LED direct projection array light-emitting module and display screen

Abstract

The present invention discloses an LED direct projection array light-emitting module and display screen, which belongs to the field of display technology. The light-emitting module includes a video decoding driver board, a display unit driver board, a display unit and an imaging unit from bottom to top. The present invention uses semiconductor technology to integrate and miniaturize the light source of active light emission to obtain an LED integrated chip as a light source, directly controls the light source through the circuit, and then uses a magnifying lens to magnify a certain magnification according to the application scenario requirements, and then uses a 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 when the light source intensity is sufficient. At the same time, because the display source in the light-emitting module provided by the present application adopts an LED integrated chip, its size is much smaller than the existing SMD and COD splicing blocks. Therefore, when splicing into a large screen, the splicing angle can be adjusted arbitrarily to realize a flexible screen and a special-shaped screen.

Description

Technical Field

[0001] The invention relates to an LED direct projection array light emitting module and a display screen, belonging to the technical field of display. 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 certain display components 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 light passing through optical devices and then reflected from the imaging screen to reach the human eye.

[0003] LCD and OLED in direct display can achieve high pixel density, reaching retinal level (PPI of approximately 300), due to their micron-level manufacturing process, making them suitable for smart wearable products. However, in terms of pixel density and pixel size, both LCD and OLED can achieve this. Therefore, LCD and OLED direct display products are widely used in small-sized smart wearable screens of a few inches (retinal screen PPI of around 300), medium-sized computer screens of more than ten inches, and large-sized LCD TVs of dozens of inches. However, such products cannot clearly see the LCD screen information at long distances or in strong light backgrounds, and cannot be used for large screens of more than 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 the three RGB colors form color pixels. Since the 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 entire system's light efficiency is less than 10%. Low light efficiency makes the brightness of the entire LCD screen low. Although OLED is autonomous and has a higher light efficiency than LCD, OLED is an inorganic light source and the number of electrons injected cannot be large, otherwise it is very easy to burn out the light-emitting body 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 because both use the same backplane drive technology, and large backplane technology currently makes it difficult to achieve 100 inches. Furthermore, for screens larger than 100 inches, if multiple small imaging screens are spliced together, the LCD screen border will not be seamless.

[0006] In order to meet the market demand for large sizes, non-direct display projection products have emerged, which use optical systems to amplify the light source. At present, there are two types of projection technologies: LCD projection and DLP projection. LCD projection is further divided into 3LCD and LCOS. DLP uses a micro-array reflective lens chip (DMD) to drive the white light source to perform graphic pixelation (each lens of the array reflector is deflected differently and can be regarded as a different pixel), and then performs RGB color wheel filtering to form a color picture. Finally, it is amplified and projected onto the imaging screen through the 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 imaging screen is currently a large spliced screen and cannot achieve high-density pixels. It is limited by the spacing between LED lamp beads or LED chips. The smaller the spacing, the more complicated the preparation process, the larger the transfer amount and the lower the yield. At present, the LED chip spacing 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. Summary of the Invention

[0009] In order to obtain a 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.

[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; the display unit includes a display source and an optical magnification component, the display source is a monochrome or color LED integrated chip, the optical magnification component includes a magnifying objective lens and an objective lens fixing base, the LED integrated chip corresponds to the magnifying objective lens one by one, the display unit drives the display source to emit light under the action of the driving signal and amplifies and images the display content of the LED integrated chip through the optical magnification component, and the PPI of the amplified image can reach any value of 20-1000 through the combined action of the LED integrated chip and the magnifying objective lens; 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 range of the light-emitting module is 5-100mm.

[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 LED integrated chip is integrated into the multi-layer PCB circuit board and is connected to the driving circuit;

[0014] The optical amplifying component is fixed on the multi-layer PCB circuit board corresponding to each LED integrated chip.

[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 LED integrated chip is fixed on the display unit substrate by die bonding, eutectic bonding or solder paste welding, and the optical amplification component is fixed on the display unit substrate corresponding to each LED integrated 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 a display screen, which is obtained by splicing the above-mentioned multiple light-emitting modules.

[0026] 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.

[0027] The beneficial effects of the present invention are:

[0028] The present invention utilizes semiconductor technology to integrate and miniaturize active light sources to obtain LED integrated chips as light sources. The light source is directly controlled by a circuit, and then amplified by a magnifying lens according to the application scenario requirements, and then imaged on an imaging screen through a light-transmitting plate. Furthermore, a focusing lens array is provided in front of the light-transmitting plate, and each pixel is imaged and focused by the focusing lens. By combining the magnifying lens and the focusing lens, products of various sizes can be designed under sufficient light source intensity. At the same time, because the display source in the light-emitting module provided by the present application adopts an LED integrated chip, the display screen pixels are no longer limited by the LED chip pitch. For example, if the size of the LED integrated chip is 1×1 mm and the size of each internal LED chip ranges from 5 μm to 100 μm, the LED chip pitch of the final spliced display screen of the present application can easily reach 0.1 mm, and the corresponding PPI can reach 250. By selecting an appropriate magnification, the PPI range can be 20-1000, while the pixel density (PPI) of LED direct display screens at this stage is difficult to achieve 70.

