Display device

Abstract

A display device includes a backlight module for emitting light, a first panel and a second panel arranged on the backlight module. The first panel includes a color filter layer and a first black matrix. The second panel includes a second black matrix, a driving electrode arranged on the second black matrix, a common electrode arranged on the second black matrix and the driving electrode, and a liquid crystal layer arranged between the common electrode and the driving electrode. The first black matrix and the second black matrix are offset from each other. The common electrode has a light incident side and a light exit side opposite to the light incident side, and the light incident side has grooves distributed along the second black matrix and located on the transmission path of the light. The liquid crystal layer fills the grooves.

Description

Technical Field

[0001] The present disclosure relates to a display device, and more particularly to a multi-layer display device having a plurality of panels. Background Art

[0002] The existing display technology has developed a multi-layer display device that can be composed of multiple panels stacked together, wherein these panels are all liquid crystal display panels and have a black matrix. However, after the panels are stacked together, there may be a slight displacement between the panels, so that the black matrices in different panels cannot be well aligned and interference patterns are generated when displaying images, affecting the display quality. Therefore, the existing multi-layer display device still needs to be improved. Summary of the invention

[0003] According to some embodiments of the present disclosure, a display device includes a backlight module for emitting light, a first panel and a second panel arranged on the backlight module. The first panel includes a color filter layer and a first black matrix. The second panel includes a second black matrix, a driving electrode arranged on the second black matrix, a common electrode arranged on the second black matrix and the driving electrode, and a liquid crystal layer arranged between the common electrode and the driving electrode. The first black matrix and the second black matrix are offset from each other. The common electrode has a light incident side and a light exit side opposite to the light incident side, and the light incident side has grooves distributed along the second black matrix and located on the transmission path of the light. The liquid crystal layer fills the grooves.

[0004] In some embodiments, the offset ratio between the first black matrix and the second black matrix is ​​between 5% and 60%, and the offset ratio is the distance between the center position of the first black matrix and the center position of the second black matrix relative to the width of the second black matrix.

[0005] In some embodiments, the common electrode includes a planar region, and the groove surrounds the planar region.

[0006] In some embodiments, the driving electrode includes a first sub-electrode located directly below the groove, and a second sub-electrode located directly below the plane area. The first sub-electrode and the second sub-electrode are spaced apart from each other.

[0007] In some embodiments, a first distance exists between a central portion of the groove and the first sub-electrode, a second distance exists between an edge of the groove and the second sub-electrode, and the first distance is greater than the second distance.

[0008] In some embodiments, a ratio of a cross-sectional width of the groove to a cross-sectional width of the second black matrix is ​​between 1.5 and 3.5.

[0009] In some embodiments, the surface shape of the groove is a cylindrical surface or a prism surface.

[0010] In some embodiments, the display device further includes a transparent layer. The transparent layer is disposed on the light-emitting side of the common electrode and has a concave surface, wherein the groove of the common electrode conforms to the concave surface.

[0011] In some embodiments, the common electrode directly contacts the transparent layer.

[0012] In some embodiments, the second panel is disposed between the backlight module and the first panel.

[0013] The display device provided by the embodiment of the present disclosure has a groove on the common electrode to provide a lens-like effect, thereby reducing the generation of interference fringes and improving the image quality of the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The following embodiments are read in conjunction with the accompanying drawings to clearly understand the concepts of the present disclosure. It should be noted that, in accordance with standard industry practice, various features are not drawn to scale. In fact, the dimensions of various features may be arbitrarily enlarged or reduced for clarity of discussion. Furthermore, the same reference numerals represent the same elements.

[0015] Figure 1 A cross-sectional view of a display device is shown according to some embodiments of the present disclosure.

[0016] Figure 2 The following is a schematic diagram showing light passing through a lens region according to some embodiments of the present disclosure.

[0017] Figure 3 A top view of a groove is shown according to some embodiments of the present disclosure.

[0018] Figure 4A A top view of a black matrix is ​​shown according to some embodiments of the present disclosure.

[0019] Figure 4B A light-transmitting schematic diagram of a black matrix is ​​shown according to some embodiments of the present disclosure.

[0020] Figure 4C The following is a schematic diagram showing the display of light after it passes through the filter of the first panel according to some embodiments of the present disclosure.

[0021] Figure 5 A graph showing period / angle and contrast sensitivity of a display image is shown according to some embodiments of the present disclosure.

