WO2015168968A1 - 一种场序液晶显示驱动方法及显示装置 - Google Patents
一种场序液晶显示驱动方法及显示装置 Download PDFInfo
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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
-
- 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
- G09G3/2003—Display of colours
-
- 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
- G09G3/3406—Control of illumination source
-
- 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
- G09G3/3607—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 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
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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
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/04—Structural and physical details of display devices
- G09G2300/0439—Pixel structures
- G09G2300/0452—Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
-
- 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
- G09G2310/0235—Field-sequential colour display
-
- 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
- G09G2310/08—Details of timing specific for flat panels, other than clock recovery
Definitions
- the present invention relates to the field of display technology, and in particular to a field sequential liquid crystal display driving method and display device.
- the Field Sequential Color LCD does not need to use a color filter, and the color field of the red, green, and blue colors is respectively provided by the backlight module to display red, green, and time series.
- the blue three-color image information is used to display a color image on the retina by the method of temporal color mixing using the human eye persistence characteristic. Therefore, FSC-LCD has the advantages of high light efficiency, high resolution and low cost, and has become a major trend in LCD development.
- the liquid crystal molecules are operated at a certain fixed voltage for a long period of time, the characteristics of the liquid crystal molecules are solidified. When this fixed voltage is removed, the liquid crystal molecules will not respond to changes in the applied voltage. Therefore, the liquid crystal driving method of the LCD is usually AC drive.
- the "one-color field-reverse" reversal method is usually used, that is, the polarity of the data voltage at both ends of the liquid crystal is reversed in the color fields of red, green, and blue.
- the odd field and the even field image are displayed, there is a difference in the absolute values of the positive voltage and the negative voltage applied to the data voltage across the liquid crystal. This causes the liquid crystal molecules to be in a DC bias driving state. If a static picture is displayed for a long time, the liquid crystal will be over-polarized and the rotation power will be lost. When other pictures are displayed, the liquid crystal will not rotate normally, thereby forming an afterimage.
- the present invention provides a field sequential liquid crystal display driving method capable of eliminating afterimages in view of the above problems in the prior art, and the method includes the following steps:
- the polarity of the data driving signal is periodically inverted such that its voltage waveform is symmetrical with respect to a common reference voltage.
- two color fields are generated in one frame period, and when the first color field is valid, the first portion of the data driving signal is supplied to each sub-pixel unit of one pixel to open the respective Each of the sub-pixel units thereby allowing light of the first color field to pass therethrough;
- the first portion and the second portion of the data driving signal have the same polarity.
- the first color field is valid for the same time as the second color field is valid.
- the period in which the polarity of the data drive signal is inverted is multiplied by the frame period.
- the period in which the polarity of the data drive signal is inverted is the same as the frame period.
- the polarity of the data driving signal is controlled to be periodically inverted by a polarity inversion control signal.
- At least one of the sub-pixel units is a transparent sub-pixel unit.
- the sub-pixel unit comprises two of a magenta sub-pixel unit, a cyan sub-pixel unit, and a yellow sub-pixel unit; or
- the sub-pixel unit includes two of a red sub-pixel unit, a green sub-pixel unit, and a blue sub-pixel unit.
- the backlight module in the first color field, the backlight module emits white light, and In the second color field, the backlight module emits one of red light, blue light or green light; or in the first color field, the backlight module emits magenta light, cyan light or One of the yellow lights, and in the second color field, the backlight module emits one of red light, blue light, or green light.
- a liquid crystal display device including:
- timing control unit configured to provide a color field sequence signal, such that the backlight module respectively generates a plurality of color fields in one frame period
- a data driving unit configured to provide a data driving signal to each sub-pixel unit of a pixel to activate a sub-pixel unit corresponding to the color field, where each color field is respectively valid;
- the timing control unit further provides a polarity inversion control signal to periodically invert the polarity of the data driving signal such that the voltage waveform thereof is symmetric with respect to the common reference voltage.
- the backlight module generates two color fields in one frame period, and when the first color field is valid, the data driving unit provides the data driving to each sub-pixel unit of one pixel. a first portion of the signal to turn on each of the respective sub-pixel units to transmit light of the first color field therefrom;
- the data driving unit When the second color field is active, the data driving unit provides a second portion of the data driving signal to each of the sub-pixel units in one pixel to open one or each of the respective sub-pixel units, thereby enabling The light of the second color field is transmitted from the opened sub-pixel unit;
- the first portion and the second portion of the data driving signal have the same polarity.
- the first color field generated by the backlight module is valid for the same time as the second color field.
- the period in which the polarity inversion control signal inverts the polarity of the data driving signal is in a multiple relationship with the frame period.
- the polarity inversion control signal inverts the polarity of the data driving signal by the same period as the frame period.
- At least one of the sub-pixel units is a transparent sub-pixel unit.
- the sub-pixel unit comprises two of a magenta sub-pixel unit, a cyan sub-pixel unit and a yellow sub-pixel unit;
- the sub-pixel unit includes two of a red sub-pixel unit, a green sub-pixel unit, and a blue sub-pixel unit.
- the driving method of the present invention can realize the inverted form of "two color field-inversion", in a plurality of color fields of each frame,
- the data voltage polarity of the sub-pixel unit is the same, and the polarity of the data voltage of each sub-pixel unit is inverted in the color field of the adjacent frame.
- the absolute values of the positive voltage and the negative voltage of the data voltage applied across the liquid crystal are made the same, thereby eliminating the afterimage.
- FIG. 1 is a schematic structural view of a field sequential liquid crystal display device according to a first embodiment of the present invention
- FIG. 2 is a schematic structural diagram of a pixel unit according to Embodiment 1 of the present invention.
- FIG. 2 is a timing diagram of related signals of a field sequential liquid crystal display device according to Embodiment 1 of the present invention
- FIG. 4 is a flow chart showing a driving method of a field sequential liquid crystal display device according to Embodiment 1 of the present invention.
- FIG. 5 is a schematic structural diagram of a pixel unit according to Embodiment 2 of the present invention.
- FIG. 6 is a timing diagram of related signals of a field sequential liquid crystal display device according to a second embodiment of the present invention.
- FIG. 7 is a flow chart of a driving method of a field sequential liquid crystal display device according to a second embodiment of the present invention.
- FIG. 8 is a schematic diagram of an inversion driving manner of an FSC-LCD according to a third embodiment of the present invention.
- Embodiment 1 is a diagrammatic representation of Embodiment 1:
- the liquid crystal display device 100 includes a display panel 110 , a scan driving unit 120 , a data driving unit 130 , and an image analyzing unit 140 , a timing control unit 150 , a main control unit 160 , and a backlight module 170 .
- the backlight module 170 is disposed on the display panel At the rear of 110, a light source is provided for display panel 110.
- Display panel 110 includes a plurality of pixels 112 arranged in a matrix, each pixel 112 including a plurality of sub-pixel units.
- the backlight module 170 in this embodiment includes a white light backlight (W) and a red light backlight (R), which is not shown in FIG.
- the scan driving unit 120 and the data driving unit 130 are electrically connected to the display panel 110, respectively.
- the timing control unit 150 is electrically connected to the scan driving unit 120 and the data driving unit 130 for controlling the scan driving unit 120 to scan the display panel 110, and controls the data driving unit 130 to drive the display panel 110 to display an image through the main control unit 160.
- the image analyzing unit 140 is electrically connected to the timing control unit 150 for decomposing each frame of image into first image data and second image data.
