CN113674684B - Light emitting diode display panel and driving method thereof - Google Patents
Light emitting diode display panel and driving method thereof Download PDFInfo
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- CN113674684B CN113674684B CN202110980829.2A CN202110980829A CN113674684B CN 113674684 B CN113674684 B CN 113674684B CN 202110980829 A CN202110980829 A CN 202110980829A CN 113674684 B CN113674684 B CN 113674684B
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- 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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Abstract
A light emitting diode display panel and a driving method thereof, the driving method of the light emitting diode display panel includes: equally dividing the LED display panel along the scanning direction of the LED display panel to form a plurality of driving units, wherein each driving unit comprises a plurality of rows of pulse width modulation pixel circuits; and sequentially enabling each driving unit to form a scanning light-emitting interval of each driving unit; in the scanning light-emitting interval of each driving unit, the multiple rows of pulse width modulation pixel circuits in the driving unit are firstly selected in sequence to write in a piece of coherence data, and then pulse width modulation light-emitting is carried out simultaneously. Therefore, the risk of large driving current can be reduced when the display panel is driven in a pulse width modulation mode, and the design complexity of the driving circuit can be simplified.
Description
Technical Field
The present invention relates to a display panel and a driving method thereof, and more particularly, to a light emitting diode display panel driven by pulse width modulation and a driving method thereof.
Background
As the manufacturing technology of Light Emitting Diode (LED) display panels matures, the technology for driving the display panels is diversified, wherein the driving of the display panels by the pulse width modulation method may have the following advantages: the panel has high gray scale efficiency, excellent control of gray scale color cast of the panel, excellent color control, wide adjustable range of panel brightness and the like. But still has the risk problems of drive current accumulation, design complexity of the drive circuit and the like.
Disclosure of Invention
The light emitting diode display panel and the driving method thereof provided by the invention can reduce the risk of large driving current when the light emitting diode display panel is driven in a pulse width modulation mode, and simplify the design complexity of a driving circuit.
The light emitting diode display panel provided by the invention comprises a plurality of driving units which are formed by equally dividing along the scanning direction of the light emitting diode display panel, wherein each driving unit comprises a plurality of rows of pulse width modulation pixel circuits; and, each driving unit is enabled in sequence to form the scanning light-emitting interval of each driving unit; in the scanning light-emitting interval of each driving unit, the multi-row pulse width modulation pixel circuits of the driving units are firstly selected in sequence to write in a piece of coherence data, and then pulse width modulation light-emitting is carried out simultaneously.
The driving method of the light emitting diode display panel provided by the invention comprises the following steps: equally dividing the LED display panel along the scanning direction of the LED display panel to form a plurality of driving units, wherein each driving unit comprises a plurality of rows of pulse width modulation pixel circuits; and sequentially enabling the plurality of driving units to form a scanning light-emitting interval of each driving unit; in the scanning light-emitting interval of each driving unit, the multi-column pulse width modulation pixel circuits are firstly selected in sequence to write in a piece of coherence data, and then pulse width modulation light-emitting is carried out simultaneously.
In an embodiment of the invention, the led display panel further includes at least one slope signal selection circuit for sequentially enabling each driving unit, so that each row of pwm pixel circuits is sequentially selected to write the coherence data in a scan light emitting interval of each enabled driving unit, and a multi-slope signal is simultaneously input to enable each row of pwm pixel circuits to simultaneously perform pwm light emission.
In an embodiment of the invention, the slope signal selecting circuit includes: a first switch; a second switch; a third switch; a fourth switch; and a fifth switch; each switch has a first end, a second end and a control end for determining whether the first end and the second end are conducted, the first end of the first switch is used for receiving the multi-slope signal, the second end of the first switch, the second end of the second switch, the first end of the third switch, the first end of the fourth switch and the first end of the fifth switch are electrically connected to a first node, the first end of the second switch is used for receiving a first direct current voltage, and the second end of the third switch, the second end of the fourth switch and the second end of the fifth switch are used for receiving a second direct current voltage, wherein the first direct current voltage is different from the second direct current voltage.
