TW202125477A - Display panel and driving method - Google Patents

Abstract

The present disclosure provides a display panel including: m gate lines; n data lines; m gate lines and n data lines are insulated to define a plurality of sub-pixels; a plurality of light emitting diodes, each light emitting diode located in a sub-pixel; a plurality of protection circuits, the plurality of protection circuits and the plurality of light-emitting diodes are electrically connected in a one-to-one manner, each protection circuit is configured to provide over-current protection for light-emitting diode in a non-working state; a driver electrically connected to the m gate lines, the n data lines and the plurality of protection circuits. The driver is configured to output a control signal to the plurality of protection circuits according to the working state of the plurality of light emitting diodes to switch the electrical connection relationship between the plurality of protection circuits and the plurality of light emitting diodes. An embodiment of the present invention also provides a driving method. The present disclosure provides a driving method.

Description

Display panel and driving method

The present invention relates to the field of image display technology, in particular to a display panel and a driving method applied to the display panel.

In the prior art, a micro light-emitting diode display defines a plurality of pixel regions arranged in an array on the display panel, each pixel region includes a plurality of sub-pixels, and each sub-pixel is provided with a micro light-emitting diode By the driver outputting the driving signal to each micro-light-emitting diode, each micro-light-emitting diode can be controlled to emit light or turn off, and the light-emitting cooperation of each micro-light-emitting diode can realize different display of the micro-light-emitting diode. Picture.

Among them, the micro light emitting diode has the characteristic of "forward conduction and reverse cutoff", that is, if the positive electrode voltage of the micro light emitting diode is higher than the negative electrode voltage and the voltage difference between the positive and negative electrodes is greater than the opening of the micro light emitting diode Voltage, the miniature light-emitting diode is turned on at this time, has a conduction current, and the luminous brightness is proportional to the conduction current; if the anode voltage of the miniature light-emitting diode is lower than the negative electrode voltage, then the miniature light-emitting diode is now The body is off and does not emit light, and has a reverse bias current, which is very small and close to zero.

Although the reverse bias current is extremely small, the number of micro light-emitting diodes on the display panel is large, and the reverse bias current direction of each micro light-emitting diode is the same. After accumulation, a larger sum of reverse bias currents can be formed , The sum of the reverse bias current will affect the picture quality of the miniature light-emitting diode display and cause the picture contrast to decrease. Further, when the positive electrode voltage of the light emitting diode is lower than the negative electrode voltage and the voltage difference between the positive and negative electrodes is greater than the breakdown voltage of the light emitting diode, a relatively large current will be generated instantaneously, causing the light emitting diode to burn out.

One aspect of the present invention provides a display panel, including: m gate lines are arranged at intervals along the first direction, where m>2; n data lines are arranged at intervals along the second direction, where n>2, the m gate lines and the n data lines are insulated and intersected, and the m gate lines and the n data lines Insulation cross defines plural sub-pixels; A plurality of light-emitting diodes, each light-emitting diode is formed in a sub-pixel, and each light-emitting diode is respectively electrically connected to a data line and a gate line that define the sub-pixel where the light-emitting diode is located ； A plurality of protection circuits, the plurality of protection circuits are electrically connected to the plurality of light-emitting diodes in a one-to-one correspondence, and each protection circuit is used for over-current protection when the electrically connected light-emitting diodes are in a non-working state; A driver, which is electrically connected to the m gate lines, the n data lines, and the plurality of protection circuits, and is used to control the working state of each light-emitting diode, and according to the working state of each light-emitting diode Outputting a control signal to the plurality of protection circuits 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 above-mentioned display panel. The driving method includes the following steps: Detect the working status of each light-emitting diode; According to the working state of each light-emitting diode, output a control signal to switch the electrical connection relationship between the plurality of protection circuits and each light-emitting diode, so as to control the light-emitting diode when the light-emitting diode is in a non-working state. The protection circuit electrically connected to the diode performs overcurrent protection.

In the above-mentioned display panel, each light-emitting diode is electrically connected to a protection circuit. According to the characteristics of the light-emitting diode, the light-emitting diode has a reverse bias current when it is not in operation. Each protection circuit is used to electrically connect The over-current protection of the light-emitting diode when the light-emitting diode is in a non-working state, on the one hand, is beneficial to improve the influence of the reverse bias current on the display, and on the other hand, it can also effectively prevent the light-emitting diode from over-current burning.

