TWI360699B - Mixed light device - Google Patents

Description

1360699

[0001] [0002] Description of the Invention: [Technical Field] The present invention relates to a light mixer for a liquid crystal display field and an illumination display system. [Prior Art] The liquid crystal display device has the characteristics of (4), low power consumption and less correction, and is widely used in the fields of displays, LCD TVs, mobile phones, and notebook computers, and has become the mainstream of displays, and has more display brightness and color display effects. High requirements. By Jingjing itself, Keguang, "The money group provides the light source. The backlight module is usually divided into a direct-lit backlight module and an edge-lit backlight module. The edge-lit backlight module is difficult to achieve the required brightness (see 'Using high-power white LEDs to achieve high-brightness backlight design, Wang Xianbo and other 'modern display' 72nd issue 'p51 (2007)), therefore, backlight modules mostly use direct-lit backlight structure. The backlight module's light source is mainly used The cold cathode ray tube and the light emitting diode array have been widely used in the backlight module due to their high color saturation, mercury-free, high life and the like, and have been widely used in the backlight module. A schematic diagram of a prior art direct-lit backlight module includes a bottom plate 11, a light-emitting diode array 12 disposed on the bottom plate 11, and a diffusion plate 14[deg.] disposed above the bottom plate 11 [ 0004] The luminescent LED array 12 is composed of a plurality of red, green and blue light emitting diodes 12a, 12hD, 12c, and the arrangement is as follows: a row of red light emitting diodes 12a, green light emitting Diode 12b and a row of blue light emitting two Body 12 (: Junyue Cycle Arrangement) The red, green, and blue light emitting diodes 12a, 096141344 Form end number Α〇ι01 Page 3 of 27 pages 1003458663-0 1360699 December 12, 100 revised replacement page 12b 12c is a top-emitting light-emitting diode. [0005] The red, green, and blue light-emitting diodes 12a, 12b, and 12c of the light-emitting diode array 12 can respectively emit red, green, and blue light. The three colors of red, green and blue light are continuously mixed in the process of leaving the light source and directed toward the diffusing plate 14, and are transmitted to a certain distance and then mixed into white light to be incident on the diffusing plate 14.

[0006] However, due to the size limitation of the backlight module 10, the light mixing distance of the light beam is limited, the white light mixing is difficult to be uniform, and yellowing or bluishness is likely to occur, so that the required white light cannot be achieved, and the backlight module 10 is not provided. When used for backlighting of a display device, uneven light mixing tends to cause chromatic aberration in different regions of the display panel. In order to fully mix the three colors of light into white light, it is necessary to increase the mixing distance, which increases the thickness of the backlight module 10, and does not conform to the trend of increasingly thinner and lighter backlight modules. [0007] In addition, when the LED backlight module is used in a medium-sized or large-sized LCD panel, in order to obtain the required brightness, a large amount of red, green, and

Blue LED. When using these three-color LEDs, it is necessary to mix the colors appropriately to emit uniform white light. [0008] However, the white light generated by mixing a large number of red, green, and blue LEDs has disadvantages such as low energy and poor color saturation; moreover, the generated white light is not uniform enough, and the displayed color cannot be arbitrarily adjusted. [0009] In addition, in the field of liquid crystal display and illumination display system, it is also required to mix the above-mentioned plurality of LED light sources, and the emitted light is concentrated into the corresponding optical components. However, the illuminating characteristic of the LED light source can be approximated to Lambertian, and the illuminating angle of the LED light source can be approximately ±90Q. If a normal optical refractive element such as a lens is used for the LED light source, 096141344 Form No. A0101 Page 4 / Total 27 Page 1003458663-0 100 December i2 Day Shuttle _ Bai Guang Ren. Convergence, can not be issued to the LED light source The large angle of light residuals serves as a convergence. If a curved mirror is used to converge the light from the LED source, the small angle light from the LED source will not converge well. Therefore neither the refractive element nor the transmissive element converge well. Since the power of a single LED light source is relatively low, the light emitted by the LE]) light source is not well concentrated to the corresponding optical component. Therefore, liquid crystal display fields and illumination display systems generally have problems of low brightness. Therefore, how to efficiently converge the light from multiple LED sources into a research hot spot. [0010] In view of the above, it is necessary to provide a light mixer capable of generating light with high energy, high color saturation, adjustable color, and uniform mixing, and efficiently efficiently emits light. Convergence into the corresponding optical components. 