Display device

Abstract

The invention discloses a display device. The display device comprises a flexible display panel, a heat conducting sheet and a supporting plate, the flexible display panel has a first surface and a second surface. The first surface and the second surface are opposite to each other. The first surface is a display side. The heat-conducting sheet is disposed on the second surface of the flexible display panel. The supporting plate is arranged on the second surface of the flexible display panel and is arranged between the flexible display panel and the heat conduction sheet. In a cross-sectional view, the heat-conducting sheet has a first space, the support plate has a second space, and the first space and the second space are at least partially overlapped.

Description

[0001] This application is a divisional application of the invention patent application with the application date of August 3, 2020, application number 202010767082.8, and invention name “Display Device”. Technical Field

[0002] The present disclosure relates to an electronic device, and in particular to a rollable electronic device. Background Art

[0003] In recent years, electronic devices or deformable electronic devices have become one of the focuses of new generation electronic technology. Therefore, the demand for flexible display devices that can be integrated into electronic devices has also increased accordingly, such as rollable display devices.

[0004] When the battery system board in the rollable display device is working, it will generate heat and become a heat source. If the heat generated by the battery system board is not easy to dissipate quickly due to the structural design, the hot spots formed may affect heat-sensitive components and increase the probability of display abnormalities, thereby reducing the reliability of the display device. As consumers have higher and higher requirements for flexible display devices, how to develop display devices with higher reliability is one of the important issues for manufacturers. Summary of the invention

[0005] In view of this, the present disclosure provides a rollable display device having a novel heat-conducting structure. The novel heat-conducting structure can improve the heat-conducting property of the rollable display device or increase the reliability of the rollable display device.

[0006] According to some embodiments of the present disclosure, a display device is provided, comprising a rollable display panel and a thermal conductive sheet. The rollable display panel has two surfaces opposite to each other. The thermal conductive sheet is located on one of the two surfaces of the display panel. The thermal conductive sheet and the rollable display panel can be rolled together. The thermal conductive sheet has a thermal conductivity greater than 200 W / mK.

[0007] According to the rollable display device of the disclosed embodiment, by adjusting the shape, structure and / or thermal conductivity of the heat conductive sheet, the heat generated by the heat source in the rollable display device can be evenly dispersed, thereby reducing the temperature of the hot spot. In this way, the thermal conductivity of the rollable display device can be improved, or the reliability of the rollable display device can be enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of a display device in an unfolded state or a partially rolled state according to the first embodiment of the present disclosure.

[0009] Figure 2 FIG. 4 is a schematic top view of the display device according to the first embodiment after being fully unfolded.

[0010] Figure 3 For the corresponding Figure 2 Schematic side view of .

[0011] Figure 4 To correspond to Figure 2 A side view schematic diagram of a variant embodiment of the present invention.

[0012] Figure 5 FIG. 4 is a schematic diagram of a display device in a partially rolled state according to a second embodiment of the present disclosure.

[0013] Figure 6 For the corresponding Figure 2 A side view schematic diagram of an embodiment of the present invention.

[0014] Figure 7 For the corresponding Figure 2 A side view schematic diagram of another variant embodiment of the present invention.

[0015] Figure 8 For the corresponding Figure 2 A side view schematic diagram of another variant embodiment of the present invention.

[0016] Fig. 9 A bottom view schematically illustrates an embodiment of the present disclosure.

[0017] Fig.10 A bottom view schematically illustrates an embodiment of the present disclosure.

[0018] Fig.11 A bottom view schematically illustrates an embodiment of the present disclosure.

[0019] Fig.12 A side view schematic diagram of a modified embodiment of the heat conductive sheet according to the present disclosure is shown.

[0020] Fig.13 A side view schematic diagram of a modified embodiment of the heat conductive sheet according to the present disclosure is shown.

[0021] Fig.14 A side view schematic diagram of a modified embodiment of the heat conductive sheet according to the present disclosure is shown.

[0022] Fig.15 FIG. 4 is a schematic side view of a display device according to a third embodiment.

[0023] Fig.16 is a schematic diagram of a display device in an unfolded state according to a fourth embodiment.

[0024] Fig.17FIG. 4 is a schematic diagram of a variation of the display device according to the fourth embodiment.

[0025] Fig.18 FIG. 4 is a schematic diagram of another variation of the display device according to the fourth embodiment.

[0026] Fig.19 To correspond to Figure 1 A schematic top view of a display device according to a fifth embodiment of the present invention.

[0027] Fig. 20 FIG. 4 is a schematic side view of a display device according to a variation of the fifth embodiment.

[0028] Fig.21 To correspond to Fig. 20 A schematic diagram of a top view of a display device when unfolded.

[0029] Fig. 22 To correspond to Fig.21 A schematic side view of a display device when rolled up.

[0030] Fig.23 Plot corresponding to Fig. 20 or Fig. 22 A bottom view schematic diagram of an implementation method of.

[0031] Fig.24 Plot corresponding to Fig. 20 or Fig. 22 Schematic diagram of an implementation method.

[0032] Fig.25 FIG. 1 is a schematic partial cross-sectional side view of a display device according to a sixth embodiment.

