W0 2004"]19314
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`PCTIJPZOO31010644 _
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`Sl
`
`light-emitting elements Eivi to Ei,n of the ith row.
`
`Hence,
`
`in all the pixel circuits Di,l to Di,n of the
`
`ith row,
`
`a driving current equal to the gray level
`
`designation current IDATA flows from the common signal
`
`5
`
`supply line 21 to the light—emitting elements Ei,1
`
`to Ei,n of the ith row through the drains 233 and
`
`sources 235 of the third transistors 23. Hence,
`
`the
`
`light-emitting elements Ei,1 to Ei,n emit light.
`
`More specifically,
`
`in each of the pixel circuits
`
`10
`
`Di,l to Di,n during the non—selection period TNSE'
`
`the first transistor 21 functions to electrically
`
`disconnect the corresponding signal line Yj
`
`from
`
`the third transistor 23 such that the gray level
`
`designation current IDAIA flowing to the signal line Yj
`
`15
`
`does not flow to the third transistor 23.
`
`The second
`
`transistor 22 functions to hold the voltage between the
`
`gate 23g and the source 235 of the third transistor 23,
`
`which is converted during the selection period TSE: by
`
`confining the charges in the capacitor 24.
`
`In all the
`
`20
`
`pixel circuits Di,l to Di,n of the ith row, when the
`
`common signal is set to the voltage VHIGH during the
`
`non—selection period TNSEr
`
`the third transistor 23
`
`functions to supply a driving current of a level
`
`corresponding to'the held gate—source voltage level to
`
`25
`
`the light-emitting element Ei,j'
`
`Hence,
`
`the light—emitting elements E111 to Ei,n of
`
`the ith row do not emit light during each of the
`
`MEDmlchwohzm1m1u1_|_,
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`SAMSUNG EX. 1002 - 707/899
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`"
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`PCTIJPZOO31010644 _
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`Sl
`
`light-emitting elements Eivi to Ei,n of the ith row.
`
`Hence,
`
`in all the pixel circuits Di,l to Di,n of the
`
`ith row,
`
`a driving current equal to the gray level
`
`designation current IDATA flows from the common signal
`
`5
`
`supply line 21 to the light—emitting elements Ei,1
`
`to Ei,n of the ith row through the drains 233 and
`
`sources 235 of the third transistors 23. Hence,
`
`the
`
`light-emitting elements Ei,1 to Ei,n emit light.
`
`More specifically,
`
`in each of the pixel circuits
`
`10
`
`Di,l to Di,n during the non—selection period TNSE'
`
`the first transistor 21 functions to electrically
`
`disconnect the corresponding signal line Yj
`
`from
`
`the third transistor 23 such that the gray level
`
`designation current IDAIA flowing to the signal line Yj
`
`15
`
`does not flow to the third transistor 23.
`
`The second
`
`transistor 22 functions to hold the voltage between the
`
`gate 23g and the source 235 of the third transistor 23,
`
`which is converted during the selection period TSE: by
`
`confining the charges in the capacitor 24.
`
`In all the
`
`20
`
`pixel circuits Di,l to Di,n of the ith row, when the
`
`common signal is set to the voltage VHIGH during the
`
`non—selection period TNSEr
`
`the third transistor 23
`
`functions to supply a driving current of a level
`
`corresponding to'the held gate—source voltage level to
`
`25
`
`the light-emitting element Ei,j'
`
`Hence,
`
`the light—emitting elements E111 to Ei,n of
`
`the ith row do not emit light during each of the
`
`MEDmlchwohzm1m1u1_|_,
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`52
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`selection periods TSE of the first to mth rows.
`
`The _
`
`light—emitting elements Ei,l to Ei,n emit light during
`
`each of the m non—selection periods TNSE in one
`
`scanning period Tsc.
`
`The current value of the driving
`
`5
`
`current that flows to the light—emitting elements Ei,l
`
`to Ei,n when the common signal is at VHIGH is the same
`
`as that of the current flowing to the third transistor
`
`23 of each of the pixel circuits Di,1 to Di,n-
`
`lhat
`
`is,
`
`the current value is equal to that of the gray
`
`10
`
`level designation current IDATA that flows to the third
`
`transistor 23 of each of the pixel circuits Di,l to
`
`Di,n during the selection period TSE of the ith row.
