Display device

Abstract

The invention provides a display device, which is used for projecting light to an object and comprises a substrate, a plurality of light-emitting elements and a light adjusting layer. The substrate has a first region overlapping the first curved surface of the object and a second region overlapping the second curved surface of the object. The plurality of light-emitting elements are arranged on the substrate, and the plurality of light-emitting elements comprise a first light-emitting element arranged in the first area and a second light-emitting element arranged in the second area. The light adjusting layer is arranged on the multiple light-emitting elements and comprises a first light adjusting element used for enabling first emergent light of the first light-emitting element to have a first light-emitting direction, and a second light adjusting element used for enabling second emergent light of the second light-emitting element to have a second light-emitting direction. The included angle between the second light-emitting direction and the normal direction of the substrate is larger than the included angle between the first light-emitting direction and the normal direction of the substrate.

Description

Technical Field

[0001] This invention relates to a display device, and more particularly to a display device for projecting light onto an object. Background Technology

[0002] In recent years, display devices have become increasingly important in a wide variety of electronic applications, and existing technologies also allow them to project images. For example, display devices can be used in automotive displays, which can project images onto the windshield. However, because the surface of the windshield is curved, light emitted from the display device at different positions will have different incident angles, resulting in image distortion or uneven brightness. Summary of the Invention

[0003] The purpose of this invention is to provide a display device that improves image distortion or uneven brightness by providing a light adjustment layer including multiple light adjustment elements on the light-emitting element, so that light can have different emission angles in different areas.

[0004] This invention provides a display device for projecting light onto an object, the object having a first curved surface and a second curved surface. The display device includes a substrate, a plurality of light-emitting elements, and a light-adjusting layer. The substrate has a first region and a second region, the first region overlapping the first curved surface, and the second region overlapping the second curved surface, wherein the angle between the normal direction of the substrate and the normal direction of the second curved surface is greater than the angle between the normal direction of the substrate and the normal direction of the first curved surface. A plurality of light-emitting elements are disposed on the substrate, including a first light-emitting element and a second light-emitting element, the first light-emitting element being disposed in the first region and the second light-emitting element being disposed in the second region. The light-adjusting layer is disposed on the plurality of light-emitting elements, and includes a first light-adjusting element and a second light-adjusting element. The first light-adjusting element is used to give a first emitted light from the first light-emitting element a first emission direction, and the second light-adjusting element is used to give a second emitted light from the second light-emitting element a second emission direction. The angle between the second emission direction and the normal direction of the substrate is greater than the angle between the first emission direction and the normal direction of the substrate. Attached Figure Description

[0005] Figure 1 This is a side view schematic diagram of a display device projecting light onto an object according to an embodiment of the present invention.

[0006] Figure 2A This is a top view of an object according to an embodiment of the present invention.

[0007] Figure 2B for Figure 2A A schematic diagram showing the height change of the object shown.

[0008] Figure 3This is a side view schematic diagram of an embodiment of the display device of the present invention that projects light onto an object.

[0009] Figure 4 This is a partial cross-sectional schematic diagram of the display device according to the first embodiment of the present invention.

[0010] Figure 5 This is a partial cross-sectional schematic diagram of a variation of the display device according to the first embodiment of the present invention.

[0011] Figure 6 This is a partial cross-sectional schematic diagram of the display device according to the second embodiment of the present invention.

[0012] Figure 7 This is a partial cross-sectional schematic diagram of the display device according to the third embodiment of the present invention.

[0013] Figure 8 This is a partial cross-sectional schematic diagram of the display device according to the fourth embodiment of the present invention.

[0014] Explanation of reference numerals: 100, 102 - Substrate; 200 - Light-emitting element; 210 - First light-emitting element; 220 - Second light-emitting element; 230 - Third light-emitting element; 300 - Light adjustment layer; 310 - First light adjustment element; 312 - First prism section; 314 - First superlens; 320 - Second light adjustment element; 322 - Second prism section; 330 - Third light adjustment element; 332 - Third prism section; AL, AL1 - Adhesive layer; C1, C2, C3, C4, C5, C6 - Central axis; CP, CP1, CP2 - Connecting pad; D1 - First direction; D2 - Second direction; DE - Display device; DSL - Display layer; E1 - First electrode; E2 - Second electrode; EL - Light-emitting layer; FI - Filler material Material; I - First zone; II - Second zone; III - Third zone; L - Light ray; L1 - First light emission direction; L2 - Second light emission direction; L3 - Third light emission direction; LU - Light emission unit; N0 - Normal direction; OB - Object; OD1, OD2 - Distance; OL - Organic layer; OP - Opening; RP - Reflective part; RU - Reflective unit; RUa - Bottom; RUB - Sidewall; S1 - First curved surface; S2 - Second curved surface; S3 - Third curved surface; SP - Support part; ST - Microstructure; ST1 - Symmetrical structure; ST2, ST3 - Asymmetrical structure; TP - Light transmission part; UFI - Bottom filling material; W1, W2 - Width; X - Direction; α2, α1, α3, β2, β1, β3, θ - Angle. Detailed Implementation

[0015] The present invention will be described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, for ease of understanding and to keep the drawings concise, many of the accompanying drawings only depict a portion of the device or structure, and specific elements in the drawings are not drawn to scale. Furthermore, the number and dimensions of each element in the drawings are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0016] Throughout this specification and claims, certain terms are used to refer to specific elements. Those skilled in the art will understand that electronic device manufacturers may use different names to refer to the same element. This invention is not intended to distinguish between elements that have the same function but different names. In this specification and claims, terms such as "comprising" and "including" are open-ended terms and should therefore be interpreted as "containing but not limited to...". When the terms "comprising," "including," and / or "having" are used in this specification, they specify the presence of the stated feature, region, step, operation, and / or element, but do not exclude the presence or addition of one or more other features, regions, steps, operations, elements, and / or combinations thereof.

