LED display panel, display and near-eye imaging system

Abstract

The invention provides an LED display panel, a display and a near-to-eye imaging system, and the LED display panel achieves the effect of red, green and blue full-color display in a light emitting area of a single blue light chip through the combination of a mixed wavelength conversion unit and a cholesteric liquid crystal assembly. The mixed wavelength conversion unit partially covers a light emitting area of the blue light chip, so that part of blue light is converted into red light and green light, the remaining blue light is directly emitted, and full-color display of a single blue light chip area is realized by matching with a cholesteric grating formed by the cholesteric liquid crystal component, sequentially transmitting the red light, the green light and the blue light in a short time and combining power control of the blue light chip. The resolution ratio of the display panel is greatly improved, and the requirements of high-end applications such as projectors and AR glasses for the hyperfine display effect are met. The pixel structure is simplified, the pixel size is reduced, and improvement of the pixel density is facilitated.

Description

Technical Field

[0001] The present application relates to the technical field of display panels, and in particular to an LED display panel, a display, and a near-eye imaging system. Background Art

[0002] With the rapid development of display technology, full-color micro-LED display technology using quantum dot materials has gradually become a research hotspot in the display field due to its significant advantages such as high brightness, high contrast and long life. This technology integrates multiple blue LED chips in a single pixel and cleverly combines red and green quantum dot materials for wavelength conversion to achieve efficient and accurate color presentation. Specifically, each pixel is usually equipped with three blue LED chips, two of which are respectively equipped with a red quantum dot conversion unit and a green quantum dot conversion unit to generate the required three primary colors of light, thereby synthesizing a full-color image.

[0003] However, in high-end application scenarios such as projector light sources and AR glasses light sources, the resolution requirements for displays are extremely demanding. These applications not only require extremely high pixel density to ensure the fineness and clarity of the image, but also require complex optical path design and light effect optimization in a compact space. In existing micro-LED display technology, each pixel needs to be configured with multiple LED chips and corresponding quantum dot conversion units, which greatly limits the further reduction of pixel size and the increase of pixel density, and thus cannot meet the pursuit of ultra-fine display effects for applications such as projectors and AR glasses. Summary of the invention

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

[0005] The embodiment of the present application is implemented as follows:

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

[0007] A first display backplane, wherein the first display backplane comprises a first display driving circuit;

[0008] Blue light chips are arranged in an array on the first display backplane and are electrically connected to the first display driving circuit and are lit up under the drive of the first display driving circuit;

[0009] A light-blocking baffle wall is disposed around each of the blue light chips on the first display backplane, and the area enclosed by each of the light-blocking baffle walls is the light-emitting area corresponding to the blue light chip;

[0010] A hybrid wavelength conversion unit is arranged in the light emitting direction of the blue light chip, wherein the hybrid wavelength conversion unit contains a mixture of red light quantum dot material and green light quantum dot material, and is used to convert the corresponding blue light beam emitted by the blue light chip into a red light beam and a green light beam; the coverage area ratio of the hybrid wavelength conversion unit to the corresponding light emitting area is less than a first preset ratio;

[0011] The cholesteric liquid crystal component comprises a lower electrode layer, a cholesteric liquid crystal layer and an upper electrode layer stacked in sequence. The cholesteric liquid crystal layer forms cholesteric gratings of different forms under the drive of different electric fields, and transmits red light beams, green light beams and blue light beams in sequence.

[0012] It can be understood that in the LED display panel disclosed in the present application, the hybrid wavelength conversion unit can convert the blue light beam emitted by the blue light chip into a red light beam and a green light beam. Since the coverage area of ​​the hybrid wavelength conversion unit is smaller than the coverage area of ​​the blue light chip light-emitting area, only part of the blue light beam is successfully converted, and the remaining blue light beam will be directly emitted. Therefore, the light-emitting area of ​​a single blue light chip will produce red, green and blue light. By forming cholesteric gratings of different forms through cholesteric liquid crystal components, red light beams, green light beams and blue light beams are sequentially transmitted in a short time, and the lighting power of the blue light chip is controlled, the red, green and blue pixels can be sequentially lit in the light-emitting area of ​​a single blue light chip to realize red, green and blue full-color display. Due to the principle of visual residual, when the human eye views the LED display panel, it will regard the full-color pixel as presented by the light-emitting area of ​​a single blue light chip. This greatly reduces the area of ​​a single full-color pixel in the display panel and further improves the resolution of the display panel.

[0013] In an optional embodiment of the present application, the ratio of the coverage area of ​​the hybrid wavelength conversion unit to the light output area of ​​the corresponding blue light chip is less than a second preset ratio.

