Light-emitting module based on LED direct-display projection array, and display screen

Abstract

The present invention relates to the technical field of display. Disclosed are a light-emitting module based on an LED direct-display projection array, and a display screen. The light-emitting module comprises a video decoding driving board, a display unit driving board, a display unit, and an imaging unit from bottom to top. According to the present invention, semiconductor technology is used to integrate and miniaturize light sources which actively emit light to obtain integrated LED array chip as light-emitting sources, the light-emitting sources are directly controlled by circuits, and are magnified at a certain magnification by means of a magnification objective lens and according to application scene requirements, and each pixel is imaged and focused by means of a focusing lens. By means of the combination of the magnification lens and the focusing lens, under the condition that the light source intensity is sufficient, products of various sizes can be designed; moreover, display sources in the light-emitting module provided by the present application are integrated LED array chips, and the size of the light-emitting module is far less than that of an existing SMD and COB tiled block, so that when the light-emitting modules are tiled into a large screen, the tiling angle can be freely adjusted so as to obtain a flexible screen and a special-shaped screen.

Description

LED direct projection array light-emitting module and display screen Technical Field

[0001] This invention claims priority for a patent application submitted to the China Patent Office on June 28, 2023, with application number 202310775705.X, and the invention name is "A LED direct display projection array light-emitting module and display screen". It belongs to the field of display technology, and specifically relates to a LED direct display projection array light-emitting module and display screen. Background Art

[0002] In current monitors or display screens, the images seen by the human eye can be categorized as light directly displayed by pixels and images formed by pixels passing through optical devices. Simply put, direct display occurs when light from a light source passes through the display's structure and reaches the human eye directly. Examples include LCD (Liquid Crystal Display) and OLED smartwatches, laptop screens, televisions, and large LED / SMD / LED / COB screens. In contrast, LCD and DLP projection products use light from a light source passing through optical devices and then reflected from the screen to reach the human eye.

[0003] Direct display LCDs and OLEDs, due to their micron-level manufacturing processes, can achieve high pixel densities, reaching retinal levels (PPI approximately 300), making them suitable for smart wearables. However, both LCDs and OLEDs can achieve both pixel density and pixel size. Consequently, LCD and OLED direct display products are widely used in small smart wearable screens measuring a few inches (with retinal screens boasting a PPI of around 300), mid-sized computer monitors measuring over ten inches, and large LCD TVs measuring dozens of inches. However, these products struggle to clearly read the LCD screen at long distances or in bright backgrounds, and are not suitable for large screens exceeding 100 inches.

[0004] The main reason why it cannot be used in strong light backgrounds or outdoors is the low brightness: LCD is a non-autonomous luminous display technology. Its principle is to use the electric field to change the deflection of the arrangement state of liquid crystal molecules to determine the amount of light emitted by the white backlight source, that is, the red, green, and blue color filters on the liquid crystal unit selectively retain the R, G, and B light, and finally these three RGB colors form color pixels. Since liquid crystal itself does not emit light, and the liquid crystal deflects and selectively emits light and has polarization and color filter filtering structures, the system's ultimate utilization rate of the backlight source is extremely low, and the overall system light efficiency is less than 10%. Low light efficiency makes the overall brightness of the LCD screen low. Although OLED is autonomous and has higher light efficiency than LCD, it is an inorganic light source and the number of electrons injected cannot be large, otherwise it is very easy to burn out the light source itself, so the brightness of the entire screen is still limited.

[0005] The reason why screens larger than 100 inches can't be made is that both use the same backplane drive technology, and large backplane technology is currently difficult to achieve at 100 inches. Moreover, for screens larger than 100 inches, if multiple small screens are spliced ​​together, the LCD screen frame will not be seamless.

[0006] To meet market demand for larger screen sizes, non-direct display projection products have emerged, utilizing optical systems to amplify the light source. Currently, projection technologies include LCD and DLP. LCD projection is further categorized as 3LCD and LCOS. DLP utilizes a micro-array reflector chip (DMD) to pixelate a white light source (each lens in the array mirror deflects differently, representing a different pixel). This is then filtered through an RGB color wheel to create a color image, which is then amplified and projected onto a screen through an optical system.

[0007] Projection systems that use LCD as a light source, whether a single LCD, LCOS light source, or a 3LCD system, still do not utilize a high-efficiency backlight. Moreover, compared to LCD-type direct display screens, the projection also magnifies the image through an optical system, which makes the brightness of such projection products relatively lower and can only be used in low-brightness indoor environments.

[0008] DLP projection technology utilizes a white backlight source, forming an image through the deflection of a DMD multi-array micro-mirror, then forming a color image through an RGB color wheel, and finally amplifying the image through an optical system. Although the filtering effect of the color wheel in DLP projection reduces light efficiency, it can use high-brightness LEDs, lasers, and other devices as backlight sources to avoid excessive light attenuation by the liquid crystal system structure. Its brightness is superior to that of LCD light source projection systems to a certain extent, making it a current advanced display technology. It should also be noted that DMD is merely a reflective device without any light-emitting function, so there are no DMD-based small and medium-sized display products such as smart wearables, computer screens, and televisions. Direct display LED_SMD screens and LED_COB screens are widely used in strong light environments indoors and outdoors. The reason is that LED is an inorganic light-emitting body with the characteristics of high current and high brightness. However, this type of screen is currently a large spliced ​​screen and cannot achieve high-density pixels. It is limited by the spacing of LED lamp beads or LED chips. The smaller the spacing, the more complex the preparation process, the larger the transfer amount and the lower the yield. At present, the pixel pitch of LED direct display screens is difficult to achieve 0.4mm, that is, the pixel density (PPI) is difficult to achieve 70, and it is difficult to apply to small-sized high-definition display products. Technical issues

