CN105810159A - Liquid crystal display control method and liquid crystal display - Google Patents

Abstract

The invention relates to a liquid crystal display control method and a liquid crystal display. The method comprises: after the liquid crystal display is powered on, the image signal scanning of the liquid crystal display panel and the dimming signal scanning of the backlight board are started; The phase of the dimming signal is asynchronous; the relationship between the scanning frequency A of the backlight dimming signal and the scanning frequency B of the image signal of the liquid crystal display panel satisfies: A>B, and A≠N*B, where N is an integer greater than 0. The invention avoids the flickering phenomenon of the backlight when scanning relative to the screen, improves the display quality effect of liquid crystal displays such as liquid crystal televisions, makes the product have high cost performance, and improves the market competitiveness of the product.

Description

Liquid crystal display control method and liquid crystal display

technical field

The invention relates to the technical field of liquid crystal televisions, in particular to a liquid crystal display control method and a liquid crystal display.

Background technique

In the current liquid crystal display device, the backlight and the liquid crystal display panel (OpenCell) adopt synchronous scanning technology. In the state of backlight Duty=100%, the application of this technology can meet the quality requirements of LCD display; when the backlight Duty<100%, the backlight is flickering brightly and darkly, and at this time, with the synchronous scanning of the LCD panel, the image quality can be improved. An exception will occur.

With the development of LCD TV technology, in order to pursue high image quality requirements, technologies such as Local Dimming (local bright and dark control), natural light, and motion compensation will be added to the image quality processing functions of the core. The application of these technologies changes the Duty value of the backlight. During the user's use, the backlight flickers brightly and darkly, which will affect the image quality.

Contents of the invention

The main purpose of the present invention is to provide a liquid crystal display control method and a liquid crystal display, aiming at improving the display quality effect of a liquid crystal television.

In order to achieve the above object, the present invention proposes a liquid crystal display control method, comprising:

After the liquid crystal display is powered on, the image signal scanning of the liquid crystal display panel and the dimming signal scanning of the backlight panel are started,

The phases of the image signal of the liquid crystal display panel and the dimming signal of the backlight panel are asynchronous;

The relationship between the scanning frequency A of the backlight dimming signal and the scanning frequency B of the image signal of the liquid crystal display panel satisfies: A>B, and A≠N*B, where N is an integer greater than 0.

Preferably, the scanning start time of the dimming signal is later than the scanning start time of the image signal.

Preferably, the time when the backlight of the backlight panel is turned on for the first time is within 1/5*Tr time after the time when the liquid crystal of the liquid crystal display panel starts to rotate, wherein Tr is the liquid crystal molecule of the liquid crystal display panel switching between two screens The time of rotation.

Preferably, the scanning start time of the dimming signal is misaligned with the scanning start time of the image signal, and the time when the backlight of the backlight panel is turned on for the first time is within 1/5*Tr time before the time when the liquid crystal of the liquid crystal display panel finishes rotating. , where Tr is the rotation time of the liquid crystal molecules of the liquid crystal display panel switching between two screens.

Preferably, A>B+24HZ.

Embodiments of the present invention also propose a liquid crystal display for controlling liquid crystal display, including:

The starting module is used to start the image signal scanning of the liquid crystal display panel and the dimming signal scanning of the backlight board after the liquid crystal display is powered on, and the phase of the image signal of the liquid crystal display panel and the dimming signal of the backlight board is asynchronous; the backlight The relationship between the scanning frequency A of the dimming signal and the scanning frequency B of the image signal of the liquid crystal display panel satisfies: A>B, and A≠N*B, where N is an integer greater than 0.

Preferably, the scanning start time of the dimming signal is later than the scanning start time of the image signal.

Preferably, the time when the backlight of the backlight panel is turned on for the first time is within 1/5*Tr time after the time when the liquid crystal of the liquid crystal display panel starts to rotate, wherein Tr is the liquid crystal molecule of the liquid crystal display panel switching between two screens The time of rotation.

