Display device

Abstract

The invention provides a display device. The display device comprises a substrate, a circuit layer, a display unit and a reflectivity control unit, the circuit layer is arranged on the substrate. The display unit is disposed on the substrate and electrically connected to the circuit layer. The reflectivity control unit is disposed on the substrate and electrically connected to the circuit layer. The display unit and the reflectivity control unit are arranged on the same side of the substrate.

Description

Technical Field

[0001] The present disclosure relates to an electronic device, and more particularly to a display device. Background Art

[0002] The development of displays is becoming more mature, but there is still room for improvement. For example, existing displays cannot provide multiple display modes (such as reflective display mode and outgoing light display mode) on the same side, and existing displays require external viewing angle optical films to achieve the viewing angle switching function. Summary of the invention

[0003] The present disclosure provides a display device, which can provide multiple display modes on the same side or can control the viewing angle without externally attaching a viewing angle optical film.

[0004] According to an embodiment of the present disclosure, a display device includes a substrate, a circuit layer, a display unit, and a reflectivity control unit. The circuit layer is disposed on the substrate. The display unit is disposed on the substrate and is electrically connected to the circuit layer. The reflectivity control unit is disposed on the substrate and is electrically connected to the circuit layer. The display unit and the reflectivity control unit are disposed on the same side of the substrate.

[0005] In order to make the above features and advantages of the present disclosure more obvious and understandable, embodiments are given below with reference to the accompanying drawings for detailed description as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1A as well as Figure 1B They are partial top view schematic diagrams of a display device operating in a first mode and a second mode according to an embodiment of the present disclosure;

[0007] Figure 2A as well as Figure 2B They correspond to Figure 1A as well as Figure 1B A schematic cross-sectional view of the middle section line I-I';

[0008] Figure 3A as well as Figure 3B are top view schematic diagrams of a first-type transistor and a second-type transistor electrically connected to a display unit and a reflectivity control unit respectively;

[0009] Figure 4 is a partial cross-sectional schematic diagram of a display device according to another embodiment of the present disclosure;

[0010] Figure 5 as well as Figure 6 They are partial top view diagrams of two display devices according to different embodiments of the present disclosure when operating in the third mode;

[0011] Figure 7as well as Figure 8 Partial cross-sectional schematic diagrams of two display devices operating in the fourth mode according to different embodiments of the present disclosure;

[0012] Figures 9 to 19 They are partial cross-sectional schematic diagrams of various display devices according to different embodiments of the present disclosure;

[0013] FIG. 20A to FIG. 20C They are Fig.19 Schematic diagrams of various parts of the reflectivity control unit from top view. DETAILED DESCRIPTION

[0014] Reference will now be made in detail to exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numerals are used in the drawings and the description to refer to the same or like parts.

[0015] Certain words are used throughout the present disclosure and in the appended claims to refer to specific components. It should be understood by those skilled in the art that electronic device manufacturers may refer to the same components by different names. This document does not intend to distinguish between components that have the same function but different names. In the following description and claims, the words "including" and "comprising" are open-ended words and should therefore be interpreted as "including but not limited to..."

[0016] Directional terms mentioned herein, such as "up", "down", "front", "back", "left", "right", etc., are only with reference to the directions of the accompanying drawings. Therefore, the directional terms used are for illustration and not for limiting the present disclosure. In the accompanying drawings, each figure shows the general characteristics of the methods, structures and / or materials used in a particular embodiment. However, these drawings should not be interpreted as defining or limiting the scope or nature covered by these embodiments. For example, for clarity, the relative size, thickness and position of each film layer, region and / or structure may be reduced or enlarged.

[0017] A structure (or layer, element, substrate) described in the present disclosure is located on / above another structure (or layer, element, substrate), which may refer to the two structures being adjacent and directly connected, or it may refer to the two structures being adjacent but not directly connected. Indirect connection means that there is at least one intermediate structure (or intermediate layer, intermediate element, intermediate substrate, intermediate interval) between the two structures, the lower surface of one structure is adjacent to or directly connected to the upper surface of the intermediate structure, and the upper surface of the other structure is adjacent to or directly connected to the lower surface of the intermediate structure. The intermediate structure can be composed of a single-layer or multi-layer physical structure or a non-physical structure, without limitation. In the present disclosure, when a certain structure is disposed "on" another structure, it may refer to that the certain structure is "directly" on the other structure, or that the certain structure is "indirectly" on the other structure, that is, at least one structure is sandwiched between the certain structure and the other structure.

[0018] The terms "approximately", "equal to", "equal to" or "same", "substantially" or "approximately" are generally interpreted as within 20% of a given value or range, or within 10%, 5%, 3%, 2%, 1% or 0.5% of a given value or range. In addition, the phrases "a range is from a first value to a second value", "a range is between a first value and a second value" indicate that the range includes the first value, the second value and other values ​​therebetween.

[0019] The ordinal numbers used in the specification and claims, such as "first", "second", etc., are used to modify the elements. They do not imply or represent any previous ordinal numbers of the element (or elements), nor do they represent the order of one element and another element, or the order of the manufacturing method. The use of these ordinal numbers is only used to make the element with a certain name clearly distinguishable from another element with the same name. The claims and the specification may not use the same words. Accordingly, the first component in the specification may be the second component in the claim.

[0020] The electrical connection or coupling described in the present disclosure may refer to direct connection or indirect connection. In the case of direct connection, the endpoints of the components on the two circuits are directly connected or connected to each other by a conductor segment, and in the case of indirect connection, there is a switch, diode, capacitor, inductor, resistor, other suitable components, or a combination of the above components between the endpoints of the components on the two circuits, but it is not limited to these.

[0021] In the present disclosure, the thickness, length and width can be measured by an optical microscope (OM), and the thickness or width can be measured by a cross-sectional image in an electron microscope, but it is not limited thereto. In addition, any two values ​​or directions used for comparison may have a certain error. In addition, the terms "equal", "equal", "same", "substantially" or "substantially" mentioned in the present disclosure generally represent falling within 10% of a given value or range. In addition, the term "a given range is from a first value to a second value", "a given range falls within the range from a first value to a second value" or "a given range is between a first value and a second value" means that the given range includes the first value, the second value and other values ​​therebetween. If the first direction is perpendicular to the second direction, the angle between the first direction and the second direction may be between 80 degrees and 100 degrees; if the first direction is parallel to the second direction, the angle between the first direction and the second direction may be between 0 degrees and 10 degrees.

[0022] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meanings as commonly understood by those skilled in the art to which the present disclosure belongs. It is understood that these terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning consistent with the background or context of the relevant technology and the present disclosure, and should not be interpreted in an idealized or overly formal manner unless specifically defined in the embodiments of the present disclosure.

[0023] In the present disclosure, the electronic device may include a display device, a backlight device, an antenna device, a sensing device or a splicing device, but is not limited thereto. The electronic device may be a bendable or flexible electronic device. The display device may be a non-self-luminous display device or a self-luminous display device. The display device may, for example, include liquid crystal, light-emitting diode, fluorescence, phosphor, quantum dot (QD), other suitable display media or a combination of the foregoing. The antenna device may, for example, include a frequency selective surface (FSS), a radio frequency filter, a polarizer, a resonator or an antenna, etc. The antenna may be a liquid crystal antenna or a non-liquid crystal antenna. The sensing device may be a sensing device for sensing capacitance, light, heat or ultrasound, but is not limited thereto. In the present disclosure, the electronic device may include electronic components, and the electronic components may include passive components and active components, such as capacitors, resistors, inductors, diodes, transistors, etc. The diode may include a light-emitting diode or a photodiode. The light emitting diode may include, for example, an organic light emitting diode (OLED), a sub-millimeter light emitting diode (mini LED), a micro LED or a quantum dot light emitting diode (quantum dotLED), but is not limited thereto. The splicing device may be, for example, a display splicing device or an antenna splicing device, but is not limited thereto. It should be noted that the electronic device may be any arrangement or combination of the foregoing, but is not limited thereto. In addition, the appearance of the electronic device may be rectangular, circular, polygonal, a shape with curved edges or other suitable shapes. The electronic device may have peripheral systems such as a drive system, a control system, a light source system, etc. to support a display device, an antenna device, a wearable device (such as glasses or a watch), a vehicle-mounted device (such as a car windshield or a trim panel that blends into the environment) or a splicing device.

