CN101046941B - Apparatus and method for driving liquid crystal display device - Google Patents

Apparatus and method for driving liquid crystal display device Download PDF

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Publication number
CN101046941B
CN101046941B CN200610152489XA CN200610152489A CN101046941B CN 101046941 B CN101046941 B CN 101046941B CN 200610152489X A CN200610152489X A CN 200610152489XA CN 200610152489 A CN200610152489 A CN 200610152489A CN 101046941 B CN101046941 B CN 101046941B
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signal
video data
synchronizing signal
cycle
frequency
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CN101046941A (en
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尹相昌
金宰圣
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LG Display Co Ltd
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LG Display Co Ltd
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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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/36—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of a graphic pattern, e.g. using an all-points-addressable [APA] memory
    • G09G5/363—Graphics controllers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/00006—Changing the frequency
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/06—Details of flat display driving waveforms
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/08—Details of timing specific for flat panels, other than clock recovery
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/12—Frame memory handling

Abstract

An apparatus and method for driving a liquid crystal display (LCD) device is disclosed, to prevent error of a timing controller and to prevent the defective image on a frequency conversion, the apparatus comprising a liquid crystal display part to display images, a driver to drive the liquid crystal display part, a graphic system to output frequency-conversion prediction information in accordancewith a frequency-conversion signal, and perform frequency conversion of a plurality of synchronizing signals, and a timing controller to control the driver to display video data according to a previous frame during the frequency conversion, in response to the frequency-conversion prediction information.

Description

Be used to drive the apparatus and method of liquid crystal display device
The application requires application number in application on March 30th, 2006 to be P2006-028981 and to be the rights and interests of the korean patent application of P2006-081519 at the application number of application on August 28th, 2006, quote this two patented claims in this mode, as illustrating fully at this by reference.
Technical field
The application relates to a kind of apparatus and method that are used to drive liquid crystal display (LCD) device, is used to prevent time schedule controller maloperation when frequency inverted, prevents defective imaged image thus.
Background technology
Usually, liquid crystal display (LCD) device shows various images according to the transmittance of controlling by the driving liquid crystal.The LCD device comprises the liquid crystal display component of display image and the driving circuit of control liquid crystal display component.In more detail, liquid crystal display component comprises: a plurality of sub-pixels that form picture element matrix; Drive a plurality of thin film transistor (TFT)s of described sub-pixel respectively; Control many grid lines of described thin film transistor (TFT) respectively; And many data lines that data are provided to described thin film transistor (TFT) respectively.Driving circuit comprises: the gate driver that drives the grid line of liquid crystal display component; Drive the data driver of the data line of liquid crystal display component; And the time schedule controller of control gate driver and data driver.In this case, time schedule controller is arranged from the video data of outside input, and the video data after will arranging provides to data driver.And time schedule controller is by using from a plurality of synchronizing signal control gate drivers of outside input and the driving sequential of data driver.
In the LCD of correlation technique device, the screen change of display image in for the driving frequency transfer process that obtains low-power consumption.For example,, then a plurality of synchronizing signals are carried out frequency modulation to be suitable for the frame frequency of 50Hz, then described signal is provided to time schedule controller if the frame-rate conversion of 60Hz is become the frame frequency of 50Hz.The time schedule controller utilization has the synchronizing signal of modulation back frequency and comes control gate driver and data driver, and liquid crystal display component shows the image with 50Hz frame frequency thus.
But when the conversion frame frequency, the frequency instability of synchronizing signal causes the maloperation of time schedule controller thus.Therefore, in liquid crystal display component, show unsettled image, perhaps in liquid crystal display component, show " no signal " message to cause defective imaged image thus.
Summary of the invention
Therefore, the present invention relates to a kind of apparatus and method that are used to drive the LCD device, it is eliminated because the restriction of relevant technologies and one or more problems that defective causes.
An object of the present invention is to provide a kind of apparatus and method that are used to drive the LCD device,, prevent defective imaged image thus to prevent time schedule controller maloperation when the frequency inverted.
Additional advantage of the present invention, purpose and a characteristics part will be illustrated in the following description, and a part become apparent when studying hereinafter for those of ordinary skills, perhaps can understand from the practice of the present invention.Purpose of the present invention and other advantage can realize by the structure that particularly points out in printed instructions and claims and the accompanying drawing and obtain.
In order to realize these purposes and other advantage and according to purpose of the present invention, as this concrete implements and broadly described, a kind of device that is used to drive the LCD device comprises: liquid crystal display component is used for display image; Driver is used to drive this liquid crystal display component; Graphics system, be used to provide video data and a plurality of synchronizing signal, produce the first selection signal relevant according to frequency conversion signal, after producing this first selection signal, respond the frequency of this frequency conversion signal conversion synchronization signal then with the frequency inverted information of forecasting from the outside input; And time schedule controller, be used for responding this and first select signal and one of at least detect the unstable cycle from described synchronizing signal, if do not detect the unstable cycle, then control this driver and on this liquid crystal display component, show normal video data; If detect the unstable cycle, then produce and be used to indicate second of this instability cycle to select signal, respond this second selection signal, when inversion frequency, control this driver shows former frame on this liquid crystal display component video data, wherein this time schedule controller comprises: synchronous signal detection unit, be used for responding this and first select signal and one of at least detect this instability cycle, and produce this and second select signal from described synchronizing signal; Oscillator is used to produce internal clocking; The synchronizing signal selected cell is used to respond this and second selects signal and optionally export described synchronizing signal or this internal clocking; Control signal generating unit is used for producing a plurality of control signals that are used to control this driver by using described synchronizing signal or this internal clocking from this synchronizing signal selected cell; Frame memory is used to respond this and first selects signal and store video data from the former frame of this graphics system, and responds this and second select signal and export institute's video data stored; And video data processing unit, be used to arrange video data from this graphics system, export the video data after arranging to this driver, respond this and second select signal and arrange video data, and the video data after will arranging exports this driver to from the former frame of this frame memory.
In another program of the present invention, a kind of device that is used to drive liquid crystal display device comprises: liquid crystal display component is used for display image; Driver is used to drive this liquid crystal display component; Graphics system, be used to provide video data and a plurality of synchronizing signal, produce the option data relevant according to frequency conversion signal, after producing described option data, respond the frequency of this frequency conversion signal conversion synchronization signal then with the frequency inverted information of forecasting from the outside input; And time schedule controller, be used to respond this option data and produce the first selection signal, responding this first selects signal and detect one of at least the unstable cycle from described synchronizing signal, if do not detect the unstable cycle, then control this driver and on this liquid crystal display component, show normal video data; If detect the unstable cycle, then produce and be used to indicate second of this instability cycle to select signal, respond this second selection signal, when inversion frequency, control this driver shows former frame on this liquid crystal display component video data, wherein this time schedule controller comprises: the option determining unit is used to respond described option data and produces this first selection signal; Synchronous signal detection unit is used for responding this and first selects signal one of at least to detect this instability cycle from described synchronizing signal, and produces this and second select signal; Oscillator is used to produce internal clocking; The synchronizing signal selected cell is used to respond this and second selects signal and optionally export described synchronizing signal or this internal clocking; Control signal generating unit is used for producing a plurality of control signals that are used to control this driver by using described synchronizing signal or this internal clocking from this synchronizing signal selected cell; Frame memory is used to respond this and first selects signal and store video data from the former frame of this graphics system, and responds this and second select signal and export institute's video data stored; And video data processing unit, be used to arrange video data from this graphics system, export the video data after arranging to this driver, to export this option determining unit to according to the isolated option data of this mark, respond this and second select signal and arrange video data, and the video data after will arranging exports this driver to from the former frame of this frame memory.
This graphics system comprises: video data provides the unit, is used to provide described video data; The synchronizing signal generation unit is used to export described a plurality of synchronizing signal, responds the frequency that this frequency conversion signal is changed described synchronizing signal; And the frequency inverted determining unit, be used to respond this frequency conversion signal and produce and export this first selection signal.
This graphics system comprises: video data provides the unit, is used to provide described video data, and responds the mark that this frequency conversion signal produces described option data and is used to indicate whether to exist described option data; And the synchronizing signal generation unit, be used to export described a plurality of synchronizing signal, and respond the frequency that this frequency conversion signal is changed described synchronizing signal.