- the first portion of the data driving signal is provided to the plurality of sub-pixel units in the pixel 112 to display the first image data; when the red backlight (R) emits light Providing a second portion of the data drive signal to the plurality of sub-pixel units in pixel 112 to display the second image data.
- the timing control unit 150 generates a periodic polarity inversion control signal POL for inverting the polarity of the sub-pixel unit data voltage in the liquid crystal display panel.
- the backlight module 170 produces two color fields in each frame period. In the same frame period, the data voltages of the first portion and the second portion of the data driving signals of the plurality of sub-pixel units in the pixel 112 are the same. In the adjacent frame period, the polarity of the data voltage of each sub-pixel unit is inverted once.
- the main control unit 160 is electrically connected to the backlight module 170 to control the white light backlight (W) and the red light backlight (R) to alternately emit light.
- the backlight module 170 can emit white (W) light in synchronization with the first portion of the data driving signal according to the color field sequence signal FS from the main control unit 160, or emit red in synchronization with the second portion of the data driving signal. ) Light.
- FIG. 2 is a schematic structural diagram of a pixel unit in the embodiment.
- the pixel 112 includes three sub-pixel units arranged in parallel, which are a transparent sub-pixel unit (T), a green sub-pixel unit (G), and a blue sub-pixel unit (B).
- the transparent sub-pixel unit (T) can transmit light of all wavelengths
- the green sub-pixel unit (G) can transmit light of green wavelength
- the blue sub-pixel unit (B) can transmit light of blue wavelength.
- the gate lines G1, G2 sequentially gate each row of pixel units in a scanning manner such that the transparent sub-pixel unit (T), the green sub-pixel unit (G), and the blue sub-pixel unit ( B)
- the data voltage from the data driving unit 130 is received from the data lines D1, D2, D3, respectively.
- Fig. 3 is a timing chart showing the correlation of the field sequential liquid crystal display device of the embodiment.
- the polarity inversion control signal POL has a driving period of two frame periods, and the backlight module 170 forms a first color field and a second color field in each frame period.
- the data voltages of the sub-pixel units are opposite in polarity, so that The period in which the polarity of the data driving signal of the sub-pixel unit is inverted is the same as the frame period. That is, the polarity of the data driving signal of the sub-pixel unit is inverted once every one frame period.
- the period in which the polarity of the data driving signal is inverted may be an integer multiple of the frame period.
- each sub-pixel unit data voltage signal POL When the polarity inversion control signal POL is a high level signal, the data voltage of each sub-pixel unit is positive, that is, the voltage value is higher than the common electrode voltage.
- each sub-pixel unit data voltage signal When the polarity inversion control signal POL is a low level signal, each sub-pixel unit data voltage signal is negative, that is, the voltage value is lower than the common electrode voltage.
- the polarity of the sub-pixel unit data voltage in the liquid crystal display panel is periodically inverted such that its voltage waveform is symmetrical with respect to the common reference voltage.
- the polarity of the sub-pixel unit data voltage In the Nth frame, the polarity of the sub-pixel unit data voltage is positive. In the (N+1)th frame, the polarity of the sub-pixel unit data voltage is negative polarity.
- the color field sequence signal FS provided in this embodiment is a periodic square wave signal, and one frame period is used as one driving period.
- the backlight module 170 When the color field sequence signal FS is at a high level, the backlight module 170 generates a white color field; when the color field sequence signal FS is at a low level, the backlight module 170 generates a red color field.
- the effective time of the white color field and the red color field is the same. That is to say, the white light backlight (W) and the red light backlight (R) in the backlight module 170 have the same illumination time.
- the data voltage polarities of the respective sub-pixel units are the same; the first color field and the second color field of the adjacent frames The data voltages of the respective sub-pixel units are opposite in polarity.
- the white light backlight (W) in the backlight module 170 emits light, so that the white light color field is effective, and the data driving unit 130 drives the pixel 112 according to the first portion of the data driving signal.
- the plurality of sub-pixel units in the display display the first image data.
- the red backlight (R) in the backlight module 170 emits light, so that the red light field is effective, and the data driving unit 130 drives the pixel 112 according to the second portion of the data driving signal.
- the plurality of sub-pixel units display the second image data.
- the data voltage polarity of each sub-pixel unit does not reverse. Moreover, in the color field of the adjacent frame, the polarity of the data voltage of each sub-pixel unit is inverted.
- a polarity inversion manner of "two color field-inversion" is formed such that the data voltage waveform of each sub-pixel unit is symmetrical with respect to the common reference voltage, and the positive and negative voltages of the data voltage applied across the liquid crystal are The absolute value is the same, to achieve the purpose of eliminating afterimages.
- the polarity of the data voltage of each sub-pixel unit in the pixel 112 in different frames will be described below as an example.
- the polarity inversion control signal POL is at a high level, and the data voltages of the transparent sub-pixel unit (T), the green sub-pixel unit (G), and the blue sub-pixel unit ( ⁇ ) Both are positive.
- the color field sequence signal FS is at a high level, and the white light backlight (W) in the backlight module 170 emits light.
- the data driving unit 130 drives the plurality of sub-pixel units in the pixel 112 according to the first portion of the data driving signal to display the first image data with a positive data voltage.
- the first image data includes white image data, green image data, and blue image data.
- the white backlight passes through the transparent sub-pixel unit ( ⁇ ) to display white image data. And, the white backlight passes through the green sub-pixel unit (G) to display green image data. And, the white backlight passes through the blue sub-pixel unit (B) to display blue image data.
- the polarity inversion control signal POL is still at the high level. Therefore, the data voltages of the transparent sub-pixel unit (T), the green sub-pixel unit (G), and the blue sub-pixel unit (B) are all positive.
- the color field sequence signal FS is at a low level, and the red backlight (R) in the backlight module 170 emits light.
- the data driving unit 130 drives the plurality of sub-pixel units in the pixel 112 according to the second portion of the data driving signal to display the second image data with a positive data voltage.
- the second image data includes red image data and black image data. Specifically, the red backlight passes through the transparent sub-pixel unit (T) to display red image data. Also, both the green sub-pixel unit (G) and the blue sub-pixel unit (B) display black image data.
- the display panel 110 can display white, green, blue, and red pictures. Due to the visual persistence characteristics of the human eye, the user can view the color display.
- the polarity inversion control signal POL is a low level
- the data voltages are all negative polarity.
- the color field sequence signal FS is at a high level, and the white light backlight (W) in the backlight module 170 emits light.
- the data driving unit 130 drives the plurality of sub-pixel units in the pixel 112 according to the first portion of the data driving signal to display the first image data with a negative data voltage.
- the display format of the first image data is the same as that in the first color field of the Nth frame, and details are not described herein.
- the polarity inversion control signal POL is still at a low level. Therefore, the data voltages of the transparent sub-pixel unit (T), the green sub-pixel unit (G), and the blue sub-pixel unit (B) are all negative.
- the color field sequence signal FS is at a low level, and the red backlight (R) in the backlight module 170 emits light.
- the data driving unit 130 drives the plurality of sub-pixel units in the pixels 112 according to the second portion of the data driving signal to display the second image data with a negative data voltage.
- the display format of the second image data is the same as that in the second color field of the N+1th frame, and details are not described herein.
- the display panel 110 can display white, green, blue, and red pictures. Due to the visual persistence characteristics of the human eye, the user can view the color display.
- the Nth frame and the N+1th frame constitute one driving period of the polarity inversion control signal POL.
- the polarity inversion control signal POL in the Nth frame and the N+1th frame is inverted, so that the data voltage polarities of the plurality of sub-pixel units in the pixel 112 are inverted.
