Composite display device

Abstract

A composite display device comprises a composite display, a brightness acquisition module, a picture management module and a panel control module. The composite display comprises a first display panel and a second display panel which are arranged oppositely. The brightness acquisition module is connected with the composite display and acquires ambient brightness around the composite display. The picture management module is connected with the brightness acquisition module and generates a first picture setting signal and a second picture setting signal according to the ambient brightness. The panel control module is connected with the picture management module and the composite display, and respectively controls the first display panel and the second display panel to project the first picture and the second picture based on the first picture setting signal and the second picture setting signal to form a composite picture. Therefore, the effects of picture optimization and energy conservation can be considered at the same time.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a display device, and more particularly to a composite display device. BACKGROUND

[0002] With the development of technology and market demand, outdoor displays can be seen everywhere outdoors, but the picture clarity of outdoor displays under the sun still needs to be improved. The existing solution is to increase screen brightness to resist bright ambient light, which not only increases power consumption, but also increases heat energy, resulting in a shortened service life of outdoor displays.

[0003] Among the characteristics of cholesteric liquid crystal displays (ChLCD), in addition to the planar mode that controls the transmittance of the panel to reflect ambient light to provide a picture, there is also the focal conic mode that allows backlight to penetrate. Because it can maintain the above two states without power consumption, it is called bistable state. At this time, if an active light-emitting display is placed on the back of the cholesteric liquid crystal display and combined, a new type of display can be formed. When the ambient light is sufficient, the cholesteric liquid crystal display is used as the main source of the display picture, and in a dim environment, the active light-emitting display is used as the main source of the display picture, achieving the effect of saving energy, but not taking into account the bottleneck encountered when the two displays display pictures at the same time. For example, based on the stacking structure of the two displays, the transmittance of the front display greatly affects the luminous intensity of the rear display, making the color of the overall picture display uneven, affecting the viewing experience of the user. Therefore, how to adjust the picture to maintain the uniformity of the existing picture color has become a problem that the relevant industry practitioners urgently want to solve. UTILITY MODEL CONTENT

[0004] The purpose of the present disclosure is to provide a composite display device that uses the ambient brightness around the composite display as a criterion for determining which of the front first display panel or the rear second display panel to present the picture, and determines the second picture setting signal for controlling the luminous intensity of the second display panel according to the first picture setting signal for controlling the first display panel to switch between different gray scales, achieving picture color uniformity. In addition, through the cooperation of the picture management module and the panel control module, the first display panel and the second display panel can be driven to display different pictures respectively, thereby indirectly prolonging the service life of the composite display and reducing maintenance costs.

[0005] According to an embodiment of the present disclosure, a composite display device is provided. The composite display device includes a composite display, a brightness obtaining module, a screen management module, and a panel control module. The composite display includes a first display panel and a second display panel. The first display panel has a first viewable area. The second display panel is stacked on the first display panel and has a second viewable area, and the second viewable area at least partially overlaps the first viewable area. The brightness obtaining module is connected to the composite display and is configured to obtain an ambient brightness around the composite display. The screen management module is connected to the brightness obtaining module. The screen management module is configured to generate a first screen setting signal corresponding to the first display panel according to the ambient brightness, and generate a second screen setting signal corresponding to the second display panel according to the first screen setting signal. The panel control module is connected to the screen management module and the composite display. The panel control module is configured to control the first display panel to display a first screen in the first viewable area based on the first screen setting signal, and control the second display panel to display a second screen in the second viewable area based on the second screen setting signal, wherein the first screen and the second screen overlap to form a composite screen.

[0006] Other implementations of the aforementioned embodiment include the following. The aforementioned brightness obtaining module includes a sensing submodule, and the sensing submodule is configured to sense the ambient brightness around the composite display.

[0007] Other implementations of the aforementioned embodiment include the following. The aforementioned brightness obtaining module includes a remote submodule, and the remote submodule is signal connected to a cloud server and is configured to obtain the ambient brightness from the cloud server according to a location information of the composite display.

[0008] Other implementations of the aforementioned embodiment include the following. The aforementioned screen management module is configured to determine whether the ambient brightness is greater than a reference brightness to generate a brightness determination result. When the brightness determination result is yes, the panel control module is configured to control the first display panel to operate in a reflective mode based on the first screen setting signal, and control the second display panel to be turned off based on the second screen setting signal. When the brightness determination result is no, the panel control module is configured to control the first display panel to operate in a transmissive mode based on the first screen setting signal, and control the second display panel to be turned on based on the second screen setting signal.

