TW201832219A - Display System and Method for Displaying an Image - Google Patents

Abstract

A method for displaying an image includes acquiring a data clock signal and a vertical synchronization signal, generating a backlight driving signal according to the vertical synchronization signal, displaying the image by using the display device according to the data clock signal, the vertical synchronization signal, and the backlight driving signal. The backlight driving signal includes a composite wave synthesized by at least one pulse width modulation signal.

Description

Display system and method of displaying images

The present invention describes a display system and a method of displaying an image, and more particularly, a method of eliminating a dynamic blurred display image.

Liquid crystal display (LCD) and organic light emitting diode (OLED) display devices have been widely used in multimedia players due to their advantages of thinness, power saving and no radiation. , mobile phones, personal digital assistants, computer monitors, or flat-panel TVs and other electronic products.

Conventional displays use a pulse width modulation signal to drive the backlight when displaying an image. The backlight is continuously turned on or off, so that the user can easily feel the flickering of the screen while viewing the screen and reduce the visual quality. Especially in the case of high frequency requirements or high-speed dynamic images, it is easy to cause Motion Blur and reduce the picture quality. Moreover, due to the time when the backlight is turned on, the user may see a transient phenomenon of the image update, and therefore, it is easy for the user to see the flickering phenomenon of the screen. Moreover, even if the user does not notice that the picture flickers under the high-speed screen flicker, the user's eyes may be fatigued or even visually injured after watching for a while.

An embodiment of the present invention provides a method for displaying an image, comprising: acquiring a clock signal of a data, obtaining a vertical synchronization signal, generating a backlight driving signal according to the vertical synchronization signal, and displaying the system according to the data clock signal, the vertical synchronization signal, and the backlight driving signal. image. The data clock signal includes a first square wave, and the vertical synchronization signal includes a second square wave, and the first time interval corresponding to the first square wave has no intersection with the second time interval corresponding to the second square wave. The backlight driving signal includes a composite wave, which is synthesized by a third-party wave and at least one glitch.

Another embodiment of the present invention provides a display system including a backlight driving device and a backlight module. The backlight driving device is configured to generate a switch control signal and a current control signal according to the divided current signal, the backlight driving signal and the maximum current setting signal. The backlight module is coupled to the backlight driving device for driving at least one string of LED strings according to the switch control signal and the current control signal. The backlight driving device includes a driving circuit. The driving circuit receives the divided current signal through a voltage dividing circuit composed of a plurality of resistors, receives the backlight driving signal through the resistor and capacitor circuit, and receives the maximum current setting signal through the resistor, and the backlight driving signal includes at least one A composite wave composed of pulse-wave modulation signals.

1 is a block diagram of an embodiment of a display system 100 of the present invention. The display system 100 includes a processing device 10, a video driving device 11, a pixel array 12, a backlight driving device 13, and a backlight module 14. Processing device 10 can be any form of computing component, such as a processing chip (Scalar), a central processing unit, a microprocessor, a programmable control unit, and the like. The image driving device 11 is coupled to the processing device 10 for generating a voltage required to drive the pixel array 12. The backlight driving device 13 is coupled to the processing device 10 for generating a voltage required to drive the backlight module 14. The image driving device 11 can be any type of scanning line/data line driving device or a driving device including a shift register. The image driving device 11 can drive the pixel array 12 using a column drive mode (Row by Row). The pixel array 12 can be any component having a display color function. The backlight driving device 13 can be any driving device that drives the backlight module 14 according to at least one Pulse Width Modulation (PWM). The backlight module 14 can be any device having a light emitting function. For example, the backlight module 14 can be at least one string of Light-Emitting Diodes (LEDs). When the display system 100 is displaying an image, the processing device 10 can generate a data clock signal, a vertical synchronization signal, and a backlight driving signal. The data clock signal includes at least one first square wave, and the processing device 10 can control the image driving device 11 to generate a driving voltage in the first time interval corresponding to the first square wave to drive each column of pixels in the pixel array 12. (pixel corresponding to the scan line). The vertical synchronization signal includes at least one second square wave, and the first time interval corresponding to the first square wave of the data clock signal has no intersection with the second time interval corresponding to the second square wave of the vertical synchronization signal. In other words, the position of the second square wave of the vertical sync signal is in the middle of two consecutive first square waves of the data clock signal. The backlight driving signal includes at least one composite wave, and the composite wave is synthesized by a third-party wave and at least one surge. The display system 100 can display images according to the data clock signal, the vertical sync signal, and the backlight driving signal.

