CN111341280A - Driving method, driving board and display device - Google Patents
Driving method, driving board and display device Download PDFInfo
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- CN111341280A CN111341280A CN202010261232.8A CN202010261232A CN111341280A CN 111341280 A CN111341280 A CN 111341280A CN 202010261232 A CN202010261232 A CN 202010261232A CN 111341280 A CN111341280 A CN 111341280A
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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
- G09G3/3685—Details of drivers for data electrodes
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
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Abstract
The embodiment of the invention provides a driving method, a driving board and a display device, wherein the driving method is used for driving a source driver of a display panel and comprises the following steps: acquiring at least one gamma voltage and a preset gamma voltage corresponding to the gamma voltage; judging whether the obtained gamma voltages are the same as preset gamma voltages corresponding to the obtained gamma voltages one by one; when the obtained gamma voltages are different from preset gamma voltages corresponding to the gamma voltages one by one, acquiring half-voltage power supply signals and full-voltage power supply signals according to the at least one gamma voltage; and controlling the output of the source driver according to the half-voltage power supply signal, the full-voltage power supply signal and a plurality of gamma voltages generated by a gamma voltage generating circuit. The embodiment of the invention realizes the adaptation of the driving board and the source driver of the display panel.
Description
Technical Field
The present invention relates to display technologies, and in particular, to a driving method, a driving board, and a display device.
Background
With the development of electronic products, the application of Display devices such as Thin Film transistor liquid Crystal Display (TFT-LCD) devices has become more mature.
When a user watches a display screen of a display device, because human eyes feel different from actual video data, the luminance and gray scale curves of the display screen are not equal straight lines, and different Gamma (Gamma) curves exist for different display devices.
Generally, a set of P-Gamma values (gray scale voltages) is temporarily stored in a driving board of a display panel, and the P-Gamma values are debugged in a design stage, but due to differences in manufacturing processes, the P-Gamma values are difficult to be simultaneously applied to each batch of display panels, which easily causes differences in optical characteristics of different display panels, and even deviations from a set value.
Disclosure of Invention
The embodiment of the invention provides a driving method, a driving board and a display device, which are used for realizing the adaptation of the driving board and a source driver of a display panel.
In a first aspect, an embodiment of the present invention provides a driving method for driving a source driver of a display panel, including:
acquiring at least one gamma voltage and a preset gamma voltage corresponding to the gamma voltage;
judging whether the obtained gamma voltages are the same as preset gamma voltages corresponding to the obtained gamma voltages one by one;
when the obtained gamma voltages are different from preset gamma voltages corresponding to the gamma voltages one by one, acquiring half-voltage power supply signals and full-voltage power supply signals according to the at least one gamma voltage;
and controlling the output of the source driver according to the half-voltage power supply signal, the full-voltage power supply signal and a plurality of gamma voltages generated by a gamma voltage generating circuit.
Further, the at least one gamma voltage includes nth and (n + 1) th gamma voltages;
when the obtained gamma voltages are different from preset gamma voltages corresponding to the gamma voltages one by one, acquiring half-voltage power signals and full-voltage power signals according to the at least one gamma voltage, comprising:
when the obtained gamma voltages are different from preset gamma voltages corresponding to the gamma voltages, obtaining the half-voltage power supply signal and the full-voltage power supply signal according to the nth and the (n + 1) th gamma voltages;
the gamma voltage generating circuit comprises 2n gamma voltage output ends and generates 2n gamma voltages, wherein n is a positive integer.
Further, when the acquired gamma voltages are different from preset gamma voltages corresponding to the acquired gamma voltages, acquiring the half-voltage power signal and the full-voltage power signal according to the nth and (n + 1) th gamma voltages includes:
when the obtained gamma voltages are different from preset gamma voltages corresponding to the gamma voltages, obtaining the half-voltage power supply signals according to the nth and (n + 1) th gamma voltages;
and acquiring the full-voltage power supply signal according to the half-voltage power supply signal and the relation that the full-voltage power supply signal is 2 times of the half-voltage power supply signal.
Further, before controlling the output of the source driver according to the half-voltage power signal, the full-voltage power signal, and the plurality of gamma voltages generated by the gamma voltage generating circuit, the method further includes:
acquiring 1 st to n-1 st preset gamma voltages and n +2 nd to 2 nth preset gamma voltages;
judging whether the difference value between the full-voltage power supply signal and the 1 st preset gamma voltage is greater than a preset value or not;
when the difference value between the full-voltage power signal and the 1 st preset gamma voltage is smaller than or equal to the preset value, acquiring the 1 st to the n-1 th gamma voltages and the n +2 th to the 2n th gamma voltages according to the full-voltage power signal, the 1 st to the n-1 th preset gamma voltages and the n +2 th to the 2n th preset gamma voltages;
wherein n is greater than 1.
