IPR2015-00863
`Petition for Inter Partes Review of U.S. Patent 7,202,843 - EXHIBIT 1001_Page 1
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`U.S. Patent
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`Apr. 10, 2007
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`Sheet 1 of 10
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`US 7,202,843 B2
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`Sheet 2 of 10
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`Apr. 10, 2007
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`Sheet 3 of 10
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`US 7,202,843 B2
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`U.S. Patent
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`Apr. 10, 2007
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`Sheet 4 of 10
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`US 7,202,843 B2
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`U.S. Patent
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`Apr. 10, 2007
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`Sheet 5 of 10
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`US 7,202,843 B2
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`U.S. Patent
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`Apr. 10, 2007
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`Sheet 6 of 10
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`US 7,202,843 B2
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`Apr. 10, 2007
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`Sheet 7 of 10
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`Apr. 10, 2007
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`Sheet 8 of 10
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`US 7,202,843 B2
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`Sheet 9 of 10
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`U.S. Patent
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`Apr. 10, 2007
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`Sheet 10 of 10
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`US 7,202,843 B2
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`1
`DRIVING CIRCUIT OF A LIQUID CRYSTAL
`DISPLAY PANEL AND RELATED DRIVING
`METHOD
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`BACKGROUND OF INVENTION
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`1. Field of the Invention
`
`The invention relates to a driving circuit of a liquid crystal
`display (LCD) panel and its related driving method, and
`more particularly, to a driving circuit for applying over two
`data impulses to a pixel electrode within one frame period,
`and its related driving method.
`2. Description of the Prior Art
`A liquid crystal display (LCD) has advantages of light-
`weight, low power consumption, and low divergence and is
`applied to various portable equipment such as notebook
`computers and personal digital assistants (PDAs). In addi-
`tion, LCD monitors and LCD televisions are gaining in
`popularity as a substitute for traditional cathode ray tube
`(CRT) monitors and televisions. However, an LCD does
`have some disadvantages. Because of the limitations of
`physical characteristics, the liquid crystal molecules need to
`be twisted and rearranged when changing input data, which
`can cause the images to be delayed. For satisfying the rapid
`switching requirements of multimedia equipment, improv-
`ing the response speed of liquid crystal is desired.
`Generally when driving an LCD, a driving circuit receives
`a plurality of frame data and then generates corresponding
`data impulses, scan voltages, and timing signals, according
`to the frame data, in order to control pixel operation of the
`LCD. Each of the frame data includes data for refreshing all
`of the pixels within a frame period; thus each of the frame
`data can be regarded as including a plurality of pixel data,
`and each of the pixel data is for defining the gray level that
`a pixel is required to reach within a frame period. In the
`general standard, each pixel can switch among 256 (28) gray
`levels, thus each of the pixel data is 8 bits in length.
`Please refer to FIG. 1 showing a timing diagram of pixel
`data values varying in accordance with the frames. When
`driving a pixel, the driving circuit receives a plurality of
`pixel data used for driving the pixel in sequence. As shown
`in FIG. 1, GN, GN+l, GN+2 are the pixel data received in
`frame periods N, N+l, N+2, and the driving circuit deter-
`mines the gray level of the pixel in the frame periods N,
`N+l, N+2 according to the values of the pixel data GN,
`GN+l, GN+2. In general, the larger the value of the pixel
`data is,
`the larger the gray level
`is. The driving circuit
`generates a data impulse corresponding to a frame period
`according to the pixel data GN, GN+l, GN+2, and applies
`the pulse to a pixel electrode of the corresponding pixel to
`have the pixel be in the appropriate gray level as required
`within each frame period.
`Please refer to FIG. 2 showing a timing diagram of
`different transmission rates of a pixel, varying in accordance
`with the frames. Two curves C1, C2 are measured when the
`driving circuit changes the transmission rate from T1 to T2
`beginning at frame period N. The curve C1 shows the
`transmission rate of a pixel not overdriven corresponding to
`the frames, and the curve C2 shows the transmission rate of
`the pixel overdriven corresponding to the frames. The U.S.
