CN111276095B - Display driving chip, display device and driving method of display driving chip - Google Patents
Display driving chip, display device and driving method of display driving chip Download PDFInfo
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- CN111276095B CN111276095B CN202010105062.4A CN202010105062A CN111276095B CN 111276095 B CN111276095 B CN 111276095B CN 202010105062 A CN202010105062 A CN 202010105062A CN 111276095 B CN111276095 B CN 111276095B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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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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Abstract
The embodiment of the invention discloses a display driving chip, a display device and a driving method of the display driving chip. The display driving chip includes: the voltage output end is used for outputting an initialization voltage and is electrically connected with a storage capacitor of the pixel driving circuit so as to initialize the storage capacitor; the voltage control module comprises an input end and an output end, the input end of the voltage control module is used for inputting image data of a displayed picture, and the output end of the voltage control module is electrically connected with the voltage output end; and the voltage control module is used for generating corresponding initialization voltage according to the display mode of the picture and outputting the initialization voltage to the voltage output end. Compared with the prior art, the embodiment of the invention optimizes the smear phenomenon of the display device and improves the display quality of the display device.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display driving chip, a display device and a driving method of the display driving chip.
Background
With the continuous development of display technology, the application of display devices is more and more extensive, and the requirements of people on the display devices are higher and higher.
Among them, the Organic Light-Emitting Diode (OLED) display device has the advantages of high brightness, thin volume, fast response speed, easy realization of color display and large screen display, and has a wide application prospect. However, when the OLED display device slides the screen rapidly, a phenomenon of smear occurs, which affects the display quality of the display device.
Disclosure of Invention
The embodiment of the invention provides a display driving chip, a display device and a driving method of the display driving chip, which are used for optimizing the smear phenomenon of the display device and improving the display quality of the display device.
In order to achieve the technical purpose, the embodiment of the invention provides the following technical scheme:
a display driver chip comprising:
the voltage output end is used for outputting an initialization voltage and is electrically connected with a storage capacitor of the pixel driving circuit so as to initialize the storage capacitor;
the voltage control module comprises an input end and an output end, the input end of the voltage control module is used for inputting image data of a displayed picture, and the output end of the voltage control module is electrically connected with the voltage output end; and the voltage control module is used for generating corresponding initialization voltage according to the display mode of the picture and outputting the initialization voltage to the voltage output end.
According to the technical scheme, the voltage control module is arranged in the display driving chip, the initialization voltage is dynamically adjusted according to different display modes of the picture, the initialization voltage corresponding to the different display modes is generated, the storage capacitor is initialized to different voltage values in the initialization stage of the pixel driving circuit, the time for writing data signals into the storage capacitor in the different display modes is short, and therefore the data writing efficiency is improved. And because the storage capacitor is electrically connected with the grid electrode of the driving transistor, the efficiency of writing data into the driving transistor is equivalently improved, so that the performance of the pixel driving circuit is improved, the smear phenomenon of the display device is optimized, and the display quality of the display device is improved.
Further, the display mode of the picture comprises: a normal mode and a dark mode; the absolute value of the initialization voltage corresponding to the dark mode is greater than the absolute value of the initialization voltage corresponding to the normal mode. Illustratively, taking the driving transistor as a P-type transistor, when the voltage of the data signal is 7.6V, the initialization voltage is set to-3V; when the voltage of the data signal is 6.6V, the initialization voltage is set to-2.5V. Thus, the time for writing the 6.6V voltage into the storage capacitor can be shortened by setting the initialization voltage to-2.5V as compared with the initialization voltage to-3V. Therefore, the data signal is written into the storage capacitor in a short time.
Furthermore, the voltage control module is further configured to obtain an average grayscale voltage of the picture according to the grayscale voltage of each pixel of the picture; wherein the average grayscale voltage represents a display mode of the picture. For the dark mode, the whole picture is displayed as black and gray, and the gray scale corresponding to the black and gray is smaller; and for the normal mode, the whole picture is displayed with black gray and bright colors, and the gray scale corresponding to the bright colors is larger. Therefore, the smaller the average gray scale is, the darker the whole picture is, and the picture can be judged to be in a dark mode; the larger the average gray scale is, the brighter the picture is as a whole, and the picture can be judged to be in a normal mode. By the arrangement, the voltage control module can avoid misjudgment of displaying dark pictures in a normal mode and displaying bright pictures in a dark mode, and accuracy of judging the display modes of the pictures is improved. And the voltage control module can perform multi-level division according to the average gray scale voltage, perform multi-level dynamic adjustment on the initialization voltage, and further optimize the smear phenomenon of the display device.