[0033] Explanation of reference numerals: 100, 101-display device; 105-first rollable area; 106-second rollable area; 107-display area; 109-axis; 110-rollable display panel; 111-first surface; 112-second surface; 113-first area; 113'-second circle; 114-second area; 115-peripheral area; 115A-part of the peripheral area; 115B-part of the peripheral area; 116-active area; 117-flexible substrate; 118-display layer; 120-support plate; 121-flexible substrate; 122-flexible substrate; 123-flexible substrate; 124-flexible substrate; 125-flexible substrate; 126-flexible substrate; 127-flexible substrate; 128-flexible substrate; 129-flexible substrate; 130-flexible substrate; 131-flexible substrate; 132-flexible substrate; 133-flexible substrate; 134-flexible substrate; 135-flexible substrate; 136-flexible substrate; 137-flexible substrate; 138-flexible substrate; 139-flexible substrate; 140-flexible substrate; 141-flexible substrate; 142-flexible substrate; 143-flexible substrate; 144-flexible substrate; 145-flexible substrate; 146-flexible substrate; 147-flexible substrate; 148-flexible substrate; 149-flexible substrate; 150-flexible substrate; 151-flexible substrate; 152-flexible substrate; 153-flexible substrate; 154-flexible substrate; 155-flexible substrate; 156-flexible substrate; 157-flexible 0S, 140S-surface; 121-groove; 122-auxiliary thermal conductive material; 130-electronic system; 1301-flexible board module; 140-thermal conductive sheet; 141-first part; 142-second part; 143-recess; 144-groove; 145-protrusion; 160-housing; 163-ventilation hole; 164-ventilation blade; 170-thermal conductive frame; 240-opening; D11, D12, D2, D3-direction; L-length; R-curling radius; T1, T2, T3, T5, T6-thickness; W-width. DETAILED DESCRIPTION

[0034] The present disclosure can be understood by referring to the following detailed description in conjunction with the accompanying drawings. It should be noted that in order to facilitate the understanding of the readers and for the simplicity of the drawings, the multiple drawings in the present disclosure only depict a portion of the electronic device, and the specific elements in the drawings are not drawn according to the actual scale. In addition, the number and size of each element in the drawings are only for illustration and are not intended to limit the scope of the present disclosure.

[0035] Certain words are used throughout this disclosure and in the appended claims 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.

[0036] In the following description and claims, the words “including” and “comprising” are open-ended words, and thus should be interpreted as meaning “including but not limited to…”.

[0037] It should be understood that when an element or a film layer is referred to as being "on" or "connected to" another element or film layer, it may be directly on or directly connected to the other element or layer, or there may be an intervening element or film layer between the two (indirect case). Conversely, when an element is referred to as being "directly on" or "directly connected to" another element or film layer, there may be no intervening element or film layer between the two.

[0038] Although the terms first, second, third, etc. can be used to describe a variety of components, the components are not limited to these terms. These terms are only used to distinguish a single component from other components in the specification. The same terms may not be used in the claims, but may be replaced by first, second, third, etc. according to the order in which the components are declared in the claims. Therefore, in the following description, the first component may be the second component in the claims.

[0039] It should be noted that the following embodiments may replace, reorganize, or mix the technical features in several different embodiments to implement other embodiments without departing from the spirit of the present disclosure.

[0040] Figure 1 Schematic diagram of the display device 100 in an unfolded state or a partially rolled state according to the first embodiment of the present disclosure. Figure 1 The display device 100 includes a rollable display panel 110, an optional support plate 120 disposed under the rollable display panel 110, and a heat conductive sheet 140. In some embodiments, the display device 100 may also selectively include an electronic system 130 physically and / or electrically connected to the rollable display panel 110, for example, to provide power, display information, or signals to the rollable display panel 110, but not limited thereto. The rollable display panel 110 has two surfaces opposite to each other, for example, a first surface 111 and a second surface 112 (see Figure 3 ).like Figure 1 and Figure 3 As shown, the first surface 111 may be the display side of the rollable display panel 110, and the second surface 112 may be the back side of the rollable display panel 110. The heat conductive sheet 140 may be located on one of the two surfaces of the rollable display panel 110, for example, on the side of the second surface 112, and may be rolled together with the rollable display panel 110.

[0041] The rollable display panel 110 may include a flexible substrate 117 (see Figure 3 ) and the display layer 118 located on the flexible substrate (see Figure 3). The flexible substrate may be a transparent or opaque organic polymeric material, for example, it may include polyimide (PI), polycarbonate (PC), polyethyleneterephthalate (PET), or a combination thereof, but the present disclosure is not limited thereto. The flexible substrate may also include, for example, thin glass, or any suitable material. The display layer may include any type of display medium, electronic components and / or light-emitting components, for example, the display medium may include liquid crystal, fluorescence, phosphor, light-emitting diode, other suitable display medium, or a combination thereof, but the present disclosure is not limited thereto. The electronic components may include (but are not limited to) transistors, capacitors and / or wires, etc. The light-emitting component may be an organic light-emitting diode (OLED), a micro light-emitting diode (micro-LED), a sub-millimeter light-emitting diode (mini-LED), a quantum dot LED (QDLED), a nanowire LED or a bar type LED, but is not limited thereto. The type of the LED is not limited, for example, it may be a flip chip type LED or a vertical type LED, but the present disclosure is not limited thereto. The rollable display panel 110 may generate heat when the display device 100 is in use.

[0042] The display device 100 disclosed in the present invention may be a flexible electronic device, and may be rolled up using a rolling axis (not shown) as an axis 109. The display device 100 disclosed in the present invention may also have a rolling radius R in the rolled up state, such as Figure 1 As shown. "Flexible" here means that the electronic device can be bent (curved), bent (bent), folded (folded), rolled (rolled), flexed (flexible), stretched (Stretch) and / or other similar deformations, and "rollable" is used below to represent the above deformations. The display device 100 may further include an antenna device, a sensing device or a splicing device, but the present disclosure is not limited to this. The antenna device may be, for example, a liquid crystal antenna. The splicing device may be, for example, a display splicing device or an antenna splicing device. It should be noted that the electronic device may be any combination of the aforementioned arrangements, but the present disclosure is not limited to this.

[0043] The optional support plate 120 can be disposed on the second surface 112 of the rollable display panel 110 when necessary, and can be used to support the rollable display panel 110. The support plate 120 can be a plate with thickness, such as an organic support plate or an inorganic support plate. The organic support plate can be polyimide, and the inorganic support plate can be a metal or an alloy, such as a stainless steel plate, but the present disclosure is not limited thereto.

