CN113707081A - Display panel driver and display device - Google Patents
Display panel driver and display device Download PDFInfo
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- CN113707081A CN113707081A CN202111270309.9A CN202111270309A CN113707081A CN 113707081 A CN113707081 A CN 113707081A CN 202111270309 A CN202111270309 A CN 202111270309A CN 113707081 A CN113707081 A CN 113707081A
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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]
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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
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
Abstract
The application discloses display panel driver and display device belongs to and shows technical field. The display panel driver includes a timing controller and a plurality of first switches. Each first switch is connected between one driving wire and the power supply, and the control end of each first switch is connected with the time schedule controller. When the display panel driver works, before the scanning signals are sequentially output by the scanning lines, namely before the display panel starts to display one frame of image, the time schedule controller controls the first switches to be conducted, so that charges are input into the driving lines. Therefore, the problem that the first row of light-emitting units of the display panel is dark or bright can be solved.
Description
Technical Field
The present disclosure relates to display technologies, and particularly to a display panel driver and a display device.
Background
The display device includes a display panel driver and a display panel. The display panel driver is used for outputting a driving signal. The display panel includes a plurality of scan lines, a plurality of driving lines, and a plurality of light emitting units. The plurality of scan lines are used to output scan signals one by one. The driving lines are connected with the display panel driver to receive and output driving signals. Each of the plurality of light emitting units is connected to one of the plurality of scanning lines and one of the plurality of driving lines, and the driving lines to which the plurality of light emitting units connected to the same scanning line are connected are different. When the display panel works, if one scanning line outputs a scanning signal and one driving line outputs a driving signal, the light-emitting units connected with the scanning line and the driving line emit light.
In the related art, when any two adjacent scan lines output scan signals one by one in the process of displaying a frame of image by the display device, a line blank duration exists after the first scan line outputs the scan signal and before the second scan line outputs the scan signal. In the process of displaying two adjacent frames of images by the display device, a frame blank time length exists after the last scanning line outputs the scanning signal when the first frame of image is displayed and before the first scanning line outputs the scanning signal when the second frame of image is displayed. In the row blank period and the frame blank period, the scanning line does not output a scanning signal, and the driving line does not output a driving signal.
However, the driving lines of the display panel may have parasitic capacitance. During the line blanking period, the parasitic capacitance discharges charges to the driving lines, so that the driving lines have a certain voltage at the end of each line blanking period. And because the frame blank duration is far greater than the line blank duration, the charges in the parasitic capacitance in the frame blank duration are completely discharged, so that the driving line has no voltage when each frame blank duration is over. This causes a problem that when the display panel displays one frame of image, the actual luminance of the light emitting unit connected to the first scanning line outputting the scanning signal is different from the actual luminance of the other light emitting units under the condition that the target luminance of each light emitting unit is the same, thereby causing the light emitting units in the first row of the display panel to be darker or brighter.
Disclosure of Invention
The application provides a display panel driver and a display device, which can solve the problem that a first row of light-emitting units of a display panel is dark or bright. The technical scheme is as follows:
a display panel driver for driving a display panel, the display panel including a plurality of scanning lines, a plurality of driving lines, and a plurality of light emitting units, each of the plurality of light emitting units being connected to one of the plurality of scanning lines and one of the plurality of driving lines, the driving lines to which the plurality of light emitting units connected to the same scanning line are connected being different; the scanning lines are used for sequentially outputting scanning signals;
the display panel driver includes: a timing controller and a plurality of first switches;
a first end of each of the plurality of first switches is connected to one end of one of the plurality of driving lines, a second end of each of the plurality of first switches is connected to a power supply, and a control end of each of the plurality of first switches is connected to the timing controller; the time schedule controller is used for: before the plurality of scanning lines output scanning signals in sequence, the plurality of first switches are controlled to be conducted so as to input charges into the plurality of driving lines.
In the present application, the display panel driver includes a timing controller and a plurality of first switches. Each first switch is connected between one driving wire and the power supply, and the control end of each first switch is connected with the time schedule controller. When the display panel driver works, before the scanning signals are sequentially output by the scanning lines, namely before the display panel starts to display one frame of image, the time schedule controller controls the first switches to be conducted, so that charges are input into the driving lines. Therefore, when the first scanning line outputs the scanning signal, the driving lines are provided with certain voltages, so that the difference between the voltage of each driving line when the first scanning line outputs the scanning signal and the voltages of other scanning lines when the other scanning lines output the scanning signal can be reduced, the difference between the actual brightness of the light-emitting unit connected with the first scanning line outputting the scanning signal and the actual brightness of other light-emitting units when the same target gray-scale value is achieved, and the problem that the first row of light-emitting units of the display panel are too dark or too bright is solved.
Optionally, the display panel driver further includes the power supply, and the power supply is a voltage source.
Optionally, the number of the light emitting units is N × M, the light emitting units are arranged in N rows and M columns, the number of the scanning lines is N, the number of the driving lines and the number of the first switches are M, a p-th light emitting unit in an i-th row is connected to an i-th scanning line in the N scanning lines and a p-th driving line in the M driving lines, N and M are positive integers, i is an integer greater than or equal to 1 and less than or equal to N, and p is an integer greater than or equal to 1 and less than or equal to M.
