技术领域technical field
本发明涉及直下式背光领域，尤其涉及的是一种复合型直下式背光模组。The invention relates to the field of direct-lit backlights, in particular to a composite direct-lit backlight module.
背景技术Background technique
当下直下式背光模组的发展趋势为超薄、高亮。如图1所示，现有的一种超薄型直下式背光模组，包括：扩散板、膜片12、反射片10、透镜13等。目前直下式背光模组虽然可以实现较薄的造型，但是因受限于成本、设计空间以及透镜技术的限制，其造型越来越薄、收边越来越靠里，即混光距离及收边角变小，使得其底面面积变小，从而导致直下式背光模组的LED数量越来越少，同时LED到角落的光成变长，要在直下式背光模组上实现高亮度指标，只能依赖高成本的光学膜片，如棱镜片、DBEF等，一方面，膜片提升亮度的作用有限，远达不到定级标准，另一方面，随着混光距离和LED数量的减少，LED间距加大，光学透镜混光作用部分失效，会呈现出不均匀失效以及严重的暗角，所以，现有的直下式背光模组还存在视效差、亮度低、成本高、品质不稳定的不足，需要一种更优的直下式背光设计方案。The current development trend of direct-lit backlight modules is ultra-thin and bright. As shown in FIG. 1 , an existing ultra-thin direct type backlight module includes: a diffuser plate, a diaphragm 12 , a reflection sheet 10 , a lens 13 and the like. Although the current direct-type backlight module can achieve a thinner shape, due to the limitations of cost, design space and lens technology, its shape is getting thinner and its edge is getting closer, that is, the light mixing distance and the shrinkage The smaller the corners, the smaller the area of the bottom surface, resulting in fewer and fewer LEDs in the direct-type backlight module, and at the same time, the light from the LED to the corner becomes longer. To achieve high brightness indicators on the direct-type backlight module, Can only rely on high-cost optical film, such as prism film, DBEF, etc. On the one hand, the effect of the film on improving brightness is limited, far from reaching the grading standard; on the other hand, with the reduction of the light mixing distance and the number of LEDs , the distance between the LEDs increases, and the light mixing effect of the optical lens partially fails, resulting in uneven failure and serious vignetting. Therefore, the existing direct-lit backlight modules still have poor visual effects, low brightness, high cost, and poor quality. Insufficient stability requires a better direct-lit backlight design.
因此，现有技术还有待于改进和发展。Therefore, the prior art still needs to be improved and developed.
发明内容Contents of the invention
本发明要解决的技术问题在于，针对现有技术的上述缺陷，提供一种复合型直下式背光模组，具有画质均匀、亮度高、成本较低并且节约了大量空间的优点。The technical problem to be solved by the present invention is to provide a composite direct type backlight module with the advantages of uniform picture quality, high brightness, low cost and saving a lot of space, aiming at the above-mentioned defects of the prior art.
本发明解决技术问题所采用的技术方案如下：一种复合型直下式背光模组，包括：直下式背光模组；设于所述直下式背光模组侧面的一组或多组侧入式背光模组模块；所述直下式背光模组包括：导光扩散板，所述导光扩散板包括设于所述导光扩散板上半部的呈乳白色的扩散层以及设于所述导光扩散板下半部的呈透明的导光层；设于所述导光扩散板下方的、供所述导光扩散板以及侧入式背光模组模块安装的背板；以及，设于所述背板上朝向所述导光扩散板一面的直下式LED灯条以及反射片。The technical solution adopted by the present invention to solve the technical problem is as follows: a composite direct-type backlight module, comprising: a direct-type backlight module; Module module; the direct-type backlight module includes: a light guide diffusion plate, the light guide diffusion plate includes a milky white diffusion layer arranged on the half of the light guide diffuser plate and a light guide diffusion layer arranged on the light guide diffusion plate a transparent light guide layer in the lower half of the board; a back plate arranged under the light guide diffuser plate for installation of the light guide diffuser plate and side-entry backlight module modules; and a back plate arranged on the back A direct-type LED light bar and a reflective sheet facing the side of the light guiding and diffusing plate on the board.
