USOO7868880B2
`
`(12) United States Patent
`Ozaki et al.
`
`(10) Patent No.:
`(45) Date of Patent:
`
`US 7,868,880 B2
`Jan. 11, 2011
`
`(54)
`
`(75)
`
`(73)
`(*)
`
`(21)
`(22)
`(65)
`
`DISPLAY APPARATUS AND DRIVE
`CONTROL METHOD THEREOF
`
`Inventors: Tsuyoshi Ozaki, Fuchu (JP); Jun
`Ogura, Fussa (JP)
`Assignee: Casio Computer Co., Ltd., Tokyo (JP)
`
`Notice:
`
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 1056 days.
`Appl. No.: 11/438,967
`Filed:
`May 23, 2006
`
`Prior Publication Data
`US 2006/0267886A1
`Nov.30, 2006
`
`Foreign Application Priority Data
`(30)
`May 24, 2005
`(JP)
`............................. 2005-150566
`May 26, 2005
`(JP)
`............................. 2005-153382
`
`(51)
`
`(52)
`
`(58)
`
`(56)
`
`Int. C.
`(2006.01)
`G09G 5/00
`U.S. Cl. ....................... 345/204; 34.5/100; 34.5/207;
`34.5/210; 34.5/211; 345/690
`Field of Classification Search ............. 345/76-84,
`345/87-104, 204-215,690-699; 315/169.1-169.4
`See application file for complete search history.
`References Cited
`
`U.S. PATENT DOCUMENTS
`7,071,932 B2 * 7/2006 Libsch et al. ............... 345,211
`7,248,237 B2 * 7/2007 Yamada et al. ................ 47
`7,345,685 B2 * 3/2008 Miyazawa .................. 345/2O7
`7,348,942 B2
`3, 2008 Jo
`
`7,362.288 B2
`2003/OO95087 A1
`
`4/2008 Jang
`5/2003 Libsch et al.
`(Continued)
`FOREIGN PATENT DOCUMENTS
`
`JP
`
`9, 2004
`2004-25.2104 A
`(Continued)
`OTHER PUBLICATIONS
`Notification Concerning Transmittal of International Search Report
`and Written Opinion of the International Searching Authority for
`PCT/JP2006/310616, dated Mar. 15, 2007, 23 sheets.
`(Continued)
`Primary Examiner Vijay Shankar
`(74) Attorney, Agent, or Firm Holtz, Holtz, Goodman &
`Chick, PC
`
`ABSTRACT
`(57)
`A display apparatus is disclosed. A display panel includes a
`plurality of display pixels arranged at intersections of a plu
`rality of scanning lines and a plurality of data lines. A scan
`ning drive unit sequentially applies a scanning signal to each
`of the scanning lines and sets the corresponding display pixels
`to a selection state. A data drive unit generates a gradation
`signal corresponding to the display data and Supplies the
`gradation signal to the display pixels. A power source drive
`unit Supplies to the display pixels a drive Voltage for control
`ling a drive state of each of the display pixels. A drive control
`unit controls the power source drive unit to operate to set the
`display pixels to a non-display operation state during a non
`display period, and controls the scanning drive unit to operate
`to set the display pixels to the selection state during the
`displ
`iod
`non-display period.
`
`40 Claims, 27 Drawing Sheets
`
`TIMING SIGNA
`
`SIGNAL
`
`DISPLAY
`S.
`GENERATION
`CIRCUIT
`
`
`
`
`
`
`
`DISPLAY
`DATA
`
`SYSTEMCONTROLLER
`
`
`
`150
`
`SCANNING
`CONTROL
`SGNAL
`
`140
`
`DATA CONTROL
`SIGNAL
`
`POWER SOURCE
`CONTROL SIGNAL
`
`DATA RIVER
`
`
`
`
`
`
`
`DISPLAYPANEL
`
`100A
`
`120
`
`110
`
`130
`
`Petitioner Samsung Ex. 1001 - Page 1 of 51
`
`

