Pixel driving module, pixel driving method, liquid crystal display panel and device

Abstract

The embodiments of the present application relate to a pixel driving module, a pixel driving method, a liquid crystal display panel and a device. The module includes: a row driving unit, a column driving unit and a pixel matrix. The pixel matrix is ​​composed of a plurality of pixel units, each pixel unit includes a first transistor, a second transistor and a light-emitting device; a target pixel unit is arranged in a rectangular area formed between two adjacent row data lines and two adjacent column data lines, the control end and the first end of the first transistor in the target pixel unit are respectively connected to the column data line where the right boundary of the rectangular area is located, and the control end and the first end of the second transistor are respectively connected to the row data line where the upper boundary of the rectangular area is located. By adding a transistor to block the branch when a short circuit occurs in the light-emitting device, other display devices are prevented from lighting up abnormally, thereby avoiding abnormal display due to pixel short circuit, and achieving the technical effect of improving the screen display quality.

Description

Technical Field

[0001] Embodiments of the present application relate to the technical field of drive control of display panels, and in particular to a pixel drive module, a pixel drive method, a liquid crystal display panel and a device. Background Art

[0002] With the development of fine pitch display screens, LED display screens have put forward higher requirements for row drivers, from simple P-type oxide semiconductor field effect transistors (P-MOSFET) to achieve row switching, to more integrated and powerful multifunctional row drivers. When the data signal of the control row is low, the voltage on the row line will be pulled up, the data of the column tube will be displayed, and then different LED light brightness will be obtained.

[0003] Because the LEDs are transferred one by one to the array substrate of the display screen, it is easy for poor connection to cause a short circuit in the LED lamp beads during use. This abnormality will cause a short-circuit caterpillar phenomenon, which will cause abnormal display of the lamp beads around the short-circuited LED. Summary of the invention

[0004] In view of this, in order to solve the technical problem that the LED lamp beads of the above-mentioned display screen cause display abnormality when a short circuit occurs, the embodiments of the present application provide a pixel driving module, a pixel driving method, a liquid crystal display panel and a device.

[0005] In a first aspect, an embodiment of the present application provides a pixel driving module for driving a display panel, comprising:

[0006] A row driving unit, a column driving unit and a pixel matrix, wherein the pixel matrix is ​​composed of a plurality of pixel units, each of which comprises a first transistor, a second transistor and a light emitting device;

[0007] The row driving unit is connected to a plurality of row data lines arranged in parallel, the row data lines are used to output row scanning signals, the column driving unit is connected to a plurality of column data lines arranged in parallel, the column data lines are used to output pixel signals, and the row data lines are in a perpendicular relationship to the column data lines;

[0008] A target pixel unit is arranged in a rectangular area formed between two adjacent row data lines and two adjacent column data lines, the control end and the first end of the first transistor in the target pixel unit are respectively connected to the column data line where the right boundary of the rectangular area is located, the second end of the first transistor is connected to the first end of the light-emitting device, the second end of the light-emitting device is connected to the second end of the second transistor in the target pixel unit, and the control end and the first end of the second transistor are respectively connected to the row data line where the upper boundary of the rectangular area is located.

[0009] In a possible implementation manner, the first transistor and the second transistor are transistors of different types.

[0010] In a possible implementation manner, the first transistor is a first PMOS transistor, the second transistor is a first NMOS transistor, and the light emitting device is a first light emitting diode;

[0011] The gate and drain of the first PMOS tube are respectively connected to the column data line at the right boundary of the rectangular area, and the source of the first PMOS tube is connected to the reverse output end of the first light-emitting diode;

[0012] The forward input terminal of the first light emitting diode is connected to the source of the first NMOS tube;

[0013] The gate and drain of the first NMOS tube are respectively connected to the row data line where the upper boundary of the rectangular area is located.

[0014] In a possible implementation manner, the first transistor is a second NMOS transistor, the second transistor is a second PMOS transistor, and the light emitting device is a second light emitting diode;

[0015] The gate and drain of the second NMOS tube are respectively connected to the column data line where the right boundary of the rectangular area is located, and the source of the second NMOS tube is connected to the positive input terminal of the second light-emitting diode;

[0016] The reverse output end of the second light emitting diode is connected to the source of the second PMOS tube;

[0017] The gate and drain of the second PMOS tube are respectively connected to the row data line where the upper boundary of the rectangular area is located.

[0018] In a second aspect, an embodiment of the present application provides a pixel driving method, which is applied to the pixel driving module as described in any one of the first aspects, including:

[0019] Scanning the row data lines in row order through the row driving unit, and outputting the output voltages corresponding to the column data lines through the column driving unit;

[0020] Determine whether the light emitting device currently connected to the row data line is short-circuited according to the output voltage;

[0021] When the light emitting device is short-circuited, determining a first switching state of the first transistor, and determining a second switching state of the second transistor;

[0022] The pixel unit is driven and controlled according to the first switch state and the second switch state.

[0023] In a possible implementation manner, determining whether a light emitting device currently connected to the row data line is short-circuited according to the output voltage includes:

[0024] When the output voltage output by the target column data line is at a low level, determining that a branch where the light emitting device between the target column data line and the current row data line is located is not short-circuited;

[0025] When the output voltage output by the target column data line is at a high level, it is determined that a short circuit occurs in a branch where the light emitting device between the target column data line and the current row data line is located.

