Backlight driving method and backlight driving module for scanning display

Abstract

A backlight driving method and a backlight driving module for a scanning display, the method is performed by the backlight driving module and includes (A) generating an original synchronization control signal and a serial input signal having an image stream and a plurality of predetermined delay values; (B) generating a plurality of delayed internal synchronization control signals according to the original synchronization control signal and the predetermined delay values, each internal synchronization control signal has a delay time with the original synchronization control signal, the delay time is related to a corresponding one of the predetermined delay values; (C) generating a plurality of delayed backlight driving signal outputs according to the serial input signal and the internal synchronization control signals; and (D) transmitting the backlight driving signal outputs to a plurality of backlight units respectively, so that the light emitting sequence of the backlight units is changed with the change of the predetermined delay values, thus, when the scanning display performs image data update to display a picture, the backlight units do not emit light all the time, and thus the dynamic blur phenomenon can be effectively improved.

Description

Technical Field

[0001] This invention relates to a driving method and module, and more particularly to a backlight driving method and backlight driving module for a scanning display. Background Technology

[0002] In existing scanning liquid crystal displays (LCDs), image display relies on data lines transmitting image signals to control the twisting of corresponding liquid crystal molecules in an internal liquid crystal display panel. This, combined with a color filter layer, provides a filtering effect to achieve full-color image display. However, the liquid crystal molecule twisting response time is long. If all the light-emitting diodes (LEDs) in the backlight module of this scanning LCD continuously emit light, the dynamic image displayed by the scanning LCD will cause motion blur to the human eye during the liquid crystal molecule twisting response period. Therefore, there is still room for improvement in the backlight driving method of existing scanning LCDs. Summary of the Invention

[0003] One object of the present invention is to provide a backlight driving method for a scanning display that can overcome the shortcomings of the prior art.

[0004] The backlight driving method for a scanning display of the present invention is executed by a backlight driving module, and the backlight driving method for the scanning display includes the following steps:

[0005] (A) Generate an initial synchronization control signal and a serial input signal having an image stream and a plurality of predetermined delay values, the initial synchronization control signal being related to the image update of the screen displayed on the scanning display.

[0006] (B) Based on the original synchronization control signal and the predetermined delay value, a plurality of internal synchronization control signals with delay are generated, each internal synchronization control signal having a delay time relative to the original synchronization control signal and the delay time being related to a corresponding one of the predetermined delay values.

[0007] (C) Based on the serial input signal and the internal synchronization control signal, a plurality of delayed backlight drive signal outputs are generated, wherein a backlight delay time of each backlight drive signal output is related to a predetermined delay value corresponding to a counterpart in the internal synchronization control signal; and

[0008] (D) The backlight driving signal output is transmitted to multiple backlight units of a backlight module, so that when the scanning display updates image data to display the screen, the light emission order of the backlight units changes with the change of the predetermined delay value.

[0009] In the backlight driving method of the scanning display of the present invention, in step (B), the internal synchronization control signal and the original synchronization control signal each have a square wave, and a time difference between the starting point of the square wave of each internal synchronization control signal and the starting point of the square wave of the original synchronization control signal is used as the delay time.

[0010] The backlight driving method of the present invention for a scanning display includes a difference between adjacent predetermined delay values, each difference being of equal magnitude. When the scanning display updates image data to display a screen, the backlight unit emits light line by line.

[0011] The backlight driving method of the scanning display of the present invention has a difference between two adjacent predetermined delay values, and each difference is of a different magnitude.

[0012] The backlight driving method of the scanning display of the present invention has a difference between two adjacent predetermined delay values, and at least one of the differences is zero.

[0013] Another object of the present invention is to provide a backlight driving module that can overcome the shortcomings of the prior art.

[0014] The present invention provides a backlight driving module for a scanning display, which is used to drive a backlight module including multiple backlight units, and includes multiple backlight driving units.