This instability cycle that this synchronous signal detection unit one of detects in the described synchronizing signal at least, and enable this and second select signal.
This synchronous signal detection unit is counted the data enable signal from described synchronizing signal according to Dot Clock, detects the unstable cycle of described data enable signal thus.
If import this internal clocking, then this control signal generating unit produces at least one synchronizing signal by using this internal clocking and the information of depositing, and by using this internal clocking and at least one synchronizing signal to produce described control signal.
The video data of described former frame is the video data before enabling this second selection signal.
Under the state of buffering from the video data of this graphics system, this frame memory exports described video data to this video data processing unit, under the state of the video data of the former frame of storing keeping this first selection signal of response, this frame memory provides enabling the cycle to this second selection signal with the video data of this former frame.
In another program of the present invention, a kind of device that is used to drive the LCD device comprises: liquid crystal display component is used for display image; Driver is used to drive this liquid crystal display component; Graphics system, be used to provide video data and a plurality of synchronizing signal, produce the first selection signal relevant according to frequency conversion signal, after producing this first selection signal, respond the frequency of this frequency conversion signal conversion synchronization signal then with the frequency inverted information of forecasting from the outside input; And time schedule controller, be used for responding this and first select signal and one of at least detect the unstable cycle from described synchronizing signal, if do not detect the unstable cycle, then control this driver and on this liquid crystal display component, show normal video data; If detect the unstable cycle, then produce and be used to indicate second of this instability cycle to select signal, prevent to drive this driver, thereby respond this second selection signal, when inversion frequency, control this driver shows former frame on this liquid crystal display component video data, wherein this time schedule controller comprises: synchronous signal detection unit is used for responding this and first selects signal and one of at least detect this instability cycle from described synchronizing signal, and produces this and second select signal; Control signal generating unit is used for by using described synchronizing signal to produce a plurality of control signals that are used to control this driver; The synchronizing signal selected cell is used to respond this and second selects signal and export described synchronizing signal to this control signal generating unit, perhaps cuts off described synchronizing signal; And the video data processing unit, be used to arrange video data, and the video data after will arranging exports this driver to from this graphics system.
In another program of the present invention, a kind of device that is used to drive liquid crystal display device comprises: liquid crystal display component is used for display image; Driver is used to drive this liquid crystal display component; Graphics system, be used to provide video data and a plurality of synchronizing signal, produce the option data relevant according to frequency conversion signal, after producing described option data, respond the frequency of this frequency conversion signal conversion synchronization signal then with the frequency inverted information of forecasting from the outside input; And time schedule controller, be used to respond described option data and produce the first selection signal, responding this first selects signal and detect one of at least the unstable cycle from described synchronizing signal, if do not detect the unstable cycle, then control this driver and on this liquid crystal display component, show normal video data; If detect the unstable cycle, then produce and be used to indicate second of this instability cycle to select signal, prevent to drive this driver, thereby respond this second selection signal, when inversion frequency, control this driver shows former frame on this liquid crystal display component video data, wherein this time schedule controller comprises: the option determining unit is used to respond described option data and produces this first selection signal; Synchronous signal detection unit is used for responding this and first selects signal one of at least to detect this instability cycle from described synchronizing signal, and produces this and second select signal; Control signal generating unit is used for by using described synchronizing signal to produce a plurality of control signals that are used to control this driver; The synchronizing signal selected cell is used to respond this and second selects signal and described synchronizing signal is provided to this control signal generating unit, perhaps cuts off the input of described synchronizing signal; And the video data processing unit, be used to arrange video data, and the video data after will arranging exports this driver to from this graphics system.
This liquid crystal display component keeps and shows the image of former frame when inversion frequency.
In another program of the present invention, a kind of method that is used to drive the LCD device comprises: produce frequency conversion signal; Respond this frequency conversion signal, produce the first selection signal relevant with the frequency inverted information of forecasting; After producing this first selection signal, respond this frequency conversion signal, the frequency of conversion synchronization signal; Responding this first selects signal and detect one of at least the unstable cycle from described synchronizing signal; Generation is used to indicate second of this instability cycle to select signal; Respond this second selection signal and optionally export described synchronizing signal or internal clocking; By using described synchronizing signal or this internal clocking, produce a plurality of control signals; Respond this and first select signal and store video data, and respond this and second select signal and export institute's video data stored from the former frame of this graphics system; If do not detect the unstable cycle, then on this liquid crystal display component, show normal video data; And if detect the unstable cycle, then respond this and second select signal, when inversion frequency, on this liquid crystal display component, show the video data of former frame.
In another program of the present invention, a kind of method that is used to drive the LCD device comprises: produce frequency conversion signal; Respond this frequency conversion signal, produce and the corresponding option data of frequency inverted information of forecasting; After producing described option data, respond this frequency conversion signal, the frequency of conversion synchronization signal; Respond described option data, produce first and select signal; Responding this first selects signal and detect one of at least the unstable cycle from described synchronizing signal; Generation is used to indicate second of this instability cycle to select signal; Respond this second selection signal and optionally export described synchronizing signal or internal clocking; By using described synchronizing signal or this internal clocking, produce a plurality of control signals; Respond this and first select signal and store video data, and respond this and second select signal and export institute's video data stored from the former frame of this graphics system; If do not detect the unstable cycle, then on this liquid crystal display component, show normal video data; And if detect the unstable cycle, then respond this and second select signal, when inversion frequency, on this liquid crystal display component, show the video data of former frame.
Described method also comprises: after producing option data, produce the mark that is used to indicate whether to exist described option data; And export this mark and option data null cycle to the effective period of described video data.
In another program of the present invention, a kind of method that is used to drive the LCD device comprises: produce frequency conversion signal; Respond this frequency conversion signal, produce the first selection signal relevant with the frequency inverted information of forecasting; After producing this first selection signal, respond this frequency conversion signal, the frequency of conversion synchronization signal; Responding this first selects signal and detect one of at least the unstable cycle from described synchronizing signal; Generation is used to indicate second of this instability cycle to select signal; By using described synchronizing signal, produce a plurality of control signals; Respond this second selection signal and export described synchronizing signal, perhaps cut off described synchronizing signal; If do not detect the unstable cycle, then on this liquid crystal display component, show normal video data; And if detect the unstable cycle, then respond this and second select signal, cut off the input of at least one synchronizing signal that is used to produce a plurality of control signals, and when inversion frequency, on this liquid crystal display component, keep and show the video data of former frame.
In another program of the present invention, a kind of method that is used to drive liquid crystal display device comprises: produce frequency conversion signal; Respond this frequency conversion signal, produce the option data relevant with the frequency inverted information of forecasting; After producing described option data, respond this frequency conversion signal, the frequency of conversion synchronization signal; Respond described option data and produce the first selection signal; Respond this and first select signal, from described synchronizing signal, detect one of at least the unstable cycle; Generation is used to indicate second of this instability cycle to select signal; By using described synchronizing signal, produce a plurality of control signals; Respond this and second select signal and be provided for producing the described synchronizing signal of a plurality of control signals, perhaps cut off the input of described synchronizing signal; If do not detect the unstable cycle, then on this liquid crystal display component, show normal video data; And if detect the unstable cycle, then respond this and second select signal, cut off the input of at least one synchronizing signal that is used to produce a plurality of control signals, and when inversion frequency, on this liquid crystal display component, show the video data of former frame.
Here, be breaking at the input of described synchronizing signal mid point clock signal in the cycle in this frequency inverted.
Should be understood that above-mentioned general description of the present invention and following specifying are exemplary and indicative, and be used to provide desired further explanation of the present invention.
Description of drawings
The accompanying drawing that the present invention includes is used to provide further understanding of the present invention, in conjunction with in this application and the accompanying drawing that constitutes the application's part show embodiments of the invention, and be used from explanation principle of the present invention with instructions one.In the accompanying drawings:
Fig. 1 illustrates the device that is used to drive the LCD device according to of the present invention;
Fig. 2 illustrates the process flow diagram that is used to drive the method for LCD device according to of the present invention;
Fig. 3 illustrates the graphics system and the time schedule controller of first embodiment of the invention;
Fig. 4 illustrates the I/O waveform of the time schedule controller shown in Fig. 3;
Fig. 5 illustrates graphics system and time schedule controller second embodiment of the invention;
Fig. 6 illustrates the I/O waveform of the time schedule controller shown in Fig. 5;
Fig. 7 illustrates according to the graphics system of the 3rd embodiment of the present invention and time schedule controller; And
Fig. 8 illustrates according to the graphics system of the 4th embodiment of the present invention and time schedule controller.
