KR200429443Y1 - Brightness enhancement structure of side-type LCD backlight module - Google Patents

Abstract

The present invention relates to a light emitting structure having an improved brightness of a side type backlight module applicable to a liquid crystal display device. The light emitting structure is a partially open tube-shaped structure, the first visible light coated on an inner circumference. An optical screen having a layer; A light cover substantially extending from one side of the optical screen and bent inward with respect to the first visible light layer; A bar-shaped tube each capable of emitting blue / ultraviolet light, comprising at least one light emitting source wrapped in a concave portion of the light cover, whereby most of the visible light is not blocked by the light emitting source Not only the brightness can be reflected and emitted from the improved light emitting structure, but also the visible light generated by the excitation of the fluorescence / phosphorescence of the visible light layer is also not reflected by the visible light layer and reflected from the light emitting structure with improved brightness. Can be released.

Backlight module, visible light layer, light cover, light screen

Description

Brightness enhancement structure of side-type LCD backlight module

1 is a view showing a conventional backlight module.

FIG. 2 shows an ultraviolet emitting backlight module disclosed in US Pat. No. 5,739,879 entitled "Backlighting device for liquid crystal displays."

3 shows a backlight module disclosed in Taiwan Patent No. 94120669.

4 is a view showing a light emission structure with improved brightness according to a preferred embodiment of the present invention.

FIG. 5 is a view schematically showing a light emission structure of which the brightness of the present invention is enhanced by a specific angle formed by a light-exiting part of 90 degrees and connected to a light guide plate; FIG.

FIG. 5A is a schematic representation of a light enhanced light emitting structure similar to FIG. 5 with the ultraviolet absorbing layer replaced by a biconvex cylindrical lens; FIG.

FIG. 6 is a schematic representation of a light enhanced light emitting structure similar to FIG. 5 with a specific angle formed by the light exit at 90 degrees; FIG.

7 to 9 are configured similarly to FIG. 6, but showing an improved light emitting structure in which the arrangement of the light emitting sources is different.

10 to 15 are shown similarly to Figure 4 but showing an improved light emission structure having a different shape of the optical screen.

FIG. 16 is a view showing a modification of the light emission structure with improved brightness of FIG. 15. FIG.

FIG. 17 is a view showing a modification of the light emission structure with improved brightness of FIG. 16. FIG.

FIG. 18 is a view showing another modified example of the light emission structure with improved brightness of FIG. 16. FIG.

FIG. 19 is a schematic illustration of a light enhanced light emitting structure having two light emitting sources arranged symmetrically with respect to the light guide plate; FIG.

20 is a view showing a modified example of the light emission structure with improved brightness of FIG.

FIG. 21 is a view showing a modification of the light emission structure with improved brightness of FIG. 20. FIG.

The present invention relates to a structure of improved brightness of the side type backlight module applied to the liquid crystal display device, and more specifically, visible light emitted by the excitation method (excited) from the surface of the fluorescent / phosphorescent coating of the visible light layer in a reflective manner, When entering the light guide plate, not only the light utilization efficiency and the light intensity are greatly improved, but also to a brightness improving structure that can be applied to any light emitting assembly and device.

In general, the brightness of a conventional light emitting device such as a fluorescent lamp, regardless of whether it is used as a light emitting device of a luminaire, display board, alarm device or any other electronic device, It depends on the light utilization efficiency of the light source used thereby. Since most of the energy consumed is converted into usable light rather than heat, the fluorescent lamp can be used more efficiently than incandescent bulbs with the same brightness and also cooler. Such fluorescent lamps are used. The fluorescent lamp consists of a glass tube filled with an inert gas and mercury vapor, and the inner surface of the glass tube is coated with fluorescent paint made by modifying a mixture of fluorescent substances. When the lamp is turned on, electric power heats the cathode of the fluorescent lamp to emit electrons, and these electrons collide with the inert gas in the glass tube to form a plasma by a collision ionization process that ionizes the inert gas. As a result of this chain ionization process, the conductivity of the ionized gas rapidly increases, allowing a higher current to flow through the lamp, and then mercury ionizes in the same way to emit light in the ultraviolet region. This ultraviolet light is absorbed by the fluorescent coating to emit visible light by radiating again low frequency energy. The mixture of phosphors controls the color of the light and also prevents harmful ultraviolet radiation from escaping together with the glass of the glass tube. However, the aforementioned fluorescent lamps have the following disadvantages:

(1) The fluorescent coating is a fluorescent film having a constant thickness, the surface of the fluorescent film can be easily excited by ultraviolet light to emit visible light, the intensity is reduced when the ultraviolet light penetrates deep into the fluorescent film, The visible light generated deep in the fluorescent film is less than the visible light generated on the surface of the fluorescent coating, as a result, the fluorescent coating emits most of the light from the surface and a small amount of light from the inside of the light emitting device Can be considered as.

(2) The fluorescent coating is not a good translucent material, and the luminance of visible light generated at its surface is weakened when visible light passes through the fluorescent coating and exits the glass tube. That is, the brightness of the visible light is adversely affected by the fluorescent coating.

Referring to FIG. 1, which shows a conventional LCD backlight module, the conventional backlight module 1 includes a panel 11, a diffuser plate 12, a light guide plate 13, a reflective sheet 14, and the And a light source 15 arranged on the side or bottom of the light guide plate 13. In FIG. 1, the backlight module 1 is substantially a side type backlight module because the light source 15 is arranged on the side of the light guide plate 13, and the semicircular light screen 16 is light guided. It is arranged on the side of the light source 15 so as to face the side of the plate 13 so as to reflect the light emitted from the light source 15 to be directed back toward the light guide plate 13. As soon as the light of the light source 15 is reflected by the light screen 16 and enters the light guide plate 13, it is reflected and diffused by the reflecting sheet 14 and the diffuser plate 12 to the light of the panel 11. Ensure a uniform distribution of light intensity over the entire surface. Although the brightness enhancement of the light source 15 may improve the brightness and uniform distribution of the panel 11, the light source 15 having such enhanced brightness generates more heat, thereby causing heat dissipation problems. Should be considered. Thus, the design of the optical screen 16 is a major factor affecting the brightness of the backlight module 1. If the light screen 16 does not reflect the light of the light source 15 sufficiently and does not direct the reflected light back into the light guide plate 13, all the light emitted from the light source 15 is By not entering the light guide plate 13 to be reflected and diffused by the reflecting sheet 14 and the diffuser plate 12, the brightness of the backlight module is adversely affected. However, most improvements to the backlight module include the use of the diffuser plate, the light guide plate and the reflective sheet, such as the use of a light emitting diode as a light source, the design of a wedge shaped light guide plate or the placement of microstructures on the diffuser plate. The focus is on redesigning the structure or improving the brightness of the light source, and there is little information on the improvement of the optical screen. As in the structure shown in FIG. 1, a portion of the light reflected by the light screen 16 is blocked by the light source 15 itself so that it cannot enter the light guide plate 13, thereby leaving the light source 15 from the light source 15. Since all emitted light cannot enter the light guide plate 13, the light utilization efficiency of the light source 15 is lowered.

