spliced display device

Abstract

The present disclosure discloses a spliced display device, comprising a first panel and a second panel, and a first protective layer and a second protective layer, wherein the first protective layer is disposed on the first panel, the second protective layer is disposed on the second panel, the first protective layer and the second protective layer have a contact area, and the length of the first protective layer is greater than the length of the second protective layer and covers a portion of the second panel.

Description

[0001] This application is a divisional application of the invention patent application with the application date of November 4, 2020, application number 202011217617.0, and invention name “Splicing Display Device”. Technical Field

[0002] The present disclosure relates to a display device, and more particularly to a spliced display device. Background Art

[0003] Flat panel display devices have the characteristics of being light and thin, and have gradually become mainstream products in the display device market. Among them, foldable flat panel display devices can simultaneously meet the requirements of being easy to carry and providing a larger display area.

[0004] The peripheral area of the spliced display device in the prior art may cause users to observe dark areas, image distortion or color difference above the spliced junction, affecting the visual quality. Summary of the Invention

[0005] The present disclosure provides a spliced display device, which can reduce the problem of poor display at the joint between two spliced panels observed by users, thereby achieving the purpose of improving display quality.

[0006] The present disclosure discloses a spliced display device, comprising a first panel and a second panel, and a first protective layer and a second protective layer, wherein the first protective layer is disposed on the first panel, the second protective layer is disposed on the second panel, the first protective layer and the second protective layer have a contact area, and the length of the first protective layer is greater than the length of the second protective layer and covers a portion of the second panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] For ease of understanding, the same reference numerals are used, where possible, to indicate the same elements shared by the figures. It is anticipated that elements disclosed in one embodiment may be utilized in other embodiments without specific description. Unless otherwise specified, the drawings herein should not be understood as being drawn to scale, and for the sake of clarity of expression and explanation, the drawings are often simplified and details or elements are omitted. The drawings and detailed description herein are used to explain the principles discussed below, and like reference numerals are used to indicate the same elements.

[0008] Figure 1 FIG. 1 is a schematic top view of a spliced display device when unfolded according to an embodiment of the present disclosure.

[0009] Figure 2 FIG. 1 is a cross-sectional view of a spliced display device in an unfolded state according to an embodiment of the present disclosure.

[0010] Figure 3 for Figure 2The illustrated embodiment is a schematic diagram of the area near the splicing line of the spliced display device in the unfolded state.

[0011] Figure 4 FIG. 4 is a cross-sectional view of a spliced display device in an unfolded state according to another embodiment of the present disclosure.

[0012] Figure 5 for Figure 4 The illustrated embodiment is a schematic diagram of the area near the splicing line of the spliced display device in the unfolded state.

[0013] Figure 6 for Figure 4 The diagram shows a cross-sectional view of the spliced display device in a partially folded state.

[0014] Figure 7 FIG. 4 is a cross-sectional view of a spliced display device in an unfolded state according to yet another embodiment of the present disclosure.

[0015] Figure 8 for Figure 7 The diagram shows a cross-sectional view of the spliced display device in a partially folded state.

[0016] Figure 9 FIG. 4 is a cross-sectional view of a spliced display device in an unfolded state according to yet another embodiment of the present disclosure.

[0017] Figure 10 FIG. 4 is a cross-sectional view of a spliced display device in an unfolded state according to another embodiment of the present disclosure.

[0018] Explanation of reference numerals: 10, 10a, 10c, 10d ~ splicing display device; 102 ~ first supporting layer; 104 ~ second supporting layer; 11- ~ peripheral circuit element; 111-1 ~ recess; 12 ~ first panel; 121, 141 ~ light emitting area; 121-1, 141-1 ~ main light emitting area; 121-2, 141-2 ~ auxiliary light emitting area; 14 ~ second panel; 16, 18 ~ protective layer; 16a, 18a ~ flat area; 18b, 16b, 16c, 18c ~ curved area; 22 ~ first axis device; 24 ~ second axis device; 26 ~ shared axis device; AA ~ expanded screen display area; AA1 ~ first display area; AA2 ~ second display area; AA3 ~ third display area; AA4 ~ fourth display area; AX, AX1, AX2, AX3 ~ splicing line; B1, B2, D 1. D2, B1', B2', W1, W2 ~ width; BS1, BS2 ~ bottom surface; CR ~ contact area; H ~ height; HSP ~ horizontal plane; P1, P1' ~ starting point of the curved surface; P2, P2' ~ end point of the curved surface; PR1, PR2, PR1-1, PR1-2, PR2-1, PR2-2 ~ peripheral area; R1 ~ Rn, G1 ~ Gn, B1 ~ Bn ~ pixels; RX1 ~ first bend Axis; RX2 ~ second bending axis; RX3 ~ rotation axis; T1, T2 ~ thickness; TS1, TS2 ~ display surface, top surface; X1, X2, L1, L2, L1', L2' ~ distance; Z, X, Y ~ direction; D3 ~ length; D4 ~ length; I ~ midpoint; J ~ intersection point; K ~ intersection point; 111-2 ~ gap; CV ~ conic section; TL1 ~ tangent; TL2 ~ tangent; CL ~ section line. DETAILED DESCRIPTION

[0019] The present disclosure will be understood by referring to the following detailed description in conjunction with the accompanying drawings. It should be noted that, for ease of understanding and for simplicity, many of the figures in this disclosure depict only a portion of the display device, and certain components in the figures are not drawn to scale. Furthermore, the number and dimensions of components in the figures are for illustration only and are not intended to limit the scope of this disclosure.

[0020] Throughout this disclosure and the claims, certain terms are used to refer to specific components. Those skilled in the art will appreciate that electronic device manufacturers may refer to the same components by different names. This document does not intend to distinguish between components that have the same function but different names. In the following description and claims, words such as "including," "comprising," and "having" are open-ended and should be interpreted as meaning "including, but not limited to..."

[0021] It should be understood that when an element or film layer is referred to as being "on" or "connected to" another element or film layer, it can be directly on or directly connected to the other element or film layer, or other elements or films may be present between the two elements or films. Conversely, when an element is referred to as being "directly on" or "directly connected to" another element or film layer, there are no intervening elements or films.

[0022] While terms such as "first," "second," and "third" may be used to describe or name various components, these components are not limited to these terms. These terms are used solely to distinguish one component from other components in the specification and have no bearing on the order in which these components are manufactured. Claims may not use the same terms and may be replaced with "first," "second," "third," etc., depending on the order in which the elements are declared in the claims. Accordingly, in the following description, a first component may be referred to as a second component in a claim.

[0023] It should be noted that the following embodiments may be implemented by replacing, reorganizing, or mixing features of several different embodiments without departing from the spirit of the present disclosure to implement other embodiments.

[0024] The video wall device disclosed herein may be a curved display or a bendable display, wherein a bendable display refers to a display that can be bent, folded, stretched, flexed, or otherwise deformed (hereinafter referred to as "flexible"). In other words, during operation, the display may have a curved surface or bend.

