WO2012060288A1 - Dispositif d'affichage et son procédé de pilotage - Google Patents

Dispositif d'affichage et son procédé de pilotage Download PDF

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Publication number
WO2012060288A1
WO2012060288A1 PCT/JP2011/074917 JP2011074917W WO2012060288A1 WO 2012060288 A1 WO2012060288 A1 WO 2012060288A1 JP 2011074917 W JP2011074917 W JP 2011074917W WO 2012060288 A1 WO2012060288 A1 WO 2012060288A1
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Prior art keywords
period
signal lines
scanning
backlight
video signal
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PCT/JP2011/074917
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English (en)
Japanese (ja)
Inventor
龍三 結城
誠二 金子
小川　康行
山本　薫
耕平 田中
泰 高丸
有史 八代
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シャープ株式会社
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Publication of WO2012060288A1 publication Critical patent/WO2012060288A1/fr

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0876—Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3614—Control of polarity reversal in general

Definitions

  • the present invention relates to an active matrix display device including a backlight illumination device capable of blinking control and a driving method thereof.
  • a voltage is applied to the video signal line (column electrode) of the liquid crystal panel because the characteristics of a switching element such as a TFT (Thin Film Transistor) provided for each pixel are not sufficient.
  • a switching element such as a TFT (Thin Film Transistor) provided for each pixel are not sufficient.
  • the positive / negative of the video signal output from the video signal line driving circuit also called “column electrode driving circuit” or “data driver circuit”
  • the layer transmittance is not perfectly symmetric with respect to positive and negative data voltages.
  • flicker occurs in the display by the liquid crystal panel (hereinafter referred to as flicker). Is also called “flicker due to positive and negative asymmetry").
  • portable information devices such as mobile phones, in particular, are required to have high-quality display capability due to improved processing performance and advanced use, and thus flicker due to such positive and negative asymmetry becomes a problem.
  • a driving method for alternating current of the liquid crystal module used in the portable information device a driving method (“1”) that reverses the positive / negative polarity of each applied voltage while inverting the positive / negative polarity of the applied voltage for each horizontal scanning line.
  • a driving method (referred to as “one-dot inversion driving method”) in which the positive / negative polarity of the applied voltage is inverted for each pixel adjacent in the vertical and horizontal directions and the positive / negative polarity is inverted for each frame is also adopted. is there.
  • the frequency of polarity inversion in the video signal to be applied to the liquid crystal panel is increased (the inversion frequency is increased), and the withstand voltage required for the driving IC (Integrated Circuit) is increased.
  • the switching frequency of the potential of the common electrode is also increased for reduction.
  • power consumption increases.
  • the one-dot inversion driving method is adopted, the common electrode cannot be inverted and the breakdown voltage required for the driving IC is increased. As a result, the manufacturing cost of the device increases and the power consumption also increases.
  • each pixel formation portion of the liquid crystal panel is sequentially selected for each row and a pixel voltage is applied.
  • the flicker may be visually recognized (hereinafter, this flicker is also referred to as “flicker by data writing”).
  • one end of the capacitor element of the pixel formation portion is caused by potential fluctuation of the scanning signal line and the video signal line connected to the adjacent or adjacent pixel formation portion.
  • the held applied voltage may change via parasitic capacitance formed between the pixel electrode) and these signal lines (this phenomenon is also referred to as “pulling by parasitic capacitance”).
  • the luminance change of the displayed pixel becomes significant according to the applied voltage to be applied next.
  • this luminance change may be visually recognized as flicker (hereinafter, this flicker is also referred to as “flicker by pulling”).
  • Japanese Patent Laid-Open No. 2006-178435 discloses that the backlight device blinks at such a speed that it cannot be detected by the eyes during the scanning period and the scanning stop period, and that the backlight device is turned off during the scanning period.
  • a configuration of a liquid crystal display device in which flicker is reduced by making the length longer is disclosed.
  • this conventional liquid crystal display device is referred to as a first conventional example.
  • Japanese Patent Laid-Open No. 2004-93717 uses an intermittently lit light source that blinks in one frame period consisting of a scanning period and a scanning stop period, and (basically) turns off the light source during the scanning period. Discloses a configuration of a liquid crystal display device that reduces flicker.
  • this conventional liquid crystal display device is referred to as a second conventional example.
  • the present invention provides a display device in which a scanning period and a scanning stop period (holding period) are provided, in which flicker due to current leakage and flicker due to data writing and pulling are both reduced or eliminated. With the goal.
  • a first aspect of the present invention includes a backlight including a light source, a plurality of pixel forming portions that form an image to be displayed by transmitting light from the light source, and a plurality of videos that indicate the image to be displayed
  • a backlight including a light source, a plurality of pixel forming portions that form an image to be displayed by transmitting light from the light source, and a plurality of videos that indicate the image to be displayed
  • a plurality of video signal lines for transmitting signals to the plurality of pixel formation portions; and a plurality of scanning signal lines intersecting the plurality of video signal lines, wherein the plurality of pixel formation portions are the plurality of video signals.
