IPR2015-00862
`Petition for Inter Partes Review of U.S. Patent 7,202,843 - EXHIBIT 1005_Page 1
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`(19) Japanese Patent Office (JP)
`(12) Kokai Unexamined Patent Application Bulletin (A)
`(11) Laid Open Patent Application No.
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`2002-132224
`(43) Publication Date
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`May 9, 2002
`Number of Claims
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`5 OL
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`Number of Pages
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`25
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`Examination Request
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`not yet made
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`(51)
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`Int. Cl.7
`G09G 3/36
`G02F 1/133
`G09G 3/20
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`Identification Code
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`550
`611
`621
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`FI
`G09G 3/36
`G02F 1/133
`G09G 3/20
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`Theme Code (Ref.)
`2H093
`5C006
`5C080
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`Continued on the last page
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`000005108
`Hitachi Ltd.
`4-6 Kanda surugadai, Chiyoda-
`ku, Tokyo-to
`000233136
`Hitachi Video & Inf Syst Inc.
`292 Yoshidacho, Totsuka-ku,
`Yokohama-shi, Kanagawa-ken
`NITTA, Hiroyuki
`Hitachi Ltd.
`1099 Ozenji, Asou-ku,
`Kawasaki-shi, Kanagawa-ken
`100087170
`Patent Attorney, TOMITA,
`Kazuko
`Continued on the last page
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`550
`611J
`621K
`621F
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`(21) Application No.:
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`2000-324087
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`(71)
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`Applicant:
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`(22) Application Date:
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`October 24, 2000
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`(71)
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`Applicant:
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`Inventor:
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`(74)
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`Agent:
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`(54) [Title of Invention] Liquid Crystal Display Device and
`Liquid Crystal Drive Method
`
`(57) [Abstract]
`[Problem] To provide a liquid crystal drive method that can
`accelerate the liquid crystal response speed to 1 frame or less,
`and to provide a high-picture-quality, low-cost liquid crystal
`display device that makes use of this method.
`[Means for Solving the Problems] One conventionally
`driven frame is divided into two fields and drive is done at
`double-speed drive, together with which, in the first field the
`display data is corrected by a predetermined conversion
`method, corrected display data is computed, and driving is
`done with the corrected display data, and in the second field
`driving is done with display data on which the data conversion
`is not carried out, whereby a response is made possible
`wherein, in the first field the response changes from display-
`OFF up to a brightness that corresponds to the converted
`display data (the target-reaching brightness), and in the
`second field this target-reaching brightness is maintained;
`moreover the resolution of the display data that is input is
`made to correspond to the resolution of the liquid crystal
`panel, and display is performed with the lines enlarged.
`
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`Page 2
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`[Claims]
`[Claim 1] In a liquid crystal display device that has a liquid
`crystal panel that has multiple signal lines and multiple scan
`lines, a signal driver circuit that conveys to the signal lines the
`display voltage that corresponds to the liquid crystal display
`data, a scan driver circuit that conveys scan instruction
`signals to the scan lines, and a liquid crystal control circuit
`that converts display control signals (input control signals)
`and display data (input display data) that are supplied from
`outside into liquid crystal control signals and liquid crystal
`display data for driving the signal driver circuit and scan driver
`circuit,
`a liquid crystal display device characterized in that: the liquid
`crystal control circuit has a display data conversion means
`that converts the input display data by a predetermined
`conversion method and outputs corrected
`liquid crystal
`display data;
`one frame interval, which is the time for one period of the
`input control signal, is divided into N parts (where N is an
`integer greater than or equal to 2, and the interval of one
`division is taken to be a field); and
`included in the N fields that are included in one such frame
`interval are fields driven with corrected liquid crystal display
`data that is conversion processed by the display data
`conversion means, and fields driven with liquid crystal display
`data that is not conversion processed by the display data
`conversion means.
