Spliced display screen and display equipment
By using splicing display technology, small display panels are spliced together to form a large screen, and lens arrays are used to block non-display areas, solving the problem of high cost of silicon-based OLED displays, achieving cost reduction, yield improvement, and optimized display effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2026-03-31
AI Technical Summary
VR and MR devices based on silicon-based OLED displays are expensive and difficult to commercialize on a large scale, mainly due to the high material costs and low yield rates caused by the limited display area.
By using splicing display technology, multiple small display panels are spliced together to form a large screen, and a lens array is set on the light-emitting side of each display panel. The image formed by the lens array blocks the non-display area, thus alleviating or eliminating the splicing seam.
It reduces the manufacturing cost of display devices, improves the yield rate, and enhances the display effect by reducing or eliminating splicing seams through lens arrays.
Smart Images
Figure CN121768285A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of display technology, and in particular to a splicing display screen and display device. Background Technology
[0002] With the rapid development of display technology, head-mounted displays (HMDs) have been widely used in various fields such as gaming, sports, film, and medicine. Head-mounted displays generally include: virtual reality (VR) devices, augmented reality (AR) devices, and mixed reality (MR) devices.
[0003] Silicon-based organic light-emitting diode (OLED) displays have ultra-high pixel density (pixels per inch, PPI), and can be compatible with small and thin form factors and high resolution while having advantages such as high color gamut and high brightness. Therefore, silicon-based OLED displays are very suitable for use in head-mounted display devices and are increasingly favored by head-mounted display manufacturers in the industry.
[0004] However, VR and MR devices based on silicon-based OLED displays are difficult to commercialize on a large scale. This is because VR and MR devices require displays with a large field of view (FoV), necessitating a large display area. The silicon backplane of silicon-based OLED displays is fabricated using semiconductor processes, and the display area is limited by the manufacturing process. Therefore, the larger the display area, the higher the material cost and the lower the yield. Consequently, VR and MR devices based on silicon-based OLED displays are expensive and difficult to commercialize on a large scale. Summary of the Invention
[0005] This application provides a splicing display screen and a display device to reduce the cost of the display device and improve the yield of the display device.
[0006] In a first aspect, embodiments of this application provide a video wall display screen, which may include at least two display panels and a lens array. The display panels in the video wall display screen are spliced together, and each display panel has a display area and a non-display area. The display area of the display panel is provided with pixels for display, and the non-display area is provided with components such as circuits and signal lines. The lens array is located on the light-emitting side of each display panel. The lens array is used to magnify the display surface of each display panel and to image the emitted light from each display panel on the light-emitting side of the lens array. The image formed by the lens array covers the display area of each display panel and blocks at least a portion of the non-display area of each display panel.
[0007] In related technologies, the larger the display area of a silicon-based OLED display, the higher the material cost and the lower the yield, resulting in high costs and expensive prices for VR and MR devices based on silicon-based OLED displays, making large-scale commercialization difficult. The technical solution provided in this application involves splicing the display panels together, allowing smaller display panels to be combined into a larger display. Since smaller display panels have lower costs and higher yields, using splicing display panels can overcome manufacturing process limitations, reduce the manufacturing cost of display devices, and improve the yield. Furthermore, in this application embodiment, by setting a lens array on the light-emitting side of each display panel, the image formed by the lens array can block at least a portion of the non-display area of each display panel, thereby alleviating or eliminating the seams between display panels and giving the display device a better display effect.
[0008] In this embodiment, the display panels in the splicing display screen are spliced together to obtain a larger display screen, for example, a display screen with a display area greater than 1 inch. For example, taking four display panels spliced together in a 2×2 configuration, if each display panel is 0.7 inches in size, then the four display panels can be spliced together to form a 1.4-inch display screen. In specific settings, the number and size of the display panels in the splicing display screen can be reasonably set according to actual needs, and there is no limitation here.
[0009] In one possible implementation, the lens array may include at least two lens groups, with one lens group disposed on the light-emitting side of each display panel, and the lens groups positioned at the corresponding display area of the display panel. During the display process of the spliced display screen, the display panel emits light from its display area, and the light passes through the lens group at the corresponding position to form an image on the light-emitting side of the spliced display screen. The lens group can magnify the display surface of the display panel, and the image formed by the lens group can cover the display area of the corresponding display panel and block at least a portion of the non-display area of the corresponding display panel, thereby effectively concealing the seams between the display panels.
[0010] In specific implementations, when the splicing display screen of this application embodiment is applied to a display device, the display device may further include: an optical lens group located on the light-emitting side of the splicing display screen. The optical lens group may include at least one lens, and the optical lens group can play a converging role. The light emitted from the display panel is imaged on the light-emitting side of the splicing display screen after passing through the lens array, and the light then enters the human eye through the optical lens group. In this application embodiment, by setting the lens array on the light-emitting side of each display panel, the image formed by the lens array can block the seam between the display panels, thereby reducing or eliminating the seam visible to the human eye. For example, the seam can be reduced from the millimeter level (e.g., about 2 millimeters) to the micrometer level (e.g., tens of micrometers).
