Image display method and display system

Abstract

The invention provides a display system and method. The method comprises the following steps: generating a data clock pulse signal; generating and adjusting a backlight driving signal according to the data clock pulse signal; and the display system displays an image at least according to the data clock pulse signal and the backlight driving signal. Wherein the data clock pulse signal comprises a first data square wave, a first frame interval corresponding to the first data square wave sequentially comprises a first vertical blank interval, a data scanning interval and a second vertical blank interval, and the first data square wave is transmitted in the data scanning interval. The backlight driving signal sequentially comprises a first backlight square wave and a second backlight square wave, the starting end of the first backlight square wave corresponds to the starting end of the first vertical blank interval in an unadjustable manner, and the stopping end of the second backlight square wave corresponds to the stopping end of the second vertical blank interval in an unadjustable manner. By adjusting the opportunity of turning on or turning off the backlight driving signal, the time duration of backlight generation of the backlight module in the deflection process of each pixel liquid crystal is reduced, and the blurring of a dynamic picture is reduced.

Description

Technical Field

[0001] The present invention relates to a method and a display system for displaying an image, and in particular to a method and a display system for displaying an image with reduced motion blur. Background Art

[0002] Liquid Crystal Display (LCD) and Organic Light Emitting Diode (OLED) display devices have the advantages of thin and light appearance, power saving and no radiation, and are now widely used in electronic products such as multimedia players, mobile phones, personal digital assistants, computer monitors, or flat-screen TVs.

[0003] When displaying an image, a conventional liquid crystal display uses a pulse modulation signal to drive a pixel array to generate an image frame, and drives a backlight device to generate a backlight drive signal, and continuously turns on or off the backlight drive signal so that the image frame is illuminated for viewing by the user. However, a liquid crystal display is a hold type display device, that is, for each pixel, the pixel intensity value will remain constant until the next image frame is updated to a new intensity value. Specifically, the image frame is generated by deflecting the liquid crystal of each pixel to a corresponding angle, and turning on the backlight drive signal before the liquid crystal is stable will additionally generate an afterimage of the image. Therefore, due to the visual persistence mechanism of the human eye, users tend to feel motion blur when viewing the image, which reduces the visual quality.

[0004] Our company's prior patent application with application number CN201710635755.2 proposed turning off the backlight during the liquid crystal transition period, and turning on the backlight after the liquid crystal transition is stable, so that users can feel the enhanced dynamic clarity of continuous images. In addition, for the frame interval of the same frame image processing display, two backlight square waves are used to drive the backlight to avoid image flickering when the frequency of the backlight driving signal can be maintained greater than the frequency of the data clock signal. However, this prior patent application does not specify how to limit the position of the square wave on and off, and it is still very likely that the backlight will be turned on during the liquid crystal transition, and there will still be dynamic blur and image flickering. Summary of the invention

[0005] The purpose of the present invention is to improve the image dynamic blur and flickering when the display displays an image.

[0006] To achieve the above object, the present invention provides a method for displaying an image, comprising:

[0007] Generate a data clock signal, the data clock signal includes a first data square wave, the first frame interval corresponding to the first data square wave includes a first vertical blank interval, a data scanning interval and a second vertical blank interval in sequence, wherein the first data square wave is transmitted in the data scanning interval;

[0008] A backlight driving signal is generated according to the data clock signal; wherein the backlight driving signal includes a first backlight square wave and a second backlight square wave in sequence, and the backlight driving signal corresponds to the first frame interval, the starting end of the first backlight square wave is non-adjustably corresponding to the starting end of the first vertical blank interval, and the ending end of the second backlight square wave is non-adjustably corresponding to the ending end of the second vertical blank interval; and

[0009] The display system displays an image at least according to the data clock signal and the backlight driving signal.

[0010] Preferably, the sum of the area of ​​the first backlight square wave and the area of ​​the second backlight square wave corresponds to the image brightness of the first frame interval, and the height of the first backlight square wave is equal to the height of the second backlight square wave.

[0011] Preferably, the end point of the first backlight square wave and / or the start point of the second backlight square wave are adjusted according to the image brightness of the first frame interval.

[0012] Preferably, the data scanning interval is sequentially divided into a first data sub-interval, a second data sub-interval and a third data sub-interval.

[0013] Further preferably, the time length of the first data sub-interval and the time length of the third data sub-interval are respectively the time length of the data scanning interval / N, and the time length of the second data sub-interval is the time length of the data scanning interval*(N-2) / N, wherein N is an integer greater than 2.

[0014] More preferably, N=5.

[0015] Further preferably, when the first backlight square wave and the second backlight square wave have no overlapping area with the second data sub-interval, the area of ​​the first backlight square wave is equal to the area of ​​the second backlight square wave, so that the sum of the area of ​​the first backlight square wave and the area of ​​the second backlight square wave corresponds to the image brightness of the first frame interval.

[0016] Further preferably, when the end end of the first backlight square wave is later than the start end of the second data sub-interval, and the start end of the second backlight square wave is not earlier than the end end of the second data sub-interval, the end end of the first backlight square wave is adjusted to correspond to the start end of the second data sub-interval, and the start end of the second backlight square wave is adjusted so that the sum of the area of ​​the first backlight square wave and the area of ​​the second backlight square wave corresponds to the image brightness of the first frame interval.