[0009] Other implementations of the aforementioned embodiment include the following. The aforementioned first screen setting signal includes transmissive spectral data. The screen management module is configured to extract a first transmittance, a second transmittance, and a third transmittance corresponding to a red spectrum, a green spectrum, and a blue spectrum, respectively, from the transmissive spectral data, and adjust a first intensity parameter, a second intensity parameter, and a third intensity parameter corresponding to the red spectrum, the green spectrum, and the blue spectrum in the second screen setting signal according to the first transmittance, the second transmittance, and the third transmittance.

[0010] Other implementations of the aforementioned embodiment include the following: The aforementioned picture management module obtains a picture content data, and divides the picture content data into a static picture data and a dynamic picture data. The picture management module integrates the static picture data into the first picture setting signal, so that the first picture presented by the first display panel presents a static picture. The picture management module integrates the dynamic picture data into the second picture setting signal, so that the second picture presented by the second display panel presents a dynamic picture, wherein the dynamic picture is different from the static picture.

[0011] Other implementations of the aforementioned embodiment include the following: The aforementioned picture management module obtains a picture content data, and divides the picture content data into a first depth-of-field picture data and a second depth-of-field picture data. The picture management module integrates the first depth-of-field picture data into the first picture setting signal, so that the first picture presented by the first display panel presents a first depth-of-field picture. The picture management module integrates the second depth-of-field picture data into the second picture setting signal, so that the second picture presented by the second display panel presents a second depth-of-field picture, wherein the second depth-of-field picture is different from the first depth-of-field picture.

[0012] Other implementations of the aforementioned embodiment include the following: The aforementioned composite display further includes an adhesive layer. The adhesive layer is disposed between the first display panel and the second display panel.

[0013] Other implementations of the aforementioned embodiment include the following: The aforementioned first visual area at least partially overlaps the second visual area to form an overlapping area, and an area ratio of the overlapping area to an area of the first display panel is greater than or equal to 50%.

[0014] Other implementations of the aforementioned embodiment include the following: The aforementioned first display panel is a cholesteric liquid crystal display panel.

[0015] Other implementations of the aforementioned embodiment include the following: The aforementioned second display panel is a mini Light Emitting Diode (mini LED) display panel, a micro Light Emitting Diode (micro LED) display panel, an Organic Light Emitting Diode (OLED) display panel, or a Perovskite Light Emitting Diode (PeLED) display panel. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A schematic diagram of a composite display device according to a first embodiment of the present disclosure is shown;

[0017] Figure 2 A cross-sectional view of a composite display according to the present disclosure is shown;

[0018] Figure 3 a top view of the composite display of Figure 2 Figure 1 ;

[0019] Figure 4 Figure 2 shows a flowchart illustrating a control method of the composite display device according to the first embodiment of the present disclosure;

[0020] Figure 5 Figure 3 shows a flowchart illustrating a step of generating the first and second picture setting signals in the control method of the composite display device of Figure 4 Figure 4;

[0021] Figure 6 Figure 5 shows a schematic diagram illustrating a transmission spectrum of the first display panel of the present disclosure;

[0022] Figure 7 Figure 6 shows a schematic diagram illustrating a spectrum-luminous intensity of the second display panel of the present disclosure;

[0023] Figure 8A Figure 7 shows a schematic diagram illustrating a static picture of the first display panel of the present disclosure;

[0024] Figure 8B Figure 8 shows a schematic diagram illustrating a dynamic picture of the second display panel of the present disclosure;

[0025] Figure 8C Figure 9 shows a schematic diagram illustrating a composite picture of the composite display of the present disclosure;

[0026] Figure 9A Figure 10 shows a schematic diagram illustrating a first depth-of-field picture of the first display panel of the present disclosure;

[0027] Figure 9B Figure 11 shows a schematic diagram illustrating a second depth-of-field picture of the second display panel of the present disclosure; and

[0028] Figure 9C Figure 12 shows a schematic diagram illustrating a composite picture of the composite display of the present disclosure.