`

`US 7,868,880 B2
`Page 2
`
`U.S. PATENT DOCUMENTS
`
`5/2004 Miyazawa
`2004/0090434 A1
`2004/02566.17 A1 12/2004 Yamada et al.
`2005/0057454 A1
`3/2005 Jang
`2006, OO17668 A1
`1/2006 Shirasaki et al.
`
`JP
`JP
`JP
`JP
`JP
`KR
`
`FOREIGN PATENT DOCUMENTS
`2004-287.349 A 10, 2004
`2004-341267 A 12, 2004
`2005-006250 A
`1, 2005
`2005-099773. A
`4/2005
`2005-107233 A
`4/2005
`2003-0032530 A
`4/2003
`
`3, 2004
`WO WO 2004/019314 A1
`WO WO 2004/086347 A2 10, 2004
`
`OTHER PUBLICATIONS
`
`Korean Office Action (and English translation thereof) dated Sep. 30.
`2008, issued in a counterpart Korean Application.
`Japanese Office Action dated May 13, 2010 and English translation
`thereof in counterpart Japanese Application No. 2005-150566.
`Japanese Office Action dated May 25, 2010 and English translation
`thereof in counterpart Japanese Application No. 2005-153382.
`Japanese Office Action dated Jul. 30, 2010 and English translation
`thereof, issued i
`terpart J
`Application No. 2005
`T. Issued in counterp
`apanese Application No.
`
`* cited by examiner
`
`Petitioner Samsung Ex. 1001 - Page 2 of 51
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`

`

`U.S. Patent
`
`Jan. 11, 2011
`
`Sheet 1 of 27
`
`US 7,868,880 B2
`
`
`
`
`
`POWER SOURCE DRIVER
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`
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`SCANNING DRIVER
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`HETTOELNOO INELLSÅS
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`017||TV/NS)IS
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`LITIKOHIO
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`Petitioner Samsung Ex. 1001 - Page 3 of 51
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`

`

`U.S. Patent
`U.S. Patent
`
`11021,1
`
`US 7,868,880 B2
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`Petitioner Samsung Ex. 1001 - Page 4 of 51
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`Petitioner Samsung Ex. 1001 - Page 4 of 51
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`

`

`U.S. Patent
`
`Jan. 11, 2011
`
`Sheet 3 of 27
`
`US 7,868,880 B2
`
`FIG.3
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`data
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`
`Petitioner Samsung Ex. 1001 - Page 5 of 51
`
`

`

`U.S. Patent
`
`Jan. 11, 2011
`
`Sheet 4 of 27
`
`US 7,868,880 B2
`
`
`
`CLK
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`DATA
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`GRADATION V0
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`
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`TO DISPLAY PANEL
`(EACH DATA LINE)
`
`Petitioner Samsung Ex. 1001 - Page 6 of 51
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`

`

`U.S. Patent
`
`Jan. 11, 2011
`
`Sheet 5 Of 27
`
`US 7,868,880 B2
`
`FIG.5
`
`ONE PROCESS CYCLE PERIODTcyc
`NONLIGHTEMTNG LIGHTEMTING
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`Tnem
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`POTENTIAL Vc
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`ENDS OF
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`LIGHT EMITTING
`DRIVE CURRENT Ib
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`(a)
`
`Petitioner Samsung Ex. 1001 - Page 7 of 51
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`

`

`U.S. Patent
`US. Patent
`
`Jan. 11, 2011
`Jan. 11,2011
`
`Sheet 6 of 27
`Sheet 6 of 27
`
`US 7,868,880 B2
`US 7,868,880 B2
`
`FIG.6A
`FIG.6A
`
`
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`Vcom (GND)
`
`
`
`
`FIG.GB
`
`Petitioner Samsung Ex. 1001 - Page 8 of 51
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`Petitioner Samsung Ex. 1001 - Page 8 of 51
`
`

`

`U.S. Patent
`US. Patent
`
`Jan. 11, 2011
`Jan. 11,2011
`
`Sheet 7 Of 27
`Sheet 7 of 27
`
`US 7,868,880 B2
`US 7,868,880 B2
`
`FIG.7
`FIG.7
`
`
`
`
`
`Petitioner Samsung EX. 1001 - Page 9 0f 51
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`Petitioner Samsung Ex. 1001 - Page 9 of 51
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`