`
`During the selection period TSE of the ith row, when
`
`the current value that flows to the third transistor 23
`
`15
`
`of each of the pixel circuits Di,l to Di,n of the ith
`
`row is set,
`
`the driving current of each of the
`
`light—emitting elements Ei,l to Ei,n has a desired
`
`current value. Hence,
`
`the light-emitting elements Ei,1
`
`to Ei,n emit light at a desired gray level luminance.
`
`20
`
`As described above,
`
`in this embodiment, even when
`
`the current vs. voltage characteristic of the third
`
`transistor 23 changes between the pixel circuits Dl,1
`
`to Dm,nr
`
`the gray level designation current IDATA
`
`having a predetermined current value is forcibly
`
`25
`
`supplied between the source 235 and the drain 23d of
`
`the third transistor 23 during the selection period
`
`TSE-
`
`In addition, when the voltage between the source
`
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`53
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`235 and the drain.23d of the third transistor 23 is
`
`always saturated, as shown in FIG. 7,
`
`the common signal-
`
`of the voltage VHIGH is output to the common signal
`
`supply lines 21 to Zm during the nOn-selection period
`
`5
`
`TNSE- Accordingly, a driving current having a current
`
`value equal to the gray level designation current
`
`IDAIA
`
`is supplied between the source 235 and the drain 23d
`
`of the third transistor 23.
`
`For this reason,
`
`the
`
`luminance does not vary between the light—emitting
`
`10
`
`elements El,l to Em,n of the pixels._ That is,
`
`in this
`
`embodiment, even when a luminance gray level signal
`
`having the same voltage level is output to pixels, any
`
`in—plane variation in luminance between the pixels can
`
`be suppressed. Hence,
`
`the organic EL display 1 of this
`
`15
`
`embodiment can display a high—quality image.
`
`During the non—selection period TNSEr
`
`the common
`
`signal changes to VHIGH m times.
`
`The light emission
`
`duty of the light—emitting element Ei,j is about 50%.
`
`To the contrary,
`
`in a simple matrix driving display
`
`20
`
`having m light—emitting elements arrayed in the
`
`vertical direction and n light—emitting elements
`
`arrayed in the horizontal direction,
`
`the light emission
`
`duty is l/m.
`
`In the simple matrix driving display, as
`
`the resolution becomes high,
`
`the light emission duty of
`
`25
`
`the lighteemitting element decreases.
`
`In the organic
`
`EL display 1 of this embodiment, however, even when the
`
`resolution becomes high,
`
`the light emission duty of the
`
`HHSDDCID: «:wo__200a01931u1__|_;
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`light—emitting element Ei,j does not decrease.
`
`The
`
`organic EL display 1 can display an image at a high
`
`luminance, high contrast, and high resolution.
`
`One selection scanning line Xi and one common
`
`5
`
`signal supply line Zi are arranged in each row. Not a
`
`signal for scanning but a common signal is simply
`
`output from the common signal power supply 6 to the
`
`common signal supply line Zi.
`
`The only shift register
`
`for scanning, which is arranged in the organic EL
`
`10
`
`display 1,
`
`is the selection scanning driver 5. A.shift
`
`register is generally formed from m flip—flop circuits.
`
`The common signal power supply 6-only needs to output
`
`signals having the same waveform to all the common
`
`signal supply lines 21 to Zm and therefore can have a
`
`15
`
`simplified circuit structure.
`
`For this reason,
`
`in the
`
`common signal power supply 6,
`
`the mounting area is
`
`smaller,
`
`the structure is simpler, and the number of
`
`elements is smaller than a shift register. As compared
`
`to a conventional organic EL display having two shift
`
`20
`
`registers serving as drivers,
`
`the organic EL diSplay 1
`
`of this embodiment can reduce the manufacturing cost
`
`and increase the yield.
`
`[Second Embodiment]
`
`An organic EL display according to the second
`
`25
`
`embodiment will be described next.
`
`Even in the second embodiment,
`
`the organic EL
`
`display comprises an organic EL display panel 2, data
`
`.
`
`.
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`driver 3, and selection scanning driver 5,
`
`like the
`
`organic EL display 1 according to the first embodiment
`
`shown in FIG. 1.
