技术领域technical field
本发明涉及一种背光模组，尤其涉及一种用于小尺寸显示设备的背光模组。The invention relates to a backlight module, in particular to a backlight module for small-sized display devices.
背景技术Background technique
现有技术中的背光模组包括光源、导光模板及光学模片组，该光源一般采用红、绿、蓝三原色的发光二极管混光形成的白光光源，该白光光源具有较大的色域，使显示设备所显示的色彩更加丰富。但是，由于三原色发光二极管需要较大的混光区域以防止色差产生，因此不适合应用于小尺寸显示面板中。目前在小尺寸显示设备的背光模组中，一般直接采用白光LED作为光源，然而，此种白光LED的色域较小，无法满足小尺寸显示设备对于丰富色彩的趋势要求。The backlight module in the prior art includes a light source, a light guide template and an optical module group. The light source generally adopts a white light source formed by mixing light-emitting diodes of red, green and blue primary colors. The white light source has a large color gamut. Make the colors displayed by the display device richer. However, since the three-primary-color light-emitting diodes require a larger light mixing area to prevent color aberration, they are not suitable for use in small-sized display panels. At present, in the backlight modules of small-sized display devices, white LEDs are generally directly used as light sources. However, the color gamut of this kind of white LEDs is small, which cannot meet the trend requirements of small-sized display devices for rich colors.
发明内容Contents of the invention
有鉴于此，提供一种具有较高色域的适用于小尺寸显示设备的背光模组。In view of this, a backlight module suitable for small-sized display devices with a relatively high color gamut is provided.
一种背光模组，包括导光板及光源模块。该导光板包括底面、与该底面相对的出光面，及连接该底面和出光面的相邻的第一侧面和第二侧面，该第一侧面和第二侧面相交的角落处形成有扇形柱缺口。该光源模块包括第一激光源、第二激光源、第三激光源、第二分光镜、第三分光镜及微机电反射镜。该第一激光源、第二激光源及第三激光源均与该第一侧面相对设置并沿该第一侧面延伸方向排列，该第一激光源、第二激光源及第三激光源分别用于发出三原色激光。该第二分光镜和第三分光镜分别与该第二激光源和第三激光源相对并沿该第一侧面延伸方向排列，该第二分光镜用于反射该第二激光源发出的激光，透射该第一激光源发出的激光，并使透射的该第一激光源发出的激光与反射的该第二激光源发出的激光混光；该第三分光镜用于反射该第三激光源发出的激光，透射该第一激光源和第二激光源发出的激光，并使透射的该第一激光源和第二激光源发出的激光与反射的该第三激光源发出的激光混光，形成白光光束。该微电反射镜与该扇形柱缺口相对设置，该微机电反射镜可在一驱动电压的驱动下绕一转轴以预定频率往复转动，该转轴与该扇形柱缺口所对应的圆柱形的中心轴重合。该微机电反射镜具有与该扇形柱缺口相对的反射面，该白光光束入射至该反射面对应于该转轴的部分，并由该微机电反射镜的往复转动形成从该扇形柱缺口入射至该导光板的扫描光束，进一步经由该导光板散射后从该出光面出射形成面光源。A backlight module includes a light guide plate and a light source module. The light guide plate includes a bottom surface, a light-emitting surface opposite to the bottom surface, and adjacent first and second sides connecting the bottom surface and the light-emitting surface, and a fan-shaped column gap is formed at the corner where the first and second sides intersect. . The light source module includes a first laser source, a second laser source, a third laser source, a second beam splitter, a third beam splitter and a micro-electromechanical mirror. The first laser source, the second laser source and the third laser source are all arranged opposite to the first side and arranged along the extending direction of the first side. The first laser source, the second laser source and the third laser source are respectively used To emit three primary colors of laser light. The second beam splitter and the third beam splitter are respectively opposite to the second laser source and the third laser source and arranged along the extension direction of the first side, the second beam splitter is used to reflect the laser light emitted by the second laser source, The laser light emitted by the first laser source is transmitted, and the transmitted laser light emitted by the first laser source is mixed with the reflected laser light emitted by the second laser source; the third beam splitter is used to reflect the laser light emitted by the third laser source The laser light from the first laser source and the second laser source is transmitted, and the transmitted laser light from the first laser source and the second laser source is mixed with the reflected laser light from the third laser source to form Beam of white light. The microelectromechanical mirror is arranged opposite to the notch of the fan-shaped column, and the micro-electromechanical mirror can be driven by a driving voltage to reciprocate at a predetermined frequency around a rotating shaft, and the rotating shaft is the central axis of the cylinder corresponding to the notch of the fan-shaped post. coincide. The micro-electromechanical mirror has a reflective surface opposite to the notch of the fan-shaped column. The scanning light beam of the light guide plate is further scattered by the light guide plate and emerges from the light emitting surface to form a surface light source.
