Interference filters, optical components and display modules

Abstract

This invention discloses an interference filter, optical components, and a display module, applicable to low blue light three-primary-color display devices or red, green, cyan, and blue-violet four-primary-color display devices. The interference filter is a notch filter with a filtering wavelength range of 478nm to 515nm. The interference filter includes a substrate and multiple layers, including a first refractive index layer and a second refractive index layer. The refractive index of the second refractive index layer is higher than that of the first refractive index layer. A first refractive index layer is disposed on one surface of the substrate, a second refractive index layer is disposed on the opposite side of the first refractive index layer that is in contact with the substrate, and another first refractive index layer is disposed on the surface of the second refractive index layer that is away from the first refractive index layer. The interference filter of this invention can improve the wavelength selectivity of low blue light devices and multi-primary-color devices, and achieves characteristics that are insensitive to the filtering angle of light.

Description

Technical Field

[0001] This invention relates to the field of optical device technology, and in particular to an interference filter, an optical component, and a display module. Background Technology

[0002] It is generally believed that the visible light spectrum perceptible to the human eye ranges from 380nm to 780nm. Furthermore, most of the time, the human eye observes the colors of natural objects with relatively low color saturation and a not particularly wide color gamut. The basic design goal of color displays is to reproduce the colors of various light sources and the surface colors of objects in nature as accurately as possible.

[0003] Currently, because color filters are made by mixing pigments or dyes with photoresist, it is impossible to obtain filters with strong wavelength selectivity. In multi-color displays and low blue light display devices, a shift in the peak wavelength of blue light also occurs, that is, a shift from the peak wavelength of about 450nm in ordinary blue LEDs to a peak wavelength of 458nm~465nm or 460nm~468nm. The long tail energy on the right side (long wavelength cyan, 475nm~515nm) is relatively large. This not only causes a shift in the color coordinates of the blue primary color of the display, but also a shift in the color coordinates of the green color of the display, affecting the display effect.

[0004] While some thin-film filters are used to filter specific wavelengths at the light source, current display technology and traditional video signal standards limit most displays to RGB three-primary-color displays, with a smaller portion using RGBW multi-primary-color displays. These filters primarily target white light sources with RGB three-primary-color, and rarely are designs made for the brightness and color of other multi-primary-color and low-blue-light display devices. Furthermore, the characteristics of filters are based on the angle of incidence, and they can change significantly depending on the angle of incidence. For example, the resonant wavelength may blue-shift, the filter channel may widen, transmittance may decrease, and the filtered waveform may undergo significant distortion, all of which are detrimental to display quality. Summary of the Invention

[0005] The main objective of this invention is to provide an interference filter that is highly wavelength-selective and angle-insensitive for low-blue-light and multi-primary-color devices.

[0006] To achieve the above objectives, the interference filter proposed in this invention is applied to low blue light three-primary-color display devices or red, green, cyan, blue and violet four-primary-color display devices. The interference filter is a notch interference filter, and the filtering wavelength range of the notch interference filter is 478nm to 515nm.

[0007] The interference filter includes a substrate and multiple layers of films. The films include a first refractive index film and a second refractive index film. The refractive index of the second refractive index film is higher than that of the first refractive index film. One of the first refractive index films is disposed on a surface of the substrate. One of the second refractive index films is disposed on the opposite side of the first refractive index film that is in contact with the substrate. Another of the first refractive index films is disposed on the surface of the second refractive index film that is away from the first refractive index film.

[0008] In an optional embodiment, the material of the first refractive index film is silicon dioxide or magnesium fluoride;

[0009] And / or, the material of the second refractive index film is titanium dioxide or titanium pentoxide;

[0010] And / or, the substrate is made of glass or resin.

[0011] In an optional embodiment, the total number of film layers is greater than 10 layers and less than 60 layers.

[0012] In an optional embodiment, the total number of film layers ranges from more than 15 layers to less than 25 layers.

[0013] In an optional embodiment, the total thickness of the multiple layers of the film is less than or equal to 6000 nm;

[0014] And / or, the thickness of each of the first or second refractive index film layers is greater than or equal to 10 nm and less than or equal to 1000 nm.

[0015] In an optional embodiment, the interference filter is square, rectangular, or hexagonal in shape.

[0016] In an optional embodiment, the film layer faces the incident light side; when the incident angle of the light is 0° or 45°, the transmittance of the notch filter is less than or equal to 45% at wavelengths of 500nm to 510nm, and greater than or equal to 80% at wavelengths of 532nm to 700nm and 420nm to 480nm.

[0017] Alternatively, with the film layer facing away from the incident light side, when the incident angle of the light is 0° or 28°, the transmittance of the notch filter is set to be less than or equal to 45% in the wavelength range of 500nm to 510nm, and greater than or equal to 80% in the wavelength ranges of 532nm to 700nm and 420nm to 480nm.

[0018] The present invention also proposes an interference filter for use in LED display devices, wherein the backlight module of the LED display device is provided with an optical film containing phosphor, and the interference filter is a short-wavelength pass interference filter, wherein the wavelength range allowed to pass through the short-wavelength pass interference filter is less than 478nm;

[0019] The interference filter includes a substrate and multiple layers of films. The films include a first refractive index film and a second refractive index film. The refractive index of the second refractive index film is higher than that of the first refractive index film. One of the first refractive index films is disposed on a surface of the substrate. One of the second refractive index films is disposed on the opposite side of the first refractive index film that is in contact with the substrate. Another of the first refractive index films is disposed on the surface of the second refractive index film that is away from the first refractive index film.

[0020] In an optional embodiment, the total number of film layers is greater than 10 layers and less than 40 layers.

[0021] In an optional embodiment, the total thickness of the multiple layers of the film is less than or equal to 4200 nm;

[0022] And / or, the thickness of each of the first or second refractive index film layers is greater than or equal to 10 nm and less than or equal to 1000 nm.

