Display module and display device

Abstract

This application discloses a display module and a display device. The display module includes a first display unit, a second display unit, and a wavelength-selective color combining element. The first display unit outputs first light with a first center wavelength; the second display unit outputs second light with a second center wavelength; the wavelength-selective color combining element is disposed in the output light path of the first light and the second light, and is used to combine the first light and the second light into a single output light; wherein, the wavelength-selective color combining element includes a first reflective film, which is configured to reflect the first light and transmit the second light, or to reflect the second light and transmit the first light. This application can improve the performance of the display module.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to a display module and a display device. Background Technology

[0002] Augmented Reality (AR) devices have a wide range of applications and huge market potential. In AR device display solutions, waveguide technology, which can achieve a form factor close to conventional glasses, has gradually become the mainstream solution recognized in the industry. To match the optical path efficiency of the waveguides in AR glasses, ultra-high pixel density microdisplays with brightness reaching tens of thousands to hundreds of thousands of nits are required, and the performance of traditional display modules needs to be improved. Summary of the Invention

[0003] This application provides a display module and a display device, which aim to improve the performance of the display module.

[0004] A first aspect of this application provides a display module, which includes a first display unit, a second display unit, and a wavelength-selective color combining element. The first display unit is used to output first light having a first center wavelength. The second display unit is used to output second light having a second center wavelength. The wavelength-selective color combining element is disposed on the outgoing light path of the first light and the second light, and is used to combine the first light and the second light into a single light output. The wavelength-selective color combining element includes a first reflective film, which is configured to reflect the first light and transmit the second light, or to reflect the second light and transmit the first light.

[0005] According to an embodiment of the first aspect of this application, the absolute value of the difference between the first center wavelength and the second center wavelength is greater than or equal to 20 nm.

[0006] According to any of the foregoing embodiments of the first aspect of this application, the center wavelength of the reflection spectrum of the first reflective film is aligned with the first center wavelength, and the range of the reflection spectrum is from ±6nm to ±20nm of the first center wavelength.

[0007] According to any of the foregoing embodiments of the first aspect of this application, the range of the reflection spectrum is the first center wavelength ±10 nm.

[0008] According to any of the foregoing embodiments of the first aspect of this application, both the first center wavelength and the second center wavelength are located in the green spectral band.

[0009] According to any of the foregoing embodiments of the first aspect of this application, the first center wavelength is 520nm±15nm and the second center wavelength is 540nm±15nm.

[0010] According to any of the foregoing embodiments of the first aspect of this application, the display module has a first side surface, a second side surface and a light-emitting surface, a first display unit is disposed on the first side surface, a second display unit is disposed on the second side surface, and the first side surface and the second side surface are intersected.

[0011] According to any of the foregoing embodiments of the first aspect of this application, the light-emitting surface is arranged parallel to the first side surface or the second side surface.

[0012] According to any of the foregoing embodiments of the first aspect of this application, the first side and the second side are arranged perpendicularly to each other.

[0013] According to any of the foregoing embodiments of the first aspect of this application, the included angle between the first reflective film and the first side surface is 45°.

[0014] According to any of the foregoing embodiments of the first aspect of this application, the included angle between the first reflective film and the second side surface is 45°.

[0015] According to any of the foregoing embodiments of the first aspect of this application, the display module further includes a hollow bracket, the hollow bracket having a first mounting position corresponding to the first side and a second mounting position corresponding to the second side, the hollow bracket enclosing a receiving space, and a wavelength selective color mixing element disposed within the receiving space.

[0016] According to any of the foregoing embodiments of the first aspect of this application, the hollow bracket is formed with a first hollow window, the first hollow window being disposed on the side of the first display unit facing the first reflective film; and / or, the hollow bracket is formed with a second hollow window, the second hollow window being disposed on the side of the second display unit facing the first reflective film.

[0017] According to any of the foregoing embodiments of the first aspect of this application, the display module further includes a third display unit disposed on a third side, the third display unit being used to output third light having a third center wavelength, the absolute value of the difference between the third center wavelength and the first center wavelength and the second center wavelength being greater than or equal to 20nm; the wavelength selective color combining element further includes a second reflective film; wherein, the first reflective film is configured to reflect the first light and transmit the second light and the third light; the second reflective film is configured to reflect the second light and transmit the first light and the third light.

[0018] According to any of the foregoing embodiments of the first aspect of this application, the center wavelength of the first reflection spectrum of the first reflective film is aligned with the first center wavelength, the center wavelength of the second reflection spectrum of the second reflective film is aligned with the second center wavelength, the range of the first reflection spectrum is from ±6nm to ±12nm of the first center wavelength, and the range of the second reflection spectrum is from ±6nm to ±12nm of the second center wavelength.