[0029] Wherein, the reference signs are explained as follows:

[0030] 100: composite display device

[0031] 110: composite display

[0032] 1101: picture content data

[0033] 111: first display panel

[0034] 112: second display panel

[0035] 113: adhesive layer

[0036] 120: luminance obtaining module

[0037] 1201: ambient luminance

[0038] 121: sensing sub-module

[0039] 122: remote sub-module

[0040] 130: picture management module

[0041] 1301: reference luminance

[0042] 1302: artificial intelligence algorithm

[0043] 131: first picture setting signal

[0044] 1311: penetration spectrum data

[0045] 132: second picture setting signal

[0046] 140: panel control module

[0047] 141: first control signal

[0048] 142: second control signal

[0049] 150: cloud server

[0050] 200: control method of composite display device

[0051] M1: static picture

[0052] M2: dynamic picture

[0053] M3: first depth-of-field picture

[0054] M4: second depth-of-field picture

[0055] MC1, MC2: composite picture

[0056] P1: first intensity parameter

[0057] P2: second intensity parameter

[0058] P3: third intensity parameter

[0059] R1: first visible area

[0060] R2: second visible area

[0061] R3: overlapping area

[0062] S01, S02, S021, S022, S023, S03: steps

[0063] BS: blue spectrum

[0064] GS: green spectrum

[0065] RS: red spectrum

[0066] X, Y, Z: direction DETAILED DESCRIPTION

[0067] Embodiments of the present disclosure will be described hereinafter with reference to the drawings. For the purpose of explanation, numerous specific details will be set forth in the description below. It should be appreciated that these specific details are not intended to limit the present disclosure in any manner. Rather, the present disclosure is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure. Also, for the purpose of simplicity and clarity, some of the conventional and well-known structures and devices are not described in detail or are illustrated using simple block diagrams.

[0068] Furthermore, when an element (or a unit or a module, etc.) is referred to as being "connected" or "coupled" to another element, it means that the element is directly connected or coupled to the other element or an intervening element is present between the element and the other element. When an element is directly connected or coupled to another element, it means that no intervening element is present between the element and the other element. The terms first, second, third, etc. are used to describe various elements, and the elements are not limited by the terms. Thus, a first element can be referred to as a second element. Also, a combination of elements / units / circuits is not a combination that is generally known, conventional, or well-known in the art, and whether the combination of elements / units / circuits is easily made by those of ordinary skill in the art cannot be determined by whether the elements / units / circuits are known.

[0069] Reference will now be made to the drawings, wherein Figure 1 , Figure 2 and Figure 3 wherein Figure 1 a schematic diagram of a composite display device according to a first embodiment of the present disclosure is shown; Figure 2 a cross-sectional view of a composite display of the present disclosure is shown; and Figure 3 a top view of the composite display of Figure 2 It should be noted that, for the purpose of illustrating the structural configuration of the elements of the composite display device 100, Figure 1 the composite display 110 is shown in an exploded view. As shown in Figure 1 the composite display device 100 includes a composite display 110, a luminance acquisition module 120, a screen management module 130, and a panel control module 140.

[0070] The composite display 110 includes a first display panel 111 and a second display panel 112. The first display panel 111 is disposed in front of the second display panel 112 along a stacking direction (i.e., direction Z) and has a first viewable area R1. The second display panel 112 is disposed in front of the first display panel 111 and has a second viewable area R2 at least partially overlapping the first viewable area R1. A brightness obtaining module 120 is electrically connected to the composite display 110 and is configured to obtain an ambient brightness 1201 around the composite display 110. A picture management module 130 is electrically connected to the brightness obtaining module 120 and obtains the ambient brightness 1201 from the brightness obtaining module 120. The picture management module 130 generates a first picture setting signal 131 corresponding to the first display panel 111 according to the ambient brightness 1201 and generates a second picture setting signal 132 corresponding to the second display panel 112 according to the first picture setting signal 131. A panel control module 140 is electrically connected to the picture management module 130 and the composite display 110 and receives the first picture setting signal 131 and the second picture setting signal 132 from the picture management module 130. The panel control module 140 feeds a first control signal 141 to the first display panel 111 based on the first picture setting signal 131 and feeds a second control signal 142 to the second display panel 112 based on the second picture setting signal 132. The panel control module 140 controls the first display panel 111 to project a first picture in the first viewable area R1 by the first control signal 141 and controls the second display panel 112 to project a second picture in the second viewable area R2 by the second control signal 142. Since the first picture and the second picture are projected in the direction Z, the first picture and the second picture overlap to form a composite picture. Thus, the composite display device 100 of the present disclosure can drive one of the first display panel 111 and the second display panel 112 to display a picture alone, or can drive the first display panel 111 and the second display panel 112 to display different pictures simultaneously, such as static and dynamic pictures or different stereoscopic effects with different depths of field, thereby creating a composite picture with various visual effects by picture overlapping.

