WO2016208321A1 - 制御回路、表示装置、電子機器および投射型表示装置 - Google Patents
制御回路、表示装置、電子機器および投射型表示装置 Download PDFInfo
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- WO2016208321A1 WO2016208321A1 PCT/JP2016/065609 JP2016065609W WO2016208321A1 WO 2016208321 A1 WO2016208321 A1 WO 2016208321A1 JP 2016065609 W JP2016065609 W JP 2016065609W WO 2016208321 A1 WO2016208321 A1 WO 2016208321A1
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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
- G09G3/3674—Details of drivers for scan electrodes
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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
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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
- G09G3/3614—Control of polarity reversal in general
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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
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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
- G09G3/3655—Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
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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
- G09G3/3685—Details of drivers for data electrodes
- G09G3/3688—Details of drivers for data electrodes suitable for active matrices only
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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
- G09G3/3696—Generation of voltages supplied to electrode drivers
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/133397—Constructional arrangements; Manufacturing methods for suppressing after-image or image-sticking
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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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
- G09G2310/0297—Special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a pre-processing circuitry delivering display data to said drivers or in the matrix panel, e.g. multiplexing plural data signals to one D/A converter or demultiplexing the D/A converter output to multiple columns
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0209—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
- G09G2320/0214—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display with crosstalk due to leakage current of pixel switch in active matrix panels
Definitions
- the present disclosure relates to a control circuit, a display device, an electronic device, and a projection display device.
- an AC driving method is employed in which the polarity of the signal voltage applied to the pixel electrode of the liquid crystal cell with respect to the potential of the counter electrode of the liquid crystal cell is inverted at a predetermined cycle.
- the common voltage applied to the counter electrode is made constant and the polarity of the signal voltage is inverted every field period, or not only the signal voltage but also the common voltage is inverted every field period.
- a field inversion driving method is known (for example, see Patent Document 1).
- the potential difference between the source and the drain of the pixel transistor increases in a specific period within one field period, and a leak current flows through the pixel transistor.
- the period during which a large amount of leakage current flows (hereinafter referred to as “leak period”) differs within one screen.
- the leak periods are different between the upper part of the screen, the central part of the screen, and the lower part of the screen.
- the characteristics of the pixel transistor vary from pixel to pixel. For this reason, since the amount of leak differs not only in the vertical direction of the screen but also for each pixel, there is a problem that shading occurs from the center of the screen to the lower side, mottled patterns occur, and image quality deteriorates.
- control circuit that can significantly suppress deterioration in image quality due to current leakage in field inversion driving, as well as a display device, an electronic apparatus, and a projection display device including the control circuit.
- a control circuit is a control circuit that controls driving of an electro-optical element.
- the control circuit When the signal waveform output from the control circuit is observed with a display resolution of 200 ⁇ sec or a display resolution lower than 200 ⁇ sec, the control circuit has a vertical effective display period of one field defined by the vertical start signal.
- the active matrix drive is controlled by the field inversion drive method so that it is closer to the start of the period.
- a display device includes an electro-optical element and a control circuit that controls driving of the electro-optical element.
- the control circuit When the signal waveform output from the control circuit is observed with a display resolution of 200 ⁇ sec or a display resolution lower than 200 ⁇ sec, the control circuit has a vertical effective display period of one field defined by the vertical start signal.
- the active matrix drive is controlled by the field inversion drive method so that it is closer to the start of the period.
- An electronic apparatus includes a display device.
- the display device includes an electro-optical element and a control circuit that controls driving of the electro-optical element.
- the control circuit When the signal waveform output from the control circuit is observed with a display resolution of 200 ⁇ sec or a display resolution lower than 200 ⁇ sec, the control circuit has a vertical effective display period of one field defined by the vertical start signal.
- the active matrix drive is controlled by the field inversion drive method so that it is closer to the start of the period.
- a projection display device includes an illumination optical system, a plurality of electro-optical elements that generate image light by modulating light from the illumination optical system, and driving of the plurality of electro-optical elements.
- a control circuit for controlling and a projection optical system for projecting image light generated by a plurality of electro-optical elements are provided.
- the control circuit When the signal waveform output from the control circuit is observed with a display resolution of 200 ⁇ sec or a display resolution lower than 200 ⁇ sec, the control circuit has a vertical effective display period of one field defined by the vertical start signal.
- the active matrix drive is controlled by the field inversion drive method so that it is closer to the start of the period.
- the active matrix drive is controlled by the field inversion drive method so that the vertical effective display period is closer to the start of one field period.
- the in-plane distribution of the leak amount in one field period becomes more uniform as compared with the case where the active matrix drive control is performed by the conventional field inversion drive method.
- the in-plane distribution of the leak amount in one field period is made more uniform. Alleviated.
- in field inversion driving it is possible to suppress deterioration in image quality due to current leakage.
- the effect of this technique is not necessarily limited to the effect described here, Any effect described in this specification may be sufficient.
- FIG. 19B is an enlarged view of the waveform diagram of FIG. 19A. It is a wave form chart for explaining an example of an effective display period and a blanking period.
- FIG. 20B is an enlarged view of the waveform diagram of FIG. 20A. It is a schematic diagram for demonstrating an example of an effective display period and a blanking period. It is a schematic diagram for demonstrating an example of an effective display period and a blanking period.
- FIG. 36 is a diagram illustrating an example of a schematic configuration of a display panel module in the display device of FIG. It is a figure showing an example of the circuit structure of a horizontal drive circuit and a precharge circuit. It is a figure showing an example of the circuit structure of a horizontal drive circuit and a precharge circuit.
- FIG. 1 illustrates an example of a schematic configuration of the display device 1 according to the first embodiment of the present disclosure.
- the display device 1 can be applied as a light valve of a three-plate projector (projection display device).
- the display device 1 includes, for example, a pixel array unit 10, a controller 20, and a liquid crystal driver 30.
- the pixel array unit 10 may be a transmissive type or a reflective type. When the pixel array unit 10 is a transmissive type, the display device 1 may include a light source (not shown) behind the pixel array unit 10 as necessary.
- the display device 1 corresponds to a specific example of “display device” of the present disclosure.
- the controller 20 corresponds to a specific example of a “control circuit” of the present disclosure.
- the pixel array unit 10 has, for example, normally black transmittance characteristics or reflectance characteristics.
- normally black refers to an optical characteristic in which the transmittance or reflectance is minimized when no voltage is applied, and a black display is obtained.
- the pixel array unit 10 may have, for example, normally white transmittance characteristics or reflectance characteristics.
- normally white refers to an optical characteristic in which the transmittance or reflectance is maximized when no voltage is applied, and white display is performed.
- the pixel array unit 10 generates image light by electrically changing the polarization state of light by applying a voltage.
- FIG. 2 shows an example of a schematic configuration of the display panel module 40.
- the display device 1 includes a display panel module 40.
- the display panel module 40 includes a display panel 41 in which the pixel array unit 10 and the liquid crystal driver 30 are provided on a substrate made of, for example, a glass plate or a resin plate.
- the display panel module 40 further includes, for example, an FPC (Flexible Printed Circuits) 42 connected to the liquid crystal driver 30 on the display panel 41 and a control board 43 connected to the FPC 42.
- the control board 43 controls the pixel array unit 10 via the liquid crystal driver 30 and includes, for example, a controller 20.
- the controller 20 is composed of, for example, an IC.
- the controller 20 may be provided on the FPC 42 or may be provided on the substrate of the display panel module 40.
- the pixel array unit 10 includes a plurality of scanning lines WS extending in the row direction, a plurality of signal lines Sig extending in the column direction, and one for each portion where the scanning lines WS and the signal lines Sig intersect each other. And a plurality of pixels 11 provided. Each pixel 11 is connected in parallel to a liquid crystal cell CL, a pixel transistor Tr that samples the voltage of the signal line Sig based on a signal input from the scanning line WS and writes to the liquid crystal cell CL, and the liquid crystal cell CL, for example. And a capacitive element Cs.
- the pixel transistor Tr is composed of, for example, a thin film transistor (TFT: “Thin” Film “Transistor”).
- the liquid crystal cell CL includes, for example, a liquid crystal layer and a pixel electrode and a counter electrode that sandwich the liquid crystal layer.
- the liquid crystal cell CL may further include, for example, a polarizing plate.
