Patent Publication Number: US-2022221755-A1

Title: Display device

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application claims the benefits of the Chinese Patent Application Serial Number 202110039247.4, filed on Jan. 12, 2021, the subject matter of which is incorporated herein by reference. 
     BACKGROUND 
     1. Field 
     The present disclosure related to a display device. More specifically, the present disclosure relates to a display device with a camera under display (CUD) or a face recognizer under display (FRUD). 
     2. Description of Related Art 
     Display devices are widely used. For example, cell phones, laptops, cameras, cameras, music players, mobile navigation devices, TVs, etc. used in daily life use the display devices. 
     As the development of display devices continues to progress, display devices no longer simply display images, but also have other functions. For example, a display device integrated with a camera or a face recognizer has been developed. However, if the camera or face recognition function is to be performed on the display side, part of the display area is often sacrificed, resulting in a reduction in the screen-to-body ratio of the display device. 
     Therefore, if a display device with a camera under display or a face recognizer under display can be developed, the screen-to-body ratio of the display device can be increased to meet the needs of consumers. 
     SUMMARY 
     The present disclosure provides a display device, comprising a first pixel region and a second pixel region adjacent to the first pixel region. The display device of the present disclosure comprises: a first substrate; a second substrate opposite to the first substrate; and a plurality of spacers disposed between the first substrate and the second substrate. Herein, a first portion of the plurality of spacers are disposed in the first pixel region, a second portion of the plurality of spacers are disposed in the second pixel region, a disposition density of the second portion of the plurality of spacers in the second pixel region is different from a disposition density of the first portion of the plurality of spacers in the first pixel region. 
     The present disclosure provides another display device, comprising a first pixel region and a second pixel region adjacent to the first pixel region. The display device of the present disclosure comprises: a first substrate; a second substrate opposite to the first substrate; a plurality of spacers disposed between the first substrate and the second substrate, wherein a first portion of the plurality of spacers are disposed in the first pixel region, a second portion of the plurality of spacers are disposed in the second pixel region; a plurality of data lines extending along a first direction; and a plurality of scan lines extending along a second direction different from tine first direction, wherein the first pixel region comprises a plurality of first pixels, the second pixel region comprises a plurality of second pixels, and a length of one of the plurality of first pixels in at least one of the first direction and the second direction is less than a length of one of the plurality of second pixels in the at least one of the first direction and the second direction. 
     Other novel features of the disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1A  is a schematic top view of a display device according to one embodiment of the present disclosure. 
         FIG. 1B  is a schematic cross-sectional view of a display device according to one embodiment of the present disclosure. 
         FIG. 2  is a schematic top view of a first pixel region according to one embodiment of the present disclosure. 
         FIG. 3  is a schematic top view of a second pixel region according to one embodiment of the present disclosure. 
         FIG. 4  is a schematic top view of a second pixel region according to another embodiment of the present disclosure. 
         FIG. 5  is a schematic top view of a second pixel region according to another embodiment of the present disclosure. 
         FIG. 6  is a schematic top view of a second pixel region according to another embodiment of the present disclosure. 
         FIG. 7  is a schematic top view of a second pixel region according to further another embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION OF EMBODIMENT 
     Different embodiments of the present disclosure are provided in the following description. These embodiments are meant to explain the technical content of the present disclosure, but not meant to limit the scope of the present disclosure. A feature described in an embodiment may be applied to other embodiments by suitable modification, substitution, combination, or separation. 
     It should be noted that, in the present specification, when a component is described to have an element, it means that the component may have one or more of the elements, and it does not mean that the component has only one of the element, except otherwise specified. 
     Moreover, in the present specification, the ordinal numbers, such as “first” or “second”, are used to distinguish a plurality of elements having the same name, and it does not means that there is essentially a level, a rank, an executing order, or an manufacturing order among the elements, except otherwise specified. A “first” element and a “second” element may exist together in the same component, or alternatively, they may exist in different components, respectively. The existence of an element described by a greater ordinal number does not essentially means the existent of another element described by a smaller ordinal number. 
