TWI416489B - Liquid crystal display and driving method thereof - Google Patents

Abstract

A liquid crystal display (LCD) and a driving method thereof is provided. The LCD includes an LCD panel, a timing controller and a source driver. The timing controller is used for providing a periodic load signal when the LCD is in the initial power-on. The source driver is coupled to the LCD panel and the timing controller and used for receiving the load signal starting from the LCD is in the initial power-on and counting the number of times of the load signal with enabled level, or detecting the time of the load signal. When the number of times of the load signal with enabled level counted by source driver reaches a predetermined number of times, or when the time of the load signal has got past a predetermined time detected by the source driver, the source driver outputs the image frame data to drive and make that the LCD panel displays the image frame.

Description

Liquid crystal display and driving method thereof

The present invention relates to a flat panel display, and more particularly to a liquid crystal display and a method of driving the same.

In recent years, with the rapid development of semiconductor technology, portable electronic products and flat panel display products have also emerged. Among the many types of flat panel displays, liquid crystal displays (LCDs) have become the mainstream of display products based on their low voltage operation, no radiation scattering, light weight and small size.

Generally, when the liquid crystal display is initially power on, the timing controller controls the source driver to output the load signal TP and the source of the image data Dout. The image picture data Dout output by the polar driver is output synchronously (as shown in Figure 1). Therefore, under this condition, if the source driver does not complete the reset operation when the liquid crystal display is initially turned on (that is, the internal memory of the source driver may still have some image data of the liquid crystal display before the shutdown). Or some residual noise signal), although the gate driver may not start to sequentially turn on the column pixels of the liquid crystal display panel by scanning signals, but the active components of each pixel in the liquid crystal display panel (such as thin film electricity) When the crystal, TFT) is in the off state, the active component may not be completely turned off due to the internal leakage current, so it is likely to cause the liquid crystal display to be turned on immediately. Now the phenomenon of starting straight stripes.

In view of the above, the present invention provides a liquid crystal display which does not have a phenomenon of starting straight stripes at the initial startup.

The present invention provides a liquid crystal display including a liquid crystal display panel, a timing controller, and a source driver. The timing controller is configured to provide a periodic load signal when the liquid crystal display is initially turned on. The source driver is coupled to the liquid crystal display panel and the timing controller, and is configured to start receiving the loading signal when the liquid crystal display is initially turned on, and start counting the number of times the loading signal is enabled to reach a preset. After setting the number of times or detecting the loading signal for a predetermined time, the image frame data is output to drive and cause the liquid crystal display panel to display the image frame.

In an exemplary embodiment of the present invention, when the source driver counts the number of occurrences of the load signal enable level, the preset number of times is not reached or the load signal is detected to be unexperienced. When the preset time is described, the source driver outputs a black screen material to drive and cause the liquid crystal display panel to display a black screen.

The present invention further provides a driving method of a liquid crystal display, comprising: providing a periodic loading signal when the liquid crystal display is initially turned on; and starting to activate the loading signal when the liquid crystal display is initially turned on. After the number of times is counted to reach a preset number of times or after detecting that the loading signal has passed a predetermined time, an image frame data is output to drive and cause a liquid crystal display panel to display an image frame.

In an exemplary embodiment of the present invention, the driving method of the liquid crystal display further includes: counting the number of occurrences of the load signal enable level without reaching the preset number of times or detecting the load When the input signal does not undergo the preset time, the black screen data is output to drive and cause the liquid crystal display panel to display a black screen.

The present invention further provides a liquid crystal display comprising a liquid crystal display panel, a timing controller, and a source driver. The timing controller is used to provide a periodic load signal when the liquid crystal display is initially turned on. The source driver includes an image picture data generating unit. The source driver is coupled to the liquid crystal display panel and the timing controller. When the source driver initially receives the loading signal, the image frame data generating unit correspondingly generates an image frame data, and the source driver starts counting the number of occurrences of the loading signal enable level. After the counting reaches a preset number of times or after detecting that the loading signal has passed a predetermined time, the image frame data is output to drive and cause the liquid crystal display panel to display an image frame.

