CN110956922B - Display panel and driving method - Google Patents
Display panel and driving method Download PDFInfo
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- CN110956922B CN110956922B CN201911317521.9A CN201911317521A CN110956922B CN 110956922 B CN110956922 B CN 110956922B CN 201911317521 A CN201911317521 A CN 201911317521A CN 110956922 B CN110956922 B CN 110956922B
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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]
Abstract
An embodiment of the present invention provides a display panel, including: m gate lines arranged at intervals along a first direction; the n data lines are arranged at intervals along the second direction, and the m gate lines and the n data lines are insulated and crossed to define a plurality of sub-pixels; the light-emitting diodes are formed in one sub-pixel and are respectively and electrically connected with one data line and one gate line which define the sub-pixel where the light-emitting diodes are located; the protection circuits are electrically connected with the light emitting diodes in a one-to-one correspondence manner, and each protection circuit is used for performing overcurrent protection when the electrically connected light emitting diode is in a non-working state; and the driver is electrically connected with the m gate lines, the n data lines and the plurality of protection circuits and is used for outputting a control signal to the protection circuits according to the working state of the light emitting diodes so as to switch the electrical connection relation between the protection circuits and the light emitting diodes. The embodiment of the invention also provides a driving method.
Description
Technical Field
The present invention relates to the field of image display technologies, and in particular, to a display panel and a driving method applied to the display panel.
Background
In the prior art, a plurality of pixel regions arranged in an array manner are defined on a display panel of a micro light emitting diode display, each pixel region includes a plurality of sub-pixels, each sub-pixel is provided with a micro light emitting diode, a driver outputs a driving signal to each micro light emitting diode to control each micro light emitting diode to emit light or close, and the micro light emitting diode display displays different pictures through the light emitting cooperation of each micro light emitting diode.
The micro light-emitting diode has the characteristic of forward conduction and reverse cut-off, namely, if the anode voltage of the micro light-emitting diode is higher than the cathode voltage and the anode-cathode voltage difference is greater than the starting voltage of the micro light-emitting diode, the micro light-emitting diode is conducted at the moment, has a conduction current and has a direct ratio of the brightness of luminance to the conduction current; if the anode voltage of the micro light-emitting diode is lower than the cathode voltage, the micro light-emitting diode is cut off and does not emit light at the moment, and has a reverse bias current which is extremely small and close to zero.
Although the reverse bias current is very small, the number of the micro light emitting diodes on the display panel is large, the reverse bias current directions of the micro light emitting diodes are the same, and a large reverse bias current sum can be formed through accumulation, and the reverse bias current sum can influence the picture quality of the micro light emitting diode display and cause the picture contrast to be reduced. Further, when the voltage of the anode of the led is lower than the voltage of the cathode and the voltage difference between the anode and the cathode is greater than the breakdown voltage of the led, a large current is instantaneously generated to burn the led.
Disclosure of Invention
One aspect of the present invention provides a display panel including:
m gate lines arranged at intervals along a first direction, wherein m is greater than 2;
n data lines arranged at intervals along a second direction, wherein n is larger than 2, the m gate lines and the n data lines are arranged in an insulated and crossed mode, and the m gate lines and the n data lines are arranged in an insulated and crossed mode to define a plurality of sub pixels;
the light-emitting diodes are formed in one sub-pixel and are respectively and electrically connected with one data line and one gate line which define the sub-pixel where the light-emitting diodes are located;
the protection circuits are electrically connected with the light emitting diodes in a one-to-one correspondence manner, and each protection circuit is used for performing overcurrent protection when the electrically connected light emitting diode is in a non-working state;
and the driver is electrically connected with the m gate lines, the n data lines and the plurality of protection circuits, and is used for controlling the working state of each light emitting diode and outputting a control signal to the plurality of protection circuits according to the working state of each light emitting diode so as to switch the electrical connection relationship between the plurality of protection circuits and each light emitting diode.
Another aspect of the present invention provides a driving method applied to the display panel, including:
detecting the working state of each light-emitting diode;
and according to the working state of each light-emitting diode, outputting a control signal to switch the electrical connection relation between the plurality of protection circuits and each light-emitting diode so as to control the protection circuits electrically connected with the light-emitting diodes to carry out overcurrent protection when the light-emitting diodes are in a non-working state.