`[Claim 2] In the liquid crystal display device recited in claim 1,
`a liquid crystal display device characterized in that the liquid
`crystal control circuit further has:
`a control signal conversion means that converts the liquid
`crystal control signals to be output to L-times the speed of the
`input control signals (where L is an integer greater than or
`equal to 2 and less than or equal to N); and
`a display data conversion means that converts the input
`display data into liquid crystal display data of L-times the
`speed with respect to the input display data.
`[Claim 3] In the liquid crystal display device recited in claim 1,
`a liquid crystal display device characterized in that, if the input
`control signal and input display data are based on interlaced
`video signals supplied from outside, then
`the odd-number and even-number fields of the one-frame
`interval are each divided into N parts (one divided interval is
`taken to be a subfield);
`included in the N subfields that are included in the odd-
`number fields are, for odd-number lines, fields that are driven
`with corrected liquid crystal display data that is conversion
`processed by the display data conversion means, and fields
`that are not liquid crystal driven; and
`included in the N subfields that are included in the even-
`number fields are, for even-number lines, fields that are
`driven with corrected liquid crystal display data that is
`conversion processed by the display data conversion means,
`and fields that are not liquid crystal driven.
`[Claim 4] In a liquid crystal display device as recited in any of
`claims 1 to 3, a liquid crystal display device characterized in
`that the scan driver circuit has a configuration with which
`multiple scan lines can be selected simultaneously.
`[Claim 5] In a drive method for a liquid crystal panel that has
`multiple signal lines and multiple scan lines,
`a liquid crystal drive method characterized in that one frame
`interval, which is the time for one period for displaying one
`screen, is divided into N parts (where N is an integer greater
`than or equal to 2, and the interval of one division is taken to
`be a field);
`
`(2) JP-2002-132224-A
`
`the scan lines are given a scan selection signal at L-times
`speed (where L is an integer greater than or equal to 2 and
`less than or equal to N); and
`the signal lines in M fields (where M is an integer and M<N)
`are given a display voltage that corresponds to the corrected
`liquid crystal display data that is converted according to an L-
`times speed preset conversion relationship, with respect to
`the input display data, and in J fields (where J is an integer
`and is less than or equal to (N-M)) are given a display voltage
`that corresponds to the input display data.
`[Detailed Description of the Invention]
`[0001]
`[Technical Field to which the Invention Belongs] The
`present invention relates to a liquid crystal display device and
`a drive method therefor; in particular, it concerns a liquid
`crystal display device drive method that can display moving
`pictures with high picture quality in an active matrix liquid
`crystal display device.
`[0002]
`[Prior Art] TFT liquid crystal displays, which are active matrix
`liquid crystal display devices, are widely used as display
`devices
`in notebook computers and other
`information
`equipment, due to their feature of being easy on the eye, in
`addition to their low power consumption, thinness, and light
`weight. But with the trend toward multimedia in recent years,
`upon displaying television images on a liquid crystal display,
`or displaying moving pictures such as playing a digital video
`disk (DVD), because of the slow response speed in displaying
`intermediate gradations, afterimages occur, and the display
`properties are degraded. Thus, the challenge in adapting TFT
`liquid crystal displays to multimedia is to solve these problems.
`[0003] Making the liquid crystal response speed faster has
`been raised as one challenge in adapting liquid crystal display
`devices to moving pictures. In liquid crystal display devices
`that make use of liquid crystal and are usually in wide use, the
`response speed of the liquid crystal material is equal to or
`slower than the frame period of the display signal. Because of
`this, afterimages or moving-picture blurriness occurs in
`moving picture display, and adequate display performance is
`not obtained. For example, for a moving picture display as
`shown in FIG. 2 in which a circular mark (the display example
`in the drawing) is moved across a liquid crystal display screen,
`the display brightness of the liquid crystal at point A in the
`drawing (the chart in the lower right) lags behind the given
`display data (the chart in the upper right) timewise, which
`makes it difficult to produce a high-picture-quality moving
`picture display.