[0071] As Figure 2As shown, the composite display 110 can further include an adhesive layer 113. The adhesive layer 113 is disposed between the first display panel 111 and the second display panel 112 to fix the first display panel 111 on the second display panel 112. The material of the adhesive layer 113 can be, but is not limited to, optical clear adhesive (OCA) or other suitable light-transmissive adhesive material. Since the thickness of the adhesive layer 113 is only tens to hundreds of microns, which can be ignored, the first display panel 111 and the second display panel 112 are closely attached to avoid interface reflection caused by air medium refractive index change, thereby reducing light transmission loss. In other embodiments, the first display panel can be disposed apart from the second display panel, i.e., air medium is reserved therebetween, to reduce the heat conduction between the two panels and the effect of cost control.

[0072] Specifically, the first display panel 111 can be a transmissive reflective display panel, which can be, for example, a cholesteric liquid crystal display panel, i.e., a display panel in a cholesteric liquid crystal display (ChLCD), and the second display panel 112 can be an active light-emitting display panel, which can be, for example, a mini light emitting diode (mini LED) display panel, a micro light emitting diode (micro LED) display panel, an organic light emitting diode (OLED), or a perovskite light emitting diode (PeLED) display panel, but the present disclosure is not limited thereto.

[0073] As shown in FIG. 1A, the first display panel 111 and the second display panel 112 can be disposed apart from each other, i.e., the first display panel 111 and the second display panel 112 are not in contact with each other. Figure 1 , Figure 3 As shown, the first visual area R1 can at least partially overlap the second visual area R2 to form an overlapping area R3, and the area ratio of the overlapping area R3 to the area of the first display panel 111 (i.e., the total panel area) can be 50% or more, and preferably, the aforementioned area ratio is 80% or more. In the present embodiment, the first visual area R1 and the second visual area R2 can be the effective pixel areas of the two panels, respectively, and the first visual area R1 and the second visual area R2 completely overlap, thereby maximizing the overlapping range of the first picture and the second picture.

[0074] In detail, the second display panel 112 can have a second viewable area R2 as an effective pixel area and a non-display area (not labeled separately) surrounding the second viewable area R2. The second viewable area R2 can include a plurality of pixels arranged in multiple rows and multiple columns along a direction X and a direction Y, respectively, where the direction X, the direction Y, and a direction Z are perpendicular to each other. Each pixel can include a light emitting element (e.g., a mini LED, a micro LED, an OLED, or a PeLED) and an active element (e.g., a thin-film transistor (TFT)). According to different product requirements, the plurality of light emitting elements can include a plurality of different color light emitting elements or a plurality of single color light emitting elements. If the pixels are displayed by the plurality of light emitting elements, the plurality of light emitting elements can include a plurality of red light emitting elements, a plurality of green light emitting elements, and a plurality of blue light emitting elements. The range of the non-display area can be the area between the second viewable area R2 and the frame of the second display panel 112. The non-display area can be provided with electronic elements (e.g., a driving circuit, a wafer, a conductive wire, etc.) to assist the second viewable area R2, but the present disclosure is not limited thereto.

[0075] In some embodiments, the composite display device 100 can further include a cloud server 150. The brightness obtaining module 120 can include a sensing submodule 121 and a remote submodule 122. The sensing submodule 121 can be, but is not limited to, a brightness sensor. The sensing submodule 121 is electrically connected to the composite display 110 and can be used to sense the ambient brightness 1201 around the composite display 110. The remote submodule 122 can be, but is not limited to, a wireless communicator. The remote submodule 122 is connected to the cloud server 150 (such as a weather forecast service) through an Internet network signal and can be used to obtain the ambient brightness 1201 from the cloud server 150 according to the location information of the composite display 110. In other embodiments, in order to reduce system cost, the brightness obtaining module only needs to be configured with either the sensing submodule or the remote submodule to obtain the ambient brightness.