[0015] The backlight driving units are electrically connected to the backlight units of the backlight module. Each backlight driving unit receives an original synchronization control signal and a serial input signal having an image stream and a plurality of predetermined delay values. Each backlight driving unit generates a delayed internal synchronization control signal based on a corresponding one of the predetermined delay values ​​and the original synchronization control signal, and generates a delayed backlight driving signal output based on the serial input signal and the internal synchronization control signal, and transmits the backlight driving signal output to a corresponding one of the backlight units, so that when the scanning display updates image data to display the screen, the light emission order of the backlight units changes with the change of the predetermined delay values.

[0016] The original synchronization control signal is related to the image update of the screen displayed on the scanning display. Each internal synchronization control signal has a delay time with the original synchronization control signal, which is related to a corresponding one of the predetermined delay values. The backlight delay time of each backlight drive signal output is related to the predetermined delay value corresponding to a corresponding one of the internal synchronization control signals.

[0017] The backlight driving module of the scanning display of the present invention further includes:

[0018] A control unit is electrically connected to the backlight driving unit, and generates the original synchronization control signal and the serial input signal, and outputs the original synchronization control signal and the serial input signal to the backlight driving unit.

[0019] The backlight driving module of the scanning display of the present invention,

[0020] The internal synchronization control signal and the original synchronization control signal each have a square wave. The time difference between the starting point of the square wave of each internal synchronization control signal and the starting point of the square wave of the original synchronization control signal is used as the delay time.

[0021] There is a difference between two adjacent predetermined delay values, and each difference is the same. When the scanning display updates the image data to display the screen, the backlight unit emits light line by line.

[0022] The backlight driving module of the scanning display of the present invention,

[0023] The internal synchronization control signal and the original synchronization control signal each have a square wave. The time difference between the starting point of the square wave of each internal synchronization control signal and the starting point of the square wave of the original synchronization control signal is used as the delay time.

[0024] There is a difference between two adjacent predetermined delay values, and each difference is of a different magnitude.

[0025] The backlight driving module of the scanning display of the present invention,

[0026] The internal synchronization control signal and the original synchronization control signal each have a square wave. The time difference between the starting point of the square wave of each internal synchronization control signal and the starting point of the square wave of the original synchronization control signal is used as the delay time.

[0027] There is a difference between two adjacent predetermined delay values, and at least one of the differences is zero.

[0028] The advantage of this invention is that by using the predetermined delay value, each internal synchronization control signal has a delay time with the original synchronization control signal, such that the backlight delay time output by each backlight drive signal is related to a corresponding one of the predetermined delay values, so that the light emission order of the backlight units changes with the change of the predetermined delay value. Thus, when the scanning display updates image data to display the screen, the backlight units do not continuously emit light, thereby effectively improving the motion blur phenomenon. Attached Figure Description

[0029] Other features and effects of the present invention will be clearly presented with reference to the embodiments in the accompanying drawings:

[0030] Figure 1 This is a block diagram illustrating an embodiment of the backlight driving module of the scanning display of the present invention;

[0031] Figures 2 to 4 This is a timing diagram illustrating the original synchronization control signal of this embodiment, and different implementation states of multiple internal synchronization control signals; and

[0032] Figure 5 This is a flowchart illustrating how the backlight driving module of this embodiment performs the backlight driving method of the scanning display of the present invention. Detailed Implementation

[0033] See Figure 1 The diagram illustrates some components of a scanning display. This scanning display is a liquid crystal display (LCD) used for displaying dynamic images (i.e., supporting a dynamic frame rate). The scanning display includes a backlight device 1, a liquid crystal display panel 2, and other necessary components (not shown).

[0034] In this embodiment, the backlight device 1 includes a backlight module 11 and a backlight driving module 12. The backlight driving module 12 executes the backlight driving method of the scanning display of the present invention to drive the backlight module 11 to emit light.

[0035] The backlight module 11 includes multiple backlight units 111 to 113 arranged in parallel in sequence. Figure 1 (Only three backlight units are shown as an example, but the number of backlight units is not limited to this.) Each backlight unit 111-113 includes multiple switches (not shown) and an array of light-emitting diodes (LEDs) including multiple light-emitting diodes (LEDs). The configuration of each backlight unit 111-113 is well known to those skilled in the art and will not be described in detail here for the sake of brevity.

