CN112164360A - Display drive circuit and display device - Google Patents
Display drive circuit and display device Download PDFInfo
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- CN112164360A CN112164360A CN202011017533.2A CN202011017533A CN112164360A CN 112164360 A CN112164360 A CN 112164360A CN 202011017533 A CN202011017533 A CN 202011017533A CN 112164360 A CN112164360 A CN 112164360A
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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
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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
- G09G3/2007—Display of intermediate tones
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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
- G09G2320/0257—Reduction of after-image effects
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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
- G09G2320/06—Adjustment of display parameters
- G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
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Abstract
The invention discloses a display driving circuit and a display device, wherein the display driving circuit comprises a digital-to-analog conversion module, an output control module, an image data comparison module and a selection module; the image data comparison module is used for controlling the action of the selection module according to the difference degree of the image data of two adjacent frames so as to select a control circuit which is communicated with the digital-to-analog conversion module in the control unit; when the control circuit communicated with the digital-to-analog conversion module in the control unit is different, the voltage and/or current generated by the display driving circuit and corresponding to the same gray scale output signal are different. The technical scheme of the invention can improve the smear phenomenon of the display panel during low-frequency display.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display driving circuit and a display device.
Background
With the development of display technology, the requirements on the display quality of the picture are higher and higher.
The display panel may generally display a high frequency picture and a low frequency picture. The existing display panel has the problem that the image display quality of the display panel is poor due to the phenomenon of smear when a low-frequency image is displayed.
Disclosure of Invention
The invention provides a display driving circuit and a display device, which are used for improving the smear phenomenon during low-frequency display and improving the display quality of the display device.
In a first aspect, an embodiment of the present invention provides a display driving circuit, including: the device comprises a digital-to-analog conversion module, an output control module, an image data comparison module and a selection module;
the output control module is electrically connected with the selection module, and the selection module is also electrically connected with the image data comparison module;
the output control module comprises at least one group of control units, and the at least one group of control units comprises at least two control circuits; the image data comparison module is used for controlling the action of the selection module according to the difference degree of the image data of two adjacent frames so as to select a control circuit which is communicated with the digital-to-analog conversion module in the control unit;
when the control circuit communicated with the digital-to-analog conversion module in the control unit is different, the voltage and/or current generated by the display driving circuit and corresponding to the same gray scale output signal are different.
Optionally, the output control module includes a first group of control units, the first group of control units is a gamma voltage generation unit, the gamma voltage generation unit includes n groups of gamma circuits, the gamma circuits are control circuits of the first group of control units, and the gamma voltages corresponding to the same gray scale generated by different groups of gamma circuits are different; the selection module comprises a first selection unit, and the digital-to-analog conversion module is electrically connected with each group of gamma circuits through the first selection unit; n is more than or equal to 2;
the image data comparison module is used for controlling the action of the first selection unit according to the difference degree of the image data of two adjacent frames so as to select the gamma circuit communicated with the digital-to-analog conversion module.
Optionally, the image difference degrees of two adjacent frames include n difference ranges, where the difference degrees of the 1 st difference range and the nth difference range sequentially increase;
the gamma circuits from the 1 st group to the nth group are gradually increased corresponding to the same gray scale voltage, and the image data comparison module is used for controlling the first selection unit to act so as to control the gamma circuits from the ith group to be communicated with the digital-to-analog conversion module when the difference degree of the image data of two adjacent frames is within the ith difference range;
wherein i is more than or equal to 1 and less than or equal to n.
Optionally, the output control module includes a second group of control units, the second group of control units are current amplification units, each current amplification unit includes n groups of current amplification circuits, and the current amplification circuits are control circuits of the second group of control units, where different groups of current amplification circuits have different driving capabilities; the selection module comprises a second selection unit, and the digital-to-analog conversion module is electrically connected with the current amplification unit through the second selection unit; n is more than or equal to 2;
the image data comparison module is used for controlling the action of the second selection unit according to the difference degree of the image data of two adjacent frames so as to select the current amplification circuit communicated with the digital-to-analog conversion module.
Optionally, the image difference degrees of two adjacent frames include n difference ranges, where the difference degrees of the 1 st difference range and the nth difference range sequentially increase;
the driving capability of the 1 st group of current amplifying circuits to the nth group of current amplifying circuits is increased progressively;
the image data comparison module is used for controlling the second selection unit to act so as to control the communication between the ith group of current amplification circuits and the digital-to-analog conversion module when the difference degree of the image data in two adjacent frames is within the ith difference range;
wherein i is more than or equal to 1 and less than or equal to n.
Alternatively to this, the first and second parts may,
the first selection unit comprises first switches in one-to-one correspondence with the gamma circuits, the control ends of the first switches are electrically connected with the image data comparison module, the first ends of the first switches are electrically connected with the corresponding gamma circuits, and the second ends of the first switches are electrically connected with the digital-to-analog conversion module;
the image data comparison module is used for outputting a control signal to the control end of the first switch according to the difference degree of the image data of two adjacent frames so as to select the gamma circuit communicated with the digital-to-analog conversion module.
