Patent ID: 7213946

Claim:
A backlight module of a directly lighting backlight device comprising: a casing; at least one S shape lamp tube; a single flat reflecting sheet positioned below the lamp tube; a guide plate; the reflecting sheet reflecting light from the lamp tube with a predetermined angle to the guide plate above the lamp tube; the guide plate having the effect of diffusing the light to various angles by a pattern on the guide plate or diffusion agents in a diffuser; whole reflection being not formed so that light emits out from a front surface of the guide plate so that the guide plate reflects light uniformly; the diffuser receiving the uniform distributed light; the diffuser being above the guide plate; by using the diffuser, the distribution of the light will become more uniform; and at least one light enhancing sheet; light diffused by the diffuser will further radiate to the at least one light enhancing sheet for defracting the light to a liquid crystal panel; wherein each S shape lamp tube has three approximate parallel tubes and two cambered tubes; each cambered tube having no straight section; each cambered tube serves to connect two adjacent approximate parallel tubes; wherein an upper end of the light enhancing sheet is further added with a diffuser or a reflecting polarizing sheet; and wherein there are two light enhancing sheets, one is a horizontal prism sheet and the other is a vertical prism sheet.