CN216388723U - Backlight driving circuit, backlight module and display device - Google Patents
Backlight driving circuit, backlight module and display device Download PDFInfo
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Abstract
The utility model provides a backlight driving circuit, a backlight module and a display device, wherein the backlight driving circuit comprises: the control chip is used for analyzing and calculating to obtain light emitting control signals of each light emitting area in the backlight source according to the received data signals; the driving chip is used for receiving the light-emitting control signal and providing driving voltage corresponding to each light-emitting area through the feedback pin; and the filtering chip is used for adjusting the circuit state of the filtering chip according to the time sequence control signal so as to filter the driving voltage. Therefore, the switch on each feedback pin can be controlled by utilizing the time sequence control signal to adjust the size of the internal capacitance of the connecting channel of each feedback pin, so that the peak voltage caused by uneven wiring of the feedback pins is offset, and the problem that the pins of the LED driving chip are damaged due to the large peak voltage of the feedback pins can be effectively solved.
Description
Technical Field
The utility model relates to the technical field of display, in particular to a backlight driving circuit, a backlight module and a display device.
Background
At present, Liquid Crystal Displays (LCDs) are widely used, and in terms of technical development trend, how to reduce the power consumption of the backlight is most concerned. Because the backlight source is the largest energy consumer, the power consumption of the backlight is reduced, and the power consumption of the whole machine is also greatly reduced. The technologies include improving a driving circuit of a backlight, improving Light-Emitting efficiency of a Light-Emitting Diode (LED), and developing a new LED type, and currently, a Local Dimming (Local Dimming) technology is the easiest to implement and the most obvious technology among the technologies. The local backlight adjusting technology utilizes backlight composed of hundreds of LEDs to replace CCFL backlight lamps, the backlight LEDs can be adjusted according to the brightness of images, the brightness of a high-brightness part in the images of the display screen can be maximized, and meanwhile, the brightness of a dark part can be reduced or even closed, so that the optimal contrast is achieved. Thus, the reduction in the brightness of the dark area reduces the power consumption of the backlight.
The existing driving chip of the backlight source generally controls the backlight source through a feedback pin, and during the driving process, surge current and peak voltage are easily generated at the feedback pin, which forms an interference source and generates noise. In order to eliminate the spike voltage at the feedback pin, the existing solution reserves a capacitance of 100pF near each feedback pin. But for a local backlight-adjusted driver chip, one feedback pin control is required for each backlight LED partition. Taking the driving scheme of a1231T R6 as an example, as shown in fig. 1a, an LED array of the backlight 110 is divided into 432 partitions, which require 9 LED driving chips LD1 to LD9, and each LED driving chip (any one of LD1 to LD 9) in the backlight driving circuit 120 has 48 channels (FB1 to FB48) controlled therein, as shown in fig. 1b, the backlight driving circuit 120 includes a second connector 121, a driving chip 122, and a control chip 123, the driving chip 122 has 9 LED driving chips LD1 to LD9, the second connector 121 has 9 connectors CN21 to CN29 matching the number and pins of the LED driving chips, one end of the second connector is correspondingly connected to the LED driving chips LD1 to LD9, and the other end is sequentially connected to the flexible circuit boards FPC1 to FPC 9. The LED driving chips LD 1-LD 9 are correspondingly connected to the corresponding partitions in the backlight 110 through the flexible circuit boards FPC 1-FPC 9 connected with the connectors CN 21-CN 29 on the PCBA, and if a capacitor is placed near each feedback pin, 432 capacitors are needed, which needs a larger PCBA shape and also has certain challenges for the layout of components. Meanwhile, in the scene of local backlight adjustment, the peak values of the voltages of the feedback pins of the filter capacitors (with the same capacitance values) under the same setting condition are different, as shown in fig. 2. It is possible that the peak voltage at some feedback pin or pins may exceed their safety threshold, resulting in damage to the feedback pin of the LED driver chip.
SUMMERY OF THE UTILITY MODEL
In order to solve the above technical problems, the present invention provides a backlight driving circuit, a backlight module and a display device.
In one aspect, the present invention provides a backlight driving circuit, which is connected to each light emitting area of a backlight source through a flexible circuit board to control the brightness of each light emitting area, respectively, wherein the backlight driving circuit includes:
the control chip is used for receiving the data signals and obtaining the light emitting control signals of the light emitting areas according to the data signals through analysis and calculation;
the driving chip is connected with the control chip and used for receiving the light-emitting control signal and providing driving voltage corresponding to each light-emitting area through a feedback pin;
a filter chip connected with the feedback pin of the drive chip for adjusting the circuit state thereof according to the time sequence control signal to filter the drive voltage,
the input pins of the filter chip are matched with the number of the feedback pins of the driving chip and are equal to the number of channels of each light-emitting area.
