CN112927662B - Driving method and driving circuit of display panel - Google Patents
Driving method and driving circuit of display panel Download PDFInfo
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- CN112927662B CN112927662B CN202110254157.7A CN202110254157A CN112927662B CN 112927662 B CN112927662 B CN 112927662B CN 202110254157 A CN202110254157 A CN 202110254157A CN 112927662 B CN112927662 B CN 112927662B
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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
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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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
- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
- G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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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
- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
- G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3258—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
Abstract
The application discloses a driving method and a driving circuit of a display panel, wherein the driving method comprises the following steps: presetting an output reference voltage; detecting an input voltage of a power supply circuit; comparing the preset multiple of the input voltage with the output reference voltage; outputting a voltage according to the comparison result; wherein the step of controlling the output of the output voltage according to the comparison result comprises: when the preset multiple of the input voltage is greater than the output reference voltage, adjusting the output voltage according to the input voltage; when the preset multiple of the input voltage is less than or equal to the output reference voltage, adjusting the output voltage output according to the output reference voltage; to reduce power consumption.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a driving method and a driving circuit for a display panel.
Background
For the display panel, the gray scale voltage is generally adjusted to display the image with different gray scales; after the display panel receives the picture data, different gray scale voltages are respectively given to different pixels for display. The display panel includes other chips, such as a timing controller, and the gate source driver chip also needs a working voltage to drive; the above voltages are mainly realized by a power management integrated circuit, which is a core part of the power supply for driving the display panel. The power management integrated circuit can realize a plurality of circuit functions, provide working voltage for the time sequence controller, provide reference voltage for the gamma circuit, provide common voltage for the common electrode and the like.
However, for the normal operation of the display panel, the voltage supplied to the chip of the display panel is usually fixed, and the power input is dynamic in practical situations, so that the fixed output causes a large amount of power consumption waste. Therefore, in order to save power consumption, improvement of the power supply circuit is a problem to be solved urgently.
Disclosure of Invention
The application aims to provide a driving method and a driving circuit of a display panel, so as to reduce power consumption.
The application discloses a driving method of a display panel, which comprises the following steps:
presetting an output reference voltage;
detecting the input voltage of a power circuit to obtain a preset multiple of the input voltage of the power circuit;
comparing the preset multiple of the input voltage of the power circuit with the output reference voltage; and
controlling the output of the output voltage of the power supply circuit according to the comparison result;
wherein the step of controlling the output of the output voltage according to the comparison result comprises:
when the preset multiple of the input voltage is larger than the output reference voltage, adjusting the output voltage according to the preset multiple of the input voltage;
when the preset multiple of the input voltage is less than or equal to the output reference voltage, adjusting the output voltage output according to the output reference voltage;
the output reference voltage is a minimum output voltage.
Optionally, when the preset multiple of the input voltage is greater than the output reference voltage, the step of outputting the output voltage corresponding to the input voltage includes the steps of:
when the preset multiple of the input voltage is greater than the output reference voltage;
reading the numerical value of the preset multiple of the input voltage;
adjusting the duty ratio and frequency of an output signal according to the value of the preset multiple of the input voltage, and outputting according to the preset multiple of the input voltage;
when the preset multiple of the input voltage is less than or equal to the output reference voltage, the step of outputting the output reference voltage as the output voltage comprises the following steps:
when the preset multiple of the input voltage is less than or equal to the output reference voltage;
reading the value of the output reference voltage;
and adjusting the duty ratio and the frequency of an output signal by referring to the value of the output reference voltage so as to output the output signal with the output reference voltage.
Optionally, the step of outputting the voltage according to the comparison result includes:
monitoring the output voltage;
and when the output voltage at the current moment is smaller than the output voltage at the last moment, adjusting the duty ratio and the frequency of the output voltage.
Optionally, the step of reading the value of the preset multiple of the input voltage includes:
reading the input voltage;
amplifying a preset multiple;
and obtaining the numerical value of the preset multiple of the input voltage.
Optionally, the step of obtaining the value of the preset multiple of the input voltage includes:
performing digital-to-analog conversion on the input voltage amplified by the preset times to convert the input voltage into digital input voltage;
the preset multiple is 1.1-1.3 times.