[0022] Figure 6 A graph showing the ratio of black matrix transmittance to contrast sensitivity is shown according to some embodiments of the present disclosure.

[0023] Figure 7 A graph showing the offset ratio and the black matrix transmittance when no interference fringe is detected is shown according to some embodiments of the present disclosure.

[0024] Figure 8 Cross-sectional views of display devices are shown according to other embodiments of the present disclosure.

[0025] Fig. 9 Cross-sectional views of display devices are shown according to other embodiments of the present disclosure.

[0026] Fig.10 Cross-sectional views of display devices are shown according to other embodiments of the present disclosure.

[0027] The reference numerals are described as follows:

[0028] 1: Display device

[0029] 2: Display device

[0030] 3: Display device

[0031] 4: Display device

[0032] 100: First Panel

[0033] 110: First substrate

[0034] 120: Second substrate

[0035] 130: First liquid crystal layer

[0036] 140: Color filter layer

[0037] 142: First filter

[0038] 144: Second filter

[0039] 146: The third filter

[0040] 150: First Black Matrix

[0041] 160: Component array layer

[0042] 162: Pixel electrode

[0043] 164: Control elements

[0044] 170: Shared electrode

[0045] 200: Second panel

[0046] 210: The third substrate

[0047] 220: Fourth substrate

[0048] 230: Second liquid crystal layer

[0049] 240: Translucent layer

[0050] 242: Area

[0051] 250: Second black matrix

[0052] 260: Component array layer

[0053] 262: Driving electrode

[0054] 262A: First sub-electrode

[0055] 262B: Second sub-electrode

[0056] 264: Control elements

[0057] 264A: First sub-element

[0058] 264B: Second sub-element

[0059] 266A: First data line

[0060] 266B: Second data line

[0061] 270: Shared Electrode

[0062] 272: Groove

[0063] 274: Plane Area

[0064] 280: Transparent layer

[0065] 282: Concave

[0066] 290: Insulation layer

[0067] 300: Backlight module

[0068] 400: First polarizer

[0069] 402: Region

[0070] 404: Region

[0071] 406: Region

[0072] 408: Region

[0073] 500: Second polarizer

[0074] 502: Line

[0075] 504: Fast Fourier Transform

[0076] 600: Third polarizer

[0077] 602: Line

[0078] 700: Fourth polarizer

[0079] A: Data Group

[0080] B: Data Group

[0081] D: Distance

[0082] I: Light

[0083] S1: First distance

[0084] S2: Second distance

[0085] W1: Width

[0086] W2: Width DETAILED DESCRIPTION

[0087] When an element such as a layer, film, region, or substrate is referred to as being "on" or "connected to" another element, it may be directly on or connected to another element, or an intermediate element may also exist. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intermediate elements. As used herein, "connection" may refer to physical and / or electrical connection. Furthermore, "electrical connection" or "coupling" may refer to the presence of other elements between two elements.

[0088] In addition, relative terms such as "lower" or "bottom" and "upper" or "top" may be used herein to describe the relationship of one element to another element, as shown in the figures. It should be understood that relative terms are intended to include different orientations of the device in addition to the orientation shown in the figures. For example, if the device in one figure is turned over, the element described as being on the "lower" side of the other elements will be oriented on the "upper" side of the other elements. Therefore, the exemplary term "lower" can include both "lower" and "upper" orientations, depending on the specific orientation of the figure. Similarly, if the device in one figure is turned over, the element described as being "below" or "below" other elements will be oriented as being "above" other elements. Therefore, the exemplary term "below" or "below" can include both above and below orientations.

[0089] It is understood that the words first, second, third, etc. are used herein to describe various elements, components, regions, layers, and / or blocks. However, these elements, components, regions, layers, and / or blocks should not be limited by these words. These words are limited to identifying a single element, component, region, layer, and / or block. Therefore, a first element, component, region, layer, and / or block hereinafter may also be referred to as a second element, component, region, layer, and / or block without departing from the original intention of the present disclosure.

[0090] As used herein, "about," "approximately," or "substantially" includes the stated value and the mean within an acceptable deviation range for the particular value as determined by one of ordinary skill in the art, taking into account the measurement in question and the particular amount of error associated with the measurement (i.e., the limitations of the measurement system). For example, "about" can mean within one or more standard deviations of the stated value.