[0023] In an optional embodiment, the film layer faces the light-incident side; when the incident angle of the light is 0°, the transmittance of the short-wavelength pass interference filter for the wavelength range of 515nm to 700nm is less than or equal to 25%, and the transmittance for the wavelength range of 420nm to 480nm is greater than or equal to 80%; when the incident angle of the light is 45°, the transmittance of the short-wavelength pass interference filter for the wavelength range of 490nm to 700nm is less than or equal to 45%, and the transmittance for the wavelength range of 420nm to 462nm is greater than or equal to 80%.

[0024] Alternatively, with the film layer facing away from the incident light side, when the incident angle of the light is 0°, the transmittance of the short-wavelength pass interference filter for the wavelength range of 515nm to 700nm is less than or equal to 25%, and the transmittance for the wavelength range of 420nm to 480nm is greater than or equal to 80%; when the incident angle of the light is 28°, the transmittance of the short-wavelength pass interference filter for the wavelength range of 490nm to 700nm is less than or equal to 45%, and the transmittance for the wavelength range of 420nm to 462nm is greater than or equal to 80%.

[0025] The present invention also proposes an optical component, the optical component comprising an interference filter, wherein the interference filter is any of the interference filters described above;

[0026] A prism focusing film is provided in the front optical path of the interference filter;

[0027] And / or, an optical diffusion film is provided in the rear optical path of the interference filter.

[0028] The present invention also proposes a display module, including a backlight module, the backlight module including a back plate, a light source and an interference filter as described above, the light source being disposed on the back plate and the interference filter being disposed on the light-emitting side of the light source.

[0029] The interference filter of the present invention includes a substrate and a multilayer film layer disposed on one surface of the substrate. The interference filter is a notch interference filter, which can filter out wavelengths in the range of 478nm to 515nm, thereby improving the separation of green and cyan, and thus effectively improving the display effect of the applied low blue light display device or red, green, cyan, and blue-violet four-primary-color display device.

[0030] Meanwhile, multiple layers are sequentially stacked, consisting of layers with lower and higher refractive indices. Specifically, a first refractive index layer is placed on the surface of the substrate, a second refractive index layer is placed on the surface of the first refractive index layer facing away from the substrate, and another first refractive index layer is placed on the surface of the second refractive index layer facing away from the first refractive index layer, and so on. By using alternating stacking of layers with high and low refractive indices, a reasonable match is achieved between the physical thickness, transmittance, and number of layers. This results in brightness and chromaticity close to the normal viewing angle at a wide viewing angle, making the interference filter an angle-insensitive filter. It also has a good filtering effect at an off-axis polar angle of 50 degrees, enabling the applied display device to have good brightness and chromaticity display. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of an embodiment of the interference filter of the present invention;

[0033] Figure 2 This is a schematic diagram of the structure of the interference filter after splicing according to the present invention;

[0034] Figure 3 This is a transmission spectrum curve presented in Embodiment 1 of the interference filter of the present invention;

[0035] Figure 4 This is a three-dimensional spectrum corresponding to wavelength and incident angle presented in Embodiment 1 of the interference filter of the present invention;

[0036] Figure 5 The wavelength-transmittance corresponding three-dimensional spectrum is presented in Embodiment 1 of the interference filter of the present invention.

[0037] Figure 6 This is a transmission spectrum curve of the interference filter in Embodiment 2 of the present invention;

[0038] Figure 7 This is a three-dimensional spectrum corresponding to the wavelength and incident angle presented in Embodiment 2 of the interference filter of the present invention;

[0039] Figure 8 This is a three-dimensional spectrum of wavelength-transmittance corresponding to the interference filter embodiment 2 of the present invention;

[0040] Figure 9 This is the transmission spectrum curve shown in Embodiment 3 of the interference filter of the present invention;

[0041] Figure 10 This is a three-dimensional spectrum corresponding to the wavelength and incident angle presented in Embodiment 3 of the interference filter of the present invention;

[0042] Figure 11 This is a three-dimensional spectrum of wavelength-transmittance presented in Embodiment 3 of the interference filter of the present invention;

[0043] Figure 12 This is the transmission spectrum curve shown in Embodiment 4 of the interference filter of the present invention;

[0044] Figure 13 This is a three-dimensional spectrum corresponding to the wavelength and incident angle presented in Embodiment 4 of the interference filter of the present invention;

[0045] Figure 14 This is a three-dimensional spectrum of wavelength-transmittance presented in Embodiment 4 of the interference filter of the present invention;

[0046] Figure 15 This is the transmission spectrum curve shown in Embodiment 5 of the interference filter of the present invention;

[0047] Figure 16 This is a three-dimensional spectrum corresponding to the wavelength and incident angle presented in Embodiment 5 of the interference filter of the present invention;

[0048] Figure 17 This is a three-dimensional spectrum of wavelength-transmittance corresponding to the interference filter embodiment five of the present invention;

[0049] Figure 18This is the transmission spectrum curve shown in Embodiment Six of the interference filter of the present invention;

[0050] Figure 19 This is a three-dimensional spectrum corresponding to the wavelength and incident angle presented in Embodiment Six of the Interference Filter of the present invention;

[0051] Figure 20 This is a three-dimensional spectrum of wavelength-transmittance corresponding to the interference filter of the present invention, as presented in Embodiment Six.

[0052] Explanation of icon numbers:

[0053] 10 Substrate 33 Second refractive index film layer 30 membrane

[0054] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0055] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0056] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0057] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0058] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0059] This application improves display performance by designing a suitable thin-film optical interference filter to remove unnecessary spectral components from the visible light spectrum of a display device that negatively impact its functionality, particularly cyan. This interference filter, as a performance enhancement component for color displays, is widely applicable to color display modules in mobile phones, tablets, laptops, desktop computers, and home television receivers.

[0060] Please refer to Figure 1 In this embodiment of the invention, the interference filter is applied to a low blue light three-primary-color display device or a red, green, cyan, and blue-violet four-primary-color display device. The interference filter 100 is a notch interference filter, and the filtering wavelength range of the notch interference filter is 478nm to 515nm.

[0061] The interference filter 100 includes a substrate 10 and a multilayer film 30. The film 30 includes a first refractive index film 31 and a second refractive index film 33. The refractive index of the second refractive index film 33 is higher than that of the first refractive index film 31. One of the first refractive index films 31 is disposed on one surface of the substrate 10. One of the second refractive index films 33 is disposed on the opposite side of the first refractive index film 31 that is in contact with the substrate 10. Another of the first refractive index films 31 is disposed on the surface of the second refractive index film 33 that is away from the first refractive index film 31.