Optionally, the display panel driver further includes: a scanning unit and N second switches;
the scanning unit is used for outputting scanning signals, the first end of every second switch in N second switches with the output of scanning unit is connected, the second end of every second switch in N second switches with the one end of a scanning line in N scanning lines is connected, so that when arbitrary one second switch in N second switches on, the scanning line output scanning signals who is connected with the second switch that switches on, the control end of every second switch in N second switches with time schedule controller connects, time schedule controller is used for controlling N second switches switch switches on in proper order, with control N scanning lines exports scanning signals in proper order.
Optionally, the timing controller is configured to:
after the display panel displays a current frame image, acquiring image data of a next frame image of the current frame image, where the image data of the current frame image includes N × M first target gray-scale values, the N × M first target gray-scale values are target gray-scale values of the N × M light-emitting units when the display panel displays the current frame image, the image data of the next frame image includes N × M second target gray-scale values, and the N × M second target gray-scale values are target gray-scale values of the N × M light-emitting units when the display panel displays the next frame image;
acquiring the conducting time of the p-th first switch in M first switches before the scanning signals are sequentially output in the plurality of scanning lines when the display panel displays the next frame of image according to the first target gray-scale value of the p-th light-emitting unit in the Nth row and the second target gray-scale value of the p-th light-emitting unit in the 1 st row;
and controlling the conduction of the pth first switch according to the conduction duration of the pth first switch before the scanning signals are sequentially output by the plurality of scanning lines when the next frame of image is displayed by the display panel.
Optionally, the timing controller stores a first corresponding relationship, where the first corresponding relationship is a corresponding relationship between a first target gray-scale value, a second target gray-scale value, and a charging duration;
the time schedule controller is used for: and acquiring corresponding charging time from a first corresponding relation according to the first target gray-scale value of the p-th light-emitting unit in the Nth row and the second target gray-scale value of the p-th light-emitting unit in the 1 st row, wherein the charging time is used as the conducting time of the p-th first switch before the scanning lines sequentially output scanning signals when the display panel displays the next frame of image.
Optionally, in the first corresponding relationship, the larger a difference obtained by subtracting the first target grayscale value from the second target grayscale value is, the longer the on-time is.
Optionally, the timing controller stores a second corresponding relationship, where the second corresponding relationship is a corresponding relationship between a second target gray-scale value and the driving duration;
the timing controller is further configured to: and after the image data of the next frame image of the current frame image is acquired, acquiring corresponding driving time length from a second corresponding relation according to a second target gray-scale value of the p-th light-emitting unit in the ith row as the conducting time length of the p-th first switch when the ith second switch in the N second switches is conducted.
Optionally, each of the plurality of first switches is a P-type MOS transistor.
In a second aspect, there is provided a display device comprising a display panel and the display panel driver according to any one of the first aspect;
the display panel includes a plurality of scan lines, a plurality of driving lines, and a plurality of light emitting units, each of the plurality of light emitting units is connected to one of the plurality of scan lines and one of the plurality of driving lines, and the driving lines connected to the plurality of light emitting units connected to the same scan line are different.
It is understood that the beneficial effects of the second aspect can be referred to the related description of the first aspect, and are not described herein again.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic circuit structure diagram of a first display device according to an embodiment of the present disclosure;
fig. 2 is a schematic circuit structure diagram of a second display device according to an embodiment of the present disclosure;
fig. 3 is a timing diagram illustrating an operation of a display device according to an embodiment of the present application;
fig. 4 is a schematic equivalent circuit diagram of a display device according to an embodiment of the present application;
fig. 5 is a schematic circuit structure diagram of a first display device according to a second embodiment of the present disclosure;
fig. 6 is a schematic circuit structure diagram of a second display device according to a second embodiment of the present application.
Wherein, the meanings represented by the reference numerals of the figures are respectively as follows:
10. a display panel;
110. scanning a line;
120. driving a wire;
130. a light emitting unit;
20. a display panel driver;
210. a first switch;
220. a time schedule controller;
230. a power source;
232. a voltage source;
240. a scanning unit;
250. a second switch;
30. a display device.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
It should be understood that reference to "a plurality" in this application means two or more. In the description of the present application, "/" means "or" unless otherwise stated, for example, a/B may mean a or B; "and/or" herein is only an association relationship describing an associated object, and means that there may be three relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, for the convenience of clearly describing the technical solutions of the present application, the terms "first", "second", and the like are used to distinguish the same items or similar items having substantially the same functions and actions. Those skilled in the art will appreciate that the terms "first," "second," etc. do not denote any order or quantity, nor do the terms "first," "second," etc. denote any order or importance.
The first embodiment is as follows:
fig. 1 is a schematic circuit diagram of a display device 30 according to an embodiment of the present disclosure. As shown in fig. 1, the display device 30 includes a display panel 10 and a display panel driver 20.
The display panel 10 includes a plurality of scan lines 110, a plurality of driving lines 120, and a plurality of light emitting units 130. The scan lines 110 and the driving lines 120 are conductive lines. Each scan line 110 is for outputting a scan signal, and each driving line 120 is for outputting a driving signal. The Light Emitting unit 130 is an electroluminescent device, for example, the Light Emitting unit 130 may be a Light-Emitting Diode (LED), an Organic Light-Emitting Diode (OLED), a micro-LED (micro LED), or the like. Each of the plurality of light emitting units 130 is connected to one of the plurality of scanning lines 110 and to one of the plurality of driving lines 120, and 130 is connected to one of the plurality of scanning lines 110. Meanwhile, the driving lines 120 to which the plurality of light emitting units 130 connected to the same scanning line 110 are connected are different. When the display device 30 is in operation, the plurality of scan lines 110 are used to sequentially output scan signals.