[0025] Embodiments of the spliced display device disclosed herein may include, but are not limited to, non-luminous liquid crystal displays (LCDs), luminous organic light emitting diode displays (OLEDs), inorganic light emitting diode displays (LEDs), sub-millimeter inorganic light emitting diode displays (Mini-LEDs), micro-LEDs, quantum dot LEDs (QLEDs), or electrophoretic displays (EPDs), among other types of displays capable of presenting images and pictures.

[0026] Please refer to Figure 1 . Figure 1 FIG2 is a schematic top view of a tiled display device 10 according to an embodiment of the present disclosure, viewed from the top down (direction Z) when unfolded. The tiled display device 10 can be applied to various deformable electronic devices, such as, but not limited to, mobile phones, mobile personal computers, antennas, lighting, e-books, and electronic paper. It should be understood that the tiled display device 10 disclosed herein, comprising two panels, is merely an example; in practice, a tiled display device can be constructed using a combination of multiple panels.

[0027] Figure 1 The splicing display device 10 shown includes at least a first panel 12 and a second panel 14 spliced along a splicing line AX on one side of the first panel 12. In other words, the first panel 12 and the second panel 14 are respectively located on both sides of the splicing line AX along the direction X (also referred to as the splicing direction). The splicing line AX can extend along a direction, for example, along the direction Y. The first panel 12 includes an upper surface TS1 (display surface) and a lower surface BS1 relative to the upper surface TS1, the upper surface TS1 including a first display area AA1 and a second display area AA2, wherein the second display area AA2 is located between the first display area AA1 and the splicing line AX. The second panel 14 includes an upper surface TS2 (display surface) and a lower surface BS2 relative to the upper surface TS2, the upper surface TS2 including a third display area AA3 and a fourth display area AA4, wherein the fourth display area AA4 is located between the third display area AA3 and the splicing line AX. The first display area AA1, the second display area AA2, the third display area AA3 and the fourth display area AA4 can together constitute an expanded screen display area AA of the spliced display device 10 when the first panel 12 and the second panel 14 are unfolded to be approximately in the same horizontal plane (the plane formed by the direction X and the direction Y). The expanded screen display area AA can display a continuous picture as a whole, or can display different pictures separately as needed, which is not limited to this and depends on the design requirements. For example, the first display area AA1 and the second display area AA2 of the first panel 12 can serve as a main display area, and the third display area AA3 and the fourth display area AA4 of the second panel 14 can serve as an auxiliary display area to facilitate simultaneous reference of the two pictures, but is not limited to this. In some embodiments, the spliced display device disclosed herein can be composed of two or more display panels spliced together, and each display area can be non-rectangular. For example, the expanded screen display area after splicing can be circular, and the display area of each display panel can be, for example, semicircular.

[0028] In some embodiments, the first panel 12 may optionally include a peripheral region PR1 disposed outside at least one of the first display area AA1 and the second display area AA2, and the second panel 14 may optionally include a peripheral region PR2 disposed outside at least one of the third display area AA3 and the fourth display area AA4. Figure 1 The middle display peripheral area PR1 is located on the upper side, lower side, and left outer side of the first display area AA1. However, the peripheral area PR1 of the first panel 12 can also be located on the side of the second display area AA2 opposite to the first display area AA1, or between the second display area AA2 and the fourth display area AA4. However, when the spliced display device 10 is unfolded, it is difficult to observe this part of the peripheral area PR1 from the user's side. For example, this part of the peripheral area PR1 will bend to the lower side or below the display area, or overlap with part of the second display area AA2. Similarly, although Figure 1 The central display peripheral region PR2 is located above, below, and to the right of the third display area AA3. However, the peripheral region PR2 of the second panel 14 may also be located on the side of the fourth display area AA4 opposite the third display area AA3, or between the fourth display area AA4 and the second display area AA2. However, when the tiled display device 10 is unfolded, this portion of the peripheral region PR2 is less visible from the user's side. For example, this portion of the peripheral region PR2 may bend below or below the display area, or overlap with a portion of the fourth display area AA4. Peripheral circuit elements 11 may be optionally disposed within the peripheral region PR1 and / or the peripheral region PR2. Peripheral circuit elements 11 may include, but are not limited to, driver elements, reset elements, compensation elements, initialization elements, operation control elements, light control elements, capacitors, inductors, power supply circuits, or combinations thereof, for controlling the operation of the display units of the first panel 12 and / or the second panel 14. In some embodiments, the peripheral region PR1 and / or the peripheral region PR2 may be connected to at least one flexible printed circuit (FPC) (not shown). By placing peripheral circuit elements on a flexible printed circuit board and bending the flexible printed circuit board toward the lower surface BS1 and / or lower surface BS2 of the first panel 12 and / or the second panel 14, the area of the peripheral region PR1 and / or the peripheral region PR2 occupied by the peripheral circuit elements can be reduced, thereby reducing the overall area of the peripheral region PR1 and / or the peripheral region PR2.

[0029] The design disclosed in the following details can reduce the influence of the dark area near the splicing line AX. In other words, the splicing display device 10 disclosed in the present invention is in the normal viewing direction (such as Figure 1When used in the direction Z shown, a dark area is less likely to be observed between the second display area AA2 of the first panel 12 and the fourth display area AA4 of the second panel 14, resulting in improved display quality. In some embodiments of the present disclosure, when the spliced display device 10 is used in the normal viewing direction, the peripheral area PR1 and / or peripheral area PR2 disposed outside the first display area AA1 and / or the third display area AA3 are less likely to be observed, achieving a display effect approaching a "full screen" or "borderless" display. Compared to the peripheral areas of spliced display devices in the prior art, which can cause users to observe dark areas, image distortion, or color differences in the display area near the splicing line AX, the present disclosure can reduce the problems of dark areas or color differences.

[0030] Please refer to Figure 2 . Figure 2 : This is a cross-sectional schematic diagram of a splicing display device 10a in an unfolded state according to an embodiment of the present disclosure. The splicing display device 10a includes a first panel 12 and a second panel 14 located on both sides of a splicing line AX1 along a direction X (splicing direction), and a protective layer 16 and a protective layer 18 are respectively arranged on the first panel 12 and the second panel 14, that is, the protective layer 16 is arranged corresponding to the first panel 12, and the protective layer 18 is arranged corresponding to the second panel 14. The first panel 12 includes a light emitting area 121 and a peripheral area PR1-1 and a peripheral area PR1-2 arranged on both sides of the light emitting area 121. The second panel 14 includes a light emitting area 141 and a peripheral area PR2-1 and a peripheral area PR2-2 arranged on both sides of the light emitting area 141. The peripheral area PR1-1 of the first panel 12 and the peripheral area PR2-1 of the second panel 14 are adjacently arranged on both sides of the splicing line AX1. Figure 2 The top of the panel 12 is the top view direction, that is, the upper surface TS1 of the first panel 12 and the upper surface TS2 of the second panel 14 face upward, and the lower surfaces BS1 and BS2 face downward. Figure 2 The horizontal plane HSP shown represents the plane formed by the direction X and the direction Y. Figure 1 ) in the position of the splicing line AX as shown in Figure 2 As shown, the line of the highest point in the cross-sectional view is generally used as a reference. In this embodiment, the splicing line AX and the splicing line AX1 are substantially overlapped.