Further, the driving transistor of the pixel driving circuit is a P-type transistor; if the average gray scale voltage is larger than the black state voltage minus a preset voltage, the display mode of the picture is a dark mode; and if the average gray scale voltage is less than or equal to the black state voltage minus the preset voltage, the display mode of the picture is a normal mode. The black state voltage is a voltage required when the light emitting device is completely black. Optionally, the preset voltage is 0.6V, the black state voltage ranges from 6.0V to 7.6V, and correspondingly, the boundary voltage ranges from 5.4V to 7.0V in the dark mode and the normal mode. By the arrangement, the dark mode and the normal mode are divided more visually and accurately, so that the smear phenomenon of the display device can be optimized.
Further, the voltage control module further comprises: the image analysis unit comprises an input end and an output end, the input end of the image analysis unit is used as the input end of the voltage control module, and the image analysis unit is used for obtaining and outputting a display mode signal of the image according to the image data of the image; the voltage generating unit comprises an input end and an output end, the input end of the voltage generating unit is electrically connected with the output end of the picture analyzing unit, and the output end of the voltage generating unit is used as the output end of the voltage control module; the voltage generating unit is used for outputting an initialization voltage corresponding to the display mode at the output end of the voltage generating unit according to the display mode signal. The picture analysis unit can obtain an average gray scale voltage of the picture according to the gray scale voltage of each pixel of the picture, and the average gray scale voltage can represent a display mode of the picture. By the arrangement, the accuracy of judging the display mode of the picture can be improved, the voltage control module can perform multi-level division according to the average gray scale voltage, multi-level dynamic adjustment is performed on the initialization voltage, and the smear phenomenon of the display device is further optimized.
Furthermore, the picture analysis unit is further configured to obtain an average gray scale voltage of the picture according to the gray scale voltage of each pixel of the picture;
the voltage generation unit includes:
the enabling control subunit comprises an input end and an output end, the input end of the enabling control subunit is electrically connected with the output end of the picture analysis unit, and the enabling control subunit is used for outputting an enabling control signal at the output end of the enabling control subunit according to the average gray scale voltage;
the voltage output subunit comprises an enable input end, a first voltage input end, a second voltage input end and an output end, wherein the enable input end is electrically connected with the output end of the enable control subunit, and the first voltage input end inputs a set voltage; the second voltage input end is electrically connected with the output end of the picture analysis unit, and the output end of the voltage output subunit is used as the output end of the voltage control module; the voltage output subunit is used for outputting the set voltage at an output end of the voltage output subunit according to an enable control signal input by the enable input end, or outputting a dynamic voltage at an output end of the voltage output subunit; and calculating the dynamic voltage according to the average gray scale voltage.
By the arrangement, the voltage generation unit can output the set voltage and the dynamic voltage.
Further, the voltage generation unit includes:
the enabling control subunit is used for outputting an enabling control signal at the output end of the enabling control subunit according to the average gray scale voltage;
the voltage calculation subunit comprises an input end and an output end, the input end of the voltage calculation subunit is electrically connected with the output end of the picture analysis unit, and the voltage calculation subunit is used for outputting dynamic voltage at the output end of the voltage calculation subunit according to the average gray scale voltage;
the voltage output subunit comprises an enable input end, a first voltage input end, a second voltage input end and an output end, wherein the enable input end is electrically connected with the output end of the enable control subunit, and the first voltage input end inputs a set voltage; the second voltage input end is electrically connected with the output end of the voltage calculating subunit, and the output end of the voltage outputting subunit is used as the output end of the voltage control module; the voltage output subunit is configured to output the setting voltage or the dynamic voltage at an output terminal thereof according to an enable signal input by the enable input terminal.
By the arrangement, the voltage generation unit can output the set voltage and the dynamic voltage.
Further, the values of the dynamic voltages include at least two, and different dynamic voltages correspond to different average grayscale voltages. By the arrangement, the value of the initialization voltage is further refined, and the smear phenomenon of the display device is further optimized.
Accordingly, the present invention also provides a display device comprising: a display panel and a display driving chip according to any of the embodiments of the present invention; the display panel includes a pixel driving circuit; the voltage output end is electrically connected with a storage capacitor of the pixel driving circuit.
Correspondingly, the invention also provides a driving method of the display driving chip, which is suitable for the display driving chip in any embodiment of the invention; the driving method of the display driving chip comprises the following steps:
inputting image data of a displayed picture to an input end of the voltage control module; the voltage control module generates corresponding initialization voltage according to the display mode of the picture;
in an initialization stage of the pixel driving circuit, the display driving chip outputs the initialization voltage to a storage capacitor of the pixel driving circuit to initialize the storage capacitor.