Referring to FIG. 3 showing an ultraviolet emitting backlight module disclosed in US Pat. No. 5,739,879 entitled “Backlighting device for liquid crystal displays”, the backlight module of FIG. An ultraviolet lamp 66 having an ultraviolet transmitting quartz envelope for emitting and delivering 63; (b) a light guide portion (60) disposed in front of the ultraviolet lamp (66) to allow visible light to pass therethrough, the light guide portion (60) having a front side and a rear side and a proximal edge surface; (c) a lamp holder (67) having an ultraviolet reflecting inner surface (64) surrounding the ultraviolet lamp (66) in cooperation with the proximal edge surface of the light guide portion (60); (d) a fluorescent layer 65 positioned between the quartz envelope of the ultraviolet lamp 66 and the proximal edge surface of the light guide portion 60 to convert the ultraviolet light 63 into visible light 62.

Advantages of the above-described back light module include: Because the fluorescent layer 65 is located only between the quartz envelope of the ultraviolet lamp 66 and the proximal edge surface of the light guide 60, the ultraviolet 63 is only Only when entering the light guide portion 60 can move through the fluorescent layer 65, so that the visible light 62 does not pass any fluorescent layer 65, so that almost all of the visible light is fluorescent layer 65 Can be achieved by the fact that it is not absorbed by). However, the above-described backlight module also has the following disadvantages: Although the visible light 62 is not absorbed by the fluorescent layer 65, the structure of the lamp holder 67 is reflected thereby to reflect the light. It has not been improved to improve the amount of ultraviolet light directed towards the guide 60, and also before most of the visible light 62 excited from the surface of the fluorescent layer 65 is emitted from the surface. Filtered by (65), and the intensity of the ultraviolet (63) decreases as the ultraviolet (63) penetrates deep into the fluorescent layer (65), so that the fluorescent layer (65) is not made of a good translucent material. In addition, the brightness of the fluorescent layer 65 is influenced by the visible light 62 generated from the inside of the fluorescent layer 65, resulting in poor light utilization efficiency.

In addition to the above-mentioned ultraviolet lamps, light emitting diodes which are compact, robust, energy-saving, generate less heat than incandescent bulbs that emit light of the same brightness, and also have a long lifetime with high reliability Is commonly used for illumination. Referring to FIG. 3 showing the backlight module disclosed in Taiwan Patent No. 94120669, the backlight module 40 includes a light guide plate having a fluorescent layer 16 coated on a light exiting surface 24. 12); Substantially, the LED device 14, which is a case 30 surrounding the LED chip 28 and epoxy 32; And a light screen 18 disposed on the side of the LED device to face adjacent to the light guide plate 12. With this configuration, when the light L _EX emitted from the LED device 14 is directed to enter the substrate 22 of the light guide plate 12 from the light inlet 20, the light L _EX . A portion of is absorbed by the fluorescent layer 16 so that light L _PHO is excited by mixing with the remaining light L _EX without being absorbed by the fluorescent layer 16. Then, the mixed light of the L _PHO and the remaining L _EX represented by the light L _WH is emitted from the light exit surface 24. The backlight module is difficult to coat a phosphor layer on the surface of the LED, thereby freeing the problem that occurs in other conventional backlight module, which causes the backlight module to have a bad lighting effect. However, in the above-described backlight module, although the fluorescent layer may be coated on the light exit surface 24 or the reflective surface 26 or doped to the substrate 22, the light guide plate 16 is already present. By being able to react only to the light L _EX , it encounters the problem of unsatisfactory light utilization efficiency such as the backlight module disclosed in US Pat. No. 5,739,879.

In short, the main reason in the conventional backlight module having such unsatisfactory light utilization efficiency is that the light emitted from the light source cannot be directed completely into the light guide plate, so that the fluorescent layer is a good translucent material. Along with the problem that it is not made, the optical utilization efficiency is not satisfied by filtering by the fluorescent layer before most of the visible light excited from the surface of the fluorescent layer is emitted.

In view of overcoming the above disadvantages, the main object of the present invention is applicable to the liquid crystal display device, can emit visible light, mainly by the reflection method from the surface of the fluorescent / phosphorescent coating of the visible light layer Excitation, to provide a light emitting structure with improved brightness of the side-type backlight module, which can greatly improve the light utilization efficiency as well as the intensity of light when light enters the light guide plate.

In order to achieve the above object, the present invention is a light emitting structure having improved brightness of the side-type backlight module that can be applied to the liquid crystal display device, a partially open tube-like structure, the first visible light layer coated on the inner circumference An optical screen having; A light cover substantially extending from one side of the optical screen and having an optical reflection layer bent inward with respect to the first visible light layer and formed on an inner circumference; A bar-shaped tube or light emitting diode, each capable of emitting blue light / ultraviolet light, comprising a light emitting source wrapped in a concave portion of the light cover.

Further, in a preferred aspect, in order to achieve the above-described object, the present invention is a light emitting structure of improved brightness of the side type backlight module applicable to the liquid crystal display device, a partially open tube-like structure, the inner peripheral image An optical screen having a first visible light layer coated on it; One is substantially an extension of one side of the optical screen and bent inward with respect to the first visible light layer, and the other is substantially an extension of the other side of the optical screen and inward with respect to the first visible light layer. Two light covers which are bent and have a light reflecting layer formed on the inner circumference; A bar-shaped tube or light emitting diode, each capable of emitting blue / ultraviolet light, comprising at least one light emitting source wrapped in a concave portion of the corresponding light cover.

