CN101046944A - Liquid crystal display device, driving control circuit and driving method used in same - Google Patents

Abstract

The present invention provides a liquid crystal display device that improves the image quality of moving images. The field division driving formed by the odd fields in which the scan electrodes of the odd rows are sequentially driven and the even fields in which the scan electrodes of the even rows are sequentially driven is performed, and the odd fields and the even fields are alternately repeated according to the time range of the refresh rate. In the first half of the odd field, display data is written into each pixel region corresponding to the scan electrodes of odd rows, and in the second half of the odd field, black data is written into each pixel region corresponding to the scan electrodes of odd rows. In the first half of the even field, display data is written into each pixel region corresponding to the scan electrodes of the even rows, and in the second half of the even field, black data is written into each pixel region corresponding to the scan electrodes of the even rows.

Description

Liquid crystal display device, driving control circuit and driving method used in the liquid crystal display device

technical field

The invention relates to a liquid crystal display device, a driving control circuit and a driving method used in the liquid crystal display device, especially a liquid crystal display device suitable for displaying dynamic images, a driving control circuit and a driving method used in the liquid crystal display device.

This application claims the priority of Japanese Patent Application No. 2006-101252 filed on March 31, 2006 and No. 2006-159001 filed on June 7, 2006, which are incorporated herein by reference.

Background technique

In recent years, liquid crystal display devices have been used not only as displays for personal computers but also for various displays such as liquid crystal televisions. In the case of being used in a TV, etc., the performance of displaying moving images is required. However, in the existing liquid crystal display device, when displaying moving images, the following image is displayed when the current image remains in the user's consciousness. image, causing the user to perceive afterimages (smearing, image blurring). The reason is that it takes time for the applied voltage of the liquid crystal to generate a response, and a hold-type drive that can hold the current frame until receiving the display signal corresponding to the subsequent frame is adopted.

The smear caused by the response speed of the liquid crystal is weakened by accelerating the response of the liquid crystal by overdrive, which applies an overvoltage to the liquid crystal, or the like. In addition, the smear caused by the hold-type driving, such as CRT (Cathode Ray Tube, cathode ray tube) display device, is weakened by using pulse driving that only displays transient images. The so-called impulse driving is, for example, a black insertion driving method that displays a black screen after displaying an image on the liquid crystal panel during one frame. In addition to the black insertion driving method described above, so-called pulse driving may be a method of lighting a backlight after applying a predetermined voltage to a pixel region (backlight blinking method).

Such an existing liquid crystal display device includes: a black insertion drive control unit 1 , a source driver 2 , a gate driver 3 and a liquid crystal display panel 4 . The liquid crystal display panel 4 has multiple rows of scanning electrodes, multiple columns of data electrodes, and multiple pixel regions, which are not shown in the figure. By sequentially applying a scanning signal OUT to each scanning electrode and applying corresponding display data D to each data electrode, the Corresponding display data D is written in each pixel area, and light emitted from a backlight (not shown) is controlled according to the display data. The black insertion drive control unit 1 outputs a control signal a to the source driver 2 and outputs a control signal b to the gate driver 3 based on the input video signal VD. The source driver 2 applies a voltage (display data voltage) corresponding to the display data corresponding to the input video signal VD to each data electrode of the liquid crystal display panel 4 based on the control signal a from the black insertion drive control unit 1, and further, performs a power transfer to each data electrode of the liquid crystal display panel 4. In each frame period, a black insertion drive is uniformly inserted into a black frame whose gradation level is, for example, "0". The gate driver 3 sequentially applies the scan signal OUT to each scan electrode line of the liquid crystal display panel 4 based on the control signal b from the black insertion drive control unit 1 .

In this liquid crystal display device, as shown in FIG. 19 , the scanning electrodes (lines 1, 2, . 1] After writing to the corresponding pixel area, write black data and end one frame. Thereafter, the same operation is repeated every frame by displaying data [2], [3], [4] and black data. Therefore, as shown in FIG. 20 , when the driving frequency of the liquid crystal display panel 4 is twice the frame frequency, the frequency of the display data D, the control signal a, the control signal b, and the scanning signal OUT is different from the case where the black insertion driving is not performed. The ratio is doubled, and furthermore, the writing time to the liquid crystal panel and the storage time of the liquid crystal panel are halved compared with the case of not performing black insertion driving. Furthermore, the frequency of polarity inversion of the display data D is also doubled, so the frequency of the control signal a in FIG. 18 is also doubled.

In addition to the above-mentioned liquid crystal display devices, existing such technologies may also be those described in the following documents. For example, in the method for driving a liquid crystal display device for TV described in Japanese Patent Application Laid-Open No. 04-044478, as shown in FIG. ) in the odd fields in which the scan electrodes of odd rows are sequentially driven, and the alternate driving formed by even fields in which the scan electrodes of even rows are driven sequentially. These odd-numbered fields and even-numbered fields are alternately repeated according to the time range of the refresh rate. Then, in the first half of the odd field, the display data ([1], [3], ...) corresponding to the input image signal is written into each pixel area corresponding to the scan electrode of the odd row, and in the second half of the odd field, Black data is simultaneously written in each pixel region corresponding to all the scan electrodes in odd-numbered rows. In addition, in the first half of the even field, the display data ([2], [4], ...) corresponding to the input video signal is written into the pixel area corresponding to the scanning electrode of the even row, and in the second half of the even field, it is Black data is simultaneously written in the pixel regions corresponding to all the scan electrodes in the row.