Further, when the difference between the full-voltage power signal and the 1 st preset gamma voltage is less than or equal to the preset value, after obtaining the 1 st to the n-1 th gamma voltages and the n +2 to the 2n gamma voltages according to the full-voltage power signal, the 1 st to the n-1 th preset gamma voltages and the n +2 to the 2n gamma voltages, the method further includes:
the currently acquired nth and (n + 1) th gamma voltages are saved.
In a second aspect, an embodiment of the present invention provides a driving board, a source driver for driving a display panel, including:
a gamma voltage generating circuit including a plurality of gamma voltage output terminals for outputting a plurality of gamma voltages to the source driver;
the processor is electrically connected with the gamma voltage generating circuit and is used for acquiring at least one gamma voltage in real time;
the memory is electrically connected with the processor and is used for storing a preset gamma voltage and the gamma voltage;
a voltage conversion circuit electrically connected to the gamma voltage generation circuit, the processor and the memory; the voltage conversion circuit comprises a first output end and a second output end, and the first output end and the second output end are both electrically connected with the source electrode driver and used for supplying power to the source electrode driver;
the processor is further configured to obtain preset gamma voltages corresponding to the gamma voltages in real time, judge whether the obtained gamma voltages are the same as the preset gamma voltages corresponding to the gamma voltages in a one-to-one manner, and obtain half-voltage power signals and full-voltage power signals according to the at least one gamma voltage when the obtained gamma voltages are different from the preset gamma voltages corresponding to the gamma voltages in a one-to-one manner.
Further, still include:
and the voltage detection circuit is electrically connected with the gamma voltage generation circuit and the processor and is used for acquiring at least one gamma voltage in real time and transmitting the acquired gamma voltage to the processor.
Further, the gamma voltage generating circuit includes 2n gamma voltage output terminals, and the voltage detecting circuit is electrically connected to the nth and (n + 1) th gamma voltage output terminals; wherein n is a positive integer.
Further, the second output terminal is also electrically connected to the gamma voltage generating circuit.
In a third aspect, an embodiment of the present invention provides a display device, including the driving board of the second aspect; and a display panel including a source driver, the driving board being electrically connected with the source driver.
The driving method provided by the embodiment of the invention is used for driving a source driver of a display panel, and comprises the following steps: and acquiring at least one gamma voltage in real time, and correspondingly adjusting the half-voltage power supply signal and the full-voltage power supply signal if the current gamma voltage is different from the preset gamma voltage, so that the currently output gamma voltages are adaptive to the half-voltage power supply signal and the full-voltage power supply signal, and the normal driving condition of the source driver is met. The driving method provided by the embodiment of the invention can realize the adaptation of the driving board and the source driver of the display panel. Furthermore, the embodiment of the invention can also automatically adjust the half-voltage power supply signal and the full-voltage power supply signal, thereby saving time and simplifying the step of installing and debugging the driving board.
Drawings
Fig. 1 is a flowchart of a driving method according to an embodiment of the present invention;
FIG. 2 is a flow chart of another driving method according to an embodiment of the present invention;
FIG. 3 is a flow chart of another driving method according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a driving plate according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be given to specific embodiments, structures, features and effects of a driving method, a driving board and a display device according to the present invention, in conjunction with the accompanying drawings and preferred embodiments.
An embodiment of the present invention further provides a driving method, and fig. 1 is a flowchart of the driving method provided in the embodiment of the present invention, and referring to fig. 1, the driving method includes the following steps:
s110, acquiring at least one gamma voltage and a preset gamma voltage corresponding to the gamma voltage.
Illustratively, the at least one gamma voltage generated by the current gamma voltage generating circuit 10 may be directly obtained by the processor 20, or the at least one gamma voltage generated by the current gamma voltage generating circuit 10 may be obtained by the voltage detecting circuit 50. The preset gamma voltages may be stored in the memory 30 in advance, and when the preset gamma voltages need to be obtained, the preset gamma voltages may be directly obtained from the memory 30.
Illustratively, the 1 st gamma voltage corresponds to the 1 st preset gamma voltage, the 2 nd gamma voltage corresponds to the 2 nd preset gamma voltage, the nth gamma voltage corresponds to the nth preset gamma voltage, the n +1 th gamma voltage corresponds to the n +1 th preset gamma voltage, and the 2 nth gamma voltage corresponds to the 2 nth preset gamma voltage. Wherein n is a positive integer.