`

`U.S. Patent
`
`Jan. 11, 2011
`
`Sheet 8 of 27
`
`US 7,868,880 B2
`
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`Petitioner Samsung Ex. 1001 - Page 10 of 51
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`

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`U.S. Patent
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`Petitioner Samsung Ex. 1001 - Page 11 0f 51
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`Petitioner Samsung Ex. 1001 - Page 11 of 51
`
`
`

`

`U.S. Patent
`
`Jan. 11, 2011
`
`Sheet 10 of 27
`
`US 7,868,880 B2
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`Petitioner Samsung Ex. 1001 - Page 12 of 51
`
`

`

`U.S. Patent
`
`Jan. 11, 2011
`
`Sheet 11 of 27
`
`US 7,868,880 B2
`
`FIG.11
`
`
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`W
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`
`Petitioner Samsung Ex. 1001 - Page 13 of 51
`
`

`

`U.S. Patent
`
`Jan. 11, 2011
`
`Sheet 12 of 27
`
`US 7,868,880 B2
`
`FIG. 12
`
`ONE PROCESS CYCLE PERIODTcyc
`NON-LIGHT EMITTING
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`Petitioner Samsung Ex. 1001 - Page 14 of 51
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`

`

`U.S. Patent
`
`Jan. 11, 2011
`
`Sheet 13 of 27
`
`US 7,868,880 B2
`
`FIG.13A
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`FIG.13B
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`
`Petitioner Samsung Ex. 1001 - Page 15 of 51
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`

`

`U.S. Patent
`
`Jan. 11, 2011
`
`Sheet 14 of 27
`
`US 7,868,880 B2
`
`FIG.14A
`
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`FIG.14B
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`Petitioner Samsung Ex. 1001 - Page 16 of 51
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`

`

`U.S. Patent
`
`Jan. 11, 2011
`
`Sheet 15 Of 27
`
`US 7,868,880 B2
`
`
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`AMOUNT (V)
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`Petitioner Samsung Ex. 1001 - Page 17 of 51
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`

`

`U.S. Patent
`U.S. Patent
`
`Jan. 11, 2011
`
`Sheet 16 of 27
`
`US 7,868,880 B2
`US 7,868,880 B2
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`Petitioner Samsung Ex. 1001 - Page 18 of 51
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`

`U.S. Patent
`
`Jan. 11, 2011
`
`Sheet 17 of 27
`
`US 7,868,880 B2
`
`FIG.17
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`DSRY
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`Petitioner Samsung Ex. 1001 - Page 19 of 51
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`

`

`U.S. Patent
`
`Jan. 11, 2011
`
`Sheet 18 of 27
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`US 7,868,880 B2
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`Petitioner Samsung Ex. 1001 - Page 20 of 51
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`

`

`U.S. Patent
`
`Jan. 11, 2011
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`Sheet 19 of 27
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`US 7,868,880 B2
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`Petitioner Samsung Ex. 1001 - Page 21 of 51
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`

`

`U.S. Patent
`
`Jan. 11, 2011
`
`Sheet 20 of 27
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`US 7,868,880 B2
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`Petitioner Samsung Ex. 1001 - Page 22 of 51
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`Petitioner Samsung Ex. 1001 - Page 23 of 51
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`Petitioner Samsung Ex. 1001 - Page 23 of 51
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`U.S. Patent
`
`Jan. 11, 2011
`
`Sheet 22 of 27
`
`US 7,868,880 B2
`
`FIG
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`Petitioner Samsung Ex. 1001 - Page 24 of 51
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`

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`U.S. Patent
`
`Jan. 11, 2011
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`Sheet 23 of 27
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`US 7,868,880 B2
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`Petitioner Samsung Ex. 1001 - Page 25 of 51
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`Petitioner Samsung Ex. 1001 - Page 25 of 51
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`
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`

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`U.S. Patent
`
`Jan. 11, 2011
`
`Sheet 24 of 27
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`US 7,868,880 B2
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`Petitioner Samsung Ex. 1001 - Page 26 of 51
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`

