CN110992902B - Display system and backlight control method thereof - Google Patents
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- CN110992902B CN110992902B CN201911349342.3A CN201911349342A CN110992902B CN 110992902 B CN110992902 B CN 110992902B CN 201911349342 A CN201911349342 A CN 201911349342A CN 110992902 B CN110992902 B CN 110992902B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/3413—Details of control of colour illumination sources
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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Abstract
The invention provides a display system and a backlight control method thereof. Sensing ambient light brightness when the display system is in a motion image response time mode; adjusting the output waveform of the backlight driving signal according to the change of the ambient light brightness; the duty ratio and the edge height of the output waveform are adjusted according to the ambient light brightness, but the height of the highest point in the output waveform is kept unchanged. The display system and the backlight control method thereof of the invention can modify the waveform of the lamp tube current by the ambient light information, and reduce the area of the top end under the condition that the height of the top end current and the opening width of the current are not changed. When the dynamic blurring is to be reduced, the range of the top end area superposed to the image area when the backlight is turned on is reduced, so that the dynamic picture can be clearer. And because the width of the switched-on current is unchanged, certain panel brightness can be kept, and thus, clearer dynamic picture representation can be obtained in dark places.
Description
Technical Field
The present invention relates to the field of image display technologies, and in particular, to a display system capable of reducing motion blur and a backlight control method thereof.
Background
Currently, a display for displaying an image usually utilizes a Pulse Width Modulation (PWM) signal to drive a backlight source, which is to turn on or off the backlight continuously, so that a user is susceptible to image flicker when viewing the image, and particularly when the frequency requirement is high or a high-speed dynamic image is displayed, a Motion Blur (Motion Blur) phenomenon is likely to occur, thereby reducing the display quality. In addition, even if the user does not perceive the screen flicker under the high-speed screen flicker, the user still suffers from eye fatigue after the screen viewing time is long.
The MPRT (Moving Picture Response Time) function is a recently developed technical means for reducing the blurring of a Picture, and the MPRT function can temporarily turn off the backlight during the screen transition and then turn on the backlight after the transition. The MPRT technology reduces the persistence effect of screen pictures by reducing the display time of each frame of picture on the screen, and is one of solutions for reducing visual smear and ghost. When the MPRT function is started, the backlight control mode is changed from DC dimming to PWM dimming, the duty ratio (duty) of the backlight lamp current is fixed at a specific value by the PWM dimming part, and the amplitude of the lamp current is changed by adjusting the PWM value, so that the backlight brightness is changed. In addition to the above brightness adjustment method, the MPRT technology sets the duty ratio of the lamp current, where the duty ratio of the lamp current is a fixed value and the ratio is set so that the clearer the dynamic picture is, but the lamp current waveform of the backlight brightness is not dynamically adjusted.
It is known to adjust the backlight brightness of the display in response to the ambient brightness change, but no technique for modifying the waveform of the lamp current according to the ambient light information has been proposed in the prior art when the MPRT technique is applied to improve the motion blur. Moreover, frequent switching of the backlight may cause stroboscopic effects, and turning off a portion of the backlight may cause a portion of the screen to become less bright and less visible.
Disclosure of Invention
In view of the above technical problems, the present invention provides a display system and a backlight control method thereof capable of making a dynamic picture clearer.
The invention discloses a backlight control method of a display system, which comprises the following steps: sensing ambient light brightness when the display system is in a motion image response time mode; adjusting the output waveform of the backlight driving signal according to the change of the ambient light brightness; the duty ratio and the edge height of the output waveform are adjusted according to the ambient light brightness, but the height of the highest point in the output waveform is kept unchanged.
Preferably, when the sensed ambient light brightness decreases, the duty cycle of the output waveform is controlled to become small and the edge height of the output waveform decreases.
Preferably, when the sensed ambient light brightness increases, the duty ratio of the output waveform is controlled to be increased but not to exceed a preset maximum value, and the height of the edge of the output waveform does not exceed half of the height of the highest point in the output waveform.