`published application No. 2002/0050965 is one of the ref-
`erences of the conventional overdriving method. There is a
`time delay when charging liquid crystal molecules, so that
`they cannot twist at a predetermined angle at a predeter-
`mined transmission rate. As shown by the curve C1, in the
`case of not being overdriven, the transmission rate cannot
`reach a predetermined level in the frame period N but has to
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`the frame period N+2. Such a delay causes
`wait until
`blurring. In order to improve that, some conventional LCD
`are overdriven, which means applying a higher or a lower
`data impulse to the pixel electrode to accelerate the reaction
`speed of the liquid crystal molecules, so that the pixel can
`reach the predetermined gray level in a predetermined frame
`period. As shown by the curve C2, in the case of being
`overdriven, although the reaction speed of the liquid crystal
`molecules is faster than in case of not being overdriven, the
`transmission rate has to wait until frame period N+1 to reach
`T2. Thus, the requirement of reaching T2 in the frame period
`N still remains unsatisfied.
`
`SUMMARY OF INVENTION
`
`It is therefore a primary objective of the claimed invention
`to provide a driving circuit of an LCD panel and its relating
`driving method to solve the problem mentioned above.
`Briefly,
`the present
`invention provides a method for
`driving an LCD panel. The LCD panel includes a plurality
`of scan lines, a plurality of data lines, and a plurality of
`pixels. Each pixel is connected to a corresponding scan line
`and a corresponding data line, and each pixel includes a
`liquid crystal device and a switching device connected to the
`corresponding scan line, the corresponding data line, and the
`liquid crystal device. The method includes receiving con-
`tinuously a plurality of frame data, generating a plurality of
`data impulses for each pixel in every frame period according
`to the frame data and applying the data impulses to the liquid
`crystal device of one of the pixels within one frame period
`via the data line connected to the pixel in order to control the
`transmission rate of the liquid crystal device of the pixel.
`The present invention further provides a driving circuit
`for driving an LCD panel including a blur clear converter for
`receiving frame data every frame period, each frame data
`comprising a plurality of pixel data and each pixel data
`corresponding to a pixel, the blur clear converter delaying
`current frame data to generate delayed frame data and
`generating a plurality of overdriven pixel data in every
`frame period for each pixel; a source driver for generating a
`plurality of data impulses to each pixel according to the
`plurality of overdriven pixel data generated by the blur clear
`converter and applying the data impulses to the liquid crystal
`device of the pixel via the scan line connected to the pixel
`in order to control the transmission rate of the liquid crystal
`device; and a gate driver for applying a scan line voltage to
`the switch device of the pixel so that the data impulses can
`be applied to the liquid crystal device of the pixel.
`These and other objectives of the present invention will
`no doubt become obvious to those of ordinary skill in the art
`after reading the following detailed description of the pre-
`ferred embodiment that is illustrated in the various figures
`and drawings.
`
`BRIEF DESCRIPTION OF DRAWINGS
`
`FIG. 1 is a timing diagram of the pixel data values varying
`in accordance with the frames according to the prior art.
`FIG. 2 is a timing diagram of different transmission rates
`of the pixel varying in accordance with the frames.
`FIG. 3 is a block diagram of a driving circuit and an LCD
`panel according to the present invention.
`FIG. 4 is a circuit diagram of the LCD panel.
`FIG. 5 is a timing diagram of pixel data values varying in
`accordance with frames.
`
`FIG. 6 is a timing diagram of the transmission rate of the
`pixel varying in accordance with the frames.
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`FIG. 7 is a block diagram of the blur clear converter
`according to the first embodiment of the present invention.
`FIG. 8 is a block diagram of the blur clear converter
`according to the second embodiment of the present inven-
`tion.
`
`FIG. 9 is a timing diagram of original pixel data received
`by the blur clear converter varying in accordance with the
`frames.
`
`FIG. 10 is a timing diagram of overdriven pixel data
`generated by the blur clear converter varying in accordance
`with the frames.
`
`DETAILED DESCRIPTION
`
`Please refer to FIG. 3 showing a block diagram of a
`driving circuit 10 and an LCD panel 30 according to the
`present invention. The driving circuit 10 is for driving the
`LCD panel 30, which includes a signal controller 12, a blur
`clear converter 14, a timing controller 16, a source driver 18,
`and a gate driver 20. The signal controller 12 is for receiving
`composite video signals Sc, which includes frame data and
`timing data for driving the LCD panel 30, and processing the
`composite video signals Sc to separate them into frame
`signals G and control signals C. Subsequently, the blur clear
`converter 14 continuously receives the control signals C and
`the frame data included in the frame signals G and generates
`processed frame signals G including a plurality of over-
`driven data according to the frame data. The timing con-
`troller 16 controls the source driver 18 and the gate driver 20
`according to the frame signals G and the control signals C
`so that the source driver 18 and the gate driver 20 generate
`corresponding data line voltages and scan line voltages
`according to the plurality of overdriven data included in the
`frame signals G in order to drive the LCD panel 30 to
`generate images corresponding to the composite video sig-
`nals Sc.