However, the conventional liquid crystal display devices described above have the following problems. That is, in the liquid crystal display device of FIG. 18, compared with the case where the black insertion drive is not performed, there is a problem that since the operating frequency of each part is multiplied, a corresponding hardware configuration is required, resulting in an increase in scale and low power consumption. Added questions. Moreover, in this liquid crystal display device, the scanning electrode lines are driven sequentially, as shown in FIG. 20 , the voltage polarity of the display data D of each row is reversed, and the reversed mode is reversed at each refresh rate. Therefore, depending on the area of the liquid crystal panel, there will be a deviation in the voltage polarity of the displayed data, and the problem of burning the screen will occur. In addition, although the smearing of the animation is improved by the black insertion drive, there is a problem that the flickering feeling of the screen is increased because the black display and the video display alternately appear in a frequency band that can be recognized by humans. In order to suppress the flickering feeling, the refresh rate is increased. To a frequency band that cannot be recognized by human beings, the operating frequency multiplied by the black insertion driver must be multiplied again, which is very difficult in terms of hardware structure.

In addition, in the driving method described in Japanese Patent Application Laid-Open No. 04-044478, since alternate driving is performed, the operating frequency of each part is very low. The black data is written in each pixel area at the same time, and in the second half of the even field, the black data is written in each pixel area corresponding to all the scan electrodes of the even line at the same time, so the storage time of the liquid crystal in each line is different, and the display will appear. There is a problem of brightness difference between the top and bottom of the screen.

Contents of the invention

The present invention is accomplished in view of the above circumstances, and its purpose is to provide a liquid crystal display device, a drive control circuit and a driving method used in the liquid crystal display device with a relatively simple structure, which can reduce smear, burn, flicker, and display screen. Inner brightness difference.

The invention described in technical solution 1 is to provide a liquid crystal display device, which drives multiple rows of scanning electrodes and multiple columns of data electrodes arranged vertically to each other based on an input image signal, and writes predetermined display data into the pixel area corresponding to the liquid crystal layer to obtain a display image , is characterized in that it includes: a drive control unit, which performs field division driving, and performs an odd field in which the above-mentioned scanning electrodes of odd-numbered rows are sequentially driven and an even-numbered field in which the above-mentioned scanning electrodes of even-numbered rows are sequentially driven for the above-mentioned input image signal of each frame. The field is alternately repeated for field division driving, and the odd/even field is further composed of a first odd/even subfield and a second odd/even subfield, and during the first odd/even subfield period, the input image signal The corresponding display data lines are sequentially written into each pixel region, and during the second odd/even subfield period, the dark data lines are sequentially written into each of the above pixel regions.

According to the above-mentioned liquid crystal display device, it is characterized in that the voltage polarity of the data written in each pixel area corresponding to the above-mentioned scanning electrodes of the odd-numbered rows is reversed in each odd-numbered field, The voltage polarity of the data written in each pixel region corresponding to the scan electrode is reversed in each of the aforementioned even-numbered fields.

Also, the above-mentioned dark data is black data.

Moreover, according to the liquid crystal display device described in technical solution 1, it is characterized in that, while each of the above-mentioned scan electrodes in odd-numbered rows is sequentially driven in the above-mentioned odd-numbered field, the next one of each of the above-mentioned scan electrodes in the above-mentioned odd-numbered rows Each scanning electrode of the even-numbered row is driven, and while each of the above-mentioned scanning electrodes of the even-numbered row is sequentially driven in the above-mentioned even-numbered field, each of the above-mentioned scanning electrodes of the odd-numbered row before each of the above-mentioned scanning electrodes of the above-mentioned even-numbered row are driven in turn.

The second aspect of the present invention provides a drive control circuit, which is used to drive multiple rows of scanning electrodes and multiple columns of data electrodes arranged vertically to each other based on an input image signal, and write predetermined display data into the pixel area corresponding to the liquid crystal layer to obtain a display. The liquid crystal display device for images performs field division driving in which an odd field in which the scanning electrodes in odd rows are sequentially driven and an even field in which the scanning electrodes in even rows are sequentially driven are alternately repeated for each frame of the input video signal, and, The odd/even field is further composed of a first odd/even subfield and a second odd/even subfield, and during the first odd/even subfield period, the display data lines corresponding to the input video signal are sequentially written into the above In the pixel area, during the second odd/even subfield period, the dark data lines are sequentially written into the pixel area.

According to the above drive control circuit, it is characterized in that the voltage polarity of the data written in each pixel region corresponding to the above-mentioned scanning electrodes of odd-numbered rows is reversed in each of the above-mentioned odd-numbered fields, and the The voltage polarity of the data written in each pixel region corresponding to the scan electrodes is reversed in each of the even fields.

Also, the above-mentioned dark data is black data.

And, in the above-mentioned odd-numbered field, while each of the above-mentioned scan electrodes in odd-numbered rows is sequentially driven, each of the above-mentioned scan electrodes in the next even-numbered row of each of the above-mentioned odd-numbered rows of each scan electrode is sequentially driven, and in the above-mentioned even-numbered field When each of the scan electrodes in the even-numbered rows is sequentially driven, each of the scan electrodes in the odd-numbered rows before each scan electrode in the even-numbered rows is sequentially driven.

The third aspect of the present invention provides a driving method, which is used to drive multiple rows of scanning electrodes and multiple columns of data electrodes arranged vertically to each other based on an input image signal, and write predetermined display data into the pixel area corresponding to the liquid crystal layer to obtain a display image The liquid crystal display device of the above-mentioned input video signal of each frame performs field division driving in which odd fields in which the above-mentioned scanning electrodes in odd-numbered rows are sequentially driven and even-numbered fields in which the above-mentioned scanning electrodes in even-numbered rows are sequentially driven are alternately repeated, and the above-mentioned The odd/even field is further composed of a first odd/even subfield and a second odd/even subfield. During the first odd/even subfield, the display data lines corresponding to the input video signal are sequentially written into the pixels region, during the second odd/even subfield period, write dark data lines into the pixel region in sequence.