Embodiment
Describe preferred implementation of the present invention now in detail, wherein accompanying drawing shows example of the present invention.In the case of any possible, identical Reference numeral will be used to refer to identical and similar parts in whole accompanying drawing.
The apparatus and method that are used to drive the LCD device according to of the present invention are described below with reference to accompanying drawings.
Fig. 1 illustrates the device that is used to drive the LCD device according to of the present invention.
As shown in Figure 1, according to the inventive system comprises the graphics system 150 that LCD unit and being arranged on is used to control the inside computer system of LCD unit.The LCD unit comprises: the liquid crystal display component 110 of display image; Drive the data driver 120 of the data line (DL1 to DLm) of liquid crystal display component 110; Drive the gate driver 130 of the grid line (GL1 to GLn) of liquid crystal display component 110; And the time schedule controller 140 that is connected with graphics system 150, be used for control data driver 120 and gate driver 130.
Graphics system 150 provides time schedule controller 140 to the LCD unit with a plurality of synchronizing signals and the video data that is suitable for the corresponding resolution of LCD unit.The driving sequential of a plurality of synchronizing signal control LCD unit.That is to say that synchronizing signal comprises: Dot Clock signal (DCLK) is used for determining that video data sends speed; Data enable signal (DE) is used to the information that provides relevant with the effective period of video data; Horizontal-drive signal (Hsync) is used to provide and the information that horizontal synchronizing cycle is relevant; And vertical synchronizing signal (Vsync), be used to provide and the information that vertical sync period is relevant.Synchronizing signal provides to time schedule controller 140.
Simultaneously, graphics system 150 can only produce Dot Clock signal (DCLK) and data enable signal (DE), because data enable signal (DE) comprises the time sequence information of level and vertical synchronizing signal (Hsync, Vsync), so graphics system 150 provides described Dot Clock signal (DCLK) and data enable signal (DE) to time schedule controller 140.In order to reduce electromagnetic interference (EMI), graphics system 150 is compressed into serial data (SD) with video data (RGB) and synchronizing signal, and serial data (SD) is provided to time schedule controller 140.But, unpressed Dot Clock signal (DCLK) is provided separately to time schedule controller 140.
If from the outside to graphics system 150 incoming frequency switching signals (fs), the frequency of conversion synchronization signal then, and it is provided to time schedule controller 140.Especially, response frequency switching signal (fs) is before the frequency of conversion synchronization signal, graphics system 150 produce can the predict frequency conversion option data and control signal, then option data or the control signal that is produced provided to time schedule controller 140.In other words, before the frequency of conversion synchronization signal, graphics system 150 produces the frequency inverted information of forecasting, and the frequency inverted information of forecasting is provided to time schedule controller 140.Therefore, time schedule controller 140 can be prepared subsequently operation according to frequency inverted, and can not produce any problem and maloperation.If user command frequency inverted or to stop or standby mode shows that predetermined image to reduce energy consumption, then produces frequency conversion signal (fs), and it is provided to graphics system 150 in computer system.
Time schedule controller 140 is reduced into video data and synchronizing signal according to the Dot Clock signal (DCLK) that provides from graphics system 150 with serial data (SD).And time schedule controller 140 is arranged video datas being suitable for data driver 120, and the video data after will arranging provides to data driver 120.Time schedule controller 140 produces data and grid-control system signal (DCS, GCS) by using synchronizing signal, and described data and grid-control system signal (DCS, GCS) are provided respectively to data driver 120 and gate driver 130.
In addition, if from the frequency inverted information of forecasting of graphics system 150 to time schedule controller 140 input such as control signal or option data, then the video data from the last frame of graphics system 150 outputs is kept at the frame memory of time schedule controller 140.At this moment, last frame represents to be right after that frame before frame-rate conversion.For example, when in graphics system 150 first frame-rate conversion being become second frame frequency, last frame is represented the frame that driven by first frame frequency.
Simultaneously, if cushion in the frame memory of time schedule controller 140 and use from the video data of graphics system 140 outputs, then time schedule controller 140 response frequency conversion estimation information are not stored last frame video data afterwards thus.During inversion frequency, will be stored in the last frame in the frame memory in the unstable cycle of synchronizing signal in graphics system 150, that is, the video data of former frame provides to data driver 120.At this moment, use from the internal clocking of oscillator (OSC) output of time schedule controller 140 and replace using unsettled synchronizing signal to produce grid-control system signal (GCS) and data controlling signal (DCS) from graphics system 150 outputs.Then, time schedule controller 140 utilizes control signal (GCS, DCS) control gate driver 130 and the data driver 120 that produces, to continue to show the image of former frame in the process of inversion frequency.
Simultaneously, time schedule controller 140 stops to produce grid and data controlling signal (GCS, DCS) in the process of inversion frequency, do not drive gate driver 130 and data driver 120.Therefore, in liquid crystal display component 110, continue the image of the charging of maintenance former frame.For this reason, after incoming frequency conversion estimation information, time schedule controller 140 prevents to produce control signal (GCS, DCS) in the unstable cycle input point clock signal (DCLK) of synchronizing signal to hinder.
If import stable synchronizing signal according to finishing of graphics system 150 medium frequencys conversions, then time schedule controller 140 produces data controlling signal (DCS) and grid-control system signal (GCS) by the synchronizing signal that use has the frequency after the conversion.Therefore, utilize data and grid-control system signal (DCS, GCS) control data and gate driver 120,130 with the frequency after the conversion.That is to say, drive liquid crystal display component 110, display image thus by the frame frequency after the conversion.
Response is from the grid-control system signal (GCS) of time schedule controller 140 outputs, and gate driver 130 produces scanning impulse, and order drives the grid line (GL1 to GLn) of liquid crystal display component 110 thus.
Response is from the data controlling signal (DCS) of time schedule controller 140 outputs, and data driver 120 latchs from the video data of time schedule controller 140 outputs.Then, convert the video data that latchs to the analog video data signal, and provide data line (DL1 to DLm) to liquid crystal display component 110 with the analog video data signal.That is to say that data driver 120 is selected the corresponding gamma electric voltage of gray level with video data, and selected gamma electric voltage is provided to data line (DL1 to DLm).And at each horizontal cycle that scanning impulse is provided to grid line (GL1 to GLn), data driver 120 provides and a video data signal that horizontal line is corresponding to data line (DL1 to DLm).
Liquid crystal display component 110 comprises: " n " bar grid line (GL1 to GLn); " m " bar data line (DL1 to DLm); Be formed on a plurality of thin film transistor (TFT)s (TFT) in each pixel region that limits by grid line and data line; And the pixel electrode that is connected with thin film transistor (TFT) (TFT) respectively, be used to drive liquid crystal molecule.
Thin film transistor (TFT) (TFT) response will provide to pixel electrode from the data-signal of data line (DL) output from the scanning impulse of grid line (GL) output.Pixel electrode and public electrode (Vcom) form liquid crystal capacitor (Clc) to drive liquid crystal.And pixel electrode and last grid line are overlapping, form holding capacitor (Cst) thus.At this moment, pixel electrode can be overlapping to form holding capacitor (Cst) with additional concentric line.Liquid crystal capacitor (Clc) and holding capacitor (Cst) keep being applied to the data-signal of pixel electrode before next data-signal of input.
Fig. 2 illustrates the process flow diagram that is used to drive the method for LCD device according to of the present invention, describes with reference to the LCD device shown in Fig. 1.
If incoming frequency switching signal fs not in step S2, graphics system 150 execution in step S4 then, thus normal video data and synchronizing signal are provided to time schedule controller 140, liquid crystal display component 110 shows normal pictures thus.
Simultaneously, if in step S2 from outside incoming frequency switching signal fs, graphics system 150 execution in step S6 then, thus produce the frequency inverted predicted data of control signal or option-datatype, and it is provided to time schedule controller 140.
In step S6, response frequency conversion estimation information, time schedule controller 140 is stored in the video data of the respective frame before the conversion frame frequency in the graphics system 150 in the frame memory, perhaps keeps the video data of depositing of former frame.
In step S8, graphics system 150 response frequency switching signal fs, thus the frequency of conversion synchronization signal provides synchronizing signal to time schedule controller 140 then to be fit to selected frame frequency.