[0031] The first panel 12 and the second panel 14 may each include a multi-layer structure. For example, from the lower surface BS1 (BS2) to the upper surface TS1 (TS2), they may include, but are not limited to, a support layer, a flexible substrate, a display element layer, an encapsulation layer, etc. In order to simplify the diagram, the multi-layer structure of the first panel 12 and the second panel 14 is not shown in the figure. The material of the support layer may include copper, iron, aluminum, etc., or alloys of these elements, but is not limited thereto. The flexible substrate material may include any suitable flexible or bendable material, such as polyimide, polyethylene naphthalate (PEN), polyethylene terephthalate (PET) and other polymer materials or combinations thereof, but is not limited thereto. The flexible substrate can be attached to the support layer by an adhesive layer to maintain the structure and / or shape of the flexible substrate. The display element layer is arranged on the flexible substrate and may include a dielectric stack, a display unit and a driving element. The dielectric stack may include organic materials, inorganic materials or a combination thereof, but the present disclosure is not limited thereto. The display unit may be any type of display unit or element. In some embodiments, the display unit may include a light-emitting diode (LED), and the light-emitting diode may be, for example, an organic light-emitting diode (OLED), a micro-LED, a sub-millimeter light-emitting diode (mini LED), a quantum dot light-emitting diode (QLED) or a combination thereof, but is not limited thereto. Each display unit can be roughly regarded as a sub-pixel. A driving element is provided corresponding to each display unit to control the light output of each display unit. The driving element may be, for example, a top-gate type TFT or a bottom-gate type TFT, but is not limited thereto. The light-emitting area 121 of the first panel 12 and the light-emitting area 141 of the second panel 14 are roughly equivalent to the range of the display element layer. The encapsulation layer is disposed on the display element layer, and may be, for example, a thin film encapsulation layer (TFE) formed by stacking organic, inorganic, and organic layers. The encapsulation layer can prevent moisture or oxygen from the environment from affecting the display element layer, thereby improving display quality. In some embodiments, if the first panel 12 and / or the second panel 14 are sensor-based display panels, they may also include a biometric identification layer and / or a touch layer. The touch layer may have full touch functionality itself, or may have an assistive touch function.The touch layer can be directly set on the packaging layer, or it can be first set on another flexible substrate and then bonded to the packaging layer. In other embodiments, the touch layer can also be integrated into the display element layer according to design requirements. The biometric identification layer can itself have a complete biometric identification function, or it can have an auxiliary touch function. The biometric identification layer can be directly set on the packaging layer, or it can be first set on another flexible substrate and then bonded to the packaging layer. In other embodiments, the biometric identification layer can also be integrated into the display element layer according to design requirements. The biometric identification layer can be, for example, a fingerprint identification layer, or other suitable identification layer.

[0032] like Figure 2 As shown, the portion of the first panel 12 near the splicing line AX1 is bent toward the lower surface BS1 around a first bending axis RX1, and the portion of the second panel 14 near the splicing line AX1 is bent toward the lower surface BS2 around a second bending axis RX2. The first bending axis RX1 and the second bending axis RX2 extend along the same direction Y as the splicing line AX1. The light emitting area 121 of the first panel 12 may include a main light emitting area 121-1 and an auxiliary light emitting area 121-2, wherein the auxiliary light emitting area 121-2 extends into the bent portion. The light emitting area 141 of the second panel 14 may include a main light emitting area 141-1 and an auxiliary light emitting area 141-2, wherein the auxiliary light emitting area 141-2 of the light emitting area 141 extends into the bent portion. When the spliced display device 10a is in the unfolded state, the first display area AA1 roughly corresponds to the main light emitting area 121-1 of the first panel 12, the second display area AA2 roughly corresponds to the auxiliary light emitting area 121-2 of the first panel 12, the third display area AA3 roughly corresponds to the main light emitting area 141-1 of the second panel 14, and the fourth display area AA4 roughly corresponds to the auxiliary light emitting area 141-2 of the second panel 14.

[0033] The first panel 12 and the second panel 14 may be joined together in any suitable manner. Figure 2 As shown, a first axis device 22 can be provided at the lower surface BS1 of the first panel 12, and a second axis device 24 can be provided at the lower surface BS2 of the second panel 14. Then, the first axis device 22 and the second axis device 24 can be connected together by a connecting member (not shown) to splice the first panel 12 and the second panel 14, and the first panel 12 and the second panel 14 can be relatively unfolded or folded. It should be understood that the above splicing method is only an example and is not intended to limit the present disclosure. In some embodiments, the position where the first axis device 22 is provided can roughly overlap with the first bending axis RX1, and the position where the second axis device 24 is provided can roughly overlap with the second bending axis RX2, but is not limited thereto.

[0034] Protective layers 16 and 18 may provide protection for first panel 12 and second panel 14 and / or provide optical compensation for the display area. Protective layers 16 and 18 may be made of inorganic materials, organic materials, or a combination thereof. Inorganic materials may include, for example, glass, and organic materials may include, but are not limited to, polymer materials such as polyimide, polyethylene naphthalate (PEN), and polyethylene terephthalate (PET), or a combination thereof.

[0035] The protective layer 16 may include a planar region 16a corresponding to the primary light emitting area 121-1 of the first panel 12, and a curved region 16b corresponding to the auxiliary light emitting area 121-2 and extending from the curved surface starting point P1 to the curved surface end point P2. The protective layer 18 may include a planar region 18a corresponding to the primary light emitting area 141-1 of the second panel 14, and a curved region 18b corresponding to the auxiliary light emitting area 141-2 and extending from the curved surface starting point P1 to the curved surface end point P2. The curved surface starting point P1 is the boundary between the planar region and the curved surface region, and the curved surface end point P2 is the outer edge of the curved surface region. The curved surface starting point P1 to the curved surface end point P2 of the curved surface region 16b and the curved surface region 18b can be connected by any curve, such as, but not limited to, an arc with a fixed curvature radius or an arc with a gradually changing curvature radius.

[0036] When the video splicing device 10a is unfolded, that is, when the primary light emitting area 121-1 and the primary light emitting area 141-1 are substantially located on the horizontal plane HSP (i.e., the primary light emitting area 121-1 and the primary light emitting area 141-1 are aligned with the horizontal plane HSP), the curved end points P2 of the curved area 16b and the curved end points P2 of the curved area 18b contact each other, forming a recess 111-1. This creates a contact region CR between the protective layer 16 and the protective layer 18. The top of the contact region CR substantially overlaps with the position of the curved end point P2, and the bottom of the contact region CR is at the same level as the lowest point of the auxiliary light emitting area 121-2 and / or the auxiliary light emitting area 141-2. The position and area of the contact region CR will vary depending on the structure of the video splicing device 10a or the different modes of unfolding and folding, but the contact region CR will generally be located on an extension of the splicing line AX1. The contact region CR can be a line or a contact surface, but is not limited thereto. The top of the contact region CR may be lower than the upper surface TS1 of the first panel 12 and / or the upper surface TS2 of the second panel 14 .