进一步地，所述侧入式背光模组模块包括设于所述导光扩散板侧面的侧入式LED灯条以及设于所述侧入式LED灯条上的一垫块。Further, the side-entry backlight module module includes a side-entry LED light bar arranged on the side of the light-guiding diffuser plate and a spacer provided on the side-entry LED light bar.
进一步地，所述垫块接触于所述导光层的入光面，所述侧入式LED灯条的发光面正对于所述导光扩散板下半部的入光侧端面。Further, the spacer is in contact with the light-incident surface of the light-guiding layer, and the light-emitting surface of the side-in LED light bar is directly opposite to the light-incident side end surface of the lower half of the light-guiding diffusion plate.
进一步地，所述垫块的高度比LED高出0.2~0.5mm。Further, the height of the spacer is 0.2-0.5 mm higher than that of the LED.
进一步地，所述扩散层上表面为粗糙结构面，所述导光层下表面为网点面，所述网点面上设有呈半球状的外凸网点，所述扩散层与所述导光层通过感光UV胶层粘接。Further, the upper surface of the diffusion layer is a rough structure surface, the lower surface of the light guide layer is a dot surface, and the dot surface is provided with hemispherical convex dots, and the diffusion layer and the light guide layer Adhesive through photosensitive UV adhesive layer.
进一步地，所述导光层的入光面与所述侧入式LED灯条正对，所述入光面根据亮度大小设为单侧、双侧或四测入光，所述导光层除入光面外其他端面贴附有遮光胶带。Further, the light-incident surface of the light-guiding layer is directly opposite to the side-entry LED light bar, and the light-incident surface is set as one-side, two-side or four-side incident light according to the brightness, and the light-guide layer Except for the light incident surface, other end surfaces are attached with light-shielding tape.
进一步地，所述背板上端面两端向上延伸有一垂直于所述背板上端面的、供所述侧入式LED灯条折边，所述导光扩散板设于所述背板顶层平台上，与所述背板形成一腔体。Further, both ends of the top surface of the backplane extend upwards and are perpendicular to the top surface of the backplane for folding the side-entry LED light strips, and the light guide diffusion plate is arranged on the top platform of the backplane and forming a cavity with the back plate.
进一步地，所述背板靠近所述导光扩散板一面设有反射片；所述腔体底面设有用于承载所述导光扩散板的支撑柱，所述支撑柱呈倒置的“T”状，其柱体呈锥形且接触于所述导光层的网点面。Further, a reflection sheet is provided on the side of the back plate close to the light guide diffusion plate; a support column for carrying the light guide diffusion plate is provided on the bottom surface of the cavity, and the support column is in an inverted “T” shape , the cylinder of which is tapered and is in contact with the dot surface of the light guiding layer.
一种导光扩散板，所述导光扩散板包括设于所述导光扩散板上半部的呈乳白色的扩散层以及设于所述导光扩散板下半部的呈透明的导光层，所述扩散层与所述导光层通过感光UV胶层粘接。A light guide diffuser plate, the light guide diffuser plate includes a milky white diffusion layer arranged on the half of the light guide diffuser plate and a transparent light guide layer arranged on the lower half of the light guide diffuser plate , the diffusion layer is bonded to the light guide layer through a photosensitive UV adhesive layer.
进一步地，所述扩散层上表面为粗糙结构面，所述导光层下表面为网点面，所述网点面上设有呈凸起的半球状的外凸网点。Further, the upper surface of the diffusion layer is a surface with a rough structure, the lower surface of the light guide layer is a dot surface, and the dot surface is provided with raised hemispherical dots.
综上所述，本发明所提供的一种复合型直下式背光模组，具有以下有益效果：除了直下式背光模组的一般架构外，还兼容了侧入式背光模组模块，二者能量相叠加，在不用膜片与透镜的前提下即可轻松实现超高亮度指标，导光扩散板下表面的网点与上表面的结构面相配合，可以将LED的点光源转换为均匀的面光源出射，实现均匀画质，这样一来，既实现了超薄直下式产品的均匀画质，又实现了高亮度的参数指标，并且在简化工艺、缩短开发周期的同时降低了生产成本。To sum up, the composite direct-type backlight module provided by the present invention has the following beneficial effects: In addition to the general structure of the direct-type backlight module, it is also compatible with the side-type backlight module module, and the energy of the two Superimposed on each other, ultra-high brightness indicators can be easily achieved without the use of diaphragms and lenses. The dots on the lower surface of the light guide and diffusion plate cooperate with the structural surface on the upper surface, which can convert the point light source of the LED into a uniform surface light source. , to achieve uniform image quality. In this way, it not only realizes the uniform image quality of ultra-thin direct type products, but also realizes the parameter index of high brightness, and reduces the production cost while simplifying the process and shortening the development cycle.