In an exemplary embodiment of the invention, the source driver further includes a black screen data generating unit for generating a black screen material. The source driver outputs the black when the source driver counts the number of occurrences of the load signal enable level and has not reached the preset number of times or detects that the load signal has not experienced the preset time The screen data is driven to cause the liquid crystal display panel to display a black screen.

The invention mainly delays the loading signal used by the timing controller to control the output image data of the source driver when the liquid crystal display is initially turned on, thereby being different from the image data output by the source driver. Step output. In this way, in the process of delaying the loading of the signal output by the timing controller, the source driver outputs black screen data to drive and cause the liquid crystal display panel to display a black screen. Therefore, the liquid crystal display of the present invention does not appear to be turned on at the initial startup.

It is to be understood that the foregoing general description and claims

Reference will now be made in detail to the preferred exemplary embodiments embodiments In addition, wherever possible, the same reference numerals in the drawings

FIG. 2 is a block diagram of a system of a liquid crystal display 200 according to an exemplary embodiment of the invention. Referring to FIG. 2 , the liquid crystal display 200 includes a liquid crystal display panel 201 , a timing controller 203 , a source driver 205 , a gate driver 207 , and a backlight module 209 for providing a backlight required for the liquid crystal display panel 201 . The timing controller 203 is used to control the operation of the source driver 205 and the gate driver 207.

More specifically, the timing controller 203 controls the gate driver 207 to sequentially output a scan signal to turn on each column of pixels in the liquid crystal display panel 201. In addition, the timing controller 203 controls the source driver 205 to output image frame data Dout or black screen material Bout. In the exemplary embodiment, the timing controller 203 provides a periodic load signal TP to the source when the liquid crystal display 200 is initially powered on. Driver 205.

The source driver 205 is coupled to the liquid crystal display panel 201 and the timing controller 203 for receiving and counting the number of occurrences of the loading signal TP enable level. Before the counting result has not reached the preset number of times, the source driver 205 will The black screen data Bout is output to drive and cause the liquid crystal display panel 201 to display a black screen; and when the counting result reaches a preset number of times, the source driver 205 outputs the image frame material Dout to drive and causes the liquid crystal display panel 201 to display the image screen.

According to the disclosure of the prior art, when the liquid crystal display is initially turned on, the timing controller controls the source driver to output the image data (Dout) of the input signal (TP) and the image data output by the source driver. The output is synchronized and output to the pixel data line of the liquid crystal display panel. In this way, together with the various factors of leakage current caused by the active components (such as thin film transistors, TFTs) of the pixels in the liquid crystal display panel, it is likely to cause the liquid crystal display to start up at the initial startup. The phenomenon of straight stripes.

In view of this, in the exemplary embodiment, when the liquid crystal display device 200 is initially powered on, the source driver 205 will not appear at the first enabling level (ie, the high voltage level) of the loading signal TP. Corresponding to the output image screen data Dout to the pixel data line of the liquid crystal display panel to display the image, but output the image screen after the loading signal TP passes through several enabling levels (or the loading signal TP has passed a preset time) The data Dout is given to the data line of the liquid crystal display panel, that is, the image picture data Dout will be delayed output. In other words, the image data Dout output by the source driver 205 The output of the first enable level of the load signal TP is synchronously outputted to the liquid crystal display panel 201. In addition, after the liquid crystal display device 200 is powered on, the source driver 205 provides a black screen material Bout from the start of receiving the loading signal TP to the beginning of outputting the image image data Dout to the liquid crystal display panel 201. The liquid crystal display panel 201 is applied to cause the liquid crystal display panel 201 to display a black screen. Therefore, the liquid crystal display 200 of the exemplary embodiment of the present invention can greatly improve the phenomenon of the starting straight stripes appearing at the instant of turning on the conventional display.