[0029] Moreover, the size of each light-emitting module is much smaller than the existing SMD and COD 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.

[0030] In addition, the present application designs the size of the LED integrated chip in combination with the optical magnification so that the brightness can meet various application scenarios. That is, for imaging screens with high brightness requirements, an objective lens with a smaller magnification is used; for imaging screens with low brightness requirements, an objective lens with a larger magnification is used. By selecting the magnification, an imaging screen that can meet the brightness requirements in various application scenarios is obtained.

[0031] Furthermore, the cost of LED integrated chips is lower than that of current discrete LED chips, and can better utilize the cost advantage of the high current density of LED chips. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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 creative work.

[0033] Figure 1 This is an overall schematic diagram of a light-emitting module provided by one embodiment of the present invention;

[0034] Figure 2This 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;

[0035] Figure 3 This is an exploded view of a light-emitting module when a driving unit is implemented by a combination of a video decoding driving board and a display unit driving board, provided by one embodiment of the present invention;

[0036] Figure 4 is a cross-sectional view of a display unit in a light-emitting module provided by one embodiment of the present invention;

[0037] Figure 5 This is an exploded view of a light-emitting module when the imaging unit provided by one embodiment of the present invention includes an imaging screen and a light-transmitting plate;

[0038] Figure 6 This is a three-dimensional diagram of a light-transmitting plate in an imaging unit in a light-emitting module provided by one embodiment of the present invention;

[0039] Figure 7 This 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;

[0040] Figure 8 It is an overall cross-sectional view of a light-emitting module provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0041] Currently, small-pitch LED screens include SMD (Surface Mounted Devices) and COB (Chip On Board). SMD screens encapsulate three RGB LED chips in a single lamp bead, which is then mounted on a PCB. COB screens, on the other hand, encapsulate three RGB LED chips directly on a PCB. Therefore, SMD screens can currently achieve an LED chip pitch of P1.25, corresponding to a pixel density (PPI) of 25.4 / 1.25=20.32. COB screens can achieve an LED chip pitch of P0.6, corresponding to a PPI of 42.33. The PPI of an LCD screen is inversely proportional to the size of its imaging screen: the larger the imaging screen, the smaller the PPI. For a 55-inch LCD screen, the PPI for a 4K resolution can reach 84, and for an 8K resolution, the PPI can reach 160. This shows that although the spacing of small-pitch LED chips is small enough, it still cannot reach the high-definition level of an LCD screen.

[0042] 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 chip on the LED integrated chip, the minimum PPI can reach 847, as explained below:

[0043] Assuming that the magnification of the magnifying lens is 1 and the distance between each LED chip on the LED integrated chip is 30 μm, then PPI = 25.4×1000 mm / 30 = 847.

[0044] By selecting a magnifying objective lens with other magnifications and an LED integrated chip with other LED chip sizes, the present application solution can produce an imaging screen with a higher PPI value.

[0045] The selection of a magnifying objective lens with a specific magnification can be determined based on the brightness requirements of the final imaging screen.

[0046] 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.

[0047] Example 1:

[0048] This embodiment provides an LED direct display projection array light emitting module, see Figure 1 , the light emitting module includes:

[0049] A driving unit 1 , a display unit 2 and an imaging unit 3 ; the display unit 2 is driven by a signal from the driving unit 1 to display an image on the imaging unit 3 .

[0050] Among them, 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 2; the display unit 2 includes a display source 23 and an optical magnification component, and the display source 23 is a monochrome or color LED integrated chip; the optical magnification component includes a magnifying objective lens 22 and an objective lens fixing base 21. The LED integrated chip corresponds to the magnifying objective lens one by one, that is, each LED integrated chip uses a magnifying objective lens to magnify and image its display content.

[0051] 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 LED integrated chip through the optical amplification component.

[0052] The imaging unit 3 includes an imaging screen 31 , and is configured to receive the image magnified by the display unit 2 and image the image on the imaging screen 31 .

[0053] The overall thickness of the light-emitting module ranges from 5 to 100 mm.

