CN111443754B - Gamma voltage output circuit, gamma voltage output module, calibration method, calibration device and display device - Google Patents
Gamma voltage output circuit, gamma voltage output module, calibration method, calibration device and display device Download PDFInfo
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- CN111443754B CN111443754B CN202010262998.8A CN202010262998A CN111443754B CN 111443754 B CN111443754 B CN 111443754B CN 202010262998 A CN202010262998 A CN 202010262998A CN 111443754 B CN111443754 B CN 111443754B
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- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
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- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
Abstract
The invention provides a gamma voltage output circuit and a module, a calibration method and a device, and a display device, wherein the circuit comprises: the first divider resistor string comprises an input end, a plurality of first output nodes and a plurality of first resistors connected in series, the input end of the first divider resistor string is connected with the reference voltage input end, and each first output node is used for outputting a first gray scale binding point voltage; and the second voltage-dividing resistor string comprises an input end, a plurality of second output nodes and a plurality of second resistors connected in series, the input end of the second voltage-dividing resistor string is connected with the reference voltage input end, each second output node is correspondingly connected between two adjacent first output nodes of the first voltage-dividing resistor string, and each second output node is used for outputting a second gray scale binding point voltage. According to the gamma voltage output circuit provided by the embodiment of the invention, a plurality of gray scale binding point voltages can be generated and output, and the time spent on gamma calibration is reduced while the display effect is ensured.
Description
Technical Field
The invention relates to the technical field of display, in particular to a gamma voltage output circuit, a gamma voltage output module, a calibration method, a calibration device and a display device.
Background
An AMOLED (Active-matrix Organic Light-Emitting Diode) is expected to become a new generation of Display technology after an LCD (Liquid Crystal Display) due to its advantages of self-luminescence, low power consumption, high contrast, wide viewing angle, flexibility, and the like.
When the AMOLED correctly displays a multi-color picture, gamma calibration is required. In the process of gamma calibration of the display, the number and the positions of the binding points determine the gamma calibration time and the display effect. Reducing the number of gamma binding points is beneficial to reducing the gamma calibration time, but can reduce the image quality, so how to realize the display effect and reduce the gamma calibration time is very important.
Disclosure of Invention
In view of the above, the present invention provides a gamma voltage output circuit and module, a calibration method and device, and a display device, so as to solve the problem that the prior art cannot meet the requirement of reducing the gamma calibration time while ensuring the display effect.
In order to solve the technical problem, the invention adopts the following technical scheme:
an embodiment of an aspect of the present invention provides a gamma voltage output circuit, including: the first voltage-dividing resistor string and the second voltage-dividing resistor string are arranged in parallel; wherein the content of the first and second substances,
the first divider resistor string comprises an input end, a plurality of first output nodes and a plurality of first resistors connected in series, the input end of the first divider resistor string is connected with a reference voltage input end, at least one first resistor is arranged between the adjacent first output nodes, and each first output node is used for outputting a first gray scale binding point voltage;
the second voltage-dividing resistor string comprises an input end, a plurality of second output nodes and a plurality of second resistors connected in series, the input end of the second voltage-dividing resistor string is connected with the reference voltage input end, each second output node is correspondingly connected between two adjacent first output nodes of the first voltage-dividing resistor string, each second output node is used for outputting a second gray level binding point voltage, and the position of each second output node is obtained by referring to the positions of the two adjacent first output nodes.
Optionally, the first gray scale binding voltage output by each first output node and the second gray scale binding voltage output by each second output node are amplified by a voltage amplifier.
In another aspect, an embodiment of the invention further provides a gamma voltage output module, which includes the gamma voltage output circuit as described in any one of the above.
Optionally, the method further includes:
the output end of the reference voltage module is connected with the input ends of the first voltage-dividing resistor string and the second voltage-dividing resistor string, and the reference voltage module is used for inputting reference voltage to the first voltage-dividing resistor string.
Another embodiment of the present invention provides a gamma voltage calibration method applied to the gamma voltage output circuit as described in any one of the above, the method including:
inputting a reference voltage to a gamma voltage output circuit so that a plurality of first output nodes on a first divider resistor string in the gamma voltage output circuit output a plurality of first gray scale tie voltages;
outputting the first gray scale binding voltage to pixel units of a display panel one by one;
and judging whether the brightness of the pixel unit of the display panel and the first gray scale binding point voltage meet a preset relation or not, and if not, adjusting the position of the first output node until the preset relation is met.