For example, in the embodiment shown in fig. 1, the plurality of scan lines 110 includes G1, G2, G3, and G4, and the plurality of drive lines 120 includes S1, S2, S3, and S4. Each of the light emitting units 130 is connected to one of G1, G2, G3, and G4, and to one of S1, S2, S3, and S4. As such, when G1 outputs a scan signal and S1 outputs a driving signal, the light emitting cell 130 connected to G1 and S1 emits light electrically. When G1 outputs a scan signal and S2 outputs a driving signal, the light emitting cell 130 connected to G1 and S2 emits light electrically.
The display panel driver 20 includes a timing controller 220 and a plurality of first switches 210. Each first switch 210 is a three terminal device. That is, each of the first switches 210 has a first terminal, a second terminal, and a control terminal. For any first switch 210, the control terminal of the first switch 210 is used to control the on and off between the first terminal and the second terminal of the first switch. A first terminal of each of the first switches 210 is connected to one terminal of one of the driving lines 120, respectively. A second terminal of each first switch 210 is connected to a power supply 230. The control terminal of each first switch 210 is connected to the timing controller 220, so that the timing controller 220 can control on and off of each first switch 210, i.e., control on and off between the first terminal and the second terminal of each first switch 210.
For example, in the embodiment shown in fig. 1, the plurality of first switches 210 includes K1, K2, K3, and K4. A first end of K1 is connected to the lower end of S1 in the paper surface direction; a first end of K2 is connected to the lower end of S2 in the paper surface direction; a first end of K3 is connected to the lower end of S3 in the paper surface direction; the first end of K4 is connected to the lower end of S4 in the paper surface direction. In other embodiments, the first ends of K1, K2, K3 and K4 may also be connected to the upper ends of S1, S2, S3 and S4 in the paper direction, respectively, and will not be described in detail. Second terminals of K1, K2, K3 and K4 are all connected to the power supply 230, and on and off of K1, K2, K3 and K4 are all controlled by the timing controller 220. When the timing controller 220 controls the switch K1 to be turned on, S1 outputs a driving signal; when the timing controller 220 controls the switch K3 to be turned on, S3 outputs a driving signal. In some embodiments, as shown in fig. 2, the first switch 210 may be a MOS (metal-oxide-semiconductor) field effect transistor. For example, each first switch 210 of the plurality of first switches 210 is a P-type MOS transistor. Thus, when the timing controller 220 outputs a low level signal to the gate of one of the first switches 210, the first switch 210 is turned on. In other embodiments, not shown, the first switch 210 may also be a triac or other three-terminal switching device.
When any one of the scan lines 110 outputs a scan signal and the timing controller 220 controls any one of the first switches 210 to be turned on, the light emitting unit 130 connected to the scan line 110 outputting the scan signal and connected to the driving line 120 connected to the turned-on first switch 210 emits light. For example, in the embodiment shown in fig. 1, when G2 outputs a scan signal and K2 is turned on, the light emitting cells 130 connected to G2 and S2 emit light. When the scan signal is outputted from G3 and K4 is turned on, the light emitting cell 130 connected to G3 and S4 emits light. Fig. 3 is a timing diagram of an operation of the display device 30 according to the first embodiment of the present disclosure, and fig. 4 is a schematic diagram of an equivalent circuit of the display device 30 according to the first embodiment of the present disclosure. The parasitic capacitance of each driver line 120 is identified in fig. 4, where C1 is the parasitic capacitance of S1, C2 is the parasitic capacitance of S2, C3 is the parasitic capacitance of S3, and C4 is the parasitic capacitance of S4. The operation of the display device 30 will be described with reference to fig. 1, 3 and 4:
when the display device 30 is in operation, the plurality of scan lines 110 are used to sequentially output scan signals. Each of the plurality of driving lines 120 is used to output a driving signal when any one of the scan lines 110 outputs a scan signal. The timing controller 220 may be configured to: before the plurality of scan lines 110 sequentially output the scan signals, the plurality of first switches 210 are controlled to be turned on to input charges into the plurality of driving lines 120. In the embodiment shown in fig. 3, the high levels of G1, G2, G3, and G4 indicate that G1, G2, G3, and G4 output scan signals. The low levels of S1, S2, S3, and S4 indicate that S1, S2, S3, and S4 output drive signals. That is to say:
in a period t0, i.e., before G1, G2, G3 and G4 sequentially output scan signals, K1, K2, K3 and K4 are turned on, and S1, S2, S3 and S4 output drive signals. In this process, since G1, G2, G3, and G4 do not output the scan signal, each of the light emitting cells 130 does not emit light, and thus the power supply 230 inputs charges into S1, S2, S3, and S4. During the t1 period, G1 outputs a scan signal. During this period, if the driving signal is output at S1, the light emitting unit 130 connected to G1 and S1 emits light. The parasitic capacitance C1 of S1 is also charged with electric charges while the light emitting cell 130 connected to G1 and S1 emits light. Likewise, if the S2 outputs the driving signal during the t1 period, the light emitting unit 130 connected to G1 and S2 emits light. While the light emitting cells 130 connected to G1 and S2 emit light, the parasitic capacitance C2 of S2 also charges the charge … … in the t2 period, and no scan signal is output from G1, G2, G3, and G4, that is, the t2 period