CN110599935B - Automatic adjusting device and automatic adjusting method for public voltage - Google Patents
Automatic adjusting device and automatic adjusting method for public voltage Download PDFInfo
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- CN110599935B CN110599935B CN201910792214.XA CN201910792214A CN110599935B CN 110599935 B CN110599935 B CN 110599935B CN 201910792214 A CN201910792214 A CN 201910792214A CN 110599935 B CN110599935 B CN 110599935B
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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
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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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
- G09G3/3696—Generation of voltages supplied to electrode drivers
Abstract
The invention provides an automatic adjusting device of public voltage, which comprises a photoelectric sensor, a waveform processing device and a data processor, wherein the photoelectric sensor is used for detecting the voltage of a public line; the method comprises the steps that a photoelectric sensor collects display picture information of a display panel and performs photoelectric conversion to obtain a first alternating current signal; the waveform processing device is connected with the photoelectric sensor to perform waveform processing on the first alternating current signal to obtain a second alternating current signal; the data processor is connected with the waveform processing device to control the power supply chip to adjust the common voltage, measure the corresponding flicker degree of the display picture according to the second alternating current signal and determine the optimal common voltage value when the flicker degree of the display picture is minimum. The invention also provides an automatic adjusting method of the public voltage. The invention can automatically adjust and obtain the optimal public voltage value without a color analyzer, thereby saving manpower and material resources.
Description
Technical Field
The invention belongs to the technical field of liquid crystal display, and particularly relates to an automatic adjusting device and an automatic adjusting method for public voltage.
Background
At present, when a liquid crystal display device displays a picture, a certain Flicker phenomenon always exists, and when the Flicker phenomenon is serious, the display effect is seriously influenced, visual fatigue and other discomfort of an observer can be caused, and the Flicker degree of the liquid crystal display device can be adjusted to be minimum by adjusting a common voltage, so that the display effect of the liquid crystal display device can be best. Therefore, in the research, development, production and test processes of the liquid crystal display device, it is often necessary to manually set the common voltage as a plurality of common voltage values, sequentially test the flicker degree of the picture of the display panel of the liquid crystal display device under the corresponding common voltage by using a color analyzer (such as CA 310) to obtain the optimal common voltage value so as to minimize the flicker degree of the picture, and then start the OTP (one time program) burning by using a manual button to burn the optimal common voltage value into the power chip.
However, in the above testing and burning process, not only the machine of the color analyzer is large in size and expensive, but also the testing needs to be adjusted manually for many times, and the OTP burning needs to be started manually subsequently, which consumes manpower and material resources.
Disclosure of Invention
In view of the above, the present invention is directed to provide an automatic adjusting device and an automatic adjusting method for a common voltage, which can automatically adjust and obtain an optimal common voltage value without a color analyzer, thereby saving manpower and material resources.
The embodiment of the invention provides an automatic public voltage adjusting device, which is used for measuring the optimal public voltage value when a display panel displays a picture, wherein the display panel is connected with a signal source to receive picture signals and is also connected with a power chip to display the picture under the public voltage provided by the power chip; the photoelectric sensor acquires display picture information of the display panel and performs photoelectric conversion to obtain a first alternating current signal; the waveform processing device is connected with the photoelectric sensor to perform waveform processing on the first alternating current signal to obtain a second alternating current signal; and the data processor is respectively connected with the power supply chip and the waveform processing device so as to control the power supply chip to adjust the public voltage, measure the corresponding flicker degree of the display picture according to the second alternating current signal and determine the optimal public voltage value when the flicker degree of the display picture is minimum.
Further, after the power chip outputs the initial common voltage, the data processor controls the power chip to adjust the common voltage in the forward direction, and judges whether the flicker degree of the display picture is reduced, if so, the power chip is controlled to maintain the common voltage in the forward direction, and the change amplitude of the common voltage is adjusted according to the flicker degree of the display picture, if not, the power chip is controlled to change into the common voltage in the reverse direction, and the change amplitude of the common voltage is adjusted according to the flicker degree of the display picture; and when the flicker degree of the picture to be displayed is minimum, the data processor obtains the optimal common voltage value.