[0009] In order to obtain a color high-definition spliced ​​LED screen with higher pixel density, high light efficiency and no splicing seams, while taking into account the preparation process and cost, the present invention provides an LED direct display projection array light-emitting module and display screen. Solution

[0010] The first object of the present invention is to provide an LED direct display projection array light emitting module, the light emitting module comprising: a driving unit, a display unit and an imaging unit; the display unit is driven by a signal from the driving unit to display an image on the imaging unit;

[0011] The driving unit is used to generate a driving signal according to the image or video to be displayed, and transmit the driving signal to the display unit; each display unit includes three display sources and corresponding three optical amplification components, the three display sources are three monochrome integrated LED array chips, corresponding to the three colors of R, G, and B respectively, each optical amplification component includes a magnifying objective lens, the integrated LED array chip corresponds to the magnifying objective lens one-to-one, and the images formed by the light emitted by the three display sources can overlap after being magnified by the three magnifying objective lenses respectively. Under the action of the driving signal, the display unit drives the display source to emit light and amplifies the image formed by the light emitted by the display source through the optical amplification component. The integrated LED array chip and the magnifying objective lens work together to enable the PPI of the amplified image to reach any value between 20 and 1000; the imaging unit includes an imaging screen, the imaging unit is used to receive the image amplified by the display unit and image it on the imaging screen, and the thickness of the light-emitting module ranges from 5 to 100 mm.

[0012] Optionally, the driving unit is implemented by a multi-layer PCB circuit board, and the multi-layer PCB circuit board is provided with a corresponding video source decoding IC circuit and a driving circuit;

[0013] The three integrated LED array chips of the display unit are integrated into the multi-layer PCB circuit board and connected to the driving circuit;

[0014] The three integrated LED array chips of the display unit corresponding to the optical amplification component are fixed on the multi-layer PCB circuit board.

[0015] Optionally, the driving unit includes a video decoding driving board and a display unit driving board, the video decoding driving board is used to decode the video source to obtain a video decoding signal, and send the video decoding signal to the display unit driving board; the display unit driving board is used to convert the decoding signal into an electrical signal for driving a single display unit.

[0016] Optionally, the imaging unit further comprises a light-transmitting plate, the light-transmitting plate being arranged between the display unit and the imaging screen, the light-transmitting plate being provided with a light-emitting area corresponding to each display unit, so that light after passing through the magnifying objective lens is emitted from the light-emitting area and projected onto the imaging screen, and the number of the light-emitting areas is the same as the number of the display units;

[0017] Optionally, the light-transmitting plate is black.

[0018] Optionally, a focusing lens array is also provided in front of the light-transmitting plate, and the side of the light-transmitting plate facing the focusing lens array is set to a suitable shape according to the focusing lens to achieve the function of fixing the focusing lens. The light after passing through the magnifying objective lens is then shaped and collected by the focusing lens and then emitted from the light-emitting area and projected onto the imaging screen.

[0019] Optionally, the imaging screen surface is subjected to diffuse reflection processing.

[0020] Optionally, the focus area on the imaging screen surface is gray or black, and the area outside the focus area is black; the focus area is the area on the imaging screen corresponding to each light exit area.

[0021] Optionally, the video decoding driver board is provided with a video source decoding IC circuit and multiple connector ports; after the video source decoding IC circuit decodes the video source to obtain a video decoding signal, it is sent to the corresponding display unit driver board through each connector port; the video decoding driver board is electrically connected to the display unit driver board through a connector or an FPC extension cable.

[0022] Optionally, the video decoding driving board and the display unit driving board are circuit boards made of ultra-flat glass, glass fiber or BT resin substrate and have multi-layer circuits and driving ICs.

[0023] Optionally, the display unit further includes a display unit substrate, the integrated LED array chip is fixed on the display unit substrate via an insulating material, and the optical amplification component is fixed on the display unit substrate corresponding to each integrated LED array chip;

[0024] The front side of the display unit driving board is electrically connected to the display unit substrate in the display unit through a conductive material, and the back side is provided with a plug interface, which is electrically connected to the video decoding driving board through the plug interface.

[0025] A second object of the present invention is to provide an LED direct display projection array light emitting module different from the above structure, the light emitting module comprising: a driving unit, a display unit and an imaging unit; the display unit is driven by a signal from the driving unit to display an image on the imaging unit;

[0026] The driving unit is used to generate a driving signal according to the image or video to be displayed, and transmit the driving signal to the display unit; each display unit includes three display sources and an optical magnification component, the three display sources are three monochrome integrated LED array chips, corresponding to the three colors of R, G, and B respectively, the optical magnification component includes a three-in-one magnifying objective lens and a corresponding objective lens fixing base, and each three monochrome integrated LED array chips corresponds to a three-in-one magnifying objective lens. Under the action of the driving signal, the display unit drives the display source to emit light and amplifies and images the display content of the integrated LED array chip through the optical magnification component, and the images formed by the light emitted by the three display sources can overlap after being magnified by the magnifying objective lens. The integrated LED array chip and the magnifying objective lens work together to enable the PPI of the amplified image to reach any value between 20 and 1000; the imaging unit includes an imaging screen, which is used to receive the image amplified by the display unit and image it on the imaging screen. The thickness of the light-emitting module ranges from 5 to 100 mm.

[0027] Optionally, the driving unit is implemented by a multi-layer PCB circuit board, and the multi-layer PCB circuit board is provided with a corresponding video source decoding IC circuit and a driving circuit;

[0028] The three integrated LED array chips of the display unit are integrated into the multi-layer PCB circuit board and connected to the driving circuit;

[0029] The three integrated LED array chips of the display unit corresponding to the optical amplification component are fixed on the multi-layer PCB circuit board.