  • An active matrix type display device arranged in a matrix corresponding to intersections of lines and the plurality of scanning signal lines, respectively, Among the frame period longer than 1/60 second consisting of a predetermined scanning period and a holding period started at the end of the scanning period, while selectively driving the plurality of scanning signal lines during the scanning period;
  • a scanning signal line driving circuit for deselecting all the plurality of scanning signal lines;
  • a video signal line driving circuit for supplying the video signal to be transmitted to the plurality of video signal lines during the scanning period;
  • a backlight drive circuit that controls turning on and off of the light source included in the backlight;
  • the backlight drive circuit turns off the light source during a plurality of turn-off periods including a first turn-off period including a start time of the scan period and a second turn-off period including an end time of the scan period. And controlling to turn on the light source during a plurality of lighting periods including a first lighting period provided between the first and second lighting periods.
  • the backlight drive control circuit includes the start time point when approximately half of the first light extinction period has elapsed, and includes the end time point when approximately half of the second light extinction period has elapsed.
  • the light source is controlled.
  • the backlight drive control circuit controls the light source so that lengths of the first turn-off period, the second turn-off period, and the first turn-on period are approximately equal to each other. To do.
  • the backlight drive control circuit controls the light source to alternately repeat the lighting period and the extinguishing period, and sets the sum of the lengths of the lighting period and the subsequent extinguishing period to 1/60 seconds or less.
  • the light source is controlled as described above.
  • a backlight including a light source, a plurality of pixel forming portions for forming an image to be displayed by transmitting light from the light source, and a plurality of videos showing the image to be displayed.
  • a plurality of video signal lines for transmitting signals to the plurality of pixel formation portions; and a plurality of scanning signal lines intersecting the plurality of video signal lines, wherein the plurality of pixel formation portions are the plurality of video signals.
  • An active matrix type display device arranged in a matrix corresponding to intersections of lines and the plurality of scanning signal lines, respectively, During the scanning period of a frame period longer than 1/20 second consisting of a predetermined scanning period and a holding period started at the end of the scanning period, the plurality of scanning signal lines are selectively driven and the holding
  • a scanning signal line driving circuit for deselecting all of the plurality of scanning signal lines during the period;
  • a video signal line driving circuit for supplying the video signal to be transmitted to the plurality of video signal lines during the scanning period;
  • a backlight drive circuit that controls turning on and off of the light source included in the backlight;
  • the backlight drive control circuit controls to turn off the light source during a plurality of turn-off periods including a turn-off period including the scanning period, and to turn on the light source during a predetermined plurality of turn-on periods.
  • a seventh aspect of the present invention is the sixth aspect of the present invention.
  • the plurality of pixel forming portions include: A thin film transistor that is turned on or off in accordance with a signal applied to the connected scanning signal line; A pixel electrode connected to the connected video signal line via the thin film transistor; A common electrode provided in common to the plurality of pixel formation portions; A pixel capacitance formed by the pixel electrode and the common electrode; Each including a liquid crystal element that displays a pixel with a display gradation according to a voltage held in the pixel capacitor,
  • the thin film transistor includes a semiconductor layer made of an oxide semiconductor.
  • the backlight drive control circuit controls the light source to alternately repeat the lighting period and the extinguishing period, and sets the sum of the lengths of the lighting period and the subsequent extinguishing period to 1/60 seconds or less.
  • the light source is controlled as described above.
  • the backlight includes the one or more scanning signal lines so as to transmit light to a plurality of pixel formation portions connected to one scanning signal line group when the plurality of adjacent scanning signal lines are grouped.
  • the backlight drive control circuit controls to turn off a light source group associated with a scanning signal line selected by the scanning signal line drive circuit, and controls to turn on a light source group other than the turned off light source group. It is characterized by doing.
  • the plurality of pixel forming portions include: A thin film transistor that is turned on or off in accordance with a signal applied to the connected scanning signal line; A pixel electrode connected to the connected video signal line via the thin film transistor; A common electrode provided in common to the plurality of pixel formation portions; A pixel capacitance formed by the pixel electrode and the common electrode; Each including a liquid crystal element that displays a pixel with a display gradation according to a voltage held in the pixel capacitor,
  • the thin film transistor includes a semiconductor layer made of an oxide semiconductor.
  • a scanning signal line driving step for bringing all of the plurality of scanning signal lines into a non-selected state;
  • a video signal line driving step for supplying the video signal to be transmitted to the plurality of video signal lines during the scanning period;
  • a backlight driving step for controlling turning on and off of the light source included in the backlight, In the backlight driving step, the light source is turned off during a plurality of turn-off periods including a first turn-off period including a start time of the scan period and a second turn-off period including an end time of the scan period.
  • controlling to turn on the light source during a plurality of lighting periods including a first lighting period provided between the first and second lighting periods
  • a thirteenth aspect of the present invention is a backlight including a light source, a plurality of pixel forming portions for forming an image to be displayed by transmitting light from the light source, and a plurality of videos showing the image to be displayed.
  • a plurality of video signal lines for transmitting signals to the plurality of pixel formation portions; and a plurality of scanning signal lines intersecting the plurality of video signal lines, wherein the plurality of pixel formation portions are the plurality of video signals.
  • a method of controlling an active matrix type display device arranged in a matrix corresponding to intersections of lines and the plurality of scanning signal lines, respectively During the scanning period of a frame period longer than 1/20 second consisting of a predetermined scanning period and a holding period started at the end of the scanning period, the plurality of scanning signal lines are selectively driven and the holding During the period, a scanning signal line driving step for deselecting all the plurality of scanning signal lines; A video signal line driving step for supplying the video signal to be transmitted to the plurality of video signal lines during the scanning period; A backlight driving step for controlling turning on and off of the light source included in the backlight, In the backlight drive control step, the light source is controlled to be turned off during a plurality of turn-off periods including the turn-off period including the scanning period, and the light source is controlled to be turned on during a predetermined plurality of turn-on periods.