     In the present specification, except otherwise specified, the feature A “or” or “and/or” the feature B means the existence of the feature A, the existence of the feature B, or the existence of both the features A and B. The feature A “and” the feature B means the existence of both the features A and B. The term “comprise (s)” “comprising”, “include(s)”, “including”, “have”, “has” and “having” means “comprise(s)/comprising but is/are/being not limited to”. 
     Moreover, in the present specification, the terms, such as “top”, “upper”, “bottom” or “middle”, as well as the terms, such as “on”, “above”, “over”, “under”, “below”, or “between”, are used to describe the relative positions among a plurality of elements, and the described relative positions may be interpreted to include their translation, rotation, or reflection. 
     Furthermore, the terms recited in the specification and the claims such as “above”, “over”, or “on” are intended not only directly contact with the other element, but also intended indirectly contact with the other element. Similarly, the terms recited in the specification and the claims such as “below”, or “under” are intended not only directly contact with the other element but also intended indirectly contact with the other element. 
     In addition, the term “adjacent” in the specification and claims is used to describe mutual proximity, and does not necessarily mean mutual contact. 
     Moreover, in the present specification, a value may be interpreted to cover a range within ±20% of the value, and in particular, a range within ±10%, ±5%, ±3%, ±2%, ±1% or ±0.5% of the value, except otherwise specified. The value provided in the present specification is an approximate value, which means the meaning “about” is also included in the present disclosure without specifically specifying “about”. 
     In the present specification, except otherwise specified, the terms (including technical and scientific terms) used herein have the meanings generally known by a person skilled in the art. It should be noted that, except otherwise specified in the embodiments of the present disclosure, these terms (for example, the terms defined in the generally used dictionary) should have the meanings identical to those known in the art, the background of the present disclosure or the context of the present specification, and should not be read by an ideal or over-formal way. 
     In addition, the display device disclosed in the present disclosure may include a touch display device, a curved display device or a free shape display device, but is not limited to this. The display device can be a bendable or flexible display device. The display layer of the display device may include, for example, liquid crystal, light emitting diode, quantum dot (QD), fluorescence, phosphor or other suitable display media, or a combination thereof, but is not limited to this. In the present disclosure, the light emitting diode may include, for example, OLED, LED, mini LED, micro LED, QD light emitting diode (for example, QLED, QDLED) or other suitable materials, or any combination thereof, but is not limited to this. The display device may include, for example, a tiled display device, but is not limited to this. It should be noted that the display device can be any combination of the foregoing, but is not limited to this. In addition, the appearance of the display device may be rectangular, circular, polygonal, a shape with curved edges, or other suitable shapes. The display device may be provided with a driving system, a control system, a light source system, a shelf system or other peripheral systems to support a display device or a tiled display device. 
       FIG. 1A  is a schematic top view of a display device according to one embodiment of the present disclosure. As shown in  FIG. 1A , the display device of the present embodiment comprises: a display region AA; and a border region P at to the display region AA. In addition, the display device of the present embodiment further comprises: a first pixel region R 1  and a second pixel region R 2  adjacent to the first pixel region R 1 , wherein the first pixel region R 1  and the second pixel region R 2  are different regions of the display region AA. In the present: embodiment, the first pixel region R 1  and the second pixel region R 2  are the regions capable of displaying images. The difference between the first pixel region R 1  and the second pixel region R 2  is that, the first pixel region R 1  is the region for displaying images, and the second pixel region R 2  can not only display images but also corresponds to a camera pixel region or a face recognition pixel region. It should be noted that, although the second pixel region R 2  shown in  FIG. 1A  is rectangular, the second pixel region R 2  of the present disclosure can be modified to have other suitable shapes according to the actual needs. 
       FIG. 1B  is a schematic cross-sectional view of a display device according to one embodiment of the present disclosure. As shown in  FIG. 1B , the display device of the present embodiment comprises: a first substrate  11 ; a second substrate  12  opposite to the first substrate  11 ; and a plurality of spacers  14  disposed between the first substrate  11  and the second substrate  12  and contacting the first substrate  11  and/or the second substrate  12 . In addition, a portion of the plurality of spacers  14  are disposed in the first pixel region R 1 , and another portion of the plurality of spacers  14  are disposed in the second pixel region R 2 . Furthermore, the display device of the present: embodiment: further comprise: a display layer  13  disposed between the first substrate  11  and the second substrate  12 . 