[0030] Optionally, the driving unit includes a video decoding driving board and a display unit driving board, the video decoding driving board is used to decode the video source to obtain a video decoding signal, and send the video decoding signal to the display unit driving board; the display unit driving board is used to convert the decoding signal into an electrical signal for driving a single display unit.

[0031] Optionally, the imaging unit further comprises a light-transmitting plate, which is disposed between the display unit and the imaging screen. A light-emitting area is provided on the light-transmitting plate corresponding to each display unit, so that light passing through the three-in-one magnifying objective lens is emitted from the light-emitting area and projected onto the imaging screen. The number of the light-emitting areas is the same as the number of the display units.

[0032] Optionally, the light-transmitting plate is black.

[0033] Optionally, a focusing lens array is further provided in front of the light-transmitting plate, and the side of the light-transmitting plate facing the focusing lens array is set to a suitable shape according to the focusing lens to achieve the function of fixing the focusing lens. The light after passing through the three-in-one magnifying objective lens is then shaped and collected by the focusing lens and then emitted from the light-emitting area and projected onto the imaging screen.

[0034] Optionally, the imaging screen surface is subjected to diffuse reflection processing;

[0035] Optionally, the focus area on the imaging screen surface is gray or black, and the area outside the focus area is black; the focus area is the area on the imaging screen corresponding to each light exit area.

[0036] Optionally, the video decoding driver board is provided with a video source decoding IC circuit and multiple connector ports; after the video source decoding IC circuit decodes the video source to obtain a video decoding signal, it is sent to the corresponding display unit driver board through each connector port; the video decoding driver board is electrically connected to the display unit driver board through a connector or an FPC extension cable.

[0037] Optionally, the video decoding driving board and the display unit driving board are circuit boards made of ultra-flat glass, glass fiber or BT resin substrate and have multi-layer circuits and driving ICs.

[0038] Optionally, the display unit further includes a display unit substrate, the integrated LED array chip is fixed on the display unit substrate via an insulating material, and the optical amplification component is fixed on the display unit substrate corresponding to each integrated LED array chip;

[0039] The front side of the display unit driving board is electrically connected to the display unit substrate in the display unit through a conductive material, and the back side is provided with a plug interface, which is electrically connected to the video decoding driving board through the plug interface.

[0040] The third object of the present invention is to provide a display screen, which is obtained by splicing a plurality of the above-mentioned light-emitting modules.

[0041] Optionally, the display screen can be formed into a flexible screen and a special-shaped screen by adjusting the splicing angles between the light-emitting modules.

[0042] The beneficial effects of the present invention are:

[0043] The present invention utilizes semiconductor technology to integrate and miniaturize active light sources to obtain LED integrated chips as light sources. The light sources are directly controlled by circuits, and then magnified by a magnifying lens at a certain magnification according to the application scenario requirements. The image is then formed on an imaging screen through a light-transmitting plate. By arranging integrated LED array chips corresponding to the three colors of R, G, and B, the light-emitting module can display color patterns. Furthermore, the present application sets a focusing lens array in front of the light-transmitting plate and uses the focusing lens to focus the image on each pixel; through the combination of the magnifying lens and the focusing lens, products of various sizes can be designed under the condition of sufficient light source intensity. At the same time, because the display source in the light-emitting module provided by the present application adopts an integrated chip, the pixels of the display screen are no longer limited by the LED spacing. If the size of the integrated chip is 1×1mm, the size range of the internal light-emitting chip is 5μm~100μm. The pixel pitch of the final spliced ​​display screen of the present application can easily reach 0.1mm, and the corresponding PPI can reach 250. By selecting the appropriate magnification, the PPI range can be 20-1000, while the pixel density (PPI) of the current LED direct display screen is difficult to achieve 70.

[0044] Moreover, the size of each light-emitting module is much smaller than the existing SMD and COB splicing blocks. Therefore, when splicing into a large screen, the splicing angle can be adjusted arbitrarily to realize various products with no splicing border size, even special-shaped or flexible screens.

[0045] In addition, the present application integrates the chip size design with the optical magnification so that the brightness can meet various application scenarios. That is, for screens with high brightness requirements, an objective lens with a smaller magnification is used; for screens with low brightness requirements, an objective lens with a larger magnification is used. By selecting the magnification, a screen that can meet the brightness requirements in various application scenarios is obtained.

[0046] Furthermore, the cost of integrated chips is lower than that of current discrete LED chips, and can better utilize the cost advantage of LED's high current density. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0048] FIG1 is an overall schematic diagram of a light-emitting module provided by one embodiment of the present invention;

[0049] FIG2 is an exploded view of a light emitting module when a multi-layer PCB circuit board is used to implement a driving unit according to an embodiment of the present invention.

[0050] FIG3 is an overall schematic diagram of a driving unit implemented by a combination of a video decoding driving board and a display unit driving board according to an embodiment of the present invention.

[0051] FIG4 is a cross-sectional view of a display unit in a light-emitting module provided in one embodiment of the present invention.

[0052] FIG5 is a schematic diagram of a light-emitting module structure when an imaging unit provided by an embodiment of the present invention includes an imaging screen and a light-transmitting plate.

[0053] FIG6 is a perspective view of a light-transmitting plate in an imaging unit in a light-emitting module provided in one embodiment of the present invention.

[0054] FIG7 is an exploded view of a light emitting module when an imaging unit provided by one embodiment of the present invention includes an imaging screen, a light-transmitting plate, and a focusing lens array.

[0055] FIG8 is an overall cross-sectional view of a light-emitting module provided in one embodiment of the present invention.

[0056] FIG9 is an overall schematic diagram of a light emitting module of another structure provided by an embodiment of the present invention.

