Display device, method, optical engine and wearable device

Abstract

This disclosure relates to a display device, method, optomechanic, and wearable device. An embodiment of the display device includes: a first display unit, the first display unit including a first light-emitting area, the first light-emitting area including a plurality of first light-emitting elements, each of the first light-emitting elements being configured to be driven independently; a second display unit, distributed at a first angle to the first display unit, the second display unit including one or more second light-emitting areas, each second light-emitting area including one or more second light-emitting elements, all the second light-emitting elements included in each second light-emitting area being configured to be driven uniformly; and a prism assembly located between the first display unit and the second display unit.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and in particular to a display device, method, optomechanic, and wearable device. Background Technology

[0002] Existing RGB (Red, Green, Blue) combined Micro-LED optical engines can display normal full-color images, such as photos and videos. However, they require three Micro-LED chips with CMOS drivers. Optical engines using only a single green Micro-LED cannot display red, yellow, blue, or other colors. Summary of the Invention

[0003] In a first aspect, embodiments of this disclosure provide a display device, including:

[0004] A first display unit, the first display unit includes a first light-emitting area, the first light-emitting area includes a plurality of first light-emitting elements, each of the first light-emitting elements being configured to be driven independently;

[0005] The second display unit is distributed at a first angle to the first display unit. The second display unit includes one or more second light-emitting areas, each of which includes one or more second light-emitting elements. All the second light-emitting elements included in each second light-emitting area are configured to be uniformly driven.

[0006] The prism assembly is located between the first display unit and the second display unit.

[0007] Secondly, embodiments of this disclosure provide an optical engine, including a display device as described in any of the embodiments of the first aspect above, and a lens group, wherein the lens group enables light emitted by the prism group to be emitted through the lens group.

[0008] Thirdly, embodiments of this disclosure provide a wearable device including the optical engine described in any of the embodiments of the second aspect above.

[0009] Fourthly, embodiments of this disclosure provide a display method, implemented based on the display device described in any of the embodiments of the first aspect, comprising:

[0010] The first display unit of the display device is driven to emit one or more first monochrome display contents;

[0011] The second display unit driving the display device emits one or more second monochrome display contents;

[0012] One or more of the first monochrome display content and one or more of the second monochrome display content pass through the prism assembly of the display device to form composite color display content. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of a display device provided in one embodiment of the present disclosure;

[0015] Figure 2 This is a schematic diagram of the structure of a prism assembly provided in one embodiment of the present disclosure;

[0016] Figure 3 This is a schematic diagram of the structure of a first display unit provided in one embodiment of the present disclosure;

[0017] Figure 4 This is a schematic diagram of the structure of a second display unit provided in one embodiment of the present disclosure;

[0018] Figure 5 This is a schematic diagram of the structure of a second light-emitting element provided in one embodiment of the present disclosure;

[0019] Figure 6 This is a schematic diagram of the structure of a second light-emitting element provided in one embodiment of the present disclosure;

[0020] Figure 7 This is one of the schematic diagrams showing the combined color display content according to an embodiment of this disclosure;

[0021] Figure 8 This is a schematic diagram of the structure of a display device provided in one embodiment of the present disclosure;

[0022] Figure 9 This is a second schematic diagram showing the combined color display content according to an embodiment of this disclosure;

[0023] Figure 10 This is one of the top views of the internal structure of an optical engine provided in one embodiment of the present disclosure;

[0024] Figure 11 This is a second top view of the internal structure of an optical engine provided in one embodiment of the present disclosure;

[0025] Figure 12 This is a schematic flowchart illustrating a display method provided in one embodiment of the present disclosure. Detailed Implementation

[0026] To make the technical solutions and advantages of this disclosure clearer, the technical solutions of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0027] The terms "first," "second," etc., used in this disclosure and in the claims are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this disclosure can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first" and "second" can be of the same class, without limiting the number of objects; for example, the first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0028] The full-color optical engine primarily uses RGB (Red, Green, Blue) Micro-LED screens, which feature high pixel density (Pixels Per Inch, PPI). However, this type of full-color optical engine typically requires three different monochrome Micro-LED screens, each driven by a corresponding CMOS (Complementary Metal Oxide Semiconductor) or TFT (Thin Film Transistor). For AR (Augmented Reality) products, using such a full-color optical engine presents relatively greater manufacturing challenges and higher costs.

[0029] Some AR products use a single-color Micro-LED display screen, reducing the display from full-color to monochrome (e.g., displaying only red, yellow, or green). Monochrome displays can often degrade the user experience. Furthermore, monochrome displays have significant limitations; for example, displaying alarm information in green instead of red contradicts established usage habits.

[0030] One embodiment of this disclosure provides a display device in which each first light-emitting element in the first light-emitting area of ​​a first display unit is configured to be driven independently, so that the first light-emitting element independently emits or de-emits light to emit one or more first monochrome display contents. In a second display unit, multiple second light-emitting elements in one or more second light-emitting areas are configured to be driven uniformly, emitting or de-emittering light as a whole to emit one or more second monochrome display contents. These contents can be combined using prisms to form a multi-color display. Each first light-emitting element in the first display unit can emit or de-emitter independently, generating various display contents according to different needs. All second light-emitting elements in each second light-emitting area of ​​the second display unit emit or de-emitter as a whole, eliminating the need for separate driving circuits for each second light-emitting element, thus reducing manufacturing complexity and cost. In some examples, the second monochrome display contents emitted by the second display unit can be used as warning content; for example, the second display unit can emit red light. Compared to display devices composed of monochrome display units, the display device provided in this embodiment provides two display units to generate one or more display contents with at least two monochrome colors, and the composite color display contents are formed by a prism group, which has a higher display comfort, and the second display unit can emit red light to conform to the user's usage habits.