And S120, judging whether the acquired gamma voltages are the same as one preset gamma voltage corresponding to the acquired gamma voltages.
For example, whether the gamma voltage corresponds to the preset gamma voltage may be identified by the gamma voltage and an identification of the preset gamma voltage, such as a number or a memory address. Whether the gamma voltage corresponds to the preset gamma voltage can also be identified by the gamma voltage and the voltage value of the preset gamma voltage. For example, if the difference between the gamma voltage and the preset gamma voltage is less than a threshold, it indicates that the gamma voltage corresponds to the preset gamma voltage; otherwise, it indicates that the gamma voltage does not correspond to the preset gamma voltage.
And S130, when the acquired gamma voltages are different from the preset gamma voltages corresponding to the gamma voltages, acquiring half-voltage power supply signals and full-voltage power supply signals according to at least one gamma voltage.
In this step, when the obtained gamma voltages are different from the preset gamma voltages corresponding to the obtained gamma voltages one to one, the preset half-voltage power signals and the preset full-voltage power signals cannot be well adapted to the source driver 210 of the display panel 200 that needs to be driven currently, the half-voltage power signals and the full-voltage power signals need to be adjusted, and the updated half-voltage power signals and the updated full-voltage power signals can be obtained according to at least one gamma voltage.
And S140, controlling the output of the source driver according to the half-voltage power supply signal, the full-voltage power supply signal and the gamma voltages generated by the gamma voltage generating circuit.
The driving method provided by the embodiment of the invention is used for driving the source driver 210 of the display panel 200, and the driving method comprises the following steps: and acquiring at least one gamma voltage in real time, and if the current gamma voltage is different from the preset gamma voltage, correspondingly adjusting the half-voltage power supply signal and the full-voltage power supply signal so that the currently output gamma voltages are adaptive to the half-voltage power supply signal and the full-voltage power supply signal, thereby meeting the normal driving condition of the source driver 210. The driving method provided by the embodiment of the invention can realize the adaptation of the driving board and the source driver of the display panel. Furthermore, the embodiment of the invention can also automatically adjust the half-voltage power supply signal and the full-voltage power supply signal, thereby saving time and simplifying the step of installing and debugging the driving board.
Optionally, on the basis of the above embodiment, the at least one gamma voltage includes nth and n +1 th gamma voltages. When the obtained gamma voltages are different from the preset gamma voltages corresponding to the gamma voltages, acquiring a half-voltage power signal and a full-voltage power signal according to at least one gamma voltage, including (i.e., step S130 may be further optimized as): and when the acquired gamma voltages are different from the preset gamma voltages corresponding to the acquired gamma voltages one by one, acquiring half-voltage power signals and full-voltage power signals according to the nth and (n + 1) th gamma voltages. The gamma voltage generating circuit comprises 2n gamma voltage output ends and generates 2n gamma voltages, wherein n is a positive integer. In the embodiment of the invention, the half-voltage power supply signal and the full-voltage power supply signal which are adapted to the nth gamma voltage and the (n + 1) th gamma voltage are obtained according to the nth gamma voltage and the (n + 1) th gamma voltage, so that the problem of image sticking of the display panel 200 is avoided.
Alternatively, when the acquired gamma voltages are different from the preset gamma voltages corresponding to the acquired gamma voltages, the half-voltage power signal and the full-voltage power signal are acquired according to the nth and (n + 1) th gamma voltages, including (i.e., step S130 may be further optimized as): when the obtained gamma voltages are different from preset gamma voltages corresponding to the gamma voltages one by one, acquiring half-voltage power signals according to the nth and (n + 1) th gamma voltages, and acquiring full-voltage power signals according to the relation that the half-voltage power signals and the full-voltage power signals are 2 times of the half-voltage power signals.
For example, in some possible embodiments, the half-voltage power signal may be obtained according to an average value of the nth and (n + 1) th gamma voltages, that is, the half-voltage power signal is an average value of the nth and (n + 1) th gamma voltages. In other possible embodiments, V may also be a function ofn-0.2≤VHAVDD≤Vn+1The relation of +0.2 acquires a half-voltage power supply signal. Wherein, VnIs the voltage value of the nth gamma voltage, Vn+1Is the voltage value of the (n + 1) th gamma voltage, VHAVDDIs the voltage value of the half-voltage power signal. In other embodiments, the half-voltage power signal may be obtained according to another mathematical relationship between the nth and the (n + 1) th gamma voltages, and the full-voltage power signal may be obtained according to another mathematical relationship between the half-voltage power signal and the full-voltage power signal, which is not limited in this embodiment of the present invention.
