CN116665593A - Pixel driving circuit, driving method and display panel - Google Patents
Pixel driving circuit, driving method and display panel Download PDFInfo
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- CN116665593A CN116665593A CN202310602853.1A CN202310602853A CN116665593A CN 116665593 A CN116665593 A CN 116665593A CN 202310602853 A CN202310602853 A CN 202310602853A CN 116665593 A CN116665593 A CN 116665593A
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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]
- G09G3/3225—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] using an active matrix
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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]
- G09G3/3225—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] using an active matrix
- G09G3/3258—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] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The application discloses a pixel driving circuit, a driving method and a display panel, wherein a current adjusting module is arranged between a first transistor of the pixel driving circuit and a power line, a first input end of the current adjusting module is connected with a power voltage output end through the power line, a second input end of the current adjusting module is connected with a compensation voltage module, a control end of the current adjusting module is connected with a current gate line connected with the pixel driving circuit, and an output end of the current adjusting module is connected with an input end of the first transistor; the compensation voltage module calculates a compensation voltage value according to the length from each pixel driving circuit to a power line of the power voltage output end, and controls the current output by the current adjustment module according to the compensation voltage value so as to control the luminous brightness of the luminous element. The application adjusts the current entering the light-emitting element before the voltage of the power line enters the pixel driving circuit, controls and changes the light-emitting current input into the light-emitting element, and improves the uneven brightness caused by voltage drop formed by different line resistances due to different lengths of the power line.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a pixel driving circuit, a driving method, and a display panel.
Background
With the development of display technology, an organic light emitting diode (Organic Light Emitting Diode, OLED) display has advantages of high brightness, wide viewing angle, fast response speed, low power consumption, and the like, and also has advantages of simple manufacturing process, low cost, low power consumption, easy realization of flexible display, and the like, compared with a liquid crystal display, and has been widely used in the field of high-performance display at present.
Although the OLED display device has the above advantages, there are many problems that extend during the application process, for example, the led power supply will be shunted to the OLED in the previous row after the previous row is turned on due to the line resistance R of the power supply line, the current is I1, the power supply of the next row will not be the led, but the led vdd-I1R, and similarly, each of the following rows will be the same, which will cause the power supply voltage to become gradually smaller, resulting in uneven brightness display.
Disclosure of Invention
The application aims to provide a pixel driving circuit, a driving method and a display panel, which are used for controlling and changing the light-emitting current of an input light-emitting element and improving uneven brightness.
The application discloses a pixel driving circuit, which comprises a first transistor, a second transistor, a first storage capacitor, a light-emitting element and a current adjusting module, wherein the input end of the first transistor is connected with a power supply voltage output end through a power supply wire, and the control end of the first transistor is connected with the output end of the second transistor; the input end of the second transistor is connected with the data line, and the control end of the second transistor is connected with the gate line; the first storage capacitor is arranged between the control end and the input end of the first transistor; the anode of the light-emitting element is connected with the output end of the first transistor, and the cathode of the light-emitting element is connected with a first level signal; the current adjusting module is arranged between the first transistor and the power line, a first input end of the current adjusting module is connected with a power voltage output end through the power line, a second input end of the current adjusting module is connected with a compensation voltage module, a control end of the current adjusting module is connected with a current gate line connected with the pixel driving circuit, and an output end of the current adjusting module is connected with an input end of the first transistor; the compensation voltage module calculates a compensation voltage value according to the length from each pixel driving circuit to the power line of the power voltage output end, and controls the current output by the current adjustment module according to the compensation voltage value so as to control the light-emitting brightness of the light-emitting element.
Optionally, the current adjusting module includes a third transistor, a fourth transistor and a second storage capacitor, where a control end of the third transistor is connected to the gate line, an input end of the third transistor is connected to the compensation voltage module, an output end of the third transistor is connected to a control end of the fourth transistor, an input end of the fourth transistor is connected to a power supply voltage output end through a power supply line, and an output end of the fourth transistor is connected to an input end of the first transistor; the second storage capacitor is arranged between the control end and the input end of the fourth transistor; when the grid line of each row of pixel driving circuits is opened, the third transistor is conducted, the compensation voltage module outputs corresponding compensation voltage to the second storage capacitor for charging, so that the opening degree of the fourth transistor is controlled, and the current input to the light-emitting element by the power line is controlled.