The application also discloses a drive circuit of a display panel, including:
the control circuit controls the output voltage output by the boosting circuit; the input end of the booster circuit provides an input voltage; the control circuit includes: the device comprises a detection module, an amplification module, a storage module, a comparison module and a boost converter; the detection module is used for detecting the input voltage; the amplifying module amplifies the input voltage by a preset multiple; the storage module stores a preset output reference voltage; the comparison module respectively receives the input voltage amplified by the amplification module by a preset multiple and a preset output reference voltage of the storage module, and compares the input voltage with the output reference voltage; the boost converter receives the comparison result of the comparison module and controls the output voltage of the boost circuit to be output according to the comparison result;
when the preset multiple of the input voltage is larger than the output reference voltage, adjusting the output voltage according to the preset multiple of the input voltage;
when the preset multiple of the input voltage is less than or equal to the output reference voltage, adjusting the output voltage output according to the output reference voltage; the output reference voltage is a minimum output voltage.
Optionally, the boost circuit is a dc boost circuit, the control circuit is connected to a control end of the dc boost circuit, and the control end controls the output voltage of the dc boost circuit by adjusting the duty ratio and the frequency.
Optionally, the detection module includes: and one end of the sampling resistor is connected to the input voltage, and the other end of the sampling resistor is grounded.
Optionally, the amplifying module includes: the analog voltage amplifier receives the input voltage detected by the detection module and amplifies the input voltage by a preset multiple to obtain an input voltage amplified by the preset multiple; the digital-to-analog converter is used for converting the input voltage amplified by the preset times into an input voltage of a digital quantity; the comparison module receives the input voltage of the digital quantity.
Optionally, the sampling resistor includes a first resistor and a second resistor connected in series, one end of the first resistor is grounded, and one end of the second resistor is connected to the input voltage;
the amplifying module further comprises a digital multiplier, the digital multiplier receives the input voltage of the digital quantity output by the digital-to-analog converter, and the input voltage of the digital quantity is multiplied by D times and then output to the comparing module; wherein
R1 is the resistance of the first resistor, and R2 is the resistance of the second resistor.
Compared with the scheme of using a power circuit with fixed output, the power circuit has the advantages that the input voltage is compared with the output reference voltage, the input voltage stated here is the actually input voltage, the reference circuit is preset, namely the preset multiple of the actually input voltage is compared with the theoretically required reference voltage, when the actually input voltage is larger, the output voltage is directly adjusted according to the input voltage, and when the actually input voltage is smaller, the output voltage is directly adjusted according to the preset voltage. In other words, the input voltage is unstable in practice, and the output voltage corresponds to the input voltage by having a function mapping relation between the output voltage and the actual input voltage; and the output voltage is adjusted according to the change of the input voltage. Furthermore, the scheme of the fixed output power circuit generally considers the problem of the maximum output power, so that generally, a larger actual output voltage is given, and even under the condition that the input voltage is smaller, a high-power output voltage is still output, thereby causing great power consumption loss. For example, when the high-power output voltage is 17V and the normal output voltage only needs to reach 14.3V, the 12V boost output can obtain the normal working voltage of 14.3V corresponding to the actual input voltage of 12V, and the output of 17V is not needed at this time, so that the highest output voltage can be prevented from being constantly and fixedly used for output after dynamic adjustment, and the effect of saving power consumption is achieved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
fig. 1 is a schematic step diagram of a driving method of a display panel according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a driving circuit of a display panel according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a driver circuit according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a driver circuit according to another embodiment of the present application;
FIG. 5 is a schematic diagram of a control circuit of an embodiment of the present application;
FIG. 6 is a schematic diagram of a control circuit according to another embodiment of the present application.
10, a driving circuit; 20. a display panel; 100. a control circuit; 110. a detection module; 111. sampling a resistor; 112. a first resistor; 113. a second resistor; 120. an amplifying module; 121. an analog voltage amplifier; 122. a digital-to-analog converter; 123. a digital multiplier; 130. a storage module; 131. I2C interface D/A conversion memory cell; 132. a memory; 140. a comparison module; 150. a boost converter; 200. a booster circuit.
Detailed Description
It is to be understood that the terminology, the specific structural and functional details disclosed herein are for the purpose of describing particular embodiments only, and are representative, but that the present application may be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.
In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating relative importance or as implicitly indicating the number of technical features indicated. Thus, unless otherwise specified, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "plurality" means two or more. The terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that one or more other features, integers, steps, operations, elements, components, and/or combinations thereof may be present or added.