附图说明Description of drawings
图1是现有的一种超薄型直下式背光模组示意图；FIG. 1 is a schematic diagram of an existing ultra-thin direct type backlight module;
图2 是本发明中一种复合型直下式背光模组截面示意图；Fig. 2 is a schematic cross-sectional view of a composite direct type backlight module in the present invention;
图3是图2中导光扩散板的剖面示意图；Fig. 3 is a schematic cross-sectional view of the light-guiding diffusion plate in Fig. 2;
图4是图3中导光扩散板的原理示意图；Fig. 4 is a schematic diagram of the principle of the light guide diffusion plate in Fig. 3;
图5是单侧入光的导光层网点分布示意图；Fig. 5 is a schematic diagram of the dot distribution of the light guide layer with light incident from one side;
图6是双侧或四侧入光的导光层网点分布示意图。Fig. 6 is a schematic diagram of dot distribution of the light guide layer with double-side or four-side light incident.
附图标记reference sign
1、背板；2、导光扩散板；21、扩散层；22、导光层；3、直下式LED灯条；4、侧入式LED灯条；5、粗糙结构面；6、网点面；7、外凸网点；8、支撑柱；9、UV胶层；10、反射片；11、折边；12、膜片；13、透镜。1. Back panel; 2. Light guide diffusion plate; 21. Diffusion layer; 22. Light guide layer; 3. Direct-type LED light bar; 4. Side-entry LED light bar; 5. Rough structure surface; 6. Dot surface ; 7. Convex dots; 8. Support column; 9. UV adhesive layer; 10. Reflector; 11. Hem; 12. Diaphragm;
具体实施方式Detailed ways
为使本发明的目的、技术方案及优点更加清楚、明确，以下参照附图并举实施例对本发明进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。In order to make the object, technical solution and advantages of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
如图2与图3所示，一种复合型直下式背光模组，包括直下式背光模组以及设于直下式背光模组侧面的一组或多组侧入式背光模组模块。As shown in FIG. 2 and FIG. 3 , a composite direct-type backlight module includes a direct-type backlight module and one or more sets of side-type backlight module modules arranged on the side of the direct-type backlight module.
直下式背光模组包括导光扩散板2以及设于该导光扩散板2下方的背板1，导光扩散板2与侧入式背光模组模块安装于背板1上，还包括设于背板1上朝向导光扩散板2一面的直下式LED灯条3以及反射片10；导光扩散板2为聚苯乙烯材质，该导光扩散板2包括设于导光扩散板2上半部的呈乳白色的扩散层21以及设于导光扩散板2下半部的呈透明的导光层22。The direct-type backlight module includes a light-guiding diffusion plate 2 and a backplane 1 located below the light-guiding diffusion plate 2. The direct-type LED light bar 3 and the reflection sheet 10 facing the light guide diffusion plate 2 on the back plate 1; the light guide diffusion plate 2 is made of polystyrene, and the light guide diffuser plate 2 includes The milky white diffusion layer 21 on the upper portion and the transparent light guide layer 22 provided on the lower half of the light guide diffusion plate 2 .