- Two color fields are generated in each frame period. And, in the two color fields of each frame, the data voltages of the sub-pixel units are the same polarity.
- a polarity inversion method of "two color field one inversion" is formed.
- FIG. 4 is a flow chart of a driving method of a field sequential liquid crystal display device according to an embodiment. The driving method of this embodiment will be described in detail below with reference to Fig. 4 .
- a color field sequence signal FS is provided, so that the backlight module 170 generates a plurality of color fields in one frame period.
- the backlight module 170 provides two color fields of a white color field and a red color field in one frame period.
- step S402 in a case where the respective color fields are respectively valid, a data driving signal is supplied to each sub-pixel unit of the pixel 112 to open a sub-pixel unit corresponding to the color field; and the data driving signal is The polarity is periodically inverted such that its voltage waveform is symmetrical with respect to the common reference voltage.
- the pixel 112 in this embodiment includes a transparent sub-pixel unit (T), a green sub-pixel unit (G), and a blue sub-pixel unit ( ⁇ ). The detailed driving process has been explained above and will not be described again.
- the driving method of this embodiment causes the display panel 110 to display red, green, and blue screens. Due to the visual persistence feature of the human eye, the user can view the color display. At the same time, the driving method of the embodiment can realize the inverted form of "two color field-inversion". In the two color fields of each frame, the data voltage polarity of the sub-pixel unit is the same, and the color field of the adjacent frame The data voltage polarity of each sub-pixel unit is inverted. The absolute values of the positive and negative voltages of the data voltage applied across the liquid crystal are the same, thereby eliminating afterimages.
- the TGB sub-pixel unit structure of the pixel unit and the combination of the white backlight and the red backlight in this embodiment can also be implemented by other similar embodiments.
- the pixel unit uses an RTB sub-pixel cell structure while alternately using a white backlight and a green backlight; or the pixel unit uses an RGT structure while alternately using a white backlight and a blue backlight.
- the pixel unit uses a sub-pixel unit structure, that is, each pixel unit includes a transparent sub-pixel unit ( ⁇ ), a magenta sub-pixel unit ( ⁇ ), and a yellow sub-pixel unit ( ⁇ ).
- the backlight uses a white backlight and a cyan backlight (C).
- the pixel unit uses a CMT sub-pixel unit structure while alternately using white backlight and yellow Backlight (Y).
- the pixel unit uses a CTY sub-pixel cell structure while alternately using a white backlight and a magenta backlight ( ⁇ ).
- Embodiment 2 is a diagrammatic representation of Embodiment 1:
- the pixel 112 in this embodiment includes two sub-pixel units arranged in parallel, which are a magenta sub-pixel unit ( ⁇ ) and a cyan sub-pixel unit (C), respectively.
- the backlight module 170 in this embodiment includes a yellow backlight ( ⁇ ) and a blue backlight ( ⁇ ).
- the yellow backlight displays a red (R) image through the magenta sub-pixel unit ( ⁇ ) and a green (G) image through the cyan sub-pixel unit (C).
- the blue backlight passes through the magenta sub-pixel unit ( ⁇ ) and the cyan sub-pixel unit (C), and a blue image is displayed.
- the image analyzing unit 140 in the present embodiment is for decomposing each frame of image into first image data and second image data.
- the first portion of the data driving signal is provided to the plurality of sub-pixel units in the pixel 112 to display the first image data;
- the blue backlight ( ⁇ ) emits light,
- a second portion of the data drive signal is provided to a plurality of sub-pixel units in pixel 112 to display second image data.
- the first image data includes red image data and green image data
- the second image data includes blue image data.
- first image data and the second image data in this embodiment do not include black image data.
- Fig. 6 is a timing chart showing the correlation of the field sequential liquid crystal display device of the present embodiment.
- the matching form of the polarity inversion control signal POL and the color field sequence signal FS is the same as that of the first embodiment, and will not be described again.
- the polarity inversion control signal POL is at a high level, and the data voltages of the magenta sub-pixel unit (M) and the cyan sub-pixel unit (C) are both positive.
- the color field sequence signal FS is at a high level, and the yellow backlight (Y) in the backlight module 170 emits light.
- the data driving unit 130 drives the plurality of sub-pixel units in the pixel 112 to display the first image data with a positive data voltage according to the first portion of the data driving signal.
- the first image data includes red image data and green image data. Specifically, the yellow backlight passes through the magenta sub-pixel unit (M) to display red image data. And, the yellow backlight passes through the cyan sub-pixel unit (C) to display green image data.
- the polarity inversion control signal POL is still at the high level. Therefore, the data voltages of the magenta sub-pixel unit (M) and the cyan sub-pixel unit (C) are both positive.
- Color field sequence signal FS Low level the blue backlight (B) in the backlight module 170 emits light.
- the data driving unit 130 drives the plurality of sub-pixel units in the pixel 112 according to the second portion of the data driving signal to display the second image data with a positive data voltage.
- the second image data includes blue image data. Specifically, the blue backlight transmits blue image data through both the magenta sub-pixel unit (M) and the cyan sub-pixel unit (C).
- the display panel 110 can display red, green, and blue pictures. Due to the visual persistence characteristics of the human eye, the user can view the color display.
- the polarity inversion control signal POL is at a low level, and the data voltages of the magenta sub-pixel unit (M) and the cyan sub-pixel unit (C) are both negative. .
- the color field sequence signal FS is high, and the yellow backlight (Y) in the backlight module 170 emits light.
- the data driving unit 130 drives the plurality of sub-pixel units in the pixel 112 to display the first image data with a negative data voltage according to the first portion of the data driving signal.
- the display form of the first image data is the same as that in the first color field of the Nth frame, and details are not described herein.
- the polarity inversion control signal POL is still at the low level. Therefore, the data voltages of the red sub-pixel unit (M) and the cyan sub-pixel unit (C) are both negative.
- the color field sequence signal FS is low, and the blue backlight (B) in the backlight module 170 emits light.
- the data driving unit 130 drives the plurality of sub-pixel units in the pixel 112 according to the second portion of the data driving signal to display the second color field data with a negative data voltage.
- the display form of the second color field data is the same as that in the second color field of the N+1th frame, and will not be described again.
- the display panel 110 can display red, green, and blue pictures. Due to the visual persistence feature of the human eye, the user can view the color display.
- the Nth frame and the N+1th frame constitute one driving period of the polarity inversion control signal POL.
- the polarity inversion control signal POL in the Nth frame and the N+1th frame is inverted, so that the data voltage polarities of the plurality of sub-pixel units in the pixel 112 are inverted. Also, in the two color fields of each frame, the data voltages of the sub-pixel units are the same. Thus, a polarity inversion method of "two color field one inversion" is formed.
- the data voltage waveform of each sub-pixel unit is symmetrical with respect to the common reference voltage, and the positive voltage of the data voltage applied across the liquid crystal It has the same absolute value as the negative voltage, so as to eliminate the afterimage.
- step S701 the color field sequence signal FS is provided such that the backlight module 170 respectively generates a plurality of color fields in one frame period.
- the backlight module 170 provides two color fields of a yellow color field and a blue color field in one frame period.
- step S702 in the case where the respective color fields are respectively valid, a data driving signal is supplied to the magenta sub-pixel unit (M) and the cyan sub-pixel unit (C) of the pixel 112 to open the color field.
- Corresponding sub-pixel unit periodically inverting the polarity of the data driving signal such that its voltage waveform is symmetric with respect to a common reference voltage.
- the driving method of this embodiment can realize the inverted form of "two color field-inversion".
- the data voltage polarity of the sub-pixel unit is the same, and each color field of the adjacent frame is used.