In step S10, response frequency conversion estimation information, time schedule controller 140 detects because the unstable cycle of at least one synchronizing signal that the frequency-conversion operation of graphics system 150 causes.At this moment, before the unstable cycle of detecting synchronizing signal, execution in step S4, thus time schedule controller 140 outputs show normal picture thus from the normal video data that graphics system 150 provides on liquid crystal display component 110.
If in step S10, detect because the unstable cycle of the synchronizing signal that the frequency-conversion operation of graphics system 150 causes, execution in step S12 then, thereby the video data of the former frame that time schedule controller 140 outputs are stored in frame memory, the image of demonstration former frame on liquid crystal display component 110 thus.On the contrary, if detect the unstable cycle of synchronizing signal, time schedule controller 140 stops to produce grid-control system signal GCS and the data controlling signal DCS that provides to gate driver 130 and data driver 120.In this case, because time schedule controller 140 is not exported grid-control system signal GCS and data controlling signal DCS, so liquid crystal display component 110 keeps and show the image of the charging of former frame.
If in step S10, finish and make synchronizing signal stable owing to the frequency inverted of graphics system 150, execution in step S4 then, thereby time schedule controller 140 outputs show normal picture thus from the normal data that graphics system 150 provides on liquid crystal display component 110.
In the apparatus and method that are used for driving the LCD device according to the present invention, graphics system 150 response frequency conversion estimation information, internal clocking when using frame-rate conversion and the video data of former frame operation liquid crystal display component 110, thus the maloperation of time schedule controller 140 and relatively poor picture quality can be prevented.And at this device that is used for driving the LCD device, liquid crystal display component 110 does not drive gate driver 130 and data driver 120 and keeps the image of former frame when frame-rate conversion, prevent defective image thus.
Fig. 3 illustrates the graphics system and the time schedule controller of first embodiment of the invention.
As shown in Figure 3, the graphics system according to first embodiment of the invention comprises that video data provides unit 151, synchronizing signal generation unit 152, frequency inverted determining unit 153 and data transmission unit 154.In this case, the expanded display recognition data (EDID) from computer system or the output of LCD unit is stored in the internal memory (not shown) of graphics system 150.EDID comprises the information relevant with resolution, data layout and the frame frequency of LCD unit.
Video data provides unit 151 to arrange from the video data of outside input being suitable for driving the LCD unit, and the video data after will arranging provides to data transmission unit 154.Synchronizing signal generation unit 152 produces a plurality of synchronizing signals (DCLK, Hsync, Vsync, DE) according to EDID, and the synchronizing signal that produces is provided to data transmission unit 154.If from outside incoming frequency switching signal (fs), then synchronizing signal generation unit 152 is selected frame frequency to be converted among the EDID, the frequency of conversion synchronization signal to be being fit to selected frame frequency, and the synchronizing signal that will have a frequency after the conversion provides to data transmission unit 154.
Data transmission unit 154 will provide the video data of unit 151 output and be compressed into serial data (SD) from the synchronizing signal (Hsync, Vsync, DE) of synchronizing signal generation unit 152 outputs from video data, data after the compression are provided to time schedule controller 140, and unpressed Dot Clock signal (DCLK) is provided.For example, data transmission unit 154 is compressed into serial data such as Low Voltage Differential Signal (LVDS) and transition minimized differential signal (TMDS) with video data and synchronizing signal (Hsync, Vsync, DE), and described serial data (SD) is provided.
Frequency inverted determining unit 153 response frequency switching signals (fs) produce the first selection signal (CS1) information-related with frequency predication, and the first selection signal (CS1) that will produce provide to time schedule controller 140.
As shown in Figure 3, time schedule controller 140 comprises Data Receiving unit 141, frame memory 142, video data processing unit 143, synchronous signal detection unit 144, synchronizing signal selected cell 145, control signal generating unit 146 and oscillator (hereinafter being called " OSC ") 147.
Data Receiving unit 141 will be reduced into video data and synchronizing signal (Hsync, Vsync, DE) from the serial data (SD) that graphics system 150 receives together with Dot Clock signal (DCLK), parallel then output video data and synchronizing signal.And, the Dot Clock signal (DCLK) that 141 outputs of Data Receiving unit are not reduced.
Synchronous signal detection unit 144 detects the unstable cycle of the synchronizing signal that produces in the process of conversion frame frequency in graphics system 150, that is, and and the cycle of conversion frame frequency.In more detail, if input is selected signal (CS1) from first of graphics system 150 output, then synchronous signal detection unit 144 one of is checked in the synchronizing signals (Hsync, Vsync, DE) at least, thereby detects its unstable cycle.For example, select signal (CS1) if import first, then synchronous signal detection unit 144 detects the unstable cycle of data enable signal (DE), and produces the second selection signal (CS2) that is used to indicate the detected unstable cycle.At this moment, synchronous signal detection unit 144 is counted the quantity of data enable signal (DE) by using Dot Clock signal (DCLK) or internal clock signal (ICLK).If the quantity behind the counting exceeds term of reference, then preferably be considered as the unstable cycle, produce second thus and select signal (CS2).
Based on selecting signal (CS2) from second of synchronous signal detection unit 144 outputs, synchronizing signal selected cell 145 provides the synchronizing signal (DE, Hsync, Vsync, DCLK) of 141 outputs from the Data Receiving unit or the internal clock signal of exporting from OSC 147 (ICLK).Select in the disable period of signal (CS2) second, synchronizing signal selected cell 145 will 141 synchronizing signals of exporting (DE, IIsync, Vsync, DCLK) provide to control signal generating unit 146 from the Data Receiving unit.At this moment, second select the disable period of signal (CS2) to mean the cycle of not changing frame frequency in the graphics system 150, the cycle that perhaps after finishing frame-rate conversion, provides with stable synchronizing signal (DE, Hsync, Vsync, DCLK).Select under the situation in the cycle that enables of signal (CS2) second, when synchronizing signal was in unstable cycle of inversion frequency process, synchronizing signal selected cell 145 will provide to control signal generating unit 146 from the internal clock signal (ICLK) of OSC 147 outputs.Provide to frame memory 142, video data processing unit 143 and synchronous signal detection unit 144 by synchronizing signal selected cell 145 selected Dot Clock signals (DCLK) or internal clock signal (ICLK).
Control signal generating unit 146 produces data controlling signal (DCS) and grid-control system signal (GCS) by using from the synchronizing signal (DE, Hsync, Vsync, DCLK) or the internal clocking (ICLK) of 145 outputs of synchronizing signal selected cell, and data and the grid-control system signal (DCS, GCS) that is produced provided respectively to data and gate driver 120,130.In detail, in the stable period of synchronizing signal, control signal generating unit 146 is used from the synchronizing signal (DE, Hsync, Vsync, DCLK) of synchronizing signal selected cell 145 outputs and is produced data and grid-control system signal (DCS, GCS).In the unstable cycle of synchronizing signal, produce data and grid-control system signal (DCS, GCS) by using from the internal clock signal (ICLK) of synchronizing signal selected cell 145 outputs.At this moment, if input internal clock signal (ICLK), then control signal generating unit 146 produces data enable signal (DE) by using institute's canned data and internal clock signal (ICLK), and by using data enable signal (DE) and internal clock signal (ICLK) generation level and vertical synchronizing signal (Hsync, Vsync).Then, use the synchronizing signal (DE, Hsync, Vsync) and the internal clock signal (ICLK) that are produced to produce data controlling signal (DCS) and grid-control system signal (GCS).At this moment, control signal generating unit 146 produces data controlling signal (DCS) and grid-control system signal (GCS) by using data enable signal (DE) and internal clock signal (ICLK).
If input is selected signal (CS1) from first of graphics system 150 outputs, then frame memory 142 storages are from the video data of the last frame of Data Receiving unit 141.Then, will be at the video data of selecting the last frame that enables to store the cycle of signal (CS2) from second of synchronous signal detection unit 144 outputs, promptly the video data of former frame provides to video data processing unit 143.