结合图4，直下式LED灯条3的光入射到导光层22，部分光能经导光层22的反射作用返回到混光腔体，部分光能穿过导光层22，再经扩散层21的扩散最终出射形成均匀的光能分布；返回混光腔体的光能经反射片10的反射作用再次向上传输，循环以上过程；由于PS（聚苯乙烯）的折射率远大于空气，侧入式背光模组模块的光能进入导光层22后原本会进行全反射，导光层22底面会破坏全反射，使光能进入扩散层21，再经扩散层21的折射和散射作用，形成均匀的光能分布；直下式LED灯条3和侧入式背光模组模块的光能会在扩散层21最终叠加，共同形成出射光能。Referring to Figure 4, the light from the direct-type LED light bar 3 is incident on the light guide layer 22, part of the light energy returns to the light mixing cavity through the reflection of the light guide layer 22, and part of the light energy passes through the light guide layer 22, and then diffuses The diffusion of layer 21 finally emerges to form a uniform light energy distribution; the light energy returned to the light mixing cavity is transmitted upwards again through the reflection of the reflector 10, and the above process is repeated; since the refractive index of PS (polystyrene) is much larger than that of air, The light energy of the side-entry backlight module module will undergo total reflection after entering the light guide layer 22, but the bottom surface of the light guide layer 22 will destroy the total reflection, so that the light energy enters the diffusion layer 21, and then undergoes refraction and scattering by the diffusion layer 21 , to form a uniform distribution of light energy; the light energy of the direct-type LED light bar 3 and the side-type backlight module module will finally be superimposed on the diffusion layer 21 to form outgoing light energy together.
导光层22为纯聚苯乙烯材质，而扩散层21均匀掺入扩散剂成分，从而使得扩散层21对光线具有极强的扩散性。The light guide layer 22 is made of pure polystyrene, and the diffusion layer 21 is uniformly mixed with diffusing agent components, so that the diffusion layer 21 has a strong diffusivity for light.
扩散层21上表面为粗糙结构面5，该粗糙结构面5为磨砂面，使得增强了扩散层21对光能的扩散性，导光层22下表面为网点面6，网点面6上设有呈半球状的外凸网点7，网点面6一方面具有破坏导光层22中光线的全反射作用，使光线进入扩散层21中，此外，对下方直下式LED灯条3的光线起到折射作用，将原本规律分布的光能打散，有助于形成均匀视效，通过网点面6与粗糙结构面5相结合，可以将LED的点光源转换为均匀的面光源出射，从而在扩散层21和导光层22的双重作用下，从而可以去掉传统直下式背光模组中的透镜13和膜片12。The upper surface of the diffusion layer 21 is a rough structure surface 5, and the rough structure surface 5 is a frosted surface, so that the diffusivity of the diffusion layer 21 to light energy is enhanced, and the lower surface of the light guide layer 22 is a dot surface 6, on which there is a The hemispherical convex dots 7 and the dot surface 6 have the function of destroying the total reflection of the light in the light guide layer 22 on the one hand, so that the light enters the diffusion layer 21, and in addition, refract the light of the direct-down LED light bar 3 below. The effect is to disperse the light energy that is originally distributed regularly, which is helpful to form a uniform visual effect. Through the combination of the dot surface 6 and the rough structure surface 5, the point light source of the LED can be converted into a uniform surface light source to emit, so that in the diffusion layer 21 and the light guide layer 22, the lens 13 and film 12 in the traditional direct-lit backlight module can be removed.
扩散层21与导光层22通过感光UV胶层9粘接，因感光胶折射率较低，不会影响光线进入扩散层21。The diffusion layer 21 and the light guide layer 22 are bonded by the photosensitive UV adhesive layer 9 , because the refractive index of the photosensitive adhesive is low, it will not affect the light entering the diffusion layer 21 .
侧入式背光模组模块包括设于导光扩散板2侧面的侧入式LED 灯条4以及设于侧入式LED 4灯条上的一垫块，导光层22的入光面与侧入式LED 灯条4正对，入光面可根据亮度大小设为单侧、双侧或四测入光，导光层22除入光面外其他端面贴附有遮光胶带，从而可以防止漏光以达到提高亮度的目的。The side-entry backlight module module includes a side-entry LED light bar 4 arranged on the side of the light-guiding diffuser plate 2 and a cushion block arranged on the side-entry LED 4 light bar. The built-in LED light bar 4 faces directly, and the light incident surface can be set to one side, two sides or four sides according to the brightness, and the light guide layer 22 is attached with a light-shielding tape on the other end surfaces except the light incident surface, so as to prevent light leakage In order to achieve the purpose of increasing brightness.
垫块接触于导光层22的入光面，侧入式LED 灯条4的发光面正对于导光扩散板2下半部的入光侧端面，以达到防止漏光的目的，进一步提高了亮度。The spacer is in contact with the light-incident surface of the light guide layer 22, and the light-emitting surface of the side-entry LED light bar 4 is facing the light-incident side end surface of the lower half of the light guide diffuser plate 2, so as to prevent light leakage and further improve the brightness .
