CN111223461B - Voltage regulating circuit and display device - Google Patents

Voltage regulating circuit and display device Download PDF

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Publication number
CN111223461B
CN111223461B CN202010049521.1A CN202010049521A CN111223461B CN 111223461 B CN111223461 B CN 111223461B CN 202010049521 A CN202010049521 A CN 202010049521A CN 111223461 B CN111223461 B CN 111223461B
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voltage
module
picture
source driver
power supply
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CN111223461A (en
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魏玉娜
沈振天
徐福根
刘晓杏
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InfoVision Optoelectronics Kunshan Co Ltd
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InfoVision Optoelectronics Kunshan Co Ltd
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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
    • G09G3/36—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 using liquid crystals
    • 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
    • G09G3/36—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 using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3696—Generation of voltages supplied to electrode drivers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

The invention relates to the field of display, and provides a voltage regulating circuit and a display device. The judging module is used for judging the picture type of the picture; the power supply module is respectively connected with the source driver and the judging module, and outputs a power supply voltage to the source driver according to the picture types, so that the source driver generates corresponding internal voltages, wherein different picture types correspond to different power supply voltages. The voltage regulating circuit and the display device can regulate the power supply voltage received by the source driver according to the picture type, so that the phenomenon that the picture is abnormal due to insufficient internal voltage of the source driver when the display picture is a heavy-duty picture under the condition of large wiring impedance is avoided, and compared with the condition that the power supply voltage is set to be higher fixed voltage, the voltage regulating circuit and the display device are more reasonable and more power-saving.

Description

Voltage regulating circuit and display device
Technical Field
The present invention relates to the field of display, and in particular, to a voltage regulating circuit and a display device.
Background
The liquid crystal display device (Liquid Crystal Display, LCD) has many advantages of light weight, energy saving, no radiation, etc., and thus has gradually replaced the conventional Cathode Ray Tube (CRT) display. Currently, liquid crystal displays are widely used in electronic devices such as high-definition digital televisions, desktop computers, personal Digital Assistants (PDAs), notebook computers, mobile phones, digital cameras, and the like.
However, when the display device displays a screen, if the display screen is a heavy screen, the load is maximum and the power consumption of the current screen is maximum, and when the wiring impedance is large, the internal voltage of the source driver is insufficient, so that the source driver works abnormally, and the screen display is abnormal. In this regard, the existing solution is to make the power supply voltage received by the source driver be a higher fixed voltage, so that the source driver can generate a higher internal voltage to meet the normal operating requirement of the circuit. However, this solution makes the received power supply voltage the same for the screen displayed by the display device whether it is a heavy-load screen, a normal screen or a light-load screen, and thus the display device will generate greater power consumption when displaying the normal screen and the light-load screen.
Disclosure of Invention
Accordingly, the present invention is directed to a voltage regulating circuit and a display device, which can regulate the magnitude of the power supply voltage received by the source driver according to the picture type, so as to avoid the abnormal picture caused by insufficient internal voltage of the source driver when the wiring impedance is high and the display picture is a heavy-load picture.
The embodiment of the invention provides a voltage regulating circuit, which comprises a judging module and a power supply module; the judging module is used for judging the picture type of the picture; the power supply module is respectively connected with the source driver and the judging module, and outputs power supply voltage to the source driver according to the picture types, so that the source driver generates corresponding internal voltage, wherein different picture types correspond to different power supply voltages.
Further, the picture types include a heavy load picture, a normal picture, and a light load picture.
Further, the determination module is disposed in the timing controller to receive an image data signal through the timing controller and determine the picture type according to the image data signal.
Further, the judging module comprises a feedback comparing unit, the feedback comparing unit detects the driving voltage of the source driver to obtain a detection current, the detection current is compared with a first current threshold to obtain a first judging output signal, the detection current is compared with a second current threshold to obtain a second judging output signal, and the judging module judges the picture type according to the first judging output signal and the second judging output signal.
Further, the judging module further comprises an encoding control unit, the encoding control unit is connected with the feedback comparison unit and generates corresponding state numbers according to the first judging output signal and the second judging output signal, then the state numbers are output to the power supply module, and the power supply module outputs different power supply voltages according to different state numbers.