Preferably, the scanning start time of the dimming signal is misaligned with the scanning start time of the image signal, and the time when the backlight of the backlight panel is turned on for the first time is within 1/5*Tr time before the time when the liquid crystal of the liquid crystal display panel finishes rotating. , where Tr is the rotation time of the liquid crystal molecules of the liquid crystal display panel switching between two screens.

Preferably, A>B+24HZ.

In the liquid crystal display control method and the liquid crystal display proposed by the embodiments of the present invention, after the liquid crystal display is powered on, the image signal scanning of the liquid crystal display panel and the dimming signal scanning of the backlight board are started, and the image signal of the liquid crystal display panel and the backlight board The phase of the dimming signal is asynchronous; the relationship between the scanning frequency A of the backlight dimming signal and the scanning frequency B of the image signal of the liquid crystal display panel satisfies: A>B, and A≠N*B, wherein, N is an integer greater than 0, by This avoids the flickering phenomenon of the backlight scanning relative to the screen, improves the display quality effect of liquid crystal displays such as LCD TVs, makes the product cost-effective, and enhances the market competitiveness of the product.

Description of drawings

Figure 1 is the scanning frequency design of the traditional backlight and LCD panel, equipped with the image quality processing function of the core, and the corresponding single-pixel timing diagram;

Figure 2 shows the scanning frequency design of the traditional backlight and LCD panel, equipped with the image quality processing function of the core, using the MPRT instrument to test the moving picture switching process, and the RGB brightness change curve of a single pixel point S period integral average;

Fig. 3 is a phase asynchronous scanning design of the backlight and the liquid crystal display panel of the embodiment of the present invention, equipped with a core image quality processing function, and a timing diagram of a corresponding single pixel point;

Fig. 4 is another timing diagram of a single pixel corresponding to the phase asynchronous scanning design of the backlight and the liquid crystal display panel of the embodiment of the present invention, equipped with the image quality processing function of the core;

Fig. 5 is the asynchronous scanning design of the backlight and the liquid crystal display panel of the embodiment of the present invention, equipped with the image quality processing function of the core, using the MPRT instrument to test the moving picture switching process, and the RGB brightness change curve of a single pixel point S period integral average.

In order to make the technical solution of the present invention clearer and clearer, it will be further described below in conjunction with the accompanying drawings.

detailed description

It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The solution of the embodiment of the present invention is mainly: after the liquid crystal display is powered on, the image signal scanning of the liquid crystal display panel and the dimming signal scanning of the backlight board are started, and the phases of the image signal of the liquid crystal display panel and the dimming signal of the backlight board are asynchronous; In addition, the frequency of the backlight dimming signal (PWM frequency of the backlight driver board) A is different from the scanning frequency B of the liquid crystal display panel. A>B+24HZ, and A≠N*B (N=1, 2, . . . ), through the above timing design, the image quality of the liquid crystal display can be greatly improved.

A preferred embodiment of the present invention proposes a liquid crystal display control method, including:

After the liquid crystal display is powered on, the image signal scanning of the liquid crystal display panel and the dimming signal scanning of the backlight panel are started, and the phase asynchronous of the image signal of the liquid crystal display panel and the dimming signal of the backlight panel; the scanning frequency of the backlight dimming signal The relationship between A and the image signal scanning frequency B of the liquid crystal display panel satisfies: A>B, and A≠N*B, where N is an integer greater than 0.

In the prior art, when the backlight Duty<100%, the backlight flickers brightly and darkly, and at the same time, the backlight and the liquid crystal display panel adopt synchronous scanning, resulting in abnormal image quality.

In this embodiment, the dimming signal of the backlight panel is scanned asynchronously with the liquid crystal display panel, even if the phases of the image signal of the liquid crystal display panel and the dimming signal of the backlight panel are asynchronous, and the scanning frequency A of the backlight dimming signal and the image of the liquid crystal display panel are adjusted. The signal scanning frequency B is different, and with the image quality processing function of the movement, it can avoid the flickering phenomenon of the backlight when scanning relative to the screen, and realize the optimization of the image quality of the LCD display.