[0031] Obviously, the first monochrome display content, the second monochrome display content, and the combined color display content mentioned above can include patterns, text, numbers, characters, symbols, or any combination thereof.

[0032] The display device provided in this disclosure can be applied to wearable devices and / or terminal devices. The wearable device may be AR (Augmented Reality) glasses, VR (Virtual Reality) glasses / headsets, MR (Mixed Reality) glasses / headsets, or other wearable devices. This disclosure does not limit the specific type of wearable device.

[0033] Figure 1 This is a schematic diagram of the structure of a display device provided in one embodiment of this disclosure. Figure 1 As shown, the display device includes:

[0034] The first display unit 101 can emit one or more first monochrome display contents;

[0035] The second display unit 102 is distributed at a first angle to the first display unit 101 and can emit one or more second monochrome display contents;

[0036] The prism group 103 is located between the first display unit 101 and the second display unit 102. The prism group 103 can receive one or more first monochrome display contents and one or more second monochrome display contents to form composite color display contents.

[0037] It is understood that the aforementioned prism group can also be called a color-combining prism. The first display unit and the second display unit face the two input surfaces of the prism group so that the prism group can receive the light emitted by the first display unit and the second display unit. For example, the first display unit faces the input surface A1, and the second display unit faces the input surface A2 or the input surface A3. The structural design of the prism group allows the light emitted by the first display unit to pass directly through the prism group, while the light emitted by the second display unit, which is distributed at a first angle relative to the first display unit, is reflected in the prism group, and thus combined with the light emitted by the first display unit at one output surface B1 of the prism group to obtain the color-combined display content.

[0038] The first display unit and the second display unit are distributed at a first included angle. The first included angle can be determined based on the included angle between the planes on which the first display unit and the second display unit are distributed. For example, the first included angle between the first display unit and the second display unit can be 90 degrees, that is, the first display unit and the second display unit are distributed on mutually perpendicular planes. The included angle between the first display unit and the second display unit can also be less than 90 degrees or greater than 90 degrees, which is not a limitation of this disclosure.

[0039] Please see the appendix Figure 2 The diagram shown is a structural schematic of a prism assembly provided in one embodiment of this disclosure, comprising:

[0040] First Prism 1031;

[0041] Second prism 1032;

[0042] Third prism 1033;

[0043] And the fourth prism 1034.

[0044] The aforementioned prism assembly can be made by bonding together a first prism, a second prism, a third prism, and a fourth prism. Each prism can have a coating, such as a red light coating or a blue light coating. For example, when the second display unit is distributed on the input surface A2, the reflective film A can be a red light reflective film, and the reflective film B can be a blue light reflective film. This allows the red light emitted by the second display unit to be refracted when passing through the reflective film A and directly transmitted when passing through the reflective film B. This allows the green light emitted by the first display unit to be directly transmitted through the reflective films A and B. As a result, the first monochrome display content emitted by the first display unit and the second monochrome display content emitted by the second display unit form a combined color display content on the output surface of the prism assembly.

[0045] Obviously, the aforementioned reflective film A and reflective film B can be adjusted according to the monochrome emitted by the first display unit and the position of the second display unit. For example, when the first display unit emits red light and the second display unit emits green light, reflective film A can be a green light reflective film and reflective film B can be a blue light reflective film. This is not a limitation of this disclosure.

[0046] Specifically, please refer to the appendix. Figure 3 The diagram shown is a structural schematic of a first display unit provided in an embodiment of this disclosure. The first display unit includes:

[0047] The first light-emitting area 1011 includes a plurality of first light-emitting elements 1012, each of which is configured to be driven independently.

[0048] It is understood that in the embodiments of this disclosure, the first light-emitting element can be an independent pixel unit, and the pixel unit emits a monochromatic light, such as green light. The first display unit can be an LED array composed of multiple pixel units. For example, the pixel unit can be a micro-LED or an organic light-emitting diode (OLED). These LED arrays constitute the first light-emitting area, which includes multiple first light-emitting elements, that is, multiple light-emitting pixel units. Each first light-emitting element is configured to be driven independently and can emit light or not emit light (cancel light emission) individually. That is, the first display unit can emit different first monochromatic display content by combining different pixel units, and has the characteristics of high pixel density units.

[0049] The aforementioned pixel unit can be circular, rectangular, or elliptical, etc., and the shape of the aforementioned pixel unit is not a limitation of this disclosure.

[0050] Specifically, please refer to the appendix. Figure 4 The diagram shown is a structural schematic of a second display unit provided in an embodiment of this disclosure. The second display unit includes:

[0051] One or more second light-emitting areas 1021, each second light-emitting area 1021 including one or more second light-emitting elements 1022, and all the second light-emitting elements 1022 included in each second light-emitting area 1021 are configured to be uniformly driven.

[0052] Understandable, in the appendix Figure 4In the illustrated embodiment, the second display unit includes three second light-emitting areas, each forming a different second monochrome display content. The number and shape of the second light-emitting areas can be arbitrarily set and are not limited by this disclosure. For example, the specific display content can be simple geometric shapes, such as common dot shapes, line shapes, triangles, circles, cross shapes, rectangles, etc., or various irregular shapes, or text, numbers, English letters, etc. The color of these display contents is determined by the second monochrome of the corresponding second display unit. The second display unit can include multiple second light-emitting elements, which can be pixel units. For example, pixel units can be micro-LEDs, organic light-emitting diodes (OLEDs), or quantum dot light-emitting diodes (QLEDs). Multiple pixel units form an LED array to constitute the second light-emitting area, and the multiple pixel units in the second light-emitting area are configured to be uniformly driven, achieving light emission or non-emission (cancellation of light emission) as a whole. The aforementioned pixel units uniformly emit a different monochromatic light than the first monochromatic light, such as red light, and the pixel units in each second light-emitting area are uniformly lit or unlit, so that the second display unit emits one or more second monochromatic display contents, and the shape and position of the aforementioned display contents are fixed after the second display unit is formed.