Example one

Please refer to FIG. 1, the display panel 10 provided by this embodiment includes a substrate 11, m gate lines (GL1 to GLm, m>2) formed on the substrate 11, and n data lines (SL1 to SLn, n> 2) The gate lines are arranged parallel to each other at intervals, and the data lines are arranged parallel to each other. The m gate lines and n data lines are insulated and cross each other to define a plurality of sub-pixels 12 arranged in an array, as shown in Figure 1. As shown in, the X direction is defined as the row direction of the array, and the Y direction is defined as the column direction of the array.

Please continue to refer 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 a sub-pixel 12. Each light-emitting diode 13 has a positive electrode and a negative electrode. The positive electrode of each light-emitting diode 13 is electrically connected to the gate line GL that defines the sub-pixel 12 where it is located, and the negative electrode is connected to the sub-picture where it is defined. The data line SL of the element 12 is electrically connected. Each light emitting diode 13 located in the same row of the array is electrically connected to the same gate line GL, and each light emitting diode 13 located in the same column of the array is electrically connected to the same data line SL.

In this embodiment, the light emitting diode 13 may be a micro-light emitting diode (Micro-Light Emit Diode, Micro-LED) with a size below 100 microns, but in other embodiments the size of the light emitting diode 13 is not here. limit.

Refer to Figure 2. The abscissa represents voltage and the ordinate represents current. According to the characteristics of the "forward conduction and reverse cutoff" of the light-emitting diode, the positive voltage of the light-emitting diode 13 in the working state is higher than the negative voltage, and the voltage difference between the positive and negative electrodes is greater than the starting voltage of the light-emitting diode 13 V _k , the luminous brightness of the light-emitting diode 13 is proportional to the current in the light-emitting diode 13. The negative electrode voltage of the non-working light-emitting diode 13 is higher than the positive electrode voltage. When the voltage difference between the positive and negative electrodes is less than the breakdown voltage _Vbr of the light-emitting diode 13, the light-emitting diode 13 has a reverse bias current, The reverse bias current is extremely small, close to zero. However, when the voltage difference between the positive and negative electrodes is greater than the breakdown voltage _Vbr of the light-emitting diode 13, the reverse bias current of the light-emitting diode 13 increases sharply. The polar body is unavailable, and the light source of the display panel 10 is damaged and cannot display images.

Therefore, please refer to FIG. 1 again. The display panel 10 provided by this embodiment further includes a plurality of protection circuits 14 on the substrate 11. The plurality of protection circuits 14 and the plurality of light emitting diodes 13 are electrically connected in a one-to-one correspondence, that is, each protection circuit 14 is electrically connected to a light emitting diode 13, and each protection circuit 14 is connected to different light emitting diodes 13. Each protection circuit 14 is used to protect the light-emitting diode 13 from overcurrent when the light-emitting diode 13 electrically connected to it is in a non-working state.

Please continue to refer to FIG. 1, the display panel 10 also includes a driver 15 on the substrate 11. The driver 15 is electrically connected to m gate lines GL, n data lines SL and a plurality of protection circuits 14 for controlling each light emitting diode 13 The working state of each light-emitting diode 13 (that is, 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 working state of each light-emitting diode 13 to switch between each protection circuit 14 and each light-emitting diode 13 The electrical connection between.

That is, the electrical connection mode between each protection circuit 14 and the light-emitting diode 13 electrically connected to it is changed, and the switching between different electrical connection modes is controlled by the control signal output by the driver 15. Further, the driver 15 is used to output a control signal to each protection circuit 14 to control each protection circuit 14 itself to be turned on or open, so as to control the light emitting diodes 13 electrically connected to each protection circuit 14 to be kept in a state of conduction, short circuit or open circuit. .

In this embodiment, the driver 15 is used to output a control signal to each protection circuit 14 to control each protection circuit 14 to be turned on or open, so as to control the light emitting diodes 13 electrically connected to each protection circuit 14 to be kept in a conductive or open state. .

，第一控制端s及第二控制端

皆電連接驅動器15，用於接收驅動器15輸出的控制信號；第一開關單元141還具有一輸入端x及輸出端f，輸入端x電連接發光二極體13所電連接的資料線SL1，輸出端f電連接發光二極體13的負極。3, the protection circuit 14 in this embodiment includes a first switch unit 141, the first switch unit 141 has a first control terminal s and a second control terminal

, The first control terminal s and the second control terminal

All are electrically connected to the driver 15 for receiving the control signal output by the driver 15; the first switch unit 141 also has an input terminal x and an output terminal f. 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 negative electrode of the light emitting diode 13.