Optionally, the method further includes:
calculating a second gray scale binding voltage between two first gray scale binding voltages generated by any two adjacent first output nodes on the first divider resistor string;
adjusting a position of a second output node on a second voltage-dividing resistor string in the gamma voltage output circuit to output the second gray-scale binding voltage.
Optionally, the method further includes:
and calculating the rest gray scale voltages according to the calibrated first gray scale binding voltage and the calibrated second gray scale binding voltage.
Optionally, before outputting the first grayscale binding voltage to the pixel units of the display panel one by one, the method further includes:
and amplifying the first gray scale tie point voltage by using a voltage amplifier.
In another aspect, an embodiment of the present invention further provides a gamma voltage calibration apparatus, including:
the first gray scale binding voltage module is used for inputting reference voltage to the gamma voltage output circuit so as to enable a plurality of first output nodes on a first voltage dividing resistor string in the gamma voltage output circuit to output a plurality of first gray scale binding voltages;
the first output module is used for outputting the first gray scale binding voltage to the pixel units of the display panel one by one;
the first adjusting module is used for judging whether the brightness of the pixel unit of the display panel and the first gray scale binding voltage meet a preset relation or not, and if not, adjusting the position of the first output node until the preset relation is met.
In another aspect, the present invention also provides a display device, which includes the gamma voltage calibration device as described above.
The technical scheme of the invention has the following beneficial effects:
according to the gamma voltage output circuit provided by the embodiment of the invention, a plurality of gray scale binding point voltages can be generated and output, and the time spent on gamma calibration is reduced while the display effect is ensured.
Drawings
FIG. 1 is a diagram illustrating a gray scale-voltage output curve in a gamma calibration according to the related art;
FIG. 2 is a schematic diagram of a gamma voltage output circuit in the related art;
FIG. 3 is a schematic diagram of a gamma voltage output circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a gray scale-voltage output curve in gamma calibration according to an embodiment of the present invention;
FIG. 5 is a flowchart illustrating a gamma voltage calibration method according to an embodiment of the present invention;
FIG. 6 is a diagram of a gamma voltage calibration apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It should be apparent that the described embodiments are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic diagram illustrating a gray scale-voltage output curve in gamma calibration in the related art. As shown in fig. 1, in the related art, when the AMOLED correctly displays the color and brightness of a picture, the gamma 2.2 curve relationship between the gray scale and the brightness needs to be satisfied; the voltage values of all the binding points are determined through the existing gamma voltage ranges VREGOUT-VGS, and then the gray scale voltage values among the binding points are determined through a linear interpolation mode among the binding points.
Referring to fig. 2, fig. 2 is a schematic diagram illustrating a structure of a gamma voltage output circuit in the related art. As shown in fig. 2, in the related art, the gamma voltage output circuit needs to determine a greater number of binding points (255gray, 207gray, 189gray, 155gray, 128gray, 107gray, 93gray … … 17gray, 3gray, 0gray), and then divide the voltages between the adjacent binding points by using resistance linear interpolation to obtain gray voltages, such as V235 ═ V207+28/48 (V255-V207).
However, in order to adapt to the possibility of mass production, the number of gamma bindings needs to be reduced as much as possible to shorten the gamma calibration time; more gray scale voltages are required to be obtained through interpolation under the condition of less gamma binding point number, and a satisfactory screen display effect is difficult to obtain.