More recently, FIG. 3 illustrates a block diagram of a source driver 205 in accordance with an exemplary embodiment of the present invention. Referring to FIG. 2 and FIG. 3 together, the source driver 205 includes a video picture data generating unit 301, a black picture data generating unit 303, a counting unit 305, and an output multiplex unit 307. The image frame data generating unit 301 is coupled to the timing controller 203 for receiving and processing the video signal VS provided by the timing controller 203 to generate the image frame data Dout. In general, the video picture data generating unit 301 can be roughly composed of a shift register, a latch, and a digital analog converter (D/A converter), but due to the operation of the components. The principles are well known to those of ordinary skill in the art and are therefore not described herein.

The black screen data generating unit 303 is configured to generate the black screen material Bout, for example, the black screen material Bout of the ground level, but is not limited thereto. It is worth mentioning that the black picture data of the exemplary embodiment is generated by an additional black picture data generating unit 303 instead of the traditional black picture. The technique of block frame insertion (BFI) is directly generated by the video picture material generating unit 301 corresponding to the present embodiment. The counting unit 305 is coupled to the timing controller 203 for receiving and counting the number of occurrences of the loading signal TP enable level, and outputting the selection signal SS accordingly. The output multiplex unit 307 is coupled to the image data generating unit 301, the black screen data generating unit 303, and the counting unit 305 for receiving the selection signal SS, the image data Dout and the black image data Bout, and determining the output according to the selection signal SS. Image screen data Dout or black screen data Bout.

In the present exemplary embodiment, when the liquid crystal display 200 is turned on by the user, for example, the user performs a power-on action, the counting unit 305 receives the load signal TP from the timing controller 203. In other words, the counting unit 305 starts to receive the loading signal TP after the liquid crystal display 200 is turned on, so as to start counting the number of times the loading signal TP is enabled or the time elapsed after loading the signal TP, thereby corresponding to the output selection signal SS. .

For example, after the first time the receiving of the loading signal TP is started, the counting unit 305 starts counting the number of times the enabling level of the loading signal TP is counted or the time elapsed after detecting the loading of the signal TP. When the counting unit 305 detects that the number of times the enable level of the loading signal TP has occurred has reached a preset number of times (for example, 7 times as shown in FIG. 4, but is not limited thereto) or detects loading After the signal TP has passed the preset time T, the counting unit 305 outputs a selection signal SS of a first logic state (for example, a high logic level) to the output multiplexing unit 307. In this way, the output multiplex unit 307 starts outputting the image data Dout (as shown in the bottom signal of FIG. 4). To the liquid crystal display panel 201.

On the other hand, when the counting unit 305 counts the number of occurrences of the loading signal TP enable level, the preset number of times (ie, less than 7 times) has not been reached, or the time that the loading signal TP has elapsed is less than the preset time. At time T, the counting unit 305 outputs a selection signal SS of a second logic state (for example, a low logic level) to the output multiplex unit 307. In this way, the output multiplex unit 307 outputs the black screen material Bout. In other exemplary embodiments of the present invention, the logic state of the selection signal SS may be changed according to actual design requirements, that is, the logic high becomes logic low, and the logic low becomes logic high, as long as the exemplary implementation is maintained. The corresponding operation can be done.

Based on the above, FIG. 4 is a schematic diagram of a load signal TP, a video image data Dout, and a black screen data Bout according to an exemplary embodiment of the present invention. Referring to FIG. 2 to FIG. 4, it can be clearly seen from FIG. 4 that the image picture data Dout outputted by the source driver 205 will not be output synchronously when the first enable level 401 of the loading signal TP appears. To the liquid crystal display panel 201.