In an embodiment of the invention, when the multiple rows of pwm pixel circuits are sequentially selected to write the coherence data, the first switch, the second switch, the third switch and the fifth switch of the slope signal selection circuit are turned off, and the control terminal of the fourth switch receives an enable signal of each row of pwm pixel circuits to turn on the fourth switch, so that the second terminal of the fourth switch receives the second dc voltage and inputs the second dc voltage to each row of pwm pixel circuits through the first node.
In an embodiment of the invention, when the multi-slope signals are simultaneously inputted to the multi-column pwm pixel circuits, the second switch, the third switch, the fourth switch, and the fifth switch of the slope signal selecting circuit are turned off, and the control terminal of the first switch receives a light-emitting signal of each driving unit to turn on the first switch, so that the first terminal of the first switch receives the multi-slope signals and inputs the multi-slope signals to the multi-column pwm pixel circuits through the first node.
In an embodiment of the invention, each of the pulse width modulation pixel circuits in the multiple rows of pulse width modulation pixel circuits includes a light emitting diode and a driving circuit connected to drive the light emitting diode.
The invention equally divides the LED display panel into a plurality of driving units by adopting the slope signal selection circuit, thereby reducing the risk of large driving current, reducing the number of scanning groups and simplifying the design complexity of the driving circuit when the LED display panel is driven in a pulse width modulation mode so as to improve the pixel density (PPI).
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a schematic diagram of an led display panel according to an embodiment of the invention;
fig. 2 is a schematic diagram of a driving unit equally divided along a scanning direction of an led display panel and a scanning driving light-emitting interval thereof according to an embodiment of the invention;
fig. 3 is a flowchart of a driving method of an led display panel according to an embodiment of the invention;
FIG. 4 is a circuit diagram of a slope signal selection circuit according to an embodiment of the present invention;
FIG. 5 is a timing diagram of scanning and light emission of the slope signal selection circuit provided in FIG. 4;
FIG. 6 is a diagram of a slope signal selection circuit and a PWM pixel circuit according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of the secondary emission interval of FIG. 6;
FIG. 8 is a schematic diagram of a slope signal selection circuit and a PWM pixel circuit according to another embodiment of the present invention;
FIG. 9 is a schematic diagram of the secondary emission interval of FIG. 8; and
FIG. 10 is a timing simulation verification diagram of FIG. 6.
Description of the reference numerals:
1. light emitting diode display panel
2. Sequential control circuit
3. Scanning drive circuit
4. Data driving circuit
5. Pulse width modulation pixel circuit
6. Slope signal selection circuit
51. Light emitting diode
52. Driving circuit
61. First switch
62. Second switch
63. Third switch
64. The fourth switch
65. Fifth switch
A1[ PZi ] first node
Unit 1-Unit 16 driving Unit
PZ 1-PZ 16 scanning light-emitting interval
SC1 SC 16 scanning area
EM 1-EM 16 light emitting regions
DATA _ PWM coherency DATA
G1 (PZi _ n) enable signal
G1 (PZi _ n-1) enable signal
G2 (PZi) Enable signal
DC _ L first direct current voltage
DC _ H second DC Voltage
EM [ PZ1] luminescence signal
EM [ PZi ] luminescence signal
EM [ PZ (i + 1) ] luminescence signal
EM [ PZ (i-1) ] luminescence signal
MSS multi-slope signal
PWM current pulse width modulation current
S1, S3 step
Detailed Description
Hereinafter, the present invention will be described in detail by illustrating various embodiments of the present invention through the accompanying drawings. The inventive concept may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. Moreover, in the drawings, like reference numerals may be used to designate similar elements.
