Lens, backlight module and liquid crystal display
By setting a corrugated reflection surface outside the light source cavity of the lens, the light is reflected to the light exit surface, the problem of insufficient light exit angle is solved, and the optical angle and spot uniformity are achieved, and the number of LED beads used and the thickness of the backlight module are reduced.
Patent Information
- Application Number
- CN202422744195.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2034-11-11
AI Technical Summary
The existing backlight module lenses are not large enough in the light exit angle, resulting in the need of more LED lamp beads and lenses, and the light spot is uneven.
A lens is designed, with a light source-shaped cavity provided at the first end of the lens, a reflective surface at the second end, and a side surface is a light-out surface, and a corrugated reflection surface is arranged around the outside of the light-out cavity, and a corrugated reflection surface is used to reflect light to the light-out surface, increasing the optical angle and forming diffuse reflection to improve light uniformity.
It improves the overall luminous brightness and spot uniformity of the backlight module, reduces the number of LED lamp beads, reduces the cost, and makes the backlight module thinner.
Smart Images
Figure CN223296243U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of backlight, in particular to a lens, a backlight module and a liquid crystal display. Background Art
[0002] Current TV LCD monitors use 43-inch direct-lit LED (light-emitting diode) backlight modules. The mainstream backlight solutions use two sizes of reflective lenses for the backlight modules, with OD heights of 22mm and 35mm, respectively. The 22mm OD (the distance from the LED to the diffuser) reflective lens solution typically uses three light strips, each with eight LEDs and an LED pitch of Px = 105mm and Py = 145mm. The 35mm OD reflective lens solution typically uses one light strip, each with 21 LEDs and an LED pitch of Px = 30-50mm and Py > 180mm.
[0003] Both of the above solutions have problems. The emission angle of the light from the LED lamp beads by a single lens is not large enough, so the backlight module requires more LED lamp beads and lenses, and the light spot is not uniform enough. Utility Model Content
[0004] Based on this, it is necessary to provide a lens, a backlight module and a liquid crystal display.
[0005] A lens, wherein a light source-shaped cavity is provided in the middle of a first end of the lens, a reflective surface is provided on an end surface of a second end of the lens, the reflective surface gradually inclines from an edge of the second end of the lens to the middle of the second end of the lens toward the first end of the lens, and a side surface of the lens is provided as a light emitting surface;
[0006] A corrugated reflective surface is provided on the first end of the lens at the outer side of the light source shaped cavity, and the corrugated reflective surface is provided around the light source shaped cavity.
[0007] In one embodiment, the corrugated reflective surface includes a first corrugated surface and a second corrugated surface, the first corrugated surface is arranged on the outside of the light source shaped cavity and is arranged around the light source shaped cavity, the second corrugated surface is arranged on the outside of the first corrugated surface and is arranged around the first corrugated surface, the first corrugated surface is convex in the direction close to the second end of the lens, and the second corrugated surface is convex in the direction away from the second end of the lens.
[0008] In one embodiment, the maximum width of the corrugated reflective surface is greater than or equal to the maximum width of the reflective surface.
[0009] In one embodiment, a curved light incident surface is provided on the top of the light source-shaped cavity. The curved light incident surface is formed by rotating a curve around the central axis of the lens. The curved light incident surface is convex toward the first end of the lens.
[0010] In one embodiment, the width of the lens gradually decreases from the first end to the second end.
[0011] In one embodiment, the light-emitting surface includes a frustum surface and an arc surface, one end of the frustum surface is connected to the reflecting surface, the other end of the frustum surface is connected to one end of the arc surface, the other end of the arc surface is connected to the end surface of the first end of the lens, the diameter of the frustum surface gradually decreases from the end close to the arc surface to the end away from the arc surface, and the diameter of the arc surface gradually decreases from the end away from the frustum surface to the end close to the frustum surface.
[0012] In one embodiment, the first end of the lens is configured as a flat supporting surface outside the corrugated reflective surface.
[0013] In one embodiment, the corrugated reflective surface is obtained by using a spark discharge process.
