Backlight driving method and backlight driving apparatus for scanning display

Abstract

A backlight driving method and a backlight driving device for a scanning display, the backlight driving method is performed by the backlight driving device, comprising: (A) receiving image data; (B) generating an adjustment signal according to the image data; (C) generating an internal synchronization control signal according to an original synchronization control signal and a plurality of predetermined delay values, the original synchronization control signal has a square wave during an update period, the internal synchronization control signal has a plurality of square waves and each square wave has a delay time with the square wave of the original synchronization control signal, the delay time is related to a corresponding one of the predetermined delay values; and (D) generating and outputting a backlight driving signal to the scanning display according to the adjustment signal and the internal synchronization control signal, so that the light emitting sequence of the scanning display during the update period changes with the appearance of the square wave of the internal synchronization control signal, when the image data is updated to display a picture, the backlight unit does not emit light all the time, thereby effectively improving the dynamic blur phenomenon.

Description

TECHNICAL FIELD

[0001] The present invention relates to a driving method and a driving device, and particularly relates to a backlight driving method and a backlight driving device for a scanning display. BACKGROUND

[0002] In a conventional scanning display, image display is achieved by transmitting image data through data lines to control corresponding liquid crystal molecules in a liquid crystal display panel to twist, and by providing a color filter layer to provide a filtering effect, so as to realize full-color display. The liquid crystal molecules have a long twist response time. If all light emitting diodes (LEDs) in a backlight unit of the scanning display continuously emit light, the dynamic image displayed by the scanning display will cause a motion blur phenomenon to the human eye during the twist response time of the liquid crystal molecules. Therefore, the backlight driving method of the conventional scanning display still has room for improvement. SUMMARY

[0003] An object of the present invention is to provide a backlight driving method for a scanning display, which can overcome the drawbacks of the prior art.

[0004] The backlight driving method for a scanning display is performed by a backlight driving device. The backlight driving method for a scanning display comprises the following steps:

[0005] (A) receiving an image data, the image data being related to a picture displayed by the scanning display;

[0006] (B) adjusting the image data with respect to brightness and darkness of the displayed picture to generate an adjustment signal;

[0007] (C) after the adjustment signal is generated, generating an internal synchronization control signal according to an original synchronization control signal and a plurality of predetermined delay values, the original synchronization control signal being related to image update of the picture displayed by the scanning display, the original synchronization control signal having a square wave during an update period of the original synchronization control signal, the internal synchronization control signal having a plurality of square waves, each square wave of the internal synchronization control signal having a delay time with respect to the square wave of the original synchronization control signal, the delay time being related to a corresponding one of the predetermined delay values; and

[0008] (D) generating and outputting a backlight driving signal to the scanning display according to the adjustment signal and the internal synchronization control signal, so as to drive the scanning display to emit light, so that the order of light emission of the scanning display during the update period changes with the appearance of the square waves of the internal synchronization control signal.

[0009] The present application discloses a backlight driving method for a scanning display,

[0010] The starting point of the square wave of the original synchronization control signal occurs after the adjustment signal is generated, and

[0011] The time difference between the starting point of each square wave of the internal synchronization control signal and the ending point of the square wave of the original synchronization control signal is a corresponding one of the delay times.

[0012] The present application discloses a backlight driving method for a scanning display, wherein the difference between two adjacent predetermined delay values is the same.

[0013] The present application discloses a backlight driving method for a scanning display, wherein the difference between two adjacent predetermined delay values is different.

[0014] The present application discloses a backlight driving method for a scanning display, wherein the first predetermined delay value is zero.

[0015] Another object of the present application is to provide a backlight driving device that can overcome the drawbacks of the prior art.

[0016] The present application discloses a backlight driving device for a scanning display, comprising a control unit and a backlight driving unit.

[0017] The control unit is configured to receive image data related to a picture displayed by the scanning display, and adjust the image data for display picture brightness to generate and output an adjustment signal. After outputting the adjustment signal, the control unit also generates and outputs an original synchronization control signal and a plurality of predetermined delay values.