`[0004] In light of this challenge, JP-11-044874-A discloses an
`example of a drive method that improves the response speed
`by superimposing on the display signal a signal that
`emphasizes changes in the display signal.
`[0005]
`[Problems to Be Solved by the Invention] The above prior
`art drive method improves the response speed of the liquid
`crystal, but it assumes that the signal for one-frame-interval
`emphasis is constant and assumes control of each individual
`frame. Thus the acceleration of the response speed has not
`been adequate, and it has been impossible to accelerate the
`response speed to one frame period or less.
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`[0006] Furthermore, because, with the above prior art method,
`the response speed cannot be accelerated to one frame
`period or less, even if the liquid crystal material is made faster
`and the response speed becomes equal to the frame period,
`if the above prior art drive method is used, the response
`speed actually slows down, and it has been impossible to
`improve the picture quality.
`[0007] Furthermore, trying to accelerate the liquid crystal
`response speed by improving the liquid crystal material and
`the structure of the liquid crystal panel has been one reason
`why the manufacturing yield for liquid crystal panels is
`reduced.
`[0008] The object of the present invention, which was made
`with the above problems in mind, is to provide a liquid crystal
`drive method that makes it possible for the response speed of
`the liquid crystal to be one frame period or less, and to
`provide a high-picture-quality liquid crystal display device that
`can be manufactured at low cost using this method.
`[0009]
`[Means for Solving the Problems] In order to achieve this
`object, in a liquid crystal display device that has a liquid
`crystal panel that has multiple signal lines and multiple scan
`lines, a signal driver circuit that conveys to the signal lines the
`display voltage that corresponds to the liquid crystal display
`data, a scan driver circuit that conveys scan instruction
`signals to the scan lines, and a liquid crystal control circuit
`that coverts display control signals (input control signals) and
`display data (input display data) that are supplied from
`outside into liquid crystal control signals and liquid crystal
`display data for driving the signal driver circuit and scan driver
`circuit, the present invention is characterized in that: the liquid
`crystal control circuit has a display data conversion means
`that converts the input display data by a predetermined
`conversion method and outputs corrected
`liquid crystal
`display data; one frame interval, which is the time for one
`period of the input control signal, is divided into N parts
`(where N is an integer greater than or equal to 2, and the
`interval of one division is taken to be a field); and included in
`the N fields that are included in one such frame interval are
`fields driven with corrected liquid crystal display data that is
`conversion processed by the display data conversion means,
`and fields driven with liquid crystal display data that is not
`conversion processed by the display data conversion means.
`[0010] Furthermore, in the above liquid crystal display device
`of the present invention, the configuration is preferably such
`that the liquid crystal control circuit further has: a control
`signal conversion means that converts the liquid crystal
`control signals to be output to L-times the speed of the input
`control signals (where L is an integer greater than or equal to
`2 and less than or equal to N); and a display data conversion
`means that converts the input display data into liquid crystal
`display data of L-times the speed with respect to the input
`display data.
`[0011] Furthermore, in the above liquid crystal display device
`of the present invention, the configuration is preferably such
`that, if the input control signal and input display data are
`based on interlaced video signals supplied from outside, then
`the odd-number and even-number fields of the one-frame
`interval are each divided into N parts (one divided interval is
`taken to be a subfield); included in the N subfields that are
`included in the odd-number (even number) fields are, for odd-
`number (even number) lines, fields that are driven with
`corrected
`liquid crystal display data that is conversion
`processed by the display data conversion means, and fields
`that are not liquid crystal driven.
`
`(3) JP-2002-132224-A
`
`[0012] Furthermore, in the above liquid crystal display device
`of the present invention, the configuration may be such that
`the scan driver circuit has a configuration with which multiple
`scan lines can be selected simultaneously to display one line
`of data from the input display data on multiple lines of the
`liquid crystal panel.
