Display device

Abstract

The present invention discloses a display device, which includes a substrate, a plurality of sub-pixel structures, a plurality of scanning lines, a display medium layer and an alignment layer. Each sub-pixel structure includes a first sub-pixel region and a second sub-pixel region. The first sub-pixel region includes a first switching element and a first electrode, the first electrode has at least one first slit, and the first slit extends along the direction of the first slit. The second sub-pixel region includes a second switching element and a second electrode, the second electrode has at least one second slit, and the second slit extends along the direction of the second slit. The plurality of scanning lines include a first scanning line and a second scanning line, the first scanning line is electrically connected to the first switching element, and the second scanning line is electrically connected to the second switching element. The alignment layer has the same alignment direction in the regions corresponding to the plurality of sub-pixel structures, the first slit direction has a first angle with the alignment direction, the second slit direction has a second angle with the alignment direction, and the first angle is smaller than the second angle.

Description

Technical Field

[0001] The present invention relates to a display device, and in particular to a display device with an anti-peeping mode. Background Art

[0002] Today, display devices have been widely used in various electronic products, such as laptops, smart phones, wearable devices, smart watches, and car displays, providing users with more convenient information transmission and display. In traditional anti-peeping technologies for display devices, generally, an anti-peeping film is attached to the display device, or a viewing angle control panel is set in the display device. However, these traditional anti-peeping technologies will increase the overall thickness and weight of the display device, and even cause the display brightness of the display device to be significantly reduced. Summary of the invention

[0003] The present invention provides a display device, each sub-pixel structure of which comprises a first sub-pixel region and a second sub-pixel region which are controlled separately and have different slit extension directions, so as to achieve display and anti-peeping effects.

[0004] In order to solve the above technical problems, the present invention provides a display device, which includes a substrate, an opposing substrate, a plurality of sub-pixel structures, a plurality of scanning lines, a display medium layer and an alignment layer. The opposing substrate is arranged opposite to the substrate. A plurality of sub-pixel structures are arranged on the substrate, wherein each sub-pixel structure includes a first sub-pixel region and a second sub-pixel region. The first sub-pixel region includes a first switching element and a first electrode, the first electrode has at least one first slit, and the first slit extends along the direction of the first slit. The second sub-pixel region includes a second switching element and a second electrode, the second electrode has at least one second slit, and the second slit extends along the direction of the second slit. A plurality of scanning lines are arranged on the substrate, wherein the plurality of scanning lines include a first scanning line and a second scanning line, the first scanning line is electrically connected to the first switching element, and the second scanning line is electrically connected to the second switching element. The display medium layer is arranged on the plurality of sub-pixel structures, and the display medium layer is sandwiched between the substrate and the opposing substrate. The alignment layer is arranged between the plurality of sub-pixel structures and the display medium layer, wherein the alignment layer has the same alignment direction in the regions corresponding to the plurality of sub-pixel structures. There is a first angle between the first slit direction and the alignment direction, there is a second angle between the second slit direction and the alignment direction, and the first angle is smaller than the second angle.

[0005] In the present invention, since the first angle between the first slit direction and the alignment direction of the first electrode in the first sub-pixel area is designed to be different from the second angle between the second slit direction and the alignment direction of the second electrode in the second sub-pixel area, and the first switching element in the first sub-pixel area is connected to the second switching element in the second sub-pixel area by different scanning lines, the anti-peeping function can be performed by displaying or not in the sub-pixel area, without the need to additionally set up an external anti-peeping film or viewing angle control panel that would have an adverse effect on the thickness, weight and display brightness. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 FIG. 1 is a schematic top view of a display device according to a first embodiment of the present invention.

[0007] Figure 2 For along Figure 1 Schematic diagram of the cross section along the A-A' section line.

[0008] Figures 3 to 9 This is a simulation diagram of the brightness at different viewing angles for various slit directions of the electrode.

[0009] Figures 10 to 16 This is a simulation diagram of the contrast ratio at different viewing angles for various slit directions of the electrode.

[0010] Fig.17 It is a schematic diagram of the signal of the scan line and the display conditions of the first sub-pixel area and the second sub-pixel area in the first display mode according to the first embodiment of the present invention.

[0011] Fig.18 It is a schematic diagram of the signal of the scan line and the display conditions of the first sub-pixel area and the second sub-pixel area in the second display mode according to the first embodiment of the present invention.

[0012] Fig.19 FIG. 4 is a schematic diagram of the signal of the scan line and the display conditions of the first sub-pixel area and the second sub-pixel area in the anti-peeping mode according to the first embodiment of the present invention.

[0013] Fig. 20 FIG. 4 is a schematic top view of a transparent conductive layer according to a second embodiment of the present invention.