[0014] In an optional embodiment of the present application, the lower electrode layer and the upper electrode layer are both composed of a single-piece electrode; after applying a first voltage to the lower electrode layer and the upper electrode layer, a first electric field is formed between the lower electrode layer and the upper electrode layer, and the cholesteric liquid crystal layer forms a first form of cholesteric grating driven by the first electric field, which transmits a red light band and reflects light beams in other bands; after applying a second voltage to the lower electrode layer and the upper electrode layer, a second electric field is formed between the lower electrode layer and the upper electrode layer, and the cholesteric liquid crystal layer forms a second form of cholesteric grating driven by the second electric field, which transmits a green light band and reflects light beams in other bands; after applying a third voltage to the lower electrode layer and the upper electrode layer, a third electric field is formed between the lower electrode layer and the upper electrode layer, and the cholesteric liquid crystal layer forms a third form of cholesteric grating driven by the third electric field, which transmits a blue light band and reflects light beams in other bands.

[0015] It can be understood that in this embodiment, the lower electrode layer and the upper electrode layer are both composed of a single electrode. When realizing full-color display, the single frame duration can be divided into three time periods, and the first voltage, the second voltage and the third voltage are applied to the upper and lower electrode layers respectively. In addition, in these three time periods, the lighting power of the blue light chip is controlled according to the display brightness of the red pixels, green pixels and blue pixels respectively, so as to realize full-color picture display of the entire LED display panel within a single frame duration.

[0016] In an optional embodiment of the present application, the lower electrode layer includes a first lower electrode and a second lower electrode arranged adjacent to each other, each of the first lower electrodes is arranged in the corresponding orthographic projection area of ​​the light emitting area, and each of the second lower electrodes is arranged in the corresponding orthographic projection area of ​​the light blocking wall; the upper electrode layer includes a first upper electrode and a second upper electrode arranged adjacent to each other, each of the first upper electrodes is arranged corresponding to the first lower electrode, and the first upper electrode just covers the orthographic projection area of ​​the first lower electrode, and each of the second upper electrodes is arranged corresponding to the second lower electrode, and the second upper electrode just covers the orthographic projection area of ​​the second lower electrode.

[0017] Optionally, after applying a fourth voltage to the first lower electrode and the first upper electrode, a fourth electric field is formed between the first lower electrode and the first upper electrode, and the cholesteric liquid crystal layer forms a fourth form of cholesteric grating under the drive of the fourth electric field, which transmits a red light band and reflects light beams in other bands; after applying a fifth voltage to the first lower electrode and the first upper electrode, a fifth electric field is formed between the first lower electrode and the first upper electrode, and the cholesteric liquid crystal layer forms a fifth form of cholesteric grating under the drive of the fifth electric field, which transmits a green light band and reflects light beams in other bands; After a sixth voltage is applied to the first lower electrode and the first upper electrode, a sixth electric field is formed between the first lower electrode and the first upper electrode, and the cholesteric liquid crystal layer forms a sixth form of cholesteric grating driven by the sixth electric field, which transmits the blue light band and reflects light beams in other bands; after a seventh voltage is applied to the second lower electrode and the second upper electrode, a seventh electric field is formed between the second lower electrode and the second upper electrode, and the cholesteric liquid crystal layer forms a seventh form of cholesteric grating driven by the seventh electric field, and reflects light beams in the red light band, the green light band and the blue light band at the same time.

[0018] It can be understood that in this embodiment, the lower electrode layer is composed of a plurality of first lower electrodes and a plurality of second lower electrodes, and the upper electrode layer is composed of a plurality of first upper electrodes and a plurality of second upper electrodes. When realizing full-color display, the single frame duration can be divided into three time periods, and the fourth voltage, the fifth voltage and the sixth voltage are applied to the corresponding first upper and lower electrodes respectively. In addition, in these three time periods, the lighting power of the blue light chip is controlled according to the display brightness of the red pixel, the green pixel and the blue pixel respectively, so as to realize the full-color display of each pixel point within the single frame duration. In addition, during the display process, it is also necessary to apply the seventh voltage to the corresponding second upper and lower electrodes, so that the cholesteric liquid crystal layer corresponding to the second upper and lower electrodes forms a seventh form of cholesteric grating, reflects the image light beam, and plays a role in preventing cross-talk.

[0019] In an optional embodiment of the present application, the above-mentioned LED display panel also includes: a first light-transmitting encapsulation adhesive layer, coated on the first display back panel and flush with the top surface of the blue light chip and the light-blocking baffle; a light-transmitting filling layer, covering the light-transmitting encapsulation adhesive layer, and the mixed wavelength conversion unit is arranged on the light-transmitting filling layer; a water-oxygen barrier layer, covering the light-transmitting encapsulation adhesive layer and wrapping each of the mixed wavelength conversion units; a second light-transmitting encapsulation adhesive layer, coated on the water-oxygen barrier layer, and the cholesteric liquid crystal component is arranged on the second light-transmitting encapsulation adhesive layer.

