WO2020224409A1

WO2020224409A1 - Backlight driving system, backlight driving method, and display device

Info

Publication number: WO2020224409A1
Application number: PCT/CN2020/085089
Authority: WO
Inventors: 吴永凯; 唐乌力吉白尔; 连龙; 赵忠平; 郝瑞军; 王晓杰; 孙乐; 李岳峰; 张学峰; 宁伟; 郭飞翔; 胡海芳
Original assignee: 京东方科技集团股份有限公司; 鄂尔多斯市源盛光电有限责任公司
Priority date: 2019-05-09
Filing date: 2020-04-16
Publication date: 2020-11-12
Also published as: CN110299113B; CN110299113A

Abstract

A backlight driving system, a backlight driving method, and a display device. The backlight driving system comprises a power supply unit, a differential voltage waveform compilation unit, a driving unit, and an output unit. The power supply unit is configured to provide voltage for the driving unit. The differential voltage waveform compilation unit is configured to generate a corresponding differential voltage waveform according to poor display and outputting the differential voltage waveform to the driving unit. The differential voltage waveform comprises a differential voltage signal, a level signal, and a clock signal. The driving unit is configured to generate dropout voltage and driving voltage according to the voltage provided by the power supply unit and the differential voltage waveform, and transmit the dropout voltage and the driving voltage to the output unit together with the clock signal. The output unit is configured to control each LED light source of a backlight source in response to the received dropout voltage, the driving voltage and the clock signal.

Description

Backlight driving system, backlight driving method and display device

This application claims the priority of the Chinese patent application No. 201910384218.4 filed on May 9, 2019, and the contents of the above-mentioned Chinese patent application are cited here in full as a part of this application.

Technical field

The embodiments of the present disclosure relate to a backlight driving system, a backlight driving method, and a display device.

Background technique

In the field of display technology, a liquid crystal display (LCD) panel in a liquid crystal display cannot emit light by itself, and the LCD panel needs to use a backlight source located behind the LCD panel to provide light to realize image display. Since Light Emitting Diodes (LEDs) can improve the color performance of LCD panels and are more environmentally friendly, most LCD panels use LEDs as backlight sources.

For example, the LED backlight includes a plurality of LEDs, which are controlled by a common external power source, and are displayed on and off at the same time.

Summary of the invention

According to an embodiment of the present disclosure, there is provided a backlight driving system including a power supply unit, a voltage difference waveform editing unit, a driving unit, and an output unit. The power supply unit is configured to provide voltage to the driving unit; the pressure difference waveform editing unit is configured to generate a corresponding pressure difference waveform according to display failure and output to the driving unit, the pressure difference waveform includes a pressure difference signal, The level signal and the clock signal; the driving unit is configured to generate a differential voltage and a driving voltage according to the voltage provided by the power supply unit and the differential pressure waveform, and transmit them to the output unit together with the clock signal; The output unit is configured to control each LED light source of the backlight in response to the received differential voltage, driving voltage and clock signal.

For example, the driving unit further includes a synthesis unit configured to synthesize at least two of the received differential pressure waveforms, generate a comprehensive differential pressure voltage and a driving voltage, and transmit them to the output unit together with the clock signal.

For example, one of the at least two pressure difference waveforms has a fixed timing period and a fixed pressure difference, and the other of the at least two pressure difference waveforms has an unfixed timing period and an unfixed pressure difference.

For example, the output unit includes a three-state output unit and a plurality of shift register units connected in series. The three-state output unit is configured to output a three-state output voltage according to the differential voltage; the shift register unit is configured to shift and output the three-state output voltage to each of the backlight sources according to the clock signal LED light source.

For example, each of the shift register units includes a plurality of triggers corresponding to a part of the LED light sources, and each trigger controls the corresponding LED light source.

For example, the flip-flop is a D flip-flop.

For example, if the differential voltage is 0, the three-state output unit outputs high impedance, and the output unit is closed; if the differential voltage is greater than 0, the output unit is turned on, and the three-state output unit outputs The tri-state output voltage is at a high level, and the high level is the sum of the dropout voltage and the driving voltage; or if the dropout voltage is less than 0, the output unit is turned on, and the tri-state output unit The output tri-state output voltage is a low level, and the low level is the difference between the differential voltage and the driving voltage.