Preferably, the backlight control method of the present invention further includes: when the display system is in the motion image response time mode, respectively obtaining a first pulse width modulation signal comprising a first square wave, a second pulse width modulation signal comprising a second square wave and a backlight adjustment signal comprising a third square wave, wherein the first pulse width modulation signal and the second pulse width modulation signal are respectively synchronous with a vertical synchronous signal of the display system; forming a new backlight adjustment signal comprising a first mixed wave, the first mixed wave being synthesized from the second square wave and the third party wave; and adjusting the output waveform of the backlight driving signal by using the new backlight adjusting signal and the first pulse width modulation signal as input.
Further, the first square wave has a first duty cycle, the second square wave has a second duty cycle, and the first duty cycle is greater than the second duty cycle by a first preset value; the second duty ratio is adjusted according to the change of the ambient light brightness, and the duty ratio of the output waveform corresponds to the second duty ratio.
Or further, the first mixed wave is formed by mixing the second square wave and the third square wave in a logic or mode.
Or further, the amplitude of the backlight driving signal is controlled by the new backlight adjusting signal, and the duty ratio of the backlight driving signal is controlled by the first pulse width modulation signal.
The invention also provides a display system, which comprises an ambient light sensor, a controller, a driver and a backlight source; the controller is used for controlling the starting of the motion image response time mode; when the display system is in the motion image response time mode, the ambient light sensor is used for sensing ambient light brightness and transmitting a brightness change signal to the controller; the controller is used for controlling the driver according to the brightness change signal, and the driver is used for driving the backlight source through a backlight driving signal with an output waveform; when the ambient light intensity sensed by the ambient light sensor changes, the duty ratio and the edge height of the output waveform are adjusted according to the brightness change signal, and the height of the highest point in the output waveform is kept unchanged.
Preferably, when the ambient light intensity sensed by the ambient light sensor decreases, the duty ratio of the output waveform decreases, and the edge height of the output waveform decreases.
Preferably, when the ambient light intensity sensed by the ambient light sensor increases, the duty cycle of the output waveform increases but does not exceed a preset maximum value, and the height of the edge of the output waveform does not exceed half of the height of the highest point in the output waveform.
Preferably, when the display system is in the motion image response time mode, the controller is configured to output a first pulse width modulation signal including a first square wave, a second pulse width modulation signal including a second square wave, and a backlight adjustment signal including a third square wave, wherein the first pulse width modulation signal and the second pulse width modulation signal are respectively synchronized with a vertical synchronization signal of the display system; the controller further comprises a mixer for forming a new backlight adjustment signal comprising a first mixed wave synthesized from the second square wave and the third party wave; the driver adjusts an output waveform of the backlight driving signal using the new backlight adjustment signal and the first pulse width modulation signal as inputs.
Further, the first square wave has a first duty cycle, the second square wave has a second duty cycle, and the first duty cycle is greater than the second duty cycle by a first preset value; the second duty ratio is adjusted according to the brightness change signal, and the duty ratio of the output waveform corresponds to the second duty ratio.
Further, the first mixed wave is formed by mixing the second square wave and the third square wave in a logic or mode.
Further, the driver controls the amplitude of the backlight driving signal by using the new backlight adjusting signal, and controls the duty ratio of the backlight driving signal by using the first pulse width modulation signal.
Compared with the prior art, the display system and the backlight control method thereof of the invention can modify the waveform of the lamp tube current by the ambient light information, and reduce the area of the top end under the condition that the height of the top end current and the opening width of the current are not changed. When the dynamic blurring is to be reduced, the range of the top end area superposed to the image area when the backlight is turned on is reduced, so that the dynamic picture can be clearer. And because the width of the switched-on current is unchanged, certain panel brightness can be kept, and thus, clearer dynamic picture representation can be obtained in dark places.
Drawings
Fig. 1 is a block diagram of a display system according to an embodiment of the invention.
Fig. 2 is a circuit architecture diagram of a display system according to an embodiment of the invention.
Fig. 3 is a waveform diagram of a correlation signal according to an embodiment of the invention.
Fig. 4 is a schematic diagram of an output waveform of a backlight driving signal in an ideal state according to an embodiment of the invention.
Fig. 5 is a schematic diagram of an output waveform of a backlight driving signal in an actual state according to an embodiment of the invention.