Further, terms of orientation or positional relationship indicated by "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, are described based on the orientation or relative positional relationship shown in the drawings, are simply for convenience of description of the present application, and do not indicate that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.
Furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, fixed connections, removable connections, and integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
The present application is described in detail below with reference to the figures and alternative embodiments.
As shown in fig. 1, as an embodiment of the present application, a method for driving a display panel is disclosed, including the steps of:
s10: presetting an output reference voltage;
s20: detecting the input voltage of a power circuit to obtain a preset multiple of the input voltage of the power circuit;
s30: comparing the preset multiple of the input voltage of the power circuit with the output reference voltage;
s40: controlling the output of the output voltage of the power supply circuit according to the comparison result;
when the preset multiple of the input voltage is larger than the output reference voltage, the output voltage output is adjusted according to the preset multiple of the input voltage;
when the preset multiple of the input voltage is less than or equal to the output reference voltage, adjusting the output voltage output according to the output reference voltage;
the output reference voltage is a minimum output voltage.
Compared with the scheme of using a power circuit with fixed output, the power circuit has the advantages that the input voltage is compared with the output reference voltage, the input voltage stated here is the actually input voltage, the reference circuit is preset, namely the preset multiple of the actually input voltage is compared with the theoretically required reference voltage, when the actually input voltage is larger, the output voltage is directly adjusted according to the input voltage, and when the actually input voltage is smaller, the output voltage is directly adjusted according to the preset voltage. In other words, the input voltage is unstable in practice, and the output voltage corresponds to the input voltage by having a function mapping relation between the output voltage and the actual input voltage; and the output voltage is adjusted according to the change of the input voltage. Furthermore, the scheme of the fixed output power circuit generally considers the problem of the maximum output power, so that generally, a larger actual output voltage is given, and even under the condition that the input voltage is smaller, a high-power output voltage is still output, thereby causing great power consumption loss. For example, when the high-power output voltage is 17V and the normal output voltage only needs to reach 14.3V, the 12V boost output can obtain the normal working voltage of 14.3V corresponding to the actual input voltage of 12V, and the output of 17V is not needed at this time, so that the highest output voltage can be prevented from being constantly and fixedly used for output after dynamic adjustment, and the effect of saving power consumption is achieved.
It should be noted that the input voltage and the output voltage stated in the present application are mainly related to the boost circuit in the power management integrated circuit, that is, the output voltage provides the reference voltage for the gamma circuit, and this reference voltage is different for different panels, for example, MNT is generally 12V, NB is generally 10V, and TV is generally 17V. For the display panel of the present application, generally, the gray scale voltage required by the gamma circuit is only 13.8V, but considering the influence of the ripple, the voltage of at least 14.3V is required, and considering the load condition, so the set voltage of the fixed output can reach 16V. The set voltage of the fixed output is the maximum output voltage, because the fluctuation condition of the input voltage needs to be considered, the output voltage generally gives the maximum output voltage, and when the input voltage is larger, the situation that the output voltage is too close to the output voltage to influence the normal operation of the booster circuit is prevented; the following examples will be discussed with respect to the boost factor under normal operation of the boost circuit.
Specifically, the output reference voltage is a minimum output voltage. The scheme of the application is suitable for the booster circuit in the power supply integrated circuit, the output voltage provided by the booster voltage is mainly used for the gamma voltage as the reference voltage of the gray scale voltage, and therefore, the minimum output voltage is required for the output voltage. Therefore, the minimum output voltage is set as the output reference voltage in this scheme, thereby dividing the input voltage into a portion that does not reach the minimum output voltage and another portion that exceeds the minimum output voltage. When the input voltage is small, the output voltage cannot meet the minimum output voltage; the output voltage is therefore adjusted directly to the preset reference voltage. It should be noted that the condition of the above scheme is that in order to satisfy the normal operation of the boost circuit, the amplification factor in the steady operation state of the boost circuit is determined. Therefore, when the input voltage is low, the input voltage cannot be continuously amplified under a stable condition, so that the small input voltage can be boosted to the minimum output voltage.
