# US 2014/0152630 A1 · Display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0152630 A1 - Document ID: US20140152630A1 - Status: Published application - Kind: A1 - Application number: 14/085,952 - Filed: 2013-11-21 - Published: 2014-06-05 - Earliest claimed: 2012-11-30 - Assignees: Semiconductor Energy Laboratory Co., Ltd. - Applicants: Semiconductor Energy Laboratory Co., Ltd. - Inventors: Jun KOYAMA - Web page: https://patentgrep.com/patent/US20140152630A1 ## CPC - G09G 3/3614: {Control of polarity reversal in general} - G06F 3/0412: {Digitisers structurally integrated in a display} - G06F 3/0443: {using a single layer of sensing electrodes} - G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes} - G09G 3/3648: {using an active matrix (G09G3/367 - G09G3/3696 take precedence)} - H10D 30/6755: {Oxide semiconductors, e.g. zinc oxide, copper aluminium oxide or cadmium stannate} - H10D 30/6757: {characterised by the structure of the channel, e.g. transverse or longitudinal shape or doping profile (TFTs having channel structures for preventing kink or snapback effects H10D30/6708; TFTs having lightly-doped source or drain extensions H10D30/6715)} - G02F 1/13338: {Input devices, e.g. touch panels} - G02F 1/13606: {having means for reducing parasitic capacitance} - G02F 1/1368: in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)} - G06F 2203/04103: Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices - G09G 2320/0219: Reducing feedthrough effects in active matrix panels, i.e. voltage changes on the scan electrode influencing the pixel voltage due to capacitive coupling - G09G 2320/0247: Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes - G09G 2320/103: Detection of image changes, e.g. determination of an index representative of the image change - G09G 2330/021: Power management, e.g. power saving - 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) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES - 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 ## Abstract A novel highly reliable display device is provided. Further, a novel display device capable of displaying images with less flicker is provided. Further, a display device capable of displaying eye-friendly still images is provided. The display device includes a feedthrough correction circuit which corrects a primary image signal. The feedthrough correction circuit corrects the primary image signal to compensate predicted feedthrough. ## Claims ### Claim 1 A display device comprising: a display portion comprising a pixel including a display element and a transistor; and a control portion configured to generate a secondary image signal from a primary image signal and configured to supply the secondary image signal to the display portion, wherein the control portion is configured to correct the primary image signal so that feedthrough caused by a parasitic capacitance of the transistor is compensated, and wherein an amplitude of the secondary image signal corresponds to a difference between a potential of the corrected primary image signal and a reference potential. ### Claim 2 (depends on 1) The display device according to claim 1, wherein the display element is a liquid crystal display element. ### Claim 3 (depends on 1) The display device according to claim 1, wherein the control portion is configured to determine a polarity of the secondary image signal with respect to the reference potential. ### Claim 4 (depends on 1) The display device according to claim 1, wherein the control portion is configured to correct the primary image signal on the basis of an amount of the feedthrough which is estimated by calculation or obtained from empirical data on the basis of a grayscale information included in the primary image signal. ### Claim 5 (depends on 1) The display device according to claim 1, wherein the transistor includes an oxide semiconductor layer. ### Claim 6 (depends on 1) An information processing device comprising an arithmetic device, an input unit and the display device according to claim 1. ### Claim 7 A display device comprising: a display portion comprising a first driver circuit, a first signal line, a second driver circuit, a second signal line and a pixel including a display element and a transistor; and a control portion comprising a feedthrough correction circuit and a polarity determination circuit, wherein the display element includes a first electrode and a second electrode, wherein one of a source and a drain of the transistor is electrically connected to the first electrode, wherein the first signal line is electrically connected to the first driver circuit and the other of the source and the drain of the transistor, wherein the second signal line is electrically connected to the second driver circuit and a gate of the transistor, wherein the feedthrough correction circuit is configured to correct a primary image signal so that feedthrough caused by a parasitic capacitance of the transistor is compensated and supply a secondary image signal to the first driver circuit, wherein an amplitude of the secondary image signal corresponds to a difference between a potential of the corrected primary image signal and a reference potential, and wherein the polarity