According to the above-mentioned driving method, it is characterized in that the voltage polarity of the data written in each pixel area corresponding to the above-mentioned scanning electrodes of the odd-numbered rows is reversed in each odd-numbered field, and the voltage polarity of the data written to the above-mentioned scanning electrodes of the even-numbered rows is inverted. The voltage polarity of the data written in each pixel area corresponding to the electrode is reversed in each even field.

Also, the above-mentioned dark data is black data.

And, in the above-mentioned odd-numbered field, while each of the above-mentioned scan electrodes in odd-numbered rows is sequentially driven, each of the above-mentioned scan electrodes in the next even-numbered row of each of the above-mentioned odd-numbered rows of each scan electrode is sequentially driven, and in the above-mentioned even-numbered field While each of the above-mentioned scan electrodes in the even-numbered rows is sequentially driven, each of the above-mentioned scan electrodes in the odd-numbered rows before each of the above-mentioned even-numbered rows is sequentially driven.

According to the composition of the present invention, the field division driving of the odd field and the even field is performed alternately, and the odd/even subfield is further composed of the first odd/even subfield and the second odd/even subfield. During the even subfield period, the display data corresponding to the input image signal is sequentially written into each pixel area line, and during the second odd/even subfield period, the dark data is sequentially written into each pixel area line, thus The frequency of the signal of each part can be halved. Thus, if the frequency of odd/even field switching is used as the frame frequency, the frequency doubling caused by the existing black insertion drive can cancel out the frequency half effect caused by the drive of the present invention, so it is possible to provide a system without The operating frequency of each part is multiplied due to black insertion driving, and a liquid crystal display device for reducing motion blur, a driving control circuit and a driving method used in the liquid crystal display device. And, if the frequency of odd/even field switching is a frequency that is a multiple of the frame frequency, the multiplication of the frequency caused by the high-speed frame frequency can cancel each other out with the half-frequency effect caused by the driving of the present invention, so it is different from the existing The black insertion drives the same operating frequency of each part, and the flickering frequency of black display and image display can be multiplied, so a liquid crystal display device, a driving control circuit and a driving method used in the liquid crystal display device can be provided to reduce animation blur , and eliminate the flicker caused by black insertion. In addition, since the display data and the dark data in the pixel regions corresponding to the scan electrodes are stored for the same time, it is possible to avoid the occurrence of a difference in luminance between the upper and lower sides of the display screen.

Furthermore, since the voltage polarity of the data written into the pixel regions corresponding to the scan electrodes of the odd rows is reversed every odd field, and the voltage polarity of the data written into the pixel regions corresponding to the scan electrodes of the even rows Since the polarity is reversed every even field, the deviation of the voltage polarity of the display data is reduced depending on the area of the liquid crystal panel, and the burn-in of the screen can be reduced. And, thus, if the switching frequency of the odd/even field is used as the frame frequency, the storage time of the black data as the dark data becomes longer, so even if it is driven by an in-plane electric field (IPS, In-P1ane Switching) type liquid crystal from The response speed from all white to all black is slow, and the effect of black insertion is difficult to fully exert the liquid crystal panel, and the black insertion drive can be easily realized. In addition, in odd fields, while the scan electrodes in odd rows are sequentially driven, the scan electrodes in even rows next to the scan electrodes in odd rows are sequentially driven; in even fields, the scan electrodes in even rows are sequentially driven. When the scan electrodes are sequentially driven, the scan electrodes of the odd-numbered rows before the scan electrodes of the even-numbered rows are sequentially driven, so that the luminance efficiency of the liquid crystal display device can be improved.

Description of drawings

FIG. 1 is a block diagram showing the electrical configuration of main parts of a liquid crystal display device according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing an example of the electrical structure of the liquid crystal display panel 14 in FIG. 1 .

FIG. 3 is a diagram showing the schematic structure of the liquid crystal display panel 14 and the position of the backlight 15 in FIG. 1 .

FIG. 4 is a timing chart illustrating the operation of the liquid crystal display device of FIG. 1 .

FIG. 5 is a diagram illustrating inversion of a polarity of a data voltage written in each pixel region in FIG. 2 .

FIG. 6 is a waveform diagram of each part for explaining the operation of the liquid crystal display device of FIG. 1 .

FIG. 7 is a diagram illustrating another example of inversion of the polarity of a data voltage written in each pixel region in FIG. 2 .

FIG. 8 is a diagram illustrating another example of inversion of the polarity of a data voltage written in each pixel region in FIG. 2 .

FIG. 9 is a diagram illustrating another example of inversion of the polarity of a data voltage written in each pixel region in FIG. 2 .

FIG. 10 is a diagram illustrating an example of a variation in the polarity of data voltages written to each pixel region in FIG. 2 .

FIG. 11 is a timing chart illustrating the operation of the liquid crystal display device according to the second embodiment of the present invention.

FIG. 12 is a diagram illustrating inversion of the polarity of data voltage written to each pixel region in the second embodiment.

FIG. 13 is a waveform diagram of each part for explaining the operation of the liquid crystal display device of the second embodiment.

14 is a diagram illustrating another example of inversion of the polarity of the data voltage written to the pixel region in the second embodiment.

15 is a diagram illustrating another example of inversion of the polarity of the data voltage written to the pixel region in the second embodiment.