The output voltage is adjusted by adjusting the duty ratio and frequency of the output signal. When the preset multiple of the input voltage is greater than the output reference voltage, the step of outputting the output voltage corresponding to the input voltage comprises the following steps:
s401: when the preset multiple of the input voltage is larger than the output reference voltage;
s402: reading the numerical value of the preset multiple of the input voltage;
s403: adjusting the duty ratio and frequency of an output signal according to the value of the preset multiple of the input voltage, and outputting according to the preset multiple of the input voltage;
when the preset multiple of the input voltage is less than or equal to the output reference voltage, the step of outputting by taking the output reference voltage as the output voltage comprises the following steps:
s411: when the preset multiple of the input voltage is less than or equal to the output reference voltage;
s412: reading the value of the output reference voltage;
s413: and adjusting the duty ratio and the frequency of an output signal by referring to the value of the output reference voltage so as to output the output signal with the output reference voltage.
The duty ratio and the frequency are selected according to the functional relation between the input voltage and the output voltage, and the appropriate output voltage is correspondingly output. The selection of duty cycle and frequency is described in detail below in conjunction with specific circuitry.
As shown in fig. 2, a driving circuit 10 of a display panel 20 is disclosed, the driving circuit 10 includes a voltage boosting circuit 200 and a control circuit 100, the control circuit 100 controls an output voltage output by the voltage boosting circuit 200; the input end of the boosting circuit 200 provides an input voltage; as shown in fig. 3, the boost circuit 200 is a dc boost circuit 200 (i.e. a boost circuit), and the control circuit 100 is connected to a control terminal of the boost circuit 200, and the control terminal controls an output voltage of the boost circuit 200 by adjusting a duty ratio and a frequency. The boost circuit 200 includes an input terminal providing an input voltage Vin, an inductor L1, one end of the inductor L1 connected to the input terminal, and the other end connected to a control terminal, which is an equivalent circuit diagram in this embodiment, the corresponding control terminal is an active switch Q1, and further includes a diode D1 connected in parallel to the active switch Q1, one end of the diode is connected to a parallel circuit of a capacitor C1 and a resistor R1, and the voltage at the two ends of the corresponding R1 is the output voltage. The control end inputs a PWM (pulse width modulation) pulse width modulation signal.
Wherein, the inductance L1 has the following functions: the energy conversion device is used for converting electric energy and magnetic field energy into each other, when the first active switch Q1 is switched on, the inductor L1 converts the electric energy into the magnetic field energy to be stored, when the first active switch Q1 is switched off, the inductor converts the stored magnetic field energy into the electric field energy, the energy is superposed with the input power supply voltage and then filtered by the diode and the capacitor to obtain smooth direct current voltage to be supplied to a load, and the voltage is formed after the input power supply voltage and the magnetic field energy of the inductor are converted into the superposition of the electric energy, so that the output voltage is higher than the input voltage, and the boosting process is finished; the diode D1 mainly plays an isolation role, that is, when the first active switch Q1 is turned on, the voltage of the positive electrode of the diode D1 is lower than the voltage of the negative electrode, and at this time, the diode D1 is turned off in reverse bias, so that the energy storage process of the inductor does not affect the normal power supply of the output end capacitor to the load; when the first active switch Q1 is turned off, the two types of energy after being superposed are turned to negative through the diode D1When the load is powered, the diode D1 is conducting in the forward direction, and it is required that the smaller the forward voltage drop is, the better the forward voltage drop is, and the more energy is supplied to the load side as much as possible. Namely correspondingly, can be divided into: when the first active switch Q1 is turned on, in a first stage, the input voltage Vin charges the inductor L, and the voltage of the inductor is raised to Vin. Diode D1 turns off and capacitor C discharges the stored charge. In the second stage, when the first active switch Q1 is turned off, the diode D1 is turned on, and the power Vin charges the capacitor C through the inductor L and is connected to the load, i.e., the gamma circuit, where Vout is formed as the output voltage. Therefore, the ratio of the on-time of the first active switch to the on-time is the on-time ratio Don, and the ratio of the off-time of the first active switch to the on-time is the off-time ratio Doff, which can be obtained by the formula:
therefore, the amplification factor of the boosted voltage can be changed only by adjusting the duty ratio and the frequency.