[0014] A backlight module includes the lens described in any one of the above embodiments.
[0015] A liquid crystal display comprises the backlight module described in any one of the above embodiments.
[0016] The above-mentioned lens, backlight module and liquid crystal display are configured with a corrugated reflective surface at the first end of the lens, and the corrugated reflective surface surrounds the LED lamp beads in the light source cavity, so that a portion of the light emitted by the LED lamp beads is reflected by the reflective surface and then reflected to the corrugated reflective surface. The corrugated reflective surface can reflect the light again to the light output surface, which can further improve the overall luminous brightness of the backlight module and effectively improve the optical angle of a single light source. In addition, the characteristics of the corrugation are utilized to form diffuse reflection, which can evenly mix the light with the light above, thereby making the light output more uniform and the light output effect better. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0018] FIG1 is a schematic cross-sectional view of a laser lighting device according to an embodiment;
[0019] Figure 2A A schematic diagram of a simulated light spot of a corrugated surface formed by ultra-precision machining technology according to an embodiment;
[0020] Figure 2B A schematic diagram of a simulated light spot of a corrugated surface formed by a spark discharge process according to an embodiment;
[0021] Figure 3A A schematic diagram of a measured light spot of a corrugated surface formed by ultra-precision machining technology according to an embodiment;
[0022] Figure 3B Schematic diagram of the measured light spot of a corrugated surface formed by a spark discharge process according to an embodiment.
[0023] Description of reference numerals:
[0024] 10. Lens; 101. Bracket; 110. First end of lens; 120. Second end of lens; 130. Reflective surface; 140. Light emitting surface; 150. Corrugated reflective surface; 151. First corrugated surface; 152. Second corrugated surface; 160. Arc-shaped light incident surface; 141. Cone surface; 142. Arc surface; 170. Flat support surface; DETAILED DESCRIPTION
[0025] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0026] like Figure 1A As shown, it is a lens 10 according to an embodiment of the present invention. A light source-shaped cavity is provided in the middle of the first end 110 of the lens 10. A reflective surface 130 is provided on the end surface of the second end 120 of the lens 10. The reflective surface 130 gradually slopes from the edge of the second end 120 of the lens 10 toward the middle of the second end 120 of the lens 10 toward the first end 110 of the lens 10. A light emitting surface 140 is provided on the side surface of the lens 10.
[0027] The first end 110 of the lens 10 is provided with a corrugated reflective surface 150 outside the light source cavity. The corrugated reflective surface 150 is provided around the light source cavity.
[0028] In this embodiment, the lens 10 is a mini reflective lens 10. The first end of the lens 10 can also be called the bottom of the lens 10, and the second end of the lens 10 is called the top of the lens 10. The light source cavity is used to accommodate the LED lamp bead. Specifically, during installation, the lens 10 is installed on the LED lamp bead so that the LED lamp bead is located in the light source cavity, and the first end of the lens 10 is installed on the light bar. When the LED lamp bead emits light, the light emitted by the LED lamp bead passes through the top and side of the light source cavity. A part of the light directly passes through the light emitting surface 140 and is emitted to the outside, and a part reaches the light emitting surface and is reflected by the light emitting surface. Most of the light reflected by the reflective surface 130 passes through the light emitting surface 140 and is emitted to the outside.
[0029] It is worth mentioning that in the traditional lens 10, a small portion of the light emitted by the LED lamp beads located in the light source cavity will be directed toward the bottom of the lens 10, and most of this light is absorbed by the bottom of the lens 10. In addition, part of the light reflected by the light-emitting surface will also be directed toward the bottom of the lens 10, and most of this light is also absorbed by the bottom of the lens 10. As a result, the above-mentioned light cannot be reflected toward the light-emitting surface 140, resulting in a waste of light resources. In the present application, the reflection of the corrugated reflective surface 150 on the outside of the light source cavity is utilized to reflect the light emitted by the above-mentioned LED lamp beads and the light reflected by the reflective surface 130 again toward the light-emitting surface 140, thereby improving the light-emitting performance. In addition, the corrugated characteristics of the corrugated reflective surface 150 are utilized to form diffuse reflection, which can evenly mix the light with the light above, thereby making the light emission more uniform and the light emission effect better, and effectively increasing the light emission angle and the diameter of the light spot, so that the angle of the light spot is larger.