Further, the determination module further includes a first port and a second port, the first port receives the first determination output signal, the second port receives the second determination output signal, and the encoding control unit generates the state number according to a high-low level state of the first determination output signal received by the first port and a high-low level state of the second determination output signal received by the second port.
Further, the feedback comparison unit is disposed in the source driver, and the encoding control unit is disposed in the timing controller.
Further, the voltage regulating circuit comprises a voltage detection comparison module, the voltage detection comparison module is respectively connected with the source driver and the power supply module, the voltage detection comparison module detects the internal voltage and compares the internal voltage with a threshold voltage, and when the internal voltage is smaller than the threshold voltage, the power supply module increases the power supply voltage.
Further, the voltage detection comparison module generates a corresponding state number when the internal voltage is compared with the threshold voltage, and the power supply module receives the state number and increases the power supply voltage when the internal voltage is determined to be smaller than the threshold voltage according to the corresponding state number.
The embodiment of the invention also provides a display device which comprises the voltage regulating circuit.
The voltage regulating circuit and the display device can regulate the power supply voltage received by the source driver according to the picture type, avoid the phenomenon that the picture is abnormal due to insufficient internal voltage of the source driver when the display picture is a heavy-duty picture under the condition of larger wiring impedance, and are more reasonable and more power-saving compared with the mode that the power supply voltage is set to be higher fixed voltage.
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings.
Drawings
Fig. 1 is a schematic diagram of a voltage regulating circuit according to a first embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a voltage regulating circuit according to a second embodiment of the present invention.
Fig. 3 is a schematic circuit diagram of a voltage regulating circuit according to a third embodiment of the present invention.
Fig. 4 is a schematic diagram illustrating a voltage regulating circuit according to a third embodiment of the present invention.
Fig. 5 is a schematic diagram illustrating the operation of a decision module of a voltage regulating circuit according to a third embodiment of the present invention.
Detailed Description
In order to further describe the technical means and effects adopted by the present invention to achieve the intended purpose, the following detailed description refers to the specific implementation, method, steps, structure, features and effects of the voltage regulating circuit and the display device according to the present invention with reference to the accompanying drawings and preferred embodiments.
The foregoing and other features, aspects, and advantages of the present invention will become more apparent from the following detailed description of the preferred embodiments, which proceeds with reference to the accompanying drawings. While the invention may be susceptible to further details of embodiments and examples of means and effects for achieving the desired purpose, the drawings are provided for the purpose of reference and illustration only and are not intended to be limiting.
First embodiment
Referring to fig. 1, fig. 1 is a schematic diagram illustrating a voltage regulating circuit according to a first embodiment of the invention. As shown in fig. 1, the voltage regulating circuit includes a decision module 110 and a power module 120. The judging module 110 is used for judging the picture type of the picture; the power module 120 is connected to the source driver 200 and the determination module 110, and the source driver outputs a supply voltage XVCC to the source driver 200 according to a frame type, so that the source driver 200 generates a corresponding internal voltage V0, wherein different frame types correspond to different supply voltages XVCC.
Specifically, the voltage regulating circuit of the present embodiment includes a determining module 110 and a power module 120, the determining module 110 determines the picture type of the picture, the power module 120 outputs a corresponding supply voltage XVCC to the source driver 200 according to the picture type, and the source driver 200 receives the corresponding supply voltage XVCC and generates a corresponding internal voltage V0 to regenerate a driving voltage Vin to the display panel 300. In an embodiment, the frame types may be, for example, heavy-duty frames, normal frames and light-duty frames, where the load of the display panel 300 is different when the display panel 300 displays frames with different frame types, for example, the load is the largest when the display frame is a heavy-duty frame; when the display picture is a common picture, the load is small; when the display picture is a light-load picture, the load is minimum. Meanwhile, the larger the load of the display panel 300, the larger the driving voltage provided by the source driver 200 is required, and under the condition of larger routing impedance, a larger voltage drop will be generated when more current passes through the routing, and if the power supply voltage XVCC received by the source driver 200 is unchanged, the internal voltage V0 of the source driver 200 will be insufficient. In this embodiment, the power module 120 obtains the picture type through the determination module 110, and can provide the power supply voltage XVCC corresponding to the picture type to the source driver 200, so that when the load of the display panel 300 increases due to displaying the picture of the corresponding picture type, the source driver 200 can correspondingly receive the increased power supply voltage XVCC provided by the power module 120, so that the source driver 200 can always generate the internal voltage V0 meeting the working requirement, and abnormal picture caused by insufficient internal voltage V0 of the source driver 200 under the condition of large wiring impedance is avoided.