As shown in fig. 4, as another embodiment of the present application, a driving circuit 10 of a display panel 20 is disclosed, where the driving circuit 10 uses the above driving method, the driving circuit 10 includes a Boost circuit 200 and a control circuit 100, where the Boost circuit 200 is the above Boost circuit, and the control circuit 100 is connected to a control terminal of a first active switch Q1; unlike the voltage boost circuit 200 in the previous embodiment, the resistor R1 is connected to one end of the control circuit 100 (i.e., to the COMPA end of the control chip in the case where the control circuit 100 is integrated as a chip), to the voltage boost converter 150; the control circuit 100 controls the output voltage output by the boosting circuit 200; the input end of the boosting circuit 200 provides an input voltage; in the present embodiment, the input voltage VCC corresponds to Vin in the previous embodiment, the output voltage AVDD in the present embodiment corresponds to Vout in the previous embodiment, and the resistor R1 and the capacitor C4 are RC compensation for loop stabilization; the second active switch Q2 is used for controlling the output time of VAA, VCC input, VAA generation and output after the boost circuit 200 is powered on, and the second active switch Q2 is added for delaying VAA for a certain time and then sending to other subsequent circuits; the AVDDF is used for monitoring output voltage AVDD, and has the functions of over-current, voltage rise, direct work stop of the circuit, IC protection and the like.
As shown in fig. 5, the control circuit 100 includes: the detection module 110, the amplification module 120, the storage module 130, the comparison module 140 and the boost converter 150; the detection module 110 is used for detecting the input voltage; the amplifying module 120 amplifies the input voltage by a preset multiple; the memory module 130 stores a preset output reference voltage; the comparison module 140 receives the input voltage amplified by the preset times by the amplification module 120 and the preset output reference voltage of the storage module 130, and compares the input voltage with the output reference voltage; the boost converter 150 receives the comparison result of the comparison module 140, and controls the output voltage of the boost circuit 200 according to the comparison result.
The driving circuit 10 in this embodiment detects the input voltage through the detection module 110 of the control circuit 100, amplifies the input voltage by a predetermined multiple through the amplification module 120, compares the amplified input voltage with an output reference voltage preset in the storage module 130, and selects an appropriate output voltage according to a comparison result to output the output voltage. When the input voltage is different, for example, under an unstable external power input or under different conditions, the boost circuit 200 can be stably output by the control circuit 100.
Specifically, the memory module 130 includes an I2C interface digital-to-analog conversion storage unit 131 and a memory 132, where the I2C interface digital-to-analog conversion storage unit 131 is connected to the outside and includes an SDA, an SCL and an NWR end, where the SDA and the SCL are traces of I2C protocol transmission data, and the NWR is a protection setting end for data writing. To write the setting data of the driving circuit 10 into the memory using the I2C protocol, the NWR is pulled up or down, and if the NWR is in a low level state for a normal time, the memory 132 can be rewritten only by pulling up the NWR to a high level state, otherwise the same applies. The digital-to-analog conversion storage unit 131 on the I2C interface writes a preset output reference voltage into the EFPROM, for example, the output voltage VAA needs at least 15V, so the digital-to-analog conversion storage unit on the I2C interface writes the 15V setting into the memory, and reads from the memory during operation.
As shown in fig. 6, the detection module 110 includes: and one end of the sampling resistor 111 is connected to the input voltage, and the other end of the sampling resistor 111 is grounded. The present application accesses the voltage value of the input voltage to the control circuit 100 through the sampling resistor 111 for detecting the change of the input voltage in real time or before each startup, and the input voltage may be different under different conditions and may also be unstable according to the above mentioned conditions. After real-time monitoring, the output voltage is adjusted according to the change of the input voltage, so that stable output can be ensured, and the problem of larger power consumption caused by output of the highest output voltage is prevented.
Specifically, the sampling resistor 111 used in the present application is a series resistor. The sampling resistor 111 comprises a first resistor 112 and a second resistor 113 which are connected in series, one end of the first resistor 112 is grounded, and one end of the second resistor 113 is connected with the input voltage; the input voltage is divided into the first resistor 112 and the second resistor 113, the voltage of the first resistor 112 is detected according to the serial division, and the voltage value of the input voltage can be calculated according to the resistance ratio of the first resistor 112 and the second resistor 113.