Furthermore, one end of the flexible circuit board is connected to each light-emitting area of the backlight source through a first connector, and the second end of the flexible circuit board is connected to the output pin of the filter chip through a second connector.
Furthermore, the filter chip has input/output channels corresponding to the feedback pins of the driver chip,
at least one switched capacitor network is coupled in any one of the input and output channels.
Further, the aforementioned at least one switched capacitor network includes a plurality of parallel filter branches, and each filter branch includes:
and the switch and the capacitor are connected between the input pin of the filter chip and the ground in series.
Further, the control chip is further configured to generate a plurality of timing control signals according to the light-emitting control signal, where the timing control signals are used to control switching between on and off states of the filtering branches.
Further, the at least one switched capacitor network includes a first switched capacitor network, a second switched capacitor network, and a third switched capacitor network, where capacitance values of capacitors in the same switched capacitor network are the same, and capacitance values of capacitors in different switched capacitor networks are different.
Further, the aforementioned filter chip has a data signal port, a timing control signal port, and a ground port, and the filter chip further includes:
and the control unit receives the time sequence control signal through the time sequence control signal port to logically control the connection and disconnection states of the filtering branch circuits.
Furthermore, the time sequence control signal port of the filter chip is connected with the control chip through a serial clock line, and the data signal port of the filter chip is connected with the control chip through a serial data line.
In another aspect, the present invention provides a backlight module, which includes:
the backlight source comprises a plurality of light emitting areas which are arranged separately; and
the backlight driving circuit is connected to each light emitting area of the backlight source through the flexible circuit board to control the brightness of each light emitting area respectively.
In another aspect, the present invention provides a display device, including:
a display panel; and
a backlight module as described above.
According to the backlight driving circuit, the backlight module and the display device, the switch in each switched capacitor network can be controlled by utilizing the time sequence control signal to adjust the size of the internal capacitor of each channel, so that the peak voltage caused by uneven wiring of each feedback pin in a backlight driver is offset, and the problem that the pins of an LED driving chip are damaged due to the fact that the peak voltage of the feedback pin is large can be effectively reduced.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.
FIG. 1a is a schematic diagram illustrating a sectional structure of a backlight LED array in a conventional local backlight adjusting scheme;
FIG. 1b is a schematic diagram of a backlight driving circuit connected to the backlight source of FIG. 1 a;
FIG. 2 shows a schematic of a voltage waveform at the feedback pin in a prior art partial backlight adjustment scheme;
fig. 3 is a block diagram illustrating a structure of a backlight module according to an embodiment of the utility model;
FIG. 4 is a circuit diagram of a backlight driving circuit in the backlight module shown in FIG. 3;
fig. 5a and 5b respectively show a block diagram and a schematic circuit structure diagram of a filter chip in the backlight driving circuit shown in fig. 4;
FIG. 6 is a schematic diagram showing a voltage waveform at a feedback pin of a filter chip in the backlight driving circuit shown in FIG. 3;
fig. 7 is a block diagram showing a structure of a display device according to an embodiment of the present invention.
Detailed Description
To facilitate an understanding of the utility model, the utility model will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The utility model may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.
The liquid crystal display device can be a display device with a display panel, such as a mobile phone, a tablet computer, a notebook computer, a palm computer, a liquid crystal television and the like. The Liquid Crystal television may be a Liquid Crystal Display device such as a Thin Film Transistor Liquid Crystal Display (TFT-LCD).
In the liquid crystal display device, a Local Dimming backlight time-sharing driving circuit is mostly arranged to drive the backlight LED lamp to work, and the Local backlight adjusting backlight time-sharing driving circuit plays a very important role in improving the density of backlight light sources, reducing the driving cost and the like, so the Local Dimming circuit driven in a time-sharing mode can be applied to a large-size high-resolution television needing to further increase the number of backlight partitions.