[0036] The backlight driving module 12 includes a control unit 120 and three backlight driving units 121 to 123. It should be noted that each of the backlight driving units 121 to 123 is a single integrated circuit (IC). Figure 1 This example only shows three backlight driving units, but the number of backlight driving units is not limited to this. Additionally, regarding... Figure 1The control unit 120 is shown inside the backlight driving module 12, but this does not mean that the control unit 120 must be placed inside the backlight driving module 12 during manufacturing. In fact, the control unit 120 can also be independently placed outside the backlight driving module 12 during manufacturing.

[0037] The control unit 120 generates an original synchronization control signal EVsync related to the image update of the screen displayed on the liquid crystal display panel 2, and a serial input signal SDI having multiple predetermined delay values ​​De1 to De3 and an image stream. A single frame displayed on the liquid crystal display panel 2 consists of multiple image segments. Each predetermined delay value De1 to De3 corresponds to the time required for image data update of the corresponding image segment. The image stream is generated by a graphics processing unit (GPU, not shown) within the control unit 120 and is related to the screen to be displayed on the liquid crystal display panel 2. It should be noted that in this embodiment, the serial input signal SDI has three predetermined delay values ​​De1 to De3, but this is not a limitation. The number of predetermined delay values ​​corresponds to the number of backlight units in the backlight module 11.

[0038] The backlight driving units 121-123 are electrically connected to the control unit 120 to receive the serial input signal SDI and the original synchronization control signal EVsync, and are also electrically connected to the backlight units 111-113 of the backlight module 11. The backlight driving unit 121 delays the original synchronization control signal EVsync according to a predetermined delay value De1 (i.e., a corresponding value among the predetermined delay values ​​De1-De3) of the serial input signal SDI to generate a delayed internal synchronization control signal IVsync1, and generates a delayed backlight driving signal output Dr1 according to the image stream of the serial input signal SDI and the internal synchronization control signal IVsync1. The backlight driving unit 122 delays the original synchronization control signal EVsync according to a predetermined delay value De2 of the serial input signal SDI to generate a delayed internal synchronization control signal IVsync2, and generates a delayed backlight driving signal output Dr2 according to the image stream of the serial input signal SDI and the internal synchronization control signal IVsync2. The backlight driving unit 123 delays the original synchronization control signal EVsync according to the predetermined delay value De3 of the serial input signal SDI to generate a delayed internal synchronization control signal IVsync3, and generates a delayed backlight driving signal output Dr3 according to the image stream of the serial input signal SDI and the internal synchronization control signal IVsync3. The backlight delay time of the backlight driving signal output Dr1 (Dr2, Dr3) (i.e., the backlight driving unit 121 (122, 123) outputs the backlight driving signal output Dr1 (Dr2, Dr3) after delaying the backlight delay time) is related to the predetermined delay value De1 (De2, De3) corresponding to the internal synchronization control signal IVsync1 (IVsync2, IVsync3). The backlight driving units 121-123 transmit the backlight driving signal outputs Dr1-Dr3 to the backlight units 111-113 respectively, so that when the liquid crystal display panel 2 updates the image data to display the screen, the light emission order of the backlight units 111-113 changes with the change of the predetermined delay values ​​De1-De3 respectively.

[0039] It should be noted that each backlight drive signal output Dr1 to Dr3 includes multiple switching signals for switching multiple switches within a corresponding backlight unit 111 to 113, and multiple drive signals output to the cathodes of multiple light-emitting diodes within the corresponding backlight unit to adjust the brightness. This is well known to those skilled in the art and will not be described in detail here. Furthermore, in this embodiment, the control unit 120 transmits the serial input signal SDI and the original synchronization control signal EVsync to each backlight drive unit 121 to 123, but is not limited to this. In other embodiments, the control unit 120 may first transmit the serial input signal SDI and the original synchronization control signal EVsync to the backlight drive unit 121, then the backlight drive unit 121 may transmit the serial input signal SDI and the original synchronization control signal EVsync to the backlight drive unit 122, and finally the backlight drive unit 122 may transmit the serial input signal SDI and the original synchronization control signal EVsync to the backlight drive unit 123. Alternatively, the control unit 120 transmits the serial input signal SDI (or the original synchronization control signal EVsync) to each backlight driving unit 121-123, and transmits the original synchronization control signal EVsync (or the serial input signal SDI) to the backlight driving unit 121, which then transmits the original synchronization control signal EVsync (or the serial input signal SDI) to the backlight driving unit 122, and finally the backlight driving unit 122 transmits the original synchronization control signal EVsync (or the serial input signal SDI) to the backlight driving unit 123.