Specifically, the amplification module 120 of the present application further includes: the analog voltage amplifier 121 receives the input voltage detected by the detection module 110, and amplifies the input voltage by a preset multiple to obtain an input voltage amplified by the preset multiple; the digital-to-analog converter is used for converting the input voltage amplified by the preset times into an input voltage of a digital quantity; the comparison module 140 receives the input voltage of the digital quantity. The amplifying module 120 amplifies the sampled input voltage by a preset multiple, and converts the amplified input voltage by the preset multiple into an input voltage signal of a digital quantity through a digital-to-analog converter. The dac 122 divides the 18V voltage into 360 parts, each of which is about 0.05V, taking the analog voltage 18V as an example, and converts the divided voltage into an input voltage signal of digital quantity.
As mentioned above, the amplifying module 120 further includes the digital multiplier 123 corresponding to the first resistor 112 and the second resistor 113, wherein the digital multiplier 123 receives the input voltage of the digital quantity output by the digital-to-analog converter, multiplies the input voltage of the digital quantity by D times, and outputs the multiplied voltage to the comparing module 140; where D is the ratio of the sum of the first resistance 112 and the second resistance 113 to the first resistance 112. I.e. to restore the voltage value of the input voltage. For example, the first resistor 112 has a resistance of 1k, the second resistor 113 has a resistance of 3k, and the corresponding digital multiplier 123 has a magnification of 4.
The step of reading the value of the preset multiple of the input voltage comprises:
reading an input voltage;
amplifying a preset multiple;
and obtaining the numerical value of the preset multiple of the input voltage.
The step of obtaining the value of the preset multiple of the input voltage comprises the following steps:
performing digital-to-analog conversion on the input voltage amplified by the preset times to convert the input voltage into digital input voltage;
the preset multiple is 1.1-1.3 times.
Corresponding to the device, after the input voltage is read by the resistor, the preset times are amplified by the analog voltage amplifier, and the digital-to-analog converter performs digital-to-analog conversion on the input voltage amplified by the preset times and converts the input voltage into the input voltage of digital quantity; and finally, comparing the input voltage of the digital quantity with a preset output reference voltage.
In accordance with the above, the driving method of the display panel includes, after outputting the voltage according to the comparison result, the steps of:
s50: monitoring the output voltage;
s51: and when the output voltage at the current moment is smaller than the output voltage at the previous moment, adjusting the duty ratio and the frequency of the output signal.
In this embodiment, the output voltage is monitored, and when the input voltage or the load is unstable, the output voltage may fluctuate, and the duty ratio of the output needs to be adjusted in time to make the output voltage have stability.
It should be noted that the inventive concept of the present application can form many embodiments, but the present application has a limited space and cannot be listed one by one, so that, on the premise of no conflict, any combination between the above-described embodiments or technical features can form a new embodiment, and after the embodiments or technical features are combined, the original technical effect will be enhanced.
It should be noted that, the limitations of each step in the present disclosure are not considered to limit the order of the steps without affecting the implementation of the specific embodiments, and the steps written in the foregoing may be executed first, or executed later, or even executed simultaneously, and as long as the present disclosure can be implemented, all the steps should be considered as belonging to the protection scope of the present application.
The technical solution of the present application can be widely applied to various display panels, such as TN (Twisted Nematic) display panel, IPS (In-Plane Switching) display panel, VA (Vertical Alignment) display panel, MVA (Multi-Domain Vertical Alignment) display panel, and of course, other types of display panels, such as OLED (Organic Light-Emitting Diode) display panel, and the above solution can be applied thereto.
The foregoing is a further detailed description of the present application in connection with specific alternative embodiments and it is not intended that the present application be limited to these specific details. For those skilled in the art to which the present application pertains, several simple deductions or substitutions may be made without departing from the concept of the present application, and all should be considered as belonging to the protection scope of the present application.
Claims (10)
1. A method of driving a display panel, comprising the steps of:
presetting an output reference voltage;
detecting the input voltage of a power circuit to obtain a preset multiple of the input voltage of the power circuit;
comparing the preset multiple of the input voltage of the power supply circuit with the output reference voltage; and
controlling the output of the output voltage of the power supply circuit according to the comparison result;
wherein the step of controlling the output of the output voltage according to the comparison result comprises:
when the preset multiple of the input voltage is larger than the output reference voltage, adjusting the output voltage according to the preset multiple of the input voltage;
when the preset multiple of the input voltage is less than or equal to the output reference voltage, adjusting the output of the output voltage according to the output reference voltage;
the output reference voltage is a minimum output voltage.