Further, the data processor comprises an analog-to-digital conversion unit, the data processor acquires a plurality of voltage values of the second alternating current signal through the analog-to-digital conversion unit to determine a maximum value and a minimum value of the second alternating current signal, and the flicker degree of the display picture is calculated through a calculation formula (1): flicker (FMA) indicates a Flicker level of a display screen in the formula (1) = (Vmax-Vmin)/((Vmax + Vmin)/2) x 100%, and Vmax and Vmin indicate a maximum value and a minimum value of the second ac electric signal, respectively.
Further, the waveform processing device comprises a first-stage amplifying circuit, a direct current filter circuit and a second-stage amplifying circuit, wherein the first-stage amplifying circuit is connected with the photoelectric sensor to amplify the voltage of the first alternating current signal; the direct current filter circuit is connected with the first-stage amplifying circuit to filter out direct current waveforms; the second-stage amplifying circuit is connected with the direct current filter circuit to carry out voltage bias and amplification to obtain the second alternating current signal.
Further, the first-stage amplifying circuit includes a first amplifier, a first resistor and a second resistor, a positive phase input terminal of the first amplifier receives a first bias voltage, an inverting phase input terminal of the first amplifier is connected to a positive terminal of the photoelectric sensor to receive the first alternating current signal, and is further connected to a first terminal of the first resistor, an output terminal of the first amplifier is connected to a second terminal of the second resistor, a second terminal of the first resistor is connected to a first terminal of the second resistor, and a negative terminal of the photoelectric sensor is grounded; the direct current filter circuit comprises a first capacitor, a first end of the first capacitor is connected with the first-stage amplifying circuit, and a second end of the first capacitor is connected with the second-stage amplifying circuit; the second-stage amplifying circuit comprises a second amplifier, a third resistor, a fourth resistor and a fifth resistor, wherein a positive phase input end of the second amplifier is connected with a second end of the third resistor, a negative phase input end of the second amplifier is connected with a first end of the fourth resistor and is also connected with a first end of the fifth resistor, an output end of the second amplifier is connected with a second end of the fifth resistor and is also connected with the data processor, a first end of the third resistor is connected with the direct current filter circuit and receives a second bias voltage, and a second end of the fourth resistor is grounded.
Furthermore, the automatic regulating device also comprises a burning device which is used for writing the optimal common voltage value into a read-only memory of the power supply chip.
Further, the automatic adjusting device further comprises a detection display device, and the detection display device is connected with the data processor to display the waveform of the second alternating current signal.
The embodiment of the invention also provides a public voltage adjusting method, which is used for measuring the optimal public voltage value when a display panel displays a picture, wherein the display panel is connected with a signal source to receive picture signals and is also connected with a power chip to display the picture under the public voltage provided by the power chip, and the automatic adjusting method comprises the following steps: s1, outputting an initial common voltage by the power supply chip; s2, obtaining a first alternating current signal through photoelectric conversion; s3, obtaining a second alternating current signal through waveform processing; and S4, controlling the power supply chip to adjust the common voltage, measuring the corresponding flicker degree of the display picture, and determining the optimal common voltage value when the flicker degree of the display picture is minimum.
Further, the step of controlling the power supply chip to adjust the common voltage and measuring the flicker degree corresponding to the display screen includes: s41, controlling the power supply chip to adjust the common voltage in the forward direction; s42, judging whether the flicker degree of the display picture is reduced or not; s43, if yes, controlling the power supply chip to keep the positive adjustment of the common voltage, and adjusting the amplitude of the change of the common voltage according to the flicker degree of the display picture; s44, if not, controlling the power supply chip to change into a reverse regulation public voltage, and regulating the amplitude of the public voltage change according to the flicker degree of the display picture; and S45, when the flicker degree of the picture to be displayed is minimum, obtaining the optimal common voltage value.
Further, the step of measuring the degree of flicker corresponding to the display screen includes: acquiring a plurality of voltage values of the second alternating current signal through analog-to-digital conversion to determine the maximum value and the minimum value of the second alternating current signal, and calculating the flicker degree of a display picture through a calculation formula (1):
Flicker(FMA)＝(Vmax-Vmin)/((Vmax+Vmin)/2)x 100％ (1)
in the formula, flicker (FMA) indicates a Flicker degree of a display screen, and Vmax and Vmin respectively indicate a maximum value and a minimum value of the second alternating current signal.