[0040] Further reading Figure 2 The internal synchronization control signals IVsync1 to IVsync3 and the original synchronization control signal EVsync each have a square wave. There is a delay time t1 (t2, t3) between the starting point of the square wave of the internal synchronization control signal IVsync1 (IVsync2, IVsync3) and the starting point of the square wave of the original synchronization control signal EVsync. The delay times t1 to t3 are respectively related to the predetermined delay values ​​De1 to De3 (i.e., the delay time is related to a corresponding value among the predetermined delay values ​​De1 to De3). In this embodiment, there is a difference between adjacent values ​​among the predetermined delay values ​​De1 to De3, and each difference is the same in magnitude (i.e., the predetermined delay values ​​De1 to De3 are consecutive values), such that the time difference between adjacent values ​​among the delay times t1 to t3 is the same (i.e., as shown in the figure). Figure 2As shown, t3-t2=t2-t1). Therefore, when the liquid crystal display panel 2 displays an image, the backlight units 111-113 emit light sequentially, but are not limited to this. The magnitude of each difference between adjacent values ​​in the predetermined delay values ​​De1-De3 can be different (i.e., the predetermined delay values ​​De1-De3 are non-continuous values), resulting in different time differences between adjacent values ​​in the delay times t1-t3 (i.e., such as...). Figure 3 As shown, t3-t2≠t2-t1), or at least one of the differences between adjacent values ​​of the predetermined delay values ​​De1 to De3 is zero, such that at least one time difference between adjacent values ​​of the delay times t1 to t3 is zero (for example, if the predetermined delay value De1 is less than the predetermined delay values ​​De2 and De3, and the predetermined delay values ​​De2 and De3 are the same, then...). Figure 4 As shown, t2-t1≠0, t3-t2=0, at which point the backlight units 112 and 113 emit light simultaneously. It should be noted that... Figures 2 to 4 The original synchronization control signal EVsync and the internal synchronization control signals IVsync1 to IVsync3 shown are illustrated using the single frame period displayed on the liquid crystal display panel 2 as an example, but are not limited thereto.

[0041] For details, please refer to Figure 1 and Figure 5 The backlight driving module 12 executes a backlight driving method for the scanning display of the present invention, including the steps 31 to 35, to drive the backlight units 111 to 113 of the backlight module 11 to emit light.

[0042] In step 31, the control unit 120 generates the original synchronization control signal EVsync and the serial input signal SDI.

[0043] In step 32, the control unit 120 outputs the original synchronization control signal EVsync and the serial input signal SDI to the backlight driving units 121-123.

[0044] In step 33, each of the backlight driving units 121 to 123 generates a corresponding one of the delayed internal synchronization control signals IVsync1 to IVsync3 based on a corresponding one of the predetermined delay values ​​De1 to De3 in the serial input signal SDI and the original synchronization control signal EVsync.

[0045] In step 34, each of the backlight driving units 121 to 123 generates a delayed backlight driving signal output Dr1 to Dr3 based on the corresponding one of the internal synchronization control signals IVsync1 to IVsync3 and the image stream of the serial input signal SDI.

[0046] In step 35, the backlight driving units 121-123 transmit the backlight driving signal outputs Dr1-Dr3 to the backlight units 111-113 respectively, so as to drive the backlight units 111-113 to emit light.

[0047] In summary, the backlight driving method of the scanning display of the present invention utilizes the predetermined delay values ​​De1 to De3 to generate the delayed internal synchronization control signals IVsync1 to IVsync3, so that the backlight driving units 121 to 123 respectively output the backlight driving signal output Dr1 to Dr3 with backlight delay times respectively related to the predetermined delay values ​​De1 to De3. As a result, the light emission order of the backlight units 111 to 113 changes with the predetermined delay values ​​De1 to De3. In this way, when the liquid crystal display panel 2 updates image data to display each frame, the backlight units 111 to 113 do not continuously emit light, but delay the light emission time according to the predetermined delay values ​​De1 to De3, thereby effectively improving the motion blur phenomenon of the image and thus improving the image quality.

