CN104050931A - Method for reducing trailing phenomenon of liquid crystal screen and liquid crystal display device - Google Patents
Method for reducing trailing phenomenon of liquid crystal screen and liquid crystal display device Download PDFInfo
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Abstract
The invention discloses a method for reducing a trailing phenomenon of a liquid crystal screen and a liquid crystal display device. Therefore, a pheromone of display trailing of the existing liquid crystal screen in the prior art can be avoided. The method comprises: backlight of a backlight module group is divided into at least two segments and each segment of backlight corresponds to one segment of liquid crystal screen; and within the time for scanning one frame of image, only the segment of scanned backlight corresponding to the segment of liquid crystal screen is turned on. The device at least includes an SOC main board, a TCON board, a liquid crystal screen, an LED drive unit and LED backlight; the LED backlight is divided into multiple segments and each segment of backlight corresponds to one segment of liquid crystal screen; and the TCON board outputs a control signal, so that only the segment of scanned backlight corresponding to the segment of liquid crystal screen is turned on within the time for scanning one frame of image. According to the invention, on the basis of the segmented backlight zone mode, backlight in corresponding areas at the backlight area of the liquid crystal screen are only turned on at corresponding specific time, thereby effectively reducing the motion image trailing phenomenon of the television set.
Description
Technical Field
The invention relates to a television and an image display processing technology, in particular to a method for reducing a trailing phenomenon of a liquid crystal display and a liquid crystal display device.
Background
With the development of the television industry, people have increasingly pursued visual impact effects for television viewing. Whether the image moving at high speed can be clearly displayed is the focus of attention of consumers and is also the focus of research and development personnel to explore and improve.
The smear phenomenon is a phenomenon in which the edge of the display device appears hairy and the details are not clearly seen when displaying a moving image. The trailing phenomenon generally exists in the current liquid crystal display television, which is determined by the light-emitting principle and the liquid crystal response time of the liquid crystal display television. Although the liquid crystal display has been developed to solve the problem of the smear, it has not been possible to solve the problem for a long time.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a method for reducing a tailing phenomenon of a liquid crystal display and a liquid crystal display device, which effectively reduce the tailing phenomenon of the liquid crystal display.
In order to achieve the above object, the present invention provides a method for reducing the tailing phenomenon of a liquid crystal display, which divides the backlight of a backlight module into at least two segments, wherein each segment of backlight corresponds to a segment of liquid crystal display, and only the segment of backlight corresponding to the currently scanned segment of liquid crystal display is turned on within the time period for scanning a frame of image.
Preferably, when the starting position of the current segment of the liquid crystal screen is scanned, a synchronization signal is output to turn on the corresponding segment of the LED backlight, and when the segment of the liquid crystal screen is scanned, the synchronization signal is output to turn off the corresponding segment of the LED backlight.
Preferably, the time for scanning each frame of image is divided into a plurality of time periods according to the number of backlight segments, and each segment of liquid crystal screen is scanned in sequence in a fixed time period; and simultaneously, outputting a synchronous signal according to the time period to turn on the corresponding LED backlight of the segment.
Preferably, the backlight of the liquid crystal display panel is divided into 3 or 6 segments.
Preferably, the scanned current segment backlight is turned on two or more times in the corresponding required scanning time.
In order to achieve the above object, the present invention provides a liquid crystal display device for reducing the tailing phenomenon of a liquid crystal panel, comprising at least a SOC main board, a TCON board, a liquid crystal panel, an LED driving unit and an LED backlight, wherein,
the SOC mainboard sends an LVDS signal to the TCON board;
the TCON board receives and processes the LVDS signals and then sends STV signals to the LED driving unit; simultaneously sending a driving signal to the liquid crystal display to control scanning;
the LED driving unit receives the STV signal processing and sends a backlight control signal to the LED backlight to open the backlight;
wherein,
the LED backlight is divided into a plurality of sections, and each section of backlight corresponds to one section of liquid crystal screen;
the TCON board outputs a control signal to enable only the section of backlight corresponding to the section of the liquid crystal screen scanned currently to be turned on within the time used by scanning one frame of image.
