CN206864163U - The control circuit and display terminal of a kind of backlight - Google Patents
The control circuit and display terminal of a kind of backlight Download PDFInfo
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- CN206864163U CN206864163U CN201720446586.3U CN201720446586U CN206864163U CN 206864163 U CN206864163 U CN 206864163U CN 201720446586 U CN201720446586 U CN 201720446586U CN 206864163 U CN206864163 U CN 206864163U
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Abstract
The utility model embodiment discloses the control circuit and display terminal of a kind of backlight, and the control circuit includes microcontroller chip, backlight driving chip and Half Bridge Quasi Resonant circuit；Wherein, the backlight driving chip, it is respectively connected with the microcontroller chip and the backlight, the backlight control signal sent for obtaining the microcontroller chip, and the driving current by detecting backlight produces voltage adjustment signal corresponding with the backlight region；The Half Bridge Quasi Resonant circuit, is connected with the backlight driving chip, for obtaining the voltage adjustment signal, and according to the supply voltage of the voltage adjustment signal adjustment backlight region；The backlight, it is connected with the Half Bridge Quasi Resonant circuit, for adjusting the brightness of the backlight region according to the supply voltage.By using such scheme, while local backlight regulation is realized, the power consumption of backlight can be not only reduced, while the effect for reducing PCB Material Costs can also be reached.
Description
Technical Field
The embodiment of the utility model provides a relate to and show technical field, especially relate to a control circuit and display terminal of backlight.
Background
With the development of scientific technology, LEDs (Light Emitting diodes) have been widely used as backlight sources of liquid crystal displays. Especially since 2014, 4K televisions (televisions capable of receiving, decoding and displaying video signals with corresponding resolutions) with LED backlights have been pursued by more and more consumers, and meanwhile, the energy consumed by the backlights has attracted attention of various television and liquid crystal manufacturers.
In the prior art, the following driving method is generally adopted to control the operation of the backlight: 1. a constant current source is adopted to drive the backlight source; 2. and connecting the plurality of DC-DC circuits with a power supply end to serve as a voltage regulating module of the backlight source.
With the first driving method, since a constant voltage value is output, the light emission luminance of the backlight is kept constant. When a bright scene and a dark scene appear in the display screen of the television at the same time, the contrast of the light and the dark in the display screen of the television is poor because the driving current of the backlight source is constant. For the second driving method, since the backlight source in the Circuit can be divided into N small areas, N DC-DC voltage adjusting modules are required to be added to adjust the control voltages of the N small areas, which increases the space of a Printed Circuit Board (PCB) to a certain extent, increases the material cost, and also increases the first-level energy consumption, and reduces the driving efficiency.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a control circuit and display terminal of backlight has realized adjusting the luminance of backlight in real time according to the light and shade degree of picture in the display screen, has not only reduced the consumption of backlight, has brought the good experience of watching of user simultaneously.
In a first aspect, an embodiment of the present invention provides a control circuit of a backlight source, where the circuit is applied to a display terminal, the display terminal has the backlight source, and the control circuit includes: a micro-control chip, a backlight driving chip and a half-bridge quasi-resonant circuit, wherein the backlight driving chip is respectively connected with the micro-control chip, a backlight source and the half-bridge quasi-resonant circuit, the half-bridge quasi-resonant circuit is also connected with the backlight source, wherein,
the backlight driving chip is used for receiving a backlight control signal sent by the micro-control chip, generating a voltage adjusting signal corresponding to each area in the backlight source according to the backlight control signal and by detecting the driving current of the backlight source, and sending the voltage adjusting signal to the half-bridge quasi-resonant circuit;
the half-bridge quasi-resonant circuit is used for adjusting the power supply voltage of each area in the backlight source according to the voltage adjusting signal.
Further, the control circuit further comprises a first diode and a second diode, wherein,
the anode of the first diode is connected with the cathode of the second diode;
the cathode of the first diode is connected with a feedback pin of the backlight driving chip;
and the anode of the second diode is connected with the half-bridge quasi-resonant circuit.
Further, the control circuit further includes: a filter circuit and a power factor correction circuit, wherein,
the input end of the filter circuit is connected with a power grid, and the output end of the filter circuit is connected with the power factor correction circuit and used for filtering electromagnetic interference signals in the control circuit;
and the output end of the power factor correction circuit is connected with the input end of the half-bridge quasi-resonant circuit and is used for carrying out power factor correction and adjustment on the filtered voltage signal so as to improve the power factor of the control circuit.