[0024] It should be noted that the following embodiments may replace, reorganize, or mix features in several different embodiments to complete other embodiments without departing from the spirit of the present disclosure. Features between embodiments may be mixed and matched as long as they do not violate the spirit of the invention or conflict with each other.

[0025] Figure 1A as well as Figure 1B The diagrams are partial top views of a display device operating in a first mode and a second mode according to an embodiment of the present disclosure. Figure 2A as well as Figure 2B They correspond to Figure 1A as well as Figure 1B Schematic cross-section diagram along the middle section line II'.

[0026] Please refer to Figure 1A as well as Figure 2A The display device 1 may include a substrate 10, a circuit layer 11, a display unit 12, and a reflectivity control unit 13. The circuit layer 11 is disposed on the substrate 10. The display unit 12 is disposed on the substrate 10 and is electrically connected to the circuit layer 11. The reflectivity control unit 13 is disposed on the substrate 10 and is electrically connected to the circuit layer 11. The display unit 12 and the reflectivity control unit 13 are disposed on the same side of the substrate 10 (e.g., the upper side of the substrate 10).

[0027] Specifically, the substrate 10 may be a hard substrate or a flexible substrate. The material of the substrate 10 may include, for example, glass, quartz, ceramic, sapphire or plastic, but is not limited thereto. The plastic may include polycarbonate (PC), polyimide (PI), polypropylene (PP), polyethyleneterephthalate (PET), other suitable flexible materials or a combination of the foregoing materials, but is not limited thereto. In addition, the light transmittance of the substrate 10 is not limited, that is, the substrate 10 may be a light-transmitting substrate, a semi-transmitting substrate or an opaque substrate.

[0028] The circuit layer 11 is, for example, disposed between the display unit 12 and the substrate 10 and between the reflectivity control unit 13 and the substrate 10. In some embodiments, the circuit layer 11 may include a first-type transistor Ta electrically connected to the display unit 12 and a second-type transistor Tb electrically connected to the reflectivity control unit 13. The first-type transistor Ta, for example, includes a gate GEa, a semiconductor pattern CHa, a source SEa, and a drain DEa, and the second-type transistor Tb, for example, includes a gate GEb, a semiconductor pattern CHb, a source SEb, and a drain DEb, but is not limited thereto.

[0029] The materials of the gate GEa, the gate Geb, the source electrode SEa, the source electrode SEb, the drain electrode DEa and the drain electrode DEb may include metal or metal stacks, such as aluminum, molybdenum or titanium / aluminum / titanium, but are not limited thereto. The materials of the semiconductor pattern CHa and the semiconductor pattern CHb include, for example, silicon semiconductor, oxide semiconductor or other suitable semiconductor materials. Silicon semiconductor includes, for example, amorphous silicon or polycrystalline silicon. Oxide semiconductor includes, for example, indium tin oxide (ITO), indium zinc oxide (IZO), indium gallium oxide (IGO) or indium gallium zinc oxide (IGZO), but are not limited thereto.

[0030] The materials of the semiconductor pattern CHa and the semiconductor pattern CHb may be different. Specifically, the material of the semiconductor pattern can be selected according to the actual application (for example, based on the driving current size, driving voltage size, driving frequency size or voltage stability considerations). For example, in the application of high driving current, the material of the semiconductor pattern can be silicon semiconductor. On the other hand, in the application of high driving voltage and / or high stability (low leakage), the material of the semiconductor pattern can be oxide semiconductor, but not limited to this. In some embodiments, the materials of the semiconductor pattern CHa and the semiconductor pattern CHb can be silicon semiconductor and oxide semiconductor, respectively, that is, the first-type transistor Ta includes a silicon semiconductor, and the second-type transistor Tb includes an oxide semiconductor, but not limited to this.

[0031] According to different requirements, the circuit layer 11 may also include other film layers and / or components. Figure 2A For example, the circuit layer 11 may also include multiple dielectric layers (such as dielectric layer INa, dielectric layer INb, dielectric layer INc and dielectric layer INd), multiple storage capacitors (storage capacitor Ca and storage capacitor Cb) and multiple electrodes (such as electrode E1, electrode E2 and electrode E3).

[0032] The materials of the dielectric layer INa, the dielectric layer INb, the dielectric layer INc, and the dielectric layer INd include, for example, organic insulating materials, inorganic insulating materials, or a combination thereof. The organic insulating material includes, for example, polymethyl methacrylate (PMMA), epoxy resin, acrylic-based resin, silicone, polyimide polymer, or a combination thereof, but is not limited thereto. The inorganic insulating material includes, for example, silicon oxide, silicon nitride, or silicon oxynitride, but is not limited thereto. In some embodiments, the materials of the dielectric layer INa, the dielectric layer INb, and the dielectric layer INc are, for example, selected from inorganic insulating materials, and the material of the dielectric layer INd is, for example, selected from organic insulating materials, but is not limited thereto.

[0033] The storage capacitor Ca is composed of, for example, a lower electrode BEa, a dielectric layer INc, and an upper electrode TEa, and the storage capacitor Cb is composed of, for example, a lower electrode BEb, a dielectric layer INc, and an upper electrode TEb. The materials of the lower electrode BEa, the lower electrode BEb, the upper electrode TEa, and the upper electrode TEb may include metal or metal stacks, such as aluminum, molybdenum, or titanium / aluminum / titanium, but are not limited thereto.

[0034] The materials of the electrode E1, the electrode E2 and the electrode E3 may include a transparent conductive material or an opaque conductive material. The transparent conductive material includes, for example, metal oxide, graphene, other suitable transparent conductive materials or a combination thereof, but is not limited thereto. The metal oxide includes, for example, indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, indium germanium zinc oxide or other metal oxides. The opaque conductive material includes, for example, a metal, an alloy or a combination thereof, but is not limited thereto.

[0035] like Figure 2A As shown, a dielectric layer INa may be disposed on the substrate 10. A semiconductor pattern CHa may be disposed on the dielectric layer INa. A dielectric layer INb may be disposed on the semiconductor pattern CHa and the dielectric layer INa. A semiconductor pattern CHb, a gate GEa, a lower electrode BEa, and a lower electrode BEb may be disposed on the dielectric layer INb, wherein the gate GEa overlaps the semiconductor pattern CHa in a direction D3. A dielectric layer INc may be disposed on the dielectric layer INb, the semiconductor pattern CHb, the gate GEa, the lower electrode BEa, and the lower electrode BEb. The gate GEb, the source SEa, the drain DEa, the source SEb, the drain DEb, the upper electrode TEa, and the upper electrode TEb may be disposed on the dielectric layer INc, wherein the gate GEb overlaps the semiconductor pattern CHb in the direction D3, each of the source SEa and the drain DEa penetrates the dielectric layer INb and the dielectric layer INc and is electrically connected to the semiconductor pattern CHa, each of the source SEb and the drain DEb penetrates the dielectric layer INc and is electrically connected to the semiconductor pattern CHb, the upper electrode TEa overlaps the lower electrode BEa in the direction D3, and the upper electrode TEb overlaps the lower electrode BEb in the direction D3. The dielectric layer INd may be disposed on the dielectric layer INc, the gate GEb, the source SEa, the drain DEa, the source SEb, the drain DEb, the upper electrode TEa, and the upper electrode TEb. The electrode E1 , the electrode E2 , and the electrode E3 may be disposed on the dielectric layer INd, wherein the electrode E1 penetrates the dielectric layer INd and is electrically connected to the drain electrode DEa, and the electrode E3 penetrates the dielectric layer INd and is electrically connected to the drain electrode DEb.

