CN110299113B - Backlight driving system, backlight driving method and display device - Google Patents
Backlight driving system, backlight driving method and display device Download PDFInfo
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- CN110299113B CN110299113B CN201910384218.4A CN201910384218A CN110299113B CN 110299113 B CN110299113 B CN 110299113B CN 201910384218 A CN201910384218 A CN 201910384218A CN 110299113 B CN110299113 B CN 110299113B
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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
Abstract
The invention discloses a backlight driving system, a backlight driving method and a display device, wherein the backlight driving system comprises a power supply unit, a voltage difference waveform compiling unit, a driving unit and an output unit, wherein the power supply unit is used for supplying voltage to the driving unit; the differential pressure waveform editing unit is used for generating a corresponding differential pressure waveform according to poor display and outputting the differential pressure waveform to the driving unit, wherein the differential pressure waveform comprises a differential pressure signal, a level signal and a clock signal; the driving unit is used for generating a differential voltage and a driving voltage according to the differential voltage waveform and transmitting the differential voltage and the driving voltage to the output unit together with a clock signal; the output unit is used for responding to each LED light source of the backlight source controlled according to the received differential voltage, the driving voltage and the clock signal. According to the embodiment provided by the invention, the pressure difference waveform is generated according to different display defects, and the independent control of each LED light source of the backlight source is realized through the output unit, so that the display effect of the liquid crystal display panel is effectively improved.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a backlight driving system, a backlight driving method, and an LCD display device.
Background
In the field of display technology, the LCD panel of the LCD cannot generate light, and the LCD panel needs to generate brightness by using a backlight source located behind the panel to display an image. Because the Light Emitting Diode (LED) can improve the performance of panel colors and is relatively environment-friendly, most LCDs adopt an LED light source as a backlight source.
The traditional backlight LED circuit is formed by connecting LED light sources in series, is controlled by one or more paths of common external power supplies, and simultaneously realizes on-off during display. The latest scheme is realized by a power supply sub-module, a constant current source sub-module and a switch matrix circuit, but the circuit of each sub-module is too complex, so that the product yield is reduced, and the problem of how to independently drive the LED light source of the backlight source is to be solved.
Disclosure of Invention
In order to solve at least one of the above problems, a first aspect of the present invention provides a backlight driving system including a power supply unit, a voltage difference waveform compiling unit, a driving unit, and an output unit, wherein
The power supply unit is used for supplying voltage to the driving unit;
the differential pressure waveform compiling unit is used for generating a corresponding differential pressure waveform according to poor display and outputting the differential pressure waveform to the driving unit, wherein the differential pressure waveform comprises a differential pressure signal, a level signal and a clock signal;
the driving unit is used for generating a differential voltage and a driving voltage according to the differential voltage waveform and transmitting the differential voltage and the driving voltage to the output unit together with the clock signal;
and the output unit is used for responding to each LED light source of the backlight source controlled according to the received differential voltage, the driving voltage and the clock signal.
Furthermore, the driving unit further includes a synthesizing unit, configured to synthesize the received at least two differential voltage waveforms, generate a synchronous differential voltage and a driving voltage, and transmit the synchronous differential voltage and the driving voltage to the output unit together with the clock signal.
Further, the differential pressure waveform includes a fixed timing fixed differential pressure cycle mode and a non-fixed timing non-fixed differential pressure cycle mode.
Further, the output unit comprises a tri-state output unit and a plurality of shift register units connected in series, wherein
The tri-state output unit is used for outputting a tri-state output voltage according to the voltage difference voltage;
and the shift register unit is used for shifting and outputting the tri-state output voltage to each LED light source of the backlight source according to the clock signal.
Furthermore, the shift register unit comprises a plurality of triggers corresponding to the LED light sources one to one, and each trigger outputs a driving voltage to the corresponding LED light source.
Further, the flip-flop is a D flip-flop.
Further, the differential pressure voltage comprises a plurality of differential pressure levels with equal differential pressure.
Further, the number of differential pressure levels is directly proportional to the number of LED light sources.
Further, the differential pressure waveform compiling unit generates a differential pressure waveform in a reverse direction to the inversion voltage according to the display failure of the inversion voltage loaded on the liquid crystal display panel corresponding to the backlight source.