In the display system 100, the relative positions of the data clock signal, the vertical sync signal, and the backlight driving signal are appropriately designed to alleviate the image distortion caused by dynamic blur in the conventional display system, which is described below. In the conventional display system (in order to distinguish the display system 100, the components of the conventional display system described later are not represented by codes), the mode in which the backlight module is turned on can be always on, or the period of opening is very large. . In other words, in the conventional display system, the backlight module will remain on during the first time interval corresponding to the first square wave of the data clock signal. At this time, as described above, the processing device controls the image driving device to generate a driving voltage to drive each column of pixels in the pixel array in the first time interval corresponding to the first square wave. Therefore, the polarity of the pixels (such as the polarity of the liquid crystal pixels) is not steady state in the first time interval. However, since the backlight module of the conventional display system is kept on, the human eye will see the process in which the polarity of each column of pixels is updated in the pixel array. Therefore, in the conventional display system, when the frequency requirement of the frame is high or when the image has a high-speed moving image, the phenomenon of image sticking occurs. That is to say, the conventional display system may cause image distortion caused by dynamic blur. In the display system 100 of the present invention, the first time interval corresponding to the first square wave of the data clock signal generated by the processing device 10 does not intersect with the second time interval corresponding to the second square wave of the vertical synchronization signal. In other words, when the backlight drive signal coincides with the vertical sync signal, although the polarity of the pixel is not steady in the first time interval, it remains stable after the first time interval. The backlight driving signal and the vertical synchronization signal are turned on after the first time interval. Therefore, in the pixel array 12 visible to the human eye, the process in which the polarity of each column of pixels is updated is not seen. Therefore, even when the frequency requirement of the image frame is high, the display system 100 can effectively alleviate the image distortion problem caused by the motion blur. However, compared with the backlight module that is continuously turned on in the conventional display system, the duty cycle of the backlight module 14 of the display system 100 is small, so that the display brightness is dark. In order to alleviate the dynamic blur, the problem of display brightness is also overcome. The backlight driving signal of the present invention can be appropriately designed to enhance display brightness. For a more detailed description, the hardware architecture of the backlight driving device 13 and the backlight module 14 in the display system 100, and how the backlight driving signal will be designed to improve the display brightness will be described below.

FIG. 2 is a circuit diagram of the backlight driving device 13 and the backlight module 14 in the display system 100. The backlight driving device 13 includes a driving circuit 17 for generating a switch control signal and a current control signal according to the divided current signal, the backlight driving signal and the maximum current setting signal. The definition of each signal is as follows. The divided current signal is a signal received by the divided current signal pin ADIM of the driving circuit 17 for setting the current flowing through the LED string in the backlight module 14. The divided current signal pin ADIM of the driving circuit 17 can receive the divided current signal through the voltage dividing circuit 15. The voltage dividing circuit 15 can be composed of resistors R1 and R2. However, the hardware of the voltage dividing circuit 15 can also be reasonably converted into other circuits having a voltage dividing function. The backlight driving signal is a signal received by the backlight driving signal pin PWMP of the driving circuit 17 for setting the duty cycle of the backlight module 14 and the driving voltage. The backlight driving signal pin PWMP of the driving circuit 17 can receive the backlight driving signal through the RC-Circuit 16. The resistor-capacitor circuit 16 can be a resistor-capacitor circuit 16 composed of a resistor R3 and a capacitor C in parallel, and has a function of preventing chopping and voltage stabilization. The maximum current setting signal is a signal received by the maximum current setting signal pin Iset of the driving circuit 17, and is used to set the maximum current of the LED string (including the LEDs D1 to DM) in the backlight module 14. Current. The maximum current setting signal pin Iset of the driving circuit 17 can receive the maximum current setting signal through the resistor R4. After the divided current signal pin ADIM of the driving circuit 17 receives the divided current signal, the backlight driving signal pin PWMP receives the backlight driving signal, and the maximum current setting signal pin Iset receives the maximum current setting signal, the switch of the driving circuit 17 The control signal pin Comp can generate a switch control signal, and the switch SW in the backlight module 14 is controlled through the resistor R5. Moreover, the current control signal pin Isen of the driving circuit 17 can also generate a current control signal to control the ground voltage of the LED string (including the LEDs D1 to DM) in the backlight module 14. In other words, since the voltage difference between the ground voltage and the high voltage VCC of the LED string (including the LEDs D1 to DM) can be controlled by the potential of the current control signal, it is equivalent to controlling the flow through the backlight module. The current of the LED string within 14. In the display system 100, the light emitting diode strings may be composed of the light emitting diodes D1 to DM in series, and M is a positive integer greater than one. However, the backlight module 14 of the present invention does not limit the use of a single string of light-emitting diodes D1 to DM, and a plurality of strings of light-emitting diodes are also within the scope of the present invention. As described above, in order to simultaneously alleviate the problem of dynamic blurring and display brightness dimming, the backlight driving signal of the present invention can be appropriately designed to enhance display brightness. The detailed principles and various embodiments are described below.