  • a fourteenth aspect of the present invention includes a backlight including a plurality of light sources, a plurality of pixel forming portions that form an image to be displayed by transmitting light from the plurality of light sources, and the image to be displayed.
  • the backlight is controlled so that at least the first and second extinguishing periods including the boundary time point between the scanning period and the holding period are extinguished.
  • the backlight is extinguished at the peak portion of the luminance change due to the potential variation due to writing and drawing (holding).
  • the maximum luminance change amount of the backlight can be reduced, so that both flicker caused by current leakage and flicker caused by data writing and pulling can be reduced or eliminated.
  • the backlight is provided in the first half period and the second half period, which are approximately 1 ⁇ 2 period centering on the time when the luminance (change amount) in the vicinity of the peak luminance portion is the largest. Turns off. Therefore, the extinguishing period can be set so as to include as many periods as possible where the luminance (change amount) in the vicinity of the peak luminance is large, and flicker can be greatly suppressed or reduced.
  • the lengths of the first and second turn-off periods and the first turn-on period are substantially equal to each other. As a result, the luminance of the backlight is not insufficient, and the length of the extinguishing period can be maximized.
  • the backlight blinks at a frequency of 60 [Hz] or more that is not perceived as flicker. Can be made.
  • the frame period is longer than 1/20 [second], at least 1/30 [second] or more when the scanning period is set to 1/60 [second].
  • a long holding period is provided. Therefore, power consumption can be sufficiently reduced.
  • the light source is turned off during the turn-off period including the scanning period, flicker due to data writing and pull-in can be reduced or eliminated.
  • the seventh aspect of the present invention since an oxide semiconductor is used for the semiconductor layer of the thin film transistor, current leakage can be made extremely small, and thus power consumption can be sufficiently reduced and flicker can be reduced. Or it can be eliminated.
  • the backlight can be blinked at a frequency of 60 [Hz] or higher that is not perceived as flicker.
  • the frame period is longer than 1/20 [second], it is 1/60 [second] even if the scanning period is long. In this case, a long holding period of at least 1/30 [second] is provided. Therefore, power consumption can be sufficiently reduced.
  • the light source associated with the selected scanning signal line is controlled to be turned off (typically sequentially in accordance with the selection of the scanning signal line), and the light sources other than the turned off light source are turned on. Therefore, flicker caused by data writing and flicker caused by pulling in the pixel formation portion connected to the selected scanning signal line can be reduced or eliminated.
  • only the light source group (grouped) associated with the scanning signal line selected by the scanning signal line driving circuit is controlled to be turned off.
  • the number of light sources to be turned off can be reduced (the illumination can be kept bright), and flicker caused by data writing and flicker caused by pulling in the pixel forming portion connected to the selected scanning signal line can be reduced or eliminated. it can.
  • the oxide semiconductor is used for the semiconductor layer of the thin film transistor, the current leakage can be made very small, and therefore consumption Electric power can be sufficiently reduced, and flicker can be reduced or eliminated.
  • FIG. 1 is a block diagram illustrating an overall configuration of an active matrix liquid crystal display device according to an embodiment of the present invention. It is a circuit diagram which shows the equivalent circuit of the pixel formation part in the said embodiment. It is a figure which shows the detailed structure of a part of display part in the said embodiment. It is a figure which shows the polarity example of each pixel formation part in the said embodiment. It is a figure which shows the timing of the scanning signal and backlight control signal in the said embodiment. It is a figure which shows the relationship between the flicker rate used as a perception limit, and the frequency of blinking.
  • FIG. 1 is a block diagram showing the overall configuration of an active matrix liquid crystal display device according to an embodiment of the present invention.
  • This liquid crystal display device includes a drive control unit including a display control circuit 200, a source driver (video signal line drive circuit) 300, and a gate driver (scanning signal line drive circuit) 400, a display unit 500, and a backlight 600.
  • the display unit 500 includes a plurality (M) of video signal lines SL (1) to SL (M), a plurality (N) of scanning signal lines GL (1) to GL (N), and a plurality of these.
  • a plurality of (M ⁇ N) pixel forming portions provided along the video signal lines SL (1) to SL (M) and the plurality of scanning signal lines GL (1) to GL (N). It is out.
  • the display unit 500 is a TN (Twisted Nematic) orientation method and is configured to be normally white, and a line inversion method is adopted as a driving method.
  • a pseudo dot inversion driving method is adopted in which voltages applied to the liquid crystal portions of adjacent pixel forming portions have opposite polarities. Therefore, in this pseudo dot inversion driving method, the polarity of the voltage of the video signal to be applied to the liquid crystal portion of the pixel forming portion is not inverted for each video signal line unlike the general dot inversion driving method. Details will be described later.
  • FIG. 2 shows an equivalent circuit of the pixel formation portion P (n, m) in the display portion 500 of the present embodiment.
  • all the pixel forming portions P (n, m) in the present embodiment are associated with each other. It is not connected to the scanning signal line GL (n) passing through the intersection but includes one connected to the scanning signal line GL (n + 1).
  • FIG. 3 shows a detailed configuration of a part of the display unit 500 in the embodiment for explaining the connection relation.