According to the automatic public voltage adjusting device and the automatic public voltage adjusting method, the first alternating current signal is obtained through photoelectric conversion, the second alternating current signal is obtained through waveform processing, and the flicker degree of the picture under the public voltage is measured, so that the power supply chip can be controlled to automatically adjust the public voltage, when the flicker degree of the picture to be displayed tends to be minimum, the corresponding optimal public voltage value can be obtained, the optimal public voltage value can be automatically adjusted without a color analyzer, and manpower and material resources are saved.
In order to make the aforementioned and other objects, features and advantages of the invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a schematic circuit diagram of an automatic adjusting device according to a first embodiment of the present invention.
Fig. 2 is a flowchart of an auto-adjustment method according to a first embodiment of the present invention.
Fig. 3 is a flow chart of the voltage adjustment of the automatic adjustment method according to the first embodiment of the present invention.
Fig. 4 is a waveform diagram of the second alternating current signal detected by the data processor of the first embodiment of the present invention.
Fig. 5 is a schematic circuit diagram of a waveform processing apparatus according to a second embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention for achieving the intended purpose, the following detailed description of the embodiments, methods, steps, structures, features and effects of the automatic adjusting device according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.
The foregoing and other technical and other features and advantages of the invention will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings. While the present invention has been described in terms of embodiments with a view to achieving the intended purpose and with a view to achieving a more complete and detailed understanding of the invention, reference is now made to the drawings, which are for purposes of illustration and description, and are not intended to limit the invention. The embodiment of the invention provides an automatic adjusting device. Fig. 1 is a schematic circuit diagram of an automatic adjusting apparatus according to a first embodiment of the present invention. As shown in fig. 1, the display panel 200 is connected to a signal source 400 to receive a picture signal, and is also connected to a power chip 300 to display a picture at a common voltage supplied from the power chip 300, and the auto-adjustment device includes a photosensor 110, a waveform processing device 120, and a data processor 130; the photoelectric sensor 110 acquires display picture information of the display panel 200, and performs photoelectric conversion to obtain a first alternating current signal; the waveform processing device 120 is connected to the photoelectric sensor 110 to perform waveform processing on the first ac electrical signal to obtain a second ac electrical signal; the data processor 130 is connected to the power chip 300 and the waveform processing device 120, respectively, to control the power chip 300 to adjust the common voltage and to measure the degree of flicker corresponding to the display screen based on the second ac signal, and to determine an optimal common voltage value when the degree of flicker of the display screen is minimum.
In one embodiment, after the power chip 300 outputs the initial common voltage, the data processor 130 controls the power chip 300 to adjust the common voltage in the forward direction, and determines whether the flicker degree of the display screen is reduced, if so, the power chip 300 is controlled to maintain the common voltage in the forward direction, and the change amplitude of the common voltage is adjusted according to the flicker degree of the display screen to gradually reduce the flicker degree of the display screen, and if not, the power chip 300 is controlled to change to adjust the common voltage in the reverse direction, and the change amplitude of the common voltage is adjusted according to the flicker degree of the display screen to gradually reduce the flicker degree of the display screen; when the flicker degree of the picture to be displayed is minimum, the data processor 130 obtains the optimal common voltage value.