The display panel is electrically connected with a protection circuit corresponding to each light emitting diode, the light emitting diodes have reverse bias current in a non-working state according to the characteristics of the light emitting diodes, and each protection circuit is used for performing over-current protection when the electrically connected light emitting diodes are in the non-working state, so that the influence of the reverse bias current on display is favorably improved, and the over-current burning of the light emitting diodes can be effectively prevented.
Drawings
Fig. 1 is a schematic plan view of a display panel according to an embodiment of the present invention.
Fig. 2 is a V-I characteristic curve diagram of the led shown in fig. 1.
Fig. 3 is a circuit configuration diagram of one sub-pixel in fig. 1.
Fig. 4 is a waveform diagram of driving signals on the data lines and the gate lines in fig. 3.
Fig. 5 is a schematic plan view of a display panel according to a second embodiment of the present invention.
Fig. 6 is a circuit configuration diagram of one sub-pixel in fig. 5.
Fig. 7 is a schematic plan view of a display panel according to a third embodiment of the present invention.
Fig. 8 is a circuit configuration diagram in one sub-pixel in fig. 7.
Fig. 9 is a schematic plan view of a display panel according to a fourth embodiment of the present invention.
Fig. 10 is a circuit configuration diagram in one sub-pixel in fig. 9.
Fig. 11 is a schematic plan view of a display panel to which the driving method according to the fifth embodiment of the invention is applied.
Fig. 12 is a schematic plan view of a display panel to which a driving method according to a sixth embodiment of the present invention is applied.
Description of the main elements
Gate lines GL, GL 1-GLm
Data lines SL, SL1 to SLn
Steps S1, S2
First control terminal s
Second control terminal
Input terminal x
Output terminal f
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
Example one
Referring to fig. 1, a display panel 10 of the present embodiment includes a substrate 11, and m gate lines (GL 1-GLm, m > 2) and n data lines (SL 1-SLn, n > 2) formed on the substrate 11, where the gate lines are arranged in parallel and at intervals, the data lines are arranged in parallel, and the m gate lines and the n data lines are insulated from each other and crossed to define a plurality of sub-pixels 12 arranged in an array, as shown in fig. 1, an X direction is defined as a row direction of the array, and a Y direction is defined as a column direction of the array.
Referring to fig. 1, the display panel 10 further includes a plurality of light emitting diodes 13 disposed on the substrate 11, and each light emitting diode 13 is located in one of the sub-pixels 12. Each light emitting diode 13 has an anode and a cathode, the anode of each light emitting diode 13 is electrically connected to the gate line GL defining the sub-pixel 12 where it is located, and the cathode of each light emitting diode 13 is electrically connected to the data line SL defining the sub-pixel 12 where it is located. The light emitting diodes 13 in the same row of the array are electrically connected to the same gate line GL, and the light emitting diodes 13 in the same column of the array are electrically connected to the same data line SL.
In this embodiment, the Light emitting Diode 13 may be a Micro-Light emitting Diode (Micro-LED) with a size of less than 100 micrometers, but the size of the Light emitting Diode 13 is not limited thereto in other embodiments.
Referring to fig. 2, the abscissa represents voltage and the ordinate represents current. According to the characteristic of the LED of 'forward on and reverse off', the voltage of the anode of the LED 13 in the working state is higher than that of the cathode, and the voltage difference between the anode and the cathode is greater than the starting voltage V of the LED 13kThe luminance of the led 13 is proportional to the current in the led 13. The voltage of the cathode of the LED 13 in the non-working state is higher than that of the anode, and when the voltage difference between the anode and the cathode is less than the breakdown voltage V of the LED 13brWhen the light emitting diode 13 has a reverse bias current,the reverse bias current is very small and close to zero. But the voltage difference between the positive and negative electrodes is larger than the breakdown voltage V of the light emitting diode 13brIn the meantime, the reverse bias current of the led 13 increases rapidly, and after a certain period of time, the led 13 is directly burned out, so that the led is not usable, and the light source of the display panel 10 is damaged, thereby failing to display images.
Referring to fig. 1 again, the display panel 10 of the present embodiment further includes a plurality of protection circuits 14 located on the substrate 11, wherein the plurality of protection circuits 14 are electrically connected to the plurality of light emitting diodes 13 in a one-to-one correspondence manner, that is, each protection circuit 14 is electrically connected to one light emitting diode 13, and each protection circuit 14 is connected to a different light emitting diode 13. Each protection circuit 14 is used for performing over-current protection on the light emitting diode 13 when the light emitting diode 13 electrically connected with the protection circuit is in a non-working state.
