TW201520647A - Display panel and display apparatus including the same - Google Patents

Abstract

This disclosure provides a display panel and a display apparatus including the same. The display panel includes: a first substrate and an opposing second substrate; a LC layer interposed between the first and second substrates; a first electrode layer disposed on the first substrate; an insulation layer disposed on the first electrode layer; a second electrode layer disposed on the insulation layer and having multiple first bar-shaped electrodes in a first direction and electrically connected to each other; a first alignment layer disposed on the second electrode layer and having its alignment in a second direction; a third electrode layer disposed on the second substrate; and a second alignment layer disposed on the third electrode layer and having its alignment in a third direction; wherein the angle between the second and third directions is between 65 and 90 degrees; and the angle between the first and second directions is between (0.1463[Delta]nd+27.39) and (0.2375[Delta]nd-73.75) degrees, where [Delta]nd denotes the product of birefringence [Delta]n and thickness d of the LC layer.

Description

Display panel and display device including the same

The present invention relates to a display panel and a display device including the same.

A panel of a liquid crystal display usually has two glass substrates stacked one on top of the other: a thin film-transistor (TFT) substrate and a color filter (CF) substrate. At present, the manufacturing technology of liquid crystal displays mainly develops toward high resolution, high contrast, and wide viewing angle, and is suitable for applications in the fields of entertainment, communication, or work.

However, for special occasions where the privacy requirements are strong, for example, the display operation of the cash machine, the personal use of a notebook computer or a smart mobile phone, a high-authenticity transmittance and a narrow viewing angle display with a visible side angle of less than 20 degrees. Can meet the user's anti-peeping needs. Therefore, it is necessary to develop a narrow-angle anti-peep display panel technology to treat and improve the above problems.

In order to achieve the object, an embodiment of the present invention provides a display panel including: a first substrate and a second substrate disposed to face the first substrate; a liquid crystal layer disposed on the first Between the substrate and the second substrate; a first electrode layer disposed on the first substrate; an insulating layer disposed on the first electrode layer; a second electrode layer including the first direction And a plurality of first strip electrodes electrically connected to each other and disposed on the insulating layer; a first alignment layer disposed on the second electrode layer and having the alignment direction of the first alignment layer be parallel a second electrode layer is disposed on the second substrate; and a second alignment layer is disposed on the third electrode layer, and the alignment direction of the second alignment layer is parallel to a third direction, wherein The angle between the third direction and the second direction is between 65 degrees and 90 degrees; wherein the angle between the first direction and the second direction is between Between (0.1463 Δnd + 27.39) degrees and (0.2375 Δnd - 73.75) degrees, where Δnd is the product of the birefringence difference Δn of the liquid crystal layer and the thickness d of the liquid crystal layer.

According to another aspect of the present invention, a display device includes a display panel and a backlight module, the display panel including: a first substrate and a second substrate disposed to face the first substrate a liquid crystal layer disposed between the first substrate and the second substrate; a first electrode layer disposed on the first substrate; an insulating layer disposed on the first electrode layer; a second electrode The layer includes a plurality of first strip electrodes arranged along a first direction and electrically connected to each other, and disposed on the insulating layer; a first alignment layer disposed on the second electrode layer, and the The alignment direction of the first alignment layer is parallel to a second direction; a third electrode layer is disposed on the second substrate; and a second alignment layer is disposed on the third electrode layer, and the second alignment layer is disposed The alignment direction is parallel to a third direction, wherein the angle between the third direction and the second direction is between 65 degrees and 90 degrees; wherein the angle between the first direction and the second direction is between (0.1463Δnd+ 27.39) between degrees and (0.2375 Δnd - 73.75) degrees, Δnd is the product of the birefringence difference Δn of the liquid crystal layer and the thickness d of the liquid crystal layer.

In an embodiment, the liquid crystal molecules may be negative liquid crystals.

The second electrode layer may further include a plurality of second strip electrodes arranged along a fourth direction, and the angle between the first direction and the horizontal reference direction of the display panel may be between 20 degrees and 40 degrees. And the angle between the fourth direction and the horizontal reference direction of the display panel may be between 20 degrees and 40 degrees.