'Therefore, the display brightness and light energy utilization of the liquid crystal display system and the illumination display system. SUMMARY OF THE INVENTION [0011] A light mixer 'comprises at least two concentrating reflectors and at least two light sources', wherein the at least two concentrating reflectors have a first focus and a second focus, respectively The at least two light sources are respectively disposed between the at least two concentrating and reflecting devices, and the at least two light sources are respectively disposed on the second focus of the at least two concentrating and reflecting devices, and the light mixer further includes a a common light-emitting surface and a mirror, the common light-emitting surface passes through a first focus, and the field mirror is correspondingly disposed on the common light-emitting surface. [0012] Compared with the prior art, the light mixer provided by the embodiment has the following advantages: First, each light collecting and reflecting device concentrates the light emitted by the light source to the respective first focus, and emits in an emission state. . As in the light mixer 096141344 Form No. A0101 Page 5 of 27 1003458663-0 1360699 100 years. December 12th revised replacement page

Each of the concentrating reflection means has a first focus setting, and the common first focus is provided with a common illuminating surface, so that the light emitted by each concentrating reflecting means is mixed at the first focus of the common illuminating surface. Therefore, the above-mentioned light mixer produces high light energy, high color saturation, and uniform mixing. Secondly, the light mixing device provided in this embodiment can control the opening and closing of the light source in each of the light collecting and reflecting devices by using an appropriate controller, and can realize any adjustment of the color. Therefore, the light mixing provided by this embodiment is provided. The device can provide not only a white light source, but also a light source of other colors. Third, set a mirror on the public light surface. The field lens reduces the aperture angle of the outgoing light, which makes the light distribution more concentrated, thereby improving the utilization of light emitted from the common light exit surface of the light mixer in the liquid crystal display field and the illumination display system. In addition, the above-mentioned setting of the field lens also makes the light emitted from the common light-emitting surface more uniform, thereby correspondingly improving the display effect of the liquid crystal display field and the illumination display system. Therefore, the use of the above-described light mixer in the liquid crystal display field and the illumination display system can improve the display brightness and the utilization of light energy in the liquid crystal display field and the illumination display system. [Embodiment] [0013] Hereinafter, a light mixer of the present technical solution will be specifically described with reference to the accompanying drawings and embodiments. [0014] The present technical solution provides a light mixer that includes at least two concentrating reflectors and at least two light sources. The at least two concentrating reflection devices respectively have a first focus and a second focus, and the at least two concentrating reflection devices have a first focus set therebetween, and the at least two light sources are respectively corresponding to at least two The second focus of the concentrating reflection device further includes a common illuminating surface and a mirror, the common 096141344 form number A0101 page 6 / total 27 pages 1003458663-0 1360699 100 years. December On the 12th, the shuttle is replacing the page smooth surface through the first focus, and the field lens is correspondingly disposed on the above-mentioned common light-emitting surface. [0015] Referring to FIG. 2 and FIG. 3, the light mixing device 20 in this embodiment includes a first concentrating and reflecting device 100, a second concentrating and reflecting device 200, and a third concentrating and reflecting device 300. Further, this embodiment The light mixer 20 further includes a first light source 110, a second light source 210, and a third light source 310. The first concentrating reflection device 100, the second concentrating reflection device 200, and the third concentrating reflection device 300 may each be an ellipsoidal entity. The first concentrating reflection device 100 has a long axis L1 and a first focus 0 and a second focus A on the long axis L1. The second concentrating reflection device 200 has a long axis L2 and a first focus 0 and a second focus B on the long axis L2. The third concentrating reflection device 300 has a long axis L3 and a first focus 0 and a second focus C on the long axis L3. The above three concentrating reflection devices 100, 200, 300 are provided with a first focus 0. The first light source 110 is correspondingly disposed on the second focus A of the first concentrating and reflecting device 100; the second light source 210 is correspondingly disposed on the second focus B of the