Specifically, when the display panel 200 displays a picture, the picture signal provided by the signal source 400 and the common voltage provided by the power chip 300 are respectively received, and the flicker degrees of the displayed picture are different at different common voltages. Fig. 2 is a flowchart of an auto-adjustment method according to a first embodiment of the present invention. Fig. 3 is a flow chart of the voltage adjustment of the automatic adjustment method according to the first embodiment of the invention. As shown in fig. 2 and fig. 3, the specific implementation steps of this embodiment are: s1, the power chip 300 outputs an initial common voltage to the display panel 200; s2, the photoelectric sensor 110 collects display picture information of the display panel 200, a first alternating current signal can be obtained after photoelectric conversion, and the first alternating current signal is output to the waveform processing device 120; s3, the waveform processing device 120 receives the first alternating current signal, performs waveform processing such as amplification, direct current filtering, bias amplification and the like to obtain a second alternating current signal, and outputs the second alternating current signal to the data processor 130; and S4, the data processor 130 controls the power supply chip 300 to adjust the common voltage, measures the corresponding flicker degree of the display picture according to the second alternating current signal, and determines the optimal common voltage value when the flicker degree of the display picture is minimum. S42, the data processor 130 may measure the degree of flicker of the adjusted display screen, and may determine whether the degree of flicker of the display screen is reduced. S43, if yes, the data processor 130 controls the power chip 300 to maintain the positive adjustment common voltage, and adjusts the amplitude of the common voltage change according to the flicker degree of the display frame to gradually reduce the flicker degree of the display frame. S44, if not, the data processor 130 controls the power chip 300 to change to the reverse-direction adjustment common voltage, and adjusts the amplitude of the change of the common voltage according to the flicker degree of the display frame to gradually reduce the flicker degree of the display frame. Therefore, the data controller determines that the power supply chip 300 performs the forward adjustment of the common voltage or the reverse adjustment of the common voltage through the determination, and determines the amplitude of the change of the common voltage according to the flicker degree of the display screen, so that the display panel 200 performs adjustment in a direction of reducing the flicker degree of the display screen in a subsequent adjustment process, and can control the flicker degree of the display screen to be reduced and to be stable by adjusting the amplitude of the change of the common voltage. S45, when the flicker degree of the picture to be displayed is minimum, the data processor 130 obtains the optimal common voltage value. Therefore, the automatic adjusting device can automatically adjust to obtain the optimal public voltage value, a color analyzer is not needed in the adjusting process, manual adjustment is not needed, and manpower and material resources are saved.
In one embodiment, if the power chip 300 adjusts the common voltage in the forward direction by gradually increasing the common voltage, the adjusting the common voltage in the reverse direction by gradually decreasing the common voltage; if the power supply chip 300 adjusts the common voltage in the forward direction by gradually decreasing the common voltage, the adjusted common voltage in the reverse direction is gradually increasing the value of the common voltage.
In an embodiment, the data processor 130 includes an analog-to-digital conversion unit, the data processor 130 acquires a plurality of voltage values of the second ac electrical signal through the analog-to-digital conversion unit to determine a maximum value and a minimum value of the second ac electrical signal, fig. 4 is a schematic waveform diagram of the second ac electrical signal detected by the data processor 130 according to the first embodiment of the present invention, as shown in fig. 4, the data processor 130 may acquire the maximum value and the minimum value of the second ac electrical signal, and calculate the flicker degree of the display screen through the calculation formula (1):
Flicker(FMA)＝(Vmax-Vmin)/((Vmax+Vmin)/2)x 100％ (1)
in the formula, flicker (FMA) indicates the degree of Flicker of the display screen, and Vmax and Vmin respectively indicate the maximum value and the minimum value of the second alternating current signal.
In one embodiment, the auto-adjusting device may further include a writing device for writing the optimal common voltage value into the rom of the power chip 300. Meanwhile, in the automatic adjustment method shown in fig. 2, the method may further include the steps of: and S6, writing the optimal common voltage value into the read-only memory of the power chip 300.
In one embodiment, the automatic adjusting device may further include a detection display device 140, and the detection display device 140 is connected to the data processor 130 to display the waveform of the second ac electrical signal, for example, the detection display device 140 may be used to display a waveform diagram of the second ac electrical signal detected by the data processor 130 shown in fig. 4. The waveform of the second ac electrical signal displayed by the detection display device 140 may be used to indirectly display the flicker degree of the display screen, for example, the smaller the difference between the maximum value and the minimum value (i.e. the difference between the peak voltage and the trough voltage) of the waveform of the second ac electrical signal is, the smaller the flicker degree of the display screen is, and vice versa.
According to the automatic public voltage adjusting device provided by the embodiment of the invention, the first alternating current signal is obtained through photoelectric conversion, and the second alternating current signal is obtained through waveform processing and is used for measuring the flicker degree of the picture under the public voltage, so that the data processor 130 can control the power supply chip 300 to automatically adjust the public voltage, when the flicker degree of the picture to be displayed tends to be minimum, the corresponding optimal public voltage value can be obtained, the optimal public voltage value can be automatically adjusted and obtained without a color analyzer, and manpower and material resources are saved.