Specifically, after the liquid crystal display is powered on, first, the core of the liquid crystal display inputs an image signal scanning control signal to the screen driver of the liquid crystal display panel, and the screen driver of the liquid crystal display panel starts image signal scanning according to the received image signal scanning control signal. , the liquid crystal molecules in the liquid crystal display panel start to rotate; in addition, the screen driver of the liquid crystal display panel feeds back a corresponding control signal to the backlight driver, and the backlight driver starts dimming signal scanning after receiving the control signal fed back from the liquid crystal display panel, and controls the backlight The backlight of the board is controlled at the time when it is turned on, and the light and dark switches are periodically controlled for dimming.

In this embodiment, by making the start-up time of the backlight dimming signal scanning have a certain delay compared with the start-up time T1 of the image signal scanning of the liquid crystal display panel, and adjusting the scanning frequency of the backlight dimming signal and the image signal scanning of the liquid crystal display panel The frequency is different, and the dimming signal of the backlight panel is asynchronous with the scanning phase of the screen.

In order to prevent the blur effect produced by the liquid crystal rotation from being perceived by human eyes, generally, 1/5*Tr after the liquid crystal rotation starts and ends Time) During the time period, it is considered that the state of the liquid crystal is consistent with the stable state before the start of rotation or after the end of rotation. Therefore, in this interval, the backlight is turned on, and the problem of poor image quality will not be derived.

Based on the above considerations, in this embodiment, when controlling the turning-on time of the backlight of the backlight panel, the following scheme can be specifically adopted:

As an implementation, as shown in FIG. 3 , after the liquid crystal display is powered on, the image signal scanning of the liquid crystal display panel is started. The start scanning time T1 of the signal is not equal, and the scanning start time of the dimming signal is later than the scanning start time of the image signal; in addition, the backlight is started within △T time after T1, and the △T is after the liquid crystal molecule rotation of the liquid crystal display panel starts 1/5*Tr of 1/5*Tr, that is to control the time when the backlight of the backlight is turned on is within 1/5*Tr time after the time when the liquid crystal starts to rotate, where Tr is the rotation time of the liquid crystal molecules of the liquid crystal display panel when switching between two screens time.

As another implementation manner, as shown in FIG. 4 , after the liquid crystal display is powered on, the image signal scanning of the liquid crystal display panel is started, and the start time is T1; Start the backlight within the Tr-△T time after T1. The △T is 1/5*Tr before the rotation of the liquid crystal molecules of the liquid crystal display panel ends, that is, the time of turning on the backlight of the backlight panel is 1 time before the rotation of the liquid crystal ends. /5*Tr time, where Tr is the rotation time for the liquid crystal molecules of the liquid crystal display panel to switch between two screens, and Tr is the rotation time for the liquid crystal molecules of the liquid crystal display panel to switch between two screens.

After starting the scanning of the image signal of the LCD panel and the scanning of the backlight dimming signal, adjust the PWM frequency A of the backlight driver board to make it asynchronous with the scanning frequency B of the LCD panel. The relationship between the scanning frequency A of the backlight dimming signal and the scanning frequency B of the image signal of the liquid crystal display panel satisfies: A>B, and A≠N*B, where N is an integer greater than 0. As a preferred solution, the scanning frequency of the backlight At least greater than the screen scanning frequency of 24HZ, that is, A>B+24HZ, and A≠N*B (N=1, 2,...). The timing design mentioned above can greatly improve the image quality effect of the liquid crystal display.

In this embodiment, through the above scheme, after the liquid crystal display is powered on, the image signal scanning of the liquid crystal display panel and the dimming signal scanning of the backlight board are started, and the phases of the image signal of the liquid crystal display panel and the dimming signal of the backlight board are asynchronous; The relationship between the signal scanning frequency A and the image signal scanning frequency B of the liquid crystal display panel satisfies: A>B, and A≠N*B, wherein, N is an integer greater than 0, thereby avoiding the flickering phenomenon of the backlight relative to the screen scanning, The display quality effect of liquid crystal displays such as liquid crystal TVs is improved, the products are cost-effective, and the market competitiveness of the products is enhanced.

