CN111210790B - Liquid crystal display device for improving moving image display quality - Google Patents
Liquid crystal display device for improving moving image display quality Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3685—Details of drivers for data electrodes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
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Abstract
The invention provides a liquid crystal display device for improving the display quality of a moving image, which comprises a liquid crystal panel, a liquid crystal panel driving unit, an image data judging unit, an image data correcting unit, a light source, a driving unit of the light source and a time schedule controller, wherein the image data judging unit is used for judging whether the input image data is still image data or moving image data, outputting the still image data to a data driver and the light source driving unit, outputting the moving image data to the image data correcting unit, and the image data correcting unit is used for receiving and correcting the moving image data and outputting the corrected moving image data to the data driver and the light source driving unit. The invention realizes the dimming control of the subareas by detecting the subareas of the moving images, effectively improves the display quality of the images, reduces the fuzzy effect of the moving images and reduces the power consumption of equipment.
Description
Technical Field
The invention belongs to the field of liquid crystal display, and particularly relates to a liquid crystal display device for improving the display quality of a moving image.
Background
In recent years, liquid crystal display devices have been widely used in many fields, and continue to exhibit a rapidly increasing trend. Currently, liquid crystal display devices are being developed toward large size, high resolution, wide viewing angle, and high aperture ratio. In recent years, liquid crystal display devices have been widely used in many fields, and continue to exhibit a rapidly increasing trend. In general, a liquid crystal display device is mainly composed of two glass substrates and an anisotropic liquid crystal layer between the two glass substrates. The liquid crystal display panel mainly applies source data signals of pixels to pixel electrodes under the control of gate driving signals to the switching units, and applies reference voltage signals to the reference electrodes, thereby realizing the display of image signals on the liquid crystal panel. Since a moving image is easy to have a display blur problem on a display device relative to a static image, how to effectively improve the moving image display effect is a problem to be solved by the technical scheme of the invention.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a liquid crystal display device for improving the display quality of a moving image, which effectively improves the display quality of the image, reduces the fuzzy effect of the moving image and reduces the power consumption of equipment by detecting the moving image in a subarea way and realizing the dimming control of the subarea; meanwhile, the display effect of the moving image can be improved without storing the current frame data in the frame memory, the number of the frame memories is reduced, and the production cost of the liquid crystal display device is reduced.
The technical solution for realizing the purpose of the invention is as follows:
a liquid crystal display device for improving moving image display quality, comprising: a liquid crystal panel including data signal lines, gate signal lines, pixels connecting the data signal lines and the gate signal lines, and thin film transistors displaying input image signals, for displaying an image; the liquid crystal panel driving unit comprises a gate driver and a data driver, wherein the gate driver is connected with gate signal lines G1 to Gn of the liquid crystal panel and used for providing gate voltage to realize the opening and closing of the gate of the thin film transistor, and the data driver is connected with source signal lines D1 to Dn of the liquid crystal panel and used for providing data voltage to realize the display of pixel gray scale; the output end of the image data judging unit is connected with the data driver, the image data correcting unit and the light source driving unit, and is used for judging whether the input image data is still image data or moving image data, outputting the still image data to the data driver and the light source driving unit, and outputting the moving image data to the image data correcting unit; the output end of the image data correction unit is connected with the data driver and the light source driving unit and used for receiving and correcting the moving image data and outputting the corrected moving image data to the data driver and the light source driving unit; a light source disposed below the liquid crystal panel for providing backlight to the liquid crystal panel; the output end of the light source driving unit is connected with the light source and used for driving the light source according to the data of the image data judging unit and the image data correcting unit and the control signal of the time schedule controller; the light source driving unit comprises a motion area detector, a light source power controller and a light source current controller, wherein the motion area detector receives and compares current frame data and previous frame data of the motion image data, distinguishes a first display area with a motion value larger than a reference value and a second display area with a motion value smaller than the reference value, outputs motion area detection signals corresponding to the first display area and the second display area to the light source power controller and the light source current controller, the light source power controller controls the power of a first part of a light source corresponding to the first display area and the power of a second part of the light source corresponding to the second display area based on the motion area detection signals, and transmitting a luminance signal related to the luminance of the first display region and the second display region to a light source current controller, the light source current controller controlling the current supplied to the first portion and the second portion of the light source based on the motion region detection signal and the luminance signal; and the time sequence controller is used for receiving the control signal and respectively outputting the control signal of the timing control to the grid driver, the data driver and the light source driving unit.