In a preferred aspect, the area enclosed by the light cover and the light screen can be irradiated by blue light / ultraviolet light of at least one or more light emitting sources and filled and sealed with an inert gas. Filling and sealing of such inert gases are known in the art and are similar to conventional light tubes and detailed descriptions thereof are omitted.

Other aspects and advantages of the present invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings, which serve to explain the principles of the present invention.

Example

Some preferred embodiments are provided as follows in order to provide a thorough understanding and appreciation of the complete functionality and structural features of the present invention.

Referring to FIG. 4, which shows an improved light emitting structure in accordance with a preferred embodiment of the present invention, the improved light emitting structure 2 for the side type backlight module is a partially open tube-shaped structure. An optical screen 3 having a visible light layer 6 coated on it; A light cover (4) having substantially a light reflecting layer (21) formed on an inner circumference of the visible light layer (6), extending substantially on one side of said light screen (3); A bar-shaped tube capable of emitting blue / ultraviolet light, comprising a light-emitting source 5 enclosed within the recess of the light cover 4. Note that the light screen 3, the light cover 4 and the light emission source 5 are all tubular in shape, after which they are preferably indicated by their cross section as shown in FIG.

In Fig. 4, the cross sections of the light screen 3 and the light cover 4 are each defined by arc corves. Moreover, the visible light layer 6 is a layer selected from the group consisting of a fluorescent coating, a phosphorescent coating and a light reflecting layer having an inner surface coated with at least one of the coatings. In a preferred aspect, the visible light layer 6 is an array of visible light excitation spots that can be used to adjust the color temperature of the substantially emitted light, whereby multiple visible light excitation spots. The yellow light can be mixed with the blue light emitted from the light emitting source 5 while controlling the amount of yellow light excited from it. When the invisible light of the light emitting source 5 shines on the visible light layer 6, the visible light 52 is formed as a gap between the side wall of the light cover 4 and the side wall of the light screen 3. It is excited and discharged therefrom by exiting the light screen 3 via a light-exiting part 7. It is known that the luminous efficiency of a flawless reflective fluorescent appratus to visible or ultraviolet light is better than in conventional fluorescent devices where it is required to pass through the fluorescent layer before the excited visible light is emitted. Thus, the visible light 52 is excited from the surface of the visible light layer 6 and is not filtered by the visible light layer 6 before being discharged, thereby improving the light utilization efficiency and improving the brightness. The brightness of the side type backlight module using the light emitting structure 2 is improved.

Referring to FIG. 5 schematically illustrating a light emission structure of the present invention, in which a specific angle θ ₁ formed by the light exit portion is 90 degrees and connected to a light guide plate, schematically illustrated in FIG. 5. As described above, the light exit portion 7 is connected to the light guide plate 8, and the light guide plate is adjacent to the light exit surface 83, the reflective surface 82, and the light exit portion 7. A proximal edge 81 and a remote edge 84 opposite the proximal edge 81 of the light guide plate 7 are included. Furthermore, a clipping apparatus 31, 41 is arranged at the proximal edge 81 of the light guide plate 8 adjacent the light exit 7 to the light screen 3 and the light cover 4. By being connected, it is used to fix the proximal edge 81 of the light guide plate 8 on the outlet 7. In addition, an ultraviolet absorbing layer 9 is arranged at a constant position between the exit of the light outlet 7 and the proximal edge 81 of the light guide plate 8, wherein the ultraviolet absorbing layer 9 is a transparent TiO _2. And a layer selected from the group consisting of a coating part, a transparent ITO coating part, a bar-shaped transparent glass plate capable of preventing the transmission of ultraviolet rays, a bar-shaped glass block, and a combination thereof. It is very important to arrange the ultraviolet absorbing layer 9 in the above-mentioned position so as to absorb residual ultraviolet rays and transmit the emitted visible light to prevent damage by ultraviolet rays. In addition, most of the light guide plate 8 is formed of a resin, which is illuminated by ultraviolet rays for a predetermined time and yellowish discoloration, and the arrangement of the ultraviolet absorbing layer 9 is such light. The guide plate 8 is prevented from tingling. However, if the light guide plate 8 is formed of glass, the arrangement of the ultraviolet absorbing layer 9 is unnecessary.

The function of the ultraviolet absorbing layer 9 may be replaced by a biconvex cylindrical lens 91, as in the embodiment shown in FIG. 5A, and the biconvex cylindrical lens of the ultraviolet absorbing layer 9 The replacement with 91 is to direct more reflected visible light 52 into the light guide plate 8. Since the other parts of FIG. 5A are similar to the parts of FIG. 5, further description thereof is omitted.

Referring to FIG. 6 schematically showing a light emitting structure having a brightness similar to that of FIG. 5 having a specific angle formed by the light exit portion of 90 degrees, as shown in FIG. The light emitting structure with improved brightness includes a light cover (3) having a light screen (3), a light reflecting layer (21) formed therein, and a light emitting source (5), wherein the light screen (3) On the inner circumference, a visible light layer 6 is coated, while at a certain position between the light screen 3 and the light cover 4, the light exit portion 7 is formed by sidewalls of the two members. The light exit portion 7 includes a light exit surface 83, a reflection surface 82, a near edge portion 81 adjacent to the light exit portion 7, and a near edge portion of the light guide plate 7. It is connected to a light guide plate 8 comprising a remote edge portion 84 opposite the 81. Furthermore, a clipping apparatus 31, 41 is arranged at the proximal edge 81 of the light guide plate 8 adjacent the light exit 7 to the light screen 3 and the light cover 4. By being connected, it is used to fix the proximal edge 81 of the light guide plate 8 on the outlet 7. In addition, an ultraviolet absorbing layer 19 is arranged at a constant position between the exit of the light outlet 7 and the proximal edge 81 of the light guide plate 8. All parts of FIG. 6 are similar to those shown in FIG. 5, and thus, further description thereof is omitted. The difference between the light emitting structures with improved brightness of FIGS. 5 and 6 is that the specific angle θ ₂ formed by the light exit portion 7 is not 90 degrees, whereas the specific angle θ ₁ of FIG. 5 is 90 degrees. It is a degree. In order to conform to the specific angle θ ₂ , the ultraviolet absorption layer 19 is formed in a trapezoidal shape. In addition, two surfaces of the fixing devices 31 and 41 facing toward the light guide plate 8 are coated by two visible light layers 311 and 411, each having a light reflecting ability. In the embodiment of Fig. 6, the arrangement of the light guide plate with the arrangement of the light guide plate is emphasized that the arrangement of the light emitting structure with improved brightness can be changed according to actual requirements. For example, the light exit surface 83 of the light guide plate 8 may be arranged not perpendicular to the light exit 7. The light guide plate 8 may be formed in a rectangular or wedge shape, which is already known to those skilled in the art, and will not be described herein.