Optionally, the output control module includes a second group of control units, the second group of control units is a current amplification unit, the current amplification unit includes a group of current amplification circuits, the current amplification circuits are used as control circuits of the second group of control units, an input end of the current amplification circuit is electrically connected with the digital-to-analog conversion module, and an output end of the current amplification unit is electrically connected with an output end of the display driving circuit.
Alternatively to this, the first and second parts may,
the second selection unit comprises second switches in one-to-one correspondence with the current amplification circuits, the control ends of the second switches are electrically connected with the image data comparison module, the first ends of the second switches are electrically connected with the digital-to-analog conversion module, and the second ends of the second switches are electrically connected with the input ends of the corresponding current amplification circuits.
Optionally, the display driving circuit further includes a third selection unit, where the third selection unit includes third switches corresponding to the current amplification circuits one to one, a control end of each third switch is electrically connected to the image data comparison module, a first end of each third switch is electrically connected to an output end of the corresponding current amplification circuit, and a second end of each third switch is electrically connected to an output end of the display driving circuit;
the image data comparison module is also used for outputting a control signal to the control end of the third switch according to the difference degree of the image data of two adjacent frames so as to select the current amplification circuit communicated with the output end of the display driving circuit, wherein the second switch and the third switch which are connected with the same current amplification circuit are simultaneously switched on or switched off.
In a second aspect, an embodiment of the present invention further provides a display device, including the display driving circuit provided in the first aspect.
In the display driving circuit and the display device provided by this embodiment, the display driving circuit is configured to include a digital-to-analog conversion module, an output control module, an image data comparison module, and a selection module, where the output control module includes at least one group of control units, and the at least one group of control units includes at least two control circuits; the image data comparison module is used for controlling the action of the selection module according to the difference degree of the image data of two adjacent frames so as to select a control circuit which is communicated with the digital-to-analog conversion module in the control unit; when the control circuit communicated with the digital-to-analog conversion module in the control unit is different, the voltage and/or current generated by the display driving circuit and corresponding to the same gray scale output signal are different; and then when the difference degree of the image data of two adjacent frames is larger, the control circuit with larger gamma voltage corresponding to the same gray scale is selected by the control selection module to be communicated with the digital-to-analog conversion module so as to improve the charging and discharging capacity of the display driving circuit on the storage capacitor of the pixel circuit in the display device, and/or the control circuit with stronger driving capacity is selected by the control selection module to be communicated with the digital-to-analog conversion module so as to improve the charging and discharging capacity of the display driving circuit on the storage capacitor of the pixel circuit in the display device, thereby improving the smear phenomenon when the display panel displays at low frequency.
Drawings
Fig. 1 is a schematic structural diagram of a display driving circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another display driving circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of another display driving circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of another display driving circuit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of another display driving circuit according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of another display driving circuit according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a gamma circuit according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
As described in the background art, the conventional display panel has a problem that a smear phenomenon occurs when displaying a low-frequency picture, so that the picture display quality of the display panel is poor. The inventor researches and discovers that the above problems occur because the conventional display panel usually realizes low-frequency display by driving a chip to skip frames or adding a field blanking area, and the pixel circuits in the display panel are not driven in the time of skipping frames or adding the field blanking area, so that the charging and discharging time of the storage capacitor of the pixel circuits in the display panel in unit time is reduced, the storage capacitor is incompletely charged and discharged, and the data storage capacitor of the current frame has partial data information of the current frame and partial data information of the previous frame, so that the overlapping condition of the two frames of data information is caused, and the dragging phenomenon of the display panel is caused. And because of being relative to high-frequency display, the charge-discharge frequency of the storage capacitor in unit time is reduced during low-frequency display, so that human eyes can distinguish the superposition of two frames of data information easily, namely human eyes can sense the smear of a display picture, namely the smear phenomenon during low-frequency display, and particularly when the data difference of two adjacent frames is large, the smear phenomenon caused by superposition of two frames of data information is more obvious.
In view of the above problems, an embodiment of the present invention provides a display driving circuit, where fig. 1 is a schematic structural diagram of a display driving circuit provided in an embodiment of the present invention, and fig. 2 is a schematic structural diagram of another display driving circuit provided in an embodiment of the present invention, and referring to fig. 1 and fig. 2, the display driving circuit includes a digital-to-analog conversion module 110, an output module 120, an image data comparison module 130, and a selection module 140; the output module 120 is electrically connected with the selection module 140, and the selection module 140 is also electrically connected with the image data comparison module 130; the output module 120 includes at least one group of control units 121, and the at least one group of control units 121 includes at least two control circuits 1211; the image data comparison module 130 is used for controlling the action of the selection module 140 according to the difference degree of the image data of two adjacent frames so as to select the control circuit 1211 which is communicated with the digital-to-analog conversion module 110 in the control unit 121; when the control circuit 1211 in the control unit 121, which is connected to the digital-to-analog conversion module 110, is different, the voltages and/or currents generated by the display driving circuit corresponding to the same gray-scale output signal are different.
Specifically, the digital-to-analog conversion module 110 may be electrically connected to a main board of the display device including the display driving circuit of the embodiment, the main board transmits the image data of each frame to the digital-to-analog conversion module 110 in the form of a digital signal, and the digital-to-analog conversion module 110 may convert the digital signal of the image data into an analog signal.