[0053] The aforementioned pixel unit can be circular, rectangular, or elliptical, etc., and the shape of the aforementioned pixel unit is not a limitation of this disclosure.

[0054] For example, the second light-emitting area may also include a second light-emitting element, such as a light-emitting diode (LED), which emits a second monochrome display content by illuminating the LED.

[0055] Obviously, the first monochrome and the second monochrome mentioned above both represent a single color. The colors of the first monochrome and the second monochrome are different. The display content of the first monochrome emitted by the first display unit and the display content of the second monochrome emitted by the second display unit are combined by a prism to form a composite color display content. Such composite color display content includes two different colors, which can provide high-definition display content (e.g., green, e.g., a pattern) or display content (e.g., a warning color, e.g., red) (e.g., a pattern).

[0056] In this embodiment, the first monochrome display content provided by the first display unit with the first light-emitting element emitting light or not emitting light independently, and the second monochrome display content provided by the second display unit with one or more second light-emitting elements in the second light-emitting area as a whole, which are emitting light or not emitting light, are combined by a prism to form a composite color display content. Since each light-emitting element of the first display unit can be driven individually by the driving circuit, the first monochrome display content emitted by the first display unit has the characteristics of high resolution and high contrast. The one or more second light-emitting elements under each light-emitting area in the second display unit are driven uniformly, and the emitted second monochrome display content (e.g., a red light pattern) can meet the requirement of providing a warning function. The first display unit and the second display unit are distributed at a first angle, and the prism group is located between the first display unit and the second display unit to form the display device of this disclosure.

[0057] In some embodiments, the first display unit further includes a driving backplane, wherein each driving circuit in the driving backplane is used to drive different first light-emitting elements to independently emit light or cancel light emission, and the driving backplane includes a CMOS driving backplane or a TFT driving backplane.

[0058] Taking the first display unit as an example, which is composed of a micro-LED array, after the pixel unit array in the first display unit is fabricated, the pixel unit array is peeled off from the substrate. The substrate can be sapphire, gallium arsenide, silicon, etc. Through transfer technology, the micro-LED array is bonded to the driving backplane, so that each pixel unit in the micro-LED array is bonded to a driving circuit in the driving backplane. Each driving circuit in the driving backplane is used to drive one pixel unit. There is a one-to-one correspondence between the pixel unit and the driving circuit. The driving backplane can be a complementary metal oxide semiconductor (CMOS) driving backplane or a thin film transistor (TFT) driving backplane.

[0059] It is understandable that the second light-emitting area within the second display unit can be illuminated or de-illuminated as a whole, and the pixel units within the second light-emitting area are lit up as a whole by an external power supply, without needing to be connected to a driver backplane to drive each pixel unit individually.

[0060] Taking the second light-emitting area in the second display unit as being composed of a micro-LED array as an example, after the pixel unit array in the second display unit is fabricated, it is not necessary to peel the pixel unit array off the substrate. After the pixel unit array is made conductive, one pixel unit is connected to an external power supply. For example, when the anodes of all pixel units are made conductive, the anode of one pixel unit is connected to the drain of the external power supply. After all pixel units form a common cathode, they are connected to the source. That is, the drain power supply voltage (VDD) and the source power supply voltage (VSS) are provided by the external power supply.

[0061] It is understandable that the second light-emitting region can also be a light-emitting diode (LED). The fabrication process is the same as that described above, where the second light-emitting region is a micro-LED array. The only difference is that only one LED needs to be fabricated for the second light-emitting region, which will not be elaborated upon here. In this case, the anode of the LED is connected to the drain of the external power supply, and the cathode is connected to the source.

[0062] For example, the anode of the aforementioned light-emitting diode can be connected to the drain of an external power supply, and the cathode of the aforementioned light-emitting diode can be connected to the source. The aforementioned light-emitting diode and the external power supply can be switched and controlled by, for example, a power diode. For example, a power diode can be connected between the anode of the light-emitting diode and the drain of the external power supply. When a bias voltage greater than the turn-on voltage of the power diode is applied to the drain of the external power supply, the power diode is turned on, and the light-emitting diode is driven to light up. Conversely, when the power diode is turned off, the light-emitting diode is not driven.

[0063] Obviously, the different shapes of each second luminous area result in different second monochrome display content, which can be any graphic pattern, such as geometric or non-geometric shapes. Geometric shapes mainly include dot-like shapes, line-like shapes, or other arbitrary shapes. Other arbitrary shapes can be regular or irregular. Common regular shapes include squares, rectangles, triangles, pentagons, circles, ellipses, and columnar shapes.

[0064] It should be noted that, in the embodiments of this disclosure, the driving circuit in the driving backplane can be configured as, for example, a 3T1C (i.e., three transistors and one capacitor) structure, a 7T1C structure, a 7T2C structure, a 6T1C structure, a 6T2C structure, or a 9T2C structure, and the embodiments of this disclosure do not limit this.

