# US 2014/0152932 A1 · Liquid crystal display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0152932 A1 - Document ID: US20140152932A1 - Status: Published application - Kind: A1 - Application number: 14/080,034 - Filed: 2013-11-14 - Published: 2014-06-05 - Earliest claimed: 2012-11-30 - Assignees: Semiconductor Energy Laboratory Co., Ltd. - Applicants: Semiconductor Energy Laboratory Co., Ltd. - Inventors: Hiroyuki MIYAKE - Web page: https://patentgrep.com/patent/US20140152932A1 ## CPC - G02F 1/136213: {Storage capacitors associated with the pixel electrode} - G09G 3/3655: {Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors} - G02F 1/134372: {for fringe field switching [FFS] where the common electrode is not patterned} - G09G 3/3614: {Control of polarity reversal in general} - G09G 2300/0876: Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS - G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00) ## Abstract A liquid crystal display device preventing flicker. The liquid crystal display device includes a plurality of pixels each having a transistor, a liquid crystal element to which a first signal and a second signal having opposite polarities are alternately applied through the transistor, and a capacitor including a first electrode and a second electrode. The liquid crystal element includes a pixel electrode and a common electrode partly overlapping with each other with an insulating film interposed therebetween, and a liquid crystal layer over the pixel electrode and the common electrode. The first electrode of the capacitor is electrically connected to the pixel electrode. The potential of the second electrode changes between a first potential and a second potential having different levels after the first signal is applied until the second signal is applied, whereby a change in the voltage applied to the liquid crystal layer is reduced. ## Claims ### Claim 1 A liquid crystal display device comprising: a pixel comprising: a transistor; a liquid crystal element including a pixel electrode, a common electrode, and a liquid crystal layer over the pixel electrode and the common electrode, wherein a first signal and a second signal having opposite polarities are alternately supplied to the pixel electrode through the transistor; and a capacitor including a first electrode and a second electrode, wherein the pixel electrode and the common electrode partly overlap with each other with an insulating film interposed therebetween, wherein the first electrode is electrically connected to the pixel electrode, and wherein the second electrode is connected to a wiring to which a potential which changes between a first potential and a second potential is applied. ### Claim 2 (depends on 1) The liquid crystal display device according to claim 1, wherein the transistor includes an oxide semiconductor film. ### Claim 3 (depends on 2) The liquid crystal display device according to claim 2, wherein the oxide semiconductor film comprises indium, gallium, and zinc. ### Claim 4 (depends on 1) The liquid crystal display device according to claim 1, wherein, as the potential, a potential with triangle waveform is applied to the wiring. ### Claim 5 (depends on 1) The liquid crystal display device according to claim 1, wherein the first signal and the second signal are configured to be used for one of frame inversion driving, source line inversion driving, gate line inversion driving, or dot inversion driving. ### Claim 6 (depends on 1) The liquid crystal display device according to claim 1, wherein the potential changes after the first signal is supplied until the second signal is supplied so that a change in a voltage applied to the liquid crystal layer is reduced. ### Claim 7 A liquid crystal display device comprising: a pixel portion including a plurality of pixels each comprising: a transistor; a liquid crystal element including a pixel electrode, a common electrode, and a liquid crystal layer over the pixel electrode and the common electrode, wherein a first signal and a second signal having opposite polarities are alternately supplied to the pixel electrode through the transistor; and a first capacitor including a first electrode and a second electrode; and a circuit applying a potential to the second electrode, the potential configured to change between a first potential and a second potential after the first signal is supplied until the second signal is supplied, wherein the pixel electrode and the common electrode partly overlap with each other with an insulating film interposed therebetween, and wherein the first electrode is electrically connected to the pixel electrode. ### Claim 8 (depends on 7) The liquid crystal display device according to claim 7, wherein the transistor includes an oxide semiconductor film. ### Claim 9 (depends on 8) The liquid crystal display device according to claim 8, wherein the oxide semiconductor film comprises indium, gallium, and zinc. ### Claim 10 (depends on 7) The liquid crystal display device according to claim 7, wherein, as the potential, a potential with triangle waveform is applied to the second electrode. ### Claim 11 (depends on 7) The liquid crystal display device according to claim 7, wherein the first signal and the second signal are configured to be used for one of frame inversion driving, source line inversion driving, gate line inversion driving, or dot inversion driving. ### Claim 12 (depends on 7) The liquid crystal display device according to claim 7, wherein the circuit comprises: a first switch; a second switch; a first resistor; a second resistor: a second capacitor; an amplifier, and an inverter, wherein the first switch is configured to be controlled by a signal supplied to a terminal, wherein the terminal is electrically connected to an input terminal of the inverter, wherein the second switch is configured to be controlled by a signal at an output terminal of the inverter, wherein one of terminals of the first switch is electrically connected to one of terminals of the first resistor, wherein one of terminals of the second switch is electrically connected to one of terminals of the second resistor, wherein the other of the terminals of the first resistor, the other of the terminals of the second resistor, one electrode of the second capacitor, and a non-inverting input terminal of the amplifier is electrically connected to one another, and wherein an inverting input terminal of the amplifier, an output terminal of the amplifier, and an output terminal of the circuit is electrically connected to one another. ### Claim 13 A liquid crystal display device comprising: a first insulating film over a first conductive film and a second conductive film; a semiconductor film over the first insulating film, the semiconductor film overlapping with the first conductive film; a third conductive film and a fourth conductive film electrically connected to the semiconductor film, the fourth conductive film overlapping with the second conductive film; a second insulating film over the semiconductor film, the third conductive film, and the fourth conductive film, the second insulating film having an opening; a fifth conductive film over the second insulating film; a third insulating film over the fifth conductive film; a sixth conductive film over the third insulating film, the sixth conductive film overlapping with the fifth conductive film and electrically connected to the fourth conductive film through the opening; a first alignment film over the sixth conductive film and the third insulating film; a liquid crystal layer over the first alignment film; and a second alignment film over the liquid crystal layer, wherein a first signal and a second signal having opposite polarities are alternately supplied to the third conductive film, and wherein a potential configured to change between a first potential and a second potential is applied to the second conductive film. ### Claim 14 (depends on 13) The liquid crystal display device according to claim 13, wherein the semiconductor film comprises indium, gallium, and zinc. ### Claim 15 (depends on 13) The liquid crystal display device according to claim 13, wherein, as the potential, a potential with triangle waveform is applied to the second conductive film. ### Claim 16 (depends on 13) The liquid crystal display device according to claim 13, wherein the first signal and the second signal are configured to be used for one of frame inversion driving, source line inversion driving, gate line inversion driving, or dot inversion driving. ### Claim 17 (depends on 13) The liquid crystal display device according to claim 13, wherein the third insulating film is in contact with the fourth conductive film. ### Claim 18 (depends on 13) The liquid crystal display device according to claim 13, further comprising: a transistor; and a seventh conductive film over the second insulating film, the seventh conductive film overlapping with the transistor. ### Claim 19 (depends on 13) The liquid crystal display device according to claim 13, wherein the first insulating film is in contact with the third insulating film. ### Claim 20 (depends on 19) The liquid crystal display device according to claim 19, wherein the first insulating film and the third insulating film overlap with a sealant.