[0076] In some embodiments, the picture management module 130 can be, but is not limited to, a timing controller (TCON), and the panel control module 140 can be, but is not limited to, a driver integrated circuit (IC). The picture management module 130 can include a processor and a memory. The memory stores a reference brightness 1301 and an artificial intelligence (AI) algorithm 1302. The ambient brightness 1201 and the reference brightness 1301 can be brightness values, while in other embodiments, the ambient brightness and the reference brightness can also be illuminance values, and the illuminance value can be, for example but not limited to, 2000 lux. The artificial intelligence algorithm 1302 can be, but is not limited to, a deep learning algorithm or a machine learning algorithm. The processor is electrically connected to the memory and performs two picture management functions based on the reference brightness 1301 and the artificial intelligence algorithm 1302, one of which is picture brightness correction and the other of which is picture content classification.

[0077] Regarding picture brightness correction, the picture management module 130 generates a first picture setting signal 131 according to the ambient brightness 1201, and sets the transmittance of the first display panel 111 (i.e., adjusts the gray scale value of the first picture) through the first picture setting signal 131, wherein the first picture setting signal 131 can include a transmittance spectrum data. After receiving the first picture setting signal 131 fed by the picture management module 130, the panel control module 140 can modify the transmittance of the first display panel 111 using the first control signal 141. It should be noted that the first display panel 111 has a reduced transmittance in some visible light bands due to various considerations in materials, manufacturing, and structural configuration, so the transmittance of the first display panel 111 is different for different color spectra. Therefore, the picture management module 130 can extract a first transmittance, a second transmittance, and a third transmittance corresponding to a red spectrum, a green spectrum, and a blue spectrum, respectively, from the transmittance spectrum data of the first picture setting signal 131, and adjust a first intensity parameter, a second intensity parameter, and a third intensity parameter corresponding to the red spectrum, the green spectrum, and the blue spectrum in the second picture setting signal 132 according to the first transmittance, the second transmittance, and the third transmittance. After receiving the second picture setting signal 132 fed by the picture management module 130, the panel control module 140 transmits the second control signal 142 to the second display panel 112 based on the second picture setting signal 132 to adjust the luminous intensity of the red light emitting element, the green light emitting element, and the blue light emitting element, thereby achieving picture color uniformity of the composite picture of the composite display 110.

[0078] In some embodiments, the picture management module 130 can compare the ambient brightness 1201 with a reference brightness 1301. When the ambient brightness 1201 is greater than the reference brightness 1301 (i.e. the ambient light is strong), the picture management module 130 sets the first display panel 111 in front to a reflection mode (Planar Mode) by using a first picture setting signal 131, and turns off the second display panel 112 by using a second picture setting signal 132. In the reflection mode, the cholesteric liquid crystal is in a planar state, and the first display panel 111 reflects the ambient light to project the first picture. On the contrary, when the ambient brightness 1201 is less than the reference brightness 1301 (i.e. the ambient light is weak), the picture management module 130 sets the first display panel 111 to a focal conic mode by using the first picture setting signal 131, and turns on the second display panel 112 by using the second picture setting signal 132. In the focal conic mode, the cholesteric liquid crystal is in a focal conic state, and thus the second picture projected by the second display panel 112 behind can penetrate the first display panel 111. Therefore, when the ambient light changes, the picture management module 130 can timely feed the first picture setting signal 131 and the second picture setting signal 132 to the panel control module 140, the panel control module 140 feeds the first control signal 141 and the second control signal 142 to the first display panel 111 and the second display panel 112 based on the first picture setting signal 131 and the second picture setting signal 132, respectively, and thus controls the composite display 110 to switch between different display modes, which not only provides high picture quality, but also achieves the effect of saving energy.

[0079] Regarding the picture content classification, in some embodiments, the picture management module 130 can obtain a picture content data 1101 from an external controller (not shown), and classify the picture content data 1101 into static picture data and dynamic picture data by using an artificial intelligence algorithm 1302. Further, the artificial intelligence algorithm 1302 classifies the picture content data 1101 into static picture data and dynamic picture data by identifying the difference between the static content and the dynamic content in the front and back frames. Then, the picture management module 130 can integrate the static picture data into the first picture setting signal 131, so that the first picture projected by the first display panel 111 presents a static picture. The picture management module 130 can integrate the dynamic picture data into the second picture setting signal 132, so that the second picture projected by the second display panel 112 presents a dynamic picture, wherein the dynamic picture is different from the static picture.

[0080] In some embodiments, the picture management module 130 can also utilize the artificial intelligence algorithm 1302 to differentiate the picture content data 1101 into first depth of field (DOF) picture data and second DOF picture data by different DOF sizes in the picture content data 1101. Then, the picture management module 130 can integrate the first DOF picture data into the first picture setting signal 131, so that the first display panel 111 projects a first picture presenting the first DOF picture. The picture management module 130 integrates the second DOF picture data into the second picture setting signal 132, so that the second display panel 112 projects a second picture presenting the second DOF picture, which is different from the first DOF picture. The method for controlling the compound display 110 will be described in detail below in conjunction with the accompanying drawings.