[0062] In this embodiment, the substrate 10 can be a component existing alone as a coating, for example, the substrate 10 can be made of thin glass or optical thin film resin, etc.; or it can be an integral structure with other optical functional film layers 30, for example, the substrate 10 can be the same component as the diffusion film, or the same component as the quantum dot color conversion material. Here, the film layer 30 can be deposited on the substrate 10 by any of the processes such as vacuum evaporation, sputtering coating, and vacuum ion plating, which has good bonding stability.

[0063] Specifically, the film layer 30 includes a first refractive index film layer 31 and a second refractive index film layer 33. The first refractive index film layer 31 refers to the film layer 30 with a lower refractive index, and the second refractive index film layer 33 refers to the film layer 30 with a higher refractive index. The refractive index range of the first refractive index film layer 31 can be less than 1.5. For example, the film material for preparing the first refractive index film layer 31 can be silicon dioxide (SiO2) with a refractive index of 1.46, or magnesium fluoride (MgF2). The refractive index range of the second refractive index film layer 33 is greater than 1.9. For example, the film material for preparing the second refractive index film layer 33 can be one of titanium dioxide (TiO2), titanium pentoxide (Ti3O5), or tantalum pentoxide (Ta2O5), where titanium dioxide has a refractive index of 2.32. Reasonable selection of the above combinations can reduce the absorption and loss of incident light by the film layer 30, and at the same time reduce the internal stress of the coating, resulting in higher process and yield. Understandably, since the interference filter 100 is used for optoelectronic displays, information displays, semiconductor displays and color displays, cost and manufacturing process of large-size filters will be the primary concerns. Therefore, in this application, as an embodiment, the material of the first refractive index film layer 31 is silicon dioxide and the material of the second refractive index film layer 33 is titanium dioxide, which are relatively inexpensive and economically feasible.

[0064] When the substrate 10 is placed on a horizontal surface, the first refractive index film layer 31 and the second refractive index film layer 33 are sequentially stacked on the upper surface of the substrate 10. For example, a first refractive index film layer 31 is laid on the surface of the substrate 10, then a second refractive index film layer 33 is laid on the surface of the first refractive index film layer 31, then a first refractive index film layer 31 is laid on the surface of the second refractive index film layer 33, and so on, with the required number of film layers 30 set as needed. Therefore, in the thickness direction of the substrate 10, the film layer 30 farthest from the substrate 10 is the uppermost film layer 30, which is the outer film layer 30, and the film layer 30 between the outer film layer 30 and the substrate 10 is the inner film layer 30. Here, the outer film layer 30 can be either the first refractive index film layer 31 or the second refractive index film layer 33, and the inner film layer 30 adjacent to the substrate 10 can be either the first refractive index film layer 31 or the second refractive index film layer 33.

[0065] In other words, the first refractive index film layer 31 and the second refractive index film layer 33 can be configured as a combined layer, and multiple such combined layers can be stacked sequentially on the substrate 10, with the first refractive index film layer 31 and the second refractive index film layer 33 being opposite each other between two adjacent combined layers.

[0066] Here, the interference filter 100 is mainly used in low blue light three-primary-color display devices and red, green, cyan, and blue-violet four-primary-color display devices. In these devices, the peak wavelength of blue light will shift, resulting in more energy in the long tail of cyan near its right side. Therefore, the interference filter 100 is set as a notch filter and is formed by stacking multiple layers of film 30. When light passes through the interference filter 100, it will undergo multiple refractions and reflections through the film 30, causing wavelengths in the range of 478nm to 515nm to be reflected and not passed through, while allowing light in other wavelength ranges to pass through. When the light passes through the color filter substrate of the display device, it can obtain purer primary colors, improve color saturation, and effectively ensure the display effect.

[0067] The interference filter 100 of the present invention includes a substrate 10 and a multilayer film layer 30 disposed on one surface of the substrate 10. The interference filter 100 is a notch interference filter 100, which can filter out wavelengths in the range of 478nm to 515nm. To a certain extent, it overcomes the defects of the light-emitting materials (such as LEDs and phosphors) and colorants (such as pigments and dyes) used in current color displays. It optimizes the separation degree and color purity of green primary color and blue primary color, thereby improving the separation degree of green and cyan blue, and thus effectively improving the display effect of the applied low blue light display device or red, green, cyan blue and blue violet four primary color display device.

[0068] Meanwhile, multiple film layers 30 are sequentially stacked, consisting of film layers with low refractive index and film layers with high refractive index. That is, a first refractive index film layer 31 is disposed on the surface of the substrate 10, a second refractive index film layer 33 is disposed on the surface of the first refractive index film layer 31 facing away from the substrate 10, another first refractive index film layer 31 is disposed on the surface of the second refractive index film layer 33 facing away from the first refractive index film layer 31, and so on. By using a combination of film layers 30 with high and low refractive indices, a reasonable match is achieved in the physical thickness, transmittance, and number of film layers 30. This results in brightness and chromaticity close to the normal viewing angle at a large viewing angle, making the interference filter 100 an angle-insensitive filter. It also has a good filtering effect at an off-axis polar angle of 50 degrees, enabling the applied display device to have good brightness and chromaticity display.

[0069] Here, the interference filter 100 of the present invention is obtained by inputting the design requirements into appropriate computer software, and the parameters are obtained by computer optimization calculation and iteration. Then, through manual screening, these designs usually do not contain specific regular cyclic units, that is, the thickness value of each film layer 30 has no obvious regularity, which makes the design cost high. Correspondingly, silicon dioxide and titanium dioxide with lower prices are selected, thus having a certain economic feasibility.

[0070] In an optional embodiment, the total number of film layers 30 is greater than 10 layers and less than 60 layers.