[0026] In a possible implementation, when the light emitting device is short-circuited, determining a first switching state of the first transistor and determining a second switching state of the second transistor include:

[0027] When the first transistor is a first PMOS transistor and the second transistor is a first NMOS transistor, obtaining a first target voltage output by a current row data line, and obtaining a second target voltage of a column data line connected to a branch where the light-emitting device is located;

[0028] When the light emitting device is short-circuited, determining that the first target voltage is at a high level and the second target voltage is at a high level;

[0029] Determining, according to the first target voltage, that the first switch state of the first PMOS tube is a first off state;

[0030] The second switch state of the first NMOS tube is determined to be a first conduction state according to the second target voltage.

[0031] In a possible implementation, when the light emitting device is short-circuited, determining a first switching state of the first transistor and determining a second switching state of the second transistor include:

[0032] When the first transistor is a second NMOS transistor and the second transistor is a second PMOS transistor, a third target voltage output by the current row data line is obtained, and a fourth target voltage corresponding to the column data line connected to the branch where the light-emitting device is located is obtained;

[0033] When the light emitting device is short-circuited, determining that the third target voltage is at a high level, and the fourth target voltage is at a high level;

[0034] Determine, according to the third target voltage, that the first switch state of the second NMOS tube is a second conduction state;

[0035] The second switch state of the second PMOS tube is determined to be a second off state according to the fourth target voltage.

[0036] In a possible implementation, the performing drive control on the pixel unit according to the first switch state and the second switch state includes:

[0037] When the first switch state is a first off state and the second switch state is a first on state, the pixel unit where the short-circuited light-emitting device is located is controlled to remain in an off state, so that the short-circuited light-emitting device does not affect the display of other light-emitting devices;

[0038] When the first switch state is the second on state and the second switch state is the second off state, the pixel unit where the short-circuited light-emitting device is located is controlled to remain in an off state so that the short-circuited light-emitting device does not affect the display of other light-emitting devices.

[0039] In a third aspect, an embodiment of the present application provides a liquid crystal display panel, comprising an array substrate and a color filter substrate arranged in a box, a liquid crystal layer being arranged between the array substrate and the color filter substrate, comprising: the array substrate has a pixel driving module as described in any one of the first aspects.

[0040] In a fourth aspect, an embodiment of the present application provides a display device, comprising: a housing, a backlight module disposed in the housing, and a liquid crystal display panel as described in the third aspect.

[0041] The pixel driving module provided by the embodiment of the present application is provided by setting a row driving unit, a column driving unit and a pixel matrix, wherein the pixel matrix is ​​composed of a plurality of pixel units, each of which comprises a first transistor, a second transistor and a light-emitting device; the row driving unit is connected to a plurality of row data lines arranged in parallel, the row data lines are used to output row scanning signals, the column driving unit is connected to a plurality of column data lines arranged in parallel, the column data lines are used to output pixel signals, and the row data lines are in a vertical relationship with the column data lines; a target pixel unit is provided in a rectangular area formed between two adjacent row data lines and two adjacent column data lines, the control end and the first end of the first transistor in the target pixel unit are respectively connected to the column data line where the right boundary of the rectangular area is located, the second end of the first transistor is connected to the first end of the light-emitting device, the second end of the light-emitting device is connected to the second end of the second transistor in the target pixel unit, and the control end and the first end of the second transistor are respectively connected to the row data line where the upper boundary of the rectangular area is located. By adding a transistor to block the branch when a short circuit occurs in the light-emitting device, other display devices are prevented from lighting up abnormally, and this solution can achieve the technical effect of avoiding abnormal display due to pixel short circuit, thereby improving the display quality of the screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0043] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0044] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0045] Figure 1A A schematic diagram of the structure of a pixel driving module provided in the prior art;

[0046] Figure 1B A schematic diagram of a structure of a pixel driving module provided in the prior art where a short circuit occurs;

[0047] Figure 1C A schematic diagram of the structure of another pixel driving module provided in the prior art in which a short circuit occurs;

[0048] Figure 2 A schematic diagram of the structure of a pixel driving module provided in an embodiment of the present application;

[0049] Figure 3 A schematic diagram of the structure of another pixel driving module provided in an embodiment of the present application;

[0050] Figure 4 A schematic diagram of the structure of another pixel driving module provided in an embodiment of the present application;

[0051] Figure 5 A schematic diagram of a process of a pixel driving method provided in an embodiment of the present application;

[0052] Figure 6 A schematic diagram of a flow chart of another pixel driving method provided in an embodiment of the present application;

[0053] Figure 7 A schematic diagram of the structure of a liquid crystal display panel provided in an embodiment of the present application;

[0054] Figure 8 A schematic diagram of the structure of a display device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0056] The terms "including" and "having" in the embodiments of the present application are used to express an open-ended inclusive meaning, and mean that in addition to the listed elements / components / etc., there may be additional elements / components / etc.; the terms "first" and "second" etc. are used only as labels and are not intended to limit the quantity of their objects. In addition, the different elements and regions in the drawings are only schematically shown, so the present application is not limited to the sizes or distances shown in the drawings.