Fig. 2 is a flowchart of a driving method according to an embodiment of the present invention, and referring to fig. 2, before controlling the output of the source driver according to the half-voltage power signal, the full-voltage power signal and the plurality of gamma voltages generated by the gamma voltage generating circuit (i.e., step S140), the driving method may further include the following steps:
s131, acquiring the 1 st to the n-1 st preset gamma voltages and the n +2 nd to the 2n th preset gamma voltages.
In this step, the 1 st to n-1 st preset gamma voltages and the n +2 to 2n preset gamma voltages may be obtained from the memory 30. That is, all the preset gamma voltages except the nth and n +1 th preset gamma voltages among the 2n preset gamma voltages are acquired from the memory 30.
S132, judging whether the difference value between the full-voltage power supply signal and the 1 st preset gamma voltage is larger than a preset value or not.
Generally, the 1 st preset gamma voltage is greater than the 2 nd preset gamma voltage, the 2 nd preset gamma voltage is greater than the 3 rd preset gamma voltage, and so on, the nth preset gamma voltage is greater than the n +1 th preset gamma voltage, and the 2n-1 th preset gamma voltage is greater than the 2n th preset gamma voltage. When the difference value between the full-voltage power signal and the 1 st preset gamma voltage is greater than the preset value, the difference values between the 2 nd to 2 nth preset gamma voltages and the full-voltage power signal are all greater than the preset value, so that the 1 st preset gamma voltage and the full-voltage power signal only need to be selected for comparison, and the driving method is simplified. In other embodiments, at least one preset gamma voltage other than the 1 st preset gamma voltage may be selected to be compared with the full-voltage power signal, which is not limited in the embodiment of the present invention.
S133, when the difference value between the full-voltage power signal and the 1 st preset gamma voltage is smaller than or equal to a preset value, the 1 st to the n-1 st gamma voltages and the n +2 to the 2n th preset gamma voltages are obtained according to the full-voltage power signal, the 1 st to the n-1 st preset gamma voltages and the n +2 to the 2n th preset gamma voltages.
In this step, when the difference between the full-voltage power signal and the 1 st preset gamma voltage is less than or equal to the preset value, the 1 st to the n-1 st preset gamma voltages and the n +2 to the 2n preset gamma voltages are recalculated to generate a new version of the 1 st to the n-1 st gamma voltages and the n +2 to the 2n gamma voltages.
Illustratively, when the difference between the full-voltage power signal and the 1 st preset gamma voltage is less than or equal to the preset value, the processor 20 generates a control signal according to the full-voltage power signal, the 1 st to n-1 th preset gamma voltages, the n +2 nd to 2 nd preset gamma voltages, and the coding formula, and transmits the control signal to the gamma voltage generating circuit 10, and the gamma voltage generating circuit 10 generates a new version of the 1 st to n-1 th gamma voltages and the n +2 nd to 2 nd gamma voltages under the control of the control signal and outputs the new version of the 1 st to n-1 th gamma voltages and the n +2 nd to 2 nd gamma voltages to the source driver 210. In this embodiment, since the nth and n +1 th gamma voltages and the gamma voltages other than the nth and n +1 th gamma voltages are included, it is necessary to set n > 1.
In the embodiment of the present invention, on the basis of avoiding the occurrence of the image sticking on the display panel 200, the 1 st to n-1 st gamma voltages and the n +2 nd to 2 nd gamma voltages with good adaptability to the full-voltage power signal are obtained according to the full-voltage power signal, so as to further improve the driving effect on the display panel and increase the adaptability of the driving board to the source driver 210 of the display panel 200.
Fig. 3 is a flowchart of a driving method according to an embodiment of the present invention, and referring to fig. 3, the driving method includes the following steps:
s201, starting.
S202, acquiring the nth and the (n + 1) th preset gamma voltages.
S203, acquiring the currently detected nth and (n + 1) th gamma voltages.
S204, judging whether the nth gamma voltage and the nth preset gamma voltage, and the (n + 1) th gamma voltage and the (n + 1) th preset gamma voltage are the same.
In this step, it is determined whether the nth gamma voltage is the same as the nth preset gamma voltage, and it is determined whether the (n + 1) th gamma voltage is the same as the (n + 1) th preset gamma voltage. If so (i.e., the nth gamma voltage is the same as the nth preset gamma voltage, and the (n + 1) th gamma voltage is the same as the (n + 1) th preset gamma voltage), step S203 is performed. If not (i.e., the nth gamma voltage is the same as the nth preset gamma voltage, and the (n + 1) th gamma voltage is different from the (n + 1) th preset gamma voltage, or the nth gamma voltage is different from the nth preset gamma voltage, and the (n + 1) th gamma voltage is the same as the (n + 1) th preset gamma voltage, or the nth gamma voltage is different from the nth preset gamma voltage, and the (n + 1) th gamma voltage is different from the (n + 1) th preset gamma voltage), step S205 is executed.