[0014] Description of reference numerals: 100, 200-display device; 110-substrate; 120-subpixel structure; 120a-first subpixel region; 120b-second subpixel region; 122-first electrode; 122S-first slit; 124-second electrode; 124S-second slit; 126-third electrode; 128-fourth electrode; 130, 132-alignment layer; 140-display medium layer; 150-opposite substrate; CL1-first conductive layer; CL2-second conductive layer; CL3-third conductive layer; CL4-fourth conductive layer; D1 -first direction; D2-second direction; DA-data line; Dm-alignment direction; Ds1-first slit direction; Ds2-second slit direction; IL1-first insulating layer; IL2-second insulating layer; IL3-third insulating layer; S1-first timing; S2-second timing; S3-third timing; S4-fourth timing; SC-scan line; SC1, SC1'-first scan line; SC2, SC2'-second scan line; T1-first switching element; T2-second switching element; θ-angle; θ1-first angle; θ2-second angle. DETAILED DESCRIPTION

[0015] In order to enable those skilled in the art to further understand the present invention, the preferred embodiments of the present invention are listed below, and the components and intended effects of the present invention are described in detail with the accompanying drawings. It should be noted that the drawings are simplified schematic diagrams, and therefore, only the components and combination relationships related to the present invention are shown to provide a clearer description of the basic architecture or implementation method of the present invention, while the actual components and layout may be more complex. In addition, for the convenience of explanation, the components shown in the various drawings of the present invention are not drawn in proportion to the actual number, shape, and size, and the detailed proportions can be adjusted according to the design requirements.

[0016] In the following specification and claims, when "A1 component is formed by B1", it means that the formation of A1 component exists with B1 or uses B1, and the formation of A1 component does not exclude the existence or use of one or more other features, regions, steps, operations and / or components. The ordinal numbers used in the specification and claims, such as "first", "second", etc., are used to modify the elements. They themselves do not imply and represent any previous ordinal numbers of the (or multiple) elements, nor do they represent the order of one element and another element or the order of the manufacturing method. The use of multiple ordinals is only used to make the element with a certain name clearly distinguishable from another element with the same name. The same words may not be used in the claims and the specification. Accordingly, the first component in the specification may be the second component in the claims. It should be noted that the following embodiments can replace, reorganize, and mix the features in several different embodiments to complete other embodiments without departing from the spirit of the present invention. The features between the embodiments can be mixed and matched as needed as long as they do not violate the spirit of the invention or conflict.

[0017] The display device of the present invention may be a non-self-luminous display device, such as a liquid crystal display (LCD), an electrophoretic display, or other suitable display devices, and the display device of the present invention may also be a display device with a touch function (touch display device), and the following embodiments are described by taking a liquid crystal display device as an example. It should be noted that the liquid crystal display device of the present invention may be an in-plane switching (IPS) liquid crystal display device and a fringe fields switching (FFS) liquid crystal display device, but is not limited thereto.

[0018] Please refer to Figure 1 and Figure 2 , Figure 1 is a schematic top view of a display device according to a first embodiment of the present invention, Figure 2 For along Figure 1 It should be noted that in this embodiment, the display device 100 is described by taking a fringe field switching (FFS) liquid crystal display device as an example, but the present invention is not limited thereto. Figure 1 and Figure 2As shown, the display device 100 of this embodiment includes a substrate 110, a plurality of sub-pixel structures 120, a plurality of scan lines SC, a plurality of data lines DA, a display medium layer 140, at least one alignment layer (e.g., alignment layers 130, 132) and an opposing substrate 150, wherein the substrate 110 and the opposing substrate 150 are arranged opposite to each other, and the sub-pixel structures 120, the scan lines SC, the data lines DA, the display medium layer 140 and the alignment layers 130, 132 are arranged on the substrate 110 and located between the substrate 110 and the opposing substrate 150.

[0019] The substrate 110 and the opposite substrate 150 may include any suitable material. In the present embodiment, the substrate 110 and the opposite substrate 150 may be a hard substrate or a flexible substrate, and may include, for example, glass, plastic, quartz, sapphire, polyimide (PI) and / or polyethyleneterephthalate (PET) according to their types, but are not limited thereto. Furthermore, the materials, shapes and sizes of the substrate 110 and the opposite substrate 150 may be the same or different from each other.

[0020] like Figure 1 and Figure 2 As shown, the sub-pixel structure 120 can be arranged between the display medium layer 140 and the substrate 110, and the sub-pixel structure 120 is a unit for displaying a picture. The display device 100 may include a plurality of pixels (Pixel), each pixel may include at least one sub-pixel structure 120, and the number and color of the sub-pixel structures 120 included in the pixel may be changed according to demand. For example, the plurality of sub-pixel structures 120 may include a green sub-pixel structure, a red sub-pixel structure and a blue sub-pixel structure, and each pixel may include a green sub-pixel structure, a red sub-pixel structure and a blue sub-pixel structure, so that the display device 100 may be a color display device, but is not limited thereto. For another example, the plurality of sub-pixel structures 120 may be used to generate light of the same color, and each pixel may include a sub-pixel structure 120, so that the display device 100 may be a monochrome display device, but is not limited thereto.