Referring to FIGS. 7 to 9, which are similar to the light emitting structure of FIG. 6 but having improved brightness with different arrangements of light emitting sources, the structures shown in FIGS. 7 to 9 are based on the structure shown in FIG. 6. 6 having the same parts as those in FIG. 6, and only the difference between these structures and the structure of FIG. In FIG. 7, unlike the single light emitting source of FIG. 6, two light emitting sources 5a and 5b arranged in parallel are stored in a state surrounded by the light cover 4. Ultraviolet rays from the emission sources 5a and 5b can be irradiated directly on the visible light layer 6. In FIG. 8, unlike two light emitting sources 5a and 5b arranged in parallel, two light emitting sources 5c and 5d arranged in succession are housed in a state surrounded by a light cover 4, Only ultraviolet rays of the light emission source 5c can be irradiated directly on the visible light layer 6. In Fig. 9, unlike a light emitting source configured as a bar-shaped tube, a light emitting diode (LED) 5e is used. In the case where the light emitting diode 5e of FIG. 9 is a blue LED, the arrangement of the ultraviolet absorbing layer 19 of FIG. 6 is not required, and the proximal edge portion 81 of the light guide plate 8 is the light exit portion 7. ) And the visible light layer 6 may be a coating formed of a fluorescent material that may be excited to emit yellow light, whereby the light emitting structure of FIG. Note that white light can be emitted by mixing the blue light of the LED 5e with the excited yellow light. From the above description, it can be seen that a variety of light emitting devices that can be applied as the light emitting source of the present invention. For example, the LED 5e may be a lead type LED or a surface mounted LED, and the light emitting source may also be an array of light emitting devices received in the light cover 4, where the above The appearance of the light cover 4 changes depending on the number and type of light emitting devices.

Referring to FIGS. 10 to 15, which are similar to the light emitting structure of FIG. 4 but showing an improved light emitting structure having a different shape of the light screen, the structures shown in FIGS. 10 to 15 are based on the structure shown in FIG. 4. 4, which have the same parts as in FIG. 4, only the differences between these structures and the structure of FIG. The difference between the light enhanced light emitting structures 2a to 2f is that they have different shaped optical screens. That is, the cross-sectional contours of the optical screens 3a to 3f are not equal to each other, so that the cross-sections of the optical screens 3a are formed into parabolic curves bent inwardly; The optical screen 3b is formed in a parabolic curve extending outward; The optical screens 3c to 3e are each formed in a triangular, square and trapezoidal shape; The optical screen 3f is formed by a combination of curves and straight lines. Thus, the cross-sectional contour of the optical screen of the present invention is formed by a function selected from the group consisting of geometric curve functions, polygonal functions and combinations thereof. In addition, the light emitting sources used in the embodiments shown in FIGS. 10 to 15 may use those shown in FIGS. 7 to 9, and the optical screen used in FIGS. 7 to 9 may also be used in FIGS. 10 to 15. . Moreover, the cross-sectional contour of the light cover 4 of the present invention is also formed by a function selected from the group consisting of geometric curve function, polygonal function and combinations thereof.

Referring to FIG. 16, which is a variation of the light emitting structure of FIG. 15 having improved brightness, as shown in FIG. 5, the light emitting structure 20 having improved brightness for the side type backlight module may include an optical screen 30. And a light cover 40 and a light emitting source 50, wherein a visible light layer 60 is coated on the inner circumference of the light screen 30, while the light screen 30 and the light cover 40 are coated. At a certain position between the light exit portions 70 is formed by the side walls of the two members, which are also connected to the light guide plate. The difference between the light emitting structure 20 with improved brightness and the structure of FIG. 5 is that the visible light reflecting layer 61 is arranged at a constant position between the light emitting source 50 and the light cover 40, while the visible light reflecting layer 61 is located. ) Is substantially an extension of the visible light layer 60. Similarly, the visible light reflecting layer 61 is a layer selected from the group consisting of a fluorescent coating, a phosphorescent coating and a light reflecting layer having an inner surface coated with at least one of the coatings. Referring to FIG. 17, which is a variation of the light emitting structure with improved brightness of FIG. 16, as shown in FIG. 16, the light emitting structure 120 with improved brightness for the side type backlight module includes an optical screen 130. And a light cover 140 and a light emitting source 150, wherein a visible light layer 160 is coated on an inner circumference of the light screen 130, while the light screen 130 and the light cover 140 are coated. The light exit portion 170 is formed by sidewalls of the two members at a predetermined position between the two members. The difference between the brightness enhanced light emitting structure 120 and the structure of FIG. 16 is as follows:

(1) The visible light layer 160 is a layer selected from the group consisting of a fluorescent coating, a phosphorescent coating and a light reflecting layer having an inner surface coated with at least one of the coatings.

(2) composed of a plurality of light reflecting sheets 191, arranged at the light exit section 170, and used to receive light from the visible light layer 160 while reflecting light from the light emitting source 150 A shutter is provided. The two adjacent gaps of the plurality of light reflecting sheets 191 in the shutter are formed differently in a manner that becomes smaller as it approaches the light emitting source 150 and becomes larger as it moves away from the light emitting source 150. do. Since the number of the light reflecting sheets 191 arranged in the region adjacent to the light emitting source 150 is greater than the number of the light reflecting sheets 191 arranged in the region far from the light emitting source 150, the light emitting source ( More reflected light emitted from an area adjacent to 150 is blocked, and less reflected light emitted from an area farther from the light emission source 150 is blocked, so that the reflected visible light is uniformly emitted from the light exit 170. Can be discharged.