[0020] Optionally, the LED display panel further comprises: a light-transmitting cover plate, covering the cholesteric liquid crystal component.

[0021] Optionally, the LED display panel further comprises: a light-blocking dam, which is arranged on the water-oxygen barrier layer around each of the mixed wavelength conversion units; the light-blocking dam is arranged corresponding to the light-blocking wall, and the light-blocking dam just covers the positive projection area of ​​the light-blocking wall.

[0022] In an optional embodiment of the present application, a microlens array is further provided on the light emitting path of the blue light chip, and the area covered by each microlens coincides with the light emitting area of ​​the blue light chip. It can be understood that the setting of the microlens can shrink the light emitting angle of each blue light chip, which is more conducive to high-resolution performance and more suitable for use as a light source for augmented reality (AR) glasses.

[0023] In a second aspect, the present application provides a display, comprising a first area and a second area;

[0024] The first area is the LED display panel as described in any one of the first aspects;

[0025] The second area includes: a second display backplane, the second display backplane includes a second display driving circuit; light-emitting units, which are arranged in an array on the second display backplane and are electrically connected to the second display driving circuit, and are lit under the drive of the second display driving circuit, and at least three adjacent light-emitting chips emit light beams of different bands, and the at least three light-emitting units constitute a single full-color display pixel.

[0026] It can be understood that in the above display, the resolution of the first area is higher than that of the second area. In normal display, the display mode of the first area can be adjusted independently to reduce the resolution of the first area to be consistent with the resolution of the second area. When projection is required, the high-resolution display mode of the first area is restored, and the pre-designed projection lens is installed in the light emitting direction of the first area to project the image beam displayed in the first area to achieve the projection effect.

[0027] In a third aspect, the present application provides a near-eye imaging system, comprising an LED display panel as described in any one of the first aspects, a coupling lens, a waveguide, and a coupling unit and a coupling unit arranged on the waveguide; an image source light beam initially set by the LED display panel enters the coupling unit after being shaped by the coupling lens, the coupling unit changes the propagation direction of the image source light beam so that it is fully reflected and transmitted in the waveguide, and then the image source light beam is coupled out from the waveguide to the human eye through the coupling unit.

[0028] It can be understood that improving the image source resolution of near-eye display systems such as AR glasses can bring significant beneficial effects. First, high-resolution image sources can present more delicate and clear pictures, enhance the user's visual experience, and make virtual images more naturally integrated with the real environment. Secondly, high resolution means more pixels and finer image details, which is crucial for information display and interactive operations in augmented reality applications, and can enhance user immersion and interaction efficiency. Finally, high-resolution image sources can also help reduce image jaggedness and blur, improve the overall image quality, and enable users to maintain a comfortable viewing experience even when wearing AR glasses for a long time.

[0029] Beneficial effects:

[0030] The present application provides a high-resolution LED display panel, which realizes the effect of presenting a full-color display of red, green and blue in the light-emitting area of ​​a single blue light chip by combining a hybrid wavelength conversion unit with a cholesteric liquid crystal component. The hybrid wavelength conversion unit partially covers the light-emitting area of ​​the blue light chip, so that part of the blue light is converted into red and green light, and the remaining blue light is directly emitted. The cholesteric grating formed by the cholesteric liquid crystal component sequentially transmits red, green and blue light in a short time, and combined with the power control of the blue light chip, a full-color display of a single blue light chip area is realized. This greatly improves the resolution of the display panel, meets the requirements of high-end applications such as projectors and AR glasses for ultra-fine display effects; simplifies the pixel structure, reduces the pixel size, and is conducive to improving the pixel density.

[0031] The present application also provides a display with high and low resolution areas, which is divided into a first area and a second area, wherein the first area adopts the above-mentioned LED display panel, and realizes high-resolution full-color display by mixing wavelength conversion units and cholesteric liquid crystal components; while the second area adopts a traditional light-emitting unit array to present images at a lower resolution. In normal display, the display mode of the first area can be independently adjusted as needed to make its resolution consistent with that of the second area to meet daily use needs. When projection is required, the high-resolution display mode of the first area can be restored, and a projection lens can be installed to project the image of the first area, thereby achieving a high-definition projection effect.

[0032] The present application also provides a near-eye imaging system, comprising the above-mentioned LED display panel, a coupling lens, a waveguide, and a coupling unit and an outcoupling unit arranged on the waveguide. Improving the image source resolution of near-eye display systems such as AR glasses can significantly improve the clarity and realism of virtual images and enhance user experience.