More specifically, the counting unit 305 starts to receive the loading signal TP after the liquid crystal display 200 is turned on, so as to start counting the number of times the loading signal TP enables the level 401 to appear. Before the occurrence of the seventh enable level 401 of the load signal TP (that is, before the number of occurrences of the enable level 401 is less than a preset number of times) or the time that the signal TP is loaded has not reached a preset time Before T, the source driver 205 outputs a black picture material Bout through the output multiplex unit 307 to drive and cause the liquid crystal display panel 201 to display a black picture. In addition, the seventh load signal TP provided by the timing controller 203 After the enable level 401 occurs (that is, the number of occurrences of the enable level 401 has reached a preset number of times) or the time elapsed since the load signal TP has reached the preset time T, the source driver 205 transmits more through the output. The unit 307 starts outputting the real image frame data Dout to the liquid crystal display panel 201 so that the liquid crystal display panel 201 displays the image screen. In particular, the output multiplex unit 307 of the present embodiment can also be any switching component having a signal switching function or a related circuit having an equivalent function. Those skilled in the art can select or design the switching according to the actual operating conditions. element.

In practice, the image picture data Dout generated by the image picture data generating unit 301 of the source driver 205 is still output synchronously with the load signal TP (as can be seen from the top and bottom waveforms in FIG. 4), but due to the implementation For example, the counting unit 305 starts to receive the loading signal TP after the liquid crystal display 200 is turned on, so as to start counting the number of occurrences of the loading signal TP enabling level 401 or calculating whether a predetermined time T has elapsed. In this way, the image picture data generating unit 301 generates the image image data Dout before the occurrence of the seventh enabling level 401 of the loading signal TP or before the time that the loading signal TP has elapsed for a preset time T. Can be regarded as incorrect image data (for example, when the liquid crystal display is initially turned on and the reset operation is not completed, the source drive internal register retains part of the image data of the liquid crystal display before the shutdown or Some residual noise signals). The image data that is regarded as incorrect will not be output until the 7th enable level 401 of the load signal TP appears or the time elapsed after the load signal TP has elapsed for a preset time T. The liquid crystal display panel 201, in other words, as shown in FIG. 4, the source driver 205 of the embodiment, Through the operation of the output multiplex unit 307, when the 7th enable level 401 of the loading signal TP appears or the time elapsed after loading the signal TP has reached a preset time T, the image is taken from the image. Dout generated by the picture data generating unit 301, and the Dout (shown in the lowermost waveform of FIG. 4) is supplied to the data line of the liquid crystal display panel 201 through the output multiplexing unit 307 to display the correct image frame, that is, Before the occurrence of the seventh enable level 401 of the load signal TP or before the time that the load signal TP has elapsed for less than a predetermined time T, the image picture data Dout source generated by the image picture data generating unit 301 The driver 205 will not be provided to the liquid crystal display panel; and the black screen will be used before the 7th enable level 401 of the loading signal TP appears or the time required to load the signal TP does not reach a preset time T The data generating unit 303 generates the black screen material Bout to the liquid crystal display panel 201, that is, the Bout period shown in the lowermost waveform of FIG. 4, and the source driver 205 supplies the black screen material Bout to the liquid crystal display panel 201 through the output multiplexing unit 307. In this way, the source driver 205 can continue to output the black image data Bout before the correct image image data Dout is written into the liquid crystal display panel 201 to cause the liquid crystal display panel 201 to display a black image, thereby greatly improving the startup of the conventional display when the power is turned on. The phenomenon of straight stripes. On the other hand, after the occurrence of the seventh enabling level 401 of the loading signal TP or the time that the loading signal TP has elapsed has reached a predetermined time T, the image frame data generating unit 301 generates an image frame. The data Dout is given to the liquid crystal display panel 201 (as can be seen from the bottom waveform of Fig. 4), and can be regarded as the correct image frame data.