S205, acquiring a half-voltage power supply signal according to the average value of the nth and the (n + 1) th gamma voltages, and acquiring a full-voltage power supply signal according to the relation that the half-voltage power supply signal and the full-voltage power supply signal are 2 times of the half-voltage power supply signal.
In other possible embodiments, this step can be replaced by: according to Vn-0.2≤VHAVDD≤Vn+1The relation of +0.2 obtains a half-voltage power supply signal, and the relation that a full-voltage power supply signal is 2 times of the half-voltage power supply signal obtains the full-voltage power supply signal. Wherein, VnIs the voltage value of the nth gamma voltage, Vn+1Is the voltage value of the (n + 1) th gamma voltage, VHAVDDIs the voltage value of the half-voltage power signal.
S206, acquiring the 1 st to the n-1 st preset gamma voltages and the n +2 nd to the 2n th preset gamma voltages.
S207, judging whether the difference value between the full-voltage power supply signal and the 1 st preset gamma voltage is larger than a preset value.
In this step, if yes, go to step S203; if not, go to step S208.
S208, acquiring the 1 st to the n-1 st gamma voltages and the n +2 nd to the 2n nd gamma voltages according to the full-voltage power signal, the 1 st to the n-1 st preset gamma voltages and the n +2 nd to the 2n nd preset gamma voltages.
S209, storing the currently acquired nth and (n + 1) th gamma voltages.
In this step, the currently acquired nth and (n + 1) th gamma voltages may be stored in the memory 30.
Fig. 4 is a schematic structural diagram of a driving board according to an embodiment of the present invention, configured to perform the driving method in the foregoing embodiment, and it should be noted that, in order to facilitate a fuller understanding of the function of the driving board, fig. 4 also illustrates a display panel and a source driver in the display panel, where the driving board is used to drive the source driver 210 of the display panel 200, and the display panel 200 may be, for example, a liquid crystal display panel or an organic light emitting display panel. The source driver 210 is generally located in the non-display region of the display panel 200 and electrically connected to data lines (not shown in fig. 4) in the display panel 200 for providing data signals to the pixels arranged in the array in the display panel 200.
Referring to fig. 4, the driving board includes a gamma voltage generating circuit 10, a processor 20, a memory 30, and a voltage converting circuit 40. The gamma voltage generating circuit 10 includes a plurality of gamma voltage output terminals, and the gamma voltage generating circuit 10 is configured to output the gamma voltages output from the plurality of gamma voltage output terminals to the source driver 210. The processor 20 is electrically connected to the gamma voltage generating circuit 10 for obtaining at least one gamma voltage in real time. The memory 30 is electrically connected to the processor 20 and is used for storing a preset gamma voltage and a gamma voltage. Wherein the preset gamma voltage is an approximate value of a normal gamma voltage suitable for the normal source driver. The voltage conversion circuit 40 is electrically connected to the gamma voltage generation circuit 10, the processor 20 and the memory 30, and the voltage conversion circuit 40 supplies power to the gamma voltage generation circuit 10, the processor 20 and the memory 30 electrically connected thereto. The input of the voltage conversion circuit 40 may be electrically connected to a power source (not shown in fig. 4), such as a removable or non-removable battery, or a transformed mains. The voltage conversion circuit 40 includes a first output terminal HAVDD (the first output terminal HAVDD outputs a half-voltage power signal) and a second output terminal AVDD (the second output terminal AVDD outputs a full-voltage power signal), both of which are electrically connected to the source driver 210, and the first output terminal HAVDD and the second output terminal AVDD are used for supplying power to the source driver 210, that is, the first output terminal HAVDD and the second output terminal AVDD are used as power supply terminals of the source driver 210. The processor 20 is further configured to obtain preset gamma voltages corresponding to the gamma voltages in real time, determine whether the obtained gamma voltages are the same as the preset gamma voltages corresponding to the gamma voltages, and obtain half-voltage power signals and full-voltage power signals according to at least one gamma voltage when the obtained gamma voltages are different from the preset gamma voltages corresponding to the gamma voltages.
