液晶显示领域不断提出缩减成本方案，对于液晶电视LED背光系统，提出了一种大角度背光透镜设计方案，即在目标接收屏面具有较大照度辐射角度的背光透镜设计。采用特定的双自由曲面设计，入光孔设置为类椭圆型结构面将光源出射的光通量进行等角度划分，根据接收屏面的理想照度分布与入光孔每一角度出射光通量对应关系计算出出光面自由曲线。借助底部微结构处理，再根据模具及产品成型要求补全外观结构，得到符合设计指标的方案，有效地解决了因增大角度引起的黄斑问题，并达到目标接受面均匀度的要求。针对32英寸(81 cm)的液晶电视背光模组，采用12颗最大正向电流为350 mA的LED灯珠，在模组高度为30 mm的系统中，设计的背光透镜模组达到了要求的亮度及均匀度。

Cost-cutting schemes have been proposed more and more in liquid crystal display (LCD) display field. Aiming at the backlight system of LCD-TV, a large angle backlight lens design was proposed. Using a specific double-free surface design, the first hole is set to be elliptic structural surface, which could classify the emergence luminous flux from light source as equal angle. Based on the corresponding relationship between the ideal illumination distribution of receiving screen surface and the exiting luminous flux of every angle of the first hole, the free-form curve of light emitting surface was calculated. Then by means of microstructure processing at the bottom and according to the requests of mould and molding product,the appearance structure was completed, and finally the scheme meeting the design index was achieved,which could effectively solve the macular problem caused by increased angle and satisfy the evenness requirement for target receiving surface. For a 32 inch LCD-TV backlight module, 12 LED lamp beads with the max forward current of 350 mA were utilized, in the system with the module height of 30 mm, the designed backlight lens module could match the demands of brightness and uniformity.