Further, the control circuit further includes: and the overvoltage protection circuit is connected with the half-bridge quasi-resonant circuit and used for controlling the half-bridge quasi-resonant circuit to be disconnected when the power supply voltage reaches the maximum value of the preset voltage.
Further, the micro control chip is MSP430G series.
Further, the model of the backlight driving chip is IW 7027.
In a second aspect, an embodiment of the present invention provides a display terminal, the display terminal includes a backlight source and further includes any control circuit of the backlight source.
The embodiment of the utility model provides a control circuit and display terminal of backlight, display terminal has the backlight, control circuit includes: the backlight driving circuit comprises a micro-control chip, a backlight driving chip and a half-bridge quasi-resonant circuit; the backlight driving chip is respectively connected with the micro-control chip and the backlight source and is used for acquiring a backlight control signal sent by the micro-control chip and generating a voltage adjusting signal corresponding to the backlight source area by detecting the driving current of the backlight source; the half-bridge quasi-resonant circuit is connected with the backlight driving chip and is used for acquiring the voltage adjusting signal and adjusting the power supply voltage of the backlight source region according to the voltage adjusting signal; and the backlight source is connected with the half-bridge quasi-resonant circuit and used for adjusting the brightness of the backlight source region according to the power supply voltage. By adopting the technical scheme, the micro-control chip can indirectly control the half-bridge quasi-resonant circuit through the backlight driving chip, and then adjust the power supply voltage of the backlight source in real time. Compared with the prior art in which the supply voltage of the backlight source is controlled by the plurality of DC-DC modules, the scheme omits the DC-DC module, directly connects the half-bridge quasi-resonant circuit with the backlight source, saves material cost, can reduce one-level energy efficiency conversion, and can achieve the effect of improving the viewing experience of a user.
Drawings
Fig. 1 is a schematic structural diagram of a control circuit of a backlight according to a first embodiment of the present invention;
fig. 2 is a circuit diagram of a control circuit of a backlight driving chip according to a first embodiment of the present invention;
fig. 3 is a schematic diagram of a feedback circuit of a half-bridge quasi-resonant circuit according to a first embodiment of the present invention;
fig. 4 is a block diagram of a control circuit of a backlight according to a second embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a schematic structural diagram of a control circuit of a backlight according to a first embodiment of the present invention; the circuit may be integrated into a display terminal having a backlight, and the circuit may be used to adjust the brightness of the backlight. As shown in fig. 1, the control circuit of the backlight specifically includes: micro-control chip 110, backlight driving chip 120, half-bridge quasi-resonant circuit 130 and backlight source 140.
The backlight driving chip 120 is respectively connected to the micro-control chip 110, the backlight source 140 and the half-bridge quasi-resonant circuit 130, and the half-bridge quasi-resonant circuit 130 is further connected to the backlight source 140.
The backlight driving chip 120 is configured to obtain a backlight control signal sent by the micro-control chip 110, generate a voltage adjustment signal corresponding to each area in the backlight source according to the backlight control signal and by detecting a driving current of the backlight source, and send the voltage adjustment signal to the half-bridge quasi-resonant circuit 130; the half-bridge quasi-resonant circuit 130 is connected to the backlight driving chip 120, and is configured to obtain the voltage adjustment signal and adjust a supply voltage of the backlight source region according to the voltage adjustment signal; the backlight source 140 is connected to the half-bridge quasi-resonant circuit 130, and is used for adjusting the brightness of the backlight source region according to the supply voltage.
Illustratively, the display terminal may be a liquid crystal television, or may be other display devices such as a public billboard or an automobile display with a backlight source. The backlight source is preferably an LED lamp, and in actual operation, the backlight source can be divided into N backlight source areas. After a System On Chip (SOC) collects a video image signal, the image data can be sent to the micro control Chip through an SPI interface of the micro control Chip. And after receiving the image data, the micro control chip decodes each frame of video image and obtains brightness information corresponding to each backlight source area. Because the power supply voltage and the preset current value of the backlight source corresponding to different brightness information are different, the brightness of the corresponding backlight source can be adjusted by adjusting the power supply voltage of the backlight source, and the purposes of saving energy and enhancing image quality can be achieved.