Accordingly, an embodiment of the invention provides a gamma voltage output circuit. Referring to fig. 3, fig. 3 is a schematic structural diagram of a gamma voltage output circuit according to an embodiment of the invention. As shown in fig. 3, the gamma voltage output circuit may include a first voltage-dividing resistor string 31 and a second voltage-dividing resistor string 32 arranged in parallel, wherein the first voltage-dividing resistor string 31 includes an input terminal, a plurality of first output nodes and a plurality of first resistors connected in series, specifically, the input terminal of the first voltage-dividing resistor string 31 is connected to a reference voltage input terminal, and at least one first resistor is arranged between adjacent first output nodes, so that the first voltage-dividing resistor string 31 divides an input reference voltage, and each first output node may be configured to output a first gray-level tie point voltage; more specifically, two ends of the first voltage dividing resistor string 31 are respectively connected to the reference voltages VGS and vregut, and the gamma voltage range is defined between vregut and VGS; the first resistor can be a physically independent resistor, or a segment of a long resistor, or a resistor formed by connecting a plurality of sub-resistors in series; at least one first resistor is arranged between the adjacent first output nodes, and of course, two first resistors or a plurality of first resistors can also be arranged; each first output node may output a first gray-scale binding voltage, the first output nodes at different positions on the first voltage-dividing resistor string 31 output different first gray-scale binding voltages, and when the position of the first output node on the first voltage-dividing resistor string 1 changes, the value of the first gray-scale binding voltage output by the first output node changes accordingly. Therefore, a plurality of first gray scale binding point voltages can be output through the first divider resistor string 31 in the gamma voltage output circuit, and in the gamma calibration process, the position of the first output node after the gamma calibration is obtained by detecting whether the brightness of the pixel unit of the display panel and the first gray scale binding voltage satisfy a preset relationship (such as a gamma 2.2 curve), and then adjusting the position of the first output node, so that the first output node can output the first gray scale binding point voltages satisfying the preset relationship, and the positions of a plurality of first output nodes on the first divider resistor string 31 are determined, that is, the first gray scale binding point voltages output corresponding to each first output node are determined. The plurality of first gray scale binding voltages output by the first output nodes of the first divider resistor string 31 are voltages corresponding to some gray scale bindings in the plurality of gray scale bindings to be calibrated, so that the time for calibrating the rest gray scale bindings is saved, and the production efficiency is improved.
In the embodiment of the present invention, the second voltage-dividing resistor string 32 includes an input end, a plurality of second output nodes, and a plurality of second resistors connected in series, specifically, the input end of the second voltage-dividing resistor string 32 is connected to the reference voltage input end, each second output node is correspondingly connected between two adjacent first output nodes of the first voltage-dividing resistor string 31, and each second output node can be used for outputting a second gray-level tie-point voltage; more specifically, two ends of the second voltage-dividing resistor string 32 are also connected to VGS and vreguout, respectively, and the gamma voltage range is defined between vreguout and VGS; the second resistor can also be a physically independent resistor, or a segment of a long resistor, or a resistor formed by connecting a plurality of sub-resistors in series; each second output node is correspondingly connected between two adjacent first output nodes of the first voltage-dividing resistor string 31, for example, the second output node outputting the second gray-scale binding voltage V189 is connected between the first output node outputting the first gray-scale binding voltage V207 and the first output node outputting the first gray-scale binding voltage V155 of the first voltage-dividing resistor string 31, and for example, the second output node outputting the second gray-scale binding voltage V128 is connected between the first output node outputting the first gray-scale binding voltage V155 of the first voltage-dividing resistor string 31 and the first output node outputting the first gray-scale binding voltage V93 of the first voltage-dividing resistor string 31, that is, the position of the second output node on the second voltage-dividing resistor string 32 is obtained by referring to the positions of two adjacent first output nodes on the first voltage-dividing resistor string 31, and optionally, two adjacent second output nodes may simultaneously refer to the same two adjacent first output nodes on the first voltage-dividing resistor string 31 Obtaining the position of an output node; since the first divider resistor string 31 already determines the plurality of first gray-scale binding voltages through gamma calibration, that is, the positions of the plurality of first output nodes on the first divider resistor string 31 are determined, the second divider resistor string 32 can output the remaining gray-scale binding voltages according to the positions of the plurality of first output nodes determined on the first divider resistor string 31, that is, since the positions of the second output nodes on the second divider resistor string 32 are obtained by referring to the positions of the plurality of first output nodes on the first divider resistor string 31, the accuracy of the second gray-scale binding voltages output by the second output nodes of the second divider resistor string 32 is ensured, and the calibration of the gray-scale binding voltages is not required again, so that the calibration time is saved while the display effect of the display panel is ensured. In other words, the second gray-scale binding voltages required to be output by the second output nodes of the second voltage-dividing resistor string 32 can be obtained by linear interpolation calculation from the determined first gray-scale binding voltages, so that the gray-scale binding voltages can be obtained in less gamma calibration time.