FIG. 3 is a first waveform diagram of the data clock signal, the vertical sync signal, and the backlight driving signal in the display system 100. As described above, the first square wave of the data clock signal (clearly defined as the first square wave corresponding to the image area F1 is DT1, and the first square wave corresponding to the image area F2 is DT2) corresponds to the first time interval and The second time interval corresponding to the second square wave VT2 of the vertical synchronization signal has no intersection. In other words, the second square wave VT2 of the vertical sync signal is enabled between the first square wave DT1 and the first square wave DT2. In FIG. 3, the backlight driving signal includes a composite wave CW3 composed of a third-party wave BT3 and at least one surge RP. The time corresponding to the rising edge portion of the third-party wave BT3 is equal to the time corresponding to the rising edge portion of the second square wave VT2, and the time corresponding to the falling edge portion of the third-party wave BT3 is equal to the time corresponding to the falling-edge portion of the second square wave VT2. . Further, the number, position, and amplitude of the surge RP in the composite wave CW3 are not limited, and are within the scope of the present invention within a reasonable range of conversion. Moreover, the third-party wave BT3 of the backlight driving signal can be a pulse modulation signal, and the maximum duty cycle (Peak Duty Cycle) of the pulse modulation signal can be 1/20. As shown in FIG. 3, in the image area F1, the pixel polarity in the pixel array 12 is disturbed in the first time interval corresponding to the first square wave DT1 of the data clock signal. However, since the backlight module 14 is turned on in the corresponding third time interval of the composite wave CW3, and the third time interval is after the first time interval, the human eye visible area S1 is invisible to the user. The perturbation change of the pixel polarity in the pixel array 12. In other words, the picture seen by the human eye visible area S1 is a steady-state image after the pixel polarity in the pixel array 12 has been adjusted. Therefore, for the image of the human eye visible area S1, the image distortion problem caused by the dynamic blur can be alleviated or even eliminated. Moreover, since the backlight driving signal introduces a multi-composite composite wave CW3, which is equivalent to increasing the driving voltage of the backlight module 14 in a limited third time interval, it has the function of improving the average brightness displayed by the backlight module 14. The operation mode of the image area F2 afterwards is also similar to the image area F1, and thus will not be described herein. In addition, it can be understood that the time corresponding to the rising edge portion of the third-party wave BT3 and the time corresponding to the falling edge portion of the third-party wave BT3 may all be within the time segment of the second square wave VT2.

