Novel thin backlight module and display device thereofTechnical Field
The invention relates to the technical field of display, in particular to a novel thin backlight module and a display device using the backlight module.
Background
The backlight module is one of key components of the liquid crystal display device, and is widely applied to mobile phones, notebooks, flat panels, navigation and television screens. As shown in fig. 1a, it shows a first side-light type backlight module in the prior art, including a light source 1, a light guide plate 11, a reflective sheet 12 below the light guide plate 11, and an optical film set above the light guide plate 11, where the optical film set includes a lower diffusion sheet 13, a lower prism sheet 14, an upper prism sheet 15 and an upper diffusion sheet 16 that are sequentially stacked and arranged upwards, light from the light source enters the optical film set after passing through the light guide plate 11, the light source is primarily diffused by the lower diffusion sheet 13, and then the brightness of forward light is improved by the lower prism sheet 14 and the upper prism sheet 15, and finally the light is slightly diffused by the upper diffusion sheet 16, and the upper diffusion sheet 16 also has the function of protecting the upper prism sheet. Therefore, the backlight module 1 can provide uniform light with higher forward brightness. However, the number of the constituent films of the optical film group is four, so that the overall thickness of the backlight module is increased, the constituent films are required to be assembled piece by piece, and the defects of long production time, low assembly efficiency, high reject ratio and the like exist.
As shown in fig. 1b, another side-light type backlight module in the prior art is shown, which comprises a light source 2, a light guide plate 21, a reflecting sheet 22 below the light guide plate 21 and an optical film set above the light guide plate 21, wherein the optical film set comprises a diffusion sheet 23, a lower prism sheet 24 and an upper prism sheet 25 which are sequentially stacked up, an atomization coating 26 is arranged on the back surface of the upper prism sheet 25, light of the light source enters the optical film set after passing through the light guide plate, the light source is primarily diffused through the diffusion sheet 23, and the brightness of forward light is improved through the lower prism sheet 24 and the upper prism sheet 25, and the atomization coating 26 can homogenize the light and mask flaws. Therefore, the backlight module 2 can provide uniform light with higher forward brightness. The number of the optical film groups is three, the thickness of the whole backlight module is increased, and the defects of long production time consumption, low assembly efficiency, high reject ratio and the like are overcome.
Fig. 1c shows a third side-light type backlight module in the prior art, which comprises a light source 3, a light guide plate 31, a reflecting sheet 32 below the light guide plate 31 and an optical film set above the light guide plate 31, wherein the optical film set comprises a prism sheet 33 and a diffusion sheet 35 which are sequentially and upwardly laminated, the front surface of the prism sheet 33 is provided with an atomization coating 34, light of the light source enters the optical film set after passing through the light guide plate 31, the light source improves the brightness of forward emergent light through the prism sheet 33, and the cooperation of the atomization coating 34 and the diffusion sheet 35 can homogenize the light and mask flaws. Therefore, the backlight module 2 can provide uniform light with higher forward brightness. The number of the optical film groups is two, and the defects of long production time, low assembly efficiency, high reject ratio and the like of the whole backlight module still exist due to the increase of the thickness of the whole backlight module.
Disclosure of Invention
Aiming at the technical problems, the invention aims at: the novel thin backlight module can achieve the same optical effect in the background technology only by comprising a light guide plate and an optical film positioned above the light guide plate. The thickness of the whole backlight module is reduced, the assembly efficiency and the yield of the backlight module can be improved, and meanwhile, the cost of a production and processing link is effectively reduced.
Another object of the invention is: the backlight module provided with the display device can reduce the overall thickness of the display device, improve the assembly efficiency and the yield of the display device, and effectively reduce the cost of production and processing links.
The technical solution of the invention is realized as follows: the novel thin backlight module comprises an optical film and a light guide plate, wherein the optical film is arranged above the light guide plate and comprises a base layer; the lower surface of the base layer is provided with a plurality of prism strips which are arranged in parallel; the plurality of prism strips extend along the transverse direction of the surface of the base layer; the bottom edges of the two adjacent prism strips are positioned on the same straight line; an atomization coating is arranged on the upper surface of the base layer; the upper surface of the light guide plate is provided with a plurality of V-shaped grooves which are arranged in parallel, so that the upper surface of the light guide plate is in a continuous triangle structure; the plurality of V-grooves extend in a longitudinal direction of the light guide plate; the lower surface of the light guide plate is provided with a plurality of groups of convex arrays at intervals along the transverse direction; each group of the protrusion arrays is composed of a plurality of protrusions which are connected end to end along the longitudinal direction.