[0044] The electronic system 130 may include one or more electronic components or computing units, such as a battery, a system board, a printed circuit board (PCB), a chip on film (COF), a flexible printed circuit assembly (FPCA), or a combination thereof, but the present disclosure is not limited thereto. Figure 1 In the embodiment, the electronic system 130 includes a flexible board module 1301 as an example, but not limited thereto. The electronic system 130 may be a signal input terminal of the display device 100 for the rollable display panel 110, and may generate heat and become a heat source when the display device 100 is in use.

[0045] According to some embodiments, the heat conducting sheet 140 may be designed differently according to different regions of the rollable display panel 110. Figure 1 As shown, the rollable display panel 110 may include a first area 113 and a second area 114. The rollable display panel 110 in the first area 113 and the second area 114 may have different properties. The first area 113 and the second area 114 may be different areas, and the second area 114 may be a portion outside the first area 113. According to some embodiments, Figure 1 As shown, the first region 113 may be closer to the electronic system 130, and the second region 114 may be farther from the electronic system 130. According to some embodiments, compared with the second region 114, the first region 113 may be a region with a higher temperature in the display device 100 and has a higher requirement for heat conduction. According to some embodiments, the first region 113 may be closer to the curling axis 109, and the second region 114 may be farther from the axis 109.

[0046] Figure 1 FIG. 4 shows that at least a portion of the display device 100 is in an unfolded state. Figure 1As shown, part of the rollable display panel 110 surrounds the electronic system 130 in a rollable manner. In this case, the first area 113 of the rollable display panel 110 may be the part of the rollable display panel 110 surrounding the electronic system 130, which may be an inner circle or a first circle. The second area 114 of the rollable display panel 110 may be the part outside the first area 113, which may be an outer circle or a second circle, surrounding the first area 113 (inner circle). Since the electronic system 130 generates heat, the first area 113 of the rollable display panel 110 surrounding the electronic system 130 will be directly affected by the heat and affect the performance of the panel. According to some embodiments, a heat conductive sheet may be provided at the position of the first area 113 of the rollable display panel 110, which may improve the heat conduction effect of the electronic system 130, so that the rollable display panel 110 is less affected by the heat source of the electronic system 130. According to some embodiments, a heat conductive sheet may be provided in at least a part of the first area 113 of the rollable display panel 110.

[0047] Figure 2 is a top view of the display device 100 according to the first embodiment of the present disclosure after being fully unrolled. Figure 3 To correspond to Figure 2 Please refer to the side view diagram of Figure 2 , the rollable display panel 110 may include a bonding pad 150. The soft board module 1301 of the electronic system 130 of the display device 100 may be physically connected to the rollable display panel 110, or the soft board module 1301 may be electrically connected to the rollable display panel 110 via the bonding pad 150. According to some embodiments, the rollable display panel 110 may include a peripheral area 115 and an active area 116. According to some embodiments, the peripheral area 115 may be located outside the active area 116, for example, the peripheral area 115 may surround the active area 116. According to some embodiments, a portion of the peripheral area 115 ( Figure 2 The portion 115A of the peripheral region shown in FIG. 1 may be located between the active region 116 and the electronic system 130, or a portion (115A) of the peripheral region 115 may be closer to the electronic system 130 than the active region 116. Figure 2 As shown, the first area 113 of the rollable display panel 110 may be a portion 115A closer to the peripheral area of ​​the electronic system 130, and the second area 114 may be an area outside the first area 113. For example, the second area 114 may include an active area 116 and a portion 115B farther from the peripheral area of ​​the electronic system 130.

[0048] Please refer to Figure 3, is a schematic side view of the display device 100 in an unfolded state. The rollable display panel 110 may include a flexible substrate 117 and a display layer 118 located on the flexible substrate 117. Figure 3 As shown, according to some embodiments, the heat conductive sheet 140 may include a first portion 141 and a second portion 142. The bonding pad 150 may be disposed closer to the first portion 141 and farther from the second portion 142. In other words, the bonding pad 150 may be disposed closer to the first portion 141 than the second portion 142. The first portion 141 may have a better heat dissipation characteristic, for example, a better heat dissipation characteristic than the second portion 142, but the present disclosure is not limited thereto. The better heat dissipation characteristic of the first portion 141 may be achieved through a larger thickness, or through a material having a larger thermal conductivity coefficient, or through both. As necessary, the first portion 141 and the second portion 142 of the heat conductive sheet 140 may be interchangeable. For example, the second portion 142 may be closer to the bonding pad 150 than the first portion 141.

[0049] According to some embodiments, Figure 3 As shown, the first portion 141 of the heat conductive sheet 140 may be disposed corresponding to the first area 113 of the rollable display panel 110, and the second portion 142 of the heat conductive sheet 140 may be disposed corresponding to the second area 114 of the rollable display panel 110, but the present invention is not limited thereto. For example, the first area 113 is closer to the electronic system 130 than the second area 114, and the first portion 141 may also be closer to the electronic system 130 than the second portion 142. According to some embodiments, the first area 113 is closer to the axis 109 of the rollable display panel than the second area 114, and the first portion 141 may also be closer to the axis 109 than the second portion 142 ( Figure 1 According to some embodiments, Figure 1 As shown, the first area 113 may be an inner circle, the first part 141 also corresponds to the inner circle, the second area 114 is an outer circle, and the second part 142 may also correspond to the outer circle. According to some embodiments, compared with the second area 114, the first area 113 may be closer to the heat source and is a region with a higher heat conduction requirement than the second area 114. For example, the heat source may include an electronic system 130. According to some embodiments, the first area 113 may be a fixed curling area, and the second area 114 may be a repeated curling area (back and forth curling area). According to some embodiments, the rollable display panel 110 in the first area 113 may be fixedly accommodated in the housing, and the rollable display panel 110 in the second area 114 may be pulled out of the housing. The following embodiments respectively describe the specific implementation of the first area 113 and the second area 114, and the specific implementation of the first part 141 and the second part 142 of the thermal conductive sheet 140.