相对于现有技术，本实施例的背光模组采用三原色激光源及分光镜进行混色，并由一微机电反射镜扫描反射混色后的白光光束，由于激光源体积和分光镜均可以做得较小，微机电反射镜的体积也较小，因此，使得光源模块的体积较小，采用该光源模块的背光模组体积也较小，从而适合应用于小尺寸显示设备的背光模组。Compared with the prior art, the backlight module of this embodiment uses three primary color laser sources and a beam splitter for color mixing, and a micro-electromechanical mirror scans and reflects the white light beam after color mixing. Since the volume of the laser source and the beam splitter can be made smaller The size of the micro-electromechanical reflector is small, so the volume of the light source module is small, and the volume of the backlight module using the light source module is also small, so it is suitable for the backlight module of a small-sized display device.
附图说明Description of drawings
图1是本发明第一实施例提供的背光模组的侧面示意图。FIG. 1 is a schematic side view of the backlight module provided by the first embodiment of the present invention.
图2是图1的背光模组中的光源模块和导光板的构造示意图。FIG. 2 is a schematic structural view of a light source module and a light guide plate in the backlight module of FIG. 1 .
图3是图2中III部分的放大图。Fig. 3 is an enlarged view of part III in Fig. 2 .
图4是图1中的背光模组中的光源模块和导光板的另一实施方式的构造示意图。FIG. 4 is a schematic structural view of another embodiment of a light source module and a light guide plate in the backlight module in FIG. 1 .
图5是图1中的背光模组中的光源模块和导光板的第三实施方式的构造示意图。FIG. 5 is a schematic structural view of a third embodiment of a light source module and a light guide plate in the backlight module in FIG. 1 .
主要元件符号说明Description of main component symbols
如下具体实施方式将结合上述附图进一步说明本发明。The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings.
具体实施方式Detailed ways
请参阅图1，本发明实施例提供一种背光模组100，包括光源模块10、导光板20及光学模片组30。Referring to FIG. 1 , an embodiment of the present invention provides a backlight module 100 including a light source module 10 , a light guide plate 20 and an optical module set 30 .
请一并参阅图2和图3，本实施例中，该导光板20为平板导光板，包括底面21、与底面21相对的出光面22以及连接底面21与出光面22且相邻的第一侧面23和第二侧面24，该导光板20的第一侧面23和第二侧面24相交的角落处形成一扇形柱缺口25，该扇形柱缺口25所对应圆柱的中心轴252垂直于该出光面22。本实施例中，该扇形柱缺口25对应的圆心角为90度，且该扇形柱缺口25所对应圆柱形的中心轴252为该第一侧面23与该第二侧面24的交线。Please refer to FIG. 2 and FIG. 3 together. In this embodiment, the light guide plate 20 is a flat light guide plate, including a bottom surface 21, a light-emitting surface 22 opposite to the bottom surface 21, and a first adjacent first surface connecting the bottom surface 21 and the light-emitting surface 22. The side 23 and the second side 24, a fan-shaped post gap 25 is formed at the corner where the first side 23 and the second side 24 of the light guide plate 20 intersect, and the central axis 252 of the column corresponding to the fan-shaped post gap 25 is perpendicular to the light-emitting surface twenty two. In this embodiment, the central angle corresponding to the fan-shaped column notch 25 is 90 degrees, and the cylindrical central axis 252 corresponding to the fan-shaped column notch 25 is the intersection line of the first side 23 and the second side 24 .
