TWI769616B - Driving method and driving device of scanning display - Google Patents

Abstract

A driving method of a scanning display is performed by a driving module and includes the following steps: receiving and temporarily storing an image stream; receiving a synchronization control signal; according to the synchronization control signal, the image stream and a correlation generating and outputting a first driving signal to the scanning display according to the clock signal of the line scanning switching of the scanning display, so that the scanning display emits light in a line scanning manner; and according to the synchronization control signal and the first driving signal The driving signal is output to generate an image update signal, and the image update signal is related to the image update of the scanning display.

Description

Driving method and driving device of scanning display

The present invention relates to a driving method and device, in particular to a driving method and a driving device for driving a scanning display.

A conventional driving device for driving a scanning display to display images includes a control module and a driving module. The driving module receives a synchronization control signal related to image display and updating from the control module, and receives an image stream from the control module. The image stream has a plurality of image data related to the picture to be displayed by the scanning display. The driving module drives the scanning display according to the synchronization control signal and the image stream, so that a backlight module including a light-emitting diode array in the scanning display is controlled by the synchronization control signal. At the same time, it becomes brighter or darker, and a display module in the scanning display performs image display and update of the image data of the image stream according to the frequency of the synchronization control signal. The synchronization control signal is a vertical synchronization (V-sync) periodic signal, and its frequency is, for example, 60 Hz, that is to say, the scanning display periodically updates the displayed picture. a screen frame rate and the synchronization control signal the same frequency.

However, when the synchronization control signal is an aperiodic signal, and the backlight module is a scanning backlight module that is triggered by the synchronization control signal and adopts scanning control to emit light row by row in sequence, the above-mentioned conventional scanning display The driving method may cause tearing or interruption of the picture displayed by the display module. Therefore, there is still room for improvement in the driving method of the existing scanning display.

Therefore, an object of the present invention is to provide a driving method for a scanning display that can avoid tearing or interruption of the screen displayed by the scanning display.

Therefore, the driving method of the scanning display of the present invention is performed by a driving module, and the driving method of the scanning display comprises the following steps: (A) receiving and temporarily storing an image stream from a control module; ( B) receiving a synchronization control signal from the control module; (C) generating and outputting a first clock signal according to the synchronization control signal, the image stream and a clock signal related to the line scan switching of the scanning display A driving signal is output to the scanning display, so that the scanning display emits light in a line scanning manner; and (D) according to the synchronization control signal and the first driving signal output, an image update signal is generated, the image update signal Image updates related to the scanning display.

Therefore, another object of the present invention is to provide a driving device for a scanning display that can avoid tearing or interruption of the screen displayed by the scanning display.

Therefore, in the driving device of the scanning display of the present invention, the scanning display includes a backlight module and a display module, and the driving device of the scanning display includes a control module and a driving module.

The control module generates an image stream and a synchronization control signal.

The driving module is used to electrically connect the backlight module and the display module, and is electrically connected to the control module to receive the synchronization control signal and the image stream, and to receive the synchronization control signal and the image stream according to the synchronization control signal and the image stream. and a clock signal related to the line scan switching of the backlight module, generating and outputting a first driving signal to the backlight module, so that the backlight module emits light in a line scan mode, and also according to the synchronization control signal and the output of the first driving signal to generate an image update signal, and the image update signal is related to the image update of the display module.

The effect of the present invention is: by performing image display and update according to the image update signal, the screen displayed by the display module can be prevented from being suddenly cut off due to the synchronization control signal, so that the display module will not have an image A tear or break occurs.

1: Scanning Display

11: Backlight module

111~114: Scan switch

115: Light Emitting Diode Array

116: Light Emitting Diode

12: Display module

2: drive unit

21: Control module

22: Driver module

221: scratchpad

222: drive signal generator

223: drive signal generator

224: Phase Locked Loop Circuit

31~36: Steps

341~343: Substeps

D1~Dn: drive signal

Do: The second drive signal output

Dr: Image Streaming

Draw: Image data

SW1~SW4: switch signal

t: time

V _LED : Input voltage

Vr: Image update signal

Vsync: Synchronization control signal

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, wherein: 1 is a circuit block diagram illustrating an embodiment of a driving device for a scanning display of the present invention; FIG. 2 is a flowchart illustrating a driving method for a scanning display performed by a driving module of the embodiment; and FIG. 3 It is a timing diagram illustrating an image stream, a synchronization control signal, an image update signal, and a plurality of switching signals of this embodiment.