Referring to fig. 1, the display panel 10 further includes a driver 15 disposed on the substrate 11, wherein the driver 15 is electrically connected to the m gate lines GL, the n data lines SL and the plurality of protection circuits 14, and is configured to control the operating state of each light emitting diode 13 (i.e., control the light emitting diode 13 to emit light or turn off), and output a control signal to each protection circuit 14 according to the operating state of each light emitting diode 13 to switch the electrical connection relationship between each protection circuit 14 and each light emitting diode 13.
That is, the electrical connection between each protection circuit 14 and the led 13 electrically connected thereto is changed, and the switching between the different electrical connections is controlled by the control signal output from the driver 15. Further, the driver 15 is configured to output a control signal to each protection circuit 14 to control each protection circuit 14 to turn on or off itself, so as to control each light emitting diode 13 electrically connected to each protection circuit 14 to be kept in a state of turning on, short-circuiting, or open-circuiting.
In this embodiment, the driver 15 is configured to output a control signal to each protection circuit 14 to control each protection circuit 14 to turn on or off, so as to control each light emitting diode 13 electrically connected to each protection circuit 14 to be kept in a state of turning on or off.
Referring to fig. 3, the protection circuit 14 of the present embodiment includes a first switchA unit 141, a first switch unit 141 having a first control terminal s and a second control terminal
A first control terminal s and a second control terminal
All electrically connected to the driver 15 for receiving the control signal outputted from the driver 15; the first switch unit 141 further has an input terminal x and an output terminal f, wherein the input terminal x is electrically connected to the data line SL1 electrically connected to the light emitting diode 13, and the output terminal f is electrically connected to the cathode of the light emitting diode 13.
Taking the led 13 in fig. 3 as an example, please refer to fig. 3 and fig. 4 together, when the led 13 is in the working state (on), the driver 15 outputs the control signal to the first control terminal s and the second control terminal s of the switch unit 141 respectively
When the switch unit 141 is kept on, a conductive loop is formed between the anode and the cathode of the light emitting diode 131, and the driver 15 controls the voltage (V) on the data line SL1 electrically connected with the light emitting diode 13SL1) Higher than the voltage (V) on the gate line GL1GL1) And the voltage difference is greater than the threshold voltage of the led 13 to control the led 13 to emit light.
When the light emitting diode 13 is in a non-operating state (off), the driver 15 outputs control signals to the first control terminal s and the second control terminal s of the switch unit 141 respectively
When the control switch unit 141 is kept open, that is, the output terminal of the control switch unit 141 is in a floating state, a conducting loop cannot be formed between the positive and negative electrodes of the led 131, and at this time, the voltage on the data line SL1 electrically connected to the led 13 is lower than the voltage on the gate line GL1, and even if a voltage difference exists between the positive and negative electrodes of the led 13, a reverse bias current cannot be formed due to the fact that a conducting loop cannot be formed, so that the problem that the light emitting diode in a non-working state emits light can be effectively solvedThe reverse bias current generated by the diode 13 affects the display image of the display panel 10, and the light emitting diode 13 is burned when the reverse bias current is too large.
The present embodiment further provides a driving method applied to the display panel, including the following steps:
step S11, detecting the working state of each LED;
and step S12, outputting control signals to switch the electrical connection relation between the protection circuits and the LEDs according to the working state of each LED, so as to control the protection circuits electrically connected with the LEDs to perform overcurrent protection when the LEDs are in a non-working state.
In step S11, the driving method provided in this embodiment detects the operating state of each light emitting diode 13 by detecting the control signals on the data line SL and the gate line GL electrically connected to each light emitting diode 13. Taking the light emitting diode 13 in fig. 3 as an example, the operating state of the light emitting diode 13 is detected by detecting the driving signals on the data line SL1 and the gate line GL1 to which the light emitting diode 13 is electrically connected.