In an embodiment, the first sub-electrodes may be disposed in a first region, the second sub-electrodes may be disposed in a second region, and the first region and the second region do not overlap each other.

In an embodiment, the first sub-electrodes may be disposed in a first region and a second region, and the second sub-electrodes may be disposed in a third region and a fourth region, and the first The zone, the second zone, the third zone, and the fourth zone do not overlap each other.

In an embodiment, the angle between the first direction and the horizontal reference direction of the display panel is between 25 degrees and 35 degrees, and the angle between the fourth direction and the horizontal reference direction of the display panel is between 25 degrees and Between 35 degrees.

10‧‧‧ display device

11‧‧‧ Display screen

20/100‧‧‧ display panel

110‧‧‧First substrate

112‧‧‧First electrode layer

114‧‧‧Insulation

116‧‧‧Second electrode layer

118‧‧‧First alignment layer

120‧‧‧second substrate

122‧‧‧ third electrode layer

128‧‧‧Second alignment layer

130‧‧‧Liquid layer

131‧‧‧liquid crystal molecules

161‧‧‧First sub-domain

162‧‧‧Second sub-domain

163‧‧‧ third sub-domain

164‧‧‧ fourth sub-domain

165‧‧‧Main frame electrode

166‧‧‧First branch electrode

167‧‧‧Second branch electrode

FIG. 1 is a schematic cross-sectional view of a display panel according to an embodiment of the present invention.

Figure 2A is a front view of a display screen illustrating the azimuth angle 任一 in any particular direction on the screen.

FIG. 2B is a schematic view showing the arrangement of liquid crystal molecules in the display panel, which can be represented by the azimuth angle 天 and the zenith angle θ.

FIG. 3 is a diagram showing the maximum transmittance distribution which may be obtained after the driving voltage is applied to the display panel of the embodiment.

4A is a schematic plan view of a second electrode layer in an embodiment of a pixel region.

4B is a plan view showing the second electrode layer of another embodiment in a pixel region.

Fig. 4C is a graph showing the transmittance of the pixel electrodes of Figs. 4A and 4B, respectively, with a voltage of 0 to 10 V.

4D and 4E are optical texture diagrams of pixel regions of a display panel having open and closed bipartite pixel electrodes, respectively.

FIG. 4F is an optical contrast view of the display panel of the embodiment.

4G and 4H are respectively left and right viewing angles and upper and lower viewing angle distributions of the transmittance of the display panel at different pixel voltages in the embodiment.

Fig. 5A is a plan view showing the second electrode layer of another embodiment in a pixel region.

Fig. 5B is a plan view showing the second electrode layer of another embodiment in a pixel region.

Fig. 5C is a graph showing the transmittance of the pixel electrodes of Figs. 5A and 5B applied with a voltage of 0 to 10 V, respectively.

5D and 5E are optical texture diagrams of pixel regions of a display panel having open and closed quarter-divide pixel electrodes, respectively.

FIG. 5F is an optical contrast view of the display panel of the embodiment.

FIG. 5G and FIG. 5H are respectively left and right viewing angles and upper and lower viewing angle distributions of the transmittance of the display panel under different pixel voltages according to the embodiment.

FIG. 6 is a schematic structural view of a display device according to an embodiment of the present invention, which includes a display panel according to the foregoing embodiment.

In order to further understand and understand the features, objects and functions of the present invention, the embodiments of the present invention are described in detail with reference to the drawings. In all of the specification and the drawings, the same component numbers will be used to designate the same or similar components.

In the description of the various embodiments, when an element is described as "above/on" or "below/under" another element, it is meant to be directly or indirectly above or below the other element. , which may contain other elements set in between; the so-called "directly" means that no other intermediary elements are set in between. The descriptions of "Upper/Upper" or "Bottom/Lower" are based on the schema, but also include other possible direction changes. The so-called "first", "second", and "third" are used to describe different elements that are not limited by such predicates. For the convenience and clarity of the description, the thickness or size of each element in the drawings is expressed in an exaggerated or omitted or schematic manner, and the size of each element is not completely the actual size.