[0065] Please see the appendix Figure 5 The diagram shown is a structural schematic of a second light-emitting element provided in one embodiment of this disclosure, comprising:

[0066] Substrate 21;

[0067] Buffer layer 22 is stacked on substrate 21;

[0068] N-type material layer 23 is stacked on buffer layer 22;

[0069] A multi-quantum-well layer 24, a region stacked on an N-type material layer 23;

[0070] P-type material layer 25 is stacked on multiple quantum well layer 24;

[0071] A current diffusion layer 26 is stacked on the P-type material layer 25;

[0072] P-type electrode layer 27 is stacked on current diffusion layer 26.

[0073] In one embodiment, a second light-emitting region may include multiple second light-emitting elements as described in the above schematic diagram; that is, each second light-emitting region can be fabricated individually or together. The cathodes of multiple second light-emitting elements within a second light-emitting region are composed of a single N-type material layer, or the cathodes of multiple second light-emitting elements within multiple second light-emitting regions are all composed of a single N-type material layer. Its structure, from bottom to top, may be a substrate, a buffer layer, an N-type material layer, a multiple quantum well layer, a P-type material layer, a current diffusion layer, and a P-type electrode layer. Each second light-emitting element is interconnected; for example, the anodes of all second light-emitting elements within a second light-emitting region are interconnected by connecting the P-type electrode layer of at least one second light-emitting element to the drain of an external power supply, for example, by connecting the P-type electrode layer of at least one second light-emitting element to the drain of an external power supply via gold wire. The N-type material layer forms a common cathode connected to the source. Exemplarily, the external power supply can be provided by a device mounted on the display device, such as a circuit board connected to the device via an FPC (Flexible Printed Circuit). The substrate material can be sapphire, with aluminum oxide (Al₂O₃), silicon (Si), gallium nitride (GaN), or gallium arsenide (GaAs) as its main components. Depending on the second monochromatic color displayed by the second display unit, the material of the multiple quantum well layer may also differ. For example, indium gallium nitride (InGaN) or gallium nitride (GaN) is used to fabricate green / blue Micro-LED / QLED / OLED / LED arrays, while aluminum gallium indium phosphide (AlGaInP) or gallium arsenide (GaAs) is used to fabricate red Micro-LED / QLED / OLED / LED arrays.

[0074] It is understood that the shape and positional distribution of one or more second monochrome display contents are determined by the overlapping region of the current diffusion layer and the multiple quantum well layer in the multiple second light-emitting elements.

[0075] It can be understood that holes emitted from the P-type material layer and electrons emitted from the N-type material layer combine in the multi-quantum well layer to achieve light emission. Therefore, the actual light-emitting part of each second light-emitting element is the multi-quantum well layer. The current diffusion layer determines the current path that can enter the P-type material layer and also determines which regions in the multi-quantum well layer are the main light-emitting sites. Therefore, for each second light-emitting region, the overlapping area of ​​the current diffusion layer and the multi-quantum well layer of all the second light-emitting elements within it determines the shape formed after light emission, that is, it determines the second monochromatic display content that the second light-emitting region can form. The positional distribution of the overlapping area of ​​the current diffusion layer and the multi-quantum well layer determines the position of the second monochromatic display content emitted by the second light-emitting region.

[0076] For example, in one second light-emitting area, the shape formed by the overlapping region of the current diffusion layer and the multiple quantum well layer in each second light-emitting element after emitting light is a triangle; in another second light-emitting area, the shape formed by the overlapping region of the current diffusion layer and the multiple quantum well layer in each second light-emitting element after emitting light is a circle; and in yet another second light-emitting area, the shape formed by the overlapping region of the current diffusion layer and the multiple quantum well layer in each second light-emitting element after emitting light is a cross. And each multiple quantum well layer emits red light. Then, the three second monochrome display contents finally displayed by the second display unit are a red triangle, a red circle, and a red cross.

[0077] In another embodiment, a second light-emitting region includes a second light-emitting element as described in the above schematic diagram. Each second light-emitting region can be fabricated individually or collectively. Multiple second light-emitting elements constitute multiple second light-emitting regions, ultimately forming the entire second display unit. In this case, the P-type electrode layer of each second light-emitting element serves as the anode connected to the drain of an external power supply, and the N-type material layer serves as the common cathode connected to the source of each second light-emitting element.

[0078] The specific structure and fabrication process of the second light-emitting element have been described above and will not be repeated here.

[0079] It is understood that the shape and positional distribution of one or more second monochrome display contents are determined by the overlapping region of the current diffusion layer and the multiple quantum well layer in each second light-emitting element.

[0080] Obviously, since a second light-emitting area includes only one second light-emitting element, the display content formed by the light emitted by the second light-emitting area is determined by the overlapping area of ​​the current diffusion layer and the multiple quantum well layer in the second light-emitting element. That is, the display content formed by the light emitted by the overlapping area of ​​the current diffusion layer and the multiple quantum well layer is the second monochrome display content formed by the second light-emitting area, and the location of the overlapping area of ​​the current diffusion layer and the multiple quantum well layer is the formation location corresponding to the second monochrome display content.

[0081] In one possible example, the N-type material layer of each second light-emitting element can be separated, while the P-type electrode layer can be shared, thus forming a common anode among the second light-emitting elements. It is understood that for each second light-emitting region, each can independently form a P-type electrode layer, and each can be connected to an external power source; alternatively, all second light-emitting regions can form a single, integrated P-type electrode layer, with at least one second light-emitting region connected to an external power source. This is not a limitation of this disclosure.

[0082] Please see the appendix Figure 6 The diagram shown is a structural schematic of a second light-emitting element provided in one embodiment of this disclosure, comprising:

[0083] Substrate 21;

[0084] Buffer layer 22 is stacked on substrate 21;

[0085] P-type electrode layer 27, a region stacked on buffer layer 22;

[0086] A current diffusion layer 26 is stacked on the P-type electrode layer 27;

[0087] P-type material layer 25 is stacked on current diffusion layer 26;

[0088] A multi-quantum-well layer 24 is stacked on a p-type material layer 25;

[0089] An N-type material layer 23 is stacked on all the multiple quantum well layers 24.