，控制開關單元141保持導通，則發光二極體131正負極之間形成導通回路，驅動器15藉由控制發光二極體13所電連接的資料線SL1上的電壓（V_SL1 ）高於閘極線GL1上的電壓（V_GL1 ）且電壓差值大於發光二極體13的閾值電壓，以控制發光二極體13發光。Take the light-emitting diode 13 in FIG. 3 as an example, please refer to FIGS. 3 and 4 together. When the light-emitting diode 13 is in the working state (on), the driver 15 respectively outputs control signals to the first control terminal of the switch unit 141 s and the second control terminal

, The switch unit 141 is controlled to maintain conduction, then a conduction loop is formed between the positive and negative electrodes of the light-emitting diode 131, and the driver 15 controls the voltage (V _SL1 ) on the data line SL1 electrically connected to the light-emitting diode 13 to be higher than the gate electrode. The voltage on the line GL1 (V _GL1 ) and the voltage difference is greater than the threshold voltage of the light-emitting diode 13 to control the light-emitting diode 13 to emit light.

，控制開關單元141保持開路，也即控制開關單元141的輸出端處於浮接狀態，則發光二極體131正負極之間不能形成導通回路，此時發光二極體13所電連接的資料線SL1上的電壓低於閘極線GL1上的電壓，即使此時發光二極體13正負極之間存在電壓差，由於不能形成導通的回路，便不能形成反偏電流，由此可有效解決處於非工作狀態的發光二極體13產生的反偏電流影響顯示面板10顯示圖像、及反偏電流太大時燒毀發光二極體13的問題。When the light emitting diode 13 is in a non-working state (off), the driver 15 respectively outputs control signals to the first control terminal s and the second control terminal of the switch unit 141

, The control switch unit 141 is kept open, that is, the output terminal of the control switch unit 141 is in a floating state, then a conduction loop cannot be formed between the positive and negative electrodes of the light-emitting diode 131. At this time, the data line electrically connected to the light-emitting diode 13 The voltage on SL1 is lower than the voltage on the gate line GL1. Even if there is a voltage difference between the positive and negative electrodes of the light-emitting diode 13 at this time, the reverse bias current cannot be formed due to the failure to form a conductive loop, which can effectively solve the problem of The reverse bias current generated by the light-emitting diode 13 in the non-working state affects the display image of the display panel 10 and the problem of burning the light-emitting diode 13 when the reverse bias current is too large.

This embodiment also provides a driving method, which is applied to the above-mentioned display panel, and the driving method includes the following steps: Step S11, detecting the working state of each light-emitting diode; Step S12, according to the working state of each light-emitting diode, output a control signal to switch the electrical connection relationship between the plurality of protection circuits and each light-emitting diode, so that when the light-emitting diode is in a non-working state, control and The protection circuit electrically connected to the light-emitting diode performs overcurrent protection.

In the driving method provided by this embodiment, in step S11, the working state of each light-emitting diode 13 is detected by detecting the control on the data line SL and the gate line GL electrically connected to each light-emitting diode 13 Signal realization. Taking the light-emitting diode 13 in FIG. 3 as an example, detecting the working state of the light-emitting diode 13 is achieved by detecting the driving signals on the data line SL1 and the gate line GL1 electrically connected to the light-emitting diode 13.

During the display period of the display panel 10, the output timing of the driving signal for controlling each light-emitting diode 13 to emit light is determined according to the image data. In the circuit shown in Figure 3, when it is detected that the level of the drive signal on the gate line GL1 is lower than the level of the drive signal on the data line SL1, and the level difference is greater than a threshold (by the structural characteristics of the light-emitting diode 13 When it is determined), it is judged that the light-emitting diode 13 is in the working (light-emitting) state at this time. When the level of the drive signal on the gate line GL1 is higher than the level of the drive signal on the data line SL1, it is judged that the light is on at this time The diode 13 is in a non-operating (closed) state.