A second aspect of the present invention provides a backlight driving method using the backlight driving system of the first aspect, including:
the differential pressure waveform compiling unit generates a corresponding differential pressure waveform according to poor display and outputs the differential pressure waveform to the driving unit, wherein the differential pressure waveform comprises a differential pressure signal, a level signal and a clock signal;
the driving unit generates a differential voltage and a driving voltage according to the voltage provided by the power supply unit and the differential voltage waveform, and transmits the differential voltage and the driving voltage to the output unit together with the clock signal;
the output unit is responsive to control the respective LED light sources of the backlight according to the received differential voltage, drive voltage and clock signal.
Further, the driving unit further includes a synthesizing 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 voltage waveform, and transmits the differential voltage and the driving voltage to the output unit together with the clock signal further comprises:
the synthesis unit synthesizes the received at least two differential pressure waveforms to generate synchronous differential pressure waveforms;
the driving unit generates a differential voltage and a driving voltage according to the voltage provided by the power supply unit and the synchronous differential voltage waveform, and transmits the differential voltage and the driving voltage to the output unit together with the clock signal.
Further, the output unit comprises a tri-state output unit and a plurality of shift register units connected in series;
the output unit further comprises, in response to controlling each LED light source of the backlight according to the received differential voltage, driving voltage and clock signal:
the tri-state output unit outputs a tri-state output voltage according to the voltage difference voltage;
and 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.
A third aspect of the invention provides an LCD display device comprising the backlight driving system of the first aspect.
The invention has the following beneficial effects:
aiming at the existing problems, the invention provides a backlight driving system, a backlight driving method and a display device.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 shows a block diagram of a backlight driving system according to an embodiment of the present invention;
fig. 2 is a block diagram of a backlight driving system according to another embodiment of the present invention;
FIG. 3 is a schematic diagram of the output unit according to an embodiment of the present invention;
FIG. 4 illustrates a timing diagram of the static and dynamic differential pressure waveforms according to one embodiment of the present invention;
fig. 5 shows a flowchart of a backlight driving method according to an embodiment of the invention.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
As shown in fig. 1, an embodiment of the present invention provides a backlight driving system, including a power supply unit, a voltage difference waveform compiling unit, a driving unit, and an output unit, wherein the power supply unit is configured to provide a voltage to the driving unit; the differential pressure waveform compiling unit is used for generating a corresponding differential pressure waveform according to poor display and outputting the differential pressure waveform to the driving unit, wherein the differential pressure waveform comprises a differential pressure signal, a level signal and a clock signal; the driving unit is used for generating a differential voltage and a driving voltage according to the differential voltage waveform and transmitting the differential voltage and the driving voltage to the output unit together with the clock signal; and the output unit is used for responding to each LED light source of the backlight source controlled according to the received differential voltage, the driving voltage and the clock signal.
In a specific example, as shown in fig. 1, the liquid crystal display panel has a display defect, for example, the luminance of a certain area of the liquid crystal display panel is obviously darker than that of other areas, and the backlight driving system is used for the display defect: firstly, generating a differential pressure waveform for compensating the brightness of the area aiming at an LED light source of a backlight source corresponding to the area through a differential pressure waveform compiling unit, wherein the differential pressure waveform comprises a differential pressure signal, a level signal and a clock signal, and the differential pressure signal is a voltage difference value for representing and compensating poor display, namely the difference value between the brightness of the poor area and the brightness of other areas; the level signal is an inherent voltage value representing the LED light source, so that the voltage difference value and the inherent voltage value are superposed to obtain a driving voltage value compensated by the LED light source; the clock signal is a clock signal of the liquid crystal display panel, and the differential pressure signal and the level signal correspond to the clock signal. Then, the differential voltage waveform is solidified to a driving unit, and the driving unit generates a differential voltage and a driving voltage according to a differential voltage signal of the differential voltage waveform, a level signal and a reference voltage provided by a power supply unit and transmits the differential voltage and the driving voltage to an output unit. And finally, the output unit controls each LED light source of the backlight source according to the differential voltage, the driving voltage and the clock signal.
It is worth to be noted that the power supply unit provides voltage to the driving unit, and the driving unit generates a plurality of differential pressure levels with equal differential pressure according to the requirement of compensating the displayed LED light sources as required, for example, 0 to 5V is divided into 10 differential pressure levels, and each differential pressure level is different by 0.5V; or dividing 0 to 5V into 50 differential pressure levels, each differential pressure level differing by 0.1V; the pressure difference grades are arranged in an equal ladder way, the number of the pressure difference grades is in direct proportion to the number of the LED light sources, the more the number of the LED light sources is, the finer the pressure difference grade division is, and the finer the display image of the liquid crystal display panel is.