[0011] In specific setups, by appropriately adjusting the optical parameters of the lens array, the area of the image formed by the lens array can be made essentially the same as the display surface of the splicing display screen. That is, the area of the image formed by the lens array is essentially the same as the sum of the display and non-display areas of each display panel. This allows the image formed by the lens array to nearly completely block the non-display areas of each display panel, resulting in better seam coverage and even eliminating the seams altogether.
[0012] In this embodiment, the lens array can magnify the display surface of the display panel, and the magnification of the lens array can be in the range of 1 to 2. This setting can avoid the image formed by the lens array being too large, which would cause the images of adjacent display panels to overlap, thereby ensuring that the display device has a better display effect. In one possible implementation, the display panel has multiple pixels in the display area, and each lens in the lens array 101 can cover 1×1 to 10×10 pixels.
[0013] In one possible implementation, the radius of curvature of each lens in the lens array can be in the range of 5µm to 50µm, and the refractive index of the lens array can be in the range of 1.4 to 2. By reasonably setting the optical parameters of the lens array, the effect of masking seams in the image formed by the lens array can be improved.
[0014] In practical implementation, the position of the image formed by the lens array can be controlled by reasonably setting the focal length of the lens array. When the display device in this embodiment is a head-mounted display device, the focal length of the lens array can be set so that the display surface of the display panel, after passing through the lens array, forms an image at a position 0-10mm away from the light-emitting surface of the lens array, making it easier for the human eye to view the image formed by the lens array. Specifically, the focal length of the lens array can be determined using the following relationship:
[0015] It can be deduced that:
[0016] Where f represents the focal length of the lens array; a represents the object distance, which is the distance between the display surface of the display panel and the light-emitting surface of the lens array; and b represents the image distance, which is the distance between the light-emitting surface of the lens array and the image surface.
[0017] In the manufacturing process, processes such as deposition, spin coating, and baking can be used to create lens arrays on the surface of each display panel; alternatively, the lens arrays can be made into sheets or layers and then attached to the surface of each display panel.
[0018] In this embodiment, the display panel can be a silicon-based OLED display panel. Because silicon-based OLED display panels have advantages such as high pixel density, high color gamut, high brightness, high resolution, and small and thin form factor, they are suitable for use in head-mounted display devices. Furthermore, the technical solution provided in this embodiment reduces the cost of the display device and improves its yield by splicing display panels. Therefore, the technical solution in this embodiment can reduce the cost of VR and MR devices based on silicon-based OLED displays, which is beneficial for large-scale commercialization. Of course, the display panel in this embodiment can also be other types of display panels such as liquid crystal displays (LCDs) or active-matrix organic light-emitting diodes (AMOLEDs), which can be set according to actual needs.
[0019] In some embodiments of this application, the display panels in the splicing display screen can be configured to have the same shape and substantially the same size. This allows for mass production of the display panels and lens arrays during manufacturing, improving production efficiency. In other embodiments of this application, the splicing display screen may include a first display panel and at least two second display panels, with the first display panel located at the center of the splicing display screen and each second display panel surrounding the first display panel. Since the human eye primarily focuses on the central area of a display device when viewing it, meaning the central area is more sensitive to human vision, in the embodiments of this application, by setting a single first display panel at the center of the splicing display screen, the central area of the splicing display screen can be seamless, with the seams located in the peripheral area where the human eye is less sensitive. This reduces the requirements for seam seams and thus lowers the difficulty of seam seam processing.
[0020] In practical applications, lens arrays may have certain tolerances during manufacturing, leading to under- or over-stitching in the image. When under-stitching occurs, a blank area appears between the images of adjacent display panels. Since this blank area does not emit light, its brightness is significantly lower than that of images one and two. For example, if images one and two have a brightness of 100 nits each, the blank area will have a brightness of 0 nits, resulting in a noticeable dark seam between images one and two. When over-stitching occurs, an overlapping area appears between the images of adjacent display panels. Because the overlapping area combines the brightness of the images from both display panels, its brightness is significantly higher than that of images one and two. For example, if images one and two have a brightness of 100 nits each, the overlapping area will have a brightness of 200 nits, resulting in a noticeable bright seam between images one and two.
[0021] In some embodiments of this application, the aforementioned problems of under-splicing and over-splicing can be solved by setting redundant pixels in the display panel. The display panel may include pixel areas, with the display area located within the pixel areas, and the area outside the display area being the redundant pixel area. In specific settings, the size and position of the redundant pixel area can be reasonably set according to actual needs. For example, the width of the redundant pixel area in a single direction can be set to 10-50 pixels. Both the display area and the redundant pixel area are provided with pixels for display; by setting the redundant pixel area, the display area can be moved within the pixel area. For example… Figure 9 The display panel is located in the middle of the pixel area. Taking the initial state where the display area is located in the center of the pixel area as an example, the display area can be moved up, down, left, or right by controlling a part of the pixels in the pixel area to be displayed normally and another part of the pixels not to be displayed.
[0022] When the image formed by the lens array is under-stitched, blank areas appear in the images corresponding to two adjacent display panels. These blank areas can be reduced or eliminated by controlling the display areas of these two display panels to move in opposite directions. Conversely, when the image formed by the lens array is over-stitched, overlapping areas appear in the images corresponding to two adjacent display panels. These overlapping areas can be reduced or eliminated by controlling the display areas of these two display panels to move in opposite directions. In practical implementation, when multiple display panels are set in a splicing display screen, the display areas of the display panels can be moved in a similar manner; further examples are not provided here.