In step S12, as described above, when it is detected that the light-emitting diode 13 is in the working state, the driver 15 controls the first switch unit 141 to maintain conduction, so that a conduction loop is formed between the positive and negative electrodes of the light-emitting diode 131; the light-emitting diode 13 When in a non-working state, the driver 15 controls the first switch unit 141 to keep an open circuit to control that the light-emitting diode 13 cannot form a conduction loop between the positive and negative electrodes, and can not form a reverse bias current, which can effectively prevent the light-emitting diode 13 from over-current burning , Thereby realizing the overcurrent protection of the light emitting diode 13.

In the display panel 10 provided in this embodiment, each light-emitting diode 13 is electrically connected to a protection circuit 14. According to the characteristics of the light-emitting diode 13, the light-emitting diode 13 has a reverse bias current in the non-working state. The protection circuit 14 is used for over-current protection when the electrically connected light-emitting diode 13 is in a non-working state. On the one hand, it is beneficial to improve the influence of the reverse bias current on the display, and on the other hand, it can also effectively prevent the light-emitting diode 13 Overcurrent burned. Example two

Referring to FIG. 5, the display panel 20 provided by this embodiment differs from the first embodiment mainly in that the circuit structure of the protection circuit 24 in this embodiment is different from that of the protection circuit 14 in the first embodiment.

In this embodiment, each protection circuit 24 includes a first switch unit 241 and a second switch unit 242. Wherein, 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 unit 242 is electrically connected to the anode of the light emitting diode 23 and the gate line GL. The data line SL electrically connected to the light-emitting diode 23.

Please continue to refer to FIG. 5, in this embodiment, the driver 25 is used to output a control signal to each protection circuit 24 to control each protection circuit 24 to turn on or open, so as to control each light emitting diode 23 electrically connected to each protection circuit 24 to maintain In the state of conduction or short circuit.

，第一控制端s及第二控制端

皆電連接驅動器15，用於接收驅動器15輸出的控制信號；第一開關單元241還具有一輸入端x及輸出端f，輸入端x電連接發光二極體23的負極，輸出端f電連接發光二極體23所電連接的閘極線GL1。第二開關單元242的第一控制端s及第二控制端

皆電連接驅動器15，用於接收驅動器15輸出的控制信號；第二開關單元242的輸入端x電連接發光二極體23的負極，且電連接於發光二極體23的負極與第一發光單元241的輸入端x之間的節點，輸出端f電連接發光二極體23所電連接的資料線SL1。Referring to FIG. 6, in this embodiment, the circuit structure of the first switch unit 241 and the second switch unit 242 in each protection circuit 24 is the same, but the specific connection modes are different. 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

, The first control terminal s and the second control terminal

All are electrically connected to the driver 15 for receiving the control signal output by the driver 15; the first switch unit 241 also has an input terminal x and an output terminal f, the input terminal x is electrically connected to the negative electrode of the light emitting diode 23, and the output terminal f is electrically connected The gate line GL1 to which the light emitting diode 23 is electrically connected. The first control terminal s and the second control terminal of the second switch unit 242

Are electrically connected to the driver 15 for receiving the control signal output by the driver 15; the input terminal x of the second switch unit 242 is electrically connected to the negative electrode of the light emitting diode 23, and is electrically connected to the negative electrode of the light emitting diode 23 and the first light emitting diode The node between the input terminals x and the output terminal f of the unit 241 are electrically connected to the data line SL1 electrically connected to the light emitting diode 23.

，控制第一開關單元241保持導通，並輸出控制信號至第二開關單元242的第一控制端s和第二控制端

，控制第二開關單元242保持開路，則發光二極體23正負極之間形成導通回路，驅動器25藉由控制發光二極體23所電連接的資料線SL1和閘極線GL1上的電壓，以控制發光二極體23發光。Please continue to refer to FIG. 6, when the light emitting diode 23 is in the working state, the driver 25 respectively outputs control signals to the first control terminal s and the second control terminal of the first switch unit 241

, The first switch unit 241 is controlled to remain on, and a control signal is output to the first control terminal s and the second control terminal of the second switch unit 242

By controlling the second switch unit 242 to remain open, a conduction loop is formed between the positive and negative electrodes of the light-emitting diode 23, and the driver 25 controls the voltage on the data line SL1 and the gate line GL1 that are electrically connected to the light-emitting diode 23, To control the light-emitting diode 23 to emit light.