- the pixel electrode is connected to the source or drain of the pixel transistor Tr, and the counter electrode is connected to a VCOM circuit 24 described later.
- the display state of the liquid crystal cell CL is, for example, TN (TwistedistNematic) mode, VA (Vertical Alignment) mode, IPS (In Plane Switching) mode, FFS (Fringe Field Switching) mode, STN (Super Twisted Nematic) mode, or ECB (Electrically Controlled Birefringence) mode.
- TN TransmissionistNematic
- VA Vertical Alignment
- IPS In Plane Switching
- FFS Feringe Field Switching
- STN Super Twisted Nematic
- ECB Electrically Controlled Birefringence
- the liquid crystal driver 30 causes the pixel array unit 10 to generate image light based on a video signal input from the outside by active matrix driving each pixel 11.
- the liquid crystal driver 30 includes a vertical drive circuit 31 connected to a plurality of scanning lines WS and a horizontal drive circuit 32 connected to a plurality of signal lines.
- FIG. 3 shows an example of the circuit configuration of the horizontal drive circuit 32.
- FIG. 4 is a waveform diagram for explaining an example of dot sequential driving by the controller 20.
- the horizontal drive circuit 32 is not limited to the configuration shown in FIG.
- the horizontal drive circuit 32 operates based on a control signal supplied from the controller 20 and outputs the signal voltage Vsig in parallel to the pixel array unit 10 via each signal line Sig one line at a time.
- the signal voltage Vsig has a peak value or a pulse width corresponding to the gradation of a video signal DA (described later) input from the outside.
- the vertical drive circuit 31 operates based on a control signal supplied from the controller 20, and outputs a drive pulse for scanning each pixel 11 line-sequentially to the pixel array unit 10 via each scan line WS.
- the horizontal drive circuit 32 includes, for example, a plurality of shift registers SR (SR (a1), SR (a2)... SR (a41)) assigned to each group of signal lines Sig, and signal lines Sig.
- Each of the groups includes a plurality of switch elements SWa to which one switch is assigned for each signal line Sig.
- the output terminal is connected to the ON / OFF control terminal of each switch element SWa in the corresponding group, and the input terminal is connected via the FPC 42.
- the controller 20 Connected to the controller 20.
- In each switch element SWa one end is connected to each signal line Sig one by one, and the other end is connected to the controller 20 via the FPC 42.
- the horizontal drive circuit 32 sequentially outputs the control signal SR from each shift register SR to the on / off control terminal of each switch element SWa in the corresponding group.
- the signal voltage Vsig is sequentially output from each group to each corresponding signal line Sig.
- the controller 20 controls the liquid crystal driver 30 for active matrix driving of each pixel 11 by the field inversion driving method.
- the field inversion driving method will be described in detail later.
- the controller 20 includes a signal processing circuit 31, a timing generation circuit 32, an inversion circuit 33, a VCOM circuit 34, and a power supply generation circuit 25.
- the signal processing circuit 31 converts, for example, an externally input digital video signal Din into an analog video signal DA for the pixel array unit 10, and outputs the converted video signal DA to the inverting circuit 33.
- the signal processing circuit 31 further separates the synchronization signal Ts from the video signal Din, and outputs the separated synchronization signal Ts to the timing generation circuit 32.
- the timing generation circuit 32 generates, for example, a horizontal start signal HST and a horizontal clock signal HCK that are synchronized with the synchronization signal Ts and outputs the horizontal start signal HST to the horizontal drive circuit 32.
- the timing generation circuit 32 further forms, for example, a vertical start signal VST and a vertical clock signal VCK synchronized with the synchronization signal Ts, and outputs them to the vertical drive circuit 31.
- the timing generation circuit 32 further forms, for example, an inversion control pulse synchronized with the synchronization signal Ts and outputs it to the inversion circuit 33.
- the timing generation circuit 32 further forms, for example, a vertical clock signal VCK synchronized with the synchronization signal Ts and outputs it to the VCOM circuit 34.
- the inversion circuit 33 performs a polarity inversion operation according to the inversion control pulse.
- the inverting circuit 33 forms a signal voltage Vsig whose polarity is inverted every field period from the video signal DA.
- the inverting circuit 33 outputs the formed signal voltage Vsig to the horizontal drive circuit 32.
- the power generation circuit 25 generates a voltage necessary for the signal processing circuit 21 and the VCOM circuit 24 and supplies the voltage to the signal processing circuit 21 and the VCOM circuit 24.
- one field period is a period defined by the vertical start signal VST, for example, as shown in FIG.
- the start of one field period corresponds to the rise of the vertical start signal VST
- the end of one field period corresponds to the rise of the vertical start signal VST generated first after the start of one field period.
- one field period may be a period defined by the pulse waveform of the common voltage Vcom.
- one field period corresponds to a period from the rising time to the falling time of the common voltage Vcom, or a period from the falling time to the rising time of the common voltage Vcom.
- One field period includes an effective display period Ta in which the signal voltage Vsig is applied to the pixel array unit 10, and a blanking period Tb provided at least one before and after the effective display period Ta. .
- an effective display period Ta in which the signal voltage Vsig is applied to the pixel array unit 10
- a blanking period Tb provided at least one before and after the effective display period Ta.
- the signal voltage Vsig for all lines is sequentially output from the horizontal drive circuit 32 to each signal line Sig in synchronization with the vertical clock signal VCK for each signal voltage Vsig for one line. Is done.
- the blanking period Tb is a period in which no image is displayed on the pixel array unit 10, and is a period in which various signal processes are performed.
- the horizontal start signal HST defines, for example, one horizontal period (1H) as shown in FIG.
- the start of one horizontal period (1H) corresponds to the rise of the horizontal start signal HST, and the end of one horizontal period corresponds to the rise of the horizontal start signal HST generated first after the start of one horizontal period.
- Each horizontal period in the effective display period Ta includes an effective display period Tc in which the signal voltage Vsig is applied to the pixel array unit 10, and a blanking period Td provided at least before or after the effective display period Tc. It is comprised including.
- the signal voltage Vsig for one line is output simultaneously from the horizontal drive circuit 32 to each signal line Sig in synchronization with the horizontal clock signal HCK, or sequentially for each group of signal lines Sig. Or output.
- the blanking period Td is a period during which no image is displayed on the pixel array unit 10.
- the VCOM circuit 34 generates a predetermined common voltage Vcom and applies it to the counter electrode of the liquid crystal cell CL. For example, when performing DC driving, the VCOM circuit 34 keeps the common voltage Vcom constant and applies it to the counter electrode of the liquid crystal cell CL. For example, when performing AC driving, the VCOM circuit 34 applies a common voltage Vcom, which changes in pulse in synchronization with the vertical start signal VST, to the counter electrode of the liquid crystal cell CL. At this time, the VCOM circuit 34 forms a common voltage Vcom whose polarity is inverted for each field, and applies the formed common voltage Vcom to the counter electrode of the liquid crystal cell CL.
- FIG. 7 shows another example of the circuit configuration of the horizontal drive circuit 32.
- FIG. 8 is a waveform diagram for explaining an example of line-sequential driving by the controller 20.
- the horizontal drive circuit 32 is not limited to the configuration shown in FIG.
- the horizontal drive circuit 32 includes, for example, a plurality of selection lines SEL (SEL (1), SEL (2)... SEL (41)) assigned to each group of signal lines Sig, and signal lines Sig.
- Each group includes a plurality of switch elements SWb assigned to each signal line Sig.
- SEL selection lines
- Each group includes a plurality of switch elements SWb assigned to each signal line Sig.
- the horizontal drive circuit 32 is configured so that the switch SWb is sequentially turned on for each group of signal lines Sig based on a control signal supplied from the controller 20, thereby causing the signal voltage for each group of signal lines Sig. Vsig is output sequentially.
- FIG. 9 is a schematic diagram for explaining an example of field inversion driving according to the present embodiment.
- the field inversion driving refers to driving in which a signal voltage Vsig having a polarity inverted with respect to the common voltage Vcom of the liquid crystal cell CL is applied to the liquid crystal cell CL every field period (1F).
- “+” indicates that the polarity of the signal voltage Vsig is positive with respect to the common voltage Vcom.
- ⁇ indicates that the polarity of the signal voltage Vsig is negative with respect to the common voltage Vcom.