According to the embodiment of the invention, the voltage control module is arranged in the display driving chip, the initialization voltage is dynamically adjusted according to different display modes of the picture, the initialization voltage corresponding to the different display modes is generated, the storage capacitor is initialized to different voltage values in the initialization stage of the pixel driving circuit, the time for writing data signals into the storage capacitor in the different display modes is short, and the data writing efficiency is improved. And because the storage capacitor is electrically connected with the grid electrode of the driving transistor, the efficiency of writing data into the driving transistor is equivalently improved, so that the performance of the pixel driving circuit is improved, the smear phenomenon of the display device is optimized, and the display quality of the display device is improved.
Drawings
FIG. 1 is a circuit diagram of a conventional pixel driving circuit;
fig. 2 is a schematic circuit diagram of a display driver chip according to an embodiment of the present invention;
FIG. 3 is a circuit diagram of another display driver chip according to an embodiment of the present invention;
FIG. 4 is a circuit diagram of another display driver chip according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a voltage generating unit according to an embodiment of the present invention;
FIG. 6 is a schematic circuit diagram of another voltage generation unit according to an embodiment of the present invention;
FIG. 7 is a schematic circuit diagram of another voltage generation unit 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;
fig. 9 is a flowchart illustrating a driving method of a display driver chip 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, the conventional display device has a smear phenomenon, which affects the display quality of the display device. The inventors have studied and found that the reason for this problem is that the pixel driving circuit in the display device has a defect. The specific analysis is as follows:
taking the OLED display device as an example, the OLED display device includes a display panel, and OLED devices (i.e., pixels) arranged in an array are disposed on the display panel. The display panel is also provided with a pixel driving circuit, the pixel driving circuit corresponds to the OLED devices one by one, the pixel driving circuit drives the OLED devices to emit light, and the magnitude of the driving current output by the pixel driving circuit plays a decisive role in the light emitting brightness of the OLED devices. Therefore, the performance of the pixel driving circuit directly affects the light emitting state of the OLED device, thereby affecting the display effect of the display apparatus.
Fig. 1 is a circuit diagram of a conventional pixel driving circuit. Referring to fig. 1, the pixel driving circuit has a 7T1C structure, and includes: a first transistor M1, a second transistor M2, a third transistor M3, a fourth transistor M4, a fifth transistor M5, a sixth transistor M6, a seventh transistor M7 (driving transistor), and a storage capacitor Cst. Wherein, the gate of the first transistor M1 is electrically connected to the gate of the second transistor M2, the gate of the first transistor M1 is connected to the scan signal Sn of the pixel row in which the OLED device D is located, the first pole of the first transistor M1 is electrically connected to the first pole of the sixth transistor M6, the first pole of the first transistor M1 is electrically connected to the second pole of the seventh transistor M7, the second pole of the first transistor M1 is electrically connected to the gate of the seventh transistor M7, and the second pole of the first transistor M1 is electrically connected to the second pole of the storage capacitor Cst; a first pole of the second transistor M2 is connected to the data signal VData, a second pole of the second transistor M2 is electrically connected to a first pole of the seventh transistor M7, and a second pole of the second transistor M2 is electrically connected to a first pole of the third transistor M3; a gate of the third transistor M3 is electrically connected to a gate of the sixth transistor M6, a first pole of the third transistor M3 is electrically connected to a first pole of the seventh transistor M7, and a second pole of the third transistor M3 is electrically connected to a first pole of the storage capacitor Cst; the gate of the fourth transistor M4 is connected to the scan signal Sn-1 of the previous pixel row, the first pole of the fourth transistor M4 is electrically connected to the anode of the OLED device D, the second pole of the fourth transistor M4 is connected to the initialization voltage Vint and the second pole of the fifth transistor M5; the gate of the fifth transistor M5 is connected to the scan signal Sn-1 of the previous pixel row, the first pole of the fifth transistor M5 is electrically connected to the second pole of the storage capacitor Cst, and the second pole of the fifth transistor M5 is connected to the initialization voltage signal Vint; a gate of the sixth transistor M6 is connected to the emission signal EM, a first pole of the sixth transistor M6 is electrically connected to the second pole of the seventh transistor M7, and a second pole of the sixth transistor M6 is electrically connected to the first pole of the fourth transistor M4; the first electrode of the storage capacitor Cst is connected to the first power signal VDD, and the cathode of the OLED device D is connected to the second power signal VSS.
The initialization voltage Vint is used for initializing the storage capacitor Cst and emptying the internal pre-stored voltage thereof; the seventh transistor M7 (driving transistor) generates a corresponding driving current under the action of the data signal VData to drive the OLED light emitting device D to emit light. Due to the long charging and discharging time of the storage capacitor Cst, the image of the previous frame may affect the image of the next frame, and the display device may have a smear phenomenon. However, the capacitance value of the storage capacitor Cst is adjusted in consideration of not only the charge/discharge time but also the effect of storing the charge, and if the capacitance value of the storage capacitor is decreased, the effect of storing the charge is decreased, and if the capacitance value of the storage capacitor is increased, the charge/discharge time is increased. Therefore, the difficulty of improving the capacitance value of the storage capacitor is high, so that the difficulty of improving the smear problem is high.