[0018] The backlight driving unit is electrically connected to the control unit to receive the adjustment signal, the original synchronization control signal, and the predetermined delay values, and generates an internal synchronization control signal according to the original synchronization control signal and the predetermined delay values. The original synchronization control signal is related to image updates of the picture displayed by the scanning display. During an update period of the original synchronization control signal, the original synchronization control signal has a square wave, and the internal synchronization control signal has a plurality of square waves. Each square wave of the internal synchronization control signal has a delay time from the square wave of the original synchronization control signal, and the delay time is related to a corresponding one of the predetermined delay values. The backlight driving unit also generates and outputs a backlight driving signal to the scanning display according to the adjustment signal and the internal synchronization control signal, to drive the scanning display to emit light, so that the light emission sequence of the scanning display during the update period changes with the appearance of the square waves of the internal synchronization control signal.

[0019] The present application discloses a backlight driving device for a scanning display,

[0020] The starting point of each square wave of the internal synchronization control signal is a time difference from the ending point of the square wave of the original synchronization control signal as a corresponding one of the delay times.

[0021] The starting point of each square wave of the internal synchronization control signal is a time difference from the ending point of the square wave of the original synchronization control signal as a corresponding one of the delay times.

[0022] The present application provides a backlight driving device, wherein the difference between two adjacent predetermined delay values is the same.

[0023] The present application provides a backlight driving device, wherein the difference between two adjacent predetermined delay values is different.

[0024] The present application provides a backlight driving device, wherein the first predetermined delay value is zero.

[0025] The present application provides a backlight driving device, wherein the first predetermined delay value is zero. BRIEF DESCRIPTION OF DRAWINGS

[0026] Other features and effects of the present application will be apparent from the embodiments described below with reference to the drawings.

[0027] Figure 1 FIG. 1 is a block diagram illustrating an embodiment of a backlight driving device of a scanning display according to the present application;

[0028] Figure 2 FIG. 2 is a flow chart illustrating a backlight driving method of the scanning display according to the present application, which is performed by the backlight driving device of the embodiment;

[0029] Figure 3 FIG. 3 is a timing chart illustrating an original synchronization control signal, an adjustment signal output timing, and an internal synchronization control signal of the embodiment; DETAILED DESCRIPTION

[0030] Reference will now be made to Figure 1An embodiment of the backlight driving device 2 of the scanning display 1 of the present application is adapted to drive the scanning display 1. The scanning display 1 is a liquid crystal display (LCD) and supports a dynamic frame rate, and includes a backlight unit 11, a liquid crystal driving unit 12, and a liquid crystal display panel 13. The backlight driving device 2 performs the backlight driving method of the scanning display 1 of the present application to drive the backlight unit 11 to emit light.

[0031] The backlight unit 11 includes a plurality of switches (not shown) and a light emitting diode array (not shown) including a plurality of light emitting diodes (LEDs). The configuration of the backlight unit 11 is well known to those skilled in the art, and thus will not be described in detail herein.

[0032] In this embodiment, the backlight driving device 2 includes a control unit 21 electrically connected to the liquid crystal driving unit 12, and a backlight driving unit 22 electrically connected between the control unit 21 and the backlight unit 11.

[0033] The control unit 21 is adapted to receive a serial input signal SDI having an image stream. The image stream is composed of a plurality of image data sequentially transmitted. Each image data is associated with a frame displayed by the liquid crystal display panel 13 of the scanning display 1. During the update and display of each frame by the liquid crystal display panel 13, each image data serves as data required for the twisting of a plurality of liquid crystal molecules in the liquid crystal display panel 13. In other words, the control unit 21 sequentially receives and outputs the image data to the liquid crystal driving unit 12, so that the liquid crystal driving unit 12 sequentially controls the twisting of the liquid crystal molecules in the liquid crystal display panel 13 according to each image data to display a frame corresponding to a corresponding one of the image data. This is well known to those skilled in the art, and thus will not be described in detail herein.

[0034] Further referring to Figure 2 and Figure 3 In this embodiment, the control unit 21 cooperates with the backlight driving unit 22 to repeatedly perform a backlight driving method including steps 31-35 according to each image data of the image stream of the serial input signal SDI to drive the backlight unit 11 to emit light.

[0035] In step 31, the control unit 21 receives the image data.

