TW201040629A - Back light module and display device - Google Patents

Abstract

A back light module including a light box, at least one light source, a substrate and a first wave-length transforming layer is provided. The light box has an opening and a bottom portion opposite thereto. The light source is disposed in the light box. The substrate is disposed on the opening. The substrate has at least one first arc-surface structure facing to the light source. The wave-length transforming layer is conformed to the first arc-surface structure of the substrate and at least partial of the first wave-length light from the light source irradiates the first wave-length transforming layer to transform into a visible light.

Description

201040629湖TW 27459twf.doc/n VI. Description of the Invention: [Technical Field] The present invention relates to a backlight module and a display device, and particularly to a backlight module and a display device with good uniformity of light emission . [Prior Art] Since the liquid crystal display device is a non-self-luminous display device, it is necessary to provide a light source such as a backlight module from the outside to display an image. At present, a common backlight module uses a Cold Cathode Fluorescence Lamp (CCFL), a Light Emitting Diode (LED), or the like as a light source. One of the main illumination principles of a cold cathode lamp and a light source such as a light-emitting diode is that the excitation light emitted by the light source is converted into visible light by being absorbed by the fluorescent material inside the lamp tube or in the diode package. — In general, the light source emits ultraviolet light or the rest of the more powerful light. The fluorescent material absorbs high-energy light for a long time, which is prone to deterioration or unstable state. The light-emitting efficiency and reliability of light sources such as cold cathode lamps and light-emitting diodes may be reduced, and it is more likely to further affect the quality of the surface of the display device, such as the occurrence of kneading color distortion. In order to avoid affecting the quality of the display device due to poor reliability of the light source, a technique in which a 波长-type wavelength conversion layer is disposed on a diffusion plate is proposed (Photo Excited Luminescent Plate, PELP). FIG. 1 is a partial schematic view of a conventional backlight module using PELP technology, in which only a light source, a wavelength conversion layer, and a diffusion plate are depicted. Referring to the figure, the backlight module 1 〇〇 mainly arranges the wavelength conversion layer 11 〇 uniformly on the diffusion plate 12 而非 instead of 201040629 27459 twf.doc/n. At this time, among the light emitted by the light source ls〇, some of the light with too high energy may be excessively smashed by the outer packaging material (for example, the glass tube of the cold cathode lamp tube and the high molecular polymer of the light emitting diode) The material is then irradiated to the wavelength conversion layer to be converted into visible light 142. Therefore, the wavelength conversion layer U0 is not easily deteriorated. In other words, this design will improve the reliability of the light source of the optical module 100. However, in the backlight unit 100 described above, the laser light 132 emitted from the light source 130 is incident on the wavelength conversion layer 11A at different angles. Therefore, the inconsistencies in the thickness of the wavelength conversion layer 11A through the different regions of the laser light 132 may cause the light-emitting rates of the wavelength conversion layers 110 in different regions to be different. Therefore: The optical model _100 has a problem of poor uniformity of light output. The light output of the cover group (10) increases the cost of the light source 130 and increases the energy consumption. In short, although the design of the backlight module 1〇〇 has high light source reliability, there are still many problems that need to be revised and solved. [Survey] The present invention provides a backlight module to solve the problem that the angle of incidence of the first wavelength of light into the wavelength conversion layer is different in the conventional backlight module. The present invention further provides a backlight module to solve the problem of inconsistent light-emitting efficiency of the wavelength conversion layer. The present invention further provides a display device for solving the problem of affecting display quality due to poor uniformity of light output from the backlight module. The present invention provides a backlight module 'including a light box, at least one light 27459t\vf.doc/n