In the prior art, in order to save power consumption of a display device such as a mobile phone, a normal mode and a deep color mode are built in the display device. Different from the common mode, the dark color mode mostly adopts black and gray, and the luminous brightness of the OLED device is low, so that the power consumption is saved. However, in the dark mode, the voltage of the data signal is higher, and the problem of insufficient writing is more likely to occur, so that the smear phenomenon of the display device is more obvious, and the smear phenomenon is embodied that when a user slides the screen up and down quickly, the user can see black and gray stripes, thereby affecting the display quality and the user experience of the display device.
In view of this, an embodiment of the present invention provides a display driving chip. Fig. 2 is a circuit diagram of a display driver chip according to an embodiment of the present invention. Referring to fig. 2, the display driving chip 10 includes: the voltage output end 11 is used for outputting an initialization voltage Vint, and is electrically connected with a storage capacitor of the pixel driving circuit to initialize the storage capacitor; the voltage control module 100 comprises an input end 101 and an output end 102, the input end 101 of the voltage control module 100 is used for inputting image data of a displayed picture, and the output end 102 of the voltage control module 100 is electrically connected with the voltage output end 11; the voltage control module 100 is configured to generate a corresponding initialization voltage Vint according to a display mode of a picture and output the initialization voltage Vint to the voltage output terminal 11.
Illustratively, the driving method of the display driving chip 10 includes: inputting image data of a displayed picture to an input terminal 101 of the voltage control module 100; the voltage control module 100 generates a corresponding initialization voltage Vint according to the display mode of the picture; in the initialization stage of the pixel driving circuit, the display driving chip 10 outputs an initialization voltage Vint to the storage capacitor of the pixel driving circuit to initialize the storage capacitor.
The display mode of the picture refers to an overall display state of the picture, for example, the display mode of the picture includes a normal mode and a dark mode. In the dark mode, the overall brightness is lower than that in the normal mode, and if the driving transistor is a P-type transistor, the overall voltage of the data signal in the dark mode is higher. As can be seen, for the same storage capacitor and the same initialization voltage Vint, the time for writing the data signal into the storage capacitor is different in different display modes. Illustratively, taking the driving transistor as a P-type transistor as an example, the storage capacitor is initialized to-3V, the voltages of the data signals are 7.6V and 6.6V respectively, the writing time of the data signals into the storage capacitor is different, and a longer writing time is required for 6.6V.
In the embodiment of the present invention, the voltage control module 100 is disposed in the display driving chip 10, and the initialization voltage Vint is dynamically adjusted for different display modes of the picture, so as to generate the initialization voltage Vint corresponding to the different display modes, so that the storage capacitor is initialized to different voltage values in the initialization stage of the pixel driving circuit, which is beneficial to shortening the time for writing data signals into the storage capacitor in the different display modes, thereby improving the efficiency of data writing. And because the storage capacitor is electrically connected with the grid electrode of the driving transistor, the efficiency of writing data into the driving transistor is equivalently improved, so that the performance of the pixel driving circuit is improved, the smear phenomenon of the display device is optimized, and the display quality of the display device is improved. In addition, compared with the capacitance value of the improved storage capacitor, the embodiment of the invention is easy to implement and has lower cost.
In an embodiment of the present invention, optionally, the display mode of the picture includes: a normal mode and a dark mode; the absolute value of the initialization voltage Vint corresponding to the dark mode is greater than the absolute value of the initialization voltage Vint corresponding to the normal mode. Illustratively, taking the driving transistor as a P-type transistor, when the voltage of the data signal is 7.6V, the initialization voltage Vint is set to-3V; when the voltage of the data signal is 6.6V, the initialization voltage Vint is set to-2.5V. Thus, the time for writing the 6.6V voltage into the storage capacitor can be shortened when the initialization voltage Vint is set to-2.5V as compared with the initialization voltage Vint which is set to-3V. Therefore, the data writing method and the data writing device are beneficial to shortening the time for writing the data signals into the storage capacitor.
In the above embodiments, there are various methods for determining the picture display mode by the voltage control module 100, and some of the determination methods are described below, but the present invention is not limited thereto.
In an embodiment of the present invention, optionally, the voltage control module 100 is further configured to determine a display mode of the picture according to the display mode control signal. Specifically, the voltage control module 100 is electrically connected to the main board and receives a display mode control signal sent by the main board, so as to determine whether the display mode of the picture is a normal mode or a dark mode. By the arrangement, the method for judging the display mode of the picture is simple, and more programs and calculations are not needed.