second concentrating and reflecting device 200; the third light source 310 Correspondingly disposed on the second focus C of the third concentrating reflection device 300. The first focus 0 of the light mixer 20 is provided with a common exit surface 23. In this embodiment, the common light exit surface 23 is a plane. It can be understood that the common illuminating surface 23 can also be a curved surface, and it is only necessary to ensure that the light inside the mixer 20 can be emitted through the common illuminating surface 23 and mixed at the common first focus 0. [0016] As shown in FIG. 4, the light mixer 20 also includes a field mirror 24. The field lens 24 is a hemispherical or a spherically shaped lens. The field lens 24 includes a bottom surface 241 and a spherical surface 242. In this embodiment, the bottom surface 241 of the field lens 24 is a circular flat surface. The radius of the bottom surface 241 is r, the curvature of the point on the surface 242 of the field lens 24 is 096141344. Form number A0101 Page 7 of 27 page 1003458663-0 1360699 __ December 12, 2014 The page is replaced by a radius of f, r and f satisfies the following condition: f/rgl. When the bottom surface of the field lens 24 is in a planar shape, the bottom surface 241 of the field lens 24 may be adhered to the common light-emitting surface 23 by an adhesive (photo-curing adhesive); or the field lens 24 may form the first light-collecting and reflecting device 100, When the second concentrating reflection device 200 and the third concentrating reflection device 300 are directly formed on the common illuminating surface 23, that is, the field lens 24 and the first concentrating and reflecting device 100, the second reflecting device 200, and the third concentrating reflection Device 300 is body formed. When the bottom surface 241 of the field lens 24 has other shapes, the bottom surface 241 of the field lens 24 can be disposed at a distance corresponding to the common light-emitting surface 23 by a fixing means. It can be understood that the field lens 24 may not be limited to the above-described hemispherical or spherical shape, and other shapes may be adopted, as long as it is ensured that most of the light emitted from the common light-emitting surface 23 is concentrated in the field lens 24. . [0017] The size of the field lens 24 can be selected according to actual needs, and it is only necessary to ensure that most of the light emitted from the common light exit surface 23 of the light mixer 20 enters the field lens 24. The material of the field lens 24 is a transparent material such as poly(fluorene decenoate) (PMMA) or glass. [0018] The light source in the light mixer 20 may be a monochromatic LED light source or a multi-color ® LED light source. In this embodiment, the light source is three monochromatic LEDs. The first light source 110 is a red LED and is disposed on the second focus A of the concentrating reflection device 100; the second light source 210 is a green LED and is disposed on the second focus B of the concentrating reflection device 200; the third light source 310 It is a blue LED and is disposed on the second focus C of the concentrating reflection device 300. The angle between the long axis L1 and the common light exit surface 23 is αΐ, the angle between the long axis L2 and the common light exit surface 23 is α2, and the angle between the long axis L3 and the common light exit surface 23 is “3”. The values of the angles αΐ, α2, and α3 may be the same or different, and the value range is 096141344. Form number Α0101 Page 8/27 pages 1003458663-0 “ίοο年'12力1} 日正正脊The page change is 40. The angle between the long axis L1, the long axis L2 and the long axis L3 may be equal or unequal. Preferably, the angles 仏... and ... are equal and both are 60; the long axis L1, the long axis L2 and The angle between the long axis L3 - equal. _9] U will introduce the specific structure of the first concentrating friend device (10). The first concentrating and reflecting device 100 may be an ellipsoidal entity, the material of which is polymethyl a transparent material such as PMMA or glass. The m reflecting device (10) includes a first hollowed out structure 121, a first light exiting surface 23a opposite to the first hollowed out structure 121, and a first hollowed out structure 121. And a first outer surface 122 of the first light-emitting surface 23a. The first hollow structure 121 is disposed at one end of the second focus person of the first light-collecting and reflecting device 1 and is recessed toward the first light-reflecting device 1 a recessed portion 121. The first hollowed out structure 121 includes a first side surface 121a and a first bottom surface i21b, a first side surface i2 1 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 The light emitted by the 110 can be introduced into the first concentrating reflection device 100 through the first side surface 121a #. The first bottom surface 121b can also be a flat surface or other curved surface, and only needs to ensure the light emitted by the first light source 110. After the bottom surface 121b, it may be concentrated to the first focus 0 of the first concentrating reflection device 1 。. [0020] Specifically, the first hollow structure 121 is diced on the first concentrating