Referring to fig. 1, a Light Emitting Diode (LED) display panel 1 according to the present invention includes a timing control circuit 2, a scan driving circuit 3, a data driving circuit 4, and M rows of pwm pixel circuits 5, wherein the timing control circuit is connected to the scan driving circuit 3 and the data driving circuit 4, and the M rows of pwm pixel circuits 5 are connected to the scan driving circuit 3 and the data driving circuit 4. The timing control circuit 2 is configured to control the scan driving circuit 3 and the data driver 4, the scan driving circuit 3 is configured to output scan pulses to drive scan lines in the led display panel 1 to load display data into corresponding pwm pixel circuits 5, the data driver 4 is configured to charge storage capacitors in the corresponding pwm pixel circuits 5 according to data voltages of the display data, and each pwm pixel circuit 5 in M rows in the led display panel 1 is configured to emit light according to the corresponding data voltages. The led display panel 1 includes M rows of the pulse width modulation pixel circuits 5, and for example, M =960 when the led display panel 1 has a resolution of 1920 × 960. For convenience of the following description, the led display panel 1 of fig. 1 includes 960 rows of pwm pixel circuits for illustration, but the number is not intended to limit the invention.
Referring to fig. 2 and 3, the led display panel 1 includes a plurality of driving units Unit1 to Unit x equally divided along the scanning direction of the led display panel 1, wherein each of the driving units Unit1 to Unit x includes a plurality of rows of pwm pixel circuits 5 (step S1), so that the upper limit of the current amount of each of the driving units Unit1 to Unit x is smaller than 10A. In the embodiment, the led display panel 1 is equally divided into 16 driving units Unit1 to Unit 16, but the number is not intended to limit the invention. Those skilled in the art should be able to design the led display panel according to practical requirements or applications, for example, the External Quantum Efficiency (EQE) of the led is 35 μ a, the total current of the display panel is 1920 × 960 × 35 μ a =64A, the led display panel 1 is equally divided into 16 driving units Unit1 to Unit 16, so that the current of each driving Unit1 to Unit 16 is 64A/16=4A, which is smaller than the current upper limit value. Therefore, accumulation of a large driving current of the light emitting diode display panel 1 can be avoided. Each of the driving units Unit1 to Unit 16 includes 60 (= 960/16) columns of pwm pixel circuits 5, each of the driving units Unit1 to Unit 16 is sequentially enabled to form scanning light-emitting intervals PZ1 to PZ16 of each of the driving units, each of the scanning light-emitting intervals PZ1 to PZ16 includes scanning areas SC1 to SC 16 and light-emitting areas EM 1 to EM 16, respectively, first each column of pwm pixel circuits 5 is sequentially selected in each of the scanning areas SC1 to SC 16 to write a row of pwm pixel circuits 5, and then each column of pwm pixel circuits 5 simultaneously performs pwm light-emitting in each of the light-emitting areas EM 1 to EM 16 (step S3), wherein the row of pwm pixel circuits 5 simultaneously performs pwm light-emitting in each of the light-emitting areas EM 1 to EM 16 (step S3). In addition, it is noted that the driving Unit1 has an operation of not writing data and pulse-width-modulation light emission in the scanning light-emitting interval PZ9, and the other driving units Unit 2 to Unit 16 also have the same operation, and the operation of this portion will be described later.