该光学模片组30设置于该导光板20的出光面22一侧，其包括沿远离该出光面22的方向依次设置的第一棱镜片31、第二棱镜片32及扩散片33，该第一棱镜片31和第二棱镜片32分别包括多个并排设置的三角棱镜，且该第一棱镜片31的多个三角棱镜的延伸方向垂直于该第二棱镜片32的多个三角棱镜的延伸方向，该第一棱镜片31和第二棱镜片32用于会聚光线。该扩散片用于将光线均匀扩散，以得到出光均匀且宽视角的面光源。The optical module group 30 is disposed on the side of the light-emitting surface 22 of the light guide plate 20, and includes a first prism sheet 31, a second prism sheet 32, and a diffusion sheet 33 arranged in sequence along a direction away from the light-emitting surface 22. A prism sheet 31 and the second prism sheet 32 respectively comprise a plurality of triangular prisms arranged side by side, and the extension direction of the plurality of triangular prisms of the first prism sheet 31 is perpendicular to the extension of the plurality of triangular prisms of the second prism sheet 32 direction, the first prism sheet 31 and the second prism sheet 32 are used to converge light. The diffuser is used to uniformly diffuse light to obtain a surface light source with uniform light output and wide viewing angle.
该光源模块10包括第一激光源11、第二激光源12、第三激光源13、第一分色镜14、第二分色镜15、第三分色镜16、光路调整反射镜17及摆动式(oscillatory)微机电反射镜(MEMS mirror)18。该第一激光源11用于发出红色激光112，第二激光源12用于发出绿色激光122，第三激光源13用于发出蓝色激光132，该第一激光源11、第二激光源12、第三激光源13与该第一侧面23相对设置，且出射光方向平行于该出射面，本实施例中，该第一激光源11、第二激光源12、第三激光源13的出射光方向进一步垂直于该第一侧面23。The light source module 10 includes a first laser source 11, a second laser source 12, a third laser source 13, a first dichroic mirror 14, a second dichroic mirror 15, a third dichroic mirror 16, an optical path adjustment mirror 17 and Oscillatory MEMS mirror 18 . The first laser source 11 is used to emit a red laser 112, the second laser source 12 is used to emit a green laser 122, and the third laser source 13 is used to emit a blue laser 132. The first laser source 11, the second laser source 12 , The third laser source 13 is arranged opposite to the first side 23, and the direction of the emitted light is parallel to the outgoing surface. In this embodiment, the output of the first laser source 11, the second laser source 12, and the third laser source 13 The light emitting direction is further perpendicular to the first side 23 .
该第一分色镜14、第二分色镜15及第三分色镜16分别位于该第一激光源11、第二激光源12和第三激光源13与该第一侧面23之间且沿靠近该扇形柱缺口25的方向依次排列，该第一分色镜14、第二分色镜15及第三分色镜16为平板状且相互平行，本实施例中，第一分色镜14、第二分色镜15及第三分色镜16与该第一侧面23成45度夹角。该第一分色镜14与该第一激光源11相对设置，且该第一分色镜14反射红色光并透射红色光波长外的光，该第一激光源11发出的红色激光112经该第一分色镜14反射后依次透射该第二分色镜15和第三分色镜16；该第二分色镜15与该第二激光源12相对设置，且该第二分色镜15反射绿色光并透射绿色光波长外的光，该第二激光源12发出的绿色激光122经该第二分色镜15反射后与透射该第二分色镜15的红色激光112混合，即，该红色激光112从该第二分色镜15的出射点与该绿色激光122在该第二分色镜15的反射点相同，该红色激光112与绿色激光122混光后一起透射该第三分色镜16；该第三分色镜16与该第三激光源13相对设置，且该第三分色镜16反射蓝色光并透射蓝色光波长外的光，该第三激光源13发出的蓝色激光132经该第三分色镜16反射后与透射该第三分色镜16的红色激光112和绿色激光122混合，即，该红色激光112和绿色激光122从该第三分色镜16的出射点与该蓝色激光132在该第三分色镜16的反射点相同，该红色激光112、绿色激光122及蓝色激光132混光后形成沿平行于该出光面22和第一侧面23的方向传播的白光光束19。