[0017] Further preferably, when the end end of the first backlight square wave is no later than the start end of the second data sub-interval, and the start end of the second backlight square wave is earlier than the end end of the second data sub-interval, the start end of the second backlight square wave is adjusted to correspond to the end end of the second data sub-interval, and the end end of the first backlight square wave is adjusted so that the sum of the area of ​​the first backlight square wave and the area of ​​the second backlight square wave corresponds to the image brightness of the first frame interval.

[0018] Further preferably, when the end end of the first backlight square wave is later than the start end of the second data sub-interval, and the start end of the second backlight square wave is earlier than the end end of the second data sub-interval, the end end of the first backlight square wave and the start end of the second backlight square wave are adjusted so that the area of ​​the first backlight square wave overlapping the second data sub-interval is equal to the area of ​​the second backlight square wave overlapping the second data sub-interval.

[0019] To achieve the above object, the present invention provides a display system, comprising:

[0020] A processing device for generating a data clock signal and generating a backlight driving signal according to the data clock signal;

[0021] A pixel array for producing images;

[0022] An image driving device, coupled to the processing device and the pixel array, for controlling the pixel array according to the data clock signal;

[0023] A backlight module for emitting backlight; and

[0024] A backlight driving device, coupled to the processing device and the backlight module, for controlling the backlight module according to the backlight driving signal;

[0025] The data clock signal generated by the processing device includes a first data square wave, and the first frame interval corresponding to the first data square wave includes a first vertical blank interval, a data scanning interval and a second vertical blank interval in sequence, wherein the first data square wave is transmitted in the data scanning interval;

[0026] The backlight driving signal generated by the processing device corresponds to the first frame interval, and the backlight driving signal sequentially includes a first backlight square wave and a second backlight square wave, wherein the starting end of the first backlight square wave is non-adjustably corresponding to the starting end of the first vertical blank interval, and the ending end of the second backlight square wave is non-adjustably corresponding to the ending end of the second vertical blank interval;

[0027] The pixel array generates an image at least according to the data clock signal, and the backlight module emits backlight at least according to the backlight driving signal.

[0028] Preferably, the sum of the area of ​​the first backlight square wave and the area of ​​the second backlight square wave corresponds to the image brightness of the first frame interval, and the height of the first backlight square wave is equal to the height of the second backlight square wave.

[0029] Preferably, the processing device adjusts the end point of the first backlight square wave and / or the start point of the second backlight square wave according to the image brightness of the first frame interval.

[0030] Preferably, the data scanning interval is sequentially divided into a first data sub-interval, a second data sub-interval and a third data sub-interval.

[0031] Further preferably, the time length of the first data sub-interval and the time length of the third data sub-interval are respectively the time length of the data scanning interval / N, and the time length of the second data sub-interval is the time length of the data scanning interval*(N-2) / N, wherein N is an integer greater than 2.

[0032] More preferably, N=5.

[0033] Further preferably, when the first backlight square wave and the second backlight square wave have no overlapping area with the second data sub-interval, the area of ​​the first backlight square wave is equal to the area of ​​the second backlight square wave, so that the sum of the area of ​​the first backlight square wave and the area of ​​the second backlight square wave corresponds to the image brightness of the first frame interval.

[0034] Further preferably, when the end end of the first backlight square wave is later than the start end of the second data sub-interval, and the start end of the second backlight square wave is not earlier than the end end of the second data sub-interval, the end end of the first backlight square wave is adjusted to correspond to the start end of the second data sub-interval, and the start end of the second backlight square wave is adjusted so that the sum of the area of ​​the first backlight square wave and the area of ​​the second backlight square wave corresponds to the image brightness of the first frame interval.

[0035] Further preferably, when the end end of the first backlight square wave is no later than the start end of the second data sub-interval, and the start end of the second backlight square wave is earlier than the end end of the second data sub-interval, the start end of the second backlight square wave is adjusted to correspond to the end end of the second data sub-interval, and the end end of the first backlight square wave is adjusted so that the sum of the area of ​​the first backlight square wave and the area of ​​the second backlight square wave corresponds to the image brightness of the first frame interval.

[0036] Further preferably, when the end end of the first backlight square wave is later than the start end of the second data sub-interval, and the start end of the second backlight square wave is earlier than the end end of the second data sub-interval, the end end of the first backlight square wave and the start end of the second backlight square wave are adjusted so that the area of ​​the first backlight square wave overlapping the second data sub-interval is equal to the area of ​​the second backlight square wave overlapping the second data sub-interval.

[0037] Compared with the prior art, the display system and method provided by the present invention has a backlight driving signal which includes a first backlight square wave and a second backlight square wave in sequence, wherein the starting end of the first backlight square wave is unadjustably corresponding to the starting end of the first vertical blank interval, and the ending end of the second backlight square wave is unadjustably corresponding to the ending end of the second vertical blank interval. Based on this, the overlapping area between the interval where the backlight is lit and the data square wave can be minimized, or even completely eliminated, thereby further reducing flicker and motion blur and improving dynamic clarity. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a schematic diagram of the system structure of a display system in one embodiment of the present invention;

[0039] Figure 2 for Figure 1 A schematic diagram of a data clock signal and a backlight driving signal in a display system;

[0040] Figure 3 for Figure 1 A schematic diagram of a data clock signal and a backlight driving signal in a display system of the first embodiment;

[0041] Figure 4 for Figure 1 A schematic diagram of a data clock signal and a backlight driving signal in a second embodiment of a display system;

[0042] Figure 5 for Figure 1 A schematic diagram of a data clock signal and a backlight driving signal in a display system of a third embodiment;

[0043] Figure 6 for Figure 1 A flowchart of a method for displaying an image in a display system. DETAILED DESCRIPTION

[0044] In order to provide a further understanding of the purpose, structure, features, and functions of the present invention, the following detailed description is given in conjunction with the embodiments.