The LCD color tv using the LED backlight technology has the advantages of long service life, power and energy saving, and convenient driving. There are two LED backlight schemes: one is direct type, and a plurality of lamps are directly arranged below the screen; the other type is a side-in type, a plurality of lamps are distributed on the periphery of the screen, and light is uniformly guided to the LCD screen through a light guide plate. Both of the above two LED backlight schemes are commonly used, wherein the direct type has more advantages, and the most important advantage is that the local backlight adjustment function can be realized. The so-called local backlight adjustment is to divide the lamps behind the screen into a plurality of groups, such as 32 groups, 64 groups and 128 groups, wherein each group is formed by a plurality of lamp beads in a series connection mode, generally, the more the groups are, the thinner the groups are, the better the dimming effect is, and the brightness of each group of lamps is determined by the brightness of the picture, so that the display effect is better, and more energy and power are saved. The local backlight adjusting system is divided into a driving device and a lamp strip, wherein the driving device receives a local backlight adjusting signal provided by a T-CON board or a mainboard through a special driving IC, demodulates the local backlight adjusting signal and then sends the demodulated local backlight adjusting signal to drivers of a plurality of channels.
In the case of large-sized television backlights, many partitions are required. Therefore, a plurality of driving chips are required to be configured for implementation, the cost of the driving chips is high, and the plurality of driving chips are controlled to work simultaneously, so that the control algorithm of the MCU is complex, the production cost and the design difficulty of the backlight driver are increased, and the application and the development of the local backlight adjusting technology on middle and low-end machines are limited.
The present invention will be described in detail below with reference to the accompanying drawings.
Fig. 3 shows a block diagram of a backlight module according to an embodiment of the present invention, fig. 4 shows a circuit diagram of a backlight driving circuit in the backlight module shown in fig. 3, and fig. 5a and 5b respectively show a block diagram of a filter chip in the backlight driving circuit shown in fig. 4 and a schematic circuit structure diagram.
Referring to fig. 3, an embodiment of the utility model provides a backlight module 200, which includes: for convenience of description of the following embodiments, the backlight source 110, the backlight driving circuit 210 and the flexible circuit board (FPC)120 connected between the backlight source 110 and the backlight driving circuit 210, in which the backlight source 110 adopts a structure similar to the structure of dividing the area of the backlight source LED array in the local backlight adjusting scheme shown in fig. 1a, and includes a plurality of light emitting areas separately, and the driving scheme of a1231T R6 is also taken as an example, wherein the LED array of the backlight source 110 is divided into 432 partitions, and 9 LED driving chips LD1 to LD9 are required, and each LED driving chip LD1 to LD9 controls 48 channels (FB1 to FB48), as shown in fig. 4, the flexible circuit board (FPC)120 is not necessarily in a singular form, and in this embodiment, the flexible circuit board is a collective term of plural (for example, 9) FPCs 1 to FPC9, which is divided based on the structure of the backlight source 110, and in practical application, the number of structures shown in the drawings of this application is not limited by the number of the present application, the purpose is to clearly illustrate the structural correspondence in this circuit scheme.
In the backlight driving circuit 210 of the local backlight adjustment scheme, the brightness of a plurality of partitions is set to be driven and controlled by one LED driver according to the number of the partitions divided by the LED array of the backlight source 110 and the number of the driving signal output ends of the LED driver, so that local backlight adjustment can be completed only by a few LED drivers for all the partitions. If each partition is provided with a plurality of groups of LED lamp strips, the arrangement is such that one LED driver can drive a plurality of groups of LED lamp strips simultaneously.
In the present embodiment, the backlight driving circuit 210 is connected to each light exit region of the backlight through the flexible circuit boards FPC1 to FPC9 to control the luminance of each light exit region, respectively. As shown in fig. 4 to 5b, the backlight driving circuit 210 may include:
a control chip 123, wherein the control chip 123 is connected to the display panel through a flexible circuit board (not shown), and is configured to receive the Data signal Data, analyze and calculate an adjustment voltage value required by each light-emitting area in the backlight 110 according to the Data signal Data, and generate a corresponding light-emitting control signal EM;
the driving chip 122 is connected to the control chip 123, and is configured to receive the light-emitting control signal EM and provide driving voltages corresponding to the light-emitting areas through the feedback pins FB1 to FB 48;
a filter chip 221, wherein the filter chip 221 is connected to the feedback pins FB 1-FB 48 of the driver chip 122, and is configured to adjust a circuit state thereof according to a timing control signal clk to perform a filtering process on the driving voltage,
the input pins FB _ IN1 to FB _ IN48 of the filter chip 221 are matched with the feedback pins FB1 to FB48 of the driving chip IN number, and are equal to the number of channels of each light-emitting area.