[0036] The display unit 12 and the reflectivity control unit 13 are jointly arranged on the circuit layer 11, and the display unit 12 and the reflectivity control unit 13 are used to display the first image and the second image respectively in the same direction (such as direction D3). In other words, the user can see the first image displayed by the display unit 12 and the second image displayed by the reflectivity control unit 13 from the same side of the display device 1. Here, the first image and the second image are used to refer to the image displayed by the display unit 12 and the image displayed by the reflectivity control unit 13, respectively. In some embodiments, the first image and the second image may display the same or different patterns and / or texts. In some embodiments, the first image and the second image may have different display effects (for example, different colors or different resolutions, etc.). In some embodiments, the first image and the second image may be displayed simultaneously or at different times.

[0037] In detail, the display unit 12 and the reflectivity control unit 13 can display images in different ways. For example, the display unit 12 can display the first image by emitting light, and the reflectivity control unit 13 can display the second image by reflecting or absorbing incident light from the outside. Under this architecture, the color of the first image can be determined by the light-emitting element, color conversion element and / or filter element in the display unit 12. On the other hand, the color of the second image can be determined by the color type of the light-absorbing particles and the light-reflecting particles in the reflectivity control unit 13.

[0038] by Figures 1A to 2B For example, the display unit 12 may include a plurality of light emitting elements (such as light emitting element 120a, light emitting element 120b, light emitting element 120c and light emitting element 120d) to display an image by emitting light. The plurality of light emitting elements may include, for example, a plurality of light emitting diodes (LEDs), a plurality of organic light emitting diodes (OLEDs), a plurality of sub-millimeter light emitting diodes (mini LEDs), a plurality of micro LEDs or a plurality of quantum dot LEDs (quantum dot LEDs), but are not limited thereto. The plurality of light emitting elements may be arranged in an array in directions D1 and D2 to display a first image. In some embodiments, such as Figure 1A As shown, the plurality of light emitting elements may include a plurality of light emitting elements of different colors. For example, the light emitting element 120a, the light emitting element 120b, the light emitting element 120c and the light emitting element 120d may be a red light emitting element, a green light emitting element, a blue light emitting element and a yellow light emitting element, respectively, but the present invention is not limited thereto. By providing light emitting elements of multiple colors, the first image displayed by the display unit 12 may be a color image.

[0039] The reflectivity control unit 13 may include multiple reflectivity control elements (such as reflectivity control element 130a, reflectivity control element 130b, reflectivity control element 130c and reflectivity control element 130d), wherein each of the multiple reflectivity control elements may include multiple electrophoretic particles to display images by reflecting or absorbing incident light from the outside.

[0040] The color of the electrophoretic particles can be selected according to actual needs. Black electrophoretic particles can be used to absorb various colors of light. When a plurality of black electrophoretic particles are distributed on the display side of the display device 1, the reflectivity control element presents a black image. White electrophoretic particles can be used to reflect various colors of light. When a plurality of white electrophoretic particles are distributed on the display side of the display device 1, the reflectivity control element presents an image of the color of the incident light, for example, when the incident light is sunlight or white light, the reflectivity control element presents a white image. Colored electrophoretic particles can be used to reflect corresponding color light, for example, red electrophoretic particles can be used to reflect red light, green electrophoretic particles can be used to reflect green light, blue electrophoretic particles can be used to reflect blue light, and so on. When a plurality of colored electrophoretic particles are distributed on the display side of the display device 1, the reflectivity control element presents the corresponding color, for example, when a plurality of red electrophoretic particles are distributed on the display side of the display device 1, the reflectivity control element presents red, and so on.

[0041] A plurality of reflectivity control elements may be arranged in an array in the direction D1 and the direction D2 to display a second image. In some embodiments, each of the plurality of reflectivity control elements may include a plurality of black electrophoretic particles and a plurality of white electrophoretic particles, so that the second image displayed by the reflectivity control unit 13 may be a black and white image. In some embodiments, each of the plurality of reflectivity control elements may include a plurality of black electrophoretic particles and a plurality of color electrophoretic particles, so that the second image may be a color image. For example, the reflectivity control element 130a may include a plurality of black electrophoretic particles and a plurality of red electrophoretic particles, the reflectivity control element 130b may include a plurality of black electrophoretic particles and a plurality of green electrophoretic particles, the reflectivity control element 130c may include a plurality of black electrophoretic particles and a plurality of blue electrophoretic particles, and the reflectivity control element 130d may include a plurality of black electrophoretic particles and a plurality of yellow electrophoretic particles, but is not limited thereto.

[0042] by Figure 2AFor example, each of the multiple reflectivity control elements may include multiple electrophoretic particles 131, multiple electrophoretic particles 132 and a solution 133 (such as a transparent solution), wherein the multiple electrophoretic particles 131 and the multiple electrophoretic particles 132 are suspended in the solution 133. The multiple electrophoretic particles 131 and the multiple electrophoretic particles 132 carry opposite charges. For example, the multiple electrophoretic particles 131 are multiple black electrophoretic particles and are negatively charged, while the multiple electrophoretic particles 132 are multiple white electrophoretic particles or multiple color electrophoretic particles and are positively charged. Under the action of an external electric field, the multiple negatively charged electrophoretic particles 131 move toward the positively charged electrode, and the multiple positively charged electrophoretic particles 132 move toward the negatively charged electrode, so that the multiple electrophoretic particles 131 and the multiple electrophoretic particles 132 are respectively distributed in different areas of the reflectivity control element. By changing the voltage applied to the electrodes adjacent to the reflectivity control element, the distribution of the electrophoretic particles (including the electrophoretic particles 131 and the electrophoretic particles 132 ) can be controlled, thereby controlling the color (such as black, white or other colors) presented by the reflectivity control element.

[0043] In some embodiments, in top view (see Figure 1A or Figure 1B ), at least one of the plurality of light-emitting elements may be surrounded by one of the plurality of reflectivity control elements. For example, light-emitting element 120a may be surrounded by reflectivity control element 130a, light-emitting element 120b may be surrounded by reflectivity control element 130b, light-emitting element 120c may be surrounded by reflectivity control element 130c, and light-emitting element 120d may be surrounded by reflectivity control element 130d. In this article, a first element being surrounded by a second element means that the second element is located around the first element, wherein the second element may surround the first element continuously or discontinuously. In some embodiments, the resolution of the plurality of light-emitting elements may be greater than or equal to the resolution of the plurality of reflectivity control elements. Resolution is defined as the number of elements per unit area. In some embodiments, in a top view, the area occupied by the display unit 12 may be smaller than the area occupied by the reflectivity control unit 13.