For example, the differential pressure voltage includes a plurality of pressure differential levels with equal differential pressures.

For example, the number of the multiple pressure difference levels is proportional to the number of the LED light sources.

For example, the pressure difference waveform editing unit generates a pressure difference waveform that is opposite to the reverse voltage according to the display failure of the reverse voltage loaded on the liquid crystal display panel corresponding to the backlight source.

For example, the pressure difference signal is a voltage difference that compensates for the poor display; the level signal is the inherent voltage value of each LED light source; and the clock signal is the liquid crystal display panel corresponding to the backlight source The voltage difference signal and the level signal correspond to the clock signal.

According to an embodiment of the present disclosure, there is provided a backlight driving method using the backlight driving system as described above, including: the pressure difference waveform editing unit generates a corresponding pressure difference waveform according to the display failure and outputs it to the driving unit, so The voltage difference waveform includes a voltage difference signal, a level signal, and a clock signal; the driving unit generates a voltage difference voltage and a driving voltage according to the voltage provided by the power supply unit and the voltage difference waveform, and transmits them together with the clock signal To the output unit; the output unit controls each LED light source of the backlight in response to the received differential voltage, driving voltage, and clock signal.

For example, the driving unit further includes a synthesis unit; the driving unit generates a differential voltage and a driving voltage according to the voltage provided by the power supply unit and the differential pressure waveform, and transmits them to the output unit together with the clock signal The method further includes: the synthesis unit synthesizes the received at least two of the differential pressure waveforms to generate a comprehensive differential pressure waveform; the driving unit generates a differential voltage according to the voltage provided by the power supply unit and the comprehensive differential pressure waveform And the driving voltage are transmitted to the output unit together with the clock signal.

For example, the output unit includes a three-state output unit and a plurality of shift register units connected in series; the output unit controls each LED light source of the backlight in response to the received differential voltage, driving voltage, and clock signal. : The three-state output unit outputs a three-state output voltage according to the differential voltage; the shift register unit shifts and outputs the three-state output voltage to each LED light source of the backlight according to the clock signal.

For example, the pressure difference waveform editing unit generating the corresponding pressure difference waveform according to the display failure includes: the pressure difference waveform editing unit generates the display failure and the switching voltage according to the flip voltage loaded on the liquid crystal display panel corresponding to the backlight source. Reverse pressure difference waveform.

According to an embodiment of the present disclosure, there is provided an LCD display device including the backlight driving system as described above.

Description of the drawings

In order to more clearly describe the technical solutions of the embodiments of the present disclosure, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below only relate to some embodiments of the present disclosure, rather than limit the present disclosure.

FIG. 1 is a structural block diagram showing a backlight driving system of an embodiment of the present disclosure;

2 is another structural block diagram showing the backlight driving system of the embodiment of the present disclosure;

3 is a schematic diagram showing the structure of an output unit of an embodiment of the present disclosure;

4 is a timing diagram showing a static pressure difference waveform and a dynamic pressure difference waveform of an embodiment of the present disclosure;

FIG. 5 is a flowchart showing a backlight driving method of an embodiment of the present disclosure.

Detailed ways

In order to make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the protection scope of the present disclosure.

Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by those with ordinary skills in the field to which this disclosure belongs. The "first", "second" and similar words used in the specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "include" and other similar words mean that the elements or items before "include" or "include" now cover the elements or items listed after "include" or "include" and their equivalents, and do not exclude other Components or objects. Similar words such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "Down", "Left", "Right", etc. are only used to indicate the relative position relationship. When the absolute position of the described object changes, the relative position relationship may also change accordingly.

As shown in FIG. 1, an embodiment of the present disclosure provides a backlight driving system, including a power supply unit, a voltage difference waveform editing unit, a driving unit, and an output unit, wherein the power supply unit is configured to provide voltage to the driving unit; The pressure difference waveform editing unit is configured to generate a corresponding pressure difference waveform according to the display failure and output to the driving unit, the pressure difference waveform includes a pressure difference signal, a level signal, and a clock signal; the driving unit is configured according to the The voltage provided by the power supply unit and the differential pressure waveform generate a differential voltage and a driving voltage, which are transmitted to the output unit together with the clock signal; the output unit is configured to respond to the received differential voltage, The driving voltage and clock signal control each LED light source of the backlight.