- “+” and “ ⁇ ” represent the relative magnitude relationship between the signal voltage Vsig and the common voltage Vcom.
- the polarity of the signal voltage Vsig with respect to the common voltage Vcom is positive over the entire screen.
- time t2 the polarity of the signal voltage Vsig with respect to the common voltage Vcom is shifted from positive to negative in the uppermost line in one screen.
- the polarity of the signal voltage Vsig with respect to the common voltage Vcom is shifted from positive to negative in the second and third lines from the top in one screen.
- the polarity of the signal voltage Vsig with respect to the common voltage Vcom is negative over the entire screen.
- the polarity of the signal voltage Vsig with respect to the common voltage Vcom is shifted from negative to positive in the uppermost line in one screen.
- the polarity of the signal voltage Vsig with respect to the common voltage Vcom is shifted from negative to positive in the second and third lines from the top in one screen.
- the change of the polarity of the signal voltage Vsig with respect to the common voltage Vcom from positive to negative and from negative to positive over one screen every one field period is referred to as field inversion driving.
- FIG. 10 is a schematic diagram for explaining an example of field inversion driving according to the present embodiment.
- the controller 20 may always perform point-sequential driving in a specific direction in the horizontal direction when controlling field inversion driving.
- the controller 20 controls the pixel voltage Vpix so that the polarity of the signal voltage Vsig with respect to the common voltage Vcom is positive over the entire screen, and from left to right in the horizontal direction. Point-sequential driving is performed toward.
- the controller 20 controls the pixel voltage Vpix so that the polarity of the signal voltage Vsig with respect to the common voltage Vcom changes from positive to negative in the uppermost line in one screen, and from the left to the right in the horizontal direction. Point-sequential driving is performed toward.
- the controller 20 controls the pixel voltage Vpix so that the polarity of the signal voltage Vsig with respect to the common voltage Vcom is shifted from positive to negative in the second and third lines from the top in one screen. At the same time, point-sequential driving is performed from left to right in the horizontal direction. At time t4, the controller 20 controls the pixel voltage Vpix so that the polarity of the signal voltage Vsig with respect to the common voltage Vcom is negative over the entire screen, and the first and second stages from the bottom of the screen. In this line, point-sequential driving is performed from left to right in the horizontal direction.
- the controller 20 controls the pixel voltage Vpix so that the polarity of the signal voltage Vsig with respect to the common voltage Vcom shifts from negative to positive in the uppermost line in one screen, and from the left in the horizontal direction. Point-sequential driving is performed toward the right.
- the controller 20 controls the pixel voltage Vpix so that the polarity of the signal voltage Vsig with respect to the common voltage Vcom changes from negative to positive in the second and third lines from the top in one screen.
- point-sequential driving is performed from left to right in the horizontal direction.
- FIG. 11 is a schematic diagram for explaining an example of field inversion driving according to the present embodiment.
- the controller 20 may change the direction of dot sequential driving in the horizontal direction for each field period when controlling the field inversion driving.
- the controller 20 controls the pixel voltage Vpix so that the polarity of the signal voltage Vsig with respect to the common voltage Vcom is positive over the entire screen, and from left to right in the horizontal direction. Point-sequential driving is performed toward.
- the controller 20 controls the pixel voltage Vpix so that the polarity of the signal voltage Vsig with respect to the common voltage Vcom changes from positive to negative in the uppermost line in one screen, and from the right to the left in the horizontal direction. Point-sequential driving is performed toward.
- the controller 20 controls the pixel voltage Vpix so that the polarity of the signal voltage Vsig with respect to the common voltage Vcom is shifted from positive to negative in the second and third lines from the top in one screen. At the same time, point-sequential driving is performed from right to left in the horizontal direction. At time t4, the controller 20 controls the pixel voltage Vpix so that the polarity of the signal voltage Vsig with respect to the common voltage Vcom is negative over the entire screen, and the first and second stages from the bottom of the screen. In this line, point-sequential driving is performed from right to left in the horizontal direction.
- the controller 20 controls the pixel voltage Vpix so that the polarity of the signal voltage Vsig with respect to the common voltage Vcom shifts from negative to positive in the uppermost line in one screen, and from the left in the horizontal direction. Point-sequential driving is performed toward the right.
- the controller 20 controls the pixel voltage Vpix so that the polarity of the signal voltage Vsig with respect to the common voltage Vcom changes from negative to positive in the second and third lines from the top in one screen.
- point-sequential driving is performed from left to right in the horizontal direction.
- field inversion driving of the present embodiment will be described in comparison with the field inversion driving according to the comparative example.
- field inversion driving according to the present embodiment will be described.
- FIG. 12 and 13 are waveform diagrams for explaining an example of the field inversion driving according to the comparative example.
- FIG. 12 is a waveform diagram when the controller according to the comparative example performs control for DC driving of the counter electrode of the liquid crystal cell.
- FIG. 13 is a waveform diagram when the controller according to the comparative example performs control for AC driving the counter electrode of the liquid crystal cell.
- the horizontal axis represents time and the vertical axis represents voltage.
- the top two diagrams are waveform diagrams of signals applied to the pixel 11 located at “11a” in FIGS. 9 to 11.
- the two diagrams in the center are waveform diagrams of signals applied to the pixel 11 located at “11b” in FIGS. 9 to 11.
- the bottom two diagrams are waveform diagrams of signals applied to the pixel 11 located at “11c” in FIGS. 9 to 11.
- the leak period is longer at the pixel 11c at the bottom of the screen than the pixel 11b at the center of the screen, and the amount of leak is greater at the pixel 11c at the bottom of the screen than the pixel 11b at the center of the screen.
- the leak period and the leak amount are greatly different between the upper part of the screen, the center part of the screen, and the lower part of the screen.
- the characteristics of the pixel transistor Tr vary for each pixel 11. Therefore, the leak amount differs not only in the vertical direction of the screen but also for each pixel 11. As a result, for example, as shown in FIG. 14, shading occurs from the center of the screen to the lower side, mottled patterns occur, and image quality deteriorates.
- FIG. 15 illustrates an example of the effective display period Te and the blanking period Tf in the comparative example.
- the horizontal axis represents time.
- the display resolution on the horizontal axis is 400 ⁇ sec (display resolution inferior to 200 ⁇ sec) when one field period is 1/60 sec ( ⁇ 16.7 msec).
- the display resolution on the horizontal axis is 200 ⁇ sec when one field period is 1/120 sec ( ⁇ 8.3 msec).
- the display resolution on the horizontal axis is 200 ⁇ sec when one field period is 1/180 sec ( ⁇ 5.6 msec).
- the display resolution on the horizontal axis is 100 ⁇ sec when one field period is 1/240 sec ( ⁇ 4.2 msec). In FIG. 15, the display resolution on the horizontal axis is 500 ⁇ sec (display resolution inferior to 200 ⁇ sec) when one field period is 1/50 sec ( ⁇ 20.0 msec). In FIG. 15, the display resolution on the horizontal axis is 300 ⁇ sec (display resolution inferior to 200 ⁇ sec) when one field period is 1/100 sec ( ⁇ 20.0 msec). In FIG. 15, the display resolution on the horizontal axis is 200 ⁇ sec when one field period is 1/150 sec ( ⁇ 6.7 msec). In FIG. 15, the display resolution on the horizontal axis is 200 ⁇ sec when one field period is 1/200 sec ( ⁇ 6.7 msec).
- the display resolution represents the ability to identify a waveform in the display when the waveform is measured with an oscilloscope or the like and displayed on the display. For example, when the display resolution on the horizontal axis is 100 ⁇ sec, a pulse of less than 100 ⁇ sec is represented by a single line. For example, when the display resolution of the horizontal axis is 100 ⁇ sec, two pulses with a gap of less than 100 ⁇ sec are represented by one line or two pulses without a gap.
- the effective display period Te occupies most of one field period from the viewpoint of increasing luminance and securing a timing margin, and generally occupies about 98%. That is, the blanking period Tf occupies about 2% of one field period. Therefore, when one field period is 1/60 sec, the blanking period Tf occupying the entire one field period is about 333 ⁇ sec. When one field period is 1/120 sec, the blanking period Tf occupying the entire one field period is about 167 ⁇ sec. When one field period is 1/180 sec, the blanking period Tf occupying the entire one field period is about 111 ⁇ sec. Further, when one field period is 1/240 sec, the blanking period Tf occupying the entire one field period is about 83 ⁇ sec.