     In the present embodiment, the first substrate  11  and the second substrate  12  may respectively include flexible substrates or non-flexible substrates, and the materials thereof include, for example, glass, quartz, wafer, sapphire, polycarbonate (PC), polyimide (PI), polypropylene (PP), polyethylene terephthalate (PET), other suitable materials or a combination of the aforementioned materials; but the present disclosure is not limited thereto. The materials of the first substrate  11  and the second substrate  12  may be the same or different, depending upon the designs. In addition, in the present embodiment, the display medium included in the display layer  13  may comprise, for example, liquid crystal molecules or the aforesaid light emitting diodes, quantum dots, fluorescence, phosphors or other suitable materials. Furthermore, the material of the spacers  14  may include, for example, resin; but the present disclosure is not limited to this. 
     As shown  FIG. 1B , the display device of the present embodiment may further comprise: a light shielding layer  15  disposed between the first substrate  11  and the second substrate  12  in the present embodiment, the light shielding layer  15  is disposed on a surface of the second substrate  12  facing the display layer  13 , but the present disclosure is not limited thereto. In another embodiment of the present disclosure, the light shielding layer  15  may be disposed on a surface of the first substrate  11  facing the display layer  13 . In addition, the display device of the present embodiment may further comprise: a color filter layer (not shown in the figure) disposed between the first substrate  11  and the second substrate  12 . In one embodiment of the present disclosure, the color filter layer may be disposed on a surface of the first substrate  11  facing the display layer  13 . In another embodiment of the present disclosure, the color filter layer may be disposed on a surface of the second substrate  12  facing the display layer  13 . Furthermore, the display device of the present embodiment may further comprise: at least one transistor (not shown in the figure), which may be disposed on the first substrate  11 . 
     As described above, the second pixel region R 2  can not only display images but also corresponds to a camera pixel region or a face recognition pixel region. In other words, the display device may further comprise a camera unit  16  or a face recognition unit  17  disposed corresponding to the second pixel region R 2 . in one embodiment of the present disclosure, the camera unit  16  or the face recognition unit  17  may be disposed under the first substrate  11 ; in this case, the display device may comprise a camera under display (CUD) device or a face recognizer under display (FRUD) device. 
     When the display device comprises the CUD device or the FRUD device, considering the camera imaging or face recognition performance, the resolution of the second pixel region R 2  has to be reduced. Thus, the display device of the present embodiment has the first pixel region R 1  with relatively high resolution for displaying and the second pixel region R 2  with relatively low resolution corresponding to the camera unit  16  or the face recognition unit  17 . 
       FIG. 2  is a schematic top view of a first pixel region according to one embodiment of the present disclosure.  FIG. 3  is a schematic top view of a second pixel region according to one embodiment of the present disclosure. In  FIG. 2  and  FIG. 3 , for the convenience of description and presentation, only the pixels, the light shielding layer and the spacers are shown. It should be noted that, in the present disclosure, the pixel is the area enclosed by two adjacent data lines (not shown in the figure) and two adjacent scan lines (not shown in the figure). Considering the widths of the data lines and the scan lines, the pixel area can be defined by edges of adjacent data lines and edges of adjacent scan lines. For example, when the data lines extend along the vertical direction (the Y direction shown in  FIG. 2 ) and the scan lines extend along the horizontal direction (the X direction shown in  FIG. 2 ), an area of one pixel can be defined by a left edge of a left data line to a left edge of a right data line and a bottom edge of a bottom scan line to a bottom edge of an upper scan line. An area of one pixel that allows light to pass through is the aperture region of the pixel, which can approximately correspond to the opening  152  of the light shielding layer  15 ; but the present disclosure is not limited thereto. 
     In the present embodiment, the distribution of the spacers in a partial region of the first pixel region R 1  may be used as a basic unit, which is repeatedly arranged in the X direction and/or the Y direction to obtain the distribution of the spacers in the second pixel region R 2 . For example, in the present embodiment,  FIG. 2  shows a part of the first pixel region R 1  shown in  FIG. 1A , and this part is a region having a length A and a width B, which is used as a basic unit. In the present embodiment, the size of the basic unit of the first pixel region R 1  is not limited to this and can be adjusted according to the needs.  FIG. 3  shows a part of the second pixel region R 2  shown in  FIG. 1A , which is a region having three times the length A and one time the width B. Herein, the basic unit with the length A and the width B shown in  FIG. 2  is repeated three time in the X direction to obtain the distribution of the spacers shown in  FIG. 3 , but the present disclosure is not limited thereto. 