Fig. 6 is a flowchart of a backlight control method according to an embodiment of the invention.
Fig. 7 is a flowchart illustrating a method for adjusting a backlight driving signal according to an embodiment of the invention.
Detailed Description
In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.
Referring to fig. 1, fig. 1 is a block diagram of a display system according to an embodiment of the invention. The display system 100 of the invention comprises an ambient light sensor 1, a controller 2, a driver 3 and a backlight 4.
The controller 2 is for controlling the turn-on of a Moving Picture Response Time (MPRT) mode.
When the display system 100 is in the moving image response time mode, the ambient light sensor 1 is used for sensing the ambient light level and transmitting a brightness change signal to the controller 2.
The controller 2 is configured to control the driver 3 according to the luminance variation signal, and the driver 3 is configured to drive the backlight 4 by a backlight driving signal having an output waveform.
When the ambient light intensity sensed by the ambient light sensor 1 changes, the duty ratio and the edge height of the output waveform are adjusted according to the brightness change signal, and the height of the highest point in the output waveform is kept unchanged. Preferably, the output waveform of the backlight driving signal is adjusted within a vertical synchronization signal region of the display system.
In practical applications, the ambient light sensor 1 can automatically update the external ambient brightness, and the controller 2 (e.g. MCU) controls the driver 3 through a plurality of PWM pins, and controls the backlight driving signal (e.g. lamp current) to change through the driver 3.
Preferably, when the ambient light level sensed by the ambient light sensor 1 decreases, the duty ratio of the output waveform becomes small and the edge height of the output waveform decreases.
Preferably, when the ambient light intensity sensed by the ambient light sensor 1 increases, the duty ratio of the output waveform becomes larger but does not exceed a preset maximum value, and the height of the edge of the output waveform does not exceed half of the height of the highest point in the output waveform.
Referring to fig. 2 and fig. 3 in combination, fig. 2 is a circuit architecture diagram of a display system according to an embodiment of the invention, and fig. 3 is a waveform diagram of related signals according to an embodiment of the invention. In one embodiment, the controller 2 is configured to output a first pulse width modulation signal 21 comprising a first square wave, a second pulse width modulation signal 22 comprising a second square wave, and a backlight adjustment signal 23 comprising a third square wave when the display system 100 is in the moving image response time mode, wherein the first pulse width modulation signal 21 and the second pulse width modulation signal 23 are respectively synchronized with the vertical synchronization signal 20 of the display system 100. The controller 2 further comprises a mixer 5, the mixer 5 being adapted to form a new backlight adjustment signal 51 comprising a first mixed wave, the first mixed wave being composed of the second square wave and the third party wave. The driver 3 adjusts the output waveform of the backlight driving signal 31 using the new backlight adjustment signal 51 and the first pulse width modulation signal 21 as inputs.
With continued reference to fig. 3, the first square wave of the first pwm signal 21 has a first duty cycle, and the second square wave of the second pwm signal 22 has a second duty cycle k, where the first duty cycle is greater than the second duty cycle k by a first preset value m, and if m is 2%, the first duty cycle is k + 2%, and this value is not constant, which is only an example. The second duty ratio k is adjusted according to the brightness change signal, and the duty ratio of the output waveform of the backlight driving signal corresponds to the second duty ratio k. In addition, the waveforms shown in fig. 3 are all plotted with time T on the horizontal axis and voltage V on the vertical axis.
Preferably, the first mixed wave of the new backlight adjustment signal 51 is mixed in a logical or form of the second square wave of the second pulse width modulated signal 22 and the third square wave of the backlight adjustment signal 23 for controlling the lamp current.
In the MPRT design technique, a new backlight adjustment signal can be formed to be used as the a-DIM input waveform for the Driver 3 (e.g., Driver IC) by mixing the second pulse width modulation signal (MPRT-PWM2) waveform synchronized with the vertical synchronization signal (V SYNC) with the backlight adjustment signal (BL _ ADJ). The first pulse width modulation signal (MPRT-PWM1_ PDIM) is a P-DIM waveform synchronized with the vertical synchronization signal (V SYNC).