It can be seen that when the liquid crystal display 200 is initially turned on, the embodiment The true (correct) image data Dout output by the source driver 205 will not be output to the liquid crystal display panel 201 at the same time as the first enable level 401 of the loading signal TP appears, and the black image data Bout is also The conventional technique is not directly provided by the image frame data generating unit, but is additionally provided by the black screen data generating unit 303, that is, the generating mechanism or source of the image frame data Dout and the black screen data Bout are not the same. Therefore, even if the source driver 205 is initially turned on in the liquid crystal display 200 and the reset operation is not completed, the gate driver 207 does not sequentially scan the signals to turn on the column pixels of the liquid crystal display panel 201, and the liquid crystal display panel 201 The various factors of leakage current caused by the active elements of the pixels (such as thin film transistors, TFTs) are not caused by the phenomenon that the liquid crystal display 201 is turned on at the initial startup.

It is to be noted that the preset number of times mentioned in the above exemplary embodiment is described by taking 7 times as an example, but the present invention is not limited thereto. In other words, the user can determine the value of the preset number of times according to the actual design requirements. In general, the preset number of times can be designed to be greater than 3. Preferably, the preset number of times can be designed to be greater than 6 and less than 10, but not limited thereto. In addition, the method for starting the preset number of times in the present invention refers to starting from when the liquid crystal display 200 is turned on, when the counting unit 305 starts receiving the loading signal TP. The so-called boot event or initial boot event in the present invention means that the display screen is turned on again after being turned off, and the display screen here may be a display screen connected to the host computer or a display screen integrated with the host computer or The TV displays a screen, etc. That is, the source driver in the liquid crystal display 200 is not mentioned before the liquid crystal display 200 is turned on. For any image picture data Dout signal to the data line of the liquid crystal display panel 201.

In addition, in the above exemplary embodiment, the counting unit 305, the output multiplexing unit 307, and the black screen data generating unit 303 are disposed in the source driver, but in another exemplary embodiment, the components may be disposed in other Appropriate (for example, set in the Tcon board) or integrated into other components. In addition, the architecture shown in FIG. 3 is an implementation manner of the driving method of the present invention, and the hardware design architecture of the present invention is not limited to the design shown in FIG. 3, and any of the structures disclosed in the present invention can be generated. The hardware design of the driving method is applicable.

FIG. 5 is a flow chart of a driving method of a liquid crystal display according to an exemplary embodiment of the invention. Referring to FIG. 5, the driving method of the liquid crystal display of the exemplary embodiment includes: providing a periodic loading signal when the liquid crystal display is initially turned on (step S501); then, when the liquid crystal display is initially turned on, starting to load The number of occurrences of the signal enable level is counted and it is judged whether the preset number of times has been reached, or whether the load signal has passed the preset time (step S503).

In the present exemplary embodiment, when the judgment or the detection result in step S503 is that the number of times the load signal enable level has occurred has reached a preset number of times, or the load signal has passed the preset time, the image frame is output. The data is displayed to the liquid crystal display panel to display the correct image screen (step S505). On the other hand, when the judgment or the detection result in step S503 is that the number of times the load signal enable level occurs does not reach the preset number of times, or the load signal has not passed the preset time, the black screen data is output to the liquid crystal display. Panel to display black screen (step Step S507).

In summary, the present invention mainly delays the loading signal used by the timing controller to control the output image data of the source driver when the liquid crystal display is initially turned on, so that the image data outputted by the source driver is not Synchronous output. In this way, in the process of delaying the loading of the signal output by the timing controller, the source driver outputs black screen data to drive and cause the liquid crystal display panel to display a black screen. Therefore, the liquid crystal display of the present invention does not appear to be turned on at the initial startup.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

200‧‧‧LCD display

201‧‧‧LCD panel

203‧‧‧ timing controller

205‧‧‧Source Driver

207‧‧ ‧ gate driver

209‧‧‧Backlight module

301‧‧‧Image picture data generation unit

303‧‧‧Black picture data generation unit

305‧‧‧counting unit

307‧‧‧Output multiplex unit

401‧‧‧Load signal enable level

TP‧‧‧Load signal

Dout‧‧‧ video image data

Bout‧‧‧ black screen data

VS‧‧‧ video signal

SS‧‧‧Select signal

T‧‧‧Preset time

S501~S507‧‧‧ respective steps of the driving method of the liquid crystal display according to an exemplary embodiment of the present invention

FIG. 1 is a schematic diagram of a load signal TP and a video frame data Dout of a conventional synchronous output.