[0019] According to any of the foregoing embodiments of the first aspect of this application, the range of the first reflection spectrum is the first center wavelength ±10 nm, and the range of the second reflection spectrum is the second center wavelength ±10 nm.

[0020] According to any of the foregoing embodiments of the first aspect of this application, the first side and the second side are arranged parallel to each other.

[0021] According to any of the foregoing embodiments of the first aspect of this application, the third side surface is arranged parallel to the light-emitting surface.

[0022] According to any of the foregoing embodiments of the first aspect of this application, the first side and / or the second side are arranged perpendicularly to the third side.

[0023] According to any of the foregoing embodiments of the first aspect of this application, the first reflective film and the second reflective film are arranged perpendicularly to each other.

[0024] According to any of the foregoing embodiments of the first aspect of this application, the first center wavelength, the second center wavelength, and the third center wavelength are all located in the green spectral band and are different from each other.

[0025] According to any of the foregoing embodiments of the first aspect of this application, the first center wavelength is 510nm±15nm, the second center wavelength is 530nm±15nm, and the third center wavelength is 550nm±15nm.

[0026] According to any of the foregoing embodiments of the first aspect of this application, the wavelength selective color combining element further includes a first prism located on the side of the first reflective film facing the first display unit; and / or a second prism located on the side of the first reflective film facing the second display unit.

[0027] According to any of the foregoing embodiments of the first aspect of this application, the display module further includes a hollow bracket, which encloses and forms an accommodating space, and the first prism and the second prism are both disposed within the accommodating space.

[0028] According to any of the foregoing embodiments of the first aspect of this application, the first prism and the second prism are bonded together, and the first reflective film is coated on the bonding surface of the first prism and the second prism.

[0029] According to any of the foregoing embodiments of the first aspect of this application, the wavelength-selective color combining element includes a reflective lens, and a first reflective film is disposed on the reflective lens.

[0030] According to any of the foregoing embodiments of the first aspect of this application, the first display unit and the second display unit are integrated on the same flexible display panel to form the first display area and the second display area of ​​the flexible display panel.

[0031] According to any of the foregoing embodiments of the first aspect of this application, a flexible display panel is disposed around a wavelength-selective color combining element, such that light emitted from the first display area and the second display area is incident on different incident surfaces of the wavelength-selective color combining element.

[0032] According to any of the foregoing embodiments of the first aspect of this application, the flexible display panel is controlled by a single display driver chip to achieve synchronization of the output images of the first display area and the second display area.

[0033] According to any of the foregoing embodiments of the first aspect of this application, the display module further includes a hollow bracket, and the first display area, the second display area and the display driver chip are respectively disposed on different sides of the hollow bracket.

[0034] A second aspect of this application provides a display device, which includes the display module provided in any of the embodiments of the first aspect described above.

[0035] According to the embodiment of this application, the display module includes a first display unit, a second display unit, and a wavelength-selective color combining element. The wavelength-selective color combining element spatially combines the output light from two or more display units with different emission wavelengths, achieving brightness superposition of the light output. Since the two beams of light ultimately exit along the same optical path, the superimposed brightness can theoretically reach the sum of the brightness of the two display units. This effectively improves the overall output brightness of the display module without significantly increasing the brightness of individual display units, addressing the problem of insufficient brightness in traditional display modules and enhancing the performance of the display module. Attached Figure Description

[0036] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings, in which the same or similar reference numerals denote the same or similar features, and the drawings are not drawn to scale.

[0037] Figure 1 This is a cross-sectional structural diagram of a display module provided in one embodiment of this application; Figure 2 This is a cross-sectional structural diagram of a display module provided in another embodiment of this application; Figure 3 This is a cross-sectional structural diagram of a display module provided in another embodiment of this application; Figure 4 This is a cross-sectional structural diagram of a display module provided in another embodiment of this application; Figure 5 This is a cross-sectional structural diagram of a display module provided in another embodiment of this application; Figure 6This is a schematic diagram of the structure of a flexible display panel provided in one embodiment of this application; Figure 7 This is a cross-sectional structural diagram of a display module provided in another embodiment of this application.

[0038] Explanation of reference numerals in the attached figures: 10. Flexible display panel; 101. First display area; 102. Second display area; 103. Display driver chip; 11. First display unit; 12. Second display unit; 13. Third display unit; 2. Wavelength-selective color combining element; 21. First reflective film; 22. Second reflective film; 23. First prism; 24. Second prism; 25. Reflective mirror; 31. First side surface; 32. Second side surface; 33. Third side surface; 34. Light-emitting surface; 4. Hollowed-out support; 40. Accommodation space; 41. First hollowed-out window; 42. Second hollowed-out window. Detailed Implementation

[0039] The features and exemplary embodiments of various aspects of this application will now be described in detail. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain this application and are not configured to limit this application. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples of this application.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0041] It should be understood that when describing the structure of a component, when referring to a layer or region as being "above" or "on top of" another layer or region, it can mean that it is directly above the other layer or region, or that it contains other layers or regions between it and the other layer or region. Furthermore, if the component is flipped over, that layer or region will be located "below" or "under" the other layer or region.