- the blanking period Tf occupying the entire one field period is about 400 ⁇ sec.
- the blanking period Tf occupying the entire one field period is about 200 ⁇ sec.
- the blanking period Tf occupying the entire one field period is about 133 ⁇ sec.
- the blanking period Tf occupying the entire one field period is about 100 ⁇ sec.
- the blanking period Tf is less than the display resolution of the horizontal axis. Accordingly, at this time, the blanking period Tf is represented by one line, and the two effective display periods Te having a gap of about 333 ⁇ sec are represented by two effective display periods Te without a gap. In addition, when one field period is 1/120 sec and the horizontal axis display resolution is 200 ⁇ sec, the blanking period Tf is less than the horizontal axis display resolution. Accordingly, at this time, the blanking period Tf is represented by one line, and the two effective display periods Te having a gap of about 167 ⁇ sec are represented by two effective display periods Te without a gap.
- the blanking period Tf is less than the display resolution on the horizontal axis. Accordingly, at this time, the blanking period Tf is represented by one line, and the two effective display periods Te having a gap of about 111 ⁇ sec are represented by two effective display periods Te without a gap. Further, when one field period is 1/240 sec and the horizontal axis display resolution is 100 ⁇ sec, the blanking period Tf is less than the horizontal axis display resolution. Accordingly, at this time, the blanking period Tf is represented by one line, and the two effective display periods Te having a gap of about 83 ⁇ sec are represented by two effective display periods Te without a gap.
- the blanking period Tf is less than the display resolution on the horizontal axis. Therefore, at this time, the blanking period Tf is represented by one line, and the two effective display periods Te having a gap of about 400 ⁇ sec are represented by two effective display periods Te without a gap. Further, when one field period is approximately 1/100 sec and the horizontal axis display resolution is 300 ⁇ sec, the blanking period Tf is less than the horizontal axis display resolution. Therefore, at this time, the blanking period Tf is represented by one line, and the two effective display periods Te having a gap of about 200 ⁇ sec are represented by two effective display periods Te without a gap.
- the blanking period Tf is less than the horizontal axis display resolution. Therefore, at this time, the blanking period Tf is represented by one line, and the two effective display periods Te having a gap of about 133 ⁇ sec are represented by two effective display periods Te without a gap. Further, when one field period is approximately 1/200 sec and the display resolution on the horizontal axis is 200 ⁇ sec, the blanking period Tf is less than the display resolution on the horizontal axis. Accordingly, at this time, the blanking period Tf is represented by one line, and the two effective display periods Te having a gap of about 100 ⁇ sec are represented by two effective display periods Te without a gap.
- the ratio of the blanking period Tf to the effective display period Te is very small, immediately after the desired pixel voltage Vpix is applied to the lowermost pixel 11, the ratio to the common voltage Vcom is increased.
- the polarity of the signal voltage Vsig shifts from negative to positive. As a result, shading occurs from the center to the bottom of the screen, and mottled patterns occur, resulting in a deterioration in image quality.
- FIG. 16 and 17 are waveform diagrams for explaining an example of the field inversion driving according to the present embodiment.
- FIG. 16 is a waveform diagram when the controller 20 of the present embodiment performs control for DC driving of the counter electrode of the liquid crystal cell CL.
- FIG. 17 is a waveform diagram when the controller 20 of the present embodiment performs control for AC driving the counter electrode of the liquid crystal cell CL.
- the horizontal axis represents time
- the vertical axis represents voltage
- the horizontal axis represents time
- the top two diagrams are waveform diagrams of signals applied to the pixel 11 located at the position “11a” in FIGS. 16 and 17, the two diagrams in the center are waveform diagrams of signals applied to the pixel 11 located at the position “11b” in FIGS. 9 to 11.
- the bottom two diagrams are waveform diagrams of signals applied to the pixel 11 located at the position “11c” in FIGS. 9 to 11.
- the controller 20 controls the active matrix drive by the field inversion drive method so that the vertical scanning speed is higher than the vertical scanning speed according to the comparative example in each one field period. Do. For this reason, the polarity of the signal voltage Vsig with respect to the common voltage Vcom changes from negative to positive after a lapse of time after the desired pixel voltage Vpix is applied to the lowermost pixel 11. As a result, the difference between the leak period and the leak amount becomes smaller in the upper part of the screen, the central part of the screen, and the lower part of the screen than in the comparative example. As a result, for example, as shown in FIG. 18, the region where shading and mottled patterns occur is shifted to the lower part of the screen as compared with the comparative example, and the shading and mottled patterns become less conspicuous as compared with the comparative example. .
- FIG. 19A shows an example of the effective display period Te and the blanking period Tf when the controller 20 of the present embodiment DC-drives the counter electrode of the liquid crystal cell CL. That is, in FIG. 19A, the controller 20 controls the field inversion drive while keeping the common voltage Vcom at a fixed potential.
- FIG. 19B is an enlarged view of the waveform diagram of FIG. 19A.
- FIG. 20A shows an example of the effective display period Te and the blanking period Tf when the controller 20 of the present embodiment AC drives the counter electrode of the liquid crystal cell CL. That is, in FIG. 20A, the controller 20 controls the field inversion drive so that the common voltage Vcom changes every field period.
- FIG. 20A shows an example of the effective display period Te and the blanking period Tf when the controller 20 of the present embodiment DC-drives the counter electrode of the liquid crystal cell CL. That is, in FIG. 20A, the controller 20 controls the field inversion drive so that the common voltage Vcom changes every field period.
- FIG. 20A shows an example of the effective display
- FIG. 20B is an enlarged view of the waveform diagram of FIG. 20A.
- the horizontal axis is time.
- the display resolution on the horizontal axis is 400 ⁇ sec (display resolution inferior to 200 ⁇ sec) when one field period is 1/60 sec.
- the display resolution on the horizontal axis is 200 ⁇ sec when one field period is 1/120 sec.
- the display resolution on the horizontal axis is 200 ⁇ sec when one field period is 1/180 sec.
- the display resolution on the horizontal axis is 100 ⁇ sec when one field period is 1/240 sec.
- the display resolution on the horizontal axis is 500 ⁇ sec (display resolution inferior to 200 ⁇ sec) when one field period is 1/50 sec.
- the display resolution on the horizontal axis is 300 ⁇ sec (display resolution inferior to 200 ⁇ sec) when one field period is 1/100 sec.
- the display resolution on the horizontal axis is 200 ⁇ sec when one field period is 1/150 sec.
- the display resolution on the horizontal axis is 200 ⁇ sec when one field period is 1/200 sec.
- 19B and 20B the display resolution on the horizontal axis is 1 ⁇ sec.
- the period from the rising time to the falling time of the common voltage Vcom, or the period from the falling time to the rising time of the common voltage Vcom coincides with one field period.
- the controller 20 controls the active matrix drive by the field inversion drive method so that the effective display period Ta approaches the start of one field period. Therefore, in each one field period, the vertical scanning speed is faster than the vertical scanning speed according to the comparative example. As a result, the effective display period Ta is shorter than the effective display period Te, and the blanking period Tb is longer than 2% of one field period.
- the controller 20 has an effective display period when one field period is 1/60 sec and the signal waveform output from the controller 20 is observed with a display resolution of 400 ⁇ sec (a display resolution inferior to 200 ⁇ sec).
- Active matrix drive control is performed by a field inversion drive method so that Ta is closer to the start of one field period.
- the controller 20 controls the active matrix driving by the field inversion driving method so that the blanking period Tb occupying the entire one field period is longer than 400 ⁇ sec when the one field period is 1/60 sec. .
- the controller 20 sets the blanking period Tb following the effective display period Ta to 1/120 sec (1
- the active matrix drive may be controlled by the field inversion drive method so that it is equal to or longer than 1 ⁇ 2) of the field period.
- the output timing of the signal voltage Vsig output from the horizontal drive circuit 32 to each signal line Sig is, for example, 1 field period is 1/120 sec and the effective display period Te is 1.
- the output timing of the signal voltage Vsig output from the horizontal drive circuit 32 to each signal line Sig may be equal.