Fig. 5 is a schematic circuit connection diagram of a waveform processing apparatus 120 according to a second embodiment of the present invention. The automatic adjustment device of the present embodiment is basically the same in structure as the automatic adjustment device of the first embodiment, and differs only in that: the waveform processing device comprises a first-stage amplifying circuit 121, a direct current filter circuit 122 and a second-stage amplifying circuit 123, wherein the first-stage amplifying circuit 121 is connected with the photoelectric sensor 110 to amplify the voltage of the first alternating current signal; the dc filter circuit 122 is connected to the first stage amplifier circuit 121 to filter out dc waveforms; the second stage amplifying circuit 123 is connected to the dc filter circuit 122 for voltage biasing and amplifying to obtain a second ac signal.
In an embodiment, the first-stage amplifying circuit 121 may include a first amplifier A1, a first resistor R1, and a second resistor R2, a non-inverting input terminal of the first amplifier A1 receives the first bias voltage V1, an inverting input terminal of the first amplifier A1 is connected to the positive terminal of the photosensor 110 to receive the first ac signal, and is further connected to a first terminal of the first resistor R1, an output terminal of the first amplifier A1 is connected to a second terminal of the second resistor R2, a second terminal of the first resistor R1 is connected to a first terminal of the second resistor R2, and the negative terminal of the photosensor 110 is grounded.
In an embodiment, the dc filter circuit 122 may include a first capacitor C1, a first end of the first capacitor C1 is connected to the first stage amplifying circuit 121, and a second end of the first capacitor C1 is connected to the second stage amplifying circuit 123.
In an embodiment, the second-stage amplifying circuit 123 may include a second amplifier A2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5, a non-inverting input terminal of the second amplifier A2 is connected to the second terminal of the third resistor R3, an inverting input terminal of the second amplifier A2 is connected to the first terminal of the fourth resistor R4, and is further connected to the first terminal of the fifth resistor R5, an output terminal of the second amplifier A2 is connected to the second terminal of the fifth resistor R5, and is further connected to the data processor 130, a first terminal of the third resistor R3 is connected to the dc filter circuit 122, and is further configured to receive the second bias voltage V2, and a second terminal of the fourth resistor R4 is grounded
Specifically, as shown in fig. 5, the photoelectric sensor 110 may collect display image information of the display panel 200, and perform photoelectric conversion to obtain the first alternating current signal, which is not limited to the specific structure of the photoelectric sensor 110 in this embodiment, and may be a light emitting diode as shown in fig. 5, or a combination of a plurality of light emitting diodes connected in parallel, for example. The first ac electrical signal is amplified by the first-stage amplifying circuit 121, for example, the first-stage amplifying circuit 121 includes a first amplifier A1, and according to a characteristic that voltages at a positive input terminal and a negative input terminal of the first amplifier A1 are equal, and the positive input terminal of the first amplifier A1 receives a first bias voltage V1, a voltage at the negative input terminal of the first amplifier A1 is the first bias voltage V1, a current of the first ac electrical signal passes from the positive input terminal of the first amplifier A1 to an output terminal of the first amplifier A1 through a first resistor R1 and a second resistor R2, and a voltage at the output terminal of the first amplifier A1 is a sum of the voltage at the first negative input terminal and a voltage generated by the current of the first ac electrical signal passing through a first resistor R1 and a second resistor R2, that is a sum of the voltage at the first negative input terminal plus a product of the current of the first ac electrical signal and a total resistance value of the first resistor R1 and the second resistor R2. Accordingly, the first ac signal can be voltage-amplified by providing the first resistor R1 and/or the second resistor R2 having a large resistance value. In an embodiment, the second resistor R2 is an adjustable resistor, and the first ac signal can be amplified conveniently by increasing the resistance of the second resistor R2. In one embodiment, the first resistor R1 may be connected in parallel with the second capacitor C2, so that the filtering may be performed by the second capacitor C2, and the second resistor R2 may be used for performing voltage amplification on the first ac signal.