`

`U.S. Patent
`
`Jan. 11, 2011
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`Sheet 25 of 27
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`US 7,868,880 B2
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`FIG.25
`PRIOR ART
`
`DISPLAY
`DATA
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`DATARNROL
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`14OP
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`SCANNING
`CONTROL
`SIGNAL
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`12OP
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`Petitioner Samsung Ex. 1001 - Page 27 of 51
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`

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`U.S. Patent
`
`Jan. 11, 2011
`
`Sheet 26 of 27
`
`US 7,868,880 B2
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`Petitioner Samsung Ex. 1001 - Page 28 0f 51
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`Petitioner Samsung Ex. 1001 - Page 28 of 51
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`

`U.S. Patent
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`Jan. 11, 2011
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`Sheet 27 of 27
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`US 7,868,880 B2
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`Petitioner Samsung Ex. 1001 - Page 29 of 51
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`

`

`1.
`DISPLAY APPARATUS AND DRIVE
`CONTROL METHOD THEREOF
`
`US 7,868,880 B2
`
`CROSS-REFERENCE TO RELATED
`APPLICATIONS
`
`This application is based upon and claims the benefit of
`priority from prior Japanese Patent Applications No. 2005
`150566, filed May 24, 2005; and No. 2005-153382, filed May
`26, 2005, the entire contents of both of which are incorporated
`herein by reference.
`
`BACKGROUND OF THE INVENTION
`
`1. Field of the Invention
`The present invention relates to a display apparatus and a
`display drive method thereof. In particular, the invention
`relates to a display apparatus and a drive control method
`thereof, the apparatus being provided with a display panel
`having a plurality of current control type optical elements
`arranged thereon to display image information.
`2. Description of the Related Art
`In recent years, light weight and thin type display devices
`which consume a lower amount of electric power are con
`spicuously prevalent as monitors and displays of personal
`computers and video equipment. In particular, liquid crystal
`display (LCD) apparatuses are widely applied as display
`devices for mobile phones, digital cameras, personal data
`assistants (PDAs), and portable devices (mobile handsets)
`Such as electronic dictionaries.
`As a next-generation display device which follows such an
`LCD apparatus, research and development have been briskly
`made toward a full-scale popularization of a self-luminous
`type display device (a self-luminous type display) provided
`with a display panel in which organic electroluminescent
`elements (organic EL elements), inorganic electrolumines
`cent element (inorganic EL elements) or self-luminous type
`optical elements such as light emitting diodes (LED) are
`arranged in a matrix form.
`In particular, a self-luminous type display apparatus to
`which an active matrix drive mode is applied has a higher
`display response speed than that of the above-described liquid
`crystal display. Further, the self-luminous type display appa
`ratus does not have view field angle dependency, and can
`achieve an increase in luminance/contrast and in fineness of a
`display image quality. Furthermore, the self-luminous type
`display apparatus does not require the backlight used in a
`liquid crystal display, and hence the self-luminous type dis
`play has very advantageous characteristics in the application
`to portable devices that a further reduction in a thickness and
`a weight and/or a further decrease in power consumption is
`possible.
`FIG.25 is schematic structural diagram showing a primary
`part of an active matrix type self-luminous type display appa
`ratus in a prior art.
`FIG. 26 is a timing chart showing one example of a display
`drive method of the active matrix type self-luminous type
`display apparatus in the prior art.
`FIG. 27 is a timing chart showing another example of the
`active matrix type self-luminous type display apparatus in the
`prior art.
`Here, in FIGS. 26 and 27, for ease of comparison with
`embodiments which will be described later, there is shown a
`display drive method in the case where the apparatus has a
`configuration in which a display panel has twelve rows (first
`to twelfth rows) of display pixels arranged. In FIGS. 26 and
`27, symbol K denotes a positive integer. Incidentally, hatch
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`ing is provided for clarifying a writing operation and display
`operation of image data in each row, and writing operation
`and display operation of blanking data.
`An active matrix type display apparatus Such as a liquid
`crystal display apparatus and a self-luminous type display
`apparatus generally has, as shown in FIG. 25, a configuration
`comprising: a display panel 110P in which a plurality of
`display pixels EMp are arranged in two dimensions in the
`vicinity of intersections of a plurality of Scanning lines SLp
`and data lines DLp arranged in row and column directions; a