201040629, ivlZiTW source, - substrate and - first wavelength conversion layer. The light box has an opening and a bottom opposite the opening. The light source is disposed in the light box, and the light source can emit light of a first wavelength. The substrate is disposed on the opening of the light box. At least one first-faceted structure facing the light source. The first wavelength is placed on the first-curved surface structure of the substrate, and at least part of the 苐-wavelength light emitted by the light source is irradiated to the first wavelength conversion layer to be converted into a visible light. 〇 Shuming also proposes a display device comprising a display panel and a backlight module located below the display panel. Specifically, the backlight module includes a light box, at least one light source, a substrate, and a first wavelength conversion layer. The light box has a mouth and a bottom opposite the opening. The light source is disposed in the light box, and the light source emits 苐-wavelength light. The substrate is disposed on the opening of the light box. At the same time, the substrate has at least one first-curved surface structure facing the light source. The first wavelength conversion layer is conformally disposed on the first curved surface structure of the substrate, and at least a portion of the light of the first wavelength emitted by the light source is irradiated to the first wavelength conversion layer to be converted into a visible light. In a backlight module and a display device according to an embodiment of the present invention, the light source may be a light emitting diode, a cold cathode light tube, an external electrode light tube, a hot cathode light tube or a laser diode. body. In a backlight module and a display device according to an embodiment of the invention, the light source is located below the first curved surface structure. In a backlight module and a display device according to an embodiment of the invention, the first orphan plane structure and the light source extend in a fixed direction. In addition, the first curved surface structure is an arc on a section of the substrate whose normal direction is a fixed line, and the light source position 201040629