[0057] Figure 1A It is a structural schematic diagram of a pixel driving module provided in the prior art. According to the diagram provided in FIG1, the pixel driving module structure in the prior art includes: a row driving unit, a column driving unit, an LED lamp bead array, and a row scanning line and a column data line. When the data signal controlling the row is at a low level, the voltage on the row line (i.e., the anode voltage of the LED lamp bead) will be pulled up, and the data on the column data line (which can be understood as the voltage on the cathode of the LED lamp) will be displayed, thereby lighting up the LED lamp bead. However, when the LED is not firmly connected to the row scanning line or the column data line, the LED lamp bead will short-circuit, thereby affecting the display state of the LED lamp bead. This LED lamp bead short-circuit phenomenon is called the short-circuit caterpillar phenomenon.

[0058] When the LED lamp bead is short-circuited, it is assumed by default that the LED does not exist. When there is no LED lamp bead, there is a display abnormality. Figure 1B The schematic diagram of the structure of a pixel driving module provided in the prior art in which a short circuit occurs. Figure 1B The diagram provided refers to the LED lamp with the anode connected to the row scan line and the LED lamp with the cathode connected to the column data line as an example. Figure 1B When LED5 is short-circuited, if the discharge voltage is too low (assuming 0V) after the second scan line Scan2 is turned off, after LED5 is short-circuited, when the third scan line Scan3 is turned on, the row voltage will be pulled up. Even if there is no data in LED4 corresponding to the output voltage of OUT1, the positive and negative voltage difference of LED4 (Vscan3-Vscan2=5V) is greater than the conduction voltage Vf of LED4, causing LED4 to remain lit. The same is true for other rows, which will cause the caterpillar to be always on.

[0059] according to Figure 1CThis is a schematic diagram of a pixel driving module with a short circuit in the prior art. If the discharge voltage is too high (assuming 3.6V) after the second scan line Scan2 is turned off, and LED5 is short-circuited, when the third scan line Scan3 is turned on, the row voltage will be pulled up, causing the cathode potential of LED4 to increase. Even if LED4 of OUT1 has data, the positive and negative voltage difference of LED4 (Vscan3-Vscan2=1.4V) is less than the conduction voltage Vf of LED4, causing LED4 to not light up. The same is true for other rows, which will result in a dark caterpillar. This means that when an LED bead is short-circuited in the display panel, the display effect around the short-circuited LED bead will also be affected.

[0060] In order to solve the problem of abnormal display when the above-mentioned LED lamp beads are short-circuited, the present application proposes a pixel driving module, which adds switching tubes on both sides of the LED lamp beads. When any LED lamp bead is short-circuited, the branch where the short circuit occurs is disconnected by utilizing the switch action, thereby blocking the influence of the short-circuited LED on the display of other LED lamps, thereby solving the problem of abnormal display of other LED lamps caused by LED short circuit.

[0061] To facilitate understanding of the embodiments of the present application, further explanation will be given below with reference to specific embodiments in conjunction with the accompanying drawings. The embodiments do not constitute a limitation on the embodiments of the present application.

[0062] Figure 2 A schematic diagram of the structure of a pixel driving module provided in an embodiment of the present application. Applicable to avoid display abnormality when a short circuit occurs in a display panel. Figure 2 According to the diagram provided, the pixel driving module specifically includes:

[0063] The row driving unit 11 , the column driving unit 12 and the pixel matrix 100 , the pixel matrix 100 is composed of a plurality of pixel units 10 , each pixel unit 10 includes a first transistor P1 , a second transistor P2 and a light emitting device D.

[0064] The row driving unit 11 is connected to a plurality of row data lines arranged in parallel, the row data lines are used to output row scanning signals, and the column driving unit 12 is connected to a plurality of column data lines arranged in parallel, the column data lines are used to output pixel signals, and the row data lines are perpendicular to the column data lines.

[0065] A target pixel unit is arranged in a rectangular area formed between two adjacent row data lines and two adjacent column data lines, the control end and the first end of the first transistor P1 in the target pixel unit are respectively connected to the column data line where the right boundary of the rectangular area is located, the second end of the first transistor P1 is connected to the first end of the light-emitting device D, the second end of the light-emitting device D is connected to the second end of the second transistor P2 in the target pixel unit, and the control end and the first end of the second transistor P2 are respectively connected to the row data line where the upper boundary of the rectangular area is located.

[0066] The first transistor and the second transistor are transistors of different types.

[0067] according to Figure 2 In the diagram provided, when the row driving unit drives the second row scan line Scan2, the row where the second row scan line Scan2 is located is powered on, and since the light-emitting device D between the second row scan line and the second column data line is short-circuited, at the same time, under the action of the first transistor P1 and the second transistor P2, one transistor is kept on and the other transistor is kept off, so that the branch where the short-circuited light-emitting device is located is in a disconnected state; in this way, after the second row scan line is turned off, no matter whether the voltage on the second row scan line is a high level or a low level, one of the first transistor and the second transistor is in a disconnected state, thereby blocking the voltage abnormality of other light-emitting devices, and ensuring the purpose of normal light emission of other light-emitting devices except the short-circuited light-emitting device.