- the controller 20 sets the blanking period Tb following the effective display period Ta to 2/180 sec (1
- the active matrix drive may be controlled by the field inversion drive method so that it is not less than 2/3) of the field period.
- the output timing of the signal voltage Vsig output from the horizontal drive circuit 32 to each signal line Sig is, for example, 1 field period is 1/180 sec and the effective display period Te is 1.
- the output timing of the signal voltage Vsig output from the horizontal drive circuit 32 to each signal line Sig may be equal.
- the controller 20 sets the blanking period Tb following the effective display period Ta to 3/240 sec (1/60 sec) when one field period is 1/60 sec.
- the active matrix driving may be controlled by the field inversion driving method so as to be 3/4) or more of the field period.
- the output timing of the signal voltage Vsig output from the horizontal drive circuit 32 to each signal line Sig is, for example, 1 field period is 1/240 sec and the effective display period Te is 1.
- the output timing of the signal voltage Vsig output from the horizontal drive circuit 32 to each signal line Sig may be equal.
- the controller 20 When the one field period is 1/120 sec and the signal waveform output from the controller 20 is observed with a display resolution of 200 ⁇ sec, the controller 20 has an effective display period Ta at the start of one field period.
- the active matrix drive is controlled by the field inversion drive method so as to be closer. Specifically, when one field period is 1/120 sec, the controller 20 controls the active matrix driving by the field inversion driving method so that the blanking period Tf following the effective display period Ta is longer than 200 ⁇ sec. Do.
- the controller 20 sets the blanking period Tb following the effective display period Ta to (1/120 sec ⁇ ) when one field period is 1/120 sec.
- the active matrix drive may be controlled by the field inversion drive method so that 1/180 sec) (1/6 of one field period) or more.
- the output timing of the signal voltage Vsig output from the horizontal drive circuit 32 to each signal line Sig is, for example, 1 field period is 1/180 sec and the effective display period Te is 1.
- the output timing of the signal voltage Vsig output from the horizontal drive circuit 32 to each signal line Sig may be equal.
- the controller 20 sets the blanking period Tb following the effective display period Ta to 1/240 sec (1
- the active matrix drive may be controlled by the field inversion drive method so that it is equal to or longer than 1 ⁇ 2) of the field period.
- the output timing of the signal voltage Vsig output from the horizontal drive circuit 32 to each signal line Sig is, for example, 1 field period is 1/240 sec and the effective display period Te is 1.
- the output timing of the signal voltage Vsig output from the horizontal drive circuit 32 to each signal line Sig may be equal.
- the controller 20 When the one field period is 1/180 sec and the signal waveform output from the controller 20 is observed with a display resolution of 200 ⁇ sec, the controller 20 has an effective display period Ta at the start of one field period.
- the active matrix drive is controlled by the field inversion drive method so as to be closer. Specifically, when one field period is 1/180 sec, the controller 20 controls the active matrix drive by the field inversion driving method so that the blanking period Tf occupying the entire one field period is longer than 200 ⁇ sec. .
- the controller 20 sets the blanking period Tb following the effective display period Ta to (1/180 sec ⁇
- the active matrix driving may be controlled by the field inversion driving method so that it becomes 1/240 sec) (1/12 of one field period) or more.
- the output timing of the signal voltage Vsig output from the horizontal drive circuit 32 to each signal line Sig is, for example, 1 field period is 1/240 sec and the effective display period Te is 1.
- the output timing of the signal voltage Vsig output from the horizontal drive circuit 32 to each signal line Sig may be equal.
- the controller 20 has an effective display period when one field period is 1/50 sec and the signal waveform output from the controller 20 is observed with a display resolution of 500 ⁇ sec (display resolution inferior to 200 ⁇ sec). Active matrix drive control is performed by a field inversion drive method so that Ta is closer to the start of one field period. Specifically, when one field period is 1/50 sec, the controller 20 controls the active matrix drive by the field inversion driving method so that the blanking period Tb occupying the entire one field period is longer than 500 ⁇ sec. .
- the controller 20 sets the blanking period Tb following the effective display period Ta to 1/100 sec (1
- the active matrix drive may be controlled by the field inversion drive method so that it is equal to or longer than 1 ⁇ 2) of the field period.
- the output timing of the signal voltage Vsig output from the horizontal drive circuit 32 to each signal line Sig is, for example, 1 field period is 1/100 sec and the effective display period Te is 1.
- it may be equal to the output timing of the signal voltage Vsig output from the horizontal drive circuit 32 to each signal line Sig.
- the controller 20 sets the blanking period Tb following the effective display period Ta to 2/150 sec (1
- the active matrix drive may be controlled by the field inversion drive method so that it is not less than 2/3) of the field period.
- the output timing of the signal voltage Vsig output from the horizontal drive circuit 32 to each signal line Sig is 1/150 sec in one field period and 1 in the effective display period Te.
- the output timing of the signal voltage Vsig output from the horizontal drive circuit 32 to each signal line Sig may be equal.
- the controller 20 sets the blanking period Tb following the effective display period Ta to 3/200 sec (1/50 sec) when one field period is 1/50 sec.
- the active matrix driving may be controlled by the field inversion driving method so as to be 3/4) or more of the field period.
- the output timing of the signal voltage Vsig output from the horizontal drive circuit 32 to each signal line Sig is, for example, 1 field period is 1/200 sec and the effective display period Te is 1.
- it may be equal to the output timing of the signal voltage Vsig output from the horizontal drive circuit 32 to each signal line Sig.
- the controller 20 sets the effective display period Ta to the start of the one field period.
- the active matrix drive is controlled by the field inversion drive method so as to be closer. Specifically, when one field period is 1/100 sec, the controller 20 controls the active matrix driving by the field inversion driving method so that the blanking period Tf that follows the effective display period Ta becomes larger than 300 ⁇ sec. Do.
- the controller 20 determines that the blanking period Tb following the effective display period Ta is (1/100 sec ⁇ ) when one field period is 1/100 sec.
- the active matrix drive control may be performed by the field inversion drive method so that 1/150 sec) (1/6 of one field period) or more.
- the output timing of the signal voltage Vsig output from the horizontal drive circuit 32 to each signal line Sig is 1/150 sec in one field period and 1 in the effective display period Te.
- the output timing of the signal voltage Vsig output from the horizontal drive circuit 32 to each signal line Sig may be equal.
- the controller 20 sets the blanking period Tb following the effective display period Ta to 1/200 sec (1) when the one field period is 1/100 sec.
- the active matrix drive may be controlled by the field inversion drive method so that it is equal to or longer than 1 ⁇ 2) of the field period.
- the output timing of the signal voltage Vsig output from the horizontal drive circuit 32 to each signal line Sig is, for example, 1 field period is 1/200 sec and the effective display period Te is 1.
- it may be equal to the output timing of the signal voltage Vsig output from the horizontal drive circuit 32 to each signal line Sig.
- the controller 20 When the one field period is 1/150 sec and the signal waveform output from the controller 20 is observed with a display resolution of 200 ⁇ sec, the controller 20 has an effective display period Ta at the start of one field period.
- the active matrix drive is controlled by the field inversion drive method so as to be closer. Specifically, the controller 20 controls the active matrix driving by the field inversion driving method so that the blanking period Tf occupying the entire one field period is longer than 200 ⁇ sec when the one field period is 1/150 sec. .
- the controller 20 sets the blanking period Tb following the effective display period Ta to (1/150 sec ⁇ ) when one field period is 1/150 sec.
- the active matrix drive may be controlled by the field inversion drive method so that it becomes 1/200 sec) (1/12 of one field period) or more.
- the output timing of the signal voltage Vsig output from the horizontal drive circuit 32 to each signal line Sig is, for example, 1 field period is 1/200 sec and the effective display period Te is 1.
- it may be equal to the output timing of the signal voltage Vsig output from the horizontal drive circuit 32 to each signal line Sig.
- the effective display period Ta occupying the entire one field period is The active matrix drive is controlled by the field inversion drive method so as to approach the start of one field period.
- the ratio of the blanking period Tf to the effective display period Ta becomes very large as compared with the comparative example. Therefore, the polarity of the signal voltage Vsig with respect to the common voltage Vcom changes from negative to positive after a while after the desired pixel voltage Vpix is applied to the lowermost pixel 11.
- the difference in leak period and leak amount is significantly smaller than in the comparative example. As a result, for example, as shown in FIG.