is a line blank period in which no light emitting cell 130 emits light. During this period, the parasitic capacitance C1 of S1 discharges the charge to S1. The parasitic capacitance C2 of S2 discharges the charge … … to S2, and G2 outputs a scan signal during a t3 period. In the embodiment shown in fig. 3, the t3 period includes a t31 period and a t32 period. During the t31 period, the S2 outputs the driving signal, that is, during the t31 period, the light emitting cell 130 connected to the G2 and the S2 emits light, and the parasitic capacitance C2 of the S2 charges. During the t32 period, the S1 and S3 output driving signals, that is, during the t32 period, the light emitting cells 130 connected to G2 and S1 emit light, and the light emitting cells 130 connected to G2 and S3 emit light. Meanwhile, in the period t32, the parasitic capacitor C1 of S1 charges the charge, and the parasitic capacitor C3 of S3 charges the charge. During the entire t3 period, the S4 continuously outputs the driving signal, that is, during the t3 period, the light emitting unit 130 connected to the G2 and the S4 emits light, and the parasitic capacitance C4 of the S4 charges an electric charge. In the t4 period, none of G1, G2, G3, and G4 outputs a scan signal, that is, the t4 period is a row blanking period in which no light emitting unit 130 emits light. During this period, the parasitic capacitance C1 of S1 discharges the charge to S1. The parasitic capacitance C2 of S2 releases the charge … … to S2 for subsequent t5, t6, and t7 periods no longer described in detail. When the period from t1 to t7 is completed, the display panel 10 in the display device 30 shown in fig. 1 displays one frame of image.
In the embodiment of the present application, the display panel driver 20 includes a timing controller 220 and a plurality of first switches 210. Each of the first switches 210 is connected between one of the driving lines 120 and the power supply 230, and a control terminal of each of the first switches 210 is connected to the timing controller 220. In the operation of the display panel driver 20, before the scan lines 110 sequentially output the scan signals, i.e., before the display panel 10 starts displaying one frame of image, the timing controller 220 controls the first switches 210 to be turned on, so as to input charges into the driving lines 120. When the plurality of scan lines 110 sequentially output the scan signals, the parasitic capacitance of each driving line 120 inputs charges into the driving line during each line blanking time. Thus, when the first scan line 110 outputs the scan signal, the driving lines 120 have a certain voltage, so that the difference between the voltage of each driving line 120 when the first scan line 110 outputs the scan signal and the voltage of the other scan lines 110 outputting the scan signal can be reduced, and further the difference between the actual brightness of the light emitting unit 130 connected to the first scan line 110 outputting the scan signal and the actual brightness of the other light emitting units 130 at the same target gray scale value can be reduced, thereby improving the problem that the first row of light emitting units 130 of the display panel 10 is too dark or too bright.
It is to be understood that, in the above-mentioned embodiment, the connection manner of each first switch 210 and the operation process of the display panel driver 20 are described by introducing the power supply 230 for facilitating understanding, however, this does not represent that the display panel driver 20 provided in the embodiment of the present application includes the power supply 230. In other words, the power supply 230 is present as an environmental element in the present embodiment. The display panel driver 20 provided in the embodiment of the present application may include the power supply 230, or may not include the power supply 230. In some embodiments, the power supply 230 may be a port for outputting a voltage.
Example two:
fig. 5 is a schematic circuit diagram of a display device 30 according to a second embodiment of the present application. As shown in fig. 5, in some embodiments, the display panel driver 20 may further include a power supply 230, where the power supply 230 may be a voltage supply 232, and the voltage supply 232 is used for outputting a constant voltage. In the embodiment shown in fig. 5, the first switch 210 is a mosfet.
In some embodiments, the number of the light emitting units 130 is N × M, and the light emitting units 130 are arranged in N rows and M columns. The number of the plurality of scan lines 110 is N. The number of the plurality of driving lines 120 and the plurality of first switches 210 is M. The p-th light emitting unit 130 in the i-th row is connected to the i-th scan line 110 of the N scan lines 110 and the p-th driving line 120 of the M driving lines 120. N and M are both positive integers. i is an integer greater than or equal to 1 and less than or equal to N, and p is an integer greater than or equal to 1 and less than or equal to M. For example, in the embodiment shown in FIG. 5, both N and M are 4. The 4 scan lines 110 include G1, G2, G3, and G4, the 4 drive lines 120 include S1, S2, S3, and S4, and the 4 first switches 210 include K1, K2, K3, and K4. All the light emitting cells 130 positioned in the 1 st row are connected to G1, all the light emitting cells 130 positioned in the 2 nd row are connected to G2, all the light emitting cells 130 positioned in the 3 rd row are connected to G3, and all the light emitting cells 130 positioned in the 4 th row are connected to G4. All the light emitting cells 130 positioned at the 1 st column are connected to S1, all the light emitting cells 130 positioned at the 2 nd column are connected to S2, all the light emitting cells 130 positioned at the 3 rd column are connected to S3, and all the light emitting cells 130 positioned at the 4 th column are connected to S4.