FIG. 4 is a second waveform diagram of the data clock signal, the vertical sync signal, and the backlight driving signal in the display system 100. Similarly, the first square wave of the data clock signal (clearly defined as the first square wave corresponding to the image area F1 is DT1, and the first square wave corresponding to the image area F2 is DT2) corresponds to the first time interval and The second time interval corresponding to the second square wave VT2 of the vertical synchronization signal has no intersection. In other words, the second square wave VT2 of the vertical sync signal is enabled between the first square wave DT1 and the first square wave DT2. In FIG. 4, the backlight driving signal includes a composite wave CW3 composed of a third-party wave BT3 and at least one surge RP. The difference from FIG. 3 is that the time corresponding to the falling edge portion of the composite wave CW3 is outside the second time interval corresponding to the second square wave VT2, and the time corresponding to the rising edge portion of the composite wave CW3 is in the second square wave VT2. Corresponding to the second time interval. As shown in FIG. 4, since the time corresponding to the falling edge portion of the composite wave CW3 is outside the second time interval corresponding to the second square wave VT2, the third time interval corresponding to the composite wave CW3 may be related to the data clock signal. The first time interval corresponding to the first square wave DT2 slightly overlaps. In other words, in addition to the image of the steady-state polar pixel array 12 in the first time interval corresponding to the first square wave DT1, the human eye visible area S1 may also see the time of the first square wave DT2. The pixel's polarity perturbation state (transient). However, in a general display, the upper and lower areas of the screen are not the focus areas. As described above, the image driving device 11 can drive the pixel array 12 using a column drive mode (Row by Row). Therefore, the pixel polarity perturbation state of the first square wave DT2 seen by the human eye visible area S1 is only the polarity perturbation state of the pixels in the upper area of the display. Therefore, for the image of the human eye visible area S1, the image distortion problem caused by the dynamic blur can also be alleviated. Moreover, since the backlight driving signal introduces a multi-composite composite wave CW3, which is equivalent to increasing the driving voltage of the backlight module 14 in a limited third time interval, it has the function of improving the average brightness displayed by the backlight module 14. The imaging principle of the visible area S0 of the human eye is also similar to the visible area S1 of the human eye, and thus will not be described herein. In addition, it can be understood that the time corresponding to the rising edge portion of the third-party wave BT3 may be within the time zone of the second square wave VT2.

FIG. 5 is a third waveform diagram of the data clock signal, the vertical sync signal, and the backlight driving signal in the display system 100. Similarly, the first square wave of the data clock signal (clearly defined as the first square wave corresponding to the image area F1 is DT1, and the first square wave corresponding to the image area F2 is DT2) corresponds to the first time interval and The second time interval corresponding to the second square wave VT2 of the vertical synchronization signal has no intersection. In other words, the second square wave VT2 of the vertical sync signal is enabled between the first square wave DT1 and the first square wave DT2. In FIG. 5, the backlight driving signal includes a composite wave CW3 composed of a third-party wave BT3 and at least one surge RP. The difference from FIG. 3 is that the time corresponding to the rising edge portion of the composite wave CW3 is outside the second time interval corresponding to the second square wave VT2, and the time corresponding to the falling edge portion of the composite wave CW3 is in the second square wave VT2. Corresponding to the second time interval. As shown in FIG. 5, since the time corresponding to the rising edge portion of the composite wave CW3 is outside the second time interval corresponding to the second square wave VT2, the third time interval corresponding to the composite wave CW3 may be related to the data clock signal. The first time interval corresponding to the first square wave DT1 slightly overlaps. In other words, the human eye visible area S1 may see the pixel polarity perturbation state (transient state) during the first square wave DT1. However, in a general display, the upper and lower areas of the screen are not the focus areas. As described above, the image driving device 11 can drive the pixel array 12 using a column drive mode (Row by Row). Therefore, the pixel polarity perturbation state of the first square wave DT2 seen by the human eye visible area S1 is only the polarity perturbation state of the pixels in the display area under the screen. Therefore, for the image of the human eye visible area S1, the image distortion problem caused by the dynamic blur can also be alleviated. Moreover, since the backlight driving signal introduces a multi-composite composite wave CW3, which is equivalent to increasing the driving voltage of the backlight module 14 in a limited third time interval, it has the function of improving the average brightness displayed by the backlight module 14. The imaging principle of the visible area S0 of the human eye is also similar to the visible area S1 of the human eye, and thus will not be described herein. In addition, it can be understood that the time corresponding to the falling edge portion of the third-party wave BT3 may be within the time zone of the second square wave VT2.