Referring to fig. 4 and 5, the led display panel 1 further includes at least one slope signal selection circuit 6 connected to the M rows of pwm pixel circuits 5 for sequentially enabling each of the driving units Unit1 to Unit 16, so that in each of the scan light-emitting intervals PZ1 to PZ16 of each of the enabled driving units Unit1 to Unit 16, the pwm pixel circuits 5 of each row are sequentially selected to write coherence data, and a multi-slope signal MSS (multi slope signal) is simultaneously input, so that the pwm pixel circuits 5 simultaneously perform pwm light-emitting. It should be noted that the slope signal selection circuit 6 of the present invention can divide the led display panel 1 into a plurality of driving units Unit1 to Unit 16, and divide the scanning light-emitting intervals PZ1 to PZ16 of each driving Unit into the scanning areas SC1 to SC 16 and the light-emitting areas EM 1 to EM 16, so as to reduce the risk of large driving current, reduce the number of scanning groups, and simplify the design complexity of the driving circuit when the led display panel is driven in a pulse width modulation manner, thereby increasing the pixel density. As shown in fig. 5, the slope signal selection circuit 6 enables the driving Unit1, so that the PWM pixel circuits 5 of 60 columns of the driving Unit1 are selected, and in the scanning zone SC1 of the scanning light-emitting section PZ1 of the drive Unit1, the pulse width modulation pixel circuits 5 of each column are sequentially selected to write the coherence DATA _ PWM, and in the light emission area EM 1 of the scan light emission section PZ1 of the drive Unit1, the pulse width modulation pixel circuits 5 of each column simultaneously input the multi-slope signal and perform pulse width modulation light emission. In addition, the process of enabling the other driving units Unit 2 to Unit 16 by the slope signal selection circuit 6 is the same as enabling the driving Unit1 by the slope signal selection circuit 6, and thus the description is omitted. It is to be noted that the driving Unit 9 has an operation of not writing data and pulse-width-modulation light emission in the scanning light-emission section PZ1, and the operation of this section will be described later.
The slope signal selection circuit 6 includes a first switch 61, a second switch 62, a third switch 63, a fourth switch 64, and a fifth switch 65. Each of the switches 61 to 65 has a first end, a second end, and a control end for determining whether the first end and the second end are turned on, the first end of the first switch 61 is used for receiving the multi-slope signal MSS, the second end of the first switch 61, the second end of the second switch 62, the first end of the third switch 63, the first end of the fourth switch 64, and the first end of the fifth switch 65 are electrically connected to the first node A1, the first end of the second switch 62 is used for receiving a first direct current voltage (DC _ L), the second end of the third switch 63, the second end of the fourth switch 64, and the second end of the fifth switch 65 are used for receiving a second direct current voltage (DC _ H), wherein the first direct current voltage (DC _ L) is different from the second direct current voltage (DC _ H).
In detail, when the pwm pixel circuits 5 of each column are sequentially selected to write coherence data, the first switch 61, the second switch 62, the third switch 63, and the fifth switch 65 of the slope signal selection circuit 6 are turned off, and the control terminal of the fourth switch 64 receives an enable signal G1 (PZi _ n) of each column of pwm pixel circuits to turn on the fourth switch 64, where i =1 to 16, n =1 to 60, so that the second terminal of the fourth switch 64 receives the second direct current voltage (DC _ H) and inputs the second direct current voltage (DC _ H) to each column of pwm pixel circuits 5 through the first node A1. When the 60 columns of pwm pixel circuits 5 are simultaneously inputted with the multi-slope signal MSS, the second switch 62, the third switch 63, the fourth switch 64 and the fifth switch 65 of the slope signal selection circuit 6 are turned off, and the control terminal of the first switch 61 receives a light-emitting signal EM [ PZ1] of the driving Unit1 to turn on the first switch 61, so that the first terminal of the first switch 61 receives the multi-slope signal MSS and inputs the multi-slope signal MSS to each column of pwm pixel circuits 5 through the first node A1.