Further, as an example to test the image quality improvement effect of the embodiment of the present invention, the test simulation results of the MPRT instrument may be introduced as the image quality judgment standard.

Among them, the MPRT instrument is a test instrument that simulates the human eye to observe the quality effect of moving pictures and quantifies it in a graphical way.

Referring to Figure 1 and Figure 2, Figure 1 is a traditional backlight (BLU) and liquid crystal display panel (OpenCell) scanning frequency design, equipped with the image quality processing function of the core, and the corresponding single-pixel timing diagram.

Figure 2 shows the scanning frequency design of the traditional backlight and LCD panel, equipped with the image quality processing function of the core, using the MPRT instrument to test the moving picture switching process, and the RGB brightness change curve of a single pixel point S (S ≥ 20) cycle integral average .

Since the traditional backlight and the LCD panel scan synchronously, the backlight switch and the LCD panel scan are always in the same phase for a single pixel point within S cycles. After integration, it can be clearly observed from the curve that there is an inflection point in the RGB curve, that is, the backlight Bright and dark flickering will be captured, reflecting the deterioration of the image quality of the human eye.

Referring to Fig. 3 and Fig. 4, Fig. 3 and Fig. 4 are respectively the phase asynchronous scanning design of the dimming signal of the backlight panel and the image signal of the liquid crystal display panel of the embodiment of the present invention, that is, to adjust the backlight startup time and the backlight driving PWM frequency Finally, it is equipped with the image quality processing function of the movement, corresponding to the two timing diagrams of the single pixel. Wherein, Tr is the rotation time of the liquid crystal switching between two screens.

In order to prevent the blur effect produced by the rotation of the liquid crystal from being perceived by the human eye, generally, within 1/5*Tr time after the start of the rotation of the liquid crystal and before the end of the rotation, it is considered that the state of the liquid crystal is the same as the stable state before the start of the rotation or after the end of the rotation. Therefore, in this interval, the backlight is turned on, and the problem of poor image quality will not be derived.

In this embodiment, in the phase asynchronous design of the backlight and the liquid crystal display panel, in the control of the scanning of the liquid crystal display panel and the start-up time of the backlight, it is necessary to meet the time when the backlight is turned on and the time when the liquid crystal remains in a stable state, that is, the time when the backlight is turned on must be delayed from that of the liquid crystal display panel. The scanning start time of the backlight can be within △T=1/5*Tr time after the liquid crystal starts to rotate (as shown in the timing diagram in Figure 3), or before the time when the liquid crystal ends rotation △T=1/5 *Tr time (as shown in the timing diagram in Figure 4).

Referring to Fig. 5, Fig. 5 is the asynchronous scanning design of the backlight and the liquid crystal display panel of the embodiment of the present invention, equipped with the image quality processing function of the core, and using the MPRT instrument to test the moving picture switching process, a single pixel point S (S ≥ 20) The RGB luminance change curve of the periodic integral average.

As can be seen from Fig. 5, since the backlight of the present invention and the liquid crystal display panel are asynchronous scanning, the scanning phase of the backlight switch and the liquid crystal display panel is always changing for a single pixel point in S periods, and can be observed from the curve after integration There is no inflection point in the RGB curve, that is, the flickering phenomenon of the backlight is optimized by this technology, which reflects that the image quality of the human eye is improved to the best state.

Correspondingly, the present invention proposes a liquid crystal display for controlling liquid crystal display.

A preferred embodiment of the present invention proposes a liquid crystal display for controlling liquid crystal display, including: a start-up module wherein:

The starting module 201 is used to start the image signal scanning of the liquid crystal display panel and the dimming signal scanning of the backlight board after the liquid crystal display is powered on, and the phase of the image signal of the liquid crystal display panel and the dimming signal of the backlight board is asynchronous; the backlight dimming signal The relationship between the scanning frequency A and the scanning frequency B of the image signal of the liquid crystal display panel satisfies: A>B, and A≠N*B, where N is an integer greater than 0.