The model of the micro control chip 110 (hereinafter referred to as MCU) is preferably MSP430G series. The MISI-A interface of the MCU is used for transmitting signals, and the MISO-A interface is used for receiving signals. The MCU processes the image data and then sends the backlight control signal to the backlight driver chip 120 through the MISI-a interface.
Specifically, the MCU may receive the luminance data sent by the SOC and send a backlight control signal to the backlight driver chip through the following three functions to implement a real-time luminance refresh function:
system _ power _ on _ day _ chain (); IW7027 initialization function
# pragma VECTOR ═ uscab 0RX _ VECTOR __ interrupt void USCI0RX _ ISR (); receiving data
Update _256_ Zones _ All _ bright (); refreshing brightness
Illustratively, the model of the backlight driving chip 120 is preferably IW 7027. Fig. 2 is a circuit diagram of a control circuit of a backlight driving chip according to an embodiment of the present invention. Since the backlight driver chip is connected to the backlight source, the backlight driver chip 120 can determine the driving current of the backlight source at the current moment after receiving the backlight control signal (here, mainly controlling the driving current of the backlight source to be kept in a constant current range) sent by the micro controller chip 110. As shown in FIG. 2, the backlight driving chip 120 can feed back the detected actual operation current of the backlight source region to the micro-controller chip 110 through the pins S1-S16 (each channel in S1-S16 corresponds to a string of LED lamps). Since each backlight source area corresponding to the picture content in the display screen has a preset current value, if the backlight driving chip 120 detects that the actual operating current of a certain backlight source area a is smaller than the corresponding preset current value, the current with the minimum current amplitude is selected as the target adjustment current from the currents fed back by each channel of the backlight driving chip 120 connected to the LED lamps in the backlight source area a, and a voltage adjustment signal is sent to the half-bridge quasi-resonant circuit 130 through the FB pin as shown in fig. 2.
Illustratively, the model of the pulse frequency modulation controller in the half-bridge quasi-resonant circuit 130 is preferably FAN 7631. After receiving the voltage adjustment signal sent by the backlight driving chip 120, the half-bridge quasi-resonant circuit 130 may generate power supply voltages corresponding to different backlight areas based on its own feedback circuit. Because the half-bridge quasi-resonant circuit 130 is directly connected with the backlight 140, the supply voltage in the backlight area can be directly adjusted, and compared with a mode of adjusting the supply voltage in the backlight area through a plurality of DC-DC modules in the prior art, the voltage adjustment mode provided by the scheme has higher efficiency and smaller energy consumption, and simultaneously, the material cost of the PCB is also saved.
Fig. 3 is a schematic diagram of a feedback circuit of a half-bridge quasi-resonant circuit according to an embodiment of the present invention. As shown in fig. 3, an input end of the feedback circuit is connected to an FB pin of the backlight control chip 120, and a voltage value corresponding to the target adjustment current can be input to the feedback circuit through the FB pin, so that the half-bridge quasi-resonant circuit can output an adjusted supply voltage of the backlight source. For the backlight source region that needs to be adjusted currently, since the current amplitude of the target adjustment current is the smallest in the S1-S16 channels of the backlight driving chip 120, the supply voltage of the backlight source region needs to be increased currently through the half-bridge quasi-resonant circuit 130. Meanwhile, because the FB pin of the backlight driving chip outputs a linearly changing voltage value, the half-bridge quasi-resonant circuit can control the supply voltage of the backlight source in real time according to the linearly changing voltage value.
Specifically, for example, when a part of a scene in the display screen changes from dark to light, the current of the backlight source region corresponding to the part of the scene also increases because the brightness of the scene is switched from dark to light. And because the supply voltage of the backlight source region can not change suddenly, the backlight driving chip can send the voltage adjusting signal corresponding to the backlight source region to the half-bridge quasi-resonant circuit, and the feedback circuit in the half-bridge quasi-resonant circuit can raise the supply voltage of the backlight source region after receiving the voltage adjusting signal, so that the brightness of the backlight source is increased, and the brightness of a display picture is enhanced.
Further, the half-bridge quasi-resonant circuit 130 includes an overcurrent protection device (OCP), and when the driving current of the backlight is greater than the rated current, the half-bridge quasi-resonant circuit 130 will automatically power off, thereby protecting the backlight from being damaged.