[0021] like Figure 2As shown, the sub-pixel structure 120 may be formed by at least one insulating layer, at least one conductive layer, at least one semiconductor layer, other suitable film layers or combinations thereof, wherein the material of the conductive layer may include metal, alloy, transparent conductive material (such as indium tin oxide (ITO), indium zinc oxide (IZO), etc.), other suitable conductive materials or combinations thereof, examples of the material of the insulating layer may include silicon oxide (SiOx), silicon nitride (SiNy), silicon oxynitride (SiOxNy), other suitable insulating materials or combinations thereof, examples of the material of the semiconductor layer may include polycrystalline silicon (poly-silicon), amorphous silicon (amorphous silicon), metal oxide (metal-oxide semiconductor) semiconductor (such as indium gallium zinc oxide (IGZO)), other suitable semiconductor materials or combinations thereof, but are not limited thereto. In this embodiment, the first conductive layer CL1, the first insulating layer IL1, the semiconductor layer (not shown), the second conductive layer CL2, the second insulating layer IL2, the third conductive layer CL3, the third insulating layer IL3 and the fourth conductive layer CL4 can be stacked in sequence and arranged on the substrate 110 to form a plurality of sub-pixel structures 120, but is not limited thereto.

[0022] In the present embodiment, each sub-pixel structure 120 may include a first sub-pixel region 120a and a second sub-pixel region 120b, wherein the first sub-pixel region 120a may be referred to as a display sub-pixel region in the present invention for normal display, and the second sub-pixel region 120b may be referred to as an anti-peeping sub-pixel region in the present invention for display in an anti-peeping mode. The first sub-pixel region 120a may include a first switch element T1, and the second sub-pixel region 120b may include a second switch element T2, wherein the first switch element T1 and the second switch element T2 may be, for example, top gate thin film transistors, bottom gate thin film transistors, dual gate thin film transistors, or other suitable types of transistors, but are not limited thereto. For example, the first switch element T1 and the second switch element T2 of the present embodiment may be bottom-gate thin film transistors, and the gate of the first switch element T1 and the gate of the second switch element T2 may be formed by the first conductive layer CL1, the source and the drain of the first switch element T1 and the source and the drain of the second switch element T2 may be formed by the second conductive layer CL2, and the channel layer of the first switch element T1 and the channel layer of the second switch element T2 may be formed by a semiconductor layer, but the present invention is not limited thereto. It should be noted that if the first switch element T1 and the second switch element T2 are other types of thin film transistors, the stacking order of the above-mentioned insulating layer, conductive layer and semiconductor layer may be adjusted according to requirements.

[0023] The first sub-pixel region 120a further includes a first electrode 122, and the second sub-pixel region 120b further includes a second electrode 124. It should be noted that the first electrode 122 is the electrode closest to the display medium layer 140 in the first sub-pixel region 120a, and the second electrode 124 is the electrode closest to the display medium layer 140 in the second sub-pixel region 120b. In the present embodiment, the first sub-pixel region 120a further includes a third electrode 126, and the second sub-pixel region 120b further includes a fourth electrode 128, the first electrode 122 is disposed between the third electrode 126 and the display medium layer 140, and the second electrode 124 is disposed between the fourth electrode 128 and the display medium layer 140, but the present invention is not limited thereto. Since the display device 100 of the present embodiment is a fringe field switching (FFS) liquid crystal display device, one of the first electrode 122 and the third electrode 126 of the first sub-pixel region 120a is a pixel electrode, the other of the first electrode 122 and the third electrode 126 of the first sub-pixel region 120a is a common electrode, one of the second electrode 124 and the fourth electrode 128 of the second sub-pixel region 120b is a pixel electrode, and the other of the second electrode 124 and the fourth electrode 128 of the second sub-pixel region 120b is a common electrode.

[0024] For example, in this embodiment (such as Figure 1 and Figure 2 As shown in the figure, the first electrode 122 and the second electrode 124 are pixel electrodes, the first electrode 122 and the second electrode 124 are formed by the same conductive layer (e.g., the fourth conductive layer CL4), the first electrode 122 and the second electrode 124 are separated from each other, the third electrode 126 and the fourth electrode 128 are common electrodes, the third electrode 126 and the fourth electrode 128 are formed by the same conductive layer (e.g., the third conductive layer CL3), and the third electrode 126 and the fourth electrode 128 have regions connected to each other, but the present invention is not limited thereto. In the present embodiment, since the first electrode 122 and the second electrode 124 are pixel electrodes, the third electrode 126 and the fourth electrode 128 are common electrodes, therefore, the first electrode 122 is electrically connected to the drain of the first switch element T1, the second electrode 124 is electrically connected to the drain of the second switch element T2, and the third electrode 126 and the fourth electrode 128 are electrically connected to a common voltage source, but the present invention is not limited thereto. In the present embodiment, the third conductive layer CL3 and the fourth conductive layer CL4 may be, for example, transparent conductive layers, but the present invention is not limited thereto.

[0025] For another example, in other embodiments (not shown), the first electrode 122 and the second electrode 124 are common electrodes and are formed by the same conductive layer (e.g., the fourth conductive layer CL4), the third electrode 126 and the fourth electrode 128 are pixel electrodes and are formed by the same conductive layer (e.g., the third conductive layer CL3), and the third electrode 126 and the fourth electrode 128 are separated from each other, but not limited thereto. In this case, the first electrode 122 and the second electrode 124 are electrically connected to a common voltage source, the third electrode 126 is electrically connected to the drain of the first switch element T1, and the fourth electrode 128 is electrically connected to the drain of the second switch element T2, but not limited thereto.