     As shown in  FIG. 2  and  FIG. 3 , the first pixel region R 1  comprises a plurality of first pixels  111  (i.e. the area formed by the solid rectangle in  FIG. 2 , and the size of this area is the rectangular area with the dot-shaped filling pattern shown in  FIG. 2 ). The second pixel region R 2  comprises a plurality of second pixels  112  (i.e. the area formed by the solid rectangle in  FIG. 3 , and the size of this area is the rectangular area with the dot-shaped filling pattern shown in  FIG. 3 ). Herein, an area of one of the first pixels  111  is less than an area of one of the second pixels  112 . In the present embodiment, the area of the second pixel  112  is 9 times (3×3 times)) the area of the first pixel  111 . In another embodiment of the present disclosure, the area of the second pixel  112  may be M×N times the area of the first pixel  111 , wherein M and N may be integers greater than or equal to 1, and one of M and N is not equal to 1. In one embodiment of the present disclosure, M and N may be the same integer, and may be an integer in a range between 2 to 5. For example, the area of the second pixel  112  may be 4 time (2×2 time), 9 times (3×3 times), 16 times (4×4 times) or 25 times (5×5 times) the area of the first pixel  111 , but the present disclosure is not limited thereto. Thus, in the present embodiment, a pixel density of the second pixel region R 2  is less than a pixel density of the first pixel region R 1 . Herein, the term “pixel density” may refer to the number of pixels per unit area. In addition, as shown in  FIG. 2  and  FIG. 3 , the first pixels  111  and the second pixels  112  have rectangular shapes whose lengths in the horizontal direction X are greater than the lengths in the vertical direction Y, but the present disclosure is not limited thereto. In some embodiments, the lengths of the first pixels  111  and the second pixels  112  in the vertical direction Y may be greater than the lengths thereof in the horizontal direction X, or the first pixels  111  and the second pixels  112  may have non-rectangular shapes such as rhombus. in addition, as described above, the pixel is defined by the area enclosed by two adjacent data lines and two adjacent scan lines. Since the area of one of the first pixels  111  is less than the area of one of the second pixels  112 , it can be seen from the top view that the length of the first pixel  111  in the extension direction of at least one of the scan line and the data line is less than the length of the second pixel  112  in the same direction. 
     As shown in  FIG. 1B ,  FIG. 2  and  FIG. 3 , the display device of the present embodiment further comprises: a light shielding layer  15  (the part shown by dashed lines in  FIG. 2  and  FIG. 3 ), wherein the light shielding layer  15  comprises a light shielding region  151  and formed with a plurality of openings  152 , and the spacers  14  are disposed in the light shielding region  151  and are not disposed in the openings  152 . In addition, the spacers  14  comprises a plurality of main spacers  141  and a plurality of sub spacers  142 , and the main spacers  141  and the sub spacers  142  are disposed in the light shielding region  151 . As shown in  FIG. 1B , one difference between the main spacers  141  and the sub spacers  142  is the height difference in the Z direction (i.e. the normal direction of the first substrate  11 )). The height of the main spacers  141  is relatively high, which is mainly used to maintain the cell gap of the display layer  13  within a certain range. The height of the sub spacers  142  is relative low (smaller than the cell gap of the display layer  13 ), which is mainly used to improve the ability of the panel to withstand pressing. Although the main spacers  141  and the sub spacers  142  are shown in oval shapes in the schematic top views of  FIG. 2  and  FIG. 3 , the shapes of the main spacers  141  and the sub spacers  142  in the present disclosure are not limited thereto. For example, in some embodiments, the main spacers  141  and the sub spacers  142  may have circular or rectangular shapes in the top view. 
     As shown in  FIG. 3 , in the display device of the present embodiment, the second pixel region R 2  may correspond to a camera pixel region or a face recognition pixel region. Herein, a part of the light shielding region  151  is disposed in the second pixels  112 , and a part of the main spacers  141  and the sub spacers  142  can be disposed on the part of the light shielding region  151  in the second pixels  112 . In other words, in the first pixel region R 1  shown in  FIG. 2 , each of the first pixels  111  corresponds to one opening  152 . In the second pixel region R 2  shown in  FIG. 3 , each of the second pixels  112  corresponds to plural openings  152 , so a part of the light shielding region  151  can be disposed in the second pixels  112 . In addition, in the second pixel region R 2  shown in  FIG. 3 , since a part of the light shielding region  151  is disposed in the second pixels  112 , a part of the main spacers  141  and the sub spacers  142  can be disposed on the part of the light shielding region  151  in the second pixels  112 . In the present: embodiment, the pattern of the light shielding layer  15  in the second pixel region R 2  and/or the distribution of the main spacers  141  and the sub spacers  142  in the second pixel region R 2  is designed to be the same as those in the first pixel region R 1 , but the present disclosure is not limited to this. 
     When a part of the main spacers  141  and the sub spacers  142  are disposed on the light shielding region  151  in the second pixels  112 , the number or area of the main spacers  141  and the sub spacers  142  in the second pixels  112  can be increased, so the disposition density of the spacers can be increased. Thus, the ability of the second pixel region R 2  to withstand pressing can be similar to or the same as that of the first pixel region R 1 , or the problem of abnormal image display caused by the uneven cell gap of the display layer  13  can be improved. Herein, “the disposition density of the spacers” can be represented by the following equation (I): 
       The disposition density of the spacers=(a total area of the spacers in a region)/(a total area of the pixels corresponding to the region)   (I).
 