[0033] In order to make the above-mentioned objects, features and advantages of the present application more obvious and understandable, optional embodiments are specifically listed below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 It is a structural schematic diagram of an LED display panel provided by the present application;

[0036] Figure 2 It is a structural schematic diagram of another LED display panel provided by the present application;

[0037] Figure 3 This is a structural schematic diagram of another LED display panel provided by the present application;

[0038] Figure 4 It is a structural schematic diagram of a display provided by the present application;

[0039] Figure 5 yes Figure 4 A schematic diagram of the structure of the second area;

[0040] Figure 6 It is a structural schematic diagram of a near-eye imaging system provided in this application. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] First, as Figure 1 As shown, the present application provides an LED display panel, which includes: a first display backplane 1, a plurality of blue light chips 2, a light-blocking wall 3, a hybrid wavelength conversion unit 4 and a cholesteric liquid crystal component 5.

[0043] like Figure 1 As shown, the first display backplane 1 includes a substrate 11, a circuit layer 12 and a planarization layer 13 which are stacked in sequence, wherein a first display driving circuit is arranged on the circuit layer 12, including thin film transistors TFT, gate lines, signal lines and other components, which are used to drive each blue light chip 2 to light up and control the lighting power of the blue light chip 2.

[0044] The substrate 11 may include a transparent glass material, such as silicon dioxide (SiO2). The substrate 11 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), triacetyl cellulose (TAC) or cellulose propionate (CAP) and other organic materials.

[0045] The planarization layer 13 covers the circuit layer 12, and can eliminate the step difference on the circuit layer 12 and make it planar. The planarization layer 13 may include an organic material, such as polymethyl methacrylate (PMMA) or polystyrene (PS), a polymer derivative having a phenolic group, an propylene polymer, an imide polymer, an aromatic ether polymer, an amide polymer, a fluorine polymer, a p-xylene polymer, a vinyl alcohol polymer, or any combination thereof.

[0046] Figure 1 Only three blue light chips 2 are shown. In fact, more blue light chips 2 are arranged in an array on the first display backplane 1 and are electrically connected to the first display driving circuit and are lit up under the drive of the first display driving circuit. The blue light chip 2 can be a micro light emitting diode (Micro-LED) chip, and its size is usually between 1 and 100 microns. Micro-LED chips have the advantages of self-luminescence, high efficiency, low power consumption, high brightness, high contrast, fast response time, long life and high stability. These characteristics make Micro-LED chips a strong competitor for the next generation of display technology, and are expected to provide users with a better visual experience.

[0047] like Figure 1 As shown, the light-blocking baffle 3 is arranged around each blue light chip 2 on the first display back plate 1, and the area enclosed by each light-blocking baffle 3 is the light-emitting area of ​​the corresponding blue light chip 2. The light-blocking baffle 3 can be made of black plastic material, which can be made of organic resin and pigments such as carbon black. Through its excellent light-shielding performance, it ensures that light is transmitted only in a predetermined area, and has a good effect of preventing light leakage.

[0048] like Figure 1 As shown, the hybrid wavelength conversion unit 4 is arranged in the light-emitting direction of the blue light chip 2, and the hybrid wavelength conversion unit 4 contains a mixture of red light quantum dot material and green light quantum dot material, and is used to convert the blue light beam emitted by the corresponding blue light chip 2 into a red light beam and a green light beam; the coverage area ratio of the hybrid wavelength conversion unit 4 to the corresponding light-emitting area is less than the first preset ratio, that is, the coverage area of ​​the hybrid wavelength conversion unit 4 is less than the coverage area of ​​the light-emitting area of ​​the blue light chip 2, and only part of the blue light beam is successfully converted, and the remaining blue light beam will be directly emitted, so the light-emitting area of ​​a single blue light chip 2 will generate red, green and blue light. Optionally, the coverage area ratio of the hybrid wavelength conversion unit 4 to the light-emitting area of ​​the corresponding blue light chip 2 is less than the second preset ratio, that is, the coverage area of ​​the hybrid wavelength conversion unit 4 is less than the coverage area of ​​the light-emitting area of ​​the blue light chip 2, which further reduces the blue light portion converted by wavelength, so that more blue light is directly emitted.

[0049] like Figure 1As shown, the cholesteric liquid crystal component 5 includes a lower electrode layer 51, a cholesteric liquid crystal layer 52 and an upper electrode layer 53 stacked in sequence. The cholesteric liquid crystal layer 52 forms cholesteric gratings of different forms under the drive of different electric fields, and transmits red light beams, green light beams and blue light beams in sequence.