[0068] The pixel driving module provided by the embodiment of the present application is provided with a row driving unit, a column driving unit and a pixel matrix, wherein the pixel matrix is ​​composed of a plurality of pixel units, each pixel unit includes a first transistor, a second transistor and a light-emitting device; the row driving unit is connected to a plurality of row data lines arranged in parallel, the row data lines are used to output row scanning signals, the column driving unit is connected to a plurality of column data lines arranged in parallel, the column data lines are used to output pixel signals, and the row data lines are in a vertical relationship with the column data lines; a target pixel unit is provided in a rectangular area formed between two adjacent row data lines and two adjacent column data lines, the control end and the first end of the first transistor in the target pixel unit are respectively connected to the column data line where the right boundary of the rectangular area is located, the second end of the first transistor is connected to the first end of the light-emitting device, the second end of the light-emitting device is connected to the second end of the second transistor in the target pixel unit, and the control end and the first end of the second transistor are respectively connected to the row data line where the upper boundary of the rectangular area is located. By adding a transistor to block the branch when a short circuit occurs in the light-emitting device, other display devices are prevented from lighting up abnormally, and this solution can achieve the technical effect of avoiding abnormal display due to pixel short circuit, thereby improving the display quality of the screen.

[0069] Figure 3 A schematic diagram of the structure of another pixel driving module provided in an embodiment of the present application. Figure 3 This is introduced based on the previous embodiment. Figure 3 According to the diagram provided, the structure of the pixel driving module specifically includes:

[0070] The row driving unit 11, the column driving unit 12 and the pixel matrix 100, the pixel matrix 100 is composed of a plurality of pixel units, each pixel unit includes a first transistor P1, a second transistor P2 and a light emitting device D.

[0071] according to Figure 3 In the provided diagram, the first transistor P1 in the pixel driving module is a first PMOS tube, the second transistor P2 is a first NMOS tube, and the light emitting device D is a first light emitting diode D1.

[0072] The gate and drain of the first PMOS transistor P1 are respectively connected to the column data line at the right boundary of the rectangular area, and the source of the first PMOS transistor P1 is connected to the reverse output end of the first light emitting diode D1.

[0073] The forward input terminal of the first light emitting diode D1 is connected to the source of the first NMOS transistor P2.

[0074] The gate and drain of the first NMOS transistor P2 are respectively connected to the row data line where the upper boundary of the rectangular area is located.

[0075] The first light emitting diode D1 mentioned here can be understood as a light emitting diode provided with the cathode of the LED lamp connected to the column data line and the anode connected to the row data line.

[0076] according to Figure 3 The diagram provided sets the light-emitting diode LED5 to be short-circuited. Due to the different connections of the LED lamp array in the display panel, the selection of transistors is affected. If the cathode of the LED lamp is connected to the column data line and the anode is connected to the row data line, when the column data line is at a low level, the LED lamp will emit light. At this time, the first transistor needs to be turned on. The PMOS transistor meets this condition, and the first transistor P1 is selected as the first PMOS transistor. Similarly, when the cathode of the LED lamp is connected to the column data line and the anode is connected to the row data line, when the row data line is at a high level, the LED lamp will emit light. At this time, the second transistor needs to be turned on. The NMOS transistor meets this condition, and the second transistor P2 is selected as the first NMOS transistor.

[0077] according to Figure 3The diagram provided shows that when the display panel is lit, bad pixel detection is turned on, starting from the first row, and lighting up row by row through the row driving unit. When each row is detected and scanned, the Out channel corresponding to the column data line will be turned on, and then the voltage of the Out channel at that time will be detected (theoretically, the voltage is VLED-VF when there is no bad pixel, and VLED (the voltage on the row data line) when there is a Short short circuit); if the voltage is greater than the threshold voltage set in the chip register, it will be judged that the Short short circuit point is eliminated. When the position of LED5 is scanned, if the voltage on the column data line is detected to be VLED, which is higher than VLED-VF, it is judged that LED5 is short-circuited. However, since Scan2 carries a high-level signal when scanning the row data line, the first NMOS tube P2 is turned on, and the voltage on the column data line will not change at this time, that is, OUT1 is all high voltage; then the first PMOS tube P1 is controlled to remain in the off state, blocking the current of LED5 from affecting the display of other LEDs. When the position of LED6 or LED4 is scanned, although the voltage of OUT1 on the column data line of LED6 or LED4 will be pulled down due to display needs, so that the first PMOS tube P1 is turned on. However, because the voltage on the row data line of Scan2 is at a low level, the first NMOS tube P2 is turned off, and then the branch where LED5 is located is in an open circuit state. Therefore, Scan2 will not be short-circuited with the column line OUT1 even if the LED is short-circuited, avoiding abnormal display of other LEDs due to the short circuit of LED5.