Illustratively, referring to fig. 4, the gamma voltage generating circuit 10 includes 2n gamma voltage output terminals, which are a 1 st gamma voltage output terminal, a 2 nd gamma voltage output terminal, … …, an nth gamma voltage output terminal, an n +1 th gamma voltage output terminal, … …, and a 2 nth gamma voltage output terminal, respectively, where n is a positive integer. The 1 st gamma voltage generated by the gamma voltage generating circuit 10 may be transferred from the 1 st gamma voltage output terminal to the source driver 210, and similarly, the nth gamma voltage generated by the gamma voltage generating circuit 10 may be transferred from the nth gamma voltage output terminal to the source driver 210, the (n + 1) th gamma voltage generated by the gamma voltage generating circuit 10 may be transferred from the (n + 1) th gamma voltage output terminal to the source driver 210, and the (2 n) th gamma voltage generated by the gamma voltage generating circuit 10 may be transferred from the 2 nth gamma voltage output terminal to the source driver 210. In other embodiments, the gamma voltage generating circuit 10 may also generate odd number of gamma voltages, which is not limited in the embodiment of the invention.
Illustratively, referring to fig. 4, the voltage conversion circuit 40 includes a first power supply output terminal 41, a second power supply output terminal 42, a fourth power supply output terminal 44, and a fifth power supply output terminal 45. The first power output terminal 41 is electrically connected to the memory 30, and the first power output terminal 41 supplies power to the memory 30 electrically connected thereto. The second power output 42 is electrically connected to the processor 20, and the second power output 42 provides power to the processor 20 electrically connected thereto. The fourth power output terminal 44 is electrically connected to the gamma voltage generating circuit 10, and the fourth power output terminal 44 supplies power to the gamma voltage generating circuit 10 electrically connected thereto. The fifth power output terminal 45 is electrically connected to the display panel 200, and the fifth power output terminal 45 supplies power to the display panel 200 electrically connected thereto.
The driving board provided by the embodiment of the present invention is used for driving the source driver 210 of the display panel 200, and includes a gamma voltage driving circuit 10, a processor 20, a memory 30, and a voltage converting circuit 40. The processor 20 obtains at least one gamma voltage in real time, that is, the processor 20 obtains at least one gamma voltage currently output by the gamma voltage driving circuit 10 in real time, and if the gamma voltage currently output by the gamma voltage driving circuit 10 is different from a preset gamma voltage stored in the memory 30 and corresponding to the currently output gamma voltage, adjusts the half-voltage power signal output by the first output terminal HAVDD and the full-voltage power signal output by the second output terminal AVDD accordingly, so that the multiple gamma voltages currently output are adapted to the half-voltage power signal output by the first output terminal HAVDD and the full-voltage power signal output by the second output terminal AVDD, and the normal driving condition of the source driver 210 is satisfied. The driving board provided by the embodiment of the invention can realize the adaptation of the driving board and the source driver of the display panel.
It should be further explained that the adjustment of the afterimage of the display panel is an important step in the debugging process of the display image of the display panel. In the adjusting process of removing the ghost, if the gamma voltage generating circuit 10 includes 2n gamma voltage output terminals, it is often necessary to adjust the nth gamma voltage output by the nth gamma voltage output terminal and the n +1 st gamma voltage output by the n +1 th gamma voltage output terminal, at this time, in order to make the half-voltage power signal output by the first output terminal HAVDD and the full-voltage power signal output by the second output terminal AVDD adapt to the nth gamma voltage and the n +1 th gamma voltage, it is necessary to synchronously adjust the half-voltage power signal output by the first output terminal HAVDD and the full-voltage power signal output by the second output terminal AVDD. In the conventional design, after the nth gamma voltage output by the nth gamma voltage output terminal and the (n + 1) th gamma voltage output by the (n + 1) th gamma voltage output terminal are adjusted, the half-voltage power signal output by the first output terminal HAVDD and the full-voltage power signal output by the second output terminal AVDD need to be manually adjusted. Since the nth gamma voltage and the (n + 1) th gamma voltage need to be adjusted continuously, codes need to be calculated and burned into the voltage conversion circuit 40 continuously, and the working efficiency is reduced. In the embodiment of the invention, the processor 20 acquires at least one gamma voltage in real time, and automatically adjusts the half-voltage power supply signal output by the first output terminal HAVDD and the full-voltage power supply signal output by the second output terminal AVDD according to the acquired gamma voltage, so that the time is saved, and the step of installing and debugging the driving board is simplified.
Alternatively, referring to FIG. 4, the gamma voltage generation circuit 10, the memory 30, and the voltage conversion circuit 40 are all communicatively coupled (illustrated by the double-headed arrow in FIG. 4) to the processor 20. The communication connection means a communication connection performed in a wired or wireless manner. The communication mode can be serial or parallel communication. The gamma voltage generating circuit 10 and the processor 20 which are electrically connected in communication can communicate with each other to transmit exchange information. The memory 30, the voltage conversion circuit 40 and the processor 20 are electrically connected in communication similar to the gamma voltage generation circuit 10, and are not described herein again.