Further, the display panel driver 20 may further include: a scan unit 240 and N second switches 250. The scan unit 240 is used for outputting a scan signal. Each second switch 250 is a three terminal device. That is, each of the second switches 250 has a first terminal, a second terminal, and a control terminal. For any one of the second switches 250, the control terminal of the second switch 250 is used for controlling the on and off between the first terminal and the second terminal thereof. A first terminal of each second switch 250 is connected to an output terminal of the scan unit 240. A second terminal of each of the second switches 250 is connected to one terminal of one of the scan lines 110, respectively. The control terminal of each second switch 250 is connected to the timing controller 220 (connection relation is not shown in the figure), so that the timing controller 220 can control on and off of each second switch 250, i.e. control on and off between the first terminal and the second terminal of each second switch 250. When one second switch 250 is turned on, the scan line 110 connected to the turned-on second switch 250 outputs a scan signal.
For example, in the embodiment shown in fig. 6, the plurality of second switches 250 includes K11, K12, K13, and K14. The second end of K11 is connected with the left end of G1 along the paper surface; the second end of K12 is connected with the left end of G2 along the paper surface; the second end of K13 is connected with the left end of G3 along the paper surface; the second end of K14 is connected to the left end of G4 in the direction of the page. In other embodiments, the second ends of K11, K12, K13, and K14 may also be connected to the right ends of G1, G2, G3, and G4 in the paper direction, respectively, and will not be described in detail. First terminals of K11, K12, K13 and K14 are all connected to the output terminal of the scan cell 240, and turn-on and turn-off of K11, K12, K13 and K14 are all controlled by the timing controller 220. When the timing controller 220 controls the switch K11 to be turned on, G1 outputs a scan signal; when the timing controller 220 controls the switch K12 to be turned on, G2 outputs a scan signal. In some embodiments, the second switch 250 may be a MOS field effect transistor. In other embodiments, the second switch 250 may also be a triac or other three-terminal switching device.
In order to sequentially output the scan signals from the plurality of scan lines 110 when the display device 30 is in operation, the timing controller 220 is configured to perform the following steps S210 to S230:
s210, in the first time period, controlling the ith second switch 250 of the N second switches 250 to be turned on.
And S220, controlling the ith second switch 250 to be switched off in the second time period.
And S230, controlling the (i + 1) th second switch 250 in the N second switches 250 to be conducted in a third time period.
The first time length, the second time length and the third time length are three time periods which are adjacent in sequence and are not overlapped with each other. Each second switch 250 is in an off state when it does not receive a control signal. Taking i equal to 1 as an example, namely: in the first time period, the 1 st second switch 250 (i.e., K11) is controlled to be turned on, so that the G1 outputs a scan signal; in the second time length, controlling the 1 st second switch 250 (namely, K11) to be turned off, so that none of G1, G2, G3 and G4 outputs a scan signal; in the third time period, the 2 nd second switch 250 (i.e., K12) is controlled to be turned on, so that the G2 outputs the scan signal. Thus, the sequential output of the scanning signals of G1 and G2 can be realized. In this process, the first time period may be the period t1 in the embodiment shown in fig. 3, the second time period may be the period t2 in the embodiment shown in fig. 3, and the third time period may be the period t3 in the embodiment shown in fig. 3.
Taking i equal to 2 as an example, namely: in the first time period, the 2 nd second switch 250 (i.e. K12) is controlled to be turned on, so that the G2 outputs a scan signal; in the second time length, controlling the 2 nd second switch 250 (namely, K12) to be turned off, so that none of G1, G2, G3 and G4 outputs a scan signal; in the third time period, the 3 rd second switch 250 (i.e., K13) is controlled to be turned on, so that the G3 outputs the scan signal. Thus, the sequential output of the scanning signals of G2 and G3 can be realized. In this process, the first time period may be the time period t3 in the embodiment shown in fig. 3, the second time period may be the time period t4 in the embodiment shown in fig. 3, and the third time period may be the time period t5 in the embodiment shown in fig. 3.
When i traverses from 1 to N-1, i takes values of 1, 2, and 3 … … N-1 in sequence, N scan lines 110 can output scan signals in sequence.
In some embodiments, the timing controller 220 controls the plurality of first switches 210 to be turned on to input charges into the plurality of driving lines 120 before performing "sequentially outputting the scan signals to the plurality of scan lines 110", specifically, performs the following steps S110 to S130. That is, the following steps S110 to S130 precede the steps S210 to S230.
S110, after the display panel 10 displays the current frame image, acquiring image data of a next frame image of the current frame image, where the image data of the current frame image includes N × M first target gray-scale values, the N × M first target gray-scale values are target gray-scale values of N × M light-emitting units 130 when the display panel 10 displays the current frame image, the image data of the next frame image includes N × M second target gray-scale values, and the N × M second target gray-scale values are target gray-scale values of N × M light-emitting units 130 when the display panel 10 displays the next frame image.
When the display device 30 operates, the display panel 10 achieves a dynamic display effect by continuously displaying a plurality of frames of images. For example, the display panel 10 may display 120 frames of images or 90 frames of images within one second. Generally, there is a frame blank time duration between the display of each two adjacent frame images. The display panel 10 does not display an image for the frame blank period. Steps S110 to S130 are applied to the display panel 10 after displaying one frame image and within the frame blank period before starting displaying the next frame image. For convenience of description, an image of one frame that has been displayed is referred to as a current frame image, and an image adjacent to the current frame image and not displayed is referred to as a next frame image of the current frame image.