In an alternative embodiment, as shown in fig. 2, the output unit includes a tri-state output unit and a plurality of shift register units connected in series, wherein the tri-state output unit is configured to output a tri-state output voltage according to the voltage difference voltage; and the shift register unit is used for shifting and outputting the tri-state output voltage to each LED light source of the backlight source according to the clock signal. Specifically, as shown in fig. 3, the output unit receives a clock signal, a differential voltage and a driving voltage transmitted by the driving unit, and transmits the differential voltage and the clock signal to the tri-state output unit, and the tri-state output unit determines to open or close the output unit according to the differential voltage, for example, when the differential voltage is 0, it indicates that the moment does not need to perform differential voltage compensation on the LED light source, the tri-state output unit outputs high impedance, and closes the output unit; when the differential voltage is greater than 0, the output unit is turned on, and if the forward compensation needs to be carried out on the LED light source at the moment, the tri-state output voltage output by the tri-state output unit is at a high level, namely the tri-state output voltage is the sum of the output differential voltage and the driving voltage; and when the differential voltage is less than 0, the output unit is opened, and the tristate output voltage output by the tristate output unit is low level when the negative compensation needs to be carried out on the LED light source at the moment, namely the tristate output voltage is the sum of the output differential voltage and the driving voltage. Namely, the tri-state output unit realizes the switching function and outputs different tri-state output voltages when the switch is in an open state.
And transmitting the tri-state output voltage to the shift register unit, and shifting and outputting the corresponding tri-state output voltage to each LED light source of the backlight source controlled by the shift register unit according to the clock signal by the shift register unit. Specifically, 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, each shift register unit includes 5 flip-flops, and the flip-flop in this embodiment is a D flip-flop, and may be other flip-flops, and a person skilled in the art should select an appropriate flip-flop according to actual application requirements. The output unit at least comprises 4 shift register units connected in series, 5 triggers of the shift register unit 1 correspond to the 1 st to 5 th LED light sources, 5 triggers of the shift register unit 2 correspond to the 6 th to 10 th LED light sources, and so on, and 5 triggers of the shift register unit 4 correspond to the 16 th to 20 th LED light sources. And respectively shifting and outputting the compensated driving voltage values obtained by the calculation of the differential pressure waveform compiling unit to each LED light source through the shift register units connected in series according to the time sequence signals, thereby realizing the control of each LED light source.
In view of the fact that the lcd panel may have different display defects at the same time, in an alternative embodiment, the driving unit further includes a synthesizing unit for synthesizing at least two of the received differential voltage waveforms to generate a synchronous differential voltage and a driving voltage, and transmitting the synchronous differential voltage and the driving voltage to the output unit together with the clock signal. In this embodiment, the liquid crystal display panel has both the first display defect and the second display defect: the first display defect is a defect in which the display luminance of a certain specific region is significantly different from that of other regions in the above embodiment, and the second display defect is a display defect of the liquid crystal display panel on a certain display screen. As shown in fig. 4, the first display defect is a static display defect, the differential pressure waveform compiling unit generates a differential pressure waveform for the first display defect, the differential pressure waveform is a fixed timing fixed differential pressure, and the differential pressure waveform is executed in cooperation with the clock signal in a circulating manner; the second display failure is dynamic display failure, the differential pressure waveform compiling unit generates a differential pressure waveform aiming at the failure, the differential pressure waveform is a non-fixed time sequence non-fixed differential pressure and is executed in cooperation with the clock signal in a circulating mode. In order to solve two kinds of bad display of the liquid crystal display panel at the same time, a synthesis unit of a driving unit is used for synchronously synthesizing two kinds of differential pressure waveforms into a comprehensive differential pressure waveform according to a clock signal, the comprehensive differential pressure waveform comprises differential pressure waveforms generated by the two kinds of bad display, a corresponding comprehensive differential pressure voltage and a comprehensive driving voltage are generated by the driving unit, and a driving output unit is used for controlling each LED light source according to the comprehensive differential pressure voltage and the comprehensive driving voltage, so that the two kinds of bad display of the liquid crystal display panel are solved at the same time, and the display effect of the liquid crystal display panel is effectively improved.