[0042] Augmented Reality (AR) devices have a wide range of applications and enormous market potential. In AR device display solutions, waveguide technology, which can achieve a form factor close to conventional glasses, has gradually become the mainstream solution recognized in the industry. To match the optical path efficiency of the waveguides in AR glasses, ultra-high pixel density microdisplays with brightness reaching tens of thousands to hundreds of thousands of nits are required.

[0043] Currently, the mainstream display technology in the industry that uses optical waveguides is silicon-based Micro-LED display. While this solution offers high brightness, it also suffers from high processing costs and low mass production yield. Therefore, the industry urgently needs to develop alternative solutions based on OLED (Organic Light-Emitting Diode) to significantly reduce costs and improve yield, thereby promoting the large-scale commercial application of AR terminals.

[0044] However, traditional OLED displays have relatively low screen brightness, and their output brightness often cannot meet the high brightness requirements of AR terminals that work in conjunction with waveguide optical paths. Simply increasing the luminous brightness of a single OLED pixel is limited by material lifespan and power consumption.

[0045] To address the aforementioned issues, this application provides a display module and a display device. The following description, in conjunction with the accompanying drawings, will illustrate various embodiments of the display module and the display device.

[0046] Reference Figures 1 to 4 , Figure 1 The principle of wavelength-selective color combining elements is illustrated by arrows of different colors.

[0047] A first aspect of this application provides a display module, which includes a first display unit 11, a second display unit 12, and a wavelength selective color combining element 2. The first display unit 11 is used to output first light with a first center wavelength; the second display unit 12 is used to output second light with a second center wavelength; the wavelength selective color combining element 2 is disposed on the outgoing light path of the first light and the second light, and is used to combine the first light and the second light into a single light output; wherein the wavelength selective color combining element 2 includes a first reflective film 21, which is configured to reflect the first light and transmit the second light, or to reflect the second light and transmit the first light.

[0048] Both the first display unit 11 and the second display unit 12 can be microdisplays made using OLED technology.

[0049] The wavelength-selective color combining element 2 is an optical element disposed at the intersection of the light paths emitted from two display units. Its core structure includes at least a first reflective film 21 with wavelength selectivity. This film can be made by a precision optical coating process. It can use its interference effect to achieve high reflection of the first light and high transmission of the second light (or vice versa), thereby efficiently combining two different colored lights into a single path output.

[0050] Optionally, the absolute value of the difference between the first center wavelength and the second center wavelength is greater than or equal to 20 nm. This setting provides a sufficient spectral isolation range for the narrow-band reflective film (e.g., ±10 nm bandwidth) of the wavelength-selective color combining element, ensuring that the reflection and transmission channels of the two light paths do not overlap, reducing the risk of color crosstalk. At the same time, this difference covers the spectral drift tolerance of OLED materials under mass production processes and temperature fluctuations (typically ±5~8 nm), which not only ensures the stability of color combining efficiency, but also avoids the increased manufacturing difficulty and cost caused by the need for an extremely narrow-band film layer due to excessively close wavelengths.

[0051] In the embodiments of this application, the display module includes a first display unit 11, a second display unit 12, and a wavelength-selective color combining element 2. The wavelength-selective color combining element 2 spatially combines the output light from two or more display units with different emission wavelengths, achieving brightness superposition of the light output. Since the two beams of light ultimately exit along the same optical path, the superimposed brightness can theoretically reach the sum of the brightness of the two display units. This effectively improves the overall output brightness of the display module without significantly increasing the brightness of individual display units, addressing the problem of insufficient brightness in traditional display modules and enhancing the performance of the display module. It is particularly suitable for applications with stringent brightness requirements, such as AR.

[0052] Compared to related technologies, this application abandons the traditional single-screen ultra-high brightness display solution and instead uses two or more OLED microdisplays, each operating in a specific wavelength range and with wavelength differences. It utilizes wavelength-selective color combining elements 2 to efficiently combine the light emitted by the two displays. On the one hand, by combining light energy through multiple screens, it achieves ultra-high system brightness of tens of thousands or even hundreds of thousands of nits that can match the requirements of optical waveguides without drastically increasing the brightness of individual OLED pixels, thus avoiding their lifespan decay and excessive power consumption. On the other hand, this solution is entirely based on the OLED technology route, which has lower costs and easier yield improvement, avoiding the high processing costs and mass production yield bottlenecks faced by current Micro-LEDs.