[0036] In step 32, the control unit 21 adjusts the image data with respect to the brightness of the displayed frame to generate an adjustment signal Dr. Figure 3The symbol As shown is a timing of an adjustment signal output related to the output of the adjustment signal Dr.

[0037] In step 33, after the adjustment signal Dr is generated, the control unit 21 generates and outputs an original synchronization control signal EVsync and predetermined delay values Dei-Den. The original synchronization control signal EVsync is related to image update of the picture displayed by the liquid crystal display panel 13.

[0038] In step 34, the backlight drive unit 22 generates an internal synchronization control signal IVsync based on the original synchronization control signal EVsync and the predetermined delay values Dei-Den.

[0039] In the present embodiment, during an update period T of the original synchronization control signal EVsync, the original synchronization control signal EVsync has a square wave, and the internal synchronization control signal IVsync has three square waves (but not limited to this, each square wave of the internal synchronization control signal IVsync is related to control of a part of the row light emitting diodes (row defined as a horizontal row in the array) of the light emitting diode array in the backlight unit 11). The update period T is as shown by the time point tl to the time point t3, but not limited to this. In other embodiments, the update period T can be as shown by the time point t2 to the time point t4. Figure 3 Figure 3

[0040] ​​In detail, in the present embodiment, the number of the predetermined delay values is three (i.e., the predetermined delay values De1-De3), but is not limited thereto. The backlight driving unit 22 generates the three square waves of the internal synchronization control signal IVsync according to the original synchronization control signal EVsync and the three predetermined delay values De1-De3. The start point of the square wave of the original synchronization control signal EVsync occurs after the generation of the adjustment signal Dr. The start point of each of the three square waves of the internal synchronization control signal IVsync occurs after the generation of the adjustment signal Dr. Each of the square waves of the internal synchronization control signal IVsync has a delay time with respect to the square wave of the original synchronization control signal EVsync, and the delay time corresponds to a corresponding one of the three predetermined delay values De1-De3. In detail, the start point of each of the three square waves of the internal synchronization control signal IVsync has a time difference t1, t2, t3 with respect to the end point of the square wave of the original synchronization control signal EVsync, and the time difference t1, t2, t3 corresponds to a corresponding one of the delay times. It is noted that, in the present embodiment, adjacent two of the three predetermined delay values De1-De3 have a same difference value (i.e., adjacent two of the time differences t1-t3 have a same difference value), but are not limited thereto. In other embodiments, each of the difference values is different (i.e., adjacent two of the time differences t1-t3 have different difference values), or the first predetermined delay value De1 of the three predetermined delay values De1-De3 is zero (i.e., the time difference t1 is zero).

[0041] In step 35, the backlight driving unit 22 generates and outputs a backlight driving signal output Do to the backlight unit 11 of the scanning display 1 according to the adjustment signal Dr and the internal synchronization control signal IVsync, so as to drive the backlight unit 11 to emit light, so that the scanning light-emitting sequence of the backlight unit 11 corresponding to the picture in the update period T changes with the occurrence of the square wave of the internal synchronization control signal IVsync.

[0042] For example, the LED array of the backlight unit 11 is a 9x5 array. The three square waves of the internal synchronization control signal IVsync are respectively related to controlling the first to third row LEDs, the fourth to sixth row LEDs, and the seventh to ninth row LEDs of the LED array. Thus, when the first square wave of the three square waves of the internal synchronization control signal IVsync appears, the backlight driving unit 22 generates the backlight driving signal output Do according to the adjustment signal Dr to drive the first to third row LEDs of the backlight unit 11 to emit light. When the second square wave of the three square waves of the internal synchronization control signal IVsync appears, the backlight driving unit 22 generates the backlight driving signal output Do according to the adjustment signal Dr to drive the first to sixth row LEDs of the backlight unit 11 to emit light. When the third square wave of the three square waves of the internal synchronization control signal IVsync appears, the backlight driving unit 22 generates the backlight driving signal output Do according to the adjustment signal Dr to drive the first to ninth row LEDs of the backlight unit 11 to emit light.