Furthermore, the liquid crystal display device for improving the display quality of the moving image of the invention comprises an image data correction unit, an image data processing unit, a data processing unit and a data processing unit, wherein the input end of the image data correction unit comprises a first frame memory, a second frame memory, an overdrive unit and a replacement unit; the system comprises a first frame memory, a second frame memory, an overdrive unit, a replacement unit and a storage unit, wherein the first frame memory stores current frame data of moving image data, the second frame memory stores previous frame data of the moving image data, the overdrive unit reads the current frame data in the first frame memory and the previous frame data in the second frame memory and outputs overdrive data after overdrive processing, the replacement unit reads the current frame data in the first frame memory and the previous frame data in the second frame memory and generates and outputs replacement data, and the replacement data is output to the second frame memory to replace the original previous frame data.
Further, the liquid crystal display device of the present invention improves the moving image display quality, wherein the number of frames per second of the moving image data inputted to the first frame memory is half of the number of frames per second of the moving image data outputted from the first frame memory and the second frame memory.
Further, according to the liquid crystal display device for improving the display quality of the moving image of the present invention, the second frame memory includes a compression unit, a storage unit, and a restoration unit, which are connected in sequence, the compression unit compresses the input previous frame data and the replacement data, the storage unit stores the compressed previous frame data and the compressed replacement data, and the restoration unit restores the compressed previous frame data and the compressed replacement data and outputs the restored previous frame data and the compressed replacement data to the overdrive unit and the replacement unit.
Further, the liquid crystal display device for improving the display quality of the moving image according to the present invention may further include a first comparator for comparing the current frame data with the previous frame data and outputting a first comparison signal including information of a voltage difference between the current frame data and the previous frame data, a first lookup table for storing overdrive data corresponding to the voltage difference between the current frame data and the previous frame data, and a first correction unit for reading and outputting the overdrive data corresponding to the first comparison signal from the first lookup table.
Further, the liquid crystal display device for improving the display quality of the moving image according to the present invention, wherein the replacing unit includes a second comparator, a second lookup table, and a second correcting unit, the second comparator compares the current frame data with the previous frame data and outputs a second comparison signal, the second comparison signal includes information of a voltage difference between the current frame data and the previous frame data, the second lookup table stores replacement data corresponding to the voltage difference between the current frame data and the previous frame data, the second correcting unit reads and outputs the replacement data corresponding to the second comparison signal from the second lookup table, and the replacement data is obtained by interpolating the current frame data and the previous frame data.
Further, the liquid crystal display device of the present invention improves the moving image display quality, and the light source is a light emitting diode of a point light source or a cold cathode fluorescent lamp of a linear light source.
Further, the liquid crystal display device of the present invention for improving the moving image display quality, wherein the image data judging unit is an external host, the host switches the output interface to connect the image data correcting unit when the input image data is changed from the still image data to the moving image data, and the host switches the output interface to connect the data driver and the light source driving unit when the input image data is changed from the moving image data to the still image data.
Furthermore, the liquid crystal display device for improving the display quality of the moving image comprises an image data correction unit, a frame memory, an overdrive unit and a replacement unit, wherein the input ends of the frame memory, the overdrive unit and the replacement unit are all connected with an external host, the output end of the frame memory is connected with the overdrive unit and the replacement unit, and the output end of the replacement unit is connected with the frame memory; the frame memory stores previous frame data of the moving image data, the overdrive unit receives the current frame data of the moving image data input by the external host and the previous frame data in the frame memory and outputs corrected overdrive data after overdrive processing, the replacement unit receives the current frame data of the moving image data input by the external host and the previous frame data in the frame memory, generates and outputs replacement data, and simultaneously outputs the replacement data to the frame memory to replace the original previous frame data.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
1. the liquid crystal display device for improving the display quality of the moving images can effectively improve the display quality of the images, reduce the blurring effect of the moving images and reduce the power consumption of equipment by carrying out subarea detection on the moving images and realizing the dimming control of subareas.
2. The liquid crystal display device for improving the display quality of the moving image can realize the display effect of the moving image without storing the current frame data in the frame memory, and the number of the frame memories can be reduced and the production cost of the liquid crystal display device can be reduced by adopting the mode.
3. The liquid crystal display device for improving the moving image display quality of the invention adopts the overdrive unit and the replacement unit to output the overdrive data and the replacement data when inputting the moving image data, thereby greatly improving the response speed of the liquid crystal.
Drawings
Fig. 1 is an overall block diagram of a liquid crystal display device for improving moving image display quality according to the present invention.
Fig. 2 is a block diagram of an image data correcting unit of the liquid crystal display device of the present invention for improving the display quality of a moving image.
Fig. 3 is an input and output diagram of the first frame memory of the liquid crystal display device for improving the moving image display quality according to the present invention.
Fig. 4 is a block diagram of a second frame memory of the liquid crystal display device for improving moving image display quality according to the present invention.
Fig. 5 is a block diagram of an overdrive unit of the liquid crystal display device for improving moving image display quality according to the present invention.