[0017] When an element or membrane is referred to as being "on" or "connected" to another element or membrane, it can be directly on or directly connected to the other element or membrane, or there can be an inserted element or membrane between the two. Conversely, when an element is referred to as being "directly" on or "directly connected" to another element or membrane, there can be no inserted element or membrane between the two.

[0018] The directional terms used in this invention, such as "up," "down," "front," "back," "left," and "right," are only for reference to the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the invention.

[0019] The terms “approximately,” “equal to,” “same,” “substantially,” or “roughly” are generally interpreted as being within 20% of a given value or range, or as being within 10%, 5%, 3%, 2%, 1%, or 0.5% of a given value or range.

[0020] The ordinal numbers used in the specification and claims of this invention, such as "first," "second," etc., to modify elements, do not in themselves imply or represent any prior ordinal number of that element (or those elements), nor do they represent the order of one element with another, or the order of manufacturing methods. The use of these ordinal numbers is solely to clearly distinguish one named element from another element with the same name. The claims and specification may not use the same terminology; therefore, a first element in the specification may be a second element in the claims.

[0021] The display device described in this invention can be applied in electronic devices, wherein the display device can be a non-self-emissive display device or a self-emissive display device. Furthermore, the electronic device may also include a backlight device, an antenna device, a sensing device, or a splicing device, but is not limited thereto. The electronic device can be a bendable or flexible electronic device. The antenna device can be a liquid crystal type antenna device or a non-liquid crystal type antenna device, and the sensing device can be a sensing device for capacitance, light, heat, or ultrasound, but is not limited thereto. Electronic components can include passive and active components, such as capacitors, resistors, inductors, diodes, transistors, etc. Diodes can include light-emitting diodes or photodiodes. Light-emitting diodes can include, for example, organic light-emitting diodes (OLEDs), mini LEDs, micro LEDs, or quantum dot LEDs, but are not limited thereto. The splicing device can 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 can be any arrangement and combination of the foregoing, but is not limited thereto.

[0022] It should be understood that, without departing from the spirit of the present invention, features in several different embodiments can be replaced, recombined, or mixed to complete other embodiments.

[0023] Please refer to Figure 1 , Figure 2A and Figure 2B . Figure 1 This is a side view schematic diagram of a display device projecting light onto an object according to an embodiment of the present invention. Figure 2A This is a top view of an object according to an embodiment of the present invention. Figure 2B for Figure 2A The diagram shows the height change of the object, where Figure 2B Show corresponding Figure 2A The height of object OB varies at different positions along the direction X, as shown by section line A-A'. Figure 1 , Figure 2A and Figure 2B As shown, the display device DE is used to project light onto the object OB. For example, the light emitted by the display device DE projected onto the object OB can form one or more projected images. Figure 2B The vertical axis represents height, and the horizontal axis represents the different positions of object OB along direction X, where direction X can be parallel to the horizontal direction. Figure 2B The points shown represent the distances between the surface (e.g., the top surface) of object OB and the reference horizontal plane at different positions when object OB is placed flat on a horizontal surface. Figure 2BAs shown by the curve, the height of object OB along direction X can change from high to low and then from low to high in a curved pattern. In other words, object OB can have a curved surface OBS, such as... Figure 1 As shown. In some embodiments, the object OB may be, for example (but not limited to), a windshield with a curved surface OBS protruding outwards from the vehicle. According to Figure 1 In the illustrated embodiment, the curved surface OBS of the object OB has a first curved surface S1 and a second curved surface S2, wherein the first curved surface S1 and the second curved surface S2 are different parts of the curved surface OBS. It should be noted that although the curved surface OBS is a single surface, and the first curved surface S1 and the second curved surface S2 are each part of the curved surface OBS, for the sake of clarity and to explain the spirit of the invention, therefore... Figure 1 The curved surface OBS is represented by a curved curve, and the first curved surface S1 and the second curved surface S2 are each represented by a line segment region of the curved curve. In some embodiments, the curved surface OBS of the object OB may also have a third curved surface S3, where the first curved surface S1 may be located between the second curved surface S2 and the third curved surface S3 in a first direction D1, wherein the first direction D1 may be parallel to the horizontal direction, for example, the first direction D1 may be the direction of view from the window adjacent to the driver's seat towards another window adjacent to the passenger seat. For example, see... Figure 3 This is a side view schematic diagram of an embodiment of the display device of the present invention projecting light onto an object, wherein... Figure 3 This is a side view taken along the first direction D1. (Example) Figure 3 As shown, the object OB can be, for example, the windshield of a vehicle, and the display device DE is suitable for installation in the vehicle and projecting light L onto the object OB. A user US on one side of the object OB can view the image formed by the light L projected onto the object OB, wherein the light L projected onto the object OB and the normal direction N0 of the curved surface OBS of the object OB can have an angle of 30 degrees to 70 degrees.