Preferably, the driver 3 controls the amplitude of the backlight driving signal with the new backlight adjusting signal 51 and controls the duty cycle of the backlight driving signal with the first pulse width modulation signal 21.
With continued reference to fig. 2, the controller 2 includes a plurality of related general purpose input/output ports, and the backlight adjusting signal 23 and the second pwm signal 22 outputted from the controller 2 are mixed by using a logic OR (OR) element to obtain a new backlight adjusting signal 51, and then the new backlight adjusting signal 51 is inputted into the driver 3, the new backlight adjusting signal 51 is inputted into the a-DIM pin of the driver 3, and the first pwm signal 21 is inputted into the P-DIM pin of the driver 3. The driver 3 outputs power to the tube connector via the GATE pin and finally supplies power to the backlight 4 (e.g., LED tube). The lamp connector may have a plurality of current feedback pins, and the driver 3 precisely adjusts the output signal of the GATE pin through current feedback.
Referring to fig. 4 and fig. 5, fig. 4 and fig. 5 are schematic diagrams of output waveforms of the backlight driving signal in an ideal state and an actual state, respectively, according to an embodiment of the present invention. The waveforms shown in fig. 4 and 5 are plotted with time T on the horizontal axis and current I on the vertical axis. The waveform diagram of fig. 4 corresponds to the lamp current, i.e. the GATE pin output waveform to driver 3. In an ideal situation, in the output waveform of the backlight driving signal 31, the height a1 at the highest point of the waveform is a fixed value and is set by the reference current ISET of the driver 3, and the height a2 at the next highest point and the duty ratio of the output waveform are adjusted according to the parameters provided by the ambient light sensor 1. In practical conditions, the output waveform of the backlight driving signal 31' in fig. 5 is affected by the capacitance, the peak shape slightly changes, but the adjustment according to the parameters provided by the ambient light sensor 1 still maintains the height a1 of the highest point of the waveform, the duty ratio of the output waveform is variable, the height a2 of the falling edge is also variable, a triangular cone structure is formed, the highest point is a cone top, and the height gradually decreases from the highest point with the height a1 to the falling edges on both sides, wherein the lowest height of one falling edge is a 2.
The display system can be an electronic device such as a display, a television, a mobile phone and the like, and is matched with an external optical sensor to divide the ambient brightness into a plurality of sections. When the MPRT function is started, the corresponding range of the duty ratio value of the waveform of the current output by the drive chip Gate pin of the lamp tube current and the edge height is adjusted according to the ambient brightness information. When the ambient brightness becomes dark, the output lamp tube current waveform is modified, so that the definition of the whole dynamic picture is improved. The duty ratio can be adjusted in a gentle mode, and the flicker situation is avoided. The controller judges whether the current mode is the MPRT mode; if the MPRT mode is adopted, the value of the ambient light brightness is captured, and the appropriate duty ratio value is adjusted to the edge height value, so that the lamp current waveform with the clearest current MPRT measurement value is obtained.
The present invention aims to solve the problem that when the ambient light changes, whether the time point of the ambient dimming can be utilized to modify the waveform of the lamp current is changed, and under the condition that the first pulse width modulation signal (MPRT-PWM1_ PDIM) is not changed, that is, under the condition that the pulse width of the lamp current is not changed, the duty ratio value of the lamp current waveform output by the Driver IC Gate pin is reduced and the edge height is reduced, so that the area of the top end of the output waveform is small, and further the area of the overlapping influence picture is reduced, thereby improving the definition of the image. In the known prior art, how to adjust the pulse width or brightness of the backlight PWM by using the ambient light brightness; the invention does not focus on adjusting the backlight brightness according to the ambient light brightness, but focuses on modifying the waveform of the driving signal in the MPRT mode according to the ambient light brightness, so that the definition is better.
Referring to fig. 6, fig. 6 is a flowchart illustrating a backlight control method according to an embodiment of the invention. The backlight control method of the display system comprises the following steps.
S1, sensing the ambient light level when the display system is in the moving image response time mode.
S2, adjusting the output waveform of the backlight driving signal according to the change of the environmental light brightness; the duty ratio and the edge height of the output waveform are adjusted according to the ambient light brightness, but the height of the highest point in the output waveform is kept unchanged.