[0081] Please refer to Figure 1 , Figure 4 and Figure 5 , wherein Figure 4 a flowchart illustrating a method for controlling a compound display device according to a second embodiment of the present disclosure; and Figure 5 a flowchart illustrating a step of generating a first picture setting signal and a second picture setting signal in the method for controlling the compound display device of Figure 4 . As shown in Figure 1 and Figure 4 , the method 200 for controlling the compound display device can be automatically executed by the compound display device 100, and includes the following steps S01, S02 and S03.

[0082] Step S01 is to obtain the ambient brightness 1201 around the compound display 110 by the brightness obtaining module 120.

[0083] Step S02 is to generate the first picture setting signal 131 corresponding to the first display panel 111 according to the ambient brightness 1201 by the picture management module 130, and generate the second picture setting signal 132 corresponding to the second display panel 112 according to the first picture setting signal 131.

[0084] Step S03 is feeding a first control signal 141 to the first display panel 111 by the panel control module 140 based on the first picture setting signal 131, and controlling the first display panel 111 to project the first picture by the first control signal 141; and feeding a second control signal 142 to the second display panel 112 by the panel control module 140 based on the second picture setting signal 132, and controlling the second display panel 112 to project the second picture by the second control signal 142. In this way, the control method 200 of the composite display device of the present disclosure can drive one of the first display panel 111 and the second display panel 112 to display a picture alone, or can simultaneously drive the first display panel 111 and the second display panel 112 to display the first picture and the second picture respectively, so as to create a composite picture with multiple visual effects by overlapping the first picture on the second picture.

[0085] As shown in Figure 5 , step S02 can further include step S021, step S022 and step S023. Step S021 is generating a brightness judgment result by the picture management module 130 judging whether the ambient brightness 1201 is greater than the reference brightness 1301. When the brightness judgment result is "yes", step S022 is executed. In step S022, the panel control module 140 controls the first display panel 111 to operate in the reflection mode based on the first picture setting signal 131, and controls the second display panel 112 to be off based on the second picture setting signal 132. Conversely, when the brightness judgment result is "no", step S023 is executed. In step S023, the panel control module 140 controls the first display panel 111 to operate in the transmission mode based on the first picture setting signal 131, and controls the second display panel 112 to be on based on the second picture setting signal 132. Since the first display panel 111 has bistability (planar arrangement state and focal conic arrangement state), and does not need other backlights to improve brightness and display pictures in the reflection mode, only power is consumed when refreshing the screen (switching the cholesteric liquid crystal state), so the overall power consumption of the composite display 110 can be significantly reduced.

[0086] Please continue to refer to Figure 1 , Figure 6 and Figure 7 , wherein Figure 6 a schematic diagram of the transmission spectrum of the first display panel of the present disclosure is shown; and Figure 7 a schematic diagram of the spectrum-luminous intensity of the second display panel of the present disclosure is shown. As Figure 1 , Figure 6 and Figure 7As shown, step S02 can further include extracting, by the picture management module 130 from the penetration spectrum data 1311 of the first picture setting signal 131, first, second and third penetration rates respectively corresponding to the red spectrum RS, the green spectrum GS and the blue spectrum BS, and adjusting the first, second and third intensity parameters P1, P2 and P3 corresponding to the red spectrum RS, the green spectrum GS and the blue spectrum BS in the second picture setting signal 132 according to the first, second and third penetration rates.

[0087] In detail, when the second display panel 112 projects the second picture towards the first display panel 111, the penetration rate of the first display panel 111 is not 100%. In some frequency bands of visible light, such as the green spectrum GS (corresponding to the wavelength range 500nm~580nm) and the blue spectrum BS (corresponding to the wavelength range 400nm~500nm), the penetration rate is relatively low. At this time, the picture management module 130 executes a picture brightness correction program to correct the brightness of the second picture of the second display panel 112. In the picture correction program, the picture management module 130 adjusts the light intensity of the second display panel 112 for different color spectrums in proportion to the penetration rate changes (i.e. the first, second and third penetration rates) of the first display panel 111 for different color spectrums. For example, the penetration rate of the first display panel 111 for the red spectrum RS (corresponding to the wavelength range 580nm~680nm) is 3 times higher than that for the green spectrum GS and the blue spectrum BS (as shown in FIG. 1), so the picture management module 130 reduces the value of the first intensity parameter P1 corresponding to the red spectrum RS in the second picture setting signal 132, and the panel control module 140 transmits the second control signal 142 to the second display panel 112 based on the second picture setting signal 132 to reduce the light intensity of the red light emitting element to 1 / 3 of the original, thereby maintaining the picture color uniformity. Figure 6