[0050] According to some embodiments, see Figure 3 The first area 113 may be a fixed curling area, and the second area may be a back and forth curling area. The first portion 141 of the heat conductive sheet 140 may be arranged corresponding to the first area 113, and the second portion 142 may be arranged corresponding to the second area 114. By designing that the first portion 141 of the heat conductive sheet 140 is thicker than the second portion 142, better heat conduction characteristics can be provided for the fixed curling area.

[0051] According to some embodiments, the boundary between the first portion 141 and the second portion 142 of the thermal conductive sheet 140 may be the same as the boundary between the first area 113 and the second area 114 of the rollable display panel 110. Alternatively, according to some embodiments, the boundary between the first portion 141 and the second portion 142 of the thermal conductive sheet 140 may be different from the boundary between the first area 113 and the second area 114 of the rollable display panel 110. According to some embodiments, the first portion 141 of the thermal conductive sheet 140 corresponds to the first area 113 of the rollable display panel 110, and the second portion 142 of the thermal conductive sheet 140 corresponds to the second area 114 of the rollable display panel 110. Specifically, the first area 113 of the rollable display panel 110 may be an inner circle. For example, Figure 3 As shown, at least a portion of the first portion 141 of the heat conductive sheet 140 is disposed in the first region 113 (inner circle) of the rollable display panel 110, and at least a portion of the second portion 142 of the heat conductive sheet 140 is disposed in the second region 114 (outer circle) of the rollable display panel 110. Figure 3 As shown, part of the first portion 141 of the heat conductive sheet 140 is disposed in the first region 113 (inner circle) of the rollable display panel 110, and another part of the first portion 141 of the heat conductive sheet 140 may be located in the second region 114. Although not shown in the figure, according to some embodiments, the entire first portion 141 of the heat conductive sheet 140 may be located in the first region 113. At least part of the second portion 142 of the heat conductive sheet 140 may be located in the second region 114, and another part of the second portion 142 may be located in the first region 113.

[0052] According to some embodiments, the better thermal conductivity of the first portion 141 may be achieved by a larger thickness T1 of the first portion 141. For example, the first region 113 of the rollable display panel 110 is closer to the electronic system 130 and may be a region requiring high thermal conductivity. Figure 3The first portion 141 may correspond to the high thermal conductivity requirement area (first region 113), and the thickness T1 of the first portion 141 may be greater than the thickness T2 of the second portion 142. For example, the thickness T1 of the first portion 141 is greater than the thickness T2, so that the first portion 141 located at the thermal conductive sheet 140 has better heat transfer characteristics. The greater thickness T1 of the first portion 141 is conducive to quickly conducting the heat of the electronic system 130 to the entire first portion 141, and then to the second portion 142. The thicker thickness T1 of the first portion 141 can allow sufficient heat energy to be smoothly transferred to the thermal conductive sheet 140, so that the thermal conductive sheet 140 has better utilization efficiency.

[0053] According to some embodiments, the better thermal conductivity of the first portion 141 can be achieved by a material with a larger thermal conductivity coefficient of the first portion 141. For example, the thermal conductivity coefficient of a material of the first portion 141 can be greater than the thermal conductivity coefficient of a material of the second portion 142. As required, the thickness of the first portion 141 and the second portion 142 can be the same or different. Figure 4 To correspond to Figure 2 The heat conductive sheet 140 may have a thermal conductivity greater than 200 W / mK. Figure 4 The first portion 141 may correspond to the high thermal conductivity requirement area (first area 113), and the thermal conductivity coefficient of the first portion 141 may be greater than the thermal conductivity coefficient of the second portion 142. The specific material of the thermal conductive sheet 140 may include diamond, silver, copper, gold, aluminum, graphite and a combination thereof, but is not limited thereto. If the first portion 141 of the thermal conductive sheet 140 uses a material with a larger thermal conductivity coefficient, it may be beneficial to quickly conduct the heat of the electronic system 130 to the first portion 141. According to some embodiments, if the thermal conductive sheet 140 includes a composite material, the thermal conductivity coefficient of the thermal conductive sheet 140 may be mainly the thermal conductivity coefficient of the material with the maximum thermal conductivity coefficient. The measurement of the thermal conductivity coefficient may be that after analyzing the various components (or elements) of the thermal conductive sheet, the thermal conductivity coefficient corresponding to each component (or element) may be obtained by looking up a table. Alternatively, it may also be obtained by measuring the thermal conductive sheet with a thermal conductivity analyzer. According to some embodiments, the better thermal conductivity characteristics of the first portion 141 may also be achieved by the larger thermal conductivity coefficient of the first portion 141 and the larger thickness T1.

[0054] Please refer to Figure 4In addition to being physically connected to the rollable display panel 110, the electronic system 130 can also be physically connected to the heat conductive sheet 140 by extending. For example, the electronic system 130 can be extended and bent backward toward the back side of the rollable display panel 110 in a rollable manner, so that the two ends of the electronic system 130 can be physically connected to the rollable display panel 110 and the first portion 141 of the heat conductive sheet 140, respectively. Such a configuration is conducive to directly and quickly conducting the heat of the electronic system 130 to the first portion 141.