[0048] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. Any simple equivalent changes and modifications made in accordance with the claims and description of the present invention shall still fall within the scope of the present invention.

Claims

1. A backlight driving method for a scanning display, executed by a backlight driving module, characterized in that, The backlight driving method for the scanning display includes the following steps: (A) Generate an initial synchronization control signal and a serial input signal having an image stream and multiple predetermined delay values, the initial synchronization control signal being related to an image update of the screen displayed on the scanning display; (B) Based on the original synchronization control signal and the predetermined delay value, a plurality of delayed internal synchronization control signals are generated, each internal synchronization control signal having a delay time with the original synchronization control signal, the delay time being related to a corresponding one of the predetermined delay values, each internal synchronization control signal and the original synchronization control signal having a square wave, and a time difference between the starting point of the square wave of each internal synchronization control signal and the starting point of the square wave of the original synchronization control signal being used as the delay time. (C) Based on the serial input signal and the internal synchronization control signal, generate a plurality of delayed backlight drive signal outputs, wherein the backlight delay time of each backlight drive signal output is related to the predetermined delay value corresponding to a counterpart of the internal synchronization control signal; and (D) The backlight driving signal output is transmitted to multiple backlight units of the backlight module respectively, so that when the scanning display updates the image data to display the screen, the light emission order of the backlight units changes with the change of the predetermined delay value.

2. The backlight driving method for a scanning display according to claim 1, characterized in that, There is a difference between adjacent values ​​in the predetermined delay value, and each difference is the same. When the image data is updated in the scanning display to display the screen, the backlight unit emits light line by line.

3. The backlight driving method for a scanning display according to claim 1, characterized in that, The predetermined delay values ​​have a difference between adjacent values, and each difference is of a different magnitude.

4. The backlight driving method for a scanning display according to claim 1, characterized in that, There is a difference between two adjacent predetermined delay values, and at least one of the differences is zero.

5. A backlight driving module for a scanning display, used to drive a backlight module comprising multiple backlight units, characterized in that, The backlight driving module includes: Multiple backlight driving units are electrically connected to the backlight units of the backlight module. Each backlight driving unit receives an original synchronization control signal and a serial input signal having an image stream and multiple predetermined delay values. Each backlight driving unit generates a delayed internal synchronization control signal according to a corresponding one of the predetermined delay values ​​and the original synchronization control signal, and generates a delayed backlight driving signal output according to the serial input signal and the internal synchronization control signal. The backlight driving signal output is transmitted to a corresponding one of the backlight units, so that when the scanning display updates image data to display the screen, the light emission order of the backlight units changes with the change of the predetermined delay values. The original synchronization control signal is related to the image update of the screen displayed by the scanning display. Each internal synchronization control signal has a delay time with the original synchronization control signal. The delay time is related to a corresponding one of the predetermined delay values. The backlight delay time output by each backlight drive signal is related to the predetermined delay value corresponding to a corresponding one of the internal synchronization control signals. The internal synchronization control signal and the original synchronization control signal each have a square wave, and the time difference between the starting point of the square wave of each internal synchronization control signal and the starting point of the square wave of the original synchronization control signal is used as the delay time.

6. The backlight driving module of the scanning display according to claim 5, characterized in that, Also includes: The control unit is electrically connected to the backlight driving unit, generates the original synchronization control signal and the serial input signal, and outputs the original synchronization control signal and the serial input signal to the backlight driving unit.

7. The backlight driving module of the scanning display according to claim 5, characterized in that, There is a difference between two adjacent predetermined delay values, and each difference is the same in magnitude. When the scanning display updates the image data to display the screen, the backlight unit emits light line by line.

8. The backlight driving module of the scanning display according to claim 5, characterized in that, The predetermined delay values ​​have a difference between adjacent values, and each difference is of a different magnitude.

9. The backlight driving module of the scanning display according to claim 5, characterized in that, There is a difference between two adjacent predetermined delay values, and at least one of the differences is zero.

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