Similar to fig. 1a and 1b, in the present embodiment, one end of the flexible circuit boards FPC 1-FPC 9 is connected to each light-emitting area of the backlight 110 through a first connector 111 (the first connector 111 includes 9 connectors CN 11-CN 19 matching the number of the flexible circuit boards FPC 1-FPC 9), and the second end is connected to the output pins, i.e., FB _ OUT 1-FB _ OUT48, of the filter chip 221 through a second connector 231121 (CN 21-CN 29 in fig. 4).
The flexible circuit board 120 is located at one side of the backlight module 200, connected to each light emitting area in the backlight source 110, and used for controlling the driving voltage of each light emitting area, and the flexible circuit board 120 is welded on the outer pin base of the backlight driving circuit 210 and leads out an interface. The outer leads of the outer lead base may have a larger spacing between the outer leads. An Interface is used for connecting the flexible circuit board 120 and the backlight driving circuit 210, and the Interface is, for example, a Serial Peripheral Interface (SPI).
In the present embodiment, the backlight driving circuit 210 shown in fig. 3 and 4 is different from the backlight driving circuit 120 shown in fig. 1b in that; a filter chip 221 is added, the filter chip 221 includes ICs 1-9, so LD 1-LD 9 in the driving chip 122 are uniformly connected with ICs 1-IC 9 correspondingly, in this embodiment, the filter chip 221 is formed with input and output channels corresponding to the feedback pins FB 1-FB 48 one by one, wherein taking IC1 as an example, in any input and output channel: at least one switched capacitor network is coupled as IN FB _ IN1 through FB _ OUT 1.
In this embodiment, the at least one switched capacitor network includes a plurality of parallel filter branches, and each filter branch includes: a switch and a capacitor connected in series between the input pin of the filter chip 221 and ground.
In this embodiment, the control chip 123 is further configured to generate a plurality of timing control signals clk according to the emission control signal EM, where the timing control signals clk are used to control switching of the on and off states of the filtering branches.
Referring to fig. 5b, in this embodiment, taking IC1 as an example, the aforementioned at least one switched capacitor network includes a first switched capacitor network 2211, a second switched capacitor network 2212, and a third switched capacitor network 2213, where capacitance values of capacitors in the same switched capacitor network are the same, and capacitance values of capacitors in different switched capacitor networks are different, specifically, each capacitor in first switched capacitor network 2211 is a capacitor of 100pF, each capacitor in second switched capacitor network 2112 is a capacitor of 10nF, and each capacitor in third switched capacitor network 2213 is a capacitor of 0.1 μ F.
It should be noted that, the number of the switched capacitor networks is not limited, and the number of the filtering branches in each switched capacitor network is not limited, and in practical application, the number of the filtering branches can be set according to requirements.
In the present embodiment, as shown in fig. 5a and 5b, taking an IC1 as an example, it has a data signal port, a timing control signal port, and a ground port, and the IC1 further includes:
a control unit 2214, where the control unit 2214 receives the timing control signal clk through the aforementioned timing control signal port to logically control the on and off states of each filtering branch.
In the above embodiment, the control chip 123 individually sets the adjustment voltage for one or more light emitting regions, so that the transmittance of the liquid crystal layer in the display panel changes, and the regional backlight adjustment is realized, thereby realizing low power consumption and low cost.
Further, in the present embodiment, the timing control signal port of the IC1 is connected to the aforementioned control chip 123 through the serial clock line SCL, and the data signal port of the IC1 is connected to the aforementioned control chip 123 through the serial data line SDA.
Further, in this embodiment, the control unit 2214 is, for example, a programmable logic controller, and respectively controls the switches connected to each feedback pin through an I2C protocol, to select different capacitor access circuits, and specifically, inside the chip, the switches in each switched capacitor network may be controlled by using a code signal timing sequence to adjust the size of the internal capacitance of each channel, so as to cancel the peak voltage caused by uneven routing of each feedback pin in the backlight driver, such as the voltage waveform at the feedback pin of the filter chip in the backlight driver circuit shown in fig. 6, and therefore, the backlight module 200 and the backlight driver circuit 210 thereof provided in the embodiment of the present invention can effectively reduce the problem that the pins of the LED driver chip are damaged due to the large peak voltage of the feedback pin.
Fig. 7 is a block diagram showing a structure of a display device according to an embodiment of the present invention.
