Study On The Two-dimensional Distribution Law Of Micro-prism On The Bottom Surface Of Small Size Partial Integrated Light Guide Plate

Liquid crystal displays(LCDs)are widely applied in consumer electronics such as smart phones,tablet computers and on-board displays.The backlight module(BLM)is used as a high brightness and high uniformity surface light source for the LCD.There are some problems such as low utilization of light energy and high cost in the current typical BLM.The BLM gradually develops towards the direction of lightness and integration.Combined with the current industrial reproduction process,the partial integrated LGP(PILGP)was proposed earlier by our laboratory,which were composed of four films in the current typical BLM and separated from the RF.The distribution law of the micro-prism on the bottom surface of the PILGP was studied,and the one-dimensional distribution formula of the micro-prism on the bottom surface of the PILGP and the coefficient relationship expressions were established.Due to the onedimensional distribution of the micro-prism on the bottom surface of the PILGP,the large area uniformity of the width direction of the PILGP is caused,which affects the luminance uniformity of the BLM.In this paper,the influence of two-dimensional micro-structure distribution on the optical properties of the integrated BLM is discussed.The two-dimensional distribution expression of micro-prism on the bottom surface of the PILGP is established,and the coefficient relationship expression is obtained.A 5 inch PILGP with two-dimensional distribution of micro-prism on the bottom surface is developed.The main research results are as follows.(1)Aiming at the problem of large area identity of one-dimensional distribution of microstructure,the design idea of two-dimensional distribution of micro-structure on the bottom surface of the PILGP is proposed to make the overall luminance uniformity of the BLM further improved.An expression for the two-dimensional distribution of micro-prism on the bottom surface of the PILGP with small size is created,and the relationship between the distribution expression coefficients and the structural parameters of the PILGP such as the length and the width is obtained.The design time of the BLM is greatly saved(2)Above expressions are directly applied to the design of a 5 inch PILGP with twodimensional distribution of the micro-prism on the bottom surface.Compared with the 5 inch PILGP with one-dimensional distribution of the micro-prism on the bottom surface,the simulation results show that the illumination uniformity and luminance uniformity are improved.From the illuminance and luminance diagram,some dark areas and bright stripes are eliminated,and the overall luminance uniformity is improved.It verifies that the design idea and expressions for two-dimensional distribution of micro-prism are feasible.(3)A 5 inch PILGP sample with two-dimensional distribution of micro-prism on the bottom surface is developed.According to the fabrication technique,the theoretical design parameters of the PILGP sample are adjusted and re-simulated.Compared with the simulation results of the measured parameters of the fabricated samples,the influence of the base angles of the micro-prism on the illuminance uniformity and luminance uniformity of the emitted light are analyzed.