In an optional embodiment, for the poor flicker of the liquid crystal display panel, when the poor flicker is caused, due to the difference between the positive and negative half-cycle liquid crystal clamping pressures of the liquid crystal display panel, according to the inversion time of the positive and negative half-cycles of the liquid crystal, the differential pressure waveform compiling unit generates the differential pressure waveform opposite to the inversion voltage according to the poor display of the inversion voltage loaded on the liquid crystal display panel corresponding to the backlight source. Specifically, the flicker defect of the liquid crystal display panel is solved by adjusting the LED light source of the backlight source to compensate for the display defect caused by the difference in the inversion voltage of the liquid crystal display panel, the flicker defect is a static display defect, and the differential pressure waveform compiling unit generates a differential pressure waveform with a fixed timing and a fixed differential pressure for the defect and cyclically executes the differential pressure waveform to compensate for the flicker defect.
Corresponding to the backlight driving system provided in the foregoing embodiments, an embodiment of the present application further provides a backlight driving method using the backlight driving system, and since the backlight driving method provided in the embodiment of the present application corresponds to the backlight driving systems provided in the foregoing embodiments, the foregoing embodiments are also applicable to the backlight driving method provided in the present embodiment, and detailed description is not given in this embodiment.
As shown in fig. 5, an embodiment of the present application further provides a backlight driving method using the above backlight driving system, including: the differential pressure waveform compiling unit generates a corresponding differential pressure waveform according to poor display and outputs the differential pressure waveform to the driving unit, wherein the differential pressure waveform comprises a differential pressure signal, a level signal and a clock signal; the driving unit generates a differential voltage and a driving voltage according to the voltage provided by the power supply unit and the differential voltage waveform, and transmits the differential voltage and the driving voltage to the output unit together with the clock signal; the output unit is responsive to control the respective LED light sources of the backlight according to the received differential voltage, drive voltage and clock signal.
In an alternative embodiment, the drive unit further comprises a synthesizing 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 voltage waveform, and transmits the differential voltage and the driving voltage to the output unit together with the clock signal further comprises: the synthesis unit synthesizes the received at least two differential pressure waveforms to generate synchronous differential pressure waveforms; the driving unit generates a differential voltage and a driving voltage according to the voltage provided by the power supply unit and the synchronous differential voltage waveform, and transmits the differential voltage and the driving voltage to the output unit together with the clock signal.
In another alternative embodiment, the output unit includes a tri-state output unit and a plurality of shift register units connected in series; the output unit further comprises, in response to controlling each LED light source of the backlight according to the received differential voltage, driving voltage and clock signal: the tri-state output unit outputs a tri-state output voltage according to the voltage difference voltage; and 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.
An embodiment of the present application also provides an LCD display device including the backlight driving system described above. The display device comprises any product or component with a display function, such as electronic paper, a mobile phone, a tablet personal computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
Aiming at the existing problems, the invention provides a backlight driving system and a backlight driving method, a corresponding pressure difference waveform is generated by a pressure difference waveform compiling unit according to the display failure, and the pressure difference voltage and the driving voltage are generated by a driving circuit to control an output unit to independently control each LED light source of the backlight source, so that the problems in the prior art are solved, and the display effect of the liquid crystal display panel is effectively improved.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (13)
1. A backlight driving system comprises a power supply unit, a voltage difference waveform compiling unit, a driving unit and an output unit, wherein the driving unit is used for outputting a voltage difference waveform
The power supply unit is used for supplying voltage to the driving unit;
the differential pressure waveform compiling unit is used for generating a corresponding differential pressure waveform according to poor display and outputting the differential pressure waveform to the driving unit, wherein the differential pressure waveform comprises a differential pressure signal, a level signal and a clock signal;
the driving unit is used for generating a differential voltage and a driving voltage according to the differential voltage waveform and transmitting the differential voltage and the driving voltage to the output unit together with the clock signal;
and the output unit is used for responding to each LED light source of the backlight source controlled according to the received differential voltage, the driving voltage and the clock signal.
2. The backlight driving system according to claim 1, wherein the driving unit further comprises a synthesizing unit for synthesizing the received at least two of the differential voltage waveforms to generate a synchronous differential voltage and a driving voltage, and transmitting the synchronous differential voltage and the driving voltage to the output unit together with the clock signal.