`[0013] Furthermore, in order to achieve the above object, In a
`drive method for a liquid crystal panel that has multiple signal
`lines and multiple scan lines, the present invention is
`characterized in that: one frame interval, which is the time for
`one period for displaying one screen, is divided into N parts
`(where N is an integer greater than or equal to 2, and the
`interval of one division is taken to be a field); the scan lines
`are given a scan selection signal at L-times speed (where L is
`an integer greater than or equal to 2 and less than or equal to
`N); and the signal lines in M fields (where M is an integer and
`M<N) are given a display voltage that corresponds to the
`corrected
`liquid crystal display data
`that
`is converted
`according to an L-times speed preset conversion relationship,
`with respect to the input display data, and in J fields (where J
`is an integer and is less than or equal to (N-M)) are given a
`display voltage that corresponds to the input display data.
`[0014]
`[Embodiments of the Invention] In the present invention, in
`order to accelerate the brightness response of the liquid
`crystal, one frame is divided timewise into multiple parts; for
`example, the control is such that in the first division interval
`(the first field) the response changes from display-OFF to a
`brightness that corresponds to pre-converted corrected liquid
`crystal display data (the target-reaching brightness), and in
`the second division interval (the second field), the target-
`reaching brightness is displayed.
`[0015] Also, liquid crystal display devices often perform
`display having received display signals from a personal
`computer or the like, but such display signals have a different
`resolution from television signals such as NTSC signals. This
`is why, in a television device in which mainly moving picture
`display is performed, when using a liquid crystal display
`device
`instead of a CRT display device, a resolution
`conversion means is needed for displaying the display signals
`of these different resolutions in the same way.
`[0016] The present invention has been given a configuration
`in which it controls a scan driver serving as such a resolution
`conversion means so that multiple scan lines can be selected
`simultaneously. Such a configuration makes it possible to
`adapt the resolution of the display data that is input to the
`resolution of the liquid crystal panel and to display lines
`enlarged.
`[0017] The main modes of embodiment of the present
`invention are as follows.
`[0018] In one mode of embodiment, the present invention is
`characterized in that, in a liquid crystal display device that is
`configured with a liquid crystal panel that has multiple signal
`lines and multiple scan lines that are arranged perpendicular
`to each other; a signal driver circuit that conveys to the signal
`lines, by way of write signals, the display voltage that
`corresponds to the liquid crystal display data; a scan driver
`circuit that captures leading line signals from the scan line
`signals and, in sequence, conveys scan instruction signals to
`the scan lines; and a liquid crystal control circuit that converts
`display control signals (input control signals) and display data
`(input display
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`data) that are supplied from a personal computer or the like
`into liquid crystal control signals and liquid crystal display data
`for driving the signal driver circuit and scan driver circuit: one
`frame interval, which is the time for one period of the input
`control signal, is divided into N parts (where N is an integer
`greater than or equal to 2, and the interval of one division is
`taken to be a field); the liquid crystal control circuit has a
`display data storage circuit and a display data conversion
`circuit; the liquid crystal control signals that are to be output
`are converted to L-times the speed of the input control signals
`(where L is an integer greater than or equal to 2 but less than
`or equal to N); in M fields (where M is an integer but M<N),
`using the display data storage circuit, a conversion is made to
`liquid crystal display data at N-times the speed with respect to
`the input display data, and in addition, with the display data
`conversion circuit the data is converted to corrected liquid
`crystal display data using a preset conversion relationship; in
`the remaining J fields (where J is a integer but J is less than
`or equal to (N-M)), the input display data, without being
`converted, is output unchanged as liquid crystal display data;
`and display is performed with the liquid crystal control signals
`and liquid crystal display data.