     It should be noted that, in the present disclosure, the total area of the main spacers in a region is equal to the area of one main spacer multiplied by the number of the main spacers in this region, and the total area of the sub spacers in the region is equal to the area of one sub spacer multiplied by the number of the sub spacers in this region. If the spacer cannot be calculated as a complete one spacer because it is located at the boundary of the region, the calculation should be based on the area ratio of the spacer in this region. In addition, if the number of the spacers per unit region is calculated, it can be called as the “number density”. in the embodiment shown in  FIG. 3 , the number density of the spacers in the second pixel region R 2  is the same as that in the first pixel region R 1 . However, in other embodiments (for example, the embodiments shown in  FIG. 4  to  FIG. 7 ), the number density of the spacers in the second pixel region R 2  is less than that in the first pixel region R 1 . 
     In the first pixel region R 1 , the materials of the light shielding region  151 , the main spacers  141  and the sub spacers  142  are materials with low visible light transmittance, such as carbon resin or black pigment; but the present disclosure is not limited thereto. In the present embodiment, the second pixel region R 2  is a face recognition pixel region, in which the recognition can be achieved through infrared transmittance. Thus, the materials of the light shielding region  151 , the main spacers  141  and the sub spacers  142  in the second pixels  112  of the second pixel region R 2  can be changed to the materials with higher infrared transmittance such as resin or black pigment with low carbon content or other color pigment mixing materials. Thus, even though the light shielding region  151 , the main spacers  141  and the sub spacers  142  in the second pixels  112  are disposed in the second pixels  112  of the second pixel region R 2 , the function of face recognition still can be achieved. Herein, the materials with “higher infrared transmittance” can be the materials that the transmittance of the infrared light having the wavelength ranged from 780 nm to 2500 nm can reach more than 70%, or even more than 95%. 
       FIG. 4  is a schematic top view of a second pixel region according to another embodiment of the present disclosure in the display device of the present embodiment, the second pixel region R 2  may correspond to a camera pixel region or a face recognition pixel region. In the present embodiment, the structure of the display device and the first pixel region can be similar to those shown in  FIG. 1A  to  FIG. 2 , and are not repeated again. One difference between the embodiments shown in  FIG. 4  and  FIG. 3  is that one second pixel  112  corresponds to plural openings  152  in FIG one second pixel  112  corresponds to one opening  152  in  FIG. 4 , and the area of one of the opening  152  in  FIG. 4  may be greater than the area of one of the openings  152  in  FIG. 3 . 
     As shown in  FIG. 4 , in the present embodiment, the distribution of the spacers in the region with the length A and the width B shown in  FIG. 2  can be used as a basic unit, and this basic unit is repeatedly arranged in the X direction and the Y direction several times. In addition, the area of the openings  152  in  FIG. 4  is lager, so the main spacers  141  and the sub spacers  142  corresponding to the openings  152  are removed when the basic unit is repeated arranged, and a part of the sub spacers  142  are replaced by the main spacers  141  to obtain the distribution of the spacers shown in  FIG. 4 . It should be noted that, in the present embodiment, a part of the main spacers  141  and the sub spacers  142  corresponding to the openings  152  are removed and a part of the sub spacers  142  are replaced by the main spacers  141 , so the quantity ratio of the main spacers  141  to the sub spacers  142  in the first pixel region R 1  (for example, the quantity ratio is 2:30 in  FIG. 2 ) may be different from the quantity ratio of the main spacers  141  to the sub spacers  142  in the second pixel region R 2  (for example, the quantity ratio is 9:87 in  FIG. 4 ). 
     In the present embodiment, the materials of the light shielding region  151 , the main spacers  141  and the sub spacers  142  in the first pixel region R 1  and the second pixel region R 2  are materials with low visible light transmittance. in order to avoid affecting the imaging of the camera unit or the face recognition function, the light shielding region  151  of the light shielding layer  15  may not be disposed in the middle area of the second pixels  112  (for examples, the middle area can be the region of the second pixels  112  which locates at the middle ⅓ of the length in the X direction and the middle ⅓ of the length in the Y direction), but is disposed on the edges of the second pixels  112 , and each of the second pixels  112  corresponds to one opening  152 . Meanwhile, the main spacers  141  and the sub spacers  142  are also not disposed in the middle area of the second pixels  112  corresponding to the opening  152 . 
     When the number of the main spacers  141  is too small, the support force of the spacers may be insufficient, affecting the cell gap of the display layer  13 . Thus, in the present embodiment, a part of the sub spacers  142  in the second pixel region R 2  are replaced by the main spacers  141  to maintain the cell gap of the display layer  13 . Although reducing the number of the sub spacers  142  may result in the insufficient ability of the second pixel region R 2  to withstand pressing, since the area of the second pixel region R 2  is not large and is usually located at the periphery of the display region which is not pressed frequently, even if the ability of the second pixel region R 2  to withstand pressing is insufficient, it will not affect the display device too much. It should be noted that, the distribution manner of the main spacers  141  and the sub spacers  142  shown in  FIG. 4  is merely an example, and the present disclosure is not limited to this. 