`scanning driver 120P which is connected with the scanning
`lines SLp; and a data driver 140P which is connected with the
`data lines DL.
`For example, as shown in FIG. 26, in a display drive control
`in the display apparatus having Such a configuration, display
`pixels EMp for each row are sequentially set to a selection
`state by sequentially applying a selection level scanning sig
`nal Ssel to the scanning lines SLp in each row from the
`scanning driver 120P in the beginning. Then, in Synchroniza
`tion with the selection timing of each row, a gradation Voltage
`Vpix corresponding to image data (display data) in the row is
`applied to the data line DLp in each column from the data
`driver 140P, whereby a voltage component based on the gra
`dation voltage Vpix is held to each of the display pixels EMp
`(a image data writing period). As a consequence, a gradation
`control corresponding to the above-described Voltage com
`ponent is performed in each display pixel EMp, so that a
`display operation (light emitting operation) corresponding to
`the image data is performed and desired image information is
`displayed on the display panel.
`Subsequently, the display pixels EMp for each row are set
`to a non-selection state by sequentially applying a non-selec
`tion level scanning signal Ssel to the scanning lines SLp from
`the scanning driver 120P However, when the voltage com
`ponent written immediately previously is held in each of the
`display pixels, the display operation corresponding to the
`image data continues (a image display period), and the opera
`tion continues until next image data is written in the display
`pixels EMp in each row. This type of display control method
`is referred to as a hold type.
`In Such a hold type display control method, there is pro
`vided a characteristic Such that flickering is hardly generated
`in the display operation of static images because the display
`operation (the light emitting operation) corresponding to the
`image data continues in almost all the period of one frame
`period. However, on the other hand, in the display of moving
`images, image information displayed in the previous frame
`period can become visually recognized more easily as an
`afterimage, and consequently, blurs and stains of the image
`information occur, which will lead to the deterioration of
`display image quality.
`Then, as a display drive method for improving the display
`image quality by Suppressing blurs and stains in the display
`operation of moving images, there is known a technique for
`performing, in one frame period, an operation (a blanking
`data writing period) of Supplying from a data driver to each
`data line blanking data for performing an operation (a light
`emitting operation) of displaying each display pixel EMp at
`the lowest gradation, or for performing a non-display opera
`tion (a non-light emitting operation) and a black display
`operation (a black display period) based on the blanking data,
`in addition to the above-described image data writing period
`and image display period. As a consequence, a definite length
`of a black display period is inserted into the one frame period
`and a blank display state is set. Accordingly, a display drive
`method (referred to as a “pseudo-impulse type display drive
`method for convenience) in which the image display period
`
`Petitioner Samsung Ex. 1001 - Page 30 of 51
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`3
`is relatively reduced can be realized and a display image
`quality in the display operation of moving images can be
`improved.
`However, in Such a pseudo-impulse type display drive
`method, as shown in FIG. 27, it is required to set, in one frame
`period, the writing period of the blanking data Supplied from
`the data driver and the black display period as well as the
`writing period of the image data Supplied from the data driver
`and the image display period. For this reason, only the writing
`operation of the image data Supplied from the data driver and
`the image display operation are performed in one frame
`period as shown in FIG. 26. As compared with the case in
`which the black display operation is not performed, the time
`which can be allocated to the writing operation of the image
`data is shortened, and as a consequence, it becomes necessary
`to write the image data at a high speed by heightening a drive
`frequency (that is, the drive frequency of the display appara
`tus) associated with the writing operation of the image data.
`In this manner, when the writing period of the image data
`(display data) is shortened so that the writing operation must
`be performed at a high rate, a writing insufficiency occurs
`owing to the insufficiency of the time for writing the image
`data to each display pixel with respect to a signal delay
`generated resulting from a CR time constant produced by a
`resistance component parasitic on signal wirings of a display
`panel and a capacity component, etc. Consequently, grada
`tion display corresponding to the image data may not be
`executed properly.
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`BRIEF SUMMARY OF THE INVENTION
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`30
`
`The present invention has an advantage in that the inven
`tion can provide a display apparatus which comprises an
`active matrix type display panel and displays image informa