  • each pixel forming portion P (n, m) has a gate terminal connected to the scanning signal line GL (n) or the scanning signal line GL (n + 1) adjacent thereto, and
  • the TFT 10 which is a switching element whose source terminal is connected to the video signal line SL (m) passing through the intersection, the pixel electrode Epix connected to the drain terminal of the TFT 10, and the plurality of pixel forming portions P (i, j)
  • the liquid crystal layer is an electro-optical element sandwiched between the common electrode Ecom.
  • the TFT 10 since the TFT 10 is not required to have a high speed response and small current leakage, amorphous silicon that can be manufactured easily and inexpensively is used as the semiconductor layer.
  • amorphous silicon that can be manufactured easily and inexpensively is used as the semiconductor layer.
  • an In—Ga—Zn—O (IGZO) -based oxide, continuous grain boundary silicon, or the like can be used.
  • Each pixel forming portion P (n, m) displays one of red (R), green (G), and blue (B), and has the same color as shown in FIG. Is formed along the video signal lines SL (1) to SL (M) and the direction along the scanning signal lines GL (1) to GL (N). Are arranged in the order of RGB.
  • a liquid crystal capacitance (also referred to as “pixel capacitance”) Clc is formed by the pixel electrode Epix and the common electrode Ecom facing each other with the liquid crystal layer interposed therebetween.
  • Two video signal lines SL (m) and SL (m + 1) are disposed in the vicinity of the pixel electrode Epix.
  • the video signal line SL (m) is connected to the pixel electrode Epix via the TFT 10. It is connected.
  • the video signal line connected to the pixel formation portion P (1, 1) disposed in the upper left corner of the display unit 500 shown in FIG. 3 is the video signal line SL (1), and is adjacent to the right side thereof.
  • the video signal line connected to the pixel forming portion P (1,2) located is the video signal line SL (2).
  • the pixel electrode Epix of the pixel formation portion focused on in this way and the video signal line SL (m + 1) adjacent thereto, and the pixel electrode Epix and two scanning signal lines GL (adjacent thereto) n) and GL (n + 1) each have a parasitic capacitance.
  • the auxiliary capacitance line CsL is formed in parallel with each scanning signal line GL (n), and in each pixel formation portion P (n, m), the pixel electrode Epix and the auxiliary capacitance line CsL A storage capacitor Ccs is formed between the two.
  • the total capacitance formed between the pixel electrode Epix and the other electrode in one pixel formation portion P (n, m) (that is, the total capacitance connected to the pixel electrode Epix) is also referred to as a pixel capacitance.
  • the display control circuit 200 receives a display data signal DAT and a timing control signal TS sent from the outside, and controls a digital image signal DV, a source start pulse signal SSP for controlling the timing of displaying an image on the display unit 500, and a source A clock signal SCK, a latch strobe signal LS, a gate start pulse signal GSP, a gate clock signal GCK, and a backlight control signal BCS for controlling lighting and extinguishing of the backlight 600 are output.
  • the gate driver 400 Based on the gate start pulse signal GSP and the gate clock signal GCK output from the display control circuit 200, the gate driver 400 scans the scanning signal lines GL (1) to GL (N) with an active scanning signal G (1). ... G (N) are sequentially applied.
  • the gate driver 400 applies a predetermined potential to the scanning signal lines GL (1) to GL (N) simultaneously during a holding period (scanning stop period) described later. If this potential is not the active scanning signals G (1) to G (N), that is, if the scanning signal line is in a non-selected state, each scanning signal line GL ( 1) to an inactive scanning signal potential applied to GL (N), or a well-known fixed potential such as a common electrode potential.
  • the source driver 300 applies a predetermined potential (different from or the same as the above-mentioned potential) simultaneously to the video signal lines SL (1) to SL (M) during a holding period to be described later. The operation during these holding periods will be described later.
  • the source driver 300 receives the digital image signal DV, the source start pulse signal SSP, the source clock signal SCK, and the latch strobe signal LS output from the display control circuit 200, and each pixel forming unit P (n, In order to charge the pixel capacity (liquid crystal capacity Clc and auxiliary capacity Ccs) of m), the driving video signals S (1) to S (M) are applied to the video signal lines SL (1) to SL (M). At this time, the source driver 300 sequentially holds the digital image signal DV indicating the voltage to be applied to each of the video signal lines SL (1) to SL (M) at the timing when the pulse of the source clock signal SCK is generated. .
  • the held digital image signal DV is converted to an analog voltage at the timing when the pulse of the latch strobe signal LS is generated.
  • Such D / A conversion is performed by a gradation voltage generation circuit.
  • the gradation voltage generation circuit generates an analog voltage corresponding to each display gradation by, for example, dividing a reference voltage for gradation voltage generation given from the outside of the source driver 300.
  • the analog voltage generated by the gradation voltage generation circuit is applied to all the video signal lines SL (1) to SL (M) as a drive video signal all at once. That is, in the present embodiment, the line sequential driving method is adopted as the driving method of the video signal lines SL (1) to SL (M).
  • the polarities of the drive video signals S (1) to S (M) applied to the video signal lines SL (1) to SL (M) are inverted for each row as described above.
  • the driving video signals S (1) to S (M) when the active scanning signal G (1) is applied to the scanning signal line GL (1) and the active scanning signal G (2) are scanned.
  • the drive video signals S (1) to S (M) when applied to the signal line GL (2) have a reverse polarity.
  • the common electrode potential Vcom applied to the common electrode Ecom is selected from predetermined two potentials by a common electrode driving circuit (not shown) so as to have an opposite phase to the polarity inversion.