[0026] The scan line SC is electrically connected to the switch element (e.g., the gate of the switch element) of the sub-pixel structure 120 to provide a switch signal to the switch element. The data line DA is electrically connected to the switch element (e.g., the source of the switch element) of the sub-pixel structure 120 to provide a display grayscale signal to the switch element. When the switch element is turned on, the display grayscale signal is transmitted to the pixel electrode (e.g., the first electrode 122 and / or the second electrode 124 of the present embodiment). For example, in Figure 1 and Figure 2 In the embodiment, the scan line SC can be formed by the first conductive layer CL1 and extend along the first direction D1, and the data line DA can be formed by the second conductive layer CL2 and extend along the second direction D2, wherein the first direction D1 is not parallel to the second direction D2 (for example, the first direction D1 is perpendicular to the second direction D2), but is not limited to this.

[0027] exist Figure 1 and Figure 2 In the embodiment, the plurality of scan lines SC include a first scan line SC1 and a second scan line SC2. The first scan line SC1 is electrically connected to the gate of the first switch element T1, and the second scan line SC2 is electrically connected to the gate of the second switch element T2. That is, each sub-pixel structure 120 corresponds to two scan lines SC, but the present invention is not limited thereto. Figure 1 In the embodiment, one of the plurality of data lines DA is electrically connected to the source of the first switch element T1 and the source of the second switch element T2. That is, the first switch element T1 and the second switch element T2 in the same sub-pixel structure 120 are electrically connected to the same data line DA, but not limited thereto.

[0028] exist Figure 1, the first scan line SC1 and the second scan line SC2 are alternately arranged with each other, but the present invention is not limited thereto. It should be noted that, in the present embodiment, the first scan line SC1 is arranged between the first sub-pixel region 120a and the second sub-pixel region 120b, that is, the first sub-pixel region 120a and the second sub-pixel region 120b are respectively arranged on opposite sides of the first scan line SC1, so that the first scan line SC1 passes through the sub-pixel structure 120, and the sub-pixel structure 120 is located between two adjacent second scan lines SC2, but the present invention is not limited thereto. In other embodiments, the second scan line SC2 is arranged between the first sub-pixel region 120a and the second sub-pixel region 120b, so that the second scan line SC2 passes through the sub-pixel structure 120, and the sub-pixel structure 120 is located between two adjacent first scan lines SC1, but the present invention is not limited thereto. In other embodiments, the first scan line SC1 and the second scan line SC2 are respectively disposed on opposite sides of the sub-pixel structure 120 (the sub-pixel structure 120 is located between the first scan line SC1 and the second scan line SC2), so no scan line SC passes through the sub-pixel structure 120, and the first scan line SC1 and the second scan line SC2 may coexist between two adjacent sub-pixel structures 120, but the present invention is not limited thereto. Figure 1 In the embodiment, the data line DA is disposed between two adjacent sub-pixel structures 120 , but the present invention is not limited thereto.

[0029] In the present invention, the sizes of the first sub-pixel region 120a and the second sub-pixel region 120b can be designed according to the requirements. Figure 1 For example, the area of ​​the first sub-pixel region 120a may be larger than the area of ​​the second sub-pixel region 120b, but the present invention is not limited thereto. In other embodiments, the area of ​​the first sub-pixel region 120a may be equal to or smaller than the area of ​​the second sub-pixel region 120b. In the present invention, the top view shapes of the first sub-pixel region 120a and the second sub-pixel region 120b may be designed according to requirements. For example, in Figure 1 In the embodiment, the top-view shapes of the first sub-pixel region 120a and the second sub-pixel region 120b may be rectangular, but are not limited thereto.

[0030] In the present invention, the arrangement of the first sub-pixel region 120a and the second sub-pixel region 120b can be designed according to the requirements. Figure 1), the relative relationship between the first sub-pixel region 120a and the second sub-pixel region 120b in each sub-pixel structure 120 is the same, therefore, a plurality of first sub-pixel regions 120a may be arranged along the first direction D1, a plurality of second sub-pixel regions 120b may be arranged along the first direction D1, and a plurality of first sub-pixel regions 120a and a plurality of second sub-pixel regions 120b may be alternately arranged in the second direction D2, but the present invention is not limited thereto. In other embodiments, in the sub-pixel structures 120 arranged in the first direction D1 and / or the second direction D2, the relative relationship between the first sub-pixel region 120a and the second sub-pixel region 120b in each sub-pixel structure 120 may be different. For example, the relative relationship between the first sub-pixel region 120a and the second sub-pixel region 120b in two adjacent sub-pixel structures 120 in the first direction D1 may be different, so that a plurality of first sub-pixel regions 120a and a plurality of second sub-pixel regions 120b may be alternately arranged in the first direction D1, but the present invention is not limited thereto.