Simultaneously, frame memory 142 makes from the video data of video reception unit 141 output and cushions several frames, and the video data that will cushion several frames provides to video data processing unit 143.In this case, select signal (CS1) if import first, then frame memory 142 keeps the video data of last frame not upgrade.And the video data that will be stored in the last frame (former frame) in the frame memory 142 in the stable period of the second selection signal (CS2) provides to video data processing unit 143.Subsequently, if forbid that according to finishing of frequency inverted second selects signal (CS2), then frame memory 142 cushions the video datas of 141 outputs from the Data Receiving unit, and the video data of buffering is provided to data processing unit 143.Frame memory 142 uses from the Dot Clock signal (DCLK) of synchronizing signal selected cell 145 or internal clock signal (ICLK) input or output video data.
Video data processing unit 143 arrange from Data Receiving unit 141 or the video data of frame memory 142 outputs being suitable for data driver 120, and the video data after will arranging provides to data driver 120.Selecting enabling in the cycle of signal (CS2) from second of synchronous signal detection unit 144, the last frame of storage (promptly in 143 arrangements of video data processing unit and the frame memory 142, former frame) video data that video data is identical, and the data after will arranging provide to data driver 120.Video data processing unit 143 uses from the Dot Clock signal (DCLK) of synchronizing signal selected cell 145 or internal clock signal (ICLK) with inputting video data.
Fig. 4 illustrates the I/O waveform of the time schedule controller shown in Fig. 3.In detail, Fig. 4 illustrates second the selecting signal (CS2), indicate the data enable signal (DE) of the effective period of video data in each horizontal cycle and from the video data of time schedule controller 150 outputs of cycle that first of prediction frame-rate conversion is selected signal (CS1), indication frame-rate conversion.
In the n-1 frame (Fn-1) that first frame frequency (f1) from graphics system 150 drives, produce first and select signal (CS1).Signal (CS1) is selected in response first, and with n frame (Fn), promptly the video data of the last frame that is driven by first frame frequency (f1) is stored in the frame memory 142 by time schedule controller 140.Video data to the n+1 frame (Fn+1) that keeps the n frame (Fn) of storage in the frame memory 142.
If first frame frequency (f1) converts in the process of second frame frequency (f2) in graphics system 150, in synchronizing signal, detect the unstable cycle of data enable signal (DE), then time schedule controller 140 produces the second selection signal (CS2) that enables.Select enabling the cycle of signal (CS2) second, promptly in the n+1 frame (Fn+1), time schedule controller 140 provides the video data of the former frame (Fn) of storage in the frame memory 142 to data driver 120.At this moment, time schedule controller 140 produces the control signal (DCS, GCS) that is suitable for standard frame frequency (f0), control data driver 120 and gate driver 130 thus by using internal clock signal (ICLK).
In this case, compare first of predict frequency conversion and select signal (CS1), it is longer that second of conversion frame frequency selects the enabling the cycle of signal (CS2) (Fn+1) to be delayed, thereby obtain in the process of inversion frequency to prepare to provide to the required time of the video data of liquid crystal display component 110 in time schedule controller 140.That is, can control above-mentioned time delay based on presetting design.And second selects the cycle of enabling of signal (CS2) can comprise that at least one is to several frames.
When the conversion of finishing second frame frequency (f2) in according to graphics system 150 provided stable synchronizing signal, time schedule controller 140 forbade that once more second selects signal (CS2).At the disable period of the second selection signal (CS2), promptly in n+2 the frame (Fn+2), time schedule controller 140 will provide to data driver 120 from the video data of graphics system 150 outputs.And time schedule controller 140 converts the synchronizing signal that is suitable for second frame frequency (f2) to by using in graphics system 150, produce the control signal (DCS, GCS) that is used for control data and gate driver 120,130.
As a result, convert second frame frequency (f2) frame (Fn) before at first frame frequency (f1), liquid crystal display component 110 is driven by first frame frequency (f1), thus display image.At the frame (Fn+1) that is used for first frame frequency (f1) is converted to the process of second frame frequency (f2), liquid crystal display component 110 is driven by the standard frame frequency (f0) of time schedule controller 140, and show former frame (Fn), the i.e. image of the last frame of first frame frequency (f1).From finishing the frame (Fn+2) of first frame frequency (f1) to second frame frequency (f2) conversion, liquid crystal display component 110 is driven by second frame frequency (f2), thus display image.
At the said apparatus that is used for the LCD device according to the present invention, signal (CS1) is selected by first of response pattern system 150, in the process of inversion frequency, use the video data of internal clock signal and former frame to drive liquid crystal display component 110, prevent time schedule controller 140 maloperations and defective imaged image thus.
Fig. 5 illustrates graphics system and time schedule controller second embodiment of the invention.In Fig. 5, the part identical with Fig. 3 is with simple declaration.
As shown in Figure 5, graphics system 250 comprises that video data provides unit 251, synchronizing signal generation unit 252 and data transmission unit 254.
Video data provides unit 251 to arrange from the video data of outside input being suitable for driving the LCD unit according to EDID, and the data after will arranging provide to data transmission unit 254.And, if from outside incoming frequency switching signal (fs), then option data that video data provides unit 251 to produce and output can the predict frequency conversion and the mark whether the indication option data exists.Mark and option data insertion were not provided in the null cycle of video data, and it is provided to data transmission unit 254.
Synchronizing signal generation unit 252 produces a plurality of synchronizing signals (DCLK, Hsync, Vsync, DE) according to EDID, and the synchronizing signal that is produced is provided to data transmission unit 254.And, if from outside incoming frequency switching signal (fs), then the frequency of synchronizing signal generation unit 252 conversion synchronization signals (DCLK, Hsync, Vsync, DE) to be being suitable for selected frame frequency among the EDID, and the synchronizing signal that will have a frequency after the conversion exports data transmission unit 254 to.
Data transmission unit 254 provides in the unit 251 synchronizing signal (Hsync, Vsync, DE) that produces in the video data, mark and the option data that produce and the synchronizing signal generation unit 252 to be compressed into serial data (DE) video data.Then, data transmission unit 254 provides serial data (SD) to time schedule controller 240, and not compressed Dot Clock signal (DCLK) is provided to time schedule controller 240.
As shown in Figure 5, time schedule controller 240 comprises Data Receiving unit 241, frame memory 242, video data processing unit 243, synchronous signal detection unit 244, synchronizing signal selected cell 245, control signal generating unit 246, oscillator (OSC) 247 and option determining unit 248.
Data Receiving unit 241 will be reduced into synchronizing signal (DE, Hsync, Vsync) from the serial data (SD) of graphics system 250 outputs, and the video data and the synchronizing signal of line output reduction, and export the Dot Clock signal (DCLK) that is not reduced.
If 241 option data by the 243 input predict frequency conversions of video data processing unit from the Data Receiving unit, then option determining unit 248 produces the first selection signal (CS1) as shown in Figure 4.
If select signal (CS1) to synchronous signal detection unit 244 inputs first from option determining unit 248, then synchronous signal detection unit 244 one of is checked from the synchronizing signal (DE, Hsync, Vsync, DCLK) of Data Receiving unit 241 outputs at least, detects its unstable cycle thus.Then, synchronous signal detection unit 244 produces the second selection signal (CS2) in indication frequency inverted cycle.At this moment, synchronous signal detection unit 244 is counted the quantity of data enable signal (DE) by using Dot Clock signal (DCLK) or internal clock signal (ICLK).If the quantity behind the counting exceeds term of reference, then preferably be considered as the unstable cycle, produce second thus and select signal (CS2).
The disable period of second detection signal of exporting from synchronous signal detection unit 244 (CS2), synchronizing signal selected cell 245 will 241 synchronizing signals of exporting (DE, Hsync, Vsync, DCLK) provide to control signal generating unit 246 from the Data Receiving unit.Select the enabling in the cycle of signal (CS2) second, when synchronizing signal was in unstable cycle of inversion frequency process, synchronizing signal selected cell 245 will provide to control signal generating unit 246 from the internal clock signal (ICLK) of OSC 247 outputs.Provide to frame memory, video data processing unit 243 and synchronous signal detection unit 244 by synchronizing signal selected cell 245 selected Dot Clock signals (DCLK) or internal clock signal (ICLK).
In the stable period of synchronizing signal, control signal generating unit 246 produces data controlling signal (DCS) and grid-control system signal (GCS) by using from the synchronizing signal (DE, Hsync, Vsync, DCLK) of synchronizing signal selected cell 245 outputs.In the unstable cycle of synchronizing signal, control signal generating unit 246 produces data controlling signal (DCS) and grid-control system signal (GCS) by using the internal clock signal (ICLK) from synchronizing signal selected cell 245.
