An image source device of an LED display panel and a near-eye imaging system

Abstract

The application discloses an LED display panel and an image source device of a near-eye imaging system. The LED display panel can be directly used as the image source device of the near-eye imaging system of AR glasses and is arranged before an in-coupling lens assembly. In the LED display panel, each LED chip is arranged in a single groove, and the center point of the light-emitting layer of the LED chip is located on the focal point of a parabolic surface. After the divergent light beams emitted by the LED chip are reflected by the reflecting material on the groove surface, the light beams are emitted in a direction perpendicular to a display circuit board, so that the emission angle of the LED chip is reduced as much as possible, and the collimation difficulty of the in-coupling lens assembly is reduced. In addition, a transparent gel with a large refractive index is arranged on the light-emitting light path of the LED chip, and the transparent gel is used for guiding the emitted light beams of each LED chip to a same target position, so that the light condensing design difficulty of the in-coupling lens assembly is further reduced.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to an image source device for an LED display panel and a near-eye imaging system. Background Technology

[0002] There are currently several implementation schemes for near-eye imaging systems in AR glasses, with waveguide imaging being the mainstream research approach. In waveguide imaging, the near-eye imaging system includes an image source, a coupled-in lens assembly, and a waveguide. The surface of the waveguide is etched with coupled-in gratings and coupled-out gratings. The image beam emitted from an image source device such as a Micro-LED display is guided by the coupled-in lens assembly to the coupled-in grating position in the waveguide. After passing through the coupled-in grating, the beam undergoes an angular deflection and propagates through total internal reflection within the waveguide until it is coupled out of the waveguide by the coupled-out grating and enters the human eye.

[0003] In a Micro-LED display, the light emitted by each LED chip is divergent, but the beam propagated by total internal reflection in the waveguide must be parallel. Therefore, when a Micro-LED display is used as the image source device in a near-eye imaging system, it needs to be collimated by an incident lens assembly and the collimated beams of each pixel need to be converged to the same spot position so that the incident grating can be guided into the waveguide. This poses a significant challenge to the design of the incident lens assembly. Summary of the Invention

[0004] The purpose of this application is to provide an image source device for an LED display panel and a near-eye imaging system, which can improve the above-mentioned problems.

[0005] The embodiments of this application are implemented as follows:

[0006] In a first aspect, this application provides an LED display panel, comprising:

[0007] A display circuit board, on which control electrode disks are arranged in an array;

[0008] An insulating planarization layer is provided on the display circuit board. The insulating planarization layer has an array of grooves on its surface opposite to the display circuit board. Each groove has an opening at its bottom that communicates with a corresponding single control electrode disk. The surface of the groove is provided with a reflective material.

[0009] Each LED chip is disposed in a single recess, and the first electrode of the LED chip is soldered to the control electrode disk through the opening. The center point of the light-emitting layer of the LED chip is located at the focal point of the parabola.

[0010] A common electrode is disposed on the surface of the insulating planarization layer opposite to the display circuit board, and the common electrode is soldered to the second electrode of each LED chip.

[0011] It is understood that this application discloses an LED display panel, which can be directly used as an image source device for the near-eye imaging system of AR glasses, and is positioned in front of the incident lens assembly. In this LED display panel, each LED chip is disposed in a single parabolic groove, and the center point of the light-emitting layer of the LED chip is located at the focal point of the parabola. The divergent light beam emitted from the LED chip is reflected by the reflective material on the surface of the groove and then emitted in a direction perpendicular to the display circuit board, minimizing the emission angle of the LED chip, reducing the collimation difficulty of the incident lens assembly, and even eliminating the need to consider the collimation function when designing the incident lens assembly, greatly reducing the design requirements of the incident lens assembly.

[0012] In an optional embodiment of this application, the parabolic surface is the shape formed by rotating the target parabola 180 degrees around its axis of symmetry, and the target parabola can be represented by the following formula:

[0013] y = x 2 / 4f-f;

[0014] Where x represents the coordinate in a first direction parallel to the display circuit board, y represents the coordinate in a second direction perpendicular to the display circuit board, f represents the focal length of the target parabola, and the (x,y) coordinate represents the focus of the target parabola.