[0023] In some embodiments of this application, by setting redundant pixels in the display panel, the movement of the display area in the display panel can be controlled, with the minimum precision of the display area movement being the width of one pixel. After the display area in the display panel is moved, the display area deviates from the exact center of the pixel area. Therefore, blank or overlapping areas in the image can be reduced or eliminated, further reducing or eliminating the seams visible to the human eye; for example, the seams can be reduced to a few micrometers.
[0024] In other embodiments of this application, for cases with small seams, such as seams of a few micrometers, brightness compensation can be used to reduce or eliminate the seams. The splicing display screen in this application embodiment may include: a first display panel and a second display panel arranged adjacent to each other. The splicing display screen may also include: a processor. In some cases, the images corresponding to the first display panel and the second display panel have an overlapping area at the splicing position. The processor can be used to control the first display panel to display at a first brightness at the center position of the display area and at a second brightness at the position of the display area corresponding to the overlapping area, wherein the first brightness is greater than the second brightness. For example, the first brightness may be approximately twice the second brightness. The processor can also be used to control the second display panel to display at a third brightness at the center position of the display area and at a fourth brightness at the position of the display area corresponding to the overlapping area, wherein the third brightness is greater than the fourth brightness. For example, the third brightness may be approximately twice the fourth brightness. Thus, by reducing the brightness of the display area at the splicing position, the brightness difference between the overlapping area and other areas in the image of the lens array can be reduced, thereby alleviating or eliminating the seams.
[0025] In practice, the display brightness of pixels in the display area can be changed by altering their grayscale levels. The grayscale level of pixels corresponding to the overlapping area can be determined by the following formula:
[0026]
[0027] Where G1 represents the corrected grayscale value, G0 represents the original grayscale value, k represents the gamma exponent, which is related to the corresponding parameters of the display device; for example, k can be 2.2. U represents the ratio of the corrected to the original brightness; for example, U can be 0.5. For instance, when k = 2.2 and U = 0.5, G1 = 0.73G0 is calculated. In practical implementation, the ratio of the corrected to the original brightness can be set appropriately according to actual needs.
[0028] In other embodiments of this application, for cases with small bezels, such as bezels of a few micrometers, image content compensation can be used to reduce or eliminate the bezels. The splicing display screen in this application embodiment may include: a first display panel and a second display panel arranged adjacent to each other. The splicing display screen may also include: a processor. In some cases, the images corresponding to the first display panel and the second display panel have an overlapping area at the splicing position. The processor can be used to blur the displayed images of the first display panel and the second display panel at the splicing position. For example, upsampling algorithms or similar methods can be used to blur the image. For cases with small bezels, one row (or one column) of pixels at the splicing position can be blurred. Of course, multiple rows (or multiple columns) of pixels can also be blurred, depending on actual needs. In this application embodiment, by blurring the displayed image at the splicing position, the image difference between the splicing position and other areas can be alleviated, thereby mitigating or eliminating the bezel.
[0029] The above describes various ways to alleviate or eliminate seams. In practice, these methods can be combined and adjusted according to actual needs. These will not be elaborated on here.
[0030] Secondly, this application also provides a display device. The display device in this application can be a head-mounted display (HMD) such as a virtual reality (VR) device, augmented reality (AR) device, or mixed reality (MR) device. Alternatively, the display device in this application can be a smartwatch, smart bracelet, smart glasses, or other smart wearable device. It can also be a smartphone, tablet, smart TV, or other terminal device. Of course, the splicing display screen in this application can also be applied to other display devices, which will not be listed here.
[0031] The display device provided in this application embodiment may include: any of the splicing display screens in the first aspect described above and a circuit board. The splicing display screen is electrically connected to the circuit board, and the circuit board can be used to transmit signals controlling the display of the splicing display screen. For example, the circuit board may be a flexible printed circuit board (FPC). Since any of the splicing display screens in the first aspect described above is provided with at least two display panels that are spliced together, smaller display panels can be spliced together to form a larger display screen. Therefore, the limitations of the manufacturing process can be overcome, the manufacturing cost of the display device can be reduced, and the yield rate of the display device can be improved. Attached Figure Description
[0032] Figure 1 This is a schematic diagram of the structure of a display device provided in an embodiment of this application;
[0033] Figure 2 This is another structural schematic diagram of the display device provided in an embodiment of this application;
[0034] Figure 3 This is a schematic diagram of the structure of the splicing display screen provided in the embodiments of this application;
[0035] Figure 4 for Figure 3 A schematic diagram of the cross-section at the dashed line LL';
[0036] Figure 5 This is another structural schematic diagram of the display device provided in an embodiment of this application;
[0037] Figure 6 This is another structural schematic diagram of the splicing display screen provided in the embodiments of this application;
[0038] Figure 7 This is another structural schematic diagram of the splicing display screen provided in the embodiments of this application;
[0039] Figure 8 This is a schematic diagram of the lens array imaging in an embodiment of this application;
[0040] Figure 9 This is a schematic diagram illustrating the implementation of redundant pixels in an embodiment of this application;
[0041] Figure 10 This is a schematic diagram illustrating the movement process of the display area in an embodiment of this application;
[0042] Figure 11 This is a schematic diagram illustrating another movement process of the display area in an embodiment of this application;
[0043] Figure 12 This is another structural schematic diagram of the splicing display screen provided in the embodiments of this application;
[0044] Figure 13 This is another structural schematic diagram of the splicing display screen provided in an embodiment of this application.