Referring to FIG. 1 to FIG. 3 , an embodiment of the driving device 2 of the scanning display 1 of the present invention is suitable for driving the scanning display 1 to display images. The scanning display 1 (eg, a liquid crystal display) supports a dynamic frame rate and includes a backlight module 11 and a display module 12 (eg, a liquid crystal display panel). The backlight module 11 includes four scan switches 111 - 114 (this embodiment is exemplified, but not limited thereto) and a light emitting diode (LED) array 115 . Each of the scan switches 111 - 114 (eg, a P-type MOSFET) has a first terminal for receiving the input voltage VLED, an electrical connection to the _LED array 115 the second terminal, and a control terminal. It should be noted that, FIG. 1 depicts the scan switches 111 to 114 in the backlight module 11 , but does not mean that the scan switches 111 to 114 must be disposed in the backlight module 11 during manufacture. In fact, during manufacture, the scanning switches 111 to 114 can also be arranged in the driving device 2 , or independently arranged outside the scanning display 1 and the driving device 2 .

In this embodiment, the driving device 2 of the scanning display 1 includes a control module 21 and a driving module 22 .

The control module 21 generates a synchronization control signal Vsync, and an internal graphics processing unit (GPU, not shown) generates an image stream Dr with a plurality of image data Draw. The image stream Dr is related to the picture to be displayed by the display module 12 . In this embodiment, the control module 21 sequentially outputs the image data as the image stream Dr.

The driving module 22 is electrically connected to the backlight module 11 and the display module 12, and is electrically connected to the control module 21 to receive the synchronization control signal Vsync and the image stream Dr, and to drive the backlight accordingly The module 11 and the display module 12 . In this embodiment, the driving module 22 includes a register 221 electrically connected to the control module 21 and used for receiving and temporarily storing the image stream Dr, and a driving signal generator 222 (ie, the first driving signal generator), and a driving signal generator 223 (ie, the second driving signal generator). The driving signal generator 222 is electrically connected to the backlight module 11 , the control module 21 and the register 221 , and is used for driving the backlight module 11 , and has a phase-locked loop circuit 224 . The phase-locked loop circuit 224 generates a clock signal related to the line-to-scan switching of the backlight module 11 . The driving signal generator 223 is electrically connected to the display module 12 , the driving signal generator 222 and the register 221 , and is used for driving the display module 12 . It should be noted that the driving signal generator 223 includes a source driver and a gate driver The driving circuit of the actuator is well known to those skilled in the art, so it is not repeated here. In addition, FIG. 1 depicts the driving signal generators 222 and 223 in the driving module 22, but it does not mean that the driving signal generators 222 and 223 together form a single driving chip during manufacture. In practice, the driving signal generators 222 and 223 can be two separate driving chips.

In detail, the driving module 22 executes a scanning display driving method including the following steps 31-36, so as to drive the scanning display 1 to perform image display and update.

In step 31 , the phase-locked loop circuit 224 of the driving signal generator 222 of the driving module 22 generates the clock signal.

In step 32, the register 221 of the driving module 22 receives the image stream Dr from the control module 21, and temporarily stores the image stream Dr.

In step 33, the driving signal generator 222 of the driving module 22 receives the synchronization control signal Vsync and the image stream Dr from the control module 21 and the register 221, respectively.

In step 34, the driving signal generator 222 of the driving module 22 generates and outputs a The first driving signal is output to the backlight module 11, so that the backlight module 11 emits light in a line scanning manner. In this embodiment, the first driving signal output includes a plurality of switching signals SW1-SW4, and a plurality of driving signals D1-Dn, The switching signals SW1 ˜ SW4 are shown in FIG. 3 , but are not limited thereto. This step 34 includes the following sub-steps 341-343.