- the region where shading and mottled patterns occur is shifted to the lower side of the screen to the extent that the user can intuitively recognize compared to the comparative example. Furthermore, shading and mottled patterns become less noticeable to the extent that the user can intuitively recognize them compared to the comparative example. Therefore, in this embodiment, it is possible to significantly suppress image quality degradation due to current leakage in field inversion driving.
- the controller 20 controls the active matrix driving by the field inversion driving method so that the blanking period Tb occupying the entire one field period is on the order of msec, for example, FIG. As shown at 33, there is almost no area where shading and mottled patterns occur. Therefore, in the present embodiment, when the active matrix driving is controlled by the field inversion driving method so that the blanking period Tb occupying the entire one field period is on the order of msec, Degradation of image quality due to leakage can be almost eliminated.
- Modification of First Embodiment> [Modification A]
- only one effective display period Ta is provided in one field period.
- the controller 20 displays two effective displays that occupy the entire one field period when the signal waveform output from the controller 20 is observed with a predetermined display resolution corresponding to the size of the one field period.
- the active matrix drive is controlled by the field inversion drive method so that the period Ta approaches the start of one field period.
- FIG. 35 illustrates a modification of the schematic configuration of the display device 1 according to the above embodiment.
- FIG. 36 illustrates an example of a schematic configuration of the display panel module 40 of the present modification.
- the liquid crystal driver 30 further includes a precharge circuit 33.
- the precharge circuit 33 generates a precharge signal (predetermined voltage) for precharging the pixel array unit 10 and applies it to the pixel array unit 10.
- the precharge circuit 33 is formed on the substrate 41 of the display panel module 40.
- FIG. 37 and 38 show examples of circuit configurations of the horizontal drive circuit 32 and the precharge circuit 33.
- FIG. The precharge circuit 33 is connected to each signal line Sig together with the horizontal drive circuit 32.
- the precharge circuit 33 is connected to each signal line Sig together with the horizontal drive circuit 32 shown in FIG.
- the precharge circuit 33 is connected to each signal line Sig together with the horizontal drive circuit 32 shown in FIG.
- the precharge circuit 33 operates based on a control signal supplied from the controller 20, and outputs the precharge signal voltage Vpsig in parallel to the pixel array unit 10 via each signal line Sig.
- the precharge signal voltage Vpsig includes a precharge signal voltage VpsigB, a precharge signal voltage VpsigG1, and a precharge signal voltage VpsigG2.
- the precharge signal voltage VpsigB is a signal voltage for reducing variations in the voltage of the counter electrode of each pixel 11, and has a fixed value regardless of the magnitude or polarity of the signal voltage Vsig.
- the precharge signal voltages VpsigG1 and VpsigG2 are signal voltages output following the precharge signal voltage VpsigB.
- the precharge signal voltage VpsigG1 is a signal voltage output immediately before the signal voltage Vsig is output when the polarity of the signal voltage Vsig is positive, and has a voltage value slightly lower than the signal voltage Vsig.
- the precharge signal voltage VpsigG2 is a signal voltage output immediately before the signal voltage Vsig is output when the polarity of the signal voltage Vsig is negative, and has a voltage value slightly higher than the signal voltage Vsig.
- the precharge signal voltages VpsigB and VpsigG1 or the precharge signal voltages VpsigB and VpsigG2 are applied immediately before the signal voltage Vsig is applied.
- FIG. 40 illustrates a perspective configuration example of the electronic apparatus 2 according to the present embodiment.
- the electronic device 2 is, for example, a mobile terminal provided with a display surface 2A on the main surface of a plate-shaped housing.
- the electronic device 2 corresponds to a specific example of “electronic device” of the present technology.
- the electronic device 2 includes, for example, the display device 1 according to the above-described embodiment and the modification thereof at the position of the display surface 2A. In the present embodiment, since the display device 1 is provided, the same effects as those of the first embodiment are obtained.
- FIG. 41 illustrates a schematic configuration example of the electronic apparatus 3 according to the present embodiment.
- the electronic device 3 is, for example, a notebook personal computer including a display surface 3A on the main surface of one of two foldable plate-shaped housings.
- the electronic device 3 corresponds to a specific example of “electronic device” of the present technology.
- the electronic device 3 includes, for example, the display device 1 according to the above embodiment and the modification thereof at the position of the display surface 3A. In the present embodiment, since the display device 1 is provided, the same effects as those of the first embodiment are obtained.
- FIG. 42 illustrates a schematic surface configuration example of the projector 4 according to the fourth embodiment of the present technology.
- the projector 4 includes, for example, a light source device 5, an image generation system 6, and a projection optical system 7.
- the image generation system 6 generates image light of a plurality of colors by modulating light (for example, white light) emitted from the light source device 5 based on the video signal, and combines the generated image light of the plurality of colors.
- the light is emitted to the projection optical system 7.
- the image generation system 6 includes an illumination optical system 610, an image generation unit 620, and an image composition unit 630.
- the projection optical system 7 projects the image light (synthesized image light) emitted from the image generation system 6 onto a screen or the like.
- the image generation system 6 corresponds to a specific example of “light modulation unit” of the present technology.
- the projection optical system 7 corresponds to a specific example of a “projection unit” of the present technology.
- the illumination optical system 610 decomposes light (for example, white light) emitted from the light source device 5 into a plurality of color lights.
- the illumination optical system 610 includes, for example, an integrator element 611, a polarization conversion element 612, a condenser lens 613, dichroic mirrors 614 and 615, and mirrors 616 to 618.
- the integrator element 611 includes, for example, a fly eye lens 611a and a fly eye lens 611b.
- the fly-eye lens 611a has a plurality of microlenses arranged two-dimensionally.
- the fly-eye lens 611b also has a plurality of microlenses arranged two-dimensionally.
- the fly-eye lens 611a divides light (for example, white light) emitted from the light source device 5 into a plurality of light beams and forms an image on each microlens in the fly-eye lens 611b.
- the fly-eye lens 611b functions as a secondary light source, and allows a plurality of parallel lights with uniform brightness to enter the polarization conversion element 612.
- the dichroic mirrors 614 and 615 selectively reflect color light in a predetermined wavelength range and transmit light in other wavelength ranges. For example, the dichroic mirror 614 selectively reflects red light. For example, the dichroic mirror 615 selectively reflects green light.
- the image generation unit 620 modulates each color light decomposed by the illumination optical system 610 based on a video signal corresponding to each color input from the outside, and generates image light of each color.
- the image generation unit 620 includes, for example, a light valve 621 for red light, a light valve 622 for green light, and a light valve 623 for blue light.
- the light valve 621 for red light modulates red light input from the illumination optical system 610 based on a video signal corresponding to red input from the outside, and generates red image light.
- the light valve 622 for green light modulates green light input from the illumination optical system 610 based on a video signal corresponding to green input from the outside, and generates green image light.
- the blue light light valve 623 modulates blue light input from the illumination optical system 610 based on a video signal corresponding to blue input from the outside, and generates blue image light.
- the light valve 621 for red light, the light valve 622 for green light, and the light valve 623 for blue light are configured by the display device 1 according to the above-described embodiment and its modification.
- the image composition unit 630 synthesizes the image light of each color generated by the image generation unit 620 to generate color image light.
- the display device 1 according to the above-described embodiment and its modification is used as the light valve 621 for red light, the light valve 622 for green light, and the light valve 623 for blue light. .
- the display apparatus 1 since the display apparatus 1 is provided, it has the same effect as the said 1st Embodiment.
- this technique can take the following composition.
- a control circuit for controlling driving of an electro-optic element When the signal waveform output from the control circuit is observed with a display resolution of 200 ⁇ sec or a display resolution inferior to 200 ⁇ sec, the vertical effective display period in one field period defined by the vertical start signal is the start of the one field period A control circuit that controls the active matrix drive using the field inversion drive method so that it is timed.
- the vertical effective display period is shorter than 1 ⁇ 2 of the one field period,
- An electro-optic element; A control circuit for controlling the driving of the electro-optic element, The control circuit has an effective display period in one field period defined by a vertical start signal when the signal waveform output from the control circuit is observed with a display resolution of 200 ⁇ sec or a display resolution lower than 200 ⁇ sec.
- a display device that controls the active matrix drive by the field inversion drive method so that it is closer to the start of the field period.