[0055] Figure 5 Schematic diagram of a display device 100 in a partially rolled state according to a second embodiment of the present disclosure. According to the display device 100 of the second embodiment of the present disclosure, in a rolled state or a semi-rolled state, there may be a second circle 113' that rolls up and surrounds the first area 113 that may be the first circle. The rolled state may be a state in which most of the area of ​​the rollable display panel 110 or the heat conductive sheet 140 has a curvature. The portion of the rollable display panel 110 that is closer to the axis 109 may be referred to as a fixed rolling area of ​​the rollable display panel 110. In some embodiments, the fixed rolling area may, for example, correspond to the first area 113 of the rollable display panel 110. Regardless of whether it is in a rolled state or an unfolded state, the fixed rolling area will be rolled up, that is, forming a first circle surrounding the electronic system 130. The fixed rolling area may not have a display function or provide no display. The portion of the rollable display panel 110 other than the fixed rolling area may be referred to as a back-and-forth rolling area of ​​the rollable display panel 110. The back-and-forth rolling area may, for example, include the second circle 113' and correspond to the second area 114. When the rollable display panel 110 is in the unfolded state, the back-and-forth rolling area is generally unfolded into a plane (eg Figure 1 shown).

[0056] Figure 6 For the corresponding Figure 2 According to some embodiments, the active area 116 of the rollable display panel 110 may be located after the first circle. In detail, the second area 114 of the rollable display panel 110 may include the active area 116, and the first area 113 of the rollable display panel 110 may include a portion 115A near the peripheral area of ​​the electronic system 130. Figure 6As shown, the first portion 141 of the heat conductive sheet 140 corresponds to the first area 113 of the rollable display panel 110, and the second portion 142 of the heat conductive sheet 140 corresponds to the second area 114 of the rollable display panel 110. For example, at least a portion of the first portion 141 of the heat conductive sheet 140 may be located in the first area 113, and at least a portion of the second portion 142 of the heat conductive sheet 140 may be located in the second area 114 (active area 116). Such a design is beneficial for reducing the probability of display abnormalities in the display device 100 due to heat, so the reliability of the rollable display device 100 can be increased. Specifically, the first area 113 of the rollable display panel 110 may be a portion 115A close to the peripheral area of ​​the electronic system 130. For example, as Figure 6 As shown, according to some embodiments, the entire first portion 141 of the thermal conductive sheet 140 may be located in the first region 113 (the portion 115A of the peripheral region). At least a portion of the second portion 142 of the thermal conductive sheet 140 may be located in the second region 114 (the active region 116), and another portion of the second portion 142 may be located in the first region 113. Although not shown in the figure, according to some embodiments, a portion of the first portion 141 of the thermal conductive sheet 140 is disposed in the first region 113 (the portion 115A of the peripheral region) of the rollable display panel 110, another portion of the first portion 141 is disposed in the second region 114 (the active region 116) of the rollable display panel 110, and the entire second portion 142 of the thermal conductive sheet 140 is disposed in the second region 114 (the active region 116) of the rollable display panel 110.

[0057] According to some embodiments, the surface of the heat conductive sheet 140 may be provided with an opening 240. The opening 240 may be a groove and / or a trench. Figure 7 For the corresponding Figure 2 A side view schematic diagram of another variant embodiment of the present invention. The thickness of the thermal conductive sheet 140 in the fixed curling area (first area 113) may be T3, and the thickness of the thermal conductive sheet 140 in the back and forth curling area (second area 114) may be smaller. The thermal conductive sheet 140 may include at least one groove 143. In this way, a protrusion 145 of the thermal conductive sheet 140 may be formed between the grooves 143. The groove 143 may be recessed into the surface 140S of the thermal conductive sheet 140, but the groove 143 may not expose the rollable display panel 110 or the support plate 120 on the other side of the thermal conductive sheet 140. That is, the groove 143 may not penetrate the thermal conductive sheet 140. By providing at least one groove 143 on the thermal conductive sheet 140, the average thickness of the thermal conductive sheet 140 can be reduced. The heat conducting surface area of ​​the heat conducting sheet 140 may be increased, and / or the flexibility of the rolling area may be increased, which is beneficial to increase the reliability of the rollable display panel 110 in the rolling area (second area 114). The average thickness is calculated as follows: Fig. 9 and the corresponding instructions.

[0058] Figure 8 For the corresponding Figure 2 The heat conductive sheet 140 may include at least one opening 240 (groove 144). The groove 144 may be recessed into the surface 140S of the heat conductive sheet 140, and the bottom of the groove 144 may also expose a portion of the rollable display panel 110 or the support plate 120. Figure 8 The groove 144 is shown to expose a portion of the support plate 120. That is, the groove 144 can penetrate the heat conductive sheet 140. In this way, a protrusion 145 of the heat conductive sheet 140 can be formed between the grooves 144. Through the design of the opening 240, the average thickness of the heat conductive sheet 140 can be reduced. In addition, the heat conductive surface area of ​​the heat conductive sheet 140 can be increased, and / or the flexibility of the back-and-forth rolling area can be increased, which can be more conducive to increasing the reliability of the rollable display panel 110 in the back-and-forth rolling area.

[0059] Fig. 9 A bottom view of an embodiment of the present disclosure is shown. According to some embodiments, such as Fig. 9 As shown, the heat conductive sheet 140 may include a plurality of openings 240. The openings 240 may be grooves 143, trenches 144, or a combination thereof. The extending direction D11 of the grooves 143 or trenches 144 may be perpendicular to the unfolding direction D2 of the display device 100. Fig.10 As shown, the extension direction D12 of the groove 143 or the groove 144 can be designed to be parallel to the expansion direction D2 of the display device 100. The average thickness of the heat conductive sheet 140 is calculated as follows. Fig. 9The method shown. For example, the width of the thermal conductive sheet 140 is W, and the width W may be the width in a direction perpendicular to the unfolding direction D2 of the display device 100. The width of the thermal conductive sheet 140 may be divided into four parts, and the thicknesses of 10 points are measured along each horizontal line at 0.25W, 0.5W, and 0.75W, respectively, and the average thickness of the thermal conductive sheet 140 is obtained by averaging, but the present disclosure is not limited thereto. If the designs of the first part 141 and the second part 142 of the thermal conductive sheet 140 are different, the average thicknesses of the first part 141 and the second part 142 may be calculated separately. According to some embodiments, the first part 141 of the thermal conductive sheet 140 may be arranged corresponding to the first area 113, and the second part 142 may be arranged corresponding to the second area 114. The thickness of the first part 141 in the first area 113 may be measured, and the thickness of the second part 142 in the second area 114 may be measured. The above-mentioned method of dividing the width of the thermally conductive sheet 140 into four parts can be adopted to measure the thickness of the first part 141 and the second part of the thermally conductive sheet 140 in the first area 113 and the second area 114, respectively. The distances between two adjacent points of the 10 points taken in one area can be equal. That is, there can be 10 points at the same distance. However, the measurement of the average thickness is not limited to this. According to some embodiments, 2 points can also be taken in one area for thickness measurement. According to some embodiments, samples of the thermally conductive sheet 140 of the same size, for example, samples of 1 square centimeter, can be taken out from the first area 113 and the second area 114 of the rollable display panel 110, and then the thickness can be measured. According to some embodiments, the thickness of the thermally conductive sheet 140 may not be limited to the average thickness, but may also be the thickness of a specific position.