[0044] According to different requirements, the display device 1 may further include other elements or film layers. Figure 2A For example, the display device 1 may further include a spacer layer (or pixel definition layer) 14, an intermediate layer 15, a common electrode 16 and an encapsulation layer 17, but is not limited thereto. The spacer layer 14 is disposed on the dielectric layer INd and may expose the electrode E1, the electrode E2 and the electrode E3, so that the light emitting element ( Figure 2A The schematic diagram shows that the light emitting element 120a) can be electrically connected to the circuit layer 11 through the electrode E1 and the electrode E2, and is disposed on the reflectivity control element ( Figure 2AThe electrode E3 under the reflectivity control element 130a) is schematically shown to be electrically connected to the circuit layer 11. The material of the spacer layer includes, for example, an opaque organic polymer material to reduce interference and / or light mixing between adjacent light-emitting elements. The opaque organic polymer material can be a white, gray or black organic polymer material, such as a black matrix, but is not limited thereto. In some embodiments, the material of the spacer layer can include a transparent organic polymer material. The transparent organic polymer material can include, but is not limited thereto, a resin.

[0045] The intermediary layer 15 is disposed on the spacer layer 14, the plurality of light emitting elements, the electrode E1, and the electrode E2. According to different requirements, the intermediary layer 15 can be a fill layer, an optical layer, or a lens layer, but is not limited thereto. The material of the intermediary layer 15 includes, for example, optical clear adhesive (OCA) or optical clear resin (OCR), but is not limited thereto.

[0046] The common electrode 16 is arranged on the reflectivity control element ( Figure 2A Schematically shows the reflectivity control element 130a), and the reflectivity control element ( Figure 2A The reflectivity control element 130a is schematically shown to be located between the electrode E3 and the common electrode 16. The material of the common electrode 16 includes, for example, a transparent conductive material such as indium tin oxide (ITO), indium zinc oxide (IZO), indium gallium zinc oxide (IGZO), or magnesium silver alloy (MgAg alloy), but is not limited thereto.

[0047] The encapsulation layer 17 is disposed on the common electrode 16 and the intermediate layer 15. The material of the encapsulation layer 17 includes, for example, silicon oxide, silicon nitride, silicon oxynitride or acrylic polymer materials, but is not limited thereto.

[0048] The display device 1 can be operated in a first mode (see Figure 1A as well as Figure 2A ) and the second mode (see Figure 1B as well as Figure 2B ), when the display device 1 operates in the first mode, the display unit 12 displays the first image, and when the display device 1 operates in the second mode, the reflectivity control unit 13 displays the second image.

[0049] In detail, Figure 1A as well as Figure 2AAs shown, when the display device 1 operates in the first mode, at least one of the plurality of light-emitting elements in the display unit 12 can emit light L, and the reflectivity control unit 13 can absorb ambient light to display a first image. For example, a voltage difference between the electrodes E1 and E2 can be provided to enable at least one of the plurality of light-emitting elements to emit light L. In addition, by applying a positive voltage to the common electrode 16 and applying a negative voltage to the electrode E3, the principle of positive and negative attraction can be utilized to enable a plurality of electrophoretic particles 131 (e.g., a plurality of negatively charged black electrophoretic particles) to be distributed on the display side of the display device 1 (the same side as the light-emitting side of the light-emitting element, such as the upper side of the reflectivity control element 130a), and a plurality of electrophoretic particles 132 (e.g., a plurality of positively charged white electrophoretic particles or a plurality of colored electrophoretic particles) to be distributed on the non-display side of the display device 1 (the side opposite to the light-emitting side of the light-emitting element, such as the lower side of the reflectivity control element 130a). By distributing a plurality of negatively charged black electrophoretic particles on the display side of the display device 1, the plurality of black electrophoretic particles can absorb ambient light and help reduce the interference of the reflection of ambient light on the displayed image, and the plurality of black electrophoretic particles can also absorb the reflection of the ambient light from the light emitting element ( Figure 2A The schematic diagram shows a light emitting element 120a) with a large angle of light, which helps to provide a limited viewing angle or anti-peeping effect. The electrophoretic particles and the light emitting elements may have different driving voltages and / or driving frequencies. For example, the driving voltage of the electrophoretic particles may be 15V to 70V, and the driving voltage of the light emitting element may be 3V to 10V; the driving frequency of the electrophoretic particles may be 50Hz, and the driving frequency of the light emitting element may be 60Hz to 240Hz, but are not limited thereto. In addition, the driving waveforms of the electrophoretic particles and the light emitting elements may not be limited. For example, the driving waveforms of the electrophoretic particles and the light emitting elements may be square waves, sine waves, or pulse waves, but are not limited thereto.

[0050] On the other hand, Figure 1B as well as Figure 2B As shown, when the display device 1 operates in the second mode, the display unit 12 can be turned off, and at least a portion of the plurality of reflectivity control elements can be made to reflect light to display a second image. Figure 1B as well as Figure 2BAs shown, when the display device 1 operates in the second mode, a portion of the multiple reflectivity control elements (such as the reflectivity control element 130a and the reflectivity control element 130d) can be made to reflect light, and another portion of the multiple reflectivity control elements (such as the reflectivity control element 130b and the reflectivity control element 130c) can be made to absorb ambient light. For example, the voltage difference between the electrode E1 and the electrode E2 can be not provided so that the multiple light-emitting elements do not emit light. In addition, by applying a negative voltage to the common electrode 16 and applying a positive voltage to the electrode E3, the principle of positive and negative attraction can be utilized to make the multiple electrophoretic particles 132 (such as a plurality of positively charged white electrophoretic particles or a plurality of colored electrophoretic particles) distributed on the display side of the display device 1 (the same side as the light-emitting side of the light-emitting element, such as the upper side of the reflectivity control element 130a), and the multiple electrophoretic particles 131 (such as a plurality of negatively charged black electrophoretic particles) distributed on the non-display side of the display device 1 (the side opposite to the light-emitting side of the light-emitting element, such as the lower side of the reflectivity control element 130a). The reflectivity control element can present a corresponding color by distributing a plurality of positively charged white electrophoretic particles or a plurality of colored electrophoretic particles on the display side of the display device 1. In addition, by controlling the color (such as black, white or other colors) displayed by each of the plurality of reflectivity control elements distributed in an array, the display device 1 can provide corresponding information such as images or texts.

[0051] by Figure 1B For example, the distribution of the multiple electrophoretic particles in the reflectivity control element 130a and the reflectivity control element 130d can refer to Figure 2B , and the distribution of the multiple electrophoretic particles in the reflectivity control element 130b and the reflectivity control element 130c can refer to Figure 2A .like Figure 1B In each reflectivity control element, the plurality of electrophoretic particles 131 are all black electrophoretic particles and the plurality of electrophoretic particles 132 are all white electrophoretic particles. When the display device 1 operates in the second mode, the reflectivity control unit 13 displays a black and white image. Figure 1B In each reflectivity control element, the multiple electrophoretic particles 131 are all black electrophoretic particles and the multiple electrophoretic particles 132 are all color electrophoretic particles. Then, when the display device 1 operates in the second mode, the reflectivity control unit 13 displays a color image. For example, when the display device 1 operates in the second mode, the first part of the multiple reflectivity control elements (such as reflectivity control element 130a) reflects the first light (such as red light), and the second part of the multiple reflectivity control elements (such as reflectivity control element 130d) reflects the second light (such as yellow light), and the colors of the first light and the second light are different. When the display device 1 operates in the second mode, since the reflectivity control unit has the effect of displaying static images without consuming energy, it is suitable for displaying static images, can be used as a decoration in the interior space, and can display different static images according to needs.