[0090] In one embodiment, a second light-emitting region may include multiple second light-emitting elements as described in the above schematic diagram; that is, each second light-emitting region can be fabricated individually or together. The cathodes of multiple second light-emitting elements within a second light-emitting region are composed of a single N-type material layer, or the cathodes of multiple second light-emitting elements within multiple second light-emitting regions are all composed of a single N-type material layer. Its structure, from bottom to top, may be a substrate, a buffer layer, a P-type electrode layer, a current diffusion layer, a P-type material layer, a multiple quantum well layer, and an N-type material layer. Each second light-emitting element is interconnected; for example, the anodes of all second light-emitting elements within a second light-emitting region are interconnected by connecting the P-type electrode layer of at least one second light-emitting element to the drain of an external power supply, for example, by connecting the P-type electrode layer of at least one second light-emitting element to the drain of an external power supply via gold wire. The N-type material layer forms a common cathode connected to the source. Exemplarily, the external power supply can be provided by a device mounted on the display device, such as a circuit board connected to the device via an FPC (Flexible Printed Circuit). The substrate material can be sapphire, with aluminum oxide (Al₂O₃), silicon (Si), gallium nitride (GaN), or gallium arsenide (GaAs) as its main components. Depending on the second monochromatic color displayed by the second display unit, the material of the multiple quantum well layer may also differ. For example, indium gallium nitride (InGaN) or gallium nitride (GaN) is used to fabricate green / blue Micro-LED / QLED / OLED / LED arrays, while aluminum gallium indium phosphide (AlGaInP) or gallium arsenide (GaAs) is used to fabricate red Micro-LED / QLED / OLED / LED arrays.

[0091] It can be understood that the shape and positional distribution of one or more second monochrome display contents are determined by the combination of overlapping regions of the current diffusion layer and the multiple quantum well layer in the multiple second light-emitting elements.

[0092] It can be understood that holes emitted from the P-type material layer and electrons emitted from the N-type material layer combine in the multi-quantum well layer to achieve light emission. Therefore, the actual light-emitting part of each second light-emitting element is the multi-quantum well layer. The current diffusion layer determines the current path that can enter the P-type material layer and also determines which regions in the multi-quantum well layer are the main light-emitting sites. Therefore, for each second light-emitting region, the overlapping area of ​​the current diffusion layer and the multi-quantum well layer of all the second light-emitting elements within it determines the shape formed after light emission, that is, it determines the second monochromatic display content that the second light-emitting region can form. The positional distribution of the overlapping area of ​​the current diffusion layer and the multi-quantum well layer determines the position of the second monochromatic display content emitted by the second light-emitting region.

[0093] For example, in one second light-emitting area, the shape formed by the overlapping region of the current diffusion layer and the multiple quantum well layer in each second light-emitting element after emitting light is a triangle; in another second light-emitting area, the shape formed by the overlapping region of the current diffusion layer and the multiple quantum well layer in each second light-emitting element after emitting light is a circle; and in yet another second light-emitting area, the shape formed by the overlapping region of the current diffusion layer and the multiple quantum well layer in each second light-emitting element after emitting light is a cross. And each multiple quantum well layer emits red light. Then, the three second monochrome display contents finally displayed by the second display unit are a red triangle, a red circle, and a red cross.

[0094] In another embodiment, a second light-emitting region includes a second light-emitting element as described in the above schematic diagram. Each second light-emitting region can be fabricated individually or collectively. Multiple second light-emitting elements constitute multiple second light-emitting regions, ultimately forming the entire second display unit. In this case, the P-type electrode layer of each second light-emitting element serves as the anode connected to the drain of an external power supply, and the N-type material layer serves as the common cathode connected to the source of each second light-emitting element.

[0095] It is understood that the shape and positional distribution of one or more second monochrome display contents are determined by the overlapping region of the current diffusion layer and the multiple quantum well layer in each second light-emitting element.

[0096] Obviously, since a second light-emitting area includes only one second light-emitting element, the display content formed by the light emitted by the second light-emitting area is determined by the overlapping area of ​​the current diffusion layer and the multiple quantum well layer in the second light-emitting element. That is, the display content formed by the light emitted by the overlapping area of ​​the current diffusion layer and the multiple quantum well layer is the second monochrome display content formed by the second light-emitting area, and the location of the overlapping area of ​​the current diffusion layer and the multiple quantum well layer is the formation location corresponding to the second monochrome display content.

[0097] In one possible example, the N-type material layer of each second light-emitting element can be separated, while the P-type electrode layer can be shared, thus forming a common anode among the second light-emitting elements. It is understood that for each second light-emitting region, each can independently form a P-type electrode layer, and each can be connected to an external power source; alternatively, all second light-emitting regions can form a single, integrated P-type electrode layer, with at least one second light-emitting region connected to an external power source. This is not a limitation of this disclosure.

[0098] For example, one or more second monochrome display contents displayed by the second display unit can be referred to the appendix. Figure 7The diagram illustrates one embodiment of color-combined display content provided in this disclosure. For example, the second light-emitting area is distributed along the upper edge of the second display unit and includes three second light-emitting areas. The emitted patterns are triangles, crosses, and circles, and the pixel unit emits red light. The first monochrome display content emitted by the first display unit is a green cloud. After color combination via a prism, the color-combined display result is triangles, crosses, and circles filled with diagonal lines near the upper boundary, and a cloud in the middle. The triangles, crosses, and circles filled with diagonal lines represent red triangles, red crosses, and red circles, respectively, while the dotted clouds represent green clouds as the first monochrome display content.