[0078] Figure 4 A schematic diagram of the structure of another pixel driving module provided in an embodiment of the present application. Figure 4 is Figure 2 The following is introduced based on the corresponding embodiments. Figure 4 According to the diagram provided, the structure of the pixel driving module specifically includes:

[0079] The row driving unit 11, the column driving unit 12 and the pixel matrix 100, the pixel matrix 100 is composed of a plurality of pixel units, each pixel unit includes a first transistor P1, a second transistor P2 and a light emitting device D.

[0080] according to Figure 4 In the provided diagram, the first transistor P1 in the pixel driving module is a second NMOS tube, the second transistor P2 is a second PMOS tube, and the light emitting device D is a second light emitting diode D2.

[0081] The gate and drain of the second NMOS transistor P1 are respectively connected to the column data line at the right boundary of the rectangular area, and the source of the second NMOS transistor P1 is connected to the positive input terminal of the second light emitting diode LED.

[0082] The reverse output end of the second light emitting diode D2 is connected to the source of the second PMOS transistor P2.

[0083] The gate and drain of the second PMOS transistor P2 are respectively connected to the row data line where the upper boundary of the rectangular area is located.

[0084] The second light emitting diode D2 mentioned here can be understood as a light emitting diode provided with the anode of the LED lamp connected to the column data line and the cathode connected to the row data line.

[0085] according to Figure 4 The diagram provided sets the light-emitting diode LED5 to be short-circuited. Due to the different connections of the LED lamp array in the display panel, the selection of the transistor is affected. If the anode of the LED lamp is connected to the column data line and the cathode is connected to the row data line, a second light-emitting diode D2 array is obtained. When the column data line is at a high level, the LED lamp will emit light. At this time, the first transistor needs to be turned on. The NMOS transistor meets this condition, and the first transistor P1 is selected as the second NMOS transistor. Similarly, when the row data line is at a low level, the LED lamp will emit light. At this time, the second transistor needs to be turned on. The PMOS transistor meets this condition, and the second transistor P2 is selected as the second PMOS transistor.

[0086] according to Figure 4The diagram provided shows that when the display panel is lit, bad pixel detection is turned on, starting from the first row, and lighting up row by row through the row driving unit. When each row is detected and scanned, the Out channel corresponding to the column data line will be turned on, and then the voltage of the Out channel at that time will be detected (theoretically, the voltage is VLED-VF when there is no bad pixel, and VLED (the voltage on the row data line) when there is a Short short circuit); if the voltage is greater than the threshold voltage set in the chip register, it will be judged that the Short short circuit point is eliminated. When the position of LED5 is scanned, if the voltage on the column data line is detected to be VLED, which is higher than VLED-VF, it is judged that LED5 is short-circuited. However, since Scan2 carries a low-level signal when scanning the row data line, the second PMOS tube P2 is turned on, and the voltage on the column data line will not change at this time, that is, OUT1 is all high voltage; then the second NMOS tube P2 is controlled to remain in the on state, blocking the current of LED5 from affecting the display of other LEDs. When the position of LED6 or LED4 is scanned, although the voltage of OUT1 on the column data line of LED6 or LED4 will be pulled up due to the need of display, so that LED6 and LED4 are normally lit, and the second NMOS tube P1 connected to LED5 is in the on state; but because the voltage on the Scan2 row data line is high, the second PMOS tube P2 is in the off state, and then the branch where LED5 is located is in the open circuit state, then Scan2 will not be short-circuited with the column line OUT1 even if the LED is short-circuited, avoiding abnormal display of other LEDs due to the short circuit of LED5. In addition, when LED5 is short-circuited, it will not cause abnormal light emission of other light-emitting diodes, avoiding abnormal display due to pixel short circuit, and achieving the technical effect of improving the screen display quality.

[0087] The embodiment of the present application provides a pixel driving module, which adds two transistors with opposite functions at both ends of the light-emitting device. When a short circuit occurs in the light-emitting device, the transistor of the branch is controlled to be in an off state so that the branch remains in an off state, thereby avoiding a short circuit between the row data line and the column data line, which affects the brightness of other light-emitting devices, thereby avoiding display abnormalities due to pixel short circuits and achieving the technical effect of improving the screen display quality.

[0088] Figure 5 A schematic diagram of a pixel driving method provided in an embodiment of the present application. Applicable to a pixel driving module. Figure 5 The pixel driving method specifically includes:

[0089] S501 , scanning row data lines in row order through a row driving unit, and outputting output voltages corresponding to column data lines through a column driving unit.

[0090] The present application is applied to the process of controlling the display abnormality of other pixels caused by a short circuit of a light-emitting device during the pixel driving process. By adding two transistors with opposite functions at both ends of the light-emitting device, when a short circuit occurs in the light-emitting device, the transistor of the branch where the light-emitting device is located is controlled to be in an off state so that the branch where the light-emitting device is located remains in an off state, thereby avoiding a short circuit between the row data line and the column data line, which affects the brightness of the light-emitting devices of other light-emitting devices, and achieving the technical effect of avoiding abnormal display caused by a short circuit of a pixel, thereby improving the display quality of the screen.

[0091] The row driving unit mentioned here controls the driving of the row data line, and the column driving unit controls the output of the column data line.

[0092] Furthermore, after the display screen is lit, bad pixel detection is turned on, and detection is performed row by row starting from the first row. When each row is detected and scanned, the OUT channel where the column data line is located is turned on and the voltage of the corresponding light-emitting device is output.