FIG. 6 is a fourth waveform diagram of the data clock signal, the vertical sync signal, and the backlight driving signal in the display system 100. Similarly, the first square wave of the data clock signal (clearly defined as the first square wave corresponding to the image area F1 is DT1, and the first square wave corresponding to the image area F2 is DT2) corresponds to the first time interval and The second time interval corresponding to the second square wave VT2 of the vertical synchronization signal has no intersection. In other words, the second square wave VT2 of the vertical sync signal is enabled between the first square wave DT1 and the first square wave DT2. In FIG. 5, the backlight driving signal includes a composite wave CW3 composed of a third-party wave BT3 and at least one surge RP. The difference from FIG. 3 is that the time corresponding to the rising edge portion of the composite wave CW3 is outside the second time interval corresponding to the second square wave VT2, and the time corresponding to the falling edge portion of the composite wave CW3 is also the second square wave. VT2 corresponds to the second time interval. In other words, the second time interval corresponding to the second square wave VT2 is in the third time zone corresponding to the composite wave CW3. As shown in FIG. 6, since the second time interval corresponding to the second square wave VT2 is in the third time zone corresponding to the composite wave CW3, the third time interval corresponding to the composite wave CW3 may be the same as the data clock signal. The time intervals corresponding to the square waves DT1 and DT2 slightly overlap. In other words, the human eye visible area S1 may see the pixel polarity perturbation state (transient state) during the first square waves DT1 and DT2. However, in a general display, the upper and lower areas of the screen are not the focus areas. As described above, the image driving device 11 can drive the pixel array 12 using a column drive mode (Row by Row). Therefore, the pixel polarity perturbation state of the first square wave DT2 and DT2 seen by the human eye visible area S1 is only the pixel of the corresponding first square wave DT2 and the upper area of the screen in the lower area of the display. Corresponding to the polarity perturbation state of the pixel of the second square wave DT2. For the image of the human eye visible area S1, the image distortion problem caused by the dynamic blur can also be alleviated. Moreover, since the backlight driving signal introduces a multi-composite composite wave CW3, which is equivalent to increasing the driving voltage of the backlight module 14 in a limited third time interval, it has the function of improving the average brightness displayed by the backlight module 14. The imaging principle of the visible area S0 of the human eye is also similar to the visible area S1 of the human eye, and thus will not be described herein.

FIG. 7A is a schematic diagram of the first pulse modulation signal PWM1 used in the display system 100 to synthesize the backlight driving signal. FIG. 7B is a schematic diagram of the second pulse modulation signal PWM2 used in the display system 100 to synthesize the backlight driving signal. FIG. 7C is a schematic diagram of the third pulse modulation signal PWM3 used in the display system 100 to synthesize the backlight driving signal. FIG. 7D is a schematic diagram of the composite wave CW3 of the backlight driving signal in the display system 100. As mentioned above, in the display system 100, image distortion caused by dynamic blurring is alleviated or even eliminated. The duty cycle of the backlight drive signal can be made smaller to prevent the user from seeing the pixel polarity disturbance. However, the smaller duty cycle of the backlight driving signal indicates that the driving power is also reduced, and the display screen will be dark. In order to overcome the problem of the darkness of the screen, in the foregoing embodiment, the backlight driving signal introduces a composite wave CW3 with a larger power, which is equivalent to increasing the driving voltage of the backlight module 14 in a limited third time interval, thereby improving the backlight. The function of the average brightness displayed by the module 14. For the sake of completeness of the description, the manner in which the composite wave CW3 is generated will be explained below. As described in FIGS. 7A to 7D, the composite wave CW3 in the embodiment includes two surges, but the present invention is not limited to the number of surges and the position of the surge. In Fig. 7A, the time point of the rising edge portion of the first pulse modulation signal PWM1 is P1, and the time point of the falling edge portion is P2. In Fig. 7B, the time point of the rising edge portion of the second pulse modulation signal PWM2 is P3, and the time point of the falling edge portion is P4. In Fig. 7C, the time point of the rising edge portion of the third pulse modulation signal PWM3 is P5, and the time point of the falling edge portion is P6. In the display system 100, the synthesis mode of the backlight driving signal can be linearly synthesized by a plurality of pulse modulation signals. Therefore, after the first pulse modulation signal PWM1, the second pulse modulation signal PWM2, and the third pulse modulation signal PWM3 are linearly combined, the composite wave CW3 of the 7D image can be generated. In Fig. 7D, the waveform of the composite wave CW3 includes a square wave portion (third party wave BT3) and two glitch portions RP. The time point of the rising portion of the square wave portion (third-party wave BT3) is P1, and the time point for the falling edge portion is P2. The width of the waveform of the two glitch RP corresponds to the width of the second pulse modulation signal PWM2 and the third pulse modulation signal PWM3. The widths of the two surges RP span between time point P3 and time point P4, respectively, and between time point P5 and time point P6. However, as mentioned above, any reasonable hardware changes and technical changes are within the scope of the present invention. For example, if the composite wave CW3 can contain more glitch RP, the composite wave CW3 can be synthesized using more pulse modulation signals. Moreover, the display system 100 of the present invention is also applicable to a direct back-lit display system or an edge LED back-lit display system. Moreover, in the display system 100, each of the light-emitting elements of the backlight module 14 (for example, the plurality of light-emitting diode strings D1 to DM) is simultaneously turned on in the third time interval corresponding to the composite wave CW3. And each of the light-emitting elements is simultaneously turned off outside the third time interval corresponding to the composite wave CW3. In this way, the user does not see that the backlight module 14 drives the light-emitting elements column by column to cause flickering of the screen.