Optionally, the compensation voltage module is provided with a plurality of voltage compensation units, the plurality of voltage compensation units are respectively connected to the input end of the third transistor in each pixel driving circuit in a one-to-one correspondence manner, the voltage value output by the corresponding voltage compensation unit is sequentially increased from the third transistor close to the power supply voltage output end to the third transistor far away from the power supply voltage output end, and the opening degree of the fourth transistor is larger.
Optionally, the pixel driving circuit further includes a resistance detection module, where the resistance detection module is connected to the compensation voltage module, and the resistance detection module is configured to detect a line resistance value of a power line between the pixel driving circuit and the power voltage output end, input the detected line resistance value to the compensation voltage module, and obtain a compensation voltage through a preset calculation formula, and output the compensation voltage.
Optionally, the pixel driving circuit further includes a fifth transistor, a sixth transistor, a seventh transistor, an eighth transistor, a ninth transistor, and a third storage capacitor; the control end of the fifth transistor is connected with a radiation line, the input end of the fifth transistor is connected with the output end of the fourth transistor, and the output end of the fifth transistor is connected with the output end of the second transistor; the control end of the sixth transistor is connected with the grid line, the input end of the sixth transistor is connected with the first storage capacitor, and the output end of the sixth transistor is connected with the output end of the first transistor; the control end of the seventh transistor is connected with the emitting line, the output end of the seventh transistor is connected with the anode of the light emitting element, and the input end of the seventh transistor is connected with the output end of the first transistor; the control end of the eighth transistor is connected with the gate line of the previous row, the output end of the eighth transistor is connected with the anode of the light-emitting element, and the output end of the eighth transistor is connected with a second level signal; and the control end of the ninth transistor is connected with the gate line of the previous row, the output end of the ninth transistor is connected to the output end of the fourth transistor through the third storage capacitor, and the input end of the ninth transistor is connected with the second level signal.
Optionally, the pixel driving circuit further includes a resistance detection module, the resistance detection module is connected with the compensation voltage module, the display panel further includes a timing module and a line counter, the line counter is connected with the compensation voltage module, the timing module is connected with the resistance detection module, and the line counter is used for counting the current line number; when the timing time of the timing module is longer than the preset time, controlling all the resistance detection modules to work, and detecting the line resistance value of the power line between each pixel driving circuit and the power voltage output end; when the timing duration of the timing module is less than or equal to the preset duration, any one resistor detection module is controlled to detect the line resistance value of the power line between the pixel driving circuit and the power voltage output end corresponding to the operation, the detected line resistance value is input to the compensation voltage module, the compensation voltage is obtained through a preset calculation formula and is output, and the compensation voltage module calculates the compensation voltage of other pixel driving circuits according to the detected line resistance value and the corresponding line number.
The application also discloses a driving method for driving the pixel driving circuit according to any one of the above, the driving method comprising the steps of:
inputting a gate signal to the control end of the second transistor and the control end of the current regulation module to control the second transistor and the current regulation module to be conducted;
inputting a data signal to a control end of the first transistor to control the first transistor to be turned on;
and inputting compensation voltage to the current adjustment module, generating a corresponding current value, inputting the corresponding current value to the light-emitting element, and controlling the light-emitting element to emit light.
Optionally, the step of inputting the compensation voltage to the current adjustment module, generating a corresponding current value and inputting the current value to the light emitting element, and controlling the light emitting element to emit light includes:
detecting the resistance value of a power line between each pixel driving circuit and a power voltage input end;
the voltage compensation circuit generates compensation voltage according to the resistance value;
the current adjusting module receives the generated compensation voltage, generates a corresponding current value and inputs the corresponding current value to the light-emitting element, and controls the light-emitting element to emit light.
Optionally, the step of inputting the compensation voltage to the current adjustment module, generating a corresponding current value, inputting the current value to the light emitting element, and controlling the light emitting element to emit light further includes the steps of:
detecting a current frame picture, comparing the current frame picture with a stored preset picture, calculating the brightness difference of each row of pixels, and controlling a grid line corresponding to the current row of pixels to stop inputting the grid signal at preset time when the next frame is displayed if the brightness difference of the current row of pixels in the current frame picture and the preset picture is larger than a preset value so that the pixel compensation circuit stops receiving the data signal.
The application also discloses a display panel which comprises the pixel driving circuit, a plurality of grid lines, a plurality of data lines and a power line, wherein each pixel driving circuit comprises a plurality of signal input ends which are respectively connected with a corresponding grid line, a corresponding data line and a corresponding power line.
