Liquid crystal display device

• US 8,184,241 B2
• Filed: 06/25/2008
• Issued: 05/22/2012
• Est. Priority Date: 06/29/2007
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Hitachi Displays Limited (Japan Display Incorporated), Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Inventors: Kubota, Hidenao, Yamada, Takahiro
• Primary Examiner(s): Robinson, Mark
• Assistant Examiner(s): BLEVINS, JERRY M
• Application Number:
  US12/213,852
• Publication Number:
  US 20090002607A1
• Time in Patent Office: 1,427 Days
• Field of Search: 349/96, 349/122, 349/138, 349/159, 349/42, 349/106, 428/1.5
• US Class Current: 349/96
• CPC Class Codes: C09K 2323/05 Bonding or intermediate layer characterised by chemical composition, e.g. sealant or spacer
• CPC Class Codes: G02F 1/1333 Constructional arrangements; Manufacturing methodsG02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/133331 Cover glasses
• CPC Class Codes: G02F 2201/50 Protective arrangements
• CPC Class Codes: G02F 2202/28 Adhesive materials or arrangements
• CPC Class Codes: H05K 1/189 characterised by the use of a flexible or folded printed circuit H05K3/326 takes precedence
• CPC Class Codes: H05K 2201/10106 Light emitting diode [LED]
• CPC Class Codes: H05K 2201/10136 Liquid Crystal display [LCD]

Abstract

The present invention mechanically protects a surface of a miniaturized liquid crystal display device for mobile phone or the like without deteriorating image quality and without increasing a thickness of a whole display device. To achieve such an object, in the present invention, a liquid crystal display panel is constituted of a TFT substrate and a color filter substrate, a lower polarizer is adhered to a lower surface of the TFT substrate, and an upper polarizer is adhered to an upper surface of the color filter substrate. A face plate is adhered to the upper polarizer using an acrylic adhesive material which is cured by ultraviolet rays. For enhancing strength and adhesion property of the face plate, corners and side portions of the face plate are chamfered. By making a profile of the face plate smaller than a profile of the upper polarizer, the adhesion property of the face plate is enhanced. The present invention can protect the surface of the liquid crystal display panel without deteriorating image quality and without largely increasing a thickness of the display device.

Claims

1. A liquid crystal display device including a liquid crystal display panel which has a TFT substrate on which pixel electrodes and TFTs for controlling signals to the pixel electrodes are arranged in a matrix array and a color filter substrate on which color filters corresponding to the pixel electrodes are formed, wherein

an upper polarizer is adhered to the color filter substrate, a face plate made of glass is adhered to the upper polarizer, and the face plate has a profile smaller than a profile of the upper polarizer, and

the upper polarizer and the face plate have an approximately rectangular shape, and the face plate is shorter than the upper polarizer by 0.5 mm or more with respect to a short-axis length and a long-axis length.