[0088] Please refer to Figure 1 , Figure 8A , Figure 8B and Figure 8C , wherein Figure 8A a schematic diagram illustrating a static picture of the first display panel of the present disclosure; Figure 8B a schematic diagram illustrating a dynamic picture of the second display panel of the present disclosure; and Figure 8C a schematic diagram illustrating a composite picture of the composite display of the present disclosure. As Figure 1 , Figure 8A , Figure 8B and Figure 8C ​As shown, step S02 can further include obtaining the picture content data 1101 by the picture management module 130, and distinguishing the picture content data 1101 into static picture data and dynamic picture data; integrating the static picture data into the first picture setting signal 131 by the picture management module 130, so that the first picture presented by the first display panel 111 is a static picture M1; and integrating the dynamic picture data into the second picture setting signal 132 by the picture management module 130, so that the second picture presented by the second display panel 112 is a dynamic picture M2, wherein the dynamic picture M2 is different from the static picture M1, and overlaps with the static picture M1 to form a composite picture MC1. In detail, in order to control the overall energy consumption of the composite display 110, the picture management module 130 performs a picture classification program to distinguish the picture content (i.e. the picture content data 1101) to be presented into the static picture M1 and the dynamic picture M2 according to the difference between the static content and the dynamic content in the front and back frames. The static picture M1 represents that the picture does not need to be updated in a certain time, and is presented by the first display panel 111 located in the front. The first display panel 111 does not need to consume power to maintain the picture in the bistable state. The dynamic picture M2 represents that the picture update content is different each time, and the content that needs to be changed is limited to the minimum range, and is presented by the second display panel 112 located in the back. Therefore, the energy consumption can be reduced under the condition that the range of light sources is reduced, and even the heat energy is reduced, which is equivalent to indirectly prolonging the service life of the composite display 110 and reducing the operation cost.

[0089] Please refer to Figure 1 , Figure 9A , Figure 9B and Figure 9C wherein Figure 9A a schematic diagram illustrating a first depth of field picture of a first display panel of the present disclosure; Figure 9B a schematic diagram illustrating a second depth of field picture of a second display panel of the present disclosure; and Figure 9C a schematic diagram illustrating a composite picture of a composite display of the present disclosure. As Figure 1 , Figure 9A , Figure 9B and Figure 9CAs shown, step S02 can further include obtaining the picture content data 1101 by the picture management module 130, and distinguishing the picture content data 1101 into the first depth picture data and the second depth picture data; integrating the first depth picture data into the first picture setting signal 131 by the picture management module 130, so that the first picture presented by the first display panel 111 is a first depth picture M3; and integrating the second depth picture data into the second picture setting signal 132 by the picture management module 130, so that the second picture presented by the second display panel 112 is a second depth picture M4, wherein the second depth picture M4 is different from the first depth picture M3 and overlaps the first depth picture M3 to form a composite picture MC2. In detail, in order to make the composite display 110 present a stereoscopic effect with different depths, the picture management module 130 can distinguish the picture content (i.e. the picture content data 1101) to be presented into the first depth picture M3 and the second depth picture M4. The first depth picture M3 can be a main character part in the picture, and the second depth picture M4 can be a supporting character part in the picture. The purpose of depth classification is to highlight the main character to achieve the effect of attracting the attention. In other embodiments, the first display panel can also present the second depth picture, and the second display panel can also present the first depth picture. As to which of the first display panel and the second display panel presents the first depth picture and the other presents the second depth picture, it depends on the ambient brightness and the picture content properties. In this way, the control method 200 of the composite display device of the present disclosure achieves the functions of environment sensing, picture management and display control through the brightness obtaining module 120, the picture management module 130 and the panel control module 140 respectively, so that the composite display 110 can present various display effects and increase the readability of the picture.