Further, the start-up module 201 is also used to control the timing of turning on the backlight of the backlight panel, specifically for controlling the start scanning time of the dimming signal of the backlight panel and the timing of the image signal of the liquid crystal display panel after the liquid crystal display is powered on. The start scanning time is not equal; and the backlight turn-on time of the control backlight plate is within 1/5*Tr time after the time when the liquid crystal starts to rotate, where Tr is the time for the liquid crystal molecules of the liquid crystal display panel to switch between two screens and rotate or control the backlight turn-on time of the backlight plate within 1/5*Tr time before the liquid crystal ends the rotation time, wherein, Tr is the time for the liquid crystal molecules of the liquid crystal display panel to switch between two pictures.

Specifically, after the liquid crystal display is powered on, first, the core of the liquid crystal display inputs an image signal scanning control signal to the screen driver of the liquid crystal display panel, and the screen driver of the liquid crystal display panel starts image signal scanning according to the received image signal scanning control signal. , the liquid crystal molecules in the liquid crystal display panel start to rotate; in addition, the screen driver of the liquid crystal display panel feeds back a corresponding control signal to the backlight driver, and the backlight driver starts dimming signal scanning after receiving the control signal fed back from the liquid crystal display panel, and controls the backlight The backlight of the board is controlled at the time when it is turned on, and the light and dark switches are periodically controlled for dimming.

In this embodiment, the scan start time of the backlight dimming signal has a certain delay compared with the start time T1 of the image signal scan of the liquid crystal display panel, and the scan start time of the dimming signal is later than the scan start time of the image signal. time or the scanning start time of the dimming signal is misaligned with the scanning starting time of the image signal, and the scanning frequency of the dimming signal of the backlight is adjusted to be different from the scanning frequency of the image signal of the liquid crystal display panel, so as to realize the scanning of the dimming signal of the backlight panel and the screen phase asynchronous.

In order to prevent the blur effect produced by the liquid crystal rotation from being perceived by human eyes, generally, 1/5*Tr after the liquid crystal rotation starts and ends Time) During the time period, it is considered that the state of the liquid crystal is consistent with the stable state before the start of rotation or after the end of rotation. Therefore, in this interval, the backlight is turned on, and the problem of poor image quality will not be derived.

Based on the above considerations, when controlling the backlight turn-on time of the backlight panel, the following scheme can be specifically adopted:

As an implementation, as shown in FIG. 3 , after the liquid crystal display is powered on, the image signal scanning of the liquid crystal display panel is started. The start scanning time T1 of the signal is not equal, and the scanning start time of the dimming signal is later than the scanning start time of the image signal; in addition, the backlight is started within △T time after T1, and the △T is after the liquid crystal molecule rotation of the liquid crystal display panel starts 1/5*Tr of 1/5*Tr, that is to control the time when the backlight of the backlight is turned on is within 1/5*Tr time after the time when the liquid crystal starts to rotate, where Tr is the rotation time of the liquid crystal molecules of the liquid crystal display panel when switching between two screens time.

As another implementation manner, as shown in FIG. 4 , after the liquid crystal display is powered on, the image signal scanning of the liquid crystal display panel is started, and the start time is T1; Start the backlight within the Tr-△T time after T1. The △T is 1/5*Tr before the rotation of the liquid crystal molecules of the liquid crystal display panel ends, that is, the time of turning on the backlight of the backlight panel is 1 time before the rotation of the liquid crystal ends. /5*Tr time, where Tr is the rotation time for the liquid crystal molecules of the liquid crystal display panel to switch between two screens, and Tr is the rotation time for the liquid crystal molecules of the liquid crystal display panel to switch between two screens.