For example, the power supply unit, the voltage difference waveform editing unit, the driving unit, and the output unit are realized by an integrated circuit that integrates the units or realized by multiple circuits independent of each other. For example, the power supply unit is a power supply circuit, the pressure difference waveform editing unit is a pressure difference waveform compilation circuit, the driving unit is a driving circuit, and the output unit is an output circuit.

For example, a liquid crystal display device includes a liquid crystal display panel and a backlight source that provides light to the liquid crystal display panel. The backlight source includes a plurality of LED light sources and the aforementioned backlight driving system that drives the plurality of LED light sources to emit light. For example, in the embodiment of the present disclosure, the liquid crystal display panel has poor display. For example, the brightness of a certain area of the liquid crystal display panel is obviously darker than other areas. The backlight driving system addresses the display poor: first, the pressure difference waveform editing unit is used to target the area The LED light source of the corresponding backlight source is configured to compensate the voltage difference waveform of the brightness of the area. The voltage difference waveform includes a voltage difference signal, a level signal and a clock signal. The voltage difference signal is a voltage difference that compensates for poor display, namely Is the difference between the brightness of the bad area and the brightness of other areas; the level signal is the inherent voltage value of the LED light source, so the voltage difference and the inherent voltage value can be superimposed to obtain the compensated LED light source Drive voltage value; the clock signal is a clock signal of the liquid crystal display panel, and the voltage difference signal and the level signal correspond to the clock signal. Then, the pressure difference waveform is output to the driving unit, and the driving unit generates the pressure difference voltage and the driving voltage according to the pressure difference signal, the level signal and the reference voltage provided by the power supply unit of the pressure difference waveform, and the The difference voltage and the driving voltage are transmitted to the output unit. Finally, the output unit controls each LED light source of the backlight according to the differential voltage, the driving voltage and the clock signal.

It is worth noting that the power supply unit provides voltage to the drive unit, and the drive unit generates multiple pressure difference levels with equal differential pressure according to the requirements of each LED light source that needs to be compensated for display, for example, 0 to 5V is divided into 10 Differential pressure level, each differential pressure level differs by 0.5V; or 0 to 5V is divided into 50 differential pressure levels, each differential pressure level differs by 0.1V; the various differential pressure levels are arranged in equal steps, and the differential pressure The number of levels is proportional to the number of LED light sources. The more the number of LED light sources, the finer the pressure difference level division and the finer the display image of the liquid crystal display panel.

For example, as shown in FIG. 2, the output unit includes a three-state output unit and a plurality of shift register units connected in series, wherein the three-state output unit is configured to output a three-state output voltage according to the differential voltage; The shift register unit is configured to shift and output the tri-state output voltage to each LED light source of the backlight according to the clock signal. For example, as shown in FIG. 3, the output unit receives the clock signal, the differential voltage and the drive voltage transmitted by the drive unit, and combines the differential voltage (ie, OE in the figure) and the clock signal (ie, CP in the figure). ) Is transmitted to the tri-state output unit, and the tri-state output unit judges to open or close the output unit according to the differential voltage. For example, when the differential voltage is 0, it indicates that the LED light source does not need to be compensated for the differential pressure at that moment. The three-state output unit outputs high impedance and turns off the output unit; when the differential voltage is greater than 0, the output unit is turned on, and it indicates that the LED light source needs to be forward compensated at this time, then the three-state output unit outputs the three The output voltage is high, that is, the three-state output voltage is the sum of the output differential voltage and the driving voltage; when the differential voltage is less than 0, the output unit is turned on, and it indicates that the LED light source needs to be negatively directed at this time Compensation means that the three-state output voltage output by the three-state output unit is a low level, that is, the three-state output voltage is the difference between the output differential voltage and the driving voltage. That is, the three-state output unit realizes the switch function and outputs different output voltages when the switch is in the open state.

For example, the output unit is an output circuit, and the three-state output unit is a sub-circuit included in the output circuit.