背板1上端面两端向上延伸有一垂直于背板1上端面的、供侧入式LED 灯条4安装的折边11，导光扩散板2固定于背板1顶层平台上，与背板1形成一腔体。Both ends of the upper end surface of the backplane 1 extend upwards and have a folded edge 11 perpendicular to the upper end surface of the backplane 1 for the installation of the side-entry LED light bar 4. The light guide diffusion plate 2 is fixed on the top platform of the backplane 1, and 1 to form a cavity.
腔体底面设有用于承载导光扩散板2的支撑柱8，支撑柱8呈倒置的“T”状，其柱体呈锥形且接触于导光层22的网点面6，一方面加强了导光扩散板2与背板1之间的稳定性，另一方面减轻了对光反射的干扰。The bottom surface of the cavity is provided with a support column 8 for carrying the light guide diffusion plate 2. The support column 8 is in an inverted "T" shape, and its column is tapered and contacts the dot surface 6 of the light guide layer 22. The stability between the light guide diffuser plate 2 and the back plate 1, on the other hand, reduces the interference to light reflection.
进一步地，垫块的高度比LED高出0.2~0.5mm，导光扩散板2常用的厚度劈2mm、1.8mm、1.5mm、1.2mm、1mm、0.8mm，但不仅限于这些厚度，出于可靠性的因素考量，58英寸（含58英寸）以上采用1.8mm或2mm厚度，43英寸-55英寸采用1.2mm或1.5mm厚度，32英寸-43英寸采用1mm厚度，一般情况下，导光层22厚度（含外凸网点7）和扩散层21厚度对等，根据实际情况可做灵活调整，如果视效均匀需增加亮度，可以适当减薄扩散层21加厚导光层22；如果亮度足够需要提升视效，可以适当减薄导光层22加厚扩散层21。Further, the height of the spacer is 0.2~0.5mm higher than that of the LED, and the commonly used thicknesses of the light guide diffuser plate 2 are 2mm, 1.8mm, 1.5mm, 1.2mm, 1mm, 0.8mm, but not limited to these thicknesses, for reliability In consideration of performance factors, the thickness of 1.8mm or 2mm is used for more than 58 inches (including 58 inches), the thickness of 1.2mm or 1.5mm is used for 43 inches to 55 inches, and the thickness of 1mm is used for 32 inches to 43 inches. In general, the light guide layer 22 The thickness (including the convex dots 7) is equal to the thickness of the diffusion layer 21, which can be flexibly adjusted according to the actual situation. If the visual effect needs to be increased to increase the brightness, the diffusion layer 21 can be appropriately thinned and the light guide layer 22 can be thickened; if the brightness is sufficient, it is necessary To improve the visual effect, the light guide layer 22 can be appropriately thinned and the diffusion layer 21 can be thickened.
如图5所示，该图为单侧入光的导光层22外凸网点7分布示意图，横轴表示外凸网点7的相对位置，纵轴表示外凸网点7的直径，以入光侧的起始外凸网点7为原点，以平行入射光方向的外凸网点7直径作图即得到如图所示的类高斯平滑曲线，为了得到最佳的光学分布，平行于入射光方向的一条直线上，外凸网点7直径分布应该满足函数方程：Φ=A*X^B+C，其中X为外凸网点7的坐标，C为最小外凸网点7直径，A、B为曲线设计参数，导光层22外凸网点7为模具一次成型，C最小可取值到0.1mm左右，为了平衡导光层22入光侧和出光侧的能量分布且使中心亮度最大化，将出光侧的外凸网点7分布曲线局部微调下拉，形成“勺子尾”。As shown in Figure 5, this figure is a schematic diagram of the distribution of the convex dots 7 of the light guide layer 22 with one-sided light input, the horizontal axis represents the relative position of the convex dots 7, and the vertical axis represents the diameter of the convex dots 7, with the light incident side The initial convex dot 7 is the origin, and the diameter of the convex dot 7 parallel to the incident light direction is plotted to obtain a Gaussian smooth curve as shown in the figure. In order to obtain the best optical distribution, a line parallel to the incident light direction On a straight line, the diameter distribution of convex dots 7 should satisfy the functional equation: Φ=A*X^B+C, where X is the coordinates of convex dots 7, C is the smallest diameter of convex dots 7, and A and B are curve design parameters , the outer convex dots 7 of the light guide layer 22 are molded at one time, and the minimum value of C is about 0.1 mm. The distribution curve of convex dots 7 is partially fine-tuned and pulled down to form a "spoon tail".