16 is a diagram illustrating another example of inversion of the polarity of the data voltage written to the pixel region in the second embodiment.

FIG. 17 is a timing chart illustrating a modified example of the operation of the liquid crystal display device.

FIG. 18 is a diagram showing the electrical configuration of main parts of a conventional liquid crystal display device.

FIG. 19 is a timing chart illustrating the liquid crystal display device of FIG. 18 .

FIG. 20 is a timing chart illustrating the liquid crystal display device of FIG. 18 .

FIG. 21 is a waveform diagram of each part for explaining the operation of another conventional liquid crystal display device.

Detailed ways

The configuration, advantages, and features of the present invention will become clearer by description with reference to the accompanying drawings.

The best embodiment for carrying out the present invention will be described in detail below. Provided is a liquid crystal display device, a driving control circuit and a driving method used in the liquid crystal display device, the combination of field division driving and black insertion driving, the multiplication of the signal frequency of each part caused by the black insertion driving and the field division driving The halving of the signal frequency of each part cancels each other out, without doubling the frequency of each part to reduce motion blur. Furthermore, a liquid crystal display device, a driving control circuit and a driving method used in the liquid crystal display device are provided, and the combination of the field division driving and the black insertion driving, the increase of the signal frequency of each part caused by the increase of the frame frequency and the field The halving of the signal frequency of each part caused by the split drive cancels each other out, reducing motion blur and eliminating flicker caused by the black cut-in drive.

Example 1

FIG. 1 is a block diagram showing the electrical configuration of main parts of a liquid crystal display device according to a first embodiment of the present invention. The liquid crystal display device in this example, as shown in FIG. 1 , includes a timing controller 11 , a source driver 12 , a gate driver 13 , a liquid crystal display panel 14 , and a backlight 15 .

FIG. 2 is a schematic diagram showing an example of the electrical structure of the liquid crystal display panel 14 in FIG. 1 . This liquid crystal display panel 14 is a transmissive liquid crystal panel that makes the light of the backlight incident. As shown in FIG. ), multiple rows of scanning electrodes Yj (j=1, 2, . The data electrodes Xi are arranged at predetermined intervals in the x direction, and are applied with corresponding display data Di. The scan electrodes Yj are provided at predetermined intervals in the y direction perpendicular to the x direction, and are applied with a scan signal OUTj for writing display data Di. Each pixel area 20i, j is provided in one-to-one correspondence with the intersection area of the data electrode Xi and the scan electrode Yj, and is composed of TFT (Thin Film Transistor, thin film transistor) 21i, j, each liquid crystal unit 22i, j, and a common electrode COM. The TFTs 21i and j are controlled to be turned on/off based on the scanning signal OUTj, and when they are turned on, display data Di is applied to the liquid crystal cells 22i and j.

In this liquid crystal display panel 14, each scan electrode Yj and data electrode Xi are driven, that is, each scan signal OUTj is applied to each scan electrode Yj in a sequence corresponding to alternate driving, and corresponding display data is written to each data electrode Xi Di, thereby writing display data of a predetermined voltage into the pixel regions 20i and j corresponding to the display data Di, and controlling the alignment state of the liquid crystal constituting the liquid crystal layer of the liquid crystal display panel 14 based on the voltage, thereby changing the transmission of light. rate to get the displayed image. The source driver 12 collectively applies the display data Di to each data electrode Xi of the liquid crystal display panel 14 based on the control signal a from the timing controller 11 . The gate controller 13 applies the scan signal OUTj to the respective scan electrodes Yj of the liquid crystal display panel 14 in order corresponding to field division driving based on the control signal b from the timing controller 11 .

FIG. 3 is a diagram showing the schematic structure of the liquid crystal display panel 14 and the position of the backlight 15 in FIG. 1 . As shown in FIG. 3, the liquid crystal display panel 14 is composed of a pair of polarizers 31, 32, an opposing substrate 33, an active matrix substrate 34, and a liquid crystal layer 35 interposed therebetween. The common electrode COM in FIG. 2 is provided on the counter substrate 33 , and color filters 36 of R (red), G (green), and B (blue) are formed. 3 pixels with R, G, B constitute one point. The active matrix substrate 34 is provided with elements such as TFT 21i, j in FIG. 2 . The backlight 15 is arranged on the back side of the liquid crystal display panel, and the light such as LED (Light Emitting Diode, light emitting diode) is used as a surface light source, and the whole is formed to be approximately the same size as the display screen of the liquid crystal display panel 14.

In this liquid crystal display panel 14 , white light from the backlight 15 passes through the polarizing plate 32 and enters the liquid crystal layer 35 as linearly polarized light. The liquid crystal layer 35 is made of, for example, an In-Plane Switching (IPS, In-Plane Switching) type liquid crystal, which has an action of changing the direction of the polarization axis. The direction of the polarization axis. The direction of the polarization axis emitted from the liquid crystal layer 35 determines whether the emitted light is absorbed by the polarizer 32 . In this way, the transmittance of light is controlled by the voltage corresponding to the display data Di. Then, the light passing through each pixel is additively mixed by R, G, and B of the optical filter 36 to obtain a color image.