[0015] It is understandable that the center of the LED chip's emitting layer is located at the focal point of the parabolic surface where the groove is situated. Thus, any light ray emitted from the center of the chip's emitting layer will be reflected by the reflective material on the groove surface into collimated parallel light. Light beams emitted from locations other than the center of the chip's emitting layer, after being reflected by the reflective material on the groove surface, will also form an emitted beam with a smaller divergence angle, reducing the collimation difficulty of the incident lens assembly.

[0016] In an optional embodiment of this application, the common electrode is transparent, the orthogonal projection area of ​​the LED chip on the surface where the common electrode is located is a diverging area, and an array of ink pads are disposed on the surface of the common electrode away from the display circuit board, with each ink pad covering a single diverging area.

[0017] The common electrode can be an indium tin oxide (ITO) electrode. ITO is an n-type semiconductor material with high conductivity, high visible light transmittance, high mechanical hardness, and good chemical stability. It is the most commonly used thin-film material for transparent electrodes in liquid crystal displays (LCDs), plasma displays (PDPs), electroluminescent displays (EL / OLEDs), touch panels, solar cells, and other electronic instruments.

[0018] The common electrode can be a rigid electrode plate, placed on an insulating flat layer, covering all the grooves to seal the air inside the grooves; the common electrode can be a flexible electrode film, covering the insulating flat layer, with other transparent colloids filling the grooves, and the electrode film covering the transparent colloids.

[0019] It is understandable that the beam emitted directly from the divergence region has a large divergence angle, so it is necessary to cover the ink pad to block it, so that the beam emitted by the LED chip is as parallel and collimated as possible after being reflected by the groove.

[0020] Secondly, this application provides an image source device for a near-eye imaging system, comprising:

[0021] The first LED display panel and the second LED display panel are any one of the LED display panels described in the first aspect above;

[0022] A prism, wherein a first reflecting surface and a second reflecting surface are provided inside the prism, the first reflecting surface being used to reflect a first light beam emitted from the first LED display panel along the target direction to a target plane, and the second reflecting surface being used to reflect a second light beam emitted from the second LED display panel along the target direction to the target plane;

[0023] In the target plane, the pixel spots of the first LED display panel and the second LED display panel are arranged in an alternating pattern.

[0024] It is understandable that the design of the grooves on the insulating planarization layer increases the display area of ​​a single LED chip, which may reduce the resolution of the LED display panel. To ensure the overall resolution of the image source device in the near-eye imaging system, at least two LED display panels can be configured. After reflection by a prism, the emitted beams from at least two LED display panels are combined with pixel-shifted beams to increase the resolution of a single LED display panel and ensure the overall resolution of the image source device.

[0025] In optional embodiments of this application, the LED chip in the first LED display panel is a first LED chip, and the LED chip in the second LED display panel is a second LED chip. The first LED chip and the second LED chip include at least one of the following:

[0026] The light beams emitted by the first LED chip and the second LED chip are light beams of the same color but different wavelengths;

[0027] The first LED chip and the second LED chip emit light beams of different colors.

[0028] Thirdly, this application also discloses another type of LED display panel, which differs from the LED display panel disclosed in the first aspect in that: a transparent colloid with a refractive index greater than that of air is provided in the light path of the LED chip, and the transparent colloid is used to guide the emitted light beam of each LED chip to the same target position.

[0029] It is understandable that in the near-eye imaging system of AR glasses, not only is it required that the incident beam be collimated, but the incident beam also needs to be converged to the same spot position as much as possible. The spot position should ideally coincide with the incident grating etched on the waveguide surface, so that the coincidence of the incident grating can guide the parallel beams incident from all directions into the waveguide for total internal reflection propagation.

[0030] In an optional embodiment of this application, the axis perpendicular to the display circuit board and passing through the center point of the display circuit board is the central axis of the display circuit board, and the target position is located on the central axis; the surface of the transparent colloid facing away from the display circuit board is the working surface, the working surface is a curved surface, and the absolute value of the slope of the working surface gradually increases in the direction close to the central axis.