The display driving circuit shown in fig. 1 schematically shows that the output control module 120 includes one control unit 121, and the control unit 121 includes two control circuits 1211 for example. The control unit 121 may be disposed between the output terminal of the digital-to-analog conversion module 110 and the output terminal of the display driving module (specifically, the control unit 121 may be connected to the output terminal of the digital-to-analog conversion module 110 through the selection module 140), and after the digital-to-analog conversion module 110 converts the digital signal of the image data into the analog signal, the control circuit 1211 in the control unit 121, which is connected to the digital-to-analog conversion module 110, may be selected through the selection module 140, where different control circuits 1211 may have different driving capabilities, and the driving capability may specifically be a current amplification capability. When the analog signals corresponding to the same gray scale converted by the digital-to-analog conversion module 110 are output through different control circuits 1211, the currents of the output signals are different.
The display driving circuit shown in fig. 2 schematically shows that the output control module 120 includes one control unit 121, and shows that the control unit 121 includes two control circuits 1211 as an example. The control unit 121 is configured with a control circuit 1211 that can be connected to the digital-to-analog conversion module 110 in the control unit 121 (specifically, the control unit 121 is electrically connected to the input end of the digital-to-analog conversion module 110 through the selection module 140), and can be selected by the selection module 140 through the selection module 140, where when different control units 1211 are connected to the digital-to-analog conversion module 110, the digital-to-analog conversion module 110 converts the digital signals corresponding to the image data of the same gray scale into analog signals having different voltage levels, so that the voltages corresponding to the output signals of the same gray scale output by the display driving circuit are different.
In this embodiment, the display driving circuit further includes an image data comparison module 130, the image data comparison module 30 may also be electrically connected to the motherboard, the image data comparison module 130 receives a digital signal of the image data transmitted by the motherboard, the image data comparison module 130 may store image data of a previous frame of the current frame, and the difference degree between the image data of two adjacent frames (i.e., the current frame and the previous frame) is obtained by comparing the image data of the two adjacent frames. Optionally, the difference degree may be obtained by a percentage of the number of the sub-pixels displaying the gray scale change in the display device to the total number of the sub-pixels, or may be obtained by setting the gray scale change size of the sub-pixels, which is not limited herein.
In order to improve the smear phenomenon of the display panel during low frequency display, it is necessary to improve the charging and discharging capability of the display driving circuit to the storage capacitor of the pixel circuit in the display device. The capacity of the display driver circuit to charge or discharge the storage capacitor of the pixel circuit in the display device per unit time is related to the voltage and current of the output signal of the display driver circuit (the current directly affects the driving capacity, so the capacity of the storage capacitor to charge or discharge can be understood as being related to the driving capacity of the output signal). Alternatively, for the display driving circuit shown in fig. 2, the control circuits 1211 may be gamma circuits for generating gamma voltages, and the gamma voltages corresponding to the same gray scale generated by different control circuits 1211 are different. When other structures included in the display driving circuit are the same, the greater the gamma voltage of the output signal corresponding to the same gray scale generated by the control circuit 1211 connected to the digital-to-analog conversion module 110, the stronger the charging and discharging capability of the display driving circuit to the storage capacitor, and the greater the difference between the two adjacent frames of image data, the greater the gamma voltage corresponding to the same gray scale selected by the control selection module 140, the greater the charging and discharging capability of the display driving circuit to the storage capacitor of the pixel circuit in the display device is increased by the display driving circuit 1211 connected to the digital-to-analog conversion module 110, thereby improving the smear phenomenon when the display panel displays at low frequency.
For the display driving circuit shown in fig. 1, the larger the current of the output signal corresponding to the same gray scale, the stronger the driving capability of the output signal, and the stronger the charging and discharging capability of the storage capacitor. The control circuit 1211 included in the control unit 121 may be a current amplifying circuit, wherein different control circuits (current amplifying circuits) have different driving capabilities, and when other structures included in the display driving circuit are the same, the stronger the driving capability of the control circuit 1211, the stronger the charging and discharging capabilities of the display driving circuit to the storage capacitor in the pixel circuit, and the larger the difference degree between two adjacent frames of image data, the stronger the driving capability (i.e., the larger the current amplification factor) is selected by the display driving circuit through the control selection module 140 to be communicated with the digital-to-analog conversion module 110, so as to improve the charging and discharging capabilities of the display driving circuit to the storage capacitor in the pixel circuit in the display device, and further improve the smear phenomenon when the display panel displays at a low frequency. The current amplifying circuit 1211 may be a current amplifier.
It should be noted that, fig. 1 and fig. 2 only take the case that the output control module 120 in the display driving circuit includes one set of control units 121, and each set of control units 121 includes two sets of control circuits 1211 as an example, and exemplarily, the output control module 120 may further include more sets of control units, for example, both the set of control units shown in fig. 1 and the set of control units shown in fig. 2 may be included, each set of control units may also include more control circuits, and for the case that the plurality of sets of control units are included, a part of the control units may also include only one control circuit, and this embodiment is not limited specifically herein.