reflection device 1 A complex space structure is formed, which is formed by rotating a planar figure around a certain rotation axis. It can be understood that the size of the complex space structure excavated on the first concentrating reflection device 100 can be selected according to actual needs. The key is to be able to ensure that the first spotlight reflection 096141344 Form No. A0101 Page 9 / Total 27 Page 1003458663-0 1360699 [ΐ〇〇年.12月12日梭正装置装置(10) Forming a foot a large cavity, the first light source 11〇 can be placed on the second focus 第一 of the first concentrating and reflecting device 1 。. The first outer surface 122 is a connecting first hollow structure 12 丨 and the first illuminating surface An ellipsoid of 23a. The first light source 11 () is received in the first hollow structure 121, disposed on the second focus of the first concentrating reflection device 100 and its light emitting surface (not labeled) and the first hollowed out The first bottom surface 121b of the structure 121 is opposite. The first outer surface 122 may be provided with an anti-reflection film (not shown) for enhancing the reflective function of the first outer surface 122. [0021] During the operation of the first concentrating and reflecting device 1 of the embodiment, a portion of the first light source 110 is disposed on the second focus A of the first concentrating and reflecting device 1 〇〇. The light passes through the first side surface 121a of the hollow structure 丨21 and is introduced into the first concentrating and reflecting device 1 ,, and then reflected by the first outer surface 122 to reach the first focus 〇 of the first concentrating and reflecting device 1〇〇, And emitting from the first focus 0 in a divergent manner; another part of the light emitted by the first light source 11 () passes through the convergence of the first bottom surface 12113 of the first hollow structure 121, and reaches the first light collecting and reflecting device 1〇 The first focus of the cymbal is 〇, and is emitted from the first focus 0 in a divergent manner. [0022] The second concentrating and reflecting device 200 includes a second hollowed out structure 221, a second light emitting surface 23b opposite to the second hollowed out structure 221, and a connection portion. a second hollow surface 221 and a second outer surface 222 of the second light exiting surface 23b; the second hollow structure 221 includes a second side surface 221a and a second bottom surface 221b»the third light collecting and reflecting device 3 includes a first a third hollowed out structure 321 , a third light emitting surface 23 c opposite to the third hollowed out structure 321 , and a third outer surface 322 connecting the third hollowed out structure 321 and the third light emitting surface 23 c ; the third hollowed out structure 321 Including a 096141344 Form No. A0101 Page 10/Total 27 Page 1003458663-0 1360699 100. On December 12th, the third side 32 la and the third bottom surface 321b are verified. It can be understood that the common light-emitting surface 23 of the light mixing device 20 is composed of the first light-emitting surface 23a of the first concentrating and reflecting device 100, the second light-emitting surface 23b of the second concentrating and reflecting device 200, and the third concentrating and reflecting device 300. The three light surface 23c is composed. [0023] The light mixer 20 provided in this embodiment is specifically configured to: provide a preform of three concentrating reflection devices, and perform cutting of a predetermined shape so that the long axis of each concentrating reflection device (LI) The angles between L2 and L3) are equal and a total of the first focus 0 is set; then the common first focus 0 is cut, thereby forming a plane and making the plane the same angle as each of the concentrating reflectors and equal to 60. °. The above plane is the common light exit surface 23 of the light mixer. A mirror 24 is prepared which is bonded to the common light exit surface 23 by an adhesive (photocurable adhesive). [0024] In the light mixer 20, the first concentrating reflection device 100, the second concentrating reflection device 200, and the third concentrating reflection device 300 are disposed with a first focus 0, and the second concentrating reflection device 200, The working principle of the tri-concentrating light reflecting device 300 is the same as that of the first collecting and reflecting device 100. Therefore, the red light emitted by the first concentrating reflection device 100 is divergently emitted from the first focus 0, and the green light emitted by the second concentrating reflection device 200 is divergently emitted from the first focus 0. The blue light emitted by the light reflecting device 300 is also emitted in a divergent manner from the first focus 0. Thereby, red, green and blue light are mixed at a common first focus 0 on the common light exit surface 23 of the light mixer 20, thereby generating white light. The white light is emitted in a divergent manner from the first focus 0. After the field lens 24 disposed on the common light exit surface 23 is concentrated, the exit beam has a smaller aperture angle, thereby making the light distribution from the light mixer 20 more concentrated. In addition, after