The output timing of the driving signal for controlling each of the light emitting diodes 13 to emit light in the display period of the display panel 10 is determined based on the image data. In the circuit shown in fig. 3, when it is detected that the level of the driving signal on the gate line GL1 is lower than the level of the driving signal on the data line SL1 and the level difference is greater than a threshold (determined by the structural characteristics of the light emitting diode 13 itself), it is determined that the light emitting diode 13 is in an operating (light emitting) state at this time, and when it is detected that the level of the driving signal on the gate line GL1 is higher than the level of the driving signal on the data line SL1, it is determined that the light emitting diode 13 is in a non-operating (off) state at this time.
In step S12, when detecting that the light emitting diode 13 is in the operating state, the driver 15 controls the first switch unit 141 to be turned on, so that a conductive loop is formed between the positive electrode and the negative electrode of the light emitting diode 131; when the light emitting diode 13 is in a non-operating state, the driver 15 controls the first switch unit 141 to keep an open circuit, so as to control that a conduction loop cannot be formed between the anode and the cathode of the light emitting diode 13, and a reverse bias current cannot be formed, thereby effectively preventing the light emitting diode 13 from being burnt out by overcurrent, and thus realizing overcurrent protection of the light emitting diode 13.
In the display panel 10 provided in this embodiment, a protection circuit 14 is electrically connected to each light emitting diode 13, according to characteristics of the light emitting diodes 13, the light emitting diodes 13 have a reverse bias current in a non-operating state, and each protection circuit 14 is used for performing an over-current protection when the electrically connected light emitting diodes 13 are in the non-operating state, which is beneficial to improving an influence of the reverse bias current on display on one hand and effectively preventing the light emitting diodes 13 from being burned out by an over-current on the other hand.
Example two
Referring to fig. 5, the difference between the display panel 20 provided in the present embodiment and the first embodiment is mainly that the circuit structure of the protection circuit 24 in the present embodiment is different from that of the protection circuit 14 in the first embodiment.
In the present embodiment, each protection circuit 24 includes a first switching unit 241 and a second switching unit 242. The first switch unit 241 is electrically connected to the anode of the light emitting diode 23 and the gate line GL to which the light emitting diode 23 is electrically connected; the second switch units 242 are electrically connected to the anodes of the light emitting diodes 23 and the data lines SL to which the light emitting diodes 23 are electrically connected, respectively.
Referring to fig. 5, in the present embodiment, the driver 25 is configured to output a control signal to each protection circuit 24 to control each protection circuit 24 to turn on or off itself, so as to control each light emitting diode 23 electrically connected to each protection circuit 24 to be kept in a conducting or short-circuit state.
Referring to fig. 6, in the present embodiment, the first switch unit 241 and the second switch unit 242 in each protection circuit 24 have the same circuit structure, but different connection modes. Taking the circuit structure shown in fig. 6 as an example, the first switch unit 241 has a first control terminal s and a second control terminal
A first control terminal s and a second control terminal
All electrically connected to the driver 15 for receiving the control signal outputted from the driver 15; the first switch unit 241 further has an input terminal x electrically connected to the cathode of the light emitting diode 23 and an output terminal f electrically connected to the gate line GL1 to which the light emitting diode 23 is electrically connected. First control terminal s and second control terminal of second switch unit 242
All electrically connected to the driver 15 for receiving the control signal outputted from the driver 15; the input terminal x of the second switch unit 242 is electrically connected to the cathode of the light emitting diode 23 and a node between the cathode of the light emitting diode 23 and the input terminal x of the first light emitting unit 241, and the output terminal f is electrically connected to the data line SL1 electrically connected to the light emitting diode 23.
Referring to fig. 6, when the light emitting diode 23 is in the working state, the driver 25 outputs control signals to the first control terminal s and the second control terminal s of the first switch unit 241 respectively
Controls the first switch unit 241 to be turned on and outputs control signals to the first control terminal s and the second control terminal s of the second switch unit 242
When the second switch unit 242 is controlled to remain open, a conductive loop is formed between the anode and the cathode of the light emitting diode 23, and the driver 25 controls the light emitting diode 23 to emit light by controlling the voltages on the data line SL1 and the gate line GL1, which are electrically connected to the light emitting diode 23.
When the light emitting diode 23 is in the non-operating state, the driver 25 outputs control signals to the first control terminal s and the second control terminal of the first switching unit 241 respectively
Controls the first switch unit 241 to keep open circuit and outputs control signals to the first control terminal s and the second control terminal of the second switch unit 242
The second switch unit 242 is controlled to be turned on, at this time, the light emitting diode 23 is short-circuited, the voltages between the anode and the cathode of the light emitting diode 23 are almost equal, the voltage difference between the anode and the cathode is extremely small, and the reverse bias current generated at this time is almost zero.