After starting the scanning of the image signal of the liquid crystal display panel and the scanning of the backlight dimming signal, adjust the PWM frequency A of the backlight driver board to make it asynchronous with the scanning frequency B of the liquid crystal display panel. The relationship between the scanning frequency A of the backlight dimming signal and the scanning frequency B of the image signal of the liquid crystal display panel satisfies: A>B, and A≠N*B, where N is an integer greater than 0. As a preferred solution, the scanning frequency of the backlight At least greater than the screen scanning frequency of 24HZ, that is, A>B+24HZ, and A≠N*B (N=1, 2,...). The timing design mentioned above can greatly improve the image quality effect of the liquid crystal display.

In this embodiment, through the above scheme, after the liquid crystal display is powered on, the image signal scanning of the liquid crystal display panel and the dimming signal scanning of the backlight board are started, and the phases of the image signal of the liquid crystal display panel and the dimming signal of the backlight board are asynchronous; The relationship between the signal scanning frequency A and the image signal scanning frequency B of the liquid crystal display panel satisfies: A>B, and A≠N*B, wherein, N is an integer greater than 0, thereby avoiding the flickering phenomenon of the backlight relative to the screen scanning, The display quality effect of liquid crystal displays such as liquid crystal TVs is improved, the products are cost-effective, and the market competitiveness of the products is enhanced.

Further, as an example to test the image quality improvement effect of the embodiment of the present invention, the test simulation results of the MPRT instrument may be introduced as the image quality judgment standard.

Among them, the MPRT instrument is a test instrument that simulates the human eye to observe the quality effect of moving pictures and quantifies it in a graphical way.

Referring to Figure 1 and Figure 2, Figure 1 is a traditional backlight (BLU) and liquid crystal display panel (OpenCell) scanning frequency design, equipped with the image quality processing function of the core, and the corresponding single-pixel timing diagram.

Figure 2 shows the scanning frequency design of the traditional backlight and LCD panel, equipped with the image quality processing function of the core, using the MPRT instrument to test the moving picture switching process, and the RGB brightness change curve of a single pixel point S (S ≥ 20) cycle integral average .

Since the traditional backlight and the LCD panel scan synchronously, the backlight switch and the LCD panel scan are always in the same phase for a single pixel point within S cycles. After integration, it can be clearly observed from the curve that there is an inflection point in the RGB curve, that is, the backlight Bright and dark flickering will be captured, reflecting the deterioration of the image quality of the human eye.

Referring to Fig. 3 and Fig. 4, Fig. 3 and Fig. 4 are respectively the phase asynchronous scanning design of the dimming signal of the backlight panel and the image signal of the liquid crystal display panel of the embodiment of the present invention, that is, to adjust the backlight startup time and the backlight driving PWM frequency Finally, it is equipped with the image quality processing function of the movement, corresponding to the two timing diagrams of the single pixel. Wherein, Tr is the rotation time of the liquid crystal switching between two screens.

In order to prevent the blur effect produced by the rotation of the liquid crystal from being perceived by the human eye, generally, within 1/5*Tr time after the start of the rotation of the liquid crystal and before the end of the rotation, it is considered that the state of the liquid crystal is the same as the stable state before the start of the rotation or after the end of the rotation. Therefore, in this interval, the backlight is turned on, and the problem of poor image quality will not be derived.

In this embodiment, in the phase asynchronous design of the backlight and the liquid crystal display panel, in the control of the scanning of the liquid crystal display panel and the start-up time of the backlight, it is necessary to meet the time when the backlight is turned on and the time when the liquid crystal remains in a stable state, that is, the time when the backlight is turned on must be delayed from that of the liquid crystal display panel. The scanning start time of the backlight can be within △T=1/5*Tr time after the liquid crystal starts to rotate (as shown in the timing diagram in Figure 3), or before the time when the liquid crystal ends rotation △T=1/5 *Tr time (as shown in the timing diagram in Figure 4).

Referring to Fig. 5, Fig. 5 is the asynchronous scanning design of the backlight and the liquid crystal display panel of the embodiment of the present invention, equipped with the image quality processing function of the core, and using the MPRT instrument to test the moving picture switching process, a single pixel point S (S ≥ 20) The RGB luminance change curve of the periodic integral average.