[0030] In the above embodiment, a corrugated reflecting surface 150 is provided at the first end of the lens 10, and the corrugated reflecting surface 150 surrounds the LED lamp bead in the light source cavity, so that a part of the light emitted by the LED lamp bead is reflected by the reflective surface 130 and then reflected to the corrugated reflecting surface 150. The corrugated reflecting surface 150 can reflect the light again to the light emitting surface 140, which can further improve the overall luminous brightness of the backlight module and effectively improve the optical angle of a single light source. In addition, the characteristics of its corrugations are used to form diffuse reflection, which can evenly mix the light with the light above, thereby making the light output more uniform and the light output effect better.
[0031] In order to make the reflection effect of light better, in one embodiment, Figure 1AAs shown, the corrugated reflecting surface 150 includes a first corrugated surface 151 and a second corrugated surface 152. The first corrugated surface 151 is arranged on the outside of the light source cavity and is arranged around the light source cavity. The second corrugated surface 152 is arranged on the outside of the first corrugated surface 151 and is arranged around the first corrugated surface 151. The first corrugated surface 151 is convex in the direction close to the second end of the lens 10, and the second corrugated surface 152 is convex in the direction away from the second end of the lens 10.
[0032] In this embodiment, the corrugated reflective surface 150 includes a first corrugated surface 151 located on the inner side and a second corrugated surface 152 located on the outer side. The first corrugated surface 151 is convex toward the second end of the lens 10. This allows the first corrugated surface 151 to reflect most of the light toward the reflective surface 130 and the light-emitting surface 140, resulting in a better reflection effect. Furthermore, its wavy shape facilitates reflecting light in different directions and increasing the angle of the light spot. Furthermore, the second corrugated surface 152 is convex toward the second end of the lens 10. From the perspective of the interior of the lens 10, the second corrugated surface 152 appears concave, thus converging light. It should be understood that the first corrugated surface 151 located on the inner side can receive more light, so it is necessary to reflect the light in different directions, while the second corrugated surface 152 located on the outer side receives less light than the first corrugated surface 151, so it is necessary to use the concave star to gather light and reflect the light in a concentrated manner. Through the above structure, light can be reflected more efficiently, the mixed light is more uniform, the light output effect is better, and the diameter of the light spot is effectively increased.
[0033] In one embodiment, Figure 1B As shown, the maximum width D of the corrugated reflective surface 150 is greater than or equal to the maximum width L of the reflective surface 130 .
[0034] In this embodiment, the width D of the projection of the corrugated reflecting surface 150 on the plane parallel to the end face of the first end of the lens 10 is greater than or equal to the width L of the projection of the reflecting surface 130 on the plane parallel to the end face of the first end of the lens 10. In this way, the corrugated reflecting surface 150 can fully reflect light to the reflecting surface 130 and the light emitting surface 140, and can effectively increase the range of mixed light, which is conducive to increasing the light emitting angle, thereby effectively increasing the diameter of the light spot.
[0035] In one embodiment, Figure 1A As shown, an arcuate light incident surface 160 is provided on the top of the light source-shaped cavity. The arcuate light incident surface 160 is formed by rotating a curve around the central axis of the lens 10 . The arcuate light incident surface 160 is convex toward the first end of the lens 10 .
[0036] In this embodiment, the curve at the top of the light source-shaped cavity rotates with the central axis of the lens 10 as the rotation axis, forming an arcuate light entrance surface 160. In a cross-sectional view of the lens 10, the arcuate light entrance surface 160 is symmetrically arranged about the central axis of the lens 10 and convex toward the first end of the lens 10. This arrangement of the arcuate light entrance surface 160 can better diffuse the light from the LED lamp beads in different directions, thereby increasing the light output angle and effectively increasing the diameter of the light spot.