[0050] It can be understood that in the LED display panel disclosed in the present application, the hybrid wavelength conversion unit 4 can convert the blue light beam emitted by the blue light chip 2 into a red light beam and a green light beam. Since the coverage area of ​​the hybrid wavelength conversion unit 4 is smaller than the coverage area of ​​the light-emitting area of ​​the blue light chip 2, only part of the blue light beam is successfully converted, and the remaining blue light beam will be directly emitted. Therefore, the light-emitting area of ​​a single blue light chip 2 will produce red, green and blue light. The cholesteric gratings of different forms are formed by the cholesteric phase liquid crystal component 5, and the red light beam, the green light beam and the blue light beam are sequentially transmitted in a short time. In conjunction with the control of the lighting power of the blue light chip 2, the red, green and blue pixels can be sequentially lit in the light-emitting area of ​​a single blue light chip 2 to realize red, green and blue full-color display. Due to the principle of visual residual, when the human eye views the LED display panel, it will regard the full-color pixel as presented by the light-emitting area of ​​a single blue light chip 2. This greatly reduces the area of ​​a single full-color pixel in the display panel and further improves the resolution of the display panel.

[0051] In an optional embodiment of the present application, Figure 1 As shown, the lower electrode layer 51 and the upper electrode layer 53 are both composed of a single-piece electrode; after a first voltage is applied to the lower electrode layer 51 and the upper electrode layer 53, a first electric field is formed between the lower electrode layer 51 and the upper electrode layer 53, and the cholesteric liquid crystal layer 52 forms a first form of cholesteric grating driven by the first electric field, which transmits the red light band and reflects light beams of other bands; after a second voltage is applied to the lower electrode layer 51 and the upper electrode layer 53, a second electric field is formed between the lower electrode layer 51 and the upper electrode layer 53, and the cholesteric liquid crystal layer 52 forms a second form of cholesteric grating driven by the second electric field, which transmits the green light band and reflects light beams of other bands; after a third voltage is applied to the lower electrode layer 51 and the upper electrode layer 53, a third electric field is formed between the lower electrode layer 51 and the upper electrode layer 53, and the cholesteric liquid crystal layer 52 forms a third form of cholesteric grating driven by the third electric field, which transmits the blue light band and reflects light beams of other bands.

[0052] It can be understood that in this embodiment, the lower electrode layer 51 and the upper electrode layer 53 are both composed of a single electrode. When realizing full-color display, the single frame duration can be divided into three time periods, and the first voltage, the second voltage and the third voltage are applied to the upper and lower electrode layers 51 respectively. In addition, in these three time periods, the lighting power of the blue light chip 2 is controlled according to the display brightness of the red pixels, the green pixels and the blue pixels respectively, so as to realize the full-color picture display of the entire LED display panel within the single frame duration.

[0053] In an optional embodiment of the present application, Figure 2 As shown, the lower electrode layer 51 includes a first lower electrode 511 and a second lower electrode 512 arranged adjacent to each other, each first lower electrode 511 is arranged in the orthographic projection area of ​​the corresponding light emitting area, and each second lower electrode 512 is arranged in the orthographic projection area of ​​the corresponding light blocking wall 3; the upper electrode layer 53 includes a first upper electrode 513 and a second upper electrode 514 arranged adjacent to each other, each first upper electrode 513 is arranged corresponding to the first lower electrode 511, and the first upper electrode 513 just covers the orthographic projection area of ​​the first lower electrode 511, and each second upper electrode 514 is arranged corresponding to the second lower electrode 512, and the second upper electrode 514 just covers the orthographic projection area of ​​the second lower electrode 512.

[0054] Optionally, after a fourth voltage is applied to the first lower electrode 511 and the first upper electrode 513, a fourth electric field is formed between the first lower electrode 511 and the first upper electrode 513, and the cholesteric liquid crystal layer 52 is driven by the fourth electric field to form a cholesteric grating of a fourth form, which transmits the red light band and reflects light beams of other bands; after a fifth voltage is applied to the first lower electrode 511 and the first upper electrode 513, a fifth electric field is formed between the first lower electrode 511 and the first upper electrode 513, and the cholesteric liquid crystal layer 52 is driven by the fifth electric field to form a cholesteric grating of a fifth form, which transmits the green light band and reflects light beams of other bands; After the sixth voltage is applied to the lower electrode 511 and the first upper electrode 513, a sixth electric field is formed between the first lower electrode 511 and the first upper electrode 513, and the cholesteric liquid crystal layer 52 is driven by the sixth electric field to form a sixth form of cholesteric grating, which transmits the blue light band and reflects light beams in other bands; after the seventh voltage is applied to the second lower electrode 512 and the second upper electrode 514, a seventh electric field is formed between the second lower electrode 512 and the second upper electrode 514, and the cholesteric liquid crystal layer 52 is driven by the seventh electric field to form a seventh form of cholesteric grating, which simultaneously reflects light beams in the red light band, the green light band and the blue light band.