In sub-step 341, the driving signal generator 222 generates the switching signals SW1-SW4 according to the synchronization control signal Vsync and the clock signal. In this embodiment, each of the switching signals SW1 ˜ SW4 is a pulse signal with a plurality of square waves, and the pulse width thereof is an integer multiple of a period of the clock signal. In each line scanning period of the backlight module 11 , the pulse waves of the switching signals SW1 - SW4 are interlaced. In addition, the first pulse of the synchronization control signal Vsync triggers the switching of the switching signals SW1 ˜ SW4 .

In sub-step 342, the driving signal generator 222 generates the driving signals D1-Dn according to the image stream Dr and the clock signal. In this embodiment, each of the driving signals D1 ˜Dn is a pulse wave signal having a plurality of square waves, and the pulse wave width thereof is an integer multiple of the period of the clock signal, and the The integer multiple varies with the image stream Dr.

In sub-step 343, the driving signal generator 222 outputs the switching signals SW1-SW4 to the control terminals of the scan switches 111-114 respectively, and outputs the driving signals D1-Dn to the light-emitting two The cathodes of the plurality of light-emitting diodes 116 corresponding to each of the polar body arrays 115 are used to drive the light-emitting diode arrays 115 of the backlight module 11 to emit light row by row. It should be noted that each row in the light-emitting diode array 115 of the backlight module 11 that emits light row by row is defined as a row in the light-emitting diode array 115 Each column (ie, each horizontal row) of light emitting diodes 116 .

In step 35, the driving signal generator 222 of the driving module 22 generates and outputs an image update signal Vr to the driving signal generator 223 according to the synchronization control signal Vsync and the first driving signal output. The image update signal Vr is related to the image update of the display module 12 of the scanning display 1 .

In this embodiment, the driving signal generator 222 generates the image update signal Vr according to the synchronization control signal Vsync and the last switching signal (ie, the switching signal SW4 ) among the switching signals SW1 ˜ SW4 . The last switching signal SW4 corresponds to the last line of the line scanning performed by the scanning display 1 when emitting light. Each of the synchronization control signal Vsync and the image update signal Vr is a pulse wave signal with a plurality of square waves. The driving signal generator 222 generates the image update signal Vr in such a way that each square wave of the image update signal Vr lags behind a corresponding square wave of the synchronization control signal Vsync, and the image update signal Vr except for A start point of each square wave other than the first square wave coincides with an end point of the square wave of the switching signal SW4 (ie, the last switching signal of the switching signals SW1 ˜ SW4 ). The end point of the square wave of the switching signal SW4 occurs immediately after a start point of the corresponding square wave of the synchronization control signal Vsync.

In step 36, the driving signal generator 223 of the driving module 22 generates and outputs a second driving signal output according to the image update signal Vr and the image stream Dr temporarily stored in the register 221 Do to the display module of the scanning display 1 12, to drive the display module 12 to perform image display and update in a way according to the second drive signal output Do, so that the display module 12 follows the change of the image update signal Vr to update the displayed image. picture.

It should be added that, in this embodiment, step 31 is performed before step 32, but it is not limited thereto. In other embodiments, step 31 may also be performed between step 32 and step 33 , or performed between step 33 and step 34 .

To sum up, the driving method of the scanning display of the present invention is to enable the display module 12 to update the displayed image according to the change of the image update signal Vr, that is, the display module 12 displays The picture in will update its displayed picture after the last line corresponding to the backlight module 11 is over (ie, corresponding to an end point of a corresponding one of the square waves of the switching signal SW4) Therefore, the picture displayed by the display module 12 will not be updated when the line scan corresponding to the backlight module 11 is not finished due to the synchronization control signal Vsync, so that the picture displayed by the display module 12 can be prevented from being suddenly cut off. There is a situation of image tearing or interruption, so that the driving method of the scanning display of the present invention is compared with the driving method of the existing display (which causes image tearing or interruption according to the synchronization control signal Vsync to display and update the image) , with better picture display.

However, the above are only examples of the present invention, and should not limit the scope of implementation of the present invention. Any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the contents of the patent specification are still included in the scope of the present invention. The scope of the invention patent Inside.