Preferably, when the sensed ambient light level decreases, the duty cycle of the output waveform is controlled to become small and the edge height of the output waveform decreases.
Preferably, when the sensed ambient light brightness increases, the duty ratio of the output waveform is controlled to be increased but not to exceed a preset maximum value, and the height of the edge of the output waveform does not exceed half of the height of the highest point in the output waveform.
Referring to fig. 7, fig. 7 is a flowchart illustrating a method for adjusting a backlight driving signal according to an embodiment of the invention. The backlight control method of the present invention may further include the following steps.
S21, when the display system is in the motion image response time mode, respectively obtaining a first pulse width modulation signal including a first square wave, a second pulse width modulation signal including a second square wave, and a backlight adjustment signal including a third square wave, wherein the first pulse width modulation signal and the second pulse width modulation signal are respectively synchronized with a vertical synchronization signal of the display system.
S22, forming a new backlight adjustment signal including a first mixed wave synthesized by the second square wave and the third square wave. Preferably, the first mixed wave is formed by mixing the second square wave and the third square wave in a logical or manner.
S23, using the new backlight adjustment signal and the first pulse width modulation signal as input, adjusting the output waveform of the backlight driving signal. Preferably, the amplitude of the backlight driving signal is controlled by the new backlight adjusting signal, and the duty ratio of the backlight driving signal is controlled by the first pulse width modulation signal.
Preferably, the first square wave has a first duty cycle, the second square wave has a second duty cycle, and the first duty cycle is greater than the second duty cycle by a first preset value; the second duty ratio is adjusted according to the change of the ambient light brightness, and the duty ratio of the output waveform corresponds to the second duty ratio.
In one embodiment, the luminance (AMB value) of the ambient light can be divided into a plurality of segments, such as 5 segments, by the ambient light sensor, and the duty ratio range of the corresponding second pwm signal is divided into 5 segments, as shown in table 1 below.
TABLE 1
Assuming that the read-in AMB value AAAA is shifted by 10 to 43690, the current duty cycle value is 32 (in percentage) according to the corresponding ratio; if the original duty range is 36, when the ambient brightness is dark, the new duty range is 32 after the ambient brightness is changed, and the duty control is slowly reduced from 36% to 32%. The new target value is 38 when the duty ratio is greater than the value 38 corresponding to the number of the highest stages, and is 8 when the duty ratio is less than the minimum number of 8.
As shown in fig. 1 to 4, the ambient light is sensed by the ambient light sensor, and the controller determines the current range value of the second pwm signal after reading the current backlight brightness, and when the ambient light brightness becomes dark, the k value of the lamp current waveform outputted from the Gate pin of the driver is decreased and the a2 height is decreased, because the portion of the output waveform superimposed on the active region of the image clock signal is smaller, the picture can be made clearer. When the ambient light brightness increases, the k value correspondingly increases at the moment, and does not exceed a preset value to the maximum extent, so as to avoid excessive superposition to the active region of the image clock signal, and the value of A2 is designed to be not more than half of that of A1. The design mode can lead the dynamic picture of the panel to correspondingly reduce the brightness and increase the clearness along with the external ambient light. The adjustment range is gradually and non-step in place, thereby avoiding the user from feeling that the adjustment is too fast and further influencing the use.
The display system and the backlight control method thereof of the invention can modify the waveform of the lamp tube current by the ambient light information, and reduce the area of the top end under the condition that the height of the top end current and the opening width of the current are not changed. When the dynamic blurring is to be reduced, the range of the top end area superposed to the image area when the backlight is turned on is reduced, so that the dynamic picture can be clearer. And because the width of the switched-on current is unchanged, certain panel brightness can be kept, and thus, clearer dynamic picture representation can be obtained in dark places.
The present invention has been described in relation to the above embodiments, which are only exemplary of the implementation of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. Rather, it is intended that all such modifications and variations be included within the spirit and scope of this invention.