1 is a schematic cross-sectional view of a display panel 100 according to an embodiment of the present invention. The first substrate 110, a second substrate 120, and a liquid crystal layer 130 are included in the first substrate 110 and the second substrate 120. The liquid crystal layer 130 is disposed or filled between the first substrate 110 and the second substrate 120. In addition, a first electrode layer 112, an insulating layer 114, a second electrode layer 116 and a first alignment layer 118 are disposed on the upper surface of the first substrate 110, and the upper surface of the second substrate 120 is A third electrode layer 122 and a second alignment layer 128 are disposed. The first electrode layer 112 is an electrode layer of a planar film for use as a common electrode of the first reference potential of the display panel 100; the second electrode layer 116 includes a plurality of strip electrodes 116 that are substantially coplanar ( The in-plane parallel electrodes are electrically connected to each other and have the same potential as the pixel electrode of the pixel region of the display panel 100; the third electrode layer 128 is also an electrode layer of a planar film, A common electrode of the second reference potential of the display panel 100.

As shown in FIG. 1 , the first substrate 110 and the second substrate 120 are stacked face to face, and a plurality of spacers (not shown) are disposed between the substrates 110 and 120 for making A gap between the first substrate 110 and the second substrate 120 can be maintained at a fixed pitch, and the liquid crystal layer 130 can be filled therein. The first substrate 110 is configured to carry the first electrode layer 112, the insulating layer 114, the second electrode layer 116, and the first alignment layer 118. The second substrate 120 is configured to carry the third electrode layer 122 and the The second alignment layer 128. The first substrate 110 or the second substrate 120 may be a flexible or rigid transparent substrate. In this embodiment, the first substrate 110 and the second substrate 120 are both glass substrates, and the first substrate 110 is There is a thin film transistor (TFT, not shown) as a pixel switch control, and a color filter (CF, not shown) is disposed on the second substrate 120. In the process technology of the display panel, the first The substrate 110 may be referred to as a thin film transistor substrate, and the second substrate 120 may be referred to as a color filter substrate.

As shown in FIG. 1 , the first electrode layer 112 , the insulating layer 114 , the second electrode layer 116 , and the first alignment layer 118 are sequentially disposed on the first substrate 110 . The first electrode layer 112 is disposed on the first substrate 110 as a planar electrode layer covering the entire pixel region for providing a first reference potential of the pixel. The first electrode layer 112 may be composed of a transparent conductive material, for example, Indium Tin Oxide (ITO). The insulating layer 114 is disposed on the first electrode layer 112 for protecting the first electrode layer 112, thereby isolating the first electrode layer 112 and the second electrode layer 116 to be fabricated later.

In order to more clearly describe the arrangement direction of the liquid crystal molecules, FIGS. 2A and 2B are provided below to facilitate the reader to understand the coordinate system and angle relationship of the liquid crystal display screen 11 including the display panel 100 described above. Assuming that we face the display screen 11 and use the horizontal reference line of the display screen 11 in the right direction (ie, the X direction) as the reference reference for the angle description, any particular direction on the display screen 11 can be expressed as the azimuth angle. (azimuthalal angle) ψ, as shown in FIG. 2A, that is, a front view of the display screen 11, and the direction in which the display screen 11 is vertically upward is the Y direction. In addition, assuming that the direction of the first substrate 110 (the substrate under the display panel 100 or the thin film transistor substrate) toward the liquid crystal layer 130 is the Z direction, the liquid crystal layer The arrangement of the liquid crystal molecules 131 in 130 may be represented by an azimuthal angle ψ and a vertices θ as shown in FIG. 2B.