(3) The lens 200 is provided at a predetermined position of the light passage that moves between the light exit portion 170 and the light emission source 150. In a preferred aspect, the lens is a device selected from the group consisting of biconvex cylindrical lenses, plano-convex lenses, lenses with multiple pedestals, and combinations thereof. The function of the lens 200 is to focus the blue light / ultraviolet light emitted from the light emission source 150 so that the invisible light uniformly shines the visible light layer 160.

In addition, the ultraviolet absorbing layer 190 is arranged at a predetermined position of the exit of the light exit section 170, and is also connected to the light guide plate, this light ultraviolet layer 190 functions similarly as shown in Figs. Since the description is not made anymore. As in the embodiment of FIG. 5, when the light emitted from the light emission source 150 of FIG. 17 is ultraviolet light, the lens 200 may be arranged inside the light outlet 170 and may transmit ultraviolet light. It should be formed of quartz material.

Referring to FIG. 18, which is a variation of the light emitting structure with improved brightness of FIG. 16, as shown in FIG. 16, the light emitting structure 220 with improved brightness for the side-type backlight module includes a light screen 230. And a light cover 240 and a light emission source 250 having a light reflection layer 251 formed therein, wherein the visible light layer 260 is coated on the inner circumference of the light screen 230, while the light At a certain position between the screen 230 and the light cover 240, the light exit portion 270 is constituted by sidewalls of the two members, and the light exit portion 270 is also a light guide plate 280. ). Thereby, most of the light excited by the visible light layer 260 and reflected by the light screen 230 is sufficiently directed to enter the light guide plate 280, whereby the light entering the light guide plate 280 is Not blocked by the light emitter 250, the excited visible light is reflected to enter the light guide plate 280 without being filtered by the visible light layer.

Referring to FIG. 19 schematically illustrating a light enhanced light emitting structure having two light emitting sources symmetrically arranged with respect to a light guide plate, the light enhanced light emitting structure 320 for the side type backlight module is shown in FIG. Two optical covers 340 having an optical screen 330, a light reflection layer 351 arranged symmetrically with respect to the optical screen 330, and having a light reflection layer 351 formed therein, and a corresponding optical cover 340, respectively. 2 includes a light emitting source 350 enclosed in a state surrounded by a light source, wherein a visible light layer 360 is coated on an inner circumference of the light screen 330, while the light screen 330 and the light are coated. The light exit portion 370 is constituted by the side walls of the two members at a predetermined position between the covers 340; An ultraviolet absorbing layer 390 is arranged at the exit of the light exit portion 370, which is also connected to the light guide plate 280. Likewise, two light emitting sources can be applied by the embodiment shown in FIGS. 5A, 6-9, and the optical screen used in FIGS. 10-17 can also be applied.

Referring to FIG. 20, which shows a variation of the light emitting structure of FIG. 17 having improved brightness, the light emitting structure 420 having improved brightness for the side type backlight module includes an optical screen 430 having a light exit portion 470. ), A light cover 440 having a light reflecting layer 421 formed therein, and a light emitting source 450, wherein the light exit portion 470 is formed using fixing devices 431 and 441. The light guide plate 8, which is also connected to the light guide plate 8 and formed of quartz material, has a light exit surface 83, a reflecting surface 82, and a proximal edge adjacent to the light exit surface 83. A portion 81 and a remote edge portion 84 opposite the adjacent edge portion 81 of the light guide plate 8 are also included. In addition, a light reflecting shield 480 is arranged to surround the remote edge portion 84 and the reflecting surface 82 opposite the proximal edge portion 81 of the light guide plate 8, as shown in FIG. 17. Similar to the distribution of visible light excitation spot 461, the closer to the light emission source 450, the smaller area is covered by the visible light excitation spot 461, the larger the distance from the light emission source 450 is. A region is covered by the visible light excitation spot 461 in order to interpose a plurality of visible light excitation spots 461 between the reflecting surface 82 and the light reflecting shield 480. That is, the density of the visible light excitation spot 461 or the area of each visible light excitation spot 461 increases as it is distributed away from the light emission source 450. Thus, the reflected visible light can be evenly emitted from the light exit surface 83.

Referring to FIG. 21, which shows a variation of the light emitting structure of FIG. 20 with improved brightness, similar to the light emitting structure shown in FIG. 20, the light emitting structure 520 with enhanced brightness for the side type backlight module may have a light exit. An optical screen 530 having a portion 570, a light cover 540, and at least one light emitting source 550 capable of emitting blue light or ultraviolet light, wherein the light exit portion 570 Is further connected to the light guide plate 8 using the fixing devices 531, 541, and the light guide plate 8 having the ultraviolet absorbing layer 522 covering the top has a light exit surface 83 arranged thereon. ), A reflecting surface 82 arranged below, a proximal edge portion 81 adjacent to the light exit portion 570, and a remote edge facing the proximal edge portion 81 of the light guide plate 8. It also includes a portion 84. Further, a light reflecting shield 580 is arranged to surround the remote edge portion 84 and the reflecting surface 82 opposite the proximal edge portion 81 of the light guide plate 8, so that the reflecting surface 82 is provided. And a plurality of visible light excitation spots 561 between the light reflecting shield 580. All of the above-described parts of FIG. 21 are similar to those shown in FIG. 20, and thus description thereof is omitted. The difference between the embodiment of FIG. 21 and the embodiment of FIG. 20 is that the at least one light emitting source 550 of FIG. 21 is a blue LED, and the included angle θ ₃ is the central axis 551 of the LED 550. It is formed between the normals of the reflecting surface 82. Due to the shape of the included angle θ ₃ , the light of the LED 550 enters the light guide plate in an inclined form. Therefore, the distribution state of the inclined incident light and the plurality of visible light excitation spots cooperate with each other, thereby making it possible to achieve overall reflection while allowing the visible light to be emitted more uniformly. Moreover, the tube-shaped light emitter 450 of FIG. 20 can be exchanged and replaced by the LED 550 of FIG. 21 and vice versa. That is, the LED 550 of FIG. 21 may be received surrounded by the optical screen 430 of FIG. 20, and the light emission source 450 of FIG. 21 may be deflected to the optical screen 530 of FIG. 21. Can be.