`
`Please refer to FIG. 4 showing a circuit diagram of the
`LCD panel 30. The LCD panel 30 includes a plurality of
`scan lines 32, a plurality of data lines 34, and a plurality of
`pixels 36. Each pixel 36 is connected to a corresponding
`scan line 32 and a corresponding data line 34, and each pixel
`36 has a switching device 38 and a liquid crystal device 39
`a.k.a. a pixel electrode. The switching device 38 is con-
`nected to the corresponding scan line 32 and the correspond-
`ing data line 34, and the source driver 18 and the gate driver
`20 control the operation of each pixel 36 via the scan line 32
`and the data line 34. To drive the LCD 30, scan voltages are
`applied to the scan lines 32 to turn on the switching devices
`38, and data voltages are applied to the data lines 34 and
`transmitted to the pixel electrodes 30 through the switching
`devices 38. Therefore, when the scan voltages are applied to
`the scan lines 32 to turn on the switching devices 38, the data
`voltages on the data lines 34 will charge the pixel electrodes
`39 through the switch devices 38, thereby twisting the liquid
`crystal molecules. When the scan voltages on the scan lines
`32 are removed to turn off the switching devices 38, the data
`lines 34 and the pixels 36 will disconnect, and the pixel
`electrodes 39 will remain charged. The scan lines 32 turn the
`switching devices 38 on and off repeatedly so that the pixel
`electrodes 39 can be repeatedly charged. Different data
`voltages cause different twisting angles and show different
`transmission rates. Hence,
`the LCD 30 displays various
`images.
`Please refer to FIG. 5 showing a timing diagram of pixel
`data values varying in accordance with frames. According to
`the present invention, when driving any pixel 36 of the LCD
`panel 30, the driving circuit 10 generates a plurality of pixel
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`data used for driving the pixel in sequence. As shown in FIG.
`5, GN, GN(2), GN+l, GN+l(2), GN+2, GN+2(2), GN+3,
`GN+3(2) are the pixel data generated in frame periods N,
`N+l, N+2, N+3. The driving circuit 10 generates two pieces
`of pixel data for each pixel 36 in every frame period. The
`driving circuit 10 drives the pixel to reach gray levels in the
`frame periods N, N+l, N+2, N+3 according to the values of
`the pixel data GN—GN+2(2). For instance, when the pixel
`data GN, GN(2) are generated, the source driver of the
`driving circuit 10 converts the pixel data GN, GN(2) into
`two corresponding data impulses and then applies them to
`the liquid crystal device 39 via the data line 32 in the frame
`period N in order to control the transmission rate of the
`liquid crystal device 39. Similarly, data impulses corre-
`sponding to the pixel data GN+l—GN+3(2) are applied
`respectively to corresponding pixel electrodes 39 every half
`a frame period. Same as the prior art, the larger the value of
`the pixel data is, the higher the voltage of the corresponding
`data impulse is, and the larger the gray level value is.
`Please refer to FIG. 6 showing a timing diagram of the
`transmission rate of the pixel 36 varying in accordance with
`the frames. As described above,
`the driving circuit 10
`generates two pieces of pixel data in each frame period, and
`then the source driver 18 generates two corresponding data
`impulses according to the two pieces of pixel data and
`applies them to the pixel electrode 39 of the corresponding
`pixel 36 in order to control the transmission rate and gray
`level of the pixel electrode 39. As shown in FIG. 6, the
`driving circuit 10 changes the transmission rate of the pixel
`electrode 39 of a pixel 36 from T1 to T2 in the frame period
`N+l. The pixel electrode 39 is applied with two data
`impulses corresponding to the pixel data GN+l, GN+l(2) in
`the frame period N+l at a time interval of half a frame
`period. As shown in FIG. 6, although the transmission rate
`of the pixel electrode 39 cannot reach T2 in the first half
`period n+2 of the frame period N+l, in the later half period
`n+3 of the frame period N+l,
`the pixel electrode 39 is
`applied with another data impulse, so that the transmission
`rate can reach T2 in the frame period N+l as required.
`Therefore, blurring will not occur.