- the electro-optic element is A plurality of scan lines extending in the row direction; A plurality of signal lines extending in the column direction; A plurality of pixels provided one for each portion where the scanning line and the signal line cross each other; A vertical driving circuit connected to the plurality of scanning lines; A horizontal drive circuit connected to a plurality of the signal lines, Each said pixel is A liquid crystal cell; A pixel transistor for sampling the voltage of the signal line based on a signal input from the scanning line and writing to the liquid crystal cell; The display device according to (12), wherein the control circuit controls the vertical driving circuit and the horizontal driving circuit for active matrix driving by a field inversion driving method for each pixel.
- a display device The display device An electro-optic element; A control circuit for controlling the driving of the electro-optic element, The control circuit has an effective display period in one field period defined by a vertical start signal when the signal waveform output from the control circuit is observed with a display resolution of 200 ⁇ sec or a display resolution lower than 200 ⁇ sec.
- An electronic device that controls the active matrix drive using the field inversion drive method so that it is closer to the start of the field period.
- Illumination optics A plurality of electro-optic elements that generate image light by modulating light from the illumination optical system; A control circuit for controlling driving of the plurality of electro-optic elements; A projection optical system for projecting image light generated by the plurality of electro-optical elements, and The control circuit has an effective display period in one field period defined by a vertical start signal when the signal waveform output from the control circuit is observed with a display resolution of 200 ⁇ sec or a display resolution lower than 200 ⁇ sec.
- a projection display device that controls the active matrix drive by the field inversion drive method so that it is closer to the start of the field period.
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Abstract
Description
1.第1の実施の形態(表示装置)
プリチャージ回路が省略されている例(図1~図33)
2.第1の実施の形態の変形例(表示装置)
変形例B:1F中にリフレッシュ書き込みが行われる例
(図34、図35)
変形例A:プリチャージ回路が設けられている例(図36~図39)
3.第3の実施の形態(電子機器)
第1の実施の形態およびその変形例に係る表示装置が電子機器に
用いられている例(図40)
4.第4の実施の形態(電子機器)
第1の実施の形態およびその変形例に係る表示装置が電子機器に
用いられている例(図41)
5.第5の実施の形態(プロジェクタ)
第1の実施の形態およびその変形例に係る表示装置がプロジェクタに用いられている例(図42)
[構成]
図1は、本開示の第1の実施の形態に係る表示装置1の概略構成の一例を表したものである。表示装置1は、3板式のプロジェクタ(投射型表示装置)のライトバルブとして適用可能なものである。表示装置1は、例えば、画素アレイ部10、コントローラ20および液晶ドライバ30を備えている。画素アレイ部10は、透過型となっていてもよいし、反射型となっていてもよい。なお、画素アレイ部10が透過型となっている場合には、表示装置1は、必要に応じて、画素アレイ部10の背後に、図示しない光源を備えていてもよい。表示装置1は、本開示の「表示装置」の一具体例に相当する。コントローラ20は、本開示の「制御回路」の一具体例に相当する。
画素アレイ部10は、例えば、ノーマリーブラックの透過率特性または反射率特性となっている。ここで、ノーマリーブラックとは、電圧がかかっていない時に透過率あるいは反射率が最小となり 、黒表示になる光学特性を指している。なお、画素アレイ部10は、例えば、ノーマリーホワイトの透過率特性または反射率特性となっていてもよい。ここで、ノーマリーホワイトとは、電圧がかかっていない時に透過率あるいは反射率が最大となり、白表示になる光学特性を指している。画素アレイ部10は、電圧印加により光の偏光状態を電気的に変えることで画像光を生成するものである。
液晶ドライバ30は、各画素11をアクティブマトリクス駆動することにより、外部から入力された映像信号に基づく画像光を画素アレイ部10から生成させる。液晶ドライバ30は、複数の走査線WSに接続された垂直駆動回路31と、複数の信号線に接続された水平駆動回路32とを有している。
コントローラ20は、液晶ドライバ30に対して、各画素11の、フィールド反転駆動方式によるアクティブマトリクス駆動の制御を行う。フィールド反転駆動方式については、後に詳述する。コントローラ20は、信号処理回路31、タイミング生成回路32、反転回路33、VCOM回路34および電源生成回路25を有している。
図9は、本実施の形態のフィールド反転駆動の一例について説明するための模式図である。フィールド反転駆動とは、1フィールド期間(1F)ごとに液晶セルCLのコモン電圧Vcomに対して極性を反転させた信号電圧Vsigを液晶セルCLに印加する駆動を指している。図9において、「+」とは、信号電圧Vsigの極性がコモン電圧Vcomに対して正であることを指している。図9において、「-」とは、信号電圧Vsigの極性がコモン電圧Vcomに対して負であることを指している。つまり、「+」「-」とは、信号電圧Vsigの、コモン電圧Vcomに対する相対的な大小関係を表したものである。
[変形例A]
上記実施の形態では、1フィールド期間内に1つだけ有効表示期間Taが設けられていた。しかし、例えば、図34に示したように、有効表示期間Taが、1フィールド期間の1/2よりも短い場合には、1フィールド期間内に2つの有効表示期間Taが設けられていてもよい。ただし、本変形例では、コントローラ20は、コントローラ20から出力される信号波形が1フィールド期間の大きさに応じた所定の表示分解能で観察されたときに、1フィールド期間全体に占める2つの有効表示期間Taが1フィールド期間の開始時寄りとなるように、フィールド反転駆動方式でアクティブマトリクス駆動の制御が行われる。
図35は、上記実施の形態の表示装置1の概略構成の一変形例を表したものである。図36は、本変形例の表示パネルモジュール40の概略構成の一例を表したものである。本変形例では、液晶ドライバ30は、プリチャージ回路33をさらに有している。プリチャージ回路33は、画素アレイ部10をプリチャージするプリチャージ信号(所定の電圧)を生成し、画素アレイ部10に印加するようになっている。プリチャージ回路33は、表示パネルモジュール40の基板41上に形成されている。
次に、本技術の第2の実施の形態に係る電子機器2について説明する。図40は、本実施の形態に係る電子機器2の斜視構成例を表したものである。電子機器2は、例えば、板状の筐体の主面に表示面2Aを備えた携帯端末である。電子機器2は、本技術の「電子機器」の一具体例に対応する。電子機器2は、例えば、表示面2Aの位置に、上記実施の形態およびその変形例に係る表示装置1を備えている。本実施の形態では、表示装置1が設けられているので、上記第1の実施の形態と同様の効果を有している。
