LIQUID CRYSTAL DISPLAY DEVICE

• US 20150192814A1
• Filed: 03/20/2015
• Published: 07/09/2015
• Est. Priority Date: 09/24/2012
• Status: Abandoned Application

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: KOSUGI, Naoki, INOUE, Manabu, NAKAYAMA, Takahito, KASAHARA, Shigeo, KADO, Hiroyuki, TOKAI, Akira, TAKAGI, Kazushige
• Application Number:
  US14/664,195
• Publication Number:
  US 20150192814A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/134318 having a patterned common electrode
• CPC Class Codes: G02F 1/136209 Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element
• CPC Class Codes: G02F 1/136218 Shield electrodes
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G06F 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

An object of the present technology is to provide an input device as a capacitance coupling type input device capable of easily being incorporated into a display device. A liquid crystal display device of the present technology includes: a liquid crystal panel 1 having a plurality of pixel electrodes 19 and a common electrode provided so as to be opposed to the pixel electrodes 19, and updating a display by sequentially applying a scanning signal to TFTs that control application of a voltage to the pixel electrodes 19; and an input device having a plurality of driving electrodes 11, which are formed by dividing the common electrode of the liquid crystal panel 1 by providing a slit 25, and a plurality of detection electrodes 12 arranged so as to cross the driving electrodes 11, and capacitive elements formed between the driving electrodes 11 and the detection electrodes 12. A shielding electrode 26 is arranged at a position corresponding to the slit 25 in the periphery of the pixel electrodes 19.

Claims

1. A liquid crystal display device, comprising:

a liquid crystal panel having a plurality of pixel electrodes and a common electrode provided so as to be opposed to the pixel electrodes, and updating a display by sequentially applying a scanning signal to switching elements that control application of a voltage to the pixel electrodes; and

an input device having a plurality of driving electrodes formed in the liquid crystal panel and a plurality of detection electrodes arranged so as to cross the driving electrodes, and capacitive elements formed between the driving electrodes and the detection electrodes,

wherein, in the input device, the driving electrodes are formed by dividing the common electrode of the liquid crystal panel by providing a slit at a position corresponding to the periphery of the pixel electrodes, and

a shielding electrode is arranged at a position corresponding to the slit.

2. The liquid crystal display device according to claim 1, wherein the shielding electrode is set at the same potential as that of a voltage applied to the common electrode.