31~36: Steps

341~343: Substeps

Claims (12)

A driving method of a scanning display is performed by a driving module, and the driving method of the scanning display comprises the following steps: (A) receiving and temporarily storing an image stream from a control module; (B) receiving a synchronous control signal from the control module; (C) generating and outputting a first driving signal to the scanning display according to the synchronization control signal, the image stream and a clock signal related to the line-scan switching of the scanning display, so that the scanning display The display emits light in a line scan manner; and (D) According to the synchronization control signal and the output of the first driving signal, an image update signal is generated, and the image update signal is related to the image update of the scanning display. The driving method for a scanning display according to claim 1, wherein the first driving signal output includes a plurality of switching signals, and in step (D), the driving module is based on the synchronization control signal and the switching signals The last switching signal in the image update signal is generated, and the last switching signal corresponds to the last line of the line scanning performed by the scanning display when emitting light. The driving method of a scanning display as claimed in claim 2, wherein each of the switching signals, the synchronization control signal and the image update signal is a pulse wave signal having a plurality of square waves, and the image update signal is a pulse wave signal. Each square wave lags behind a corresponding square wave of the synchronization control signal, and a start point of each square wave of the image update signal coincides with an end point of a square wave of the last switching signal, the last switching signal being the same. The end point of the square wave occurs immediately after the start point of the corresponding square wave of the synchronization control signal. The driving method for a scanning display according to claim 1, after step (D), further comprising step (E) generating and outputting a second driving signal according to the image update signal and the image stream to output to The scanning display is used to drive the scanning display to display and update the image, so that the scanning display can update the displayed image following the change of the image update signal. The driving method for a scanning display according to claim 1, before the step (C), further comprises a step (F) of generating the clock signal. The driving method for a scanning display according to claim 1, wherein the first driving signal output includes a plurality of switching signals and a plurality of driving signals, and step (C) includes the following sub-steps, (C1) generating the switching signals according to the synchronization control signal and the clock signal, (C2) generating the drive signals according to the image stream and the clock signal, and (C3) transmitting the switching signals and the driving signals to the scanning display to drive the scanning display to emit light. A driving device of a scanning display, the scanning display comprises a backlight module and a display module, and the driving device of the scanning display comprises: a control module that generates an image stream and a synchronization control signal; and a driving module for electrically connecting the backlight module and the display module, and electrically connecting to the control module to receive the synchronization control signal and the image stream, and to receive the synchronization control signal and the image stream according to the synchronization control signal and the image stream stream and a clock signal related to the line scan switching of the backlight module, generate and output a first driving signal to the backlight module, so that the backlight module emits light in a line scan mode, and is also controlled according to the synchronization The signal and the first driving signal are output to generate an image update signal, and the image update signal is related to the image update of the display module. The driving device of the scanning display according to claim 7, wherein the first driving signal output includes a plurality of switching signals, and the driving module is based on the synchronization control signal and the last switching signal among the switching signals, The image update signal is generated, and the last switching signal corresponds to the last line of the line scan performed by the backlight module when emitting light. The driving device for a scanning display as claimed in claim 8, wherein each of the switching signals, the synchronization control signal and the image update signal is a pulse wave signal having a plurality of square waves, and the image update signal is Each square wave lags behind a corresponding square wave of the synchronization control signal, and a start point of each square wave of the image update signal coincides with an end point of a square wave of the last switching signal, the last switching signal being the same. The end point of the square wave occurs immediately after the start point of the corresponding square wave of the synchronization control signal. The driving device for a scanning display as claimed in claim 7, wherein the driving module further generates and outputs a second driving signal to the display module according to the image update signal and the image stream, so as to output a second driving signal to the display module. The display module is driven to display and update the image, so that the display module follows the change of the image update signal to update the displayed image. The driving device for a scanning display according to claim 10, wherein the driving module comprises: a first driving signal generator, electrically connected to the backlight module and the control module, and having a phase-locked loop circuit for generating the clock signal, the first driving signal generator receiving the synchronization control signal and the image stream, and generate and output the first driving signal to the backlight module according to the synchronization control signal, the image stream and the clock signal, and also output according to the synchronization control signal and the first driving signal , generating the image update signal, and a second driving signal generator, electrically connected to the first driving signal generator to receive the image update signal, and according to the image update signal and the image stream, to generate and output the second drive signal to be output to the Display modules. The driving device of the scanning display as claimed in claim 11, wherein the driving module further comprises a register, electrically connected to the control module, and the first and second driving signal generators for receiving and temporarily storing the image stream from the control module.

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