[0031] exist Figure 2 In the embodiment, the display medium layer 140 is disposed on the sub-pixel structure 120. Specifically, the display medium layer 140 is sandwiched between the substrate 110 and the counter substrate 150, and the display medium layer 140 may be a liquid crystal layer or other suitable medium layer. In the present embodiment, the display medium layer 140 may be a liquid crystal layer including a plurality of liquid crystal molecules, but is not limited thereto. It should be noted that the liquid crystal molecules may be positive liquid crystal molecules or negative liquid crystal molecules, and the liquid crystal molecules in the present embodiment take positive liquid crystal molecules as an example. In the present invention, a signal may be provided to the common electrode and the pixel electrode in the sub-pixel structure 120 to generate a corresponding electric field, so as to correspondingly change the light (backlight) transmittance of the display medium layer 140 (for example, by rotating the liquid crystal molecules through the electric field), thereby achieving the effect of displaying a picture.

[0032] In this embodiment, the display device 100 may have two alignment layers 130 and 132, wherein the alignment layer 130 is disposed between the sub-pixel structure 120 and the display medium layer 140, and the alignment layer 132 is disposed between the display medium layer 140 and the opposite substrate 150. The alignment layers 130 and 132 are used to align molecules (e.g., liquid crystal molecules) in the display medium layer 140, and the alignment directions Dm of the alignment layers 130 and 132 may be defined by any suitable alignment method, such as rubbing, crosslinking reaction, photo-alignment, or other suitable methods. In the present embodiment, the regions of the alignment layer 130 corresponding to the plurality of sub-pixel structures 120 all have the same alignment direction Dm, and the regions of the alignment layer 132 corresponding to the plurality of sub-pixel structures 120 all have the same alignment direction Dm. That is, the regions of the alignment layer 130 corresponding to the sub-pixel structures 120 all have the same alignment direction Dm, and the regions of the alignment layer 132 corresponding to the sub-pixel structures 120 all have the same alignment direction Dm. Specifically, the display medium layer 140 in the regions where the first sub-pixel region 120a and the second sub-pixel region 120b of the sub-pixel structure 120 are located all have the same alignment direction Dm. For example, in the present embodiment (such as Figure 1 ), the alignment directions Dm of the alignment layers 130 and 132 may be parallel to the second direction D2, but are not limited thereto. In addition, in some embodiments, the entire alignment layers 130 and 132 have parallel or anti-parallel alignment directions.

[0033] In order to enable the sub-pixel structure 120 to generate a suitable electric field and electric field direction to change the light (backlight) transmittance of the display medium layer 140 (for example, to rotate the liquid crystal molecules through the electric field), the first electrode 122 in the first sub-pixel area 120a has at least one first slit 122S, and the second electrode 124 in the second sub-pixel area 120b has at least one second slit 124S. Therefore, the first electrode 122 and the third electrode 126 can generate an electric field in the first sub-pixel area 120a that affects the rotation of the molecules (liquid crystal molecules) in the display medium layer 140, and the second electrode 124 and the fourth electrode 128 can generate an electric field in the second sub-pixel area 120b that affects the rotation of the molecules (liquid crystal molecules) in the display medium layer 140.

[0034] In order to make the display device 100 have an anti-peeping function, the design of the first slit 122S of the first electrode 122 in the first sub-pixel area 120a of the present invention is different from the design of the second slit 124S of the second electrode 124 in the second sub-pixel area 120b. In the present invention, since the first sub-pixel area 120a is used for conventional display and the second sub-pixel area 120b is used for display in the anti-peeping mode, the design of the first slit 122S needs to enable the first sub-pixel area 120a to have a good display effect (for example, high brightness, high contrast and / or wide viewing angle) when displaying, and the design of the second slit 124S needs to enable the second sub-pixel area 120b to have a smaller viewing angle when displaying. In detail, in this embodiment (such as Figure 1 ), the first slit 122S may extend along the first slit direction Ds1, and the second slit 124S may extend along the second slit direction Ds2, wherein the first slit direction Ds1 may be different from the second slit direction Ds2, so that the direction of the electric field generated by the first electrode 122 and the third electrode 126 may be different from the direction of the electric field generated by the second electrode 124 and the fourth electrode 128 (that is, the direction of the electric field on the first electrode 122 may be different from the direction of the electric field on the second electrode 124). For example, the angle between the first slit direction Ds1 and the second slit direction Ds2 may be greater than or equal to 20 degrees, but is not limited thereto. From another perspective, the first slit direction Ds1 and the alignment direction Dm of the alignment layer 130 (or the alignment layer 132) have a first angle θ1, and the second slit direction Ds2 and the alignment direction Dm of the alignment layer 130 (or the alignment layer 132) have a second angle θ2, and the first angle θ1 is different from the second angle θ2.

[0035] Please refer to Figures 3 to 16 , Figures 3 to 9 This is a simulation diagram of the brightness at different viewing angles for various slit directions of the electrode. Figures 10 to 16 is a simulation diagram of the contrast ratio of various viewing angles of the electrode in various slit directions, where Figures 3 to 16 The angle θ in is the angle between the slit direction and the alignment direction Dm of the alignment layer 130 (or alignment layer 132). Figures 3 to 16 Table 1 records the light transmittance, contrast and brightness ratio of various slit directions at an angle θ of 7 degrees.