[0045] Certain words are used in the specification and claims to refer to specific components. Those with ordinary knowledge in the field should understand that manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but rather use differences in components' functions as the criteria for distinction. The term "including" mentioned throughout the specification and claims is an open-ended term and should be interpreted as "including but not limited to".

[0046] Figure 1 is a block diagram of an embodiment of a display system 1 of the present invention. The display system 1 includes a processing device 10, an image driving device 11, a pixel array 12, a backlight driving device 13 and a backlight module 14. The processing device 10 can be any form of computing element, such as a processing chip (Scalar IC), a central processing unit, a microprocessor, a programmable control unit, etc. The image driving device 11 is coupled to the processing device 10 and the pixel array 12, and is used to generate a voltage required to drive the pixel array 12. The backlight driving device 13 is coupled to the processing device 10 and the backlight module 14, and is used to generate a voltage required to drive the backlight module 14. The image driving device 11 can be any form of a scan line / data line driving device, or a driving device including a shift register. The image driving device 11 can use a row by row driving mode to drive the pixel array 12. The pixel array 12 can be any element having a color display function, such as a liquid crystal. The backlight driving device 13 can be any driving device that drives the backlight module 14 according to a pulse width modulation signal (PWM). The backlight module 14 can be any device with a light-emitting function. For example, the backlight module 14 can be at least one string of light-emitting diodes (LEDs). In the display system 1, the processing device 10 is used to generate a data clock signal and generate a backlight driving signal according to the data clock signal. The data clock signal can be a pulse modulation signal with a predetermined or customized frequency, such as 60 Hz. The image driving device 11 can adjust the polarity of the liquid crystal of the sub-pixel in the pixel array 12 according to the data clock signal and the image data input from the outside to generate an image. The backlight driving device 13 can control the backlight module 14 according to the backlight driving signal to generate the backlight driving signal. The method of displaying an image by the display system 1 will be described later.

[0047] See also Figure 2The data clock signal Frames generated by the processing device 10 is a periodic square wave signal, including a first data square wave Frame#1. The first data square wave Frame#1 is a square wave with a fixed time length. In other embodiments, the time length of the first data square wave Frame#1 may also be variable, and the present invention is not limited thereto. The first frame interval DP1 corresponding to the first data square wave Frame#1 includes a first vertical blank interval BLK1, a data scanning interval D, and a second vertical blank interval BLK2 in sequence, wherein the first data square wave Frame#1 is transmitted in the data scanning interval D. In other words, in the first vertical blank interval BLK1, each pixel maintains the image brightness corresponding to the previous data square wave; in the data scanning interval D, based on the transmission of the first data square wave Frame#1, the liquid crystal of each pixel in the pixel array 12 is deflected; in the second vertical blank interval BLK2, the liquid crystal of each pixel is deflected in place, and each pixel maintains the image brightness corresponding to the first data square wave Frame#1. The backlight generated by the backlight module 14 has backlight brightness. The brightness of the image viewed by the user refers to the average brightness of the image formed by the backlight illuminating the liquid crystals of each pixel in the pixel array 12 .

[0048] Specifically, the backlight driving signal BL generated by the processing device 10 according to the data clock signal Frames is a pulse modulation signal composed of a plurality of square wave signals, and the backlight driving signal BL corresponds to the first frame interval DP1. When the display system 1 displays the picture according to the first data square wave Frame#1, the liquid crystal of each pixel in the pixel array 12 is driven to deflect at the starting end TD1 of the data scanning interval D, and each pixel liquid crystal is deflected to the position at the ending end TD2 of the data scanning interval D. Therefore, during the deflection process of each pixel liquid crystal, the pixel array 12 changes from one stable picture to another stable picture. If the backlight module 14 is driven to illuminate each pixel liquid crystal in the deflection process, the user will see the afterimage of the picture refresh, resulting in blurred dynamic pictures. Therefore, in order to reduce the image blur, in the present embodiment, the backlight driving signal BL sequentially includes a first backlight square wave B1 and a second backlight square wave B2, the starting end TB11 of the first backlight square wave B1 is non-adjustably corresponding to the starting end TBLK11 of the first vertical blank interval BLK1, and the ending end TB22 of the second backlight square wave is non-adjustably corresponding to the ending end TBLK22 of the second vertical blank interval BLK2. In other words, the starting end TB11 of the first backlight square wave B1 is fixedly corresponding to the starting end T1 of the first frame interval DP1, and the ending end TB12 of the first backlight square wave B1 falls within the first vertical blank interval BLK1 or the data scanning interval D; the starting end TB21 of the second backlight square wave B2 falls within the data scanning interval D or the second vertical blank interval BLK2, and the ending end TB22 of the second backlight square wave B2 is fixedly corresponding to the ending end T2 of the first frame interval DP1. For example, the frequency of the data clock signal Frames is 60 Hz, and a vertical synchronization signal (Vertical Synchronization, V-Sync) is provided every 1 / 60 second. The image driving device 11 drives the liquid crystal of each pixel in the pixel array 12 to deflect according to the vertical synchronization signal, and the backlight driving device 13 drives the backlight module 14 to emit backlight according to the vertical synchronization signal. The present invention adjusts the timing of turning on or off the backlight driving signal BL in the first frame interval DP1, thereby reducing the length of time the backlight driving signal is turned on during the deflection of each pixel liquid crystal, reducing the recognition of blurred images by the visual persistence mechanism of the human eye, and allowing the user to watch clear dynamic images.