[0054] 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 drive board 11 and a display unit drive board 12. The following describes these two implementations using the second and third embodiments respectively:

[0055] Example 2:

[0056] This embodiment provides an LED direct display projection array light emitting module, see Figure 2 In this light-emitting module, the driving unit 1 is implemented using a multi-layer PCB circuit board, on which a corresponding video source decoding IC circuit and a driving circuit are provided; the LED integrated chip serving as the display source 23 is integrated on the multi-layer PCB circuit board and connected to the driving circuit, and emits light under the drive of the electrical signal of the driving circuit. Each light-emitting point in the LED integrated chip can emit light independently under the drive of the electrical signal.

[0057] The optical magnification assembly is fixed to a multi-layer PCB circuit board corresponding to each LED integrated chip, allowing light emitted by the LED integrated chip to pass through the magnifying lens and thereby amplify the resulting image. Each LED integrated chip corresponds to one magnifying lens. Specifically, after the display source 23 is soldered to the multi-layer PCB circuit board via wire bonding or through-hole soldering, the objective lens fixing base 21 is fixed to the multi-layer PCB circuit board using an adhesive material such as glue. The objective lens fixing base 21 is configured to accommodate the shape of the magnifying lens. The objective lens fixing base 21 secures the magnifying lens 22 to the display source 23. A light emitting area is provided above the objective lens fixing base 21. Light emitted by the display source 23 passes through the magnifying lens and is emitted from the light emitting area. The objective lens fixing base 21 has a black outer shell, which not only protects the objective lens but also prevents stray light from interfering with imaging.

[0058] 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, but in actual application, multiple objective lens fixing bases 21 can be prepared in one piece according to the requirements of the preparation process.

[0059] Example 3:

[0060] This embodiment provides an LED direct display projection array light emitting module, see Figure 3In this light-emitting module, the driving unit 1 is implemented by 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 video decoding signal into an electrical signal for driving a single display unit, that is, a driving signal. Each light-emitting point in the LED integrated chip can emit light independently under the drive of the electrical signal.

[0061] 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.

[0062] like Figure 3 As shown, the display unit 2 includes, in addition to the display source 23 and the optical magnification component (the optical magnification component includes the magnifying objective lens 22 and the objective lens fixing base 21), a display unit substrate 24. The LED integrated chip serving as the display source 23 is soldered to the display unit substrate 24 via welding wires or through holes. The front side of the display unit driving board 12 can be 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 driving board 11 via the plug interface.

[0063] Typically, the conductive material may be solder paste, silver glue, or the like.

[0064] The objective lens fixing base 21 is also fixed on the display unit substrate 24 by adhesive materials such as glue. Figure 4 As shown, the objective lens mounting base 21 is structured to accommodate the shape of the magnifying objective lens. It secures the 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 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 imaging.

[0065] Example 4:

[0066] 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.

[0067] See also Figure 5 , the light emitting module includes:

[0068] 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; wherein the drive unit 1 is used to generate a drive signal based on the image or video to be displayed and transmit the drive signal to the display unit 2; the display unit 2 includes a display source 23 and an optical magnification component, the display source 23 is a monochrome or color LED integrated chip, the optical magnification component includes a magnifying objective lens 22 and an objective lens fixing base 21, the LED integrated chips correspond to the magnifying objective lenses one by one, that is, each LED integrated chip uses a magnifying objective lens to magnify and image its display content.

[0069] 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 LED integrated chip through the optical amplification component; the imaging unit 3 includes an imaging screen 31, which is used to receive the image amplified by the display unit 2 and image it on the imaging screen 31.

[0070] It should be noted that in order to ensure that the magnifying lens 22 can magnify the display content of the LED integrated chip and image it on the imaging screen 31 , the LED integrated chip needs to be set within the range of 1-2 times the focal length of the magnifying lens 22 .

[0071] 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 other areas are 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.

[0072] If the imaging screen 31 is made of a material with no supporting force, such as plastic, then in order to improve the supporting force of the imaging screen, a light-transmitting plate can be provided to improve the supporting force of the imaging screen, such as Figure 5 As shown, in one embodiment, the imaging unit 3 further includes a light-transmitting plate 32, which is disposed between the display unit 2 and the imaging screen 31. Figure 6As shown, 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, and 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 materials; if the light-transmitting plate 32 is made of non-transparent materials, the light emitting area 321 can be realized by opening holes, and 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.

[0073] In order to further improve the utilization of light, Figure 7 As shown, 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 function 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-emitting area and projected onto the imaging screen 31.

[0074] 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.

[0075] In practical applications, the correspondence between the display unit driver board 12 and the display unit 3 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 imaging screen.

[0076] like Figure 8 The figure shows how two pixels in a monochromatic LED integrated chip are magnified several times by an optical amplification component, and 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 emission of light, thereby improving the viewing angle.