The first dichroic mirror 14, the second dichroic mirror 15 and the third dichroic mirror 16 are respectively located between the first laser source 11, the second laser source 12 and the third laser source 13 and the first side 23 and Arranged in sequence along the direction close to the fan-shaped column gap 25, the first dichroic mirror 14, the second dichroic mirror 15 and the third dichroic mirror 16 are flat and parallel to each other. In this embodiment, the first dichroic mirror 14. The second dichroic mirror 15 and the third dichroic mirror 16 form an angle of 45 degrees with the first side 23 . The first dichroic mirror 14 is arranged opposite to the first laser source 11, and the first dichroic mirror 14 reflects red light and transmits light other than the wavelength of red light, and the red laser 112 emitted by the first laser source 11 passes through the The first dichroic mirror 14 transmits the second dichroic mirror 15 and the third dichroic mirror 16 sequentially after reflection; the second dichroic mirror 15 is opposite to the second laser source 12, and the second dichroic mirror 15 Reflecting green light and transmitting light outside the wavelength of green light, the green laser light 122 emitted by the second laser source 12 is reflected by the second dichroic mirror 15 and mixed with the red laser light 112 transmitted through the second dichroic mirror 15, that is, The exit point of the red laser 112 from the second dichroic mirror 15 is the same as the reflection point of the green laser 122 in the second dichroic mirror 15, and the red laser 112 and the green laser 122 are mixed and transmitted through the third dichroic mirror together. Chromatic mirror 16; the third dichroic mirror 16 is arranged opposite to the third laser source 13, and the third dichroic mirror 16 reflects blue light and transmits light outside the wavelength of blue light, and the third laser source 13 emits The blue laser 132 is reflected by the third dichroic mirror 16 and mixed with the red laser 112 and the green laser 122 transmitted through the third dichroic mirror 16, that is, the red laser 112 and the green laser 122 pass through the third dichroic mirror The exit point of 16 is the same as the reflection point of the blue laser 132 on the third dichroic mirror 16, and the red laser 112, the green laser 122 and the blue laser 132 are mixed to form a The white light beam 19 propagates in the direction of the side 23 .
该微机电反射镜18与该扇形柱缺口25相邻，该微机电反射镜18具有一转动轴182及一反射面184，该转动轴182与该扇形柱缺口25所对应圆柱形的中心轴252重合，该反射面184与该扇形柱缺口25相对且垂直于该出光面22。该微机电反射镜18为微机电组件，其在接收一电压驱动后，将以该转动轴182为轴作简谐运动，即在一定角度范围内以预定频率作往复摆动。The micro-electromechanical mirror 18 is adjacent to the notch 25 of the fan-shaped column. The micro-electromechanical mirror 18 has a rotating shaft 182 and a reflecting surface 184. The rotating shaft 182 is corresponding to the cylindrical central axis 252 of the notch 25 Coincidentally, the reflective surface 184 is opposite to the fan-shaped column notch 25 and is perpendicular to the light-emitting surface 22 . The micro-electro-mechanical mirror 18 is a micro-electro-mechanical component. After being driven by a voltage, it will perform simple harmonic motion around the rotating shaft 182 , that is, reciprocate at a predetermined frequency within a certain angle range.