[0036] [Table 1] Light transmittance in the slit direction, contrast, and brightness ratio at an angle θ of 7 degrees

[0037]

[0038]

[0039] exist Figures 3 to 9As shown in Table 1, it can be understood that when the difference between the angle θ and 7 degrees is larger, the luminance at each viewing angle is lower, so that the viewing angle of the display device 100 is reduced. Figures 10 to 16 As shown in Table 1, it can be understood that when the difference between the angle θ and 7 degrees is larger, the contrast of each viewing angle is lower, so that the viewing angle of the display device 100 is reduced. In addition, when the difference between the angle θ and 7 degrees is larger, if the user views the display device 100 at a smaller viewing angle, although the brightness and contrast are lower, the user can still see the display screen of the display device 100; if the user views the display device 100 at a larger viewing angle, the user will find it difficult to see the display screen of the display device 100, or even the user can hardly see the display screen of the display device 100. Therefore, the present invention uses this characteristic to perform anti-peeping design.

[0040] according to Figures 3 to 16 As shown in Table 1, the present invention makes the display device 100 have an anti-peeping function by designing the first angle θ1 between the first slit direction Ds1 and the alignment direction Dm to be different from the second angle θ2 between the second slit direction Ds2 and the alignment direction Dm. In some embodiments, the first angle θ1 may be less than the second angle θ2, but is not limited thereto. In some embodiments, the absolute value of the difference between the first angle θ1 and the second angle θ2 may be greater than or equal to 20 degrees, so that the display characteristics of the first sub-pixel area 120a and the second sub-pixel area 120b are greatly different, but is not limited thereto. In some embodiments, the first angle θ1 may be 4 to 10 degrees (for example, 7 degrees), and the second angle θ2 may be 30 to 70 degrees or 40 to 60 degrees (for example, 50 degrees) to obtain a good display effect and an anti-peeping effect, but is not limited thereto.

[0041] The display device 100 may also include any desired film layer and / or structure. In some embodiments, the display device 100 may also selectively include a backlight module, so that the substrate 110 is located between the backlight module and the opposite substrate 150 to provide backlight. In addition, the display device 100 may also selectively include a light blocking layer. The light blocking layer may have the property of light shielding and is disposed on the substrate 110 or the opposite substrate 150 according to requirements. Examples of the light blocking layer may include black photoresist, black ink, black resin, black pigment (pigment, dye), other suitable materials or combinations thereof. The light blocking layer is used, for example, to shield lower layer elements (e.g., opaque switch elements or wires) or to reduce the probability of external light being reflected by elements (e.g., opaque switch elements or wires) in the display device 100, but is not limited thereto. In some embodiments, the light blocking layer has a plurality of openings to define the light-emitting area of ​​the sub-pixel structure 120 and to separate the sub-pixel structure 120 in a top view.

[0042] In some embodiments, the display device 100 may further selectively include a color conversion layer, wherein the color conversion layer is used to convert the color of the received light. The color conversion layer may be disposed on the substrate 110 or the opposite substrate 150 as required, and corresponds to the light-emitting area of ​​the sub-pixel structure 120 in a top view, wherein the color conversion layer is located between the light-emitting surface of the display device 100 and the light-emitting element (e.g., backlight module) in the display device 100. In some embodiments, the color conversion layer may include a color filter, a quantum dot (QD) material, a fluorescence material, a phosphorescence material, other suitable materials or any combination thereof. In addition, the color conversion layer corresponding to different types of sub-pixel structures 120 may perform different light conversions. For example, the color conversion layer corresponding to the green sub-pixel structure may be used to convert the incident light into green light, the color conversion layer corresponding to the red sub-pixel structure may be used to convert the incident light into red light, and the color conversion layer corresponding to the blue sub-pixel structure may convert the incident light into blue light, but is not limited thereto. In addition, in some embodiments, the display device 100 may further selectively include an optical film layer, such as an anti-reflection film, a brightness enhancement film, a polarizer, other suitable film layers or any combination thereof, and the optical film layer may be disposed at any suitable position.

[0043] Please refer to Figures 17 to 19 , Fig.17 It is a schematic diagram of the signal of the scan line and the display conditions of the first sub-pixel area and the second sub-pixel area in the first display mode of the first embodiment of the present invention, Fig.18 is a schematic diagram of the signal of the scan line and the display conditions of the first sub-pixel area and the second sub-pixel area in the second display mode according to the first embodiment of the present invention, Fig.19 FIG. 1 is a schematic diagram of the signal of the scan line and the display of the first sub-pixel area and the second sub-pixel area in the anti-peeping mode of the first embodiment of the present invention. Figures 17 to 19 When the sub-pixel area in is drawn with a dotted background, it means that the sub-pixel area is in a display state; Figures 17 to 19 When a sub-pixel area in is drawn with a white background, it means that the sub-pixel area is in a stop display state. Figures 17 to 19 In the embodiment, the first scan line SC1 is used to provide a signal to the first switch element T1 of the first sub-pixel region 120a of the sub-pixel structure 120 in the first row, the second scan line SC2 is used to provide a signal to the second switch element T2 of the second sub-pixel region 120b of the sub-pixel structure 120 in the first row, the first scan line SC1' is used to provide a signal to the first switch element T1 of the first sub-pixel region 120a of the sub-pixel structure 120 in the second row, and the second scan line SC2' is used to provide a signal to the second switch element T2 of the second sub-pixel region 120b of the sub-pixel structure 120 in the second row. Figures 17 to 19 In the embodiment, the first timing sequence S1, the second timing sequence S2, the third timing sequence S3 and the fourth timing sequence S4 do not overlap with each other.