[0057] FIG10 is an exploded view of a light emitting module of another structure provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0058] Currently, fine-pitch LED screens come in two types: SMD (Surface Mounted Devices) and COB (Chip On Board). SMD screens package three RGB LED chips within a single bead, which is then surface-mounted on a printed circuit board (PCB). COB screens, on the other hand, package the three RGB LED chips directly onto the PCB. Therefore, SMD screens can currently achieve a pixel pitch of 1.25, corresponding to a PPI (Pixels Per Inch) density of 25.4 / 1.25 = 20.32. COB screens can achieve a pixel pitch of 0.6, corresponding to a PPI of 42.33. The PPI of an LCD screen is inversely proportional to its size: the larger the screen, the lower the PPI. Typically, a 55-inch LCD screen with a 4K resolution can achieve a PPI of 84, while an 8K resolution can reach a PPI of 160. This shows that while fine-pitch LEDs offer a sufficiently small pitch, they still cannot reach the high-definition resolution of LCD screens.

[0059] The present application solution uses an LED integrated chip, which is then magnified by a magnifying lens and focused by a focusing lens, and finally formed on an imaging screen. By adjusting the magnification of the magnifying lens and the size of the LED array on the LED integrated chip, the minimum PPI can reach 847, as explained below:

[0060] Assuming that the magnification of the magnifying lens is 1 and the spacing between each LED chip in the LED array on the LED integrated chip is 30μm, then PPI=25.4×1000mm / 30=847.

[0061] By selecting magnifying lenses with other magnifications and integrated chips with other LED array sizes, the present application solution can produce a screen with a higher PPI value.

[0062] The selection of a magnifying objective lens with a specific magnification can be determined based on the brightness requirements of the final screen.

[0063] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention is described in further detail below with reference to the accompanying drawings.

[0064] Example 1

[0065] This embodiment provides an LED direct display projection array light-emitting module. Referring to FIG1 , the light-emitting module includes:

[0066] A drive unit 1, a display unit 2, and an imaging unit 3; the display unit 2 is driven by a signal from the drive unit 1 to display an image on the imaging unit 3; each display unit 2 includes three display sources and three optical amplification components, the three display sources being three monochrome integrated LED array chips corresponding to the three colors R, G, and B, respectively; each optical amplification component includes a magnifying objective lens and a corresponding objective lens fixing base, and by adjusting the mounting angles of the three optical amplification components, the images formed by the light emitted by the three display sources can be superimposed on the imaging screen after being magnified by the three magnifying objective lenses, and the integrated LED array chip and the magnifying objective lens work together to enable the PPI of the amplified image to reach any value between 20 and 1000.

[0067] In practical applications, the drive unit 1 can be implemented in two ways: in one implementation, the drive unit 1 can be implemented using a multi-layer PCB circuit board; in another implementation, the drive unit 1 can be implemented using a video decoding driver board and a display unit driver board. The following describes these two implementations using the second and third embodiments respectively:

[0068] Example 2

[0069] This embodiment provides an LED direct display projection array light-emitting module, see Figure 2, the light-emitting module includes a driving unit 1, a display unit 2 and an imaging unit 3; the display unit 2 displays an image on the imaging unit 3 under the signal drive of the driving unit 1.

[0070] The driving unit 1 is implemented by a multi-layer PCB circuit board, on which corresponding video source decoding IC circuits and driving circuits are arranged.

[0071] The display unit 2 includes three display sources 23 and three corresponding optical magnification components. The three display sources 23 are three monochrome integrated LED array chips, corresponding to the three colors R, G, and B respectively. Each optical magnification component includes a magnifying objective lens 22 and a corresponding objective lens fixing base 21. The integrated LED array chips correspond one-to-one to the magnifying objective lenses, that is, each integrated LED array chip uses a magnifying objective lens to magnify and image its display content.

[0072] The integrated LED array chip serving as the display source 23 is integrated onto a multi-layer PCB circuit board and is connected to a drive circuit. It emits light when driven by an electrical signal from the drive circuit, and each luminous point in the integrated LED array chip can emit light independently when driven by the electrical signal. Specifically, after the display source 23 is soldered onto the multi-layer PCB circuit board via welding wires or through-hole welding, an objective lens fixing base 21 is fixed onto the multi-layer PCB circuit board via an adhesive material such as glue. The objective lens fixing base 21 is adapted to the shape of the magnifying lens. The objective lens fixing base 21 clamps the magnifying lens 22 onto the display source 23. A light emitting area is provided above the objective lens fixing base 21. The light emitted by the display source 23 passes through the magnifying lens and then exits from the light emitting area. The outer shell of the objective lens fixing base 21 is black, which not only protects the objective lens but also prevents stray light from interfering with imaging.

[0073] It should be noted that the correspondence between the objective lens fixing base 21 and the magnifying objective lens 22 can be one-to-one, that is, one magnifying objective lens 22 corresponds to one objective lens fixing base 21; or every three magnifying objective lenses 22 (that is, the magnifying objective lenses corresponding to the three-color integrated LED array chips of R, G, and B) correspond to one objective lens fixing base 21. In actual applications, all objective lens fixing bases 21 can be prepared in one piece according to the requirements of the preparation process, and the correspondence between the objective lens fixing base 21 and the magnifying objective lens 22 can also be determined according to the size of the final spliced ​​screen.

[0074] Example 3

[0075] This embodiment provides an LED direct display projection array light-emitting module, see Figure 3, the light-emitting module includes a driving unit 1, a display unit 2 and an imaging unit 3; the display unit 2 displays an image on the imaging unit 3 under the signal drive of the driving unit 1.