[0060] Fig.11 A bottom view schematic diagram of an embodiment according to the present disclosure is shown. In another embodiment of the present invention, Fig.11 As shown, the grooves 143 or the grooves 144 can be unevenly distributed in the unfolding direction D2 of the display device 100, so that the average thickness of different areas can be different. For example, if the flexibility requirement of the first area 113 is greater than that of the second area 114, more grooves 143 or grooves 144 can be arranged in the first area 113 closer to the electronic system 130, that is, the distribution density of the grooves 143 or grooves 144 can be greater, wherein the distribution density can represent the number of grooves 143 or grooves 144 per unit area of ​​the heat conductive sheet 140, or the area occupied by the grooves 143 or grooves 144 per unit area of ​​the heat conductive sheet 140, but the present disclosure is not limited thereto.

[0061] Fig.12A schematic side view of a variation of the embodiment of the thermal conductive sheet 140 is shown. The thermal conductive sheet 140 may have one or more protrusions 145. For example, the thermal conductive sheet 140 may include a first portion 141 and a second portion 142, and a plurality of protrusions 145 may be provided in the back-and-forth curling area corresponding to the second portion 142. The density of the protrusions 145 may be different depending on the situation, but the present disclosure is not limited thereto. The protrusions 145 may increase the thermal conductive surface area of ​​the thermal conductive sheet 140, or may increase the flexibility of the back-and-forth curling area, which is beneficial to increase the reliability of the rollable display panel 110 in the back-and-forth curling area. The density of the protrusions 145 may adjust the curling radius R of the rollable display panel 110.

[0062] Fig.13 A side view schematic diagram of a variation of the heat conductive sheet 140 is shown. The thickness T5 of the first portion 141 of the heat conductive sheet 140 may be greater than the thickness T6 of the second portion 142. The protrusions 145 and the openings 240 may be evenly arranged in the first portion 141 and the second portion 142, but the disclosure is not limited thereto. The thickness of the fixed curling area is thicker, so that sufficient heat energy can be smoothly transferred to all the protrusions 145, so that all the protrusions 145 have the best utilization efficiency.

[0063] Fig.14 A schematic side view of a variation of the embodiment of the heat conductive sheet 140 is shown. One or more protrusions 145 and openings 240 may be evenly disposed in the second portion 142 of the heat conductive sheet 140. The thickness T5 of the first portion 141 of the heat conductive sheet 140 may be greater than the thickness T6 of the second portion 142, but the disclosure is not limited thereto. The thickness design of this variation of the embodiment is thinned from the first portion 141 closer to the electronic system to the second portion 142, so that the heat conductive sheet 140 can absorb enough heat from the electronic system portion and quickly transfer it to the surrounding thinner portion.

[0064] Fig.151 is a schematic side view of a display device 100 according to a third embodiment of the present disclosure. If it is desired to increase the thermal conductivity of the display device 100, it can also be achieved by having the groove 121 of the heat conductive sheet 140 penetrate deeply into the support plate 120 as required by the situation. For example, the heat conductive sheet 140 may include a first portion 141 located in the first area 113 and a second portion 142 located in the second area 114. There may be at least one groove 121 in the support plate 120 as required by the situation. The at least one groove 121 of the support plate 120 may be recessed into the surface 120S of the support plate 120, and the groove 121 may further expose a portion of the rollable display panel 110. The groove 121 penetrates deeply into the surface 120S of the support plate 120, or the support plate 120 may also be designed to be thin, which can increase the flexibility of the back-and-forth curling area when it is frequently curled, and is conducive to increasing the reliability of the rollable display panel 110 in the back-and-forth curling area. The position of the groove 144 of the thermal conductive sheet 140 can overlap with the hole position of the groove 121 of the support plate 120, which can reduce the risk of peeling of the two layers of the rollable display panel 110 when curling and maintain the adhesion between the two layers. According to some embodiments, auxiliary thermal conductive material 122 can also be used to fill the groove 121 and / or the groove 144. For example, the auxiliary thermal conductive material 122 can be filled in part of the groove 121 and / or the groove 144, or the auxiliary thermal conductive material 122 can be partially filled in the groove 124 and / or the groove 144 without filling the groove 121 and / or the groove 144, but the present disclosure is not limited to this. The auxiliary thermal conductive material 122 can be a thermal conductive paste, a thermal conductive glue, or a combination thereof, but the present disclosure is not limited to this.