[0037] like Figure 2As shown, the projection of the upper surface TS1 of the first panel 12 to the lowest point of the auxiliary light emitting area 121-2 (or to the bottom of the contact area CR) in the direction Z has a distance X1, the projection of the upper surface TS2 of the second panel 14 to the lowest point of the auxiliary light emitting area 141-2 in the direction Z has a distance X2, the projection of the top of the contact area CR (i.e., the end point P2 of the curve) to the lowest point of the auxiliary light emitting area 121-2 and / or the auxiliary light emitting area 141-2 (or to the bottom of the contact area CR) in the direction Z has a height H, the planar area 16a of the protective layer 16 has a thickness T1, and the planar area 18a of the protective layer 18 has a thickness T2. When the following formula 1 is satisfied, the dark areas caused by the peripheral areas PR1-1 and PR2-1 can be reduced, thereby reducing the impact of the dark area between the second display area AA2 of the first panel 12 and the fourth display area AA4 of the second panel 14 on the user's observation, thereby forming an expanded screen display area AA together with the first display area AA1 and the third display area AA3.

[0038] 0≦H / (Xn+Tn)<0.8 (Formula 1)

[0039] In Formula 1, distance Xn and thickness Tn represent either a set of distance X1 and thickness T1 between the first panel 12 and the corresponding protective layer 16, or a set of distance X2 and thickness T2 between the second panel 14 and the corresponding protective layer 18. Distance Xn can be adjusted according to product requirements. In some embodiments, distance Xn can be greater than or equal to 0 and less than or equal to 200 μm. Formula 1 represents that the ratio of height H to the sum of thickness Tn and distance Xn is greater than or equal to 0 and less than 0.8. In some embodiments, distance X1 can be optionally equal to distance X2, and thickness T1 can be optionally equal to thickness T2, but the present invention is not limited thereto.

[0040] Please continue to refer to Figure 2 The projection of the curved surface starting point P1 and ending point P2 of the curved surface area 16b of the first panel 12 on the horizontal plane HSP has a distance L1. The projection of the curved surface starting point P1 and ending point P2 of the curved surface area 18b of the second panel 14 on the horizontal plane HSP has a distance L2. The projection of the contact area CR on the horizontal plane HSP to the auxiliary light emitting area 121-2 has a width W1. The projection of the contact area CR on the horizontal plane HSP to the auxiliary light emitting area 141-2 has a width W2. The projection of the first panel 12 on the horizontal plane HSP has a width D1. The projection of the second panel 14 on the horizontal plane HSP has a width D2. When the following equation 2 is satisfied, the dark areas caused by the peripheral areas PR1-1 and PR2-1 can be reduced, thereby reducing the impact of the dark area between the second display area AA2 of the first panel 12 and the fourth display area AA4 of the second panel 14 on the user's observation. Together with the first display area AA1 and the third display area AA3, an expanded display area AA is formed.

[0041] Dn / 2≧Ln≧Wn (Formula 2)

[0042] In Formula 2, the width Dn, the distance Ln, and the width Wn represent any one of the width D1, the distance L1, and the width W1 of the first panel 12 and the corresponding protective layer 16, and the width D2, the distance L2, and the width W2 of the second panel 14 and the corresponding protective layer 18. Formula 2 indicates that the distance Ln is less than or equal to half of the distance Dn and greater than or equal to the width Wn. In some embodiments, the distance L1 may be selectively equal to the distance L2, the width D1 may be selectively equal to the width D2, and the width W1 may be selectively equal to the width W2. In other embodiments, the distance L1 may be selectively not equal to the distance L2, the width D1 may be selectively not equal to the width D2, and the width W1 may be selectively not equal to the width W2, but the present invention is not limited thereto. As long as at least one of the above Formulas 1 or 2 is satisfied, the display quality can be improved and the sense of discontinuity of the dark areas observed by the user at the splicing point can be reduced.

[0043] Please continue to refer to Figure 2 . In some embodiments, the portion of the protective layer 16 corresponding to the peripheral area PR1-2 of the first panel 12 and the portion of the protective layer 18 corresponding to the peripheral area PR2-2 of the second panel 14 may include a curved area 16c and a curved area 18c, respectively, to provide optical compensation for the peripheral area PR1-2 and the peripheral area PR2-2. The curved area 16c extends from the starting point P1' of the curve to the end point P2' of the curve, and the projection on the horizontal plane HSP has a distance L1'. The curved area 18c extends from the starting point P1' of the curve to the end point P2' of the curve, and the projection on the horizontal plane HSP has a distance L2'. The projection of the peripheral area PR1-2 on the horizontal plane HSP has a width B1', and the projection of the peripheral area PR2-2 on the horizontal plane HSP has a width B2'. The following formula 3 can be selected to reduce the dark areas caused by the peripheral areas PR1-2 and PR2-2, so that the expanded display area AA can extend close to the outer edges of the first panel 12 and the second panel 18, achieving a display effect close to "full screen" or "borderless".

[0044] Dn / 2≧Ln'≧Bn'(Formula 3)

[0045] In Formula 3, width Dn, width Bn', and distance Ln' represent any one of the following: width D1, width B1', and distance L1' between the first panel 12 and the corresponding protective layer 16; and width D2, width B2', and distance L2' between the second panel 14 and the corresponding protective layer 18. Formula 3 indicates that distance Ln' is less than or equal to half of distance Dn and greater than or equal to width Bn'. In some embodiments, width B1' may be equal to width B2'. In other embodiments, width B1' may be different from width B2', but is not limited thereto.

[0046] Please refer to Figure 3 . Figure 3 The upper part is Figure 2 The illustrated embodiment is a partial side view of the splicing display device 10a in the unfolded state near the splicing line AX1, illustrating that light from the first panel 12 and the second panel 14 is emitted from the display element layer (not shown) and passes through the protective layers 16 and 18 to display an image. Figure 3 The lower portion is a first panel 12 and a second panel 14 corresponding to Figure 3 A partial top view of the pixel array of the main light emitting area and the auxiliary light emitting area at the top. Figure 3 Please refer to the upper direction axis for the upper direction. Figure 3 Please refer to the lower direction axis for the orientation of the lower part.