The bulge is triangular and comprises two inclined planes and a bottom surface; the width of the bottom surface of the bulge along the transverse direction is 3um-100um; the vertical height from the top to the bottom of the bulge is 1.2um-50um; the bottom surface length of the protrusion along the longitudinal direction is 5um-100um; the included angle between one inclined plane and the bottom surface is 1-95 degrees;
The backlight module further comprises a reflecting sheet; the reflecting sheet is arranged below the light guide plate, so that light incident on the surface of the reflecting sheet is reflected into the light guide plate.
Further, the atomized coating has a haze value of 10% to 90%.
Further, the height of the prism strips is 10um-30um; the vertex angle of the prism strips is 25-65 degrees; the top spacing between adjacent prism strips is 15um-35um.
Further, the included angle between two sides of the V-shaped groove is 20-100 degrees; the depth of the V-shaped groove is 2-200 um; the width of the notch of the V-shaped groove is 2um-50um.
Further, the spacing between adjacent bump arrays is 1um-100um.
Furthermore, the base layer is made of PET plastic.
Further, the LED lamp also comprises a light-emitting unit; the light emitting unit corresponds to one side surface of the light guide plate.
Further, the novel thin backlight module comprises a display panel and the novel thin backlight module.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
According to the novel thin backlight module, the number of the optical films is reduced through the light guide plate with the double-sided structure and the optical films with the double-sided structure, and the backlight module can achieve the same optical effect in the background technology only by comprising one light guide plate and one optical film. The thickness of the whole backlight module is reduced, the assembly efficiency and the yield of the backlight module can be improved, and meanwhile, the cost of a production and processing link is effectively reduced. The corresponding display device of the invention also has the same technical effects as described above.
Drawings
The technical scheme of the invention is further described below with reference to the accompanying drawings:
FIG. 1a is a schematic diagram of a first backlight module according to the prior art;
FIG. 1b is a schematic diagram of a second prior art backlight module;
FIG. 1c is a schematic diagram of a third prior art backlight module;
FIG. 2 is a schematic diagram of a backlight module according to the present invention;
FIG. 3 is a schematic cross-sectional view of an optical film of the present invention, as viewed in a transverse direction;
Fig. 4 is a schematic cross-sectional view of the light guide plate of the present invention as viewed in the longitudinal direction;
fig. 5 is a schematic cross-sectional view of the light guide plate of the present invention viewed in the lateral direction;
FIG. 6 is a schematic view showing the distribution of protrusions on the lower surface of a light guide plate according to the present invention;
FIG. 7 is a schematic view of another view angle of the light guide plate according to the present invention;
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present invention.
Fig. 2-6 show a novel thin backlight module according to the present invention, which comprises an optical film 5 and a light guide plate 4, wherein the optical film 5 is disposed above the light guide plate 4, the optical film 5 comprises a base layer 51 made of pet125um plastic, a plurality of prism strips 52 arranged in parallel are formed on the lower surface of the base layer 51, and the plurality of prism strips 52 extend along the longitudinal direction of the surface of the base layer. The X-axis direction identified in fig. 3 is the transverse direction and the Y-axis direction is the longitudinal direction. The bottom edges of two adjacent prism strips 52 lie on the same straight line. The prism bars 52 have a triangular prism structure, and the bottom surfaces of the prism bars 52 are coincident with the lower surface of the base layer 51. The upper surface of the base layer 51 is provided with an atomized coating 53. The atomized coating 53 is formed on the surface of the base layer 51 by coating. The haze value of the atomized coating 53 is 10% -90%. Through the above structural design, after the light passes through the prism strips 52, the light can be concentrated to a user at the most proper angle, and the light utilization rate is improved. The atomized coating 53 can improve the thin strength, realize the scratch-proof function, and the special fog effect can soften emergent light and realize concealing.