[0049] In a preferred embodiment, each light emitting element in the light emitting element array in the backlight module 14 is turned on at the starting end TB11 of the first backlight square wave B1 and the starting end TB21 of the second backlight square wave B2, and each light emitting element is turned off at the ending end TB12 of the first backlight square wave B1 and the ending end TB22 of the second backlight square wave B2. For example, all light emitting elements have the same delay time (e.g., turn-on delay, turn-off delay) for the vertical synchronization signal, so that all light emitting elements are turned on and emit light at the same rising edge of the same backlight driving signal BL, and are turned off at the same falling edge of the same backlight driving signal BL.

[0050] In a preferred embodiment, the sum of the area of ​​the first backlight square wave B1 and the area of ​​the second backlight square wave B2 corresponds to the image brightness L of the first frame interval DP1. It should be noted that the area of ​​the backlight square wave refers to the product of the height of the backlight square wave and the length of the backlight square wave, wherein the height of the backlight square wave represents the brightness of the backlight, and the length of the backlight square wave represents the length of time the backlight is lit. Preferably, the height of the first backlight square wave B1 and the height of the second backlight square wave B2 are equal, that is, the backlight brightness during the driving period of the first backlight square wave B1 is the same as the backlight brightness during the driving period of the second backlight square wave B2. For example, since the heights of the first backlight square wave B1 and the second backlight square wave B2 are equal, the heights of the two are set to the first value V1, the length of time the first backlight square wave B1 is driven is set to the second value V2, and the length of time the second backlight square wave B2 is driven is set to the third value V3, wherein the first value V1, the second value V2 and the third value V3 are positive numbers greater than zero. The area of ​​the first backlight square wave B1 (first value V1*second value V2) is the image brightness corresponding to the previous data square wave in the first frame interval DP1, and the area of ​​the second backlight square wave B2 (first value V1*third value V3) is the image brightness corresponding to the first data square wave Frame#1 in the first frame interval DP1. That is to say, in the first frame interval DP1, in addition to being able to see the image of the previous data square wave during the first backlight square wave B1 driving period, the image of the first data square wave Frame#1 can also be seen during the second backlight square wave B2 driving period. Due to the visual persistence mechanism of the human eye, the first value V1*(second value V2+third value V3) corresponds to the image brightness L of the first frame interval DP1.

[0051] In a preferred embodiment, according to the image brightness L setting, the sum of the area of ​​the first backlight square wave B1 and the area of ​​the second backlight square wave B2 is a fixed value, that is, the numerical value of the first value V1*(second value V2+third value V3) is fixed, which means that the image brightness L of the first frame interval DP1 is fixed. For example, the frequency of the data clock signal Frames is 240 Hz, and the time length of the first frame interval DP1 is (1 / 240) seconds. The high level time length ratio in the backlight drive signal BL is set to be fixed at 10%, and the time length of turning on the backlight drive signal is (1 / 2400) seconds, which means that the sum of the time lengths of the first backlight square wave B1 and the second backlight square wave B2 is fixed to (1 / 2400) seconds.

[0052] In a preferred embodiment, please refer to Figures 3 to 5 , the data scanning interval D is divided into the first data sub-interval D1, the second data sub-interval D2 and the third data sub-interval D3 in sequence. That is to say, the first frame interval DP1 is divided into the first part first frame interval DP11, the second part first frame interval DP12 and the third part first frame interval DP13 in sequence, the first part first frame interval DP11 includes the first vertical blank interval BLK1 and the first data sub-interval D1 in sequence, the second part first frame interval DP12 includes the second data sub-interval D2, and the third part first frame interval DP13 includes the third data sub-interval D3 and the second vertical blank interval BLK2 in sequence. It should be noted that in the first data sub-interval D1, the liquid crystal of each pixel that receives the data clock signal Frames and is about to change the picture has just begun to deflect, and the image brightness change caused by it is small. In the third data sub-interval D3, the liquid crystal in each pixel of the changing picture is close to the target position, and the change of its image brightness relative to the target is also small. Therefore, even if the end end TB12 of the first backlight square wave B1 falls within the first data sub-interval D1 and / or the start end TB21 of the second backlight square wave B2 falls within the third data sub-interval D3, pixel motion blur will not be caused.

[0053] Preferably, the time length of the first data sub-interval D1 and the time length of the third data sub-interval D3 are respectively the time length of the data scanning interval D / N, and the time length of the second data sub-interval D2 is the time length of the data scanning interval D*(N-2) / N, wherein N is an integer greater than 2. Taking N=5 as an example, the frequency of the data clock signal Frames is 240 Hz, and the time length of the first frame interval DP1 is (1 / 240) seconds. The time length of the first vertical blank interval BLK1 is set to (1 / 3600) seconds, and the time length of the second vertical blank interval BLK2 is set to (1 / 5400) seconds, then the time length of the data scanning interval D is (1 / 270) seconds, at which time the time lengths of the first data sub-interval D1 and the third data sub-interval D3 are both (1 / 1350) seconds, and the time length of the second data sub-interval D2 is (1 / 810) seconds. In this embodiment, the time length of the first part first frame interval DP11 is (1 / 3600+1 / 1350) seconds, the time length of the second part first frame interval DP12 is (1 / 810) seconds, and the time length of the third part first frame interval DP13 is (1 / 1350+1 / 5400) seconds. It should be noted that the value of N can be changed accordingly according to the frequency of the data clock signal Frames, and the present invention is not limited thereto.