Preferably, the first and second electrodes are formed of a metal,
when the TCON board scans the initial position of the liquid crystal screen of the current segment, the TCON board outputs a synchronous signal to be sent to the LED driver to turn on the corresponding segment of LED backlight, and when the TCON board scans the segment of liquid crystal screen, the TCON board outputs a synchronous signal to be sent to the LED driver to turn off the corresponding segment of LED backlight.
Preferably, the first and second electrodes are formed of a metal,
dividing the time used for scanning each frame of image into a plurality of time segments according to the segment number of the backlight;
when the TCON board receives the frame synchronization signal, the liquid crystal screens of all the sections are scanned in sequence, and meanwhile, the synchronization signal is output to the LED drive according to the time period to turn on the corresponding LED backlight of the section.
Preferably, the STV signal is transmitted only once during the time it takes to scan each frame of image.
The invention has the beneficial effects that:
the invention uses the backlight area segmentation mode to ensure that the area corresponding to the backlight area on the liquid crystal screen only lights the backlight in the corresponding specific time, the brightness reduction caused by the backlight scanning is compensated by the lifting current, and the flicker caused by the backlight scanning is compensated by the lifting of the backlight partition and the reduction of the backlight opening time. The motion image tailing phenomenon of the television is effectively reduced, and compared with the television with higher input screen refreshing rate, the display effect of the low tailing phenomenon is realized by using the liquid crystal screen with low cost; meanwhile, the flicker phenomenon caused by scanning is reduced by utilizing multiple partitions of the backlight.
Drawings
FIG. 1 is a schematic diagram of a backlight scanning in which a backlight area is divided into three segments according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating a segment of a backlight scanning twice according to an embodiment of the present invention;
FIG. 3 is a comparison chart of the backlight before and after scanning according to an embodiment of the present invention;
fig. 4 is a system block diagram of a method for reducing a tailing phenomenon of a liquid crystal display according to an embodiment of the present invention.
Detailed Description
The invention is further described with reference to the accompanying drawings.
The smear phenomenon is a phenomenon in which the edge of the display device appears hairy and the details are not clearly seen when displaying a moving image. The trailing phenomenon generally exists in the current liquid crystal display television, which is determined by the light-emitting principle and the liquid crystal response time of the liquid crystal display television.
In view of the above situation, the method for reducing the trailing phenomenon of the liquid crystal display panel of the present invention comprises: the backlight of the backlight module is divided into a plurality of sections, each section of backlight corresponds to one section of liquid crystal screen, and only the section of backlight corresponding to the section of liquid crystal screen scanned currently is turned on within the time for scanning one frame of image. The method provides a scanning backlight to realize the phase-change black insertion effect, thereby solving the problems of brightness darkening and flickering. In short, during the time taken for scanning one frame of image, the corresponding area on the liquid crystal screen only lights up the backlight within a specific time. For a better understanding of the principle, some embodiments are explained here:
example 1:
the specific steps of this example are as follows:
1. dividing a backlight area of a display screen into a plurality of sections; for example, the number of the LED light bars may be divided, and assuming that the number of the LED light bars is 6 arranged from top to bottom, the backlight area may be divided into 2, 3 or 6 from top to bottom. The display screen corresponding to each backlight area is also divided into 2, 3 or 6 areas.
2. Dividing the time taken by one frame of image into 2, 3 or 6 time segments according to the number of segments of the backlight area;
3. each segment of the display screen is scanned in top-to-bottom order (or vice versa) while the backlight areas are turned on in time-sequential order.
It is convenient to understand that the following description is given in terms of specific embodiments:
as shown in fig. 1, the screen is divided into 3 parts from top to bottom in the time of one frame image, and when the nth frame image is displayed, the first section of backlight is turned on at time t1, the second section of backlight is turned on at time t2, and the third section of backlight is turned on at time t 3; the next frame image is used to temporarily, i.e. at time t4, re-illuminate the first segment of backlight. Therefore, when the image goes from the nth frame to the N +1 th frame, the first segment of backlight is not bright, i.e., it is equivalent to phase-change black insertion, during the period from t2 to t 3. As can be seen from fig. 1, the backlight scanning corresponds to black insertion for a certain period of time within one frame image.
According to the method of the above embodiment 1, it is possible to realize: and only the section of backlight corresponding to the section of the currently scanned liquid crystal screen is turned on, so that the phase-change black insertion effect can be realized, and the problems of brightness darkening and flickering are solved. Since the total time of one frame of image is fixed, the more the backlight segments are, the shorter the backlight on-time of each segment is, and the lower the corresponding brightness is. At this time, the LED driving current needs to be increased to compensate for the decrease in LED brightness.