In the display driving circuit provided by this embodiment, the display driving circuit is configured to include a digital-to-analog conversion module, an output control module, an image data comparison module, and a selection module, where the output control module includes at least one group of control units, and the at least one group of control units includes at least two control circuits; the image data comparison module is used for controlling the action of the selection module according to the difference degree of the image data of two adjacent frames so as to select a control circuit which is communicated with the digital-to-analog conversion module in the control unit; when the control circuit communicated with the digital-to-analog conversion module in the control unit is different, the voltage and/or current generated by the display driving circuit and corresponding to the same gray scale output signal are different; and then when the difference degree of the image data of two adjacent frames is larger, the control circuit with larger gamma voltage corresponding to the same gray scale is selected by the control selection module to be communicated with the digital-to-analog conversion module so as to improve the charging and discharging capacity of the display driving circuit on the storage capacitor of the pixel circuit in the display device, and/or the control circuit with stronger driving capacity is selected by the control selection module to be communicated with the digital-to-analog conversion module so as to improve the charging and discharging capacity of the display driving circuit on the storage capacitor of the pixel circuit in the display device, thereby improving the smear phenomenon when the display panel displays at low frequency.
On the basis of the above technical solution, optionally, the output control module includes a first group of control units, the first group of control units is the gamma voltage generation unit 122, the gamma voltage generation unit 122 includes n groups of gamma circuits 1221, the gamma circuits 1221 are control circuits of the first group of control units, where the gamma voltages corresponding to the same gray scale generated by different groups of gamma circuits 1221 are different; the selection module comprises a first selection unit 141, and the digital-to-analog conversion module 110 is electrically connected with each set of gamma circuits 1221 through the first selection unit 141; n is more than or equal to 2; the image data comparing module 130 is used for controlling the first selecting unit 141 to act according to the difference degree of the image data of two adjacent frames to select the gamma circuit 1221 communicated with the digital-to-analog converting module 110.
When the digital-to-analog conversion module 110 converts the digital signal of the image data into an analog signal, an analog voltage corresponding to the digital signal is generated according to the gamma voltage provided by the gamma voltage generation unit. For the same image data received by the digital-to-analog conversion module 110, regarding the image data corresponding to a certain sub-pixel, when the digital-to-analog conversion module 110 is connected to different gamma circuits 1221, the analog voltages converted by the digital-to-analog conversion module 110 are different in magnitude. Referring to fig. 1, for example, when the digital-to-analog conversion module 110 receives a digital signal of image data, which is transmitted by the main board, of the image data, a certain sub-pixel corresponds to a digital signal of image data of 32 gray scales, and the digital-to-analog conversion module 110 is connected to a set of gamma circuits 1221 (for example, a set 1 gamma circuit) in the gamma voltage generation unit 122, an analog voltage converted by the digital-to-analog conversion module 110 according to the digital signal of the image data and the gamma voltage provided by the set 1 gamma circuit is a first analog voltage V1; when the digital-to-analog conversion module 110 is connected to another set of gamma circuits 1221 (e.g., designated as the 2 nd set of gamma circuits) in the gamma voltage generation unit 122, the analog voltage converted by the digital-to-analog conversion module 110 according to the digital signal of the image data and the gamma voltage provided by the 2 nd set of gamma circuits is the second analog voltage V2, V1 ≠ V2. When other structures included in the display driving circuit are the same, the larger the gamma voltage of the output signal corresponding to the same gray scale generated by the gamma circuit 1221 communicated with the digital-to-analog conversion module 110 is, the stronger the charging and discharging capability of the display driving circuit to the storage capacitor is, and the larger the difference degree between two adjacent frames of image data is, the greater the gamma voltage 1221 corresponding to the same gray scale selected by the first selecting unit 141 is controlled to be communicated with the digital-to-analog conversion module 110, so as to improve the charging and discharging capability of the display driving circuit to the storage capacitor of the pixel circuit in the display device, and further improve the smear phenomenon when the display panel displays at a low frequency.
Optionally, the image difference degrees of two adjacent frames include n difference ranges, where the difference degrees of the 1 st difference range and the nth difference range sequentially increase;
wherein the 1 st to nth gamma circuits 1221 to 1221 correspond to voltage increments of the same gray scale;
the image data comparing module 130 is used for controlling the first selecting unit 141 to act to control the communication between the ith group of gamma circuits and the digital-to-analog converting module 110 when the difference degree of the image data of two adjacent frames is within the ith difference range; i is more than or equal to 1 and less than or equal to n.