，控制第一開關單元241保持開路，並輸出控制信號至第二開關單元242的第一控制端s和第二控制端

，控制第二開關單元242保持導通，此時發光二極體23被短路，發光二極體23正負極之間的電壓幾乎相等，正負極之間的電壓差極小，則此時產生的反偏電流幾乎為零。When the light emitting diode 23 is in a non-working state, the driver 25 respectively outputs control signals to the first control terminal s and the second control terminal of the first switch unit 241

, The first switch unit 241 is controlled to remain open, and a control signal is output 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 maintain conduction. At this time, the light-emitting diode 23 is short-circuited, the voltage between the positive and negative electrodes of the light-emitting diode 23 is almost equal, and the voltage difference between the positive and negative electrodes is extremely small, and the reverse bias is generated at this time The current 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 non-operating light-emitting diode 23 on the display image of the display panel 20 on the one hand, and on the other hand, it can be controlled to be in the non-operating state. The reverse bias current of the light-emitting diode 23 in the state is almost zero, which can effectively prevent the light-emitting diode 23 from over-current and burn out. Example three

Referring to FIG. 7, the display panel 30 provided in this embodiment differs from the second embodiment mainly in that the circuit structure of the protection circuit 34 in this embodiment is different from that of the protection circuit 24 in the second embodiment.

In this embodiment, each protection circuit 34 includes a first switch unit 341 and a resistance element 342. The circuit structure and connection mode of the first switch unit 341 and the first switch unit 241 in the second embodiment are basically the same, and will not be described again. The resistance element 342 is electrically connected to the positive electrode of the light emitting diode 33 and the data line SL electrically connected to the light emitting diode 33, respectively.

Please continue to refer to FIG. 7. In this embodiment, the driver 35 is used to output a control signal to each protection circuit 34 to control each protection circuit 34 to turn on or open, so as to control each light emitting diode 33 electrically connected to each protection circuit 34 to maintain In the state of conduction or short circuit.

，控制第一開關單元341保持導通，則發光二極體33正負極之間形成導通回路，驅動器35藉由控制發光二極體33所電連接的資料線SL1和閘極線GL1上的電壓，以控制發光二極體33發光。發光二極體33處於非工作狀態時，驅動器35分別輸出控制信號至第一開關單元341的第一控制端s和第二控制端

，控制第一開關單元341保持開路，此時發光二極體33被短路，正負極之間的電壓幾乎相等，正負極之間的電壓差極小，則此時產生的反偏電流幾乎為零。Referring to FIG. 8, when the light emitting diode 33 is in the working state, the driver 35 respectively outputs control signals to the first control terminal s and the second control terminal of the first switch unit 341

, The first switch unit 341 is controlled to maintain conduction, then a conduction loop is formed between the positive and negative electrodes of the light-emitting diode 33, and the driver 35 controls the voltage on the data line SL1 and the gate line GL1 electrically connected to the light-emitting diode 33, To control the light-emitting diode 33 to emit light. When the light emitting diode 33 is in a non-working state, the driver 35 respectively outputs control signals to the first control terminal s and the second control terminal of the first switch unit 341

, The first switch unit 341 is controlled to remain open. At this time, the light emitting diode 33 is short-circuited, the voltage between the positive and negative electrodes is almost equal, and 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 non-working light-emitting diode 33 on the display image of the display panel 30 on the one hand, and on the other hand, it can be controlled to be non-working. The reverse bias current of the light-emitting diode 33 in the state is almost zero, which can effectively prevent the light-emitting diode 33 from over-current and burn out. Example four

Referring to FIG. 9, the display panel 30 provided in this embodiment differs from the third embodiment mainly in that the circuit structure of the protection circuit 44 in this embodiment is different from that of the protection circuit 34 in the third embodiment.

In this embodiment, each protection circuit 44 includes a first switch unit 441, and each light emitting diode 43 has a built-in resistance structure 431. The circuit structure and connection mode of the first switch unit 441 and the first switch unit 341 in the third embodiment are basically the same, and will not be described again. The main difference from the third embodiment is that in this embodiment, the resistance structure 431 is integrated with the light-emitting diode 43, and the resistance structure 431 is formed in the process of manufacturing the light-emitting diode 43. The internal structure of the diode 43, the two ends of the resistance structure 431 are connected in parallel between the two electrodes of the light emitting diode 43, so the resistance structure 431 is transferred together when the light emitting diode 43 is transferred to the substrate 41; 7 again, the resistance element 342 in the third embodiment is a structure independent of the light-emitting diode 33, so the resistance element 342 in the third embodiment can be used when the light-emitting diode 33 has not been transferred to the substrate 31. It has been installed on the main board (not shown) of the display panel 30.