In an embodiment of the invention, optionally, the voltage control module 100 is further configured to obtain an average gray-scale voltage of the picture according to the gray-scale voltage of each pixel of the picture. Here, the average gray scale voltage may represent a display mode of a picture because: for the dark mode, the whole picture is displayed as black and gray, and the gray scale corresponding to the black and gray is smaller; and for the normal mode, the whole picture is displayed with black gray and bright colors, and the gray scale corresponding to the bright colors is larger. Therefore, the smaller the average gray scale is, the darker the whole picture is, and the picture can be judged to be in a dark mode; the larger the average gray scale is, the brighter the picture is as a whole, and the picture can be judged to be in a normal mode. With the arrangement, the voltage control module 100 can avoid misjudgment of displaying dark pictures in the normal mode and displaying bright pictures in the dark mode, and accuracy of judging the display modes of the pictures is improved. And the voltage control module 100 may perform multi-level division according to the average gray scale voltage, perform multi-level dynamic adjustment on the initialization voltage Vint, and further optimize the smear phenomenon of the display device.
In an embodiment of the present invention, optionally, the driving transistor in the pixel driving circuit is a P-type transistor, and if the average grayscale voltage is greater than the black-state voltage minus the preset voltage, the display mode of the picture is a dark mode; and if the average gray scale voltage is less than or equal to the subtraction of the black state voltage and the preset voltage, the display mode of the picture is a normal mode. The black state voltage is a voltage required when the light emitting device is completely black. Optionally, the preset voltage is 0.6V, the black state voltage ranges from 6.0V to 7.6V, and correspondingly, the boundary voltage ranges from 5.4V to 7.0V in the dark mode and the normal mode. By the arrangement, the dark mode and the normal mode are divided more visually and accurately, so that the smear phenomenon of the display device can be optimized.
It should be noted that, in the above embodiments, the case where the driving transistor of the display driving chip applied in the pixel driving circuit is a P-type transistor is exemplarily shown, and the invention is not limited thereto. In other embodiments, the display driving chip can also be applied to the case that the driving transistor in the pixel driving circuit is an N-type transistor.
With continued reference to fig. 2, based on the above embodiments, optionally, the display driver chip 10 further includes a MIPI processing module 200, a RAM300, an image function module 400, a Demura & Gamma module 500, and a data interface 600. The MIPI processing module 200 is configured to receive a MIPI signal sent by the motherboard 20, process the MIPI signal, and complete 1/3 compression, where the MIPI signal includes data information of a picture. The compressed data information is stored in the RAM 300. The image function module 400 may further process the data information, for example, the display panel is a special-shaped panel (for example, including a notch region), and after the processing of the image function module 400, the edge of the notch region is smooth, so that the optimization of the data information is realized; for another example, the Pixel arrangement mode in the display panel is Sub Pixel Rendering (SPR), and after the processing of the image function module 400, the data information can be adapted to the arrangement of the SPR; for another example, Automatic Current Limiting (ACL) may also be implemented by the image function module 400, thereby saving power consumption of the display panel. The Demura & Gamma module 500 is used for realizing Demura compensation and Gamma curve adjustment, thereby improving the display quality of the display device. The data information processed by each module is transmitted to the pixel driving circuit of the display panel 30 through the data interface 600.
In the above embodiments, there are various arrangements of the voltage control module 100, and the following description will be made of several arrangements thereof, but the invention is not limited thereto.
Fig. 3 is a circuit diagram of another display driver chip according to an embodiment of the present invention. Referring to fig. 3, in an embodiment of the present invention, optionally, the voltage control module 100 includes a picture analysis unit 110 and a voltage generation unit 120. The picture analysis unit 110 includes an input end 111 and an output end 112, the input end 111 of the picture analysis unit 110 is used as an input end of the voltage control module 100, and the picture analysis unit 110 is configured to obtain and output a display mode signal of a picture according to image data of the picture; the voltage generating unit 120 comprises an input end 121 and an output end 122, the input end 121 of the voltage generating unit 120 is electrically connected with the output end 112 of the picture analyzing unit 110, and the output end 122 of the voltage generating unit 120 serves as the output end of the voltage control module 100; the voltage generating unit 120 is configured to output an initialization voltage Vint corresponding to the display mode at an output terminal thereof according to the display mode signal.
The picture analysis unit 110 is configured to determine the display mode of the picture, and illustratively, an average gray-scale voltage Vs of the picture is obtained according to the gray-scale voltage of each pixel of the picture, where the average gray-scale voltage may represent the display mode of the picture. By the arrangement, the accuracy of judging the display mode of the picture can be improved, the voltage control module 100 can perform multi-level division according to the average gray scale voltage Vs, perform multi-level dynamic adjustment on the initialization voltage Vint, and further optimize the smear phenomenon of the display device.