the convergence of the field lens 24, the outgoing light is more uniform from the common light-emitting surface 23 096141344 Form No. A0101 Page 11 / Total 27 pages 1003458663-0 1360699 When the U-day is released on December 10th. Therefore, the white light generated by the light mixer 20 provided by the present invention is concentrated in distribution, high in energy, and uniform in mixing. [0025] It can be understood that the light combiner 20 described in this embodiment is not limited to the equal angle between the long axes of the concentrating reflection devices and the setting of the angle between the long axis of each concentrating reflection device and the common illuminating surface 23 the way. The light mixer 2〇 may also be disposed in such a manner that the angles between the long axes of the concentrating reflection devices are not equal or the angles between the long axes of the concentrating reflection devices and the common illuminating surface 23 are unequal, and only the condensed reflections need to be ensured. The total focus of the device can be set. Further, the light condenser 20 provided by the present invention is not limited to the light condenser 20 including the three concentrating reflection means described in the embodiment. The light mixer 20 can also be a light condenser 20' that includes two concentrating reflection devices or three or more concentrating reflection devices, and only needs to ensure the first of the condensing reflection devices in the light mixer 20 It can be understood that the focus 〇 setting can be understood that the light concentrator 20 provided in this embodiment can generate white light or other colors of light according to different LED light sources in each concentrating reflection device. In addition, the light mixer 20' provided by the embodiment cooperates with an appropriate controller to individually control the opening and closing of the light source in each of the light collecting and reflecting devices, so that any adjustment of the color can be realized, so the light mixing provided by the embodiment is provided. The device 2 can provide not only a white light source but also a light source of other colors. [0027] In order to verify the light mixing effect and emission efficiency of the light mixer 20 provided by the present embodiment, the following simulation calculation was performed using the illumination design software Light Too Is to use the light mixer 20 in the DLP projection display system. The process of the simulation design is to design a concentrating reflector and perform simulation calculations to obtain the appropriate results. Then, the three concentrating reflectors are spliced together to perform the final simulation calculation. 096141344 Form No. A0101 Page 12 of 27 1003458663-0 ^yjKjyy ίοίί. December 12 Design and simulation of parameters for a single concentrating reflector

[0029] (-) As shown in FIG. 5, during the simulation, a concentrating reflection device 400 is designed, and the concentrating reflection device 400 is an ellipsoidal entity having a long axis L4 and The short-axis L5 ❶ concentrating reflection device 400 includes a hollow structure 421 , a light-emitting surface 423 opposite to the hollow structure 421 , and an outer surface 422 connecting the hollow structure 421 and the light-emitting surface 423 . The hollow structure 421 is a concave portion provided at one end of the second focus d of the condensing reflection device 4 and recessed toward the inside of the condensing reflection device 400. The hollowed out structure 421 includes a side surface 421a and a bottom surface 421b. The bottom surface 421b is a spherical surface, and the side surface 421a is a conical surface. The above-described light-emitting surface 423 is a plane that passes through the first focus 0 and is perpendicular to the long axis L4. The outer surface 422 described above is an ellipsoidal surface, and a reflective film is plated on the outer surface 422. [0〇3〇] In the concentrating reflection device 400, 'the LED light source 410 is disposed on the second focus D." Therefore, the concentrating reflection device 4 can utilize the large-angle light emitted from the LED light source 410. The ellipsoidal reflection of surface 422 converges onto the first focus 0. The small-angle light emitted from the LED light source 410 is concentrated by the spherical refraction of the bottom surface 42lb to the first focus 0. Therefore, the concentrating reflection device 400 combines the advantages of the refractive element and the reflective element to efficiently emit a single LED light source. The light converges. Go to the first focus. [0031] The specific parameters of the concentrating reflection device 400 are as follows. The LED light source 410 is a surface light source. The light source surface of the LED light source 410 has a size of 〇. 5x0. 5rara, and the optical spectrum ranges from 400 to 70 〇 nm, and the illuminating characteristic is a cosine radiator. The above-mentioned concentrating reflection device 400 is a spheroid made of pMMA. The specific parameters of the sphere expanding body are as follows: the long axis L4 is l〇mm, the short axis L5 is 6mra, the distance between the focus 0 and the second focus D is 4mm; the bottom surface 421b is. Form No. A0101 13 pages / total 27 pages 1003458663-0 1360699 [0033] [0034] On December 12, 100, the nuclear replacement page has an arc with a radius of curvature of 3mra, the intersection of the arc and the ellipse long axis L4 The distance of the second focus D is lrara; the side surface 421a is a conical surface having a tangent value of 0. 