[0052] In some embodiments, the channel width and / or channel length of the transistor (such as the first-type transistor Ta, the second-type transistor Tb) can be determined according to the required power. For example, the power (such as the driving voltage) required by the electrophoretic particles is greater than the power required by the light-emitting element, so the power of the second-type transistor Tb can be increased by increasing the channel width of the second-type transistor Tb and / or reducing the channel length of the second-type transistor Tb. Figure 3A as well as Figure 3B The top view schematic diagrams of the first type transistor and the second type transistor are electrically connected to the display unit and the reflectivity control unit respectively. Figure 3A as well as Figure 3B , the first-type transistor Ta has a first channel width Wa and a first channel length La, the second-type transistor Tb has a second channel width Wb and a second channel length Lb, and the ratio of the first channel width Wa to the first channel length La (i.e., Wa / La) is smaller than the ratio of the second channel width Wb to the second channel length Lb (i.e., Wb / Lb). For example, the second channel width Wb may be larger than the first channel width Wa, and the second channel length Lb may be smaller than or equal to the first channel length La.

[0053] In some embodiments, the number of transistors and / or the number of storage capacitors corresponding to the display unit 12 and the reflectivity control unit 13 can also be changed according to different needs. For example, the number of transistors corresponding to the display unit 12 may be greater than or equal to the number of transistors corresponding to the reflectivity control unit 13, and / or the number of storage capacitors corresponding to the display unit 12 may be greater than the number of storage capacitors corresponding to the reflectivity control unit 13, but is not limited thereto. In some embodiments, each light-emitting element may correspond to six transistors and two storage capacitors, seven transistors and two storage capacitors, or other configurations. In some embodiments, each reflectivity control element may correspond to one transistor and zero or one storage capacitor, three transistors and zero or one storage capacitor, or other configurations.

[0054] Figure 4 is a partial cross-sectional schematic diagram of a display device according to another embodiment of the present disclosure. Figure 4In the display device 1A, the circuit layer 11A may further include a second-type transistor Tc electrically connected to the display unit 12, wherein the second-type transistor Tc includes, for example, a gate GEc, a semiconductor pattern CHc, a source SEc, and a drain DEc. The second-type transistor Tc may be made of the same material as the semiconductor pattern CHb of the second-type transistor Tb, such as an oxide semiconductor, to improve power saving. The arrangement relationship of the gate GEc, the semiconductor pattern CHc, the source SEc, and the drain DEc in the second-type transistor Tc relative to other film layers may refer to the relevant description of the second-type transistor Tb, and will not be repeated here.

[0055] In some embodiments, in addition to the first mode and the second mode, the display device may further include a third mode, and when the display device operates in the third mode, the display unit and the reflectivity control unit display different images. Figure 5 as well as Figure 6 They are partial top view diagrams of two display devices operating in the third mode according to different embodiments of the present disclosure.

[0056] Please refer to Figure 5 In the display device 1B, the display unit 12B includes, for example, a plurality of light emitting elements 120a, a plurality of light emitting elements 120b, and a plurality of light emitting elements 120c, and the reflectivity control unit 13B includes, for example, a plurality of reflectivity control elements 130a (one is schematically shown), a plurality of reflectivity control elements 130b (one is schematically shown), and a plurality of reflectivity control elements 130c (one is schematically shown). The plurality of light emitting elements 120a, the plurality of light emitting elements 120b, and the plurality of light emitting elements 120c may be a plurality of red light emitting elements, a plurality of green light emitting elements, and a plurality of blue light emitting elements, respectively, but are not limited thereto. Each of the multiple reflectivity control elements may include multiple black electrophoretic particles and multiple white electrophoretic particles; or, each of the multiple reflectivity control elements may include multiple black electrophoretic particles and multiple color electrophoretic particles, for example, reflectivity control element 130a may include multiple black electrophoretic particles and multiple red electrophoretic particles, reflectivity control element 130b may include multiple black electrophoretic particles and multiple green electrophoretic particles, and reflectivity control element 130c may include multiple black electrophoretic particles and multiple blue electrophoretic particles, but is not limited to this.

[0057] Each reflectivity control element 130a, for example, surrounds a plurality of light-emitting elements 120a arranged in the direction D2. Each reflectivity control element 130b, for example, surrounds a plurality of light-emitting elements 120b arranged in the direction D2. Each reflectivity control element 130c, for example, surrounds a plurality of light-emitting elements 120c arranged in the direction D2. When the display device 1B operates in the third mode, at least some of the light-emitting elements in the display unit 12B may be illuminated, and at least some of the reflectivity control elements in the reflectivity control unit 13B (such as the reflectivity control element 130a and the reflectivity control element 130c) may reflect light, such as white light or light of other colors, depending on the electrophoretic particles (such as Figure 2B The color of the electrophoretic particles 132 is determined.

[0058] Please refer to Figure 6 In the display device 1C, the display unit 12B includes, for example, a plurality of light emitting elements 120a, a plurality of light emitting elements 120b, and a plurality of light emitting elements 120c, and the reflectivity control unit 13 includes, for example, a plurality of reflectivity control elements 130a (one is schematically shown), a plurality of reflectivity control elements 130b (one is schematically shown), a plurality of reflectivity control elements 130c (one is schematically shown), and a plurality of reflectivity control elements 130d. The plurality of light emitting elements 120a, the plurality of light emitting elements 120b, and the plurality of light emitting elements 120c may be a plurality of red light emitting elements, a plurality of green light emitting elements, and a plurality of blue light emitting elements, respectively, but are not limited thereto. Each of the multiple reflectivity control elements may include multiple black electrophoretic particles and multiple white electrophoretic particles; or, each of the multiple reflectivity control elements may include multiple black electrophoretic particles and multiple color electrophoretic particles, for example, the reflectivity control element 130a may include multiple black electrophoretic particles and multiple red electrophoretic particles, the reflectivity control element 130b may include multiple black electrophoretic particles and multiple green electrophoretic particles, the reflectivity control element 130c may include multiple black electrophoretic particles and multiple blue electrophoretic particles, and the reflectivity control element 130d may include multiple black electrophoretic particles and multiple yellow electrophoretic particles, but not limited thereto. When the display device operates in the third mode, one of the actual use scenarios is that the reflectivity control unit 13 can be used to display a static image, such as an ink painting background, and the display unit 12B can be used to display a dynamic image, such as a flowing river or a moving boat or a flying bird. In this use scenario, since the reflectivity control unit 13 does not consume energy when displaying a static image, and the display unit 12B only displays a subtle dynamic image, the effect of saving power consumption can be achieved.

[0059] Each reflectivity control element 130a (or reflectivity control element 130c) is, for example, located between two light-emitting elements 120a arranged in direction D2 and between two light-emitting elements 120b arranged in direction D2. Each reflectivity control element 130b (or reflectivity control element 130d) is, for example, located between two light-emitting elements 120b arranged in direction D2 and between two light-emitting elements 120c arranged in direction D2. When the display device 1C operates in the third mode, at least some of the light-emitting elements in the display unit 12B can be illuminated, and at least some of the reflectivity control elements in the reflectivity control unit 13 (such as the reflectivity control element 130a and the reflectivity control element 130d) can reflect light, such as white light or light of other colors, depending on the electrophoretic particles (such as Figure 2B The color of the electrophoretic particles 132 is determined.

[0060] In some embodiments, in addition to the first mode, the second mode and the third mode, the display device may further include a fourth mode. When the display device operates in the fourth mode, the display unit displays a third image and the reflectivity control unit reflects light from the display unit. Figure 7 as well as Figure 8 Partial cross-sectional diagrams of two display devices operating in the fourth mode according to different embodiments of the present disclosure are shown respectively.