[0037] In one embodiment, the width of the lens 10 gradually decreases from the first end 110 to the second end 120. In this embodiment, the overall width of the lens 10 decreases from the first end to the second end. This helps the bottom (first end) to better and more fully reflect light to the light exit surface 140, and helps the light exit surface 140 to diffuse the emitted light outward, making the diameter of the light spot larger.
[0038] In one embodiment, Figure 1A As shown, the light-emitting surface 140 includes a frustum surface 141 and an arc surface 142, one end of the frustum surface 141 is connected to the reflecting surface 130, the other end of the frustum surface 141 is connected to one end of the arc surface 142, the other end of the arc surface 142 is connected to the end surface of the first end of the lens 10, the diameter of the frustum surface 141 gradually decreases from the end close to the arc surface 142 to the end away from the arc surface 142, and the diameter of the arc surface 142 gradually decreases from the end away from the frustum surface 141 to the end close to the frustum surface 141.
[0039] In this embodiment, in the cross-sectional view of the lens 10, the edge of the frustum 141 is an inclined straight line, and the frustum 141 gradually tilts toward the inner side of the lens 10 from the end close to the arc surface 142 to the end away from the arc surface 142. The edge of the arc surface 142 is an inclined and curved curve, and the arc surface 142 gradually tilts toward the inner side of the lens 10 from the end away from the frustum 141 to the end close to the frustum 141. In this way, the overall width of the lens 10 decreases from the first end to the second end. This is beneficial for the bottom (first end) to better and more fully reflect light to the light output surface 140, and is beneficial for the light output surface 140 to diffuse the output light outward, so that the diameter of the light spot is larger.
[0040] It is worth mentioning that both the OD22 and OD35 solutions have their own problems: the OD22 solution requires more light strips and is more expensive, while the OD35 solution, although effectively reducing the number of light strips, makes the backlight module thicker due to the greater distance between the LED and the diffusion film, which is not conducive to the lightweight design of the backlight module and display.
[0041] In one embodiment, the OD height is 25mm. By setting a corrugated reflective surface 150 through the lens 10, the angle of the light spot can be effectively increased, so that the light output effect is better. In this case, the distance from the LED to the diffusion film can be set to 25mm. Compared with the OD35 solution, the thickness of the backlight module is effectively reduced, so that the display screen can be thinner and lighter. In addition, since the light output angle is increased, the size of the lens 10 can be reduced, thereby further reducing the cost. In this embodiment, the size of the lens 10 is 16mm*16mm, compared with the 17.5mm*17.5mm of the OD22 solution, it is more material-saving and has lower cost. In addition, in this embodiment, one light bar can be used, and 16 LED lamp beads are arranged on each light bar. Compared with the traditional OD22 and OD35 solutions, the backlight module can be made thin enough, and one light bar can be used to achieve a uniform distribution of light spot visual effects, effectively reducing costs.
[0042] In order to make the lens 10 more stable when installed on the light bar, in one embodiment, the first end of the lens 10 is configured as a flat supporting surface 170 outside the corrugated reflective surface 150 .
[0043] In this embodiment, a flat support surface 170 is provided near the outer side of the first end of the lens 10. The flat support surface 170 is a plane. In some embodiments, a positioning column is provided on the flat support surface 170. The positioning column is used to be inserted into the mounting hole of the light bar. The flat support surface 170 is in contact with the surface of the light bar. This is conducive to better and more sufficient contact of the lens 10 with the surface of the light bar, thereby making the lens 10 more firmly installed on the light bar.
[0044] In one embodiment, the corrugated reflective surface 150 is obtained by using a spark discharge process.