该光路调整反射镜17与该第一侧面23相邻且设置于该第三分色镜16与该微机电反射镜18之间，该光路调整反射镜17用于将自第三分色镜16出射的白光光束19反射至该微机电反射镜18的反射面184与该转动轴182相邻近的位置。该白光光束19由该微机电反射镜18的反射面184反射后进一步经由该扇形柱缺口25进入该导光板20，由于该转动轴182与该扇形柱缺口25的中心轴252重合，在该微机电反射镜18在一定角度范围内以预定频率作往复摆动时，经由该反射面184反射的白光光束19在该导光板20内形成往复摆动的扫描光束，该扫描光束经该导光板20的进一步散射，从而转化为一均匀面光源由该出光面22出射。The optical path adjustment mirror 17 is adjacent to the first side 23 and is arranged between the third dichroic mirror 16 and the micro-electromechanical mirror 18. The outgoing white light beam 19 is reflected to a position where the reflective surface 184 of the MEMS mirror 18 is adjacent to the rotation axis 182 . The white light beam 19 is reflected by the reflective surface 184 of the micro-electromechanical mirror 18 and further enters the light guide plate 20 through the fan-shaped column gap 25. Since the rotation axis 182 coincides with the central axis 252 of the fan-shaped column gap 25, the When the electromechanical mirror 18 reciprocates at a predetermined frequency within a certain angle range, the white light beam 19 reflected by the reflective surface 184 forms a reciprocating scanning beam in the light guide plate 20 , and the scanning beam passes through the light guide plate 20 further. Scattering, so as to transform into a uniform surface light source that is emitted from the light-emitting surface 22 .
请参阅图4，本发明提供另一实施方式的光源模块10a，该光源模块10a与光源模块10的结构类似，不同之处在于，该光源模块10a省略了光源模块的第一分色镜14，且该光源模块10a的第一激光源11a设置于该第二分色镜15a的远离该第三分色镜16a的一侧，且该第一激光源11a光出射方向平行于该第一侧面23和出光面22，且第一激光源11a发出的红色激光112a入射至该第二分色镜15a的位置与该第二激光源12a发出的绿色激光122a在该第二分色镜15a的反射点相同，从而在该红色激光112a透过该第二分色镜15a后与反射后的绿色激光122a混光，并一起入射至第三分色镜16a与由第三激光源13a发出的并由该第三分色镜16a反射的蓝色激光132a混光形成白光光束19a。Please refer to FIG. 4 , the present invention provides another embodiment of a light source module 10a, the light source module 10a is similar in structure to the light source module 10, the difference is that the light source module 10a omits the first dichroic mirror 14 of the light source module, And the first laser source 11a of the light source module 10a is arranged on the side of the second dichroic mirror 15a away from the third dichroic mirror 16a, and the light emitting direction of the first laser source 11a is parallel to the first side 23 and the light exit surface 22, and the red laser light 112a emitted by the first laser source 11a is incident on the position of the second dichroic mirror 15a and the green laser light 122a emitted by the second laser source 12a is at the reflection point of the second dichroic mirror 15a Same, so that after the red laser 112a passes through the second dichroic mirror 15a, it mixes with the reflected green laser 122a, and enters the third dichroic mirror 16a together with the light emitted by the third laser source 13a and is emitted by the third laser source 13a. The blue laser light 132a reflected by the third dichroic mirror 16a is mixed to form a white light beam 19a.
请参阅图5，本发明提供第三实施方式的光源模块10b，该光源模块10b与光源模块10a的结构类似，不同之处在于该光源模块10b的第二激光源12b设置于第一侧面23与第二分色镜15b之间，第三激光源13b设置于第一侧面23与第三分色镜16b之间，即，该第二激光源12b和第三激光源13b邻近于该第一侧面23，而第二分色镜15b和第三分色镜16b远离该第一侧面23。本实施例中，该第二分色镜15b和第三分色镜16b的反射面设置方向为将光源模块10a的第二分色镜15a和第三分色镜16a分别以垂直于第一侧面23的转轴逆时针旋转90度得到，该第二分色镜15b和第三分色镜16b的反射面分别可以使绿色激光122b和蓝色激光132b向该光路调整反射镜17的方向反射，并使红色激光112b、绿色激光122b和蓝色激光132b混光形成白光光束19b并入射至光路调整反射镜17。Please refer to FIG. 5 , the present invention provides a light source module 10b according to a third embodiment. The structure of the light source module 10b is similar to that of the light source module 10a, except that the second laser source 12b of the light source module 10b is arranged on the first side 23 and Between the second dichroic mirror 15b, the third laser source 13b is arranged between the first side 23 and the third dichroic mirror 16b, that is, the second laser source 12b and the third laser source 13b are adjacent to the first side 23, while the second dichroic mirror 15b and the third dichroic mirror 16b are away from the first side 23. In this embodiment, the reflective surfaces of the second dichroic mirror 15b and the third dichroic mirror 16b are arranged in such a way that the second dichroic mirror 15a and the third dichroic mirror 16a of the light source module 10a are respectively perpendicular to the first side surface The rotation axis of 23 is rotated 90 degrees counterclockwise to obtain that the reflective surfaces of the second dichroic mirror 15b and the third dichroic mirror 16b can respectively reflect the green laser light 122b and the blue laser light 132b in the direction of the optical path adjustment reflector 17, and The red laser light 112b, the green laser light 122b and the blue laser light 132b are mixed to form a white light beam 19b and enter the optical path adjustment mirror 17.