The second electrode layer 116 is disposed on the insulating layer 114 as a pixel electrode of the pixel region of the display panel 100. The second electrode layer 116 includes a plurality of coplanar parallel strip electrodes 116 electrically connected to each other. The connections have the same potential. The strip electrodes 116 are arranged in parallel in the same direction (this corresponds to the "first direction" described in the patent application scope), and the azimuth angle is ψ ₁ . By the potential difference and the positional arrangement between the first electrode layer 112 and the second electrode layer 116, an appropriate electric field distribution can be formed, whereby the liquid crystal molecules are aligned in an appropriate direction. The second electrode layer 116 may be composed of a transparent conductive material such as indium tin oxide (ITO). The first alignment layer 118 is disposed on the second electrode layer 116 for arranging the long axis (or molecular axis or polarization axis) of the liquid crystal molecules adjacent to the first alignment layer 118 in an appropriate direction. The first alignment layer 118 may be composed of a transparent polymer material, for example, polyimide (PI). In this embodiment, the first alignment layer 118 is subjected to a rubbing process in a specific direction to obtain a direction of alignment (this may correspond to the "second direction" described in the patent application scope), so as to be adjacent to the first The long axis of the liquid crystal molecules of an alignment layer 118 may be arranged along the alignment direction parallel to the surface plane of the first alignment layer 118, the azimuth angle is ψ ₂ and the zenith angle θ is close to 90 degrees, which may be called parallel Or homogenous (Homogeneous) liquid crystal alignment.

a first alignment layer disposed on the second electrode layer and having the direction of the first alignment layer parallel to a second direction; a third electrode layer disposed on the second substrate; and a second alignment layer Formed on the third electrode layer, and the alignment direction of the second alignment layer is parallel to a third direction. Further, the third electrode layer 122 and the first surface are disposed on the upper surface of the second substrate 120. Two alignment layers 128. The third electrode layer 122 is disposed on the second substrate 120 as a planar electrode layer covering the entire pixel region for providing a second reference potential of the pixel. The third electrode layer 122 may be composed of a transparent conductive material such as indium tin oxide (ITO). By the potential difference and the positional arrangement between the third electrode layer 122 and the second electrode layer 116, an appropriate electric field distribution can be formed, whereby the liquid crystal molecules are aligned in an appropriate direction. The second alignment layer 128 is disposed on the third electrode layer 122 for arranging the long axes of the liquid crystal molecules adjacent to the second alignment layer 128 in an appropriate direction. The second alignment layer 128 can be composed of a transparent polymeric material, such as polyacetamide (PI). In this embodiment, the second alignment layer 128 is subjected to a rubbing treatment in a specific direction to obtain an alignment direction thereof (this may correspond to the "third direction" described in the patent application scope) so that the first alignment layer is adjacent to the first alignment layer. The long axis of the liquid crystal molecules of 118 may be aligned perpendicular to the surface plane of the second alignment layer 128, which may be referred to as a vertical liquid crystal alignment; and the alignment processing of the second alignment layer 128 is substantially the same as the first The first alignment layer 118 on the substrate 110 has the same rubbing direction. Therefore, the liquid crystal molecules adjacent to the second alignment layer 128 have an azimuth angle of ψ ₂ and a zenith angle θ close to 0 degrees.

The liquid crystal layer 130 includes a plurality of uniaxially anisotropic liquid crystal molecules having a long axis. In this embodiment, we will adopt a Hybrid liquid crystal alignment mode, that is, the long axis of the liquid crystal molecules adjacent to the first alignment layer 118 is parallel to the surface plane of the first alignment layer 118, and adjacent The long axis of the liquid crystal molecules of the second alignment layer 128 is perpendicular to the surface plane of the second alignment layer 128. In addition, the first alignment layer 118 and the second alignment layer 128 are aligned in the same rubbing direction. Therefore, the liquid crystal molecules adjacent to the first alignment layer 118 have a specific azimuth angle ψ ₂ and the zenith angle θ is close to At 90 degrees, the azimuth angle of the liquid crystal molecules adjacent to the second alignment layer 128 is also ψ ₂ and its zenith angle θ is close to 0 degrees. However, as a result of the actual liquid crystal alignment process, the liquid crystal molecules adjacent to the first alignment layer 118 or the second alignment layer 128 may not be completely parallel or perpendicular to the surface plane of the alignment layer, and a pre-tilt may be formed. Between the liquid crystal molecules and the alignment layer. Therefore, in the present embodiment, the long axis of the liquid crystal molecules adjacent to the first alignment layer 118 and the long axis of the liquid crystal molecules adjacent to the second alignment layer 128 have an angle of the zenith angle between 65 degrees and 90 degrees. . The uniaxially anisotropic liquid crystal can be further divided into positive and negative liquid crystals; when the liquid crystal is affected by an electric field, the long axis of the positive liquid crystal molecules tends to be aligned parallel to the direction of the electric field, and The long axis of the negative liquid crystal molecules tends to be aligned perpendicular to the direction of the electric field. In this embodiment, the composition of the liquid crystal layer 130 is a negative liquid crystal.