[0024] Please refer to Figure 4 and cooperate Figure 1 . Figure 4 This is a cross-sectional schematic diagram of the display device according to the first embodiment of the present invention, wherein... Figure 4 The cross-sectional structures of the upper, middle, and lower sides can be respectively corresponding to Figure 1 The diagram shows Zone I, Zone II, and Zone III. (Example:) Figure 1 and Figure 4 As shown, the display device DE includes a substrate 100, a plurality of light-emitting elements 200, and a light adjustment layer 300, wherein the light-emitting elements 200 and the light adjustment layer 300 are corresponding. Figure 1The display layer DSL is shown in the figure. The substrate 100 has a first region I and a second region II. In the second direction D2, the first region I overlaps with the first curved surface S1, and the second region II overlaps with the second curved surface S2, wherein the second direction D2 is the normal direction of the substrate 100, and the second direction D2 is different from the first direction D1, for example, the second direction D2 may be perpendicular to the first direction D1. The substrate 100 of this embodiment has a flat plate and does not have a curved surface, but is not limited thereto. Furthermore, the angle α2 between the second direction D2 (i.e., the normal direction of the substrate 100) and the normal direction N2 of the second curved surface S2 is greater than the angle α1 between the second direction D2 and the normal direction N1 of the first curved surface S1. According to Figure 1 In the embodiment shown, the included angle α1 may be, for example, 0 and is not indicated. Figure 1 However, the present invention is not limited thereto. In other embodiments, the included angle α1 may not be 0 and may be less than the included angle α2. In some embodiments, the substrate 100 may also have a third region III, where the first region I may be located between the second region II and the third region III in the first direction D1, and the third region III overlaps with the third curved surface S3. The included angle α3 between the second direction D2 (i.e., the normal direction of the substrate 100) and the normal direction N3 of the third curved surface S3 may be greater than the included angle α1 between the second direction D2 and the normal direction N1 of the first curved surface S1, wherein the included angle α3 may be equal to or not equal to the included angle α2. The substrate 100 may be a rigid substrate or a flexible substrate. The rigid substrate may include, for example, glass, ceramic or sapphire, and the flexible substrate may include, for example, polyimide (PI), polycarbonate (PC), polyethylene terephthalate (PET), poly(methyl methacrylate) (PMMA) or a composite layer composed of organic and inorganic materials, but is not limited thereto.

[0025] Multiple light-emitting elements 200 are disposed on the substrate 100 for use as a light source. The multiple light-emitting elements 200 include a first light-emitting element 210 and a second light-emitting element 220, with the first light-emitting element 210 disposed in a first region I and the second light-emitting element 220 disposed in a second region II. In some embodiments, the multiple light-emitting elements 200 may further include a third light-emitting element 230 disposed in a third region III. Figure 4In the illustrated embodiment, the display device DE may, for example, include a light-emitting layer EL disposed on a substrate 100. The light-emitting layer EL may include an organic layer OL and a plurality of light-emitting elements 200. The organic layer OL includes a plurality of openings OP, and each light-emitting element 200 may be disposed correspondingly within one of the plurality of openings OP. The organic layer OL may, for example (but not limited to), include an organic photoresist material, the color of which may be transparent, black, or white. In some embodiments, a single light-emitting element 200 (e.g., a first light-emitting element 210, a second light-emitting element 220, or a third light-emitting element 230) may include a light-emitting unit LU and a reflective unit RU. The reflective unit RU may be disposed around the light-emitting unit LU, and the light-emitting unit LU and the reflective unit RU may be disposed within one of the openings OP. The reflective unit RU is used to reflect the light emitted by the light-emitting unit LU, so that the light is concentrated in one direction (e.g., upward), thereby improving the luminous efficiency of the light-emitting element 200. The light-emitting unit LU may be, for example, an organic light-emitting diode (OLED), an inorganic light-emitting diode (LED), or a quantum dot LED (QLED), but is not limited thereto.

[0026] A light adjustment layer 300 is disposed on a plurality of light-emitting elements 200. The light adjustment layer 300 includes a first light adjustment element 310 and a second light adjustment element 320. The first light adjustment element 310 is disposed corresponding to the first light-emitting element 210 and used to give the first emitted light from the first light-emitting element 210 a first light emission direction L1. The second light adjustment element 320 is disposed corresponding to the second light-emitting element 220 and used to give the second emitted light from the second light-emitting element 220 a second light emission direction L2. The angle β2 between the second light emission direction L2 and the second direction D2 (i.e., the normal direction of the substrate 100) is greater than the angle β1 between the first light emission direction L1 and the second direction D2. Figure 1 In the embodiment shown, the included angle β1 may be, for example, 0 and is not indicated. Figure 1 However, this invention is not limited to this; in other embodiments, the included angle β1 may not be 0 and may be less than the included angle β2. In some embodiments, the light adjustment layer 300 may further include a third light adjustment element 330, which may be disposed corresponding to the third light-emitting element 230 and used to give the third emitted light of the third light-emitting element 230 a third light-emitting direction L3. The included angle β3 between the third light-emitting direction L3 and the second direction D2 (i.e., the normal direction of the substrate 100) is greater than the included angle β1 between the first light-emitting direction L1 and the second direction D2, wherein the included angle β3 may be equal to or not equal to the included angle β2.