[0053] In some optional embodiments, the center wavelength of the reflection spectrum of the first reflective film 21 is aligned with a first center wavelength, and the range of the reflection spectrum is from ±6 nm to ±20 nm of the first center wavelength.

[0054] Center wavelength alignment of the reflection spectrum refers to the precise design of the film system to ensure that the wavelength position corresponding to the maximum reflectivity (i.e., reflection peak) of the first reflective film 21 is matched with the center wavelength (peak wavelength) of the first light output by the first display unit 11, thereby maximizing the reflection efficiency of the target wavelength band. The range of the reflection spectrum (i.e., the reflection bandwidth) is limited to a range of 6nm to 20nm on both sides of the first center wavelength, meaning that the reflective film has high reflectivity only for light in this specific narrow wavelength band, while exhibiting high transmittance for light outside this range.

[0055] By precisely defining the reflection spectrum range of the first reflective film 21, such as ±6nm to ±20nm, the efficient utilization of reflected light and the low loss of transmitted light are ensured, thereby maximizing the utilization of light energy and guaranteeing the brightness superposition effect.

[0056] Optionally, the range of the reflection spectrum is ±10nm of the first center wavelength. The ±10nm bandwidth strikes a good balance between optical performance and process feasibility, which can fully cover the slight spectral drift of the OLED light source under temperature fluctuations and ensure the stability of the light combining efficiency; and can also form clear spectral isolation with the second center wavelength, which is at least 20nm different, to eliminate color crosstalk.

[0057] Optionally, both the first and second center wavelengths are located within the green spectrum. By confining both display units to the green spectrum, the brightness of the green light channel is doubled without significantly increasing the driving current of a single pixel. Since the human eye is most sensitive to green light, this approach maximizes the overall display brightness of the AR glasses while avoiding the material aging and lifespan reduction issues caused by driving a single green screen with ultra-high brightness. For example, both the first and second center wavelengths are between 495nm and 570nm. The absolute value of the difference between the first and second center wavelengths is less than or equal to 75nm.

[0058] Optionally, the first center wavelength is 520nm±15nm, and the second center wavelength is 540nm±15nm. The 20nm difference in center wavelength precisely meets the narrow-band reflection requirements of the wavelength-selective color combining element 2, enabling the two green lights with a ±10nm reflection bandwidth to be efficiently combined, achieving a doubling of brightness. Secondly, both of these bands are regions with high visual sensitivity of the human eye, contributing the highest perceived brightness with the lowest power consumption. Finally, the ±15nm tolerance range fully covers the wavelength fluctuations and temperature drift of OLED materials during mass production, improving production yield without sacrificing color combining efficiency.

[0059] In some optional embodiments, the display module has a first side 31, a second side 32 and a light-emitting surface 34, a first display unit 11 is disposed on the first side 31, a second display unit 12 is disposed on the second side 32, and the first side 31 and the second side 32 are intersecting.

[0060] This three-dimensional spatial layout avoids stacking displays on the same plane, effectively compressing the module thickness and making it easier to achieve a thinner and lighter appearance for AR products. On the other hand, the intersecting sides provide a flexible optical path turning space for the wavelength selective color combining element 2, allowing two different wavelengths of light to complete color combining with a more compact folded optical path, which improves brightness while optimizing the size and weight ratio of the optical engine.

[0061] Optionally, the light-emitting surface 34 is arranged parallel to the first side surface 31 or the second side surface 32. Optionally, the first side surface 31 and the second side surface 32 are arranged perpendicular to each other. The perpendicularly intersecting sides allow the emitted light from the two display units to be incident on the color combining element in an orthogonal direction, simplifying the angle design of the reflective film and effectively avoiding the reflection spectrum shift caused by excessive incident angle. At the same time, the parallel relationship between the light-emitting surface 34 and the side surface makes the module as a whole a regular rectangular block, which not only improves the space utilization rate, but also facilitates precise optical coupling with the optical waveguide. These embodiments construct a compact and regular three-dimensional optical path structure, which is conducive to the miniaturization of the display module and enables it to be integrated into devices with limited space.

[0062] Optionally, the angle between the first reflective film 21 and the first side surface 31 is 45°. Optionally, the angle between the first reflective film 21 and the second side surface 32 is 45°. The 45° angle setting standardizes the optical design and facilitates the use of conventional optical components to achieve optical path beam combining.

[0063] Reference Figures 2 to 5 In some optional embodiments, the display module further includes a hollow bracket 4, which has a first mounting position corresponding to the first side 31 and a second mounting position corresponding to the second side 32. The hollow bracket 4 encloses and forms an accommodating space 40, and the wavelength selective color combining element 2 is disposed in the accommodating space 40.