[0093] S502: Determine whether a light-emitting device connected to the data line of the current row is short-circuited according to the output voltage.

[0094] Furthermore, when the row drive unit scans row by row from top to bottom, the column drive unit drives each column and outputs the output voltage of the OUT channel of each column, and detects the voltage of the OUT channel at that time (theoretically, the voltage is VLED-VF when there is no bad point, and VLED (the voltage on the row) when there is a short circuit). If the voltage is greater than the threshold voltage set in the chip register, it will be determined that the short circuit point is eliminated. For example, when the position of the LED lamp is scanned, because the voltage upward in the column is VLED, not VLED-VF, it is determined that the branch where the LED lamp is located is short-circuited.

[0095] S503: When a short circuit occurs in the light emitting device, a first switching state of the first transistor is determined, and a second switching state of the second transistor is determined.

[0096] The first transistor mentioned here can be understood as a transistor controlled by the voltage on the column data line. The second transistor mentioned here can be understood as a transistor controlled by the voltage on the row data line. The first transistor and the second transistor mentioned here are both triodes, such as PMOS transistors, NMOS transistors, IGBTs or bipolar thin film transistors.

[0097] Furthermore, according to the judgment logic, when a short circuit occurs in the light-emitting device, the switching state of the second transistor is determined by the output voltage of the row data line where the short-circuited light-emitting device is located, and the switching state of the first transistor is determined by the output voltage of the column data line where the short-circuited light-emitting device is located, thereby providing reference data for the next step of judging whether a display abnormality occurs in the driving module.

[0098] S504 , performing drive control on the pixel unit according to the first switch state and the second switch state.

[0099] The driving control mentioned here can be understood as the operation of controlling the on or off state of the light emitting device.

[0100] Furthermore, after determining the switching states of the first transistor and the second transistor connected to the short-circuited light-emitting device, the conduction state of the branch where the short-circuited light-emitting device is located is determined, and by controlling the branch where the short-circuited light-emitting device is located to be in a short-circuited state, it is ensured that when the row driving unit scans other row data lines, other light-emitting devices display normally, thereby avoiding the phenomenon that the short-circuited light-emitting device causes other light-emitting devices to emit abnormal light.

[0101] The pixel driving method provided by the embodiment of the present application scans the row data line in row order through the row driving unit, and outputs the output voltage of the corresponding column data line through the column driving unit, determines whether the light-emitting device connected to the current row data line is short-circuited according to the output voltage, and when the light-emitting device is short-circuited, determines the first switch state of the first transistor, and determines the second switch state of the second transistor; and performs driving control on the pixel unit according to the first switch state and the second switch state. When a short-circuited light-emitting device occurs, the added transistor is used to block the conduction of the branch where the short-circuited light-emitting device is located, thereby avoiding abnormal display due to pixel short-circuit, and achieving the technical effect of improving the screen display quality.

[0102] Figure 6 A schematic flow chart of another pixel driving method provided in an embodiment of the present application, which is applied in a pixel driving module. Figure 6 This is introduced based on the previous embodiment. Figure 5 The pixel driving method specifically includes:

[0103] S601 , scan row data lines in row order through a row driving unit, and output output voltages corresponding to column data lines through a column driving unit.

[0104] S602: When the output voltage of the target column data line is at a low level, determine that the branch where the light-emitting device between the target column data line and the current row data line is located is not short-circuited.

[0105] S603: When the output voltage of the target column data line is at a high level, it is determined that a short circuit occurs in a branch where the light emitting device between the target column data line and the current row data line is located.

[0106] The present application is applied to the process of controlling the display abnormality of other pixels caused by a short circuit of a light-emitting device during the pixel driving process. By adding two transistors with opposite functions at both ends of the light-emitting device, when a short circuit occurs in the light-emitting device, the transistor of the branch where the light-emitting device is located is controlled to be in an off state so that the branch where the light-emitting device is located remains in an off state, thereby avoiding a short circuit between the row data line and the column data line, which affects the brightness of the light-emitting devices of other light-emitting devices, and achieving the technical effect of avoiding abnormal display caused by a short circuit of a pixel, thereby improving the display quality of the screen.

[0107] The row driving unit mentioned here controls the driving of the row data line, and the column driving unit controls the output of the column data line.

[0108] Furthermore, after the display screen is turned on, bad pixel detection is turned on, and detection is performed row by row starting from the first row. During each row detection scan, the OUT channel where the column data line is located will be turned on, and the voltage of the corresponding light-emitting device will be output. When a low-level signal is detected on the column data line, it indicates that the light-emitting device connected to the data line of the current scan row can be lit normally and no short circuit occurs; when the output voltage on the column data line is detected as a high-level signal, it indicates that no current flows through the two ends of the light-emitting device, and then it is determined that a short circuit occurs in the branch where the light-emitting device is located.

[0109] S604, when the first transistor is a first PMOS transistor and the second transistor is a first NMOS transistor, obtain a first target voltage output by the current row data line, and obtain a second target voltage of the column data line connected to the branch where the light-emitting device is located.