Please continue to refer to FIG. 9. In this embodiment, the driver 45 is used to output a control signal to each protection circuit 44 to control each protection circuit 44 to turn on or open, so as to control the light emitting diodes 43 electrically connected to each protection circuit 44 to maintain In the on or off state.

，控制第一開關單元441保持導通，則發光二極體43正負極之間形成導通回路，驅動器45藉由控制發光二極體43所電連接的資料線SL1和閘極線GL1上的電壓，以控制發光二極體33發光。發光二極體43處於非工作狀態時，驅動器45分別輸出控制信號至第一開關單元441的第一控制端s和第二控制端

，控制第一開關單元441保持開路，此時發光二極體33保持斷路，正負極之間的電壓幾乎相等，不能形成反偏電流。Please refer to FIG. 10, when the light emitting diode 43 is in the working state, the driver 45 respectively outputs control signals to the first control terminal s and the second control terminal of the first switch unit 441

, The first switch unit 441 is controlled to maintain conduction, and then a conduction loop is formed between the positive and negative electrodes of the light-emitting diode 43. The driver 45 controls the voltage on the data line SL1 and the gate line GL1 electrically connected to the light-emitting diode 43, To control the light-emitting diode 33 to emit light. When the light-emitting diode 43 is in a non-working state, the driver 45 respectively outputs control signals to the first control terminal s and the second control terminal of the first switch unit 441

, The first switch unit 441 is controlled to remain open. At this time, the light-emitting diode 33 remains open, and the voltage between the positive and negative electrodes is almost equal, and no reverse bias current can be formed.

Therefore, the display panel 40 provided in this embodiment can effectively reduce the influence of the reverse bias current generated by the non-working light-emitting diode 43 on the display image of the display panel 40 on the one hand, and on the other hand, it can be controlled to be in the non-working state. The reverse bias current of the light-emitting diode 43 in the state is almost zero, which can effectively prevent the light-emitting diode 43 from being burned out by overcurrent.

Further, as the display panel 10 described in the first embodiment, the display panel 20 described in the second embodiment, the display panel 30 described in the third embodiment, and the display panel 40 described in the fourth embodiment, light-emitting two The electrical connection of the pole body 13 (23, 33, 43) with the gate line GL and the data line SL can be changed. Specifically, as the light-emitting diodes 13 (23, 33, and 43) in the first to fourth embodiments, the positive electrode is electrically connected to a data line SL, and the negative electrode is electrically connected to a gate line GL; in a modified embodiment of the present invention Among them, the light emitting diode 13 (23, 33, and 43) can also be electrically connected to a gate line GL with its positive electrode and a data line SL with its negative electrode.

When the light emitting diode 13 (23, 33, and 43) is electrically connected to the gate line GL at the anode and the data line SL at the cathode, the signal output method on the gate line GL and the data line SL is the same as in the first to fourth embodiments above The signal output mode is just the opposite. That is, for each light emitting diode 13 (23, 33, and 43), the voltage on the gate line GL electrically connected to it is greater than the voltage on the data line SL to which it is electrically connected, and the gate line GL and When the voltage difference on 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 working state; when the gate line electrically connected to it The voltage on GL is greater than the voltage on the data line SL to which it is electrically connected, 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 When the voltage on the electrically connected gate line GL is less than the voltage on the data line SL to which it is electrically connected, the light-emitting diodes 13 (23, 33, and 43) are in a non-operating state.

The above-mentioned display panel is also protected by the present invention. Example five

The driving method provided in this embodiment includes the following steps: Step S21, detecting the working state of each light-emitting diode; Step S22, according to the working state of each light-emitting diode, output a control signal to each gate line to control each gate line to conduct or float with the driver.

In this embodiment, the above driving method is applied to the display panel 50 shown in FIG. 11. The main difference between the display panel 50 and the display panel 10 is that the display panel 50 in FIG. 11 does not include the protection circuit 14.