[0071] In this embodiment, the number of film layers 30 on the substrate 10 should not be too small, otherwise the notching effect will not be good. Of course, based on cost, the number of film layers 30 should not be too large. The total number of film layers 30 is set to 10 to 60 layers, for example, 10 layers, 15 layers, 20 layers, 25 layers, 30 layers, 35 layers, 40 layers, 45 layers, 50 layers, 55 layers, etc., so that while obtaining a good notching effect, material costs can also be effectively saved.

[0072] In an optional embodiment, the total number of film layers 30 is greater than 15 layers and less than 25 layers.

[0073] Here, in order to further save costs, the total number of layers of film 30 can be 15 to 25, such as 16, 18, 20, 22, 24, etc., to ensure that while filtering light of a specific wavelength, costs are not increased too much, and the overall thickness of the interference filter 100 is effectively controlled so as not to occupy too much space in the applied product.

[0074] In an optional embodiment, the total thickness of the multiple layers of film 30 is less than or equal to 6000 nm;

[0075] And / or, the thickness of each of the first refractive index film layer 31 or the second refractive index film layer 33 is greater than or equal to 10 nm and less than or equal to 1000 nm.

[0076] In this embodiment, the thickness of each film layer 30 should not be too small, otherwise the required refractive index will not be achieved. Of course, the thickness of the film layer 30 should not be too large either, otherwise the material cost will increase. Here, the thickness range of the film layer 30 is set to 10nm to 1000nm, for example, 10nm, 50nm, 100nm, 150nm, 200nm, 300nm, 400nm, 500nm, 600nm, etc., which can save costs while achieving the required refractive index.

[0077] As the number of film layers 30 increases, the total thickness of the multilayer film layers 30 also increases. Here, the total thickness is set to be less than or equal to 6000 nm, for example, 1000 nm, 2000 nm, 3000 nm, 4000 nm, 5000 nm, and 6000 nm, etc., which can be set according to the number of layers and the thickness of each layer as needed. Of course, the thicknesses of the multilayer film layers 30 can all be different, or some can be different.

[0078] Please combine Figure 1 and Figure 2 In an optional embodiment, the interference filter 100 is square, rectangular or regular hexagonal in shape.

[0079] Because of the vacuum evaporation process of the interference filter 100, in order to obtain the most uniform film thickness, the substrate 10 and the finished product are generally circular and rotated during the coating process, and their diameter is generally less than 50mm. Therefore, to adapt to display devices of various sizes, the shape of the interference filter 100 is set to square, rectangular, or regular hexagonal. In small display devices, a single interference filter 100 can meet the requirements; when a larger filter is needed, multiple interference filters 100 can be spliced ​​together to form a larger structure, meeting the design size of large-size optoelectronic displays or information displays. At the same time, the display area of ​​current display devices is generally rectangular. Therefore, when using the interference filter 100, the square shape eliminates the need for special edge treatment, reducing assembly steps.

[0080] Here, the circular interference filter 100 can be cut into small square or regular hexagonal pieces of appropriate size. For example, when it is square, its diagonal length can be set between 30mm and 40mm. After cutting, the substrate 10 can be thinned as needed. The regular hexagonal interference filter 100 consumes less wasted area during cutting. Of course, the shape of the interference filter 100 can also be other regular polygons, such as regular octagons, regular decagons, etc.

[0081] In applications, for edge-lit backlights in LCD devices, only a few interference filters 100 need to be installed on the light-incident side of the light guide plate, effectively reducing material costs. For direct-lit backlights, multiple LEDs in the LED array can be covered with interference filters 100; here, a suitable mesh fixing structure can be used to fix the interference filters 100. When used as a performance enhancement component in large-screen LCD devices or micron-level self-emissive display devices, the edges of the interference filters 100 can be polished smooth, laid on the inside of the glass cover plate, and tightly joined in pairs. A liquid optical adhesive with a similar refractive index is injected at the edge seams, thereby effectively improving the display effect.

[0082] In an optional embodiment, the film layer 30 faces the incident light side; when the incident angle of the light is 0° or 45°, the transmittance of the notch interference filter is less than or equal to 45% at wavelengths of 500nm to 510nm, and greater than or equal to 80% at wavelengths of 532nm to 700nm and 420nm to 480nm.

[0083] Alternatively, the film layer 30 faces away from the incident light side. When the incident angle of the light is 0° or 28°, the transmittance of the notch filter is set to be less than or equal to 45% in the wavelength range of 500nm to 510nm, and greater than or equal to 80% in the wavelength ranges of 532nm to 700nm and 420nm to 480nm.

[0084] Since the multilayer film 30 is disposed on the same side of the substrate 10, when light is incident on the interference filter 100, the film 30 can face the light-incident side of the light source and the light-exit side away from the light source. Therefore, the required transmittance is different depending on whether it is disposed on the light-incident side or the light-exit side.

[0085] Specifically, when the film layer 30 faces the light-incident side, that is, when light is incident from air onto the optical film (Air to Glass), under positive angle conditions (the angle between the incident light and the film normal is 0°, Incident Angle = 0°), the transmittance in wavelengths of 532nm–700nm and 420nm–480nm is greater than or equal to 80%, preferably greater than or equal to 90%, for example, 95%, thereby reducing the loss and waste of the light source. Meanwhile, the transmittance of light in the wavelength range of 500nm–510nm is less than or equal to 45%, preferably less than or equal to 35%, for example, 25%, 30%, etc., thus meeting design requirements and effectively removing most of the light linearity detrimental to color displays, significantly reducing its energy and thus improving the display effect.

[0086] When incident light is incident at an angle of 45° (the angle between the incident light and the normal of the thin film is 45°, IncidentAngle = 45°), the transmittance of light with wavelengths of 532nm to 700nm and 420nm to 480nm is set to be greater than or equal to 80%, and the transmittance of light with wavelengths of 500nm to 510nm is less than or equal to 45%. This allows the interference filter 100 to have angle-insensitive characteristics, ensuring good filtering effect even at a wide viewing angle, so as to ensure the display effect of the display device.