The first alignment layer 118 is subjected to friction in a specific direction during the liquid crystal alignment process so that the long axes of the liquid crystal molecules adjacent to the first alignment layer 118 can be substantially aligned along the rubbing direction. In order to find the preferred alignment direction of the liquid crystal molecules adjacent to the first alignment layer 118, we first take the azimuthal difference Δψ (Δψ=ψ ₁ -ψ ₂ , where ψ _{1 is} the second electrode layer 116 The arrangement azimuth of the strip electrodes 116, ψ _{2 is} the alignment azimuth of the alignment layer 118 or 128, the birefringence difference Δn of the material properties of the liquid crystal layer, and the thickness d of the liquid crystal layer 130 are taken as The main S variable factor, for different Δnd product values (Δnd=Δn×d) as the horizontal axis of the coordinate system and different azimuth difference Δψ as the vertical axis of the coordinate system, the display panel 100 is applied after the driving voltage is applied. The maximum penetration performance that may be obtained, and the numerical distribution of the normalized transmittance is obtained, as shown in Fig. 3. For example, for a liquid crystal material having a normal refractive index n _o of 1.4850 and an abnormal refractive index n _e of 1.5901, the birefringence difference Δn is 0.1051. In addition, the thickness d of the liquid crystal layer 130 is usually less than 4 μm, but the invention is not limited thereto.

Through the observation of Fig. 3, we can find that the indicator line A and the indicator line B are relatively high-normalized transmittance values, which mostly exceed 70%, and the rest of the penetration rate is not good. The straight line equation indicating line A can be expressed as Δψ=0.1463Δnd+27.39 degrees, and the indication line B can be expressed as Δψ=0.2375Δnd-73.75 degrees. Therefore, for the liquid crystal material selected for the display panel 100 and the thickness of the liquid crystal layer 130, the preferred azimuthal difference Δψ of the first alignment layer 118 can be estimated by the known Δnd value (0.1463Δnd). +27.39) degrees between (0.2375 Δnd - 73.75) degrees; for example, if the Δnd of the liquid crystal layer 130 is 340 nm, the preferred azimuth difference Δψ is between 45 degrees and 83 degrees; The arrangement azimuth angle ψ _{1 of the} strip electrodes 116 may have an angle difference between 45 degrees and 83 degrees from the azimuth angle ψ ₂ of the alignment friction of the alignment layer 118 or 128.