[0064] In these embodiments, the two display units and color-combining elements are integrated into a pre-assembled optical engine module by using an integrated bracket, which greatly improves the assembly accuracy and production efficiency; the hollow structure not only reduces the weight of the module, but also provides an unobstructed transmission channel for the optical path, avoiding stray light interference; at the same time, the accommodating space provides physical protection for the 40 pairs of color-combining elements, ensuring that their precision film layers are not contaminated or damaged during assembly and use.

[0065] Optionally, the hollow bracket 4 forms a first hollow window 41, which is disposed on the side of the first display unit 11 facing the first reflective film 21; and / or, the hollow bracket 4 forms a second hollow window 42, which is disposed on the side of the second display unit 12 facing the first reflective film 21.

[0066] The perforated bracket 4 provides precise physical positioning and stable support for the display unit and color-combining components, ensuring the accuracy of the optical path and the reliability of the module. The perforated window design cleverly avoids structural components from obstructing the optical path and helps to reduce the overall weight.

[0067] Reference Figure 7 , Figure 7 The principle of the wavelength-selective color combining element 2 is illustrated by arrows of different colors. In some optional embodiments, the display module further includes a third display unit 13 disposed on the third side 33, the third display unit 13 being used to output third light with a third center wavelength, the absolute value of the difference between the third center wavelength and the first center wavelength and the second center wavelength being greater than or equal to 20 nm; the wavelength-selective color combining element 2 also includes a second reflective film 22; wherein, the first reflective film 21 is configured to reflect the first light and transmit the second light and the third light; the second reflective film 22 is configured to reflect the second light and transmit the first light and the third light.

[0068] By employing a cascaded design of three narrow-band reflective films, efficient light combining of three different wavelengths is achieved. This enables a display solution that meets the high brightness requirements of optical waveguides without drastically increasing the brightness of a single screen. Simultaneously, this multi-layer film structure maintains spectral isolation between channels, eliminating color crosstalk. The addition of a third display unit 13 and a second reflective film 22 extends the brightness superposition scheme from two to three paths, theoretically achieving three times the brightness output of a single display unit.

[0069] Optionally, the center wavelength of the first reflection spectrum of the first reflective film 21 is aligned with the first center wavelength, and the center wavelength of the second reflection spectrum of the second reflective film 22 is aligned with the second center wavelength. The range of the first reflection spectrum is ±6nm to ±12nm of the first center wavelength, and the range of the second reflection spectrum is ±6nm to ±12nm of the second center wavelength. By limiting the reflection spectrum range of each reflective film (±6nm to ±12nm), optical crosstalk between different wavelength channels is effectively suppressed, ensuring the color purity and image quality after light combining.

[0070] Optionally, the range of the first reflection spectrum is ±10nm of the first center wavelength, and the range of the second reflection spectrum is ±10nm of the second center wavelength. This design ensures that the reflection spectra of two green lights with a center wavelength difference of 20nm (such as 520nm and 540nm) are completely separated and do not overlap. Through this "staggered narrowband" design, the two green lights achieve pure superposition with zero crosstalk during the light combining process, which not only ensures the brightness doubling efficiency but also avoids color distortion caused by spectral overlap. At the same time, the ±10nm bandwidth provides sufficient tolerance for wavelength fluctuations in OLED mass production, effectively improving production yield while ensuring optical performance.

[0071] Optionally, the first side 31 and the second side 32 are arranged parallel to each other. Optionally, the third side 33 and the light-emitting surface 34 are arranged parallel to each other. Optionally, the first side 31 and / or the second side 32 and the third side 33 are arranged perpendicular to each other. Optionally, the first reflective film 21 and the second reflective film 22 are arranged perpendicular to each other. This specific geometric layout facilitates the realization of three-way light beam combining, resulting in a compact structure and simple installation.

[0072] Optionally, the first, second, and third center wavelengths are all located within the green spectrum and are distinct from each other. Limiting the emission center wavelengths of the three display units to the green spectrum and ensuring they are different facilitates a doubling of brightness while maintaining high luminous efficiency. For example, the first, second, and third center wavelengths are all located between 495nm and 570nm. The absolute value of the difference between any two of the first, second, and third center wavelengths is less than or equal to 75nm.

[0073] Optionally, the first center wavelength is 510nm±15nm, the second center wavelength is 530nm±15nm, and the third center wavelength is 550nm±15nm. The specific selection of 510nm, 530nm, and 550nm covers a wide range of visible and green light while maintaining sufficient wavelength spacing, providing a good design margin for the fabrication of the reflective film and spectral separation.

[0074] Reference Figure 2 and Figure 3 In some optional embodiments, the wavelength selective color combining element 2 further includes a first prism 23 located on the side of the first reflective film 21 facing the first display unit 11; and / or a second prism 24 located on the side of the first reflective film 21 facing the second display unit 12.