Therefore, the display panel 20 provided by this embodiment can effectively reduce the influence of the reverse bias current generated by the light emitting diode 23 in the non-operating state on the display image of the display panel 20, and on the other hand, can effectively prevent the light emitting diode 23 from being burned out by overcurrent by controlling the reverse bias current of the light emitting diode 23 in the non-operating state to be almost zero.
EXAMPLE III
Referring to fig. 7, the display panel 30 of the present embodiment is different from the second embodiment mainly in that the protection circuit 34 of the present embodiment is different from the protection circuit 24 of the second embodiment in circuit structure.
In this embodiment, each protection circuit 34 includes a first switch unit 341 and a resistor element 342. The first switch unit 341 has substantially the same circuit structure and connection manner as the first switch unit 241 in the second embodiment, and is not described again. The resistor 342 is electrically connected to the anode of the led 33 and the data line SL to which the led 33 is electrically connected.
Referring to fig. 7, in the present embodiment, the driver 35 is configured to output a control signal to each protection circuit 34 to control each protection circuit 34 to turn on or off itself, so as to control each light emitting diode 33 electrically connected to each protection circuit 34 to be kept in a conducting or short-circuit state.
Referring to fig. 8, when the light emitting diode 33 is in the working state, the driver 35 outputs control signals to the first control terminal s and the second control terminal s of the first switch unit 341 respectively
When the first switch unit 341 is controlled to be turned on, a conducting loop is formed between the anode and the cathode of the led 33, and the driver 35 controls the led33 to control the light emission of the light emitting diode 33, and the voltages on the data line SL1 and the gate line GL1 electrically connected to each other. When the led 33 is in the non-operating state, the driver 35 outputs control signals to the first control terminal s and the second control terminal s of the first switch unit 341 respectively
The first switch unit 341 is controlled to remain open, at this time, the light emitting diode 33 is short-circuited, the voltages between the positive and negative electrodes are almost equal, the voltage difference between the positive and negative electrodes is extremely small, and the reverse bias current generated at this time is almost zero.
Therefore, the display panel 30 provided by this embodiment can effectively reduce the influence of the reverse bias current generated by the light emitting diode 33 in the non-operating state on the display image of the display panel 30, and on the other hand, can effectively prevent the light emitting diode 33 from being burnt out by overcurrent by controlling the reverse bias current of the light emitting diode 33 in the non-operating state to be almost zero.
Example four
Referring to fig. 9, the display panel 30 of the present embodiment is different from the third embodiment mainly in that the protection circuit 44 of the present embodiment is different from the protection circuit 34 of the third embodiment in circuit structure.
In this embodiment, each protection circuit 44 includes a first switch unit 441, and a resistor structure 431 is disposed in each light emitting diode 43. The first switch unit 441 has substantially the same circuit structure and connection manner as the first switch unit 341 in the third embodiment, and is not described again. The main difference from the third embodiment is that, in the present embodiment, the resistor structure 431 is integrated with the led 43, the resistor structure 431 is formed together in the process of manufacturing the led 43, and belongs to the internal structure of the led 43, and two ends of the resistor structure 431 are connected in parallel between two electrodes of the led 43, so that the resistor structure 431 is transferred together when the led 43 is transferred onto the substrate 41; referring to fig. 7, the resistor 342 in the third embodiment is independent of the structure of the light emitting diode 33, so that the resistor 342 in the third embodiment can be already disposed on the main board (not shown) of the display panel 30 before the light emitting diode 33 is transferred to the substrate 31.
Referring to fig. 9, in the present embodiment, the driver 45 is configured to output a control signal to each protection circuit 44 to control each protection circuit 44 to turn on or off, so as to control each light emitting diode 43 electrically connected to each protection circuit 44 to be kept in a turned-on or turned-off state.