The three-state output voltage is transmitted to the shift register unit, and the shift register unit shifts and outputs the corresponding three-state output voltage to each backlight source controlled by the shift register unit according to the clock signal. LED light source. For example, the output unit includes a plurality of shift register units connected in series, each shift register unit includes a plurality of flip-flops, and each flip-flop controls a corresponding LED light source. For example, the backlight source of the liquid crystal display panel includes 20 LED light sources, and each shift register unit includes 5 flip-flops. In the embodiments of the present disclosure, the flip-flops are, for example, D flip-flops or other flip-flops. Those skilled in the art should select appropriate triggers according to actual application requirements. In this case, the output unit includes at least 4 shift register units connected in series, the 5 flip-flops of shift register unit 1 correspond to the first to fifth LED light sources, and the 5 triggers of shift register unit 2 The device corresponds to the 6th to 10th LED light sources, and so on, the 5 flip-flops of the shift register unit 4 correspond to the 16th to 20th LED light sources. Through the serially connected shift register unit, according to the timing signal, the compensated driving voltage value is respectively shifted and output to each LED light source, so as to realize the control of each LED light source.

Considering that the liquid crystal display panel may have different display defects at the same time, in the embodiment of the present disclosure, the driving unit, for example, further includes a synthesis unit configured to synthesize at least two of the received voltage difference waveforms to generate a comprehensive voltage difference voltage And the driving voltage are transmitted to the output unit together with the clock signal. For example, in the embodiment of the present disclosure, the liquid crystal display panel has both a first display defect and a second display defect: the first display defect is a defect in which the display brightness of a certain area is significantly different from that of other areas. The second display failure is a display failure of the liquid crystal display panel for a certain display screen. For example, as shown in FIG. 4, the first display failure is a static display failure, and the pressure difference waveform editing unit generates a pressure difference waveform for the failure. The pressure difference waveform has a fixed time sequence period and a fixed pressure difference, and is matched with The clock signal is executed cyclically; the second display failure is a dynamic display failure, and the pressure difference waveform editing unit generates a pressure difference waveform for the failure. The pressure difference waveform has a non-fixed timing period and a fixed pressure difference, which cooperates with all The clock signal is executed cyclically. In order to solve the two display defects of the liquid crystal display panel at the same time, the synthesis unit of the drive unit synthesizes the two differential pressure waveforms into a comprehensive differential pressure waveform according to the clock signal. The comprehensive differential pressure waveform contains the differential pressure generated by two kinds of defects. Waveform, the corresponding comprehensive differential voltage and comprehensive driving voltage are generated by the driving unit, and the driving output unit controls each LED light source according to the comprehensive differential voltage and comprehensive driving voltage, thereby simultaneously solving the two display defects of the LCD panel and effectively improving the liquid crystal The display effect of the display panel. For example, the driving unit is a driving circuit, and the combining unit is a sub-circuit included in the driving circuit.

For example, in the embodiment of the present disclosure, the poor display is poor flicker of the liquid crystal display panel, and the poor flicker is due to the difference in the liquid crystal voltage between the positive and negative half cycles of the liquid crystal display panel. The pressure difference waveform editing unit generates a pressure difference waveform that is opposite to the reverse voltage according to the display failure of the reverse voltage loaded on the liquid crystal display panel corresponding to the backlight source. That is, for the poor display caused by the difference in the flipping voltage of the liquid crystal display panel, the LED light source of the backlight source is adjusted to compensate for the difference in the flipping voltage, so as to solve the poor flicker of the liquid crystal display panel. The poor flicker is a poor static display. The pressure difference waveform The editing unit generates a pressure difference waveform with a fixed timing cycle and a fixed pressure difference for the defect, and executes the pressure difference waveform cyclically to compensate for the flicker defect.

Corresponding to the above-mentioned backlight driving system provided by the embodiments of the present disclosure, the embodiments of the present disclosure also provide a backlight driving method using the above-mentioned backlight driving system, because the backlight driving method provided by the embodiments of the present disclosure is similar to the above-mentioned backlight driving methods provided by the embodiments of the present disclosure. The backlight driving system corresponds to that, so the foregoing embodiments are also applicable to the backlight driving method provided by the embodiments of the present disclosure, and will not be described in detail here.