Fig. 6 is a block diagram schematically showing an alternative unit of the liquid crystal display device for improving moving image display quality according to the present invention.
Fig. 7 is a block diagram of a light source driving unit of a liquid crystal display device for improving moving image display quality according to the present invention.
Fig. 8 is a block diagram of the whole of embodiment 2 of the liquid crystal display device of the present invention for improving the display quality of a moving image.
Fig. 9 is a schematic diagram of an image data correcting unit of embodiment 2 of the liquid crystal display device of the present invention for improving moving image display quality.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
A liquid crystal display device for improving moving image display quality, comprising:
the liquid crystal panel 100 includes data signal lines, gate signal lines, pixels connecting the data signal lines and the gate signal lines, and thin film transistors displaying input image signals, and displays an image.
The liquid crystal panel driving unit comprises a gate driver 200 and a data driver 300, wherein the gate driver 200 is connected with gate signal lines G1 to Gn of the liquid crystal panel 100 and used for providing gate voltage to realize the opening and closing of the gate of the thin film transistor, and the data driver 300 is connected with source signal lines D1 to Dn of the liquid crystal panel 100 and used for providing data voltage to realize the display of pixel gray scale.
The image data determining unit 400, the output end of which is connected to the data driver 300, the image data correcting unit 500, and the light source driving unit 700, is configured to determine whether the input image data is still image data or moving image data, and output the still image data to the data driver 300 and the light source driving unit 700, and output the moving image data to the image data correcting unit 500.
The image data correction unit 500 has an output terminal connected to both the data driver 300 and the light source driving unit 700, and is configured to receive and correct the moving image data and output the corrected moving image data to the data driver 300 and the light source driving unit 700.
And a light source 600 disposed below the liquid crystal panel 100 for providing a backlight to the liquid crystal panel 100.
A light source driving unit 700 having an output terminal connected to the light source 600, for driving the light source 600 according to the data of the image data judging unit 400, the image data correcting unit 500, and the control signal of the timing controller 800; the light source driving unit comprises a motion area detector, a light source power controller and a light source current controller, wherein the motion area detector receives and compares current frame data and previous frame data of the motion image data, distinguishes a first display area with a motion value larger than a reference value and a second display area with a motion value smaller than the reference value, outputs motion area detection signals corresponding to the first display area and the second display area to the light source power controller and the light source current controller, the light source power controller controls the power of a first part of a light source corresponding to the first display area and the power of a second part of the light source corresponding to the second display area based on the motion area detection signals, and transmitting a luminance signal related to the luminance of the first display region and the second display region to a light source current controller, the light source current controller controlling the current supplied to the first portion and the second portion of the light source based on the motion region detection signal and the luminance signal.
The timing controller 800 is configured to receive the control signal and output the timing-controlled control signal to the gate driver 200, the data driver 300, and the light source driving unit 700, respectively.
Example 1
A liquid crystal display device for improving moving image display quality, as shown in fig. 1, comprising:
the liquid crystal panel 100 includes data signal lines, gate signal lines, pixels connecting the data signal lines and the gate signal lines, and thin film transistors displaying input image signals, and displays an image.
The liquid crystal panel driving unit comprises a gate driver 200 and a data driver 300, wherein the gate driver 200 is connected with gate signal lines G1 to Gn of the liquid crystal panel 100 and used for providing gate voltage to realize the opening and closing of the gate of the thin film transistor, and the data driver 300 is connected with source signal lines D1 to Dn of the liquid crystal panel 100 and used for providing data voltage to realize the display of pixel gray scale.
The image data determining unit 400, the output end of which is connected to the data driver 300, the image data correcting unit 500, and the light source driving unit 700, is configured to determine whether the input image data is still image data st or moving image data mt, and then output the still image data st to the data driver 300 and the light source driving unit 700, and output the moving image data mt to the image data correcting unit 500. By dynamically correcting an image by determining whether input image data is still image data or moving image data, power consumption of the apparatus can be effectively reduced.
The image data correction unit 500, the output end of which is connected to both the data driver 300 and the light source driving unit 700, is configured to receive and correct the moving image data mt, and output the corrected moving image data mt to the data driver 300 and the light source driving unit 700. As shown in fig. 2, the image data correction unit 500 includes a first frame memory 510, a second frame memory 520, an overdrive unit 530, and a replacement unit 540, an input terminal of the first frame memory 510 is connected to the image data determination unit 400, and an output terminal thereof is connected to the second frame memory 520, the overdrive unit 530, and the replacement unit 540, an output terminal of the second frame memory 520 is connected to the overdrive unit 530 and the replacement unit 540, an output terminal of the overdrive unit 530 and an output terminal of the replacement unit 540 collectively serve as an output terminal of the image data correction unit 500, and an output terminal of the replacement unit 540 is connected to the second frame memory 520. Wherein the first frame memory 510 stores current frame data Fn of moving image data, the second frame memory 520 stores previous frame data Fn-1 of the moving image data, and the number of frames per second of the moving image data input to the first frame memory 510 is half of the number of frames per second of the moving image data output from the first frame memory 510 and the second frame memory 520.