075, the position of the cone top is located on the long axis L4 of the ellipsoid, and the distance from the light exit surface 423 is 15. 8ram. The above-mentioned concentrating reflection device 400 was modeled by the lighting design software LightTools, and the simulation calculation was performed. The receiving surface was disposed on the light-emitting surface 423, and the tracking light was 100,000. On the light exit surface 423, the main energy is concentrated in a circular spot having a diameter of 2 mm. The calculation of the concentrating and reflecting device 400 of the structure can reach 94.4%. Considering that the optical integrator rod used in the DLP projection display system has an operating angle of ±45° and an exit angle of 45°, the light energy utilization rate that can be received is 86%. (2) Three of the above-mentioned concentrating reflection devices 400 are selected, assembled into a light mixer as shown in Fig. 2, and then simulated and optimized. The above three concentrating and reflecting devices 400 are assembled into a light absorbing device as shown in FIG. 2, and the specific preparation method is as follows: the three concentrating and reflecting devices have a total first focus 0, and each condensed light is collected. The angle between the long axes (L1, L2, L3) of the reflecting device is equal; then the common first focus 0 is cut to form a plane and the plane is the same angle as each of the collecting reflectors and equal to 60 °. The above plane is the common light exit surface 23 of the light mixer 20. On the common light-emitting surface 23, the light-curing adhesive field mirror 24 ° is used for simulation calculation by the lighting design software LightTools. The radiation wavelengths of the first LED light source, the second LED light source and the third LED light source are 550 nm, 430 nm and 670 nm, respectively. The receiving surface is disposed on the light-emitting surface 23, and the trace light is 096141344 Form No. A0101 Page 14 of 27 1003458663-0 [0035] 1360699 | ιΰό年1Z月12日1 00000. When the angles formed by the long axis and the light exiting surface of each of the condensing reflection means are equal, i.e., α 1 , α 2 and α 3 are equal, and the included angles α 1 , « 2 and α 3 are collectively defined as α. When the angle α is: 40. 50. At 60° and 70°, the angle of the emitted light is calculated to be ±90° and ±45. The respective light extraction efficiency. The results are shown in Table 1. [0036] Table 1 light extraction efficiency of the light mixer 20 at different angles

Angle α Efficiency (±90°) Efficiency (±45°) ~~~~~ 40° 75% 50% ~~~~~~~ 50° 73. 3% 43% ~~~~~~~ 60° 81 5% 37% 70° 71% 29% optimized design shows an angle of intersection α of 40. When the spot energy is concentrated in the straight one ''J

In the area with a diameter of 8 ram, the exit angle is ±90. The exit light efficiency can be as high as 75% and the exit angle is ±45. The light output efficiency is the highest, which can reach 5%. Since the optical integrator in the DLP projection display system has a geometry of typically 5.4 x 4 mm, the working angle is ±45. Left and right., so the angle α.4〇. The time ' is at an exit angle of ±45. When the light is emitted, the efficiency is high, and the spot size is large, which does not meet the requirements for use. The circle has an angle α of 60. At the time, the main energy is concentrated in a circular spot having a diameter of 2 2 inm, and the exit angle is ±90. The exiting light efficiency is the highest, and it can reach 81.5%' exit angle of ±45. The light extraction efficiency was 37%. The angle 〇 is (9). Although the spot size meets the requirements, it is ±45. At the same time, the efficiency of the light emitted from the light mixer 2 is too low and does not meet the requirements for use. [0039] In order to solve the problems encountered in the first two cases, the angle α is 6 根据. Time 096141344 Form No. Α0101 Page 15/Total 27. Page 1003458663-0 1360699 _ December 12, 100, the replacement of the page is characterized by a high total light output efficiency, adding a radius of 4 ram to the common illuminating surface 23, curvature A hemispherical field mirror 24 having a half length is used to reduce the angle of the outgoing light. The calculation shows that the spot size is 4 mm in diameter, the exit light efficiency is 70% when the exit angle is 90°, and the exit light efficiency is also improved when the exit angle is ±45°, which can reach 61%. Therefore, the spot size and light extraction efficiency meet the requirements of the optical integrator rod. [0040] After the field lens 24 is disposed on the common light-emitting surface, the aperture angle of the outgoing beam is reduced, the light energy distribution is more concentrated, and the utilization of the light energy is improved. When the aperture angle is reduced, the light rays emitted from the common light-emitting surface 23 are more uniformly mixed, and the