The second electrode layer 116 may be a multi-domain configuration in each pixel region. 4A is a schematic plan view of a second electrode layer 116 in a pixel region of an embodiment, the pixel region being divided into a first sub-domain 161 of the upper half and a second sub-domain 162 of the lower half, and the The two-electrode layer 116 includes a main frame electrode 165, a plurality of first branch electrodes 166, and a plurality of second branch electrodes 167. Where the main frame The electrode 165 has an E-shaped pattern, and the first branch electrodes 166 are a first group of strip electrodes arranged in parallel in the same direction (this may correspond to the "first direction" described in the patent application scope). The second branch electrodes 167 are a second group of strip electrodes arranged in parallel in the same direction (this may correspond to the "fourth direction" described in the patent application scope) and transmitted through the main frame electrode 165. The branch electrodes 166 and 167 are connected; that is, one ends of the respective branch electrodes 166 and 167 are connected to each other. Since the main frame electrode 165 does not completely close the branch electrodes 166 and 167, the second electrode layer 116 may be referred to as an open bipartite pixel electrode. In addition, FIG. 4B is a schematic plan view of the second electrode layer 116 in another pixel region of another embodiment, the second electrode layer 116 forming a closed square and the branch electrodes 166 and 167 except the main frame electrode 165. The rest is identical to the embodiment of FIG. 4A and will not be described again, and the second electrode layer 116 may be referred to as a closed bipartite pixel electrode. Regarding the embodiment of the bifurcated pixel electrode, the rubbing alignment process of the first alignment layer 118 may be that the first sub-domain 161 of the upper half and the second sub-domain 162 of the lower half have the same rubbing direction, for example , both in the +Y direction; or, the first sub-domain 161 of the upper half and the second sub-domain 162 of the lower half adopt opposite rubbing directions, for example, the first sub-domain 161 adopts the +Y direction Friction, and the second sub-domain 162 employs friction in the -Y direction; the invention is not limited thereto.

For the pixel electrodes of FIGS. 4A and 4B, the arrangement or extension azimuth angle 该 of the branch electrodes 166 and 167 (the angle between the arrangement direction of the branch electrodes and the X direction of the display screen) is In the embodiment, the arrangement azimuth angles of the branch electrodes may be between 20 degrees and 40 degrees, for example, 30 degrees, 35 degrees, and 40 degrees, respectively, and a voltage of 0 to 10 V is applied, and the transmittance is measured. The normalized value is calculated; if the thickness d of the liquid crystal layer 130 is 3.6 μm, the result is as shown in Fig. 4C. Preferably, the arrangement azimuth angles of the branch electrodes may be between 25 degrees and 35 degrees. We can see from FIG. 4C that the display panel 100 of the open bipartite pixel electrode has better transmittance performance than the closed bipartite pixel electrode; and whether it is an open or closed dichotomy The pixel electrode has a better penetration when the azimuth angle ψ is 30 degrees. Rate performance. In addition, FIG. 4D is an optical texture diagram of a pixel region of the display panel 100 having an open bipartite pixel electrode according to the embodiment, and FIG. 4E is a pixel region of the display panel 100 having the closed bipartite pixel electrode of the embodiment. The optical texture map also shows that the display panel 100 of the open bipartite pixel electrode has a better transmittance distribution performance. In addition, when the azimuth angle 上述 is 30 degrees, the 4F is an optical contrast (Contrast) view of the display panel 100 of the embodiment. For convenience of explanation, the comparison 10 is used as the maximum contrast for the anti-peep, higher than 10 is considered to have no anti-peep effect, and the comparison of the figure exceeds 10 to 10, which shows that the display panel 100 can provide a narrow viewing angle screen of less than about 20 degrees, and has a narrow viewing angle anti-spy function when looking at the screen. 4G and 4H are respectively left and right viewing angles and upper and lower viewing angle distributions of the transmittance of the display panel 100 at different pixel voltages (0~10V), which show the positive viewing angle of the display panel 100. The rate is not in the best state, the performance of the upper and lower viewing angles is asymmetrical, and the transmittance of the left and right viewing directions in the light/dark state is high, which is advantageous for its application on a narrow viewing angle display. In this embodiment, the thickness d of the liquid crystal layer 130 may also be other values less than 4 μm, for example, 3.9 μm.