In order to further reduce the problem of picture distortion caused by dynamic blur. Display system 100 can also use overdrive (OD) technology. For example, the display system 100 can pre-establish a plurality of OD-Look up tables (OD-LUTs) corresponding to a plurality of display frequencies. For example, an OD-LUT corresponding to 240 Hz (hertz), an OD-LUT corresponding to 180 Hz, an OD-LUT corresponding to 144 Hz, and an OD-LUT corresponding to 60 Hz. These OD-LUTs contain information on the gain of the voltage, such as Gain Factor. The display system 100 can query these OD-LUTs and boost the driving voltage of the driving pixels in the data clock signal according to the OD-LUT used at the current frequency. Therefore, since the driving voltage of the driving pixel is boosted, the polarity of the pixel will also quickly converge to a steady state, which further reduces the problem of picture distortion caused by dynamic blur. Also, the smaller the display frequency, the smaller the boosting magnification. The larger the display frequency, the larger the boost ratio. In other words, the boosting magnification corresponding to the display frequency of 240 Hz is greater than the boosting magnification corresponding to the display frequency of 180 Hz. The boosting magnification corresponding to the display frequency of 180 Hz is greater than the boosting magnification corresponding to the display frequency of 144 Hz. The boosting magnification corresponding to the display frequency of 144 Hz is greater than the boosting magnification corresponding to the display frequency of 60 Hz.

FIG. 8 is a schematic diagram of adjusting the dynamic brightness curve DLC in the display system 100. In order to reduce the dynamic blur, the brightness of the display screen is further improved. The display system 100 can also achieve the effect of increasing the brightness of the display screen by adjusting the dynamic brightness curve DLC. As shown in Figure 8, the X-axis is the input grayscale value and the Y-axis is the output grayscale value. The preset integral dynamic brightness curve of display system 100 can be a standard dynamic brightness curve SDLC, such as a dynamic brightness curve SDLC based on Gamma 2.0. The gray scale value of the X axis can be divided into three regions, which are a dark region DRN, a midtone region MRN, and a bright region LRN. In order to improve the brightness of the picture, the original preset standard dynamic brightness curve SDLC can be appropriately adjusted to the dynamic brightness curve DLC. At least one portion of the adjusted dynamic brightness curve DLC is above the standard dynamic brightness curve SDLC. In this embodiment, the dark portion region DRN and the bright portion region LRN of the adjusted dynamic brightness curve DLC may be above the standard dynamic brightness curve SDLC, and the midtone region MRN substantially approximates the standard dynamic brightness curve SDLC. In the present embodiment, the value range of the grayscale value G1 of the dark portion region DRN may conform to 0≦G1<10. The value range of the gray scale value G2 of the mid-range region MRN may be 10 ≦ G2 < 245. The value of the grayscale value G3 of the bright region LRN may correspond to 245 ≦ G3 < 255. However, the value range of the gray scale value of the dark portion region DRN, the middle adjustment region MRN, and the bright portion region LRN of the present invention is not limited by the above embodiment. Moreover, the dynamic brightness curve DLC can be slightly higher than the standard dynamic brightness curve SDLC under the coordinate of the X-axis gray-scale value of 0. For example, the dynamic luminance curve DLC may have an offset Delta of a grayscale value of 2 from the standard dynamic luminance curve SDLC under the coordinate of the X-axis grayscale value of zero. After adjusting the original standard dynamic brightness curve SDLC to the dynamic brightness curve DLC, the display system 100 will be able to display a brighter image.