[0099] In one embodiment, please refer to the appendix. Figure 8 The diagram shown is a schematic diagram of a display device provided in an embodiment of the present disclosure. The display device further includes a third display unit 104, which forms a second angle with the first display unit 101 and is distributed relative to the second display unit 102. The third display unit 104 emits one or more third monochrome display contents.

[0100] For example, the third display unit 104 may include one or more third light-emitting areas, each third light-emitting area includes one or more third light-emitting elements, and all the third light-emitting elements included in each third light-emitting area are configured to be driven uniformly.

[0101] It is understood that the aforementioned third light-emitting area and third light-emitting element can refer to the aforementioned second light-emitting area and second light-emitting element, and will not be repeated here. Of course, the aforementioned third display unit can have the same or different structure as the second display unit. For example, the third light-emitting area of ​​the third display unit includes one third light-emitting element, while the second light-emitting area of ​​the second display unit includes multiple second light-emitting elements. The third light-emitting element is Micro-LED, and the second light-emitting element is OLED, etc. This does not constitute a limitation of this disclosure.

[0102] It is understandable that in the case of a first display unit, a second display unit, and a third display unit, each display unit emits a different color of light. For example, the first display unit emits green light, the second display unit emits red light, and the third display unit can emit blue light.

[0103] For example, the second display unit emits display content in the shape of a triangle, cross, or circle, and the distribution of the above patterns is located at the upper edge of the entire light-emitting area of ​​the second display unit. The third unit emits blue light to form a blue pattern, for example, a trapezoidal or pentagonal pattern, located at the lower edge of the entire light-emitting area of ​​the third display unit. The first display unit emits a first monochrome display content of green clouds. Figure 9The image shown is a second schematic diagram of color-combined display content provided in one embodiment of this disclosure. After color combination by a prism, the display result is triangles, crosses, and circles filled with diagonal lines near the upper boundary, trapezoids and pentagons filled with vertical stripes near the lower boundary, and a cloud in the center. Specifically, the triangles, crosses, and circles filled with diagonal lines represent red triangles, red crosses, and red circles, respectively; the cloud filled with dots represents green clouds, which represent the first monochrome display content; and the trapezoids and pentagons filled with vertical stripes represent yellow trapezoids and yellow pentagons, respectively, which represent the second monochrome display content.

[0104] It is understood that the third display unit described in the embodiments of this disclosure can obviously emit one or more first monochrome display contents, which is not a limitation of this disclosure.

[0105] The optical engine provided in the embodiments of this disclosure will be described below. The optical engine described below can be referred to in correspondence with the display device described above.

[0106] Figure 10 This is one of the top views of the internal structure of an optical engine provided in one embodiment of the present disclosure, as shown below. Figure 10 As shown, the optical engine includes a first display unit, a second display unit, a prism group, and a lens group; that is, the optical engine includes the aforementioned display device and lens group. The light corresponding to the first monochrome display content emitted by the first display unit is represented by a dashed arrow, and the light corresponding to the second monochrome display content emitted by the second display unit is represented by a solid arrow. The prism group consists of prism 1, prism 2, prism 3, and prism 4. The reflective surfaces of prism 1 and prism 4 corresponding to the second display unit can be coated to improve the reflectivity of the light corresponding to the second monochrome display content emitted by the second display unit. The transmissive surfaces of prism 1 to prism 4 corresponding to the first display unit can be coated to improve the transmittance of the color displayed by the light corresponding to the first monochrome display content emitted by the first display unit. The first display unit can be driven by a CMOS driving backplane or a TFT driving backplane for the first light-emitting element included in the first display unit. The first display unit and the second display unit are perpendicularly distributed to each other. One or more first monochrome display contents emitted by the first display unit and one or more second monochrome display contents emitted by the second display unit are combined by the prisms, and the lens group allows the combined color display content emitted by the prism group to be emitted through the lens group.

[0107] Specifically, the first light-emitting element in the first display unit can be a pixel unit, and each pixel unit is configured to be driven independently, for example, independently emitting light or de-emitting light (not emitting light) to emit one or more first monochrome display contents, characterized by high pixel density units. The second display unit includes one or more second light-emitting areas, and each light-emitting area includes one or more second light-emitting elements, and the one or more light-emitting elements in the second light-emitting area as a whole emit light or de-emitting light (de-emitting light). For example, the one or more second monochrome display contents emitted by the second display unit can be simple geometric shapes, including common dot shapes, line shapes, triangles, circles, cross shapes, rectangles, etc., and can also be various irregular shapes, or text, numbers, characters, etc., or combinations thereof. The color of these display contents is determined by the second monochrome of the corresponding second display unit, and the colors of the light emitted by the first display unit and the second display unit are different.

[0108] For example, the first display unit and the second display unit can be distributed on mutually perpendicular planes. Of course, the first display unit and the second display unit can also form a non-perpendicular angle, such as less than 90 degrees or greater than 90 degrees. The aforementioned first monochrome and second monochrome both represent a single color. After the different color display content displayed by the first display unit and the second display unit is combined by prisms, the display content emitted by the prism group can be emitted through the lens group. The optomechanism described in the embodiments of this disclosure can emit display content including multiple different colors, which can provide both high-definition patterns and display content with warning colors (such as red).