The dc filter circuit 122 is connected to the first-stage amplifying circuit 121, and configured to filter a dc signal on the first-stage amplifying circuit 121, and only retain a corresponding amplified signal of the first ac signal obtained after photoelectric conversion, for example, the dc filter circuit 122 includes a first capacitor C1, a first end of the first capacitor C1 is connected to the first-stage amplifying circuit 121, that is, may be connected to an output end of the first amplifier A1, and a second end of the first capacitor C1 is connected to the second-stage amplifying circuit 123, so that the dc signal on the first-stage amplifying circuit 121 is filtered by the first capacitor C1.
The second-stage amplifying circuit 123 is connected to the dc filter circuit 122, and since the dc filter circuit 122 filters the dc signal, the remaining ac signal fluctuates around 0v, and the second-stage amplifying circuit 123 may perform voltage bias, so that the ac signal becomes a positive voltage signal that can be collected. For example, the second-stage amplifying circuit 123 includes a second amplifier A2, according to the characteristic that the voltages at the positive input terminal and the negative input terminal of the second amplifier A2 are equal, the positive input terminal of the second amplifier A2 receives a second bias voltage V2 through a third resistor R3, and is further connected to the dc filter circuit 122, the third resistor R3 is an operational amplifier balance resistor, and then the voltage at the negative input terminal of the second amplifier A2 is a superposition of the second bias voltage V2 and the ac signal output by the dc filter circuit 122, so that after the second bias voltage V2 corresponding to the detection convenience is set, the superimposed signal at the negative input terminal of the second amplifier A2 is a positive voltage signal. The inverting input terminal of the second amplifier A2 is grounded through the fourth resistor R4 and is further connected to the output terminal of the second amplifier A2 through the fifth resistor R5, so that the voltage at the output terminal of the second amplifier A2 is amplified by the sum of the resistance of the third resistor R3 and the resistance of the fourth resistor R4 and the resistance of the third resistor R3. Therefore, the second ac electrical signal output by the output terminal of the second amplifier A2 is the first ac electrical signal after amplification, dc filtering and bias amplification, and the second ac electrical signal can be used for the data processor 130 to collect and detect, so as to determine the flicker degree of the display image. Meanwhile, the data processor 130 may perform digital-to-analog conversion through the digital-to-analog conversion unit to detect the second ac signal, and accordingly control the power chip 300 to output the forward adjustment output or the reverse adjustment output common voltage to the display panel 200 according to whether the flicker degree of the display screen is reduced, so that the power chip 300 may finally stably output the optimal common voltage, and the flicker degree of the display screen is minimized.
In an embodiment, the second bias voltage V2 may be provided by the data processor 130, for example, the data processor 130 sets the corresponding second bias voltage V2 data and performs digital-to-analog conversion into the second bias voltage V2 through the digital-to-analog conversion unit.
The waveform processing device of the automatic public voltage adjusting device provided by the embodiment of the invention comprises a first-stage amplifying circuit 121, a direct current filter circuit 122 and a second-stage amplifying circuit 123, and the first alternating current signal is converted into a second alternating current signal through waveform processing such as amplifying, direct current filtering, bias amplifying and the like, so that the data processor 130 can determine the flicker degree of a picture according to the second alternating current signal and control the power chip 300 to automatically adjust the public voltage according to the change of the second alternating current signal, when the flicker degree of the picture to be displayed tends to be minimum, the corresponding optimal public voltage value can be obtained, the optimal public voltage value can be automatically adjusted without a color analyzer, and manpower and material resources are saved.
The embodiment of the present invention is further based on the same inventive concept, and provides an automatic adjustment method of a common voltage, for determining an optimal common voltage value when the display panel 200 displays a picture, wherein the display panel 200 is connected to the display panel 400 to receive a picture signal, and is further connected to the power chip 300 to display the picture under the common voltage provided by the power chip 300, and the automatic adjustment method includes the steps of:
s1, outputting an initial common voltage by a power supply chip 300;
s2, obtaining a first alternating current signal through photoelectric conversion;
s3, obtaining a second alternating current signal through waveform processing;
and S4, controlling the power supply chip 300 to adjust the common voltage, measuring the corresponding flicker degree of the display picture and determining the optimal common voltage value when the flicker degree of the display picture is minimum.