In summary, the present invention describes a display system having a problem of image distortion caused by mitigating motion blur. The time required to display the backlight module of the system is offset from the time when the pixel polarity is transient, or slightly overlapped. Since the pixel polarity of the visible area image of the human eye approaches the steady state, the occurrence of dynamic blur can be effectively prevented. Moreover, the display system can further incorporate an overdrive technique having a plurality of drive voltmeters corresponding to a plurality of display frequencies. Overdrive technology can boost the driving voltage of the pixel, so the polarity of the pixel will also become a steady state quickly, which can further reduce the image distortion caused by dynamic blur. Moreover, in order to further improve the darkness of the brightness of the display screen caused by the mitigation of the motion blur. The display system can also adjust the dynamic brightness curve, especially the dynamic brightness curve of the dark area and the bright area. By adjusting the dynamic brightness curve, the brightness of the displayed picture will be further compensated. The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

100‧‧‧Display system
10‧‧‧Processing device
11‧‧‧Image Drive
12‧‧‧ pixel array
13‧‧‧Backlight drive
14‧‧‧Backlight module
15‧‧‧voltage circuit
16‧‧‧Resistor Capacitor Circuit
17‧‧‧Drive circuit
R1, R2, R3, R4, R5, R6 and R7‧‧‧ resistors
C‧‧‧ capacitor
D1, D2 to DM‧‧‧Light Emitting Diodes
SW‧‧ switch
VCC‧‧‧High voltage
ADIM‧‧‧ divided current signal pin
PWMP‧‧‧Backlight driver signal pin
Iset‧‧‧Max current setting signal pin
Comp‧‧‧ switch control signal pin
Isen‧‧‧current control signal pin
DT1 and DT2‧‧‧ first square wave
VT2‧‧‧ second square wave
BT3‧‧‧ third-party wave
RP‧‧‧ Surge
CW3‧‧‧Composite wave
F1 and F2‧‧‧ image areas
S0 and S1‧‧‧ human eye visible area
PWM1‧‧‧ first pulse modulation signal
PWM2‧‧‧Second pulse modulation signal
PWM3‧‧‧ third pulse modulation signal
P1, P2, P3 and P4‧‧‧ points
DLC‧‧‧ dynamic brightness curve
SDLC‧‧‧ standard dynamic brightness curve
Delta‧‧‧ offset
DRN‧‧‧ dark area
MRN‧‧‧mid area
LRN‧‧‧ highlight area

Figure 1 is a block diagram of an embodiment of a display system of the present invention. Fig. 2 is a circuit diagram of the backlight driving device and the backlight module in the first drawing display system. Figure 3 is the first waveform diagram of the data clock signal, vertical sync signal, and backlight drive signal in the system shown in Figure 1. Figure 4 is a second waveform diagram of the data clock signal, vertical sync signal, and backlight drive signal in the system shown in Figure 1. Figure 5 is a third waveform diagram of the data clock signal, vertical sync signal, and backlight drive signal in the system shown in Figure 1. Figure 6 is a fourth waveform diagram of the data clock signal, vertical sync signal, and backlight drive signal in the system shown in Figure 1. Figure 7A is a schematic diagram showing the first pulse-modulation signal used in synthesizing the backlight driving signal in the system of Figure 1. Fig. 7B is a schematic diagram showing the second pulse-modulation signal used for synthesizing the backlight driving signal in the system of Fig. 1. Figure 7C is a schematic diagram showing the third pulse-modulation signal used in synthesizing the backlight driving signal in the system of Figure 1. Fig. 7D is a schematic diagram showing a composite wave of a backlight driving signal in the system of Fig. 1. Figure 8 is a schematic diagram showing the adjustment of the dynamic brightness curve in the system of Figure 1.