[0109] In this embodiment, the first monochrome display content provided by the first display unit, where the first light-emitting element is independently emitting light or not emitting light, and the second monochrome display content provided by the second display unit, where one or more second light-emitting elements in the second light-emitting area are as a whole, are combined by a prism to form a composite color display content. Since each light-emitting element of the first display unit can be driven individually by a driving circuit, the first monochrome display content emitted by the first display unit has the characteristics of high resolution and high contrast. Each light-emitting element in the second light-emitting area of ​​the second display unit is uniformly lit or not lit, and the emitted second monochrome display content (e.g., a red light pattern) can meet the requirement of providing a warning function. The first display unit and the second display unit are distributed at a first angle, and the prism group is located between the first display unit and the second display unit, which constitutes the display device of this disclosure.

[0110] In some embodiments, the first display unit further includes a driving backplane, wherein each driving circuit in the driving backplane is used to drive different first light-emitting elements to independently emit light or cancel light emission, and the driving backplane includes a CMOS driving backplane or a TFT driving backplane.

[0111] In some embodiments, the second light-emitting area includes a second light-emitting element, which is connected to an external power source.

[0112] In some embodiments, the second light-emitting element includes:

[0113] Substrate;

[0114] Buffer layers, stacked on the substrate;

[0115] N-type material layers are stacked on the buffer layer;

[0116] A multi-quantum-well layer, a region stacked on an N-type material layer;

[0117] P-type material layers are stacked on a multi-quantum-well layer;

[0118] A current diffusion layer is stacked on a P-type material layer;

[0119] P-type electrode layers are stacked on the current diffusion layer;

[0120] In this design, the P-type electrode layer of each second light-emitting element serves as the anode connected to an external power source, and the N-type material layer serves as the common cathode of each second light-emitting element.

[0121] In some embodiments, the second light-emitting element includes:

[0122] Substrate;

[0123] Buffer layers, stacked on the substrate;

[0124] A P-type electrode layer, a region stacked on a buffer layer;

[0125] A current diffusion layer is stacked on a P-type electrode layer;

[0126] P-type material layers are stacked on the current diffusion layer;

[0127] Multiple quantum well layers are stacked on a P-type material layer;

[0128] N-type material layers are stacked on all multi-quantum-well layers;

[0129] In this design, the P-type electrode layer of each second light-emitting element serves as the anode connected to an external power source, and the N-type material layer serves as the common cathode of each second light-emitting element.

[0130] In some embodiments, the overlapping region of the current diffusion layer and the multiple quantum well layer in each second light-emitting element determines the shape and location of the light emission formation in the second light-emitting region.

[0131] In some embodiments, the second light-emitting area includes a plurality of second light-emitting elements, an array of the plurality of second light-emitting elements forms the second light-emitting area, and the plurality of second light-emitting elements are interconnected and connected to an external power source.

[0132] In some embodiments, the second light-emitting element includes:

[0133] Substrate;

[0134] Buffer layers, stacked on the substrate;

[0135] N-type material layers are stacked on the buffer layer;

[0136] A multi-quantum-well layer, a region stacked on an N-type material layer;

[0137] P-type material layers are stacked on a multi-quantum-well layer;

[0138] A current diffusion layer is stacked on a P-type material layer;

[0139] P-type electrode layers are stacked on the current diffusion layer;

[0140] In this system, the P-type electrode layer of at least one second light-emitting element in each second light-emitting region serves as the anode and is connected to an external power source, while the N-type material layer serves as the common cathode for all second light-emitting elements.

[0141] In some embodiments, the second light-emitting element includes:

[0142] Substrate;

[0143] Buffer layers, stacked on the substrate;

[0144] A P-type electrode layer, a region stacked on a buffer layer;

[0145] A current diffusion layer is stacked on a P-type electrode layer;

[0146] P-type material layers are stacked on the current diffusion layer;

[0147] Multiple quantum well layers are stacked on a P-type material layer;

[0148] N-type material layers are stacked on all multi-quantum-well layers;

[0149] In this system, the P-type electrode layer of at least one second light-emitting element in each second light-emitting region serves as the anode and is connected to an external power source, while the N-type material layer serves as the common cathode for all second light-emitting elements.

[0150] In some embodiments, the overlapping region of the current diffusion layer and the multiple quantum well layer in the plurality of second light-emitting elements determines the shape and location of the light emission formation in the second light-emitting region.

[0151] In some embodiments, the optical engine further includes a third display unit, which is at a second angle to the first display unit and is distributed relative to the second display unit. The third display unit includes one or more third light-emitting areas, each third light-emitting area includes one or more third light-emitting elements, and all the third light-emitting elements included in each third light-emitting area are configured to be uniformly driven.

[0152] Figure 11 This is a second top view of the internal structure of an optical engine according to an embodiment of the present disclosure, as shown in the figure. Figure 11 As shown, the optical engine includes a first display unit, a second display unit, a third display unit, a prism group, and a lens group. The light rays corresponding to the first monochrome display content emitted by the first display unit are represented by dashed arrows, the light rays corresponding to the second monochrome display content emitted by the second display unit are represented by solid arrows, and the light rays corresponding to the third monochrome display content emitted by the third display unit are represented by dotted arrows. The dashed, solid, and dotted arrows represent different colors of light. The prism group consists of prism 1, prism 2, prism 3, and prism 4. The reflective surfaces of prisms 1 and 4, corresponding to the second display unit emitting solid arrow rays, can be coated to improve the reflectivity of the light rays corresponding to the second monochrome display content emitted by that second display unit. Similarly, the reflective surfaces of prisms 1 and 3, corresponding to the third display unit emitting dotted arrow rays, can be coated to improve the reflectivity of the light rays corresponding to the second monochrome display content emitted by that third display unit. The transmissive surfaces of prisms 1 to 4, corresponding to the first display unit, can be coated to improve the transmittance of the colors displayed by the light rays corresponding to the first monochrome display content emitted by the first display unit.