determination circuit is configured to determine a polarity of the secondary image signal with respect to the reference potential. ### Claim 8 (depends on 7) The display device according to claim 7, wherein the display element is a liquid crystal display element. ### Claim 9 (depends on 7) The display device according to claim 7, wherein the control portion is configured to supply a control signal to the second driver circuit, wherein the control signal includes a mode switching signal for switching the display device between a first mode and a second mode, wherein the second driver circuit is configured to output a signal for selecting the pixel at a rate of more than or equal to 60 Hz and less than 960 Hz in the first mode, and wherein the second driver circuit is configured to output the signal for selecting the pixel at a rate of more than or equal to 0.28 mHz and less than 1 Hz in the second mode. ### Claim 10 (depends on 7) The display device according to claim 7, wherein the second driver circuit is configured to output a driving signal to the second signal line, and wherein the feedthrough correction circuit is configured to generate the secondary image signal by adding feedthrough ΔV1 calculated from a formula (1) to a potential of the primary image signal when the polarity of the secondary image signal determined by the polarity determination circuit is positive and by adding feedthrough ΔV2 calculated from a formula (2) to the potential of the primary image signal when the polarity of the secondary image signal determined by the polarity determination circuit is negative, ΔV1=f(VgH−Vsc−VS1−Vth) (1) ΔV2=f(VgH−Vsc+VS2−Vth) (2) where VgH represents a high potential of the driving signal, Vsc represents the reference potential, and Vth represents a threshold voltage of the transistor. ### Claim 11 (depends on 7) The display device according to claim 7, wherein the transistor includes an oxide semiconductor layer. ### Claim 12 (depends on 7) An information processing device comprising an arithmetic device, an input unit and the display device according to claim 7. ### Claim 13 A method for driving a display device comprising a control portion and a display portion comprising a first driver circuit, a first signal line, a second driver circuit, a second signal line and a pixel including a display element and a transistor, the method comprising the steps of: inputting a primary image signal to the control portion; generating a secondary image signal from the primary image signal; and supplying the secondary image signal to the first driver circuit, wherein a first electrode of the display element is electrically connected to the first driver circuit through the transistor and the first signal line, wherein a second electrode of the display element is supplied with a reference potential, wherein the control portion corrects the primary image signal so that feedthrough caused by a parasitic capacitance of the transistor is compensated, wherein an amplitude of the secondary image signal corresponds to a difference between a potential of the corrected primary image signal and the reference potential, and wherein a polarity of the secondary image signal with respect to the reference potential is inverted every frame. ### Claim 14 (depends on 13) The method for driving a display device according to claim 13, further comprising the step of supplying a control signal to the second driver circuit by the control portion, wherein the control signal includes a mode switching signal switching the display device between a first mode and a second mode, wherein the second driver circuit outputs a signal for selecting the pixel at a rate of more than or equal to 60 Hz and less than 960 Hz in the first mode, and wherein the second driver circuit outputs the signal for selecting the pixel at a rate of more than or equal to 0.28 mHz and less than 1 Hz in the second mode. ### Claim 15 (depends on 13) The method for driving a display device according to claim 13, wherein the control portion is configured to generate the secondary image signal by adding feedthrough ΔV1 calculated from a formula (1) to the potential of the primary image signal when the polarity of the secondary image signal with respect to the reference potential is positive and by adding feedthrough ΔV2 calculated from a formula (2) to the potential of the primary image signal when the polarity of the secondary image signal with respect to the reference potential is negative, ΔV1=f(VgH−Vsc−VS1−Vth) (1) ΔV2=f(VgH−Vsc+VS2−Vth) (2) where VgH represents a high potential of a driving signal applied to a gate of the transistor, Vsc represents the reference potential, and Vth represents a threshold voltage of the transistor. ### Claim 16 (depends on 13) The method for driving a display device according to claim 13, wherein in a period during which a still image is displayed in the display portion, the control portion corrects the primary image signal so that the amplitude of the secondary image signal becomes smaller when the polarity is negative than when the polarity is positive. ### Claim 17 (depends on 13) The method for driving a display device according to claim 13, wherein the transistor includes an oxide semiconductor layer.