[0076] The driving unit 1 is implemented using a video decoding driving board 11 and a display unit driving board 12. The video decoding driving board 11 is used to decode the video source to obtain a video decoding signal, and send the video decoding signal to the display unit driving board 12; the display unit driving board 12 is used to convert the decoding signal into an electrical signal for driving a single display unit, that is, a driving signal. Each light-emitting point in the integrated LED array chip can emit light independently under the drive of the electrical signal.

[0077] The video decoding driving board 11 and the display unit driving board 12 can be circuit boards made of ultra-flat glass, glass fiber or BT resin substrate and have multi-layer circuits and driving ICs.

[0078] As shown in FIG3 , the display unit 2 includes, in addition to a display source 23 and an optical amplification assembly (the optical amplification assembly includes three magnifying objective lenses 22 and corresponding objective lens fixing bases 21 ), a display unit substrate 24 . Three integrated LED array chips serving as the display source 23 are soldered to the display unit substrate 24 via bonding wires (in FIG3 , the display source 23 and the optical amplification assembly are not exploded for display). The front side of the display unit driver board 12 is electrically connected to the display unit substrate 24 via a conductive material, and a plug interface is provided on the back side, which is electrically connected to the corresponding plug interface 111 on the video decoding driver board 11 via the plug interface.

[0079] Typically, the conductive material may be solder paste, silver glue, or the like.

[0080] The objective lens mounting base 21 is also secured to the display unit substrate 24 using an adhesive such as glue. As shown in Figure 4 , the objective lens mounting base 21 is configured to accommodate the shape of the magnifying objective lens 22. It secures the magnifying objective lens 22 to the display source 23. A light-emitting area is positioned above the objective lens mounting base 21. Light from the three integrated LED array chips serving as the display source 23 passes through the magnifying objective lens and exits from the light-emitting area. The black outer shell of the objective lens mounting base 21 protects the objective lens and prevents stray light from interfering with the image.

[0081] It should be noted that, in actual applications, the integrated LED array chips corresponding to the three colors of R, G, and B are arranged in a triangle position, so the display unit cross-sectional view given in Figure 4 only includes two integrated LED array chips and corresponding amplification modules.

[0082] Example 4

[0083] This embodiment provides an LED direct display projection array light-emitting module. This embodiment further improves the implementation scheme of the imaging unit 3 based on the light-emitting module provided in the third embodiment.

[0084] Based on the current more mature manufacturing process of monochrome integrated LED array chips and the need to realize color splicing screens, this embodiment provides an LED direct display projection array light-emitting module. As shown in FIG5 , the light-emitting module includes: a driving unit 1, a display unit 2, and an imaging unit 3. The display unit 2 is driven by the signal of the driving unit 1 to display an image on the imaging unit 3.

[0085] The driving unit 1 is used to generate a driving signal based on the image or video to be displayed and transmit the driving signal to the display unit; each display unit 2 includes three display sources 23 and corresponding three optical magnification components. The three display sources 23 are three monochrome integrated LED array chips, corresponding to the three colors R, G, and B respectively. Each optical magnification component includes a magnifying objective lens 22 and a corresponding objective lens fixing base 21. The integrated LED array chips and the magnifying objective lenses have a one-to-one correspondence, that is, each integrated LED array chip uses a magnifying objective lens to magnify and image its display content.

[0086] Under the action of the driving signal, the display unit 2 drives the three display sources 23 to emit light correspondingly and amplifies and images the display content of the integrated LED array chip through the optical amplification component; by adjusting the installation angles of the three optical amplification components, the images formed by the light emitted by the three display sources can be superimposed on the imaging screen 31 after being magnified by the three magnifying objective lenses.

[0087] It should be noted that in order to ensure that the magnifying objective lens 22 can magnify the display content of the integrated LED array chip and image it on the imaging screen 31 , the integrated LED array chip needs to be set within the range of 1-2 times the focal length of the magnifying objective lens 22 .

[0088] As shown in Figure 5, driver unit 1 is implemented using a video decoder driver board 11 and a display unit driver board 12. Video decoder driver board 11 decodes the video source to generate a decoded video signal and transmits it to display unit driver board 12. Display unit driver board 12 converts the decoded signal into an electrical signal, or drive signal, that drives a single display unit. Video decoder driver board 11 and display unit driver board 12 can be circuit boards made of ultra-flat glass, fiberglass, or BT resin substrates, with multilayer circuitry and driver ICs.

[0089] As shown in FIG5 , the display unit 2 includes, in addition to a display source 23 and an optical amplification assembly (the optical amplification assembly includes three magnifying objective lenses 22 and corresponding objective lens fixing bases 21 ), a display unit substrate 24 . Three integrated LED array chips serving as the display source 23 are soldered to the display unit substrate 24 via bonding wires (in FIG5 , the display source 23 and the optical amplification assembly are not exploded for display). The front side of the display unit driver board 12 is electrically connected to the display unit substrate 24 via a conductive material, and a plug interface is provided on the back side, which is electrically connected to the corresponding plug interface 111 on the video decoding driver board 11 via the plug interface.

[0090] The objective lens mounting base 21 is also secured to the display unit substrate 24 using adhesive materials such as glue. The objective lens mounting base 21 is designed to accommodate the shape of the magnifying objective lens 22 and securely fasten the magnifying objective lens 22 to the display source 23. A light-emitting area is positioned above the objective lens mounting base 21. Light from the three integrated LED array chips serving as the display source 23 passes through the magnifying objective lens and exits from the light-emitting area. The black outer shell of the objective lens mounting base 21 protects the objective lens and prevents stray light from interfering with the image.