[0075] The prism can be made of high-transmittance optical glass or resin material, and its cross-sectional shape can be triangular or trapezoidal. It is tightly bonded to the reflective film layer by gluing or optical contact.

[0076] In these embodiments, the introduction of prisms can effectively adjust the incident light angle, so that the first light and the first beam can irradiate the surface of the reflective film at a more ideal incident angle, thereby improving the reflection / transmission efficiency and spectral selectivity. At the same time, the prism structure can provide physical support and protection for the reflective film, prevent the film layer from being damaged, simplify the optical path alignment process, improve the module assembly accuracy and reliability, and the prism can also provide a flat substrate for the reflective film, ensuring the surface accuracy of the optical surface.

[0077] Optionally, the display module also includes a hollow bracket 4, which encloses a receiving space 40, within which the first prism 23 and the second prism 24 are both disposed. The hollow bracket 4 simplifies the assembly process by ensuring the alignment accuracy of the two prisms with the light-emitting surfaces 34 of the corresponding display units, as well as the relative positional stability of the prisms with the internal color-combining film layer; the receiving space 40 provides physical protection for the prisms, preventing them from being contaminated or scratched during handling and use.

[0078] Optionally, the first prism 23 and the second prism 24 are bonded together, and the first reflective film 21 is coated on the bonding surfaces of the first prism 23 and the second prism 24. Coating the reflective film on the bonding surfaces of the two prisms to form a bonded prism assembly not only protects the vulnerable film layer, but also simplifies the alignment adjustment during the assembly process, and improves production efficiency, product consistency, and long-term stability.

[0079] Reference Figure 4 and Figure 5 In some optional embodiments, the wavelength-selective color combining element 2 includes a reflective mirror 25, on which a first reflective film 21 is disposed. The reflective mirror 25 can replace the prism, and using the reflective mirror 25 as the color combining element results in a simpler structure and lower cost.

[0080] The reflective lens 25 can be made of high-transmittance optical glass or resin material, and a first reflective film 21 is set on the surface through a precision coating process to form an integrated reflective element.

[0081] Reference Figure 5 and Figure 6 In some optional embodiments, the first display unit 11 and the second display unit 12 are integrated on the same flexible display panel 10 to form the first display area 101 and the second display area 102 of the flexible display panel 10. The flexibility allows the display panel to be bent and shaped, making it easy to adapt to the intersecting layout of the first side 31 and the second side 32, achieving a compact optical path without additional mechanical structures; at the same time, it greatly simplifies the driving circuit and assembly process.

[0082] The flexible display panel 10 can use flexible materials such as polyimide as a substrate and simultaneously prepare two light-emitting areas through a one-time film-forming process.

[0083] Optionally, the flexible display panel 10 is arranged around the wavelength selective color combining element 2 so that light emitted from the first display area 101 and the second display area 102 is incident on different incident surfaces of the wavelength selective color combining element 2.

[0084] Optionally, the flexible display panel 10 is controlled by a single display driver chip 103 to synchronize the output images of the first display area 101 and the second display area 102. Alternatively, in other embodiments, the first display unit 11 and the second display unit 12 may also be driven by two independent display chips.

[0085] Optionally, the display module also includes a hollow bracket 4, with the first display area 101, the second display area 102 and the display driver chip 103 respectively disposed on different sides of the hollow bracket 4.

[0086] Integrating two display units onto a single flexible display panel 10 and controlling them with a single driver chip reduces costs by saving a display driver chip 103 and related circuitry. Secondly, it simplifies the system, as a single driver chip easily ensures high synchronization of the images in the two display areas, eliminating the need for complex synchronization algorithms. Thirdly, it saves space: the display driver chip 103 can be flexibly placed on other sides of the bracket, optimizing the spatial layout and enabling a more compact module design. The flexible screen's "enclosed" design makes the optical path structure of the entire module more seamless.

[0087] A second aspect of this application provides a display device, which includes the display module provided in any of the embodiments of the first aspect described above. The display device may be a mobile phone, tablet computer, laptop computer, drone, augmented reality / virtual reality device, etc. Since the display device provided in the second aspect of this application includes the display module provided in any of the embodiments of the first aspect described above, the display device provided in the second aspect of this application has the beneficial effects of the display module of any of the embodiments of the first aspect described above, which will not be elaborated further here.

[0088] The following description is based on specific embodiments.

[0089] Example 1 like Figure 1 As shown, the display module of this embodiment includes: a first display unit 11, a second display unit 12, and a wavelength selective color combining element 2 composed of a first prism 23, a second prism 24 and a first reflective film 21 coated on their bonding surface.