[0047] The present disclosure can also reduce the rainbow pattern phenomenon and / or display image distortion in the second display area AA2 and the fourth display area AA4 caused by the bending of the first panel 12 and the second panel 14 by pixel design, thereby reducing the discontinuity or splicing seam between the second display area AA2 and the fourth display area AA4. Figure 3At the bottom, according to some embodiments of the present disclosure, the first panel 12 and the second panel 14 are, for example, color display panels that can display multiple colors, and their display element layer includes a pixel array composed of a plurality of pixels R1~Rn, pixels G1~Gn and pixels B1~Bn. The first panel 12 and the second panel 14 are, for example, display panels that can display a color gamut composed of red (R), green (G) or blue (B), respectively. Pixels R1~Rn can, for example, display red, pixels G1~Gn can, for example, display green, and pixels B1~Bn can, for example, display blue, but are not limited thereto. Pixels of the same color are arranged in multiple rows along direction X, and pixels of different colors in each row alternate in direction Y. Through this design, the light of pixels of different colors alternating along direction Y in the auxiliary light-emitting area is refracted through the curved area of the protective layer, so that the pixels can be stretched at the same rate, thereby reducing the rainbow pattern phenomenon. The pixel arrangement in this embodiment is only an example, and the pixels may also be arranged in other ways. For example, the pixels R1 -Rn, the pixels G1 -Gn, and the pixels B1 -Bn may not be aligned but may be arranged in a staggered manner.

[0048] In addition, the present disclosure can also design the width of the pixels in the auxiliary light emitting area along the direction X according to the curvature of the auxiliary light emitting area of the display panel and / or the curvature of the curved surface area of the protective layer. Figure 3 As shown, pixels of the same color (e.g., pixels R1 to R5) in the auxiliary light emitting area 121-2 of the first panel 12 have different widths and / or lengths. In one embodiment, the pixels R1 to R5 in the curved light emitting area 121-2 of the first panel 12 may selectively have gradually smaller widths and / or lengths to compensate for the stretching of the image caused by the refraction of the protective layer by the pixels R1 to R5 in the auxiliary light emitting area 121-2, thereby improving the deformation of the displayed image. Similarly, the pixels R1 to R5 in the auxiliary light emitting area 141-2 of the second panel 14 may also have different widths and / or lengths. In one embodiment, the pixels R1 to R5 in the curved light emitting area 141-2 of the second panel 14 may selectively have gradually smaller widths and / or lengths. It should be understood that the number and size changes of pixels shown in the figure are examples for ease of explanation and are not intended to limit the scope of the present disclosure. In actual application, the design should be based on the display requirements. The first panel 12 and the second panel 14 are not limited to displaying the RGB color gamut, and may include pixels of other colors in other embodiments. The width of a pixel is measured approximately perpendicular to the bending axis, and the length of a pixel is measured approximately parallel to the bending axis.

[0049] It should be understood that in some embodiments, the above arrangement design can also be made for pixels corresponding to the curved areas 16c and 18c outside the protective layers 16 and 18 to improve the displayed image in these areas. For simplicity, this is not detailed here.

[0050] Please refer to Figure 4 . Figure 4FIG. 1 is a cross-sectional view of a spliced display device 10b in an unfolded state according to an embodiment of the present disclosure. Figure 2 and Figure 3 The embodiment shown differs in that Figure 4 The first panel 12 and the second panel 14 of the spliced display device 10b are generally planar display panels, and their light exit areas are not bent. The light exit area 121 of the first panel 12 is entirely the main light exit area 121-1, and the light exit area 141 of the second panel 14 is entirely the main light exit area 141-1. The peripheral area PR1-1 of the first panel 12 and the peripheral area PR2-1 of the second panel 14 are adjacently arranged on either side of the splicing line AX1 and are located on the same horizontal plane as the main light exit areas 121-1 and 141-1.

[0051] The first panel 12 and the second panel 14 may be joined together in any suitable manner. Figure 4 As shown, a first support layer 102 can be provided on the lower surface BS1 of the first panel 12, and a second support layer 104 can be provided on the lower surface BS2 of the second panel 14. Then, a connector (not shown) can be used to connect the first and second panels 12, 14 to a shared axis device 26, so that the first and second panels 12, 14 can be relatively unfolded or folded along the rotation axis RX3. The above splicing method is only an example and is not intended to limit the present disclosure.

[0052] The protective layer 16 may include a planar region 16a corresponding to the primary light emitting area 121-1 of the first panel 12, and a curved region 16b corresponding to the peripheral region PR1-1 of the first panel 12 and extending from a starting point P1 to an end point P2 of the curved surface. Similarly, the protective layer 18 may include a planar region 18a corresponding to the primary light emitting area 141-1 of the second panel 14, and a curved region 18b corresponding to the peripheral region PR2-1 of the second panel 14 and extending from a starting point P1 to an end point P2 of the curved surface. The connection between the starting point P1 and the end point P2 of the curved surface region 16b and the curved surface region 18b may be any curved line, such as, but not limited to, an arc with a fixed radius of curvature or an arc with a gradually varying radius of curvature. When the video wall 10b is unfolded, that is, when the primary light emitting area 121-1 and the primary light emitting area 141-1 are substantially located on the horizontal plane HSP (i.e., the primary light emitting area 121-1 and the primary light emitting area 141-1 are aligned with the horizontal plane HSP), the end points P2 of the curved surface area 16b and the end points P2 of the curved surface area 18b contact each other, forming a recess 111-1. This creates a contact region CR between the protective layer 16 and the protective layer 18. The top of the contact region CR substantially overlaps with the position of the end point P2, while the bottom of the contact region CR is at the same level as the upper surface TS1 of the first panel 12 and / or the upper surface TS2 of the second panel 14. The position and area of the contact region CR will vary depending on the structure of the video wall 10b or the different modes of unfolding and folding, but the contact region CR is substantially located on an extension of the video wall AX1. The contact region CR can be a line or a contact surface, but is not limited thereto.

[0053] Please continue to refer to Figure 4 The projection of the top surface TS1 of the first panel 12 to the bottom of the contact region CR in direction Z is a distance X1. The projection of the top surface TS2 of the second panel 14 to the bottom of the contact region CR in direction Z is a distance X2. The projection of the top of the contact region CR (i.e., the end point P2 of the curve) to the top surface TS1 of the first panel 12 and / or the top surface TS2 of the second panel 14 (or from the top of the contact region CR to the bottom of the contact region CR) in direction Z has a height H. The planar area 16a of the protective layer 16 has a thickness T1, and the planar area 18a of the protective layer 18 has a thickness T2. When the following formula 1 is satisfied, the dark areas caused by the peripheral areas PR1-1 and PR2-1 can be improved, reducing the impact of the dark area between the second display area AA2 of the first panel 12 and the fourth display area AA4 of the second panel 14 on the user's observation. Together with the first display area AA1 and the third display area AA3, an expanded display area AA is formed.

[0054] 0≦H / (Xn+Tn)<0.8 (Formula 1)

[0055] In Formula 1, the distance Xn and the thickness Tn represent any one of the distance X1 and thickness T1 between the first panel 12 and the corresponding protective layer 16, and the distance X2 and thickness T2 between the second panel 14 and the corresponding protective layer 18. The distance Xn can be adjusted according to product requirements. In some embodiments, the distance Xn can be greater than or equal to 0 and less than or equal to 200 μm. Figure 4 In one embodiment, distance Xn is substantially equal to 0. Formula 1 indicates that the ratio of height H to the sum of thickness Tn and distance Xn is greater than or equal to 0 and less than 0.8. In some embodiments, distance X1 may be substantially equal to distance X2, and thickness T1 may be substantially equal to thickness T2, but the present invention is not limited thereto.