display effect of the DLP projection display system is correspondingly improved. [0041] According to the simulation calculation described above, the light mixer 20 obtained in the embodiment can efficiently converge the light energy emitted by the LED light source into the optical integrator rod, thereby improving the display brightness of the DLP projection display system. And utilization of light energy. Further, by controlling the turning on and off of the LED light source in each of the light collecting and reflecting means in the light mixer 20, time separation can be realized for the light emitted from the light emitting surface of the light mixing device 20. This replaces the RGB color wheel rotation in the DLP projection display system to achieve time separation, thus simplifying the system structure. [0042] The light condenser 20 provided in this embodiment has the following advantages: First, each of the light collecting and reflecting devices converges the light emitted by the light source to the respective first focus 0 and emits in an emitted state. Since the first focus 0 is set in each of the light collecting and reflecting devices in the light mixer 20, and the common first light focus surface 0 is provided with a common light exit surface 23, the light emitted by each light collecting and reflecting device is on the public light emitting surface. A focus is mixed. Therefore, the above-mentioned light mixer produces high light energy, high color saturation, and uniform mixing. Secondly, the 096141344 form number A0101 provided in this embodiment is 16 pages/total 27 pages 1003458663-0 1360699 · 10 0. December 12曰 Amendment

The light mixer 20' can cooperate with an appropriate controller to individually control the opening and closing of the light source in each of the light collecting and reflecting devices, so that any adjustment of the color can be realized. Therefore, the light mixing device 20 provided in this embodiment can provide not only a white light source. Light sources of other colors are also available. Third, a mirror 24 is placed on the common illuminating surface 23. The field lens 24 can reduce the aperture angle of the outgoing light, so that the light distribution is more concentrated, thereby improving the light emitted from the common light-emitting surface 23 of the light mixer 2 in the liquid crystal display field and the illumination display system. Utilization rate. Further, the above-described arrangement of the field lens 24 also makes the light residual from the common light exit surface 20 more uniform, thereby correspondingly improving the display effects of the liquid crystal display field and the illumination display system. Therefore, the use of the above-described light mixer 2 in the liquid crystal display field and the illumination display system can improve the display brightness and the utilization of light energy in the liquid crystal display field and the illumination display system. [〇〇43] In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by those skilled in the art of the present invention in the spirit of the present invention are intended to be included in the scope of the following claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a three-dimensional structure of a direct type backlight module of the prior art. FIG. 2 is a schematic perspective view showing a three-dimensional structure of a light mixer according to an embodiment of the present technology. [FIG. 3] FIG. 3 is a bottom view of the light mixer of the embodiment of the present technical solution. [FIG. 4] FIG. 4 is a schematic cross-sectional structural view of a field lens according to an embodiment of the present technical solution. FIG. 5 is a perspective view showing the wearing structure of a single concentrating reflection device according to an embodiment of the present invention.             。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 [Main component symbol description] Backlight module: 10 [0050] Base plate: 11 [0051] Light-emitting diode array: 12 [0052] Red light-emitting diode: 12a [0053] Green light-emitting diode Body: 12b [0054] Blue light emitting diode: 12c [0055] Diffusion plate: 14 [0056] First concentrating reflection device: 100 [0057] First light source: 110 [0058] First hollow structure: 121 [ 0059] First side: 121a [0060] First bottom surface: 121b [0061] First outer surface: 122 [0062] Light mixer: 20 [0063] Common light surface: 23 [0064] First light surface: 23a [ 0065] Second illuminating surface: 23b [0066] Third illuminating surface: 23c 096141344 Form No. A0101 Page 18 of 27

1003458663-0 1360699

Field Mirror: 24 [0068] Bottom of Field Mirror: 241 [0069] Surface of Field Mirror: 242 [0070] Second Concentrating Reflector: 200 [0071] Second Light Source: 210 [0072] Second Digging Empty structure: 221 [0073] Second side: 221a [0074] Second bottom surface: 221b [0075] Second outer surface: 222 [0076] Third concentrating reflection device: 300 [0077] Third light source: 310 [0078] Third hollow structure: 321 [0079] Third side: 321a [0080] Third bottom surface: 3 2 l'b [0081] Third outer surface: 322 [0082] Concentrating light reflecting device in simulation calculation: 400 [0083] Light source: 41 0 [0084] Knockout structure: 421 [0085] Side: 4 21 a 096141344 Form number Α 0101 Page 19 / Total 27 pages ΐ ό .. December 12 nuclear ridge ^ page 1003458663-0 1360699 100 years. December 12th nuclear replacement page [0086] bottom surface: 421b [0087] outer surface: 422 [0088] light-emitting surface: 423 [0089] long axis: L1, L2, L3, L4 [0090] short axis: L5 [0091] Common first focus: 0 [0092] Second focus: A, B, C, D ^ [0093] Angle between the long axis and the common illuminating surface: al, a 2, a 3 [0094] Field mirror bottom Surface radius: r [0095] Curvature radius of the field mirror surface: f • 096141344 Form number A0101 Page 20 of 27 1003458663-0