Generally, the matching relationship between the backlight on time and the liquid crystal inversion is: the rising time and the falling time of the liquid crystal response are 3.4ms and 5.85ms, the value range of the rising time and the falling time is 10% -90% of the maximum amplitude of the liquid crystal, and the hold area of the liquid crystal is the area between the rising time and the falling time. The liquid crystal is considered to have turned over in this area, and the backlight should theoretically be turned on in this area for optimum effect. The more the liquid crystal turning time corresponding to the area for lighting the current segment of backlight is matched with the backlight opening time, the better the scanning effect is. Since the turning time of the liquid crystal on the screen from top to bottom is different, the matching is completed by opening the corresponding backlight after the liquid crystal is turned over.
Through verification, when the backlight area is divided into more than six sections, the current boost multiple of the LED is too high, so that the service life of the light bar is influenced; when the partition is less than six segments, the liquid crystal turning time of the backlight and the liquid crystal turning time of the corresponding area cannot be well matched, and the improvement effect is not obvious, so that the optimal scanning mode of six segments of backlight can be adopted.
In order to solve the problem of screen flicker, the screen flicker occurring in the corresponding lighting process of the multiple backlight areas needs to be lighted twice or more in the corresponding backlight area section in a time period of one frame of image every time a time period passes. This is further illustrated below in connection with example 2:
example 2:
the following are the specific control steps for this embodiment:
1. dividing a backlight area of a display screen into a plurality of sections;
2. dividing the time used by one frame of image into time sections, wherein the number of the time sections is the same as the number of the sections divided by the backlight area;
3. in the time used by one frame of image, every time a time period passes, the corresponding backlight area segments are correspondingly lightened in sequence, and the corresponding backlight areas are lightened twice or more in the time period.
It is convenient to understand that the following description is given in terms of specific embodiments:
as shown in fig. 1, during one frame of image, the screen is divided into 3 parts from top to bottom, and when the nth frame of image is displayed, after the first section of backlight is lit for the first time within t1, the first section of backlight is lit again after a certain time delay; lighting the second section of backlight within t2, and lighting the second section of backlight again after a certain time delay; and lighting the third section of backlight within t3, and after a certain time delay, lighting the third section of backlight again.
As shown in fig. 2, t1 is the time taken for the liquid crystal corresponding to the first segment backlight to turn over the hold region, and the first segment backlight should be turned on within t 1. Similarly, the second segment of backlight should be turned on at t2, and the third segment of backlight should be turned on at t 3. It can be seen in the figure that each segment of the backlight is turned on once and twice during scanning within the corresponding time, and the timing relationship of the backlight scanning can be obtained from the figure.
According to the method of the embodiment 2, it can also be realized that only the segment of the backlight corresponding to the currently scanned segment of the liquid crystal screen is turned on, so that the phase-change black insertion effect can be realized, and the problems of brightness darkening and flickering are solved. As shown in fig. 3 for a comparison before and after backlight scanning. Wherein, the left side of each group of column diagrams is the trailing effect before backlight scanning, and the right side is the trailing effect after backlight scanning. The abscissa is nine points of the screen and the ordinate is the response time. Since the tail is determined by the liquid crystal response time, the rise time and the fall time of the liquid crystal response at nine points of the screen before and after backlight scanning are measured as a comparison. As can be seen from the figure, the liquid crystal rise time in the non-scanning backlight is greater than that in the scanning backlight for 7 points; meanwhile, the liquid crystal falling time in the non-scanning backlight is 8 points longer than that in the scanning backlight. The average time of rising of the liquid crystal when the backlight is not scanned is 6.97ms, and the average time of falling of the liquid crystal when the backlight is not scanned is 8.23 ms; the average time for liquid crystal to rise in scanning backlight was 4.51ms, and the average time for liquid crystal to fall in scanning backlight was 4.77 ms. The contrast data shows that the tailing effect is greatly improved after backlight scanning is carried out.