Compared with the scheme of changing the data voltage, the application does not need to carry out calculation change on the data voltage, a current adjusting module is arranged between the input end of the pixel compensating circuit and the input end of the power supply voltage, controls the current input to the light emitting element, improves the uneven brightness of the display panel, compensates from the source, has small calculated amount compared with the scheme of adjusting the data voltage to compensate the error generated by the power supply line resistance, and does not need to continuously adjust the data voltage at different times so as to adjust the light emitting current of the light emitting element, thereby improving the uneven brightness of the display panel and reducing the adjustment time length and the adjustment error.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is evident that the figures in the following description are only some embodiments of the application, from which other figures can be obtained without inventive effort for a person skilled in the art. In the drawings:
fig. 1 is a schematic diagram of a pixel driving circuit according to a first embodiment of the present application;
fig. 2 is a schematic diagram of a pixel driving circuit according to a second embodiment of the present application;
fig. 3 is a schematic diagram of a pixel driving circuit according to a third embodiment of the present application;
fig. 4 is a schematic diagram of a pixel driving circuit structure according to a fourth embodiment of the present application;
fig. 5 is a flow chart of a driving method according to a fifth embodiment of the present application;
fig. 6 is a flow chart of a driving method according to a sixth embodiment of the present application;
fig. 7 is a flow chart of a driving method of a seventh embodiment of the present application;
fig. 8 is a schematic structural view of a display panel according to an eighth embodiment of the present application.
100 parts of a display panel; 110. a compensation voltage module; 111. a voltage compensation unit; 120. a power line; 130. a timing module; 140. a line counter; 150. a gate line; 160. a data line; 200. a pixel driving circuit; 210. a current adjustment module; 220. a resistance detection module;
m1, a first transistor; m2, a second transistor; m3, a third transistor; m4, a fourth transistor; m5, fifth transistors; m6, sixth transistor; m7, seventh transistor; m8, eighth transistor; m9, a ninth transistor; c1, a first storage capacitor; c2, a second storage capacitor; c3, a third storage capacitor; r, line resistance; an OLED, a light emitting element; gn, gate lines; dn, data line; en, emission line.
Detailed Description
It is to be understood that the terminology used herein, the specific structural and functional details disclosed are merely representative for the purpose of describing particular embodiments, but that the application may be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.
The application is described in detail below with reference to the attached drawings and alternative embodiments.
As shown in fig. 1, as a first embodiment of the present application, a pixel driving circuit 200 of a display panel is disclosed, the pixel driving circuit 200 includes a first transistor M1, a second transistor M2, a first storage capacitor C1, a light emitting element OLED, and a current adjusting module 210, an input terminal of the first transistor M1 is connected to a power supply voltage output terminal VDD through a power supply line 120, and a control terminal is connected to an output terminal of the second transistor M2; the input end of the second transistor M2 is connected with the data line Dn, and the control end is connected with the gate line Gn; the first storage capacitor C1 is disposed between the control terminal and the input terminal of the first transistor M1; the anode of the light-emitting element is connected with the output end of the first transistor M1, and the cathode of the light-emitting element is connected with a first level signal; the current adjustment module 210 is disposed between the first transistor M1 and the power line 120, a first input end of the current adjustment module 210 is connected to a power voltage output end through the power line 120, a second input end is connected to a compensation voltage module 110, a control end is connected to a current gate line Gn connected to the pixel driving circuit 200, and an output end is connected to an input end of the first transistor M1; wherein the lengths of the power lines 120 from each pixel driving circuit 200 to the power voltage output end in the display panel 100 are different, the compensation voltage module 110 calculates a compensation voltage value according to the lengths of the power lines 120 from each pixel driving circuit 200 to the power voltage output end, and controls the magnitude of the current output by the current adjustment module 210 according to the compensation voltage value so as to control the light emitting brightness of the light emitting element.
The application considers that the lengths of the power supply lines 120 with the power supply voltage input ends connected to the corresponding pixel driving circuits 200 are different, the lengths are different, and the resistances R of the line resistances are different, so that the power supply voltages input by the pixel driving circuits 200 at each stage are different, voltage drop is generated, and the problem of uneven brightness is caused; in general, the OLED power lines 120 of the same column have different power voltages to each row due to different near-end and far-end impedances, so that the power voltages connected to each row have a voltage difference, which causes the pixels corresponding to the pixel driving circuits 200 of different rows to display a deviation. Based on this, in the present application, a current adjusting circuit is disposed between the input end of the first transistor M1 of each pixel driving circuit 200 and the power line 120, so as to control the current flowing in this stage, so that the current of the constant current source is adjusted, the compensation voltage module 110 calculates the compensation voltage value according to the length from the pixel driving circuit 200 corresponding to each row of gate lines Gn to the power line 120 of the power voltage output end, and for the voltage gradually decreases from the first stage to the last stage, the current of the first stage is minimum, and increases stepwise, and only once calculation is needed, so that the output compensation voltage can be fixed, and the problem of uneven OLED image brightness caused by the impedance voltage drop of the power line 120 is solved.