[0027] Figure 4 Show corresponding Figure 1The partial cross-sectional structures of the first region I, second region II, and third region III of the substrate 100 shown indicate that the substrate 100 can actually be divided into multiple regions. Depending on the curvature of the curved surface OBS of the object OB, the light adjustment elements in the light adjustment layer 300 can adjust the angle between the emission direction of the emitted light from each region and the second direction D2 (i.e., the normal direction of the substrate 100), so that the angle gradually changes for different regions. According to the above structural design, by using multiple light adjustment elements (e.g., the first light adjustment element 310, the second light adjustment element 320, and / or the third light adjustment element 330) in the light adjustment layer 300, the emitted light from the light-emitting elements 200 in different regions has different emission angles. This reduces the distortion of the projected image of the object OB and also improves the uniformity of the emitted light brightness, thereby improving image quality.

[0028] according to Figure 4 In the illustrated embodiment, the first light adjustment element 310 may include a first prism portion 312, and the second light adjustment element 320 may include a second prism portion 322. In the cross-sectional view of the display device DE, the first prism portion 312 includes a plurality of symmetrical structures ST1, and the second prism portion 322 includes a plurality of asymmetrical structures ST2. The first emitted light from the first light-emitting element 210 can penetrate the first prism portion 312 and has a first light emission direction L1 (shown in the figure). Figure 1 The second emitted light from the second light-emitting element 220 can be deflected by the second prism portion 322 (e.g., deflected to the left) to have a second light emission direction L2 (shown in...). Figure 1 For example, the plurality of symmetrical structures ST1 of the first prism portion 312 may be equilateral triangles, and the plurality of asymmetrical structures ST2 of the second prism portion 322 may be scalene triangles (e.g., right triangles with the sloping face to the right), but are not limited thereto. In some embodiments, the third light adjustment element 330 may include the third prism portion 332, and in the cross-sectional view of the display device DE, the third prism portion 332 includes a plurality of asymmetrical structures ST3. The third emitted light of the third light-emitting element 230 may be deflected by the third prism portion 332 (e.g., deflected to the right) to have a third light emission direction L3 (shown in the figure). Figure 1 For example, the multiple asymmetrical structures ST3 of the third prism section 322 can be scalene triangles (e.g., right triangles with the sloping face on the left), but are not limited thereto. According to the above structural design, the multiple light adjustment elements of the light adjustment layer 300 (e.g., the first light adjustment element 310, the second light adjustment element 320, and / or the third light adjustment element 330) have prism sections with different shapes, which can make the emitted light from the light-emitting element 200 in different areas have different emission angles, thereby improving the uniformity of light brightness and reducing the distortion of the projected image.

[0029] like Figure 4As shown, the first light adjustment element 310 may further include a light-transmitting portion TP and a reflective portion RP. The reflective portion RP is disposed around the light-transmitting portion TP, and the first prism portion 312 is disposed on the light-transmitting portion TP. The first emitted light from the first light-emitting element 210 can penetrate the light-transmitting portion TP and be reflected by the reflective portion RP, so that the light is concentrated in one direction (e.g., upward), thereby improving the luminous efficiency. The light-transmitting portion TP may include a light-transmitting material, such as (but not limited to) acrylic materials, epoxy alkyl materials, siloxane, silica, or other suitable materials. The reflective portion RP may include a metallic material or a distributed Bragg reflector (DBR). The metallic material may include, for example (but not limited to), silver (Ag), aluminum (Al), or other suitable materials. The first light adjustment element 310 may also include, for example, a support portion SP surrounding the reflective portion RP. The support portion SP may include, for example (but not limited to), an organic photoresist material. Figure 4 In the cross-sectional view shown, the width W1 of the upper surface of the light-transmitting portion TP can be greater than the width W2 of the lower surface of the light-transmitting portion TP, so that the emitted light has a wider emission angle. In some embodiments, the width of the light-transmitting portion TP can gradually decrease from top to bottom, that is, the width between its upper surface width W1 and lower surface width W2 gradually decreases, but it is not limited thereto. Figure 4 In the embodiment shown, the second light adjustment element 320 and / or the third light adjustment element 330 may also include the light-transmitting part TP, the reflective part RP and the support part SP as described above, and the second prism part 322 / the third prism part 332 is disposed on the light-transmitting part TP to improve the luminous efficiency.