[0031] It is understandable that, due to the principle of refraction and deflection, a light beam emitted from a transparent colloid with a high refractive index will be deflected according to the shape of the colloid's surface as it travels into the air. By utilizing this principle of refraction and deflection and specially designing the absolute value of the slope of the transparent colloid away from the working surface of the display circuit board, the light beam emitted from any LED chip can be focused onto a specific spot on the central axis. This not only reduces the difficulty of collimation design for the incident lens assembly but also reduces the difficulty of focusing design for the incident lens assembly.

[0032] There are at least three design options for transparent colloids.

[0033] The first transparent colloid design method: the number of transparent colloids is the same as the number of display circuit boards, the transparent colloids are disposed on the surface of the common electrode facing away from the display circuit board, and the transparent colloids cover each ink pad.

[0034] The second transparent colloid design method: the number of transparent colloids is the same as the number of grooves; the groove is the orthogonal projection area of ​​the surface where the common electrode is located, the transparent colloid is disposed on the surface of the common electrode away from the display circuit board, and each transparent colloid covers the corresponding single groove area.

[0035] The third transparent colloid design method: the number of transparent colloids is the same as the number of grooves; each transparent colloid is disposed in a single groove, and the transparent colloid covers the light-emitting layer of the LED chip.

[0036] Beneficial effects:

[0037] This application discloses an LED display panel that can be directly used as an image source device for the near-eye imaging system of AR glasses, positioned before the incident lens assembly. In this LED display panel, each LED chip is disposed within a single recess, and the center point of the light-emitting layer of the LED chip is located at the focal point of the parabolic surface. The divergent light beam emitted from the LED chip is reflected by the reflective material on the surface of the recess and then emitted in a direction perpendicular to the display circuit board, minimizing the emission angle of the LED chip and reducing the collimation difficulty of the incident lens assembly. In fact, the incident lens assembly can be designed without considering the collimation function, greatly reducing the design requirements of the incident lens assembly.

[0038] The groove design on the insulating planarization layer increases the display area of ​​a single LED chip, which may reduce the resolution of the LED display panel. To ensure the overall resolution of the image source device in a near-eye imaging system, this application also discloses an image source device for a near-eye imaging system. This image source device is configured with at least two LED display panels. After reflection by a prism, the emitted beams from the at least two LED display panels are combined with pixel-shifted beams to increase the resolution of a single LED display panel and ensure the overall resolution of the image source device.

[0039] In near-eye imaging systems for AR glasses, not only is collimation required for the incident light beam, but it is also necessary to converge the incident light beam to the same spot position as much as possible. Ideally, this spot position should coincide with a coupled grating etched on the waveguide surface. This alignment allows parallel light beams incident from various directions to be guided into the waveguide for total internal reflection propagation. This application also discloses an LED display panel that utilizes the principle of refraction and deflection. By specially designing the absolute value of the slope of the transparent colloid away from the working surface of the display circuit board, the light beam emitted from any LED chip can be converged to a spot position on the central axis. This not only reduces the collimation design difficulty of the coupled lens assembly but also the light-gathering design difficulty.

[0040] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, optional embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of the principle of near-eye imaging system for AR glasses in the existing technology;

[0043] Figure 2 yes Figure 1 Enlarged view of the dashed box;

[0044] Figures 3 to 6 This is a schematic diagram illustrating the manufacturing process of the first type of LED display panel provided in this application;

[0045] Figure 7 yes Figure 6 An improved solution for the LED display panel is shown.

[0046] Figure 8 yes Figure 6 The diagram shows the collimation principle of the LED display panel.

[0047] Figure 9 This is a schematic diagram of the structure of an image source device for a near-eye imaging system provided in this application.