[0054] In this embodiment, the processing device 10 adjusts the end terminal TB12 of the first backlight square wave B1 and / or adjusts the start terminal TB21 of the second backlight square wave B2 according to the target image brightness L of the first frame interval DP1 until the image brightness reaches the target image brightness L. In other words, the first value V1*the second value V2 described above corresponds to the first image brightness L1 of the previous data square wave in the first frame interval DP1, and the first value V1*the second value V3 corresponds to the second image brightness L2 of the first data square wave Frame#1 in the first frame interval DP1. When the first value V1, the start terminal TB11 of the first backlight square wave B1, and the end terminal TB22 of the second backlight square wave B2 are kept unchanged, the image brightness can be adjusted to the target image brightness L by adjusting the second value V2 and / or the third value V3.

[0055] It should be noted that when the image brightness reaches the target image brightness L, the end TB12 of the first backlight square wave B1 may fall within the first data sub-interval D1, or even within the second data sub-interval D2; the start end TB21 of the second backlight square wave B2 may fall within the third data sub-interval D3, or even within the second data sub-interval D2. As described above, when the backlight square wave falls within the first data sub-interval D1 and the third data sub-interval D3, pixel dynamic blur will not be caused, so the processing device 10 does not need to adjust the timing of turning on or off the backlight driving signal BL; but when the backlight square wave may fall within the second data sub-interval D2, how to keep the image brightness L unchanged and reduce the dynamic blur of the picture will be described in the following three embodiments.

[0056] In the first embodiment, see Figure 3, when the image brightness of the first frame interval DP1 reaches the target image brightness L, the end terminal TB12 of the first backlight square wave B1 is not later than the start terminal TD21 of the second data sub-interval D2, and the start terminal TB21 of the second backlight square wave B2 is not earlier than the end terminal TD22 of the second data sub-interval D2, in order to keep the target image brightness L unchanged, the processing device 10 no longer adjusts the end terminal TB12 of the first backlight square wave B1 and the start terminal TB21 of the second backlight square wave B2. In other words, if the area of ​​the overlap between the first backlight square wave B1 and the second backlight square wave B2 and the second data sub-interval D2 is 0, and the image brightness of the first frame interval DP1 has reached the target image brightness L, it is considered that the effect of reducing the motion blur of the picture is ideal, so the processing device 10 does not need to adjust the timing of turning on or off the backlight driving signal BL. For example, N=5, the frequency of the data clock signal Frames is 240 Hz, and the time length of the first frame interval DP1 is (1 / 240) seconds. Set the time length of the first vertical blank interval BLK1 to (1 / 3600) seconds and the time length of the second vertical blank interval BLK2 to (1 / 5400) seconds, then the time length of the data scanning interval D is (1 / 270) seconds. At this time, the time lengths of the first data sub-interval D1 and the third data sub-interval D3 are both (1 / 1350) seconds, and the time length of the second data sub-interval D2 is (1 / 810) seconds. Therefore, the time length of the first part first frame interval DP11 is (1 / 3600+1 / 1350) seconds, the time length of the third part first frame interval DP13 is (1 / 1350+1 / 5400) seconds, and when the image brightness of the first frame interval DP1 reaches the target image brightness L, the time length of the first backlight square wave B1 is (1 / 3600+1 / 1350) seconds, which is equal to the time length of the first part first frame interval DP11, that is, the end end TB12 of the first backlight square wave B1 is exactly at the start end TD2 of the second data sub-interval D2. 1; and the time length of the second backlight square wave B2 is (1 / 1350+1 / 5400) seconds, which is equal to the time length of the third part first frame interval DP13, that is, the starting end TB21 of the second backlight square wave B2 just overlaps with the ending end TD22 of the second data sub-interval D2, that is to say, the overlapping areas of the first backlight square wave B1 and the second backlight square wave B2 and the second data sub-interval D2 are both 0. Therefore, the processing device 10 no longer adjusts the ending end TB12 of the first backlight square wave B1 and the starting end TB21 of the second backlight square wave B2.