Fig. 4 is a circuit diagram of another display driver chip according to an embodiment of the present invention. Referring to fig. 4, in an embodiment of the present invention, the voltage generating unit 120 optionally includes: the control subunit 1210 and the voltage output subunit 1220 are enabled. The enable control subunit 1210 includes an input 1211 and an output end 1212, the input 1211 of the enable control subunit 1210 is electrically connected to the output end 112 of the picture analysis unit 110, and the enable control subunit 1210 is configured to output an enable control signal at the output end 1212 thereof according to the average gray scale voltage Vs; the voltage output subunit 1220 includes an enable input terminal 1221, a first voltage input terminal 1222, a second voltage input terminal 1223, and an output terminal 1224, the enable input terminal 1221 is electrically connected to the output terminal 1212 of the enable control subunit 1210, and the first voltage input terminal 1222 inputs the setting voltage Vint 1; the second voltage input terminal 1223 is electrically connected to the output terminal 112 of the picture analysis unit 110, and the output terminal 1224 of the voltage output subunit 1220 is used as the output terminal of the voltage control module 100; the voltage output subunit 1220 is configured to output a set voltage at an output terminal 1224 thereof or output a dynamic voltage at an output terminal 1224 thereof according to an enable control signal input at an enable input terminal 1221. Wherein, the dynamic voltage is calculated according to the average gray scale voltage Vs. With this arrangement, the voltage generation unit 120 can output both the set voltage and the dynamic voltage.
Fig. 5 is a circuit schematic diagram of a voltage generating unit according to an embodiment of the present invention. Referring to fig. 5, in an embodiment of the present invention, the output terminal of the enable control subunit 1210 optionally includes a first output terminal 1212A and a second output terminal 1212B, and the enable input terminal of the voltage output subunit 1220 correspondingly includes a first enable input terminal 1221A and a second enable input terminal 1221B. The first output terminal 1212A of the enable control subunit 1210 outputs a first enable signal Vinten1, and the second output terminal 1212B of the enable control subunit 1210 outputs a second enable signal Vinten 2. Illustratively, when Vinten1 is equal to 1 and Vinten2 is equal to 0, the set voltage Vint1 inputted from the first voltage input terminal 1222 of the voltage output subunit 1220 is valid, and when Vint is equal to Vint1, the output terminal of the voltage output subunit 1220 outputs the set voltage Vint 1; when Vinten1 is 0 and Vinten2 is 1, the average gray scale voltage Vs input by the second voltage input terminal 1223 of the voltage output subunit 1220 is valid, and Vint is a + Vs + B, where the parameter a and the parameter B are preset constants, the voltage output subunit 1220 calculates the average gray scale voltage Vs to obtain a dynamic voltage, and outputs the dynamic voltage through the output terminal 1224.
With continued reference to fig. 5, based on the above embodiments, the voltage generating unit 120 further optionally includes a voltage stabilizing capacitor C1, which is beneficial to improve the stability of the initialization voltage Vint.
Fig. 6 is a schematic circuit diagram of another voltage generating unit according to an embodiment of the present invention. Referring to fig. 6, in an embodiment of the present invention, the voltage generating unit 120 optionally includes: the enable control subunit 1210, the voltage output subunit 1220, and the voltage calculation subunit 1230. The enable control subunit 1210 includes an input 1211, a first output terminal 1212A and a second output terminal 1212B, the input 1211 of the enable control subunit 1210 is electrically connected to the output terminal 112 of the picture analysis unit 110, and the enable control subunit 1210 is configured to output an enable control signal at the output terminal 1212 thereof according to the average gray scale voltage Vs; the voltage calculating subunit 1230 includes an input end 1231 and an output end 1232, the input end 1231 of the voltage calculating subunit 1230 is electrically connected to the output end of the picture analyzing unit 110, and the voltage calculating subunit 1230 is configured to output the dynamic voltage Vint2 at the output end 1232 thereof according to the average gray scale voltage Vs; the voltage output subunit 1220 includes a first enable input terminal 1221A, a second enable input terminal 1221B, a first voltage input terminal 1222, a second voltage input terminal 1223, and an output terminal 1224, the first enable input terminal 1221A is electrically connected to the first output terminal 1212A of the enable control subunit 1210, the second enable input terminal 1221B is electrically connected to the second output terminal 1212B of the enable control subunit 1210, and the first voltage input terminal 1222 inputs the setting voltage Vint 1; the second voltage input terminal 1223 is electrically connected to the output terminal 1232 of the voltage calculating subunit 1230, and the output terminal 1224 of the voltage outputting subunit 1220 is used as the output terminal of the voltage control module 100; the voltage output subunit 1220 is configured to output the setting voltage Vint1 or the dynamic voltage Vint2 at an output terminal 1224 thereof according to the first enable signal vintn 1 input from the first enable input terminal 1221A and the second enable signal vintn 2 input from the second enable input terminal 1221B.