As shown in fig. 2, as a further refinement of the first embodiment of the present application, the current adjustment module 210 includes a third transistor M3, a fourth transistor M4, and a second storage capacitor C2, where a control end of the third transistor M3 is connected to the gate line Gn, an input end is connected to the compensation voltage module 110, an output end is connected to a control end of the fourth transistor M4, an input end of the fourth transistor M4 is connected to a power voltage output end through a power line 120, and an output end is connected to an input end of the first transistor M1; the second storage capacitor C2 is disposed between the control terminal and the input terminal of the fourth transistor M4; when the gate line Gn of each row of pixel driving circuits 200 is turned on, the third transistor M3 is turned on, the compensation voltage module 110 outputs a corresponding compensation voltage to the second storage capacitor C2 for charging, so as to control the opening degree of the fourth transistor M4, thereby controlling the magnitude of the current input to the light emitting element by the power line 120, and the first transistor M1 and the fourth transistor M4 are driving transistors.
When each pixel driving circuit 200 performs driving display, the gate line Gn inputs a gate signal to control and turn on the second transistor M2, so as to charge the first storage capacitor C1 or the control end of the first transistor M1, meanwhile, the control end of the third transistor M3 of the current adjustment module 210 receives the gate signal to turn on, the compensation voltage module 110 outputs a voltage to the control end of the fourth transistor M4 via the third transistor M3, and simultaneously charges the second storage capacitor C2, the opening degree of the fourth transistor M4 is controlled by the second storage capacitor C2, when the electric quantity of the second storage capacitor C2 is larger, the opening degree of the fourth transistor M4 is larger, the current on the power line 120 can input a larger current value to the light emitting element, and otherwise, the current on the power line 120 can input a smaller current value to the light emitting element, so as to adjust the brightness of the light emitting element; in general, the line resistances of the pixel driving circuits 200 are different, so that the voltage values output by the corresponding compensation voltage modules 110 are different, the amounts of electricity charged into the second storage capacitors C2 are different, and the opening degrees of the fourth transistors M4 are different.
Generally, we can set a compensation voltage module 110, which is connected to the compensation voltage value outputted by the control through the internal resistor, and the compensation voltages of the pixel driving circuits 200 corresponding to different columns need to be adjusted in real time, but the real-time adjustment requirement is high, and the reaction rate requirement is also high; the compensation voltage module 110 is usually provided with a plurality of voltage compensation units 111, the plurality of voltage compensation units 111 are respectively connected to the input ends of the third transistors M3 in each pixel driving circuit 200 in a one-to-one correspondence manner, the voltage values output by the corresponding voltage compensation units 111 sequentially increase from the third transistor M3 close to the power supply voltage output end to the third transistor M3 far from the power supply voltage output end, and the fourth transistor M4 is opened more; the pixel driving circuits 200 on each column correspond to different voltage compensation units 111, when the current pixel driving circuit 200 is driven, the voltage compensation unit 111 corresponding to the next pixel driving circuit 200 already calculates the corresponding compensation voltage, and when the next pixel driving circuit 200 is driven, the calculated compensation voltage is directly output.
In addition, for the OLED panel with poor manufacturing process, if the uniformity is poor, the distribution of the resistors may be uneven, and a plurality of resistance detection modules 220 may be added, where the resistance detection modules 220 are connected to the compensation voltage module 110, the resistance detection modules 220 are configured to detect the line resistance R of the power line 120 between the pixel driving circuit 200 and the power supply voltage output terminal, and input the measured line resistance to the compensation voltage module 110, and obtain the compensation voltage through a preset calculation formula to output, and generally, assume that the power of the OLED is P, p=ui, where U is the differential pressure between the anode and the cathode of the OLED, and I is the light emitting current of the OLED; when the power is constant or the light-emitting brightness is low, the power is high, and the charge quantity DeltaQ=C, deltaV=I, deltat in the second storage capacitor C2 which is in complementary control charge is high; the Δv is the difference between the voltage actually received by the current pixel driving circuit 200 and the power supply voltage, Δt is the charging time of the second storage capacitor C2, and the plurality of resistance detection modules 220 can better feed back the equivalent resistance of the entire power line 120, so that the control center is collected after the detection of the equivalent resistance of each stage, and the corresponding correction value is called when the detection is finished, so that the problem of the voltage difference of the power line 120 can be solved.