- the data voltage polarity of the sub-pixel unit is inverted.
- the absolute values of the positive and negative voltages of the data voltage applied across the liquid crystal are the same, thereby eliminating the residual image.
- a pixel unit uses a MY sub-pixel cell structure while alternately using a cyan backlight and a red backlight; or a pixel unit uses a CY sub-pixel unit structure while alternately using a magenta backlight and a green backlight.
- the pixels in the liquid crystal panel of the FSC-LCD in the prior art usually do not include sub-pixels for color filter, but provide color fields of red, green, and blue respectively through the backlight module, and display red, green, and blue colors by using time series. Three-color image information.
- a driving method is provided in this embodiment to eliminate afterimages.
- Fig. 8 is a view showing the reverse driving mode of the FSC-LCD according to the present embodiment.
- the color field sequence signal causes the backlight module to produce color fields of red, green, and blue in one frame period.
- the data voltages of the pixels are the same.
- the data voltages of the pixels are opposite in polarity.
- Vcom is the reference voltage.
- the signal voltage Vd on the pixel electrode is larger than the voltage Vcom of the COM electrode, so the pixel voltage applied across the liquid crystal is positive.
- the signal voltage Vd on the pixel electrode is still greater than the voltage Vcom of the COM electrode, so the pixel voltage applied across the liquid crystal is still positive.
- the pixel voltage applied across the liquid crystal remains positive.
- the pixel voltage applied to both ends of the liquid crystal Both maintain negative polarity.
- the data voltage waveform of each sub-pixel unit is symmetrical with respect to the common reference voltage, and the afterimage can be eliminated.
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Abstract
一种场序液晶显示驱动方法和装置。该方法包括:提供一色场序列信号,使得背光模组在一个帧周期中分别产生多个色场;在各个色场分别有效的情况下,向一像素的各亚像素单元提供数据驱动信号,以打开与该色场相对应的亚像素单元;其中,将该数据驱动信号的极性进行周期性地反转,使得其电压波形相对于公共参考电压为对称的。
Description
—种场序液晶显示驱动雄及显示装置 相关申请的交叉引用
本申请要求享有 2014年 5月 8日提交的名称为 "一种场序液晶显示驱动方法及显示 装置"的中国专利申请 CN201410193038. 5的优先权, 其全部内容通过引用并入本文中。
¾ ^领域 本发明涉及显示技术领域, 具体地说, 涉及一种场序液晶显示驱动方法及显示装 置。
背景技术
现有技术中, 场序液晶显示器 (Field Sequential Color LCD, FSC-LCD) 不需要使用 彩色滤光片, 通过背光模组分别提供红、 绿、 蓝三色的色场利用时序显示红、 绿、 蓝三 色图像信息, 从而通过时间混色的方法, 利用人眼视觉暂留特性在视网膜上显示彩色图 像。 因此, FSC-LCD具有光效率高、 分辨率高且成本低的优点, 成为 LCD发展的主要趋 势。 通常, 若使液晶分子长期工作在某一固定电压下, 会导致液晶分子的特性发生固 化。 当取消这一固定电压后, 液晶分子将无法响应外加电压的变化。 因此, LCD 的液晶 驱动方式通常为交流驱动。
就 FSC-LCD而言, 通常采用 "一色场一反转"的反转方式, 即在红、 绿、 蓝三色的 色场中分别使液晶两端的数据电压极性发生反转。 但是, 在显示奇数场和偶数场图像 时, 加在液晶两端的数据电压的正电压和负电压的绝对值存在差异。 这导致液晶分子处 于直流偏置驱动状态, 若长时间显示静态画面, 将会使得液晶过度极化, 失去旋转能 力, 在显示其他画面时, 液晶将不能正常旋转, 从而形成残像。
因此, 亟需一种能够消除残像的 FSC-LCD场序液晶显示装置及其驱动方法。
发明内容
本发明针对现有技术中存在的上述问题, 提供了一种能够消除残像的场序液晶显示 驱动方法, 所述方法包括以下步骤:
提供一色场序列信号, 使得背光模组在一个帧周期中分别产生多个色场; 在各个色场分别有效的情况下, 向一像素的各亚像素单元提供数据驱动信号, 以打 开与所述色场相对应的亚像素单元;
其中, 将所述数据驱动信号的极性进行周期性地反转, 使得其电压波形相对于公共 参考电压为对称的。
根据本发明的一个实施例, 在一个帧周期中产生两个色场, 在第一色场有效时, 向 一个像素的各亚像素单元提供所述数据驱动信号的第一部分, 以打开所述各个亚像素单 元中的每一个从而使所述第一色场的光从中透过;
在第二色场有效时, 向一个像素中的各亚像素单元提供所述数据驱动信号的第二部 分, 以打开所述各个亚像素单元中的一个或每一个, 从而使所述第二色场的光从所打开 的亚像素单元透过;
其中, 所述数据驱动信号的第一部分和第二部分极性相同。
根据本发明的一个实施例, 第一色场有效的时间与所述第二色场有效的时间相同。 根据本发明的一个实施例, 将所述数据驱动信号的极性进行反转的周期与帧周期呈 倍数关系。
根据本发明的一个实施例, 将所述数据驱动信号的极性进行反转的周期与帧周期相 同。