[0065] Fig.16 is a schematic diagram of a display device 100 in an unfolded state according to a fourth embodiment of the present disclosure. According to some embodiments, Fig.16In the fourth embodiment of the present disclosure, the display device 100 may further include a housing 160. In the folded state, the housing 160 may accommodate the rollable display panel 110 and the heat conductive sheet 140. According to some embodiments, the housing 160 may accommodate the rollable display panel 110, the support plate 120, and the electronic system (not shown). When the housing 160 is rotated in the D3 direction, the rollable display panel 110 and the heat conductive sheet 140 may be pulled out of the housing 160 together to obtain the unfolded state of the display device 100. Please refer to the above, the electronic system (not shown) and / or the rollable display panel 110 may generate heat when the display device 100 is in use. According to the display device 100 of the fourth embodiment of the present disclosure, the display device 100 includes a housing 160, and at least a portion of the heat generated by the rollable display panel 110 may be dissipated by the housing 160 via the heat conductive sheet 140. In other words, according to some embodiments, the heat generated by the rollable display panel 110 may be transferred in the direction of: first through the heat conductive sheet, and then through the housing. Theoretically, the heat transfer direction is from high temperature to low temperature. Therefore, by respectively detecting the surface temperatures of the rollable display panel 110, the heat conductive sheet 140, and the housing 160, the heat transfer direction can be known from the temperature. According to some embodiments, the detection position of the surface temperature of the rollable display panel 110 may be a position closer to the bonding pad 150. According to some embodiments, the detection position of the surface temperature of the rollable display panel 110 may be a position adjacent to the scroll bar. According to some embodiments, the detection position of the surface temperature of the rollable display panel 110 may be the first area of ​​the rollable display panel 110. According to some embodiments, the detection position of the surface temperature of the rollable display panel 110 may be a position corresponding to the first portion 141 of the heat conductive sheet 140. According to some embodiments, the detection position of the surface temperature of the rollable display panel 110 may correspond to a position closer to the first portion 141 of the thermal conductive sheet 140 .

[0066] Please refer to the combined Figure 3 and Fig.16 , Figure 3 The rollable display panel 110 is shown in a fully unfolded state. Fig.16The rollable display panel 110 is partially shown in a rolled-up state. Part of the rollable display panel 110 can be rolled up and accommodated in a housing 160. According to some embodiments, the first area 113 of the rollable display panel 110 can be an inner area of ​​the housing, that is, the second area 114 can be an outer area of ​​the housing. The first portion 141 of the heat conductive sheet 140 can be arranged corresponding to the first area 113, and the second portion 142 can be arranged corresponding to the second area 114. In other words, the inner area of ​​the housing can be the portion of the heat conductive sheet 140 accommodated in the housing 160 when the display device 100 is in a fully unfolded state, and the outer area of ​​the housing can be the portion of the heat conductive sheet 140 not accommodated in the housing 160 when the display device 100 is in a fully unfolded state. The inner area of ​​the housing can have better thermal conductivity than the outer area of ​​the housing. The better thermal conductivity of the inner shell area can be achieved by the heat conductive sheet 140 having a larger thickness T1 in the inner shell area (first area 113), for example, the thickness T1 in the inner shell area can be greater than the thickness T2 of the outer shell area (second area 114). For details on the heat conductive sheet 140 having a larger thickness T1 in the inner shell area, please refer to the above content.

[0067] Fig.17 FIG. 1 is a schematic diagram of a variation of the display device 100 according to the fourth embodiment of the present disclosure. Fig.16 or Fig.17 As shown, the housing 160 may be designed with ventilation holes 163 to increase the heat conduction capacity of the housing. The ventilation holes 163 on the housing 160 may include: Fig.16 The plurality of holes shown, or Fig.17 Concentric rings are shown, but the disclosure is not limited thereto.

[0068] Fig.18 FIG. 1 is a schematic diagram of another variation of the display device 100 according to the fourth embodiment of the present disclosure. According to some embodiments, the housing 160 may be designed with ventilation blades 164 to increase the heat conduction capability of the housing 160. For example, the ventilation blades 164 on the housing 160 may help generate air disturbances when the heat conductive sheet 140 is stored in the housing 160 or rotated in the D3 direction and pulled out of the housing 160, thereby increasing the heat conduction capability of the housing 160, but the present disclosure is not limited thereto.

[0069] Fig.19 To correspond to Figure 1 A top view of a display device 100 according to a fifth embodiment of the present disclosure Fig.19 The heat conducting sheet 140 of the display device 100 is shown, corresponding to Figure 1For example, according to some embodiments, if the width of the rollable display panel 110 is W, the width of the heat conductive sheet 140 may be greater than 0.5W, but the present disclosure is not limited thereto. When the heat conductive sheet 140 has a curling radius of R in the curled state, the length of the heat conductive sheet 140 may be greater than 2πR. When the length of the heat conductive sheet 140 is greater than 2πR, the heat conductive sheet 140 has a curvature corresponding to the curvature of the rollable display panel 110. Figure 1 When the heat conducting sheet 140 is in the curled state, a portion of the heat conducting sheet 140 can still be exposed to the outside, which can help to increase the heat conducting capacity of the heat conducting sheet 140.

[0070] Fig. 20 FIG. 1 is a schematic side view of a display device 101 according to a variation of the fifth embodiment of the present disclosure. According to some embodiments, such as Fig. 20As shown, the display device 100 may have more than one rollable portion, such as a first rollable portion 105 and a second rollable portion 106, and the first rollable portion 105 and the second rollable portion 106 may be located at opposite sides of the rollable display panel 110. The first rollable portion 105 and the second rollable portion 106 may have a roll radius R in a roll state. The display portion 107 of the rollable display panel 110 may be disposed between the first rollable portion 105 and the second rollable portion 106. At least one of the first rollable portion 105 and the second rollable portion 106 may include one or more electronic components or computing units, such as bonding pads (not shown), batteries (not shown), system boards (not shown), printed circuit boards (PCB), chip on film (COF), flexible printed circuit assembly (FPCA) (not shown) or a combination thereof, but the present disclosure is not limited thereto. At least one of the first rollable area 105 and the second rollable area 106 may include an electronic system (not shown) of the display device 100, and a heat conductive sheet 140 may be disposed between the electronic system (not shown) and the rollable display panel 110, but the disclosure is not limited thereto. In this variant embodiment, the electronic system 130 may also be disposed in the display area 107, and may be physically and / or electrically connected to the heat conductive sheet 140 in the display area 107, so that when the rollable display panel 110 is rolled up, the electronic system 130 will still be exposed, which is beneficial to improving the heat conduction of the rollable display device 100. That is to say, regardless of whether the rollable display panel 110 is rolled up or unfolded, the electronic system 130 physically and / or electrically connected to the thermal conductive sheet 140 in the display area can quickly conduct heat to various locations via the thermal conductive sheet 140, for example, it can quickly conduct heat to the rollable display panel 110 in the display area 107 and / or can quickly conduct heat to at least one of the first rollable area 105 and the second rollable area 106, which is beneficial for the display device 100 to have better thermal conductivity characteristics, but the present disclosure is not limited to this.