As shown in fig. 4, the second frame memory 520 includes a compressing unit 521, a storing unit 522 and a restoring unit 523 connected in sequence, the compressing unit 521 compresses the input previous frame data Fn-1 and the replacement data R-Fn before the previous frame data Fn-1 and the replacement data R-Fn are stored in the second frame memory 520, the storing unit 522 stores the compressed previous frame data Fn-1 and the replacement data R-Fn, and the restoring unit 523 restores the compressed previous frame data Fn-1 and the replacement data R-Fn and outputs to the overdrive unit 530 and the replacing unit 540. The overdrive unit 530 reads the current frame data Fn in the first frame memory 510 and the previous frame data Fn-1 in the second frame memory 520 and outputs the overdrive data O-Fn through the overdrive process.
As shown in fig. 5, the overdrive unit 530 includes a first comparator 531, a first lookup table 532 and a first correction unit 533, the first comparator 531 comparing the current frame data Fn with the previous frame data Fn-1 and outputting a first comparison signal C1, the first comparison signal C1 containing information of a voltage difference between the current frame data Fn and the previous frame data Fn-1, the first lookup table 532 storing overdrive data corresponding to the voltage difference between the current frame data Fn and the previous frame data Fn-1, the first correction unit 533 reading and outputting the overdrive data O-Fn corresponding to the first comparison signal C1 from the first lookup table 532. The replacement unit 540 reads the current frame data Fn in the first frame memory 510 and the previous frame data Fn-1 in the second frame memory 520, and then generates and outputs the replacement data R-Fn while outputting the replacement data R-Fn to the second frame memory 520 to replace the previous frame data Fn-1, which may help reduce the difference of the overdrive data O-Fn due to the previous frame data Fn-1 in this manner since the replacement data R-Fn is changed to a new previous frame data per frame. For example, when the voltage of the previous frame data Fn-1 is less than the voltage of the current frame data Fn, the voltage value of the overdrive data O-Fn is greater than the voltage value of the previous frame data Fn-1. If the voltage of the previous frame data Fn-1 is greater than the voltage value of the current frame data Fn, the voltage value of the overdrive data O-Fn is less than the voltage value of the current frame data Fn. Accordingly, outputting the overdriven data O-Fn to the data driver 300 and applying the overdriven data voltage to the data lines of the liquid crystal panel 100 through the data driver 300 can greatly improve the response speed of the liquid crystal.
As shown in fig. 6, the replacing unit 540 includes a second comparator 541, a second lookup table 542, and a second correcting unit 543, the second comparator 541 compares the current frame data Fn with the previous frame data Fn-1 and outputs a second comparison signal C2, the second comparison signal C2 includes information of a voltage difference between the current frame data Fn and the previous frame data Fn-1, the second lookup table 542 stores replacement data R-Fn corresponding to the voltage difference between the current frame data Fn and the previous frame data Fn-1, and the second correcting unit 543 reads and outputs the replacement data R-Fn corresponding to the second comparison signal C2 from the second lookup table 542, the replacement data R-Fn being obtained by interpolating the current frame data Fn and the previous frame data Fn-1. Accordingly, the nth overdrive data O-Fn and the replacement data R-Fn are output based on the nth frame data Fn and the (n-1) th frame data Fn-1. In the above manner, the image correction unit 500 causes the n +1 th frame data Fn +1 of the moving image to be stored in 510, the replacement data R-Fn of the n-th frame to be stored in 520, and outputs the overdrive data O-Fn + 1 of the n +1 th frame and the replacement data R-Fn + 1 of the n +1 th frame. When moving image data is input, the response speed of the liquid crystal can be improved by outputting overdrive data and replacement data.