2. The method according to claim 1, wherein the step of outputting the output voltage corresponding to the input voltage when the preset multiple of the input voltage is greater than the output reference voltage comprises the steps of:
when the preset multiple of the input voltage is larger than the output reference voltage;
reading the numerical value of the preset multiple of the input voltage;
adjusting the duty ratio and the frequency of an output signal according to the value of the preset multiple of the input voltage, and outputting according to the preset multiple of the input voltage;
when the preset multiple of the input voltage is less than or equal to the output reference voltage, the step of outputting by taking the output reference voltage as the output voltage comprises the following steps:
when the preset multiple of the input voltage is less than or equal to the output reference voltage;
reading the value of the output reference voltage;
and adjusting the duty ratio and the frequency of an output signal by referring to the value of the output reference voltage so as to output the output signal with the output reference voltage.
3. The method for driving a display panel according to claim 2, wherein the step of outputting the voltage according to the comparison result comprises the steps of:
monitoring the output voltage; and
and when the output voltage at the current moment is smaller than the output voltage at the previous moment, adjusting the duty ratio and the frequency of the output voltage.
4. The method according to claim 2, wherein the step of reading the value of the preset multiple of the input voltage comprises:
reading the input voltage;
amplifying a preset multiple; and
and obtaining the numerical value of the preset multiple of the input voltage.
5. The method according to claim 4, wherein the step of obtaining the value of the preset multiple of the input voltage comprises:
performing digital-to-analog conversion on the input voltage amplified by the preset times to convert the input voltage into digital input voltage;
the preset multiple is 1.1-1.3 times.
6. A driving circuit of a display panel, comprising:
the control circuit controls the output voltage output by the boosting circuit; the input end of the booster circuit provides an input voltage;
the control circuit includes:
the detection module is used for detecting the input voltage;
the amplifying module is used for amplifying the input voltage by a preset multiple;
the storage module stores a preset output reference voltage;
the comparison module is used for respectively receiving the input voltage amplified by the amplification module by a preset multiple and the preset output reference voltage of the storage module, and comparing the input voltage with the output reference voltage; and
the boost converter receives the comparison result of the comparison module and controls the output voltage of the boost circuit to be output according to the comparison result;
when the preset multiple of the input voltage is larger than the output reference voltage, adjusting the output voltage according to the preset multiple of the input voltage;
when the preset multiple of the input voltage is less than or equal to the output reference voltage, adjusting the output of the output voltage according to the output reference voltage; the output reference voltage is a minimum output voltage.
7. The driving circuit of the display panel according to claim 6, wherein the voltage boost circuit is a dc voltage boost circuit, the control circuit is connected to a control terminal of the dc voltage boost circuit, and the control terminal controls an output voltage of the dc voltage boost circuit by adjusting a duty ratio and a frequency.
8. The driving circuit of the display panel according to claim 6, wherein the detection module comprises: and one end of the sampling resistor is connected to the input voltage, and the other end of the sampling resistor is grounded.
9. The driving circuit of the display panel according to claim 8, wherein the amplifying module comprises:
the analog voltage amplifier receives the input voltage detected by the detection module and amplifies the input voltage by a preset multiple to obtain an input voltage amplified by the preset multiple; and
the digital-to-analog converter is used for converting the input voltage amplified by the preset times into an input voltage of a digital quantity;
the comparison module receives the input voltage of the digital quantity.
10. The driving circuit of the display panel according to claim 9, wherein the sampling resistor comprises a first resistor and a second resistor connected in series, one end of the first resistor is connected to ground, and one end of the second resistor is connected to the input voltage;
the amplifying dieThe block also comprises a digital multiplier, the digital multiplier receives the input voltage of the digital quantity output by the digital-to-analog converter, and the input voltage of the digital quantity is multiplied by D times and then output to the comparison module; wherein
R1 is the resistance of the first resistor, and R2 is the resistance of the second resistor.
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| CN113870760B (en) * | 2021-09-27 | 2022-06-07 | 惠科股份有限公司 | Gamma adjustment circuit and driving method |
| CN114267280B (en) * | 2021-12-24 | 2023-10-13 | 绵阳惠科光电科技有限公司 | Gamma voltage generation circuit and display device |
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