`
`The data driver 3, a display section
`
`4,
`
`the selection scanning driver 5, pixel circuits D1,1
`
`5
`
`to Dm,nr and light—emitting elements E1,l to Em,n have
`
`the same structures as those in the organic EL display
`
`1 of the first embodiment, and a detailed description
`
`thereof will be omitted in the second embodiment.
`
`In the second embodiment, a common signal power
`
`10
`
`supply 6 is arranged in a controller 11 connected to
`
`the organic EL display 1, as shown in FIG. 10.
`
`For
`
`this reason,
`
`the ratio of the occupied area of the
`
`pixels on the substrate of the organic EL display 1 can
`
`be increased.
`
`15
`
`The organic EL display 1 according to the second
`
`embodiment can operate in accordance with the waveform
`chart shown in FIG. 8, as in the first embodiment.
`
`[Third Embodiment]
`
`The third embodiment will be described next- This
`
`20
`
`embodiment is the same as the first embodiment except
`
`that a drain 22d of a second transistor 22 of a pixel
`
`circuit Di,j of each pixel Pi,j is not connected to a
`
`common signal supply line Zi but to a selection
`
`scanning line Xi, as shown in FIG. 11.
`
`The same
`
`25
`
`reference numerals as in the first embodiment denote
`
`the same parts in.the third embodiment, and a detailed
`
`description thereof will be omitted.
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`35150050: <WD___209401933“1_§_>
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`56
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`In the transistor 22,
`
`the drain electrode 22d and
`
`gate electrode 22g are connected to the selection
`
`‘
`
`_
`
`scanning line Xi. A.source electrode 228 is connected
`
`to a gate electrode 23g of a third transistor 23.
`
`The-
`
`transistor 22 is an N—channel amorphous silicon thin
`film transistor,
`like a first transistor 21 and the
`
`transistor 23.
`
`The transistor 22 operates upon receiving the
`
`voltage shown in the waveform chart in FIG. 8. That
`
`is, as shown in FIG. 12A, during a selection period
`
`TSE!
`
`the transistor 22 of each of pixels Pi,l to Pi,n
`
`is turned on by a scanning signal of an ONvlevel
`
`(high—levef} voltage VON from the selection scanning
`
`line Xi so that the voltage from the selection scanning
`
`line Xi is applied to the gate of the transistor 23.
`
`Simultaneously,
`
`the transistor 21 of each of the pixels
`
`Pi,l to Pi,n is turned on.
`
`In addition,
`
`the transistor
`
`23 of each of the pixels Pi,1 to Pi,n is turned on by
`
`the gate voltage applied by the transistor 22 during
`
`the selection period TSE- Hence,
`
`the data driver 3
`
`supplies a gray level designation current IDAIA to the
`
`paths between the drains 23d and the sources 235 of the
`
`10
`
`15
`
`20
`
`transistors 23 of the pixels Pi,1 to Pi,n and signal
`
`lines Y1 to Yn in the direction indicated by the arrow
`
`25
`
`in FIG. 12A.
`
`The current value of the gray level
`
`designation current IDAIA at this time corresponds to
`
`the gray level of a red digital gray level image signal
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`SR, green digital gray level image signal SS, and blue
`
`digital gray level image signal SB input to the data
`
`driver 3. Charges corresponding to the current value
`
`of the gray level designation current IDATA are stored
`in capacitors 24 connected to the paths between the
`
`5
`
`gates 23g and the sources 235 of the transistors 23 of
`
`the pixels Pi,1 to Pi,n during the selection period
`
`TSE.
`
`During a non-selection period TNSE:
`
`the transistor
`
`10
`
`21 and transistor 22 of each of the pixels 91,1 to Pi,n
`
`are turned off by a scanning signal of an OFF—level
`
`voltage VOFF supplied to the selection Scanning line
`
`Xi.
`
`A voltage VHIGH is applied to all common signal
`
`supply lines 21 to 3m-
`
`For this reason,
`
`the voltages
`
`15
`
`between the sources 235 and the drains 23d of all the
`
`transistors 23 are saturated.
`
`The voltages between the
`
`gates 23g and the sources 235 of all the transistors 23
`
`have a voltage value corresponding to the charges
`
`stored in the capacitors 24 during the selection period
`
`20
`
`TSE- As shown in FIG. 123, a driving current having a
`
`current value equal to the gray level designation
`
`current IDAIA flows between the sources 235 and the
`
`drains 23d of all the transistors 23.