[0045] Figure label:
[0046] 10-Splicing display screen; 101-Display panel; 1011-First display panel; 1012-Second display panel; 102-Lens array; 103-Protective layer; 11-Housing; 12-Wearing component; 121-Fixing bracket; 122-Top strap; 123-Side strap; 13-Head; 14-Circuit board; 15-Optical lens group; 16-Eyes; 20-Silicon-based backplate; 21-Light-emitting layer; 211-First light-emitting layer; 212-Second light-emitting layer; 213-Third light-emitting layer; 22-First electrode; 23-Second electrode; 24-Encapsulation layer; 25-Color filter layer; 26-Lens layer; 27-Protective cover; A-Display area; B-Non-display area; C-Pixel area; D-Redundant pixel area; m-Lens group. Detailed Implementation
[0047] Head-mounted display (HMD) devices generally include: virtual reality (VR) devices, augmented reality (AR) devices, and mixed reality (MR) devices. VR devices use image rendering to create a three-dimensional virtual world, providing users with simulations of visual and other sensory experiences, making them feel as if they are actually there, able to observe objects in three-dimensional space instantly and without restrictions. VR devices integrate multiple technologies such as computer graphics, computer simulation, artificial intelligence, sensing, display, and network parallel processing; it is a high-tech simulation system generated with the assistance of computer technology. AR devices combine VR technology with real-world images, overlaying VR technology onto real-world images to achieve a fusion of virtual and real effects. MR devices are VR devices with video see-through (VST) functionality. This VST function allows users to see images of the real world through a camera, enabling experiences of virtual scenes, real scenes, and fusion of virtual and real scenes.
[0048] Silicon-based organic light-emitting diode (OLED) displays have ultra-high pixel density (pixels per inch, PPI), and can be compatible with small and thin form factors and high resolution while having advantages such as high color gamut and high brightness. Therefore, silicon-based OLED displays are very suitable for use in head-mounted display devices and are increasingly favored by head-mounted display manufacturers in the industry.
[0049] In related technologies, silicon-based OLED displays are mainly used in AR devices with lower requirements for field of view (FoV). VR and MR devices based on silicon-based OLED displays are difficult to commercialize on a large scale because they have high requirements for image display, typically requiring high resolution, a large FoV, a high refresh rate, and low latency. The large FoV requirement of VR and MR devices necessitates a large display area, usually greater than 1 inch. However, the silicon backplane of silicon-based OLED displays is fabricated using semiconductor processes. The display area of silicon-based OLED displays is limited by the manufacturing process, meaning that the larger the display area, the higher the material cost and the lower the yield. The price of silicon-based OLED displays is typically more than 20 times that of liquid crystal displays (LCDs) or active matrix organic light emitting diode (AMOLEDs) displays of the same size. Therefore, VR and MR devices based on silicon-based OLED displays are expensive and difficult to commercialize on a large scale.
[0050] Based on this, in order to reduce the cost and improve the yield of display devices, embodiments of this application provide a splicing display screen and a display device. The splicing display screen provided in this application embodiment can be applied to various types of display devices, such as head-mounted displays (HMDs) like virtual reality (VR), augmented reality (AR), and mixed reality (MR) devices; or smart wearable devices like smartwatches, smart bracelets, and smart glasses; or terminal devices like smartphones, tablets, and smart TVs. Of course, the splicing display screen in this application embodiment can also be applied to other display devices, which will not be listed here.
[0051] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.
[0052] It should be noted that the accompanying drawings in this application are for illustrative purposes only and do not represent actual scale. The same reference numerals in the accompanying drawings denote the same or similar structures, and therefore, repeated descriptions of them will be omitted.
[0053] The terms describing position and direction used in this application, such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," are merely illustrative examples based on the orientation or positional relationships shown in the accompanying drawings. They are intended solely for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Changes may be made as needed, and all such changes are included within the scope of protection of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0054] Figure 1 This is a schematic diagram of the structure of the display device provided in the embodiments of this application, such as... Figure 1 As shown, taking a head-mounted display device as an example in this application embodiment, the display device provided in this application embodiment may include: a splicing display screen 10 and a housing 11, wherein the splicing display screen 10 may be disposed inside the housing 11. For ease of wearing, the display device in this application embodiment may further include: a wearing component 12. The housing 11 and the wearing component 12 are connected, forming a receiving space for accommodating the user's head 13. When the user wears the head-mounted display device, the splicing display screen 10 may be positioned in front of the user's eyes so that the user can view the displayed image on the splicing display screen 10. The wearing component 12 may include: a fixing bracket 121, and at least one of a top strap 122 and a side strap 123. The fixing bracket 121 is connected to the top strap 122 and the side strap 123. For example, the fixing bracket 121 may be positioned corresponding to the back of the user's head. The length of the top strap 122 and / or the side strap 123 may be adjusted so that the wearing component 12 can adapt to the usage needs of different head circumferences. Of course, the wearing component 12 can also be a headrest or other form, as long as it can achieve the wearing function.
