hole extends in an extending direction along the longitudinal main electrode from an end of the longitudinal main electrode to another end of the longitudinal main electrode; and wherein the first through hole and the second through hole divide the pixel electrode into a first sub-pixel electrode, a second sub-pixel electrode, a third sub-pixel electrode, and a fourth sub-pixel electrode.

According to one preferred embodiment of the present disclosure, first main sub-electrodes in a region of the first through hole of the horizontal main electrode extend in an extending direction along the branch electrodes until the first main sub-electrodes intersect, and second main sub-electrodes in a region of the second through hole of the longitudinal main electrode extend in an extending direction along the branch electrodes until the second main sub-electrodes intersect.

According to one preferred embodiment of the present disclosure, the first main sub-electrodes and the second main sub-electrodes overlap at an intersection of the horizontal main electrode and the longitudinal main electrode.

According to one preferred embodiment of the present disclosure, a fifth sub-pixel electrode extends from an end of the horizontal main electrode to the peripheral border outwardly, and in a corresponding region of the fifth sub-pixel electrode corresponding to the horizontal main electrode, the pixel electrode is connected with a switching unit through a third through hole.

The present disclosure further provides a liquid crystal display panel including the pixel unit described above.

The present disclosure further provides a pixel unit including:a peripheral border surrounding a pixel electrode;a main electrode connected with the peripheral border and being cross-shaped, wherein the main electrode includes a horizontal main electrode and a longitudinal main electrode perpendicular to each other, and the horizontal main electrode and the longitudinal main electrode divide the pixel electrode into four domains;branch electrodes, an end of each of the branch electrodes is connected with the peripheral border, another opposite end is connected with the horizontal main electrode or the longitudinal main electrode;wherein, in one of the domains of the pixel electrode, the branch electrodes are arranged parallel to each other and spaced from each other, and each of the branch electrodes is connected with the horizontal main electrode or the longitudinal main electrode at a first predetermined angle;wherein a first branch electrode is parallel to a fourth branch electrode, a second branch electrode is parallel to a third branch electrode, and a second predetermined angle is between the first branch electrode and the third branch electrode; andwherein the horizontal main electrode has a first through hole and the longitudinal main electrode has a second through hole, the first through hole and the second through hole in communication with each other, such that the main electrode forms a cross-ring shape.

According to one preferred embodiment of the present disclosure, the pixel unit further includes a light shielding metal layer and a common electrode, wherein the light shielding metal layer has a light shielding electrode, wherein a horizontal light shielding electrode corresponds to the horizontal main electrode, a longitudinal light shielding electrode corresponds to the longitudinal main electrode, and the horizontal light shielding electrode and the longitudinal light shielding electrode are both connected with the common electrode.

According to one preferred embodiment of the present disclosure, a projection of the horizontal light shielding electrode at the pixel electrode covers the first through hole, and a projection of the longitudinal light shielding electrode at the pixel electrode covers the second through hole.

According to one preferred embodiment of the present disclosure, a width of the horizontal light shielding electrode is same as a width of the longitudinal light shielding electrode.

According to one preferred embodiment of the present disclosure, the first through hole extends in an extending direction along the horizontal main electrode from an end of the horizontal main electrode to another end of the horizontal main electrode, and the second through hole extends in an extending direction along the longitudinal main electrode from an end of the longitudinal main electrode to another end of the longitudinal main electrode; and wherein the first through hole and the second through hole divide the pixel electrode into a first sub-pixel electrode, a second sub-pixel electrode, a third sub-pixel electrode, and a fourth sub-pixel electrode.

According to one preferred embodiment of the present disclosure, first main sub-electrodes in a region of the first through hole of the horizontal main electrode extend in an extending direction along the branch electrodes until the first main sub-electrodes intersect, and second main sub-electrodes in a region of the second through hole of the longitudinal main electrode extend in an extending direction along the branch electrodes until the second main sub-electrodes intersect.

According to one preferred embodiment of the present disclosure, the first main sub-electrodes and the second main sub-electrodes overlap at an intersection of the horizontal main electrode and the longitudinal main electrode.

According to one preferred embodiment of the present disclosure, a fifth sub-pixel electrode extends from an end of the horizontal main electrode to the peripheral border outwardly, and in a corresponding region of the fifth sub-pixel electrode corresponding to the horizontal main electrode, the pixel electrode is connected with a switching unit through a third through hole.