Illustratively, when Vinten1 is equal to 1 and Vinten2 is equal to 0, the set voltage Vint1 inputted from the first voltage input terminal 1222 of the voltage output subunit 1220 is valid, and when Vint is equal to Vint1, the output terminal of the voltage output subunit 1220 outputs the set voltage Vint 1; when Vinten1 is equal to 0 and Vinten2 is equal to 1, the dynamic voltage Vint2 inputted from the second voltage input 1223 of the voltage output subunit 1220 is asserted, and then Vint is equal to Vint 2. By the arrangement, the voltage generation unit 120 can output the setting voltage Vint1 and the dynamic voltage Vint 2.
On the basis of the above embodiments, optionally, the values of the dynamic voltage Vint2 include at least two, and different dynamic voltages Vint2 correspond to different average gray scale voltages Vs. By the arrangement, the value of the initialization voltage Vint is further refined, and the smear phenomenon of the display device is further optimized.
In the above embodiments, the initialization voltage Vint is calculated by the formula Vint ═ a × Vs + B, where A, B is a constant. Table 1 is a table of correspondence between the initialization voltage Vint and the average gray scale voltage Vs according to an embodiment of the present invention.
TABLE 1
As can be seen from table 1, the initialization voltage Vint is set flexibly and can be set by the parameter a and the parameter B, so that the initialization voltage Vint can be adjusted more finely.
Fig. 7 is a circuit schematic diagram of another voltage generation unit according to an embodiment of the present invention. Referring to fig. 7, in an embodiment of the present invention, optionally, the display driver chip 10 further includes an image function module 200, and the picture analysis unit 110 is integrated in the image function module 200. Like the image analysis unit 110, the image function module 200 is used for processing image data, and therefore, the image analysis unit 110 is integrated with the image function module 200, which is beneficial to saving the number of signal lines for transmitting image data.
The embodiment of the invention also provides a display device, which can be a mobile phone, a computer monitor, a tablet computer, a television, a wearable device and the like. Fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present invention. Referring to fig. 8, the display device includes: a display panel 30 and a display driving chip 20 as provided in any of the embodiments of the present invention; the display panel 30 includes a pixel driving circuit 31; the voltage output terminal 11 is electrically connected to the storage capacitor of the pixel drive circuit 31. The display device includes the display driving chip 20 provided in any embodiment of the present invention, and the technical principle and the effect thereof are similar and will not be described again.
The embodiment of the invention also provides a driving method of the display driving chip, and the driving method of the display driving chip is suitable for the display driving chip provided by any embodiment of the invention. Fig. 9 is a flowchart illustrating a driving method of a display driver chip according to an embodiment of the present invention. Referring to fig. 9, the driving method of the display driving chip includes the steps of:
s110, inputting image data of a displayed picture to an input end of a voltage control module; and the voltage control module generates corresponding initialization voltage according to the display mode of the picture.
And S120, in the initialization stage of the pixel driving circuit, the display driving chip outputs an initialization voltage to the storage capacitor of the pixel driving circuit so as to initialize the storage capacitor.
According to the embodiment of the invention, the initialization voltage is dynamically adjusted according to different display modes of the picture to generate the initialization voltage corresponding to the different display modes, so that the storage capacitor is initialized to different voltage values in the initialization stage of the pixel driving circuit, the time for writing data signals into the storage capacitor in the different display modes is short, and the data writing efficiency is improved. And because the storage capacitor is electrically connected with the grid electrode of the driving transistor, the efficiency of writing data into the driving transistor is equivalently improved, so that the performance of the pixel driving circuit is improved, the smear phenomenon of the display device is optimized, and the display quality of the display device is improved. In addition, compared with the capacitance value of the improved storage capacitor, the embodiment of the invention is easy to implement and has lower cost.
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 driver chip, comprising:
the voltage output end is used for outputting an initialization voltage and is electrically connected with a storage capacitor of the pixel driving circuit so as to initialize the storage capacitor;
the voltage control module comprises an input end and an output end, the input end of the voltage control module is used for inputting image data of a displayed picture, and the output end of the voltage control module is electrically connected with the voltage output end; the voltage control module is used for generating corresponding initialization voltage according to the display mode of the picture and outputting the initialization voltage to the voltage output end; the voltage control module is further used for dynamically adjusting the initialization voltage according to different display modes of the picture, generating initialization voltages corresponding to the different display modes and outputting the initialization voltages to the voltage output end.