[0091] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and the present disclosure, and will not be interpreted as an idealized or overly formal meaning unless explicitly defined as such herein.

[0092] In existing multi-layer display devices, when multiple panels are not fully aligned, the brightness variation caused by the upper and lower black matrices is likely to generate interference patterns (e.g., moiré patterns), which is not conducive to image quality. The present disclosure provides a display device, in which a common electrode with grooves provides a lens-like effect, thereby adjusting the light transmittance of the black matrix and reducing the brightness variation caused by the upper and lower matrices, thereby reducing the generation of interference patterns and improving the image quality of the display device.

[0093] Please refer to Figure 1 . Figure 1 A cross-sectional view of a display device 1 is shown according to some embodiments of the present disclosure. Figure 1 As shown, the display device 1 includes a first panel 100, a second panel 200 and a backlight module 300, wherein the first panel 100 and the second panel 200 can be arranged on the backlight module 300. The backlight module 300 is configured to emit light I, and the first panel 100 and the second panel 200 can be arranged on a side of the backlight module 300 that emits the light I. Specifically, the backlight module 300 can use a direct light source or an edge-entry light source to provide the light source required by the display device. In some embodiments, the second panel 200 is arranged between the backlight module 300 and the first panel 100. In other embodiments, the first panel 100 is arranged between the backlight module 300 and the second panel 200.

[0094] The first panel 100 may include a first substrate 110, a second substrate 120 and a first liquid crystal layer 130, wherein the first liquid crystal layer 130 is disposed between the first substrate 110 and the second substrate 120. The first substrate 110 and the second substrate 120 may both be transparent substrates, such as glass plates or transparent plastic plates.

[0095] The first panel 100 may further include a color filter layer 140 and a first black matrix 150, wherein the color filter layer 140 and the first black matrix 150 are disposed between the first substrate 110 and the first liquid crystal layer 130, and the first black matrix 150 is distributed in the color filter layer 140. Figure 1 In the illustrated embodiment, the color filter layer 140 may include a plurality of filters, such as a first filter 142, a second filter 144, and a third filter 146. The first black matrix 150 may be a mesh structure, and each filter may be located within a grid of the first black matrix 150. In some embodiments, the first filter 142, the second filter 144, and the third filter 146 constitute a pixel, but the present disclosure is not limited to this number (i.e., three filters).

[0096] The first panel 100 further includes a device array layer 160 and a common electrode 170. The device array layer 160 may be disposed on the second substrate 120 and may be interposed between the second substrate 120 and the first liquid crystal layer 130. The common electrode 170 may be disposed under the first substrate 110 and may be interposed between the color filter layer 140 and the first liquid crystal layer 130. In other words, the device array layer 160 and the common electrode 170 are both located between the first substrate 110 and the second substrate 120, and are respectively disposed on opposite sides of the first liquid crystal layer 130. In some embodiments, the common electrode 170 covers the color filter layer 140 and the first black matrix 150.

[0097] Specifically, the first panel 100 further includes a plurality of pixel electrodes 162 disposed in the element array layer 160. In some embodiments, each pixel electrode 162 corresponds to each filter. Figure 1 In the embodiment, each pixel electrode 162 corresponds to the first filter 142, the second filter 144 and the third filter 146. The pixel electrode 162 can be a transparent conductive layer, which can be made of metal oxide, wherein the metal oxide is, for example, indium tin oxide (ITO), indium zinc oxide (IZO) or the like. The common electrode 170 can also be a transparent conductive layer, which can be made of the above metal oxide.

[0098] The device array layer 160 may further include a plurality of control devices 164, wherein the control devices 164 are electrically connected to the pixel electrodes 162 to control the pixel electrodes 162. The control devices 164 may be transistors. In some embodiments, the control devices 164 may be thin film transistors (TFTs) and may be formed by stacking multiple film layers. In some embodiments, the control devices 164 may be not only thin film transistors, but also field-effect transistors (FETs).

[0099] The control element 164 can be connected to a power source (not shown) and provide a working bias voltage, so that an electric field is generated between a portion of the pixel electrodes 162 and the common electrode 170 , thereby regulating the liquid crystal molecules in a portion of the first liquid crystal layer 130 .

[0100] The second panel 200 may include a third substrate 210, a fourth substrate 220 and a second liquid crystal layer 230, wherein the second liquid crystal layer 230 is disposed between the third substrate 210 and the fourth substrate 220. The third substrate 210 and the fourth substrate 220 may both be transparent substrates, such as glass plates or transparent plastic plates.