In order to solve the problem of the trailing phenomenon of the television, the liquid crystal display device for reducing the trailing phenomenon of the liquid crystal screen at least comprises an SOC main board, a TCON board, the liquid crystal screen of the television with 60Hz refresh rate, an LED driving unit and an LED backlight, wherein,
the SOC mainboard sends an LVDS signal to the TCON board;
the TCON board receives and processes the LVDS signals and then sends STV signals to the LED driving unit; simultaneously sending a driving signal to the liquid crystal display to control scanning;
the LED driving unit receives the STV signal processing and sends a backlight control signal to the LED backlight to open the backlight;
wherein,
the LED backlight is divided into a plurality of sections, and each section of backlight corresponds to one section of liquid crystal screen;
the TCON board outputs a control signal to enable only the section of backlight corresponding to the section of the liquid crystal screen scanned currently to be turned on within the time used by scanning one frame of image.
The above-described liquid crystal display device can be implemented in various ways, and will now be described with reference to two embodiments.
Example 3:
as shown in fig. 4, the SOC motherboard sends an LVDS signal to the TCON board, when the TCON board scans the initial position of the current segment of the liquid crystal display, the TCON board outputs a synchronization signal to the LED driver to turn on the corresponding segment of the LED backlight, and when the segment of the liquid crystal display is scanned, the TCON board outputs a synchronization signal to the LED driver to turn off the corresponding segment of the LED backlight.
Specifically, referring to fig. 1 and fig. 2, in the time of one frame of image, the screen is divided into 3 parts from top to bottom, when the nth frame (current frame) of image is displayed, starting from time t1, the TCON board outputs a signal to scan the initial position of the first segment of liquid crystal screen at the beginning of time t1, and simultaneously outputs a synchronization signal to the LEDs to drive and turn on the corresponding first segment of LED backlight; when the section of the liquid crystal screen is scanned, the time t1 is over, and the TCON board outputs a synchronous signal to be sent to the LED driver to turn off the section of the LED backlight.
At the moment, the time t2 starts simultaneously, the TCON board outputs a signal to scan the initial position of the second section of liquid crystal screen when the time t2 starts, and simultaneously outputs a synchronous signal to be sent to the LED to drive and turn on the corresponding second section of LED backlight; when the section of the liquid crystal screen is scanned, the time t2 is over, and the TCON board outputs a synchronous signal to be sent to the LED drive to turn off the second section of the LED backlight.
When the time t2 is over, the time t3 is started, the TCON board outputs a signal to scan the initial position of the third section of liquid crystal screen when the time t3 is started, and simultaneously outputs a synchronous signal to the LED to drive and turn on the corresponding third section of LED backlight; when the section of the liquid crystal screen is scanned completely, the time t3 is over, the TCON board outputs a synchronous signal to be sent to the LED driver to turn off the third section of the LED backlight, and at the moment, the frame of image is completely scanned completely.
Followed by the TCON board output signal to display the N +1 th frame. Starting from t1 time of the (N + 1) th frame, the TCON board outputs signals to scan the initial position of the first section of liquid crystal screen when starting from t1 time of the (N + 1) th frame, and simultaneously outputs synchronous signals to the LEDs to drive and turn on the corresponding first section of LED backlight; when the section of the liquid crystal screen is scanned, the time t1 is over, and the TCON board outputs a synchronous signal to be sent to the LED driver to turn off the section of the LED backlight. t2 begins at the same time, and repeats.
In this embodiment, each segment of the backlight area is turned on or off according to the start and end positions of the display screen scanned by the TCON board.
Example 4:
in this embodiment, the time used for scanning each frame of image is divided into a plurality of fixed time periods according to the number of backlight segments, and the TCON board turns on each backlight region according to the fixed time period specifically as follows:
the SOC mainboard sends LVDS signals to the TCON board, when the TCON board receives frame synchronization signals, the TCON board scans all sections of liquid crystal screens in sequence, and simultaneously outputs the synchronization signals to the LED drive according to a fixed time period to turn on the corresponding section of LED backlight. The principle of this embodiment is that, since the time taken for each frame of image is fixed,
the number of the segments into which the display screen is divided is also fixed, so that the time for scanning each segment of the display screen is also fixed, and therefore, the TCON board can also realize the method only by outputting the synchronization signal according to the fixed time segment to turn on the corresponding segment of the LED backlight when only the frame synchronization signal is received, and the TCON board does not need to judge the scanning position of the current segment of the display screen.