[0045] In this embodiment, the corrugated reflective surface 150, processed using a spark discharge process, effectively enhances the light mixing effect, resulting in a better light mixing effect and facilitating an increase in the diameter of the light spot. It should be understood that if the corrugated reflective surface 150 is formed using ultra-precision machining, the texture on the side surface of the lens 10 would be too transparent due to the ultra-precision machining process used on the side surface of the lens 10, resulting in an uneven transition between the center of the light spot of the lens 10. Therefore, in this embodiment, the corrugated reflective surface 150 is formed using a spark discharge process.
[0046] In the case of simulation, Figure 2B As shown in the figure, the simulated light spot of the corrugated surface formed by the spark discharge process is compared with Figure 2A The simulated light spot of the corrugated surface formed by ultra-precision machine tools has better light mixing effect and a larger light spot angle; Figure 3B As shown in the figure, the measured light spot of the corrugated surface formed by the spark discharge process is compared with Figure 3A The measured light spot of the corrugated surface formed by ultra-precision machining has a better light mixing effect and a larger light spot angle. This shows that, whether in simulation or actual measurement, the corrugated surface formed by the spark discharge process can make the light mixing of the lens 10 more uniform and help increase the diameter of the light spot. This shows that the texture formed by the spark discharge process on the bottom of the lens 10 ensures that the light reflected from the bottom of the lens 10 is then reflected from the side surface of the lens 10 and refracted above the lamp for uniform light mixing.
[0047] It should be understood that the spark discharge process used in this application is a mature process and belongs to the prior art. This application does not improve the spark discharge process, but only uses the spark discharge process to process the bottom of the lens to form the corrugated reflective surface 150.
[0048] In one embodiment, the flat support surface 170 is processed using a spark discharge process.
[0049] In this embodiment, the flat supporting surface 170 is also processed by the spark discharge process, so that the overall reflective effect of the first end of the lens 10 is uniform, and the light mixing effect of the lens is better.
[0050] Here is a concrete example:
[0051] In this embodiment, the size of the backlight module is 43 inches, and the light bar design is as follows: OD height = 25mm, using 1 light bar x 16 lamp beads, pitch x = 30 ~ 65mm, pitch y> 180mm,
[0052] 1. Mixed light OD height: Combining the OD22 three-light bar solution and the OD35 one-light bar solution, the new lens mixed light is set to 0D25mm, so that the backlight module can use one light bar while maintaining the OD25 thinness and lightness, and achieve uniform distribution of light spot visual effects.
[0053] 2. Mini reflective lens size: reduced from 17.5mm*17.5mms to 16mm*16mm, saving materials.
[0054] 3. Optimized design of the bottom texture of the lens.
[0055] For the bottom of the LED lens, ultra-precision machine tool processing technology is used to process the surface texture of the lens mold side, resulting in a more transparent and fine texture surface, allowing light to penetrate further. Through modeling simulation, simulation results are compared and analyzed, and simulated spot diagrams are compared. The texture surface processed by ultra-precision machine tools on the bottom of the lens is compared with the texture surface produced by spark machine tools. The spot angle of the LED lens is significantly larger. Please refer to the comparison results. Figures 2A to 3B .
[0056] Based on the simulation results, we further used ultra-precision machine tools to process the texture on the side surface of the lens mold and conducted comparative analysis on the injection molded lens samples. The optical performance showed that the optical angle was significantly improved, and the expected design effect could be achieved.
[0057] 4. Surface optimization and simulation are used to adjust the line shape of the incident and reflective surfaces, and to adjust the density distribution of the LED light output to make the lens spot diameter larger and more uniform. Actual mold processing verification is also conducted, resulting in a product with a larger and more uniform spot angle.
[0058] 5. Lens bottom texture processing. Since the lens side surface is processed by ultra-precision machine tools, the lens side surface texture is too transparent, and the transition between the lens spot and the center of the lamp is not uniform. Therefore, the bottom of the lens is set with spark discharge texture, so that the light reflected from the bottom of the lens is reflected from the side surface of the lens and refracted to the top of the lamp for uniform light mixing.
[0059] In one embodiment, a backlight module is provided, comprising the lens 10 described in any one of the above embodiments.