[0048] Figure 10 This is a structural schematic diagram of the second type of LED display panel provided in this application;

[0049] Figure 11 This is a structural schematic diagram of the third type of LED display panel provided in this application;

[0050] Figure 12 This is a structural schematic diagram of the fourth type of LED display panel provided in this application. Detailed Implementation

[0051] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0052] There are currently several implementation schemes for near-eye imaging systems in AR glasses, with waveguide imaging being the mainstream research approach. For example... Figure 1 As shown, the near-eye imaging system in the waveguide imaging scheme includes an image source 101, an incident lens assembly 102, and a waveguide 103. The surface of the waveguide 103 is etched with an incident grating 1031 and an incident exit grating 1032. For example... Figure 1 As shown, the above-described near-eye imaging system is applied to the left and right eye imaging of AR glasses. The image beam emitted from the image source 101 device such as a Micro-LED display is guided by the incident lens assembly 102 to the incident grating 1031 position of the waveguide 103, and then deflected at an angle after passing through the incident grating 1031. It then undergoes total internal reflection within the waveguide 103 until it is incidently exited by the incident grating 1032 and enters the human eye.

[0053] like Figure 2 As shown, in a Micro-LED display, the emitted light from each LED chip 16 is divergent. However, the beam propagated by total internal reflection in a waveguide must be parallel. Therefore, when a Micro-LED display is used as an image source device in a near-eye imaging system, it needs to be collimated by the incident lens assembly 102 and the collimated beams of each pixel converged to the same spot position 200 so that the incident grating 102 can be guided into the waveguide 103. This poses a significant challenge to the design of the incident lens assembly 102.

[0054] To address the aforementioned issues, this application discloses various image source devices for LED display panels and near-eye imaging systems.

[0055] Firstly, such as Figure 6 As shown, this application provides an LED display panel, which includes: a display circuit board 11, an insulating planarization layer 13, an LED chip 16, and a common electrode 17.

[0056] Display circuit board 11, on which control electrode disks 12 are arranged in an array. Display circuit board 11 may include a substrate and a circuit layer on the substrate. The substrate may include a transparent glass material, such as silicon dioxide (SiO2); the substrate may also include a transparent plastic material, such as polyethersulfone (PES), polyacrylate (PAR), polyetherimide (PEI), polyethylene terephthalate (PEN), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyarylate, polyimide, polycarbonate (PC), cellulose triacetate (TAC), or cellulose propionate (CAP), etc. The circuit layer includes driving circuits for driving LED chips, such as thin-film transistors (TFTs), gate lines, signal lines, etc.

[0057] An insulating planarization layer 13 covers the display circuit board 11. The surface of the insulating planarization layer 13 facing away from the display circuit board 11 has an array of grooves 14 arranged in a parabolic shape. Each groove 14 has an opening at its bottom that communicates with a corresponding individual control electrode disk 12. A reflective material 15 is disposed on the surface of the grooves 14. The insulating planarization layer 13 can eliminate step differences on the circuit layer, thus planarizing it. The insulating planarization layer 13 may include organic materials such as polymethyl methacrylate (PMMA) or polystyrene (PS), polymer derivatives with phenolic groups, propylene-based polymers, imide-based polymers, aryl ether-based polymers, amide-based polymers, fluoropolymers, p-xylylene-based polymers, vinyl alcohol-based polymers, or any combination thereof.

[0058] LED chips 16, each LED chip 16 is disposed in a single groove 14, and the first electrode 161 of the LED chip 16 is welded to the control electrode disk 12 through an opening, and the center point of the light-emitting layer of the LED chip 16 is located at the focus of the parabola.

[0059] An LED chip typically comprises a first electrode, a first semiconductor layer, a light-emitting layer, a second semiconductor layer, and a second electrode, stacked sequentially. The first semiconductor layer can be an N / P-type doped GaN layer, and the light-emitting layer can be a quantum well layer. The second semiconductor layer can be a P / N-type doped GaN layer. The first and second electrodes are made of conductive materials such as metals. When an electrical signal is applied to the first and second electrodes, electrons in the N-type semiconductor and holes in the P-type semiconductor collide and recombine violently in the light-emitting layer, generating photons and emitting energy in the form of photons. The materials of the first and second electrodes can include aluminum (Al), platinum (Pt), palladium (Pd), silver (Ag), magnesium (Mg), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), lithium (Li), calcium (Ca), molybdenum, titanium (Ti), tungsten (W), or copper (Cu), etc.