`[0019] Also, in another mode of embodiment, the liquid
`crystal display device of the present invention is characterized
`in that one frame interval is divided into two parts (one divided
`interval is taken to be one field); the liquid crystal control
`circuit has a display data storage circuit and a display data
`conversion circuit; the liquid crystal control signals to be
`output are converted to twice the speed of the input control
`signals; in the first field, using the display data storage circuit,
`a conversion is made to liquid crystal display data of twice the
`speed with respect to the input display data, and in addition,
`with the display data conversion circuit, the data is converted
`into corrected liquid crystal display data according to a preset
`conversion relationship; and in the second field, the input
`display data, without being converted, is output unchanged as
`liquid crystal display data.
`[0020] Also, in another mode of embodiment, the liquid
`crystal display device of the present invention is characterized
`in that one frame interval is divided into three parts (one
`divided interval is taken to be one field); the liquid crystal
`control circuit has a display data storage circuit and a display
`data conversion circuit; the liquid crystal control signals to be
`output are converted to twice the speed of the input control
`signals; in the first field, using the display data storage circuit,
`a conversion is made to liquid crystal display data of twice the
`speed with respect to the input display data, and in addition,
`with the display data conversion circuit, the data is converted
`into corrected liquid crystal display data according to a preset
`conversion relationship; in the second field, the input display
`data, without being converted, is output unchanged as liquid
`crystal display data; and in the third field, no liquid crystal
`driving is done.
`[0021] Also, in another mode of embodiment, the liquid
`crystal display device of the present invention is characterized
`in that it receives display control signals (input control signals)
`and display data (input display data) that are supplied from
`NTSC or other interlaced video signals; the interval of the
`odd-number
`field, where odd-number display
`lines are
`supplied, and the interval of the even number field, where
`even-number display lines are supplied, are each divided into
`N parts (where N is an integer greater than or equal to 2, and
`one divided interval is taken to be a subfield); and the liquid
`crystal control circuit has a display data storage circuit and a
`display data conversion circuit.
`
`(4) JP-2002-132224-A
`
`[0022] In addition, in the above liquid crystal display device of
`the present invention, which receives interlaced video signals,
`it is desirable that, in the above odd-number (even-number)
`field, for display data for odd-number (even-number) lines, the
`liquid crystal control signals to be output are converted to N
`times the speed of the input control signals; in M subfields
`(where M is an integer and M<N), using the display data
`storage circuit, a conversion is made to liquid crystal display
`data of N times the speed with respect to the input display
`data, and in addition, with the display data conversion circuit,
`with the data, conversion is made to corrected liquid crystal
`display data according to a preset conversion relationship; in
`J subfields (where J is an integer and is less than or equal to
`(N-M)), no liquid crystal driving is done; for the display data of
`even-number (odd-number) lines, the liquid crystal control
`signals to be output are converted to N times the speed of the
`input control signals; using the display data storage circuit, in
`M subfields (where M is an integer and M<N) a conversion is
`made to liquid crystal display data of N times the speed with
`respect to the input display data, and input display data is
`output unchanged as liquid crystal display data without being
`converted; and in the remaining (N-M) subfields, no liquid
`crystal driving is done.
`[0023] Also, in another mode of embodiment, the liquid
`crystal display device of the present invention receives
`display control signals (input control signals) and display data
`(input display data) supplied from NTSC or other interlaced
`video signals; the interval of odd-number fields and of even-
`number fields is divided into three parts (one divided interval
`is taken to be a subfield); and the liquid crystal control circuit
`has a display data storage circuit and a display data
`conversion circuit.
`[0024] Here, in the odd-number (even-number) fields, for the
`display data of an odd-number (even-number) line, the liquid
`crystal control signals to be output are converted to three
`times the speed of the input control signals; in one subfield a
`conversion is made to liquid crystal display data of three times
`the speed with respect to the input control signals, and in
`addition, with the data, a conversion is made to corrected
`liquid crystal display data according to a preset conversion
`relationship; in one field, the input display data is not
`converted and is output unchanged as liquid crystal display
`data while in the remaining one field no driving is done; for the
`display data of even-number (odd-number) lines, the liquid
`crystal control signals to be output are converted to three
`times the speed of the input control signals; in one subfield, a
`conversion is made to liquid crystal display data of three times
`the speed with respect to the input display data, and the input
`display data is output unchanged as liquid crystal display data
`without being converted; and in the remaining two fields, no
`liquid crystal driving is done.