Referring to fig. 4, fig. 4 is a schematic diagram illustrating a gray scale-voltage output curve in gamma calibration according to an embodiment of the invention. As shown in fig. 4, after the gamma voltage output circuit of the embodiment of the present invention is used to output the gray level binding voltage for calibration, a similar curve relationship between the gray level and the brightness is obtained, which indicates that after the gamma voltage output circuit of the embodiment of the present invention is used for calibration, the display effect of the display panel is almost unchanged, that is, the display effect after calibration is ensured under the condition of reducing the calibration time.
In some embodiments of the present invention, the first gray scale binding voltage output by each of the first output nodes of the first voltage dividing resistor string 31 and the second gray scale binding voltage output by each of the second output nodes of the second voltage dividing resistor string 32 are amplified by a voltage amplifier, so as to ensure the stability and accuracy of the output first gray scale binding voltage and second gray scale binding voltage.
The gamma voltage output circuit of the embodiment of the invention can generate and output a plurality of gray scale binding point voltages, and reduces the time spent on gamma calibration while ensuring the display effect.
In another aspect, an embodiment of the present invention further provides a gamma voltage output module, which includes the gamma voltage output circuit as described in any of the above embodiments.
In some embodiments of the present invention, the gamma voltage output module further comprises:
the output end of the reference voltage module is connected with the input ends of the first voltage-dividing resistor string and the second voltage-dividing resistor string, the reference voltage module is used for inputting reference voltage to the first voltage-dividing resistor string, and the range of gray scale binding point voltage which can be output by the first voltage-dividing resistor string and the second voltage-dividing resistor string is limited in the range of the reference voltage.
Since the gamma voltage output circuit in the above embodiment has the above beneficial effects, the gamma voltage output module in the embodiment of the present invention also has the above beneficial effects, which are not described herein again.
Referring to fig. 5, fig. 5 is a schematic flowchart illustrating a gamma voltage calibration method according to an embodiment of the invention. As shown in fig. 5, another embodiment of the invention further provides a gamma voltage calibration method, which is applied to the gamma voltage output circuit according to any of the above embodiments, and the method may include:
step 501: inputting a reference voltage to a gamma voltage output circuit so that a plurality of first output nodes on a first divider resistor string in the gamma voltage output circuit output a plurality of first gray scale tie voltages;
in this step, the reference voltage within the range from vreguut to VGS is input to the gamma voltage output circuit, so that the first voltage-dividing resistor string 31 is used to divide the input reference voltage, so that the plurality of first output nodes on the first voltage-dividing resistor string 31 can output a plurality of first gray-scale binding voltages, of course, the position of the first output node can be adjusted, and when the position of the first output node changes, the value of the first gray-scale binding voltage output by the first output node changes accordingly.
Step 502: outputting the first gray scale binding voltage to pixel units of a display panel one by one;
in this step, the first gray scale tie voltage output by each first output node is output to the pixel units of the display panel one by one to light up the pixel units of the display panel.
Step 503: and judging whether the brightness of the pixel unit of the display panel and the first gray scale binding point voltage meet a preset relation or not, and if not, adjusting the position of the first output node until the preset relation is met.
In this step, the brightness of the pixel unit of the display panel after being lighted is detected by an optical instrument, to determine whether the brightness of the pixel unit of the display panel and the first gray level binding voltage satisfy a predetermined relationship (e.g. a gamma value of 2.2), when the predetermined relationship is satisfied, that is, the first gray level binding voltage outputted from the gamma output circuit is considered to be satisfactory, and when the predetermined relationship is not satisfied, the position of the first output node on the first divider resistor string 31 needs to be adjusted until the output first gray level binding voltage satisfies the preset relationship, so as to complete the calibration of the first gray level binding voltage, that is, the position of the first output node on the first divided resistor string 31 is determined, and the above steps are repeated to sequentially complete the calibration of each first gray-scale binding voltage, thereby determining the position of each first output node on the first divided resistor string 31. The plurality of first gray scale binding voltages output by the first output nodes of the first divider resistor string 31 are voltages corresponding to some gray scale bindings in the plurality of gray scale bindings to be calibrated, so that the time for calibrating the rest gray scale bindings is saved, and the production efficiency is improved.
In some embodiments of the invention, the calibration method further comprises:
calculating a second gray scale binding voltage between two first gray scale binding voltages generated by any two adjacent first output nodes on the first divider resistor string;
adjusting a position of a second output node on a second voltage-dividing resistor string in the gamma voltage output circuit to output the second gray-scale binding voltage.