Claims (1)

1360699 100 years. December i2 day shuttle is _ page seven, the scope of application patent: heart year Z month /% revision this 1. A light mixer, including at least two concentrating reflectors and at least one light source ^, the improvement lies in The at least two concentrating reflection devices respectively have a first focus and a second focus, a total first focus is disposed between the at least two concentrating reflection devices, and the at least two light sources are respectively disposed corresponding to at least two The second focus of the concentrating and reflecting device further includes a common illuminating surface and a mirror, the common illuminating surface passing through the first focus, and the field mirror correspondingly disposed on the common illuminating surface. 2. The light mixer of claim 1, wherein the field lens is a hemispherical or a spherical lens having a bottom surface and a surface as claimed in claim 2 The light mixer, wherein the radius r of the bottom surface of the field lens and the radius of curvature f of the surface satisfy the following condition: f/r^l. The light concentrator of claim 2, wherein the bottom surface of the field lens is bonded to the common light exiting surface by a photocurable adhesive. The light mixer of claim 2, wherein a bottom surface of the field lens is spaced apart from the common light exit surface. The light mixer of claim 2, wherein the field lens is integrally formed with each of the concentrating reflection devices. The light concentrator of claim 2, wherein the material of the field lens is decyl phenyl acrylate or glass. The light concentrator of claim 1, wherein the concentrating reflection device is an ellipsoidal entity, the concentrating reflection device has a long axis, and the first focus and the second focus are set at the length On the shaft. The light concentrator according to claim 8, wherein the concentrating anti-096141344 form number A0101 page 21/total 27 page 1003458663-0 1360699 1100. December 12th attack set includes - hollow structure And a light exiting surface opposite to the hollowed out structure and an outer surface connecting the hollowed out structure and the light exiting surface, wherein the hollowed out structure is disposed at one end of the second focus of the light collecting and reflecting device, and the light source is received in the hollowed out structure. The light-mixing device of claim 9, wherein the common light-emitting surface is composed of light-emitting surfaces of at least two concentrating reflection devices. 11. The light mixer of claim 10, wherein the common light exiting surface of the light mixer is a plane or a curved surface. 12. The light mixer of claim 11, wherein the public outlet The angle between the smooth surface and the long axis of the at least two concentrating reflection devices described above ranges from 40. -70. . The light mixer of claim 1, wherein a diffusing film is disposed on a common light-emitting surface of the light mixer. 14. The light mixer of claim 9, wherein the hollowed out structure comprises a side surface and a bottom surface, and the light source is disposed on the second focus. The light-mixing device of claim 14, wherein the side surface is a ~~-cylindrical or conical surface. The light-mixing device of claim 14, wherein The bottom surface is a spherical surface. The light-mixing device of claim 9, wherein the outer surface is provided with an anti-reflection film. The light concentrator of claim 1, wherein the light source is a monochromatic LED light source or a multi-color LED light source. The light concentrator of claim 1, wherein the material of the concentrating reflector is polymethyl methacrylate or glass. 〇 丨 丨 丨 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 〇 The month i2 correction replacement page includes a first concentrating reflection device, a second concentrating reflection device, and a third concentrating reflection device, wherein the angles between the long axes of the three concentrating reflection devices are equal, and the three concentrating reflections The long axis of the device is equal to the angle of the common light exit surface. The light-mixing device of claim 20, wherein the common light-emitting surface is a flat surface, and the longitudinal axes of the three concentrating reflection devices are equal to an angle of 60° with respect to the common light-emitting surface. The light-mixing device of claim 21, wherein the light-mixing device uses three single-color LEDs of red, green and blue as light sources, and three light-reflecting devices in the light mixer. Corresponding settings. 096141344 Form No. A0101 Page 23 of 27 1003458663-0