[0030] In some embodiments, such as Figure 4As shown, the display device DE may also optionally include another substrate 102 and an adhesive layer AL, the adhesive layer AL being disposed on the surface of the substrate 102. The adhesive layer AL may cover the first prism portion 312 of the first light adjustment element 310, the second prism portion 322 of the second light adjustment element 320, and the third prism portion 332 of the third light adjustment element 330, that is, in the second direction D2, the adhesive layer AL may be located between the light adjustment layer 300 and the substrate 102. In some embodiments, the refractive index of the adhesive layer AL is less than the refractive index of the first prism portion 312, the second prism portion 322, and the third prism portion 332. The display device DE may also optionally include an adhesive layer AL1, the light adjustment layer 300 located on one side of the substrate 102 being attached to the light-emitting layer EL through the adhesive layer AL1, that is, in the second direction D2, the adhesive layer AL1 may be located between the light adjustment layer 300 and the light-emitting layer EL. The adhesive layer AL and adhesive layer AL1 may include optical adhesives, such as (but not limited to) optical clear adhesive (OCA) or optical clear resin (OCR).

[0031] Please refer to Figure 5 This is a partial cross-sectional schematic diagram of a variation of the display device according to the first embodiment of the present invention, wherein... Figure 5 The cross-sectional structure shown can correspond to Figure 1 The first region I is shown. Figure 5 The display device DE shown is Figure 4 The difference in the first embodiment shown is that the display device DE includes only a single substrate 100. That is, as Figure 5 As shown, the light-emitting layer EL and the light-adjusting layer 300 can be sequentially stacked on the substrate 100 along the second direction D2, wherein the display device DE does not include, for example, Figure 4 The other substrate 102 shown, as well as adhesive layers AL and AL1.

[0032] Light-emitting element 200 (e.g.) Figure 5 The first light-emitting element 210 shown Figure 4 The first light-emitting element 210, the second light-emitting element 220, and the third light-emitting element 230 shown are... Figure 7 The first light-emitting element 210 shown may include a vertical-type light-emitting element, but is not limited thereto. The detailed structure of a light-emitting element 200 according to an embodiment of the present invention will be further described below. Specifically, as... Figure 5As shown, a single light-emitting element 200 may include a light-emitting unit LU, a first electrode E1, a second electrode E2, a reflective unit RU, a filling material FI, and multiple connection pads CP. One side of the light-emitting unit LU may be doped with a p-type semiconductor, and the other side may be doped with an n-type semiconductor, and a pn junction may be formed between the p-type semiconductor and the n-type semiconductor in the second direction D2, but this is not a limitation. The first electrode E1 and the second electrode E2 may be disposed on opposite sides of the light-emitting unit LU and opposite to each other in the second direction D2. Multiple connection pads CP may be disposed on the substrate 100, and multiple connection pads CP may be disposed within the opening OP of the organic layer OL. The first electrode E1 may be disposed on one of the connection pads CP, and the light-emitting unit LU may be electrically connected to one of the connection pads CP through the first electrode E1. In some embodiments, the reflective unit RU and the first electrode E1 may contain the same material. A reflective unit RU can be disposed around the light-emitting unit LU and connected to one or more connecting pads CP thereon. The reflective unit RU has a bottom RUa and a sidewall RUB. The bottom RUa is disposed on one or more connecting pads CP thereon, and there may be an angle θ between the sidewall RUB and the bottom RUa. The angle θ may be, for example (but not limited to), between 100 degrees and 170 degrees or between 120 degrees and 160 degrees. The two opposite ends of the second electrode E2 in the first direction D1 may be connected to the sidewall RUB of the reflective unit RU, and the light-emitting unit LU may be electrically connected to one or more connecting pads CP thereon through the second electrode E2 and the reflective unit RU. A filling material FI may be filled between the reflective unit RU and the second electrode E2, and the filling material FI may surround the light-emitting unit LU. According to the above structural design of the light-emitting element 200, its luminous efficiency can be improved. In some embodiments, a bottom filling material UFI may also be filled in the opening OP of the organic layer OL, that is, the bottom filling material UFI may be disposed between the light-emitting element 200 and the sidewall of the opening OP, but this is not a limitation. A reflective layer (not shown) can also be selectively disposed between the light-emitting unit LU and the first electrode E1 to further improve the light-emitting efficiency.

[0033] In some embodiments, the filling material FI may include a light-transmitting material with a transmittance of more than 90% for visible light, such as (but not limited to) acrylic materials, epoxy alkane materials, siloxanes, silicon dioxide, or other suitable materials. The first electrode E1 and the second electrode E2 may include transparent conductive oxide materials or metallic materials, such as (but not limited to) indium tin oxide (ITO). The connecting pad CP may include metallic materials, such as (but not limited to) gold (Au), tin (Sn), copper (Cu), indium (In), other suitable materials, or composite materials of combinations thereof. The reflective unit RU may include metallic materials, distributed Bragg reflectors, or combinations thereof, wherein the metallic materials include, for example (but not limited to), silver, aluminum, or other suitable materials. For example, the reflective unit RU may be formed from a stack of pure metals or alloys, having relatively high reflectivity while providing both reflective and electrical connection functions; or the reflective unit RU may be formed by covering the outside of a distributed Bragg reflector with a conductive metal layer; or the reflective unit RU may be formed from a highly reflective metal and another bonding metal stacked on its bonding side, but the invention is not limited to the above. The reflective unit RU and the connecting pad CP may be made of the same or different materials. The bottom filler material UFI may be an acrylic material, an epoxy alkane material, a siloxane, silica, or other suitable material.