  • a signal indicating the timing of the polarity inversion is generated by the display control circuit 200 and is supplied to the common electrode driving circuit and the source driver 300.
  • line inversion driving is realized.
  • the pixel formation portions P (n, m) in the display portion 500 the pixel formation portions P (n, m) in the odd-numbered columns (n is an odd number) have SL (m, ), And the pixel formation portions P (n, m) in even columns (n is an even number) are connected to SL (m) in even rows.
  • the driving video signal is applied to the video signal lines SL (1) to SL (M), and the scanning signal is applied to the scanning signal lines GL (1) to GL (N).
  • the image is displayed on the display unit 500.
  • the auxiliary capacitance line CsL is supplied with a predetermined voltage by a power supply circuit (not shown) and held at a constant potential Cs, but may be driven in the same manner by a circuit similar to the common electrode driving circuit.
  • FIG. 5 is a diagram illustrating the timing of the scanning signal and the backlight control signal in the present embodiment.
  • the gate driver 400 does not sequentially output the active scanning signals G (1) to G (N) over one frame period, but starts from time t1 in one frame period.
  • (active) scanning signals G (1) to G (N) are sequentially output.
  • the source driver 300 outputs the driving video signals S (1) to S (M) in which the polarity is inverted for each row (by the line sequential driving method) as described above. It is.
  • the length of the active period of each of the scanning signals G (1) to G (N) is approximately Ts / N, but is illustrated with a different length in the drawing for easy viewing.
  • the scanning signals G (1) to G (N) and the driving video signals S (1) to S (M) are generated during the holding period Th that is the scanning stop period from time t4 to time t6. ) Are not output, and the scanning signal lines GL (1) to GL (N) and the video signal lines SL (1) to SL (M) are held (fixed) at a predetermined potential.
  • the operation during one frame period is thus completed, the same operation is performed during the next frame period from time t6 to time t7, and the operation is repeated thereafter.
  • the scanning period Ts is 1/60 [second]
  • the holding period Th is 1/30 [second]. Therefore, one frame period is 1/20 [second].
  • these values are merely examples, and other known values may be used.
  • the holding period Th is provided to reduce power consumption, it is usually longer than the scanning period (typically several times as long). It is preferable that the length of one frame is longer than 1/60 [second].
  • the backlight control signal BCS output from the display control circuit 200 is at a low potential from time t1 to time t2, and the backlight 600 is turned off.
  • the time interval from time t1 to time t2 is 1/240 [second].
  • the backlight control signal BCS is at a high potential (active potential), and the backlight 600 is turned on.
  • the backlight lighting period Ton is 1/120 [second].
  • the backlight control signal BCS is at a low potential, and the backlight 600 is turned off.
  • the backlight extinguishing period Toff is 1/120 [second]. Therefore, the backlight blinking period Tbl is 1/60 [second].
  • the backlight repeatedly blinks at a frequency of 60 [Hz].
  • FIG. 6 is a diagram showing the relationship between the flicker rate that is the perceptual limit and the blinking frequency.
  • the solid line shown in FIG. 6 indicates a limit line where flicker can be perceived.
  • the upper side of the solid line is an area where flicker can be perceived, and the lower side is an area where flicker cannot be perceived. Referring to FIG. 6, it can be seen that flicker is most easily perceived near a frequency of 10 [Hz], and is not perceived as flicker at frequencies of 60 [Hz] or higher.
  • the backlight even if the backlight repeatedly blinks at a frequency of 60 [Hz], it may be perceived as flicker if the change in lighting luminance has a periodicity. That is, if the average luminance (or peak luminance) of the display panel at the time of backlight lighting is not constant, it may be perceived as flicker depending on the luminance change period.
  • Ton the average brightness of the display panel in a certain backlight lighting period Ton
  • Ton the average brightness of the display panel in the next backlight lighting period Ton
  • Ton the next (that is, the next skipped) backlight.
  • A be the average luminance of the display panel during the light lighting period Ton.
  • the average luminance of the display panel when the backlight is lit changes periodically at 30 [Hz]. This luminance change may be perceived as 30 [Hz] flicker.
  • the average brightness of the display panel when the backlight is lit is changed for each frame (A ⁇ B ⁇ A ⁇ B ⁇ %), The average brightness of the display panel is periodically 10 [Hz] in two frame periods. Will change. This luminance change may be perceived as 10 [Hz] flicker.
  • the flicker rate that is a perceptual limit is referred to as “limit flicker rate”. If the maximum luminance change amount is suppressed so as to be as follows, flicker can be prevented from being perceived regardless of the blinking frequency. Further, even if the flicker rate is equal to or higher than the limit flicker rate, the flicker rate can be reduced as the maximum amount of change in luminance is suppressed. Therefore, flicker can be made difficult to be perceived, and as a result, flicker can be reduced.
  • the backlight in order to suppress the maximum luminance change amount, as shown in FIG. 5, at a time point between the scanning period Ts and the holding period Th (for example, time t1, t4, t6, etc.), the backlight.
  • a backlight extinction period Toff is arranged so that 600 is extinguished.
  • the maximum luminance change amount is suppressed by such a backlight blinking operation.
  • FIG. 7 is a diagram showing a temporal change in luminance observed at the center of the display unit when the backlight is fixed in a lit state.
  • the backlight 600 is fixed to a state in which the backlight 600 is lit with the brightness at the time of white solid display.
  • the brightness at the time of this white solid display is 100 [cd / m 2 ].