     As shown in  FIG. 2  and  FIG. 4 , in the present embodiment, the area of the second pixel  112  may be 9 times (3×3 times) the area of the first pixel  111 , but the present disclosure is not limited thereto. When the resolution of the second pixel region R 2  is reduced (taking the area of the second pixel  112  is 9 times the area of the first pixel  111  in the present embodiment as an example), the positions where the main spacers  141  and the sub spacers  142  can be disposed in the second pixel region R 2  may be one third of the positions in the first pixel region R 1  in the same area (for example, the area of the region having the length A and the width B shown in  FIG. 2 ). Thus, in the present embodiment, when the total number of the main spacers  141  and the sub spacers  142  is reduced and a part of the sub spacers  142  are replaced by the main spacers  141  in the second pixel region R 2 , the number of the main spacers  141  in the second pixel region R 2  may be greater than one third of the number of the main spacers  141  in the first pixel region R 1  and the number of the sub spacers  142  in the second pixel region R 2  may be less than one third of the number of the sub spacers  142  in the first pixel region R 1  in the same area (for example, the area of the region having the length A and the width B shown in  FIG. 2 ). 
     Thus, in the display device of the present embodiment, the quantity ratio of the main spacers  141  to the sub spacers  142  in the first pixel region R 1  is different: from the quantity ratio of the main spacers  141  to the sub spacers  142  in the second pixel region R 2 . In particular, in the present embodiment, the quantity ratio of the main spacers  141  to the sub spacers  142  in the first pixel region R 1  is less than the quantity ratio of the main spacers  141  to the sub spacers  142  in the second pixel region R 2 . For example, the quantity ratio of the main spacers  141  to the sub spacers  142  in the first pixel region R 1  may be ranged from 1:1 to 1:90 (1≤the number of the sub spacers/the number of the main spacers≤90), and the quantity ratio of the main spacers  141  to the sub spacers  142  in the second pixel region R 2  may be ranged from 1:1 to 1:60 (1≤the number of the sub spacers/the number of the main spacers≤60). 
     In addition, since the resolution of the second pixel region R 2  is relatively low and the position where the spacers can be disposed is reduced, the disposition density of the main spacers in the first pixel region R 1 : the disposition density of the main spacers in the second pixel region R 2  may range from 1:1 to 10:1 (1≤the disposition density of the main spacers in the first pixel region R 1 /the disposition density of the main spacers in the second pixel region R 2 ≤10) in the same area. Similarly, based on the same reason, the disposition density of the sub spacers in the first pixel region R 1 : the disposition density of the sub spacers in the second pixel region R 2  may range from 1:1 to 30:1 (1≤the disposition density of the sub spacers in the first pixel region R 1 /the disposition density of the sub spacers in the second pixel region R 2 ≤30). 
     Please refer to  FIG. 2  and  FIG. 5 .  FIG. 5  is a schematic top view of a second pixel region according to another embodiment of the present disclosure. In the display device of the present embodiment, the second pixel region R 2  may correspond to a camera pixel region or a face recognition pixel region. In the present embodiment, the structure of the display device and the first pixel region can be similar to those shown in  FIG. 1A  to  FIG. 2 , and are not repeated again. 
     Similar to the embodiment shown in  FIG. 4 , in the present embodiment shown in  FIG. 5 , the distribution of the spacers in the region with the length A and the width B shown in  FIG. 2  can be used as a basic unit, and this basic unit is repeatedly arranged in the X direction and the Y direction several times. In addition, the main spacers  141  and the sub spacers  142  originally corresponding to the openings  152  are removed to obtain the distribution of the spacers shown in  FIG. 5 . 
     One difference between the present embodiment and the embodiment shown in  FIG. 4  is that, in the present embodiment, a part of the sub spacers  142  are not replaced by the main spacers  141 , but the area of the main spacers  141  are increased to maintain the cell gap of the display layer  13 . Although the increasing of the area of the main spacers  141  may result in the aperture ratio of the second pixel region R 2  reduced, the openings  152  corresponding to the second pixels  112  shown in  FIG. 5  are greater than the openings  152  corresponding to the first pixels  111  shown in  FIG. 2 , and the impact on the image displaying is not large. 
     Thus, in the display device of the present embodiment, the area of the main spacers  141  in the first pixel region R 1  is less than the area of the main spacers  141  in the second pixel region R 2 . For example, the area of the main spacers  141  in the second pixel region R 2  can be increased by 100% to 500% (in other words, the area of the main spacers  141  in the second pixel region R 2  can be 2 to 6 times the area of the main spacers  141  in the first pixel region R 1 ). Herein, “the area of the spacer” refers to the area of the spacer projected onto the first substrate  11  (as shown in  FIG. 1B ) in a top view. 
     Please refer to  FIG. 2  and  FIG. 6 .  FIG. 6  is a schematic top view of a second pixel region according to another embodiment of the present disclosure. In the display device of the present embodiment, the second pixel region R 2  may correspond to a camera pixel region or a face recognition pixel region. In the present embodiment, the structure of the display device and the first pixel region can be similar to those shown in  FIG. 1A  to  FIG. 2 , and are not repeated again. 