Alternatively, in some possible embodiments, the at least one gamma voltage may be directly obtained by the processor 20. In other possible embodiments, the at least one gamma voltage may also be obtained indirectly by the processor 20.
Optionally, referring to fig. 4, the driving board further includes a voltage detection circuit 50, and the voltage detection circuit 50 is electrically connected to the gamma voltage generation circuit 10 and the processor 20, and is configured to acquire at least one gamma voltage in real time and transmit the acquired gamma voltage to the processor 20. In the embodiment of the present invention, the processor 20 obtains at least one gamma voltage through the voltage detection circuit 50 electrically connected in communication therewith, and since the gamma voltage is obtained by using the special voltage detection circuit 50, the acquisition precision of the voltage data can be improved.
Illustratively, referring to fig. 4, the voltage conversion circuit 40 further includes a third power supply output terminal 43. The third power output terminal 43 is electrically connected to the voltage detection circuit 50, and the third power output terminal 43 supplies power to the voltage detection circuit 50 electrically connected thereto.
Alternatively, referring to fig. 4, the gamma voltage generating circuit 10 includes 2n gamma voltage output terminals, and the voltage detecting circuit 50 is electrically connected to the nth and (n + 1) th gamma voltage output terminals, where n is a positive integer. The nth and (n + 1) th gamma voltage output terminals refer to the nth and (n + 1) th gamma voltage output terminals. In the debugging process of the display image of the display panel, the adjustment of the afterimage of the display panel is an important step. That is, the driving board needs to be adjusted to prevent the image displayed on the display panel from being ghost. Here, the afterimage is also called image sticking or image sticking, and means that a residual portion of the previous frame image exists in the current frame display image. In the adjusting process of removing the ghost, it is often necessary to use the nth gamma voltage output by the nth gamma voltage output terminal and the (n + 1) th gamma voltage output by the (n + 1) th gamma voltage output terminal to control the source driver 210, so that the display panel 200 generates a color block between black and white. Therefore, in the embodiment of the present invention, the voltage detection circuit 50 is electrically connected to the nth and (n + 1) th gamma voltage output terminals, and the voltage detection circuit 50 can obtain the nth and (n + 1) th gamma voltages (i.e., the nth gamma voltage and the (n + 1) th gamma voltage), so as to obtain the half-voltage power signal and the full-voltage power signal adapted to the nth and (n + 1) th gamma voltages, thereby avoiding the problem of image sticking occurring on the display panel 200.
Alternatively, referring to fig. 4, the second output terminal AVDD is also electrically connected to the gamma voltage generating circuit 10.
Illustratively, the full-voltage power signal output from the second output terminal AVDD is adapted to a plurality of gamma voltages output from a plurality of gamma voltage output terminals of the gamma voltage generating circuit 10. In the embodiments of the present invention, n ═ 6 is taken as an example for explanation, but the present invention is not limited thereto. The 12 gamma voltages generated by the gamma voltage generating circuit 10 are respectively V1, V2, V3, V4, V5, V6, V7, V8, V9, V10, V11 and V12, the full-voltage power supply signal output by the second output terminal AVDD is AVDD0, the voltage ranges of V1-V6 are greater than or equal to 0.5 AVDD0+0.2 and less than or equal to AVDD0-0.2, and the voltage ranges of V7-V12 are greater than or equal to 0.2 and less than or equal to 0.5 AVDD 0-0.2. The unit of voltage is volts (V).
Fig. 5 is a schematic structural diagram of a display device according to an embodiment of the present invention, and referring to fig. 5, the display device includes the driving board 100 and the display panel 200 in the above embodiment, the display panel 200 includes the source driver 210, and the driving board 100 is electrically connected to the source driver 210. The display device may be specifically an electronic device such as a mobile phone and a computer, which is not limited in this embodiment of the present invention. The driving board 100 may be bound to the display panel 200 or disposed on the main board. Since the display device includes the driving board 100 in the above embodiment, the driving board 100 has the beneficial effect that the driving board 100 in the display device is adapted to the source driver 210 of the display panel 200, so that the display yield of the display device is improved.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A driving method for driving a source driver of a display panel, comprising:
acquiring at least one gamma voltage and a preset gamma voltage corresponding to the gamma voltage;
judging whether the obtained gamma voltages are the same as preset gamma voltages corresponding to the obtained gamma voltages one by one;
when the obtained gamma voltages are different from preset gamma voltages corresponding to the gamma voltages one by one, acquiring half-voltage power supply signals and full-voltage power supply signals according to the at least one gamma voltage;
and controlling the output of the source driver according to the half-voltage power supply signal, the full-voltage power supply signal and a plurality of gamma voltages generated by a gamma voltage generating circuit.