[0061] Please refer to Figure 7 In the display device 1D, the circuit layer 11D further includes an electrode E4. The electrode E4 is disposed on the dielectric layer INd and is electrically insulated from the electrode E3, wherein the electrode E4 and the common electrode 16E are respectively disposed on the reflectivity control element ( Figure 7 The two opposite sides (such as the upper and lower sides) of the reflectivity control element 130a are schematically shown. The material of the electrode E4 can refer to the material of the electrode E3, and will not be repeated here. In addition, the plurality of electrophoretic particles 131 and the plurality of electrophoretic particles 132 are, for example, a plurality of black electrophoretic particles and a plurality of white electrophoretic particles, respectively.

[0062] When the display device 1D operates in the fourth mode, at least one of the multiple light-emitting elements can emit light L. In addition, by applying a positive voltage to the electrode E3 and a negative voltage to the common electrode 16E and the electrode E4, the white electrophoretic particles can be distributed on the display side of the display device 1D (such as the upper side of the reflectivity control element 130a) and the side wall of the adjacent light-emitting element (such as the light-emitting element 120a) of the reflectivity control element by utilizing the principle of positive and negative attraction, so as to reflect the large-angle light from the light-emitting element, thereby achieving the effect of collimating the light (or limiting the viewing angle or preventing peeping) or improving the light utilization rate. In some embodiments, the thickness of the side wall of the reflectivity control element can also be increased (for example, by thickening the reflectivity control element 130a), so that the light L incident on the side wall is reflected by the multiple white electrophoretic particles distributed on the side wall of the adjacent light-emitting element (such as the light-emitting element 120a) to further limit the viewing angle.

[0063] Please refer to Figure 8 In the display device 1E, the common electrode 16E extends from the top surface of the reflectivity control element 130a to the sidewall of the light emitting element (such as the light emitting element 120a) adjacent to the reflectivity control element 130a. In addition, the plurality of electrophoretic particles 131 and the plurality of electrophoretic particles 132 are, for example, a plurality of black electrophoretic particles and a plurality of white electrophoretic particles, respectively.

[0064] When the display device 1E operates in the fourth mode, at least one of the multiple light-emitting elements can emit light L. In addition, by applying a positive voltage to the electrode E3 and a negative voltage to the common electrode 16E, the white electrophoretic particles can be distributed on the display side of the display device 1E (such as the upper side of the reflectivity control element 130a) and the side wall of the adjacent light-emitting element (such as the light-emitting element 120a) of the reflectivity control element by utilizing the principle of positive and negative attraction, so as to reflect the large-angle light from the light-emitting element, thereby achieving the effect of collimating the light (or limiting the viewing angle or preventing peeping) or improving the light utilization rate. In some embodiments, the thickness of the side wall of the reflectivity control element can also be increased (for example, by thickening the reflectivity control element 130a), so that the light L incident on the side wall is reflected by the multiple white electrophoretic particles distributed on the side wall of the adjacent light-emitting element (such as the light-emitting element 120a) to further narrow the viewing angle.

[0065] In some embodiments, the height of the light emitting element and / or the electrodes driving the electrophoretic particles may be adjusted according to the viewing angle specification of the display unit 12 . Figures 9 to 14 They are partial cross-sectional schematic diagrams of various display devices according to different embodiments of the present disclosure. Figures 9 to 14 In the figure, for the convenience of explanation, only the substrate, a light-emitting element of the display unit, a reflectivity control element of the reflectivity control unit, and a plurality of electrodes for driving the electrophoretic particles are schematically shown, and other elements are omitted.

[0066] Please refer to Fig. 9In the display device 1F, the height of the light emitting element can be adjusted according to the viewing angle specification of the display unit 12. For example, the height of the light emitting element 120 can be changed by changing the number and / or thickness of the film layers in the circuit layer (not shown) between the light emitting element 120 and the substrate 10, but the invention is not limited thereto.

[0067] In a mode (such as the first mode) in which black electrophoretic particles (such as electrophoretic particles 131) are distributed at the top of the reflectivity control element 130, and white electrophoretic particles or color electrophoretic particles (such as electrophoretic particles 132) are distributed at the bottom of the reflectivity control element 130, the smaller the height of the light-emitting element 120 or the closer the light-emitting element 120 is to the substrate 10, the easier it is for the large-angle light L from the light-emitting element 120 to be incident on the black electrophoretic particles and absorbed by the black electrophoretic particles. Therefore, the smaller the height of the light-emitting element 120 or the closer the light-emitting element 120 is to the substrate 10, the narrower the viewing angle of the display unit 12. In other words, if a narrower viewing angle is desired (such as for anti-peeping requirements), the light-emitting element 120 can be disposed adjacent to the bottom of the reflectivity control unit 13. In this way, the black electrophoretic particles (such as electrophoretic particles 131) can absorb the large-angle light L from the light-emitting element 120 to achieve the effect of limiting the viewing angle. On the contrary, if a wider viewing angle is desired (such as a wide viewing angle requirement), the light emitting element 120 may be disposed adjacent to the top of the reflectivity control unit 13 (such as Fig. 9 The position shown by the dotted box in the middle) is used to reduce the proportion of the large-angle light L from the light-emitting element 120 that is incident on the black electrophoretic particles and absorbed by the black electrophoretic particles.

[0068] Please refer to Fig.10 In the display device 1G, the height of the light emitting element 120 can be adjusted according to the viewing angle specification of the display unit 12 and an electrode for driving the electrophoretic particles can be additionally provided. For example, in addition to the electrode E3 and the common electrode 16, the display device 1G can also include an electrode E5 and an electrode E6, wherein the electrode E5 is provided on the surface of the reflectivity control element 130 away from the light emitting element 120, and the electrode E6 is provided on the surface of the reflectivity control element 130 facing the light emitting element 120. The materials of the electrodes E5 and E6 can be the same as those of the electrode E3, which will not be repeated here.

[0069] By applying a positive voltage to the common electrode 16 and the electrode E6 and applying a negative voltage to the electrode E3 and the electrode E5, a plurality of electrophoretic particles 131 (e.g., a plurality of negatively charged black electrophoretic particles) can be distributed on the top of the reflectivity control element 130 and the sidewall of the reflectivity control element 130 adjacent to the light-emitting element 120, and a plurality of electrophoretic particles 132 (e.g., positively charged white electrophoretic particles or color electrophoretic particles) can be distributed on the bottom of the reflectivity control element 130. The absorption of large-angle light L from the light-emitting element 120 by a plurality of black electrophoretic particles helps to reduce the probability of light L being emitted from the gaps between the black electrophoretic particles, thereby more effectively limiting the viewing angle. In addition, as mentioned above, the height of the light-emitting element 120 can also be adjusted according to the desired viewing angle specification, which will not be repeated here.

[0070] In some embodiments, although not shown, Fig.10 You can use Figure 8 The common electrode 16E shown in the figure can be used to omit the electrode E6. Fig. 9 as well as Fig.10 In the embodiment, the viewing angle is limited by absorbing light by black electrophoretic particles, but the present disclosure is not limited thereto. In other embodiments, the viewing angle can also be limited by reflecting the light L at a large angle from the light emitting element 120 by white electrophoretic particles, such as Figure 7 as well as Figure 8 The embodiments are shown in the embodiment and will not be repeated here.

[0071] In addition, although the reflectivity control element 130 in the above embodiment is illustrated in the form of microcup electrophoresis, the present disclosure is not limited thereto. Fig.11 The display device 1H and Fig.12 As shown in the display device 1I, the reflectivity control element 130 can also be in the form of microcapsules.

[0072] Please refer to Fig.13 In the reflectivity control unit 13J of the display device 1J, the reflectivity control element 130J may include a plurality of electrophoretic particles 131 (such as a plurality of black electrophoretic particles) and a solution 133 (such as a transparent solution). In addition, the bottom of the reflectivity control element 130J and the side wall of the reflectivity control element 130J away from the light emitting element 120 may be provided with an electrode E3 and an electrode E5, respectively. The electrode E3 is, for example, a reflective electrode (such as an electrode formed of a metal, an alloy, or a combination thereof).