[0060] A common electrode 17 is disposed on the surface of the insulating planarization layer 13 away from the display circuit board 11, and the common electrode 17 is soldered to the second electrode 162 of each LED chip 16.

[0061] It is understood that this application discloses an LED display panel, which can be directly used as an image source device for the near-eye imaging system of AR glasses, and is placed in front of the incident lens assembly. In this LED display panel, each LED chip 16 is disposed in a single parabolic groove 14, and the center point of the light-emitting layer of the LED chip 16 is located at the focal point of the parabola. The divergent light beam emitted from the LED chip 16 is reflected by the reflective material 15 on the surface of the groove 14 and then emitted in a direction perpendicular to the display circuit board 11, thereby minimizing the emission angle of the LED chip 16, reducing the collimation difficulty of the incident lens assembly, and even eliminating the need to consider the collimation function when designing the incident lens assembly, greatly reducing the design requirements of the incident lens assembly.

[0062] In an optional embodiment of this application, the parabolic surface of the groove 14 is the shape formed by rotating the target parabola 180 degrees around its axis of symmetry. The target parabola can be represented by the following formula:

[0063] y = x 2 / 4f-f;

[0064] Where x represents the coordinate in the first direction parallel to the display circuit board 11, y represents the coordinate in the second direction perpendicular to the display circuit board 11, f represents the focal length of the target parabola, and the (x,y) coordinate represents the focus of the target parabola.

[0065] Understandable, such as Figure 8 As shown, the center point Q of the LED chip 16's emitting layer is located precisely at the focal point of the parabolic surface where the groove 14 is situated. Thus, any light ray emitted from the center of the chip's emitting layer will be reflected by the reflective material 15 on the surface of the groove 14, becoming collimated parallel light. Light beams emitted from non-central positions of the chip's emitting layer, after being reflected by the reflective material 15 on the surface of the groove 14, will also form an emitted beam with a small divergence angle, reducing the collimation difficulty of the incident lens assembly.

[0066] In an optional embodiment of this application, the common electrode 17 is transparent, and the orthographic projection area of ​​the LED chip 16 onto the surface of the common electrode 17 is a divergence region. An array of ink disks 18 is disposed on the surface of the common electrode 17 opposite to the display circuit board 11, with each ink disk 18 covering a single divergence region. Figure 7 As shown.

[0067] The common electrode 17 can be an indium tin oxide (ITO) electrode. ITO is an n-type semiconductor material with high conductivity, high visible light transmittance, high mechanical hardness, and good chemical stability. It is the most commonly used thin-film material for transparent electrodes in liquid crystal displays (LCDs), plasma displays (PDPs), electroluminescent displays (EL / OLEDs), touch panels, solar cells, and other electronic instruments.

[0068] The common electrode 17 can be a rigid electrode plate, placed on the insulating flat layer 13, covering all the grooves 14, so that the grooves 14 are sealed with air; the common electrode 17 can be a flexible electrode film, covering the insulating flat layer 13, with other transparent colloids filling the grooves 14, and the electrode film covering the transparent colloids.

[0069] It is understandable that the beam emitted directly from the divergence region has a large divergence angle, so it is necessary to cover the ink disk 18 to block it, so that the beam emitted by the LED chip 16 is as parallel and collimated as possible after being reflected by the groove 14.

[0070] The manufacturing process of the LED display panel provided by the first party is as follows: Figures 3 to 6 As shown.

[0071] like Figure 3 As shown, a display circuit board 11 is provided with an array of control electrode disks 12. An insulating planarization layer 13 is then coated on the surface of the display circuit board 11 on which the control electrode disks 12 are disposed, so that the insulating planarization layer 13 covers all the control electrode disks 12.

[0072] like Figure 4 As shown, a groove 14 is etched on the insulating planar layer 13, and the groove 14 is parabolic in shape.

[0073] like Figure 5 As shown, a layer of reflective material 15 is disposed within the groove 14 to form a reflective surface. Furthermore, an opening is made at the bottom of the groove 14 to expose the control electrode disk 12.