If frame memory 242 inputs are selected signal (CS1) from first of option determining unit 248 outputs, then frame memory 242 storages are from the video data of the last frame of Data Receiving unit 241, and with former frame, that is, select the video data of the last frame that enables to store in the cycle of signal (CS2) to provide to video data processing unit 243 from second of synchronous signal detection unit 244.Frame memory 242 uses from the Dot Clock signal (DCLK) of synchronizing signal selected cell 245 or internal clock signal (ICLK) with input or output video data.
Simultaneously, frame memory 242 makes from the video data of video reception unit 241 outputs and cushions several frames, and the video data of buffering is provided to video data processing unit 243.In this case, select signal (CS1) if import first, then the video data of last frame inputs to frame memory 242, keeps these data not upgrade then.Enabling in the cycle of the second selection signal (CS2), the video data that is stored in the last frame (former frame) of storage in the frame memory 242 is provided to video data processing unit 243.Subsequently, if forbid that according to finishing of frequency inverted second selects signal (CS2), then frame memory 242 bufferings are from the video data of Data Receiving unit 241, and the video data of buffering is provided to data processing unit 243.
Video data processing unit 243 arrange from Data Receiving unit 241 or the video data of frame memory 242 outputs being suitable for data driver 120, and the data after will arranging provide to data driver 120.And, if the mark of input indication option data is inserted in from the video data of Data Receiving unit 241 outputs, then video data processing unit 243 is isolated option data from video data, and isolated option data is provided to option determining unit 248.At this moment, as shown in Figure 6, mark and option data were inserted in the null cycle of the overlapping data enable signal (DE) of forward and backward part with horizontal-drive signal (Hsync).Selecting enabling the cycle of signal (CS2) from second of synchronous signal detection unit 244 outputs, video data processing unit 243 is arranged and former frame, be the identical video data of video data of the last frame of storage in the frame memory 242, and the data after will arranging provide to data driver 120.Dot Clock signal (DCLK) or internal clock signal (ICLK) inputting video data that video data processing unit 243 uses from synchronizing signal selected cell 245.
At the said apparatus that is used for driving the LCD device according to the present invention, response is from the option data of graphics system 250 outputs, in the process of inversion frequency, use the video data of internal clock signal and former frame to drive liquid crystal display component 110, prevent the maloperation and the defective imaged image of time schedule controller 240 thus.
Fig. 7 illustrates according to the graphics system of the 3rd embodiment of the present invention and time schedule controller, and wherein the structure of the graphics system among graphics system 150 and Fig. 3 is identical, therefore omits the detailed description to graphics system 150.
The graphics system 150 of Fig. 7 comprises: provide the video data of video data that unit 151 is provided; Synchronizing signal generation unit 152 is used to provide synchronizing signal (DCLK, Hsync, Vsync, DE), and the frequency of response frequency switching signal (fs) conversion synchronization signal; Frequency inverted determining unit 153, being used for response frequency switching signal (fs) provides first to select signal (CS1); And data transmission unit 154, be used for video data and synchronizing signal (Hsync, Vsync, DE) are compressed into serial data (SD) and export serial data (SD).
The time schedule controller 340 of Fig. 7 comprises Data Receiving unit 341, video data processing unit 343, synchronous signal detection unit 344, synchronizing signal selected cell 345 and control signal generating unit 346.
Data Receiving unit 341 will be reduced into video data and synchronizing signal (DE, Hsync, Vsync) from the serial data (SD) of graphics system 150 output, and with itself and line output, then the Dot Clock signal (DCLK) that is not reduced of output.
The video datas that video data processing unit 343 is arranged 341 outputs from the Data Receiving unit are being suitable for data driver 120, and the video data after will arranging provides to data driver 120.
If synchronous signal detection unit 344 inputs are selected signal (CS1) from first of graphics system 150 outputs, then synchronous signal detection unit 344 one of is checked in the synchronizing signals (DE, Hsync, Vsync, DLCK) at least, to detect its unstable cycle, produce second thus and select signal (CS2).According to selecting signal (CS2) from second of synchronous signal detection unit 344 output, synchronizing signal selected cell 345 can provide synchronizing signal (DE, Hsync, Vsync, DLCK), one of perhaps cuts off in the synchronizing signal at least.Select in the disable period of signal (CS2) second, synchronizing signal selected cell 345 will 341 synchronizing signals of exporting (DE, Hsync, Vsync, DLCK) provide to control signal generating unit 346 from the Data Receiving unit.In this case, second select the disable period of signal (CS2) to represent according in graphics system 150, not producing the cycle that finishing of frame-rate conversion or frame-rate conversion stablized provides synchronizing signal (DE, Hsync, Vsync, DLCK).Select enabling the cycle of signal (CS2) second, promptly have in the process of frequency inverted in the cycle of unstable synchronizing signal, synchronizing signal selected cell 345 one of cuts off in the synchronizing signals at least, for example input of Dot Clock signal (DCLK).
In the stable period of synchronizing signal, control signal generating unit 346 produces data controlling signal (DCS) and grid-control system signal (GCS) by using from the synchronizing signal (DE, Hsync, Vsync, DLCK) of synchronizing signal selected cell 345 outputs, and described data and grid-control system signal (DCS, GCS) are provided respectively to data driver 120 and gate driver 130.In the unstable cycle of synchronizing signal, because by synchronizing signal selected cell 345 input sync signal not, i.e. Dot Clock signal (DCLK) is not so produce data and grid-control system signal (DCS, GCS) in control signal generating unit 346.Deposit in the unstable cycle of synchronizing signal, promptly in graphics system 150 in the cycle of inversion frequency, control signal generating unit 346 is controlled not driving data and gate driver 120,130.Therefore, in the unstable cycle of synchronizing signal, the image of the former frame that liquid crystal display component 110 charges when remaining on driving data driver 120 and gate driver.
The device response that is used to drive the LCD device according to the present invention is selected signal (CS1) from first of graphics system 150 outputs, thereby not driving data and gate driver 120,130 when frame-rate conversion, but in liquid crystal display component, keep the image of former frame, prevent defective imaged image thus.
Fig. 8 illustrates according to the graphics system of the 4th embodiment of the present invention and time schedule controller, and wherein graphics system 250 is identical with the structure of the graphics system of Fig. 5, therefore omits the detailed description to graphics system 250.
The graphics system of Fig. 8 comprises: video data provides unit 251, is used to provide video data, and response frequency switching signal (fs) and produce and provide mark and option data; Synchronizing signal generation unit 252 is used to provide synchronizing signal (DCLK, Hsync, Vsync, DE), and the frequency of response frequency switching signal (fs) conversion synchronization signal (DCLK, Hsync, Vsync, DE); And data transmission unit 254, be used for video data, mark, option data and synchronizing signal are compressed into serial data (SD).
As shown in Figure 8, time schedule controller 440 comprises Data Receiving unit 441, video data processing unit 443, synchronous signal detection unit 444, synchronizing signal selected cell 445, control signal generating unit 446 and option determining unit 448.
Data Receiving unit 441 will be reduced into video data and synchronizing signal (DE, Hsync, Vsync) from the serial data (SD) of graphics system 250 outputs, and the data of line output reduction, and export the Dot Clock signal (DCLK) that is not reduced.
The video datas that video data processing unit 443 is arranged 441 outputs from the Data Receiving unit are being suitable for data driver 120, and the data after will arranging provide to data driver 120.And, if the mark of being imported indication option data is inserted in from the video data of Data Receiving unit 441 outputs, then video data processing unit 443 is isolated option data from video data, and isolated option data is provided to option determining unit 448.
If from the option data of video data processing unit 443 input predict frequency conversions, then option determining unit 448 produces first and selects signal (CS1).
If select signal (CS1) from option determining unit 448 input first, then synchronous signal detection unit 444 one of is checked from the synchronizing signal (DE, Hsync, Vsync, DLCK) of Data Receiving unit 441 outputs at least, detects its unstable cycle thus.Then, synchronous signal detection unit 444 produces the second selection signal (CS2) in indication frequency inverted cycle.