[0073] By applying a positive voltage to the electrode E5, a plurality of electrophoretic particles 131 (for example, a plurality of negatively charged black electrophoretic particles) can be distributed on the side wall of the reflectivity control element 130J away from the light emitting element 120, thereby reducing the shielding of the black electrophoretic particles to the ambient light A or the light L at a large angle from the light emitting element 120 (i.e., having a wide viewing angle), and the ambient light A incident on the reflectivity control element 130J is reflected through the electrode E3. On the other hand, when the reflectivity control unit 13J is intended to provide a black image, no voltage may be applied to the electrode E5 and / or a positive voltage may be applied to the electrode E3, so that the plurality of electrophoretic particles 131 are distributed at the bottom of the reflectivity control element 130J to absorb the ambient light A incident on the reflectivity control element 130J.

[0074] Please refer to Fig.14 , the display device 1K may further include an electrode E6 disposed on the side wall of the reflectivity control element 130J facing the light emitting element 120. By applying a positive voltage to the electrode E5 and the electrode E6, a plurality of electrophoretic particles 131 (e.g., a plurality of negatively charged black electrophoretic particles) may be distributed on the side wall of the reflectivity control element 130J away from the light emitting element 120 and the side wall facing the light emitting element 120, so as to absorb the large-angle light L from the light emitting element 120 and the ambient light A incident on the reflectivity control element 130J at a large angle, thereby achieving the effect of limiting the viewing angle, and reflecting the ambient light A incident on the reflectivity control element 130J through the electrode E3.

[0075] On the other hand, when the reflectivity control unit 13J is to provide a black image, no voltage may be applied to the electrodes E5 and E6, and / or a positive voltage may be applied to the electrode E3, so that the plurality of electrophoretic particles 131 are distributed at the bottom of the reflectivity control element 130J to absorb the ambient light A incident on the reflectivity control element 130J.

[0076] In some embodiments, although not shown, Fig.13 as well as Fig.14 A plurality of transparent micro-bumps may be disposed on the electrode E3 in order to provide an anti-glare effect. In other embodiments, although not shown, a high reflective layer may be formed on the plurality of transparent micro-bumps to increase the intensity of reflected light by utilizing light scattering / diffraction.

[0077] Figures 15 to 19 They are partial cross-sectional schematic diagrams of various display devices according to different embodiments of the present disclosure. FIG. 20A to FIG. 20C They are Fig.19 Schematic diagrams of various parts of the reflectivity control unit from top view.

[0078] Please refer to Fig.15The main differences between the display device 1L and the aforementioned display device are described below. In the display device 1L, the light emitting element 120' is, for example, a vertical light emitting element, that is, the two electrodes of the light emitting element 120' are respectively located on the upper and lower sides of the semiconductor substrate. Under this architecture, the display unit 12 and the reflectivity control unit 13 can be electrically connected to the same common electrode (such as the common electrode 16), and the circuit layer 11L can be omitted. Figure 2A The display device 1L may further include an intermediary layer 18 (e.g., a fill layer, the material of which may refer to the intermediary layer 15), the intermediary layer 18 is disposed on the light emitting element 120' and the intermediary layer 15, and the common electrode 16 may be disposed on the intermediary layer 18 and the reflectivity control element 130, wherein the common electrode 16 may penetrate the intermediary layer 18 and be electrically connected to the light emitting element 120'. The common electrode 16 may be, for example, a transparent electrode, so that the light L emitted from the light emitting element 120' can be emitted from the top of the display device 1L, but the present invention is not limited thereto.

[0079] The display device 1L may further include a peripheral circuit 19, and the common electrode 16 may be electrically connected to the circuit layer 11L through the peripheral circuit 19. In some embodiments, the display unit 12 and the reflectivity control unit 13 may be electrically connected to different driving units, and the different driving units may be placed on different circuit carriers. For example, the display device 1L may further include a connecting circuit 20, a connecting circuit 21, a driving unit 22, a driving unit 23, a circuit carrier 24, and a circuit carrier 25. The connecting circuit 20 may be used to electrically connect the circuit layer 11L to the circuit carrier 24. The driving unit 22 is disposed on the lower surface of the circuit carrier 24, and the connecting circuit 20 may be electrically connected to the driving unit 22 through the circuit carrier 24. Similarly, the connecting circuit 21 may be used to electrically connect the circuit layer 11L to the circuit carrier 25. The driving unit 23 is disposed on the lower surface of the circuit carrier 25, and the connecting circuit 21 may be electrically connected to the driving unit 23 through the circuit carrier 25. The connection circuits 20 and 21 are, for example, flexible printed circuit boards, the driving units 22 and 23 are, for example, driving chips, and the circuit carriers 24 and 25 are, for example, printed circuit boards.

[0080] Please refer to Fig.16 , the display device 1M and Fig.15The main differences of the display device 1L are described below. The display device 1M is, for example, a bottom-light display device, wherein the display device 1M further includes an electrode 26, and the electrode 26 is disposed on the intermediate layer 18 and the common electrode 16, and the electrode 26 is, for example, a reflective electrode. The material of the electrode 26 includes, for example, metal, alloy, or a combination thereof. In some embodiments, the common electrode 16 can also serve as a reflective electrode. In the circuit layer 11M, the shading element (such as a transistor and a storage capacitor, etc.) can be staggered with the display unit 12 and the reflectivity control unit 13 in the direction D3, that is, the overlapping area of ​​the shading element with the display unit 12 and the reflectivity control unit 13 in the direction D3 is reduced, so as to reduce the shielding of the light L emitted by the self-luminous element 120' and the ambient light A by the shading element.

[0081] Please refer to Fig.17 , the display device 1N and Fig.16 The main differences between the display device 1M and the display device 1N are described below. In the display device 1N, the light emitting element 120 is, for example, a horizontal light emitting element, that is, the two electrodes of the light emitting element 120 are respectively located on the same side of the semiconductor substrate. In this architecture, the display unit 12 and the reflectivity control unit 13 can be electrically connected to different common electrodes, for example, the display unit 12 can be electrically connected to the electrode E2 (used as a common electrode), and the reflectivity control unit 13 can be electrically connected to the common electrode 16. In this architecture, the common electrode 16 may not overlap the display unit 12 in the direction D3, and the common electrode 16 is electrically insulated from the light emitting element 120.

[0082] In some embodiments, although not shown, Fig.15 The light emitting element 120' of the embodiment may be a horizontal light emitting element. In this structure, the display unit 12 and the reflectivity control unit 13 may be electrically connected to different common electrodes, and the common electrode 16 may be electrically insulated from the light emitting element and may not overlap the display unit 12 in the direction D3. In this way, the display device using the horizontal light emitting element may also be a top-emitting display device.

[0083] Please refer to Fig.18, the main differences between the display device 10 and the aforementioned display device are described below. In the display device 10, the display unit 12O is a non-self-luminous display unit. For example, the display unit 12O is a liquid crystal display unit and includes a liquid crystal layer 121. In addition, the display device 10 may further include a substrate 27 disposed opposite to the substrate 10. The material of the substrate 27 can refer to the material of the substrate 10 and will not be repeated here. In addition, the display device 10 may further include a common electrode 28, a black matrix 29 and a filter layer 30, wherein the common electrode 28 is a light-transmitting electrode, and the common electrode 28 and the electrode E1 are respectively located on opposite sides of the liquid crystal layer 121. The black matrix 29 is disposed on the surface of the substrate 27 facing the liquid crystal layer 121 and is located between the common electrode 28 and the substrate 27. The filter layer 30 may include a plurality of filter patterns (not shown), and the plurality of filter patterns are respectively located in a plurality of openings (not shown) of the black matrix 29.