2. The driving method according to claim 1, wherein the at least one gamma voltage includes nth and n +1 th gamma voltages;
when the obtained gamma voltages are different from preset gamma voltages corresponding to the gamma voltages one by one, acquiring half-voltage power signals and full-voltage power signals according to the at least one gamma voltage, comprising:
when the obtained gamma voltages are different from preset gamma voltages corresponding to the gamma voltages, obtaining the half-voltage power supply signal and the full-voltage power supply signal according to the nth and the (n + 1) th gamma voltages;
the gamma voltage generating circuit comprises 2n gamma voltage output ends and generates 2n gamma voltages, wherein n is a positive integer.
3. The driving method according to claim 2, wherein acquiring the half-voltage power supply signal and the full-voltage power supply signal from the nth and n + 1-th gamma voltages when the acquired gamma voltages are different from preset gamma voltages one-to-one corresponding thereto comprises:
when the obtained gamma voltages are different from preset gamma voltages corresponding to the gamma voltages, obtaining the half-voltage power supply signals according to the nth and (n + 1) th gamma voltages;
and acquiring the full-voltage power supply signal according to the half-voltage power supply signal and the relation that the full-voltage power supply signal is 2 times of the half-voltage power supply signal.
4. The driving method according to claim 2, further comprising, before controlling the output of the source driver according to the half-voltage power supply signal, the full-voltage power supply signal, and a plurality of gamma voltages generated by a gamma voltage generating circuit:
acquiring 1 st to n-1 st preset gamma voltages and n +2 nd to 2 nth preset gamma voltages;
judging whether the difference value between the full-voltage power supply signal and the 1 st preset gamma voltage is greater than a preset value or not;
when the difference value between the full-voltage power signal and the 1 st preset gamma voltage is smaller than or equal to the preset value, acquiring the 1 st to the n-1 th gamma voltages and the n +2 th to the 2n th gamma voltages according to the full-voltage power signal, the 1 st to the n-1 th preset gamma voltages and the n +2 th to the 2n th preset gamma voltages;
wherein n is greater than 1.
5. The driving method according to claim 4, wherein when the difference between the full-voltage power signal and the 1 st preset gamma voltage is less than or equal to the preset value, after obtaining the 1 st to the n-1 st gamma voltages and the n +2 to the 2n gamma voltages according to the full-voltage power signal, the 1 st to the n-1 st preset gamma voltages and the n +2 to the 2n preset gamma voltages, the method further comprises:
the currently acquired nth and (n + 1) th gamma voltages are saved.
6. A driving board, a source driver for driving a display panel, comprising:
a gamma voltage generating circuit including a plurality of gamma voltage output terminals for outputting a plurality of gamma voltages to the source driver;
the processor is electrically connected with the gamma voltage generating circuit and is used for acquiring at least one gamma voltage in real time;
the memory is electrically connected with the processor and is used for storing a preset gamma voltage and the gamma voltage;
a voltage conversion circuit electrically connected to the gamma voltage generation circuit, the processor and the memory; the voltage conversion circuit comprises a first output end and a second output end, and the first output end and the second output end are both electrically connected with the source electrode driver and used for supplying power to the source electrode driver;
the processor is further configured to obtain preset gamma voltages corresponding to the gamma voltages in real time, judge whether the obtained gamma voltages are the same as the preset gamma voltages corresponding to the gamma voltages in a one-to-one manner, and obtain half-voltage power signals and full-voltage power signals according to the at least one gamma voltage when the obtained gamma voltages are different from the preset gamma voltages corresponding to the gamma voltages in a one-to-one manner.
7. The drive plate of claim 6, further comprising:
and the voltage detection circuit is electrically connected with the gamma voltage generation circuit and the processor and is used for acquiring at least one gamma voltage in real time and transmitting the acquired gamma voltage to the processor.
8. The driving board according to claim 7, wherein the gamma voltage generating circuit includes 2n gamma voltage output terminals, and the voltage detecting circuit is electrically connected to the nth and n +1 th gamma voltage output terminals; wherein n is a positive integer.
9. The driver board according to claim 8, wherein the second output terminal is further electrically connected to the gamma voltage generating circuit.
10. A display device characterized by comprising the driving board of any one of claims 6 to 9; and a display panel including a source driver, the driving board being electrically connected with the source driver.
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