Taking the case of n ═ 2 as an example, that is, the image difference degree of two adjacent frames includes 2 difference ranges, which are the 1 st difference range and the second difference range respectively, and the difference degree of the 1 st difference range to the 2 nd difference range increases progressively, for example, the difference degree included in the first difference range is 0-30%, and the difference degree included in the second difference range is 31% -100%. With reference to the display driving circuit shown in fig. 1, when n is 2, the gamma voltage generating unit includes two sets of gamma circuits 1221 (respectively referred to as the 1 st set of gamma circuits and the 2 nd set of gamma circuits), where the 1 st set of gamma circuits to the 2 nd set of gamma circuits are corresponding to voltage increments of the same gray scale, that is, for any gray scale, the gamma voltage generated by the 1 st set of gamma circuits is smaller than the gamma voltage generated by the 2 nd set of gamma circuits. When the difference degree of the image data of two adjacent frames is within the ith difference range, the image data comparing module 130 controls the first selecting unit 141 to act to control the ith group of gamma circuits to be communicated with the digital-to-analog converting module 110; for example, if the difference degree between the image data of two adjacent frames is 15%, the control unit controls the first selection module 150 to operate to control the 1 st set of gamma circuits to communicate with the digital-to-analog conversion module 110 within the 1 st difference range; if the difference degree between the image data of two adjacent frames is 50%, the first selecting unit 141 is controlled to operate to control the communication between the gamma circuit group 2 and the dac module 110 within the difference range of 2; when the difference degree of the image data of two adjacent frames is larger, the charging and discharging capacity of the display driving circuit to the storage capacitor in the pixel circuit is improved by greatly improving the gamma voltage corresponding to each gray scale, and the smear phenomenon of low-frequency display is further improved.
With reference to fig. 3, optionally, the output control module includes a second group of control units, the second group of control units is the current amplifying unit 123, the current amplifying unit 123 includes n groups of current amplifying circuits 1231, and the current amplifying circuits 1231 are used as control circuits of the second group of control units, where the different groups of current amplifying circuits have different driving capabilities; the selection module comprises a second selection unit 142, and the digital-to-analog conversion module is electrically connected with the current amplification unit 123 through the second selection unit 142; n is more than or equal to 2; the image data comparing module 130 is used for controlling the second selecting unit 142 to act according to the difference degree of the image data of two adjacent frames so as to select the current amplifying circuit communicated with the digital-to-analog converting module 110.
Specifically, the current amplifying unit 123 may amplify the current of the analog signal output by the digital-to-analog converting module 110 and transmit the amplified analog signal to the output terminal of the display driving circuit, and the analog signal converted by the digital-to-analog converting module has no driving capability, and the current of the analog signal amplified by the current amplifying module 130 has driving capability for the pixel circuit in the display device.
Optionally, the image difference degrees of two adjacent frames include n difference ranges, where the difference degrees of the 1 st difference range and the nth difference range sequentially increase; the driving capability of the 1 st to nth current amplifying circuits 1231 is increased progressively; the image data comparing module 130 is configured to control the second selecting unit 142 to operate to control the i-th group of current amplifying circuits 1231 to communicate with the digital-to-analog converting module 110 when the difference degree of the image data in two adjacent frames is within the i-th difference range; wherein i is more than or equal to 1 and less than or equal to n.
With reference to the display driving circuit shown in fig. 3, when n is 2, the current amplifying unit 123 may also include 2 sets of current amplifying circuits 1231 (respectively referred to as a 1 st set of current amplifying circuits and a 2 nd set of current amplifying circuits), wherein the driving capabilities of the 1 st set of current amplifying circuits to the 2 nd set of current amplifying circuits are increased. When the difference degree of the image data in two adjacent frames is within the ith difference range, the image data comparing module 130 controls the second selecting unit 142 to operate to control the ith group of current amplifying circuits 1231 to be communicated with the digital-to-analog converting module 110; and then when the difference degree of two adjacent frames of image data is larger, the driving capability of the current amplifying circuit 1231 is improved to increase the charging and discharging capability of the display driving circuit to the storage capacitor in the pixel circuit, so as to improve the smear phenomenon of low-frequency display.
Fig. 4 is a schematic structural diagram of another display driving circuit according to an embodiment of the present invention, and referring to fig. 4, alternatively,
the first selection unit 141 includes first switches 1411 corresponding to the gamma circuits 121 one by one, a control terminal of each first switch 1411 is electrically connected to the image data comparison module 130, a first terminal of each first switch 1411 is electrically connected to the corresponding gamma circuit 1221, and a second terminal of each first switch 1411 is electrically connected to the digital-to-analog conversion module 110;
the image data comparing module 130 is configured to output a control signal to a control terminal of the first switch 1411 according to a difference degree between the image data of two adjacent frames to select the gamma circuit 1221 connected to the digital-to-analog converting module 110.
Alternatively, the first switch 1411 may be a transistor or another switching device. In fig. 2, the first switch 1411 is exemplified to include the first transistor T1, the first switch 1411 is electrically connected to the gamma circuits 1221 in a one-to-one correspondence, the image data comparing module 130 can determine the gamma circuit 1221 connected to the digital-to-analog converting module 110 according to the difference degree between two adjacent frames of image data, and is controlled to communicate with the digital-to-analog conversion module 110 by a first switch 1411 electrically connected to the gamma circuit 1221, taking the display driving circuit shown in fig. 2 as an example, the gamma voltage generating unit 122 includes two sets of gamma circuits 1221, still referred to as the 1 st set of gamma circuits 1221 and the 2 nd set of gamma circuits 1221, when the image data comparing module 130 outputs the turn-on control signal to the control terminal of the first switch 1411 connected to the group 1 gamma circuit 1221 according to the difference degree between the image data of two adjacent frames, the first switch 1411 connected with the 1 st group gamma circuit 1221 is turned on, and the 1 st group gamma circuit 1221 is communicated with the digital-to-analog conversion module 110; the gamma circuit 1221 of the group 2 is similar and will not be described in detail. At any time, only one first switch 1411 in the first selection module 150 is turned on.