[0101] The second panel 200 may further include a light-transmitting layer 240 and a second black matrix 250, wherein the light-transmitting layer 240 and the second black matrix 250 are disposed between the fourth substrate 220 and the second liquid crystal layer 230, and the second black matrix 250 is distributed in the light-transmitting layer 240. The light-transmitting layer 240 may be separated into a plurality of regions, such as region 242, by the second black matrix 250. In some embodiments, a single region of the light-transmitting layer 240 may correspond to a plurality of filters in the color filter layer 140, that is, a single region of the light-transmitting layer 240 may overlap with a plurality of filters.

[0102] In such Figure 1 In the illustrated embodiment, the region 242 of the light-transmitting layer 240 may correspond to the first color filter 142, the second color filter 144, and the third color filter 146, wherein the first color filter 142, the second color filter 144, and the third color filter 146 constitute a pixel, but the present disclosure is not limited thereto. For example, in other embodiments, the region 242 of the light-transmitting layer 240 may correspond to a plurality of pixels, that is, a region 242 may overlap with a plurality of pixels, wherein each pixel may be composed of a plurality of color filters.

[0103] It is worth noting that in Figure 1In the embodiment shown, the first panel 100 and the second panel 200 are not fully aligned, resulting in the first black matrix 150 of the first panel 100 and the second black matrix 250 of the second panel 200 not being aligned with each other. In other words, the center position of the first black matrix 150 and the center position of the second black matrix 250 do not overlap due to the offset, such as Figure 1 The dashed lines shown do not overlap.

[0104] For example, in Figure 1 In the embodiment, the first black matrix 150 and the second black matrix 250 are offset from each other so that the central position of the first black matrix 150 and the central position of the second black matrix 250 are separated by a distance D, wherein the ratio of the distance D to the width W of the second black matrix 250 (i.e., D / W×100%) can be regarded as the offset ratio (unitless) between the first black matrix 150 and the second black matrix 250. In some embodiments, the offset ratio between the first black matrix 150 and the second black matrix 250 may be between about 5% and about 60%. It should be noted that the above range is a possible common offset ratio range, but the present disclosure is not particularly limited thereto. In actual operation, the offset ratio between the black matrices still depends on the operating accuracy of the process.

[0105] The second panel 200 further includes a device array layer 260 and a common electrode 270. The device array layer 260 may be disposed on the fourth substrate 220 and may be between the fourth substrate 220 and the second liquid crystal layer 230. The common electrode 270 may be disposed between the third substrate 210 and the second liquid crystal layer 230. In other words, the device array layer 260 and the common electrode 270 are both located between the third substrate 210 and the fourth substrate 220 and are respectively disposed on opposite sides of the second liquid crystal layer 230. In some embodiments, the device array layer 260 may be distributed on the light-transmitting layer 240.

[0106] Specifically, the second panel 200 further includes a plurality of driving electrodes 262 disposed in the element array layer 260. The driving electrode 262 may be a transparent conductive layer, which may be made of a metal oxide, wherein the metal oxide is, for example, indium tin oxide (ITO), indium zinc oxide (IZO) or the like. The driving electrode 262 includes a first sub-electrode 262A and a second sub-electrode 262B, wherein the first sub-electrode 262A is disposed on the light-transmitting layer 240, and the second sub-electrode 262B is disposed on the second black matrix 250. The first sub-electrode 262A and the second sub-electrode 262B are spaced apart from each other and are not directly electrically connected to each other.

[0107] The element array layer 260 may further include a plurality of control elements 264, wherein the control elements 264 are respectively electrically connected to the drive electrodes 262 to control the drive electrodes 262. The control element 264 may be a transistor. In some embodiments, the control element 264 may be a thin film transistor (TFT), and may be formed by stacking multiple film layers. In some embodiments, the control element 264 may not only be a thin film transistor, but also a field-effect transistor (FET). Similarly, the control element 264 includes a first sub-element 264A and a second sub-element 264B, wherein the first sub-element 264A may be electrically connected to the first sub-electrode 262A, and the second sub-element 264B may be electrically connected to the second sub-electrode 262B.