FIG. 2 is a block diagram of a system of a liquid crystal display 200 according to an exemplary embodiment of the invention.

FIG. 3 is a block diagram of a source driver 205 according to an exemplary embodiment of the present invention.

FIG. 4 is a schematic diagram of a load signal TP, a video image data Dout, and a black screen data Bout according to an exemplary embodiment of the present invention.

FIG. 5 illustrates a liquid crystal display drive according to an exemplary embodiment of the present invention. Method flow chart.

205‧‧‧Source Driver

301‧‧‧Image picture data generation unit

303‧‧‧Black picture data generation unit

305‧‧‧counting unit

307‧‧‧Output multiplex unit

TP‧‧‧Load signal

Dout‧‧‧ video image data

Bout‧‧‧ black screen data

VS‧‧‧ video signal

SS‧‧‧Select signal

Claims (20)

A liquid crystal display comprising: a liquid crystal display panel; a timing controller for providing a periodic load signal when the liquid crystal display is initially turned on; and a source driver coupled to the liquid crystal display panel and the timing The controller is configured to start receiving the loading signal when the liquid crystal display is initially turned on, and start counting the number of times the loading signal is enabled to reach a preset number of times or detecting that the loading signal has passed through After a preset time, outputting an image data to the liquid crystal display panel to display an image image, wherein the loading signal is used to control the source driver to output the image data to the liquid crystal display panel. The source driver does not output the image frame data to the liquid crystal display panel immediately after the first enable level of the load signal appears, and the source driver passes the load signal. The image frame data is output to the liquid crystal display panel after the preset number of enable levels or the load signal has undergone the preset time. During the period from the start of receiving the loading signal to the beginning of outputting the image data to the liquid crystal display panel, the source driver provides a black screen material to the liquid crystal display panel to enable the The LCD panel displays a black screen. The liquid crystal display of claim 1, wherein the source driver counts the number of occurrences of the load signal enable level. When the preset number of times is not reached or the preset time is detected, the source driver outputs the black screen data to drive and cause the liquid crystal display panel to display the black screen. The liquid crystal display of claim 2, wherein the source driver comprises: an image data generating unit coupled to the timing controller for receiving and transmitting a video signal provided by the timing controller Processing, to generate the image data; a black image data generating unit for generating the black image data; a counting unit coupled to the timing controller for receiving and displaying the loading signal enable level Counting the number of times or detecting the time elapsed from the loading of the signal, and outputting a selection signal; and an output multiplex unit coupled to the image data generating unit, the black screen data generating unit, and the counting unit, And receiving the selection signal, the image frame data and the black screen data, and determining to output the image frame data or the black screen data according to the selection signal. The liquid crystal display of claim 3, wherein the counting unit counts the number of times the loading signal is enabled to reach the preset number of times or detects that the loading signal has experienced the pre-processing. When the time is set, the counting unit outputs the selection signal of a first logic state. The liquid crystal display of claim 4, wherein the output multiplex unit outputs the image frame data when the counting unit outputs the selection signal of the first logic state. The liquid crystal display of claim 4, wherein The counting unit counts the number of occurrences of the load signal enable level and does not reach the preset number of times or detects that the load signal has not experienced the preset time, the counting unit outputs a second logic state. The selection signal. The liquid crystal display of claim 6, wherein the output multiplex unit outputs the black screen data when the counting unit outputs the selection signal of the second logic state. The liquid crystal display of claim 6, wherein the first logic state is a logic high level and the second logic state is a logic low level. The liquid crystal display of claim 6, wherein the first logic state is a logic low level and the second logic state is a logic high level. The liquid crystal display of claim 1, wherein the preset number of times is greater than 6 and less than 10. A driving method of a liquid crystal display, comprising: providing a periodic loading signal when the liquid crystal display is initially turned on; and when the liquid crystal display is initially turned on, a source driver of the liquid crystal display starts to generate the loading signal The number of occurrences of the level can be counted to reach a preset number of times or after the preset time is