The timing controller 11 in FIG. 1 has a frame memory 11a, a black signal conversion section 11b, and a drive control section 11c. The frame memory 11a sequentially stores the input image signal VD, and the black signal conversion part 11b is sequentially constituted by the data from the frame memory 11a: the scanning electrodes Yj (j=2k-1, k=1, 2, ..., N, 2N=n) odd-numbered video sub-fields composed of video signals of odd-numbered lines, odd-numbered dark sub-fields composed of dark signals of the odd-numbered lines, scanning electrodes Yj (j=2k, k=1, 2, ..., N, 2N=n) an even-numbered image subfield formed by image signals, and an even-numbered dark subfield formed by the dark signals of the even-numbered rows. The drive control unit 11c sends out the subfield video signal constituted by the black signal conversion unit 11b, the control signal a of the source driver 12, and the control signal b of the gate driver 13 at predetermined timing based on the frame frequency of the input video signal VD. As a result, the drive control unit 11c sequentially writes the display data corresponding to the input video signal VD in the first half of the odd field (the first odd subfield period) to the pixel regions 20i and j lines corresponding to the scan electrodes Yj of the odd rows. data block, and in the second half of the odd field (the second odd subfield period), black data is sequentially written into the pixel regions 20i and j lines corresponding to the scan electrodes Yj of odd rows, and in the first half of the even field (the first even-numbered subfield period), the display data corresponding to the input video signal VD is sequentially written into the pixel regions 20i and j lines corresponding to the scan electrodes Yj of the even-numbered rows, and in the second half of the even-numbered field (the second half of the even-numbered field) During the second even-numbered subfield period), black data is sequentially written into the pixel regions 20i and j lines corresponding to the scan electrodes Yj of the even-numbered rows.

Furthermore, the drive control unit 11c inverts the voltage polarity of the data written in the pixel regions 20i, j corresponding to the scan electrodes Yj of the odd rows for every odd field, and inverts the voltage polarity of the data written to the pixel regions 20i, j corresponding to the scan electrodes Yj of the even rows. The voltage polarity of the data written in the pixel regions 20i, j of is reversed every even field. Further, the backlight 15 is driven by a not-shown backlight drive circuit based on a not-shown control signal from the timing controller 11 . Furthermore, the timing controller 11 , the source controller 12 and the gate controller 13 constitute a drive control circuit. In addition, the frame frequency of the input video signal VD is 60.00 Hz when the specification of the liquid crystal display panel 14 is, for example, XGA (Extended Graphics Array), 59.94 Hz when it is VGA (Video Graphics Array), and 59.94 Hz when it is SVGA (Super Video Graphics Array). 60.32Hz.

4 is a timing chart illustrating the operation of the liquid crystal display device in FIG. 1 , FIG. 5 is a diagram illustrating the inversion of the polarity of the data voltage written in the pixel regions 20i and j in FIG. 2 , and FIG. Waveform diagram of each part of the operation of the liquid crystal display device. In this liquid crystal display device, the drive control unit 11c performs field division driving in which the odd fields in which the scanning electrodes Yj of odd rows are sequentially driven and the even fields in which the scanning electrodes Yj of even rows are sequentially driven are alternately repeated. One frame of the video signal VD is input. In this case, thereafter, in the first half of the odd field (the first odd subfield period), the pixels corresponding to the input video signal VD are sequentially written into the pixel regions 20i and j lines corresponding to the scan electrodes Yj of the odd rows. After the data is displayed, in the second half of the odd field (the second odd subfield period), black data is sequentially written into the pixel regions 20i and j lines corresponding to the scan electrodes Yj in the odd rows. Then, in the first half of the even-numbered field (the first even-numbered subfield period), the display data corresponding to the input video signal VD is sequentially written into the pixel regions 20i and j lines corresponding to the scanning electrodes Yj of the even-numbered rows, and In the second half of the even field (the second even subfield period), black data is sequentially written in each pixel region 20i, line j corresponding to each scan electrode Yj of the even row.

In addition, in the present embodiment, the input video signal VD is configured based on a specification corresponding to alternate driving, and has periods corresponding to odd fields and even fields, respectively. In addition, the voltage polarity of the data written in the pixel regions 20i, j corresponding to the scan electrodes Yj of the odd rows is reversed every odd field by the drive control unit 11c, and the polarities of the data written in the scan electrodes Yj of the even rows are reversed every odd field. The voltage polarity of the data written in the pixel regions 20i and j corresponding to Yj is reversed every even field.

That is, as shown in FIG. 4 , in this embodiment, the odd-numbered field, the odd-numbered field, the odd-numbered field, the odd-numbered field in which the odd-numbered rows of the scanning electrodes (rows 1, 2, . . . , 2N-1, 2N) of the liquid crystal display panel 14 are driven sequentially. And the field division driving composed of the even-numbered fields in which the scan electrodes of the even-numbered rows are sequentially driven. The above-mentioned odd-numbered fields and even-numbered fields are alternately and repeatedly performed at a frame frequency. And, in the first half of the odd field (the first odd subfield period), the display data ([1], [3], . In the corresponding pixel regions, in the second half of the odd field (the second odd subfield period), black data is sequentially written in the pixel regions corresponding to the scan electrodes of the odd rows. And, in the first half of the even-numbered field (the first even-numbered sub-field period), the display data ([2], [4], ...) corresponding to the input image signal VD is sequentially written in lines corresponding to the scan electrodes of the even-numbered rows. In the corresponding pixel areas, in the second half of the even field (the second even subfield period), black data is sequentially written in each pixel area corresponding to the scan electrodes of the even rows.

And, the voltage polarity of the data written in each pixel area 20i, j, for example, as shown in FIG. 5(a), in the first half of the odd field, the polarity pattern shown in FIG. The voltage polarity of the display data [1] written in the pixel regions 20i and j corresponding to the scan electrodes (odd-numbered rows) of the row is reversed, and then as shown in FIG. 5(b), in the second half of the odd-numbered field, Black data is written maintaining the polarity of the first half. And, as shown in FIG. 5( e ), in the first half of the even field, for the polar pattern shown in FIG. 5( b ), for the pixel regions 20i, j The voltage polarity of the written display data [2] is reversed, and thereafter, as shown in FIG. 5(d), in the second half of the even field, black data is written while maintaining the polarity of the first half.