In a preferred aspect, the area enclosed by the light cover and the light screen can be irradiated by blue light / ultraviolet light of at least one or more light emitting sources and filled and sealed with an inert gas. Filling and sealing of such inert gases are known in the art and are similar to conventional light tubes and detailed descriptions thereof are omitted.

As described above, the present invention emits visible light mainly excited from the surface of the fluorescent / phosphorescent coating of the visible light layer in a reflective manner, thereby improving the intensity and light utilization efficiency of light when entering the light guide plate. The present invention provides a backlight module that can be greatly improved and can be applied to any light emitting assembly and device.

Preferred embodiments of the present invention are for the purpose of explanation, and variations of other embodiments as well as the described embodiments of the present invention are possible by those skilled in the art. Accordingly, the appended claims are intended to cover all embodiments without departing from the spirit and scope of the present invention.

Claims (86)

A light emitting structure with improved brightness of a side type backlight module applicable to a liquid crystal display device, An optical screen having a partially open tubular structure having a first visible light layer coated on an inner circumference; A light cover substantially extending from one side of the optical screen and bent inward with respect to the first visible light layer; And a bar-shaped tube each capable of emitting blue light / ultraviolet light, the light emitting structure including at least one light emitting source wrapped in a concave portion of the light cover. The light emitting structure of claim 1, wherein the cross-sectional contour of the optical screen is formed by a function selected from the group consisting of geometric curve functions, polygonal functions, and combinations thereof. 2. The light emitting structure of claim 1, wherein the cross-sectional contour of the light cover is formed by a function selected from the group consisting of geometric curve functions, polygonal functions, and combinations thereof. The light emitting structure of claim 1, wherein the visible light layer is a layer selected from a group consisting of a fluorescent coating, a phosphorescent coating, and a light reflection layer having an inner surface coated with at least one of the coatings. 2. The light emitting structure of claim 1, wherein the visible light layer is broadly arranged on an inner wall of the optical screen to face toward the light emitting source. The light emitting structure of claim 1, wherein when the light emitting source emits blue light, the visible light layer is designed as an array of a plurality of visible light excitation spots. 7. The method of claim 6, wherein the closer to the light emission source, the smaller the area of the inner wall covered by the visible light excitation spot, and the farther away from the light emission source, the area of the inner wall covered by the visible light excitation spot Light emission structure with improved brightness, characterized in that larger. 7. The brightness of claim 6 wherein each of the plurality of visible light excitation spots is a spot selected from the group consisting of a fluorescent coating, a phosphorescent coating and a light reflecting layer having an inner surface coated with at least one of the coatings. Improved light emission structure. The light emitting structure of claim 1, wherein the surface of the light cover is composed of a light reflecting layer, or the light reflecting layer is formed on the surface of the light cover. 2. The light emitting device of claim 1, further comprising a light outlet configured by sidewalls of the two members at a predetermined position between the light screen 230 and the light cover 240, the outlet having an ultraviolet absorbing layer arranged thereon. The light emission structure with improved brightness. The method of claim 10, wherein the ultraviolet light absorbing layer is from the group consisting of a transparent TiO ₂ coating, a transparent ITO coating, a bar-shaped transparent glass plate capable of preventing the transmission of ultraviolet light, a bar-shaped glass block and combinations thereof Light enhanced light emitting structure, characterized in that the selected layer. 11. The light emitting structure of claim 10, wherein the ultraviolet light absorbing layer further comprises at least one lens arranged at an outlet of the light exit portion. 11. The light emitting structure of claim 10, further comprising a shutter composed of a plurality of light reflecting sheets and arranged in the light exit portion. The method of claim 13, wherein the two adjacent gaps of the plurality of light reflecting sheets in the shutter are formed differently in such a manner that they become smaller as they approach the light emitting source, and become larger as they move away from the light emitting source. Light emission structure with improved brightness. 11. The light emission structure of claim 10, wherein a light guide plate having a light exit surface, a reflection surface, and a near edge portion adjacent to the light exit portion is disposed at the light exit portion. 16. The light emitting structure of claim 15, wherein the light guide plate is selected from the group consisting of a rectangular light guide plate and a wedge-shaped light guide plate. 16. The light emission structure of claim 15, wherein the light exit surface of the light guide plate is arranged not perpendicular to the light exit portion. A light emitting device according to claim 15, wherein a clipping apparatus is arranged in the proximal edge portion of the light guide plate adjacent to the light exit portion and connected to the light screen and the light cover. An improved light emission structure, characterized in that fixed to the image. 19. The light emitting structure of claim 18, wherein a visible light layer is formed on the surface of the fixing device so as to face toward the light guide plate. 20. The light emission structure of claim 19, wherein the visible light layer is a layer selected from the group consisting of a fluorescent coating, a phosphorescent coating, and a light reflecting layer having an inner surface coated with at least one of the coatings. The light emitting structure of claim 1, further comprising at least one lens arranged at a predetermined position of a light path that moves between the light exit portion and the light emission source. A light emitting structure with improved brightness of a side type backlight module applicable to a liquid crystal display device, An optical screen having a partially open tubular structure having a first visible light layer coated on an inner circumference; One is substantially an extension of one side of the optical screen and bent inward with respect to the first visible light layer, and the other is substantially an extension of the other side of the optical screen and inward with respect to the first visible light layer. Two optical covers that are bent; And a bar-shaped tube each capable of emitting blue light / ultraviolet light, the light-emitting structure comprising at least one light emitting source wrapped in a concave portion of the corresponding light cover. 23. The light emitting structure of claim 22, wherein the cross-sectional contour of the optical screen is formed by a function selected from the group consisting of geometric curve functions, polygonal functions, and combinations thereof. 23. The light emitting structure of claim 22, wherein the cross-sectional contour of any one of the two light covers is formed by a function selected from the group consisting of geometric curve functions, polygonal functions, and combinations thereof. 23. The light emission structure of claim 22, wherein the visible light layer is a layer selected from the group consisting of a fluorescent coating, a phosphorescent coating, and a light reflecting layer having an inner surface coated with at least one of the coatings. 23. The light emitting structure of claim 22, wherein the visible light layer is broadly arranged on an inner wall of the optical screen to face toward the light emitting source. 