In the backlight module and the display device, the backlight module further includes a reflective layer disposed at the bottom. The reflective layer has at least one reflective layer, for example. The second arc surface structure. The second second surface structure is a round fox on a section of the reflective layer with the fixed direction as a normal line, and the light source is located at an i-core of the arc. The backlight module further includes a second wavelength conversion. a layer disposed in conformal manner on the second arcuate structure of the reflective layer. In the backlight module and the display device of the embodiment of the present invention, at least part of the light of the first wavelength emitted by the light source is substantially In a backlight module and a display device according to an embodiment of the present invention, the first wavelength conversion layer may have a plurality of phosphors, a plurality of phosphors, or a combination thereof. In the module and the display device, the substrate is, for example, a diffusion plate. The present invention further provides a backlight module including a light box, at least one light source, a first substrate, a wavelength conversion layer, and a second base. Material. Light! And the bottom of the light source is disposed opposite to the opening. The light source is disposed at a source of the light box to emit light of a first wavelength. The first substrate is disposed on the light box, and the wavelength conversion layer is disposed on the first substrate. The second substrate is "medium" and disposed between the first substrate and the light source. At least a portion of the nuclei are refracted by the second substrate and then vertically incident on the wavelength conversion layer to be converted into a visible light. Backlighting A display device includes a display panel and an address, and an H-light pool is located below the display panel. The f-light module includes a 201040629.iZITW 27459twf.doc/n box, at least one light source, a first substrate, a wavelength conversion layer, and a second substrate. The light box has an opening and a bottom opposite the opening. The light source is disposed in the light box, and the light source can emit light of a first wavelength. The second substrate is placed on the opening of the light box. Further, the wavelength conversion layer is disposed on the first substrate, and the second substrate is disposed in the light box and disposed between the first substrate and the light source 0. At least a portion of the light of the first wavelength emitted by the light source is refracted by the second substrate and then vertically incident on the wavelength conversion layer to be converted into a visible light. In a backlight module and a display device according to an embodiment of the invention, the light source comprises a light emitting diode, a cold cathode lamp, an external electrode tube, a second hot cathode tube or a laser diode. In a backlight module and a display device according to an embodiment of the invention, at least a portion of the light of the first wavelength emitted by the light source is an invisible light. In the backlight module and the display device according to an embodiment of the present invention, the wavelength conversion layer may have a plurality of phosphor powders, a plurality of phosphor powders, or a combination thereof. o In a backlight module and a display device according to an embodiment of the present invention, the backlight, and a reflective layer are disposed at the bottom of the light box. The backlight module and the display substrate of one embodiment of the present invention are, for example, i-scatter plates. And the substrate of the Φ structure or the substrate of the source of energy is disposed above the light source, so that at least part of the light passes through the thickness of the wavelength conversion layer. Roughly the same. The wavelength conversion layer can provide substantially the same illuminating effect structure in different regions to give the backlight module a uniform light-emitting effect. In addition, the backlight module does not need to be equipped with a high light source of 201040629 r υ / Λ τ ψ 27459 twf.doc/n to help reduce the energy consumption and materials of the backlight module. The above and other objects, advantages and advantages of the present invention will become more apparent. The preferred embodiments of the present invention are described in the following description. 2 is a schematic cross-sectional view of a backlight module according to a first embodiment of the present invention. Referring to FIG. 2A, the backlight module 2 includes a light box 2, a light (four), a base, and a _wavelength The '^^ lamp phase 21G has an opening 212 and a bottom 214 opposite the opening 212. The light source 220 is disposed in the light box 21A, and the light source 22 emits light 222 of the first wavelength. The substrate 230 is disposed on the port 212 of the light box 21A. At the same time, the substrate 230 has at least one first curved surface structure 232 facing the light source 22A and the 苐 orbital structure 232 adjacent to each other. The first wavelength converting layer is conformally disposed on the first curved surface structure 232 of the substrate 230. "Conformal" as used in this specification means that the surfaces of two overlapping structures have substantially the same undulations. For example, the thickness of the first wavelength conversion layer is uniform, so after the first wavelength conversion layer is disposed on the first curved surface structure 232, the surface of the first wavelength conversion layer 24 and the first curved surface structure The surface of 232 will have approximately the same undulations. In the present embodiment, the substrate 230 is, for example, a diffusion plate or other optical plate that can be applied to the optical module 200. The light source 22 is, for example, a light emitting diode, a cold cathode lamp, an external electrode tube, a hot cathode avIZITW 27459twf.doc/n 201040629 lamp or a laser diode or the like. Alternatively, the first wavelength converting layer 240 may have a plurality of phosphors, a plurality of phosphors, combinations thereof, or other wavelength converting materials. At least a portion of the light 222 of the first wavelength emitted by the light source 220 illuminates the first wavelength conversion layer 240 to cause the phosphor or phosphor to be excited to generate visible light 242 for utilization. In general, the first wavelength of light 222 can be an invisible light in this embodiment. Of course, the light 222 of the first wavelength may also be visible light, which is suitable for a substance such as