Specifically, after the position of the first output node on the first voltage-dividing resistor string 31 is determined, a second gray-scale binding voltage between two first gray-scale binding voltages generated by any two adjacent first output nodes on the first voltage-dividing resistor string 31, that is, a second gray-scale binding voltage required to be output by the corresponding second output node on the second voltage-dividing resistor string 31, may be calculated according to the two first gray-scale binding voltages generated by any two adjacent first output nodes on the first voltage-dividing resistor string 31A voltage; illustratively, a second gray-scale binding voltage required to be output by a second output node of the second voltage-dividing resistor string 31
A second gray scale binding voltage required to be output by another second output node
A second gray scale binding voltage required to be output by a second output node
That is to say, the position of each second output node on the second divider resistor string 32 can be obtained by referring to the positions of the plurality of first output nodes on the first divider resistor string 31, and the second gray-scale binding voltage required to be output by each second output node of the second divider resistor string 32 can be obtained by linear interpolation calculation through the determined first gray-scale binding voltage, so that the accuracy of the second gray-scale binding voltage output by each second output node of the second divider resistor string 32 is ensured, and the gray-scale binding voltages do not need to be calibrated again, so that each gray-scale binding voltage is obtained within less gamma calibration time, the display effect of the display panel is ensured, and meanwhile, the calibration time is saved.
In other embodiments of the present invention, the calibration method further comprises:
and calculating the rest gray scale voltages according to the calibrated first gray scale binding voltage and the calibrated second gray scale binding voltage.
That is, according to the calibrated first gray level binding voltage and the calibrated second gray level binding voltage, other gray level voltages can be calculated by linear interpolation, for example:
thereby completing the determination of all gray scale voltages.
In other embodiments of the present invention, before outputting the first gray-scale binding voltage to the pixel units of the display panel one by one, the method further includes:
and amplifying the first gray scale binding voltage by using a voltage amplifier.
The voltage amplifier amplifies the output first gray scale binding voltage, so that the stability and accuracy of the output first gray scale binding voltage can be ensured.
The gamma voltage calibration method of the embodiment of the invention can generate and output a plurality of gray scale binding point voltages, obtain the binding point voltages of the other gray scales through the first interpolation calculation, and obtain the voltages of the other gray scales through the second interpolation calculation, thereby ensuring the display effect and reducing the time spent on gamma calibration.
Referring to fig. 6, fig. 6 is a schematic diagram of a gamma voltage calibration apparatus according to an embodiment of the invention. As shown in fig. 6, another embodiment of the present invention further provides a gamma voltage calibration apparatus, where the calibration apparatus 60 may include:
a first gray level tie voltage module 61, configured to input a reference voltage to the gamma voltage output circuit, so that a plurality of first output nodes on a first voltage dividing resistor string in the gamma voltage output circuit output a plurality of first gray level tie voltages;
a first output module 62, configured to output the first grayscale binding voltage to the pixel units of the display panel one by one;
and the first adjusting module 63 is configured to determine whether a preset relationship is satisfied between the brightness of the pixel unit of the display panel and the first gray scale binding voltage, and if not, adjust the position of the first output node until the preset relationship is satisfied.
Optionally, the calibration device 60 further includes:
the second gray scale binding voltage module is used for calculating a second gray scale binding voltage between two first gray scale binding voltages according to the two first gray scale binding voltages generated by any two adjacent first output nodes on the first divider resistor string;
and the second adjusting module is used for adjusting the position of a second output node on a second voltage dividing resistor string in the gamma voltage output circuit so as to output the second gray level binding point voltage.
Optionally, the calibration device 60 further includes:
and the gray scale voltage calculation module is used for calculating the rest gray scale voltages according to the calibrated first gray scale binding voltage and the calibrated second gray scale binding voltage.
Optionally, the calibration apparatus further includes:
and the amplifying module is used for amplifying the first gray scale binding voltage by using a voltage amplifier.
The gamma voltage calibration device provided by the embodiment of the invention can generate and output a plurality of gray scale binding point voltages, obtain the rest gray scale binding point voltages through the first interpolation calculation, and obtain other gray scale voltages through the second interpolation calculation, thereby ensuring the display effect and reducing the time spent on gamma calibration.