可以理解的是，图2中所示的光源模块10的第一激光源11、第二激光源12及第三激光源13也可以分别设置于该第一分色镜14、第二分色镜15及第三分色镜16与该第一侧面23之间，此时只需将该第一分色镜14、第二分色镜15及第三分色镜16的反射面逆时针旋转90度即可。同样可以理解，该第一激光源11、第二激光源12及第三激光源13的位置可以互换，即三原色激光源的位置可以互换，只要对应的分色镜的位置对应互换即可。另外，该光路调整反射镜17也可以省略，此时由该第三分色镜16出射的白光光束19可以直接入射至该微机电反射镜18。It can be understood that the first laser source 11, the second laser source 12 and the third laser source 13 of the light source module 10 shown in FIG. 15 and the third dichroic mirror 16 and the first side 23, now only need to rotate the reflective surfaces of the first dichroic mirror 14, the second dichroic mirror 15 and the third dichroic mirror 16 counterclockwise by 90 degree can be. It can also be understood that the positions of the first laser source 11, the second laser source 12 and the third laser source 13 can be interchanged, that is, the positions of the three primary color laser sources can be interchanged, as long as the positions of the corresponding dichroic mirrors are interchanged. Can. In addition, the optical path adjustment mirror 17 can also be omitted, and at this time, the white light beam 19 emitted by the third dichroic mirror 16 can directly enter the micro-electromechanical mirror 18 .
相对于现有技术，本实施例的背光模组100采用三原色激光源及分光镜进行混色，并由一微机电反射镜扫描反射混色后的白光光束，由于激光源体积和分光镜均可以做得较小，微机电反射镜的体积也较小，因此，使得光源模块的体积较小，采用该光源模块的背光模组100体积也较小，从而适合应用于小尺寸显示设备的背光模组。Compared with the prior art, the backlight module 100 of this embodiment adopts three primary color laser sources and beam splitters for color mixing, and a micro-electromechanical mirror scans and reflects the white light beam after color mixing, because both the volume of the laser source and the beam splitter can be made Smaller, the volume of the micro-electromechanical mirror is also small, so the volume of the light source module is small, and the volume of the backlight module 100 using the light source module is also small, so it is suitable for backlight modules used in small-sized display devices.
另外，本领域技术人员还可于本发明精神内做其它变化，以用于本发明等设计，只要其不偏离本发明的技术效果均可。这些依据本发明精神所做的变化，都应包含在本发明所要求保护的范围之内。In addition, those skilled in the art can also make other changes within the spirit of the present invention for use in the designs of the present invention, as long as they do not deviate from the technical effects of the present invention. These changes made according to the spirit of the present invention should be included in the scope of protection of the present invention.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310155037.7ACN104121520A (en) | 2013-04-29 | 2013-04-29 | Backlight module |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310155037.7ACN104121520A (en) | 2013-04-29 | 2013-04-29 | Backlight module |
| Publication Number | Publication Date |
|---|---|
| CN104121520Atrue CN104121520A (en) | 2014-10-29 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310155037.7APendingCN104121520A (en) | 2013-04-29 | 2013-04-29 | Backlight module |
| Country | Link |
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| CN (1) | CN104121520A (en) |
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