The beneficial effects of the present disclosure are that: compared with a pixel unit of the conventional technology, in the pixel unit of the present disclosure, a hollowing process is correspondingly performed on a cross-shaped main electrode of a pixel electrode, such that the main electrode forms a hollow and cross-ring structure. The corresponding hollowed region of the main electrode forms a topography with grooves so as to cause liquid crystals having a certain orientation. The irregular dark fringes will not be induced by an interaction of different tilting directions of the liquid crystals in the corresponding hollowed region. Further, an electric field strength is decreased in the corresponding hollowed region of the cross-shape main electrode of the pixel electrode, and the effect of the electric field on the liquid crystals is also decreased, such that the tilting conflict of liquid crystals between the different sub-pixel electrodes divided by the main electrode will also be decreased. Therefore, the effect of the dark fringes is greatly reduced.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present disclosure focuses on the technical problem that, in the conventional pixel structure, due to the tilting direction of the liquid crystals in a region corresponding to the cross-shaped main electrode being reversed, the dark fringes are inevitably induced so as to affect performance of display devices. The present embodiment can solve the drawback.

A liquid crystal display panel and a pixel unit thereof provided by a specific embodiment of the present disclosure will be described in detail below with reference to the accompanying drawings.

As shown inFIG. 1, which is a structural schematic diagram of a pixel unit provided by embodiment 1 of the present disclosure, the pixel unit includes: a peripheral border101surrounding a pixel electrode; a main electrode120connected with the peripheral border101and being cross-shaped, where the main electrode120includes a horizontal main electrode102and a longitudinal main electrode103perpendicular to each other, and the horizontal main electrode102and the longitudinal main electrode103divide the pixel electrode into four domains; branch electrodes, where an end of each of the branch electrodes is connected with the peripheral border101, another opposite end is connected with the horizontal main electrode102or the longitudinal main electrode103. In one of the domains of the pixel electrode, the branch electrodes are arranged parallel to each other and spaced from each other, and each of the branch electrodes is connected with the horizontal main electrode102or the longitudinal main electrode103at a first predetermined angle. The first predetermined angle is preferably at an angle between 10 degrees and 80 degrees. A first branch electrode104is parallel to a fourth branch electrode107, a second branch electrode105is parallel to a third branch electrode106, and a second predetermined angle is between the first branch electrode104and the third branch electrode106. The second predetermined angle is preferably at an angle between 60 degrees and 120 degrees. The horizontal main electrode102has a first through hole108and the longitudinal main electrode103has a second through hole109. The first through hole108and the second through hole109in communication with each other, such that the main electrode120forms a cross-ring shape.

The pixel unit further includes a light shielding metal layer and a common electrode, where the light shielding metal layer has a light shielding electrode, where a horizontal light shielding electrode (not shown) corresponds to the horizontal main electrode102, a longitudinal light shielding electrode110corresponds to the longitudinal main electrode103, and the horizontal light shielding electrode and the longitudinal light shielding electrode110are both connected with the common electrode. A projection of the horizontal light shielding electrode at the pixel electrode covers the first through hole108, and a projection of the longitudinal light shielding electrode110at the pixel electrode covers the second through hole109. A width of the horizontal light shielding electrode is same as a width of the longitudinal light shielding electrode110.

The first through hole108extends in an extending direction along the horizontal main electrode102from an end of the horizontal main electrode102to another end of the horizontal main electrode102, and the second through hole109extends in an extending direction along the longitudinal main electrode103from an end of the longitudinal main electrode103to another end of the longitudinal main electrode103. The first through hole108and the second through hole109divide the pixel electrode into a first sub-pixel electrode, a second sub-pixel electrode, a third sub-pixel electrode, and a fourth sub-pixel electrode. A fifth sub-pixel electrode111extends from an end of the horizontal main electrode102to the peripheral border101outwardly, and in a corresponding region of the fifth sub-pixel electrode111corresponding to the horizontal main electrode102, the pixel electrode is connected with a switching unit112through a third through hole (nor shown). The light shielding metal layer further includes a metal light-shielding layer113. An area of the metal light-shielding layer113is greater than an area of the fifth sub-pixel electrode111. The metal light-shielding layer113is used to shield the fifth sub-pixel electrode111and the peripheral border101neighboring a side of the switching unit112.

A position corresponding to the first through hole108and the second through hole109forms a topography with grooves so as to cause liquid crystals to have a certain orientation. The irregular dark fringes will not be induced by an interaction of different tilting directions of the liquid crystals in the corresponding hollowed region. Further, due to the main electrode120of the pixel electrode being a hollow and cross-ring structure, an electric field strength is decreased in the main electrode120, and the effect of the electric field on the liquid crystals is also decreased. The tilting conflict of liquid crystals of the main electrode120between different sub-pixels will also be decreased, thereby reducing the effect of the dark fringes.

In the embodiment, the first through hole108and the second through hole109can also be formed and distributed with intervals. For example, number of the first through holes108is at least two. The first through holes108are formed with intervals in a row in an extending direction along the horizontal main electrode102, or the first through holes108are formed with intervals in a column and are vertical to the horizontal main electrode102, or the first through holes108are formed with intervals in sets of columns. The second through holes109are distributed in the same manner as the first through holes108, and are not described herein again.