Referring to fig. 10, when the light emitting diode 43 is in a working state, the driver 45 outputs control signals to the first control terminal s and the second control terminal s of the first switch unit 441 respectively
When the first switch unit 441 is controlled to be turned on, a conducting loop is formed between the positive electrode and the negative electrode of the light emitting diode 43, and the driver 45 controls the light emitting diode 33 to emit light by controlling the voltages on the data line SL1 and the gate line GL1, which are electrically connected to the light emitting diode 43. When the led 43 is in the non-operating state, the driver 45 outputs control signals to the first control terminal s and the second control terminal s of the first switch unit 441 respectively
The first switch unit 441 is controlled to remain open, and at this time, the light emitting diode 33 remains open, and the voltages between the positive and negative electrodes are almost equal, so that a reverse bias current cannot be formed.
Therefore, the display panel 40 provided by this embodiment can effectively reduce the influence of the reverse bias current generated by the light emitting diode 43 in the non-operating state on the display image of the display panel 40, and on the other hand, can effectively prevent the light emitting diode 43 from being burned out by overcurrent by controlling the reverse bias current of the light emitting diode 43 in the non-operating state to be almost zero.
Further, as in the display panel 10 of the first embodiment, the display panel 20 of the second embodiment, the display panel 30 of the third embodiment, and the display panel 40 of the fourth embodiment, the electrical connection methods between the light emitting diodes 13(23, 33, 43) and the gate lines GL and the data lines SL can be changed.
Specifically, the light emitting diodes 13(23, 33, and 43) in the first to fourth embodiments are all electrically connected to a data line SL in a positive polarity, and electrically connected to a gate line GL in a negative polarity; in an alternative embodiment of the present invention, the light emitting diodes 13(23, 33 and 43) may be electrically connected to a gate line GL for positive polarity and a data line SL for negative polarity.
When the light emitting diodes 13(23, 33, and 43) are electrically connected to the gate line GL at the positive electrode and the data line SL at the negative electrode, the signal output modes on the gate line GL and the data line SL are exactly opposite to the signal output modes described in the first to fourth embodiments. That is, for each light emitting diode 13(23, 33 and 43), when the voltage on the gate line GL electrically connected to the light emitting diode 13 is greater than the voltage on the data line SL electrically connected to the light emitting diode 13, and the voltage difference between the gate line GL and the data line SL is greater than the threshold voltage of the light emitting diode 13(23, 33 and 43), the light emitting diode 13(23, 33 and 43) is in the working state; when the voltage on the gate line GL electrically connected thereto is greater than the voltage on the data line SL electrically connected thereto, but the voltage difference between the gate line GL and the data line SL is less than the threshold voltage of the light emitting diode 13(23, 33, and 43), or the voltage on the gate line GL electrically connected thereto is less than the voltage on the data line SL electrically connected thereto, the light emitting diode 13(23, 33, and 43) is in the off state.
The display panel described above is also protected by the present invention.
EXAMPLE five
The driving method provided by the embodiment comprises the following steps:
step S21, detecting the working state of each LED;
step S22, according to the working status of each led, outputting a control signal to each gate line to control the gate lines to be connected or floating with the driver.
In the present embodiment, the above-mentioned driving method is applied to the display panel 50 shown in fig. 11, and the display panel 50 is mainly different from the display panel 10 in that the display panel 50 in fig. 11 does not include the protection circuit 14.
As the driving method described above, in step S21, the detection of the operating state of the light emitting diode 53 is implemented by the method described in the first embodiment, and is not described in detail. If the led is detected to be in the operating state in step S21, the driver 55 outputs a control signal to the gate line GL of the led 53 in step S22, and the control gate line GL continuously outputs a corresponding driving voltage to the led 53 to make the led 53 emit light. If the led is detected to be in the off state in step S21, the driver 55 outputs a control signal to the gate line GL to which the led 53 is electrically connected in step S22, the control gate line GL is in a floating state, and no driving signal is output to the led 53, and the led 53 does not emit light.
In the driving method provided in this embodiment, when the light emitting diode 53 is detected to be in the non-operating state, the gate line GL electrically connected to the light emitting diode 53 is controlled to be in the floating state, so that the voltage difference between the anode and the cathode of the light emitting diode is extremely small, and the reverse bias current in the light emitting diode 53 can be controlled to be almost zero, so that on one hand, the influence of the reverse bias current generated by the light emitting diode 53 in the non-operating state on the image displayed on the display panel 50 can be effectively reduced, and on the other hand, the reverse bias current of the light emitting diode 53 in the non-operating state is controlled to be almost zero, so that the light emitting diode 53 can be effectively prevented from being burned out by overcurrent.