[0044] In the present invention, the display device 100 has a first display mode (eg, Fig.17 ), the second display mode (for example, Fig.18 ) and privacy mode (for example, Fig.19 ). When the display device 100 is in the first display mode, the first sub-pixel area 120a and the second sub-pixel area 120b display; when the display device 100 is in the second display mode, the first sub-pixel area 120a displays, and the second sub-pixel area 120b stops displaying; when the display device 100 is in the anti-peeping mode, the first sub-pixel area 120a stops displaying, and the second sub-pixel area 120b displays. The first display mode, the second display mode, and the anti-peeping mode are described in detail below, but it should be noted that the following operation methods for the three display modes of the present invention are only exemplary descriptions, and therefore, the operation methods of the first display mode, the second display mode, and the anti-peeping mode are not limited to the following.

[0045] like Fig.17 and Fig.18 As shown, in the first display mode and the second display mode, the first scan line SC1 can provide an on signal to the first switch element T1 of the first sub-pixel region 120a of the first row of sub-pixel structures 120 in the first timing S1, and the first scan line SC1' can provide an on signal to the first switch element T1 of the first sub-pixel region 120a of the second row of sub-pixel structures 120 in the third timing S3. Therefore, Fig.17 The first sub-pixel region 120a of all the sub-pixel structures 120 shown can display images according to the received display grayscale signal (provided by the data line DA). In the present invention, since the first slit 122S of the first electrode 122 of the first sub-pixel region 120a is designed to enable the first sub-pixel region 120a to have a good display effect when displaying, as long as the first sub-pixel region 120a displays images, the display device 100 can present a good image display effect.

[0046] In one embodiment, if Fig.17 As shown, when the display device 100 is in the first display mode, the second scan line SC2 can provide an on signal to the second switch element T2 of the second sub-pixel region 120b of the first row of sub-pixel structures 120 in the second timing S2, and the second scan line SC2' can provide an on signal to the second switch element T2 of the second sub-pixel region 120b of the second row of sub-pixel structures 120 in the fourth timing S4. Therefore, Fig.17The second sub-pixel region 120b of all sub-pixel structures 120 shown can also display images according to the received display grayscale signal (provided by the data line DA). The display characteristics of the first display mode can provide users with higher resolution (high resolution) and more hidden viewing angle (narrower viewing angle).

[0047] In another embodiment, if Fig.18 As shown, when the display device 100 is in the second display mode, the second scan line SC2 does not provide an on signal to the second switch element T2 of the second sub-pixel region 120b of the first row of sub-pixel structures 120, and the second scan line SC2' does not provide an on signal to the second switch element T2 of the second sub-pixel region 120b of the second row of sub-pixel structures 120. Therefore, Fig.18 The second sub-pixel regions 120b of all sub-pixel structures 120 shown stop displaying. In another embodiment, when the display device 100 is in the second display mode, the scan line SC can provide an on signal to the first switch element T1 and / or the second switch element T2 at a corresponding timing, and the data line DA provides the lowest display grayscale signal (e.g., 0 grayscale) to the second switch element T2, so that the second sub-pixel regions 120b of all sub-pixel structures 120 stop displaying.

[0048] like Fig.19 As shown, when the display device 100 is in the anti-peeping mode, the first scan line SC1 does not provide an on signal to the first switch element T1 of the first sub-pixel region 120a of the first row of sub-pixel structures 120, the second scan line SC2 provides an on signal to the second switch element T2 of the second sub-pixel region 120b of the first row of sub-pixel structures 120 in the second timing sequence S2, the first scan line SC1' does not provide an on signal to the first switch element T1 of the first sub-pixel region 120a of the second row of sub-pixel structures 120, and the second scan line SC2' provides an on signal to the second switch element T2 of the second sub-pixel region 120b of the second row of sub-pixel structures 120 in the fourth timing sequence S4. Therefore, Fig.19 The first sub-pixel regions 120a of all the sub-pixel structures 120 shown do not display, while the second sub-pixel regions 120b can display images according to the received display grayscale signal (provided by the data line DA). In the present invention, since the second slits 124S of the second electrodes 124 of the second sub-pixel regions 120b are designed to reduce the viewing angle caused by the second sub-pixel regions 120b when displaying, the display device 100 has a good anti-peeping effect when displaying in the anti-peeping mode.

[0049] In the anti-peeping mode of another embodiment, the scan line SC can provide an on signal to the first switch element T1 and / or the second switch element T2 at a corresponding timing, and the data line DA provides the lowest display grayscale signal (e.g., 0 grayscale) to the first switch element T1, so that the first sub-pixel area 120a does not display.

[0050] The display device of the present invention is not limited to the above-mentioned embodiment. Other embodiments and variant embodiments of the present invention will be further disclosed below. However, in order to simplify the description and highlight the differences between the embodiments and variant embodiments, the same reference numerals are used below to mark the same components, and the repeated parts will not be repeated.