`
`Since the
`
`voltage VHIGH is much higher than a reference voltage
`
`25
`
`V53,
`
`the driving current flows in the direction
`
`indicated by the arrow in FIG. 12A to cause
`
`light—emitting elements El,1 to Em,n to emit light.
`
`BNSDCBIDHWD
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`ZOO-IDIBBidn'I
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`58
`
`The present invention is not limited to the above
`
`embodiments. Various changes and modifications of
`
`design may be done without departing from the spirit
`
`and scope of the invention.
`
`5
`
`For example,
`
`in the above embodiments, all the
`
`first transistor 21, second transistor 22, and third
`
`transistor 23 of the pixel circuit Di,j are N—channel
`
`transistors. However, all_the transistors may be
`
`formed from P—channel transistors, and the anode and
`
`10
`
`cathode of the light—emitting element Ei,j may be
`
`connected in the reverse direction. At this time,
`
`the
`
`waveforms shown in FIG.
`
`8 are inverted.
`
`In the embodiments,
`
`the light*emitting period of
`
`the light—emitting elements 31,1 to Em,n is the
`
`15
`
`non-selection period TNSE between the selection periods
`
`TSE-
`
`the light—emitting period of the light—emitting
`
`element Ei,j
`
`is the m discontinuous non-selection
`
`periods TNSE between the_selection period TSE of the
`
`ith row and the selection period TSE of the next ith
`
`20
`
`row.
`
`As shown in FIG. 13, all the light—emitting
`
`elements E1!1 to Em,n may be simultaneously caused to
`
`emit light during the non-selection period TNSE after
`
`charges by the gray level designation current IDATA_are
`written in the capacitors 2a of all the light—emitting
`
`25
`
`elements El,l to Em’n. At this time, when at least one
`
`of the selection period TSE during one scanning period
`
`TSC and (m-l} reset periods TR when the reset voltage
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`59
`
`VRST is applied to the signal lines Y1 to Yn is set to
`
`be short,
`
`the non—selection period TNSEr i.e.,
`
`the
`
`light—emitting period of the light-emitting elements
`
`31,1 to Em,n can be made relatively long. Referring
`
`5
`
`to FIG. 13, after the selection scanning linexm is
`
`selected,
`
`to return the charges stored in the parasitic
`
`capacitances of the signal lines Y1 to Yn in the write
`
`mode of the pixels 3m,1 to Pm,n of the selection
`
`scanning line Xm,
`
`the reset voltage VEST may be applied
`
`10
`
`to increase the number of reset periods TR during one
`
`scanning period TSC to E.
`
`In the above embodiments, an organic EL element is
`
`used. However, any other lighteemitting element having
`
`rectification properties may be used. That is,
`
`the
`
`15
`
`light-emitting element may be an element which flows no
`
`current when a reverse bias voltage is applied but
`
`flows a current when a-forward bias voltage is applied,
`
`and also emits light at a luminance correspondence with
`
`the magnitude of the flowing current. An example of a
`
`20
`
`light—emitting element having rectification properties
`
`is an LED {Light Emitting Diode] element.
`
`In the above embodiments,
`
`the data driver 3 and
`
`selection scanning driver 5 operate on the basis of a
`
`clock signal input from the controller 11. However,
`
`25
`
`the clock signal CK3 that is output from the common
`
`signal power supply 6 and used as a common signal may
`
`be input to the selection scanning driver 5 as the
`
`ENSDCCID:<WD
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`60
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`clock signal CK2.
`In the above embodiments,
`
`.
`the number 0% times the
`
`common signal output from the common signal power
`
`supply 6 changes to low level, i.e.,
`
`the gray level
`
`designation current IDATA_iS supplied is one per
`
`selection period TSE- However,
`
`the number of times may
`
`be two or more per selection period TSE-
`
`According to the present invention, when a driving
`
`current flows to the light—emitting element,
`
`the
`
`10
`
`light-emitting element emits light.
`
`The current value
`
`of the driving current corresponds to the voltage held
`
`between the gates 23g and the source 233 of the
`
`transistor 23 of the pixel circuit.