And, as shown in FIG. 5(e), in the first half of the odd field, for the polar pattern shown in FIG. 5(d), for the pixel regions 20i, j The voltage polarity of the written display data [3] is inverted, and thereafter, as shown in FIG. 5(f), in the second half of the odd field, black data is written while maintaining the polarity of the first half of the odd field. And, as shown in FIG. 5(g), in the first half of the even-numbered field, for the polar pattern shown in FIG. 5(f), for the pixel regions 20i, j The voltage polarity of the written display data [4] is reversed, and thereafter, as shown in FIG.

Therefore, as shown in FIG. 6, the frequency doubling of the frequency of the display data caused by the black insertion cancels out the frequency halving effect caused by the driving of the present invention. Therefore, for example, if the switching frequency of the odd/even field is set as the frame frequency of the input video signal VD, the frequencies of the display data Di, the control signal a, and the scanning signal OUTj are the same as those when the black insertion drive is not performed. The intake time of the panel is also the same as when the black insertion driving is not performed, and therefore, the frequency at which the polarity of the voltage of the display data Di is inverted is the same as when the black insertion driving is not performed. And, for the control signal b, for the gate driver 13, the gate driver clock is 2 rounds per row, and the gate driver is turned on and enabled, and only the gate voltage corresponding to the odd row is output in the odd field, and Only the gate voltage corresponding to the even-numbered row is output in the even-numbered field, whereby the scanning signal OUTj corresponding to the field division driving can be outputted.

As described above, in the first embodiment, the drive control unit 11c performs field division driving in which the odd field and the even field are alternately repeated, and in the first half of the odd field, the display data lines are sequentially written and scanned in the odd lines. In each pixel region 20i, j corresponding to the electrode Yj, and in the second half of the odd field, black data is sequentially written in each pixel region 20i, j corresponding to the scan electrode Yj of the odd row, and, in In the first half of the even-numbered field, the display data lines are sequentially written into the pixel regions 20i, j corresponding to the scan electrodes Yj of the even-numbered rows, and in the second half of the even-numbered field, the display data lines corresponding to the scan electrodes Yj of the even-numbered rows Black data is sequentially written in each pixel area 20i, j of the line. Therefore, for example, if the switching frequency of odd/even fields is set as the frame frequency, the frequency multiplication caused by the black insertion drive in the past and the frequency halving effect caused by the drive of the present invention offset, so it is possible to provide a liquid crystal display device, a liquid crystal display The drive control circuit and the drive method used in the device do not cause frequency multiplication of the actions of each part caused by the black insertion drive, and can reduce motion blur. In addition, since the storage time of the display data and the black data of each row is equal, there is no difference in luminance between the upper and lower sides of the display screen.

In addition, the polarity inversion drive for preventing burn-in of the liquid crystal screen of the liquid crystal driving method of the present invention includes methods shown in FIGS. 7 , 8 and 9 in addition to the above-mentioned FIG. 5 . Since the voltage polarity of the data written in the pixel regions 20i, j corresponding to the scan electrodes Yj of the odd rows is reversed every odd field, and the polarity of the data written in the pixel regions corresponding to the scan electrodes Yj of the even rows The voltage polarity of the data written in 20i, j is reversed every even field, so the display data Di voltage polarity in the liquid crystal panel area will not deviate, and the above-mentioned screen burn can be prevented. For example, as shown in FIG. 10(a), (b), (c), and (d), the voltage polarity of the data written in each pixel area 20i, j corresponding to the scan electrode Yj of an odd row In the method in which the voltage polarity of the data written in each pixel area 20i, j corresponding to the scan electrode Yj of the even row is not inverted in each odd field, and the voltage polarity is not inverted in each even field, in On the liquid crystal panel, the polarity of the display data Di voltage deviates. For example, in the display of the full white screen shown in FIG. In addition, since the storage time of black data, which is dark data, becomes longer, the response speed from full white to full black is slow for horizontal electric field drive (IPS, In-Plane Switching) liquid crystals, so it is difficult to make full use of it. The liquid crystal panel with black insertion effect can also easily realize black insertion driving.

Example 2

FIG. 11 is a timing chart illustrating the operation of the liquid crystal display device according to the second embodiment of the present invention. 12 is a diagram illustrating the voltage polarity inversion of data written in each pixel region of the second embodiment, FIG. 13 is a waveform diagram illustrating each part of the operation of each liquid crystal display device of the second embodiment, and FIG. 14 is A diagram of another example of voltage polarity inversion of write data written in the pixel region of the second embodiment. 15 is a diagram showing another example of voltage polarity inversion of write data written in a pixel region in the second embodiment. 16 is a diagram showing another example of voltage polarity inversion of write data written in the pixel region in the second embodiment. The processing contents of the driving method used in the liquid crystal display device in this example will be described with reference to the above-mentioned figures. In the liquid crystal display device of the second embodiment, as shown in FIG. 11, in the first half of the odd field (first odd subfield period), the display data ([1], [3]) corresponding to the input video signal VD ], ...) lines are sequentially written into the pixel regions corresponding to the scan electrodes of the odd row, while the scan electrodes corresponding to the scan electrodes of the next row (that is, the even row) of the scan electrodes of the odd row The display data ([1], [3], ...) is written sequentially in each pixel area, and in the second half of the odd field (the second odd subfield period), scanning of odd and even lines Black data is sequentially written in the pixel area corresponding to the electrode.