[0087] When the film layer 30 faces away from the light-incident side, that is, when light enters the air from the glass substrate, under positive angle conditions (the angle between the incident light and the normal to the film is 0°, and the incident angle is 0°), the transmittance in the wavelength ranges of 532nm–700nm and 420nm–480nm is greater than or equal to 80%. Preferably, the transmittance in both wavelength ranges is set to be greater than or equal to 90%, thereby further improving the passage of unrestricted light and avoiding excessive loss. The transmittance in the wavelength range of 500nm–510nm is less than or equal to 45%, preferably less than or equal to 35%, thus meeting design requirements and effectively removing most of the light linearity detrimental to color displays, significantly reducing its energy and improving display performance. When the incident light is incident at an angle of 28° (the angle between the incident light and the normal of the thin film is 28°, Incident Angle = 28°), the transmittance of wavelengths from 532nm to 700nm and from 420nm to 480nm is set to be greater than or equal to 80%, preferably greater than or equal to 90%, and the transmittance of light in the wavelength range of 500nm to 510nm is less than or equal to 45%, preferably less than or equal to 35%. This allows the interference filter 100 to have angle-insensitive characteristics, ensuring good filtering effect even at a wide viewing angle, so as to ensure the display effect of the display device.

[0088] The technical concept of this invention does not unilaterally pursue the highest possible transmittance of the passband, nor does it unilaterally pursue the lowest possible transmittance of the cutoff band, but rather aims to achieve the characteristic of being as insensitive to angle as possible.

[0089] The present invention also proposes an interference filter 100 for use in an LED display device. The backlight module of the LED display device is provided with an optical film containing phosphor. The interference filter 100 is a short-wavelength pass interference filter 100, and the wavelength range that the short-wavelength pass interference filter 100 is allowed to pass through is less than 478nm.

[0090] The interference filter 100 includes a substrate 10 and a multilayer film 30. The film 30 includes a first refractive index film 31 and a second refractive index film 33. The refractive index of the second refractive index film 33 is higher than that of the first refractive index film 31. One of the first refractive index films 31 is disposed on one surface of the substrate 10. One of the second refractive index films 33 is disposed on the opposite side of the first refractive index film 31 that is in contact with the substrate 10. Another of the first refractive index films 31 is disposed on the surface of the second refractive index film 33 that is away from the first refractive index film 31.

[0091] In this embodiment, the interference filter 100 is a short-wavelength pass interference filter 100, that is, it allows short-wavelength light to pass through. Here, the short-wavelength range is less than 478nm. The structure of the interference filter 100 is roughly the same as that of the notch filter 100 described above. The materials of the substrate 10 and the film layer 30, as well as their processing methods, will not be described in detail here. Unlike the above embodiments, this interference filter 100 is mainly used in LED packages that do not contain phosphor / phosphorescent conversion materials, but instead achieve three-color or multi-color display systems through optical structures such as diffusers with phosphors. It mainly allows short-wavelength light to pass through, filtering out or greatly reducing the long tail of the wavelength portion >478nm in blue LEDs or cyan LEDs, which are detrimental to color display design.

[0092] In an optional embodiment, the total number of film layers 30 is greater than 10 layers and less than 40 layers.

[0093] The number of film layers 30 on the substrate 10 should not be too small, otherwise it will not achieve a good light filtering effect. Of course, based on cost, the number of film layers 30 should not be too large either. Here, according to the range of short wavelength pass and the angle insensitivity achieved, the total number of film layers 30 is set to be greater than 10 layers and less than 40 layers, such as 15 layers, 20 layers, 25 layers and 30 layers, so as to ensure the light filtering effect and angle insensitivity performance.

[0094] In an optional embodiment, the total thickness of the multiple layers 30 is less than or equal to 4200 nm;

[0095] And / or, the thickness of each of the first refractive index film layer 31 or the second refractive index film layer 33 is greater than or equal to 10 nm and less than or equal to 1000 nm.

[0096] In this embodiment, the thickness of each film layer 30 should not be too small, otherwise the required refractive index will not be achieved. Of course, the thickness of the film layer 30 should not be too large either, otherwise the material cost will increase. Here, the thickness range of the film layer 30 is set to 10nm to 1000nm, for example, 10nm, 50nm, 100nm, 150nm, 200nm, 300nm, 400nm, 500nm, 600nm, etc., which can save costs while achieving the required refractive index.

[0097] As the number of film layers 30 increases, the total thickness of the multilayer film layers 30 also increases. Here, the total thickness range is set to be less than or equal to 4200 nm, for example, 1000 nm, 2000 nm, 3000 nm, 4000 nm, 4200 nm, etc., which can be set according to the number of layers and the thickness of each layer as needed. Of course, the thicknesses of the multilayer film layers 30 can all be different, or some can be different.

[0098] In an optional embodiment, the film layer 30 faces the light incident side; when the incident angle of light is 0°, the transmittance of the short-wavelength pass interference filter 100 for wavelengths in the range of 515nm to 700nm is less than or equal to 25%, and the transmittance for wavelengths in the range of 420nm to 480nm is greater than or equal to 80%; when the incident angle of light is 45°, the transmittance of the short-wavelength pass interference filter 100 for wavelengths in the range of 490nm to 700nm is less than or equal to 45%, and the transmittance for wavelengths in the range of 420nm to 462nm is greater than or equal to 80%.

[0099] Alternatively, with the film layer 30 facing away from the incident light side, when the incident angle of the light is 0°, the transmittance of the short-wavelength pass interference filter 100 for wavelengths in the range of 515nm to 700nm is less than or equal to 25%, and the transmittance for wavelengths in the range of 420nm to 480nm is greater than or equal to 80%; when the incident angle of the light is 28°, the transmittance of the short-wavelength pass interference filter 100 for wavelengths in the range of 490nm to 700nm is less than or equal to 45%, and the transmittance for wavelengths in the range of 420nm to 462nm is greater than or equal to 80%.

[0100] Specifically, when the film layer 30 faces the light-incident side, that is, when light is incident from air onto the optical film (Air to Glass), under positive angle conditions (the angle between the incident light and the film normal is 0°, or Incident Angle = 0°), the transmittance in the wavelength range of 420nm to 480nm is greater than or equal to 80%, preferably greater than or equal to 90%, for example, 95%, thereby reducing the loss and waste of the light source. Meanwhile, the transmittance of light in the wavelength range of 515nm to 700nm is less than or equal to 25%, preferably less than or equal to 10%, for example, 5%, 8%, etc., thus meeting design requirements and effectively removing most of the light linearity detrimental to color displays, significantly reducing its energy and thereby improving the display effect.