`
`The voltage value
`
`is obtained by converting the current value of the
`
`designation current.
`
`For these reasons,
`
`the current
`
`value of the driving current coincides with the current
`
`value of the designation current.
`
`The light—emitting
`
`element emits light at a luminance depending on the
`
`current value of the designation current. That is,
`
`the
`
`light—emitting element emits light at a luminance set
`
`by the current value of the designation current.
`Hence,
`if the current value of the designation current
`
`does not change between pixels,
`
`the luminance does not
`
`vary between the plurality of light—emitting elements,
`
`and a high—quality image can be displayed.
`
`It is only the scanning driver 5 that supplies a
`
`selection signal to each scanning line.
`
`No drivers for
`
`15
`
`20
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`scanning are arranged at all.
`
`In addition,
`
`the common
`
`signal power supply 6 has a smaller number of elements
`
`than that of the scanning driver and therefore has a
`
`simple arrangement. Hence,
`
`the mounting.area of the
`
`5
`
`driver is small.
`
`msoocguewo
`
`“mam”,
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`
`CLAIMS
`
`1. A display device comprising:
`
`a plurality of scanning lines;
`
`a plurality of signal lines;
`
`a scanning driver which sequentially supplies to
`
`the scanning lines selection signals that select the
`
`scanning lines;
`
`a data driver which supplies a designation current
`
`to said plurality of signal lines within a selection
`
`10
`
`period when the scanning lines are being selected;
`
`a plurality of pixel circuits which supplies a
`
`driving current corresponding to a current value of the
`
`designation current that flows to the signal lines;
`
`a plurality of optical elements which emit light
`
`15
`
`in accordance with the driving current supplied by said
`
`plurality of pixel circuits; and
`
`a power supply which outputs to said plurality of
`
`pixel circuits a driving current reference voltage to
`
`supply the driving current.
`
`20
`
`2.
`
`A display device according to claim 1, wherein
`
`the power supply outputs the driving current reference
`
`voltage to said plurality of pixel circuits within a
`
`nonwselection period.
`
`3.
`
`A display device according to claim 2, wherein
`
`25
`
`the non—selection period is a period when none of said-
`
`plurality of optical elements are selected.
`
`4.
`
`A display device according to claim 2, Wherein
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`63
`
`a reset voltage is output to said plurality of signal
`
`lines within the non—selection period.
`
`5.
`
`A display device according to claim 1, wherein
`
`the power supply selectively outputs the driving
`
`5
`
`current reference voltage and a designation current
`
`reference voltage to supply the designation current.
`
`6.
`
`A display device according to claim 5, wherein
`
`the designation current reference voltage is lower than
`
`the driving current reference voltage.
`
`10
`
`7.
`
`A display device according to claim 5, wherein
`
`the power supply outputs the designation current
`
`reference voltage within the selection period.
`
`8.
`
`A display device according to claim 1, wherein
`
`the power supply alternately outputs a designation
`
`15
`
`current reference voltage to supply the designation
`
`current and the driving current reference voltage.
`
`9.
`
`A display device according to claim 1, wherein
`
`the data driver supplies the designation current
`
`to the signal lines and the pixel circuits on the basis
`
`20
`
`of a designation current reference voltage output from
`
`the power supply within the selection period, and
`
`each of the pixel circuits stores the current
`
`value of the designation current and supplies the
`
`driving current that is equal to the current value of
`
`25
`
`the designation current on the basis of the driving
`
`current reference voltage output from the power supply.
`
`10.
`
`A display device according to claim 1, wherein
`
`ansnocln;¢wu mwafi, . ,
`
`SAMSUNG EX. 1002 - 719/899
`SAMSUNG EX. 1002 - 719/899
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`
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`W0 2004(019314
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`PCTIJP2003IOJO644
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`64
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`each of the pixel circuits comprises a driving
`
`transistor and a capacitor which is connected between a
`
`gate and a source of the driving transistor,
`
`the data driver supplies the designation current
`
`5
`
`to the signal lines and the driving transistors of the
`
`pixel circuits on the basis of a designation current
`
`reference voltage output from the power supply within
`
`the selection period, and
`
`the capacitor stores charges corresponding to the
`
`10
`
`designation current between the gate and the source,
`
`and when the driving current reference voltage is input
`
`from the power supply,
`
`the driving transistor supplies
`
`the driving current corresponding to the charges stored
`
`between the gate and the source.