Claims (11)
1. A backlight control method of a display system, comprising:
sensing ambient light brightness when the display system is in a motion image response time mode; and
adjusting the output waveform of the backlight driving signal according to the change of the ambient light brightness; the duty ratio and the edge height of the output waveform are adjusted according to the ambient light brightness, but the height of the highest point in the output waveform is kept unchanged;
when the sensed ambient light brightness is reduced, controlling the duty ratio of the output waveform to be reduced or unchanged, and reducing the edge height of the output waveform; or when the sensed environmental light brightness is increased, controlling the duty ratio of the output waveform to be increased but not to exceed a preset maximum value, and controlling the edge height of the output waveform not to exceed half of the height of the highest point in the output waveform.
2. The backlight control method of claim 1, further comprising:
when the display system is in the motion image response time mode, respectively obtaining a first pulse width modulation signal comprising a first square wave, a second pulse width modulation signal comprising a second square wave and a backlight adjustment signal comprising a third square wave, wherein the first pulse width modulation signal and the second pulse width modulation signal are respectively synchronous with a vertical synchronous signal of the display system;
forming a new backlight adjustment signal comprising a first mixed wave, the first mixed wave being synthesized from the second square wave and the third party wave; and
and adjusting the output waveform of the backlight driving signal by using the new backlight adjusting signal and the first pulse width modulation signal as input.
3. The backlight control method of claim 2, wherein the first square wave has a first duty cycle, the second square wave has a second duty cycle, and the first duty cycle is greater than the second duty cycle by a first preset value; the second duty ratio is adjusted according to the change of the ambient light brightness, and the duty ratio of the output waveform corresponds to the second duty ratio.
4. The backlight control method of claim 2, wherein the first mixed wave is formed by mixing the second square wave and the third square wave in a logical or manner.
5. The backlight control method of claim 2, wherein the new backlight adjusting signal is used to control the amplitude of the backlight driving signal, and the first pulse width modulation signal is used to control the duty ratio of the backlight driving signal.
6. The backlight control method of claim 1, wherein the output waveform of the backlight driving signal is adjusted in a vertical synchronization signal region of the display system.
7. A display system comprising an ambient light sensor, a controller, a driver, and a backlight; the method is characterized in that:
the controller is used for controlling the starting of the motion image response time mode; when the display system is in the motion image response time mode, the ambient light sensor is used for sensing ambient light brightness and transmitting a brightness change signal to the controller;
the controller is used for controlling the driver according to the brightness change signal, and the driver is used for driving the backlight source through a backlight driving signal with an output waveform; when the ambient light brightness sensed by the ambient light sensor changes, the duty ratio and the edge height of the output waveform are adjusted according to the brightness change signal, and the height of the highest point in the output waveform is kept unchanged;
when the ambient light brightness sensed by the ambient light sensor is reduced, the duty ratio of the output waveform is reduced or unchanged, and the edge height of the output waveform is reduced; or when the ambient light intensity sensed by the ambient light sensor increases, the duty ratio of the output waveform increases but does not exceed a preset maximum value, and the edge height of the output waveform does not exceed half of the height of the highest point in the output waveform.
8. The display system of claim 7, wherein the controller is configured to output a first pulse width modulation signal comprising a first square wave, a second pulse width modulation signal comprising a second square wave, and a backlight adjustment signal comprising a third square wave when the display system is in the motion image response time mode, the first pulse width modulation signal and the second pulse width modulation signal being respectively synchronized with a vertical synchronization signal of the display system; the controller further comprises a mixer for forming a new backlight adjustment signal comprising a first mixed wave synthesized from the second square wave and the third party wave; the driver adjusts an output waveform of the backlight driving signal using the new backlight adjustment signal and the first pulse width modulation signal as inputs.
9. The display system of claim 8, wherein the first square wave has a first duty cycle and the second square wave has a second duty cycle, the first duty cycle being greater than the second duty cycle by a first preset value; the second duty ratio is adjusted according to the brightness change signal, and the duty ratio of the output waveform corresponds to the second duty ratio.
10. The display system of claim 8, wherein the first mixed wave is a logical or of the second square wave and the third square wave.
11. The display system as recited in claim 8 wherein said driver controls an amplitude of said backlight driving signal using said new backlight adjustment signal and controls a duty cycle of said backlight driving signal using said first pulse width modulation signal.
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