[0057] In the second embodiment, in the first case, when the image brightness of the first frame interval DP1 reaches the target image brightness L, the end end TB12 of the first backlight square wave B1 is later than the start end TD21 of the second data sub-interval D2, and the start end TB21 of the second backlight square wave B2 is not earlier than the end end TD22 of the second data sub-interval D2, the processing device 10 adjusts the end end TB12 of the first backlight square wave B1 to overlap with the start end TD21 of the second data sub-interval D2, and adjusts the start end TB21 of the second backlight square wave B2, so that the sum of the area of ​​the first backlight square wave B1 and the area of ​​the second backlight square wave B2 remains unchanged (that is, the target image brightness L is kept unchanged), thereby reducing the motion blur of the picture. On the contrary, in the second case, when the image brightness of the first frame interval DP1 reaches the target image brightness L, the end TB12 of the first backlight square wave B1 is no later than the start end TD21 of the second data sub-interval D2, and the start end TB21 of the second backlight square wave B2 is earlier than the end end TD22 of the second data sub-interval D2, the processing device 10 adjusts the start end TB21 of the second backlight square wave B2 to overlap with the end end of the second data sub-interval D2, and adjusts the end end of the first backlight square wave B1, so that the sum of the area of ​​the first backlight square wave B1 and the area of ​​the second backlight square wave B2 remains unchanged (i.e., the target image brightness L remains unchanged), thereby reducing the motion blur of the picture. Please refer to Figure 4, taking the second case as an example, N=5, the frequency of the data clock signal Frames is 240 Hz, and the time length of the first frame interval DP1 is (1 / 240) seconds. The time length of the first vertical blank interval BLK1 is set to (1 / 3600) seconds, and the time length of the second vertical blank interval BLK2 is set to (1 / 5400) seconds, then the time length of the data scanning interval D is (1 / 270) seconds, at this time, the time lengths of the first sub-data interval D1 and the third sub-data interval D3 are both (1 / 1350) seconds, and the time length of the second sub-data interval D2 is (1 / 810) seconds. Therefore, the time length of the first part first frame interval DP11 is (1 / 3600+1 / 1350) seconds, and the time length of the third part first frame interval DP13 is (1 / 1350+1 / 5400) seconds. If the image brightness of the first frame interval DP1 reaches the target image brightness L, the time length of the original second backlight square wave B2 is (1 / 1350+1 / 5400+1 / 50000) seconds, which is 20 microseconds longer than the time length of the third part first frame interval DP13; and the time length of the original first backlight square wave B1 is (1 / 3600+1 / 1350-1 / 10000) seconds, which is shorter than the time length of the first part first frame interval DP11, the processing device 10 adjusts the time length of the original second backlight square wave B2 (1 / 50000) seconds to the time length of the original first backlight square wave B1, forming a new time length of the first backlight square wave B1: (1 / 3600+1 / 1350-1 / 12500) seconds and a new time length of the second backlight square wave B2: (1 / 1350+1 / 5400) seconds. At this time, the sum of the time lengths of the first backlight square wave B1 and the second backlight square wave B2 before and after the adjustment remains unchanged, that is, the image brightness before and after the adjustment keeps the image brightness of the first frame interval DP1 as the target image brightness L unchanged, but the area of ​​the overlap between the second backlight square wave B2 and the second sub-data interval D2 can be reduced after adjustment, and the area of ​​the overlap between the first backlight square wave B1 and the second sub-data interval D2 is not increased, so as to reduce the dynamic blur of the picture. This example is specifically cited to facilitate the understanding of the second embodiment, and the present invention is not limited to this.

[0058] In the third embodiment, when the image brightness of the first frame interval DP1 reaches the target image brightness L, the end end TB12 of the first backlight square wave B1 is later than the start end TD21 of the second data sub-interval D2, and the start end TB21 of the second backlight square wave B2 is earlier than the end end TD22 of the second data sub-interval D2, the processing device 10 adjusts the end end TB12 of the first backlight square wave B1 and the start end TB21 of the second backlight square wave B2, so that the area of ​​the first backlight square wave B1 overlapping the second data sub-interval D2 is equal to the area of ​​the second backlight square wave B2 overlapping the second data sub-interval D2, and the sum of the area of ​​the first backlight square wave B1 and the area of ​​the second backlight square wave B2 remains unchanged, thereby reducing the motion blur of the picture while maintaining the target image brightness L in the first frame interval DP1. Please refer to Figure 5, take the example that the area of ​​the second backlight square wave B2 overlapping the second data sub-interval D2 is larger, N=5, the frequency of the data clock signal Frames is 240 Hz, and the time length of the first frame interval DP1 is (1 / 240) seconds. Set the time length of the first vertical blank interval BLK1 to (1 / 3600) seconds, and the time length of the second vertical blank interval BLK2 to (1 / 5400) seconds, then the time length of the data scanning interval D is (1 / 270) seconds, at this time, the time lengths of the first sub-data interval D1 and the third sub-data interval D3 are both (1 / 1350) seconds, and the time length of the second sub-data interval D2 is (1 / 810) seconds. Therefore, the time length of the first part first frame interval DP11 is (1 / 3600+1 / 1350) seconds, and the time length of the third part first frame interval DP13 is (1 / 1350+1 / 5400) seconds. If the image brightness of the first frame interval DP1 reaches the target image brightness L, the time length of the original first backlight square wave B1 is (1 / 3600+1 / 1350+1 / 20000) seconds, which is (1 / 20000) seconds longer than the time length of the first part first frame interval DP11; and the time length of the original second backlight square wave B2 is (1 / 1350+1 / 5400+1 / 10000) seconds, which is (1 / 10000) seconds longer than the time length of the third part first frame interval DP13, the processing device 10 converts the (1 / 20000) seconds of the original first backlight square wave B1 and the (1 / 20000) seconds of the original second backlight square wave B2 into a single second. The (1 / 10000) second time length of the two backlight square waves B2 is averaged and adjusted to form a new time length of the first backlight square wave B1: (1 / 3600+1 / 1350+3 / 40000) second and a new time length of the second backlight square wave B2: (1 / 1350+1 / 5400+3 / 40000) second. Since the heights of the first backlight square wave B1 and the second backlight square wave B2 are equal to the first value V1, the area of ​​the first backlight square wave B1 overlapping the second data sub-interval D2 is equal to the area of ​​the second backlight square wave B2 overlapping the second data sub-interval D2. At this time, the sum of the time lengths of the first backlight square wave B1 and the second backlight square wave B2 before and after adjustment remains unchanged, that is, the image brightness before and after adjustment keeps the image brightness of the first frame interval DP1 as the target image brightness L unchanged, but the area of ​​the overlap between the first backlight square wave B1 and the second backlight square wave B2 and the second data sub-interval D2 is adjusted to be equal to reduce the dynamic blur of the picture. It should be noted that although the first backlight square wave B1 and the second backlight square wave B2 both have overlapping areas with the second data sub-interval D2, which may cause slight dynamic picture blur, this is the optimal solution to reduce the dynamic blur of the picture when the target image brightness L is reached. This example is specifically cited to facilitate the understanding of the third embodiment, and the present invention is not limited to this.