[0056] Please continue to refer to Figure 4 The projection of the curved surface area 16b of the protective layer 16 of the first panel 12 from the starting point P1 to the end point P2 on the horizontal plane HSP has a distance L1. The projection of the curved surface area 18b of the protective layer 18 of the second panel 14 from the starting point P1 to the end point P2 on the horizontal plane HSP has a distance L2. The projection of the peripheral area PR1-1 of the first panel 12 on the horizontal plane HSP has a width B1. The projection of the peripheral area PR2-1 of the second panel 14 on the horizontal plane HSP has a width B2. The projection of the first panel 12 on the horizontal plane HSP has a width D1. The projection of the second panel 14 on the horizontal plane HSP has a width D2. When the following equation 4 is satisfied, the dark areas caused by the peripheral areas PR1-1 and PR2-1 can be improved, reducing the impact of the dark area between the second display area AA2 of the first panel 12 and the fourth display area AA4 of the second panel 14 on the user's observation. Together with the first display area AA1 and the third display area AA3, an expanded display area AA is formed.

[0057] Dn / 2≧Ln≧Bn (Formula 4)

[0058] In Formula 4, width Dn, width Bn, and distance Ln represent any one of a set of widths D1, B1, and L1 between the first panel 12 and the corresponding protective layer 16, and a set of widths D2, B2, and L2 between the second panel 14 and the corresponding protective layer 18. Formula 4 indicates that distance Ln is less than or equal to half of distance Dn and greater than or equal to width Bn. In some embodiments, distance L1 may be optionally equal to distance L2, width D1 may be optionally equal to width D2, and width B1 may be optionally equal to width B2. In some embodiments, distance L1 may be optionally different from distance L2, width D1 may be optionally different from width D2, and width B1 may be optionally different from width B2, but the present invention is not limited thereto. As long as at least one of the above Formulas 1 or 4 is satisfied, the display quality can be improved and the sense of discontinuity of the dark areas observed by the user at the splicing point can be reduced.

[0059] Figure 4 The portion of the protective layer 16 of the spliced display device 10b corresponding to the peripheral area PR1-2 of the first panel 12 and the portion of the protective layer 18 corresponding to the peripheral area PR2-2 of the second panel 14 may respectively include a curved area 16c and a curved area 18c to provide optical compensation for the peripheral area PR1-2 and the peripheral area PR2-2, respectively. The curved area 16c extends from the starting point P1' of the curve to the end point P2' of the curve, and its projection on the horizontal plane HSP has a distance L1'. The curved area 18c extends from the starting point P1' of the curve to the end point P2' of the curve, and its projection on the horizontal plane HSP has a distance L2'. The projection of the peripheral area PR1-2 on the horizontal plane HSP has a width B1', and the projection of the peripheral area PR2-2 on the horizontal plane HSP has a width B2'. When it is desired to improve the display effect of the peripheral area, the following formula 3 can be satisfied to achieve the effect of improving the dark areas caused by the peripheral areas PR1-2 and PR2-2, so that the expanded screen display area AA can extend to the outer edges of the first panel 12 and the second panel 18, achieving a display effect close to "full screen" or "borderless".

[0060] Dn / 2≧Ln'≧Bn'(Formula 3)

[0061] In Formula 3, width Dn, width Bn', and distance Ln' represent any one of the following: width D1, width B1', and distance L1' between the first panel 12 and the corresponding protective layer 16; and width D2, width B2', and distance L2' between the second panel 14 and the corresponding protective layer 18. Formula 3 indicates that distance Ln' is less than or equal to half of distance Dn and greater than or equal to width Bn'. In some embodiments, width B1' may be equal to width B2'. In some embodiments, width B1' may be different from width B2', but is not limited thereto.

[0062] Please refer to Figure 5 , Figure 5 The upper part is Figure 4 The spliced display device 10b of the illustrated embodiment is a partial cross-sectional view of the area near the splicing line AX1 in the unfolded state, illustrating that light from the first panel 12 and the second panel 14 is emitted from the display element layer (not shown) and passes through the protective layers 16 and 18 to display an image. Figure 5 The lower portion is a first panel 12 and a second panel 14 corresponding to Figure 5 A schematic diagram of the pixel array in the upper main light emitting area. Figure 5 Please refer to the upper direction axis for the upper direction. Figure 5 Please refer to the lower direction axis for the orientation of the lower part.

[0063] The spliced display device 10b can also reduce the rainbow pattern and / or display image distortion caused by light passing through the curved area 16b of the protective layer 16 and the curved area 18b of the protective layer 18 by pixel design, thereby reducing the discontinuity of the image or the sense of splicing seams between the second display area AA2 and the fourth display area AA4. Figure 5 The lower portion illustrates the pixel arrays of the first panel 12 adjacent to the peripheral region PR1-1 and the second panel 14 adjacent to the peripheral region PR2-1. Pixels R1-Rn can, for example, display red, pixels G1-Gn can, for example, display green, and pixels B1-Bn can, for example, display blue, but are not limited thereto. Pixels of the same color are arranged in multiple columns along the X direction, and pixels of different colors in each column alternate along the Y direction. With this design, pixels of different colors alternating along the Y direction near the curved surface area in the main light-emitting area are refracted through the curved surface area of the protective layer and can be stretched at the same rate, thereby reducing the rainbow pattern. Figure 5 The pixel arrangement in the illustrated embodiment is merely an example, and the pixels may be arranged in other ways. For example, the pixels R1 -Rn, the pixels G1 -Gn, and the pixels B1 -Bn may not be aligned but may be arranged in a staggered manner.

[0064] In some embodiments, the width of the pixels in the adjacent peripheral area along the direction X can also be designed according to the curvature of the curved area 16b of the protective layer 16 and the curved area 18b of the protective layer 18 to compensate for the image stretching caused by the refraction of the protective layer and improve the display image distortion. Figure 5 As shown in the lower part, the pixels of the same color of the first panel 12 and the second panel 14, such as pixels R1 to R5, have different widths and / or lengths. In one embodiment, the pixels R1 to R5 of the first panel 12 and the second panel 14 may have gradually larger widths and / or lengths. It should be understood that the above Figure 5 The width variations of pixels R1 to R5 are shown for example only. In actual applications, the design should be based on the display requirements. Pixel width is generally measured perpendicular to the rotation axis, while pixel length is generally measured parallel to the rotation axis.