phosphor powder or light-filling powder of the first wavelength conversion layer 240. In this embodiment, disposing the first wavelength conversion layer 24A outside the light source 220 helps to improve the reliability of the first wavelength conversion layer 24A. Therefore, the backlight module 200 can have a long service life. As can be seen from the description of the prior art, when the first wavelength conversion layer 240 is disposed on a plane, the light 222 of the first wavelength incident from different angles is different in thickness of the first/skin length conversion layer 240, and may exhibit different luminous efficiency. . Therefore, in order to make the light-emitting efficiency provided by the first wavelength conversion layer at each position uniform to exhibit good light-emitting uniformity, it is preferable that the light of the first wavelength light 222 passes through the first wavelength conversion layer 240 to have substantially the same thickness. In the present embodiment, each of the light sources 220 is located below a corresponding one of the first curved surface structures 232, while the first wavelength converting layer 240 is conformally disposed on the first curved surface structure 232. Therefore, the incident angle of the first wavelength of light 222 entering the first wavelength converting layer 240 can be compensated, that is, the thickness of the first wavelength of light 222 scattered to different angles through the first wavelength converting layer 24 is not significantly different. In other words, the first wavelength conversion layer 240 can emit relatively uniform visible light 242, and the uniformity of light emission of the backlight module 200 is improved. 201040629 j. ν» / a 1W 27459twf.doc/n Specifically, each of the first curved surface structures 232 and the light source 22 〇 extends, for example, in a fixed direction E, wherein the fixed direction is, for example, a vertical pattern direction. That is, the light source 22 of the present embodiment is exemplified by a light source of a tubular structure such as a cold cathode lamp or the like, and the fixing direction is a direction in which the g-like structure extends. The first orbital structure 232 is, for example, an elongated concave-convex structure formed on the substrate 230 and extending in a fixed direction. In addition, if the cross section of the backlight module 2 is cut in a fixed direction E, the first orbital structure 232 will exhibit at least one arc as shown in FIG. 2A. In addition, the position of the light source 220 is substantially the arc center of the arcs. Thus, the first wavelength of light 222 emitted by each of the light sources 220 is substantially incident on the corresponding first curved surface structure 2 at the same angle. Therefore, the first wavelength of light 222 passes through the first wavelength conversion layer 24 〇 substantially the same thickness to help provide uniformly distributed visible light 242, so the backlight, group 200 has a good light-emitting effect. It is worth mentioning that, according to the result of the actual measurement, when the first-wavelength light 222 is irradiated to the first wavelength conversion layer 240 at a nearly vertical incident angle, the fluorescent material in the first wavelength conversion layer 240 will be the first wavelength. The conversion rate of the light 222 into visible light 242 is greater than the conversion rate at the time of incidence. In other words, the design of the embodiment helps to improve the light-emitting uniformity of the backlight module 200, and further improves the conversion efficiency of the first wavelength conversion layer 240. The Fig. 2B fin shows a schematic cross-sectional view showing the arrangement relationship between a light source and a substrate. Referring to FIG. 2B, in an embodiment, the arc of the first curved surface structure 232 may be a portion of the circular track 250. The circular trace 250 is, for example, centered on the light source 220, and is a trace of the radius R between the light source 220 and the substrate 230 of 10 201040629 at a distance of 1TW 27459 twf.doc/n. Referring to FIG. 2 and FIG. 2B at the same time, under such a configuration relationship, the light (2) emitted by the light source 22 is emitted to different angles, but the wavelength conversion layer 240 is directly emitted. Therefore, the backlight module 2 has good uniformity. In addition, the first arcuate structure 232 on the light source 220 and the substrate 230 can have different designs depending on the size of the different products and the requirements of different products. For example, the distance R between the light source 220 and the substrate 23A and the distance D between the adjacent two light sources 220 may vary in size and proportion depending on the product. The upper, upper, and lower light source 220 is located below the first curved surface structure 232 to help reduce the difference in thickness of the first wavelength-converting layer 24 from the light 222 of the first wavelength. Therefore, the position of the light source 220 may not be located at the center of the circular track 25〇. In other words, the light source 22〇 may be located beside or above or below the center of the circular trace 25〇. Of course, from the cross-sectional view, the first orphan plane structure 232 may also be an elliptical arc rather than an arc of fixed curvature. That is, the track of the first fox face structure 232 does not necessarily have a fixed center in the cross section of the substrate 230 with the fixed direction E as a normal. ^ Overall, 5, the design of the first curved surface structure 232 helps to improve the light uniformity of the backlight unit 200. Therefore, the backlight module of the present invention does not have the density of the light source 220, which helps to save the manufacturing cost of the backlight module and reduce the energy consumption. Further, the arrangement of the first wavelength conversion layer 240 outside the light source 22 () contributes to the improvement of the reliability of the backlight module, and the quality of the backlight module 2 is further improved. 201040629 tv /υ^υυοινιζ^ι TW 27459twf.doc/n FIG. 3 is a cross-sectional view showing a backlight module according to a second embodiment of the present invention. Referring to FIG. 3, the backlight module 300 is substantially the same as the backlight module 200, wherein the same components are denoted by the same component symbols, and are not separately described herein. Specifically, in order to improve the light utilization efficiency of the light source 220, the backlight module 300 further includes a reflective layer 310 disposed at the bottom 214 of the light box 210.