This embodiment provides a control circuit of backlight, control circuit includes: the backlight driving chip is used for receiving a backlight control signal sent by the micro-control chip, generating a voltage adjusting signal corresponding to each area in the backlight source according to the backlight control signal and by detecting the driving current of the backlight source, and sending the voltage adjusting signal to the half-bridge quasi-resonant circuit; the half-bridge quasi-resonant circuit is used for adjusting the power supply voltage of each area in the backlight source according to the voltage adjusting signal. By adopting the technical scheme, the brightness of the backlight source can be adjusted in real time according to the content displayed on the screen. Because the feedback circuit in the half-bridge quasi-resonant circuit is used for replacing a plurality of DC-DC modules to adjust the power supply voltage of the backlight source, the material cost can be saved, and the effect of reducing the energy consumption of the display terminal can be achieved.
Example two
Fig. 4 is a block diagram of a control circuit of a backlight according to a second embodiment of the present invention. In this embodiment, a refinement is made on the basis of the above embodiment, as shown in fig. 4, the control circuit of the backlight includes: a filter circuit 210, a power factor correction circuit 220, a micro-control chip 230, a backlight driving chip 240, a half-bridge quasi-resonant circuit 250 and a backlight 260. Wherein,
the input end of the filter circuit 210 is connected to a power grid, and the output end is connected to the power factor correction circuit 220, and is used for filtering out electromagnetic interference signals in the control circuit; the output terminal of the pfc circuit 220 is connected to the input terminal of the half-bridge quasi-resonant circuit 250, and is configured to perform pfc and regulation on the filtered voltage signal, so as to improve the power factor of the control circuit. The backlight driving chip 240 is respectively connected to the micro-control chip 230, the backlight source 260 and the half-bridge quasi-resonant circuit 250, and the half-bridge quasi-resonant circuit 250 is further connected to the backlight source 260.
The backlight driving chip 240 is configured to obtain a backlight control signal sent by the micro-control chip 230, generate a voltage adjustment signal corresponding to each area in the backlight source according to the backlight control signal and by detecting a driving current of the backlight source, and send the voltage adjustment signal to the half-bridge quasi-resonant circuit 250; the half-bridge quasi-resonant circuit 250 is connected to the backlight driving chip 240, and is configured to obtain the voltage adjustment signal and adjust a supply voltage of the backlight source region according to the voltage adjustment signal; and the backlight source 260 is connected with the half-bridge quasi-resonant circuit 250 and used for adjusting the brightness of the backlight source area according to the power supply voltage.
Illustratively, the filter circuit 210 is preferably an EMC (Electro Magnetic Compatibility) filter circuit.
Further, the control circuit of the backlight source further includes a first diode D1 and a second diode D2, wherein, as shown in fig. 3, an anode of the first diode D1 is connected to a cathode of the second diode D2; the cathode of the first diode D1 is connected to the feedback pin FB of the backlight driving chip 240; the anode of the second diode D2 is connected to the feedback circuit of the half-bridge quasi-resonant circuit 250.
For example, the first diode D1 and the second diode D2 play a role of isolating current in the control circuit of the backlight source, that is, currents in different backlight source areas all flow to the backlight driver chips connected to the backlight driver chips, and a phenomenon of mutually sinking current is avoided, so that a plurality of backlight driver chips can be simultaneously connected in parallel for use.
Further, the backlight driving chip 240 may also modulate different Pulse Width Modulation (PWM) signals corresponding to different backlight source regions according to the backlight control signal sent by the micro-control chip 230. If the actual working current of a certain backlight area is greater than the corresponding preset current value, the backlight driving chip 240 reduces the duty ratio of the pulse width adjustment signal corresponding to the backlight area, so as to reduce the actual working current of the backlight area, and the displayed brightness becomes dark for the display picture. Accordingly, if the brightness of the display screen is changed, the supply voltage corresponding to the backlight source region can be increased through the half-bridge quasi-resonant circuit.
In conclusion, through adopting the embodiment of the utility model provides a control circuit of backlight, the backlight can be according to the supply voltage that half-bridge quasi-resonant circuit sent and the pulse width modulation signal that the drive chip that is shaded sent combine to adjust the regional luminance of backlight, and then can make the regional luminance of backlight change along with the change of the luminance of display screen, make the luminance value in bright region can reach the biggest in the display screen, the luminance in dark region falls to minimumly simultaneously, even close, and then can reach the best contrast, the effect of Local Dimming regulation has been realized.