根据本发明的一个实施例, 由极性反转控制信号控制所述数据驱动信号的极性进行 周期性地反转。
根据本发明的一个实施例, 所述亚像素单元中至少一个亚像素单元为透明亚像素单 元。
根据本发明的一个实施例, 所述亚像素单元包括品红色亚像素单元、 青色亚像素单 元和黄色亚像素单元中的两个; 或者
所述亚像素单元包括红色亚像素单元、 绿亚像素单元和蓝色亚像素单元中的两个。 根据本发明的一个实施例, 在所述第一色场下, 所述背光模组发出白色光, 并且在
所述第二色场下, 所述背光模组发出红色光、 蓝色光或者绿色光中的一种; 或者 在所述第一色场下, 所述背光模组发出品红色光、 青色光或者黄色光中的一种, 并 且在所述第二色场下, 所述背光模组发出红色光、 蓝色光或者绿色光中的一种。
根据本发明的另一方面, 还提供一种液晶显示装置, 包括:
时序控制单元,用于提供一色场序列信号,使得背光模组在一个帧周期中分别产生多 个色场;
数据驱动单元,用于在各个色场分别有效的情况下, 向一像素的各亚像素单元提供数 据驱动信号, 以打开与所述色场相对应的亚像素单元;
其中, 所述时序控制单元还提供一极性反转控制信号, 将所述数据驱动信号的极性 进行周期性地反转, 使得其电压波形相对于公共参考电压为对称的。
根据本发明的一个实施例,所述背光模组在一个帧周期中产生两个色场,在第一色场 有效时, 所述数据驱动单元向一个像素的各亚像素单元提供所述数据驱动信号的第一部 分, 以打开所述各个亚像素单元中的每一个从而使所述第一色场的光从中透过;
在第二色场有效时,所述数据驱动单元向一个像素中的各亚像素单元提供所述数据驱 动信号的第二部分, 以打开所述各个亚像素单元中的一个或每一个,从而使所述第二色场 的光从所打开的亚像素单元透过;
其中, 所述数据驱动信号的第一部分和第二部分极性相同。
根据本发明的一个实施例, 所述背光模组产生的第一色场有效的时间与第二色场有 效的时间相同。
根据本发明的一个实施例, 所述极性反转控制信号将数据驱动信号的极性进行反转 的周期与帧周期呈倍数关系。
根据本发明的一个实施例, 所述极性反转控制信号将数据驱动信号的极性进行反转 的周期与帧周期相同。
根据本发明的一个实施例, 所述亚像素单元中至少一个亚像素单元为透明亚像素单 元。
根据本发明的一个实施例,所述亚像素单元包括品红色亚像素单元、青色亚像素单元 和黄色亚像素单元中的两个; 或者
所述亚像素单元包括红色亚像素单元、 绿亚像素单元和蓝色亚像素单元中的两个。 本发明的驱动方法可实现 "两色场一反转" 的反转形式, 在每一帧的多个色场中,
亚像素单元的数据电压极性相同, 在相邻帧的色场中各个亚像素单元的数据电压极性发 生反转。 使得加在液晶两端的数据电压的正电压和负电压的绝对值相同, 从而可消除残 像。 本发明的其它特征和优点将在随后的说明书中阐述, 并且, 部分地从说明书中变得 显而易见, 或者通过实施本发明而了解。 本发明的目的和其他优点可通过在说明书、 权 利要求书以及附图中所特别指出的结构来实现和获得。
附图说明
附图用来提供对本发明的进一步理解, 并且构成说明书的一部分, 与本发明的实施 例共同用于解释本发明, 并不构成对本发明的限制。 在附图中:
图 1是根据本发明实施例一的场序液晶显示装置结构示意图;
图 2是根据本发明实施例一的像素单元的结构示意图;
图 2是根据本发明实施例一的场序液晶显示装置的相关信号时序图;
图 4是根据本发明实施例一的场序液晶显示装置的驱动方法流程图;
图 5是根据本发明实施例二的像素单元的结构示意图;
图 6是根据本发明实施例二的场序液晶显示装置的相关信号时序图;
图 7是根据本发明实施例二的场序液晶显示装置的驱动方法流程图;
图 8是根据本发明实施例三的 FSC-LCD的反转驱动方式示意图。
具体实施方式
为使本发明的目的、 技术方案和优点更加清楚, 以下结合附图对本发明作进一步地 详细说明。
实施例一:
图 1 为根据本实施例的场序液晶显示装置的结构示意图。 如图 1所示, 液晶显示装 置 100 包括显示面板 110、 扫描驱动单元 120、 数据驱动单元 130, 以及图像分析单元 140、 时序控制单元 150、 主控单元 160和背光模组 170。 背光模组 170设置于显示面板
110的后部, 为显示面板 110提供光源。 显示面板 110包括以矩阵形式排列的多个像素 112, 每一像素 112包括多个亚像素单元。 此外, 本实施例中的背光模组 170包括白光背 光源 (W)和红光背光源 (R) , 图 1未示出。
扫描驱动单元 120与数据驱动单元 130分别电连接至显示面板 110。 时序控制单元 150电连接至扫描驱动单元 120和数据驱动单元 130, 用以控制扫描驱动单元 120扫描显 示面板 110, 并通过主控单元 160控制数据驱动单元 130驱动显示面板 110以显示图像。
图像分析单元 140电连接至时序控制单元 150, 用于将每帧图像分解为第一图像数据 和第二图像数据。 在本实施例中, 在白光背光源(W)发光时, 向像素 112中多个亚像素 单元提供数据驱动信号的第一部分, 以显示第一图像数据; 在红光背光源(R)发光时, 向像素 112中多个亚像素单元提供数据驱动信号的第二部分, 以显示第二图像数据。
时序控制单元 150可产生周期性的极性反转控制信号 POL, 用于使液晶显示面板中 亚像素单元数据电压的极性发生反转。 在本实施例中, 背光模组 170在每个帧周期中产 生两个色场。 在同一帧周期中, 像素 112 中多个亚像素单元的数据驱动信号的第一部分 和第二部分的数据电压相同。 在相邻帧周期中, 各个亚像素单元数据电压的极性发生一 次反转。
主控单元 160电连接背光模组 170, 控制白光背光源 (W)和红光背光源 (R) 交替 发光。 背光模组 170可根据来自主控单元 160的色场序列信号 FS, 与数据驱动信号的第 一部分同步地发出白色(W)光, 或者, 与数据驱动信号的第二部分同步地发出红色(R) 光。
图 2为本实施例中像素单元的结构示意图。 如图 2所示, 像素 112包括平行排布的三 个亚像素单元, 分别为透明亚像素单元 (T) 、 绿色亚像素单元 (G)和蓝色亚像素单元 (B)。 其中, 透明亚像素单元(T)可透射全部波长的光, 绿色亚像素单元(G)可透射 绿色波长的光, 蓝色亚像素单元(B)可透射蓝色波长的光。 在扫描驱动单元 120的控制 下, 选通线 Gl、 G2以扫描的方式依次选通每行像素单元, 使得透明亚像素单元(T) 、 绿色亚像素单元(G)和蓝色亚像素单元 (B) 分别从数据线 Dl、 D2、 D3接收来自数据 驱动单元 130的数据电压。
图 3是本实施例中场序液晶显示装置的相关信号时序图。 极性反转控制信号 POL以 两个帧周期为一个驱动周期, 背光模组 170在每一帧周期中分别形成第一色场和第二色 场。 在所述驱动周期的第 N帧和第 N+1帧中, 所述亚像素单元的数据电压极性相反, 使
得亚像素单元的数据驱动信号的极性进行反转的周期与帧周期相同。 即, 每经过一个帧 周期, 亚像素单元的数据驱动信号的极性反转一次。
需要说明的是, 数据驱动信号的极性进行反转的周期可以为帧周期的整数倍。
当极性反转控制信号 POL为高电平信号时, 各个亚像素单元数据电压为正极性, 即 电压值高于公共电极电压。 当极性反转控制信号 POL为低电平信号时, 各个亚像素单元 数据电压信号为负极性, 即电压值低于公共电极电压。 从而, 在极性反转控制信号 POL 的控制下, 液晶显示面板中亚像素单元数据电压的极性发生周期性反转, 使得其电压波 形相对于公共参考电压为对称的。 在第 N帧中, 亚像素单元数据电压的极性为正极性。 在第 N+1帧中, 亚像素单元数据电压的极性为负极性。