As can be seen from Fig. 5, since the backlight of the present invention and the liquid crystal display panel are asynchronous scanning, the scanning phase of the backlight switch and the liquid crystal display panel is always changing for a single pixel point in S periods, and can be observed from the curve after integration There is no inflection point in the RGB curve, that is, the flickering phenomenon of the backlight is optimized by this technology, which reflects that the image quality of the human eye is improved to the best state.

In the liquid crystal display control method and the liquid crystal display of the embodiment of the present invention, after the liquid crystal display is powered on, the image signal scanning of the liquid crystal display panel and the dimming signal scanning of the backlight board are started, so that the image signal of the liquid crystal display panel and the dimming signal of the backlight board are scanned. Phase asynchronous; adjust the scanning frequency A of the backlight dimming signal and the scanning frequency B of the image signal of the liquid crystal display panel, so that the relationship between the scanning frequency A of the backlight dimming signal and the scanning frequency B of the image signal of the liquid crystal display panel satisfies: A>B, and A ≠N*B, where N is an integer greater than 0, thereby avoiding the flickering phenomenon of the backlight relative to the screen scanning, improving the display quality of LCD TVs and other liquid crystal displays, making the product cost-effective and enhancing the market competitiveness of the product .

The above is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or process transformation made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technical fields , are all included in the scope of patent protection of the present invention in the same way.

Claims (10)

1. a liquid crystal display control method, it is characterised in that including:

After liquid crystal display is energized, the dim signal of the picture signal scanning and backlight that start display panels scans,

The phase place of the picture signal of described display panels and the dim signal of backlight is asynchronous；

The relation of the picture signal rate of scanning B of described backlight dimming signal scanning frequency A and display panels meets: A > B, and A ≠ N*B, wherein, N is the integer more than 0.

2. method according to claim 1, it is characterised in that the described dim signal sweep start time is later than the described picture signal sweep start time.

3. method according to claim 2, it is characterized in that, in the first start-up time of backlight of the described backlight 1/5*Tr time after the liquid crystal of described display panels starts rotational instant, wherein, Tr is that the liquid crystal molecule of display panels switches the time rotated between two pictures.

4. method according to claim 1, it is characterized in that, described dim signal sweep start time and described picture signal sweep start time warping, in the first start-up time of backlight of the described backlight 1/5*Tr time before the liquid crystal of described display panels terminates rotational instant, wherein, Tr is that the liquid crystal molecule of display panels switches the time rotated between two pictures.

5. the method according to any one of claim 1-4, it is characterised in that A > B+24HZ.

6. the liquid crystal display controlling liquid crystal display, it is characterised in that including:

Starting module, for after liquid crystal display is energized, the dim signal of the picture signal scanning and backlight that start display panels scans, and the phase place of the picture signal of described display panels and the dim signal of backlight is asynchronous；The relation of the picture signal rate of scanning B of described backlight dimming signal scanning frequency A and display panels meets: A > B, and A ≠ N*B, wherein, N is the integer more than 0.

7. liquid crystal display according to claim 6, it is characterised in that the described dim signal sweep start time is later than the described picture signal sweep start time.

8. liquid crystal display according to claim 7, it is characterized in that, in the first start-up time of backlight of the described backlight 1/5*Tr time after the liquid crystal of described display panels starts rotational instant, wherein, Tr is that the liquid crystal molecule of display panels switches the time rotated between two pictures.

9. liquid crystal display according to claim 7, it is characterized in that, described dim signal sweep start time and described picture signal sweep start time warping, in the first start-up time of backlight of the described backlight 1/5*Tr time before the liquid crystal of described display panels terminates rotational instant, wherein, Tr is that the liquid crystal molecule of display panels switches the time rotated between two pictures.

10. the liquid crystal display according to any one of claim 6-9, it is characterised in that A > B+24HZ.