Referring to fig. 7, another embodiment of the present invention further provides a display device 300, where the display device may be a mobile phone screen, a television, an electronic billboard, or another type of display device, and the display device 300 may include:
a display panel 100; and
the backlight module 200 is described in the previous embodiments.
In the present embodiment, the backlight module 200 is used to provide an area-adjustable backlight. Under the action of the backlight, the display panel is used for displaying pictures.
In the process of displaying the image, the backlight module 200 analyzes the adjustment value of each region according to the image signal to be displayed, and performs regional backlight adjustment. After the backlight emitted from the backlight module 200 is adjusted, the backlight brightness of different areas is different, thereby completing the display of the picture of the display panel 100.
Since the display device 300 has the backlight module 200 and the backlight driving circuit described above, the same advantages are obtained, and the description of the utility model is omitted here.
It should be noted that in the description of the present invention, it is to be understood that the terms "upper", "lower", "inner", and the like, indicate orientation or positional relationship, are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referenced components or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
Further, in this document, the contained terms "include", "contain" or any other variation thereof are intended to cover a non-exclusive inclusion, so that a process, a method, an article or an apparatus including a series of elements includes not only those elements but also other elements not explicitly listed or inherent to such process, method, article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the utility model may be made without departing from the scope of the utility model.
Claims (10)
1. A backlight driving circuit, which is connected to each light-emitting area of a backlight source through a flexible circuit board to control the brightness of each light-emitting area respectively, the backlight driving circuit comprising:
the control chip is used for receiving data signals and obtaining light emitting control signals of each light emitting area according to analysis and calculation of the data signals;
the driving chip is connected with the control chip and used for receiving the light-emitting control signal and providing driving voltage corresponding to each light-emitting area through a feedback pin;
a filter chip connected with the feedback pin of the drive chip for adjusting the circuit state thereof according to the time sequence control signal to filter the drive voltage,
the number of input pins of the filter chip is matched with the number of feedback pins of the driving chip, and the input pins are equal to the number of channels of each light-emitting area.
2. The backlight driving circuit according to claim 1, wherein one end of the flexible circuit board is connected to each light emitting area of the backlight source through a first connector, and the second end is connected to an output pin of the filter chip through a second connector.
3. The backlight driving circuit according to claim 2, wherein the filter chip has input/output channels corresponding to the feedback pins of the driving chip,
at least one switched capacitor network is coupled in any input/output channel.
4. The backlight driving circuit according to claim 3, wherein the at least one switched capacitor network comprises a plurality of parallel filter branches, each filter branch comprising:
and the switch and the capacitor are connected between the input pin of the filter chip and the ground in series.
5. The backlight driving circuit according to claim 4, wherein the control chip is further configured to generate a plurality of timing control signals according to the light emission control signal, and the timing control signals are configured to control switching of on and off states of the filtering branches.
6. The backlight driving circuit of claim 5, wherein the at least one switched capacitor network comprises a first switched capacitor network, a second switched capacitor network, and a third switched capacitor network, wherein the capacitance values of the capacitors in the same switched capacitor network are the same, and the capacitance values of the capacitors in different switched capacitor networks are different.
7. The backlight driving circuit according to claim 6, wherein the filter chip has a data signal port, a timing control signal port, and a ground port, and the filter chip further comprises:
and the control unit receives the time sequence control signal through the time sequence control signal port so as to logically control the connection and disconnection states of the filtering branch circuits.
8. The backlight driving circuit according to claim 7, wherein the timing control signal port of the filter chip is connected to the control chip via a serial clock line, and the data signal port of the filter chip is connected to the control chip via a serial data line.
9. A backlight module, comprising:
the backlight source comprises a plurality of light emitting areas which are arranged separately; and
the backlight driving circuit according to any one of claims 1 to 8, wherein the backlight driving circuit is connected to each light emitting area of the backlight source through a flexible circuit board to control the brightness of each light emitting area respectively.
10. A display device, comprising:
a display panel; and
a backlight module according to claim 9.
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| CN202122861090.1U CN216388723U (en) | 2021-11-22 | 2021-11-22 | Backlight driving circuit, backlight module and display device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115273762A (en) * | 2022-08-22 | 2022-11-01 | 北京显芯科技有限公司 | Driving system, display system and display device |
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| CN115273762A (en) * | 2022-08-22 | 2022-11-01 | 北京显芯科技有限公司 | Driving system, display system and display device |
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