[0153] It should be noted that the optical engine provided in this disclosure includes the display device provided in any of the above embodiments. The color-combined display content formed by the display device can be magnified and displayed to the user at a certain distance (e.g., on the display screen of a wearable device) through a lens group.

[0154] This disclosure also provides a wearable device, which may include: the optical engine described in this disclosure, and may further include a processor, a communication interface, a memory, and a communication bus, wherein the optical engine, processor, communication interface, and memory communicate with each other through the communication bus. The processor can call logical instructions in the memory, in conjunction with the optical engine, to realize the display of color-combined display content on the wearable device.

[0155] The wearable device could be, for example, AR (Augmented Reality) glasses, VR (Virtual Reality) glasses, AR-HUB (Automotive Head-Up Display), etc.

[0156] Furthermore, when the logical instructions in the aforementioned memory can be implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this disclosure, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this disclosure. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0157] In this embodiment of the present disclosure, the wearable device includes an optical engine provided in this embodiment of the present disclosure, and the optical engine includes a display device provided in this embodiment of the present disclosure. Therefore, the wearable device has the advantages of a display device, having both high resolution and high contrast in the first monochrome display content emitted by the first display unit in the display device, and second monochrome display content emitted by the second display unit, which can meet the need for providing a warning function. The display device composed of the first display unit, the second display unit, and the prism group also conforms to user habits.

[0158] This disclosure also provides a display method, which is implemented based on the display device provided in this disclosure. Figure 12 This is a flowchart illustrating a display method provided in one embodiment of the present disclosure, as shown below. Figure 12 As shown, it specifically includes:

[0159] Step 1201: Drive the first display unit of the display device to emit one or more first monochrome display contents;

[0160] Step 1202: Drive the second display unit of the display device to emit one or more second monochrome display contents;

[0161] Step 1203: One or more first monochrome display contents and one or more second monochrome display contents pass through the prism assembly of the display device to form composite color display contents.

[0162] On the other hand, this disclosure also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer is able to execute the display methods provided in the above-described method embodiments, the method including:

[0163] The first display unit of the driving display device emits one or more first monochrome display contents;

[0164] The second display unit driving the display device emits one or more second monochrome display contents.

[0165] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0166] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0167] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A display device, characterized by comprising: include: A first display unit includes a first light-emitting area, which includes a plurality of first light-emitting elements, each of which is configured to be driven independently; the first display unit emits one or more first monochrome display contents. The second display unit is distributed at a first angle to the first display unit. The second display unit includes one or more second light-emitting areas, each second light-emitting area includes multiple second light-emitting elements, and all the second light-emitting elements included in each second light-emitting area are configured to be uniformly driven. The second display unit emits one or more second monochrome display contents. A prism group is located between the first display unit and the second display unit, and the prism group receives one or more first monochrome display contents and one or more second monochrome display contents to form composite color display contents; The array of multiple second light-emitting elements forms the second light-emitting area, and the multiple second light-emitting elements are interconnected and connected to an external power source.

2. The display device according to claim 1, wherein The first display unit further includes a driving backplane, wherein each driving circuit in the driving backplane is used to drive different first light-emitting elements to independently emit light or cancel light emission, and the driving backplane includes a CMOS driving backplane or a TFT driving backplane.

3. The display device according to claim 1, wherein The second light-emitting element includes: Substrate; A buffer layer, stacked on the substrate; An N-type material layer is stacked on the buffer layer; A multi-quantum-well layer, stacked on a region of the N-type material layer; A P-type material layer is stacked on the multi-quantum-well layer; A current diffusion layer is stacked on the P-type material layer; P-type electrode layers are stacked on the current diffusion layer; In this configuration, the P-type electrode layer of at least one second light-emitting element in each second light-emitting region serves as the anode and is connected to an external power source, while the N-type material layer serves as the common cathode for all the second light-emitting elements.

4. The display device according to claim 1, wherein The second light-emitting element includes: Substrate; A buffer layer, stacked on the substrate; A P-type electrode layer, stacked on a region of the buffer layer; A current diffusion layer is stacked on the P-type electrode layer; A P-type material layer is stacked on the current diffusion layer; Multiple quantum well layers are stacked on the P-type material layer; An N-type material layer is stacked on all of the aforementioned multiple quantum well layers; In this configuration, the P-type electrode layer of at least one second light-emitting element in each second light-emitting region serves as the anode and is connected to an external power source, while the N-type material layer serves as the common cathode for all the second light-emitting elements.

5. A display device according to claim 3 or 4, characterised in that, The overlapping region of the current diffusion layer and the multiple quantum well layer in the multiple second light-emitting elements determines the shape and location of the light emission formation in the second light-emitting region.

6. The display device according to claim 1, wherein The display device further includes a third display unit, which forms a second angle with the first display unit and is distributed relative to the second display unit. The third display unit includes one or more third light-emitting areas, each of the third light-emitting areas includes one or more third light-emitting elements, and all the third light-emitting elements included in each of the third light-emitting areas are configured to be uniformly driven.

7. An optical engine characterized by, The device includes the display device according to any one of claims 1 to 6, and a lens group that allows light emitted from the prism group to be emitted through the lens group.

8. A wearable device, comprising: Includes the optical engine as described in claim 7.

9. A display method realized based on the display apparatus according to any one of claims 1 to 6, characterized by, include: The first display unit of the display device is driven to emit one or more first monochrome display contents; The second display unit driving the display device emits one or more second monochrome display contents; One or more of the first monochrome display content and one or more of the second monochrome content pass through the prism assembly of the display device to form composite color display content.

Images