Tung & Associates
Method for forming compact LCD packages and devices formed in which first bonding PCB to LCD panel and second bonding driver chip to PCB
A method for forming a compact LCD package and devices formed by such method are disclosed. In the method, an LCD display panel is formed by bonding an upper glass panel and a lower glass panel together and exposing an edge portion formed by a larger lower glass panel. Conductive traces formed of a conductive film layer such as ITO is provided on the edge portion of the LCD display panel for providing electrical connection to the drive lines and scan lines for the LCD panel. A two-step bonding method is used to first bond a printed circuit board in a pre-bonding step to the exposed edge portion of the LCD panel by using an anisotropic conductive film layer. The bonding is conducted under pressure and heat such that electrical communication is established through the conductive metal particles contained in the anisotropic conductive film. In a second, or post-bonding step, an IC chip or a driver chip is bonded to the top of the PCB by a multiplicity of solder bumps formed on the driver chip connecting electrically to a second multiplicity of conductive pads formed on top of the PCB substrate. The present invention novel method therefore produces a more compact LCD package which saves a planar area in an edge portion by at least 50%. In the first pre-bonding method that utilizes an anisotropic conductive film, fabrication equipment for an outer lead bonding method can be utilized. In the post-bonding step, fabrication equipment for an inner lead bonding method can be used.
Industrial Technology Research Institute
H H G
H05K H05K G02F
additional additional inventional
Hong-Yu Chin-Chen Yu-Chi Fang-I
Lin Yang Lee Shieh