`
`15
`
`11. A display device according to claim 1, wherein
`
`each of the pixel circuits comprises
`
`a first transistor in which a gate is connected to
`
`the scanning line and one of a drain and a source is
`
`connected to the signal line,
`
`20
`
`a second transistor in which a gate is connected
`
`to the scanning line and a designation current
`
`reference voltage and the driving current reference
`
`voltage are selectively input to one of-a drain and a
`
`source, and
`
`25
`
`a driving transistor in which a gate is connected
`
`to the other of the drain and the source of the second
`
`transistor, one of a drain and a source is connected to
`
`SAMSUNG EX. 1002 - 720/899
`SAMSUNG EX. 1002 - 720/899
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`65
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`one of the drain and the source of the second
`transistor, and the other of the drain and the source‘
`
`is connected to the other of the drain and.the source
`
`of the first transistor and the optical element.
`
`5
`
`12. A display device according to claim 11,
`
`wherein the scanning driver selects the first
`
`transistor and the second transistor, which are
`
`connected to a predetermined scanning line, within the
`
`selection period.
`
`10
`
`13.
`
`A display device according to claim 1, wherein
`
`each of the piXel circuits comprises
`
`a first transistor in which a gate is connected to
`
`the scanning line and one of a drain and a source is
`
`connected to the signal line,
`
`15
`
`a second transistor in which a gate is connected
`
`to the scanning line and one of a drain and a source is
`
`connected to the scanning line, and
`
`a driving transistor in which a gate is connected
`
`to the other of the drain and the source of the second
`
`20
`
`transistor, one of a drain and a source is connected to
`
`the power supply, and the other of the drain and the
`
`source is connected to the other of the drain and the
`
`source of the first transistor and the optical element.
`
`14.
`
`A display device according to claim 13,
`
`25
`
`wherein the scanning driver selects the first
`
`transistor and the second transistor, which are
`
`connected to a predetermined scanning line, within the
`
`msnocm;mo_zoowmam._._.
`
`SAMSUNG EX. 1002 - 721/899
`SAMSUNG EX. 1002 - 721/899
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`PCTIJPZOOMO 106f14
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`66
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`selection period.
`
`15.
`
`A display device according to claim 1, wherein
`
`the power supply outputs the driving current reference
`
`voltage from the end of the selection period of a
`
`5
`
`predetermined scanning line till the beginning of the
`
`selection period of a next scanning line.
`
`16.
`
`A display device according to claim 1, wherein
`
`the optical element has a first electrode connected to
`
`the power supply through the pixel circuit and a second
`
`10
`
`electrode to which a reference voltage is applied.
`
`17.
`
`A display device according to claim 16,
`
`wherein
`
`the power supply selectively outputs the driving
`
`current reference voltage and a designation current
`
`15
`
`reference voltage to supply the designation current,
`
`and
`
`the driving current reference voltage is not less
`
`than the reference voltage, and the designation current
`
`reference voltage is not more than the reference
`
`20
`
`voltage.
`
`18.
`
`A display device according to claim 1, wherein
`
`the optical element is an organic EL element.
`
`19. A.display device comprising:
`
`a scanning line group having a scanning line of a
`
`25
`
`first row and a scanning line of a second row;
`
`an optical element group having a first optical
`
`element which is connected to the scanning line of the
`
`SAMSUNG EX. 1002 - 722/899
`SAMSUNG EX. 1002 - 722/899
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`67
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`first row and emits light in accordance with a current
`
`value of a first driving current supplied, and a second
`
`optical element which is connected to the scanning line
`
`of the second row and emits light in accordance with a
`
`5
`
`current value of a Second driving current supplied:
`
`a pixel circuit group having a first pixel circuit
`
`which is connected to the first optical element and
`
`supplies the first driving current equal to a current
`
`value of a first designation current supplied, and a
`
`10
`
`second pixel circuit which is connected to the second
`
`optical element and supplies the second driving current
`
`equal to a current value of a second designation
`
`current supplied; and
`
`a power supply which applies a driving current
`
`15
`
`reference voltage to supply the first driving current
`
`to the first optical element through the first pixel
`circuit and applies the driving current reference
`
`voltage to supply the second driving current to the
`
`second optical element through the second.pixel circuit
`
`20
`
`between a selection period of the scanning line of the
`
`first row and a selection period of the scanning line
`
`of the second row.