[0074] like Figure 6 As shown, an LED chip 16 is disposed within the groove 14, such that the center point of the light-emitting layer of the LED chip 16 is located at the focal point of the parabola. The first electrode 161 of the LED chip 16 is soldered to the corresponding control electrode disk 12. A common electrode 17 is disposed on the surface of the insulating planarization layer 13 facing away from the display circuit board 11, and the common electrode 17 is soldered to the second electrode 162 of each LED chip 16.

[0075] Secondly, such as Figure 9As shown, this application provides an image source device 300 for a near-eye imaging system, which includes: a prism 30, a first LED display panel 21, and a second LED display panel 22.

[0076] The first LED display panel 21 and the second LED display panel 22 are either of the LED display panels described in the first aspect above.

[0077] The prism 30 has a first reflecting surface and a second reflecting surface. The first reflecting surface is used to reflect the first light beam emitted from the first LED display panel 21 along the target direction to the target plane, and the second reflecting surface is used to reflect the second light beam emitted from the second LED display panel 22 along the target direction to the target plane. In the target plane, the pixel light spots of the first LED display panel 21 and the second LED display panel 22 are arranged alternately.

[0078] It is understandable that the design of the groove 14 on the insulating planarization layer 13 increases the display area of ​​a single LED chip 16, which may reduce the resolution of the LED display panel. In order to ensure the overall resolution of the image source device 300 of the near-eye imaging system, at least two LED display panels can be configured. After reflection by the prism 30, the outgoing beams of at least two LED display panels are combined with pixel-shifted beams to increase the resolution of a single LED display panel and ensure the overall resolution of the image source device 300.

[0079] In optional embodiments of this application, the LED chip in the first LED display panel 21 is a first LED chip, and the LED chip in the second LED display panel 22 is a second LED chip. The first LED chip and the second LED chip include at least one of the following:

[0080] The light beams emitted by the first LED chip and the second LED chip are light beams of the same color but different wavelengths; for example, the first LED display panel 21 is a green light display with a wavelength of 420-430nm, the second LED display panel 22 is a green light display with a wavelength of 450-460nm, and the prism 30 combines the two light beams with different wavelengths.

[0081] The light beams emitted by the first LED chip and the second LED chip are light beams of different colors; for example, the first LED display panel 21 is a red light display, and the second LED display panel 21 is a green light display.

[0082] Thirdly, this application also discloses another type of LED display panel, which differs from the LED display panel disclosed in the first aspect in that: a transparent colloid with a refractive index greater than that of air is provided in the light path of the LED chip 16, and the transparent colloid is used to guide the emitted light beam of each LED chip 16 to the same target position.

[0083] It is understandable that in the near-eye imaging system of AR glasses, not only is it required that the incident beam be collimated, but the incident beam also needs to be converged to the same spot position as much as possible. The spot position should ideally coincide with the incident grating etched on the waveguide surface, so that the coincidence of the incident grating can guide the parallel beams incident from all directions into the waveguide for total internal reflection propagation.

[0084] In an optional embodiment of this application, the axis perpendicular to the display circuit board 11 and passing through the center point of the display circuit board 11 is the central axis of the display circuit board 11, and the target position is located on the central axis; the surface of the transparent colloid facing away from the display circuit board 11 is the working surface, the working surface is a curved surface, and the absolute value of the slope of the working surface gradually increases in the direction close to the central axis.

[0085] It is understandable that, due to the principle of refraction and deflection, a light beam will be deflected according to the shape of the transparent colloid surface as it exits from a transparent colloid with a high refractive index into the air. By utilizing this principle of refraction and deflection and specially designing the absolute value of the slope of the transparent colloid away from the working surface of the display circuit board 11, the light beam emitted from any LED chip 16 can be focused onto a specific spot position on the central axis. This not only reduces the collimation design difficulty of the incident lens assembly but also reduces the light focusing design difficulty of the incident lens assembly.

[0086] There are at least three design options for transparent colloids.