[0110] S605. When a short circuit occurs in the light emitting device, determine that the first target voltage is at a high level, and the second target voltage is at a high level.

[0111] S606 , determining that the first switch state of the first PMOS tube is a first off state according to the first target voltage.

[0112] S607 , determining that the second switch state of the first NMOS transistor is the first conduction state according to the second target voltage.

[0113] Furthermore, according to the different switching logics of the PMOS tube and the NMOS tube, the same control can be obtained by selecting different transistors. When the scan is turned off on the row data line, when the row data line is at a high level, since the transistor connected to the row data line is a PMOS tube, then since the gate is at a high level, in order to achieve the on-voltage of the PMOS tube, the PMOS tube is controlled to be in an off state when the first target voltage is at a high level. At the same time, when a short circuit occurs in the light-emitting device, the output voltage on the column line is always kept at a high level output, so that the high-level second target voltage controls the NMOS tube connected to the column data line to turn on, and then the second switch state is obtained as an on state. The branch where the short-circuited light-emitting device is located is in an off state.

[0114] S608, when the first transistor is a second NMOS transistor and the second transistor is a second PMOS transistor, obtain a third target voltage output by the current row data line, and obtain a fourth target voltage corresponding to the column data line connected to the branch where the light-emitting device is located.

[0115] S609: When a short circuit occurs in the light emitting device, determine that the third target voltage is at a high level, and the fourth target voltage is at a high level.

[0116] S610: Determine, according to a third target voltage, that the first switch state of the second NMOS transistor is a second conduction state.

[0117] S611. Determine, according to a fourth target voltage, that the second switch state of the second PMOS tube is a second off state.

[0118] Furthermore, according to the different switching logics of the PMOS tube and the NMOS tube, the same control can be obtained by selecting different transistors. When the scan is turned off on the row data line, when the row data line that ends the scan outputs a high level, since the transistor connected to the row data line is an NMOS tube, since the gate is at a high level, in order to reach the conduction voltage of the NMOS tube, the NMOS tube is controlled to be in a conduction state when the third target voltage is at a high level. At the same time, when the light-emitting device is short-circuited, the output voltage on the column line is always kept at a high level output, so that the high-level fourth target voltage controls the PMOS tube connected to the column data line to conduct, and then the fourth switch state is obtained as the off state, and the branch where the current light-emitting device is located is obtained as the disconnected state.

[0119] S612, when the first switch state is the first off state and the second switch state is the first on state, control the pixel unit where the short-circuited light-emitting device is located to remain in an off state so that the short-circuited light-emitting device does not affect the display of other light-emitting devices.

[0120] Furthermore, when the first transistor is a PMOS tube and the second transistor is an NMOS tube, when a light-emitting device is short-circuited, the branch where the short-circuited light-emitting device is located is in a disconnected state regardless of before or after scanning, so that the row data line will not be short-circuited with the column data line, and the output voltage and display abnormality of other light-emitting devices will not be affected, thereby avoiding display abnormality caused by pixel short circuit, and achieving the technical effect of improving the screen display quality.

[0121] S613, when the first switch state is the second on state and the second switch state is the second off state, control the pixel unit where the short-circuited light-emitting device is located to remain in an off state so that the short-circuited light-emitting device does not affect the display of other light-emitting devices.

[0122] Furthermore, when the first transistor is an NMOS tube and the second transistor is a PMOS tube, when a light-emitting device is short-circuited, the branch where the short-circuited light-emitting device is located is in a disconnected state regardless of before or after scanning, so that the row data line will not be short-circuited with the column data line, and the output voltage and display abnormality of other light-emitting devices will not be affected, thereby avoiding display abnormality caused by pixel short circuit, and achieving the technical effect of improving the screen display quality.

[0123] Optionally, when both the first transistor and the second transistor are PMOS transistors, or when both the first transistor and the second transistor are PMOS transistors, if the branch where the short-circuited light-emitting device is located can be in a short-circuited state, the same technical effect can be obtained, which also falls within the scope of technical protection of this application. These situations will not be described in detail here.

[0124] Figure 7 A liquid crystal display panel 1000 provided in an embodiment of the present application includes: Figure 2-4 Any of the above-mentioned pixel driving modules 100.

[0125] The liquid crystal display panel 1000 provided in this embodiment may be as follows Figure 7 The liquid crystal display panel 1000 shown in FIG. 1 may perform the following steps: Figure 5-6 All steps of the pixel driving method in the Figure 5-6 For details on the technical effects of the pixel driving method shown, please refer to Figure 5-6 For the sake of brevity, the relevant description is not repeated here.

[0126] Figure 8 A display device 10000 provided in an embodiment of the present application includes: Figure 7 A liquid crystal display panel 1000 is provided.

[0127] The display device 10000 provided in this embodiment may be as follows Figure 8 The display device 1000 shown in FIG. 1 may perform the following steps: Figure 5-6 All steps of the pixel driving method in the Figure 5-6 For details on the technical effects of the pixel driving method shown, please refer to Figure 5-6 For the sake of brevity, the relevant description is not repeated here.