`
`20. A display device according to claim 19,
`
`wherein the power supply outputs the driving current
`
`25
`
`reference voltage to the optical element group within a
`
`non-selection period.
`
`21. A display device according to claim 20,
`
`ENSDCCID: duo—amommug
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`SAMSUNG EX. 1002 - 723/899
`SAMSUNG EX. 1002 - 723/899
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`W0 2004;019:514
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`-
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`PCTIJPZOO3IDIDS4-1
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`68
`
`wherein the non-selection period is a period when none
`
`of the optical elements of the optical element group.
`
`are selected.
`
`22.
`
`A display device according to claim 20,
`
`wherein a reset voltage is output to said plurality of
`signal lines within the non—selection period.
`
`23-
`
`A display device according to claim 19,
`
`wherein the power supply selectively outputs the
`
`driving current reference voltage and a designation
`
`10
`
`current reference voltage to supply the first and
`
`second designation currents to the first and second
`
`pixel circuits.
`
`24.
`
`.A display device according to claim 23,
`
`wherein the designation current reference voltage is
`
`15
`
`lower than the driving current reference voltage.
`
`25. A.display device according to claim 23,
`
`wherein the power supply outputs the designation
`
`current reference voltage within the selection period.
`
`26.
`
`A display device according to claim 19,
`
`20
`
`wherein the power supply alternately outputs a
`
`designation current reference voltage to supply the
`
`first and second designation currents and the driving
`
`current reference voltage.
`
`27.
`
`A display device according to claim 19,
`
`25
`
`further comprising a data driver which supplies the
`
`first and second designation currents to the first and
`
`second pixel circuits on the basis of a designation
`
`SAMSUNG EX. 1002 - 724/899
`SAMSUNG EX. 1002 - 724/899
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`
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`PCTIJP2003!010644
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`69
`
`current reference voltage output from the power supply
`
`within the selection period.
`
`28.
`
`A display device according to claim 21,
`
`further comprising a signal line which connects the
`
`5
`
`data driver to the pixel circuits.
`
`29. A.display device according to claim 19,
`
`wherein each of the pixel circuits stores the current
`
`value of the designation current supplied within the
`
`selection period and supplies the driving current that
`is equal to the current value of the designation
`
`10
`
`current on the basis of the driving current reference
`
`voltage output from the power supply after the
`
`selection period.
`
`30.
`
`.A display device according to claim 19,
`
`15.
`
`wherein
`
`each of the pixel circuits comprises a driving
`transistor and a capacitor which is_con$ected between a
`
`gate and a source of the driving transistor,
`
`the data driver supplies the designation current
`
`20
`
`to the driving transistors of the pixel circuits on the
`
`-we
`
`basis of a designation current reference voltage output
`
`from the power supply within the selection period, and
`
`the capacitor stores charges corresponding to the
`designation current between the gate and the source,
`
`'25
`
`and when the driving current reference voltage is input
`
`from the power supply,
`
`the driving transistor supplies
`
`the driving current corresponding to the charges stored
`
`BNSlech: <WO_'_20040|9:31Q1_|';
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`SAMSUNG EX. 1002 - 725/899
`SAMSUNG EX. 1002 ' 725/899
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`W0 2004;019:414
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`70
`
`between the gate and the source.
`
`31.
`
`A display device according to claim 19,
`
`wherein each of the pixel circuits comprises
`
`a first transistor in which a gate is connected to
`
`5
`
`one scanning line of the scanning line group and one of
`
`a drain and a source is connected to the data driver,
`
`a second transistor in which a gate is connected
`
`to the scanning line and a designation current
`
`reference voltage and the driving current reference
`
`10
`
`voltage are selectively input to one of a drain and a
`
`source, and
`
`a driving transistor in which a gate is connected
`
`to the other of the drain and the sourCe of the second
`
`transistor, one of a drain and a source is connected
`
`15
`
`to one of the drain and the source of the second
`
`transistor, and the other of the drain and the source
`is connected to the other of the drain and the source
`
`of the first transistor and one optical element of the
`
`optical element group.
`
`20
`
`32.