  • a black gradation (255 gradation) and intermediate gradation (126 gradation) display area is arranged in a checkered pattern for each pixel. And are displayed alternately. By using such a display pattern, the influence of positive and negative asymmetric flicker can be eliminated.
  • the horizontal axis in FIG. 7 indicates the elapsed time
  • the vertical axis indicates the normalized luminance value.
  • a scanning period Ts of a certain frame is started when 0.5 seconds have elapsed from the measurement start time (time 0 seconds). After this scanning period Ts ends, that is, 1/60 [second], the holding period Th starts. After the holding period Th ends, that is, after 1/30 [second], the operation of starting the scanning period Ts of the next frame is repeated. Observing the change in display luminance caused by such an operation, it can be seen that a peak in luminance change occurs between the scanning period Ts and the holding period Th. It can also be seen that the maximum luminance occurs at the time of switching from the holding period Th to the scanning period Ts, and further occurs every two frames.
  • Such a luminance change occurs according to the current leak as described above or the potential fluctuation of the pixel electrode due to data writing and pulling.
  • the amount of current leak occurring in the pixel formation portion ends from the start of the holding period. Grows toward the time.
  • the polarity of the video signal is applied to the video signal line with being inverted (from the previous frame), and a luminance change occurs in accordance with potential fluctuation caused by data writing or drawing.
  • a luminance change peak occurs at the boundary point between the holding period Th and the scanning period Ts.
  • the amount of change in luminance is the difference between the potential of the video signal line and the scanning signal line during the holding period, the effective voltage of the pixel electrode due to the data writing and pulling in, the effective voltage difference between adjacent two frame periods due to polarity inversion driving, etc.
  • the luminance is maximum between the start time of the scanning period Ts in the first frame period and the start time of the scanning period Ts in the (next next) frame period skipping one frame period. .
  • such a periodic luminance change (especially in the peak luminance portion) may be recognized as flicker.
  • the backlight extinguishing period Toff is set so as to include a time point between the scanning period Ts in which the peak luminance portion is generated and the holding period Th.
  • times t1, t4, t6, etc. which are the time points between the scanning period Ts and the holding period Th, are included in the backlight extinguishing period Toff, and more specifically, The time point when 1/2 of the backlight extinguishing period Toff has elapsed and the time point between the scanning period Ts and the holding period Th are set to coincide with each other.
  • the backlight is turned off in the vicinity of the peak luminance portion, as shown in FIG. 8, the change in luminance is suppressed as a whole, and as a result, flicker is suppressed.
  • FIG. 8 is a diagram showing a temporal change in luminance observed in the central part of the display unit in the present embodiment.
  • the luminance in the backlight lighting period Ton shown in FIG. 5 is the same as the luminance shown in FIG. 7, but the luminance in the backlight extinguishing period Toff shown in FIG. Unlike the luminance shown in FIG. Therefore, since the backlight is turned off in the vicinity of the peak luminance portion, the maximum luminance change amount (and flicker rate) is suppressed. The fact that flicker is actually suppressed by this will be described with reference to FIG.
  • FIG. 9 is a diagram showing the waveforms shown in FIGS. 7 and 8 in a power spectrum.
  • the horizontal axis in FIG. 9 is the frequency of the luminance waveform, and the vertical axis is the power spectrum normalized at a frequency of 0 [Hz].
  • the alternate long and short dash line in the figure indicates a limit line where flicker can be perceived, and the upper side (inside) of the alternate long and short dash line is an area where flicker can be perceived.
  • the luminance waveform in the present embodiment shown in FIG. 8 is shown by a solid line
  • the luminance waveform in the case where the configuration of the present embodiment shown in FIG. 7 is not applied is shown by a dotted line.
  • the component of the frequency 10 [Hz] is 1/10 [seconds] in the interval between two luminance peak portions, that is, the maximum luminance, that is, the length of two frame periods, with reference to the waveforms shown in FIGS. ], It can be seen that this is the frequency component of the luminance change with this as one period. By repeating this change, it is perceived as 10 [Hz] flicker.
  • flicker can be eliminated or reduced by setting the backlight extinguishing period Toff so as to include the time point between the scanning period Ts and the holding period Th in which the peak luminance portion occurs.
  • the backlight extinction period Toff is large (most effective) by providing not only the time when the luminance (change amount) in the vicinity of the peak luminance portion becomes the largest, but also including as many periods as possible in the vicinity of the luminance. Flicker can be suppressed or reduced. Therefore, it is preferable to set as in the present embodiment.
  • the backlight turn-off period Toff is longer than the backlight turn-on period Ton, the overall backlight brightness may be insufficient.
  • the backlight is not periodically blinked by setting the backlight extinction period Toff to be long, a luminance change of a frequency component smaller than 60 [Hz] may occur. For this reason, it is preferable to blink the backlight at a frequency of 60 [Hz] or higher.
  • the lengths of the light extinguishing period Toff and the backlight lighting period Ton are preferably equal, and each length is preferably 1/120 [second] or less.
  • the above-described luminance change has been described on the assumption that the optical response of the liquid crystal can be almost ignored, when a liquid crystal element capable of high-speed response such as a ferroelectric liquid crystal or an anti-ferroelectric liquid crystal is not used, the actual change is not observed.
  • the luminance change is delayed from the above luminance change according to the optical response time of the liquid crystal element. Therefore, it is preferable to appropriately determine the backlight turn-off period Toff (and the backlight turn-on period Ton) according to the actual luminance change.