23. The light emitting structure of claim 22, wherein when the light emitting source emits blue light, the visible light layer is designed as an array of a plurality of visible light excitation spots. 28. The method of claim 27, wherein the closer to the light emission source, the smaller the area of the inner wall covered by the visible light excitation spot, and the farther away from the light emission source, the area of the inner wall covered by the visible light excitation spot. Light emission structure with improved brightness, characterized in that larger. 28. The brightness of claim 27 wherein each of the plurality of visible light excitation spots is a spot selected from the group consisting of a fluorescent coating, a phosphorescent coating and a light reflecting layer having an inner surface coated with at least one of the coatings. Improved light emission structure. 23. The light emitting device of claim 22, further comprising a light exit portion formed by sidewalls of the two members at a location between the light screen 230 and the light cover 240, the outlet being arranged with an ultraviolet absorbing layer. The light emission structure with improved brightness. 31. The method of claim 30, wherein the UV absorbing layer is selected from the group consisting of a transparent TiO ₂ coating, a transparent ITO coating, a bar-shaped transparent glass plate capable of preventing the transmission of ultraviolet light, a bar-shaped glass block, and a combination thereof. Light enhanced light emitting structure, characterized in that the selected layer. 31. The light emitting structure of claim 30, wherein the ultraviolet absorbing layer further comprises at least one lens arranged at an outlet of the light exit portion. 32. The light emitting structure of claim 30, further comprising a shutter that is composed of a plurality of light reflecting sheets and is arranged in the light exit portion. 34. The method of claim 33, wherein two adjacent gaps of the plurality of light reflecting sheets in the shutter are formed differently in such a way that they become smaller as they approach the light emitting source and become larger as they move away from the light emitting source. Light emission structure with improved brightness. 34. The light emission structure of claim 33, wherein a light guide plate having a light exit surface, a reflection surface, and a near edge portion adjacent to the light exit portion is disposed at the light exit portion. 36. The light emitting structure of claim 35, wherein the light guide plate is selected from the group consisting of a rectangular light guide plate and a wedge shaped light guide plate. 36. The light emitting structure of claim 35, wherein the light exit surface of the light guide plate is arranged not perpendicular to the light exit portion. 36. The apparatus of claim 35, wherein a fixing device is arranged at the proximal edge of the light guide plate adjacent to the light exit portion and connected to the light screen and the light cover to thereby fix the proximal edge portion of the light guide plate on the outlet. Improved brightness light emitting structure, characterized in that. 39. The light emission structure of claim 38, wherein a visible light layer is formed on the surface of the fixture to face toward the light guide plate. 40. The light emitting structure of claim 39, wherein the visible light layer is a layer selected from the group consisting of a fluorescent coating, a phosphorescent coating, and a light reflecting layer having an inner surface coated with at least one of the coatings. 36. The light reflecting shield of claim 35, wherein the light reflecting shield is arranged to surround the reflective surface and the remote edge portion opposite the near edge portion of the light guide plate such that a smaller area is covered by the visible light excitation spot closer to the light emission source. And a plurality of visible light excitation spots interposed between the reflective surface and the light reflection shield in such a manner that a larger area is covered by the visible light excitation spots away from the light emission source. . 23. The light emitting structure of claim 22, further comprising at least one lens arranged at a predetermined position of a light path moving between the light exit portion and the light emission source. A light emitting structure with improved brightness of a side type backlight module applicable to a liquid crystal display device, An optical screen having a partially open tubular structure having a first visible light layer coated on an inner circumference; A light cover substantially extending from one side of the optical screen and bent inward with respect to the first visible light layer; A light emitting diode capable of emitting blue light / ultraviolet light, the light emitting structure having an enhanced brightness comprising a light emitting source wrapped in a concave portion of the light cover. 44. The light emitting structure of claim 43, wherein the cross-sectional contour of the light screen is formed by a function selected from the group consisting of geometric curve functions, polygonal functions, and combinations thereof. 44. The light emitting structure of claim 43, wherein the cross-sectional contour of the light cover is formed by a function selected from the group consisting of geometric curve functions, polygonal functions, and combinations thereof. 44. The light emission structure of claim 43, wherein the visible light layer is a layer selected from the group consisting of a fluorescent coating, a phosphorescent coating, and a light reflecting layer having an inner surface coated with at least one of the coatings. 44. The light emitting structure of claim 43, wherein the visible light layer is broadly arranged on the inner wall of the optical screen to face toward the light emitting source. 45. The light emitting structure of claim 43, wherein when the light emitting source emits blue light, the visible light layer is designed as an array of multiple visible light excitation spots. 49. The method according to claim 48, wherein the closer to the light emission source, the smaller the area of the inner wall covered by the visible light excitation spot, and the farther away from the light emission source, the area of the inner wall covered by the visible light excitation spot. Light emission structure with improved brightness, characterized in that larger. 49. The brightness of claim 48, wherein each of the plurality of visible light excitation spots is a spot selected from the group consisting of a fluorescent coating, a phosphorescent coating and a light reflecting layer having an inner surface coated with at least one of the coatings. Improved light emission structure. 44. The light emitting device of claim 43, further comprising a light exit portion formed by sidewalls of the two members at a predetermined position between the light screen 230 and the light cover 240, the outlet being arranged with an ultraviolet absorbing layer. The light emission structure with improved brightness. 53. The method of claim 51, wherein the UV absorbing layer is selected from the group consisting of a transparent TiO ₂ coating, a transparent ITO coating, a bar-shaped transparent glass plate capable of preventing the transmission of ultraviolet light, a bar-shaped glass block, and a combination thereof. Light enhanced light emitting structure, characterized in that the selected layer. 53. The light emitting structure of claim 51, wherein the ultraviolet absorbing layer further comprises at least one lens arranged at the exit of the light exit section. 52. The light emission structure of claim 51, further comprising a shutter composed of a plurality of light reflecting sheets and arranged in the light exit portion. 55. The method of claim 54, wherein the two adjacent gaps of the plurality of light reflecting sheets in the shutter are formed differently in a manner that becomes smaller as they approach a light emitting source, and becomes larger as they move away from the light emitting source. Light emission structure with improved brightness. 52. The light emission structure of claim 51, wherein a light guide plate having a light exit surface, a reflection surface, and a near edge portion adjacent to the light exit portion is disposed at the light exit portion. 