FIG. 5A is a schematic plan view of the second electrode layer 116 in another pixel region in another embodiment, the pixel region being divided into a first sub-domain 161 of the upper left portion, a second sub-domain 162 of the upper right portion, and a second lower portion of the second electrode layer. The third sub-field 163 and the fourth lower sub-area 164, and the second electrode layer 116 includes a main frame electrode 165, a plurality of first branch electrodes 166, and a plurality of second branch electrodes 167. The main frame electrode 165 is a "Wang"-shaped pattern, and the first branch electrodes 166 are the first group of strip electrodes, which are in the same direction (this can correspond to the first paragraph described in the patent application scope). The second branch electrodes 167 are arranged in parallel, and the second branch electrodes 167 are arranged in parallel in the same direction (this may correspond to the "fourth direction" described in the patent application scope) and are transmitted through The main frame electrodes 165 are connected to the branch electrodes 166 and 167; that is, one ends of the respective branch electrodes 166 and 167 are connected to each other. Since the main frame electrode 165 does not completely enclose the branch electrodes 166 and 167, the second electrode layer 116 may be referred to as an open quadrant pixel electrode. In addition, FIG. 5B is a second electrode layer 116 of another embodiment in a pixel region. In the schematic diagram of the inside, the second electrode layer 116 is identical to the embodiment of FIG. 5A except that the main frame electrode 165 forms a closed square and the branch electrodes 166 and 167 are completely closed, and will not be described again. And the second electrode layer 116 can be referred to as a closed quarter-domain pixel electrode. Regarding the embodiment of the quadrant pixel electrode, the friction alignment processing of the first alignment layer 118 may be the first sub-domain 161 of the upper half and the third sub-domain of the second sub-region 162 and the lower half. 163 and the fourth sub-domain 164 adopt the same rubbing direction, for example, both in the +Y direction; or the first sub-domain 161 of the upper half and the third sub-domain 162 and the third half of the lower half The sub-field 163 and the fourth sub-field 164 adopt opposite rubbing directions. For example, the first sub-field 161 and the second sub-domain 162 adopt friction in the +Y direction, and the third sub-field 163 and the fourth sub-field The field 164 employs friction in the -Y direction; the invention is not limited thereto.

For the pixel electrodes of FIGS. 5A and 5B, the arrangement or extension azimuth angle 该 of the branch electrodes 166 and 167 (the angle between the branch electrode arrangement directions and the X direction of the display screen) is In the embodiment, the arrangement azimuth angles of the branch electrodes may be between 20 degrees and 40 degrees, for example, 30 degrees, 35 degrees, and 40 degrees, respectively, and a voltage of 0 to 10 V is applied, and the transmittance is measured. The normalized value is calculated; if the thickness d of the liquid crystal layer 130 is 3.6 μm, the result is shown in Fig. 5C. Preferably, the arrangement azimuth angles of the branch electrodes may be between 25 degrees and 35 degrees. We can see from Figure 5C that the display panel 100 of the open quadrant pixel electrode has better transmittance performance than the closed quarter-domain pixel electrode; and whether it is open or closed The quad-domain pixel electrode has a better transmittance performance when the azimuth angle 上述 is 30 degrees. In addition, FIG. 5D is an optical texture diagram of a pixel region of the display panel 100 having an open quadrant pixel electrode according to the embodiment, and FIG. 5E is a pixel of the display panel 100 having the closed quadrant pixel electrode of the embodiment. The optical texture map of the region also shows that the display panel 100 of the open quadrant pixel electrode has a better transmittance distribution performance. In addition, when the azimuth angle 上述 is 30 degrees, the 5F is an optical contrast (Contrast) view of the display panel 100 of the embodiment. For convenience of explanation, the comparison 10 is used as the maximum contrast for the anti-peep, higher than 10 is considered to have no anti-peep effect. The comparison of this figure exceeds 10 and is calibrated to 10, which shows that the display panel 100 is indeed It can provide a narrow viewing angle screen of less than about 20 degrees, and has a narrow viewing angle anti-spy function when looking at the screen; 5G and 5H are respectively different pixel voltages (0~10V) of the display panel 100 of the embodiment. The left and right viewing angles of the lower transmittance and the upper and lower viewing angle distribution maps show that the forward viewing angle of the display panel 100 can reach an optimal state, and the transmittance of the left and right viewing directions in the light/dark state is high, so Conducive to its application on narrow viewing angle displays.