[0087] The first type of transparent colloid design: such as Figure 10 As shown, the number of transparent colloids 50 is the same as the number of display circuit boards 11. The transparent colloids 50 are disposed on the surface of the common electrode 17 facing away from the display circuit board 11, and the transparent colloids cover each ink disk 18. The working surface 500 of the transparent colloids 50 is curved, and the absolute value of the slope of the working surface 500 gradually increases in the direction close to the central axis 400.

[0088] The second type of transparent colloid design: such as Figure 11As shown, the number of transparent colloids corresponds to the number of grooves. The figure shows six grooves and six transparent colloids: first groove 141, second groove 142, third groove 143, fourth groove 144, fifth groove 145, sixth groove 146, and first transparent colloid 51, second transparent colloid 52, third transparent colloid 53, fourth transparent colloid 54, fifth transparent colloid 5, and sixth transparent colloid 56. The groove area is the orthographic projection of the groove onto the surface of the common electrode 17. The transparent colloids are disposed on the surface of the common electrode 17 facing away from the display circuit board 11, and each transparent colloid covers its corresponding single groove 14 area. The working surface of the transparent colloid is curved, and the absolute value of the slope of the working surface gradually increases along the direction close to the central axis 400; as shown... Figure 11 As shown, the absolute value of the working surface slope of the third transparent colloid 53 is greater than that of the second transparent colloid 52, and the absolute value of the working surface slope of the second transparent colloid 52 is greater than that of the first transparent colloid 51; the absolute value of the working surface slope of the fourth transparent colloid 54 is greater than that of the fifth transparent colloid 55, and the absolute value of the working surface slope of the fifth transparent colloid 55 is greater than that of the sixth transparent colloid 56.

[0089] The third transparent colloid design: the number of transparent colloids is the same as the number of grooves 14; each transparent colloid is placed in a single groove 14, and the transparent colloid covers the light-emitting layer of the LED chip 16. For example... Figure 12 The diagram shows six grooves and six transparent colloids: groove 141, groove 142, groove 143, groove 144, groove 145, and groove 146; and transparent colloids 51, 52, 53, 54, 55, and 56. The working surface of each transparent colloid is curved, and the absolute value of its slope gradually increases along the direction close to the central axis 40°. Figure 12 As shown, the absolute value of the working surface slope of the third transparent colloid 53 is greater than that of the second transparent colloid 52, and the absolute value of the working surface slope of the second transparent colloid 52 is greater than that of the first transparent colloid 51; the absolute value of the working surface slope of the fourth transparent colloid 54 is greater than that of the fifth transparent colloid 55, and the absolute value of the working surface slope of the fifth transparent colloid 55 is greater than that of the sixth transparent colloid 56.

[0090] In the several embodiments provided in this application, it should be understood that the disclosed terminal devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of the units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices or units, or it may be an electrical, mechanical or other form of connection.

[0091] The units described above 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 units can be selected to achieve the purpose of the embodiments of the present invention, depending on actual needs.

[0092] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0093] The terms "first," "second," "first," or "second" as used in the various embodiments of this disclosure may modify various components regardless of their order and / or importance, but these terms do not limit the corresponding components. The above terms are configured only for the purpose of distinguishing an element from other elements. For example, "first user equipment" and "second user equipment" refer to different user equipments, although both are user equipment. For example, without departing from the scope of this disclosure, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

[0094] When a component (e.g., a first component) is referred to as being "(operably or communicatively) coupled" or "(operably or communicatively) coupled to" or "connected to" another component (e.g., a second component), it should be understood that the first component is directly connected to the second component or that the first component is indirectly connected to the second component via yet another component (e.g., a third component). Conversely, it can be understood that when a component (e.g., a first component) is referred to as being "directly connected" or "directly coupled" to another component (the second component), no component (e.g., a third component) is inserted between the two.

[0095] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, components, features, and elements with the same names in different embodiments of this application may have the same meaning or different meanings, the specific meaning of which must be determined by its interpretation in that specific embodiment or further in conjunction with the context of that specific embodiment.

[0096] The above description is merely an optional embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in this application.