[0108] The common electrode 270 is disposed above the second black matrix 250, the driving electrode 262, and the second liquid crystal layer 230. The second liquid crystal layer 230 is sandwiched between the common electrode 270 and the driving electrode 262. The common electrode 270 may be a transparent conductive layer, which may be made of a metal oxide, such as indium tin oxide (ITO), indium zinc oxide (IZO), or the like.

[0109] The common electrode 270 includes a light incident side and a light exiting side opposite to the light incident side, wherein the light incident side receives the light I emitted from the backlight module 300, and the light I passes through the common electrode 270 and exits from the light exiting side. Figure 1 In the illustrated embodiment, the light incident side of the common electrode 270 has a groove 272, wherein the groove 272 is recessed from the light incident side to the light exiting side. In some embodiments, the light I emitted by the backlight module 300 may also pass through the groove 272. In other words, the groove 272 is on the transmission path of the light I. In some embodiments, the second liquid crystal layer 230 may also be distributed in the groove 272. In some further embodiments, the second liquid crystal layer 230 may fill the groove 272.

[0110] The groove 272 may be located directly above the second black matrix 250. In some embodiments, the groove 272 is distributed along the second black matrix 250. The common electrode 270 further includes one or more plane regions 274, wherein the groove 272 surrounds the plane region 274. The plane region 274 may be located on the light-transmitting layer 240, for example, directly above the region 242.

[0111] As described above, the driving electrode 262 includes a first sub-electrode 262A and a second sub-electrode 262B, wherein the first sub-electrode 262A may be located directly below the groove 272, and the second sub-electrode 262B may be located directly below the plane area 274. When the first sub-electrode 264A and the second sub-electrode 264B of the control element 264 can be connected to a power source (not shown) and provide a working bias, since the first sub-electrode 262A and the second sub-electrode 262B are not directly electrically connected to each other, there will be no short circuit when power is supplied, so that the electric field established between the first sub-electrode 262A and the plane area 274 can be different from the electric field established between the second sub-electrode 262B and the groove 272, thereby partially controlling the second liquid crystal layer 230. In some embodiments, the first sub-electrode 262A and the second sub-electrode 262B are coplanar.

[0112] The element array layer 260 may further include a first data line 266A and a second data line 266B. The first data line 266A and the second data line 266B are located under the second black matrix 250. The first sub-element 264A may be connected to the first data line 266A, and the second sub-element 264B may be connected to the second data line 266B. The second panel 200 may further include an insulating layer 290 covering the driving electrode 262.

[0113] The second liquid crystal layer 230 in the groove 272 can provide a lens-like effect, and thus can be referred to as a lens region. When the light I passes through the lens region, it will be deflected. Figure 2 , Figure 2 FIG. 1 is a schematic diagram showing a light ray I passing through a lens region according to some embodiments of the present disclosure, wherein Figure 2 The structure shown is Figure 1 For convenience of explanation, Figure 2 The light ray I shown in FIG. 1 is simplified to clearly show the path of the light ray I. Figure 2 As shown, the light I emitted by the backlight module 300 is incident on the lens area, and the light I is deflected by the lens area.

[0114] Generally speaking, light usually cannot pass through the black matrix in the panel, so the position corresponding to the black matrix in the display device may have a lower brightness (opaque). When multiple panels are not fully aligned, the brightness changes caused by the upper and lower black matrices are prone to produce interference patterns (for example, moiré patterns), which is not conducive to display quality. The present disclosure provides a lens-like effect by forming a groove 272 in the common electrode 270 and filling the groove 272 with the second liquid crystal layer 230. The above configuration can cause light I to pass through the lens area and be deflected, thereby improving the transmittance of light I through the second black matrix 250, eliminating the brightness changes caused by the upper and lower black matrices (the first black matrix 150 and the second black matrix 250), reducing the generation of interference patterns, and improving display quality, which will be further explained later.

[0115] In order to allow more light I to pass through the groove 272 and the second liquid crystal layer 230 (i.e., the lens area) in the groove 272, the width W2 of the groove 272 can be designed to be greater than the width W1 of the second black matrix 250. As mentioned above, the groove 272 can be located directly above the second black matrix 250. Alternatively, the groove 272 can be distributed along the second black matrix 250. Therefore, in this embodiment, the projection of the groove 272 will overlap with the projection of the second black matrix 250. For example, please refer to Figure 3 , Figure 3 A top view of the groove 272 is shown according to some embodiments of the present disclosure, wherein the dotted line portion is the position of the second black matrix 250 located below, which is located within the configuration range of the groove 272. In order to clearly present the configuration relationship between the groove 272 and the second black matrix 250, other elements and structures have been omitted.