[0060] In this embodiment, the backlight module includes a light bar on which a plurality of LED lamp beads are disposed. Each LED lamp bead is disposed in a light source-shaped cavity of a lens 10 .
[0061] The lens 10 in each embodiment is suitable for a 43-inch backlight module. In this embodiment, since the lens 10 is provided with a corrugated reflective surface 150, the reflective effect of the bottom of the lens 10 is better, which effectively improves the light output efficiency and makes the light mixing more uniform. Compared with the traditional OD22 and OD35 solutions, the backlight module can use fewer LED lamp beads to achieve a better light output effect. In this embodiment, the backlight module includes a light bar, and 16 LED lamp beads are arranged on the light bar. A lens 10 is provided on each LED lamp bead, so that the lens 10 is arranged on the outside of the LED lamp bead through the light source-shaped cavity cover. Moreover, under this solution, pitch x = 30 ~ 65mm, and pitch y> 180mm.
[0062] In one embodiment, a liquid crystal display is provided, comprising the backlight module described in any one of the above embodiments.
[0063] In the above embodiment, a corrugated reflecting surface 150 is provided at the first end of the lens 10, and the corrugated reflecting surface 150 surrounds the LED lamp bead in the light source cavity, so that a part of the light emitted by the LED lamp bead is reflected by the reflective surface 130 and then reflected to the corrugated reflecting surface 150. The corrugated reflecting surface 150 can reflect the light again to the light emitting surface 140, which can further improve the overall luminous brightness of the backlight module and effectively improve the optical angle of a single light source. In addition, the characteristics of its corrugations are used to form diffuse reflection, which can evenly mix the light with the light above, thereby making the light output more uniform and making the backlight effect better.
[0064] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0065] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.
Claims
1. A lens, characterized in that: A light source-shaped cavity is provided in the middle of the first end of the lens, a reflective surface is provided on the end surface of the second end of the lens, the reflective surface is gradually inclined from the edge of the second end of the lens to the middle of the second end of the lens toward the first end of the lens, and the side surface of the lens is provided as a light emitting surface; A corrugated reflective surface is provided on the first end of the lens at the outer side of the light source shaped cavity, and the corrugated reflective surface is provided around the light source shaped cavity.
2. The lens according to claim 1, wherein The corrugated reflecting surface includes a first corrugated surface and a second corrugated surface. The first corrugated surface is arranged outside the light source shaped cavity and surrounds the light source shaped cavity. The second corrugated surface is arranged outside the first corrugated surface and surrounds the first corrugated surface. The first corrugated surface is convex in the direction close to the second end of the lens, and the second corrugated surface is convex in the direction away from the second end of the lens.
3. The lens according to claim 1, wherein The maximum width of the corrugated reflective surface is greater than or equal to the maximum width of the reflective surface.
4. The lens according to claim 1, wherein An arc-shaped light incident surface is provided on the top of the light source-shaped cavity. The arc-shaped light incident surface is formed by rotating a curve around the central axis of the lens. The arc-shaped light incident surface is convexly provided toward the first end of the lens.
5. The lens according to claim 1, wherein The width of the lens gradually decreases from the first end to the second end.
6. The lens according to claim 5, wherein: The light-emitting surface includes a frustum surface and an arc surface, one end of the frustum surface is connected to the reflecting surface, the other end of the frustum surface is connected to one end of the arc surface, the other end of the arc surface is connected to the end surface of the first end of the lens, the diameter of the frustum surface gradually decreases from the end close to the arc surface to the end away from the arc surface, and the diameter of the arc surface gradually decreases from the end away from the frustum surface to the end close to the frustum surface.
7. The lens according to any one of claims 1 to 6, characterized in that: The first end of the lens is arranged as a flat supporting surface outside the corrugated reflecting surface.
8. The lens according to any one of claims 1 to 6, characterized in that: The corrugated reflecting surface is obtained by using a spark discharge process.
9. A backlight module, characterized in that: The lens comprises the lens described in any one of claims 1 to 8.
10. A liquid crystal display, characterized in that: Including the backlight module described in claim 9.