次に、本技術の第3の実施の形態に係る電子機器3について説明する。図41は、本実施の形態に係る電子機器3の概略構成例を表したものである。電子機器3は、例えば、折りたたみ可能な2枚の板状の筐体のうちの一方の筐体の主面に表示面3Aを備えたノート型のパーソナルコンピュータである。電子機器3は、本技術の「電子機器」の一具体例に対応する。電子機器3は、例えば、表示面3Aの位置に、上記実施の形態およびその変形例に係る表示装置1を備えている。本実施の形態では、表示装置1が設けられているので、上記第1の実施の形態と同様の効果を有している。
[構成]
次に、本技術の第4の実施の形態に係るプロジェクタ4について説明する。プロジェクタ4は、本技術の「投射型表示装置」の一具体例に対応する。図42は、本技術の第4の実施の形態に係るプロジェクタ4の概略面構成例を表したものである。プロジェクタ4は、例えば、光源装置5、画像生成システム6および投射光学系7を備えている。
次に、本実施の形態のプロジェクタ4の効果について説明する。
(1)
電気光学素子の駆動を制御する制御回路であって、
当該制御回路から出力される信号波形が200μsecの表示分解能または200μsecよりも劣る表示分解能で観察されたときに、垂直スタート信号によって規定される1フィールド期間における垂直有効表示期間が前記1フィールド期間の開始時寄りとなるように、フィールド反転駆動方式でアクティブマトリクス駆動の制御を行う
制御回路。
(2)
前記1フィールド期間ごとに前記電気光学素子のコモン電圧に対して極性を反転させた信号電圧が前記電気光学素子に印加されるようにフィールド反転駆動の制御を行う
(1)に記載の制御回路。
(3)
前記1フィールド期間ごとに前記コモン電圧が変化するようにフィールド反転駆動の制御を行う
(2)に記載の制御回路。
(4)
前記コモン電圧を固定電位にしつつフィールド反転駆動の制御を行う
(2)に記載の制御回路。
(5)
前記垂直ブランキング期間が、前記1フィールド期間の1/2以上となっている
(1)ないし(4)のいずれか1つに記載の制御回路。
(6)
前記垂直ブランキング期間が、前記1フィールド期間の2/3以上となっている
(1)ないし(4)のいずれか1つに記載の制御回路。
(7)
前記垂直ブランキング期間が、前記1フィールド期間の3/4以上となっている
(1)ないし(4)のいずれか1つに記載の制御回路。
(8)
前記垂直ブランキング期間が、前記1フィールド期間の1/6以上となっている
(1)ないし(4)のいずれか1つに記載の制御回路。
(9)
前記垂直ブランキング期間が、前記1フィールド期間の1/12以上となっている
(1)ないし(4)のいずれか1つに記載の制御回路。
(10)
前記1フィールド期間内に1つだけ前記垂直有効表示期間が設けられている
(1)ないし(9)のいずれか1つに記載の制御回路。
(11)
前記垂直有効表示期間は、前記1フィールド期間の1/2よりも短く、
前記1フィールド期間内に2つだけ前記垂直有効表示期間が設けられている
(1)ないし(10)のいずれか1つに記載の制御回路。
(12)
電気光学素子と、
前記電気光学素子の駆動を制御する制御回路と
を備え、
前記制御回路は、当該制御回路から出力される信号波形が200μsecの表示分解能または200μsecよりも劣る表示分解能で観察されたときに、垂直スタート信号によって規定される1フィールド期間における有効表示期間が前記1フィールド期間の開始時寄りとなるように、フィールド反転駆動方式でアクティブマトリクス駆動の制御を行う
表示装置。
(13)
前記電気光学素子は、
行方向に延在する複数の走査線と、
列方向に延在する複数の信号線と、
前記走査線と前記信号線とが互いに交差する箇所ごとに1つずつ設けられた複数の画素と、
複数の前記走査線に接続された垂直駆動回路と、
複数の前記信号線に接続された水平駆動回路と
を有し、
各前記画素は、
液晶セルと、
前記走査線から入力される信号に基づいて前記信号線の電圧をサンプリングするとともに前記液晶セルに書き込む画素トランジスタと
を有し、
前記制御回路は、前記垂直駆動回路および前記水平駆動回路に対して、各前記画素のフィールド反転駆動方式によるアクティブマトリクス駆動の制御を行う
(12)に記載の表示装置。
(14)
表示装置を備え、
前記表示装置は、
電気光学素子と、
前記電気光学素子の駆動を制御する制御回路と
を有し、
前記制御回路は、当該制御回路から出力される信号波形が200μsecの表示分解能または200μsecよりも劣る表示分解能で観察されたときに、垂直スタート信号によって規定される1フィールド期間における有効表示期間が前記1フィールド期間の開始時寄りとなるように、フィールド反転駆動方式でアクティブマトリクス駆動の制御を行う
電子機器。
(15)
照明光学系と、
前記照明光学系からの光を変調することで画像光を生成する複数の電気光学素子と、
複数の前記電気光学素子の駆動を制御する制御回路と、
複数の前記電気光学素子で生成された画像光を投射する投影光学系と
を備え、
前記制御回路は、当該制御回路から出力される信号波形が200μsecの表示分解能または200μsecよりも劣る表示分解能で観察されたときに、垂直スタート信号によって規定される1フィールド期間における有効表示期間が前記1フィールド期間の開始時寄りとなるように、フィールド反転駆動方式でアクティブマトリクス駆動の制御を行う
投射型表示装置。
Claims (15)
- 電気光学素子の駆動を制御する制御回路であって、
当該制御回路から出力される信号波形が200μsecの表示分解能または200μsecよりも劣る表示分解能で観察されたときに、垂直スタート信号によって規定される1フィールド期間における垂直有効表示期間が前記1フィールド期間の開始時寄りとなるように、フィールド反転駆動方式でアクティブマトリクス駆動の制御を行う
制御回路。 - 前記1フィールド期間ごとに前記電気光学素子のコモン電圧に対して極性を反転させた信号電圧が前記電気光学素子に印加されるようにフィールド反転駆動の制御を行う
請求項1に記載の制御回路。 - 前記1フィールド期間ごとに前記コモン電圧が変化するようにフィールド反転駆動の制御を行う
請求項2に記載の制御回路。 - 前記コモン電圧を固定電位にしつつ、フィールド反転駆動の制御を行う
請求項2に記載の制御回路。 - 前記垂直ブランキング期間が、前記1フィールド期間の1/2以上となっている
請求項2に記載の制御回路。 - 前記垂直ブランキング期間が、前記1フィールド期間の2/3以上となっている
請求項2に記載の制御回路。 - 前記垂直ブランキング期間が、前記1フィールド期間の3/4以上となっている
請求項2に記載の制御回路。 - 前記垂直ブランキング期間が、前記1フィールド期間の1/6以上となっている
請求項2に記載の制御回路。 - 前記垂直ブランキング期間が、前記1フィールド期間の1/12以上となっている
請求項2に記載の制御回路。 - 前記1フィールド期間内に1つだけ前記垂直有効表示期間が設けられている
請求項2に記載の制御回路。 - 前記垂直有効表示期間は、前記1フィールド期間の1/2よりも短く、
前記1フィールド期間内に2つだけ前記垂直有効表示期間が設けられている
請求項2に記載の制御回路。 - 電気光学素子と、
前記電気光学素子の駆動を制御する制御回路と
を備え、
前記制御回路は、当該制御回路から出力される信号波形が200μsecの表示分解能または200μsecよりも劣る表示分解能で観察されたときに、垂直スタート信号によって規定される1フィールド期間における垂直有効表示期間が前記1フィールド期間の開始時寄りとなるように、フィールド反転駆動方式でアクティブマトリクス駆動の制御を行う
表示装置。 - 前記電気光学素子は、
行方向に延在する複数の走査線と、
列方向に延在する複数の信号線と、
前記走査線と前記信号線とが互いに交差する箇所ごとに1つずつ設けられた複数の画素と、
複数の前記走査線に接続された垂直駆動回路と、
複数の前記信号線に接続された水平駆動回路と
を有し、
各前記画素は、
液晶セルと、
前記走査線から入力される信号に基づいて前記信号線の電圧をサンプリングするとともに前記液晶セルに書き込む画素トランジスタと
を有し、
前記制御回路は、前記垂直駆動回路および前記水平駆動回路に対して、各前記画素のフィールド反転駆動方式によるアクティブマトリクス駆動の制御を行う
請求項12に記載の表示装置。 - 表示装置を備え、
前記表示装置は、
電気光学素子と、
前記電気光学素子の駆動を制御する制御回路と
を有し、
前記制御回路は、当該制御回路から出力される信号波形が200μsecの表示分解能または200μsecよりも劣る表示分解能で観察されたときに、垂直スタート信号によって規定される1フィールド期間における垂直有効表示期間が前記1フィールド期間の開始時寄りとなるように、フィールド反転駆動方式でアクティブマトリクス駆動の制御を行う
電子機器。 - 照明光学系と、
前記照明光学系からの光を変調することで画像光を生成する複数の電気光学素子と、
複数の前記電気光学素子の駆動を制御する制御回路と、
複数の前記電気光学素子で生成された画像光を投射する投影光学系と
を備え、
前記制御回路は、当該制御回路から出力される信号波形が200μsecの表示分解能または200μsecよりも劣る表示分解能で観察されたときに、垂直スタート信号によって規定される1フィールド期間における垂直有効表示期間が前記1フィールド期間の開始時寄りとなるように、フィールド反転駆動方式でアクティブマトリクス駆動の制御を行う
投射型表示装置。
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JPWO2016208321A1 (ja) * | 2015-06-26 | 2018-04-12 | ソニー株式会社 | 制御回路、表示装置、電子機器および投射型表示装置 |
US10475404B2 (en) * | 2016-12-27 | 2019-11-12 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Driving method of scan lines in display panel and driving device thereof |
CN109658893B (zh) * | 2019-01-30 | 2021-05-28 | 惠科股份有限公司 | 显示面板的驱动方法、驱动装置及显示设备 |
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