In an embodiment, the voltage regulating circuit may include a voltage detection and comparison module 130, where the voltage detection and comparison module 130 is connected to the source driver 200 and the power module 120, respectively, the voltage detection and comparison module 130 detects an internal voltage V0 and compares the internal voltage V0 with a threshold voltage VS, and when the internal voltage V0 is less than the threshold voltage VS, the power module 120 increases the supply voltage XVCC. In an embodiment, the power module 120 may be preset with a voltage shift table, for example, the higher the voltage shift is, the larger the corresponding power supply voltage XVCC is, when the internal voltage V0 is smaller than the threshold voltage VS, the power module 120 may adjust the voltage shift to increase the power supply voltage XVCC, for example, the higher the voltage shift is, the larger the power supply voltage XVCC is, so that the source driver 200 may generate the internal voltage V0 meeting the working requirement, and abnormal images caused by insufficient internal voltage V0 of the source driver 200 under the condition of high routing impedance are avoided.
In one embodiment, the voltage detection comparison module 130 generates a corresponding state number when the internal voltage V0 is compared with the threshold voltage VS, and the power module 120 receives the state number and increases the supply voltage XVCC when the internal voltage V0 is determined to be less than the threshold voltage VS according to the corresponding state number. For example, when the voltage detection comparison module 130 detects that the internal voltage V0 is greater than the threshold voltage VS, a corresponding state number of 0 may be generated, the power module 120 receives the state number of 0 and maintains the operating state, when the voltage detection comparison module 130 detects that the internal voltage V0 is less than the threshold voltage VS, a corresponding state number of 1 may be generated, and the power module 120 receives the state number of 1 and increases the supply voltage XVCC accordingly, for example, increases the first gear voltage.
The voltage regulating circuit provided by the embodiment can regulate the power supply voltage XVCC received by the source driver according to the picture type, so that the phenomenon that the picture is abnormal due to insufficient internal voltage V0 of the source driver when the picture is a heavy-duty picture under the condition of large wiring impedance is avoided, and compared with the condition that the power supply voltage XVCC is set to be higher fixed voltage, the voltage regulating circuit is more reasonable and saves power consumption.
Second embodiment
Fig. 2 is a schematic circuit diagram of a voltage regulating circuit according to a second embodiment of the present invention. As shown in fig. 2, the voltage regulating circuit of the present embodiment is substantially the same as the circuit structure of the voltage regulating circuit of the first embodiment, and the determining module 110 of the present embodiment is disposed in the timing controller 400 to receive the image data signal through the timing controller 400 and determine the picture type according to the image data signal.
Specifically, in this embodiment, the determining module 110 is disposed in the timing controller 400, the timing controller 400 is configured to receive an externally input image data signal, process and convert the image data signal to input the image data signal to the source driver 200, and generate a clock signal required for timing control, so that the determining module 110 may first receive the image data signal through the timing controller 400, determine a picture type of a picture according to the image data signal, and the power module 120 outputs a corresponding power supply voltage XVCC to the source driver 200 according to the picture type, and the source driver 200 receives the corresponding power supply voltage XVCC and generates a corresponding internal voltage V0. In an embodiment, the frame types may be, for example, heavy-duty frames, normal frames and light-duty frames, where the load of the display panel 300 is different when the display panel 300 displays frames with different frame types, for example, the load is the largest when the display frame is a heavy-duty frame; when the display picture is a common picture, the load is small; when the display picture is a light-load picture, the load is minimum. Meanwhile, the larger the load of the display panel 300, the larger the driving voltage provided by the source driver 200 is required, and under the condition of larger routing impedance, a larger voltage drop will be generated when more current passes through the routing, and if the power supply voltage XVCC received by the source driver 200 is unchanged, the internal voltage V0 of the source driver 200 will be insufficient. In this embodiment, the determination module 110 is disposed in the timing controller 400, so as to receive the image data signal through the timing controller 400 and determine the picture type according to the image data signal, the power module 120 obtains the picture type through the determination module 110, and can provide the power supply voltage XVCC corresponding to the picture type to the source driver 200, for example, when the determination module 110 determines that the picture type is a heavy-duty picture, the power module 120 adjusts the power supply voltage XVCC to be 2.0V; when the judging module 110 judges that the picture type is the common picture, the power module 120 adjusts the power supply voltage XVCC to be 1.9V; when the determination module 110 determines that the frame type is a light-load frame, the power module 120 adjusts the power supply voltage XVCC to be 1.8V. Accordingly, when the load increases due to the display panel 300 displaying a picture of a corresponding picture type, the source driver 200 can correspondingly receive the increased power supply voltage XVCC provided by the power module 120, so that the source driver 200 can always generate the internal voltage V0 meeting the working requirement, and abnormal pictures caused by insufficient internal voltage V0 of the source driver 200 under the condition of large wiring impedance are avoided.