[0034] The display device of the present invention is not limited to the above embodiments. Other embodiments of the display device of the present invention will be described in detail below. For the sake of simplicity, the same reference numerals are used to refer to the same elements in the present invention. The following mainly describes the differences between different embodiments in detail, and the same features will not be repeated.

[0035] Please refer to Figure 6 and cooperate Figure 1 . Figure 6 This is a partial cross-sectional schematic diagram of the display device according to the second embodiment of the present invention, wherein... Figure 6 The cross-sectional structures of the upper, middle, and lower sides can be respectively corresponding to Figure 1 The first zone I, the second zone II, and the third zone III are shown. Figure 6 The display device DE shown is Figure 4 The difference in the first embodiment shown is that the first prism portion 312 of the first light adjustment element 310 can be embedded in the light-transmitting portion TP, the second prism portion 322 of the second light adjustment element 320 can be embedded in the light-transmitting portion TP, and the third prism portion 332 of the third light adjustment element 330 can be embedded in the light-transmitting portion TP. Specifically, as Figure 6As shown, the first light adjustment element 310 includes a first prism portion 312, a light-transmitting portion TP, and a reflective portion RP. The reflective portion RP is disposed around the light-transmitting portion TP, and multiple recesses can be formed on the surface of the light-transmitting portion TP so that multiple symmetrical structures ST1 of the first prism portion 312 are embedded in the light-transmitting portion TP. The first emitted light from the first light-emitting element 210 can penetrate the first prism portion 312 and has a first light emission direction L1 (shown in the diagram). Figure 1 ).

[0036] Similarly, in the second embodiment, the light-transmitting portion TP of the second light-adjusting element 320 can be formed with multiple recesses so that multiple asymmetric structures ST2 of the second prism portion 322 are embedded in the light-transmitting portion TP. The second emitted light of the second light-emitting element 220 can be deflected by the second prism portion 322 (e.g., deflected to the left) to have a second light emission direction L2 (shown in the figure). Figure 1 The surface of the light-transmitting portion TP of the third light-adjusting element 330 can be formed with multiple recesses, so that multiple asymmetric structures ST3 of the third prism portion 332 are embedded in the light-transmitting portion TP. The third emitted light of the third light-emitting element 230 can be deflected by the third prism portion 332 (for example, deflected to the right) and has a third light emission direction L3 (shown in the figure). Figure 1 According to the above structural design, the multiple light adjustment elements of the light adjustment layer 300 (such as the first light adjustment element 310, the second light adjustment element 320 and / or the third light adjustment element 330) have prism sections with different shapes, which can make the emitted light of the light-emitting element 200 in different areas have different emission angles, thereby improving the uniformity of the projected image and the brightness of the light.

[0037] In such Figure 6 In the cross-sectional view shown, the width W1 of the upper surface of the light-transmitting portion TP can be greater than the width W2 of the lower surface of the light-transmitting portion TP, so that the emitted light has a wider emission angle. In some embodiments, the width of the light-transmitting portion TP can gradually decrease from top to bottom, that is, the width between its upper surface width W1 and lower surface width W2 gradually decreases, but it is not limited thereto. In some embodiments, such as Figure 6 As shown, the adhesive layer AL can be located between the light adjustment layer 300 and the substrate 102, and the adhesive layer AL can fill the depressions on the surfaces of the first light adjustment element 310, the second light adjustment element 320, and the third light adjustment element 330. In some embodiments, the refractive index of the adhesive layer AL is less than the refractive index of the first prism portion 312, the second prism portion 322, and the third prism portion 332.

[0038] Please refer to Figure 7 This is a partial cross-sectional schematic diagram of the display device according to the third embodiment of the present invention, wherein... Figure 7 The cross-sectional structure shown on the right can correspond to Figure 1 The first region I is shown. Figure 7 The display device DE shown is Figure 4The difference in the first embodiment shown is that each light adjustment element of the light adjustment layer 300 (e.g., the first light adjustment element 310, the second light adjustment element 320, and the third light adjustment element 330) may include a metalen. Specifically, as Figure 7 As shown, the first light adjustment element 310 may include a first meta-lens 314, which may be disposed, for example, on the light-transmitting portion TP. The first meta-lens 314 may include a plurality of microstructures ST, which are disposed on the light-transmitting portion TP. Figure 7 The left side shows a partially enlarged three-dimensional schematic diagram of the first meta-lens 314, wherein multiple microstructures ST can be micro / nanostructures and are arranged in an array, and each microstructure ST can be a columnar body (e.g., a cylinder). In some embodiments, the diameter of the microstructure ST can be less than 300 nanometers, and / or the spacing between two adjacent microstructure STs can be less than 300 nanometers, but is not limited thereto. The microstructure ST can, for example (but not limited to), include metallic materials. The first emitted light from the first light-emitting element 210 can pass through the first meta-lens 314 and have a first light emission direction L1 (shown in the diagram). Figure 1 ).