Referring to fig. 6, the pwm pixel circuits 5 connected to the slope signal selection circuit 6 are only shown as an example, wherein each of the pwm pixel circuits 5 in each row respectively includes a light emitting diode 51 and a driving circuit 52 connected to drive the light emitting diode 51, however, the circuit structure, the number and the type of the components are not limited to the invention, and those skilled in the art can select or design different pwm pixel circuits according to actual requirements or applications. In this embodiment, the control terminal of the first switch 61 in the slope signal selection circuit 6 receives the light-emitting signals EM [ PZi ] of the driving units Unit1 to Unit 16, the control terminal of the second switch 62 receives the light-emitting signals EM [ PZ (i + 1) ] of the driving units Unit1 to Unit 16, the control terminal of the third switch 63 receives the light-emitting signals EM [ PZ (i-1) ] of the driving units Unit1 to Unit 16, the control terminal of the fourth switch 64 receives the enabling signal G1 (PZi _ n) of the current row of pwm pixel circuits 5 connected thereto, and the control terminal of the fifth switch 65 receives the enabling signal G1 (PZi _ n-1) of the previous row of pwm pixel circuits 5, where i =1 to 16, n =1 to 60.
Referring to fig. 7, when the luminance of the led display panel 1 is insufficient, the led display panel 1 must emit light again. However, the led display panel 1 of the present disclosure does not need to be loaded with the coherence DATA again, but the slope signal selection circuit 6 receives the emission signal EM [ PZ (i-1) ] of the previous driving Unit by using the control terminal of the third switch 63, so that the third switch 63 is turned on to input the second DC voltage (DC _ H) to each column of the PWM pixel circuits 5, and each column of the PWM pixel circuits 5 inputs the second DC voltage (DC _ H) again to perform the PWM emission again, the driving Unit1 as in fig. 2 does not write the coherency DATA _ PWM in the scanning area SC 9 of the scanning light-emitting interval PZ9 and performs the pulse width modulation light emission again in the light-emitting area EM 9, and the driving Unit 9 as in fig. 5 and 7 does not write the coherency DATA _ PWM in the scanning area SC1 of the scanning light-emitting interval PZ1 and performs the pulse width modulation light emission in the light-emitting area EM 1.
Referring to fig. 8, the same pins in fig. 8 as those in fig. 6 are labeled with the same reference numerals, and therefore, the details thereof are not further described herein. As shown in fig. 8, a first terminal of the second switch 62 of the slope signal selection circuit 6 receives the second DC voltage (DC _ H) and a control terminal thereof receives the enable signal G2 (PZi) of the driving units Unit1 to Unit 16, a second terminal of the third switch 63, a second terminal of the fourth switch 64 and a second terminal of the fifth switch 65 are configured to receive the first DC voltage (DC _ L), and a control terminal of the third switch 63 receives the emission signal EM [ PZ (i + 1) ] of the driving units Unit1 to Unit 16, where i =1 to 16.
Referring to fig. 9, when the luminance of the led display panel 1 is insufficient, the led display panel 1 must emit light again. However, the led display panel 1 of the present disclosure does not need to load the display data again, but the PWM (pulse width modulation), PAM (pulse amplitude modulation), and EM (light emitting signal) in fig. 8 adopt a shift register signal manner, and a PWM _ G boosting function is added to drop the loaded data voltage, so that the slope signal selection circuit 6 receives the enabling signal G2 of the driving units Unit1 to Unit 16 by using the control terminal of the second switch 62, the second switch 62 is turned on to input the second direct current voltage (DC _ H) to each row of the PWM pixel circuits 5, and each row of the PWM pixel circuits 5 inputs the second direct current voltage (DC _ H) again to perform the PWM light emission again, such as the driving Unit1 performs the PWM light emission again in the light emitting area EM 9 in the figure, and such as the driving Unit 9 performs the PWM light emission again in the light emitting area EM 1 in the figure.
Fig. 10 is a timing simulation verification diagram of fig. 6. When the control terminal of the first switch 61 in the slope signal selection circuit 6 receives the light-emitting signals EM [ PZi ] of the driving units Unit1 to Unit 16, respectively, the first switch 61 is enabled to input the multi-slope signal MSS to each row of the PWM pixel circuits 5 of each of the driving units Unit1 to Unit 16, so that the PWM current (PWM current) outputs a milliampere level, where i =1 to 16. The simulation verifies the feasibility of equally dividing the LED display panel into a plurality of driving units so as to provide the LED display panel with high resolution/high pixel density.