And, in the first half of the even-numbered field (the first even-numbered subfield period), the display data ([2], [4], ...) lines corresponding to the input image signal VD are sequentially written into the scanning electrodes of the even-numbered rows. At the same time in each corresponding pixel area, the display data is also sequentially written in each pixel area corresponding to each scan electrode of the previous row (that is, an odd row) of each scan electrode of the even row ([2 ], [4], ...), in the second half of the even field (the second even subfield period), black data is sequentially written in each pixel area corresponding to the scan electrodes of the even and odd rows. Thus, the frequencies of the display data Di, the control signal a, and the scanning signal OUTj, and the writing time of the liquid crystal are the same as those in the first embodiment, and the luminance efficiency of the liquid crystal display device is improved. In this case, the voltage polarity of the data written in each pixel region 20i, j is, for example, as shown in FIG. The voltage polarity of the data written in the corresponding pixel regions 20i, j+1 is reversed every two odd fields and every two even fields. As shown in FIG. 13 , the waveforms of each part are written in even lines at the same time in odd fields, and written in odd lines at the same time in even fields. Other contents are the same as those in Figure 6.

In addition, as shown in Figure 14(a), (b), (c), and (d), in the pixel area corresponding to the scanning electrodes Yj, j+1 of every two odd-numbered rows and every two even-numbered rows In the method in which the voltage polarity of the data written in 20i, j+1 is reversed every odd field and even field, as shown in FIG. Write image data voltages in odd fields. That is, in this case, a voltage for writing only video data of the same polarity is generated, so if this state continues for a long time, burns will occur on the switching boundary line of the screen, which is not preferable. On the other hand, the polarity inversion shown in FIG. 12 mentioned above is shown in FIG. 16(j). The voltage polarity of the data written in the pixel regions 20i and j+1 corresponding to the scan electrodes Yj and j+1 is reversed every two odd fields and every two even fields, even at the switching boundary line of the screen On the display, the voltage polarity of the display data Di will not deviate, and will not cause burns.

Example 3

Fig. 17 is a timing chart illustrating the operation of the liquid crystal display device according to the third embodiment of the present invention. The above-mentioned embodiment 1 is driven at half the frequency of normal black insertion, but in embodiment 3, when the double-speed driving of the liquid crystal panel and each circuit is possible, 1 frame is divided into 4 fields, and the odd number When the switching frequency of the even-numbered field is set to a frequency more than twice the frame frequency, a liquid crystal display device, a drive control circuit and a driving method used in the liquid crystal display device can be provided, and the frequency multiplication caused by the high-speed frame frequency is related to the frequency multiplication of the liquid crystal display device. The frequency halving effect caused by the inventive drive cancels out, so the flickering frequency of black display and image display is doubled with the same operating frequency of each part as the existing black insertion drive, so the motion blur can be reduced, and black insertion is eliminated. flickering. In addition, FIG. 17 shows the method of increasing the frame frequency in the first embodiment, and similarly, the same effect can be obtained by increasing the speed in the second embodiment.

The embodiment of the present invention has been described above in detail, but the specific structure is not limited to the embodiment, and changes in design within the range not departing from the idea of the present invention are included in the present invention. For example, regardless of whether the input video signal VD is alternately driven or progressively driven, by using the timing controller 11 to change the input video signal VD, the same functions and effects as those of the first, second and third embodiments described above can be obtained. In addition, the gate driver 13 in FIG. 1 may be divided into a part for applying the scanning signal OUTj to the scanning electrodes Yj in the odd-numbered rows of the liquid crystal display panel 14 and a part for applying the scanning signal OUTj to the scanning electrodes Yj in the even-numbered rows. part. In this case, the timing controller 11 also needs to have a configuration corresponding to this configuration. And, the liquid crystal display panel 14 in Fig. 1 is not limited to the structure of Fig. 2 and Fig. 3, for example also can use the liquid crystal panel of TN (Twisted Nematic) type liquid crystal and VA (Vertical Alignment) type liquid crystal.

Also, in the above-mentioned embodiment, black data is used as dark data, but it is not limited to black data, even if it is data having a gradation similar to black data, substantially the same operations and effects as those of the above-mentioned embodiment can be obtained. Furthermore, the voltage polarity of the data written in the pixel area is not limited to the polarity shown in FIG. 5 . Moreover, as shown in the timing diagrams of FIGS. 6 and 13, the waveform of the display data Di corresponds to the case where the liquid crystal display panel 14 is a normally black (Normally black) type, but it may also be a normally white (Normally white) type liquid crystal panel. .

The present invention can be applied to liquid crystal display devices for displaying moving images, such as liquid crystal televisions and liquid crystal displays for moving pictures.

Claims (15)