如图6所示，该图为双侧或四侧入光的导光层22外凸网点7分布示意图，以一入光侧的起始外凸网点7为原点，以平行入射光方向的外凸网点7直径作图即得到如图5所示的对称平滑曲线，单边曲线应满足函数方程Φ=A*X^B+C，中间部分需进行局部微调，以保证平滑过度。As shown in Figure 6, this figure is a schematic diagram of the distribution of the convex dots 7 of the light guide layer 22 with double-side or four-side incident light, with the initial convex dots 7 on the light-incident side as the origin, and the outer convex dots 7 parallel to the incident light direction. Convex dot 7 diameter drawing can obtain the symmetrical smooth curve as shown in Figure 5, the unilateral curve should satisfy the function equation Φ=A*X^B+C, and the middle part needs to be fine-tuned locally to ensure smooth transition.
综上所述，直下式LED灯条3的光入射到导光层22的外凸网点7区域，部分光能经外凸网点7的反射作用返回到混光腔体，部分光能穿过导光层22，再经扩散层21的扩散最终出射形成均匀的光能分布，返回混光腔体的光能经反射片10的反射作用再次向上传输，循环以上过程；侧入式LED 灯条4 的光能进入导光层22后原本会进行全反射，底面外凸网点7会破坏全反射，使光能进入扩散层21，再经扩散层21的折射和散射作用，形成均匀的光能分布，除了直下式背光模组的一般架构外，兼容了一个侧入式背光模组模块，直下式LED3和侧入式LED 灯条4 的光能会在扩散层21最终叠加，共同形成出射光能，既实现了超薄直下式产品的均匀画质，又实现了高亮度的参数指标，并且在简化工艺、缩短开发周期的同时降低了生产成本。To sum up, the light of the direct-type LED light bar 3 is incident on the area of the convex dots 7 of the light guide layer 22, part of the light energy returns to the light mixing cavity through the reflection of the convex dots 7, and part of the light energy passes through the light guide layer 22. The light layer 22 is diffused by the diffusion layer 21 and finally emitted to form a uniform light energy distribution, and the light energy returned to the light mixing cavity is transmitted upward again by the reflection of the reflector 10, and the above process is repeated; side-entry LED light bar 4 After the light energy enters the light guide layer 22, it will undergo total reflection, and the convex dots 7 on the bottom surface will destroy the total reflection, so that the light energy enters the diffusion layer 21, and then the refraction and scattering of the diffusion layer 21 form a uniform light energy distribution. , in addition to the general structure of the direct-type backlight module, it is compatible with a side-type backlight module module, and the light energy of the direct-type LED 3 and the side-type LED light bar 4 will finally be superimposed on the diffusion layer 21 to jointly form the outgoing light energy , which not only realizes the uniform image quality of ultra-thin direct type products, but also realizes the parameter index of high brightness, and reduces the production cost while simplifying the process and shortening the development cycle.
应当理解的是，本发明的应用不限于上述的举例，对本领域普通技术人员来说，可以根据上述说明加以改进或变换，所有这些改进和变换都应属于本发明所附权利要求的保护范围。It should be understood that the application of the present invention is not limited to the above examples, and those skilled in the art can make improvements or transformations according to the above descriptions, and all these improvements and transformations should belong to the protection scope of the appended claims of the present invention.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810531011.0ACN108897091B (en) | 2018-05-29 | 2018-05-29 | Compound straight following formula backlight unit |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810531011.0ACN108897091B (en) | 2018-05-29 | 2018-05-29 | Compound straight following formula backlight unit |
| Publication Number | Publication Date |
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| CN108897091Atrue CN108897091A (en) | 2018-11-27 |
| CN108897091B CN108897091B (en) | 2021-06-01 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810531011.0AActiveCN108897091B (en) | 2018-05-29 | 2018-05-29 | Compound straight following formula backlight unit |
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