The light guide plate 4 is made of PMMA or PC, the thickness of the light guide plate 4 is preferably 2.2mm to 20mm, the length of the light guide plate 4 is preferably 3cm to 600cm, and the width of the light guide plate 4 is preferably 3cm to 500cm. A plurality of V-shaped grooves 41 arranged in parallel are processed on the upper surface of the light guide plate 4 so that the upper surface of the light guide plate 4 has a continuous triangular structure (as shown in fig. 4). The plurality of V-shaped grooves 41 extend in the longitudinal direction of the light guide plate 4. The lower surface of the light guide plate 4 is processed with a plurality of protrusion arrays 42 at intervals along the lateral direction thereof. The bump array 42 is composed of a plurality of bumps 421 (shown in fig. 6) that are joined end to end in the longitudinal direction. The protrusions 421 are integrally formed on the lower surface of the light guide plate. Through the above structural design, the V-shaped groove 41 arranged on the upper surface of the light guide plate 4 and the convex array 42 arranged on the lower surface of the light guide plate can reduce the loss of light, ensure the consistent brightness of a plurality of points, and enhance the light-emitting brightness and the light uniformity of the light guide plate 4.
In the present embodiment, in order to satisfy the same optical effect by the cooperation of one light guide plate 4 and one optical film 5, the height H of the prism bars 51 is 10um to 30um as shown in fig. 3. The apex angle alpha of the prism strip 51 is 25 deg. -65 deg.. The top pitch D of adjacent prism bars 51 is 15um-35um. As shown in fig. 4, the included angle beta between two sides of the V-shaped groove is 20-100 degrees; the depth H1 of the V-shaped groove is 2um-200um; the notch width D1 of the V-shaped groove is 2um-50um. As shown in fig. 4-6, the pitch B1 of adjacent bump arrays 42 is 0.5um to 100um. The protrusion 421 has a triangular shape including two inclined surfaces and a bottom surface, and the bottom surface of the protrusion 421 coincides with the lower surface of the light guide plate 4. The bottom width B of the protrusion 421 in the lateral direction is 3um to 100um; the vertical height H2 from the top to the bottom of the bulge is 1.2um-50um; the bottom surface length S of the protrusion 421 in the longitudinal direction is 5um to 100um; the included angle delta between one inclined plane and the bottom surface is 1-95 degrees. It should be noted that no technical teaching is available in the prior art to obtain the above-mentioned parameter relationship, and a person skilled in the art can implement the same or similar optical effects as the three backlight modules in the background art according to the above-mentioned parameter model.
The backlight module of the embodiment further includes a reflective sheet 6, where the reflective sheet 6 is disposed below the light guide plate 4, so that the light incident on the surface of the reflective sheet 6 is reflected into the light guide plate.
The backlight module of the present embodiment further includes a light emitting unit 7, where the light emitting unit 7 corresponds to a side of the light guide plate 4. The light emitting unit 7 corresponds to the light incident side of the light guide plate 4, the light incident side of the light guide plate 4 is processed with a light incident side microstructure, the light incident side microstructure is similar to the microstructure in the prior art, the light incident side microstructure is a rectangular structure, and the length of the light incident side microstructure is 3-150um, the width is 2um to 50um, and the depth is 1.0 to 30um.
Correspondingly, the embodiment also provides a display device, which comprises a display panel (not marked in the figure) and the thinned backlight module.
In this embodiment, the light of the light emitting unit 7 enters the light guide plate 4, the V-shaped groove 41 disposed on the upper surface of the light guide plate 4 and the convex array 42 disposed on the lower surface of the light guide plate can reduce the loss of light, ensure the brightness of a plurality of points to be consistent, enhance the light emitting brightness and uniformity of the light guide plate 4, adjust the light through the prism strips 51, and enable the light to be concentrated to the user at the most appropriate angle, thereby improving the light utilization rate. The atomized coating 52 can improve the strength of the optical sheet 4, realize the scratch-proof function, and the special matte effect can soften the emergent light and realize concealing.
The light guide plate 4 with the double-sided structure and the optical film 5 with the double-sided structure are arranged, so that the structural form of adopting a plurality of optical films is eliminated, and the backlight module can achieve the same optical effect in the background technology only by comprising one light guide plate and one optical film. The thickness of the whole backlight module is reduced, the assembly efficiency and the yield of the backlight module can be improved, and meanwhile, the cost of a production and processing link is effectively reduced. The corresponding display device of the invention also has the same technical effects as described above.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related arts are included in the scope of the present invention.