[0055] Figure 2 This is another structural schematic diagram of the display device provided in the embodiments of this application, as shown below. Figure 2 As shown, the display device in this embodiment may further include a circuit board 14, with the splicing display screen 10 electrically connected to the circuit board 14. The circuit board 14 can be used to transmit signals controlling the display of the splicing display screen 10. Exemplarily, the circuit board 14 may be a flexible printed circuit board (FPC).
[0056] Figure 3 This is a schematic diagram of the structure of the splicing display screen provided in the embodiments of this application. Figure 4 for Figure 3 A schematic diagram of the cross-section at the dashed line LL', combined with... Figure 3 and Figure 4The splicing display screen 10 provided in this application embodiment may include at least two display panels 101 and a lens array 102. The display panels 101 in the splicing display screen 10 are spliced together, and each display panel 101 has a display area A and a non-display area B. The display area A of the display panel 101 is provided with pixels for display, and the non-display area B is provided with components such as circuits and signal lines. The lens array 102 is located on the light-emitting side of each display panel 101. The lens array 102 is used to magnify the display surface of each display panel 101 and to image the emitted light from each display panel 101 on the light-emitting side of the lens array 102. For example, it can be used to... Figure 4 Image is formed at the position indicated by the middle arrow W. The image formed by the lens array 102 covers the display area A of each display panel 101 and blocks at least a portion of the non-display area B of each display panel 101.
[0057] In related technologies, the larger the display area of a silicon-based OLED display, the higher the material cost and the lower the yield, resulting in high costs and expensive prices for VR and MR devices based on silicon-based OLED displays, making large-scale commercialization difficult. In the technical solution provided in this application embodiment, the display panels 101 in the splicing display screen 10 are spliced together, allowing smaller display panels 101 to be combined into a larger display screen. Since smaller display panels 101 have lower costs and higher yields, using splicing display panels 101 can overcome manufacturing process limitations, reduce the manufacturing cost of display devices, and improve the yield of display devices. Furthermore, in this application embodiment, by setting a lens array 102 on the light-emitting side of each display panel 101, the image formed by the lens array 102 can block at least a portion of the non-display area B of each display panel 101, thereby alleviating or eliminating the seams between the display panels 101 and giving the display device a better display effect.
[0058] In this embodiment of the application, the display panels 101 in the splicing display screen 10 are spliced together to obtain a larger display screen, for example, a display screen with a display area greater than 1 inch. For example, in Figure 3 In the splicing display screen 10 shown, taking four display panels 101 spliced together in a 2×2 configuration as an example, if the size of each display panel 101 is 0.7 inches, then the four display panels 101 can be spliced together to form a 1.4-inch display screen. In specific settings, the number and size of the display panels 101 in the splicing display screen 10 can be reasonably set according to actual needs, and no limitation is made here.
[0059] In one possible implementation, such as Figure 4As shown, the lens array 102 may include at least two lens groups m. Each display panel 101 has one lens group m on its light-emitting side, and the lens group m is positioned at the corresponding display area A of the display panel 101. During the display process of the splicing display screen 10, the display panel 101 emits light from the display area A. After passing through the lens group m at the corresponding position, the light is imaged on the light-emitting side of the splicing display screen 10. The lens group m can magnify the display surface of the display panel 101, and the image formed by the lens group m (e.g., ...) Figure 4 The image (indicated by the middle arrow W) can cover the display area A of the corresponding display panel 101 and block at least a portion of the non-display area B of the corresponding display panel 101, thereby blocking the seam between the display panels 101.
[0060] Figure 5 This is another structural schematic diagram of the display device provided in the embodiments of this application, as shown below. Figure 5 As shown, the display device in this embodiment may further include an optical lens group 15 located on the light-emitting side of the splicing display screen 10. The optical lens group 15 may include at least one lens and can act as a converging lens. The light emitted from the display panel 101 is imaged on the light-emitting side of the splicing display screen 10 after passing through the lens array 102, and the light then enters the human eye 16 through the optical lens group 15. In this embodiment, by setting the lens array 102 on the light-emitting side of each display panel 101, the image formed by the lens array 102 can block the seam between the display panels 101, thereby reducing or eliminating the seam seen by the human eye 16. For example, the seam can be reduced from the millimeter level (e.g., about 2 millimeters) to the micrometer level (e.g., tens of micrometers).
[0061] In specific configurations, by appropriately setting the optical parameters of the lens array 102, the area of the image formed by the lens array 102 can be made substantially consistent with the area of the display surface of the splicing display screen 10. That is, the area of the image formed by the lens array 102 is substantially consistent with the sum of the display areas A and non-display areas B of each display panel 101. This allows the image formed by the lens array 102 to almost completely block the non-display areas B of each display panel 101, resulting in better seam coverage and even the elimination of seams.
[0062] Figure 6 This is another structural schematic diagram of the splicing display screen provided in the embodiments of this application, as shown below. Figure 6As shown, the lens array 102 can magnify the display surface of the display panel 101, and the magnification of the lens array 102 can be in the range of 1 to 2. This configuration avoids the image formed by the lens array 102 being too large, which could cause overlapping of images from adjacent display panels 101, thus ensuring a better display effect. In one possible implementation, the display panel 101 has multiple pixels in the display area, and each lens in the lens array 102 can cover 1×1 to 10×10 pixels.