Further, compared with the first to fourth embodiments, the driving method provided in this embodiment does not need a protection circuit in the display panel, and only uses the driver 55 to output the control signal to each gate line GL, which is beneficial to simplifying the structure of the display panel and saving the manufacturing cost of the display panel.
EXAMPLE six
The driving method provided by the present embodiment includes the method steps as described in the fifth embodiment, and is applied to the display panel 60 shown in fig. 12, where the main difference between the display panel 60 and the display panel 50 is that the connection manner of the light emitting diodes 63 is different.
Referring to fig. 12, in the present embodiment, the anode of each light emitting diode 63 is electrically connected to a gate line GL, and the cathode is electrically connected to a data line SL. Then, for each light emitting diode 63, when the voltage on the gate line GL electrically connected to the light emitting diode 63 is greater than the voltage on the data line SL electrically connected to the light emitting diode 63, and the voltage difference between the gate line GL and the data line SL is greater than the threshold voltage of the light emitting diode 63, in step S21, when the signal on the gate line GL is detected to be at the high level, the light emitting diode 63 is determined to be in the working state, and when the signal on the gate line GK is detected to be at the low level, the light emitting diode 63 is determined to be in the non-working state.
As described in the fifth embodiment, in the driving method provided in this embodiment, when the light emitting diode 63 is detected to be in the non-operating state, the gate line GL electrically connected to the light emitting diode 63 is controlled to be in the floating state, so that the voltage difference between the anode and the cathode of the light emitting diode 63 is extremely small, and the reverse bias current in the light emitting diode 63 can be controlled to be almost zero, on one hand, the influence of the reverse bias current generated by the light emitting diode 63 in the non-operating state on the image displayed on the display panel 60 can be effectively reduced, and on the other hand, the reverse bias current by controlling the light emitting diode 63 in the non-operating state is almost zero, so that the light emitting diode 63 can be effectively prevented from being burned out by overcurrent.
Further, compared with the first to fourth embodiments, the driving method provided in this embodiment does not need a protection circuit in the display panel, and only uses the driver 65 to output the control signal to each gate line GL, which is beneficial to simplifying the structure of the display panel and saving the manufacturing cost of the display panel.
It will be appreciated by those skilled in the art that the above embodiments are illustrative only and not intended to be limiting, and that suitable modifications and variations may be made to the above embodiments without departing from the true spirit and scope of the invention.
Claims (6)
1. A display panel, comprising:
m gate lines arranged at intervals along a first direction, wherein m is greater than 2;
n data lines arranged at intervals along a second direction, wherein n is larger than 2, the m gate lines and the n data lines are arranged in an insulated and crossed mode, and the m gate lines and the n data lines are arranged in an insulated and crossed mode to define a plurality of sub pixels;
the light-emitting diodes are formed in one sub-pixel and are respectively and electrically connected with one data line and one gate line which define the sub-pixel where the light-emitting diodes are located;
the protection circuits are electrically connected with the light-emitting diodes in a one-to-one correspondence manner, and each protection circuit is used for performing overcurrent protection when the electrically connected light-emitting diode is in a non-working state;
the driver is electrically connected with the m gate lines, the n data lines and the plurality of protection circuits, and is used for controlling the working state of each light emitting diode and outputting a control signal to the plurality of protection circuits according to the working state of each light emitting diode so as to switch the electrical connection relationship between the plurality of protection circuits and each light emitting diode;
the driver outputs control signals to each protection circuit to control the conduction or open circuit of each protection circuit so as to control the conduction, short circuit or open circuit of each light emitting diode electrically connected with each protection circuit;
each protection circuit comprises a first switch unit;
the driver is used for controlling the first switch unit to be conducted when the light emitting diode electrically connected with the protection circuit is in a working state, and controlling the first switch unit to be opened when the light emitting diode electrically connected with the protection circuit is in a non-working state;
each first switch unit is respectively and electrically connected with the anode of a light-emitting diode and a gate line electrically connected with the light-emitting diode;
each protection circuit further comprises a second switch unit;
the second switch unit is respectively and electrically connected with the anode of the light-emitting diode electrically connected with the first switch unit and the data line electrically connected with the light-emitting diode;
when the light emitting diode is in a working state, the driver controls the first switch unit to be conducted and controls the second switch unit to be opened, and when the light emitting diode is in a non-working state, the driver controls the first switch unit to be opened and controls the second switch unit to be conducted.