3. The backlight driving system according to claim 1 or 2, wherein the pressure difference waveform comprises a fixed timing fixed pressure difference cycle mode and an unfixed timing unfixed pressure difference cycle mode.
4. The backlight driving system according to claim 1, wherein the output unit comprises a tri-state output unit and a plurality of serially connected shift register units, wherein
The tri-state output unit is used for outputting a tri-state output voltage according to the voltage difference voltage;
and the shift register unit is used for shifting and outputting the tri-state output voltage to each LED light source of the backlight source according to the clock signal.
5. The backlight driving system according to claim 4, wherein the shift register unit comprises a plurality of flip-flops corresponding to the LED light sources one by one, each flip-flop outputting a driving voltage to the corresponding LED light source.
6. The backlight driving system according to claim 5, wherein the flip-flop is a D flip-flop.
7. The backlight driving system of claim 1, wherein the differential voltage comprises a plurality of differential voltage levels equal to each other.
8. The backlight driving system according to claim 7, wherein the number of the voltage difference levels is in direct proportion to the number of the LED light sources.
9. The backlight driving system according to claim 1, wherein the differential voltage waveform compiling unit generates a differential voltage waveform in a direction opposite to a reverse voltage according to a display defect of the reverse voltage applied to the liquid crystal display panel corresponding to the backlight source.
10. A backlight driving method using the backlight driving system according to any one of claims 1 to 9, comprising:
the differential pressure waveform compiling unit generates a corresponding differential pressure waveform according to poor display and outputs the differential pressure waveform to the driving unit, wherein the differential pressure waveform comprises a differential pressure signal, a level signal and a clock signal;
the driving unit generates a differential voltage and a driving voltage according to the voltage provided by the power supply unit and the differential voltage waveform, and transmits the differential voltage and the driving voltage to the output unit together with the clock signal;
the output unit is responsive to control the respective LED light sources of the backlight according to the received differential voltage, drive voltage and clock signal.
11. The backlight driving method according to claim 10,
the drive unit further includes a synthesizing 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 voltage waveform, and transmits the differential voltage and the driving voltage to the output unit together with the clock signal further comprises:
the synthesis unit synthesizes the received at least two differential pressure waveforms to generate synchronous differential pressure waveforms;
the driving unit generates a differential voltage and a driving voltage according to the voltage provided by the power supply unit and the synchronous differential voltage waveform, and transmits the differential voltage and the driving voltage to the output unit together with the clock signal.
12. The backlight driving method according to claim 10,
the output unit comprises a tri-state output unit and a plurality of shift register units connected in series;
the output unit further comprises, in response to controlling each LED light source of the backlight according to the received differential voltage, driving voltage and clock signal:
the tri-state output unit outputs a tri-state output voltage according to the voltage difference voltage;
and 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.
13. An LCD display device comprising the backlight driving system of any one of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910384218.4A CN110299113B (en) | 2019-05-09 | 2019-05-09 | Backlight driving system, backlight driving method and display device |
| PCT/CN2020/085089 WO2020224409A1 (en) | 2019-05-09 | 2020-04-16 | Backlight driving system, backlight driving method, and display device |
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| CN201910384218.4A CN110299113B (en) | 2019-05-09 | 2019-05-09 | Backlight driving system, backlight driving method and display device |
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| CN110299113B true CN110299113B (en) | 2020-12-11 |
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| CN110299113B (en) * | 2019-05-09 | 2020-12-11 | 京东方科技集团股份有限公司 | Backlight driving system, backlight driving method and display device |
| CN111179816B (en) * | 2020-01-09 | 2021-07-06 | Tcl华星光电技术有限公司 | Backlight driving method, backlight driving circuit and backlight driving device |
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| CN110299113B (en) * | 2019-05-09 | 2020-12-11 | 京东方科技集团股份有限公司 | Backlight driving system, backlight driving method and display device |
-
2019
- 2019-05-09 CN CN201910384218.4A patent/CN110299113B/en active Active
-
2020
- 2020-04-16 WO PCT/CN2020/085089 patent/WO2020224409A1/en active Application Filing
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| Publication number | Publication date |
|---|---|
| WO2020224409A1 (en) | 2020-11-12 |
| CN110299113A (en) | 2019-10-01 |
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