In summary, the present invention equally divides the led display panel into a plurality of driving units and uses the slope signal selection circuit, so that the risk of large driving current is reduced, the design complexity of the driving circuit is simplified, the number of scanning groups is reduced, the design complexity of the driving circuit is simplified, the pixel density (PPI) is increased, and the light-emitting brightness of the led display panel can be increased by performing pulse width modulation light emission for multiple times.
Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.
Claims (12)
1. A light emitting diode display panel comprising:
the driving units are equally divided along the scanning direction of the light-emitting diode display panel, and each driving unit comprises a plurality of rows of pulse width modulation pixel circuits;
at least one slope signal selection circuit for sequentially enabling each of the driving units, so that each row of PWM pixel circuits is sequentially selected to write in coherent data in a scanning light-emitting interval of each enabled driving unit, and a multi-slope signal is simultaneously input to enable each row of PWM pixel circuits to simultaneously perform PWM light-emitting;
wherein, each drive unit is enabled in sequence to form a scanning light-emitting interval of each drive unit;
in the scanning light-emitting interval of each drive unit, the pulse width modulation pixel circuits are firstly selected in sequence to write in a piece of consistency data, and then pulse width modulation light-emitting is carried out simultaneously;
wherein the slope signal selection circuit comprises: a first switch; a second switch; a third switch; a fourth switch; and a fifth switch; each switch has a first end, a second end and a control end for determining whether the first end and the second end are conducted, the first end of the first switch is used for receiving the multi-slope signal, the second end of the first switch, the second end of the second switch, the first end of the third switch, the first end of the fourth switch and the first end of the fifth switch are electrically connected to a first node, the first end of the second switch is used for receiving a first direct current voltage, and the second end of the third switch, the second end of the fourth switch and the second end of the fifth switch are used for receiving a second direct current voltage, wherein the first direct current voltage is different from the second direct current voltage.
2. The led display panel of claim 1, wherein when the rows of pwm pixel circuits are sequentially selected to write the coherence data, the first switch, the second switch, the third switch and the fifth switch of the slope signal selection circuit are turned off, and the control terminal of the fourth switch receives an enable signal for each row of pwm pixel circuits to turn on the fourth switch, so that the second terminal of the fourth switch receives the second dc voltage and inputs the second dc voltage to each row of pwm pixel circuits through the first node.
3. The led display panel of claim 1, wherein when the multiple rows of pwm pixel circuits are simultaneously inputted with the multiple slope signals, the second switch, the third switch, the fourth switch and the fifth switch of the slope signal selection circuit are turned off, and the control terminal of the first switch receives a light signal of each of the driving units to turn on the first switch, so that the first terminal of the first switch receives the multiple slope signals and inputs the multiple slope signals to the multiple rows of pwm pixel circuits through the first node.
4. A driving method of a light emitting diode display panel, the driving method comprising:
equally dividing the LED display panel along the scanning direction of the LED display panel to form a plurality of driving units, wherein each driving unit comprises a plurality of rows of pulse width modulation pixel circuits; and
sequentially enabling each driving unit to form a scanning light-emitting interval of each driving unit;
in the scanning light-emitting interval of each driving unit, the multiple rows of pulse width modulation pixel circuits are firstly selected in sequence to write in a consistency data, and then pulse width modulation light emission is carried out simultaneously;
the light emitting diode display panel also comprises at least one slope signal selection circuit, a plurality of driving units and a plurality of pulse width modulation pixel circuits, wherein the slope signal selection circuit is used for sequentially enabling each driving unit, so that in a scanning light-emitting interval of each enabled driving unit, each row of pulse width modulation pixel circuits are sequentially selected to write in the coherence data, and a plurality of slope signals are simultaneously input, so that each row of pulse width modulation pixel circuits simultaneously carry out pulse width modulation light-emitting;
wherein the slope signal selection circuit comprises: a first switch; a second switch; a third switch; a fourth switch; and a fifth switch; each switch has a first end, a second end and a control end for determining whether the first end and the second end are conducted, the first end of the first switch is used for receiving the multi-slope signal, the second end of the first switch, the second end of the second switch, the first end of the third switch, the first end of the fourth switch and the first end of the fifth switch are electrically connected to a first node, the first end of the second switch is used for receiving a first direct current voltage, and the second end of the third switch, the second end of the fourth switch and the second end of the fifth switch are used for receiving a second direct current voltage, wherein the first direct current voltage is different from the second direct current voltage.