2. The display panel of claim 1, wherein each switch unit is electrically connected to a cathode of a light emitting diode and a data line to which the light emitting diode is electrically connected.
3. The display panel according to claim 1, wherein the protection circuit further includes resistance elements electrically connected to cathodes of the light emitting diodes to which the protection circuit is electrically connected and to data lines to which the light emitting diodes are electrically connected, respectively.
4. The display panel of claim 1, wherein each of the light emitting diodes has a resistor structure embedded therein, and two ends of the resistor structure are electrically connected to the anode and the cathode of the light emitting diode, respectively.
5. A driving method applied to the display panel according to any one of claims 1 to 4, the driving method comprising:
detecting the working state of each light-emitting diode;
and according to the working state of each light-emitting diode, outputting a control signal to switch the electrical connection relation between the plurality of protection circuits and each light-emitting diode so as to control the protection circuits electrically connected with the light-emitting diodes to carry out overcurrent protection when the light-emitting diodes are in a non-working state.
6. A driving method, applied to the display panel according to any one of claims 1 to 4, comprising the steps of:
detecting the working state of each light-emitting diode;
and outputting a control signal to each gate line according to the working state of each light-emitting diode, and controlling the gate lines to be conducted or floated with the driver.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911317521.9A CN110956922B (en) | 2019-12-19 | 2019-12-19 | Display panel and driving method |
| TW108147938A TWI737100B (en) | 2019-12-19 | 2019-12-26 | Display panel and driving method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911317521.9A CN110956922B (en) | 2019-12-19 | 2019-12-19 | Display panel and driving method |
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| CN110956922A CN110956922A (en) | 2020-04-03 |
| CN110956922B true CN110956922B (en) | 2022-05-13 |
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| CN201911317521.9A Active CN110956922B (en) | 2019-12-19 | 2019-12-19 | Display panel and driving method |
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| TW (1) | TWI737100B (en) |
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| CN111798802B (en) * | 2020-07-07 | 2021-10-08 | Tcl华星光电技术有限公司 | Mini LED backlight module and display device |
| CN112992022A (en) * | 2020-09-24 | 2021-06-18 | 重庆康佳光电技术研究院有限公司 | Display panel and detection method |
| CN112599077B (en) * | 2020-12-15 | 2023-12-22 | 錼创显示科技股份有限公司 | Micro light emitting diode display device and sub-pixel circuit thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1289111A (en) * | 2000-10-11 | 2001-03-28 | 上海大学 | Drive circuit for passive light emitting device |
| CN1249446C (en) * | 2001-05-15 | 2006-04-05 | 皇家菲利浦电子有限公司 | Display device comprising plurality of LEDS |
| JP2004302070A (en) * | 2003-03-31 | 2004-10-28 | Tohoku Pioneer Corp | Driving-gear for light emitting display panel |
| TWI648719B (en) * | 2004-09-16 | 2019-01-21 | 日商半導體能源研究所股份有限公司 | Display device and electronic device with pixels |
| CN101069226B (en) * | 2004-12-27 | 2010-09-29 | 京瓷株式会社 | Image display and its driving method |
| TWI543139B (en) * | 2015-02-13 | 2016-07-21 | 明陽半導體股份有限公司 | Driving device for display panel |
| US10217402B1 (en) * | 2015-09-25 | 2019-02-26 | Apple Inc. | Driving circuitry for micro light emitting diode electronic displays |
| CN205354617U (en) * | 2015-12-11 | 2016-06-29 | 深圳市绿源半导体技术有限公司 | LED display screen drive and control circuit |
| CN113241039A (en) * | 2016-06-28 | 2021-08-10 | 群创光电股份有限公司 | Display panel |
| CN108320698A (en) * | 2018-03-21 | 2018-07-24 | 佛山市青松科技股份有限公司 | A kind of LED drivings display circuit |
| CN209249052U (en) * | 2018-12-27 | 2019-08-13 | 深圳市嘉兴南电科技有限公司 | A kind of low back-pressure circuit of LED display, device and LED display |
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2019
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| Publication number | Publication date |
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| TWI737100B (en) | 2021-08-21 |
| CN110956922A (en) | 2020-04-03 |
| TW202125477A (en) | 2021-07-01 |
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