In another embodiment of the present invention, a display device is provided, which includes the gamma voltage calibration apparatus as described in the above embodiments. Since the gamma voltage calibration device in the above embodiment has the above beneficial effects, the display device in the embodiment of the present invention also has the above beneficial effects, and details are not repeated herein.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A gamma voltage output circuit, comprising: the first voltage-dividing resistor string and the second voltage-dividing resistor string are arranged in parallel; wherein the content of the first and second substances,
the first divider resistor string comprises an input end, a plurality of first output nodes and a plurality of first resistors connected in series, the input end of the first divider resistor string is connected with a reference voltage input end, at least one first resistor is arranged between the adjacent first output nodes, and each first output node is used for outputting a first gray scale binding point voltage;
the second voltage-dividing resistor string comprises an input end, a plurality of second output nodes and a plurality of second resistors connected in series, the input end of the second voltage-dividing resistor string is connected with the reference voltage input end, each second output node is correspondingly connected between two adjacent first output nodes of the first voltage-dividing resistor string, each second output node is used for outputting a second gray level binding point voltage, and the position of each second output node is obtained by referring to the positions of the two adjacent first output nodes.
2. The gamma voltage output circuit according to claim 1, wherein the first gray scale binding voltage output from each of the first output nodes and the second gray scale binding voltage output from each of the second output nodes are amplified by voltage amplifiers.
3. A gamma voltage output module comprising the gamma voltage output circuit according to any one of claims 1 to 2.
4. The gamma voltage output module of claim 3, further comprising:
the output end of the reference voltage module is connected with the input ends of the first voltage-dividing resistor string and the second voltage-dividing resistor string, and the reference voltage module is used for inputting reference voltage to the first voltage-dividing resistor string.
5. A gamma voltage calibration method applied to the gamma voltage output circuit according to any one of claims 1 to 2, the method comprising:
inputting a reference voltage to a gamma voltage output circuit so that a plurality of first output nodes on a first divider resistor string in the gamma voltage output circuit output a plurality of first gray scale tie voltages;
outputting the first gray scale binding voltage to pixel units of a display panel one by one;
and judging whether the brightness of the pixel unit of the display panel and the first gray scale binding point voltage meet a preset relation or not, and if not, adjusting the position of the first output node until the preset relation is met.
6. The gamma voltage calibration method of claim 5, further comprising:
calculating a second gray scale binding voltage between two first gray scale binding voltages generated by any two adjacent first output nodes on the first divider resistor string;
adjusting a position of a second output node on a second voltage-dividing resistor string in the gamma voltage output circuit to output the second gray-scale binding voltage.
7. The gamma voltage calibration method of claim 6, further comprising:
and calculating the rest gray scale voltages according to the calibrated first gray scale binding voltage and the calibrated second gray scale binding voltage.
8. The gamma voltage calibration method according to claim 5, wherein before outputting the first gray level tie voltage to the pixel units of the display panel one by one, further comprising:
and amplifying the first gray scale binding voltage by using a voltage amplifier.
9. A gamma voltage calibration device, comprising:
a first gray level tie voltage module for inputting a reference voltage to a gamma voltage output circuit so that a plurality of first output nodes on a first voltage dividing resistor string in the gamma voltage output circuit output a plurality of first gray level tie voltages, the gamma voltage output circuit being the gamma voltage output circuit of claim 1;
the first output module is used for outputting the first gray scale binding voltage to pixel units of a display panel one by one;
the first adjusting module is used for judging whether the brightness of the pixel unit of the display panel and the first gray scale binding voltage meet a preset relation or not, and if not, adjusting the position of the first output node until the preset relation is met.
10. A display device comprising the gamma voltage calibration device according to claim 9.
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| KR20140091395A (en) * | 2013-01-11 | 2014-07-21 | 엘지디스플레이 주식회사 | Gamma voltage generator and liquid crystal display having the same |
| CN108597447A (en) * | 2018-07-09 | 2018-09-28 | 武汉华星光电半导体显示技术有限公司 | A kind of adjustment method and device of display panel gray scale voltage |
| CN110491344A (en) * | 2019-07-30 | 2019-11-22 | 武汉华星光电半导体显示技术有限公司 | For driving the driving chip and display product of display panel |
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