[0059] In a preferred embodiment, when the image brightness L of the first frame interval DP1 is relatively small, the first backlight square wave B1 and the second backlight square wave B2 have no overlapping area with the second data sub-interval D2. At this time, the area of ​​the first backlight square wave B1 and the area of ​​the second backlight square wave B2 are designed to be equal, and the sum of the area of ​​the first backlight square wave B1 and the area of ​​the second backlight square wave B2 corresponds to the image brightness of the first frame interval. In other words, when the image brightness L of the first frame interval DP1 is relatively small, the backlight square wave will not overlap with the second data sub-interval D2. At this time, the area of ​​the first backlight square wave B1 and the area of ​​the second backlight square wave B2 remain equal.

[0060] When the image brightness L of the first frame interval DP1 is relatively large, especially when the time lengths of the first part first frame interval DP11 and the third part first frame interval DP13 are not equal, at least one of the first backlight square wave B1 and the second backlight square wave B2 will overlap with the second data sub-interval D2. At this time, when the time length of the first part first frame interval DP11 is relatively short, the end end TB12 of the first backlight square wave B1 will first overlap with the start end TD21 of the second data sub-interval D2. When the time length of the third part first frame interval DP13 is relatively short, the start end TB21 of the second backlight square wave B2 will first overlap with the end end TD21 of the second data sub-interval D2. In order to facilitate understanding of the solution of this embodiment, the minimum image brightness L in the first frame interval DP1 that can satisfy any of the above two situations is called the first brightness L′, that is, when the image brightness L of the first frame interval DP1 is less than or equal to the first brightness L′, the area of ​​the first backlight square wave B1 is equal to the area of ​​the second backlight square wave B2. In the present embodiment, when the image brightness L of the first frame interval DP1 is less than the first brightness L′, the backlight square wave will not overlap with the second data sub-interval D2, and thus will not cause pixel motion blur; when the image brightness L of the first frame interval DP1 is greater than or equal to the first brightness L′, the backlight square wave may overlap with the second data sub-interval D2. At this time, the timing of turning on or off the backlight driving signal BL needs to be adjusted. The specific adjustment method has been described in detail in the previous text and will not be repeated here.

[0061] The image brightness L mentioned above can be a preset screen brightness set by the user. For example, the user can use the visual control adjustment function (e.g., On Screen Display, OSD) of the display system 1 to adjust the screen brightness to be displayed, or the user can also use the remote control to directly set the preset screen brightness. The image brightness L can also be the screen brightness automatically adjusted by the system or the preset screen brightness. For example, when the display has the function of automatically adjusting the image brightness L according to the external ambient light, the image brightness L can be automatically adjusted by the display. Any method of setting the image brightness L falls within the scope disclosed by the present invention.

[0062] See also Figure 6 The method for displaying an image includes steps S11 to S15. Any reasonable step changes fall within the scope disclosed by the present invention. Steps S11 to S15 are described as follows:

[0063] Step S11: The data clock signal Frames generated by the processing device 10 includes a first data square wave Frame#1 in a first frame interval DP1, wherein the first frame interval DP1 sequentially includes a first vertical blank interval BLK1, a data scanning interval D and a second vertical blank interval BLK2;

[0064] Step S12: the processing device 10 generates a first backlight square wave B1 and a second backlight square wave B2 according to the first data square wave, and the backlight driving device 13 drives the backlight module 14 according to the first backlight square wave B1 and the second backlight square wave B2 to emit backlight;

[0065] Step S13: the processing device 10 sets the starting end TB11 of the first backlight square wave B1 to correspond to the starting end TBLK11 of the first vertical blank interval in an unadjustable manner, and sets the ending end TB22 of the second backlight square wave B2 to correspond to the ending end TBLK22 of the second vertical blank interval in an unadjustable manner;

[0066] Step S14: the processing device 10 adjusts the end end TB12 of the first backlight square wave and / or the start end TB21 of the second backlight square wave according to the image brightness L of the first frame interval DP1, so that the backlight is turned on when the liquid crystal of each pixel in the pixel array 12 just starts to deflect and / or deflects close to the target position;

[0067] Step S15 : the pixel array 12 in the display system 1 generates an image according to the data clock signal Frames. The backlight module 14 in the display system 1 emits backlight according to the backlight driving signal BL. The image displayed by the display system 1 is at least generated by the backlight passing through the pixel array 12 .

[0068] The image is displayed based on the above steps, so that the image brightness L changes slightly, and thus does not cause pixel motion blur.