Further, the control circuit further includes: and the overvoltage protection circuit (OVP) is connected with the half-bridge quasi-resonant circuit and is used for controlling the half-bridge quasi-resonant circuit to be disconnected when the power supply voltage reaches the maximum value of the preset voltage.
The embodiment provides a control circuit of a backlight source, and on the basis of reducing cost and achieving the effect of accurately adjusting local backlight, isolation diodes D1 and D2, an EMC filter circuit and a power factor correction circuit are added. Through the isolation diodes, a plurality of backlight driving chips can be used in parallel, and the utilization rate of the backlight driving chips is improved; electromagnetic interference signals in the backlight source control circuit can be filtered through the EMC filter circuit, the power factor of the half-bridge quasi-resonant circuit is improved through the power factor correction circuit, and the working efficiency of the backlight source control circuit is further improved.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (7)
1. A control circuit of a backlight source is applied to a display terminal, the display terminal is provided with the backlight source, and the control circuit is characterized by comprising: a micro-control chip, a backlight driving chip and a half-bridge quasi-resonant circuit, wherein the backlight driving chip is respectively connected with the micro-control chip, a backlight source and the half-bridge quasi-resonant circuit, the half-bridge quasi-resonant circuit is also connected with the backlight source, wherein,
the backlight driving chip is used for receiving a backlight control signal sent by the micro-control chip, generating a voltage adjusting signal corresponding to each area in the backlight source according to the backlight control signal and by detecting the driving current of the backlight source, and sending the voltage adjusting signal to the half-bridge quasi-resonant circuit;
the half-bridge quasi-resonant circuit is used for adjusting the power supply voltage of each area in the backlight source according to the voltage adjusting signal.
2. The circuit of claim 1, wherein the control circuit further comprises: a first diode and a second diode, wherein,
the anode of the first diode is connected with the cathode of the second diode;
the cathode of the first diode is connected with a feedback pin of the backlight driving chip;
and the anode of the second diode is connected with the half-bridge quasi-resonant circuit.
3. The circuit of claim 1, wherein the control circuit further comprises: a filter circuit and a power factor correction circuit, wherein,
the input end of the filter circuit is connected with a power grid, and the output end of the filter circuit is connected with the power factor correction circuit and used for filtering electromagnetic interference signals in the control circuit;
and the output end of the power factor correction circuit is connected with the input end of the half-bridge quasi-resonant circuit and is used for carrying out power factor correction and adjustment on the filtered voltage signal so as to improve the power factor of the control circuit.
4. The circuit of claim 3, wherein the control circuit further comprises:
and the overvoltage protection circuit is connected with the half-bridge quasi-resonant circuit and used for controlling the half-bridge quasi-resonant circuit to be disconnected when the power supply voltage reaches the maximum value of the preset voltage.
5. The circuit of claim 1, wherein:
the micro-control chip is MSP430G series.
6. The circuit of claim 1, wherein:
the model of the backlight driving chip is IW 7027.
7. A display terminal comprising a backlight, characterized in that the display terminal further comprises at least a control circuit of the backlight as claimed in any one of claims 1 to 6.
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| CN201720446586.3U CN206864163U (en) | 2017-04-26 | 2017-04-26 | The control circuit and display terminal of a kind of backlight |
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| CN201720446586.3U CN206864163U (en) | 2017-04-26 | 2017-04-26 | The control circuit and display terminal of a kind of backlight |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113223466A (en) * | 2021-04-27 | 2021-08-06 | 广东小天才科技有限公司 | Display screen brightness correction method and device and electronic equipment |
| CN114023273A (en) * | 2021-11-22 | 2022-02-08 | 深圳创维－Rgb电子有限公司 | Local dimming driving circuit, method and system and electronic equipment |
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2017
- 2017-04-26 CN CN201720446586.3U patent/CN206864163U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113223466A (en) * | 2021-04-27 | 2021-08-06 | 广东小天才科技有限公司 | Display screen brightness correction method and device and electronic equipment |
| CN113223466B (en) * | 2021-04-27 | 2022-05-17 | 广东小天才科技有限公司 | Display screen brightness correction method and device and electronic equipment |
| CN114023273A (en) * | 2021-11-22 | 2022-02-08 | 深圳创维－Rgb电子有限公司 | Local dimming driving circuit, method and system and electronic equipment |
| CN114023273B (en) * | 2021-11-22 | 2023-03-21 | 深圳创维－Rgb电子有限公司 | Local dimming driving circuit, method and system and electronic equipment |
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