[0091] The surface of the imaging screen 31 is treated with diffuse reflection, and the color of the imaging screen 31 is determined based on the desired contrast. Typically, to achieve high contrast in the final image, the light-emitting area of ​​the imaging screen 31 corresponding to the objective lens mounting base 21 can be gray or black, while the remaining areas can be black, thereby improving display contrast. If the contrast requirement for the final image is less stringent, the color of the imaging screen 31 can also be set to other colors. In practical applications, the imaging screen 31 can be made of transparent or translucent materials such as glass, plastic, and resin.

[0092] If the imaging screen 31 is made of a non-supporting material such as plastic, then in order to improve the supporting force of the screen, a light-transmitting plate can be additionally provided to improve the supporting force of the screen. As shown in FIG5 , in one embodiment, the imaging unit 3 further includes a light-transmitting plate 32, which is arranged between the display unit 2 and the imaging screen 31. As shown in FIG6 , a light-emitting area 321 of a certain size is provided on the light-transmitting plate 32 corresponding to each display unit 2, so that the light after passing through the magnifying objective lens is emitted from the light-emitting area and projected onto the imaging screen. The number of light-emitting areas is the same as the number of display units. The light-transmitting plate 32 can be made of transparent or non-transparent material. If the light-transmitting plate 32 is made of non-transparent material, the light-emitting area 321 can be realized by opening a hole. At the same time, considering the high contrast of the final imaging, the non-opening area can be painted black. If the light-transmitting plate 32 is made of transparent material, the light-emitting area 321 can be realized by coloring or other methods, that is, the area outside the light-emitting area 321 is painted black or blocked.

[0093] In order to further improve the utilization rate of light, as shown in Figure 7, in one embodiment, the imaging unit 3 also includes a focusing lens array 33, and the side of the light-transmitting plate 32 facing the focusing lens array 33 is set to a suitable shape according to the focusing lens to achieve the effect of fixing the focusing lens. The light after passing through the magnifying objective lens 22 is then shaped and collected by the focusing lens, and then emitted from the light exit area and projected onto the imaging screen 31.

[0094] In actual applications, the focus area on the surface of the imaging screen 31 is gray or black, and the area outside the focus area is black; the focus area is the area on the imaging screen corresponding to each light emitting area.

[0095] In practical applications, the correspondence between the display unit driver board 12 and the display unit 2 can be one-to-many or one-to-one. The correspondence between the display unit 2 and the imaging unit 3 can be one-to-one or many-to-one. Typically, an imaging unit 3 can correspond to multiple display units 2 to form a splicing unit. The number of focusing lenses in the focusing lens array 33 of the imaging unit 3 is the same as the number of pixels of the display source 23 in all the corresponding display units 2. That is, the light signal of each pixel emerges from a single light-transmitting hole and is imaged on the screen.

[0096] Figure 8 illustrates how the image formed by the light emitted by three integrated LED array chips, corresponding to the three colors R, G, and B, in a single display unit is magnified several times by an optical amplification assembly, then shaped and collected by a focusing lens array to form a pixel light spot. The surface of the imaging screen 31 is treated to facilitate diffuse light emission, thereby improving the viewing angle.

[0097] Based on the light-emitting module provided in this embodiment, a spliced ​​screen of any size can be realized. The thickness d of the light-emitting module of this application is determined by the focal length of the magnifying lens, and the overall thickness is generally in the range of 5-100 mm. When manufacturing a display screen, the thickness d of the light-emitting module is negligible relative to the thickness of the screen's supporting structure, and is generally between a few millimeters and tens of millimeters. Therefore, even if the light-emitting module of this application has a certain thickness due to the use of a magnifying lens, it will not increase the thickness of the final screen.

[0098] When a large screen is realized, it is obtained by splicing multiple light-emitting modules. If a special-shaped screen is to be prepared, considering that if a single splicing unit is too large, its splicing angle is limited, an imaging unit 3 of a suitable size can be designed, or even the display unit 2 and the imaging unit 3 can be one-to-one.

[0099] Example 5

[0100] This embodiment provides an LED direct display projection array light module. Unlike the light modules provided in Examples 1 to 4 above, each display unit in this embodiment includes three display sources and an optical magnification assembly. The three display sources are three monochrome integrated LED array chips, corresponding to the three colors R, G, and B, respectively. The optical magnification assembly includes a three-in-one magnifying objective lens and a corresponding objective lens mounting base. Specifically, the three magnifying objective lenses corresponding to the three display sources in the above embodiments are implemented using a three-in-one magnifying objective lens, as shown in Figure 9.

[0101] Similarly, the drive unit 1 can be implemented in two ways: in one implementation, the drive unit 1 can be implemented using a multi-layer PCB circuit board; in the other implementation, the drive unit 1 can be implemented using a video decoder driver board and a display unit driver board. The following takes the implementation of the drive unit 1 using the video decoder driver board 11 and the display unit driver board 12 as an example for description:

[0102] As shown in Figure 10, the driving unit 1 is used to generate a driving signal according to the image or video to be displayed, and transmit the driving signal to the display unit; each display unit 2 includes three display sources 23 and an optical amplification component, the three display sources 23 are three monochrome integrated LED array chips, corresponding to the three colors of R, G, and B respectively, the optical amplification component includes a three-in-one magnifying objective lens 22 and a corresponding objective lens fixing base 21, the image formed by the light emitted by the three display sources 23 can be overlapped after being magnified by the three-in-one magnifying objective lens, and the display unit 2 drives the display source 23 to emit light under the action of the driving signal and amplifies and images the display content of the integrated LED array chip through the optical amplification component; the imaging unit 3 includes an imaging screen 31, and the imaging unit 3 is used to receive the image magnified by the display unit 2 and image it on the imaging screen 31.

[0103] Similarly, in order to ensure that the three-in-one magnifying objective lens 22 can magnify the display content of the integrated LED array chip and image it on the imaging screen 31, the integrated LED array chip needs to be set within the range of 1-2 times the focal length of the three-in-one magnifying objective lens 22.