[0069] In summary, the display system and method provided by the present invention generate a data clock signal, and generate and adjust a backlight drive signal based on the data clock signal. The data clock signal includes a first data square wave, and the first frame interval corresponding to the first data square wave includes a first vertical blank interval, a data scanning interval, and a second vertical blank interval in sequence, wherein the first data square wave is transmitted in the data scanning interval. The backlight drive signal includes a first backlight square wave and a second backlight square wave in sequence, and the starting end of the first backlight square wave corresponds to the starting end of the first vertical blank interval, and the ending end of the second backlight square wave corresponds to the ending end of the second vertical blank interval. The timing of turning on or off the backlight drive signal is adjusted according to the frequency of the data clock signal, so as to reduce the length of time that the backlight module generates backlight during the deflection process of each pixel liquid crystal, reduce the user's recognition of blurred images due to the visual persistence mechanism of the human eye, and make the dynamic images viewed by the user clear.

[0070] The present invention has been described by the above-mentioned relevant embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention are all within the scope of patent protection of the present invention.

Claims

1. A method for displaying an image, characterized in that: Include: Generate a data clock signal, the data clock signal includes a first data square wave, the first frame interval corresponding to the first data square wave includes a first vertical blank interval, a data scanning interval and a second vertical blank interval in sequence, wherein the first data square wave is transmitted in the data scanning interval; A backlight driving signal is generated according to the data clock signal; wherein the backlight driving signal includes a first backlight square wave and a second backlight square wave in sequence, and the backlight driving signal corresponds to the first frame interval, the starting end of the first backlight square wave is non-adjustably corresponding to the starting end of the first vertical blank interval, and the ending end of the second backlight square wave is non-adjustably corresponding to the ending end of the second vertical blank interval; and The display system displays an image at least according to the data clock signal and the backlight driving signal.

2. The method for displaying an image according to claim 1, wherein: According to the image brightness of the first frame interval, the end point of the first backlight square wave and / or the start point of the second backlight square wave are adjusted.

3. The method for displaying an image according to claim 1, wherein: The data scanning interval is sequentially divided into a first data sub-interval, a second data sub-interval and a third data sub-interval.

4. The method for displaying an image according to claim 3, wherein: The time length of the first data sub-interval and the time length of the third data sub-interval are respectively the time length of the data scanning interval / N, and the time length of the second data sub-interval is the time length of the data scanning interval*(N-2) / N, where N is an integer greater than 2.

5. The method for displaying an image according to claim 3, wherein: When the first backlight square wave and the second backlight square wave have no overlapping area with the second data sub-interval, the area of ​​the first backlight square wave is equal to the area of ​​the second backlight square wave, so that the sum of the area of ​​the first backlight square wave and the area of ​​the second backlight square wave corresponds to the image brightness of the first frame interval.

6. The method for displaying an image as claimed in claim 3, wherein: When the end of the first backlight square wave is later than the start of the second data sub-interval, and the start of the second backlight square wave is not earlier than the end of the second data sub-interval, the end of the first backlight square wave is adjusted to correspond to the start of the second data sub-interval, and the start of the second backlight square wave is adjusted so that the sum of the area of ​​the first backlight square wave and the area of ​​the second backlight square wave corresponds to the image brightness of the first frame interval.

7. The method for displaying an image according to claim 3, wherein: When the end end of the first backlight square wave is no later than the start end of the second data sub-interval, and the start end of the second backlight square wave is earlier than the end end of the second data sub-interval, the start end of the second backlight square wave is adjusted to correspond to the end end of the second data sub-interval, and the end end of the first backlight square wave is adjusted so that the sum of the area of ​​the first backlight square wave and the area of ​​the second backlight square wave corresponds to the image brightness of the first frame interval.

8. The method for displaying an image as claimed in claim 3, wherein: When the end end of the first backlight square wave is later than the start end of the second data sub-interval, and the start end of the second backlight square wave is earlier than the end end of the second data sub-interval, the end end of the first backlight square wave and the start end of the second backlight square wave are adjusted so that the area of ​​the first backlight square wave overlapping the second data sub-interval is equal to the area of ​​the second backlight square wave overlapping the second data sub-interval.

9. A display system, characterized in that: Include: A processing device for generating a data clock signal and generating a backlight driving signal according to the data clock signal; A pixel array for producing images; An image driving device, coupled to the processing device and the pixel array, for controlling the pixel array according to the data clock signal; A backlight module, used to emit backlight; and A backlight driving device, coupled to the processing device and the backlight module, for controlling the backlight module according to the backlight driving signal; The data clock signal generated by the processing device includes a first data square wave, and the first frame interval corresponding to the first data square wave includes a first vertical blank interval, a data scanning interval and a second vertical blank interval in sequence, wherein the first data square wave is transmitted in the data scanning interval; The backlight driving signal generated by the processing device corresponds to the first frame interval, and the backlight driving signal sequentially includes a first backlight square wave and a second backlight square wave, wherein the starting end of the first backlight square wave is non-adjustably corresponding to the starting end of the first vertical blank interval, and the ending end of the second backlight square wave is non-adjustably corresponding to the ending end of the second vertical blank interval; The pixel array generates an image at least according to the data clock signal, and the backlight module emits backlight at least according to the backlight driving signal.

10. The display system according to claim 9, characterized in that: The processing device adjusts the end end of the first backlight square wave and / or the start end of the second backlight square wave according to the image brightness of the first frame interval.

Images