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Application filed by Au Optronics CorpfiledCriticalAu Optronics Corp
Priority to TW94102449ApriorityCriticalpatent/TWI259888B/en
Publication of TW200626835ApublicationCriticalpatent/TW200626835A/en
Application grantedgrantedCritical
Publication of TWI259888BpublicationCriticalpatent/TWI259888B/en
A backlight module is provided. The backlight module comprises a light source, a light guide and an optical layer. A surface of the light guide is coated with the optical layer. Light is emitted from the light source and enters the light guide through the optical layer. The refraction coefficient N of the optical layer is between the refraction coefficients Ns and N0 of the light guide and the air respectively.