detected, the image data is output to a liquid crystal display panel to display an image image on the liquid crystal display panel. The loading signal is used to control the source driver to output the image data to the liquid crystal display panel. The source driver does not output the image frame data to the liquid crystal display panel immediately after the first enable level of the load signal appears, and the source driver passes the load signal. The image frame data is output to the liquid crystal display panel after the preset number of times of the enable level or the load signal has passed the preset time, wherein the source driver receives the load signal from the beginning to start outputting During the period from the image data to the liquid crystal display panel, the source driver provides a black screen material to the liquid crystal display panel to cause the liquid crystal display panel to display a black screen. The driving method of the liquid crystal display device of claim 11, further comprising: counting the number of occurrences of the load signal enable level without reaching the preset number of times or detecting the loading signal When the preset time is elapsed, the black screen material is output to drive and cause the liquid crystal display panel to display the black screen. The driving method of the liquid crystal display according to claim 11, wherein the preset number of times is greater than 6 and less than 10. A liquid crystal display comprising: a liquid crystal display panel; a timing controller for providing a periodic load signal when the liquid crystal display is initially turned on; and a source driver comprising an image picture data generating unit, The source driver is coupled to the liquid crystal display panel and the timing controller, and when the source driver initially receives the loading signal, the image frame data generating unit Correspondingly generating an image frame data, the source driver starts counting the number of occurrences of the load signal enable level, and the count reaches a preset number of times or detects that the load signal has passed a preset time And outputting the image data to the liquid crystal display panel, so that the liquid crystal display panel displays an image image, wherein the loading signal is used to control the source driver to output the image data to the liquid crystal display panel, wherein The source driver does not output the image frame data to the liquid crystal display panel immediately after the first enable level of the load signal appears, and the source driver passes the preset at the load signal. The image frame data is output to the liquid crystal display panel after the preset enable time has elapsed, and the source driver starts to receive the image from the start receiving the load signal. During the period from the screen data to the liquid crystal display panel, the source driver provides a black screen material to the liquid crystal display panel to display the liquid crystal display panel. Show a black picture. The liquid crystal display of claim 14, wherein the source driver further comprises a black screen data generating unit for generating the black screen data, and the source driver is enabled to the loading signal. When the number of times is counted but the preset number of times has not been reached or the preset time is detected, the source driver outputs the black screen data to drive and cause the liquid crystal display panel to display the black screen. The liquid crystal display of claim 15, wherein the source driver further comprises: a counting unit coupled to the timing controller for receiving and counting the number of occurrences of the load signal enable level or detecting the time elapsed during the loading of the signal, and outputting a selection signal accordingly; An output multiplex unit coupled to the image data generating unit, the black screen data generating unit, and the counting unit for receiving the selection signal, the image frame data and the black screen data, and determining according to the selection signal The image frame data or the black frame data is output. The liquid crystal display of claim 16, wherein the counting unit counts the number of times the loading signal is enabled to reach the preset number of times or detects that the loading signal has experienced the pre-processing. When the time is set, the counting unit outputs the selection signal of a first logic state, so that the output multiplex unit outputs the image frame data. The liquid crystal display of claim 17, wherein the counting unit counts the number of occurrences of the load signal enable level without reaching the preset number of times or detects that the load signal has not experienced the When the time is preset, the counting unit outputs the selection signal of a second logic state, so that the output multiplex unit outputs the black screen data. The liquid crystal display of claim 17, wherein the first logic state is one of a logic high level and a logic low level, and the second logic state is the logic high level and the logic Another low level. The liquid crystal display of claim 14, wherein the preset number of times is greater than 6 and less than 10.