[0090] The center wavelength of the emission spectrum of the first display unit 11 is n1, and the center wavelength of the emission spectrum of the second display unit 12 is n2, and |n1-n2| ≥ 20nm. The first reflective film 21 is a thin film coated on the first prism 23 or the second prism 24, and the center wavelength of its reflective spectrum is aligned with n1, with a reflective wavelength range of n1±6-20nm.

[0091] During operation, the first light emitted from the first display unit 11 is incident on the first prism 23. The n1 band light contained in the light is reflected by the first reflective film 21, changing its optical path and propagating towards the light-emitting surface 34. The second light emitted from the second display unit 12 is incident on the second prism 24. Since its center wavelength is n2, which is offset from the reflection center wavelength n1 of the first reflective film 21, most of the second light passes through the first reflective film 21 and continues to propagate in the original direction. Finally, the reflected first light and the transmitted second light exit along the same optical path (the direction of the light-emitting surface 34), achieving complete overlap and brightness superposition of the two images.

[0092] For example, if the light emission center wavelength of the first display unit 11 is set to 520nm, the light emission center wavelength of the second display unit 12 is set to 540nm, and the reflection spectrum range of the first reflective film 21 is 520±10nm, then the device can achieve the superposition of the brightness of the first display unit 11 and the second display unit 12, thereby nearly doubling the overall output brightness of the OLED display module.

[0093] Example 2 Based on Example 1, such as Figure 2 As shown, this embodiment adds a perforated bracket 4 for installation and fixation. The perforated bracket 4 has a first mounting position corresponding to the first side 31 and a second mounting position corresponding to the second side 32, for precisely fixing the first display unit 11 and the second display unit 12. The perforated bracket 4 encloses and forms a receiving space 40, fixing the first prism 23 and the second prism 24 within it. Furthermore, the bracket also has a first perforated window 41 and a second perforated window 42, respectively located on the side of the first display unit 11 and the second display unit 12 facing the color-combining element, to ensure that the light path is not blocked.

[0094] Example 3 This embodiment is a structural variant of the wavelength-selective color combining element 2. For example... Figure 3 As shown, the first prism 23 is removed, leaving only the second prism 24, and the first reflective film 21 is directly coated onto one side of the second prism 24. Alternatively, as... Figure 4As shown, the prism is completely eliminated, and a single reflective lens 25 is used. The first reflective film 21 is placed on the reflective lens 25. The placement angle of the first display unit 11 and the second display unit 12 can be adjusted so that the light emitted by them is incident on the reflective lens 25 at appropriate angles. This achieves the same effect of one beam of light being reflected and the other beam being transmitted. This structure is simpler and less expensive.

[0095] Example 4 This embodiment is an extension of the display unit's structure. For example... Figure 5 and Figure 6 As shown, the two independent display units from Embodiment 1 are integrated onto a flexible display panel 10. The flexible display panel 10 is bent to form two display areas: a first display area 101 and a second display area 102. The flexible panel surrounds a color-combining element composed of a prism and a reflective film, allowing light emitted from the two display areas to be incident on different incident surfaces of the color-combining element. Both display areas are controlled by the same display driver chip 103.

[0096] Only one driver chip is needed, which effectively reduces material costs; a single driver chip controls two display areas, making it easy to achieve high image synchronization and simplifying system configuration and synchronization algorithms; the display driver chip 103 can be flexibly arranged on the other side of the hollow bracket 4, which helps to further save space and achieve module miniaturization.

[0097] Example 5 This embodiment represents an even greater pursuit of brightness, employing a three-screen structure. For example... Figure 7 As shown, the display module includes a first display unit 11, a second display unit 12, and a third display unit 13. Their emission spectrum center wavelengths are n1, n2, and n3, respectively, and the absolute value of the difference between any two is ≥20nm. The color combining element includes a first reflective film 21 and a second reflective film 22 arranged perpendicularly to each other.

[0098] For example, the light emission center wavelengths of the first display unit 11, the second display unit 12, and the third display unit 13 are set to 510nm, 530nm, and 550nm, respectively. The first reflective film 21 has a reflection spectrum range of 510±10nm and is configured to reflect the light from the first display unit 11 and transmit the light from the second display unit 12 and the third display unit 13. The second reflective film 22 has a reflection spectrum range of 530±10nm and is configured to reflect the light from the second display unit 12 and transmit the light from the first display unit 11 and the third display unit 13. The 550nm light emitted by the third display unit 13 can pass through the first reflective film 21 and the second reflective film 22 and be emitted directly. Finally, the three beams of light are combined into one output, achieving a three-fold brightness superposition.

[0099] The embodiments described above are not exhaustive, nor do they limit the invention to the specific embodiments described. Clearly, many modifications and variations can be made based on the above description. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of this application, thereby enabling those skilled in the art to effectively utilize this application and its modifications. This application is limited only by the claims and their full scope and equivalents.