[0084] Please refer to Fig.19 , the main differences between the display device 1P and the aforementioned display device are described below. In the display device 1P, the intermediate layer 15 does not completely cover the light-emitting element 120. In addition, the display device 1P also includes a color conversion layer 31 and an anti-reflection layer 32, wherein the color conversion layer 31 is disposed on the intermediate layer 15 and covers the light-emitting element 120, and the anti-reflection layer 32 is disposed on the color conversion layer 31. The material of the color conversion layer 31 includes, for example, fluorescence, phosphor, quantum dots (Quantum Dot, QD), other suitable materials or combinations thereof, but is not limited thereto. The anti-reflection layer 32 may include multiple low-refractive index medium layers and multiple high-refractive index medium layers alternately stacked in the direction D3.

[0085] In addition to the multiple electrophoretic particles 131, the multiple electrophoretic particles 132, and the solution 133, the reflectivity control element 130P may also include multiple reflective bumps 134, wherein the multiple reflective bumps 134 may be used to increase the reflection area / angle. In some embodiments, the multiple reflectivity control elements 130P in the reflectivity control unit 13 may have different top view patterns to reduce moiré patterns. For example, Fig. 20A As shown, the top view pattern of the plurality of reflective protrusions 134 may include a plurality of annular rectangles, and the plurality of annular rectangles may have the same center, but is not limited thereto. Fig. 20B As shown, the top view pattern of the plurality of reflective protrusions 134 may include a plurality of circular rings and an annular rectangle, and the plurality of circular rings and the annular rectangle may have the same center, but is not limited thereto. Fig. 20CAs shown, the top view pattern of the plurality of reflective protrusions 134 may include a grid shape composed of a plurality of vertical bars extending along the direction D1 and a plurality of horizontal bars extending along the direction D2, but the present invention is not limited thereto. In other embodiments, although not shown, the top view pattern of the plurality of reflective protrusions 134 may include a pattern composed of a circular rectangle and a plurality of vertical bars extending along the direction D1 or a pattern composed of a circular rectangle and a plurality of vertical bars extending along the direction D2, but the present invention is not limited thereto.

[0086] In summary, in the embodiments disclosed herein, by arranging the display unit and the reflectivity control unit on the same side of the substrate, multiple display modes can be provided on the same side of the display device. In addition, the state of the reflectivity control unit (e.g., the distribution of the electrophoretic particles) can be controlled by electronic control to control the viewing angle without an external viewing angle optical film.

[0087] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present disclosure.

[0088] Although the embodiments and advantages of the present disclosure have been disclosed as above, it should be understood that any person skilled in the art can make changes, substitutions and modifications without departing from the spirit and scope of the present disclosure, and the features between the embodiments can be arbitrarily mixed and replaced with each other to form other new embodiments. In addition, the scope of protection of the present disclosure is not limited to the processes, machines, manufacturing, material compositions, devices, methods and steps in the specific embodiments described in the specification. Any person skilled in the art can understand the current or future developed processes, machines, manufacturing, material compositions, devices, methods and steps from the disclosure of the present disclosure, as long as they can implement substantially the same functions or obtain substantially the same results in the embodiments described herein, they can all be used according to the present disclosure. Therefore, the scope of protection of the present disclosure includes the above-mentioned processes, machines, manufacturing, material compositions, devices, methods and steps. In addition, each claim constitutes a separate embodiment, and the scope of protection of the present disclosure also includes the combination of each claim and embodiment. The scope of protection of the present disclosure shall be determined by the attached claims.

Claims

1. A display device, characterized in that: include: substrate; A circuit layer is arranged on the substrate; A display unit, disposed on the substrate and electrically connected to the circuit layer; as well as A reflectivity control unit is disposed on the substrate and electrically connected to the circuit layer. The display unit and the reflectivity control unit are arranged on the same side of the substrate.

2. The display device according to claim 1, characterized in that The display unit and the reflectivity control unit are used to respectively display a first image and a second image in the same direction.

3. The display device according to claim 2, characterized in that: The display device is capable of operating in a first mode and a second mode. When the display device operates in the first mode, the display unit displays the first image, and when the display device operates in the second mode, the reflectivity control unit displays the second image.

4. The display device according to claim 3, characterized in that: When the display device operates in the first mode, the reflectivity control unit absorbs ambient light.

5. The display device according to claim 3, characterized in that: When the display device operates in the second mode, the display unit is turned off.

6. The display device according to claim 3, characterized in that: The reflectivity control unit includes a plurality of reflectivity control elements. When the display device operates in the second mode, a portion of the plurality of reflectivity control elements reflects light, and another portion of the plurality of reflectivity control elements absorbs ambient light.

7. The display device according to claim 3, characterized in that: The reflectivity control unit includes multiple reflectivity control elements. When the display device operates in the second mode, a first portion of the multiple reflectivity control elements reflects first light, and a second portion of the multiple reflectivity control elements reflects second light. The colors of the first light and the second light are different.

8. The display device according to claim 1, characterized in that: The display device is capable of operating in a first mode, a second mode and a third mode. When the display device operates in the first mode, the display unit displays a first image. When the display device operates in the second mode, the reflectivity control unit displays a second image. When the display device operates in the third mode, the display unit and the reflectivity control unit display different images.

9. The display device according to claim 1, characterized in that: The display device is capable of operating in a fourth mode. When the display device operates in the fourth mode, the display unit displays a third image, and the reflectivity control unit reflects light from the display unit.

10. The display device according to claim 1, characterized in that The display unit and the reflectivity control unit are electrically connected to the same common electrode.

11. The display device according to claim 1, characterized in that: The display unit and the reflectivity control unit are electrically connected to different common electrodes respectively.

12. The display device according to claim 1, characterized in that: The display unit includes a plurality of light emitting elements, the reflectivity control unit includes a plurality of reflectivity control elements, and in a top view, at least one of the plurality of light emitting elements is surrounded by one of the plurality of reflectivity control elements.

13. The display device according to claim 1, characterized in that The display unit includes a plurality of light emitting elements, the reflectivity control unit includes a plurality of reflectivity control elements, and a resolution of the plurality of light emitting elements is greater than or equal to a resolution of the plurality of reflectivity control elements.

14. The display device according to claim 1, characterized in that In a top view, an area occupied by the display unit is smaller than an area occupied by the reflectivity control unit.

15. The display device according to claim 1, characterized in that: The reflectivity control unit includes a plurality of reflectivity control elements, and each of the plurality of reflectivity control elements includes a plurality of electrophoretic particles.

16. The display device according to claim 15, characterized in that: Each of the plurality of reflectance control elements includes a plurality of black electrophoretic particles and a plurality of white electrophoretic particles.

17. The display device according to claim 15, characterized in that: Each of the plurality of reflectance control elements includes a plurality of black electrophoretic particles and a plurality of color electrophoretic particles.

18. The display device according to claim 1, characterized in that: The circuit layer comprises: A first-type transistor electrically connected to the display unit; and The second type transistor is electrically connected to the reflectivity control unit.

19. The display device according to claim 18, characterized in that The first-type transistor includes a silicon semiconductor, and the second-type transistor includes an oxide semiconductor.

20. The display device according to claim 18, characterized in that The first-type transistor has a first channel width and a first channel length, the second-type transistor has a second channel width and a second channel length, and a ratio of the first channel width to the first channel length is smaller than a ratio of the second channel width to the second channel length.

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