[0055] It can be understood that in this embodiment, the lower electrode layer 51 is composed of a plurality of first lower electrodes 511 and a plurality of second lower electrodes 512, and the upper electrode layer 53 is composed of a plurality of first upper electrodes 513 and a plurality of second upper electrodes 514. When realizing full-color display, the single frame duration can be divided into three time periods, and the fourth voltage, the fifth voltage and the sixth voltage are applied to the corresponding first upper and lower electrodes respectively. In addition, in these three time periods, the lighting power of the blue light chip 2 is controlled according to the display brightness of the red pixel, the green pixel and the blue pixel respectively, so as to realize the full-color display of each pixel point within the single frame duration. In addition, during the display process, it is also necessary to apply the seventh voltage to the corresponding second upper and lower electrodes, so that the cholesteric liquid crystal layer 52 corresponding to the second upper and lower electrodes forms a seventh form of cholesteric grating, reflects the image light beam, and plays a role in preventing cross-talk.

[0056] In the optional embodiment of the present application, continue to refer to Figure 1 and Figure 2 , the above-mentioned LED display panel also includes:

[0057] The first light-transmissive encapsulation adhesive layer 6 is coated on the first display back plate 1 and is flush with the top surfaces of the blue light chip 2 and the light-blocking walls 3 .

[0058] The light-transmitting filling layer 7 covers the light-transmitting packaging adhesive layer, and the hybrid wavelength conversion unit 4 is arranged on the light-transmitting filling layer 7; the material of the light-transmitting filling layer 7 can be acrylic resin, polyimide, poly(p-phenylene benzobisoxazole), silica gel, etc.

[0059] The water and oxygen barrier layer 8 covers the transparent packaging glue layer and wraps each mixed wavelength conversion unit 4. The water and oxygen barrier layer 8 mainly adopts at least one of the following materials: SiO2, Al2O3, TiO2, etc., which plays a role in blocking water and oxygen.

[0060] The second light-transmitting packaging adhesive layer 9 is coated on the water and oxygen barrier layer 8 , and the cholesteric liquid crystal component 5 is disposed on the second light-transmitting packaging adhesive layer 9 .

[0061] The first light-transmitting encapsulating adhesive layer 6 and the second light-transmitting encapsulating adhesive layer 9 are both light-transmitting adhesive materials, and can be the same material or different materials.

[0062] Optionally, continue to refer to Figure 1 and Figure 2 The LED display panel further includes: a light-transmitting cover plate 10 as a protective layer, and the light-transmitting cover plate 10 covers the cholesteric liquid crystal component 5 .

[0063] Optionally, continue to refer to Figure 2 The above-mentioned LED display panel also includes: a light-blocking dam 61, which is arranged on the water-oxygen barrier layer 8 around each mixed wavelength conversion unit 4; the light-blocking dam 61 is arranged corresponding to the light-blocking baffle wall 3, and the light-blocking dam 61 just covers the positive projection area of ​​the light-blocking baffle wall 3.

[0064] In an optional embodiment of the present application, Figure 3 As shown, a microlens array 54 is also provided on the light emitting path of the blue light chip 2, and the area covered by each microlens coincides with the light emitting area of ​​the blue light chip 2. It can be understood that the setting of the microlens can shrink the light emitting angle of each blue light chip 2, which is more conducive to high-resolution performance and more suitable for use as a light source for augmented reality (AR) glasses.

[0065] Second, as Figure 4As shown, the present application provides a display 100, including a first area 101 and a second area 102; the first area 101 is an LED display panel as described in any one of the first aspects; the second area 102 includes: a second display backplane including a second display driving circuit and light-emitting units arranged in an array on the second display backplane. The light-emitting unit array is arranged on the second display backplane and is electrically connected to the second display driving circuit. When driven by the second display driving circuit, the light-emitting units are lit. At least three adjacent light-emitting chips emit light beams of different wavelengths. At least three light-emitting units constitute a single full-color display pixel.

[0066] It can be understood that in the above display, the resolution of the first area 101 is higher than that of the second area 102. In normal display, the display mode of the first area 101 can be adjusted independently to reduce the resolution of the first area 101 to be consistent with the resolution of the second area 102. When projection is required, the high-resolution display mode of the first area 101 is restored, and the pre-designed projection lens is installed in the light-emitting direction of the first area 101 to project the image beam displayed in the first area 101 to achieve the projection effect. As shown in the figure, the first area 101 is located at the edge of the entire display 100, and the second area 102 half surrounds the first area 101. Such a design makes it easier to install the projection lens in the light-emitting direction of the first area 101 to achieve the projection mode.