`In the present embodiment, the two pieces of pixel data of
`each pixel in every frame period are generated by the blur
`clear converter 14. Please refer to FIG. 7 showing a block
`diagram of the blur clear converter 14. The blur clear
`converter 14 includes a multiplier 40, a processing circuit
`42, a first image memory 44, a second image memory 46, a
`first memory controller 48, and a second memory controller
`50. The multiplier 40 is for doubling the frequency of the
`control signal C to generate a multiplied signal C2. The first
`image memory 44 is controlled by the first memory con-
`troller 48 to delay current pixel data Gm for a frame period
`to generate delayed pixel data Gm—l according to the
`control signal C. The processing circuit 42 generates a
`plurality of overdriven pixel data GN according to the
`current pixel data Gm and the delayed pixel data Gm—l. The
`second image memory 46 stores the overdriven pixel data
`GN, and the second memory controller 50 controls the
`second image memory 46 to output two overdriven pixel
`data GN, GN(2) to each pixel 36 within a frame period
`according to the multiplied signal C2 in order to have the
`source driver 18 apply two data impulses to a specific pixel
`36 within a frame period according to the two overdriven
`pixel data GN, GN(2).
`Please refer to FIG. 8 showing a block diagram of the blur
`clear converter 60 according to the second embodiment of
`the present invention. The blur clear converter 60 functions
`the same as the blur clear converter 14, which includes a
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`5
`multiplier 62, a first image memory 66, a second image
`memory 68, a third image memory 70, a memory controller
`64, a processing circuit 74, and a comparing circuit 72. The
`multiplier 62 is for doubling the frequency of the control
`signal C to generate a multiplied signal C2. The first image
`memory 66 is for receiving and temporarily storing a
`plurality of pixel data G. The second image memory 68
`delays the plurality of pixel data G for a frame period to
`generate delayed pixel data Gm—l. The third image memory
`70 delays the pixel data Gm—l for a frame period to generate
`delayed pixel data Gm—2. Thus the pixel data Gm—2 lags the
`pixel data Gm—l for a frame period, and so does the pixel
`data Gm—l with respect to the pixel data Gm. The memory
`controller 64 controls the second image memory 68 and the
`third image memory 70 to output two overdriven pixel data
`in each frame period according to the multiplied signal C2.
`The processing circuit 74 generates two pieces of overdriven
`pixel data GN1, GN—l(2) for each pixel 36 in every frame
`period according to the pixel data Gm—l, Gm—2. The
`comparing circuit 72 compares the pixel data Gm—l with the
`pixel data Gm—2 to determine the values of the overdriven
`pixel data GN—l, GN—l(2).
`Please refer to FIG. 9 showing a timing diagram of
`original pixel data received by the blur clear converter 60
`varying in accordance with the frames, and FIG. 10 showing
`a timing diagram of overdriven pixel data generated by the
`blur clear converter 60 varying in accordance with the
`frames. As shown in FIG. 9, the original pixel data received
`by the blur clear converter 60 in the frame periods N and
`N+l are respectively Gm and Gm+l, with a difference Dilf
`between each other. The blur clear converter 60 generates
`the two overdriven pixel data GN+l, GN+l(2) with a
`difference AG between each other according to the original
`pixel data Gm, Gm+l. The difference AG is determined by
`the comparing circuit 72 in FIG. 8 for driving the pixels 36
`according to difference conditions. The difference AG is
`determined according to the difference Dilf between the
`original pixel data Gm and Gm+l. For instance, when the
`difference Dilf is less than a specific value, the comparing
`circuit 72 determines the difference AG as 0, that is equating
`the overdriven pixel data GN+l to the overdriven pixel data
`GN+l(2). Or when the difference Diff is larger than a
`specific value,
`the comparing circuit 72 modulates the
`difference AG to drive the LCD panel 30 properly.
`In contrast to the prior art, the present invention discloses
`a driving circuit and relating driving method to generate two
`pieces of pixel data in each frame period for every pixel on
`an LCD panel and then to generate two data impulses
`according to the two pieces of pixel data and to apply them
`to each pixel within a frame period in order to change the
`transmission rate of a pixel electrode. Thus, each of the
`pixels of the LCD panel is applied of a plurality of data
`impulses within a frame period, so that liquid crystal mol-
`ecules of the pixels can twist to reach a predetermined gray
`level within a frame period, and blurring will not occur.
`Those skilled in the art will readily observe that numerous
`modifications and alterations of the device and method may
`be made while retaining the teachings of the invention.
`Accordingly, the above disclosure should be construed as
`limited only by the metes and bounds of the appended
`claims.