     Similar to the embodiment shown in  FIG. 4 , in the present embodiment shown in  FIG. 6 , the distribution of the spacers in the region with the length A and the width B shown in  FIG. 2  can be used as a basic unit, and this basic unit is repeatedly arranged in the X direction and the Y direction several times. In addition, the main spacers  141  and the sub spacers  142  originally corresponding to the openings  152  are removed, and a part of the main spacers  141  are replaced by the sub spacers  142  to obtain the distribution of the spacers shown in  FIG. 6 . 
     One difference between the present embodiment and the embodiment shown in  FIG. 4  is that, in the present embodiment, a part of the sub spacers  142  are not replaced by the main spacers  141 , but a part of the main spacers  141  are replaced by the sub spacers  142 . Thus, on the premise of maintaining the cell gap of the display layer  13  by the spacers with the required minimum disposition density, even though the number of the main spacers  141  is reduced, the cell gap of the display layer  13  still can be maintained and the panel has sufficient ability to withstand pressing. 
     Similar to the embodiment shown in FIG. as shown in  FIG. 2  and  FIG. 6 , in the present embodiment, the area of the second pixel  112  is 9 times (3×3 times) the area of the first pixel  111 , but the present disclosure is not limited to this. When the resolution of the second pixel region R 2  is reduced (taking the area of the second pixel  112  is 9 times the area of the first pixel  111  in the present embodiment as an example), the positions where the main spacers  141  and the sub spacers  142  can be disposed in the second pixel region R 2  may be one third of the positions in the first pixel region R 1  in the same area (for example, the area of the region having the length A and the width B shown in  FIG. 2 ). Thus, in the present embodiment, when the total number of the main spacers  141  and the sub spacers  142  is reduced and a part of the main spacers  141  are replaced by the sub spacers  142  in the second pixel region R 2 , the number of the main spacers  141  in the second pixel region R 2  may be less than one third of the number of the main spacers  141  in the first pixel region R 1  and the number of the sub spacers  142  in the second pixel region R 2  may be greater than one third of the number of the sub spacers  142  in the first pixel region R 1  in the same area (for example, the area of the region having the length A and the width B shown in  FIG. 2 ). 
     Thus, in the display device of the present embodiment, the quantity ratio of the main spacers  141  to the sub spacers  142  in the first pixel region R 1  is different from the quantity ratio of the main spacers  141  to the sub spacers  142  in the second pixel region R 2 . in particular, in the present embodiment, the quantity ratio of the main spacers  141  to the sub spacers  142  in the first pixel region R 1  is greater than the quantity ratio of the main spacers  141  to the sub spacers  142  in the second pixel region R 2 . For example, the quantity ratio of the main spacers  141  to the sub spacers  142  in the first pixel region R 1  may be ranged from 1:1 to 1:60 (1≤the number of the sub spacers/the number of the main spacers≤60), and the quantity ratio of the main spacers  141  to the sub spacers  142  in the second pixel region R 2  may be ranged from 1:1 to 1:90 (1≤the number of the sub spacers/the number of the main spacers≤90). 
       FIG. 7  is a schematic top view of a second pixel region according to further another embodiment of the present disclosure. In the display device of the present embodiment, the second pixel region R 2  may correspond to a camera pixel region or a face recognition pixel region. In the present embodiment, the structure of the display device and the first pixel region can be similar to those shown in  FIG. 1A  to  FIG. 2 , and are not repeated again. 
     Similar to the embodiment shown in  FIG. 5 , in the present embodiment shown in  FIG. 7 , the distribution of the spacers in the region with the length A and the width B shown in  FIG. 2  can be used as a basic unit, and this basic unit is repeatedly arranged in the X direction and the Y direction several times. In addition, the main spacers  141  and the sub spacers  142  originally corresponding to the openings  152  are removed to obtain the distribution of the spacers show in  FIG. 7 . 
     One difference between the present embodiment and the embodiment shown in  FIG. 5  is that, in the present embodiment, the area of the main spacers  141  is not increased but the area of the sub spacers  142  is increased to maintain the ability of the panel to withstand pressing. Although the increasing of the area of the sub spacers  142  may result in the aperture ratio of the second pixel region R 2  reduced, the openings  152  corresponding to the second pixels  112  shown in  FIG. 5  are greater than the openings  152  corresponding to the first pixels  111  shown in  FIG. 2 , and the impact on the image displaying is not large. 
     Thus, in the display device of the present embodiment, the area of the sub spacers  142  in the first pixel region R 1  is less than the area of the sub spacers  142  in the second pixel region R 2 . For example, the area of the sub spacers  142  in the second pixel region R 2  can be increased by 100% to 500% (in other words, the area of the sub spacers  142  in the second pixel region R 2  can be 2 to 6 times the area of the sub spacers  142  in the first pixel region R 1 ). 
       FIG. 4  to  FIG. 7  show the modifications of some embodiments of the present disclosure, but the present disclosure is not limited thereto. More specifically, the area and the number of the main spacers and the sub spacers in the second pixel region may be selectively modified according to the design modes shown in the following Table 1. 
     