[0101] When incident light is incident at a 45° angle (the angle between the incident light and the normal to the thin film is 45°, IncidentAngle = 45°), the transmittance for wavelengths of 420nm to 462nm is set to be greater than or equal to 80%, preferably greater than or equal to 90%, for example, 95%, for wavelengths of 420nm to 470nm, thereby reducing the loss and waste of the light source. The transmittance for light in the wavelength range of 490nm to 700nm is less than or equal to 45%, preferably less than or equal to 25%, so that the interference filter 100 has angle-insensitive characteristics, ensuring good filtering effect even at a wide viewing angle, thereby ensuring the display effect of the display device.

[0102] When the film layer 30 faces away from the light-incident side, that is, when light enters the air from the glass substrate, under positive angle conditions (when the angle between the incident light and the normal to the film is 0°, the incident angle = 0°), the transmittance for wavelengths of 420nm to 480nm is greater than or equal to 80%, preferably greater than or equal to 90%, thereby further improving the passage of unrestricted light and avoiding excessive loss. The transmittance for light in the wavelength range of 515nm to 700nm is less than or equal to 45%, preferably less than or equal to 35%, thus meeting design requirements and effectively removing most of the light linearity detrimental to color displays, significantly reducing its energy and improving display performance. When the incident light is incident at an angle of 28° (the angle between the incident light and the normal of the thin film is 28°, Incident Angle = 28°), the transmittance of wavelengths from 532nm to 700nm and from 420nm to 480nm is set to be greater than or equal to 80%, preferably greater than or equal to 90%, and the transmittance of light in the wavelength range of 500nm to 510nm is less than or equal to 45%, preferably less than or equal to 35%. This allows the interference filter 100 to have angle-insensitive characteristics, ensuring good filtering effect even at a wide viewing angle, so as to ensure the display effect of the display device.

[0103] Please combine Figures 3 to 14 Below are four examples suitable for low blue light display devices: blue LEDs with high color gamut narrow-spectrum RG phosphors embedded in the package; blue LEDs with high color gamut Red / Green quantum dot particles embedded in the package; RGCv (red-green-cyan-blue-blue-violet) four-primary-color MicroLED displays; and RGCv four-primary-color LCD displays. These are all notch filters with a relatively small notch band variation of 478nm to 515nm with respect to the incident angle.

[0104] Example 1:

[0105] The design conditions are as follows: the substrate is glass with a refractive index of 1.51896, the type is Airto Glass, the total number of film layers is 16, and the total thickness is 1458.16 nm. The material and thickness settings of each film layer are shown in Table 1 below.

[0106]

[0107] Please refer to Figure 3 The structure of the interference filter designed with the parameters in Table 1 above shows its spectral transmittance at the frontal viewing angle. It can be seen that the transmittance of light waves in the wavelength range of 478nm to 515nm is no more than 30%, which can effectively remove cyan light in this band, thereby effectively improving the display effect of the display device.

[0108] Please refer to Figure 4 and Figure 5 The image shows a three-dimensional spectrum composed of wavelength, transmittance, and incident angle. It can be seen that the wavelength in the range of 478nm to 515nm does not change significantly with the change of incident angle. Furthermore, the transmittance of the wavelength in the range of 478nm to 515nm does not change much with the change of incident angle, thus achieving the characteristic of being angle-insensitive. This effectively ensures the filtering of light in the range of 478nm to 515nm, allowing the display device to obtain a good display effect from various viewing angles.

[0109] Example 2:

[0110] The design conditions are as follows: the substrate is glass with a refractive index of 1.51868, the type is Airto Glass, the total number of film layers is 23, and the total thickness is 2063.24 nm. The material and thickness settings of each film layer are shown in Table 2 below.

[0111]

[0112]

[0113] Please refer to Figure 6 The structure of the interference filter designed with the parameters in Table 2 above shows its spectral transmittance at the frontal viewing angle. It can be seen that the transmittance of light waves in the wavelength range of 478nm to 515nm is no more than 40%, which can effectively remove cyan light in this band, thereby effectively improving the display effect of the display device.

[0114] Please refer to Figure 7 and Figure 8The image shows a three-dimensional spectrum composed of wavelength, transmittance, and incident angle. It can be seen that the wavelength in the range of 478nm to 515nm does not change significantly with the change of incident angle. Furthermore, the transmittance of the wavelength in the range of 478nm to 515nm does not change much with the change of incident angle, thus achieving the characteristic of being angle-insensitive. This effectively ensures the filtering of light in the range of 478nm to 515nm, allowing the display device to obtain a good display effect from various viewing angles.

[0115] Since the two embodiments described above involve light-dense medium entering light-dense medium, there is no total internal reflection phenomenon, and therefore they are effective within the incident angle range of 0° to 90°.

[0116] Example 3:

[0117] The design conditions are as follows: the substrate is glass with a refractive index of 1.51908, the type is Glassto Air, the total number of film layers is 23, and the total thickness is 2425.93 nm. The material and thickness settings of each film layer are shown in Table 3 below:

[0118]

[0119]

[0120] Please refer to Figure 9 and Figure 10 The structure of the interference filter designed with the parameters in Table 3 above, and its spectral transmittance curve and figure at the frontal viewing angle, show that the transmittance of light waves in the wavelength range of 478nm to 515nm is no more than 30%, which can effectively remove cyan light in this band, thereby effectively improving the display effect of the display device.

[0121] Please refer to Figure 11 The figure shows a three-dimensional spectrum composed of wavelength and incident angle. It can be seen that the wavelength in the range of 478nm to 515nm does not change much with the change of incident angle from 0° to 40° in the range of low transmittance. This achieves the characteristic of being insensitive to angles from 0° to 40°, which can effectively ensure the filtering of light in the range of 478nm to 515nm, so that the display device can obtain a good display effect from various viewing angles.