When the display apparatus 30 is applied to a Personal Computer (PC) or a notebook computer, image data of each frame image (including a current frame image and a next frame image of the current frame image) may be transmitted from a main board or a video card of the PC or the notebook computer. When the display device 30 is applied to a mobile terminal such as a mobile phone or a tablet computer, the image data of each frame of image may be sent by a Central Processing Unit (CPU) of the mobile phone or the tablet computer. The image data of each image in each frame image includes a plurality of target gray-scale values. In general, the number of target gray-scale values in the image data of each frame image may be equal to the number of light emitting units 130 in the display panel 10. The plurality of target gray-scale values are target gray-scale values of the plurality of light emitting units 130. For example, for the embodiment shown in fig. 6, the display panel 10 includes 16 light emitting units 130. The image data of each frame of image may also include 16 target gray-scale values, each corresponding to one light-emitting unit 130, so that the image is displayed on the display panel 10 after the display panel driver 20 drives the 16 light-emitting units 130 of the display panel 10 to emit light.
In the embodiment of the present application, the image data of each frame image includes N × M target gray-scale values. For convenience of description, a target gray-scale value in image data of a current frame image is referred to as a first target gray-scale value, and a target gray-scale value in image data of a next frame image of the current frame image is referred to as a second target gray-scale value. That is, the image data of the current frame image includes N × M first target gray-scale values, which are target gray-scale values of the N × M light-emitting units 130 when the display panel 10 displays the current frame image. The image data of the next frame image includes N × M second target gray-scale values, which are target gray-scale values of the N × M light-emitting units 130 when the display panel 10 displays the next frame image.
S120, acquiring a turn-on duration of a p-th first switch 210 of the M first switches 210 before the scanning signal is sequentially output in the plurality of scanning lines 110 when the display panel 10 displays a next frame image according to the first target gray-scale value of the p-th light-emitting unit 130 of the nth row and the second target gray-scale value of the p-th light-emitting unit 130 of the 1 st row.
S130, controlling the p-th first switch 210 to be turned on according to the turn-on duration of the p-th first switch 210 before the scanning lines 110 sequentially output the scanning signal when the display panel 10 displays the next frame of image.
Taking p equal to 1 as an example, in the embodiment shown in fig. 6, after the image data of the current frame image and the image data of the next frame image are acquired, the on-time period of K1 before the scanning signal is output by G1 when the next frame image is displayed on the display panel 10 may be acquired according to the first target gray-scale value of the 1 st light-emitting unit 130 corresponding to the last row in the image data of the current frame image and the second target gray-scale value of the 1 st light-emitting unit 130 corresponding to the first row in the image data of the next frame image. Before G1 outputs the scan signal again, K1 is controlled to be turned on according to the acquired on-time length of K1. In this way, the charge is input into S1 before the next frame image is displayed.
Likewise, when p is equal to 2, after the image data of the current frame image and the image data of the next frame image are acquired, the turn-on duration of K2 before the scan signal is output by G1 when the next frame image is displayed by the display panel 10 may be acquired based on the first target gray-scale value of the 2 nd light-emitting cell 130 corresponding to the last row in the image data of the current frame image and the second target gray-scale value of the 2 nd light-emitting cell 130 corresponding to the first row in the image data of the next frame image. Before G1 outputs the scan signal again, K2 is controlled to be turned on according to the acquired on-time length of K2. In this way, the charge is input into S2 before the next frame image is displayed.
When p traverses 1 to M, the on-time of each first switch 210 before the scanning lines 110 sequentially output the scanning signals when the display panel 10 displays the next frame of image can be obtained. Before displaying the next frame of image, each first switch 210 is turned on according to the obtained turn-on of each first switch 210, so that the charge can be input into each driving line 120. In this embodiment, the on-time of the p-th first switch 210 is obtained according to the first target gray-scale value of the p-th light-emitting unit 130 in the nth row and the second target gray-scale value of the p-th light-emitting unit 130 in the 1 st row, and the first target gray-scale value of the p-th light-emitting unit 130 in the nth row, the second target gray-scale value of the p-th light-emitting unit 130 in the 1 st row and the on-time of the p-th first switch 210 may be set according to an actual situation, so that the luminance difference between the actual luminance of the light-emitting unit 130 connected to the first scanning line 110 outputting the scanning signal and the actual luminance of the other light-emitting units 130 may be more accurately reduced, and the problem that the light-emitting unit 130 in the first row of the display panel 10 is slightly dark or slightly bright is solved.
Example three:
in some embodiments, a first corresponding relationship is stored in the timing controller 220, and the first corresponding relationship is a corresponding relationship between a first target gray-scale value, a second target gray-scale value and a charging time period. For example, the first correspondence may be as in table 1 below:
TABLE 1
Wherein, a represents a first target gray-scale value, i.e. a first target gray-scale value of the p-th light-emitting unit 130 corresponding to the nth row in the image data of the current frame image; c denotes a second target gray-scale value, i.e., a first target gray-scale value of the p-th light emitting unit 130 corresponding to the 1 st row in the image data of the next frame image; b is a charging duration, i.e. a turn-on duration of the pth first switch 210 before the scan lines 110 sequentially output the scan signals when the display panel 10 displays the next frame of image.