[0090] In summary, the composite display device and the control method thereof provided by the present disclosure have the following advantages: first, the respective characteristics of the first display panel and the second display panel are utilized to achieve the effects of picture optimization and energy saving. Second, the picture color uniformity is maintained, because the composite display can simultaneously generate different images on different displays, the present disclosure can control the images to generate different effects, such as combining static and dynamic images or creating a stereoscopic effect with different depths. Third, the front first display panel and the rear second display panel are selected by the picture management to present the picture, whether separately or simultaneously, so that the composite display has various display modes.

[0091] Although the present disclosure has been disclosed with embodiments as above, it is not intended to limit the present disclosure, and any person skilled in the art can make various modifications and decorations without departing from the spirit and scope of the present disclosure, therefore the protection scope of the present disclosure shall be subject to the appended claims.

Claims

1. A composite display device, characterized by comprising: A composite display comprises: a first display panel having a first viewable area; and a second display panel stacked on the first display panel and having a second viewable area, wherein the second viewable area at least partially overlaps the first viewable area; a brightness obtaining module connected to the composite display and configured to obtain an ambient brightness around the composite display; a picture management module connected to the brightness obtaining module, the picture management module configured to generate a first picture setting signal corresponding to the first display panel according to the ambient brightness, and generate a second picture setting signal corresponding to the second display panel according to the first picture setting signal; and a panel control module connected to the picture management module and the composite display, the panel control module configured to control the first display panel to display a first picture in the first viewable area based on the first picture setting signal, and control the second display panel to display a second picture in the second viewable area based on the second picture setting signal; wherein the first picture and the second picture overlap to form a composite picture. The brightness obtaining module comprises a sensing sub-module configured to sense the ambient brightness around the composite display.

2. The composite display device according to claim 1, wherein The brightness obtaining module comprises a remote sub-module connected to a cloud server and configured to obtain the ambient brightness from the cloud server according to a location information of the composite display.

3. The composite display device according to claim 1, wherein The picture management module determines whether the ambient brightness is greater than a reference brightness to generate a brightness determination result.

4. The composite display device of claim 1, wherein When the brightness determination result is yes, the panel control module controls the first display panel to operate in a reflective mode based on the first picture setting signal, and controls the second display panel to be turned off based on the second picture setting signal. When the brightness determination result is no, the panel control module controls the first display panel to operate in a transmissive mode based on the first picture setting signal, and controls the second display panel to be turned on based on the second picture setting signal. The first picture setting signal comprises a transmissive spectrum data, the picture management module extracts a first transmittance, a second transmittance and a third transmittance corresponding to a red spectrum, a green spectrum and a blue spectrum respectively from the transmissive spectrum data, and adjusts a first intensity parameter, a second intensity parameter and a third intensity parameter corresponding to the red spectrum, the green spectrum and the blue spectrum in the second picture setting signal according to the first transmittance, the second transmittance and the third transmittance.

5. The compound display device according to claim 1, wherein The picture management module obtains a picture content data, and divides the picture content data into a static picture data and a dynamic picture data; 6. The composite display device of claim 1, wherein The picture management module integrates the static picture data to the first picture setting signal, so that the first picture displayed by the first display panel presents a static picture; and The picture management module integrates the dynamic picture data to the second picture setting signal, so that the second picture displayed by the second display panel presents a dynamic picture, wherein the dynamic picture is different from the static picture. ​ 7. The composite display device of claim 1, wherein The picture management module obtains a picture content data, and divides the picture content data into a first depth-of-field picture data and a second depth-of-field picture data; The picture management module integrates the first depth-of-field picture data into the first picture setting signal, so that the first picture projected by the first display panel presents a first depth-of-field picture; And The picture management module integrates the second depth-of-field picture data into the second picture setting signal, so that the second picture projected by the second display panel presents a second depth-of-field picture, wherein the second depth-of-field picture is different from the first depth-of-field picture.

8. The compound display device according to claim 1, wherein The composite display further comprises: An adhesive layer arranged between the first display panel and the second display panel.

9. The compound display device according to claim 1, wherein The first visual area at least partially overlaps the second visual area to form an overlapping area, and an area ratio of the overlapping area to an area of the first display panel is greater than or equal to 50%.

10. The compound display device according to claim 1, wherein The first display panel is a cholesteric liquid crystal display panel.

11. The compound display device according to claim 1, wherein The second display panel is a sub-millimeter light-emitting diode display panel, a micro light-emitting diode display panel, an organic light-emitting diode display panel, or a perovskite light-emitting diode display panel.

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