如图 3所示, 本实施例提供的色场序列信号 FS为周期性的方波信号, 以一个帧周期 为一个驱动周期。 当色场序列信号 FS为高电平时, 背光模组 170产生白光色场; 当色场 序列信号 FS为低电平时, 背光模组 170产生红光色场。 在本实施例中, 白光色场和红光 色场的有效时间相同。 也就是说, 背光模组 170中的白光背光源(W)和红光背光源(R) 发光时间相同。
进一步而言, 如图 3 所示, 在同一帧的第一色场和第二色场中, 各个亚像素单元的 数据电压极性相同; 在相邻帧的第一色场和第二色场中, 各个亚像素单元的数据电压极 性相反。
具体的, 当色场序列信号 FS为高电平时, 背光模组 170中的白光背光源 (W)发光, 从而白光色场有效, 并且, 数据驱动单元 130根据数据驱动信号的第一部分驱动像素 112 中的多个亚像素单元显示第一图像数据。 当色场序列信号 FS为低电平时, 背光模组 170 中的红光背光源(R)发光, 从而红色光场有效, 并且, 数据驱动单元 130根据数据驱动 信号的第二部分驱动像素 112中的多个亚像素单元显示第二图像数据。
因此, 在同一帧的两个色场中, 各个亚像素单元的数据电压极性不发生反转。 并 且, 在相邻帧的色场中, 各个亚像素单元的数据电压极性发生反转。 从而形成 "两色场 一反转" 的极性反转方式, 使得其各个亚像素单元的数据电压波形相对于公共参考电压 为对称的, 加在液晶两端的数据电压的正电压和负电压的绝对值相同, 达到消除残像的 目的。
下面以在不同帧中, 像素 112中各个亚像素单元的数据电压的极性为例进行说明。
在第 N帧的第一色场中, 极性反转控制信号 POL为高电平, 透明亚像素单元(T)、 绿色亚像素单元(G)和蓝色亚像素单元(Β) 的数据电压均为正极性。 色场序列信号 FS 为高电平, 背光模组 170中的白光背光源(W)发光。 数据驱动单元 130根据数据驱动信 号的第一部分驱动像素 112 中的多个亚像素单元以正极性的数据电压显示第一图像数 据。 其中, 第一图像数据包括白色图像数据、 绿色图像数据和蓝色图像数据。 具体而 言, 白色背光透过透明亚像素单元(Τ) , 以显示白色图像数据。 并且, 白色背光透过绿 色亚像素单元(G), 以显示绿色图像数据。 以及, 白色背光透过蓝色亚像素单元(B), 以显示蓝色图像数据。
接下来, 在第 N帧的第二色场中, 极性反转控制信号 POL仍为高电平。 因此, 透明 亚像素单元(T)、 绿色亚像素单元(G)和蓝色亚像素单元(B)的数据电压均为正极性。 色场序列信号 FS为低电平, 背光模组 170中的红光背光源(R)发光。 数据驱动单元 130 根据数据驱动信号的第二部分驱动像素 112 中的多个亚像素单元以正极性的数据电压显 示第二图像数据。 其中, 第二图像数据包括红色图像数据和黑色图像数据。 具体而言, 红色背光透过透明亚像素单元(T), 以显示红色图像数据。 并且, 绿色亚像素单元(G) 和蓝色亚像素单元 (B)均显示黑色图像数据。
从而在第 N帧中, 显示面板 110可显示出白色、 绿色、 蓝色和红色画面。 由于人眼 的视觉暂留特性, 用户可观看彩色显示画面。
进一步, 在第 N+1帧的第一色场中, 极性反转控制信号 POL为低电平, 透明亚像素 单元(T)、 绿色亚像素单元(G)和蓝色亚像素单元(B)的数据电压均为负极性。 色场 序列信号 FS为高电平, 背光模组 170中的白光背光源(W)发光。 数据驱动单元 130根 据数据驱动信号的第一部分驱动像素 112 中的多个亚像素单元以负极性的数据电压显示 第一图像数据。 其中, 第一图像数据的显示形式与上述第 N帧的第一色场中的形式相 同, 不再赘述。
接下来, 在第 N+1帧的第二色场中, 极性反转控制信号 POL仍为低电平。 因此, 透 明亚像素单元(T)、 绿色亚像素单元(G)和蓝色亚像素单元(B)的数据电压均为负极 性。 色场序列信号 FS为低电平, 背光模组 170中的红光背光源 (R)发光。 数据驱动单 元 130根据数据驱动信号的第二部分驱动像素 112中的多个亚像素单元以负极性的数据 电压显示第二图像数据。 其中, 第二图像数据的显示形式与上述第 N+1帧的第二色场中 的形式相同, 不再赘述。
从而在第 N+1帧中, 显示面板 110可显示出白色、 绿色、 蓝色和红色画面。 由于人 眼的视觉暂留特性, 用户可观看彩色显示画面。
综上所述, 第 N帧和第 N+1帧构成极性反转控制信号 POL的一个驱动周期。 其中第 N帧和第 N+1帧中的极性反转控制信号 POL发生反转, 使得像素 112中的多个亚像素单 元的数据电压极性发生反转。 在每个帧周期中产生两个色场。 并且, 在每一帧的两色场 中, 亚像素单元的数据电压极性相同。 从而形成 "两色场一反转"的极性反转方式。
图 4是根据实施例的场序液晶显示装置的驱动方法流程图。 以下结合图 4对本实施 例的驱动方法做详细说明。
首先, 在步骤 S401中, 提供色场序列信号 FS, 使得背光模组 170在一个帧周期中分 别产生多个色场。 在本实施例中, 在一个帧周期中, 背光模组 170提供白光色场和红光 色场两个色场。
然后, 在步骤 S402中, 在各个色场分别有效的情况下, 向像素 112的各亚像素单元 提供数据驱动信号, 以打开与所述色场相对应的亚像素单元; 将所述数据驱动信号的极 性进行周期性地反转, 使得其电压波形相对于公共参考电压为对称的。 具体的, 本实施 例中的像素 112包括透明亚像素单元(T)、 绿色亚像素单元(G)和蓝色亚像素单元(Β)。 详细驱动过程已在上文中说明, 不再赘述。
本实施例的驱动方法使显示面板 110显示出红色、 绿色和蓝色画面。 由于人眼的视 觉暂留特性, 用户可观看彩色显示画面。 同时, 本实施例的驱动方法可实现 "两色场一 反转" 的反转形式, 在每一帧的两色场中, 亚像素单元的数据电压极性相同, 在相邻帧 的色场中各个亚像素单元的数据电压极性发生反转。 使得加在液晶两端的数据电压的正 电压和负电压的绝对值相同, 从而可消除残像。
本领域技术人员可以理解, 本实施例中像素单元的 TGB亚像素单元结构以及白色背 光和红色背光的组合方式也可由其他类似的实施方式。 例如, 像素单元使用 RTB亚像素 单元结构, 同时交替使用白色背光和绿色背光; 或者像素单元使用 RGT结构, 同时交替 使用白色背光和蓝色背光。
再比如, 像素单元使用 ΤΜΥ亚像素单元结构, 即每一像素单元包括透明亚像素单元 (Τ) 、 品红色亚像素单元 (Μ) 和黄色亚像素单元 (Υ) 。 背光源使用白色背光和青色 背光 (C) 。 或者, 像素单元使用 CMT亚像素单元结构, 同时交替使用白色背光和黄色
背光 (Y) 。 或者, 像素单元使用 CTY亚像素单元结构, 同时交替使用白色背光和品红 色背光 (Μ) 。
实施例二:
本实施例与实施例一基本相同。 其不同点在于, 如图 5 所示, 本实施例中像素 112 包括平行排布的两个亚像素单元, 分别为品红色亚像素单元 (Μ ) 和青色亚像素单元 (C) 。 并且, 本实施例中的背光模组 170包括黄光背光源 (Υ)和蓝光背光源 (Β) 。
其中, 黄色背光透过品红色亚像素单元(Μ)显示红色 (R) 图像, 透过青色亚像素 单元 (C) 显示绿色 (G) 图像。 蓝色背光透过品红色亚像素单元 (Μ)和青色亚像素单 元 (C)之后, 显示蓝色图像。
因而, 本实施例中的图像分析单元 140用于将每帧图像分解为第一图像数据和第二 图像数据。 在本实施例中, 在黄光背光源(Υ)发光时, 向像素 112中多个亚像素单元提 供数据驱动信号的第一部分, 以显示第一图像数据; 在蓝光背光源(Β)发光时, 向像素 112 中多个亚像素单元提供数据驱动信号的第二部分, 以显示第二图像数据。 其中, 第 一图像数据包括红色图像数据和绿色图像数据, 第二图像数据包括蓝色图像数据。