The reflective layer 310 of the present embodiment has, for example, at least one second curved face 312. In addition, each of the light sources 220 is substantially located above the corresponding one of the two arcuate structures 312. In fact, the invention is not limited thereto, and in other embodiments, the side of the reflective layer 310 remote from the bottom 214 may have a flat soil surface or a reflective structure having other shapes.

Since the first-wavelength light 222 is reflected by the reflective layer 310, the light 224 reflecting the first wavelength can be substantially advanced along the original path and incident on the first wavelength conversion layer. 240. As such, the light 224 reflecting the first wavelength at different angles is substantially the same thickness through the first wavelength conversion layer 240. The visible light 242 generated by the different regions of the first wavelength conversion layer 240 that reflect the light 224 of the first wavelength can exhibit substantially the same brightness. In other words, the backlight module 300 has a uniform light output quality. In practice, each of the second arcuate structures 312 may be elongated in a fixed direction. In other words, the arcuate structure 312 is an elongated concave-convex structure formed on the reflective layer 310 and extending in a fixed direction. In addition, the second arcuate structure 312 has at least one arc (as shown in FIG. 3) on a section of the reflective layer 310 which is normal to the fixed direction. At this time, if each light source 220 is located at the arc center of one of the corresponding arcs, the first wavelength can be more correctly reflected.