In an embodiment, the voltage regulating circuit includes a voltage detection comparison module 130, the voltage detection comparison module 130 is respectively connected to the source driver 200 and the power module 120, the voltage detection comparison module 130 detects an internal voltage V0 to determine the internal voltage V0, and compares the internal voltage V0 with a threshold voltage VS, and when the internal voltage V0 is less than the threshold voltage VS, the power module 120 increases the supply voltage XVCC. And in one embodiment, the threshold voltage VS may be provided by the power module 120.
According to the voltage regulating circuit provided by the embodiment, the judging module can judge the picture type through the image data signals received by the time sequence control circuit, the power supply module adjusts the power supply voltage XVCC received by the source driver according to the picture type, and the phenomenon that when the display picture is a heavy-load picture under the condition of large wiring impedance, the picture is abnormal due to insufficient internal voltage V0 of the source driver is avoided, and compared with the situation that the power supply voltage XVCC is set to be higher fixed voltage, the voltage regulating circuit is more reasonable and saves more power consumption.
Third embodiment
This embodiment is described with reference to fig. 3 to 5. Fig. 3 is a schematic circuit diagram of a voltage regulating circuit according to a third embodiment of the present invention, fig. 4 is a specific operation schematic diagram of the voltage regulating circuit according to the third embodiment of the present invention, and fig. 5 is a schematic operation schematic diagram of a determination module of the voltage regulating circuit according to the third embodiment of the present invention. The voltage regulating circuit of the present embodiment is substantially the same as the circuit structure of the voltage regulating circuit of the first embodiment, and the determining module 110 of the present embodiment includes a feedback comparing unit 111, the feedback comparing unit 111 detects the driving voltage Vin of the source driver 200 to obtain a detected current Iin, compares the detected current Iin with a first current threshold I1 to obtain a first determining output signal, and compares the detected current Iin with a second current threshold I2 to obtain a second determining output signal, and the determining module 110 determines the picture type according to the first determining output signal and the second determining output signal.
Specifically, in this embodiment, as shown in fig. 3, the determining module 110 includes a feedback comparing unit 111, the feedback comparing unit 111 detects the driving voltage Vin of the source driver 200 to obtain a detected current Iin, and as shown in fig. 4, the feedback comparing unit 111 compares the detected current Iin with a first current threshold I1 to obtain a first determination output signal, compares the detected current Iin with a second current threshold I2 to obtain a second determination output signal, and the determining module 110 determines the picture type according to the first determination output signal and the second determination output signal, and determines the picture type of the picture according to the image data signal. For example, the determining module 110 may determine that the frame type is a light-load frame when determining that the detected current Iin is smaller than the first current threshold I1 according to the first determination output signal and the second determination output signal obtained by the feedback comparing unit 111; when the detected current Iin is determined to be larger than the first current threshold I1 and the detected current Iin is determined to be smaller than the second current threshold I2, the picture type can be judged to be a common picture; upon determining that the detected current Iin is greater than the second current threshold I2, it may be determined that the picture type is a heavy-duty picture. Then, the power module 120 outputs a corresponding supply voltage XVCC to the source driver 200 according to the picture type, and the source driver 200 receives the corresponding supply voltage XVCC and generates a corresponding internal voltage V0. Accordingly, when the load increases due to the display panel 300 displaying a picture of a corresponding picture type, the source driver 200 can correspondingly receive the increased power supply voltage XVCC provided by the power module 120, so that the source driver 200 can always generate the internal voltage V0 meeting the working requirement, and abnormal pictures caused by insufficient internal voltage V0 of the source driver 200 under the condition of large wiring impedance are avoided.