As shown in fig. 3, the number of frames per second (fps) of the moving image data mt input to the first frame memory 510 is set to be half the number of frames per second of the moving image data output from the first frame memory 510 and the second frame memory 520. During the first frame (0 ms to 16.7 ms), the moving image data mt is input into the first frame memory 510 at a rate of 60fps, and the n-th frame data IN-Fn is stored IN the first frame memory 510. The n-th frame data IN-Fn IN the first frame memory 510 is output after the delay of the field, i.e., from the (n + 0.5) -th frame, i.e., the n-th frame data IN-Fn stored IN the first frame memory 510 is output during the 8.3ms to 16.7ms field. The data (OUT-Fn + 0.5) output from the n +0.5 th frame is obtained by internally interpolating data input during 0ms to 8.3ms and data input during 8.3ms to 16.7ms from the n-th frame data Fn in the first frame memory 510, and the result of the interpolation is output between 8.3ms to 16.7 ms. The n +1 th frame data (OUT-Fn +1) is internally differentiated by the n +1 th frame data (IN-Fn +1) inputted into the first frame memory 510 between 16.7ms and 25ms and the n-th frame data (IN-Fn +1) inputted into the first frame memory 510 between 8.3ms and 16.7ms, and the result is outputted between 16.7ms and 25 ms. Therefore, the moving image data output from the first frame memory 510 may have a rate of 120 fps.
And a light source 600 disposed below the liquid crystal panel 100 for providing a backlight to the liquid crystal panel 100. The light source 600 is a point light source light emitting diode or a linear light source cold cathode fluorescent lamp.
The light source driving unit 700, the output end of which is connected to the light source 600, drives the light source 600 according to the data of the image data judging unit 400, the image data correcting unit 500, and the control signal of the timing controller 800. As shown in fig. 7, the light source driving unit 700 includes a motion region detector 710, a light source power controller 720, and a light source current controller 730, the motion region detector 710 receives and compares current frame data Fn and previous frame data Fn-1 of moving image data mt, distinguishes a first display region having a motion value greater than a reference value and a second display region having a motion value less than the reference value, outputs a motion region detection signal M1 corresponding to the first display region and the second display region to the light source power controller 720, the light source current controller 730, the light source power controller 720 controls power of a first portion of the light source 600 corresponding to the first display region and power of a second portion of the light source 600 corresponding to the second display region based on the motion region detection signal M1, and transmits a luminance signal h1 related to luminance of the first display region and the second display region to the light source current controller 730, the light source current controller 730 controls the current supplied to the first and second portions of the light source 600 based on the motion region detection signal M1 and the luminance signal h1, and the current supplied to the first portion of the light source 600 is greater than the current supplied to the second portion of the light source 600 under the control of the light source current controller 730. Thus, the light source power controller 720 provides the first dimming signal to the first portion of the light source 600 and the second dimming signal to the second portion of the light source 600. The duty cycle of the first dimming signal may be smaller than the duty cycle of the second dimming signal. The first portion of the light source 600 flickers, and at this time, the light source power controller 720 controls the flicking period by controlling the duty ratio of the first dimming signal, and the brightness of the first display region corresponding to the first portion of the light source 600 is reduced by the flickers. The light source power controller 720 does not perform a blinking operation for the second display region having the motion value less than the reference value. Accordingly, by the light source power controller 720, it is possible to reduce motion blur of an image and to display the image more clearly. In addition, power consumption can be reduced by selectively performing a blinking operation on the first portion of the light source 600, and the light source current controller 730 compensates for a problem of a decrease in brightness due to the blinking operation performed on the first portion of the light source 600. The driving frequency of the liquid crystal device when displaying still image data is half of the driving frequency of the liquid crystal device when displaying moving image data, and for example, when the driving frequency of the liquid crystal device displaying still image data is 60Hz, the driving frequency of the liquid crystal device displaying moving image data is 120 Hz.
The timing controller 800 is configured to receive a control signal Ctr and output a first control signal Ctr1, a second control signal Ctr2, and a third control signal Ctr3 to the gate driver 200, the data driver 300, and the light source driving unit 700, respectively, where the first control signal Ctr1 controls the gate driver 200 to turn on and off the gate signal lines of the panel row by row, the second control signal Ctr2 controls the source driver 300 to control writing of the pixel data voltage, the third control signal Ctr3 is output to the light source driving unit 700 to control normal operation of the light source driving unit 700, and the third control signal Ctr3 further includes a horizontal synchronization signal.
Example 2
A liquid crystal display device for improving moving image display quality, as shown in fig. 8, comprising:
the liquid crystal panel 100 includes data signal lines, gate signal lines, pixels connecting the data signal lines and the gate signal lines, and thin film transistors displaying input image signals, and displays an image.
The liquid crystal panel driving unit comprises a gate driver 200 and a data driver 300, wherein the gate driver 200 is connected with gate signal lines G1 to Gn of the liquid crystal panel 100 and used for providing gate voltage to realize the opening and closing of the gate of the thin film transistor, and the data driver 300 is connected with source signal lines D1 to Dn of the liquid crystal panel 100 and used for providing data voltage to realize the display of pixel gray scale.