mZITW 27459twf.doc/n Light 224 is advanced in the reverse direction along the original path and is incident substantially perpendicularly on the first wavelength conversion layer 240. That is to say, the first wavelength conversion layer 240 at each position is more uniform in light emission efficiency by reflecting the light 224 of the first wavelength, so that the light-emitting effect of the backlight module 300 is more uniform. It is worth mentioning that, in the present embodiment, the configuration of the reflective layer 310 allows the light 222 of the first wavelength to be utilized more effectively, thereby further achieving energy saving effects. 4 is a cross-sectional view of a backlight module according to a third embodiment of the present invention. Referring to FIG. 4, the backlight module 400 is substantially the same as the backlight module 300. The difference is that the backlight module 400 further includes a second wavelength conversion layer 41〇, which is disposed in a second arc of the reflective layer 310. On the face structure 312. The second wavelength conversion layer 41 配置 disposed on the reflective layer 310 can convert the light 222 of the first wavelength into the visible light 412 and advance backward along the original path and be large, and vertically incident on the first wavelength conversion layer. The backlight module 4 has a longer mixing distance and higher uniformity of light output. In other words, the backlight module 400 has the characteristics of high light uniformity and high reliability. Q Looking at the above three embodiments, at least one arcuate structure (232, 312) is formed on the substrate 230 and the reflective layer 310 corresponding to the positions of the respective light sources 210 to allow the first wavelength of light 222 and the first wavelength of light 224 to be reflected. The skin length conversion layer 240 is substantially perpendicularly incident. Therefore, the light-emitting efficiency of the first wavelength conversion layer 240 in the different regions is substantially high, and the backlight modules 200 to 400 exhibit a uniform light-emitting effect, but the present invention is not limited thereto. For example, FIG. 5 is a mouth drawing of a backlight module according to a fourth embodiment of the present invention. Referring to FIG. 5, the backlight module 500 includes a light box 510, at least one light source 520, a first substrate 53A, a wavelength conversion layer, and a 13.1W 27459 twf.doc/n 201040629 first substrate 550. Light box 510 has an opening 512 and a bottom 514 opposite opening 512. The light source 520 is disposed in the light box 51A, and the light 522 of the first wavelength is emitted by the light source 520. The first substrate 53 is disposed on the opening 512 of the lamp housing 510. Further, the wavelength conversion layer 54 is disposed on one side of the first substrate 530 facing the light source 520. The second substrate 55 is located in the light box 510 and disposed between the first substrate 530 and the light source 52A. At least a portion of the light 522 of the first wavelength emitted by the light source 520 is refracted by the second substrate 550 and is incident substantially perpendicularly to the wavelength conversion layer 54 to be converted into a visible light. Specifically, the first substrate 530 is, for example, a diffusion plate, and of course, other backlight plates (4) may be other optical sheets. Further, the second substrate 55G may have at least one light guiding name 552. Herein, the light guiding structure 552 is exemplified by at least a semi-elliptical convex microstructure, wherein at least a portion of the light source 52Q emits light of a first wavelength 522 scattered at different angles, which will be directed after passing through the light guiding structure 552. The normal direction 532 of the first substrate 53 is deflected. Therefore, the first substrate 53G of the backlight module 5〇〇 does not need to have a curved surface structure or a corresponding structural design, even if the first-wavelength light 522 is substantially perpendicular to the human-wavelength conversion layer 54〇. The second substrate 550 is an optical sheet that can affect the light of the first wavelength of light 522: Therefore, the first-wavelength light 522 is subjected to the wave = degree = compensation by the second substrate 550 to give the backlight module 5 〇〇 a good light uniformity.实 In practice, each of the light sources 520 includes a light emitting diode, a cold cathode fluorescent lamp, an external electrode fluorescent tube, a hot cathode fluorescent tube or a laser diode. The wavelength conversion layer 540 may have a plurality of phosphor powders, a plurality of fill powders, or a combination thereof as described in the 14 iviZITW 27459 twf.doc/n. Light 522 of the first wavelength may be a non-visible light in this embodiment. Of course, the light 522 of the first wavelength may also be visible light, which is suitable for a substance such as phosphor powder or phosphor powder of the wavelength conversion layer 540. In addition, in order to improve the light utilization rate of the light source 520, the backlight module 5 can further include a reflective layer (not shown) disposed at the bottom 514 of the light box 510. FIG. 6 is a schematic diagram of a display device according to an embodiment of the invention. Referring to FIG. 6 , the display device 6 本 of the present embodiment includes a display panel 61 〇 and a backlight module 620 , wherein the backlight module 62 〇 can be the backlight module 200 〜 500 of the above embodiments or other A backlight module of the same technical feature of the present invention. The backlight module 62 is disposed on one side of the display panel 61, and provides a surface light source to the display panel 61, and causes the display device 6 to display the display. Actually, the panel 61 is displayed. For example, it is a non-self-luminous display panel such as a liquid crystal display panel or other semi-self-illuminating surface display panel. Of course, the display device 600 further includes a front frame 63 to firmly hold the display panel 61A and the backlight module 630. In summary, the backlight module of the present invention and the structure on the display panel cause at least a portion of the light of the first wavelength emitted by the light source to be perpendicular to the wavelength conversion layer. Therefore, the backlight module of the present invention has a good light-emitting property and the backlight module of the present invention exhibits a good appearance. In detail, the wavelength conversion layer of the present invention is disposed on the arcuate structure to enable at least a portion of the light source to emit a first-wavelength slit that is not scattered to the wavelength conversion layer, or to have a light-guided layer. _ at least part of the filament emits (four) - wavelength of 15, TW 27459twf.doc / n 201040629 The path of light is guided to the backlight module perpendicular to the wavelength viewing layer, the wavelength conversion layer is at different positions, the invention is substantially the same The surface light source of the present sentence can be provided. The current luminous efficiency optical module arranges the wavelength conversion substance f in the light source, and the reliability of the back gamma substance of the present invention makes the back mode of the present invention. The preferred embodiments are disclosed as above, and the invention is defined in the art, and is not limited to the scope of the invention, and may be used as a part of the scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial schematic view of a conventional backlight module. Fig. 2A is a schematic view showing the backlight module of the first embodiment of the present invention. σ surface

