# US 10,871,841 B2 · Semiconductor display device and driving method the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,871,841 B2 - Document ID: US10871841B2 - Status: Granted - Kind: B2 - Application number: 16/021,137 - Filed: 2018-06-28 - Published: 2018-10-25 - Granted: 2020-12-22 - Earliest claimed: 2010-04-28 - Assignees: Semiconductor Energy Laboratory Co., Ltd. - Applicants: Semiconductor Energy Laboratory Co., Ltd. - Inventors: Shunpei Yamazaki; Jun Koyama - Web page: https://patentgrep.com/patent/US10871841B2 ## CPC - G06F 3/0412: {Digitisers structurally integrated in a display} - G02F 1/13338: {Input devices, e.g. touch panels} - G06F 1/3265: {Power saving in display device} - G06F 3/044: by capacitive means - G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes} - G06F 3/045: using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact - G09G 3/3648: {using an active matrix (G09G3/367 - G09G3/3696 take precedence)} - G09G 3/3677: {suitable for active matrices only} - G09G 3/3688: {suitable for active matrices only} - G09G 2300/0426: Layout of electrodes and connections - G09G 2310/0286: Details of a shift registers arranged for use in a driving circuit - G09G 2310/08: Details of timing specific for flat panels, other than clock recovery - G09G 2330/021: Power management, e.g. power saving - G09G 2360/14: Detecting light within display terminals, e.g. using a single or a plurality of photosensors - Y02D 10/00: Energy efficient computing, e.g. low power processors, power management or thermal management - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - 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) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract It is an object to provide a semiconductor display device having a touch panel, which can reduce power consumption. The semiconductor display device includes a panel which is provided with a pixel portion and a driver circuit which controls an input of the image signal to the pixel portion, and a touch panel provided in a position overlapping with the panel in the pixel portion. The pixel portion includes a display element configured to perform display in accordance with voltage of the image signal to be input, and a transistor configured to control retention of the voltage. The transistor includes an oxide semiconductor in a channel formation region. The driving frequency of the driver circuit, that is, the number of writing operations of the image signal for a certain period is changed in accordance with an operation signal from a touch panel. ## Claims ### Claim 1 A display device comprising: a pixel portion comprising a pixel; a driver circuit configured to drive the pixel portion; and a touch panel overlapping with the pixel portion, wherein an image signal is written to the pixel in a first period, wherein supply of a power supply potential and a driving signal to the driver circuit is stopped in a second period, and wherein the second period is terminated by an operation signal supplied from the touch panel. ### Claim 2 (depends on 1) The display device according to claim 1, wherein a driving frequency of the driver circuit is changed in accordance with the operation signal supplied from the touch panel. ### Claim 3 (depends on 1) The display device according to claim 1, wherein a length of displaying a still image in the pixel portion is changed in accordance with the operation signal supplied from the touch panel. ### Claim 4 (depends on 1) The display device according to claim 1, wherein a driving frequency of the driver circuit when a still image is displayed in the pixel portion is lower than the driving frequency of the driver circuit when a moving image is displayed in the pixel portion. ### Claim 5 (depends on 1) The display device according to claim 1, wherein the touch panel uses any one of a resistive system, a touch panel capacitance system, an ultrasonic system, an optics system, and an electromagnetic induction system. ### Claim 6 (depends on 1) The display device according to claim 1, wherein the touch panel comprises a plurality of first electrodes and a plurality of second electrodes. ### Claim 7 A display device comprising: a pixel portion comprising a pixel; a driver circuit configured to drive the pixel portion; and a touch panel overlapping with the pixel portion, wherein an image signal is written to the pixel in a first period, wherein supply of a power supply potential and a driving signal to the driver circuit is stopped in a second period, wherein the second period is terminated by an operation signal supplied from the touch panel, and wherein the pixel comprises a transistor comprising an oxide semiconductor. ### Claim 8 (depends on 7) The display device according to claim 7, wherein a driving frequency of the driver circuit is changed in accordance with the operation signal supplied from the touch panel. ### Claim 9 (depends on 7) The display device according to claim 7, wherein a length of displaying a still image in the pixel portion is changed in accordance with the operation signal supplied from the touch panel. ### Claim 10 (depends on 7) The display device according to claim 7, wherein a driving frequency of the driver circuit when a still image is displayed in the pixel portion is lower than the driving frequency of the driver circuit when a moving image is displayed in the pixel portion. ### Claim 11 (depends on 7) The display device according to claim 7, wherein the touch panel uses any one of a resistive system, a touch panel capacitance system, an ultrasonic system, an optics system, and an electromagnetic induction system. ### Claim 12 (depends on 7) The display device according to claim 7, wherein the touch panel comprises a plurality of first electrodes and a plurality of second electrodes. ### Claim 13 (depends on 7) The display device according to claim 7, wherein an off-state current density of the transistor is less than or equal to 100 zA/μm. ### Claim 14 (depends on 1) The display device according to claim 1, wherein the driving signal comprises a start signal and a clock signal. ### Claim 15 (depends on 1) The display device according to claim 1, wherein, in the second period, a still image is displayed in the pixel portion. ### Claim 16 (depends on 7) The display device according to claim 7, wherein the driving signal comprises a start signal and a clock signal. ### Claim 17 (depends on 7) The display device according to claim 7, wherein, in the second period, a still image is displayed in the pixel portion. ### Claim 18 A display device comprising: a pixel portion comprising a pixel; a driver circuit configured to drive the pixel portion; and a touch panel overlapping with the pixel portion, wherein an image signal is written to the pixel in a first period, wherein supply of a power supply potential and a driving signal to the driver circuit is stopped in a second period, wherein the second period is terminated by an operation signal supplied from the touch panel, wherein the pixel comprises a transistor, the transistor comprising: a gate electrode; a gate insulating film over the gate electrode; an oxide semiconductor film over the gate insulating film; a source electrode over the oxide semiconductor film; a drain electrode over the oxide semiconductor film; a silicon oxide film over the oxide semiconductor film, the source electrode, and the drain electrode; and a silicon nitride film over the silicon oxide film, wherein the transistor comprises a channel formation region in the oxide semiconductor film, and wherein the oxide semiconductor film comprises indium, gallium, and zinc. ### Claim 19 (depends on 18) The display device according to claim 18, wherein a driving frequency of the driver circuit is changed in accordance with the operation signal supplied from the touch panel. ### Claim 20 (depends on 18) The display device according to claim 18, wherein a length of displaying a still image in the pixel portion is changed in accordance with the operation signal supplied from the touch panel. ### Claim 21 (depends on 18) The display device according to claim 18, wherein a driving frequency of the driver circuit when a still image is displayed in the pixel portion is lower than the driving frequency of the driver circuit when a moving image is displayed in the pixel portion. ### Claim 22 (depends on 18) The display device according to claim 18, wherein the driving signal comprises a start signal and a clock signal. ### Claim 23 (depends on 18) The display device according to claim 18, wherein, in the second period, a still image is displayed in the pixel portion.