As shown in fig. 3, as a third embodiment of the present application, the present application can be applied to a basic 2T1C circuit architecture, and also to other circuit architectures, the present embodiment is exemplified by a 7T2C architecture, and the pixel driving circuit 200 further includes a fifth transistor M5, a sixth transistor M6, a seventh transistor M7, an eighth transistor M8, a ninth transistor M9, and a third storage capacitor C3; the control end of the fifth transistor M5 is connected with a radiation En, the input end of the fifth transistor M5 is connected with the output end of the fourth transistor M4, and the output end of the fifth transistor M5 is connected with the output end of the second transistor M2; the control end of the sixth transistor M6 is connected with the grid line Gn, the input end of the sixth transistor M6 is connected with the first storage capacitor C1, and the output end of the sixth transistor M1 is connected with the output end of the first transistor; the control end of the seventh transistor M7 is connected with the emitting line En, the output end of the seventh transistor M7 is connected with the anode of the light emitting element, and the input end of the seventh transistor M7 is connected with the output end of the first transistor M1; the control end of the eighth transistor M8 is connected with the upper row of gate lines Gn, the output end of the eighth transistor M8 is connected with the anode of the light-emitting element, and the output end of the eighth transistor M8 is connected with a second level signal; the control end of the ninth transistor M9 is connected to the gate line Gn of the previous row, the output end is connected to the output end of the fourth transistor M4 through the third storage capacitor C3, the input end is connected to the second level signal, and the first level signal and the second level signal are both the low level signal Vref.
The current adjustment module 210 of the present application is disposed between the input end of the pixel driving circuit 200 and the power line 120, and compensates the current input to the light emitting element by the power line 120 before each pixel driving circuit 200 drives and displays the pixels, so as to control the current level of the pixel driving voltage input to the light emitting element, and the adjustment and change of the time sequence of the pixel driving voltage with different structures are not needed, so that the problem of uneven brightness of the OLED image caused by the impedance voltage drop of the power line 120 is solved by the minimum calculation amount and the minimum circuit change, and the present application has high precision, can adaptively compensate, and can be compatible with different manufacturing conditions.
As shown in fig. 4, which is a further refinement and improvement of any of the above embodiments, the pixel driving circuit 200 further includes a resistance detection module 220, the resistance detection module 220 is connected to the compensation voltage module 110, the display panel further includes a timing module 130 and a line counter 140, the line counter 140 is connected to the compensation voltage module 110, the timing module 130 is connected to the resistance detection module 220, and the line counter 140 is used for counting the current line number; when the timing duration of the timing module 130 is longer than the preset duration, controlling all the resistance detection modules 220 to operate, and detecting the line resistance value of the power line 120 between each pixel driving circuit 200 and the power voltage output terminal; when the timing duration of the timing module 130 is less than or equal to the preset duration, any one of the resistor detection modules 220 is controlled to work to correspondingly detect the line resistance value of the power line 120 between the pixel driving circuit 200 and the power voltage output end, the measured line resistance value is input to the compensation voltage module 110, the compensation voltage is obtained through a preset calculation formula and is output, and the compensation voltage module 110 calculates the compensation voltages of other pixel driving circuits 200 according to the detected line resistance value and the corresponding line number.
Generally, in a short period of time when the display panel is used, the resistances of the power lines 120 corresponding to the pixel driving circuits 200 on the same column of the data line Dn are uniformly changed, and in this period of time, if the brightness is uneven, the resistance detection module 220 can detect the magnitudes of partial resistances, so that the magnitudes of the resistances of the other pixel driving circuits 200 can be calculated in consideration of the number of rows where the detected resistances correspond to the pixel driving circuits 200 (for example, the resistances of the power lines 120 of the pixel driving circuits 200 on the second row are R, the resistances of the power lines 120 of the pixel driving circuits 200 on the third row are 2R, and so on), so that the detection of the resistances of the power lines 120 is not required for all the pixel driving circuits 200; however, if the usage time is long, in consideration of some problems of aging, the resistances of the power lines 120 corresponding to each pixel driving circuit 200 may be different, and all the resistance detection modules 220 are controlled to operate, so as to detect the resistances of the power lines 120 between each pixel driving circuit 200 and the power voltage output terminal, so as to generate corresponding compensation voltages to be input to the current adjustment module 210, adjust the current magnitude of the current input to the light emitting element on the control power line 120, and further adjust the brightness non-uniformity caused by voltage drop.