In an embodiment, the determining module 110 may further include a coding control unit 112, where the coding control unit 112 is connected to the feedback comparing unit 111 and generates a corresponding state number according to the first determining output signal and the second determining output signal, and then outputs the state number to the power module 120, and the power module 120 outputs different power supply voltages XVCC according to different state numbers. Wherein the first current threshold may be less than the second current threshold. Specifically, as shown in fig. 4, the determining module 110 may determine that the picture type is a light-load picture when determining that the detected current Iin is smaller than the first current threshold I1 according to the first determining output signal and the second determining output signal obtained by the feedback comparing unit 111, and the encoding control unit 112 generates a corresponding state number of 00; when it is determined that the detected current Iin is greater than the first current threshold I1 and the detected current Iin is less than the second current threshold I2, it may be determined that the picture type is a normal picture, and the encoding control unit 112 generates a corresponding state number of 10; upon determining that the detected current Iin is greater than the second current threshold I2, it may be determined that the picture type is a heavy picture, and the encoding control unit 112 generates a corresponding state number of 11. Then, the determining module 110 may send the generated state number to the power module 120, where the power module 120 outputs a corresponding power supply voltage XVCC to the source driver 200 according to the corresponding state number, for example, the power module 120 adjusts the power supply voltage XVCC to 2.0V according to the received state number of 11; the power module 120 adjusts the power supply voltage XVCC to 1.9V according to the received status number of 10; the power module 120 adjusts the supply voltage XVCC to 1.8V according to the received status number of 00.
In an embodiment, the determining module 110 may further include a first port TGPIO1 and a second port TGPIO2, where the first port TGPIO1 receives the first determination output signal, the second port TGPIO2 receives the second determination output signal, and the encoding control unit 112 generates the state number according to the high-low level state of the first determination output signal received by the first port TGPIO1 and the high-low level state of the second determination output signal received by the second port TGPIO 2. Specifically, as shown in fig. 5, the first port TGPIO1 receives the first determination output signal, the second port TGPIO2 receives the second determination output signal, when the detected current Iin is smaller than the first current threshold I1, the determination module 110 may determine that the picture type is a light-load picture, the first determination output signal received by the first port TGPIO1 is at a low level, and the second determination output signal received by the second port TGPIO2 is at a low level, and the encoding control unit 112 correspondingly generates a state number of 00 and outputs the state number to the power module 120; when the detected current Iin is greater than the first current threshold I1 and the detected current Iin is less than the second current threshold I2, the determining module 110 may determine that the picture type is a normal picture, the first determination output signal received by the first port TGPIO1 is at a high level and the second determination output signal received by the second port TGPIO2 is at a low level, and the encoding control unit 112 correspondingly generates a state number of 10 and outputs the state number to the power module 120; when determining that the detected current Iin is greater than the second current threshold I2, the determining module 110 may determine that the picture type is a reload picture, the first determining output signal received by the first port TGPIO1 is at a high level, and the second determining output signal received by the second port TGPIO2 is at a high level, and the encoding control unit 112 generates a state number of 11 accordingly and outputs the state number to the power module 120. Then, the power module 120 may output the corresponding power supply voltage XVCC to the source driver 200 according to the corresponding state number.
In an embodiment, the feedback comparing unit 111 may be disposed in the source driver 200, and the encoding control unit 112 may be disposed in the timing controller 400.
In an embodiment, the voltage regulating circuit includes a voltage detection comparison module 130, the voltage detection comparison module 130 is respectively connected to the source driver 200 and the power module 120, the voltage detection comparison module 130 detects an internal voltage V0 to determine the internal voltage V0, and compares the internal voltage V0 with a threshold voltage VS, and when the internal voltage V0 is less than the threshold voltage VS, the power module 120 increases the supply voltage XVCC. And in one embodiment, the threshold voltage VS may be provided by the power module 120.