  • the backlight is turned off at the peak portion of the luminance change due to the current leakage or the potential variation of the pixel electrode due to the data writing and pulling in.
  • the backlight extinction period Toff is set so as to include the time point.
  • the TFT 10 uses an In—Ga—Zn—O (IGZO) -based oxide semiconductor as a semiconductor layer.
  • IGZO In—Ga—Zn—O
  • the holding period is set to be very long (here, 25 times) compared to the scanning period. Therefore, the backlight control operation in the present embodiment is also different from the operation in the first embodiment.
  • the control operation of the backlight 600 performed by the display control circuit 200 in the present embodiment will be described with reference to FIG.
  • a holding period that is several times longer than that in the first embodiment typically 1/6 [ It is preferable that a long holding period of at least [second] is provided because no problem occurs. By providing such a long holding period, power consumption can be greatly reduced.
  • a holding period longer than the length of the holding period of the first embodiment that is, 1/30 [second]
  • the scanning period is usually 1/60 [second] or less
  • the backlight control signal BCS output from the display control circuit 200 is at a low potential from time t21 to time t22, and the backlight 600 is turned off.
  • the scanning period Ts is the backlight extinguishing period Toff, which is different from the case of the first embodiment shown in FIG.
  • the backlight is turned off in this embodiment because current leakage hardly occurs during the holding period Th, and therefore flicker due to current leakage hardly occurs. Therefore, flicker due to data writing and pull-in, particularly flicker due to pull-in, is prevented. This is to reduce or eliminate. Therefore, if the entire scanning period Ts is set to the backlight extinguishing period Toff, flicker can be reliably reduced or eliminated as a whole.
  • the backlight control signal BCS is at a high potential (active potential), and the backlight 600 is turned on.
  • This backlight extinction period Ton is 1/120 [second]. Therefore, the backlight blinking period Tbl is 1/60 [seconds] as in the first embodiment. In this way, the backlight is blinked at a frequency of 60 [Hz], so that it is not perceived as flicker.
  • FIG. 11 is a diagram showing a temporal change in luminance observed at the center of the display unit when the backlight is fixed in a lit state.
  • the backlight 600 is fixed in a state of being lit at the brightness at the time of white solid display.
  • the luminance condition and display pattern at this time are the same as those in the first embodiment.
  • the horizontal axis in FIG. 11 indicates the elapsed time
  • the vertical axis indicates the normalized luminance value.
  • the backlight extinction period Toff is set over the entire scanning period Ts including the peak luminance portion.
  • the scanning period Ts from time t21 to time t22 and the scanning period Ts from time t24 to time t25 are the backlight extinction period Toff, and the length of the scanning period Ts is long.
  • a backlight turn-off period Toff equal to the above is set. As a result, the backlight is turned off during the scanning period Ts including the peak luminance portion, so that the change in luminance is suppressed as a whole as shown in FIG. 12, and as a result, flicker is suppressed.
  • the maximum luminance change amount is (L1-L2). It becomes. This amount is less than half that in FIG. This can reduce flicker or prevent it from being perceived.
  • the TFT 10 uses an In—Ga—Zn—O (IGZO) -based oxide semiconductor as a semiconductor layer.
  • the holding period is set to be very long (25 times here) compared to the scanning period. Even when such a long holding period is provided, the TFT 10 using an oxide semiconductor has a very small amount of current leakage and thus is preferable because no problem occurs. This is the same as in the second embodiment.
  • the length of the frame period is preferably at least longer than 1/20 [second] in order to greatly reduce power consumption.
  • the present embodiment has a structure in which the lighting location of the backlight can be selected for each display row (here, N / 10 rows as one unit).
  • FIG. 13 is a diagram simply showing the structure of the backlight in this embodiment.
  • the backlight 600 includes ten LED units 601a to 610a arranged on the left side with respect to the display surface of the display unit 500, and ten LED units 601b to 610b arranged on the right side.
  • the light guide plate 650 radiates light from the LED unit toward the display surface, and a light coupling material and optical sheets (not shown).
  • Each LED unit is provided with an optical lens, and emits light in a direction perpendicular to the arrangement direction and parallel to the long side of the light guide plate 650. Further, the left side 601a to 610a and the right side LED unit 601b to 610b are provided at positions facing each other, and the facing LEDs are controlled to blink simultaneously.
  • the display control circuit 200 activates a backlight control signal BCS1 (not shown) to turn on the LED units 601a and 601b, and similarly causes each LED unit to blink according to the corresponding backlight control signals BCS2 to BCS10. Control.
  • FIG. 13 shows a state where the LED units 603a and 603b are turned off (as indicated by hatching) and the remaining LED units are turned on.
  • BCS1 backlight control signal
  • FIG. 14 is a diagram illustrating the timing of the scanning signal and the backlight control signal in the present embodiment. As can be seen from comparison with FIG. 10, the scanning signal shown in FIG. 14 is the same as that of the second embodiment, but the control mode of the backlight is different.
  • the backlight control signal BCS1 output from the display control circuit 200 is at a low potential for the backlight extinguishing period Toff from time t21, and the LED units 601a and 601b provided in the backlight 600 only during this period. Is turned off. As a result, the backlight portions corresponding to the first to N / 10th lines of the display unit are turned off. In this way, since the backlight control signals BCS1 to BCS10 are sequentially activated during the scanning period Ts, portions corresponding to N / 10 rows of the backlight are sequentially turned off. The scan is turned off from top to bottom. Such an operation is similarly repeated in the next scanning period Ts from time t24 to time t25. Further, since the backlight control signals BCS1 to BCS10 are always active during the holding period Th, all the backlights are turned on.
