TWI457050B - Backlight module and liquid crystal display - Google Patents

Claims (14)

A backlight module for providing a surface light source required for a liquid crystal display panel, comprising: n first transformers, a primary side of the n first transformers collectively receiving a first driving signal; and n first lamps The first end of the i-th first tube is coupled to the first end of the secondary side of the i-th first transformer, and the second end of the i-th first tube is coupled to the i+1th first transformer The second end of the second side of the second first tube is coupled to the first end of the second side of the nth first transformer, and the second end of the nth first tube is coupled The second end of the secondary side of the first first transformer, wherein n and i are positive integers and n is greater than i. The backlight module of claim 1, further comprising: n second transformers, wherein the primary side of the n second transformers jointly receive a second driving signal; n second tubes, the ith The first end of the second lamp is coupled to the first end of the secondary side of the i-th second transformer, and the second end of the i-th second tube is coupled to the secondary side of the i+1th second transformer The second end of the nth second tube is coupled to the first end of the secondary side of the nth second transformer, and the second end of the nth second tube is coupled to the first end a second end of the secondary side of the second transformer; and a current divider, the first end of the primary side of the current comparator receives the first driving signal, and the second end of the primary side of the current transformer is coupled to the second end a primary side of the n first transformers, the first end of the secondary side of the current comparator receives the second driving signal, and the second end of the secondary side of the current transformer is coupled to the n second transformers On the side, the current transformer is configured to adjust the current of the primary side of the n first transformers to be the same as the current of the primary side of the n second transformers. The backlight module of claim 2, wherein the first driving signal and the second driving signal are provided by an inverter. The backlight module of claim 2, wherein the first driving signal is the same as the second driving signal. The backlight module of claim 2, wherein the primary side and the secondary side of the n first transformers have the same polarity, and the primary side and the secondary side of the n second transformers have the same polarity. The backlight module of claim 2, wherein the current transformer is a transformer. The backlight module of claim 6, wherein the primary side and the secondary side of the current transformer are different in polarity. A liquid crystal display device includes: a liquid crystal panel; a backlight module, wherein the liquid crystal panel is disposed on one side of the backlight module, the backlight module includes: n first transformers, and one of the n first transformers The first side of the second first tube is coupled to the first end of the secondary side of the i-th first transformer, the first one is the first one. The second end of the first tube is coupled to the second end of the second side of the i+1th first transformer, and the first end of the nth first tube is coupled to the second side of the nth first transformer At one end, the second end of the nth first tube is coupled to the second end of the secondary side of the first first transformer, where n and i are positive integers, and n is greater than i. The liquid crystal display device of claim 8, wherein the backlight module further comprises: n second transformers, wherein the primary sides of the n second transformers jointly receive a second driving signal; n second lamps The first end of the ith second tube is coupled to the first end of the secondary side of the i-th second transformer, and the second end of the ith second tube is coupled to the i+1th second a second end of the secondary side of the transformer, the first end of the nth second tube is coupled to the first end of the secondary side of the nth second transformer, and the second end of the nth second tube is coupled a second end of the secondary side of the first second transformer; and a current divider, the first end of the primary side of the current comparator receiving the first driving signal, the first side of the current comparator The second end is coupled to the primary side of the n first transformers, the first end of the secondary side of the current comparator receives the second driving signal, and the second end of the secondary side of the current transformer is coupled to the n a primary side of the second transformer, the current transformer is configured to adjust a current of a primary side of the n first transformers and a current of a primary side of the n second transformers to a phase . The liquid crystal display device of claim 9, wherein the first driving signal and the second driving signal are provided by an inverter. The liquid crystal display device of claim 9, wherein the first driving signal is the same as the second driving signal. The liquid crystal display device according to claim 9, wherein the primary side and the secondary side of the n first transformers have the same polarity, and the primary side and the secondary side of the n second transformers have the same polarity. The liquid crystal display device of claim 9, wherein the current transformer is a transformer. The liquid crystal display device of claim 13, wherein the primary side and the secondary side of the current transformer are of opposite polarity.