[0104] As shown in Figure 10, driver unit 1 is implemented using a video decoder driver board 11 and a display unit driver board 12. Video decoder driver board 11 decodes the video source to generate a decoded video signal and transmits it to display unit driver board 12. Display unit driver board 12 converts the decoded signal into an electrical signal, or drive signal, that drives a single display unit. Video decoder driver board 11 and display unit driver board 12 can be circuit boards made of ultra-flat glass, fiberglass, or BT resin substrates, with multilayer circuitry and driver ICs.

[0105] As shown in FIG10 , the display unit 2 includes, in addition to a display source 23 and an optical magnification assembly (the optical magnification assembly includes a three-in-one magnifying objective lens 22 and an objective lens fixing base 21 ), a display unit substrate 24 . The integrated LED array chip serving as the display source 23 is soldered to the display unit substrate 24 via bonding wires. The front side of the display unit driver board 12 is electrically connected to the display unit substrate 24 via conductive material, and a plug interface is provided on the back side, which is electrically connected to the corresponding plug interface 111 on the video decoding driver board 11 via the plug interface.

[0106] The objective lens mounting base 21 is also secured to the display unit substrate 24 using adhesive materials such as glue. The objective lens mounting base 21 is designed to accommodate the shape of the three-in-one magnifying objective lens 22. It secures the three-in-one magnifying objective lens 22 to the display source 23. A light exit area is provided above the objective lens mounting base 21. Light from the display source 23 passes through the three-in-one magnifying objective lens and is emitted from the light exit area. The black outer shell of the objective lens mounting base 21 protects the objective lens and prevents stray light from interfering with the image.

[0107] Since the lens size in this application is at the millimeter level, it is difficult to prepare the three-in-one objective lens currently available on the market. Therefore, Figures 9 and 10 of this application use a three-in-one magnifying objective lens that uses three objective lenses embedded in an objective lens fixing base as an example for explanation. The objective lens fixing base limits the angles of the three objective lenses accordingly, so that the images formed by the light emitted by the three display sources overlap on the imaging screen 31.

[0108] The surface of the imaging screen 31 is treated with diffuse reflection, and the color of the imaging screen 31 is determined based on the desired contrast. Typically, to achieve high contrast in the final image, the light-emitting area of ​​the imaging screen 31 corresponding to the objective lens mounting base 21 can be gray or black, while the remaining areas can be black, thereby improving display contrast. If the contrast requirement for the final image is less stringent, the color of the imaging screen 31 can also be set to other colors. In practical applications, the imaging screen 31 can be made of transparent or translucent materials such as glass, plastic, and resin.

[0109] If the imaging screen 31 is made of a non-supporting material such as plastic, then in order to improve the support of the screen, a light-transmitting plate can be additionally provided to improve the support of the screen. As shown in Figure 5, in one embodiment, the imaging unit 3 also includes a light-transmitting plate 32, which is arranged between the display unit 2 and the imaging screen 31. Referring to Figure 6 corresponding to Example 1, a light-emitting area 321 of a certain size is provided on the light-transmitting plate 32 corresponding to each display unit 2, so that the light after passing through the magnifying objective lens is emitted from the light-emitting area and projected onto the imaging screen. The number of light-emitting areas is the same as the number of display units; the light-transmitting plate 32 can be made of transparent or non-transparent material; if the light-transmitting plate 32 is made of non-transparent material, the light-emitting area 321 can be realized by opening a hole, and considering the high contrast of the final image, the non-opening area can be painted black; if the light-transmitting plate 32 is made of transparent material, the light-emitting area 321 can be realized by coloring or other methods, that is, the area outside the light-emitting area 321 is painted black or blocked.

[0110] In order to further improve the utilization rate of light, referring to Figure 7 corresponding to Example 4, in one embodiment, the imaging unit 3 also includes a focusing lens array 33, and the side of the light-transmitting plate 32 facing the focusing lens array 33 is set to a suitable shape according to the focusing lens to achieve the effect of fixing the focusing lens. The light after passing through the magnifying objective lens 22 is then shaped and collected by the focusing lens, and then emitted from the light exit area and projected onto the imaging screen 31.

[0111] In actual applications, the focus area on the surface of the imaging screen 31 is gray or black, and the area outside the focus area is black; the focus area is the area on the imaging screen corresponding to each light emitting area.

[0112] In practical applications, the correspondence between the display unit driver board 12 and the display units 2 can be one-to-many or one-to-one. The correspondence between the display units 2 and the imaging units 3 can also be one-to-one or many-to-one. Typically, an imaging unit 3 can correspond to multiple display units 2 to form a splicing unit. The number of focusing lenses in the focusing lens array 33 of the imaging unit 3 is the same as the number of pixels in the display source 23 of all the corresponding display units 2. That is, the light signal of each pixel emerges from a single light-transmitting hole and forms an image on the screen.

[0113] Figure 8 illustrates how the image formed by the light emitted by three integrated LED array chips, corresponding to the three colors R, G, and B, in a single display unit is magnified several times by an optical amplification assembly, then shaped and collected by a focusing lens array to form a pixel light spot. The surface of the imaging screen 31 is treated to facilitate diffuse light emission, thereby improving the viewing angle.

[0114] Based on the light-emitting module provided in this embodiment, a spliced ​​screen of any size can be realized. The thickness d of the light-emitting module of this application is determined by the focal length of the magnifying objective lens. When manufacturing a display screen, the thickness d of the light-emitting module is negligible relative to the thickness of the screen's supporting structure, typically ranging from a few millimeters to tens of millimeters. Therefore, even if the light-emitting module of this application has a certain thickness due to the use of the magnifying objective lens, it will not increase the thickness of the final screen.