`tion corresponding to display data, the apparatus being
`capable of displaying moving images with a favorable display
`quality while being capable of displaying image information
`at an appropriate gradation corresponding to the display data,
`and also can provide a display drive method thereof.
`A display apparatus according to the present invention to
`obtain the above advantage comprises: a display panel includ
`ing a plurality of display pixels arranged thereon in vicinities
`of respective intersections of a plurality of Scanning lines
`arranged in a row direction and a plurality of data lines
`arranged in a column direction; a scanning drive unit which
`sequentially applies a scanning signal to each of said plurality
`of scanning lines and sets the display pixels corresponding to
`each the scanning line to a selection State; a data drive unit
`which generates a gradation signal corresponding to the dis
`play data and Supplies the gradation signal to the display
`pixels set to the selection state; a power source drive unit
`which Supplies to the display pixels a drive Voltage for con
`trolling a drive state of each of the display pixels; and a drive
`control unit which: (i) controls the power source drive unit to
`operate to set the display pixels to a non-display operation
`state during a non-display period in which the display pixels
`do not display the display data, and (ii) controls the scanning
`drive unit to operate to set the display pixels to the selection
`state during the non-display period.
`A drive control method of controlling a display apparatus
`according to the present invention to obtain the above advan
`tage, in which the display apparatus comprises a display panel
`including a plurality of display pixels arranged thereon in
`vicinities of intersections of a plurality of scanning lines
`arranged in a row direction and a plurality of data lines
`arranged in a column direction, the method comprising:
`sequentially setting the display pixels to a selection state, row
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`US 7,868,880 B2
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`4
`by row; sequentially Supplying a gradation signal corre
`sponding to the display data to the display pixels, row by row,
`in each row set to the selection state; setting each of the
`display pixels to a display operation state in a bias State
`corresponding to the gradation signal; and setting the display
`pixels to a non-display operation state in a non-display period
`in which the display pixels do not display the display data;
`wherein the display pixels are set to the selection state while
`set in the non-display operation State.
`
`BRIEF DESCRIPTION OF THE SEVERAL
`VIEWS OF THE DRAWING
`
`FIG. 1 is a schematic block diagram showing a first
`embodiment of a display apparatus according to the present
`invention.
`FIG. 2 is a structural diagram of a primary part, showing
`one example of a display panel applied to the display appa
`ratus according to the first embodiment and a peripheral cir
`cuit thereof.
`FIG. 3 is a circuit structural diagram showing one example
`of a display pixel applied to a display apparatus according to
`the first embodiment.
`FIG. 4 is a schematic block diagram showing one example
`of a data driver which can be applied to the display apparatus
`according to the first embodiment.
`FIG. 5 is a timing chart showing a drive control method in
`the display pixel applied to the display apparatus according to
`the first embodiment.
`FIGS. 6A and 6B are conceptual diagrams each showing a
`non-light emitting operation and a writing operation in the
`display pixel according to the first embodiment.
`FIG. 7 is a conceptual diagram showing a light emitting
`operation in the display pixel according to the first embodi
`ment.
`FIG. 8 is a timing chart showing one example of the display
`drive method of the display apparatus according to the first
`embodiment.
`FIG. 9 is a schematic block diagram showing a second
`embodiment of the display apparatus according to the present
`invention.
`FIG. 10 is a structural diagram of a primary part, showing
`one example of a display panel applied to the display appa
`ratus according to the second embodiment and a peripheral
`circuit thereof.
`FIG. 11 is a circuit structural diagram showing one
`example of a display pixel applied to the display apparatus
`according to the second embodiment.
`FIG. 12 is a timing chart showing a drive control method in
`the display pixel applied to the display apparatus according to
`the second embodiment.
`FIGS. 13A and 13B are conceptual diagrams showing a
`reverse bias setting operation and a non-light emitting opera
`tion in the display pixel according to the second embodiment.
`FIGS. 14A and 14B are conceptual diagrams showing a
`writing operation and a light emitting operation in the display
`pixel according to the second embodiment.
`FIG. 15 is a graph showing an experiment result represen
`tative of a change amount of a threshold Voltage in the case
`where a switching element for display drive is set to a reverse
`bias state in the display pixel according to the second embodi
`ment.
`FIG. 16 is a timing chart showing one example of the
`display drive method of the display apparatus according to the
`second embodiment.
`
`Petitioner Samsung Ex. 1001 - Page 31 of 51
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`