2. The display driver chip of claim 1, wherein the display mode of the picture comprises: a normal mode and a dark mode;
the absolute value of the initialization voltage corresponding to the dark mode is greater than the absolute value of the initialization voltage corresponding to the normal mode.
3. The display driving chip of claim 2, wherein the voltage control module is further configured to obtain an average grayscale voltage of the picture according to a grayscale voltage of each pixel of the picture; wherein the average grayscale voltage represents a display mode of the picture.
4. The display driving chip according to claim 3, wherein the driving transistor of the pixel driving circuit is a P-type transistor;
if the average gray scale voltage is larger than the black state voltage minus a preset voltage, the display mode of the picture is a dark mode;
and if the average gray scale voltage is less than or equal to the black state voltage minus the preset voltage, the display mode of the picture is a normal mode.
5. The display driver chip of claim 1, wherein the voltage control module further comprises:
the image analysis unit comprises an input end and an output end, the input end of the image analysis unit is used as the input end of the voltage control module, and the image analysis unit is used for obtaining and outputting a display mode signal of the image according to the image data of the image;
the voltage generating unit comprises an input end and an output end, the input end of the voltage generating unit is electrically connected with the output end of the picture analyzing unit, and the output end of the voltage generating unit is used as the output end of the voltage control module; the voltage generating unit is used for outputting an initialization voltage corresponding to the display mode at the output end of the voltage generating unit according to the display mode signal.
6. The display driver chip of claim 5,
the picture analysis unit is also used for obtaining the average gray scale voltage of the picture according to the gray scale voltage of each pixel of the picture;
the voltage generation unit includes:
the enabling control subunit comprises an input end and an output end, the input end of the enabling control subunit is electrically connected with the output end of the picture analysis unit, and the enabling control subunit is used for outputting an enabling control signal at the output end of the enabling control subunit according to the average gray scale voltage;
the voltage output subunit comprises an enable input end, a first voltage input end, a second voltage input end and an output end, wherein the enable input end is electrically connected with the output end of the enable control subunit, and the first voltage input end inputs a set voltage; the second voltage input end is electrically connected with the output end of the picture analysis unit, and the output end of the voltage output subunit is used as the output end of the voltage control module; the voltage output subunit is used for outputting the set voltage at an output end of the voltage output subunit according to an enable control signal input by the enable input end, or outputting a dynamic voltage at an output end of the voltage output subunit; and calculating the dynamic voltage according to the average gray scale voltage.
7. The display driving chip according to claim 5, wherein the voltage generating unit comprises:
the enabling control subunit comprises an input end and an output end, the input end of the enabling control subunit is used as the input end of the voltage generating subunit, and the enabling control subunit is used for outputting an enabling control signal at the output end of the enabling control subunit according to the average gray scale voltage;
the voltage calculation subunit comprises an input end and an output end, the input end of the voltage calculation subunit is electrically connected with the output end of the picture analysis unit, and the voltage calculation subunit is used for outputting dynamic voltage at the output end of the voltage calculation subunit according to the average gray scale voltage;
the voltage output subunit comprises an enable input end, a first voltage input end, a second voltage input end and an output end, wherein the enable input end is electrically connected with the output end of the enable control subunit, and the first voltage input end inputs a set voltage; the second voltage input end is electrically connected with the output end of the voltage calculating subunit, and the output end of the voltage outputting subunit is used as the output end of the voltage control module; the voltage output subunit is configured to output the setting voltage or the dynamic voltage at an output terminal thereof according to an enable signal input by the enable input terminal.
8. The display driver chip according to claim 6 or 7, wherein the dynamic voltages have at least two values, and different dynamic voltages correspond to different average grayscale voltages.
9. A display device, comprising: a display panel and a display driving chip according to any one of claims 1 to 8; the display panel includes a pixel driving circuit; the voltage output end is electrically connected with a storage capacitor of the pixel driving circuit.
10. The driving method of the display driving chip is characterized in that the display driving chip comprises a voltage output end and a voltage control module, wherein the voltage output end is electrically connected with a storage capacitor of a pixel driving circuit; the voltage control module comprises an input end and an output end, and the output end of the voltage control module is electrically connected with the voltage output end;
the driving method of the display driving chip comprises the following steps:
inputting image data of a displayed picture to an input end of the voltage control module; the voltage control module generates corresponding initialization voltage according to the display mode of the picture; the voltage control module is also used for dynamically adjusting the initialization voltage aiming at different display modes of the picture to generate the initialization voltage corresponding to the different display modes;
in an initialization stage of the pixel driving circuit, the display driving chip outputs the initialization voltage to a storage capacitor of the pixel driving circuit to initialize the storage capacitor.
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