[0115] When a large screen is realized, it is obtained by splicing multiple light-emitting modules. If a special-shaped screen is to be prepared, considering that if a single splicing unit is too large, its splicing angle is limited, an imaging unit 3 of a suitable size can be designed, or even the display unit 2 and the imaging unit 3 can be one-to-one.

[0116] Example 6

[0117] This embodiment provides a display screen, which is obtained by splicing multiple LED direct display projection array light modules provided in the above embodiments. By adjusting the splicing angles between the light modules, a flexible screen and a special-shaped screen can be obtained.

[0118] Because the display source in the light-emitting module uses an integrated LED array chip, the number of integrated LED array chips required to achieve the same pixel resolution is far less than that of a single LED chip, thereby reducing screen assembly time and production costs. By selecting the magnification of the magnifying lens, a screen suitable for different brightness requirements can be obtained.

[0119] For example, assuming that the display source 23 uses a 20×20 monochrome LED array chip, if you want to obtain a pixel resolution of 2000*1000, you need to use a combination of 100*50 array light sources. In the existing technology, a monochrome 2000*1000 resolution LED_COB screen needs to transfer 2k*1k LED chips to the PCB, while the present invention only needs to transfer 100*50 array chips, and the transfer amount is 400 times different. Therefore, in terms of preparation process, the present application solution is easier to implement.

[0120] In addition, the size of each light-emitting module of the present application is much smaller than the existing SMD and COB splicing blocks. Therefore, when splicing into a large screen, the splicing angle can be adjusted arbitrarily to realize a flexible screen and an irregular screen.

[0121] Some steps in the embodiments of the present invention may be implemented using software, and the corresponding software program may be stored in a readable storage medium, such as a CD or a hard disk.

[0122] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An LED direct display projection array light emitting module, characterized in that: The light-emitting module comprises: a driving unit, a display unit and an imaging unit; the display unit displays an image on the imaging unit under the drive of a signal from the driving unit; the driving unit is used to generate a driving signal according to an image or video to be displayed, and transmit the driving signal to the display unit; each display unit comprises three display sources and corresponding three optical amplification components, the three display sources are three monochrome integrated LED array chips corresponding to the three colors of R, G and B respectively, each optical amplification component comprises a magnifying objective lens and a corresponding objective lens fixing base, the integrated LED array chip corresponds to the magnifying objective lens one by one, and by adjusting the installation angles of the three optical amplification components, the images formed by the light emitted by the three display sources can overlap after being magnified by the three magnifying objective lenses respectively, the display unit drives the display source to emit light under the action of the driving signal and amplifies the image formed by the light emitted by the display source through the optical amplification component; the imaging unit comprises an imaging screen, the imaging unit is used to receive the image magnified by the display unit and image it on the imaging screen, and the thickness range of the light-emitting module is 5-100 mm.

2. The light emitting module according to claim 1, characterized in that: The driving unit is implemented by a multi-layer PCB circuit board, on which a corresponding video source decoding IC circuit and a driving circuit are arranged; the three integrated LED array chips of the display unit are integrated on the multi-layer PCB circuit board and connected to the driving circuit; the three integrated LED array chips of the display unit corresponding to the optical amplification component are fixed on the multi-layer PCB circuit board.

3. The light emitting module according to claim 1, characterized in that: The driving unit includes a video decoding driving board and a display unit driving board. The video decoding driving board is used to decode the video source to obtain a video decoding signal, and send the video decoding signal to the display unit driving board; the display unit driving board is used to convert the decoding signal into an electrical signal for driving a single display unit.

4. The light emitting module according to claim 1, characterized in that: The imaging unit also includes a light-transmitting plate, which is arranged between the display unit and the imaging screen. A light-emitting area is arranged on the light-transmitting plate corresponding to each display unit, so that light passing through the magnifying objective lens is emitted from the light-emitting area and projected onto the imaging screen. The number of the light-emitting areas is the same as the number of the display units.

5. The light emitting module according to claim 4, characterized in that: A focusing lens array is also arranged in front of the light-transmitting plate. The side of the light-transmitting plate facing the focusing lens array is set to a suitable shape according to the focusing lens to achieve the function of fixing the focusing lens. The light after passing through the magnifying objective lens is shaped and collected by the focusing lens and then emitted from the light exit area and projected onto the imaging screen.

6. The light emitting module according to claim 4 or 5, characterized in that: The imaging screen surface is subjected to diffuse reflection processing.

7. The light emitting module according to claim 3, characterized in that: The video decoding driver board is provided with a video source decoding IC circuit and a plurality of plug ports; after the video source decoding IC circuit decodes the video source to obtain a video decoding signal, it is sent to the corresponding display unit driver board through each plug port; the video decoding driver board is electrically connected to the display unit driver board through a connector or an FPC extension cable.

8. The light emitting module according to claim 7, characterized in that: The video decoding driving board and the display unit driving board are circuit boards made of ultra-flat glass, glass fiber or BT resin substrates and have multi-layer circuits and driving ICs.

9. The light emitting module according to claim 8, characterized in that: The display unit also includes a display unit substrate, the integrated LED array chip is fixed on the display unit substrate through insulating material, and the optical amplification component is fixed on the display unit substrate corresponding to each integrated LED array chip; the front side of the display unit driving board is electrically connected to the display unit substrate in the display unit through conductive material, and the back side is provided with a plug interface, which is electrically connected to the video decoding driving board through the plug interface.

10. A display screen, characterized in that: The display screen is obtained by splicing a plurality of light-emitting modules according to any one of claims 1 to 9, and the display screen can obtain a flexible screen and a special-shaped screen by adjusting the splicing angles between the light-emitting modules.

Images