In one embodiment, the step of controlling the power chip 300 to adjust the common voltage and measure the flicker level of the display screen includes:
s41, controlling the power supply chip 300 to adjust the common voltage in the forward direction;
s42, judging whether the flicker degree of the display picture is reduced or not;
s43, if yes, controlling the power supply chip 300 to keep the positive adjustment of the common voltage, and adjusting the amplitude of the change of the common voltage according to the flicker degree of the display picture;
s44, if not, controlling the power supply chip 300 to change to the reverse regulation public voltage, and regulating the amplitude of the public voltage change according to the flicker degree of the display picture;
and S45, when the flicker degree of the picture to be displayed is minimum, obtaining the optimal common voltage value.
Further, the step of measuring the degree of flicker corresponding to the display screen includes: a plurality of voltage values of the second alternating current signal are acquired through analog-to-digital conversion to determine the maximum value and the minimum value of the second alternating current signal, and the flicker degree of a display picture is calculated through a calculation formula (1):
Flicker(FMA)＝(Vmax-Vmin)/((Vmax+Vmin)/2)x 100％ (1)
in the formula, flicker (FMA) is a Flicker degree value of the display panel 200, and Vmax and Vmin are a maximum value and a minimum value of the second ac signal, respectively.
In one embodiment, the automatic adjustment method further comprises the steps of: the optimum common voltage value is written in the read only memory of the power chip 300.
For a specific implementation of the method for automatically adjusting a common voltage in this embodiment, reference may be made to the implementation of the above-mentioned embodiment of the apparatus for automatically adjusting a common voltage, and details are not described here again.
According to the automatic public voltage adjusting method, the first alternating current signal is obtained through photoelectric conversion, and the second alternating current signal is obtained through waveform processing and used for measuring the flicker degree of the picture under the public voltage, so that the power supply chip can be controlled to automatically adjust the public voltage, when the flicker degree of the picture to be displayed tends to be minimum, the corresponding optimal public voltage value can be obtained, the optimal public voltage value can be automatically adjusted without a color analyzer, manpower and material resources are saved
Although the present invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention.
Claims (5)
1. An auto-adjusting apparatus of a common voltage for determining an optimal common voltage value when a display panel (200) displays a picture, the display panel (200) being connected to a signal source (400) to receive a picture signal and further connected to a power chip (300) to display a picture under the common voltage supplied from the power chip (300), the auto-adjusting apparatus comprising:
the photoelectric sensor (110), the photoelectric sensor (110) collects the display picture information of the display panel (200), and obtains a first alternating current signal after photoelectric conversion;
the waveform processing device (120) is connected with the photoelectric sensor (110) to perform waveform processing on the first alternating current signal to obtain a second alternating current signal, wherein the waveform processing device comprises a first-stage amplifying circuit (121), a direct current filter circuit (122) and a second-stage amplifying circuit (123), and the first-stage amplifying circuit (121) is connected with the photoelectric sensor (110) to perform voltage amplification on the first alternating current signal; the direct current filter circuit (122) is connected with the first-stage amplifying circuit (121) to filter out direct current waveforms; the second-stage amplifying circuit (123) is connected with the direct current filter circuit (122) to perform voltage bias and amplification to obtain the second alternating current signal;
the data processor (130), the said data processor (130) couples to said power chip (300) and said waveform processing unit (120) separately, in order to control the said power chip (300) to adjust the public voltage and measure the correspondent flashing degree of the display screen according to the said second alternating current signal, and confirm the best public voltage value when the flashing degree of the display screen is minimum; the data processor (130) comprises an analog-to-digital conversion unit, the data processor (130) acquires a plurality of voltage values of the second alternating current signal through the analog-to-digital conversion unit to determine the maximum value and the minimum value of the second alternating current signal, and the flicker degree of the display picture is calculated through a calculation formula (1):
Flicker(FMA)＝(Vmax-Vmin)/((Vmax+Vmin)/2)x100％ (1)
in the formula, flicker (FMA) is the Flicker degree of the display screen, and Vmax and Vmin are respectively the maximum value and the minimum value of the second alternating current signal;
after the power chip (300) outputs the initial common voltage, the data processor (130) controls the power chip (300) to adjust the common voltage in the forward direction, and judges whether the flicker degree of the display picture is reduced, if so, the power chip (300) is controlled to keep the common voltage adjusted in the forward direction, the change amplitude of the common voltage is adjusted according to the flicker degree of the display picture, if not, the power chip (300) is controlled to change to the common voltage adjusted in the reverse direction, and the change amplitude of the common voltage is adjusted according to the flicker degree of the display picture; when the flicker degree of the picture to be displayed is minimum, the data processor (130) obtains the optimal common voltage value.