[0063] In one possible implementation, the radius of curvature of each lens in the lens array 102 can be in the range of 5µm to 50µm, and the refractive index of the lens array 102 can be in the range of 1.4 to 2. By reasonably setting the optical parameters of the lens array 102, the effect of masking the stitching seam in the image formed by the lens array 102 can be improved.
[0064] In practical implementation, the position of the image formed by the lens array 102 can be controlled by reasonably setting the focal length of the lens array 102. When the display device in this embodiment is a head-mounted display device, the focal length of the lens array 102 can be set so that the display surface of the display panel 101, after passing through the lens array 102, forms an image at a position 0-10mm away from the light-emitting surface of the lens array 102, making it easier for the human eye to view the image formed by the lens array 102. Specifically, the focal length of the lens array 102 can be determined by the following relationship:
[0065] It can be deduced that:
[0066] Where f represents the focal length of the lens array 102; a represents the object distance, which is the distance between the display surface of the display panel 101 and the light-emitting surface of the lens array 102; and b represents the image distance, which is the distance between the light-emitting surface of the lens array 102 and the image surface.
[0067] In the manufacturing process, processes such as deposition, spin coating, and baking can be used to fabricate the lens array 102 on the surface of each display panel 101; or, the lens array 102 can be fabricated as a sheet or layer and then attached to the surface of each display panel 101.
[0068] In the embodiments of this application, reference continues to be made to Figure 6The display panel in this embodiment can be a silicon-based OLED display panel. Because silicon-based OLED display panels have advantages such as high pixel density, high color gamut, high brightness, high resolution, and small and thin form factor, they are suitable for use in head-mounted display devices. Furthermore, the technical solution provided in this embodiment reduces the cost of the display device and improves its yield by splicing the display panels 101. Therefore, the technical solution in this embodiment can reduce the cost of VR and MR devices based on silicon-based OLED displays, which is beneficial for large-scale commercialization.
[0069] In one possible implementation, the silicon-based OLED display panel may include: a silicon-based backplane 20, a light-emitting layer 21, multiple first electrodes 22, second electrodes 23, an encapsulation layer 24, a color filter layer 25, a lens layer 26, and a protective cover plate 27. The first electrodes 22 are anodes, and the second electrodes 23 are cathodes; or, the first electrodes 22 are cathodes, and the second electrodes 23 are anodes. The light-emitting layer 21 may include: a first light-emitting layer 211, a second light-emitting layer 212, and a third light-emitting layer 213 stacked together. The first light-emitting layer 211, the second light-emitting layer 212, and the third light-emitting layer 213 may include different light-emitting materials, and the first light-emitting layer 211, the second light-emitting layer 212, and the third light-emitting layer 213 emit light of different colors under the control of the first electrodes 22 and the second electrodes 23. For example, the first light-emitting layer 211 may emit blue light, the second light-emitting layer 212 may emit green light, and the third light-emitting layer 213 may emit red light. The color filter layer 25 may include filter units of different colors. For example, the color filter layer 25 may include a red filter unit, a green filter unit, and a blue filter unit. The light emitted from the first light-emitting layer 211, the second light-emitting layer 212, and the third light-emitting layer 213 can be superimposed to form white light. After the light emitted from the light-emitting layer 21 passes through the filter layer 25, the display panel 101 emits light of different colors.
[0070] In a specific configuration, to protect the lens array 102, a protective layer 103 can be provided on the side of the lens array 102 facing away from the display panel 101. The protective layer 103 covers the lens array 102, thereby providing better protection. For example, the protective layer 103 may include optical adhesive or other transparent materials.
[0071] Of course, the display panel in this embodiment can also be other types of display panels such as liquid crystal display (LCD) or active matrix organic light-emitting diode (AMOLED), and can be set according to actual needs.
[0072] In some embodiments of this application, such as Figure 3As shown, the display panels 101 in the splicing display screen 10 can be configured to have the same shape and substantially the same size. This allows for mass production of the display panels 101 and lens array 102 during manufacturing, which improves production efficiency. In other embodiments of this application, such as... Figure 7 As shown, Figure 7 This is another structural schematic diagram of the splicing display screen provided in an embodiment of this application. The splicing display screen 10 may include: a first display panel 1011 and at least two second display panels 1012. The first display panel 1011 is located at the center of the splicing display screen 10, and each of the second display panels 1012 surrounds the first display panel 1011. Since the human eye mainly focuses on the central area of the display device when viewing it, that is, the human eye is more sensitive to the central area of the display device, in this embodiment of the application, by setting a single first display panel 1011 at the center of the splicing display screen 10, the central area of the splicing display screen 10 can be seamless, and the seam is located in the peripheral area where the human eye is less sensitive. Therefore, the requirements for the seam can be reduced, thereby reducing the difficulty of handling the seam.