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`5
`FIG. 17 is a structural diagram of a primary part, showing
`one example of a display panel applied to a display apparatus
`according to a third embodiment.
`FIG. 18 is a structural diagram of a primary part, showing
`one example of a peripheral circuit of the display panel
`applied to the display apparatus according to the third
`embodiment.
`FIG. 19 is a structural diagram of a primary part, showing
`another example of the display panel applied to the display
`apparatus according to the third embodiment and the periph
`eral circuit thereof.
`FIG. 20 is a timing chart showing a first example of the
`display drive method of the display apparatus according to the
`third embodiment.
`FIG. 21 is a timing chart showing a second example of the
`display drive method of the display apparatus according to the
`third embodiment.
`FIG. 22 is a structural diagram of a primary part, showing
`one example of a display panel applied to a display apparatus
`according to a fourth embodiment and a peripheral circuit
`thereof.
`FIG. 23 is a timing chart showing a first example of a
`display drive method of the display apparatus according to the
`fourth embodiment.
`FIG. 24 is a timing chart showing a second example of the
`display drive method of the display apparatus according to the
`fourth embodiment.
`FIG. 25 is a conceptual structural diagram showing a pri
`mary part of a Voltage control active matrix self-luminous
`type display in the prior art.
`FIG. 26 is an equivalent circuit diagram showing a struc
`tural example of a display pixel applicable to the self-lumi
`nous type display in the prior art.
`FIG.27 is a timing chart showing one example of a display
`drive method of a display panel in the prior art.
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`DETAILED DESCRIPTION OF THE INVENTION
`
`Hereinafter, a display apparatus according to the present
`invention and a drive control method thereof will be
`explained in detail on the basis of embodiments shown in the
`figure.
`
`40
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`First Embodiment
`
`First, a schematic configuration of a display apparatus
`according to a first embodiment will be explained with refer
`ence to the drawings. FIG. 1 is a schematic block diagram
`showing the first embodiment of the display apparatus
`according to the invention.
`FIG. 2 is a structural diagram of a primary part, showing
`one example of a display panel applied to the display appa
`ratus according to the first embodiment and a peripheral cir
`cuit thereof.
`Incidentally, in the embodiment shown hereinbelow, there
`will be explained a self-luminous type display apparatus
`wherein a display panel has a configuration in which a plu
`rality of display pixels provided with self-luminous type light
`emitting elements are arranged in two dimensions as optical
`elements, the display apparatus displaying image information
`by allowing the optical elements of each of the display pixels
`to perform a light emitting operation with a luminance gra
`dation corresponding to display data (image data). However,
`the present invention is not limited thereto. Like a liquid
`crystal display apparatus, a display apparatus may be permis
`sible which provides a gradation display (display operation)
`of desired image information by means of transmitting light
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`US 7,868,880 B2
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`6
`or reflecting light in Such a manner that each display pixel is
`gradation-controlled in accordance with display data (set to a
`bias state in accordance to the display data).
`As shown in FIGS. 1 and 2, a display apparatus 100A
`according to the present embodiment comprises a display
`panel 110, a scanning driver (a scanning drive unit) 120, a
`power source driver (a power source drive unit) 130, a data
`driver (a data drive unit) 140, a system controller (a drive
`control unit) 150, and a display signal generation circuit 160.
`The display panel 110 has a plurality of display pixels EM
`arranged thereon in the vicinity of intersections of a plurality
`of scanning lines SL and a plurality of data lines DL arranged
`So as to generally extend at right angles to each other in row
`and column directions, the pixels being provided with a dis
`play drive circuit described later and a light emitting element.
`The scanning driver 120 is connected with the Scanning lines
`SL of the display panel 110, and sequentially applies a selec
`tion level (high level) scanning signal Vsel at a predetermined
`timing for the scanning lines SL, thereby setting display
`pixels EM for each row to a selection state.