[0122] Example 4:

[0123] The design conditions are as follows: the substrate is glass with a refractive index of 1.51925, the type is Glassto Air, the total number of film layers is 21, and the total thickness is 2399.16 nm. The material and thickness settings of each film layer are shown in Table 4 below:

[0124]

[0125]

[0126] Please refer to Figure 12 and Figure 13 The structure of the interference filter designed with the parameters in Table 4 above, and its spectral transmittance curve and figure at the frontal viewing angle, show that the transmittance of light waves in the wavelength range of 478nm to 515nm is no more than 30%, which can effectively remove cyan light in this band, thereby effectively improving the display effect of the display device.

[0127] Please refer to Figure 14 The figure shows a three-dimensional spectrum composed of wavelength and incident angle. It can be seen that the wavelength in the range of 478nm to 515nm does not change much with the change of incident angle from 0° to 40° in the range of low transmittance, that is, the notch band does not change much. Thus, it achieves the characteristic of being insensitive to angles from 0° to 40°, which can effectively ensure the filtering of light in the range of 478nm to 515nm, so that the display device can obtain a good display effect from various viewing angles.

[0128] Since the light paths in Examples 3 and 4 enter from the optically denser medium into the optically less dense medium, total internal reflection occurs. For incident light from the glass side, the incident angle is only effective within the range of 0° to 41°, while on the air side it is effective within the range of 0° to 90°.

[0129] Please combine Figures 15 to 20 Below are two examples suitable for packages containing only blue LEDs, with color conversion materials (such as phosphor diffusion films, phosphorescent diffusion films, and QD diffusion films) placed after the interference filter's optical path. These are suitable for blue-emitting LCD backlight arrays, or LCD backlight arrays composed of Cyan-blue and violet-blue LEDs, with a Quantum Dot color conversion film or a phosphor color conversion film placed after the interference filter. Both are short-wavelength pass filters (less than 478 nm) with relatively small changes in spectral passband with the incident angle.

[0130] Example 5:

[0131] The design conditions are as follows: the substrate is glass with a refractive index of 1.51868, the type is air-to-glass, the total number of film layers is 17, and the total thickness is 1442.68 nm. The material and thickness settings of each film layer are shown in Table 5 below:

[0132]

[0133]

[0134] Please refer to Figure 15 and Figure 16 The structure of the interference filter designed with the parameters in Table 5 above, and its spectral transmittance curve and figure at the frontal viewing angle, show that the transmittance of light waves with wavelengths greater than 478nm is no more than 40%, which can effectively remove unfavorable light and thus effectively improve the display effect of the display device.

[0135] Please refer to Figure 17 The figure shows a three-dimensional spectrum composed of wavelength and incident angle. It can be seen that the range of short wavelength passband does not change much with the change of incident angle in the wavelength range of less than 478nm, thus achieving the characteristic of angle insensitivity. It can effectively ensure the filtering of light in the range of greater than 478nm, so that the display device can obtain a good display effect from all viewing angles.

[0136] Example 6:

[0137] The design conditions are as follows: the substrate is glass with a refractive index of 1.51868, the type is Glassto Air, the total number of film layers is 20, and the total thickness is 2027.30 nm. The material and thickness settings of each film layer are shown in Table 6 below:

[0138]

[0139]

[0140] Please refer to Figure 18 and Figure 19 The structure of the interference filter designed with the parameters in Table 4 above, and its spectral transmittance curve and figure at the frontal viewing angle, show that the transmittance of light waves with wavelengths greater than 478nm is no more than 30%, which can effectively remove unfavorable light in this band, thereby effectively improving the display effect of the display device.

[0141] Please refer to Figure 20 The figure shows a three-dimensional spectrum composed of wavelength and incident angle. It can be seen that the wavelength in the range of less than 478nm does not change much with the change of incident angle from 0° to 40° in the range of low transmittance. That is, the short wavelength passband does not change much, thus achieving the characteristic of being insensitive to angles from 0° to 40°. This can effectively ensure the filtering of light in the range of greater than 478nm, so that the display device can obtain a good display effect from various viewing angles.

[0142] The present invention also proposes an optical component (not shown), the optical component comprising an interference filter, wherein the interference filter is any of the interference filters described above;

[0143] A prism focusing film is provided in the front optical path of the interference filter;

[0144] And / or, an optical diffusion film is provided in the rear optical path of the interference filter.

[0145] In this embodiment, an optical component can be formed using an interference filter. Preferably, a prism focusing film is used in the front optical path of the angle-insensitive interference filter, and an optical diffusion film is used in the rear optical path of the interference filter, which can achieve a near-perfect full-view, color-shift-free display effect of 80° to 85°. Of course, in other embodiments, a prism focusing film can be provided only in the front optical path of the interference filter, or an optical diffusion film can be provided in the rear optical path of the interference filter, which can also achieve the purpose of improving the display effect. This optical component, as a functional performance enhancement component of a color display, is widely applicable to color display modules of mobile phones, tablet computers, portable computers, desktop computers, home television receivers, etc.

[0146] The present invention also proposes a display module (not shown), including a backlight module. The backlight module includes a back panel, a light source, and an interference filter as described above. The light source is disposed on the back panel, and the interference filter is disposed on the light-emitting side of the light source. Since the interference filter of this display module adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0147] The display module of this embodiment can be used in MicroLED displays for extremely small VR / near-eye displays; it can also be used in displays of small to medium size (such as wearables and mobile phones). Due to the increase in size, the design of this invention does not unilaterally pursue the highest possible transmittance of the spectral passband and the lowest possible transmittance of the spectral cutoff band; instead, it chooses "angle insensitivity" while pursuing as few film layers as possible, thin film system thickness, minimum single layer thickness ≥10nm, and allowing certain coating thickness tolerances as much as possible.

[0148] It can also be used in large and medium-sized LCD displays (such as computer monitors, home / commercial TV receivers, etc.) that use Mini-LED backlighting; since the size of a single interference filter is limited, when applying the design of this invention, a small interference filter design should be adopted, with each interference filter covering one or more LEDs, and an array of several interference filters filling the entire visible area of ​​the display in the backlight module.