According to selecting signal (CS2) from second of synchronous signal detection unit 444 outputs, synchronizing signal selected cell 445 can provide from the synchronizing signal of Data Receiving unit 441 (DE, Hsync, Vsync, DLCK), one of perhaps cuts off in the synchronizing signal at least.Select in the disable period of signal (CS2) second, synchronizing signal selected cell 445 will 441 synchronizing signals of exporting (DE, Hsync, Vsync, DLCK) provide to control signal generating unit 446 from the Data Receiving unit.Select enabling the cycle of signal (CS2) second, promptly have in the process of frequency inverted in the cycle of unstable synchronizing signal, synchronizing signal selected cell 445 one of cuts off in the synchronizing signals at least, for example input of Dot Clock signal (DCLK).
In the stable period of synchronizing signal, control signal generating unit 446 produces data controlling signal (DCS) and grid-control system signal (GCS) by using from the synchronizing signal (DE, Hsync, Vsync, DLCK) of synchronizing signal selected cell 445 outputs, and data and the grid-control system signal (DCS, GCS) that is produced provided respectively to data driver 120 and gate driver 130.In the unstable cycle of synchronizing signal, because by synchronizing signal selected cell 445 input sync signal not, i.e. Dot Clock signal (DCLK) is not so produce data and grid-control system signal (DCS, GCS) in control signal generating unit 446.Therefore, in the unstable cycle of synchronizing signal, promptly in graphics system 250 in the cycle of inversion frequency, control signal generating unit 446 helps not driving data and gate driver 120,130.
According to the option data that is used to drive the device response of LCD device from graphics system 250 outputs of the present invention, thereby not driving data and gate driver 120,130 when frame-rate conversion, but in liquid crystal display component, keep the image of former frame, prevent defective imaged image thus.
As mentioned above, the apparatus and method that are used to drive the LCD device according to the present invention have following advantage.
In the apparatus and method that are used for driving the LCD device according to the present invention, the frequency inverted information of forecasting that response provided from graphics system before frequency inverted, in the process of conversion frame frequency, use the video data of internal clocking and former frame to drive liquid crystal display component, prevent the maloperation and the defective imaged image of time schedule controller thus.
The frequency inverted information of forecasting that the device response that is used to drive the LCD device according to the present invention provided from graphics system before frequency inverted, thereby do not drive gate driver and data driver, and liquid crystal display component keeps the image of former frame, prevents defective image thus.
Therefore, the apparatus and method that are used to drive the LCD device according to the present invention can be changed frame frequency under the situation that does not produce defective image, reduce energy consumption thus.
Obviously, do not breaking away from the spirit or scope of the present invention, those skilled in the art can make various modifications and variations in the present invention.Thereby the present invention is intended to cover modification of the present invention and the modification that falls within appended claims and the equivalent scope thereof.

Claims (27)

1. device that is used to drive liquid crystal display device comprises:
Liquid crystal display component is used for display image;
Driver is used to drive this liquid crystal display component;
Graphics system, be used to provide video data and a plurality of synchronizing signal, produce the first selection signal relevant according to frequency conversion signal, after producing this first selection signal, respond the frequency of this frequency conversion signal conversion synchronization signal then with the frequency inverted information of forecasting from the outside input; And
Time schedule controller is used for responding this and first selects signal and one of at least detect the unstable cycle from described synchronizing signal, if do not detect the unstable cycle, then controls this driver and show normal video data on this liquid crystal display component; If detect the unstable cycle, then produce the second selection signal that is used to indicate this instability cycle, respond this second selection signal, when inversion frequency, control this driver shows former frame on this liquid crystal display component video data,
Wherein this time schedule controller comprises:
Synchronous signal detection unit is used for responding this and first selects signal and one of at least detect this instability cycle from described synchronizing signal, and produces this and second select signal;
Oscillator is used to produce internal clocking;
The synchronizing signal selected cell is used to respond this and second selects signal and optionally export described synchronizing signal or this internal clocking;
Control signal generating unit is used for producing a plurality of control signals that are used to control this driver by using described synchronizing signal or this internal clocking from this synchronizing signal selected cell;
Frame memory is used to respond this and first selects signal and store video data from the former frame of this graphics system, and responds this and second select signal and export institute's video data stored; And
The video data processing unit, be used to arrange video data from this graphics system, export the video data after arranging to this driver, respond this and second select signal and arrange video data, and the video data after will arranging exports this driver to from the former frame of this frame memory.
2. device according to claim 1 is characterized in that, this graphics system comprises:
Video data provides the unit, is used to provide described video data;
The synchronizing signal generation unit is used to export described a plurality of synchronizing signal, responds the frequency that this frequency conversion signal is changed described synchronizing signal; And
The frequency inverted determining unit is used to respond this frequency conversion signal and produces and export this first selection signal.
3. device according to claim 1, it is characterized in that, if import this internal clocking, then this control signal generating unit produces at least one synchronizing signal by using this internal clocking and the information of depositing, and by using this internal clocking and at least one synchronizing signal to produce described control signal.
4. device that is used to drive liquid crystal display device comprises:
Liquid crystal display component is used for display image;
Driver is used to drive this liquid crystal display component;
Graphics system, be used to provide video data and a plurality of synchronizing signal, produce the option data relevant according to frequency conversion signal, after producing described option data, respond the frequency of this frequency conversion signal conversion synchronization signal then with the frequency inverted information of forecasting from the outside input; And
Time schedule controller, be used to respond this option data and produce the first selection signal, responding this first selects signal and detect one of at least the unstable cycle from described synchronizing signal, if do not detect the unstable cycle, then control this driver and on this liquid crystal display component, show normal video data; If detect the unstable cycle, then produce the second selection signal that is used to indicate this instability cycle, respond this second selection signal, when inversion frequency, control this driver shows former frame on this liquid crystal display component video data,
Wherein this time schedule controller comprises:
The option determining unit is used to respond described option data and produces this first selection signal;
Synchronous signal detection unit is used for responding this and first selects signal one of at least to detect this instability cycle from described synchronizing signal, and produces this and second select signal;
Oscillator is used to produce internal clocking;
The synchronizing signal selected cell is used to respond this and second selects signal and optionally export described synchronizing signal or this internal clocking;
Control signal generating unit is used for producing a plurality of control signals that are used to control this driver by using described synchronizing signal or this internal clocking from this synchronizing signal selected cell;
Frame memory is used to respond this and first selects signal and store video data from the former frame of this graphics system, and responds this and second select signal and export institute's video data stored; And
The video data processing unit, be used to arrange video data from this graphics system, export the video data after arranging to this driver, to export this option determining unit to according to the isolated option data of this mark, respond this and second select signal and arrange video data, and the video data after will arranging exports this driver to from the former frame of this frame memory.
5. device according to claim 4 is characterized in that, this graphics system comprises:
Video data provides the unit, is used to provide described video data, and responds the mark that this frequency conversion signal produces described option data and is used to indicate whether to exist described option data; And
The synchronizing signal generation unit is used to export described a plurality of synchronizing signal, and responds the frequency that this frequency conversion signal is changed described synchronizing signal.
6. device according to claim 4 is characterized in that this synchronous signal detection unit is counted the data enable signal from described synchronizing signal according to Dot Clock, detects the unstable cycle of described data enable signal thus.
7. device according to claim 4, it is characterized in that, if import this internal clocking, then this control signal generating unit produces at least one synchronizing signal by using this internal clocking and the information of depositing, and by using this internal clocking and at least one synchronizing signal to produce described control signal.
8. device according to claim 7 is characterized in that, the video data of described former frame is the video data before enabling this second selection signal.
9. device according to claim 8, it is characterized in that, under the state of buffering from the video data of this graphics system, this frame memory exports described video data to this video data processing unit, and under the state of the video data of the former frame of storing keeping this first selection signal of response, this frame memory provides enabling the cycle to this second selection signal with the video data of this former frame.