[0067] like Figure 5 Shown is Figure 4 A structural embodiment of the second region 102 in the embodiment of the present invention, the second region 102 includes a second display backplane 20 having a structure similar to that of the first display backplane 1, a plurality of blue LED chips 30, a plurality of first wavelength conversion units 40, and a plurality of second wavelength conversion units 50. The first wavelength conversion unit 40 is mixed with a red light quantum dot material for converting a blue light beam emitted by a corresponding blue light LED chip 30 into a red light beam; the second wavelength conversion unit 50 is mixed with a green light quantum dot material for converting a blue light beam emitted by a corresponding blue light LED chip 30 into a green light beam. Figure 5 Only three blue LED chips 30 belonging to a single full-color display pixel are shown. In fact, more blue LED chips 30 arrays are used. Figure 5 The pattern shown is arranged on the second display backplane 20 and is electrically connected to the second display driving circuit and is lit when driven by the second display driving circuit.

[0068] In a third aspect, the present application provides a near-eye imaging system, comprising an LED display panel 61, a coupling lens 62, a waveguide 63, and a coupling unit 64 and a coupling unit 65 arranged on the waveguide 63 as in any one of the first aspect; the image source light beam initially set by the LED display panel enters the coupling unit 64 after being shaped by the coupling lens 62, the coupling unit 64 changes the propagation direction of the image source light beam so that it is fully reflected and transmitted in the waveguide 63, and then the image source light beam is coupled out from the waveguide 63 to the human eye through the coupling unit 65.

[0069] It can be understood that improving the image source resolution of near-eye display systems such as AR glasses can bring significant beneficial effects. First, high-resolution image sources can present more delicate and clear pictures, enhance the user's visual experience, and make virtual images more naturally integrated with the real environment. Secondly, high resolution means more pixels and finer image details, which is crucial for information display and interactive operations in augmented reality applications, and can enhance user immersion and interaction efficiency. Finally, high-resolution image sources can also help reduce image jaggedness and blur, improve the overall image quality, and enable users to maintain a comfortable viewing experience even when wearing AR glasses for a long time.

[0070] The expressions "first", "second", "the first" or "the second" used in various embodiments of the present disclosure may modify various components regardless of order and / or importance, but these expressions do not limit the corresponding components. The above expressions are only configured for the purpose of distinguishing an element from other elements. For example, a first user device and a second user device represent different user devices, although both are user devices. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element without departing from the scope of the present disclosure.

[0071] When one element (e.g., a first element) is referred to as being "(operably or communicatively) coupled" or "(operably or communicatively) coupled to" or "connected to" another element (e.g., a second element), it is understood that the one element is directly connected to the other element or the one element is indirectly connected to the other element via yet another element (e.g., a third element). Conversely, it is understood that when an element (e.g., a first element) is referred to as being "directly connected" or "directly coupled" to another element (the second element), no element (e.g., a third element) is interposed between the two.

[0072] It should be noted that, in this article, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element. In addition, components, features, and elements with the same name in different embodiments of the present application may have the same meaning or different meanings, and their specific meanings need to be determined by their explanation in the specific embodiment or further combined with the context of the specific embodiment.

[0073] The above description is only an optional embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above invention concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

[0074] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0075] The above description is only an optional embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above invention concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

[0076] The above description is only an optional embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An LED display panel, characterized in that: include: A first display backplane, wherein the first display backplane comprises a first display driving circuit; Blue light chips are arranged in an array on the first display backplane and are electrically connected to the first display driving circuit and are lit up under the drive of the first display driving circuit; A light-blocking baffle wall is disposed around each of the blue light chips on the first display backplane, and the area enclosed by each of the light-blocking baffle walls is the light-emitting area corresponding to the blue light chip; A hybrid wavelength conversion unit is arranged in the light emitting direction of the blue light chip, wherein the hybrid wavelength conversion unit contains a mixture of red light quantum dot material and green light quantum dot material, and is used to convert the corresponding blue light beam emitted by the blue light chip into a red light beam and a green light beam; the coverage area ratio of the hybrid wavelength conversion unit to the corresponding light emitting area is less than a first preset ratio; The cholesteric liquid crystal component comprises a lower electrode layer, a cholesteric liquid crystal layer and an upper electrode layer stacked in sequence. The cholesteric liquid crystal layer forms cholesteric gratings of different forms under the drive of different electric fields, and transmits red light beams, green light beams and blue light beams in sequence.

2. The LED display panel according to claim 1, characterized in that: The lower electrode layer and the upper electrode layer are both composed of a single electrode; After a first voltage is applied to the lower electrode layer and the upper electrode layer, a first electric field is formed between the lower electrode layer and the upper electrode layer, and the cholesteric liquid crystal layer is driven by the first electric field to form a first form of cholesteric grating, which transmits a red light band and reflects light beams in other bands; After applying a second voltage to the lower electrode layer and the upper electrode layer, a second electric field is formed between the lower electrode layer and the upper electrode layer, and the cholesteric liquid crystal layer is driven by the second electric field to form a second form of cholesteric grating, which transmits a green light band and reflects light beams of other bands; After applying a third voltage to the lower electrode layer and the upper electrode layer, a third electric field is formed between the lower electrode layer and the upper electrode layer. Driven by the third electric field, the cholesteric liquid crystal layer forms a third form of cholesteric grating, which transmits the blue light band and reflects light beams in other bands.