[0116] It should be noted that the width described herein refers to the cross-sectional width, wherein the cross section of the cross-sectional width is substantially perpendicular to the direction in which the element extends, and the cross-sectional position of the cross-sectional width varies with the direction in which the element extends, such as Figure 3 In some embodiments, the ratio of the width W2 of the groove 272 to the width W1 of the second black matrix 250 is between about 1.5 and about 3.5.

[0117] Please go back Figure 2 , the light I may pass through the groove 272 and the second liquid crystal layer 230 (ie, the lens area) in the groove 272 and be deflected in a specific direction (eg Figure 2 In some embodiments, the cross-sectional shape of the groove 272 can be designed such that the central portion is more concave than the edge, for example, a semi-elliptical shape (i.e. Figure 2), semicircular, triangular, parabolic, or other suitable shapes, so that the light I is deflected in the focusing direction through the lens area to improve the penetration rate of the second black matrix 250. In other words, the first distance S1 between the central portion of the groove 272 and the second sub-electrode 262B is greater than the second distance S2 between the edge of the groove 272 and the second sub-electrode 262B. In other embodiments, the surface shape of the groove 272 is a cylindrical surface or a prismatic surface. It should be noted that the cross-section of the cross-sectional morphology described herein is substantially the same as the cross-section of the cross-sectional width, that is, the cross-section of the cross-sectional morphology is perpendicular to the direction in which the element extends.

[0118] Please go back Figure 1 In addition to deflecting the light I in a specific direction by the cross-sectional morphology of the groove 272, the refraction angle of the light I passing through the second liquid crystal layer 230 (i.e., the lens area) in the groove 272 can also be adjusted by changing the arrangement of the liquid crystal molecules in the second liquid crystal layer 230. As mentioned above, when the second sub-element 264B can be connected to a power source (not shown), the output working bias voltage can be adjusted to establish a corresponding electric field between the second sub-electrode 262B and the groove 272 of the common electrode 270, thereby adjusting the deflection angle of the light I passing through.

[0119] The second panel 200 further includes a transparent layer 280, wherein the transparent layer 280 is disposed between the common electrode 270 and the third substrate 210. Specifically, the transparent layer 280 is sandwiched between the light-emitting side of the common electrode 270 and the third substrate 210. The transparent layer 280 has a concave surface 282 through a patterning process, and such a configuration can help form a common electrode 270 having a groove 272. The transparent layer 280 can be composed of an organic material to facilitate the operation of the patterning process. In some embodiments, the common electrode 270 is directly formed on the transparent layer 280 and directly contacts the transparent layer 280, so that the groove 272 of the common electrode 270 can conform to the concave surface 282 of the transparent layer 280. Therefore, the concave surface 282 of the transparent layer 280 can define the configuration of the groove 272 of the common electrode 270.

[0120] The present disclosure forms a common electrode 270 having a groove 272 by using a transparent layer 280 having a concave surface 282, and fills the groove 272 with a second liquid crystal layer 230 to form a lens area in the second panel 200. Therefore, the display quality can be improved while substantially maintaining the thickness of the display device 1.

[0121] The display device 1 further includes a first polarizer 400, a second polarizer 500, and a third polarizer 600, which are configured to change the polarization direction of light and convert non-polarized light into polarized light. Figure 1In the embodiment, the first polarizer 400 is located between the second panel 200 and the backlight module 300, the second polarizer 500 is located between the first panel 100 and the second panel 200, and the third polarizer 600 is located on the first panel 100. In some embodiments, the polarization directions of the aforementioned polarizers may be perpendicular to each other.

[0122] Please refer to Figure 4A and Figure 4B , Figure 4A A top view of the second black matrix 250 is shown according to some embodiments of the present disclosure, and Figure 4B A light-transmitting schematic diagram of the second black matrix 250 is shown according to some embodiments of the present disclosure. Figure 4A and Figure 4B It should be noted that in Figure 4B In FIG. 4 , the region 402 is light-transmissive corresponding to the second black matrix 250, and the region 404 is light-transmissive corresponding to the non-second black matrix 250 (eg, Figure 1 In the embodiment, the light I may pass through the light-transmitting layer 240 where the second black matrix 250 is not provided).