5. The driving method as claimed in claim 4, wherein when the rows of PWM pixel circuits are sequentially selected to write the coherence data, the first switch, the second switch, the third switch and the fifth switch of the slope signal selection circuit are turned off, and the control terminal of the fourth switch receives an enable signal of each row of PWM pixel circuits to turn on the fourth switch, so that the second terminal of the fourth switch receives the second DC voltage and inputs the second DC voltage to each row of PWM pixel circuits through the first node.
6. The driving method as claimed in claim 4, wherein when the multi-slope signal is inputted to the plurality of rows of PWM pixel circuits simultaneously, the second switch, the third switch, the fourth switch and the fifth switch of the slope signal selection circuit are turned off, and the control terminal of the first switch receives a light signal of each of the plurality of driving units to turn on the first switch, so that the first terminal of the first switch receives the multi-slope signal and inputs the multi-slope signal to the plurality of rows of PWM pixel circuits through the first node.
7. A light emitting diode display panel comprising:
the driving units are equally divided along the scanning direction of the light-emitting diode display panel, and each driving unit comprises a plurality of rows of pulse width modulation pixel circuits; and
at least one slope signal selection circuit for sequentially enabling each of the driving units, so that each row of PWM pixel circuits is sequentially selected to write in coherent data in a scanning light-emitting interval of each enabled driving unit, and a multi-slope signal is simultaneously input to enable each row of PWM pixel circuits to simultaneously perform PWM light-emitting;
wherein, each drive unit is enabled in sequence to form a scanning light-emitting interval of each drive unit;
in the scanning light-emitting interval of each drive unit, the pulse width modulation pixel circuits are firstly selected in sequence to write in a piece of consistency data, and then pulse width modulation light-emitting is carried out simultaneously;
each pulse width modulation pixel circuit in the multiple rows of pulse width modulation pixel circuits comprises a light emitting diode and a driving circuit connected to drive the light emitting diode;
wherein the slope signal selection circuit comprises: a first switch; a second switch; a third switch; a fourth switch; and a fifth switch; each switch has a first end, a second end and a control end for determining whether the first end and the second end are conducted, the first end of the first switch is used for receiving the multi-slope signal, the second end of the first switch, the second end of the second switch, the first end of the third switch, the first end of the fourth switch and the first end of the fifth switch are electrically connected to a first node, the first end of the second switch is used for receiving a first direct current voltage, and the second end of the third switch, the second end of the fourth switch and the second end of the fifth switch are used for receiving a second direct current voltage, wherein the first direct current voltage is different from the second direct current voltage.
8. The led display panel of claim 7, wherein when the rows of pwm pixel circuits are sequentially selected to write the coherence data, the first switch, the second switch, the third switch and the fifth switch of the slope signal selection circuit are turned off, and the control terminal of the fourth switch receives an enable signal for each row of pwm pixel circuits to turn on the fourth switch, so that the second terminal of the fourth switch receives the second dc voltage and inputs the second dc voltage to each row of pwm pixel circuits through the first node.