Claims

1. A display module, characterized in that, include: The first display unit is used to output first light having a first center wavelength; The second display unit is used to output a second light with a second center wavelength; A wavelength-selective color combining element is disposed in the output light path of the first light and the second light to combine the first light and the second light into a single output light; The wavelength-selective color combining element includes a first reflective film, which is configured to reflect the first light and transmit the second light, or to reflect the second light and transmit the first light.

2. The display module according to claim 1, characterized in that, The absolute value of the difference between the first center wavelength and the second center wavelength is greater than or equal to 20 nm; Preferably, the center wavelength of the reflection spectrum of the first reflective film is aligned with the first center wavelength, and the range of the reflection spectrum is from ±6nm to ±20nm of the first center wavelength; Preferably, the range of the reflection spectrum is the first center wavelength ±10 nm; Preferably, both the first center wavelength and the second center wavelength are located within the green spectral band; Preferably, the first center wavelength is 520nm±15nm and the second center wavelength is 540nm±15nm.

3. The display module according to claim 1, characterized in that, The display module has a first side, a second side, and a light-emitting surface. The first display unit is disposed on the first side, and the second display unit is disposed on the second side. The first side and the second side are intersecting. Preferably, the light-emitting surface is arranged parallel to the first side surface or the second side surface; Preferably, the first side and the second side are arranged perpendicular to each other; Preferably, the angle between the first reflective film and the first side surface is 45°; Preferably, the angle between the first reflective film and the second side surface is 45°.

4. The display module according to claim 3, characterized in that, The display module further includes a hollow bracket, which has a first mounting position corresponding to the first side and a second mounting position corresponding to the second side. The hollow bracket encloses and forms an accommodating space, and the wavelength selective color combining element is disposed within the accommodating space. Preferably, the hollow bracket has a first hollow window, which is located on the side of the first display unit facing the first reflective film; And / or, The hollow bracket has a second hollow window, which is located on the side of the second display unit facing the first reflective film.

5. The display module according to claim 3, characterized in that, The display module further includes a third display unit disposed on the third side. The third display unit is used to output third light with a third center wavelength. The absolute value of the difference between the third center wavelength and the first center wavelength and the second center wavelength is greater than or equal to 20nm. The wavelength-selective color combining element also includes a second reflective film; Wherein, the first reflective film is configured to reflect the first light and transmit the second light and the third light; the second reflective film is configured to reflect the second light and transmit the first light and the third light. Preferably, the center wavelength of the first reflection spectrum of the first reflective film is aligned with the first center wavelength, the center wavelength of the second reflection spectrum of the second reflective film is aligned with the second center wavelength, the range of the first reflection spectrum is ±6nm to ±12nm of the first center wavelength, and the range of the second reflection spectrum is ±6nm to ±12nm of the second center wavelength; Preferably, the range of the first reflection spectrum is the first center wavelength ±10 nm, and the range of the second reflection spectrum is the second center wavelength ±10 nm; Preferably, the first side and the second side are arranged parallel to each other; Preferably, the third side surface is arranged parallel to the light-emitting surface; Preferably, the first side and / or the second side are arranged perpendicular to the third side; Preferably, the first reflective film and the second reflective film are arranged perpendicular to each other.

6. The display module according to claim 5, characterized in that, The first center wavelength, the second center wavelength, and the third center wavelength are all located in the green spectral band and are different from each other; Preferably, the first center wavelength is 510nm±15nm, the second center wavelength is 530nm±15nm, and the third center wavelength is 550nm±15nm.

7. The display module according to claim 1, characterized in that, The wavelength-selective color combining element further includes: A first prism, located on the side of the first reflective film facing the first display unit; and / or, The second prism is located on the side of the first reflective film facing the second display unit; Preferably, the display module further includes a hollowed-out bracket, which encloses a receiving space, and the first prism and the second prism are both disposed within the receiving space; Preferably, the first prism and the second prism are bonded together, and the first reflective film is coated on the bonding surface of the first prism and the second prism.

8. The display module according to claim 1, characterized in that, The wavelength-selective color-combining element includes a reflective lens, and the first reflective film is disposed on the reflective lens.

9. The display module according to claim 1, characterized in that, The first display unit and the second display unit are integrated on the same flexible display panel to form the first display area and the second display area of ​​the flexible display panel; Preferably, the flexible display panel is arranged around the wavelength selective color combining element so that light emitted from the first display area and the second display area is incident on different incident surfaces of the wavelength selective color combining element, respectively. Preferably, the flexible display panel is controlled by a single display driver chip to achieve synchronization of the output images of the first display area and the second display area; Preferably, the display module further includes a hollow bracket, with the first display area, the second display area, and the display driver chip respectively disposed on different sides of the hollow bracket.

10. A display device, characterized in that, The display module includes any one of claims 1 to 9.

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