`[0025] Also, in the liquid crystal display device of the present
`invention in each of the above modes of embodiment, the
`configuration may be such that the scan driver circuit selects
`multiple scan lines simultaneously and one line of data from
`the input display data is displayed on multiple lines of the
`liquid crystal panel.
`[0026] Also, in another mode of embodiment, the present
`invention has multiple signal lines and multiple scan lines, and
`is characterized in that, in a liquid crystal drive method in
`which display is performed by conveying to the signal lines
`the display voltage that corresponds to the liquid crystal
`display data while conveying scan instruction signals to the
`scan lines, in sequence, beginning with the leading line: one
`frame interval,
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`(5) JP-2002-132224-A
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`about 16 ms to several tens of ms. Furthermore, in the
`following description, if a suffix such as -1 or -2 is omitted, the
`symbol represents the inclusive term.
`[0034] Also, in FIG. 3, 120 is a set of display control signals
`(VSYNC, HSYNC, DTMG, DOTCLK, etc.), 121 is input
`display data (INdata), 106 is liquid crystal display data
`(OUTdata), 107 is a set of data driver drive signals, CL3 is the
`scan driver clock, FLM-1 and FLM-2 are scan start signals,
`DOFF-1 and DOFF-2 are selection mask control signals, 108
`and 110 are a set of frame memory control signals, and 109
`and 111 are memory circuit display data (FM data).
`[0035] The liquid crystal timing controller 104, which has a
`data conversion circuit 130, receives the supplied display data
`INdata, writes one frame of display data INdata to one or the
`other of the two ports of the memory circuit 105, and, in the
`first half of the interval resulting from dividing one frame into
`two parts (field 1), reads display data from the other port
`where writing is not done, at twice the speed of the writing
`speed.
`[0036] Also, in this embodiment, it is taken that if one frame is
`divided into two parts, then their timewise interval is divided
`into equal parts, but as long as the achievement of the below-
`described operational effect is not
`interfered with,
`the
`configuration may be such that the division is not into equal
`parts, as described in the embodiment referred to below.
`[0037] Among the display data that is read from the memory
`circuit 105, for display data that corresponds to the interval of
`field 1, conversion processing by the data conversion circuit
`130 is done by a preset method. The display data that is data
`conversion processed is supplied to the signal driver (data
`driver) 102 (OUTdata) and is displayed on the liquid crystal
`panel 101. In the interval of the latter half of one frame that is
`divided into two parts (field 2), display data that is read from
`the memory circuit 105 is supplied unchanged to the data
`driver 102 and is displayed on the liquid crystal panel 101.
`[0038] The scan clock CL3, which is a signal of twice the
`speed of the horizontal synchronization signal HSYNC of the
`input, is supplied to the scan drivers 107-1 and 107-2, and for
`the vertical synchronization signals FLM-1 and FLM-2 for
`liquid crystal driving, a signal of 1-field period (1/2 the input
`frame period) is supplied. Furthermore, the data horizontal
`clock CL1, which is a signal of twice the speed of the
`horizontal synchronization signal HSYNC of the input, is
`supplied to the data driver 102. The details of the operation of
`the liquid crystal display device of this embodiment are
`described using the timing charts in FIG. 4 and FIG. 5.