[0149] The backlight module here can be either side-lit or direct-lit. When it is side-lit, the interference filter is placed on the side of the light guide plate facing the light source. When it is direct-lit, an interference filter is placed on each of the multiple LED beads.

[0150] Of course, the display module also includes a display panel positioned opposite the backlight module. In addition to the aforementioned interference filter, improvements can be made to the color substrate in the display panel. Specifically, when the LCD's color filter is a traditional pigment-based negative photoresist structure, appropriately increasing the pigment concentration, increasing the thickness of the color substrate, or increasing the proportion of auxiliary pigments can increase the separation between the green and blue primary colors.

[0151] This is because traditional color filters are made of pigments, or pigments and dyes. They are actually made by mixing multiple colorants. For example, color filters with red and green primary colors are usually mixed with yellow pigments to reduce their transmittance in the blue band (short wavelength of visible light). Color filters with blue primary colors are mixed with purple pigments to appropriately reduce the long wavelength cutoff of the blue primary color passband and prevent the blue primary color of the display from being mixed with too much green light.

[0152] Therefore, in the technical solution of the present invention, the thickness or pigment concentration of the green and blue resists in the color mold substrate can be increased, or yellow pigment 139 (PY139) can be appropriately added to the green resist, or the proportion of yellow pigment (PY150) can be appropriately increased, or the proportion of purple pigment 23 (PV23) can be appropriately increased to the blue resist, or several of the above solutions can be implemented simultaneously. This solution can be combined with the above interference filter to further improve the display performance of hardware low blue light or RGCv (red-green-cyan-blue-blue-violet) four-primary-color MicroLED display.

[0153] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. An optical component, the optical component comprising an interference filter, the interference filter being applied in a low blue light three-primary-color display device or a red, green, cyan, and blue-violet four-primary-color display device, the interference filter being a notch interference filter, the notch interference filter having a filtering wavelength range of 478nm to 515nm; The interference filter includes a substrate and multiple layers of films. Each layer includes a first refractive index film and a second refractive index film, wherein the refractive index of the second refractive index film is higher than that of the first refractive index film. One first refractive index film is disposed on a surface of the substrate; one second refractive index film is disposed on the opposite side of the first refractive index film that contacts the substrate; and another first refractive index film is disposed on the surface of the second refractive index film that is away from the first refractive index film. The first refractive index film is made of silicon dioxide or magnesium fluoride; the second refractive index film is made of titanium dioxide or titanium pentoxide; the total number of layers is greater than 10 and less than 60; the total thickness of the multiple layers is less than or equal to 6000 nm; and the thickness of each first or second refractive index film is greater than or equal to 10 nm and less than or equal to 1000 nm. When the film is oriented towards the incident light side, and the incident angle of the light is 0° or 45°, the transmittance of the notch filter is less than or equal to 45% in the wavelength range of 500nm to 510nm, and greater than or equal to 80% in the wavelength range of 532nm to 700nm or 420nm to 480nm. The interference filter is provided with at least one of the following films: a prism focusing film in the front optical path and an optical diffusion film in the rear optical path.

2. The optical component as described in claim 1, characterized in that, The substrate is made of glass or resin.

3. The optical component as described in claim 1, characterized in that, The total number of film layers is greater than 15 and less than 25.

4. The optical component as claimed in claim 1, characterized in that, The interference filter is square, rectangular, or hexagonal in shape.

5. The optical component as claimed in claim 1, characterized in that, When the film layer faces away from the incident light side, and the incident angle of the light is 0° or 28°, the transmittance of the notch filter is set to be less than or equal to 45% in the wavelength range of 500nm to 510nm, and greater than or equal to 80% in the wavelength ranges of 532nm to 700nm and 420nm to 480nm.

6. An optical component, characterized in that, The invention includes an interference filter used in LED display devices, wherein the backlight module of the LED display device is provided with an optical film containing phosphor, and the interference filter is a short-wavelength pass interference filter, wherein the wavelength range allowed to pass through the short-wavelength pass interference filter is less than 478nm; The interference filter includes a substrate and multiple layers of films. Each layer includes a first refractive index film and a second refractive index film, wherein the refractive index of the second refractive index film is higher than that of the first refractive index film. One first refractive index film is disposed on one surface of the substrate, one second refractive index film is disposed on the opposite side of the first refractive index film that contacts the substrate, and another first refractive index film is disposed on the surface of the second refractive index film that is away from the first refractive index film. The total number of layers is greater than 10 and less than 40. The total thickness of the multiple layers is less than or equal to 4200 nm. The thickness of each first or second refractive index film is greater than or equal to 10 nm and less than or equal to 1000 nm. When the film layer faces the incident light side; when the incident angle of the light is 0°, the transmittance of the short-wavelength pass interference filter for the wavelength range of 515nm to 700nm is less than or equal to 25%, and the transmittance for the wavelength range of 420nm to 480nm is greater than or equal to 80%; when the incident angle of the light is 45°, the transmittance of the short-wavelength pass interference filter for the wavelength range of 490nm to 700nm is less than or equal to 45%, and the transmittance for the wavelength range of 420nm to 462nm is greater than or equal to 80%. The interference filter is provided with at least one of the following films: a prism focusing film in the front optical path and an optical diffusion film in the rear optical path.

7. The optical component as claimed in claim 6, characterized in that, When the film layer faces away from the incident light side, and the incident angle of the light is 0°, the transmittance of the short-wavelength pass interference filter for wavelengths in the range of 515nm to 700nm is less than or equal to 25%, and the transmittance for wavelengths in the range of 420nm to 480nm is greater than or equal to 80%; when the incident angle of the light is 28°, the transmittance of the short-wavelength pass interference filter for wavelengths in the range of 490nm to 700nm is less than or equal to 45%, and the transmittance for wavelengths in the range of 420nm to 462nm is greater than or equal to 80%.

8. A display module, characterized in that, The device includes a backlight module, which includes a back panel, a light source, and an optical component as described in any one of claims 1 to 7. The light source is disposed on the back panel, and the interference filter of the optical component is disposed on the light-emitting side of the light source.

Images