Generally, the chip for controlling the backlight is a single MCU. The chip controls the backlight scanning in the 3D state. The chip judges the 3D state by receiving a VSYNC signal from the TCON board, and controls the scanning of the backlight according to the chip program to realize the 3D effect. The invention changes the judgment signal from VSYNC to STV signal, the STV signal is a signal sent from TCON board in 2D state, the signal is sent once per frame image, through the program setting of chip, when receiving the STV signal, the backlight starts scanning.
As can be seen from the above, in this embodiment, the liquid crystal panel scans are the same as in embodiment 3, and are all sequential scans, for example: from top to bottom or from bottom to top (or from left to right or from right to left); in contrast, each segment of the backlight area is lit at a fixed (specific) time regardless of the position scanned by the liquid crystal panel. This may reduce the complexity of the system.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (10)
1. A method for reducing the trailing phenomenon of a liquid crystal screen is characterized in that the backlight of a backlight module is divided into at least two sections, each section of backlight corresponds to one section of liquid crystal screen, and in the time for scanning one frame of image, only the section of backlight corresponding to the section of liquid crystal screen scanned currently is turned on.
2. The method of claim 1, wherein when the start position of the current segment of the lcd panel is scanned, a synchronization signal is outputted to turn on the corresponding segment of the LED backlight, and when the segment of the lcd panel is scanned, a synchronization signal is outputted to turn off the corresponding segment of the LED backlight.
3. The method for reducing the tailing phenomenon of the liquid crystal screen according to claim 1, characterized in that the time for scanning each frame of image is divided into a plurality of time periods according to the number of backlight segments, and each liquid crystal screen is sequentially scanned in a fixed time period; and simultaneously, outputting a synchronous signal according to the time period to turn on the corresponding LED backlight of the segment.
4. The method of claim 1, wherein the backlight of the LCD panel is divided into 3 segments or 6 segments.
5. The method of claim 1, wherein the scanned current segment backlight is turned on twice or more within a corresponding required scanning time.
6. A liquid crystal display device for reducing the trailing phenomenon of a liquid crystal screen at least comprises an SOC main board, a TCON board, the liquid crystal screen, an LED drive unit and an LED backlight, wherein,
the SOC mainboard sends an LVDS signal to the TCON board;
the TCON board receives and processes the LVDS signals and then sends STV signals to the LED driving unit; simultaneously sending a driving signal to the liquid crystal display to control scanning;
the LED driving unit receives the STV signal processing and sends a backlight control signal to the LED backlight to open the backlight;
it is characterized in that the preparation method is characterized in that,
the LED backlight is divided into a plurality of sections, and each section of backlight corresponds to one section of liquid crystal screen;
the TCON board outputs a control signal to enable only the section of backlight corresponding to the section of the liquid crystal screen scanned currently to be turned on within the time used by scanning one frame of image.
7. The liquid crystal display device for reducing the tailing phenomenon of the liquid crystal screen according to claim 6, wherein specifically:
when the TCON board scans the initial position of the liquid crystal screen of the current segment, the TCON board outputs a synchronous signal to be sent to the LED driver to turn on the corresponding segment of LED backlight, and when the TCON board scans the segment of liquid crystal screen, the TCON board outputs a synchronous signal to be sent to the LED driver to turn off the corresponding segment of LED backlight.
8. The liquid crystal display device for reducing the tailing phenomenon of the liquid crystal screen according to claim 6, wherein specifically:
dividing the time used for scanning each frame of image into a plurality of time segments according to the segment number of the backlight;
when the TCON board receives the frame synchronization signal, the liquid crystal screens of all the sections are scanned in sequence, and meanwhile, the synchronization signal is output to the LED drive according to the time period to turn on the corresponding LED backlight of the section.
9. The LCD device of claim 6, wherein the STV signal is transmitted only once during the time taken for each frame of image scanning.
10. The LCD device of claim 6, wherein the LCD panel is a 60Hz refresh rate TV LCD panel.
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| CN106205497A (en) * | 2015-04-29 | 2016-12-07 | 青岛海信电器股份有限公司 | A kind of method for controlling backlight thereof, device and liquid crystal indicator |
| CN106981272A (en) * | 2017-05-26 | 2017-07-25 | 京东方科技集团股份有限公司 | Backlight driving method, device and the display panel of display panel |
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