Claims (21)

A method for displaying an image, comprising: obtaining a data clock signal; obtaining a vertical synchronization signal; generating a backlight driving signal according to the vertical synchronization signal; and a display system according to the data clock signal, the vertical synchronization signal, and the The backlight driving signal displays an image; wherein the data clock signal includes a first square wave, the vertical synchronization signal includes a second square wave, and the first square wave corresponds to the first time interval corresponding to the second square wave One of the second time intervals has no intersection; and wherein the backlight driving signal comprises a composite wave, the composite wave is synthesized by a third-party wave and at least one glitch. The method of claim 1, wherein the composite wave corresponds to one of the third time intervals in the second time interval. The method of claim 1, wherein the composite wave corresponds to a portion of one of the third time intervals outside the second time interval. The method of claim 3, wherein a time corresponding to a falling edge portion of the composite wave is outside the second time interval, and a time corresponding to a rising edge portion is within the second time interval. The method of claim 3, wherein a time corresponding to a rising edge portion of the composite wave is outside the second time interval, and a time corresponding to a falling edge portion is within the second time interval. The method of claim 1, wherein the second time interval is within a third time interval corresponding to the composite wave. The method of any one of claims 2 to 6, further comprising: each of the light-emitting elements of one of the backlight modules in the backlight module is simultaneously turned on in the third time interval, and each of the light-emitting elements is The third time interval is closed at the same time. The method of claim 1, wherein the display system is a direct back-lit display system or an edge LED back-lit display system. The method of claim 1, wherein the third-party wave system of the backlight driving signal is a pulse modulation signal, and a maximum duty cycle (Peak Duty Cycle) of the pulse modulation signal is 1/20. . The method of claim 1, wherein the backlight driving signal is generated by a backlight driving control device, and the backlight driving control device generates the backlight driving signal according to the at least one pulse modulation signal. The method of claim 1, further comprising: boosting a driving voltage in the data clock signal according to one of the plurality of driving voltage tables corresponding to the plurality of display frequencies. The method of claim 11, wherein the display frequencies comprise a plurality of display frequencies from small to large, each of the driving voltage tables includes a boosting magnification, and a smaller display frequency corresponds to One of the boosting magnifications is less than a larger display frequency corresponding to one of the boosting magnifications. The method of claim 1, further comprising: adjusting a dynamic brightness curve of the display system such that at least a portion of the dynamic brightness curve is above a standard dynamic brightness curve. The method of claim 13, wherein the dynamic brightness curve comprises a dark portion region, a middle adjustment region and a bright portion region, and the adjusted dark portion of the dynamic brightness curve and the bright portion region are in the standard dynamics Above the brightness curve, and the mid-tone region substantially approximates the standard dynamic brightness curve. A display system comprising: a backlight driving device for generating a switch control signal and a current control signal according to a minute current signal, a backlight driving signal and a maximum current setting signal; and a backlight module coupled to the backlight module The backlight driving device is configured to drive at least one string of LED strings according to the switch control signal and the current control signal; wherein the backlight driving device comprises a driving circuit, and the driving circuit is divided by a plurality of resistors The circuit receives the divided current signal, receives the backlight driving signal through a resistor-capacitor circuit (RC-Circuit), and receives the maximum current setting signal through a resistor, and the backlight driving signal comprises at least one pulse modulation signal a composite wave. The display system of claim 15, wherein the backlight driving signal is generated according to a data clock signal and a vertical synchronization signal, and the data clock signal includes a first square wave, and the vertical synchronization signal includes a second party The wave, the first time interval corresponding to the first square wave and the second time interval corresponding to the second square wave have no intersection. The display system of claim 16, wherein the composite wave corresponds to one of the third time intervals in the second time interval. The display system of claim 16, wherein the composite wave corresponds to a portion of one of the third time intervals outside the second time interval. The display system of claim 18, wherein a time corresponding to a falling edge portion of the composite wave is outside the second time interval, and a time corresponding to a rising edge portion is within the second time interval. The display system of claim 18, wherein a time corresponding to a rising edge portion of the composite wave is outside the second time interval, and a time corresponding to a falling edge portion is within the second time interval. The display system of claim 16, wherein the second time interval is within a third time interval corresponding to the composite wave.