As in the above-mentioned driving method, in step S21, detecting the working state of the light-emitting diode 53 is implemented by the method as described in the first embodiment, and will not be repeated. If it is detected in step S21 that the light-emitting diode is in a working state, the driver 55 outputs a control signal to the gate line GL electrically connected to the light-emitting diode 53 in step S22, and controls the gate line GL to continuously output the corresponding driving voltage To the light-emitting diode 53 makes the light-emitting diode 53 emit light. If it is detected in step S21 that the light-emitting diode is in a non-working state, in step S22, the driver 55 outputs a control signal to the gate line GL electrically connected to the light-emitting diode 53 to control the gate line GL to be in a floating state, No driving signal is output to the light emitting diode 53, and the light emitting diode 53 does not emit light.

The driving method provided in this embodiment controls the gate line GL electrically connected to the light-emitting diode 53 to be in a floating state when it is detected that the light-emitting diode 53 is in a non-working state, so that the voltage between the positive and negative electrodes of the light-emitting diode is different. Very small, the reverse bias current in the light-emitting diode 53 can be controlled to be almost zero. On the one hand, it can effectively reduce the influence of the reverse bias current generated by the non-working light-emitting diode 53 on the display image of the display panel 50. On the other hand, By controlling the reverse bias current of the light-emitting diode 53 in the non-working state to be almost zero, the light-emitting diode 53 can be effectively prevented from over-current burning.

Further, compared with the first to fourth embodiments, the driving method provided in this embodiment does not need to use the 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 simplify the display. The structure of the panel saves the production cost of the display panel. Example Six

The driving method provided in this embodiment includes the method steps described in the fifth embodiment, and is applied to the display panel 60 as shown in FIG. 12. The main difference between the display panel 60 and the display panel 50 is that each light-emitting diode 63 The connection method is different.

Please continue to refer to FIG. 12. In this embodiment, the positive electrode of each light emitting diode 63 is electrically connected to a gate line GL, and the negative electrode is electrically connected to a data line SL. Then for each light emitting diode 63, the voltage on the gate line GL electrically connected to it is greater than the voltage on the data line SL to which it is electrically connected, and the voltage difference between the gate line GL and the data line SL is greater than the light emitting diode At the threshold voltage of the diode 63, the light-emitting diode is in the working state. Then, in step S21, when the signal on the gate line GL is detected to be at a high level, it is determined that the light-emitting diode 63 is in the working state and the gate is detected. When the signal on the polar line GK is at a low level, it is determined that the light emitting diode 63 is in a non-working state.

As described in the fifth embodiment, the driving method provided in this embodiment controls the gate line GL electrically connected to the light-emitting diode 63 to be in a floating state when it is detected that the light-emitting diode 63 is in a non-working state. The voltage difference between the positive and negative electrodes 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 the one hand, it can effectively reduce the reverse bias current generated by the non-working light-emitting diode 63 to the display panel. 60 shows the influence of the image, on the other hand, by controlling the reverse bias current of the non-working light-emitting diode 63 to be almost zero, the light-emitting diode 63 can be effectively prevented from over-current burning.

Further, compared with the first to fourth embodiments, the driving method provided in this embodiment does not need to use the 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 simplify the display. The structure of the panel saves the production cost of the display panel.

Those of ordinary skill in the art should realize that the above embodiments are only used to illustrate the present invention, and not to limit the present invention. As long as they fall within the essential spirit of the present invention, the above embodiments are appropriately made. Changes and changes fall within the scope of protection of the present invention.

:第二控制端 x:輸入端 f:輸出端10, 20, 30, 40, 50, 60: display panel 11, 21, 31, 41, 51, 61: substrate 12, 22, 32, 42: sub-pixel 13, 23, 33, 43, 53, 63: Light emitting diode 431: resistance structure 14, 24, 34, 44: protection circuit 141, 241, 341, 441: first switch unit 242: second switch unit 342: resistance element 15, 25, 35, 45, 55, 65: Driver GL, GL1, GL2, GLm: Gate line SL, SL1, SL2, SLn: Data line s: First control terminal

: Second control terminal x: input terminal f: output terminal

FIG. 1 is a schematic diagram of a planar structure of a display panel provided by Embodiment 1 of the present invention.

Fig. 2 is a schematic diagram of the V-I characteristic curve of the light-emitting diode in Fig. 1.

Fig. 3 is a circuit structure diagram in a sub-pixel in Fig. 1.

Fig. 4 is a waveform diagram of the driving signal on the data line and the gate line in Fig. 3.