2 is a cross-sectional view showing a relationship between a light source and a substrate, and FIG. 7 is a cross-sectional view of a backlight module according to a second embodiment of the present invention. Sectional view of the backlight module of the example: 5: ή R is the scraping surface of the backlight module of the fourth embodiment of the present invention 201040629

iviZlTW 27459iwf.doc/n FIG. 6 is a schematic diagram of a display device according to an embodiment of the present invention. [Main component symbol description] 100, 200, 300, 400, 500, 620: backlight module 120: diffusion plate 130, 220, 520: light source 132: excitation light 222, 522: first wavelength light 210, 510: light box 212, 512: openings 214, 514: bottom 224: light 230 reflecting the first wavelength: substrate 232: first curved surface structure 240: first wavelength conversion layer 142, 242, 412: visible light 〇 250: circular trajectory 310 : reflective layer 312 : second curved surface structure 410 : second wavelength conversion layer 530 : first substrate 532 : normal direction 110 , 540 : wavelength conversion layer 550 : second substrate 17 27459twf.doc / n 201040629 552 : Light guiding structure 600: display device 610: display panel 630: front frame D, R: distance E: fixed direction

Claims (1)

201040629卿27459twf.doc/n VII. Patent application scope: h A backlight module, comprising: a light box having an opening and at least one light source opposite to the opening, disposed in the light box, the light source is two a light having a wavelength of a substrate disposed on the opening of the light box, the substrate having at least a first curved surface structure facing the light source; and a first wavelength conversion layer, conformally The first curved surface of the substrate is disposed on the structure, and at least a portion of the light of the first wavelength emitted by the light source is irradiated to the first wavelength conversion layer to be converted into a visible light. 2. The backlight module of claim 1, wherein the light source is a light emitting body, a cold cathode lamp, an external electrode tube, a hot cathode tube or a laser diode. 3. The backlight module of claim 2, wherein the light source is located below the first curved surface structure. 4. The backlight module of claim 1, wherein the 0th-curved surface structure and the light source respectively extend in a fixed direction. 5. The backlight module of claim 4, wherein the first curved surface structure is an arc in a section of the substrate in which the fixed direction is a normal. 6. The backlight module of claim 5, wherein the light source is located at an arc center of the arc. The backlight module of claim 4, wherein the backlight module further comprises a reflective layer, and the reflective layer has at least a second curved surface 19 27459t\vf.doc/u 201040629 structure. 8. The backlight module of claim 7, wherein the second arcuate structure is an arc of a cross section of the reflective layer with the fixed direction as a normal. 9. The backlight module of claim 8, wherein the light source is located in the arc of the circle. 10. The backlight module of claim 7, further comprising a second wavelength conversion layer conformally disposed on the second curved surface structure of the reflective layer. The backlight module of claim 1, wherein at least a portion of the light of the first wavelength emitted by the light source is an invisible light. 12. The backlight module of claim 1, wherein the first wavelength conversion layer has a plurality of phosphors, a plurality of phosphors, or the group of the above-mentioned groups. The backlight module is characterized in that the substrate is a diffusion plate. A backlight module, comprising: a light box having an opening and a bottom opposite to the opening; at least one light source disposed in the light box, the light source emitting light of a first wavelength; a first substrate, Disposed on the opening of the light box; a wavelength conversion layer disposed on the first substrate; and a second substrate disposed in the light box and disposed between the first substrate and the light source, at least A portion of the light of the first wavelength emitted by the light source is refracted by the second substrate and then vertically incident on the wavelength conversion layer to be converted into a visible light. 15. The backlight module of claim 14, wherein the light source comprises a light emitting diode, a cold cathode fluorescent tube, an external electrode tube, a hot cathode tube or a laser. Diode. The backlight module of claim 14, wherein the first wavelength of light emitted by the light source is - invisible light.背光 The backlight age of the 14th item, which is the combination of the (four) powder and the township self-county powder technology. The backlight module of claim 14, further comprising a reflective layer disposed at the bottom of the light box. 19. The first substrate of the first aspect of the invention is a diffusion plate. The display device includes: a display panel; and the backlight module and the lower panel of the panel include: a portion; and an "open" and an opposite of the opening - a bottom wavelength; cut, 'disposed in the light box, the light source emits at least two '': 2 on the opening of the light box, the substrate has a 〆! a fox surface structure facing the light source; and a structure-arc surface squeezing the first wavelength of light emitted by the source 21 201040629 iW_ to the first wavelength conversion layer to convert into a visible light. 21. The display device of claim 20, wherein the light source is a light emitting diode, a cold cathode light tube, an outer electrode light tube, a hot cathode light tube or a laser diode. 22. The display device of claim 20, wherein the light source is located below the first curved surface structure. 23. The display device of claim 20, wherein the first curved surface structures and the light sources extend in a fixed direction. 24. The display device of claim 23, wherein the first curved surface structure is a circular arc in a section of the substrate in which the fixed direction is a normal. 25. The display device of claim 24, wherein the light source is located at an arc of the arc. 26. The display device of claim 23, wherein the backlight module further comprises a reflective layer, and the reflective layer has at least a second arcuate structure. 27. The display device of claim 26, wherein the second curved surface structure is a circular arc in a section of the substrate in which the fixed direction is a normal. 28. The display device of claim 27, wherein the light source is located at an arc of the arc. 29. The display device of claim 26, wherein the backlight module further comprises a second wavelength conversion layer conformally disposed on the second curved surface structure of the reflective layer. The display device of claim 2, wherein the light of the first wavelength emitted by the light source is an invisible light, as shown in the second aspect of the invention. One to 31. As shown in the second paragraph of the patent application scope, the wavelength conversion layer has a plurality of (four) light powders, a plurality of phosphor powders or a combination of: 32. The display substrate as described in claim 2 is a diffusion plate. The display device, wherein the display device comprises: a display panel; and a moonlight stack, located below the display panel, the backlight module comprising a light box having an opening and a bottom opposite the opening At least one light source disposed in the light box, the light source emitting light of a wavelength; a first substrate disposed on the opening of the light box; a wavelength conversion layer disposed on the first substrate; and a second a substrate disposed in the light box and disposed between the first substrate and the light source, wherein at least a portion of the first wavelength light emitted by the light source is refracted by the second substrate and then vertically incident on the wavelength conversion layer Become a visible light. The display device of claim 33, wherein the light source comprises a light emitting diode, a cold cathode light tube, an external electrode tube, a hot cathode tube or a laser diode body. The display device of claim 33, wherein at least a portion of the light of the first wavelength emitted by the light source is an invisible light. The display device of claim 33, wherein the wavelength conversion layer has a plurality of phosphors, a plurality of phosphors, or a combination thereof. The display device of claim 33, wherein the backlight module further comprises a reflective layer disposed at the bottom of the light box. 38. The display device of claim 33, wherein the first substrate is a diffusion plate.