Display device and operating method thereof

• US 10,678,375 B2
• Filed: 10/17/2017
• Issued: 06/09/2020
• Est. Priority Date: 10/21/2016
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Takahashi, Kei, Yamazaki, Shunpei
• Primary Examiner(s): Eurice, Michael J
• Application Number:
  US15/786,100
• Publication Number:
  US 20180113564A1
• Time in Patent Office: 966 Days
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133553 Reflecting elements associated to illuminating devices G02F1/133605
• CPC Class Codes: G02F 1/133565 inside the LC elements, i.e. between the cell substrates
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G02F 2201/44 Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers
• 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 3/0443 using a single layer of sensing electrodes
• 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
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/046 with an emissive area and a light-modulating area combined in one pixel
• CPC Class Codes: G09G 2310/0286 Details of a shift registers arranged for use in a driving circuit
• CPC Class Codes: G09G 2310/04 Partial updating of the display screen
• CPC Class Codes: G09G 2330/023 using energy recovery or conservation
• CPC Class Codes: G09G 2330/12 Test circuits or failure detection circuits included in a display system, as permanent part thereof
• CPC Class Codes: G09G 2360/18 Use of a frame buffer in a display terminal, inclusive of the display panel
• CPC Class Codes: G09G 2380/14 Electronic books and readers
• CPC Class Codes: G09G 3/2029 : the sub-frames having non-binary weights
• CPC Class Codes: G09G 3/2033 : with splitting one or more sub-frames corresponding to the most significant bits into two or more sub-frames
• CPC Class Codes: G09G 3/2037 : with specific control of sub-frames corresponding to the least significant bits
• CPC Class Codes: G09G 3/204 : the sub-frames being organized in consecutive sub-frame groups
• CPC Class Codes: G09G 3/3225 : using an active matrix
• CPC Class Codes: G09G 3/3266 : Details of drivers for scan electrodes
• CPC Class Codes: G09G 3/3291 : in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
• CPC Class Codes: G09G 3/3677 : suitable for active matrices only
• CPC Class Codes: G09G 3/3688 : suitable for active matrices only
• CPC Class Codes: H01L 27/1225 : with semiconductor materials not belonging to the group IV of the periodic table, e.g. InGaZnO
• CPC Class Codes: H01L 29/7869 : having a semiconductor body comprising an oxide semiconductor material, e.g. zinc oxide, copper aluminium oxide, cadmium stannate
• CPC Class Codes: H10K 59/1213 : the pixel elements being TFTs
• CPC Class Codes: H10K 59/40 : OLEDs integrated with touch screens
• CPC Class Codes: H10K 59/50 : OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements

Abstract

A display device that achieves both high detection sensitivity of the touch sensor unit and smooth input on the touch sensor unit is provided. A method for driving a display device includes a first period and a second period. The display device includes pixels, a gate driver, and a touch sensor unit. The touch sensor unit detects a touch in the first period and stops detecting a touch in the second period. The gate driver supplies signals to some of the pixels and does not supply signals to the other pixels in the second period.

Claims

1. A method for driving a display device comprising:

the display device comprising pixels, a gate driver, and a touch sensor unit,

the method comprising the steps of;

detecting, by the touch sensor unit, pixels touched by a user, and

supplying, by the gate driver, a signal to a row including the detected pixels during a frame period,

wherein a signal is not supplied to a row not including the detected pixels during the entirety of the frame period, and

wherein the touch sensor unit stops detecting a touch during supplying the signal to the row.

2. The method for driving the display device according to claim 1,

wherein the pixels each comprise a transistor comprising a metal oxide in a channel formation region.

3. A method for driving a display device comprising pixels, a gate driver, and a touch sensor unit,

the method comprising the steps of:

detecting, by the touch sensor unit, pixels touched by a user, and

supplying, by the gate driver, a signal to a row including the detected pixels during a frame period,

wherein a signal is not supplied to a row not including the detected pixels during the entirety of the frame period,

wherein the touch sensor unit stops detecting a touch during supplying the signal to the row, and

wherein the pixel comprises a reflective element and a light-emitting element.

4. The method for driving a display device according to claim 3,

wherein the pixels each comprise a transistor comprising a metal oxide in a channel formation region.