[0097] Depending on the context, the words “if” or “suppose” as used here can be interpreted as “when” or “in response to determination” or “in response to detection.” Similarly, depending on the context, the phrases “if determination” or “if detection (of the stated condition or event)” can be interpreted as “when determination” or “in response to determination” or “when detection (of the stated condition or event)” or “in response to detection (of the stated condition or event).”

[0098] The above description is merely an optional embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in this application.

[0099] The above description is merely an optional embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An LED display panel, characterized in that, include: A display circuit board, on which control electrode disks are arranged in an array; An insulating planarization layer is provided on the display circuit board. The insulating planarization layer has an array of grooves arranged on its surface away from the display circuit board. The grooves are parabolic in shape. Each groove has an opening at its bottom that communicates with a corresponding single control electrode disk. The surface of the groove is provided with a reflective material. Each LED chip is disposed in a single recess, and the first electrode of the LED chip is soldered to the control electrode disk through the opening. The center point of the light-emitting layer of the LED chip is located at the focal point of the parabola. A common electrode is disposed on the surface of the insulating planarization layer opposite to the display circuit board, and the common electrode is soldered to the second electrode of each LED chip.

2. The LED display panel according to claim 1, characterized in that, The parabolic surface is the shape formed by rotating the target parabola 180° around its axis of symmetry, and the target parabola is represented by the following formula: ;in, Represents the coordinates in a first direction parallel to the display circuit board. Represents the coordinates in a second direction perpendicular to the display circuit board. The focal length represents the target parabola. The coordinates represent the focus of the target parabola.

3. The LED display panel according to claim 2, characterized in that, The common electrode is transparent, and the area of ​​the LED chip projected onto the surface of the common electrode is a diverging region. An array of ink pads is arranged on the surface of the common electrode away from the display circuit board, and each ink pad covers a single diverging region.

4. The LED display panel according to claim 3, characterized in that, A transparent colloid with a refractive index greater than that of air is disposed in the light output path of the LED chip. The transparent colloid is used to guide the emitted light beam of each LED chip to the same target position.

5. The LED display panel according to claim 4, characterized in that, An axis perpendicular to the display circuit board and passing through the center point of the display circuit board is the central axis of the display circuit board, and the target position is located on the central axis; The transparent colloid has a working surface facing away from the display circuit board. The working surface is curved, and the absolute value of the slope of the working surface gradually increases in the direction close to the central axis.

6. The LED display panel according to claim 5, characterized in that, The number of transparent colloids is the same as the number of display circuit boards. The transparent colloids are disposed on the surface of the common electrode facing away from the display circuit board, and the transparent colloids cover each ink pad.

7. The LED display panel according to claim 5, characterized in that, The number of transparent colloids is the same as the number of grooves; the groove is the orthogonal projection area of ​​the surface where the common electrode is located, the transparent colloid is disposed on the surface of the common electrode away from the display circuit board, and each transparent colloid covers the corresponding single groove area.

8. The LED display panel according to claim 5, characterized in that, The number of the transparent colloids is the same as the number of the grooves; each of the transparent colloids is disposed in a single groove, and the transparent colloids cover the light-emitting layer of the LED chip.

9. An image source device for a near-eye imaging system, characterized in that, include: The first LED display panel and the second LED display panel are LED display panels as described in any one of claims 1 to 3; A prism, wherein a first reflecting surface and a second reflecting surface are provided inside the prism, the first reflecting surface being used to reflect a first light beam emitted from the first LED display panel along the target direction to a target plane, and the second reflecting surface being used to reflect a second light beam emitted from the second LED display panel along the target direction to the target plane; In the target plane, the pixel spots of the first LED display panel and the second LED display panel are arranged in an alternating pattern.

10. The image source device of the near-eye imaging system according to claim 9, characterized in that, The LED chip in the first LED display panel is a first LED chip, and the LED chip in the second LED display panel is a second LED chip. The first LED chip and the second LED chip include at least one of the following: The light beams emitted by the first LED chip and the second LED chip are light beams of the same color but different wavelengths; The first LED chip and the second LED chip emit light beams of different colors.

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