[0077] 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, and the overall thickness generally ranges from 5 to 100 mm. When manufacturing a display screen, the thickness d of the light-emitting module is negligible relative to the thickness of the supporting structure of the imaging screen, 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 the magnifying objective lens, it will not increase the thickness of the final imaging screen.

[0078] 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.

[0079] Example 5

[0080] This embodiment provides a display screen, which is obtained by splicing multiple LED direct display projection array light-emitting modules provided in Example 1. By adjusting the splicing angles between the light-emitting modules, a flexible screen and a special-shaped screen can be obtained.

[0081] Because the display source in the light-emitting module uses LED integrated chips, the number of LED integrated chips required to achieve the same pixel resolution is far less than that of a single LED chip, thereby reducing the assembly time of the imaging screen and reducing production costs. By selecting the magnification of the magnifying lens, the imaging screen can be adapted to different brightness requirements.

[0082] For example, assuming that the display source 33 uses a 20×20 monochrome LED integrated chip, if a pixel resolution of 2000*1000 is to be obtained, it is necessary to use a combination of 100*50 array light sources. In the prior art, 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 scheme is easier to implement, and the greatly reduced transfer amount will directly greatly improve the product yield.

[0083] In addition, the size of each light-emitting module of the present application is much smaller than the existing SMD and COB splicing blocks, so when splicing into a large screen, the splicing angle can be adjusted arbitrarily to realize flexible screens and special-shaped screens.

[0084] If the final display screen is required to be a monochrome screen, it can be obtained by splicing multiple LED direct display projection array light-emitting modules provided in any one of Examples 1 to 4, and the display source is prepared using a monochrome LED integrated chip.

[0085] If the final display screen is required to be a color screen, it can be obtained by splicing multiple LED direct display projection array light-emitting modules provided in any one of Examples 1 to 4, and the display source is prepared using a color LED integrated chip.

[0086] 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.

[0087] 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 includes: a driving unit, a display unit and an imaging unit; The driving unit is configured to generate a driving signal according to the image or video to be displayed, and transmit the driving signal to the display unit; The display unit includes a display source and an optical amplification component. The display source is a monochrome or color LED integrated chip. The optical amplification component includes a magnifying lens and an objective lens fixing base. The LED integrated chip corresponds to the magnifying lens in a one-to-one manner. The display unit drives the display source to emit light under the action of the driving signal and amplifies and images the display content of the LED integrated chip through the optical amplification component. The imaging unit includes an imaging screen, a focusing lens array, and a light-transmitting plate. The imaging unit is used to receive the image magnified by the display unit and form an image on the imaging screen. The number of focusing lenses in the focusing lens array is the same as the number of display sources in the corresponding display units. The light-transmitting plate is provided with a light-emitting area corresponding to each display unit, and the number of the light-emitting areas is the same as the number of the display units. The display unit is driven by the driving signal of the driving unit to display an image on the imaging unit. The light signal of the LED integrated chip is amplified by the magnifying lens and focused by the focusing lens, and finally forms an image on the imaging screen. Through the combined effect of the LED integrated chip and the magnifying objective lens, and by adjusting the magnification of the magnifying objective lens and the size of the LED integrated chip, the PPI of the magnified image can reach any value between 20 and 1000. Assuming that the magnification of the magnifying objective lens is 1 and the spacing between the LED chips on the LED integrated chip is 30 μm, then PPI = 25.4 × 1000 mm / 30 = 847; the thickness range of the light-emitting module is 5-100 mm.

2. The light emitting module according to claim 1, wherein: 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 provided; The LED integrated chip is integrated into the multi-layer PCB circuit board and is connected to the driving circuit; The optical amplifying component is fixed on the multi-layer PCB circuit board corresponding to each LED integrated chip.

3. The light emitting module according to claim 1, wherein: 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 to drive a single display unit.

4. The light emitting module according to claim 1, wherein: The light-transmitting plate is arranged between the display unit and the imaging screen.

5. The light emitting module according to claim 4, characterized in that: The focusing lens array is arranged 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.

6. The light emitting module according to claim 4 or 5, characterized in that: The surface of the imaging screen 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 multiple plug-in 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-in 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 substrate and have multi-layer circuits and driving ICs.

9. The light emitting module according to claim 8, characterized in that: The display unit further includes a display unit substrate, the LED integrated chip is fixed on the display unit substrate by die bonding, eutectic bonding or solder paste welding, and the optical amplification component is fixed on the display unit substrate corresponding to each LED integrated chip; 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.

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. The display screen can be obtained by adjusting the splicing angles between the light-emitting modules to obtain a flexible screen and a special-shaped screen.

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