  • the scanning may be turned off as in the scanning period Ts. Then, the average luminance of the backlight during the holding period Th can be made equal to that during the scanning period Ts. Further, the backlight may be blinked during the holding period Th at a frequency that is not recognized as flicker.
  • the length of the active period of each of the scanning signals G (1) to G (N) is described so as to be different from the actual one.
  • the length of the active period of each of the backlight control signals BCS1 to BCS10 is also described so as to be different from the actual period, and the actual length is 10 times the active period of each scanning signal, that is, approximately 10 Ts / N.
  • the LED units other than the LED unit associated with the selected scanning signal line are turned on, but one of them (typically, associated with the selected scanning signal line).
  • the LED unit adjacent to the LED unit may be turned off.
  • the illumination (average) luminance by the backlight is lower than in the case of the present embodiment, but the pixel forming unit connected to the scanning signal line selected from the adjacent LED unit is not used. Since the transmitted light is not given, flicker can be further reduced.
  • the backlight 600 is a plurality of light sources capable of transmitting light to the pixel forming portion connected to the selected scanning signal line, and includes a plurality of light sources associated with the grouped scanning signal line groups. It only has to be provided. Therefore, for example, so-called area active control may be performed in which backlight units are arranged in a matrix for each predetermined display area. In this case, at least a plurality of backlight units in the same row are controlled to blink simultaneously as the same group.
  • a configuration may be adopted in which all of them are associated with each other. For example, only the unit closest to the pixel forming portion may be associated. In this case, even if the LED unit associated with the selected scanning signal line is turned off, light from other LED units may be transmitted to the pixel formation portion connected to the scanning signal line, but flickering is not possible. As long as it does not cause a change in brightness to the extent that it is visually recognized as a
  • the actual luminance change has been described on the assumption that the optical response of the liquid crystal can be almost ignored, the actual luminance change depends on the optical response time of the liquid crystal element as in the case of the second embodiment. It may be later than the case. In that case, the lighting and extinguishing periods of the LED units controlled by the backlight control signals BCS1 to BCS10 are appropriately set according to actual luminance changes (for example, a range to be delayed or turned off). Preferably).
  • an oxide semiconductor is used for the TFT 10 so that flicker due to current leakage does not occur even when a long holding period is provided.
  • a configuration in which a semiconductor is used or another known configuration in which flicker due to current leakage is prevented may be employed. By doing so, it is possible to reduce or eliminate both the flicker caused by current leakage and the flicker caused by data writing and drawing.
  • the active matrix type liquid crystal display device is described as an example.
  • the display device is an active matrix type voltage controlled display device that includes a backlight illumination device and includes a scanning period and a holding period. If it is a display device, the present invention can be applied to other than the liquid crystal display device.
  • the present invention relates to a display device including a backlight illumination device capable of blinking control, and is particularly suitable for an active matrix liquid crystal display device including the backlight illumination device.

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  • Crystallography & Structural Chemistry (AREA)
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Abstract

Un dispositif d'affichage selon la présente invention est conçu de telle sorte qu'une période de désactivation de rétroéclairage (Toff) est incluse à des instants, tels que des instants (t1, t4, t6), qui se trouvent chacun entre une période de balayage (Ts), dans laquelle des signaux de balayage actifs (G(1)-G(N)) sont séquentiellement délivrés par un circuit d'attaque de grille (400), et une période de rétention (Th), dans laquelle la sortie est arrêtée. Par conséquent, étant donné qu'un rétroéclairage (600) est désactivé à un instant proche d'une crête en laquelle la quantité de variation de luminance du rétroéclairage devient la plus grande, une variation de luminance est supprimée dans l'ensemble, et en conséquence, un papillotement est supprimé.
PCT/JP2011/074917 2010-11-04 2011-10-28 Dispositif d'affichage et son procédé de pilotage WO2012060288A1 (fr)

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WO2014034235A1 (fr) * 2012-08-30 2014-03-06 シャープ株式会社 Dispositif d'affichage à cristaux liquides et son procédé de pilotage
TWI677865B (zh) * 2018-06-14 2019-11-21 友達光電股份有限公司 閘極驅動裝置
WO2020056872A1 (fr) * 2018-09-21 2020-03-26 深圳创维－Rgb电子有限公司 Système de commande de gradation et procédé de commande de gradation pour source de rétroéclairage, et dispositif d'affichage

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JP2008065228A (ja) * 2006-09-11 2008-03-21 Sharp Corp 発光装置および液晶表示装置
JP2009075390A (ja) * 2007-09-21 2009-04-09 Seiko Epson Corp 電気光学装置及びその駆動方法、並びに電子機器
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WO2014034235A1 (fr) * 2012-08-30 2014-03-06 シャープ株式会社 Dispositif d'affichage à cristaux liquides et son procédé de pilotage
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TWI677865B (zh) * 2018-06-14 2019-11-21 友達光電股份有限公司 閘極驅動裝置
WO2020056872A1 (fr) * 2018-09-21 2020-03-26 深圳创维－Rgb电子有限公司 Système de commande de gradation et procédé de commande de gradation pour source de rétroéclairage, et dispositif d'affichage

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