As shown in fig. 5, as a fifth embodiment of the present application, the present application also discloses a driving method for driving the pixel driving circuit as described in any one of the above, the driving method comprising the steps of:
s1: inputting a gate signal to the control end of the second transistor and the control end of the current regulation module to control the second transistor M2 and the current regulation module to be conducted;
s2: inputting a data signal to a control end of the first transistor to control the first transistor to be turned on;
s3: and inputting compensation voltage to the current adjustment module, generating a corresponding current value, inputting the corresponding current value to the light-emitting element, and controlling the light-emitting element to emit light.
Referring to fig. 2, a gate signal is simultaneously input to the second transistor M2 of the pixel driving circuit 200 and the current adjusting module 210, the second transistor M2 is turned on to be connected with a data signal, the data signal is output to the control end of the first transistor M1 through the second transistor M2, the opening of the first transistor M1 is controlled, the data signal voltage charges the first storage capacitor C1, and further the opening degree of the first transistor M1 is controlled, after the current adjusting module 210 is turned on by the gate signal, a compensation voltage is received, and the compensation voltage controls the current adjusting module 210 to adjust the current of the power line 120 to generate a current different from the current on the power line 120, so as to output the current to the light emitting element, so as to change the original light emitting current of the light emitting element, control the brightness of the light emitting element, and reduce the brightness non-uniformity caused by voltage drop.
Further, as shown in fig. 6, as a sixth embodiment of the present application, a further improvement of the above fifth embodiment is that the step S3 includes:
s31: detecting the resistance value of a power line between each pixel driving circuit and a power voltage input end;
s32: the voltage compensation circuit generates compensation voltage according to the resistance value;
s33: the current adjusting module receives the generated compensation voltage, generates a corresponding current value and inputs the corresponding current value to the light-emitting element, and controls the light-emitting element to emit light.
Referring to fig. 3 and 6, in the present embodiment, the input value of the compensation voltage is not a random input value, but is calculated, the resistance detection module 220 detects the resistance value of the power line 120 between each pixel driving circuit 200 and the power voltage input terminal, and inputs the measured line resistance value to the compensation voltage module 110, and obtains the compensation voltage for output through a preset calculation formula; assuming that the power of the OLED and the like is P, p=ui, where U is the differential pressure of the anode and the cathode of the OLED, and I is the emission current of the OLED; when the power is constant or the light-emitting brightness is low, the power is high, and the charge quantity DeltaQ=C, deltaV=I, deltat in the second storage capacitor C2 which is in complementary control charge is high; the Δv is the difference between the voltage actually received by the current pixel driving circuit 200 and the power supply voltage, Δt is the charging time of the second storage capacitor C2, and the plurality of resistance detection modules 220 can better feed back the equivalent resistance of the entire power line 120, so that the control center is collected after the detection of the equivalent resistance of each stage, and the corresponding correction value is called when the detection is finished, so that the problem of the voltage difference of the power line 120 can be solved.
As shown in fig. 7, as a seventh embodiment of the present application, the driving method of any of the above embodiments is modified, and in step S3, a verification adjustment step is reset, and specifically, after step S3, the method further includes the steps of:
s4: detecting a current frame picture, comparing the current frame picture with a stored preset picture, calculating the brightness difference of each row of pixels, and controlling a grid line corresponding to the current row of pixels to stop inputting the grid signal at preset time when the next frame is displayed if the brightness difference of the current row of pixels in the current frame picture and the preset picture is larger than a preset value so that the pixel driving circuit stops receiving the data signal.
Referring to fig. 1 and 2, in this embodiment, if an error occurs during the generation of the compensation voltage, the compensation voltage may be inaccurate, so that the current output to the OLED by the current adjustment module 210 may be problematic, and the problem of uneven brightness may still exist, so that the detection of the picture is performed to determine whether the compensation is accurate; if the adjustment is accurate, the adjustment is needed again if the adjustment is not accurate, but the adjustment of the embodiment is mainly performed according to the time sequence of the gate signal, so that the input of the gate signal can be controlled to stop at a preset time by controlling the gate signal on the gate line Gn to be output to the control end of the second transistor M2 to control the on-time of the second transistor M2, so as to control the time when the data voltage on the data line Dn is input to the control end of the first transistor M1 to control the voltage of the control end of the first transistor M1 or the voltage of the first storage capacitor C1, adjust the light-emitting current of the light-emitting element OLED to an ideal current, avoid the gradual decrease of the power supply voltage, and avoid the uneven brightness display caused by the excessively large difference between the light-emitting current of the OLED on the light-emitting element.