As shown in FIG. 5, an embodiment of the present disclosure also provides a backlight driving method using the above-mentioned backlight driving system, including: the pressure difference waveform editing unit generates a corresponding pressure difference waveform according to the display failure and outputs it to the driving unit, The voltage difference waveform includes a voltage difference signal, a level signal, and a clock signal; the driving unit generates a voltage difference voltage and a driving voltage according to the voltage provided by the power supply unit and the voltage difference waveform, together with the clock signal Transmitted to the output unit; the output unit controls each LED light source of the backlight in response to the received differential voltage, driving voltage, and clock signal.

For example, in an embodiment of the present disclosure, the driving unit further includes a synthesis unit; the driving unit generates a voltage difference voltage and a driving voltage according to the voltage provided by the power supply unit and the voltage difference waveform, and the clock signal The simultaneous transmission to the output unit further includes: the synthesis unit synthesizes the received at least two of the differential pressure waveforms to generate a comprehensive differential pressure waveform; the driving unit is based on the voltage provided by the power supply unit and the comprehensive The voltage difference waveform of the generated voltage difference voltage and the driving voltage are transmitted to the output unit together with the clock signal.

For example, in an embodiment of the present disclosure, the output unit includes a three-state output unit and a plurality of shift register units connected in series; the output unit responds to the received differential voltage, driving voltage and clock signal control Each LED light source of the backlight further includes: the three-state output unit outputs a three-state output voltage according to the differential voltage; the shift register unit shifts and outputs the three-state output voltage to the all according to the clock signal The LED light sources of the backlight source.

The embodiment of the present disclosure also provides an LCD display device, including the above-mentioned backlight driving system. The display device includes any product or component with display function, such as electronic paper, mobile phone, tablet computer, television, monitor, notebook electric running, digital photo frame, navigator, etc.

The embodiments of the present disclosure provide a backlight driving system and a backlight driving method. The pressure difference waveform editing unit generates the corresponding pressure difference waveform according to the display failure, and the driving circuit generates the pressure difference voltage and the driving voltage to control the output unit to independently control the backlight source. Each LED light source effectively improves the display effect of the LCD panel.

The foregoing descriptions are merely exemplary implementations of the present disclosure, and are not used to limit the protection scope of the present disclosure, which is determined by the appended claims.

Claims

A backlight driving system includes a power supply unit, a pressure difference waveform editing unit, a driving unit and an output unit, wherein

The power supply unit is configured to provide voltage to the driving unit;

The pressure difference waveform editing unit is configured to generate a corresponding pressure difference waveform according to the display failure and output it to the driving unit, and the pressure difference waveform includes a pressure difference signal, a level signal, and a clock signal;

The driving unit is configured to generate a pressure difference voltage and a driving voltage according to the voltage provided by the power supply unit and the pressure difference waveform, and transmit them to the output unit together with the clock signal;

The output unit is configured to control each LED light source of the backlight source in response to the received differential voltage, driving voltage, and clock signal.
The backlight driving system according to claim 1, wherein the driving unit further comprises a synthesizing unit configured to synthesize the received at least two of the voltage difference waveforms to generate a synthesized voltage difference voltage and a driving voltage, and the clock The signal is transmitted to the output unit together.
4. The backlight driving system of claim 2, wherein one of at least two of the differential pressure waveforms has a fixed timing period and a fixed differential pressure, and the other of the at least two differential pressure waveforms has an unfixed timing period And not fixed pressure difference.
The backlight driving system according to any one of claims 1 to 3, wherein the output unit comprises a three-state output unit and a plurality of shift register units connected in series, wherein,

The three-state output unit is configured to output a three-state output voltage according to the pressure difference voltage;

The shift register unit is configured to shift and output the tri-state output voltage to each LED light source of the backlight according to the clock signal.
4. The backlight driving system of claim 4, wherein each of the shift register units includes a plurality of flip-flops respectively corresponding to a part of the LED light sources, and each flip-flop controls the corresponding LED light source.
The backlight driving system according to claim 5, wherein the trigger is a D trigger.
The backlight driving system according to claim 4, wherein:

If the differential voltage is 0, the three-state output unit outputs high impedance, and the output unit is turned off;