[0073] In practical applications, there may be certain tolerances in the manufacturing process of lens arrays, which may result in under-stitching or over-stitching of the image formed by the lens array. Figure 8 This is a schematic diagram of the lens array imaging in an embodiment of this application, wherein, Figure 8 (1) represents the case of incomplete splicing. Figure 8 (2) in the text represents the case of over-splicing. Figure 8 In this context, "Imaging 1" and "Imaging 2" represent the images corresponding to two adjacent display panels, respectively. For example... Figure 8 As shown in (1), when the image formed by the lens array is under-stitched, blank areas appear in the images corresponding to two adjacent display panels. Since the blank areas do not emit light, their brightness will be significantly lower than that of image one and image two. For example, if the brightness of image one and image two is 100 nits, then the brightness of the blank area is 0 nits, which results in a very obvious dark slit between image one and image two. Figure 8 As shown in (2), when the images formed by the lens array are spliced, an overlapping area appears between the images corresponding to two adjacent display panels. Since the brightness of the images corresponding to the two display panels is superimposed in the overlapping area, the brightness of the overlapping area will be significantly higher than that of image one and image two. For example, if the brightness of image one and image two is 100 nits respectively, the brightness of the overlapping area is 200 nits, which results in a very obvious bright seam between image one and image two.
[0074] In some embodiments of this application, the problems of under-splicing and over-splicing mentioned above can be solved by setting redundant pixels in the display panel. Figure 9This is a schematic diagram illustrating the implementation of redundant pixels in an embodiment of this application, as shown below. Figure 9 As shown, the display panel 101 may include a pixel region C, a display region A located within pixel region C, and a redundant pixel region D within pixel region C excluding the display region A. In specific settings, the size and position of the redundant pixel region D can be reasonably set according to actual needs. For example, the width of the redundant pixel region D in a single direction can be set to 10-50 pixels. Both the display region A and the redundant pixel region D are provided with pixels for display. By setting the redundant pixel region D, the display region A can be moved within pixel region C. For example... Figure 9 The display panel 101 in the middle position, taking the initial state where the display area A is located in the center of the pixel area C as an example, can control the display area A to move up, down, left, or right by controlling a part of the pixels in the pixel area C to be displayed normally and another part of the pixels not to be displayed.
[0075] Figure 10 This is a schematic diagram illustrating the movement process of the display area in an embodiment of this application, such as... Figure 10 As shown in (1), when the image formed by the lens array is under-stitched, blank areas appear in the images corresponding to two adjacent display panels 101 (image one and image two in the figure, respectively), such as Figure 10 As shown in (2), by controlling the display areas A of the two display panels 101 to move in opposite directions, the blank area of the image formed by the lens array is reduced or eliminated. Figure 11 This is a schematic diagram illustrating another movement process of the display area in an embodiment of this application, such as... Figure 11 As shown in (1), when the images formed by the lens array are spliced, the images corresponding to two adjacent display panels 101 (image one and image two in the figure, respectively) have overlapping areas, such as... Figure 11 As shown in (2), by controlling the display areas A of the two display panels 101 to move in opposite directions, the overlapping area of the image formed by the lens array is reduced or eliminated.
[0076] Figure 10 and Figure 11 Taking the control of the display area movement between two adjacent display panels as an example, this paper explains how to reduce or eliminate blank and overlapping areas. In practical implementation, when more display panels are set in a splicing display screen, the following can be followed: Figure 10 and Figure 11 The display area in the display panel can be moved in various ways, which will not be listed here.
[0077] Reference Figure 10 and Figure 11In some embodiments of this application, by setting redundant pixels in the display panel 101, the display area A in the display panel 101 can be controlled to move, and the minimum precision of the movement of the display area A is the width of one pixel. After the display area A in the display panel 101 moves, the display area A deviates from the exact center of the pixel area C. Therefore, blank areas or overlapping areas in the image can be reduced or eliminated, and the seams visible to the human eye can be further reduced or eliminated; for example, the seams can be reduced to a few micrometers.
[0078] In other embodiments of this application, for cases where the seam is small, such as a seam of a few micrometers, brightness compensation can be used to reduce or eliminate the seam. Figure 12 This is another structural schematic diagram of the splicing display screen provided in the embodiments of this application, as shown below. Figure 12 As shown, the splicing display screen 10 in this embodiment may include: a first display panel 1011 and a second display panel 1012 arranged adjacent to each other. The splicing display screen 10 may also include: a processor (not shown in the figure). In some cases, the images corresponding to the first display panel 1011 and the second display panel 1012 have an overlapping area at the splicing position. The processor may be used to control the first display panel 1011 to display at a first brightness t1 at the center position of the display area A and at a second brightness t2 at the position of the display area A corresponding to the overlapping area, wherein the first brightness t1 is greater than the second brightness t2. For example, the first brightness t1 may be approximately twice the second brightness t2. The processor may also be used to control the second display panel 1012 to display at a third brightness t3 at the center position of the display area A and at a fourth brightness t4 at the position of the display area A corresponding to the overlapping area, wherein the third brightness t3 is greater than the fourth brightness t4. For example, the third brightness t3 may be approximately twice the fourth brightness t4. In this way, by reducing the brightness of display area A at the seam position, the brightness difference between the overlapping area and other areas in the image of the lens array can be reduced, thereby alleviating or eliminating the seam. In specific implementation, when only one of the first display panel 1011 and the second display panel 1012 is lit, for example, only the first display panel 1011 is lit and the second display panel 1012 is not lit, it can be seen that in the first display panel 1011, the brightness of display area A at the seam position is significantly lower than the brightness of display area A at the center position. When both the first display panel 1011 and the second display panel 1012 are lit, the images corresponding to the first display panel 1011 and the second display panel 1012 have an overlapping area at the seam position, and the brightness of the overlapping area is basically the same as the brightness of the center position of display area A in the first display panel 1011 and the second display panel 1012.