`
`The invention claimed is:
`
`1. A driving circuit for driving an LCD panel, the LCD
`panel comprising:
`a plurality of scan lines;
`a plurality of data lines; and
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`a plurality of pixels, each pixel being connected to a
`corresponding scan line and a corresponding data line,
`and each pixel comprising a liquid crystal device and a
`switching device connected to the corresponding scan
`line, the corresponding data line, and the liquid crystal
`device,
`the driving circuit comprising:
`a blur clear converter for receiving frame data every frame
`period, each frame data comprising a plurality of pixel
`data and each pixel data corresponding to a pixel, the
`blur clear converter delaying current frame data to
`generate delayed frame data and generating a plurality
`of overdriven pixel data within every frame period for
`each pixel;
`a source driver for generating a plurality of data impulses
`to each pixel according to the plurality of overdriven
`pixel data generated by the blur clear converter and
`applying the data impulses to the liquid crystal device
`of the pixel via the scan line connected to the pixel
`within one frame period in order to control transmis-
`sion rate of the liquid crystal device; and
`a gate driver for applying a scan line voltage to the switch
`device of the pixel so that the data impulses can be
`applied to the liquid crystal device of the pixel.
`2. The driving circuit of claim 1 wherein the blur clear
`converter further comprises:
`a multiplier for multiplying a frequency of a control signal
`to generate a multiplied signal;
`a first image memory for delaying the pixel data for a
`frame period;
`a processing circuit for generating the plurality of over-
`driven pixel data according to the pixel data and the
`pixel data delayed by the first image memory;
`a second image memory for storing the overdriven pixel
`data;
`a memory controller for controlling the second image
`memory according to the multiplied signal to output the
`plurality of overdriven pixel data to any pixel so that
`the source driver generates the data impulses to each
`pixel within one frame period according to the over-
`driven pixel data output by the second image memory.
`3. The driving circuit of claim 1 wherein the blur clear
`converter further comprises:
`a multiplier for multiplying a frequency of a control signal
`to generate a multiplied signal;
`a first image memory for receiving and temporarily stor-
`ing the pixel data;
`a second image memory for delaying the pixel data stored
`and output by the first
`image memory for a frame
`period;
`a third image memory for delaying the pixel data stored
`and output by the second image memory for a frame
`period;
`a memory controller for controlling the second image
`memory and the third image memory according to the
`multiplied signal;
`a processing circuit for generating the plurality of over-
`driven pixel data according to the pixel data delayed
`and output by the second image memory and the third
`image memory; and
`a comparing circuit for comparing the pixel data delayed
`by the second image memory with the pixel data
`delayed by the third image memory in order to deter-
`mine data values of the overdriven pixel data generated
`by the processing circuit.
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`US 7,202,843 B2
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`7
`4. A method for driving a liquid crystal display (LCD)
`panel, the LCD panel comprising:
`a plurality of scan lines;
`a plurality Of data lines; and
`a plurality Of piXelS, eaCl1 piXel being COI1I1eCted t0 a
`corresponding scan line and a corresponding data line,
`and each pixel comprising a liquid crystal device and a
`switching device connected to the corresponding scan
`lime.’ the Carresponding data line’ and the liquid Crystal
`ev1ce, an
`the method comprising:
`receiving continuously a plurality of frame data;
`generating a plurality of data impulses for each pixel
`within every frame period according to the frame data;
`and
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`5
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`10
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`15
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`applying the data impulses to the liquid crystal device of
`one of the pixels within one frame period via the data
`line connected to the pixel in order to control a trans-
`mission rate of the liquid crystal device of the pixel.
`5. The method of claim 4 further comprising:
`delaying the frame data to generate a plurality of corre-
`sponding delayed frame data; and
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`8
`comparing current frame data and corresponding delayed
`data to determine voltage values of the data impulses
`when generating the data impulses.
`6. The method of claim 5 wherein the data impulses are
`a first data impulse and a second data impulse applied to the
`liquid crystal device of the pixel in sequence within the
`frame period,
`7. The method of Claim 6 further Comprising:
`determining a difference between the first data impulse
`and the second data impulse according to the current
`frame data and the corresponding delayed frame data.
`8. The method of claim 4 further comprising:
`applying a scan line voltage to the switch device of the
`pixel via the scan line connected to the pixel in order to
`have the data impulses be applied to the liquid crystal
`device of the pixel.
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`9- The ihethed 0f elaiih 4 Wheieih eaeh fiaihe data
`e0ihPii5e5 a Plufality Of Pixel data: ahd eaeh Pixel data
`20 e0iie5P0hd5 t0 a Pixel-
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