[0065] Please refer to Figure 6 , Figure 6 for Figure 4 The cross-sectional view of the spliced display device 10b is shown in a partially folded state, for example, with the lower surface BS1 of the first panel 12 folded toward the lower surface BS2 facing away from the second panel 14. Some components or film layers (such as electrodes, active layers of thin film transistors (TFTs), and signal lines) in the folding area of a conventional foldable spliced display device may be damaged by the stress generated when the display device is bent or flexed, thereby affecting the light emission quality and the performance of the thin film transistors. Figure 6The folding method shown is to cause the first panel 12 and the second panel 14 to unfold or fold relative to each other along the rotation axis RX3, reducing the chance of defects caused by repeated bending or flexing of the first panel and / or the second panel itself, thereby improving the stability and reliability of the foldable spliced display device. In other embodiments, the first panel and the second panel can have different sizes. It should be understood that in other embodiments, the design of a connecting member (not shown) can also be used to fold the upper surface TS1 of the first panel 12 toward the upper surface TS2 of the second panel 14.

[0066] Please refer to Figure 7 . Figure 7 FIG2 is a cross-sectional view of a spliced display device 10c according to an embodiment of the present disclosure in an unfolded state. The spliced display device 10c includes a first panel 12 and a second panel 14 located on both sides of a splicing line AX2. A protective layer 16 is disposed on the first panel 12, and a protective layer 18 is disposed on the second panel 14. That is, most of the protective layer 16 is disposed correspondingly to the first panel 12, while the protective layer 18 is disposed correspondingly to the second panel 14. Figure 1 ) in the position of the splicing line AX as shown in Figure 7 As shown, the highest point in the cross-sectional diagram is roughly the reference. The splicing line AX and the splicing line AX2 may not be aligned in the Z direction. Figures 4 to 6 The embodiment shown differs in that Figure 7 The curved area 16b of the protective layer 16 extends toward the second panel 14 and is disposed on at least a portion of the peripheral area PR2-1 of the second panel 14 to provide optical compensation for both the peripheral area PR1-2 of the first panel 12 and the peripheral area PR2-2 of the second panel 14.

[0067] like Figure 7As shown, a protective layer 16 disposed on a panel 12 includes a planar region 16a corresponding to the primary light emitting area 121-1 of the first panel 12, and a curved region 16b corresponding to the peripheral region PR1-1 of the first panel 12 and the peripheral region PR2-1 of the second panel 14, extending from a starting point P1 to an end point P2 of the curved surface. A protective layer 18 is correspondingly disposed on the second panel 14 and includes a planar region 18a and a curved region 18b extending from a starting point P1 to an end point P2 of the curved surface, both corresponding to the primary light emitting area 141-1 of the second panel 14. The connection between the starting point P1 and the end point P2 of the curved region 16b and the curved region 18b can be any curved line, such as, but not limited to, an arc with a fixed radius of curvature or an arc with a gradually varying radius of curvature. When the video wall 10c is unfolded, that is, when the main light exit area 121-1 and the main light exit area 141-1 are substantially located on the horizontal plane HSP (that is, the main light exit area 121-1 and the main light exit area 141-1 are aligned with the horizontal plane HSP), the end points P2 of the curved surface area 16b and the end points P2 of the curved surface area 18b contact each other, forming a recess 111-1, and forming a contact region CR between the protective layer 16 and the protective layer 18. The top of the contact region CR substantially overlaps with the position of the end point P2, and the bottom of the contact region CR is at the same level as the upper surface TS1 of the first panel 12 and / or the upper surface TS2 of the second panel 14. The position and area of the contact area CR will vary with the structure of the spliced display device 10c or the different states of expansion and folding, but the contact area CR will be substantially parallel to the extension line of the splicing line AX2, that is, parallel to the direction Y, and the contact area CR can be a line or a contact surface, but is not limited thereto. Figure 7 As shown, when the spliced display device 10c is unfolded, the projection of the protective layer 16 on the horizontal plane HSP has a length LL1, and the projection of the protective layer 18 on the horizontal plane HSP has a length LL2. In some embodiments, the length LL1 of the protective layer 16 is greater than the length LL2 of the protective layer 18.

[0068] Please continue to refer to Figure 7The projection of the upper surface TS1 of the first panel 12 to the lowest point (the lower surface BS1 of the first panel 12 in this embodiment) in the direction Z has a distance X1, the projection of the upper surface TS2 of the second panel 14 to the lowest point (the lower surface BS2 of the second panel 14 in this embodiment) in the direction Z has a distance X2, the projection of the top of the contact area CR (i.e., the end point P2 of the curved surface) to the lower surface BS1 of the first panel 12 and / or the lower surface BS2 of the second panel 14 in the direction Z has a height H, and the distance from the starting point P1 of the curved surface to the end point P2 of the curved surface area 16b of the protective layer 16 is on the horizontal plane H. The projection of the curved surface area 18b of the protective layer 18 on the horizontal plane HSP has a distance L1. The projection of the curved surface starting point P1 to the curved surface end point P2 of the curved surface area 18b on the horizontal plane HSP has a distance L2. The projection of the peripheral area PR1-1 on the horizontal plane HSP has a width B1, and the projection of the peripheral area PR2-1 on the horizontal plane HSP has a width B2. The planar area 16a of the protective layer 16 has a thickness T1, and the planar area 18a of the protective layer 18 has a thickness T2. The projection of the first panel 12 on the horizontal plane HSP has a width D1, and the projection of the second panel 14 on the horizontal plane HSP has a width D2. To improve the display effect in the peripheral areas, the following equation 5 can be selected to improve the dark areas caused by the peripheral areas PR1-1 and PR2-1, thereby reducing the impact of the dark area between the second display area AA2 of the first panel 12 and the fourth display area AA4 of the second panel 14 on the user's observation. Together with the first display area AA1 and the third display area AA3, an expanded display area AA is formed.

[0069] (1 / 2)D1≧L1≧B1+B2 (Formula 5)

[0070] Equation 5 indicates that distance L1 is less than or equal to half of distance D1 and greater than or equal to the sum of widths B1 and B2. In some embodiments, width D1 may be equal to width D2, and width B1 may be equal to width B2. In some embodiments, width D1 may be different from width D2, and width B1 may be different from width B2, but the present invention is not limited thereto.

[0071] Please refer to Figure 8 , Figure 8 for Figure 7 The illustrated cross-sectional view of the spliced display device 10c is partially folded, for example, with the lower surface BS1 of the first panel 12 folded toward the lower surface BS2 of the second panel 14. When the spliced display device 10c is folded, the peripheral region PR2-1 of the second panel 14 is exposed from the curved region 16b of the protective layer 16.