Still taking the embodiment shown in fig. 6 as an example, i.e. the display panel 10 includes four scan lines 110G 1, G2, G3 and G4, and four drive lines 120S 1, S2, S3 and S4, as can be seen from table 1: if the first target gray-scale value of the light emitting cells 130 connected to G4 and S1 in the current frame image is G000 and the second target gray-scale value of the light emitting cells 130 connected to G4 and S1 in the next frame image is G254, the corresponding charging time period is t 254000. That is, before G1 outputs the scan signal, the timing controller 220 controls the time period for which K1 connected to S1 is turned on for t 254000. If the first target gray-scale value of the light emitting cells 130 connected to G4 and S1 in the current frame image is G255 and the second target gray-scale value of the light emitting cells 130 connected to G4 and S1 in the next frame image is G253, the corresponding charging period is t 253255. That is, before G1 outputs the scan signal, the timing controller 220 controls the time period for which K1 connected to S1 is turned on t 253255.
Generally, in the above correspondence relationship, the larger the difference obtained by subtracting the first target gray scale value from the second target gray scale value is, the longer the on-time period is.
Example four:
in the embodiment of the present application, when the display device 30 displays an image, the current in each light emitting unit 130 is equal and constant. In this case, the display panel driver 20 controls the on time of each light emitting unit 130 when the scan line 110 outputs the scan signal by controlling the on time of the first switch 210 connected to each light emitting unit 130, so as to control the brightness of each light emitting unit 130 when displaying one frame of image.
Taking the example that the display panel 10 needs to display the next frame image of the current frame image, and the image data of the next frame image includes N × M second target gray scale values, in some embodiments, a second corresponding relationship is stored in the timing controller 220, and the second corresponding relationship is a corresponding relationship between the second target gray scale value and the driving duration. For example, the second correspondence relationship may be as shown in table 2 below:
TABLE 2
As can be seen from table 2, when the second target gray scale value of the light emitting cells 130 connected to G1 and S1 is G000, the driving time period corresponding to the light emitting cells 130 connected to G1 and S1 is t 001. That is, when G1 outputs the scan signal, the timing controller 220 controls a time period during which the first switch 210 connected to S1 is turned on t 001. When the second target gray scale value of the light emitting unit 130 connected to G1 and S1 is G011, the driving time period corresponding to the light emitting unit 130 connected to G1 and S1 is t 012. That is, when G1 outputs the scan signal, the timing controller 220 controls a duration for which the first switch 210 connected to S1 is turned on t 012. In the process of displaying the next frame image of the current frame image, when any one of the scan lines 110 outputs the scan signal, the timing controller 220 controls the on-time of the second switch 250 connected to each of the light emitting units 130 according to the second target gray-scale value of each of the light emitting units 130 connected to the scan line 110 and the second corresponding relationship, so that the display panel 10 can display the next frame image of the current frame image.
In other embodiments, since the amount of charge remaining in the p-th driving line 120 is related to the second target gray-scale value of the p-th light emitting unit 130 in the i-1 th row when the p-th light emitting unit 130 in the i-th row emits light, the timing controller 220 may also obtain the corresponding driving time period as the first on-time period of the p-th first switch 210 according to the following third corresponding relationship. The third correspondence may be as shown in table 3 below:
TABLE 3
Where a denotes a second target gray-scale value of the p-th light emitting cell 130 of the i-1 th row, C denotes a second target gray-scale value of the p-th light emitting cell 130 of the i-th row, and B denotes a driving time period. The third correspondence relationship may be prestored in the timing controller 220.
The third corresponding relationship is suitable for obtaining the driving time of the light emitting units 130 in the 2 nd to nth rows in the display panel 10. For the light emitting units 130 in the row 1, the driving duration can still be obtained by using the second corresponding relationship, that is, the driving duration of the light emitting unit 130 is obtained according to the second target gray-scale value of each light emitting unit 130 in the row 1, and the obtained driving duration is used as the conducting duration of each first switch 210 when the scanning signal is output by the 1 st scanning line 110.
As can be seen from table 3, when the second target gray scale value of the light emitting cell 130 connected to G1 and S1 is G255 and the second target gray scale value of the light emitting cell 130 connected to G2 and S1 is G001, the corresponding driving time period is t 001255. That is, when G2 outputs the scan signal, the timing controller 220 controls a time period during which the first switch 210 connected to S1 is turned on t 001255. When the second target gray scale value of the light emitting cell 130 connected to G1 and S1 is G002 and the second target gray scale value of the light emitting cell 130 connected to G2 and S1 is G254, the corresponding driving time period is t 254002. That is, when G2 outputs the scan signal, the timing controller 220 controls a time period during which the first switch 210 connected to S1 is turned on t 254002.
In the embodiment of the present application, the display panel driver 20 includes a timing controller 220 and a plurality of first switches 210. Each of the first switches 210 is connected between one of the driving lines 120 and the power supply 230, and a control terminal of each of the first switches 210 is connected to the timing controller 220. In the operation of the display panel driver 20, before the scan lines 110 sequentially output the scan signals, i.e., before the display panel 10 starts displaying one frame of image, the timing controller 220 controls the first switches 210 to be turned on, so as to input charges into the driving lines 120. Thus, when the first scan line 110 outputs the scan signal, the driving lines 120 have a certain voltage, so that the difference between the voltage of each driving line 120 when the first scan line 110 outputs the scan signal and the voltage of the other scan lines 110 outputting the scan signal can be reduced, and further the difference between the actual brightness of the light emitting unit 130 connected to the first scan line 110 outputting the scan signal and the actual brightness of the other light emitting units 130 at the same target gray scale value can be reduced, thereby improving the problem that the first row of light emitting units 130 of the display panel 10 is too dark or too bright.