59. The light emitting structure of claim 56, wherein the light guide plate is selected from the group consisting of a rectangular light guide plate and a wedge shaped light guide plate. 59. The light emitting structure of claim 56, wherein the light exit surface of the light guide plate is arranged not perpendicular to the light exit portion. 59. The apparatus of claim 56, wherein a fixing device is arranged at the proximal edge of the light guide plate adjacent to the light exit portion and connected to the light screen and the light cover to thereby fix the proximal edge portion of the light guide plate on the outlet. Improved brightness light emitting structure, characterized in that. 60. The light emission structure of claim 59, wherein a visible light layer is formed on the surface of the fixture so as to face towards the light guide plate. 61. The light emitting structure of claim 60, wherein the visible light layer is a layer selected from the group consisting of a fluorescent coating, a phosphorescent coating, and a light reflecting layer having an inner surface coated with at least one of the coatings. 59. The light reflecting shield of claim 56, wherein the light reflecting shield is arranged to surround the reflecting surface and the remote edge portion opposite the near edge portion of the light guide plate such that a smaller area is covered by the visible light excitation spot closer to the light emission source. And a plurality of visible light excitation spots interposed between the reflective surface and the light reflection shield in such a manner that a larger area is covered by the visible light excitation spots away from the light emission source. . 44. The light emitting structure of claim 43, wherein the light emitting source is a device selected from the group consisting of lead type light emitting diodes, surface mounted light emitting diodes, and combinations thereof. 44. The light emitting structure of claim 43, further comprising at least one lens arranged at a predetermined position of a light passage that moves between the light exit portion and the light emission source. A light emitting structure with improved brightness of a side type backlight module applicable to a liquid crystal display device, An optical screen having a partially open tubular structure having a first visible light layer coated on an inner circumference; One is substantially an extension of one side of the optical screen and bent inward with respect to the first visible light layer, and the other is substantially an extension of the other side of the optical screen and inward with respect to the first visible light layer. Two optical covers that are bent; And a light emitting diode each capable of emitting blue light / ultraviolet light, the light emitting diode comprising at least one light emitting source wrapped in a concave portion of the corresponding light cover. 66. The light emitting structure of claim 65, wherein the cross-sectional contour of the optical screen is formed by a function selected from the group consisting of geometric curve functions, polygonal functions, and combinations thereof. 66. The light emitting structure of claim 65, wherein the cross-sectional contour of any one of the two light covers is formed by a function selected from the group consisting of geometric curve functions, polygonal functions, and combinations thereof. 66. The light emission structure of claim 65, wherein the visible light layer is a layer selected from the group consisting of a fluorescent coating, a phosphorescent coating, and a light reflecting layer having an inner surface coated with at least one of the coatings. 66. The light emitting structure of claim 65, wherein the visible light layer is broadly arranged on an inner wall of the light screen to face toward the light emitting source. 66. The light emitting structure of claim 65, wherein when the light emitting source emits blue light, the visible light layer is designed as an array of multiple visible light excitation spots. 71. The method of claim 70, wherein the closer to the light emitting source, the smaller the area of the inner wall covered by the visible light excitation spot, and the farther away from the light emitting source is the area of the inner wall covered by the visible light excitation spot. Light emission structure with improved brightness, characterized in that larger. 70. The brightness of claim 70, wherein each of the plurality of visible light excitation spots is a spot selected from the group consisting of a fluorescent coating, a phosphorescent coating and a light reflecting layer having an inner surface coated with at least one of the coatings. Improved light emission structure. 66. The apparatus of claim 65, further comprising: a light outlet configured by sidewalls of the two members at a location between the light screen 230 and the light cover 240, the outlet having an ultraviolet absorbing layer arranged thereon. The light emission structure with improved brightness. 74. The method of claim 73, wherein the UV absorbing layer is selected from the group consisting of a transparent TiO ₂ coating, a transparent ITO coating, a bar-shaped transparent glass plate capable of preventing the transmission of ultraviolet light, a bar-shaped glass block, and a combination thereof. Light enhanced light emitting structure, characterized in that the selected layer. 74. The light emitting structure of claim 73, wherein said ultraviolet absorbing layer further comprises at least one lens arranged at the exit of the light exit section. 74. The light emission structure of claim 73, further comprising a shutter comprised of a plurality of light reflecting sheets and arranged in the light exit portion. 77. The method of claim 76, wherein two adjacent gaps of the plurality of light reflecting sheets in the shutter are formed differently in a manner that becomes smaller as they approach a light emitting source, and becomes larger as they move away from the light emitting source. Light emission structure with improved brightness. 74. The light emitting structure of claim 73, wherein a light guide plate having a light exit surface, a reflection surface, and a near edge portion adjacent to the light exit portion is disposed at the light exit portion. 79. The light emitting structure of claim 78, wherein the light guide plate is selected from the group consisting of a rectangular light guide plate and a wedge shaped light guide plate. 79. The light emitting structure of claim 78, wherein the light exit surface of the light guide plate is arranged not perpendicular to the light exit portion. 79. The apparatus of claim 78, wherein a fixing device is arranged at the proximal edge of the light guide plate adjacent to the light exit portion and connected to the light screen and the light cover to thereby fix the proximal edge portion of the light guide plate on the exit portion. Improved brightness light emitting structure, characterized in that. 84. The light emission structure of claim 81, wherein a visible light layer is formed on the surface of the fixture so as to face towards the light guide plate. 83. The light emitting structure of claim 82, wherein the visible light layer is a layer selected from the group consisting of a fluorescent coating, a phosphorescent coating, and a light reflecting layer having an inner surface coated with at least one of the coatings. 79. The light reflecting shield of claim 78, wherein the light reflecting shield is arranged to surround the reflecting surface and the remote edge portion opposite the near edge portion of the light guide plate such that a smaller area is covered by the visible light excitation spot closer to the light emitting source. And a plurality of visible light excitation spots interposed between the reflective surface and the light reflection shield in such a manner that a larger area is covered by the visible light excitation spots away from the light emission source. . 66. The light emitting structure of claim 65, wherein the light emitting source is a device selected from the group consisting of lead type light emitting diodes, surface mounted light emitting diodes, and combinations thereof. 66. The light emitting structure of claim 65, further comprising at least one lens arranged at a predetermined position of a light passage that moves between the light exit portion and the light emitting source.

Images