[0039] Similarly, in the third embodiment, the second light adjustment element 320 may include a second meta-lens (not shown), and the second emitted light from the second light-emitting element 220 may be deflected by the second meta-lens (e.g., deflected to the left) to have a second light emission direction L2 (shown in...). Figure 1 The third light adjustment element 330 may include a third superlens (not shown), and the third emitted light from the third light-emitting element 230 may be deflected by the third superlens (e.g., deflected to the right) to have a third light emission direction L3 (shown in...). Figure 1 The dimensions, distribution, and / or spacing of the microstructures included in the second and third metalenses may differ from the dimensions, distribution, and / or spacing of the microstructure ST in the first metalens 314. According to the above structural design, the multiple light-adjusting elements of the light-adjusting layer 300, with their different metalenses, allow the emitted light from the light-emitting elements 200 in different regions to have different emission angles, thereby improving the uniformity of the projected image and light brightness.

[0040] In some embodiments, such as Figure 7As shown, the display device DE may also optionally include another substrate 102 and an adhesive layer AL, which may be disposed on the surface of the substrate 102. The adhesive layer AL may cover the first metalens 314 of the first light adjustment element 310, the second metalens of the second light adjustment element 320, and the third metalens of the third light adjustment element 330. That is, the adhesive layer AL may be located between the light adjustment layer 300 and the substrate 102. In other embodiments, the display device DE may also include another adhesive layer (e.g., Figure 6 The adhesive layer AL1 shown is disposed between the light-emitting layer EL and the light-adjusting layer 300 and covers the second electrode E2, but is not limited thereto.

[0041] also, Figure 7 The light-emitting element 200 is shown as a vertical light-emitting element of another type. The detailed structure of the light-emitting element 200 according to another embodiment of the present invention will be further described below. Specifically, as... Figure 7 As shown, a single light-emitting element 200 may include a light-emitting unit LU, a first electrode E1, a second electrode E2, a reflective unit RU, a filling material FI, a connecting pad CP1, and a connecting pad CP2. The first electrode E1 and the second electrode E2 may be disposed on opposite sides of the light-emitting unit LU and opposite each other in a second direction D2. In some embodiments, the reflective unit RU and the first electrode E1 may contain the same material. The connecting pads CP1 and CP2 may be disposed on the substrate 100, with the connecting pad CP1 disposed within the opening OP of the organic layer OL, and the connecting pad CP2 not disposed within the opening OP of the organic layer OL. The reflective unit RU may be disposed around the light-emitting unit LU and does not extend to the bottom of the filling material FI. The light-emitting unit LU may be electrically connected to the connecting pad CP1 via the first electrode E1. The second electrode E2 is connected to the reflective unit RU, and the second electrode E2 may extend to the upper surface of the organic layer OL and connect to the connecting pad CP2 through a connecting hole VI in the organic layer OL, such that the light-emitting unit LU may be electrically connected to the connecting pad CP2 via the second electrode E2. The filling material FI can be filled between the reflective unit RU and the second electrode E2, and the filling material FI can surround the light-emitting unit LU. In some embodiments, the bottom filling material UFI can also be filled in the opening OP of the organic layer OL, but this is not a limitation.

[0042] Please refer to Figure 8 and cooperate Figure 1 . Figure 8 This is a partial cross-sectional schematic diagram of the display device according to the fourth embodiment of the present invention, wherein... Figure 8 The cross-sectional structures of the upper, middle, and lower sides can be respectively corresponding to Figure 1 The diagram shows Zone I, Zone II, and Zone III. According to... Figure 8In the illustrated embodiment, corresponding to the first region I of the substrate 100, the first light adjustment element 310 may include a light-transmitting portion TP and a reflective portion RP. The reflective portion RP is disposed around the light-transmitting portion, and in the cross-sectional view of the display device DE, the central axis C1 of the first light adjustment element 310 coincides with the central axis C2 of the first light-emitting element 210. The central axis C1 of the first light adjustment element 310 may be the central axis of its light-transmitting portion TP, and the central axis C2 of the first light-emitting element 210 may be the central axis of its light-emitting unit LU. The first emitted light from the first light-emitting element 210 can penetrate the light-transmitting portion TP and has a first light emission direction L1 (shown in…). Figure 1 ).

[0043] Corresponding to the second region II of the substrate 100, the second light adjustment element 320 may include a light-transmitting portion TP and a reflective portion RP. The reflective portion RP is disposed around the light-transmitting portion TP, and in the cross-sectional view of the display device DE, the central axis C3 of the second light adjustment element 320 and the central axis C4 of the second light-emitting element 220 are offset from each other. The central axis C3 of the second light adjustment element 320 may be the central axis of its light-transmitting portion TP, and the central axis C4 of the second light-emitting element 220 may be the central axis of its light-emitting unit LU. Figure 8 As shown, the central axis C3 of the second light adjustment element 320 can be offset to the left from the central axis C4 of the second light-emitting element 220, that is, there is a distance OD1 between the central axis C3 and the central axis C4 in the first direction D1, so that the second emitted light of the second light-emitting element 220 can be deflected by the second light adjustment element 320 (for example, deflected to the left) and have a second light emission direction L2 (shown in...). Figure 1 ).