[0123] As before Figure 1 As described in , when light (e.g., light I emitted by the backlight module 300) passes through the second liquid crystal layer 230 (i.e., the lens area) in the groove 272, the light I will be deflected, thereby increasing the penetration rate of the light I passing through the second black matrix 250. Because the grooves 272 are designed to be distributed along the second black matrix 250, the distribution of the region 402 may be similar to Figure 4A Furthermore, since the light is deflected and the second black matrix produces a light-transmitting effect, the brightness of the area 402 (indicated by a dotted background) is lower than that of the area 404 (indicated by a no-background).

[0124] Please refer to Figure 4C , Figure 4C To illustrate the light (eg, the light I emitted by the backlight module 300) passing through the color filter layer 140 of the first panel 100 (see Figure 1 ) is a schematic diagram showing the display after each filter. It should be noted that Figure 4C In FIG. 4 , the region 406 is light-transmissive corresponding to the second black matrix 250, and the region 408 is light-transmissive corresponding to the non-second black matrix 250 (eg, Figure 1 In the embodiment, the light I may pass through the light-transmitting layer 240 where the second black matrix 250 is not provided).

[0125] As before Figure 1As described in the figure, when light (for example, light I emitted by the backlight module 300) passes through the second liquid crystal layer 230 (i.e., the lens area) in the groove 272, the light I will be deflected, thereby increasing the transmittance of the light I through the second black matrix 250. Since the transmittance of the second black matrix 250 is increased, the brightness of the area 404 (represented by the dotted grid background) can be displayed, which helps to improve the display quality.

[0126] Please refer to Figure 5 , Figure 5 A graph showing the period / angle (unitless) and contrast sensitivity (unitless) of a displayed image is shown in accordance with some embodiments of the present disclosure. Figure 5 In the graph shown, line 502 is the boundary of whether interference fringes in the display device can be detected. The lower left of line 502 indicates "interference fringes can be detected", and the upper right of line 502 indicates "interference fringes cannot be detected". Data group A is the data point of the black matrix nature, which is not affected by the black matrix penetration rate; data group B is the data point caused by the upper and lower black matrix offset, which is affected by the black matrix penetration rate.

[0127] When the display device of the present disclosure is used, the black matrix transmittance can be improved because the liquid crystal layer of the present disclosure fills the groove of the common electrode and can provide a lens-like effect. In this way, the black matrix transmittance can be adjusted, for example, by increasing the black matrix transmittance, so that the data point moves to the "undetectable interference fringe" area at the upper right of line 502. The method of adjusting the black matrix may include using grooves of different morphologies or locally controlling the arrangement direction of the liquid crystal in the groove, as described above.

[0128] Figure 5 The fast Fourier transform (FFT) 504 of the image of all data points distributed in space is also shown. In the figure shown by the fast Fourier transform 504, only the distribution points of data group A can be observed. In contrast, the distribution points of data group B cannot be observed in the fast Fourier transform 504 due to insufficient intensity.

[0129] Figure 6 A graph of black matrix transmittance (unitless) and contrast sensitivity ratio (normalized) (unitless) at different offset ratios is shown according to some embodiments of the present disclosure, wherein the offset ratio is defined as Figure 1 Described in Figure 6 In the graph shown, line 602 is the boundary of whether interference fringes in the display device can be detected. A position below line 602 indicates "interference fringes can be detected", and a position above line 602 indicates "interference fringes cannot be detected". Figure 6As shown, all different offset ratios have similar trends: as the black matrix transmittance increases, the contrast sensitivity ratio (normalization) increases.

[0130] Figure 7 A graph showing the offset ratio and the black matrix transmittance when no interference fringe is detected is shown according to some embodiments of the present disclosure. Figure 7 Describes the black matrix penetration rate corresponding to different offset ratios when the interference pattern cannot be detected.

[0131] When the offset ratio of the lower black matrix to the upper black matrix is ​​about 5.6%, the black matrix penetration rate can be adjusted to at least about 88%, so that the interference pattern formed by the offset of the lower black matrix to the upper black matrix cannot be detected. When the offset ratio of the lower black matrix to the upper black matrix is ​​about 11%, the black matrix penetration rate can be adjusted to at least about 94%, so that the interference pattern formed by the offset of the lower black matrix to the upper black matrix cannot be detected.