3. The LED display panel according to claim 1, characterized in that: The lower electrode layer comprises a first lower electrode and a second lower electrode arranged adjacent to each other, each of the first lower electrodes is arranged in the orthographic projection area of ​​the corresponding light emitting area, and each of the second lower electrodes is arranged in the orthographic projection area of ​​the corresponding light blocking wall; The upper electrode layer includes a first upper electrode and a second upper electrode arranged adjacent to each other, each of the first upper electrodes is arranged corresponding to the first lower electrode, and the first upper electrode just covers the positive projection area of ​​the first lower electrode, and each of the second upper electrodes is arranged corresponding to the second lower electrode, and the second upper electrode just covers the positive projection area of ​​the second lower electrode.

4. The LED display panel according to claim 3, characterized in that: After a fourth voltage is applied to the first lower electrode and the first upper electrode, a fourth electric field is formed between the first lower electrode and the first upper electrode, and the cholesteric liquid crystal layer is driven by the fourth electric field to form a fourth form of cholesteric grating, which transmits a red light band and reflects light beams in other bands; After a fifth voltage is applied to the first lower electrode and the first upper electrode, a fifth electric field is formed between the first lower electrode and the first upper electrode, and the cholesteric liquid crystal layer is driven by the fifth electric field to form a fifth form of cholesteric grating, which transmits a green light band and reflects light beams of other bands; After a sixth voltage is applied to the first lower electrode and the first upper electrode, a sixth electric field is formed between the first lower electrode and the first upper electrode, and the cholesteric liquid crystal layer is driven by the sixth electric field to form a cholesteric grating of a sixth form, which transmits a blue light band and reflects light beams of other bands; After applying the seventh voltage to the second lower electrode and the second upper electrode, a seventh electric field is formed between the second lower electrode and the second upper electrode, and the cholesteric liquid crystal layer forms a seventh form of cholesteric grating under the driving of the seventh electric field, and simultaneously reflects the red light band light beam, the green light band light beam and the blue light band light beam.

5. The LED display panel according to any one of claims 1 to 4, characterized in that: The ratio of the coverage area of ​​the hybrid wavelength conversion unit to the light emitting area of ​​the corresponding blue light chip is smaller than a second preset ratio.

6. The LED display panel according to any one of claims 1 to 4, characterized in that: Also includes: A first light-transmitting encapsulation adhesive layer is coated on the first display back panel and is flush with the top surfaces of the blue light chip and the light-blocking baffle wall; A light-transmitting filling layer is covered on the light-transmitting encapsulation adhesive layer, and the hybrid wavelength conversion unit is arranged on the light-transmitting filling layer; a water and oxygen barrier layer, covering the light-transmitting encapsulation adhesive layer and encapsulating each of the hybrid wavelength conversion units; The second light-transmitting packaging adhesive layer is coated on the water-oxygen barrier layer, and the cholesteric liquid crystal component is arranged on the second light-transmitting packaging adhesive layer.

7. The LED display panel according to claim 6, characterized in that: It also includes: a light-blocking dam, which is arranged on the water-oxygen barrier layer around each of the mixed wavelength conversion units; the light-blocking dam is arranged corresponding to the light-blocking wall, and the light-blocking dam just covers the positive projection area of ​​the light-blocking wall.

8. The LED display panel according to any one of claims 1 to 4, characterized in that: A microlens array is also arranged on the light emitting path of the blue light chip, and the area covered by each microlens coincides with the light emitting area of ​​the blue light chip.

9. A display, characterized in that: including a first region and a second region; The first area is the LED display panel according to any one of claims 1 to 8; The second area includes: a second display backplane, wherein the second display backplane comprises a second display driving circuit; The light-emitting units are arranged in an array on the second display backplane and are electrically connected to the second display driving circuit. They are lit up under the drive of the second display driving circuit. At least three adjacent light-emitting chips emit light beams of different bands. The at least three light-emitting units constitute a single full-color display pixel.

10. A near-eye imaging system, characterized in that: The LED display panel comprises a coupling lens, a waveguide, and a coupling unit and a coupling unit disposed on the waveguide; The image source light beam initially set by the LED display panel enters the coupling unit after being shaped by the coupling lens. The coupling unit changes the propagation direction of the image source light beam so that it is fully reflected and transmitted in the waveguide. The image source light beam is then coupled out of the waveguide to the human eye through the coupling unit.

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