[0072] Please refer to Figure 9 . Figure 9FIG2 is a cross-sectional view of a spliced display device 10d according to an embodiment of the present disclosure in an unfolded state. The spliced display device 10d includes a first panel 12 and a second panel 14 located on both sides of a splicing line AX3, and a protective layer 16 and a protective layer 18 disposed on the first panel 12 and the second panel 14, respectively. That is, most of the protective layer 16 is disposed correspondingly to the first panel 12, while the protective layer 18 is disposed correspondingly to the second panel 14. Figure 1 ) in the position of the splicing line AX as shown in Figure 9 As shown, the highest point in the cross-sectional diagram is roughly the reference. The splicing line AX and the splicing line AX3 may not be aligned in the Z direction. Figure 7 The embodiment shown differs in that Figure 9 The length L2 of the projection of the curved surface area 18b of the protective layer 18 on the horizontal plane HSP is close to or equal to zero. In other words, the starting point P1 of the curved surface area 18b is substantially directly above the end point P2 of the curved surface. In this embodiment, the curved surface area 16b of the protective layer 16 of the first panel 12 extends toward the second panel 14 and is disposed over at least a portion of the peripheral area PR2-1 of the second panel 14. This provides optical compensation for both the peripheral area PR1-2 of the first panel 12 and the peripheral area PR2-2 of the second panel 14, thereby reducing the effect of the dark area between the second display area AA2 of the first panel 12 and the fourth display area AA4 of the second panel 14 on the user's perception.

[0073] Please refer to Figure 10 . Figure 10 FIG. 1 is a cross-sectional view of a spliced display device 10 e in an unfolded state according to an embodiment of the present disclosure. Figure 10 The spliced display device 10e is similar to Figure 4 The spliced display device 10b includes a first panel 12 and a second panel 14 that are substantially planar, and a protective layer 16 and a protective layer 18 that are respectively disposed on the first panel 12 and the second panel 14. A contact region CR is formed between the protective layer 16 and the protective layer 18.

[0074] Figure 10 and Figure 4 The main difference is that Figure 10 The projection width D3 of the protective layer 16 of the spliced display device 10e on the horizontal plane HSP is greater than the projection width D1 of the first panel 12 on the horizontal plane HSP, and the projection width D4 of the protective layer 18 on the horizontal plane HSP is greater than the projection width D2 of the second panel 14 on the horizontal plane HSP. Therefore, the protective layer 16 protrudes from the edge of the first panel 12, and the protective layer 18 protrudes from the edge of the second panel 14.

[0075] In detail, Figure 10 and Figure 4The main difference is that the curved region 16b of the protective layer 16 protrudes beyond the edge of the peripheral region PR1-1 of the first panel 12, while the curved region 18b of the protective layer 18 protrudes beyond the edge of the peripheral region PR2-1 of the second panel 14. Therefore, when the spliced display device 10e is in the unfolded state, the protective layers 16 and 18 contact each other in the contact region CR. However, the peripheral regions PR1-1 of the first panel 12 and PR2-1 of the second panel 14 do not contact each other, but instead form a gap 111-2 between them. The gap 111-2 is positioned opposite the recess 111-1 between the curved regions 16b and 18b.

[0076] Please continue to refer to Figure 10 When the following formula 6 is satisfied, the dark areas caused by the peripheral areas PR1-1 and PR2-1 can be improved, thereby reducing the impact of the dark area between the second display area AA2 of the first panel 12 and the fourth display area AA4 of the second panel 14 on the user's observation. Together with the first display area AA1 and the third display area AA3, an expanded display area AA is formed.

[0077] Dn / 2≧Ln>Bn (Formula 6)

[0078] In Formula 6, the width Dn, the width Bn, and the distance Ln represent any one of the width D1, the width B1, and the distance L1 of the projections of the first panel 12 and the corresponding protective layer 16 on the horizontal plane HSP, and the width D2, the width B2, and the distance L2 of the projections of the second panel 14 and the corresponding protective layer 18 on the horizontal plane HSP.

[0079] Furthermore, the present disclosure can also optimize the design of the curve between the starting point P1 and the end point P2 of the curved surface area 16b and the curved surface area 18b. This can reduce the sense of discontinuity or seams in the spliced display device 10e, and / or reduce image stretching caused by refraction of the protective layer, thereby improving displayed image distortion. In some embodiments, the curve between the starting point P1 and the end point P2 of the curved surface area 16b and the curved surface area 18b can be designed as an arc curve CV, which can be, for example, an elliptical curve, but is not limited to this.

[0080] Figure 10 The protective layer 16 is taken as an example for explanation. Figure 10 In FIG. 1 , midpoint I is the midpoint of the tangent line that cuts through starting point P1 and ending point P2 of curved surface region 16b. Intersection point K is the intersection of tangent line TL1 that cuts through starting point P1 and tangent line TL2 that cuts through ending point P2. Intersection point J is the intersection of the line connecting midpoint I and intersection point K and arc curve CV of curved surface region 16b. Midpoint I and intersection point K are separated by a distance K1, and midpoint I and intersection point J are separated by a distance J1.

[0081] In some embodiments, the planar region 16 a of the protection layer 16 is located on the tangent line TL1 , and the contact region CR is located on the tangent line TL2 .

[0082] When the following equation 7 is satisfied, the display quality can be further improved, and the sense of discontinuity of the dark area at the splicing position observed by the user can be reduced.

[0083] 0≦J1 / K1≦1 (Formula 7)

[0084] In one embodiment, J1 / K1 may be between 0.2 and 0.6, or J1 / K1 may be close to 0.4, or when the curve between the starting point P1 and the end point P2 of the curved surface is similar to an elliptical curve, a better effect of improving display quality may be achieved.

[0085] In summary, the present disclosure, through the design of the protective layer, can reduce the impact of the dark area between the two spliced panels on the user's perception, thereby achieving the goal of improving display quality. In addition, the present disclosure can selectively improve the rainbow pattern phenomenon and / or display image distortion near the spliced area through the design of the pixel.

[0086] The foregoing description is merely an example of the present disclosure and is not intended to limit the present disclosure. Persons skilled in the art will readily appreciate that the present disclosure is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present disclosure are intended to be within the scope of protection of the present disclosure.

Claims

1. A splicing display device, characterized in that: include: a first panel and a second panel; and a first protective layer and a second protective layer, wherein the first protective layer is disposed on the first panel, and the second protective layer is disposed on the second panel, In which, a curved area of the first protective layer and a curved area of the second protective layer have a contact area, the contact area is straight in the cross-sectional view, and the projection distance from the curved surface starting point to the curved surface end point of the curved area of the first protective layer is greater than the projection distance from the curved surface starting point to the curved surface end point of the curved area of the second protective layer and covers a portion of the second panel.

2. The splicing display device according to claim 1, wherein: In the cross-sectional view, the first panel includes a width D1, a peripheral area of the first panel includes a width B1, a peripheral area of the second panel includes a width B2, and the projection distance of the curved area of the first protective layer is L1, wherein the width D1, the width B1, the width B2, and the projection distance L1 satisfy the following relationship: (1 / 2)D1≧L1≧B1+B2.

3. The splicing display device according to claim 1, wherein: The curved area of the first protection layer covers a peripheral area of the first panel and a peripheral area of the second panel.

4. The splicing display device according to claim 1, wherein: The first protective layer further includes a plane area corresponding to a light emitting area of the first panel, and the second protective layer further includes a plane area corresponding to a light emitting area of the second panel.

Images