And an image data determining unit, an output end of which is connected to the data driver 300, the image data correcting unit 500, and the light source driving unit 700, for determining whether the input image data is still image data st or moving image data mt, and then outputting the still image data st to the data driver 300 and the light source driving unit 700, and outputting the moving image data mt to the image data correcting unit 500. The image data judging unit is an external host 900, the host 900 switches the output interface to connect the image data correcting unit 500 when the input image data is changed from the still image data st to the moving image data mt, and the host 900 switches the output interface to connect the data driver 300, the light source driving unit 700 when the input image data is changed from the moving image data mt to the still image data st, that is, the host 900 outputs one of the moving image data mt data and the still image data st data.
The image data correction unit 500' has an output terminal connected to both the data driver 300 and the light source driving unit 700, and is configured to receive and correct the moving image data and output the corrected moving image data to the data driver 300 and the light source driving unit 700. The image data correction unit 500' includes a frame memory 550, an overdrive unit 530 and a replacement unit 540, wherein the input terminals of the frame memory 550, the overdrive unit 530 and the replacement unit 540 are all connected to the external host 900, the output terminal of the frame memory 550 is connected to the overdrive unit 530 and the replacement unit 540, and the output terminal of the replacement unit 540 is connected to the frame memory 550; the frame memory 550 stores previous frame data Fn-1 of the moving image data, the overdrive unit 530 receives the current frame data Fn of the moving image data input from the external host 900 and the previous frame data Fn-1 in the frame memory 550 and outputs corrected overdrive data through overdrive processing, and the replacement unit 540 receives the current frame data Fn of the moving image data input from the external host 900 and the previous frame data Fn-1 in the frame memory 550 and generates and outputs replacement data, and outputs the replacement data to the frame memory 550 to replace the previous frame data Fn-1. The image data correction unit 500 'allows the overdrive unit 530 to directly use the current frame data Fn of the moving image data mt, and thus can reduce the number of frame memories 550 of the image data correction unit 500'. As shown in fig. 8 and 9, the liquid crystal device driving frequency of the still image data st is the same as the driving frequency of the moving image data mt. When the liquid crystal device driving frequency for displaying the still image data st is 60Hz, the display moving image device driving frequency is also 60 Hz. Further, the number of frames per second of the moving image data mt input to the frame memory 550 is the same as the number of frames output from the frame memory 550. The number of frames per second of the moving image data mt input to the frame memory 550 may be 60fps, 120fps, or 180 fps. The number of frames per second of the moving image data mt output from the frame memory 550 may be 60fps, 120fps, or 180fps, corresponding to the number of frames per second of the moving image data mt input to the frame memory 550. As shown in fig. 9, when the image data correction unit 500' outputs the correction data, it is not necessary to store the current frame data in the frame memory 550, and thus, in this way, it is possible to reduce the number of frame memories 550 and to reduce the production cost of the liquid crystal display device.
And a light source 600 disposed below the liquid crystal panel 100 for providing a backlight to the liquid crystal panel 100.
The light source driving unit 700, the output end of which is connected to the light source 600, drives the light source 600 according to the data of the image data judging unit 400, the image data correcting unit 500, and the control signal of the timing controller 800. The light source driving unit comprises a motion area detector, a light source power controller and a light source current controller, wherein the motion area detector receives and compares current frame data and previous frame data of the motion image data, distinguishes a first display area with a motion value larger than a reference value and a second display area with a motion value smaller than the reference value, outputs motion area detection signals corresponding to the first display area and the second display area to the light source power controller and the light source current controller, the light source power controller controls the power of a first part of a light source corresponding to the first display area and the power of a second part of the light source corresponding to the second display area based on the motion area detection signals, and transmitting a luminance signal related to the luminance of the first display region and the second display region to a light source current controller, the light source current controller controlling the current supplied to the first portion and the second portion of the light source based on the motion region detection signal and the luminance signal.
The timing controller 800 is configured to receive the control signal and output the timing-controlled control signal to the gate driver 200, the data driver 300, and the light source driving unit 700, respectively.
This may cause some problems when a moving image is displayed using the liquid crystal display device because of the characteristics of the response speed and the liquid crystal molecule retentivity of the liquid crystal in the liquid crystal display device. The liquid crystal display device may use a Dynamic Capacitance Compensation (DCC) technique to achieve an increased response speed of the liquid crystal. Through DCC technology, the following modes are provided to realize the quick response speed of the liquid crystal: and finishing the correction of the data of the current frame by adopting the data of the current frame and the data of the previous frame. In addition, the liquid crystal display device using the DCC technology requires the use of a frame memory storing frame data, and the increase of the frame memory may cause the production cost of the liquid crystal display device to increase the complexity of production and manufacture. Further, although this way can improve the response speed of the liquid crystal, motion blur may occur due to the characteristics of the liquid crystal hold type display device. Therefore, the technical scheme of the device for improving the image display effect can reduce the motion blur of the image, display the image more clearly and effectively reduce the power consumption of the display equipment.