[0044] Corresponding to the third region III of the substrate 100, the third light adjustment element 330 may include a light-transmitting portion TP and a reflective portion RP. The reflective portion RP is disposed around the light-transmitting portion TP, and in the cross-sectional view of the display device DE, the central axis C5 of the third light adjustment element 330 and the central axis C6 of the third light-emitting element 230 are offset from each other. The central axis C5 of the third light adjustment element 330 may be the central axis of its light-transmitting portion TP, and the central axis C6 of the third light-emitting element 230 may be the central axis of its light-emitting unit LU. Figure 8 As shown, the central axis C5 of the third light adjustment element 330 can be offset to the right from the central axis C6 of the third light-emitting element 230, that is, there is a distance OD2 between the central axis C5 and the central axis C6 in the first direction D1, so that the third emitted light of the third light-emitting element 230 can be deflected by the third light adjustment element 330 (for example, deflected to the right) and have a third light emission direction L3 (shown in the figure). Figure 1 Based on the structural design of the multiple light adjustment elements in the light adjustment layer 300, the emitted light from the light-emitting elements 200 in different areas can have different emission angles, thereby improving the uniformity of light brightness and reducing the distortion of the projected image.

[0045] In some embodiments, such as Figure 8 As shown, the display device DE may also optionally include another substrate 102 and an adhesive layer AL1. The light adjustment layer 300 may be disposed on the surface of the substrate 102 and located on one side of the substrate 102. The light adjustment layer 300 may be attached to the light-emitting layer EL through the adhesive layer AL1. That is, in the second direction D2, the light adjustment layer 300 may be located between the adhesive layer AL1 and the substrate 102.

[0046] In summary, the display device according to embodiments of the present invention, by providing a light adjustment layer including multiple light adjustment elements on the light-emitting element, allows the emitted light from the light-emitting element in different areas to have different emission angles, thereby improving the uniformity of light brightness and reducing projected image distortion, thus enhancing image quality. Furthermore, the light adjustment elements in different areas can have different optical structure designs.

[0047] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A display device, characterized in that, The display device is used to project light onto an object, the object having a first curved surface and a second curved surface, the display device comprising: A substrate has a first region and a second region, the first region overlapping a first curved surface, and the second region overlapping a second curved surface, wherein the angle between a normal direction of the substrate and a normal direction of the second curved surface is greater than the angle between the normal direction of the substrate and a normal direction of the first curved surface. Multiple light-emitting elements are disposed on the substrate, the multiple light-emitting elements including a first light-emitting element and a second light-emitting element, the first light-emitting element being disposed in a first region, and the second light-emitting element being disposed in a second region; and A light adjustment layer is disposed on the plurality of light-emitting elements. The light adjustment layer includes a first light adjustment element and a second light adjustment element. The first light adjustment element is used to make a first emitted light from the first light-emitting element have a first light emission direction, and the second light adjustment element is used to make a second emitted light from the second light-emitting element have a second light emission direction. Wherein, the angle between the second light-emitting direction and the normal direction of the substrate is greater than the angle between the first light-emitting direction and the normal direction of the substrate.

2. The display device as claimed in claim 1, characterized in that, The first light adjustment element includes a first prism portion, the second light adjustment element includes a second prism portion, and in a cross-sectional view of the display device, the first prism portion includes a plurality of symmetrical structures, and the second prism portion includes a plurality of asymmetrical structures.

3. The display device as claimed in claim 2, characterized in that, The first light adjustment element includes a light-transmitting part and a reflective part, the reflective part being disposed around the light-transmitting part, and the first prism part being disposed on the light-transmitting part.

4. The display device as claimed in claim 3, characterized in that, In the cross-sectional view, the width of the upper surface of the light-transmitting part is greater than the width of the lower surface of the light-transmitting part.

5. The display device as claimed in claim 2, characterized in that, The first light adjustment element includes a light-transmitting part and a reflective part, the reflective part is disposed around the light-transmitting part, and the first prism part is embedded in the light-transmitting part.

6. The display device as claimed in claim 5, characterized in that, In the cross-sectional view, the width of the upper surface of the light-transmitting part is greater than the width of the lower surface of the light-transmitting part.

7. The display device as claimed in claim 1, characterized in that, The first light adjustment element includes a first superlens, and the second light adjustment element includes a second superlens.

8. The display device as claimed in claim 1, characterized in that, The first light adjustment element includes a light-transmitting portion and a reflective portion, the reflective portion being disposed around the light-transmitting portion, and in a cross-sectional view of the display device, the central axis of the first light adjustment element coincides with the central axis of the first light-emitting element.

9. The display device as claimed in claim 1, characterized in that, The second light adjustment element includes a light-transmitting portion and a reflective portion, the reflective portion being disposed around the light-transmitting portion, and in a cross-sectional view of the display device, the central axis of the second light adjustment element is offset from the central axis of the second light-emitting element.

10. The display device as claimed in claim 1, characterized in that, The first light-emitting element includes a light-emitting unit and a reflective unit, wherein the reflective unit is disposed around the light-emitting unit.

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