If the differential voltage is greater than 0, the output unit is turned on, and the tri-state output voltage output by the three-state output unit is a high level, and the high level is the sum of the differential voltage and the driving voltage ;or

If the dropout voltage is less than 0, the output unit is turned on, and the tri-state output voltage output by the three-state output unit is low level, and the low level is the difference between the dropout voltage and the driving voltage .
7. The backlight driving system according to any one of claims 1-7, wherein the differential pressure voltage comprises a plurality of differential pressure levels with equal differential pressures.
8. The backlight driving system of claim 8, wherein the number of the plurality of pressure difference levels is proportional to the number of the LED light sources.
The backlight driving system according to any one of claims 1-9, wherein the pressure difference waveform editing unit generates a reverse voltage display error according to the reverse voltage of the liquid crystal display panel loaded on the backlight source. The pressure difference waveform in the direction of the
The backlight driving system according to any one of claims 1-10, wherein:

The pressure difference signal is a voltage difference that compensates for the poor display;

The level signal is the intrinsic voltage value of each LED light source; and

The clock signal is a clock signal of the liquid crystal display panel corresponding to the backlight source, and the voltage difference signal and the level signal correspond to the clock signal.
A backlight driving method using the backlight driving system of any one of claims 1-11, comprising:

The pressure difference waveform editing unit generates a corresponding pressure difference waveform according to the display failure and outputs it to the driving unit, and the pressure difference waveform includes a pressure difference signal, a level signal, and a clock signal;

The driving unit generates a pressure difference voltage and a driving voltage according to the voltage provided by the power supply unit and the pressure difference waveform, and transmits them to the output unit together with the clock signal;

The output unit controls each LED light source of the backlight source in response to the received voltage difference voltage, driving voltage and clock signal.
The backlight driving method according to claim 12, wherein:

The driving unit further includes a synthesis unit;

The driving unit generating a pressure difference voltage and a driving voltage according to the voltage provided by the power supply unit and the pressure difference waveform, and transmitting to the output unit together with the clock signal further includes:

The synthesis unit synthesizes at least two of the received pressure difference waveforms to generate a comprehensive pressure difference waveform;

The driving unit generates a pressure difference voltage and a driving voltage according to the voltage provided by the power supply unit and the integrated pressure difference waveform, and transmits them to the output unit together with the clock signal.
13. The backlight driving method of claim 13, wherein one of at least two of the differential pressure waveforms has a fixed timing period and a fixed differential pressure, and the other of the at least two differential pressure waveforms has an unfixed timing period And not fixed pressure difference.
The backlight driving method according to any one of claims 12-14, wherein:

The output unit includes a three-state output unit and a plurality of shift register units connected in series;

The output unit controlling each LED light source of the backlight source in response to the received differential voltage, driving voltage and clock signal further includes:

The tri-state output unit outputs a tri-state output voltage according to the pressure difference voltage;

The shift register unit shifts and outputs the tri-state output voltage to each LED light source of the backlight source according to the clock signal.
The backlight driving method according to claim 15, wherein:

If the differential voltage is 0, the three-state output unit outputs high impedance, and the output unit is turned off;

If the differential voltage is greater than 0, the output unit is turned on, and the tri-state output voltage output by the three-state output unit is a high level, and the high level is the sum of the differential voltage and the driving voltage ;or

If the dropout voltage is less than 0, the output unit is turned on, and the tri-state output voltage output by the three-state output unit is low level, and the low level is the difference between the dropout voltage and the driving voltage .
The backlight driving method according to any one of claims 12-16, wherein the differential pressure waveform editing unit generating the corresponding differential pressure waveform according to the display failure comprises: the differential pressure waveform editing unit according to the loading on the backlight The display failure of the flip voltage of the liquid crystal display panel corresponding to the source generates a voltage difference waveform opposite to the flip voltage.
The backlight driving method according to any one of claims 12-17, wherein:

The pressure difference signal is a voltage difference that compensates for the poor display;

The level signal is the intrinsic voltage value of each LED light source; and

The clock signal is a clock signal of the liquid crystal display panel corresponding to the backlight source, and the voltage difference signal and the level signal correspond to the clock signal.
An LCD display device comprising the backlight driving system according to any one of claims 1-11.