1. A liquid crystal display device, based on an input image signal, drives multi-row scanning electrodes and multi-column data electrodes arranged vertically to each other, and writes predetermined display data into the pixel area corresponding to the liquid crystal layer to obtain a display image, which is characterized in that it includes : The drive control circuit performs field division driving, and performs field division driving in which odd fields in which the scanning electrodes in odd rows are sequentially driven and even fields in which the scanning electrodes in even rows are sequentially driven are alternately repeated for the input image signal of each frame. , and, the odd/even field is further composed of a first odd/even subfield and a second odd/even subfield, and during the first odd/even subfield period, the display data lines corresponding to the input image signal are sequentially Writing into each pixel area, during the second odd/even subfield period, writing dark data lines into each of the above pixel areas sequentially. 2. The liquid crystal display device according to claim 1, wherein: The voltage polarity of the data written to each pixel area corresponding to the above-mentioned scan electrodes of odd-numbered rows is reversed every odd-numbered field, and the data written to each pixel area corresponding to the above-mentioned scan electrodes of even-numbered rows The polarity of the voltage is reversed at each of the above even fields. 3. The liquid crystal display device according to claim 1, wherein: The above dark data is black data. 4. The liquid crystal display device according to claim 1, wherein: In the above-mentioned odd-numbered field, while each of the above-mentioned scanning electrodes in the odd-numbered rows is sequentially driven, each scanning electrode in the next even-numbered row of each of the above-mentioned scanning electrodes in the above-mentioned odd-numbered rows is driven, In the even-numbered field, each of the scan electrodes in odd-numbered rows before each of the scan electrodes in even-numbered rows is sequentially driven while each of the scan electrodes in even-numbered rows is sequentially driven. 5. The liquid crystal display device according to claim 2, wherein: In the above-mentioned odd-numbered field, while each of the above-mentioned scanning electrodes in the odd-numbered rows is sequentially driven, each scanning electrode in the next even-numbered row of each of the above-mentioned scanning electrodes in the above-mentioned odd-numbered rows is driven, In the even-numbered field, each of the scan electrodes in odd-numbered rows before each of the scan electrodes in even-numbered rows is sequentially driven while each of the scan electrodes in even-numbered rows is sequentially driven. 6. A drive control circuit, used to drive multiple rows of scanning electrodes and multiple columns of data electrodes arranged vertically to each other based on an input image signal, and write predetermined display data into the pixel area corresponding to the liquid crystal layer to obtain a liquid crystal display device displaying an image , With respect to the above-mentioned input image signal of each frame, the field-divided driving is alternately repeated in the odd field in which the above-mentioned scanning electrodes of odd-numbered rows are sequentially driven and the even-numbered field in which the above-mentioned scanning electrodes of even-numbered rows are sequentially driven, and the above-mentioned odd-numbered/even-numbered fields are further It consists of a first odd/even subfield and a second odd/even subfield. During the first odd/even subfield, the display data lines corresponding to the input video signal are sequentially written into the pixel area. During two odd/even subfields, the dark data lines are sequentially written into the above pixel regions. 7. The drive control circuit according to claim 6, characterized in that, The voltage polarity of the data written in each pixel area corresponding to the above-mentioned scanning electrodes of odd-numbered rows is reversed in each of the above-mentioned odd-numbered fields, and the voltage polarity of the data written into each pixel area corresponding to the above-mentioned scanning electrodes of even-numbered rows The voltage polarity of the data is inverted every above-mentioned even field. 8. The drive control circuit according to claim 6, characterized in that, The above dark data is black data. 9. The drive control circuit according to claim 6, characterized in that, In the above-mentioned odd-numbered field, while each of the above-mentioned scan electrodes in the odd-numbered rows is sequentially driven, each of the above-mentioned scan electrodes in the next even-numbered rows of each of the above-mentioned odd-numbered rows of the scan electrodes is sequentially driven, In the even field, each of the scan electrodes in the even row is sequentially driven, and at the same time, each of the scan electrodes in the odd row before each scan electrode in the even row is sequentially driven. 10. The drive control circuit according to claim 7, characterized in that, In the above-mentioned odd-numbered field, while each of the above-mentioned scan electrodes in the odd-numbered rows is sequentially driven, each of the above-mentioned scan electrodes in the next even-numbered rows of each of the above-mentioned odd-numbered rows of the scan electrodes is sequentially driven, In the even field, each of the scan electrodes in the even row is sequentially driven, and at the same time, each of the scan electrodes in the odd row before each scan electrode in the even row is sequentially driven. 11. A driving method, which is used to drive multiple rows of scanning electrodes and multiple columns of data electrodes arranged vertically to each other based on an input image signal, and write predetermined display data to a pixel area corresponding to a liquid crystal layer to obtain a liquid crystal display device displaying an image, With respect to the above-mentioned input image signal of each frame, the field-divided driving is alternately repeated in the odd field in which the above-mentioned scanning electrodes of odd-numbered rows are sequentially driven and the even-numbered field in which the above-mentioned scanning electrodes of even-numbered rows are sequentially driven, and the above-mentioned odd-numbered/even-numbered fields are further It consists of a first odd/even subfield and a second odd/even subfield. During the first odd/even subfield, the display data lines corresponding to the input video signal are sequentially written into the pixel area. During two odd/even subfields, the dark data lines are sequentially written into the above pixel regions. 12. The driving method according to claim 11, characterized in that, The voltage polarity of the data written to each pixel area corresponding to the above-mentioned scan electrodes of odd-numbered rows is reversed every odd-numbered field, and the data written to each pixel area corresponding to the above-mentioned scan electrodes of even-numbered rows The voltage polarity is reversed at every even field. 13. The driving method according to claim 11, characterized in that, The above dark data is black data. 14. The driving method according to claim 11, characterized in that, In the above-mentioned odd-numbered field, while each of the above-mentioned scan electrodes in the odd-numbered rows is sequentially driven, each of the above-mentioned scan electrodes in the next even-numbered rows of each of the above-mentioned odd-numbered rows of the scan electrodes is sequentially driven, While each of the scan electrodes in even rows is sequentially driven in the even field, each of the scan electrodes in odd rows preceding each scan electrode in the even rows is sequentially driven. 15. The driving method according to claim 12, characterized in that, The voltage polarity of the data written to each pixel area corresponding to the above-mentioned scan electrodes of odd-numbered rows is reversed every odd-numbered field, and the data written to each pixel area corresponding to the above-mentioned scan electrodes of even-numbered rows The voltage polarity is reversed at every even field.

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