10. device that is used to drive liquid crystal display device comprises:
Liquid crystal display component is used for display image;
Driver is used to drive this liquid crystal display component;
Graphics system, be used to provide video data and a plurality of synchronizing signal, produce the first selection signal relevant according to frequency conversion signal, after producing this first selection signal, respond the frequency of this frequency conversion signal conversion synchronization signal then with the frequency inverted information of forecasting from the outside input; And
Time schedule controller is used for responding this and first selects signal and one of at least detect the unstable cycle from described synchronizing signal, if do not detect the unstable cycle, then controls this driver and show normal video data on this liquid crystal display component; If detect the unstable cycle, then produce the second selection signal that is used to indicate this instability cycle, prevent to drive this driver, thereby respond this second selection signal, when inversion frequency, control this driver shows former frame on this liquid crystal display component video data
Wherein this time schedule controller comprises:
Synchronous signal detection unit is used for responding this and first selects signal and one of at least detect this instability cycle from described synchronizing signal, and produces this and second select signal;
Control signal generating unit is used for by using described synchronizing signal to produce a plurality of control signals that are used to control this driver;
The synchronizing signal selected cell is used to respond this and second selects signal and export described synchronizing signal to this control signal generating unit, perhaps cuts off described synchronizing signal; And
The video data processing unit be used to arrange the video data from this graphics system, and the video data after will arranging exports this driver to.
11. device according to claim 10 is characterized in that, this graphics system comprises:
Video data provides the unit, is used to export described video data;
The synchronizing signal generation unit is used to export described a plurality of synchronizing signal, and responds the frequency that this frequency conversion signal is changed described synchronizing signal; And
The frequency inverted determining unit is used to respond this frequency conversion signal and produces and provide this first selection signal.
12. a device that is used to drive liquid crystal display device comprises:
Liquid crystal display component is used for display image;
Driver is used to drive this liquid crystal display component;
Graphics system, be used to provide video data and a plurality of synchronizing signal, produce the option data relevant according to frequency conversion signal, after producing described option data, respond the frequency of this frequency conversion signal conversion synchronization signal then with the frequency inverted information of forecasting from the outside input; And
Time schedule controller, be used to respond described option data and produce the first selection signal, responding this first selects signal and detect one of at least the unstable cycle from described synchronizing signal, if do not detect the unstable cycle, then control this driver and on this liquid crystal display component, show normal video data; If detect the unstable cycle, then produce the second selection signal that is used to indicate this instability cycle, prevent to drive this driver, thereby respond this second selection signal, when inversion frequency, control this driver shows former frame on this liquid crystal display component video data
Wherein this time schedule controller comprises:
The option determining unit is used to respond described option data and produces this first selection signal;
Synchronous signal detection unit is used for responding this and first selects signal one of at least to detect this instability cycle from described synchronizing signal, and produces this and second select signal;
Control signal generating unit is used for by using described synchronizing signal to produce a plurality of control signals that are used to control this driver;
The synchronizing signal selected cell is used to respond this and second selects signal and described synchronizing signal is provided to this control signal generating unit, perhaps cuts off the input of described synchronizing signal; And
The video data processing unit be used to arrange the video data from this graphics system, and the video data after will arranging exports this driver to.
13. device according to claim 12 is characterized in that, this graphics system comprises:
Video data provides the unit, is used to export described video data, and responds the mark that this frequency conversion signal produces described option data and is used to indicate whether to exist described option data; And
The synchronizing signal generation unit is used to export described a plurality of synchronizing signal, responds the frequency that this frequency conversion signal is changed described synchronizing signal, and the synchronizing signal after the frequency inverted is provided.
14. device according to claim 12 is characterized in that, this synchronous signal detection unit is counted the data enable signal from described synchronizing signal according to Dot Clock, detects the unstable cycle of described data enable signal thus.
15. a method that is used to drive liquid crystal display device comprises:
Produce frequency conversion signal;
Respond this frequency conversion signal, produce the first selection signal relevant with the frequency inverted information of forecasting;
After producing this first selection signal, respond this frequency conversion signal, the frequency of conversion synchronization signal;
Responding this first selects signal and detect one of at least the unstable cycle from described synchronizing signal;
Generation is used to indicate second of this instability cycle to select signal;
Respond this second selection signal and optionally export described synchronizing signal or internal clocking;
By using described synchronizing signal or this internal clocking, produce a plurality of control signals;
Respond this and first select signal and store video data, and respond this and second select signal and export institute's video data stored from the former frame of this graphics system;
If do not detect the unstable cycle, then on this liquid crystal display component, show normal video data; And
If detect the unstable cycle, then respond this second selection signal, when inversion frequency, on this liquid crystal display component, show the video data of former frame.
16. method according to claim 15 is characterized in that, this instability cycle is corresponding to the cycle that detects the unstable cycle of data enable signal in described synchronizing signal.
17. a method that is used to drive liquid crystal display device comprises:
Produce frequency conversion signal;
Respond this frequency conversion signal, produce and the corresponding option data of frequency inverted information of forecasting;
After producing described option data, respond this frequency conversion signal, the frequency of conversion synchronization signal;
Respond described option data, produce first and select signal;
Responding this first selects signal and detect one of at least the unstable cycle from described synchronizing signal;
Generation is used to indicate second of this instability cycle to select signal;
Respond this second selection signal and optionally export described synchronizing signal or internal clocking;
By using described synchronizing signal or this internal clocking, produce a plurality of control signals;
Respond this and first select signal and store video data, and respond this and second select signal and export institute's video data stored from the former frame of this graphics system;
If do not detect the unstable cycle, then on this liquid crystal display component, show normal video data; And
If detect the unstable cycle, then respond this second selection signal, when inversion frequency, on this liquid crystal display component, show the video data of former frame.
18. method according to claim 17 is characterized in that, this instability cycle is corresponding to the cycle that detects the unstable cycle of data enable signal in described synchronizing signal.
19. method according to claim 17 is characterized in that, also comprises:
After producing option data, produce the mark that is used to indicate whether to exist described option data; And
Export this mark and option data null cycle to the effective period of described video data.
20. a method that is used to drive liquid crystal display device comprises:
Produce frequency conversion signal;
Respond this frequency conversion signal, produce the first selection signal relevant with the frequency inverted information of forecasting;
After producing this first selection signal, respond this frequency conversion signal, the frequency of conversion synchronization signal;
Responding this first selects signal and detect one of at least the unstable cycle from described synchronizing signal;
Generation is used to indicate second of this instability cycle to select signal;
By using described synchronizing signal, produce a plurality of control signals;
Respond this second selection signal and export described synchronizing signal, perhaps cut off described synchronizing signal;
If do not detect the unstable cycle, then on this liquid crystal display component, show normal video data; And
If detect the unstable cycle, then respond this and second select signal, cut off the input of at least one synchronizing signal that is used to produce a plurality of control signals, and when inversion frequency, on this liquid crystal display component, keep and show the video data of former frame.
21. method according to claim 20 is characterized in that, this instability cycle is corresponding to the cycle that detects the unstable cycle of data enable signal in described synchronizing signal.
22. method according to claim 20 is characterized in that, also comprises:
After producing option data, produce the mark that is used to indicate whether to exist described option data; And
Export this mark and option data null cycle to the effective period of described video data.
23. method according to claim 20 is characterized in that, is breaking at the input of described synchronizing signal mid point clock signal in the cycle in this frequency inverted.
24. a method that is used to drive liquid crystal display device comprises:
Produce frequency conversion signal;
Respond this frequency conversion signal, produce the option data relevant with the frequency inverted information of forecasting;
After producing described option data, respond this frequency conversion signal, the frequency of conversion synchronization signal;
Respond described option data and produce the first selection signal;
Respond this and first select signal, from described synchronizing signal, detect one of at least the unstable cycle;
Generation is used to indicate second of this instability cycle to select signal;
By using described synchronizing signal, produce a plurality of control signals;
Respond this and second select signal and be provided for producing the described synchronizing signal of a plurality of control signals, perhaps cut off the input of described synchronizing signal;
If do not detect the unstable cycle, then on this liquid crystal display component, show normal video data; And
If detect the unstable cycle, then respond this and second select signal, cut off the input of at least one synchronizing signal that is used to produce a plurality of control signals, and when inversion frequency, on this liquid crystal display component, show the video data of former frame.
25. method according to claim 24 is characterized in that, this instability cycle is corresponding to the cycle that detects the unstable cycle of data enable signal in described synchronizing signal.
26. method according to claim 24 is characterized in that, also comprises:
After producing option data, produce the mark that is used to indicate whether to exist described option data; And
Export this mark and option data null cycle to the effective period of described video data.
27. method according to claim 24 is characterized in that, is breaking at the input of described synchronizing signal mid point clock signal in the cycle in this frequency inverted.
CN200610152489XA 2006-03-30 2006-10-09 Apparatus and method for driving liquid crystal display device Expired - Fee Related CN101046941B (en)

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