[0043] In summary, the backlight driving method of the scanning display of the present application uses the predetermined delay values Dei-Den to make the internal synchronization control signal IVsync have the square waves during the update period T, so that the backlight driving unit 22 can control the light emitting sequence of the LED array of the backlight unit 11 to change with the appearance of the square waves of the internal synchronization control signal IVsync according to the backlight driving signal output Do outputted by the adjustment signal Dr and the internal synchronization control signal IVsync. Thus, when each image data update is performed on the liquid crystal display panel 13 to display a picture, the backlight unit 11 does not always continuously emit light, so that the dynamic blur phenomenon of the picture can be effectively improved, and the picture quality is improved.

[0044] The above descriptions are only the preferred embodiments of the present application, and cannot limit the scope of the present application. Any simple equivalent changes and modifications according to the claims and descriptions of the present application are still within the scope of the present application.

Claims

1. A backlight driving method for a scanning display, executed by a backlight driving device, characterized in that, The backlight driving method of the scanning display comprises the following steps: (A) receiving image data related to a picture displayed by the scanning display; (B) adjusting the image data with respect to display picture brightness to generate an adjustment signal; (C) after generating the adjustment signal, generating an internal synchronization control signal according to an original synchronization control signal and a plurality of predetermined delay values, the original synchronization control signal being related to image update of the picture displayed by the scanning display, the original synchronization control signal having a square wave during an update period of the original synchronization control signal, the internal synchronization control signal having a plurality of square waves, each square wave of the internal synchronization control signal having a delay time from the square wave of the original synchronization control signal, the delay time being related to a corresponding one of the predetermined delay values, a starting point of the square wave of the original synchronization control signal occurring after generating the adjustment signal, a time difference between a starting point of each square wave of the internal synchronization control signal and an ending point of the square wave of the original synchronization control signal being a corresponding one of the delay times; and (D) generating and outputting a backlight driving signal to the scanning display according to the adjustment signal and the internal synchronization control signal to drive the scanning display to emit light, so that the light emitting sequence of the scanning display during the update period varies with the occurrence of the square wave of the internal synchronization control signal.

2. The method of claim 1, wherein, Adjacent two of the predetermined delay values have a difference, each difference having the same size.

3. The method of claim 1, wherein the method further comprises: Adjacent two of the predetermined delay values have a difference, each difference having different size.

4. The method of claim 1, wherein, A first one of the predetermined delay values is zero.

5. A backlight driving apparatus for a scanning display, characterized by comprising: It comprises: a control unit for receiving image data related to a picture displayed by the scanning display and adjusting the image data with respect to display picture brightness to generate and output an adjustment signal, the control unit further generating and outputting an original synchronization control signal and a plurality of predetermined delay values after outputting the adjustment signal; and The backlight driving unit is electrically connected to the control unit to receive the adjustment signal, the original synchronization control signal, and the predetermined delay values, and to generate an internal synchronization control signal according to the original synchronization control signal and the predetermined delay values, the original synchronization control signal being related to an image update of a picture displayed by the scanning display, the original synchronization control signal having a square wave during an update period of the original synchronization control signal, the internal synchronization control signal having a plurality of square waves, each square wave of the internal synchronization control signal having a delay time from the square wave of the original synchronization control signal, the delay time being related to a corresponding one of the predetermined delay values, the backlight driving unit further generating and outputting a backlight driving signal to the scanning display according to the adjustment signal and the internal synchronization control signal, so as to drive the scanning display to emit light, so that a light emission sequence of the scanning display during the update period varies with the square waves of the internal synchronization control signal, a starting point of the square wave of the original synchronization control signal appearing after the adjustment signal is generated, and a time difference between a starting point of each square wave of the internal synchronization control signal and an ending point of the square wave of the original synchronization control signal being a corresponding one of the delay times.

6. A scanning backlight driving apparatus according to claim 5, wherein The predetermined delay values have a difference between adjacent two of the predetermined delay values, and each difference has a same size.

7. The backlight driving apparatus for a scanning display according to claim 5, wherein The predetermined delay values have a difference between adjacent two of the predetermined delay values, and each difference has a different size.

8. The backlight driving apparatus for a scanning display according to claim 5, wherein A first one of the predetermined delay values is zero.

Images