With reference to fig. 4, optionally, the output control module includes a second group of control units, the second group of control units is the current amplifying unit 123, the current amplifying unit 123 includes a group of current amplifying circuits 1231, the current amplifying circuits 1231 are used as control circuits of the second group of control units, an input end of the current amplifying circuit 1231 is electrically connected to the digital-to-analog converting module 110, and an output end of the current amplifying module 130 is electrically connected to the output end OUT1 of the display driving circuit.
Specifically, the current amplifying circuit 1231 may be configured to current-amplify the analog voltage output by the digital-to-analog conversion module 110 and output the amplified analog voltage to the output end OUT1 of the display driving circuit, where the analog voltage output by the digital-to-analog conversion module 110 is amplified by the current amplifying circuit 1231 and has a driving capability, so that a signal (data voltage signal) output by the display driving circuit may drive a pixel circuit in the display device. For the display driving circuit shown in fig. 2, the gamma voltage generating module 120 includes a plurality of gamma circuits 121, the current amplifying module 130 includes only one set of display driving circuits of the current amplifying circuit 1231, the first selecting unit 141 selects the gamma circuit 121 with the larger gamma voltage corresponding to the same gray scale to communicate with the digital-to-analog converting module 110, and the display driving circuit has the stronger capability of charging and discharging the storage capacitor of the pixel circuit in the display device. In the display device, the display driving circuit is usually a driving chip of the display device, and the current amplifying unit 123 includes only one set of current amplifying circuit 1231, so that the area of the current amplifying unit 123 occupying the driving chip can be reduced, and the driving chip can be more easily miniaturized.
Fig. 5 is a schematic structural diagram of another display driving circuit according to an embodiment of the present invention, referring to fig. 5, optionally, in another alternative embodiment of the present invention, the current amplifying unit 123 includes n sets of current amplifying circuits 131, wherein the current amplifying circuits 1231 in different sets have different driving capabilities, and the digital-to-analog conversion module 110 is electrically connected to the current amplifying circuit 123 through the second selecting unit 142;
the second selection unit 142 includes second switches 1421 corresponding to the current amplification circuits 1231 one to one, a control end of the second switch 1421 is electrically connected to the image data comparison module 130, a first end of the second switch 1421 is electrically connected to the digital-to-analog conversion module 110, and a second end of the second switch 1421 is electrically connected to an input end of the corresponding current amplification circuit 1231;
the image data comparing module 130 is configured to output a control signal to a control end of the second switch 1421 according to a difference degree between the image data of two adjacent frames, so as to select the current amplifying circuit 1231 communicated with the digital-to-analog converting module 110.
Alternatively, the second switch 1421 may be a transistor or other switching devices. In fig. 2, it is illustrated that the second switch 1421 includes the second transistor T2, the second switch 1421 is electrically connected to the current amplifying circuits 1231 in a one-to-one correspondence manner, the image data comparing module 130 can determine the current amplifying circuit 1231 connected to the digital-to-analog converting module 110 according to the difference degree of the image data of two adjacent frames, and control the connection with the digital-to-analog converting module 110 through the second switch 1421 electrically connected to the gamma circuit 121, taking the display driving circuit illustrated in fig. 2 as an example, the current amplifying circuit 123 includes two sets of current amplifying circuits 1231, still respectively referred to as the 1 st set of current amplifying circuits 1231 and the 2 nd set of current amplifying circuits 1231, when the image data comparing module 140 outputs the conducting control signal to the control terminal of the second switch 1421 connected to the 1 st set of current amplifying circuits 1231 according to the difference degree of the image data of two adjacent frames, the second switch 1421 connected to the 1 st set of current amplifying circuits 1231 is turned on, the 1 st group of current amplifying circuits 1231 are communicated with the digital-to-analog conversion module 110; the current amplifying circuit 1231 of the group 2 has the same structure, and is not described herein again. Here, only one second switch 1421 in the second selection unit 142 is turned on at any time.
Fig. 6 is a schematic structural diagram of another display driving circuit according to an embodiment of the present invention, referring to fig. 6, optionally, the current amplifying circuit 123 includes n sets of current amplifying circuits 1231, where the driving capabilities of the current amplifying circuits 1231 in different sets are different, and the digital-to-analog conversion module 110 is electrically connected to the current amplifying circuit 123 through the second selection unit 142;
the second selection unit 42 includes second switches 1421 corresponding to the gamma circuits 1221 one to one, a control terminal of the second switch 1421 is electrically connected to the image comparison module, a first terminal of the second switch 1421 is electrically connected to the digital-to-analog conversion module 110, and a second terminal of the second switch 1421 is electrically connected to an input terminal of the corresponding current amplification circuit 1231.
With continued reference to fig. 6, optionally, the gamma voltage generating unit 122 includes a set of gamma circuits 1221, and the gamma circuits 1221 are electrically connected to the digital-to-analog converting module 110.