       
         
           
               
               
               
               
             
               
                   
                 TABLE 1 
               
             
            
               
                   
                   
               
               
                   
                 Design 
                 Main spacers 
                 Sub spacers 
               
            
           
           
               
               
               
               
               
               
            
               
                   
                 mode 
                 Number 
                 Area 
                 Number 
                 Area 
               
               
                   
                   
               
               
                   
                 A. 
                 Increase 
                 Unchanged 
                 Decrease 
                 Unchanged 
               
               
                   
                 B. 
                 Increase 
                 Increase or 
                 Decrease 
                 Unchanged 
               
               
                   
                   
                   
                 Decrease 
                   
                   
               
               
                   
                 C. 
                 Increase 
                 Unchanged 
                 Decrease 
                 Increase 
               
               
                   
                 D. 
                 Increase 
                 Increase or 
                 Decrease 
                 Increase 
               
               
                   
                   
                   
                 Decrease 
                   
                   
               
               
                   
                 E. 
                 Decrease 
                 Unchanged 
                 Increase 
                 Unchanged 
               
               
                   
                 F. 
                 Decrease 
                 Increase 
                 Increase 
                 Unchanged 
               
               
                   
                 G. 
                 Decrease 
                 Unchanged 
                 increase 
                 Increase or 
               
               
                   
                   
                   
                   
                   
                 Decrease 
               
               
                   
                 H. 
                 Decrease 
                 Increase 
                 Increase 
                 Increase or 
               
               
                   
                   
                   
                   
                   
                 Decrease 
               
               
                   
                 I. 
                 Unchanged 
                 Increase 
                 Unchanged 
                 Increase 
               
               
                   
                 J. 
                 Unchanged 
                 Increase 
                 Unchanged 
                 Unchanged 
               
               
                   
                 K. 
                 Unchanged 
                 Unchanged 
                 Unchanged 
                 Increase 
               
               
                   
                   
               
            
           
         
       
     
     In Table 1, the “increase or decrease in number” refers to that the distribution of the spacers in a partial region of the first pixel region is used as a basic unit, this basic unit is repeated arranged in the second pixel region, the main spacers and the sub spacers corresponding to the openings in the second pixel region are removed to obtain the first distribution, a part of the main spacers (the sub spacers) are replaced by the sub spacers (the main spacers) and/or the areas of the main spacers and/or the sub spacers are adjusted to obtain the second distribution, and the increase or decrease in the numbers of the main spacers and the sub spacers can be obtained when the second distribution is compared with the first distribution. In addition, the “increase or decrease in area” refers to that the areas of the main spacers or the sub spacers in the second pixel region are increased or decreased, compared with the areas of the main spacers or the sub spacers in the first pixel region. For example, in the embodiment shown in  FIG. 4 , the basic unit is repeated arranged and a part of the main spacers and sub spacers corresponding to the openings in the second pixel region are removed to obtain the first distribution, and a part of the sub spacers in the second pixel region are replaced by the main spacers to obtain the second distribution. Since a part of the sub spacers in the second pixel region are replaced by the main spacers, compared with the first distribution, the number of the main spacers is increased and the number of the sub spacers is decreased in the second distribution, and the areas of the main spacers and the sub spacers are unchanged. Thus, the embodiment shown in  FIG. 4  satisfies the design mode A of Table 1. 
     In the design modes C, D, F and H, the number of the main spacers or the sub spacers is decreased, so the areas of the main spacers or the sub spacers are not decreased. In the design modes I, J and K, when the numbers of the main spacers and the sub spacers are unchanged, since the number of the spacers in the second pixel region is less than the number of the spacers in the first pixel region, the areas of the main spacers and/or the sub spacers are increased to satisfy the aforesaid requirement. 
     It should be noted that, in the above embodiments, both the main spacers and the sub spacers are disposed in the second pixel region. However, in some embodiments, the main spacers or the sub spacers may not present in the second pixel region. When the main spacers are not present in the second pixel region, the amount of the liquid crystal molecules may be increased or the disposition density of the main spacers in the first pixel region near to the second pixel region may be increased, to compensate the cell gap of the liquid crystal layer. Similarly, when the sub spacers are not present in the second pixel region, the amount of the liquid crystal molecules may be increased or the disposition density of the sub spacers in the first pixel region near to the second pixel region may be increased, to compensate the ability of the second pixel region to withstand pressing. 
     In the present disclosure, the features in different embodiments of the present disclosure can be mixed to form another embodiment without departing from the spirit and scope of the disclosure as hereinafter claimed. 
     Although the present disclosure has been explained in relation to its embodiment, it is to be understood that many other possible modifications and variations can be made without departing from the spirit and scope of the disclosure as hereinafter claimed. 
     In addition, the aforesaid embodiments are examples for convenience of description, and the claimed scope of the present disclosure should be subjected to the claims, rather than being limited to the aforesaid embodiments.