As shown inFIG. 2, which is a structural schematic diagram of a pixel electrode provided by embodiment 1 of the present disclosure, a peripheral border201surrounds the pixel electrode. The pixel electrode includes a horizontal main electrode202and a longitudinal main electrode204being perpendicular to each other and having a cross shape. The horizontal main electrode202includes a first through hole203and the longitudinal main electrode204has a second through hole205. The first through hole203and the second through hole205divide the pixel electrode into a first sub-pixel electrode206, a second sub-pixel electrode207, a third sub-pixel electrode208, and a fourth sub-pixel electrode209. A hollow structure is located at a center of intersection of the horizontal main electrode202and the longitudinal main electrode204, and the first sub-pixel electrode206, the second sub-pixel electrode207, the third sub-pixel electrode208, and the fourth sub-pixel electrode209are connected with each other by the peripheral border201.

As shown inFIG. 3, which is a structural schematic diagram of a pixel unit provided by embodiment 2 of the present disclosure, the pixel unit includes: a peripheral border301surrounding a pixel electrode; a main electrode320connected with the peripheral border301and being cross-shaped, where the main electrode320includes a horizontal main electrode302and a longitudinal main electrode303perpendicular to each other, and the horizontal main electrode302and the longitudinal main electrode303divide the pixel electrode into four domains; and branch electrodes parallel to each other and disposed with intervals in one of the domains of the pixel electrode. Each of the branch electrodes is connected with the horizontal main electrode302or the longitudinal main electrode303at a third predetermined angle. The third predetermined angle is preferably at an angle between 10 degrees and 80 degrees. A first branch electrode304is parallel to a fourth branch electrode307, a second branch electrode305is parallel to a third branch electrode306, and a second predetermined angle is between the first branch electrode304and the third branch electrode306. The second predetermined angle is preferably at an angle between 60 degrees and 120 degrees.

Each of the horizontal main electrodes302includes first main sub-electrodes3021. Each of the longitudinal main electrodes303includes second main sub-electrodes3031. The first main sub-electrodes3021are formed by extending the horizontal main electrode302in a region of the first through hole (108, as shown inFIG. 1) in an extending direction along the branch electrodes until the horizontal main electrode302intersects. The second main sub-electrodes3031are formed by extending the longitudinal main electrode303in a region of the second through hole (109, as shown inFIG. 1) in an extending direction along the branch electrodes until the longitudinal main electrode303intersects.

First slits308and second slits309arranged in a mirroring symmetry on a basis of the longitudinal main electrode303are formed from the horizontal main electrode302, by using the first main sub-electrodes3021. Third slits310and fourth slits311arranged in a mirroring symmetry on a basis of the horizontal main electrode302are formed from the longitudinal main electrode303, by using the second main sub-electrodes3031. The first slits308, the second slits309, the third slits310, and the fourth slits311are all arranged with intervals. The first main sub-electrodes3021and the second main sub-electrodes3031overlap at an intersection of the horizontal main electrode302and the longitudinal main electrode303.

The first slits308, the second slits309, the third slits310, and the fourth slits311form a topography with grooves so as to cause liquid crystals to have a certain orientation. The irregular dark fringes will not be induced by an interaction of different tilting directions of the liquid crystals in regions of the first slits308, the second slits309, the third slits310, and the fourth slits311. Further, an electric field strength is decreased in a corresponding position of the horizontal main electrode302and the longitudinal main electrode303, and therefore the effect of the electric field on the liquid crystals is also decreased. The tilting conflict of liquid crystals of the main electrode320between different sub-pixels will also be decreased, thereby reducing the effect of the dark fringes.

The first main sub-electrodes3021and the second main sub-electrodes3031can also not extend in an extending direction along the branch electrodes, such as vertically extending intersection, or arc extending intersection, etc., so as to form corresponding slits, which can constitute a topography with grooves. The specific shapes of the first main sub-electrodes3021and the second main sub-electrode3031are not limited herein.

The present disclosure further provides a liquid crystal display panel including the pixel unit described above.

Compared with a pixel unit in conventional technologies, in the pixel unit of the present disclosure, a hollowing process is correspondingly performed on a cross-shaped main electrode of a pixel electrode, such that the main electrode forms a hollow and cross-ring structure. The corresponding hollowed region of the main electrode forms a topography with grooves so as to cause liquid crystals to have a certain orientation. The irregular dark fringes will not be induced by an interaction of different tilting directions of the liquid crystals in the corresponding hollowed region. Further, an electric field strength is decreased in the corresponding hollowed region of the cross-shaped main electrode of the pixel electrode, and the effect of the electric field on the liquid crystals is also decreased, such that the tilting conflict of liquid crystals between the different sub-pixel electrodes divided by the main electrode will also be decreased. Therefore, the effect of the dark fringes is greatly reduced.

As described above, although the present disclosure has been described in preferred embodiments, they are not intended to limit the disclosure. One of ordinary skill in the art, without departing from the spirit and scope of the disclosure within, can make various modifications and variations, so the range of the scope of the disclosure is defined by the claims.