The foregoing is directed to embodiments of the present invention and, more particularly, to a method and apparatus for controlling a power converter in a power converter, including a power converter, a power.
Claims (8)
1. A liquid crystal display device for improving moving image display quality, comprising:
a liquid crystal panel (100) including data signal lines, gate signal lines, pixels connecting the data signal lines and the gate signal lines, and thin film transistors displaying input image signals, for displaying an image;
the liquid crystal panel driving unit comprises a gate driver (200) and a data driver (300), wherein the gate driver (200) is connected with gate signal lines G1 to Gn of the liquid crystal panel (100) and used for providing gate voltage to realize the on and off of the gate of the thin film transistor, and the data driver (300) is connected with source signal lines D1 to Dn of the liquid crystal panel (100) and used for providing data voltage to realize the display of pixel gray scale;
the output end of the image data judging unit (400) is connected with the data driver (300), the image data correcting unit (500) and the light source driving unit (700) and is used for judging whether the input image data is still image data or moving image data, then outputting the still image data to the data driver (300) and the light source driving unit (700) and outputting the moving image data to the image data correcting unit (500);
the output end of the image data correction unit (500) is connected with the data driver (300) and the light source driving unit (700) and is used for receiving and correcting the moving image data and outputting the corrected moving image data to the data driver (300) and the light source driving unit (700); the image data correction unit (500) comprises a first frame memory (510), a second frame memory (520), an overdrive unit (530) and a replacement unit (540), wherein the input end of the first frame memory (510) is connected with the image data judgment unit (400), the output end of the first frame memory is connected with the second frame memory (520), the overdrive unit (530) and the replacement unit (540), the output end of the second frame memory (520) is connected with the overdrive unit (530) and the replacement unit (540), the output end of the overdrive unit (530) and the output end of the replacement unit (540) are jointly used as the output end of the image data correction unit (500), and the output end of the replacement unit (540) is connected with the second frame memory (520); wherein, the first frame memory (510) stores the current frame data of the motion image data, the second frame memory (520) stores the previous frame data of the motion image data, the overdrive unit (530) reads the current frame data in the first frame memory (510) and the previous frame data in the second frame memory (520) and outputs the overdrive data after the overdrive processing, the replacement unit (540) reads the current frame data in the first frame memory (510) and the previous frame data in the second frame memory (520) and generates and outputs the replacement data, and outputs the replacement data to the second frame memory (520) to replace the original previous frame data;
a light source (600) disposed below the liquid crystal panel (100) for providing backlight to the liquid crystal panel (100);
a light source driving unit (700) having an output terminal connected to the light source (600) for driving the light source (600) according to the data of the image data judging unit (400), the image data correcting unit (500) and the control signal of the timing controller (800); the light source driving unit (700) includes a motion region detector (710), a light source power controller (720), and a light source current controller (730), the motion region detector (710) receives and compares current frame data and previous frame data of the corrected moving image data, discriminates a first display region having a motion value greater than a reference value and a second display region having a motion value less than the reference value, outputs a motion region detection signal corresponding to the first display region and the second display region to the light source power controller (720), the light source current controller (730), the light source power controller (720) controls power of a first portion of the light source (600) corresponding to the first display region and power of a second portion of the light source (600) corresponding to the second display region based on the motion region detection signal, and transmits a luminance signal related to luminance of the first display region and the second display region to the light source current controller (730), a light source current controller (730) controls currents supplied to the first and second portions of the light source (600) based on the motion region detection signal and the luminance signal;
and the time sequence controller (800) is used for receiving the control signals and respectively outputting the control signals for timing control to the gate driver (200), the data driver (300) and the light source driving unit (700).
2. The liquid crystal display device for improving moving image display quality according to claim 1, wherein the number of frames per second of the moving image data inputted to the first frame memory (510) is half of the number of frames per second of the moving image data outputted from the first frame memory (510) and the second frame memory (520).
3. The liquid crystal display device for improving moving image display quality according to claim 1, wherein the second frame memory (520) includes a compression unit (521), a storage unit (522), and a restoration unit (523) connected in sequence, the compression unit (521) compresses the input previous frame data and the replacement data, the storage unit (522) stores the compressed previous frame data and the replacement data, and the restoration unit (523) restores the compressed previous frame data and the replacement data and outputs the restored previous frame data and the replacement data to the overdrive unit (530) and the replacement unit (540).