[0079] In practice, the display brightness of pixels in display area A can be changed by altering their grayscale values. The grayscale value of pixels corresponding to the overlapping area can be determined using the following formula:
[0080]
[0081] Where G1 represents the corrected grayscale value, G0 represents the original grayscale value, k represents the gamma exponent, which is related to the corresponding parameters of the display device; for example, k can be 2.2. U represents the ratio of the corrected to the original brightness; for example, U can be 0.5. For instance, when k = 2.2 and U = 0.5, G1 = 0.73G0 is calculated. In practical implementation, the ratio of the corrected to the original brightness can be set appropriately according to actual needs.
[0082] In other embodiments of this application, for cases where the seam is small, such as a seam of a few micrometers, image content compensation can be used to reduce or eliminate the seam. Figure 13 This is another structural schematic diagram of the splicing display screen provided in the embodiments of this application, as shown below. Figure 13 As shown, the splicing display screen 10 in this embodiment may include: a first display panel 1011 and a second display panel 1012 arranged adjacent to each other. The splicing display screen 10 may also include: a processor (not shown in the figure). In some cases, the images corresponding to the first display panel 1011 and the second display panel 1012 have an overlapping area at the splicing position. The processor can be used to blur the displayed images of the first display panel 1011 and the second display panel 1012 at the splicing position. For example, upsampling algorithms or other methods can be used to blur the image. For cases where the seam is small, one row (or one column) of pixels at the seam position can be blurred. Of course, multiple rows (or multiple columns) of pixels can also be blurred, which can be set according to actual needs. In this embodiment, by blurring the displayed image at the seam position, the image difference between the seam position and other areas can be alleviated, thereby alleviating or eliminating the seam.
[0083] The above describes various ways to alleviate or eliminate seams. In practice, these methods can be combined and adjusted according to actual needs. These will not be elaborated on here.
[0084] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.
[0085] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this application without departing from the spirit and scope of the embodiments of this application. Therefore, if these modifications and variations to the embodiments of this application fall within the scope of the claims of this application and their equivalents, this application also intends to include these modifications and variations.
Claims
1. A tiled display screen, characterized by The display screen comprises: at least two display panels which are spliced together, each of the at least two display panels having a display area and a non-display area; a lens array located on the light exit side of the at least two display panels; the lens array is used to magnify the display surface of the at least two display panels and to image the light exiting the at least two display panels on the light exit side of the lens array; the image formed by the lens array covers the display area of the at least two display panels and blocks at least part of the non-display area of the at least two display panels.
2. The tiled display screen of claim 1, wherein, The magnification of the lens array is in the range of 1-2.
3. A tiled display screen as claimed in claim 1 or 2, characterized in that The radius of curvature of each lens in the lens array is in the range of 5-50 um, and the refractive index of the lens array is in the range of 1.4-2.
4. A tiled display screen as claimed in any one of claims 1 to 3, characterized in that The lens array comprises at least two lens groups. The light exit side of each display panel is provided with one lens group, and the lens group is arranged at the position of the display area of the corresponding display panel.
5. A tiled display screen as claimed in any one of claims 1 to 4, wherein, The shapes of the display panels in the spliced display screen are consistent, and the sizes of the display panels are substantially equal.
6. A tiled display screen as claimed in any one of claims 1 to 4, wherein, The at least two display panels comprise a first display panel and at least two second display panels. The first display panel is located at the center position of the spliced display screen, and the at least two second display panels surround the first display panel.
7. A tiled display screen as claimed in any one of claims 1 to 6, wherein, The at least two display panels comprise a first display panel and a second display panel which are arranged adjacently. The corresponding images of the first display panel and the second display panel have an overlapping area at the splicing position. The spliced display screen further comprises a processor. The processor is used to control the first display panel to display at a first brightness at the center position of the display area and to display at a second brightness at the position of the display area corresponding to the overlapping area; the first brightness is greater than the second brightness. The processor is further used to control the second display panel to display at a third brightness at the center position of the display area and to display at a fourth brightness at the position of the display area corresponding to the overlapping area; the third brightness is greater than the fourth brightness.
8. A tiled display screen as claimed in any one of claims 1 to 7, wherein, The at least two display panels comprise a first display panel and a second display panel which are arranged adjacently. The corresponding images of the first display panel and the second display panel have an overlapping area at the splicing position. The spliced display screen further comprises a processor. The processor is used to perform blur processing on the display pictures of the first display panel and the second display panel at the splicing position.
9. A tiled display screen as claimed in any one of claims 1 to 8, wherein, The display panel is a silicon-based OLED display panel.
10. A display device, characterized by The display screen comprises: the spliced display screen according to any one of claims 1-9 and a circuit board; the spliced display screen is electrically connected with the circuit board.