FIG. 5 is a schematic diagram of a planar structure of a display panel provided by the second embodiment of the present invention.

Fig. 6 is a circuit structure diagram in a sub-pixel in Fig. 5.

FIG. 7 is a schematic diagram of a planar structure of a display panel provided by Embodiment 3 of the present invention.

Fig. 8 is a circuit structure diagram in a sub-pixel in Fig. 7.

FIG. 9 is a schematic diagram of a planar structure of a display panel provided by the fourth embodiment of the present invention.

Fig. 10 is a circuit structure diagram in a sub-pixel in Fig. 9.

FIG. 11 is a schematic diagram of a planar structure of a display panel to which the driving method provided in the fifth embodiment of the present invention is applied.

FIG. 12 is a schematic diagram of a planar structure of a display panel to which the driving method provided in the sixth embodiment of the present invention is applied.

10: Display panel

11: substrate

12: Sub-pixel

13: Light-emitting diode

14: Protection circuit

15: drive

GL, GL1, GL2, GLm: gate line

SL, SL1, SL2, SLn: data line

Claims (10)

A display panel is improved in that it includes: m gate lines are arranged at intervals along the first direction, where m>2; n data lines are arranged at intervals along the second direction, where n>2, the m gate lines and the n data lines are insulated and intersected, and the m gate lines and the n data lines Insulation cross defines plural sub-pixels; A plurality of light-emitting diodes, each light-emitting diode is formed in a sub-pixel, and each light-emitting diode is respectively electrically connected to a data line and a gate line that define the sub-pixel where the light-emitting diode is located ； A plurality of protection circuits, the plurality of protection circuits are electrically connected to the plurality of light-emitting diodes in a one-to-one correspondence, and each protection circuit is used for over-current protection when the electrically connected light-emitting diodes are in a non-working state; A driver, which is electrically connected to the m gate lines, the n data lines, and the plurality of protection circuits, and is used to control the working state of each light-emitting diode, and according to the working state of each light-emitting diode Outputting a control signal to the plurality of protection circuits to switch the electrical connection relationship between the plurality of protection circuits and each light emitting diode. The display panel according to claim 1, wherein the driver outputs a control signal to each protection circuit to control the conduction or opening of each protection circuit, so as to control the conduction, short-circuit or open circuit of each light-emitting diode electrically connected to each protection circuit. The display panel according to claim 2, wherein each protection circuit includes a first switch unit; The driver is used to control the first switch unit to conduct when the light emitting diode electrically connected to the protection circuit is in a working state, and when the light emitting diode electrically connected to the protection circuit is in a non-working state , Control the first switch unit to open. The display panel according to claim 3, wherein each switch unit is electrically connected to a negative electrode of a light-emitting diode and a data line electrically connected to the light-emitting diode. The display panel according to claim 3, wherein each of the first switch units is electrically connected to an anode of a light emitting diode and a gate line electrically connected to the light emitting diode. The display panel according to claim 5, wherein each protection circuit further includes a second switch unit; The second switch unit is electrically connected to the positive electrode of the light emitting diode electrically connected to the first switch unit and the data line electrically connected to the light emitting diode; When the light-emitting diode is in the working state, the driver controls the first switch unit to turn on and controls the second switch unit to open, and when the light-emitting diode is in the non-working state, the driver controls the The first switching unit is disconnected and the second switching unit is controlled to be turned on. The display panel according to claim 5, wherein the protection circuit further includes a resistance element, and the resistance element is electrically connected to the negative electrode of the light-emitting diode electrically connected to the protection circuit and the light-emitting diode. Data cable for electrical connection. The display panel according to claim 5, wherein each light-emitting diode has a built-in resistance structure, and two ends of the resistance structure are electrically connected to the positive electrode and the negative electrode of the light-emitting diode, respectively. A driving method, which is improved in that it is applied to the display panel according to any one of claims 1 to 8. The driving method includes the following steps: Detect the working status of each light-emitting diode; According to the working state of each light-emitting diode, output a control signal to switch the electrical connection relationship between the plurality of protection circuits and each light-emitting diode, so as to control the light-emitting diode when the light-emitting diode is in a non-working state. The protection circuit electrically connected to the diode performs overcurrent protection. A driving method, which includes the following steps: Detect the working status of each light-emitting diode; According to the working state of each light-emitting diode, a control signal is output to each gate line to control each gate line to conduct or float with the driver.

Images