4. The liquid crystal display device for improving the display quality of a moving image according to claim 1, wherein the overdrive unit (530) includes a first comparator (531), a first lookup table (532), and a first correction unit (533), the first comparator (531) comparing the current frame data with the previous frame data and outputting a first comparison signal, the first comparison signal containing information of a voltage difference between the current frame data and the previous frame data, the first lookup table (532) storing overdrive data corresponding to the voltage difference between the current frame data and the previous frame data, the first correction unit (533) reading and outputting the overdrive data corresponding to the first comparison signal from the first lookup table (532).
5. The liquid crystal display device for improving the display quality of a moving image according to claim 1, wherein the replacement unit (540) includes a second comparator (541), a second lookup table (542), and a second correction unit (543), the second comparator (541) compares the current frame data with the previous frame data and outputs a second comparison signal including information of a voltage difference between the current frame data and the previous frame data, the second lookup table (542) stores replacement data corresponding to the voltage difference between the current frame data and the previous frame data, and the second correction unit (543) reads out from the second lookup table (542) and outputs the replacement data corresponding to the second comparison signal, the replacement data being obtained by interpolating the current frame data and the previous frame data.
6. The liquid crystal display device for improving moving image display quality according to claim 1, wherein the light source (600) is a point light source light emitting diode or a linear light source cold cathode fluorescent lamp.
7. The liquid crystal display device for improving moving image display quality according to claim 1, wherein the image data judging unit (400) is an external host (900), the host (900) switches the output interface to the connection image data correcting unit (500) when the input image data is changed from the still image data to the moving image data, and the host (900) switches the output interface to the connection data driver (300) and the light source driving unit (700) when the input image data is changed from the moving image data to the still image data.
8. A liquid crystal display device for improving moving image display quality, comprising:
a liquid crystal panel (100) including data signal lines, gate signal lines, pixels connecting the data signal lines and the gate signal lines, and thin film transistors displaying input image signals, for displaying an image;
the liquid crystal panel driving unit comprises a gate driver (200) and a data driver (300), wherein the gate driver (200) is connected with gate signal lines G1 to Gn of the liquid crystal panel (100) and used for providing gate voltage to realize the on and off of the gate of the thin film transistor, and the data driver (300) is connected with source signal lines D1 to Dn of the liquid crystal panel (100) and used for providing data voltage to realize the display of pixel gray scale;
the output end of the image data judging unit (400) is connected with the data driver (300), the image data correcting unit (500) and the light source driving unit (700) and is used for judging whether the input image data is still image data or moving image data, then outputting the still image data to the data driver (300) and the light source driving unit (700) and outputting the moving image data to the image data correcting unit (500);
the output end of the image data correction unit (500) is connected with the data driver (300) and the light source driving unit (700) and is used for receiving and correcting the moving image data and outputting the corrected moving image data to the data driver (300) and the light source driving unit (700); the image data correction unit (500) comprises a frame memory (550), an overdrive unit (530) and a replacement unit (540), wherein the input ends of the frame memory (550), the overdrive unit (530) and the replacement unit (540) are connected with an external host (900), the output end of the frame memory (550) is connected with the overdrive unit (530) and the replacement unit (540), and the output end of the replacement unit (540) is connected with the frame memory (550); the frame memory (550) stores previous frame data of the moving image data, the overdrive unit (530) receives the current frame data of the moving image data input by the external host (900) and the previous frame data in the frame memory (550) and outputs corrected overdrive data after overdrive processing, the replacement unit (540) receives the current frame data of the moving image data input by the external host (900) and the previous frame data in the frame memory (550), generates and outputs replacement data, and outputs the replacement data to the frame memory (550) to replace the original previous frame data;
a light source (600) disposed below the liquid crystal panel (100) for providing backlight to the liquid crystal panel (100);
a light source driving unit (700) having an output terminal connected to the light source (600) for driving the light source (600) according to the data of the image data judging unit (400), the image data correcting unit (500) and the control signal of the timing controller (800); the light source driving unit (700) includes a motion region detector (710), a light source power controller (720), and a light source current controller (730), the motion region detector (710) receives and compares current frame data and previous frame data of the corrected moving image data, discriminates a first display region having a motion value greater than a reference value and a second display region having a motion value less than the reference value, outputs a motion region detection signal corresponding to the first display region and the second display region to the light source power controller (720), the light source current controller (730), the light source power controller (720) controls power of a first portion of the light source (600) corresponding to the first display region and power of a second portion of the light source (600) corresponding to the second display region based on the motion region detection signal, and transmits a luminance signal related to luminance of the first display region and the second display region to the light source current controller (730), a light source current controller (730) controls currents supplied to the first and second portions of the light source (600) based on the motion region detection signal and the luminance signal;
and the time sequence controller (800) is used for receiving the control signals and respectively outputting the control signals for timing control to the gate driver (200), the data driver (300) and the light source driving unit (700).
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