`
`
`which is the time for one period for displaying one screen, is
`divided into N parts (where N is an integer, and this divided
`one interval is taken to be a field); the scan lines are given a
`scan selection signal at N-times speed; the signal lines in M
`fields (where M is an integer and M<N) are given a display
`voltage that corresponds to the corrected liquid crystal display
`data, which is converted according to a preset conversion
`relationship of N times the speed with respect to the input
`display data, and in J fields (where J is an integer and is less
`than or equal to (N-M)) are given a display voltage that
`corresponds to the
`input display data; and display is
`performed in this way.
`[0027] (First Embodiment) Hereafter, the first embodiment
`of the present invention is described, referring to FIG. 1 to
`FIG. 14. In the first embodiment, which is an embodiment that
`is suited to the case in which the response speed of the liquid
`crystal is slower than the 1-field interval, one conventionally
`driven frame is divided into two fields, and driving is done at
`twice the speed.
`[0028] In this embodiment, in which it is assumed that the
`liquid crystal cannot fully respond within one field interval, as
`shown in FIG. 1, in the divided first field (field 1), the given
`gradation data is converted to corrected data, and driving is
`done according to this corrected display data. And in the
`second field (field 2), the driving is done according to the
`given gradation display data, without modifying it.
`[0029] According to the drive method of this embodiment, the
`liquid crystal brightness response can be accelerated,
`because in the first field a response change is carried out up
`to the brightness that corresponds to the display data (the
`target-reaching brightness), while in the second field a display
`is maintained that is of the brightness that corresponds to the
`display data (the target-reaching brightness).
`[0030] Furthermore,
`the
`in
`the
`following description,
`description refers to a liquid crystal panel in normally-black
`display mode. This means that the display-OFF data is black
`data, and the display-ON data is a white display.
`[0031] At the same time, this embodiment can realize
`enlarged display of display data of VGA resolution (640x480
`dots) on a liquid crystal panel with XGA resolution (1024x768
`dots). Having such a resolution conversion function makes it
`possible, in a television system in which mainly moving
`picture display is performed, to use liquid crystal display
`devices of different resolution instead of a CRT display device.
`[0032] FIG. 3 shows an example of the configuration of a
`liquid crystal display device in this embodiment. The liquid
`crystal display device 100 of this embodiment, which is driven
`with display control signals (120 and 121) supplied from a
`display signal source such as a personal computer or a
`television signal receiving device, has a TFT liquid crystal
`panel 101, a data (signal) driver 102 that conveys to the
`signal lines of the TFT liquid crystal panel 101 voltages that
`correspond to the display data, scan drivers 103-1 and 103-2
`that convey to the gate lines of the TFT liquid crystal panel
`101 voltages that correspond to the scan signals, a liquid
`crystal timing controller 104 that converts into drive signals for
`liquid crystal display the display control signals that are
`supplied from the display signal source, and a memory circuit
`105 for display data processing. For the memory circuit 105,
`taking 108 and 109 as port 1 and 110 and 111 as port 2, port
`1 and port 2 are able to perform reading and writing
`independently.
`[0033] Here, the TFT liquid crystal panel 101 has a response
`speed that is slower than the 1-field interval (approximately 8
`ms to 9 ms), the response speed being, for example, from
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`simultaneously, and with the liquid crystal drive circuit 87, a
`liquid crystal drive voltage is produced based on the latch
`data 86 of the latch (2) 85, driving the liquid crystal panel 101.
`[0045] The multi-selection shift register 81, which has a
`configuration such as that shown in FIG. 9, captures a START
`signal with
`the data
`transmission clock CL2, and by
`sequential shifting produces a selection signal 82. The multi-
`selection shift register
`in FIG. 9 has the
`function of
`sequentially carrying out a selection of two simultaneously,
`then a selection one, as shown in FIG. 10. Specifically, as
`shown in FIG. 10, latch selection signals X1 and 2 are
`selected simultaneously, in the next data transmission interval,
`latch selection signal X3 is selected, in the next data
`transmission interval, latch selection signals X4 and 5 are
`selected simultaneously, in the next data transmission interval,
`latch s