It should be noted that, the limitation of each step in the present solution is not to be considered as limiting the sequence of steps on the premise of not affecting the implementation of the specific solution, and the steps written in the previous step may be executed before, or executed after, or even executed simultaneously, so long as the implementation of the present solution is possible, all the steps should be considered as falling within the protection scope of the present application.
As shown in fig. 8, the present application further discloses a display panel 100, where the display panel 100 includes the pixel driving circuit 200 as described in any one of the above, and the display panel 100 further includes a plurality of gate lines 150, a plurality of data lines 160, and a power line 120, and each of the pixel driving circuits 200 includes a plurality of signal input terminals respectively connected to a corresponding one of the gate lines 150, one of the data lines 160, and the power line 120.
Referring to fig. 2 and 8, an OLED display panel 100 includes a plurality of pixel driving circuits 200, each pixel driving circuit 200 compensates, eliminates bad factors such as threshold voltage drift of driving transistors of each pixel driving circuit 200, and OLED aging, and compensates for the display problems faced by the existing 2T 1C; the problem of inconsistent OLED luminous current is solved, the uniformity of display brightness is improved, and the display picture effect is enhanced.
It should be noted that, the inventive concept of the present application can form a very large number of embodiments, but the application documents are limited in space and cannot be listed one by one, so that on the premise of no conflict, the above-described embodiments or technical features can be arbitrarily combined to form new embodiments, and after the embodiments or technical features are combined, the original technical effects will be enhanced.
The technical scheme of the application can be widely applied to various display panels, such as TN (Twisted Nematic) display panels, IPS (In-Plane Switching) display panels, VA (Vertical Alignment) display panels, MVA (Multi-Domain Vertical Alignment) display panels, and of course, other types of display panels, such as OLED (Organic Light-Emitting Diode) display panels, can be also applied to the scheme.
The above description of the application in connection with specific alternative embodiments is further detailed and it is not intended that the application be limited to the specific embodiments disclosed. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the application, and these should be considered to be within the scope of the application.
Claims (10)
1. A pixel driving circuit of a display panel, comprising:
the input end of the first transistor is connected with the power supply voltage output end through a power line, and the control end of the first transistor is connected with the output end of the second transistor;
the input end of the second transistor is connected with the data line, and the control end of the second transistor is connected with the gate line;
the first storage capacitor is arranged between the control end and the input end of the first transistor;
the anode of the light-emitting element is connected with the output end of the first transistor, and the cathode of the light-emitting element is connected with a first level signal; and
the current adjusting module is arranged between the first transistor and the power line, a first input end of the current adjusting module is connected with a power voltage output end through the power line, a second input end of the current adjusting module is connected with a compensation voltage module, a control end of the current adjusting module is connected with a current gate line connected with the pixel driving circuit, and an output end of the current adjusting module is connected with an input end of the first transistor;
the compensation voltage module calculates a compensation voltage value according to the length from each pixel driving circuit to the power line of the power voltage output end, and controls the current output by the current adjustment module according to the compensation voltage value so as to control the light-emitting brightness of the light-emitting element.
2. The pixel driving circuit according to claim 1, wherein the current adjusting module comprises a third transistor, a fourth transistor and a second storage capacitor, the control terminal of the third transistor is connected to the gate line, the input terminal is connected to the compensation voltage module, the output terminal is connected to the control terminal of the fourth transistor, the input terminal of the fourth transistor is connected to the power supply voltage output terminal through a power supply line, and the output terminal is connected to the input terminal of the first transistor; the second storage capacitor is arranged between the control end and the input end of the fourth transistor;
when the grid line of each row of pixel driving circuits is opened, the third transistor is conducted, the compensation voltage module outputs corresponding compensation voltage to the second storage capacitor for charging, so that the opening degree of the fourth transistor is controlled, and the current input to the light-emitting element by the power line is controlled.
3. The pixel driving circuit according to claim 2, wherein the compensation voltage module is provided with a plurality of voltage compensation units, the plurality of voltage compensation units are respectively connected to the input ends of the third transistors in each pixel driving circuit in a one-to-one correspondence manner, the voltage values output by the corresponding voltage compensation units sequentially increase from the third transistor close to the power supply voltage output end to the third transistor far from the power supply voltage output end, and the opening degree of the fourth transistor is larger.