The timing controller 220 may store therein a first correspondence relationship between a first target gray-scale value, a second target gray-scale value, and a charging period. In this way, in the first corresponding relationship, the timing controller 220 may obtain the on-time of the p-th first switch 210 before displaying the next frame image according to the first target gray-scale value of the p-th light emitting unit 130 in the nth row in the image data of the current frame image and the second target gray-scale value of the p-th light emitting unit 130 in the 1 st row in the image data of the next frame image. In this way, the luminance difference between the actual luminance of the light emitting unit 130 connected to the first scanning line 110 outputting the scanning signal and the actual luminance of the other light emitting units 130 can be more accurately reduced, and the problem that the light emitting unit 130 in the first row of the display panel 10 is darker or brighter can be solved.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A display panel driver for driving a display panel, the display panel including a plurality of scanning lines, a plurality of driving lines, and a plurality of light emitting units, each of the plurality of light emitting units being connected to one of the plurality of scanning lines and one of the plurality of driving lines, the driving lines to which the plurality of light emitting units connected to the same scanning line are connected being different; the scanning lines are used for sequentially outputting scanning signals;
wherein the display panel driver includes: a timing controller and a plurality of first switches;
a first end of each of the plurality of first switches is connected to one end of one of the plurality of driving lines, a second end of each of the plurality of first switches is connected to a power supply, and a control end of each of the plurality of first switches is connected to the timing controller; the time schedule controller is used for: before the plurality of scanning lines output scanning signals in sequence, the plurality of first switches are controlled to be conducted so as to input charges into the plurality of driving lines.
2. The display panel driver of claim 1, wherein the display panel driver further comprises the power supply, the power supply being a voltage supply.
3. The display panel driver of claim 1, wherein the plurality of light emitting units are N × M in number and are arranged in N rows and M columns, the plurality of scanning lines are N in number, the plurality of driving lines and the plurality of first switches are M in number, a p-th light emitting unit located in an i-th row is connected to an i-th scanning line of the N scanning lines and a p-th driving line of the M driving lines, N and M are positive integers, i is an integer greater than or equal to 1 and less than or equal to N, and p is an integer greater than or equal to 1 and less than or equal to M.
4. The display panel driver of claim 3, wherein the display panel driver further comprises: a scanning unit and N second switches;
the scanning unit is used for outputting scanning signals, the first end of every second switch in N second switches with the output of scanning unit is connected, the second end of every second switch in N second switches with the one end of a scanning line in N scanning lines is connected, so that when arbitrary one second switch in N second switches on, the scanning line output scanning signals who is connected with the second switch that switches on, the control end of every second switch in N second switches with time schedule controller connects, time schedule controller is used for controlling N second switches switch switches on in proper order, with control N scanning lines exports scanning signals in proper order.
5. The display panel driver of claim 3, wherein the timing controller is to:
after the display panel displays a current frame image, acquiring image data of a next frame image of the current frame image, where the image data of the current frame image includes N × M first target gray-scale values, the N × M first target gray-scale values are target gray-scale values of the N × M light-emitting units when the display panel displays the current frame image, the image data of the next frame image includes N × M second target gray-scale values, and the N × M second target gray-scale values are target gray-scale values of the N × M light-emitting units when the display panel displays the next frame image;
acquiring the conducting time of the p-th first switch in M first switches before the scanning signals are sequentially output in the plurality of scanning lines when the display panel displays the next frame of image according to the first target gray-scale value of the p-th light-emitting unit in the Nth row and the second target gray-scale value of the p-th light-emitting unit in the 1 st row;
and controlling the conduction of the pth first switch according to the conduction duration of the pth first switch before the scanning signals are sequentially output by the plurality of scanning lines when the next frame of image is displayed by the display panel.
6. The display panel driver of claim 5, wherein the timing controller stores a first correspondence relationship between a first target gray-scale value, a second target gray-scale value, and a charging period of time;
the time schedule controller is used for: and acquiring corresponding charging time from a first corresponding relation according to the first target gray-scale value of the p-th light-emitting unit in the Nth row and the second target gray-scale value of the p-th light-emitting unit in the 1 st row, wherein the charging time is used as the conducting time of the p-th first switch before the scanning lines sequentially output scanning signals when the display panel displays the next frame of image.
7. The display panel driver of claim 6, wherein the on-time period is longer the larger a difference obtained by subtracting the first target gray scale value from the second target gray scale value in the first correspondence relationship.
8. The display panel driver of claim 5, wherein the timing controller stores a second correspondence relationship between a second target gray-scale value and a driving time period;
the timing controller is further configured to: and after the image data of the next frame image of the current frame image is acquired, acquiring corresponding driving time length from a second corresponding relation according to a second target gray-scale value of the p-th light-emitting unit in the ith row as the conducting time length of the p-th first switch when the ith second switch in the N second switches is conducted.
9. The display panel driver of claim 1, wherein each of the plurality of first switches is a P-type MOS transistor.
10. A display device comprising a display panel and the display panel driver according to any one of claims 1 to 9;
the display panel includes a plurality of scan lines, a plurality of driving lines, and a plurality of light emitting units, each of the plurality of light emitting units is connected to one of the plurality of scan lines and one of the plurality of driving lines, and the driving lines connected to the plurality of light emitting units connected to the same scan line are different.
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