2. The automatic adjusting device of claim 1, wherein the first stage amplifying circuit (121) comprises a first amplifier, a first resistor and a second resistor, a non-inverting input terminal of the first amplifier receives a first bias voltage, an inverting input terminal of the first amplifier is connected to a positive terminal of the photosensor (110) to receive the first alternating current signal, and is further connected to a first terminal of the first resistor, an output terminal of the first amplifier is connected to a second terminal of the second resistor, the second terminal of the first resistor is connected to the first terminal of the second resistor, and a negative terminal of the photosensor (110) is grounded;
the direct current filter circuit (122) comprises a first capacitor, a first end of the first capacitor is connected with the first-stage amplification circuit (121), and a second end of the first capacitor is connected with the second-stage amplification circuit (123);
the second-stage amplifying circuit (123) comprises a second amplifier, a third resistor, a fourth resistor and a fifth resistor, wherein a positive phase input end of the second amplifier is connected with a second end of the third resistor, a reverse phase input end of the second amplifier is connected with a first end of the fourth resistor and is also connected with a first end of the fifth resistor, an output end of the second amplifier is connected with a second end of the fifth resistor and is also connected with the data processor (130), a first end of the third resistor is connected with the direct current filter circuit (122) and is also used for receiving a second bias voltage, and a second end of the fourth resistor is grounded.
3. The automatic regulating device according to claim 1, further comprising a burning device for writing the optimal common voltage value into a read only memory of the power supply chip (300).
4. The automatic adjusting device according to claim 1, further comprising a detection display device (140), wherein the detection display device (140) is connected to the data processor (130) to display the waveform of the second alternating current signal.
5. An auto-adjustment method of a common voltage using the auto-adjustment device of any one of claims 1 to 4 for determining an optimal common voltage value when a display panel (200) displays a picture, the display panel (200) being connected to a signal source (400) for receiving a picture signal and to a power chip (300) for displaying a picture at the common voltage supplied from the power chip (300), the auto-adjustment method comprising the steps of:
s1, outputting an initial common voltage by the power supply chip (300);
s2, obtaining a first alternating current signal through photoelectric conversion;
s3, obtaining a second alternating current signal through waveform processing;
s4, controlling the power supply chip (300) to adjust the public voltage, measuring the corresponding flicker degree of the display picture according to the second alternating current signal, and determining the optimal public voltage value when the flicker degree of the display picture is minimum; acquiring a plurality of voltage values of the second alternating current signal through analog-to-digital conversion to determine the maximum value and the minimum value of the second alternating current signal, and calculating the flicker degree of a display picture through a calculation formula (1):
Flicker(FMA)＝(Vmax-Vmin)/((Vmax+Vmin)/2)x100％ (1)
in the formula, flicker (FMA) is the Flicker degree of the display screen, and Vmax and Vmin are respectively the maximum value and the minimum value of the second alternating current signal;
wherein, the step of controlling the power supply chip (300) to adjust the common voltage and measuring the corresponding flicker degree of the display screen comprises the following steps:
s41, controlling the power supply chip (300) to adjust the public voltage in the forward direction;
s42, judging whether the flicker degree of the display picture is reduced or not;
s43, if yes, controlling the power supply chip (300) to keep the positive adjustment of the common voltage, and adjusting the change amplitude of the common voltage according to the flicker degree of the display picture;
s44, if not, controlling the power supply chip (300) to change into a reverse adjustment common voltage, and adjusting the change amplitude of the common voltage according to the flicker degree of the display picture;
and S45, when the flicker degree of the picture to be displayed is minimum, obtaining the optimal common voltage value.
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