[0071] Fig.21 To correspond to Fig. 20 Schematic diagram of a top view of the display device 101 when unfolded. If the width of the rollable display panel 110 is W, the width of the thermal conductive sheet 140 may be greater than 0.5W, but the present disclosure is not limited thereto. If the length of the rollable display panel 110 in the display area is L, the length of the thermal conductive sheet 140 may be greater than L, so that the thermal conductive sheet 140 can extend into at least one of the first rollable area 105 and the second rollable area 106, which is beneficial to increase the heat conduction capacity of the thermal conductive sheet 140.

[0072] Fig. 22To correspond to Fig.21 The heat conducting sheet 140 in at least one of the first rollable area 105 and the second rollable area 106 may include at least one of a groove 143 and a groove 144. The number of the grooves 143 and the grooves 144 may be selected as required. For details and advantages of the grooves 143 and the grooves 144, please refer to the above content. Fig. 22 The first rollable area 105 and the second rollable area 106 may include a groove 143 and a trench 144 , but the present disclosure is not limited thereto.

[0073] Fig.23 Plot corresponding to Fig. 20 or Fig. 22 The heat conductive sheet 140 may include a groove 143 and a groove 144 , and the groove 143 and the groove 144 may be disposed in at least one of the first rollable area 105 , the second rollable area 106 , and the display area 107 . Fig.23 It is shown that the groove 143 and the trench 144 can be disposed in the first rollable area 105 , the second rollable area 106 and the display area 107 , but the present disclosure is not limited thereto.

[0074] Fig.24 Plot corresponding to Fig. 20 or Fig. 22 The electronic system 130 can be disposed below the rollable display panel 110, or between the first rollable area 105 and the second rollable area 106, but the electronic system 130 will be exposed, which is beneficial to increase the heat conduction capability of the display device 101.

[0075] Fig.25 It is a schematic diagram of a partial cross-sectional side view of the display device 100 of the sixth embodiment of the present disclosure. The display device 100 of the sixth embodiment of the present disclosure may include a heat-conducting frame 170, which is beneficial to heat conduction in the planar direction and equalization of hot spots. For example, the heat-conducting frame 170 may be disposed below the heat-conducting sheet 140, so that the heat-conducting sheet 140 may be disposed between the heat-conducting frame 170 and the rollable display panel 110 or the support plate 120 that may be used as appropriate. For example, the heat-conducting frame 170 may be disposed in the first area 113, or disposed adjacent to the axis 109, but the present disclosure is not limited thereto. For example, according to some embodiments, when the heat-conducting sheet 140 is rolled up together with the rollable display panel 110, the heat-conducting frame 170 may not be rolled up together with the heat-conducting sheet 140 and the rollable display panel 110. For example, with Fig.16For example, the heat-conducting frame (not shown) may not be rolled together with the heat-conducting sheet 140 and the rollable display panel 110, but may be placed in the housing 160, but the disclosure is not limited thereto. The heat-conducting frame 170 may include a solid material, such as glass or plastic, or a highly heat-conductive material, such as metal or alloy, such as aluminum-magnesium alloy, but the disclosure is not limited thereto.

[0076] According to the rollable display device of the disclosed embodiment, the provision of a heat conductive sheet helps conduct and / or dissipate the heat generated by the rollable display panel, thereby improving the thermal conductivity of the rollable display device and enhancing the reliability of the rollable display device.

[0077] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A display device, characterized in that: include: A flexible display panel having a first surface and a second surface, wherein the first surface and the second surface are opposite to each other, and the first surface is a display side; a heat conductive sheet, disposed on the second surface of the flexible display panel; and a supporting plate, disposed on the second surface of the flexible display panel and between the flexible display panel and the heat conducting sheet; In a cross-sectional view, the heat conductive sheet has a first interval, the support plate has a second interval, and the first interval and the second interval at least partially overlap.

2. The display device according to claim 1, wherein: The thermal conductive sheet includes diamond, silver, copper, gold, aluminum, graphite, or a combination thereof.

3. The display device according to claim 2, wherein: The heat conductive sheet includes a first portion and a second portion, wherein the thickness of the first portion is greater than the thickness of the second portion.

4. The display device according to claim 3, characterized in that The flexible display panel includes a bonding pad, and the bonding pad is arranged closer to the first portion and farther from the second portion.

5. The display device according to claim 1, wherein: The heat conductive sheet has a thermal conductivity greater than 200 W / mK.

6. The display device according to claim 1, wherein: In the cross-sectional view, the first interval of the heat conductive sheet is greater than the second interval of the support plate.

7. The display device according to claim 1, wherein: The flexible display panel includes a display layer.

8. The display device according to claim 7, characterized in that The display layer includes organic light emitting diodes.

9. The display device according to claim 1, wherein: The flexible display panel is a rollable display panel.

10. The display device according to claim 1, wherein: The flexible display panel is a foldable display panel.

11. The display device according to claim 1, wherein: The flexible display panel is a stretchable display panel.

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