[0051] Please refer to Fig. 20 , Fig. 20 FIG. 2 is a schematic top view of a transparent conductive layer according to a second embodiment of the present invention. Fig. 20 As shown, the difference between this embodiment and the first embodiment is that the display device 200 of this embodiment is an IPS liquid crystal display device, therefore, the first electrode 122 and the third electrode 126 of the first sub-pixel region 120a are formed by the same conductive layer, and the second electrode 124 and the fourth electrode 128 of the second sub-pixel region 120b are formed by the same conductive layer. Fig. 20 In the embodiment, the first electrode 122, the second electrode 124, the third electrode 126 and the fourth electrode 128 can be forked electrodes, so a portion of the third electrode 126 is located in the first slit 122S of the first electrode 122, and a portion of the fourth electrode 128 is located in the second slit 124S of the second electrode 124, but not limited thereto.

[0052] To summarize, in the present invention, since the first angle between the first slit direction and the alignment direction of the first electrode in the first sub-pixel area is designed to be different from the second angle between the second slit direction and the alignment direction of the second electrode in the second sub-pixel area, and the first switching element in the first sub-pixel area is connected to the second switching element in the second sub-pixel area by different scanning lines, the anti-peeping function can be performed by displaying or not in the sub-pixel area, without the need to additionally set up an external anti-peeping film or viewing angle control panel that would have an adverse effect on the thickness, weight and display brightness.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A display device, characterized in that: include: a substrate; a facing substrate, arranged opposite to the substrate; A plurality of sub-pixel structures are disposed on the substrate, wherein at least one of the sub-pixel structures comprises: a first sub-pixel region, comprising a first switch element and a first electrode, wherein the first electrode has at least one first slit, and the first slit extends along a first slit direction; and a second sub-pixel region, comprising a second switch element and a second electrode, wherein the second electrode has at least one second slit, and the second slit extends along a second slit direction; A plurality of scan lines are arranged on the substrate, wherein the plurality of scan lines include a first scan line and a second scan line, the first scan line is electrically connected to the first switch element, and the second scan line is electrically connected to the second switch element; a display medium layer, disposed on the plurality of sub-pixel structures, wherein the display medium layer is sandwiched between the substrate and the opposite substrate; and an alignment layer, disposed between the plurality of sub-pixel structures and the display medium layer, wherein the alignment layer has the same alignment direction in regions corresponding to the plurality of sub-pixel structures; There is a first angle between the first slit direction and the alignment direction, there is a second angle between the second slit direction and the alignment direction, and the first angle is smaller than the second angle.

2. The display device according to claim 1, wherein: An absolute value of a difference between the first angle and the second angle is greater than or equal to 20 degrees.

3. The display device according to claim 1, wherein: The first angle is 4 degrees to 10 degrees, and the second angle is 30 degrees to 70 degrees.

4. The display device according to claim 1, wherein: The direction of the electric field on the first electrode is different from the direction of the electric field on the second electrode.

5. The display device according to claim 1, wherein: The first electrode and the second electrode are separated from each other.

6. The display device according to claim 1, wherein: The first electrode and the second electrode are formed of the same conductive layer.

7. The display device according to claim 1, wherein: The first sub-pixel region further includes a third electrode. The first electrode and the third electrode are formed of a same conductive layer. A portion of the third electrode is located in the first slit of the first electrode.

8. The display device according to claim 1, wherein: The first sub-pixel region further includes a third electrode, and the first electrode is arranged between the third electrode and the display medium layer.

9. The display device according to claim 1, wherein: The first electrode is electrically connected to the first switching element, and the second electrode is electrically connected to the second switching element.

10. The display device according to claim 1, wherein: The first electrode and the second electrode are electrically connected to a common voltage source.

11. The display device according to claim 1, wherein: It also includes a plurality of data lines disposed on the substrate, wherein one of the plurality of data lines electrically connects the first switch element and the second switch element.

12. The display device according to claim 1, wherein: The display device has an anti-peeping mode. When the display device is in the anti-peeping mode, the first sub-pixel area stops displaying and the second sub-pixel area starts displaying.

13. The display device according to claim 12, wherein: When the display device is in the anti-peeping mode, the first scan line does not provide an on signal to the first switch element, and the second scan line provides an on signal to the second switch element in a timing sequence.

14. The display device according to claim 1, wherein: The display device has a first display mode. When the display device is in the first display mode, both the first sub-pixel region and the second sub-pixel region perform display.

15. The display device according to claim 14, wherein: When the display device is in the first display mode, the first scan line provides an on signal to the first switch element in a first timing sequence, and the second scan line provides an on signal to the second switch element in a second timing sequence, and the first timing sequence does not overlap with the second timing sequence.

16. The display device according to claim 1, wherein: The display device has a second display mode. When the display device is in the second display mode, the first sub-pixel area performs display and the second sub-pixel area stops displaying.

17. The display device according to claim 16, wherein: When the display device is in the second display mode, the first scan line provides an on signal to the first switch element in a timing sequence, and the second scan line does not provide an on signal to the second switch element.

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