[0132] When the offset ratio of the lower and upper black matrices is about 56%, the black matrix transmittance can be adjusted to at least about 98%, so that the interference pattern formed by the offset of the lower and upper black matrices cannot be detected. In other words, when the offset ratio of the upper and lower black matrices is larger, the black matrix transmittance increases accordingly, so that the interference pattern formed by the offset of the lower and upper black matrices cannot be detected.

[0133] Figure 8 A cross-sectional view of a display device 2 is shown according to other embodiments of the present disclosure. The display device 2 is substantially the same as the display device 1, except that the display device 2 is not provided with a light-transmitting layer 240, so the first sub-electrode 262A is lower than the second sub-electrode 262B. In other words, the first sub-electrode 262A is not coplanar with the second sub-electrode 262B.

[0134] Fig. 9 A cross-sectional view of a display device 3 is shown according to some other embodiments of the present disclosure. The display device 3 is substantially the same as the display device 1, except that the display device 3 further includes a fourth polarizer 700, which is disposed under the first panel 100 and between the first panel 100 and the second panel 200. The second polarizer 500 is disposed on the second panel 200 and between the first panel 100 and the second panel 200. The positions of the second polarizer 500 and the fourth polarizer 700 can be swapped.

[0135] Fig.10A cross-sectional view of a display device 4 is shown according to some other embodiments of the present disclosure. The display device 4 is substantially the same as the display device 2, except that the display device 4 further includes a fourth polarizer 700 disposed under the first panel 100 and between the first panel 100 and the second panel 200. The second deflection plate 500 is disposed on the second panel 200 and between the first panel 100 and the second panel 200.

[0136] In summary, the present disclosure provides a display device having a common electrode with grooves, which can provide a lens-like effect to adjust the light transmittance of the black matrix and reduce the brightness variation caused by the upper and lower matrices, thereby reducing the generation of interference fringes and improving the display quality of the display device.

[0137] The above briefly describes the features of several embodiments of the present disclosure, so that those with ordinary knowledge in the relevant technical field can more easily understand the present disclosure. Anyone with ordinary knowledge in the relevant technical field should understand that this specification can easily serve as a basis for the change or design of other structures or processes to achieve the same purpose and / or obtain the same advantages as the embodiments of the present disclosure. Anyone with ordinary knowledge in the relevant technical field can also understand that the structures equivalent to the above do not depart from the spirit and scope of protection of the present disclosure, and can be changed, replaced and modified without departing from the spirit and scope of the present disclosure.

Claims

1. A display device, comprising: A backlight module, used for emitting light; A first panel, disposed on the backlight module, and comprising a color filter layer and a first black matrix; as well as A second panel, disposed on the backlight module, comprising: a second black matrix, wherein the first black matrix and the second black matrix are offset from each other; A driving electrode, disposed on the second black matrix; a common electrode, disposed on the second black matrix and the driving electrode, comprising a light incident side and a light emitting side opposite to the light incident side, wherein the light incident side has a groove, the groove is distributed along the second black matrix and is located on the transmission path of the light; and a liquid crystal layer, disposed between the common electrode and the driving electrode and filling the groove; The common electrode includes a plane area, and the groove surrounds the plane area. The driving electrode comprises: a first sub-electrode, located directly below the groove; and A second sub-electrode is located directly below the plane region, wherein the first sub-electrode and the second sub-electrode are spaced apart from each other.

2. The display device as described in claim 1, wherein an offset ratio between the first black matrix and the second black matrix is ​​between 5% and 60%, and the offset ratio is the distance between the central position of the first black matrix and the central position of the second black matrix relative to the width of the second black matrix.

3. The display device as claimed in claim 1, wherein a first distance exists between a central portion of the groove and the first sub-electrode, a second distance exists between an edge of the groove and the second sub-electrode, and the first distance is greater than the second distance. 4 . The display device as claimed in claim 1 , wherein a ratio of a cross-sectional width of the groove to a cross-sectional width of the second black matrix is ​​between 1.5 and 3.

5. The display device as claimed in claim 1 , wherein a surface shape of the groove is a cylindrical surface or a prism surface.

6. The display device according to claim 1, further comprising: A transparent layer is disposed on the light-emitting side of the common electrode and has a concave surface, wherein the groove of the common electrode is conformal to the concave surface. The display device as claimed in claim 6 , wherein the common electrode directly contacts the transparent layer. 8 . The display device as claimed in claim 1 , wherein the second panel is disposed between the backlight module and the first panel.

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