Specifically, when the display driving circuit includes n sets of current amplifying circuits 1231, even if the gamma voltage generating unit 122 only includes one set of gamma circuits 1221, the driving capability of different sets of current amplifying circuits 1231 is different, so that when the digital-to-analog converting module 110 and the current amplifying circuits 1231 are used, for the same gray scale, the display driving circuit can output driving signals with different driving capabilities, and then the image data comparing module 130 selects different current amplifying circuits 1231 according to the difference degree of two adjacent frames of image data, for example, when the difference degree of two adjacent frames of image data is larger, the current amplifying circuit 1231 with stronger driving capability is selected to be communicated with the digital-to-analog converting module 110, so that the charging and discharging capability of the display module on the storage capacitor of the pixel circuit in the display device can be improved, and the smear phenomenon under low-frequency display can be improved.
With continued reference to fig. 5 and fig. 6, optionally, the display driving circuit further includes a third selecting unit 170, the third selecting unit 170 includes third switches 171 corresponding to the current amplifying circuits 1231 one to one, a control terminal of the third switch 171 is electrically connected to the image contrast module, a first terminal of the third switch 171 is electrically connected to an output terminal of the corresponding current amplifying circuit 1231, and a second terminal of the third switch 171 is electrically connected to an output terminal of the display driving circuit;
the image data comparing module 130 is further configured to output a control signal to the control terminal of the third switch 171 according to the difference degree between the image data of two adjacent frames to select the current amplifying circuit 131 communicated with the output terminal of the display driving circuit, wherein the second switch 1421 and the third switch 171 connected to the same current amplifying circuit 1231 are simultaneously turned on or off.
Specifically, the inventors have found that, when the display driving circuit includes a plurality of current amplifying circuits 131, even if only one input terminal of one current amplifying circuit 1231 is connected to the digital-to-analog conversion module 110, if the output terminals of the plurality of current amplifying circuits 1231 of the current amplifying unit 123 are connected to the output terminal of the display driving circuit, the display driving circuit cannot normally drive the pixel circuit in the display device. Therefore, in the present embodiment, the display driving circuit is further provided with a third selecting unit 170, the third selecting unit 170 includes a third switch 171 corresponding to the current amplifying circuit 1231 one to one, the third switch 171 is used for controlling the connection state of the corresponding current amplifying circuit 1231 and the output terminal of the display driving circuit, and the third switch 171 is controlled by the image data comparing module 130. The image data comparison module 130 determines the driving capability required to be provided by the current amplifying unit 123 according to the difference degree between the image data of two adjacent frames, and controls the second selecting unit 142 and the third selecting unit 170 according to the driving capability required to be provided by the current amplifying unit 123, specifically, the image data comparison module 130 may send a conduction control signal to a control terminal of a second switch 1421 connected to a current amplifying circuit 1231 having the closest target driving capability (the driving capability required to be provided by the current amplifying unit 130) in the second selecting unit 142, and send a conduction control signal to a control terminal of a third switch 171 connected to the current amplifying circuit 1231, so that the second switch 161 and the third switch 171 of the current amplifying circuit 1231 having the closest target driving capability are conducted, and thus only one current amplifying circuit 1231 is connected to the output terminal of the display driving circuit at the same time, and further ensure the normal driving of the pixel circuit in the display panel by the display driving circuit. Alternatively, the third switch 171 may be a transistor or other switching devices, and the third switch 171 includes a third transistor T3 as shown schematically in fig. 3 and 4.
Fig. 7 is a schematic structural diagram of a gamma circuit according to an embodiment of the invention, and referring to fig. 7, the gamma circuit includes a first reference voltage input terminal VGMP and a second reference voltage input terminal VGSP, voltages inputted from the first reference voltage input terminals VGMP of different gamma circuits are different, and/or voltages inputted from the second reference voltage input terminals VGSP of different gamma circuits are different.
Referring to fig. 5, the gamma circuit further includes a plurality of resistors R connected in series between the first reference voltage input terminal VGMP and the second reference voltage initial terminal, and a plurality of output terminals, wherein the output terminals of the gamma circuit are used for outputting gamma voltages, and the magnitude of the gamma voltage outputted from the output terminals of the gamma circuit is related to the magnitude of the first reference voltage input terminal VGMP and the second reference voltage of the second reference voltage input terminal VGSP. The voltage input by the first reference voltage input end VGMP of different gamma circuits 1 included in the gamma voltage generation unit is different in magnitude, and/or the voltage input by the second reference voltage input end VGSP of different gamma circuits is different in magnitude, so that the gamma voltages corresponding to the same gray scale and generated by different gamma circuits are different in magnitude, and further, when the different gamma circuits are communicated with the digital-to-analog conversion module, the charging and discharging capacities of the display driving circuit to the storage capacitors in the pixel circuits are different.
On the basis of the above technical solutions, n is 2; and then when guaranteeing that can improve the smear phenomenon when display panel low frequency shows, guarantee that gamma circuit number that gamma voltage produces the module and include/the current amplification circuit number that the current amplification module includes can not be too much, and then guarantee that the area of display drive circuit is less, when arranging display drive circuit in display panel's non-display area, can make the display panel frame narrower.
Fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present invention, and referring to fig. 8, a display device 10 according to an embodiment of the present invention includes the display driving circuit 100 according to any embodiment of the present invention. The display device may be a mobile phone, a computer, a television, an intelligent wearable display device, and the like, and the embodiment of the present invention is not particularly limited thereto.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A display driving circuit, comprising: the device comprises a digital-to-analog conversion module, an output control module, an image data comparison module and a selection module;
the output control module is electrically connected with the selection module, and the selection module is also electrically connected with the image data comparison module;
the output control module comprises at least one group of control units, and at least one group of control units comprises at least two control circuits; the image data comparison module is used for controlling the action of the selection module according to the difference degree of the image data of two adjacent frames so as to select a control circuit which is communicated with the digital-to-analog conversion module in the control unit;
when the control circuit communicated with the digital-to-analog conversion module in the control unit is different, the voltage and/or the current which are generated by the display driving circuit and correspond to the same gray scale output signal are different.
2. The display driving circuit according to claim 1, wherein the output control module comprises a first group of control units, the first group of control units are gamma voltage generation units, the gamma voltage generation units comprise n groups of gamma circuits, the gamma circuits are control circuits of the first group of control units, wherein the gamma voltages corresponding to the same gray scale generated by the different groups of gamma circuits are different; the selection module comprises a first selection unit, and the digital-to-analog conversion module is electrically connected with each group of gamma circuits through the first selection unit; n is more than or equal to 2;
the image data comparison module is used for controlling the action of the first selection unit according to the difference degree of the image data of two adjacent frames so as to select the gamma circuit communicated with the digital-to-analog conversion module.
3. The display driving circuit according to claim 2, wherein the image difference degree of the two adjacent frames comprises n difference ranges, wherein the difference degree increases from the 1 st difference range to the n-th difference range;
the gamma circuits from the 1 st group to the nth group are gradually increased corresponding to the same gray scale voltage, and the image data comparison module is used for controlling the first selection unit to act so as to control the gamma circuits from the ith group to be communicated with the digital-to-analog conversion module when the difference degree of the image data of the two adjacent frames is within the ith difference range;
wherein i is more than or equal to 1 and less than or equal to n.
4. The display driving circuit according to claim 1, wherein the output control module comprises a second group of control units, the second group of control units are current amplifying units, the current amplifying units comprise n groups of current amplifying circuits, the current amplifying circuits serve as control circuits of the second group of control units, wherein different groups of current amplifying circuits have different driving capabilities; the selection module comprises a second selection unit, and the digital-to-analog conversion module is electrically connected with the current amplification unit through the second selection unit; n is more than or equal to 2;
the image data comparison module is used for controlling the action of the second selection unit according to the difference degree of the image data of two adjacent frames so as to select the current amplification circuit communicated with the digital-to-analog conversion module.
5. The display driving circuit according to claim 4, wherein the image difference degree of the two adjacent frames comprises n difference ranges, wherein the difference degree increases from the 1 st difference range to the n-th difference range;
the driving capability of the 1 st group of current amplifying circuits to the nth group of current amplifying circuits is increased progressively;
the image data comparison module is used for controlling the second selection unit to act so as to control the communication between the ith group of current amplification circuits and the digital-to-analog conversion module when the difference degree of the image data in two adjacent frames is within the ith difference range;
wherein i is more than or equal to 1 and less than or equal to n.
6. The display drive circuit according to claim 2,
the first selection unit comprises first switches in one-to-one correspondence with the gamma circuits, the control ends of the first switches are electrically connected with the image data comparison module, the first ends of the first switches are electrically connected with the corresponding gamma circuits, and the second ends of the first switches are electrically connected with the digital-to-analog conversion module;
the image data comparison module is used for outputting a control signal to the control end of the first switch according to the difference degree of the image data of two adjacent frames so as to select the gamma circuit communicated with the digital-to-analog conversion module.
7. The display driving circuit according to claim 6, wherein the output control module comprises a second group of control units, the second group of control units is a current amplifying unit, the current amplifying unit comprises a group of current amplifying circuits, the current amplifying circuits are control circuits of the second group of control units, an input end of the current amplifying circuit is electrically connected to the digital-to-analog conversion module, and an output end of the current amplifying unit is electrically connected to an output end of the display driving circuit.
8. The display drive circuit according to claim 4,
the second selection unit comprises second switches in one-to-one correspondence with the current amplification circuits, the control ends of the second switches are electrically connected with the image data comparison module, the first ends of the second switches are electrically connected with the digital-to-analog conversion module, and the second ends of the second switches are electrically connected with the input ends of the corresponding current amplification circuits.
9. The display driving circuit according to claim 8, further comprising a third selection unit, wherein the third selection unit comprises a third switch in one-to-one correspondence with the current amplifying circuit, a control terminal of the third switch is electrically connected to the image data comparing module, a first terminal of the third switch is electrically connected to an output terminal of the corresponding current amplifying circuit, and a second terminal of the third switch is electrically connected to an output terminal of the display driving circuit;
the image data comparison module is further used for outputting a control signal to the control end of the third switch according to the difference degree of the image data of two adjacent frames so as to select a current amplification circuit communicated with the output end of the display driving circuit, wherein the second switch and the third switch which are connected with the same current amplification circuit are simultaneously turned on or turned off.
10. A display device comprising the display driver circuit according to any one of claims 1 to 9.
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