需要说明的是, 本实施例中的第一图像数据和第二图像数据均不包括黑色图像数 据。
图 6是本实施例中场序液晶显示装置的相关信号时序图。 极性反转控制信号 POL和 色场序列信号 FS的配合形式与实施例一相同, 不再赘述。
在第 N帧的第一色场中, 极性反转控制信号 POL为高电平, 品红色亚像素单元 (M) 和青色亚像素单元 (C) 的数据电压均为正极性。 色场序列信号 FS为高电平, 背光模组 170中的黄光背光源 (Y) 发光。 数据驱动单元 130根据数据驱动信号的第一部分驱动像 素 112 中的多个亚像素单元以正极性的数据电压显示第一图像数据。 其中, 第一图像数 据包括红色图像数据和绿色图像数据。 具体而言, 黄色背光透过品红色亚像素单元 (M) , 以显示红色图像数据。 并且, 黄色背光透过青色亚像素单元(C) , 以显示绿色 图像数据。
接下来, 在第 N帧的第二色场中, 极性反转控制信号 POL仍为高电平。 因此, 品红 色亚像素单元 (M) 和青色亚像素单元 (C) 的数据电压均为正极性。 色场序列信号 FS
为低电平, 背光模组 170中的蓝光背光源(B)发光。 数据驱动单元 130根据数据驱动信 号的第二部分驱动像素 112 中的多个亚像素单元以正极性的数据电压显示第二图像数 据。 其中, 第二图像数据包括蓝色图像数据。 具体而言, 蓝色背光透过品红色亚像素单 元 (M)和青色亚像素单元 (C) , 均显示蓝色图像数据。
从而在第 N帧中, 显示面板 110可显示出红色、 绿色和蓝色画面。 由于人眼的视觉 暂留特性, 用户可观看彩色显示画面。
进一步, 在第 N+1帧的第一色场中, 极性反转控制信号 POL为低电平, 品红色亚像 素单元 (M)和青色亚像素单元 (C) 的数据电压均为负极性。 色场序列信号 FS为高电 平, 背光模组 170中的黄光背光源(Y)发光。 数据驱动单元 130根据数据驱动信号的第 一部分驱动像素 112 中的多个亚像素单元以负极性的数据电压显示第一图像数据。 其 中, 第一图像数据的显示形式与上述第 N帧的第一色场中的形式相同, 不再赘述。
接下来, 在第 N+1帧的第二色场中, 极性反转控制信号 POL仍为低电平。 因此, 红 色亚像素单元 (M) 和青色亚像素单元 (C) 的数据电压均为负极性。 色场序列信号 FS 为低电平, 背光模组 170中的蓝光背光源(B)发光。 数据驱动单元 130根据数据驱动信 号的第二部分驱动像素 112 中的多个亚像素单元以负极性的数据电压显示第二色场数 据。 其中, 第二色场数据的显示形式与上述第 N+1帧的第二色场中的形式相同, 不再赘 述。
从而在第 N+1帧中, 显示面板 110可显示出红色、 绿色和蓝色画面。 由于人眼的视 觉暂留特性, 用户可观看彩色显示画面。
综上所述, 第 N帧和第 N+1帧构成极性反转控制信号 POL的一个驱动周期。 其中第 N帧和第 N+1帧中的极性反转控制信号 POL发生反转, 使得像素 112中的多个亚像素单 元的数据电压极性发生反转。 并且, 在每一帧的两色场中, 亚像素单元的数据电压极性 相同。 从而形成 "两色场一反转" 的极性反转方式。 通过在相邻帧的色场中各个亚像素 单元的数据电压极性发生反转, 使得各个亚像素单元的数据电压波形相对于公共参考电 压为对称的, 加在液晶两端的数据电压的正电压和负电压的绝对值相同, 从而达到消除 残像的目的。
图 7是根据实施例的场序液晶显示装置的驱动方法流程图。 以下结合图 7对本实施 例的驱动方法做详细说明。
首先, 在步骤 S701中, 提供色场序列信号 FS, 使得背光模组 170在一个帧周期中分 别产生多个色场。 在本实施例中, 在一个帧周期中, 背光模组 170提供黄光色场和蓝光 色场两个色场。
然后, 在步骤 S702中, 在各个色场分别有效的情况下, 向像素 112的品红色亚像素 单元(M)和青色亚像素单元(C)提供数据驱动信号, 以打开与所述色场相对应的亚像 素单元; 将所述数据驱动信号的极性进行周期性地反转, 使得其电压波形相对于公共参 考电压为对称的。 具体的驱动过程已在上文中说明, 不再赘述。
本实施例的驱动方法可实现 "两色场一反转"的反转形式, 在每一帧的两色场中, 亚像素单元的数据电压极性相同, 在相邻帧的色场中各个亚像素单元的数据电压极性发 生反转。 使得加在液晶两端的数据电压的正电压和负电压的绝对值相同, 从而可消除残 像。
本领域技术人员可以理解, 本实施例中像素单元的 MC亚像素单元结构以及黄色背 光和蓝色背光的组合方式也可由其他类似的实施方式。 例如, 像素单元使用 MY亚像素 单元结构, 同时交替使用青色背光和红色背光; 或者像素单元使用 CY亚像素单元结 构, 同时交替使用品红色背光和绿色背光。
实施例三
现有技术中的 FSC-LCD的液晶面板中的像素通常不包括滤色用的亚像素, 而是通过 背光模组分别提供红、 绿、 蓝三色的色场利用时序显示红、 绿、 蓝三色图像信息。 本实 施例中提供一种驱动方法可消除残像。
图 8是根据本实施例的 FSC-LCD的反转驱动方式示意图。 色场序列信号使得背光模 组在一个帧周期中产生红、 绿、 蓝三色的色场。 在同一帧周期的三个色场中, 像素的数 据电压极性相同。 在相邻帧周期的三个色场中, 像素的数据电压极性相反。
请参考图 8, 其中的 Vcom为基准电压。 在第 N帧的 R色场中, 像素电极上的信号 电压 Vd大于 COM电极的电压 Vcom, 因此加在液晶两端的像素电压为正极性。 在随后 的 G色场中, 像素电极上的信号电压 Vd仍大于 COM电极的电压 Vcom, 因此加在液晶 两端的像素电压仍为正极性。 类似的, 在随后的 B色场中, 加在液晶两端的像素电压保 持正极性。 随后, 在第 N+1帧的 R色场、 G色场和 B色场中, 加在液晶两端的像素电压
均保持负极性。
因此, 各个亚像素单元的数据电压波形相对于公共参考电压为对称的, 可以消除残 像。
虽然本发明所公开的实施方式如上, 但所述的内容只是为了便于理解本发明而采用 的实施方式, 并非用以限定本发明。 任何本发明所属技术领域内的技术人员, 在不脱离 本发明所揭露的精神和范围的前提下, 可以在实施的形式上及细节上作任何的修改与变 化, 但本发明的专利保护范围, 仍须以所附的权利要求书所界定的范围为准。
Claims
1、 一种场序液晶显示驱动方法, 包括以下步骤:
提供一色场序列信号, 使得背光模组在一个帧周期中分别产生多个色场; 在各个色场分别有效的情况下, 向一像素的各亚像素单元提供数据驱动信号, 以打开 与所述色场相对应的亚像素单元;
其中,将所述数据驱动信号的极性进行周期性地反转,使得其电压波形相对于公共参 考电压为对称的。
2、 如权利要求 1所述的驱动方法, 其中, 在一个帧周期中产生两个色场, 在第一色 场有效时, 向一个像素的各亚像素单元提供所述数据驱动信号的第一部分, 以打开所述各 个亚像素单元中的每一个从而使所述第一色场的光从中透过;
在第二色场有效时, 向一个像素中的各亚像素单元提供所述数据驱动信号的第二部 分,以打开所述各个亚像素单元中的一个或每一个,从而使所述第二色场的光从所打开的 亚像素单元透过;
其中, 所述数据驱动信号的第一部分和第二部分极性相同。
3、 如权利要求 2所述的驱动方法, 其中, 第一色场有效的时间与所述第二色场有效 的时间相同。
4、 如权利要求 3所述的驱动方法, 其中,
在所述第一色场下,所述背光模组发出白色光, 并且在所述第二色场下,所述背光模 组发出红色光、 蓝色光或者绿色光中的一种; 或者
在所述第一色场下,所述背光模组发出品红色光、青色光或者黄色光中的一种, 并且 在所述第二色场下, 所述背光模组发出红色光、 蓝色光或者绿色光中的一种。