According to the voltage regulating circuit provided by the embodiment, the judging module can judge the picture type by detecting the magnitude of the detection current Iin obtained by the driving voltage Vin of the source driver through the feedback comparison unit, and the power module adjusts the magnitude of the power supply voltage XVCC received by the source driver according to the picture type, so that abnormal pictures caused by insufficient internal voltage V0 of the source driver when the pictures are displayed as heavy-load pictures under the condition of large wiring impedance are avoided, and compared with the situation that the power supply voltage XVCC is set to be higher fixed voltage, the voltage regulating circuit is more reasonable and saves power consumption.
Fourth embodiment
Based on the same inventive concept, the embodiment of the present invention further provides a display device, which includes the voltage regulating circuit provided in any one of the embodiments, and the implementation of the display device may refer to the embodiment of the voltage regulating circuit, and the repetition is not repeated.
According to the display device provided by the embodiment, the size of the power supply voltage XVCC received by the source driver can be adjusted according to the picture type, so that abnormal pictures caused by insufficient internal voltage V0 of the source driver when the display picture is a heavy-duty picture under the condition of large wiring impedance can be avoided, and compared with the situation that the power supply voltage XVCC is set to be higher fixed voltage, the display device is more reasonable and saves more power consumption.
The present invention is not limited to the above embodiments, but is capable of modification and variation in all aspects, including the following description, but not limited to, various modifications and equivalents, which will be apparent to those skilled in the art, without departing from the scope of the present invention.

Claims (6)

1. A voltage regulating circuit, comprising:
a determination module (110), wherein the determination module (110) is configured to determine a picture type of a picture, the picture type including a heavy-load picture, a normal picture, and a light-load picture; the judging module (110) is arranged in the time schedule controller (400) to receive image data signals through the time schedule controller (400) and judge the picture type according to the image data signals; or, the judging module (110) includes a feedback comparing unit (111), the feedback comparing unit (111) detects a driving voltage of the source driver (200) to obtain a detected current, compares the detected current with a first current threshold to obtain a first judging output signal, and compares the detected current with a second current threshold to obtain a second judging output signal, and the judging module (110) judges the picture type according to the first judging output signal and the second judging output signal;
the power module (120), the said power module (120) couples to source driver (200) and said judgement module (110) separately, the said power module (120) outputs different supply voltage to the said source driver (200) directly according to the said picture type, in order to make the said source driver (200) receive different said supply voltage and produce the corresponding internal voltage, regenerate the drive voltage to display panel (300); the power supply voltage corresponding to the common picture is larger than the power supply voltage corresponding to the light-load picture and smaller than the power supply voltage corresponding to the heavy-load picture;
a voltage detection comparison module (130), wherein the voltage detection comparison module (130) is respectively connected with the source driver (200) and the power supply module (120), the voltage detection comparison module (130) detects the internal voltage and compares the internal voltage with a threshold voltage, and when the internal voltage is smaller than the threshold voltage, the power supply module (120) increases the power supply voltage corresponding to the picture type; when the internal voltage is greater than the threshold voltage, the power supply module (120) maintains the supply voltage corresponding to the picture type.
2. The voltage regulating circuit according to claim 1, wherein the determining module (110) further comprises a coding control unit (112), the coding control unit (112) is connected to the feedback comparing unit (111) and generates a corresponding state number according to the first determining output signal and the second determining output signal, and outputs the state number to the power module (120), and the power module (120) outputs different power supply voltages according to different state numbers.
3. The voltage regulating circuit of claim 2, wherein the determination module (110) further comprises a first port and a second port, the first port receiving the first determination output signal and the second port receiving the second determination output signal, the encoding control unit (112) generating the state number according to a high-low state of the first determination output signal received by the first port and a high-low state of the second determination output signal received by the second port.
4. The voltage regulating circuit according to claim 2, wherein the feedback comparison unit (111) is disposed in the source driver (200), and the encoding control unit (112) is disposed in a timing controller (400).
5. The voltage regulation circuit of claim 1 wherein the voltage detection comparison module (130) generates a corresponding state number when the internal voltage is compared to the threshold voltage, the power module (120) receiving the state number and increasing the supply voltage when the internal voltage is determined to be less than the threshold voltage based on the corresponding state number.
6. A display device comprising the voltage regulating circuit according to any one of claims 1 to 5.
CN202010049521.1A 2020-01-16 2020-01-16 Voltage regulating circuit and display device Active CN111223461B (en)

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