4. A pixel driving circuit according to claim 2 or 3, further comprising a resistance detection module, wherein the resistance detection module is connected to the compensation voltage module, and the resistance detection module is configured to detect a line resistance value of a power line between the pixel driving circuit and the power voltage output terminal, input the detected line resistance value to the compensation voltage module, and obtain a compensation voltage through a preset calculation formula for output.
5. The pixel driving circuit according to claim 2, wherein the pixel driving circuit further comprises a fifth transistor, a sixth transistor, a seventh transistor, an eighth transistor, a ninth transistor, and a third storage capacitor;
the control end of the fifth transistor is connected with a radiation line, the input end of the fifth transistor is connected with the output end of the fourth transistor, and the output end of the fifth transistor is connected with the output end of the second transistor; the control end of the sixth transistor is connected with the grid line, the input end of the sixth transistor is connected with the first storage capacitor, and the output end of the sixth transistor is connected with the output end of the first transistor; the control end of the seventh transistor is connected with the emitting line, the output end of the seventh transistor is connected with the anode of the light emitting element, and the input end of the seventh transistor is connected with the output end of the first transistor; the control end of the eighth transistor is connected with the gate line of the previous row, the output end of the eighth transistor is connected with the anode of the light-emitting element, and the output end of the eighth transistor is connected with a second level signal; and the control end of the ninth transistor is connected with the gate line of the previous row, the output end of the ninth transistor is connected to the output end of the fourth transistor through the third storage capacitor, and the input end of the ninth transistor is connected with the second level signal.
6. The pixel driving circuit according to claim 2, further comprising a resistance detection module connected to the compensation voltage module, wherein the display panel further comprises a timing module connected to the compensation voltage module and a line counter connected to the resistance detection module for counting a current number of lines;
when the timing time of the timing module is longer than the preset time, controlling all the resistance detection modules to work, and detecting the line resistance value of the power line between each pixel driving circuit and the power voltage output end;
when the timing duration of the timing module is less than or equal to the preset duration, any one resistor detection module is controlled to detect the line resistance value of the power line between the pixel driving circuit and the power voltage output end corresponding to the operation, the detected line resistance value is input to the compensation voltage module, the compensation voltage is obtained through a preset calculation formula and is output, and the compensation voltage module calculates the compensation voltage of other pixel driving circuits according to the detected line resistance value and the corresponding line number.
7. A driving method for driving the pixel driving circuit according to any one of claims 1 to 6, comprising the steps of:
inputting a gate signal to the control end of the second transistor and the control end of the current regulation module to control the second transistor and the current regulation module to be conducted;
inputting a data signal to a control end of the first transistor to control the first transistor to be turned on;
and inputting compensation voltage to the current adjustment module, generating a corresponding current value, inputting the corresponding current value to the light-emitting element, and controlling the light-emitting element to emit light.
8. The driving method of claim 7, wherein the step of inputting the compensation voltage to the current adjustment module to generate a corresponding current value to be inputted to the light emitting element, and controlling the light emitting element to emit light comprises:
detecting the resistance value of a power line between each pixel driving circuit and a power voltage input end;
the voltage compensation circuit generates compensation voltage according to the resistance value;
the current adjusting module receives the generated compensation voltage, generates a corresponding current value and inputs the corresponding current value to the light-emitting element, and controls the light-emitting element to emit light.
9. The driving method of claim 7, wherein the step of inputting the compensation voltage to the current adjustment module to generate a corresponding current value to be input to the light emitting element, and controlling the light emitting element to emit light further comprises the steps of:
detecting a current frame picture, comparing the current frame picture with a stored preset picture, calculating the brightness difference of each row of pixels, and controlling a grid line corresponding to the current row of pixels to stop inputting the grid signal at preset time when the next frame is displayed if the brightness difference of the current row of pixels in the current frame picture and the preset picture is larger than a preset value so that the pixel compensation circuit stops receiving the data signal.
10. A display panel comprising the pixel driving circuit according to any one of claims 1 to 7, further comprising a plurality of gate lines, a plurality of data lines, and a power supply line, each of the pixel driving circuits comprising a plurality of signal input terminals respectively connected to a corresponding one of the gate lines, the data lines, and the power supply line.
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| CN202310602853.1A CN116665593A (en) | 2023-05-25 | 2023-05-25 | Pixel driving circuit, driving method and display panel |
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