5、 如权利要求 2所述的驱动方法, 其中, 将所述数据驱动信号的极性进行反转的周 期与帧周期呈倍数关系。
6、 如权利要求 5所述的驱动方法, 其中,
在所述第一色场下,所述背光模组发出白色光, 并且在所述第二色场下,所述背光模 组发出红色光、 蓝色光或者绿色光中的一种; 或者
在所述第一色场下,所述背光模组发出品红色光、青色光或者黄色光中的一种, 并且 在所述第二色场下, 所述背光模组发出红色光、 蓝色光或者绿色光中的一种。
7、 如权利要求 5所述的驱动方法, 其中, 将所述数据驱动信号的极性进行反转的周 期与帧周期相同。
8、 如权利要求 7所述的驱动方法, 其中,
在所述第一色场下,所述背光模组发出白色光, 并且在所述第二色场下,所述背光模 组发出红色光、 蓝色光或者绿色光中的一种; 或者
在所述第一色场下,所述背光模组发出品红色光、青色光或者黄色光中的一种, 并且 在所述第二色场下, 所述背光模组发出红色光、 蓝色光或者绿色光中的一种。
9、 如权利要求 7所述的驱动方法, 其中, 由极性反转控制信号控制所述数据驱动信 号的极性进行周期性地反转。
10、 如权利要求 9所述的驱动方法, 其中,
在所述第一色场下,所述背光模组发出白色光, 并且在所述第二色场下,所述背光模 组发出红色光、 蓝色光或者绿色光中的一种; 或者
在所述第一色场下,所述背光模组发出品红色光、青色光或者黄色光中的一种, 并且 在所述第二色场下, 所述背光模组发出红色光、 蓝色光或者绿色光中的一种。
11、 如权利要求 2所述的驱动方法, 其中,
在所述第一色场下,所述背光模组发出白色光, 并且在所述第二色场下,所述背光模 组发出红色光、 蓝色光或者绿色光中的一种; 或者
在所述第一色场下,所述背光模组发出品红色光、青色光或者黄色光中的一种, 并且 在所述第二色场下, 所述背光模组发出红色光、 蓝色光或者绿色光中的一种。
12、如权利要求 1所述的驱动方法,其中,所述亚像素单元中至少一个亚像素单元为 透明亚像素单元。
13、 如权利要求 1所述的驱动方法, 其中, 所述亚像素单元包括品红色亚像素单元、 青色亚像素单元和黄色亚像素单元中的两个; 或者
所述亚像素单元包括红色亚像素单元、 绿亚像素单元和蓝色亚像素单元中的两个。
14、 一种液晶显示装置, 包括:
时序控制单元,用于提供一色场序列信号,使得背光模组在一个帧周期中分别产生多 个色场;
数据驱动单元,用于在各个色场分别有效的情况下, 向一像素的各亚像素单元提供数 据驱动信号, 以打开与所述色场相对应的亚像素单元;
其中,所述时序控制单元还提供一极性反转控制信号,将所述数据驱动信号的极性进 行周期性地反转, 使得其电压波形相对于公共参考电压为对称的。
15、 如权利要求 14所述的液晶显示装置, 其中,
所述背光模组在一个帧周期中产生两个色场,在第一色场有效时,所述数据驱动单元 向一个像素的各亚像素单元提供所述数据驱动信号的第一部分,以打开所述各个亚像素单
元中的每一个从而使所述第一色场的光从中透过;
在第二色场有效时,所述数据驱动单元向一个像素中的各亚像素单元提供所述数据驱 动信号的第二部分,以打开所述各个亚像素单元中的一个或每一个,从而使所述第二色场 的光从所打开的亚像素单元透过;
其中, 所述数据驱动信号的第一部分和第二部分极性相同。
16、 如权利要求 15所述的液晶显示装置, 其中, 所述背光模组产生的第一色场有效 的时间与第二色场有效的时间相同。
17、 如权利要求 15所述的液晶显示装置, 其中, 所述极性反转控制信号将数据驱动 信号的极性进行反转的周期与帧周期呈倍数关系。
18、 如权利要求 17所述的液晶显示装置, 其中, 所述极性反转控制信号将数据驱动 信号的极性进行反转的周期与帧周期相同。
19、 如权利要求 14所述的液晶显示装置, 其中, 所述亚像素单元中至少一个亚像素 单元为透明亚像素单元。
20、 如权利要求 14所述的液晶显示装置, 其中, 所述亚像素单元包括品红色亚像素 单元、 青色亚像素单元和黄色亚像素单元中的两个; 或者
所述亚像素单元包括红色亚像素单元、 绿亚像素单元和蓝色亚像素单元中的两个。
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| US14/416,845 US20160125822A1 (en) | 2014-05-08 | 2014-05-28 | Field sequential liquid crystal display device and driving method thereof |
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| CN201410193038.5A CN104036739B (zh) | 2014-05-08 | 2014-05-08 | 一种场序液晶显示驱动方法及显示装置 |
| CN201410193038.5 | 2014-05-08 |
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| CN104240213B (zh) * | 2014-09-05 | 2017-12-15 | 京东方科技集团股份有限公司 | 一种显示方法及显示装置 |
| CN104517579B (zh) * | 2014-12-31 | 2017-04-19 | 深圳市华星光电技术有限公司 | 过驱动表的调试方法 |
| CN104820315B (zh) | 2015-05-29 | 2018-06-05 | 京东方科技集团股份有限公司 | 一种场序显示面板、场序显示装置及驱动方法 |
| US10685619B2 (en) * | 2017-05-10 | 2020-06-16 | Himax Display, Inc. | Display apparatus and related driving method utilizing common voltage modulation |
| KR102699276B1 (ko) * | 2018-08-08 | 2024-08-28 | 삼성디스플레이 주식회사 | 표시 장치 및 이의 구동 방법 |
| US10971090B2 (en) * | 2018-12-27 | 2021-04-06 | Novatek Microelectronics Corp. | Method for preventing image sticking in display panel |
| CN110349549B (zh) * | 2019-07-17 | 2022-07-05 | 京东方科技集团股份有限公司 | 液晶显示面板的驱动方法、驱动电路及显示装置 |
| CN114387935A (zh) * | 2022-01-28 | 2022-04-22 | 深圳市科金明电子股份有限公司 | 一种lcd的驱动方法、控制器及介质 |
| US12272321B2 (en) * | 2022-09-21 | 2025-04-08 | Apple Inc. | Method and apparatus for LED driver to reduce cross talk or flicker |
| CN121411033B (zh) * | 2025-12-26 | 2026-04-28 | 海信视像科技股份有限公司 | 背光模组和显示设备 |
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| CN104036739B (zh) | 2016-05-25 |
| CN104036739A (zh) | 2014-09-10 |
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