Finally, FIG. 6 is a schematic structural diagram of a display device 10 according to an embodiment of the present invention. The display device 10 includes a backlight module (not shown) and a display panel 20 according to the foregoing embodiment. The display device 10 may be a computer device including a display panel as a screen, a mobile phone, a tablet computer, or a digital photo frame, etc., but the invention is not limited thereto. The display panel 20 may be a liquid crystal panel, and the arrangement of the liquid crystal molecules may be affected by an external voltage or an electric field to cause a change in the polarization of the light to achieve display of the image.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto. It is to be understood that the scope of the present invention is not limited by the spirit and scope of the present invention, and should be considered as a further embodiment of the present invention.

100‧‧‧ display panel

110‧‧‧First substrate

112‧‧‧First electrode layer

114‧‧‧Insulation

116‧‧‧Second electrode layer

118‧‧‧First alignment layer

120‧‧‧second substrate

122‧‧‧ third electrode layer

128‧‧‧Second alignment layer

130‧‧‧Liquid layer

Claims (10)

A display panel includes: a first substrate and a second substrate disposed opposite to the first substrate; a liquid crystal layer disposed between the first substrate and the second substrate; a first electrode layer disposed On the first substrate; an insulating layer disposed on the first electrode layer; a second electrode layer comprising a plurality of first strip electrodes arranged along a first direction and electrically connected to each other, and disposed On the insulating layer, a first alignment layer is disposed on the second electrode layer, and the alignment direction of the first alignment layer is parallel to a second direction; a third electrode layer is disposed on the second substrate And a second alignment layer disposed on the third electrode layer, and the alignment direction of the second alignment layer is parallel to a third direction, wherein the angle between the third direction and the second direction is between 65 degrees and Between 90 degrees; wherein the angle between the first direction and the second direction is between (0.1463Δnd+27.39) degrees and (0.2375Δnd-73.75) degrees, wherein Δnd is the double refractive index difference of the liquid crystal layer The product of the value Δn and the thickness d of the liquid crystal layer. The display panel of claim 1, wherein the first direction and the second direction are between 45 degrees and 83 degrees. The display panel of claim 1, wherein the liquid crystal molecules are negative liquid crystals. The display panel of claim 1, wherein the liquid crystal layer has a thickness of between 0 and 4 μm. The display panel of claim 1, wherein the second electrode layer further comprises a plurality of second strip electrodes arranged along a fourth direction, the first direction and a horizontal reference of the display panel The angle of the direction is between 20 degrees and 40 degrees, and the angle between the fourth direction and the horizontal reference direction of the display panel is between 20 degrees and 40 degrees. The display panel of claim 5, wherein the first strip is One end of the electrode and the second strip electrodes are connected to each other. The display panel of claim 5, wherein the first strip electrodes are disposed in a first region, the second strip electrodes are disposed in a second region, and the first region The second zones do not overlap each other. The display panel of claim 5, wherein the first strip electrodes are disposed in a first region and a second region, and the second strip electrodes are disposed in a third region and a The fourth zone, and the first zone, the second zone, the third zone, and the fourth zone do not overlap each other. The display panel of claim 5, wherein an angle between the first direction and a horizontal reference direction of the display panel is between 25 degrees and 35 degrees, and the fourth direction is horizontal to the display panel. The angle of the reference direction is between 25 and 35 degrees. A display device includes a display panel and a backlight module, the display panel includes: a first substrate and a second substrate disposed opposite to the first substrate; a liquid crystal layer disposed on the first substrate and the Between the second substrate; a first electrode layer disposed on the first substrate; an insulating layer disposed on the first electrode layer; and a second electrode layer including the first electrode and being electrically connected to each other And a plurality of first strip electrodes are disposed on the insulating layer; a first alignment layer is disposed on the second electrode layer, and the alignment direction of the first alignment layer is parallel to a second direction; a third electrode layer is disposed on the second substrate; and a second alignment layer is formed on the third electrode layer, and the alignment direction of the second alignment layer is parallel to a third direction, wherein the third The angle between the direction and the second direction is between 65 degrees and 90 degrees; wherein the angle between the first direction and the second direction is between (0.1463 Δnd + 27.39) degrees and (0.2375 Δnd - 73.75) degrees Where Δnd is the birefringence difference Δn of the liquid crystal layer The product of the thickness d of the liquid crystal layer.