`
`A display device according to claim 3i,
`
`further comprising a selection scanning driver which
`
`selects the first transistor and the second transistor,
`
`which are connected to the predetermined scanning line
`
`of the scanning line group within the selection period.
`
`25
`
`33.
`
`A display device according to claim 19,
`
`wherein each of the pixel circuits comprises
`
`a first transistor in which a gate is connected to
`
`SAMSUNG EX. 1002 - 726/899
`SAMSUNG EX. 1002 - 726/899
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`W0 2004(019314
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`PCTIJP2003IO 10644
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`71
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`one scanning line of the scanning line group and one of
`
`a drain and a source is connected to the data driver,
`
`a second transistor in which a gate is connected
`
`to the scanning line and one of a drain and a source is
`
`5
`
`connected to the scanning line, and
`
`a driving transistor in which a gate is connected
`
`to the other of the drain and the source of the second
`
`transistor, one of a drain and a source is connected to
`
`the power supply, and the other of the drain and the
`
`10
`
`source is connected to the other of the drain and the
`
`source of the first transistor and one optical element
`
`of the optical element group.
`
`34.
`
`A display device according to claim 33,
`
`further comprising a selection scanning driver which
`
`15
`
`selects the first transistor and the second transistor,
`
`which are connected to the predetermined scanning line
`
`of the scanning line group within the selection period.
`
`35. A_display device according to claim 19,
`
`wherein the power supply outputs the driving current
`
`20
`
`reference voltage within a non—selection period between
`
`the selection period of a predetermined scanning line
`
`and the selection period of a next scanning line.
`
`36. A display device according to claim 19,
`
`wherein the optical element has a first electrode
`
`25
`
`connected to the power supply through the pixel circuit
`
`and a second electrode to which a reference voltage is
`
`applied.
`
`mm.o=.wo_mmm._._,
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`SAMSUNG EX. 1002 - 727/899
`SAMSUNG EX. 1002 - 727/899
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`W0 2004;1119314
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`PCTIJP2003J'010644
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`72
`
`37. A.display device according to claim 36,
`
`wherein
`
`the power supply selectively outputs the driving
`
`current reference voltage and the designation current
`
`5
`
`reference voltage to supply the first and second
`
`designation currents, and
`
`the driving current reference voltage is not less
`
`than the reference voltaget and the designation current
`
`reference voltage is not more than the reference
`
`10
`
`voltage.
`
`38. A display device according to claim 19,
`
`wherein the optical element is an organic EL element.
`
`39.
`
`A display device comprising:
`
`a plurality of scanning lines;
`
`15
`
`a scanning driver which sequentially supplies to
`
`the scanning lines selection signals that select one of
`
`said plurality of scanning lines;
`
`a plurality of pixel circuits each of which is
`
`connected to a corresponding one of said plurality of
`
`20
`
`scanning lines and supplies a driving current corre—
`
`sponding to a current value of the designation current;
`
`a plurality of optical elements each of which
`
`emits light in accordance with the driving current
`supplied by a corresponding one of said plurality of
`
`'25
`
`pixel circuits;
`
`a data driver which supplies the designation
`
`currents to the pixel circuits within a selection
`
`SAMSUNG EX. 1002 - 728/899
`SAMSUNG EX. 1002 - 728/899
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`73
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`period when the scanning lines are selected; and
`
`a common voltage output circuit which outputs to
`
`the selected pixel circuit a designation current
`
`reference voltage to supply the designation currents
`
`5
`
`within the selection period of_the scanning lines and
`
`outputs to said plurality of pixel circuits a driving
`
`current reference voltage to supply the driving
`
`currents within a non~selection period.
`
`40.
`
`A display device according to claim 39,
`
`10
`
`wherein the common voltage output circuit outputs the
`
`driving current reference voltage to all the'pixel
`
`circuits within the non—selection period.
`
`41.
`
`A display device according to claim 39,
`
`wherein the designation current reference voltage is
`
`15
`
`lower than the driving current reference voltage.
`
`42. A display device driving method comprising:
`
`a first designation current step of supplying a
`
`first designation current to a first driving transistor
`
`within a first selection period to store charges corre—
`
`20
`
`sponding to a current value of the first designation
`
`current between a gate and a source of the first
`
`driving transistor;
`
`a second designation
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