9. The light emitting diode display panel according to claim 7, wherein when the multi-slope signal is simultaneously inputted to the plurality of rows of PWM pixel circuits, the second switch, the third switch, the fourth switch and the fifth switch of the slope signal selection circuit are turned off, and the control terminal of the first switch receives a light signal of each of the driving units to turn on the first switch, so that the first terminal of the first switch receives the multi-slope signal and inputs the multi-slope signal to the plurality of rows of PWM pixel circuits through the first node.
10. A driving method of a light emitting diode display panel, the driving method comprising:
equally dividing the LED display panel along the scanning direction of the LED display panel to form a plurality of driving units, wherein each driving unit comprises a plurality of rows of pulse width modulation pixel circuits; and
sequentially enabling each driving unit to form a scanning light-emitting interval of each driving unit;
in the scanning light-emitting interval of each drive unit, the pulse width modulation pixel circuits are firstly selected in sequence to write in a piece of consistency data, and then pulse width modulation light-emitting is carried out simultaneously;
each pulse width modulation pixel circuit in the multiple rows of pulse width modulation pixel circuits comprises a light emitting diode and a driving circuit connected to drive the light emitting diode;
the light emitting diode display panel also comprises at least one slope signal selection circuit, a plurality of driving units and a plurality of pulse width modulation pixel circuits, wherein the slope signal selection circuit is used for sequentially enabling each driving unit, so that in a scanning light-emitting interval of each enabled driving unit, each row of pulse width modulation pixel circuits are sequentially selected to write in the coherence data, and a plurality of slope signals are simultaneously input to enable each row of pulse width modulation pixel circuits to simultaneously carry out pulse width modulation light-emitting;
wherein the slope signal selection circuit comprises: a first switch; a second switch; a third switch; a fourth switch; and a fifth switch; each switch has a first end, a second end and a control end for determining whether the first end and the second end are conducted, the first end of the first switch is used for receiving the multi-slope signal, the second end of the first switch, the second end of the second switch, the first end of the third switch, the first end of the fourth switch and the first end of the fifth switch are electrically connected to a first node, the first end of the second switch is used for receiving a first direct current voltage, the second end of the third switch, the second end of the fourth switch and the second end of the fifth switch are used for receiving a second direct current voltage, wherein the first direct current voltage is different from the second direct current voltage.
11. The driving method as claimed in claim 10, wherein when the rows of pwm pixel circuits are sequentially selected to write the coherence data, the first switch, the second switch, the third switch and the fifth switch of the slope signal selection circuit are turned off, and the control terminal of the fourth switch receives an enable signal of each row of pwm pixel circuits to turn on the fourth switch, so that the second terminal of the fourth switch receives the second dc voltage and inputs the second dc voltage to each row of pwm pixel circuits through the first node.
12. The driving method as claimed in claim 10, wherein when the multiple rows of pwm pixel circuits are simultaneously inputted with the multiple slope signals, the second switch, the third switch, the fourth switch and the fifth switch of the slope signal selection circuit are turned off, and the control terminal of the first switch receives a light signal of each of the driving units to turn on the first switch, so that the first terminal of the first switch receives the multiple slope signals and inputs the multiple slope signals to the multiple rows of pwm pixel circuits through the first node.
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| TW110103033 | 2021-01-27 | ||
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| TW110125771 | 2021-07-14 | ||
| TW110125771A TWI791242B (en) | 2021-01-27 | 2021-07-14 | Led display panel and driving method thereof |
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| KR102439225B1 (en) * | 2015-08-31 | 2022-09-01 | 엘지디스플레이 주식회사 | Organic Light Emitting Display and, Device and Method of Driving the same |
| KR102583109B1 (en) * | 2019-02-20 | 2023-09-27 | 삼성전자주식회사 | Display panel and driving method of the display panel |
| CN111754933A (en) * | 2019-03-28 | 2020-10-09 | 云谷（固安）科技有限公司 | Pixel digital driving circuit, display device and driving method |
| CN110085164B (en) * | 2019-05-29 | 2020-11-10 | 深圳市华星光电半导体显示技术有限公司 | Display panel and display device |
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