[0128] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the present application in detail. It should be understood that the above description is only the specific implementation method of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A pixel driving module for driving a display panel, characterized in that: include: A row driving unit, a column driving unit and a pixel matrix, wherein the pixel matrix is ​​composed of a plurality of pixel units, each of the pixel units comprises a first transistor, a second transistor and a light emitting device, wherein the first transistor and the second transistor are transistors of different types; The row driving unit is connected to a plurality of row data lines arranged in parallel, the row data lines are used to output row scanning signals, the column driving unit is connected to a plurality of column data lines arranged in parallel, the column data lines are used to output pixel signals, and the row data lines are in a perpendicular relationship to the column data lines; A target pixel unit is arranged in a rectangular area formed between two adjacent row data lines and two adjacent column data lines, the control end and the first end of the first transistor in the target pixel unit are respectively connected to the column data line where the right boundary of the rectangular area is located, the second end of the first transistor is connected to the first end of the light-emitting device, the second end of the light-emitting device is connected to the second end of the second transistor in the target pixel unit, and the control end and the first end of the second transistor are respectively connected to the row data line where the upper boundary of the rectangular area is located.

2. The module according to claim 1, characterized in that: The first transistor is a first PMOS transistor, the second transistor is a first NMOS transistor, and the light emitting device is a first light emitting diode; The gate and drain of the first PMOS tube are respectively connected to the column data line at the right boundary of the rectangular area, and the source of the first PMOS tube is connected to the reverse output end of the first light-emitting diode; The forward input terminal of the first light emitting diode is connected to the source of the first NMOS tube; The gate and drain of the first NMOS tube are respectively connected to the row data line where the upper boundary of the rectangular area is located.

3. The module according to claim 1, characterized in that: The first transistor is a second NMOS transistor, the second transistor is a second PMOS transistor, and the light emitting device is a second light emitting diode; The gate and drain of the second NMOS tube are respectively connected to the column data line where the right boundary of the rectangular area is located, and the source of the second NMOS tube is connected to the positive input terminal of the second light-emitting diode; The reverse output end of the second light emitting diode is connected to the source of the second PMOS tube; The gate and drain of the second PMOS tube are respectively connected to the row data line where the upper boundary of the rectangular area is located.

4. A pixel driving method, applied to the pixel driving module as claimed in any one of claims 1 to 3, characterized in that: include: Scanning the row data lines in row order through the row driving unit, and outputting the output voltages corresponding to the column data lines through the column driving unit; Determine whether the light emitting device currently connected to the row data line is short-circuited according to the output voltage; When the light emitting device is short-circuited, determining a first switching state of the first transistor, and determining a second switching state of the second transistor; The pixel unit is driven and controlled according to the first switch state and the second switch state.

5. The method according to claim 4, characterized in that The step of determining whether a light emitting device currently connected to the row data line is short-circuited according to the output voltage comprises: When the output voltage output by the target column data line is at a low level, determining that a branch where the light emitting device between the target column data line and the current row data line is located is not short-circuited; When the output voltage output by the target column data line is at a high level, it is determined that a short circuit occurs in a branch where the light emitting device between the target column data line and the current row data line is located.

6. The method according to claim 5, characterized in that When the light emitting device is short-circuited, determining a first switching state of the first transistor and determining a second switching state of the second transistor comprises: When the first transistor is a first PMOS transistor and the second transistor is a first NMOS transistor, obtaining a first target voltage output by a current row data line, and obtaining a second target voltage of a column data line connected to a branch where the light-emitting device is located; When the light emitting device is short-circuited, determining that the first target voltage is at a high level and the second target voltage is at a high level; Determining, according to the first target voltage, that the first switch state of the first PMOS tube is a first off state; The second switch state of the first NMOS tube is determined to be a first conduction state according to the second target voltage.

7. The method according to claim 5, characterized in that When the light emitting device is short-circuited, determining a first switching state of the first transistor and determining a second switching state of the second transistor comprises: When the first transistor is a second NMOS transistor and the second transistor is a second PMOS transistor, a third target voltage output by the current row data line is obtained, and a fourth target voltage corresponding to the column data line connected to the branch where the light-emitting device is located is obtained; When the light emitting device is short-circuited, determining that the third target voltage is at a high level, and the fourth target voltage is at a high level; Determine, according to the third target voltage, that the first switch state of the second NMOS tube is a second conduction state; The second switch state of the second PMOS tube is determined to be a second off state according to the fourth target voltage.

8. The method according to claim 6 or 7, characterized in that: The performing drive control on the pixel unit according to the first switch state and the second switch state comprises: When the first switch state is a first off state and the second switch state is a first on state, the pixel unit where the short-circuited light-emitting device is located is controlled to remain in an off state, so that the short-circuited light-emitting device does not affect the display of other light-emitting devices; When the first switch state is the second on state and the second switch state is the second off state, the pixel unit where the short-circuited light-emitting device is located is controlled to remain in an off state so that the short-circuited light-emitting device does not affect the display of other light-emitting devices.

9. A liquid crystal display panel, comprising an array substrate and a color filter substrate arranged in a cell, wherein a liquid crystal layer is arranged between the array substrate and the color filter substrate, wherein: include: The array substrate has a pixel driving module as described in any one of claims 1-3.

10. A display device, characterized in that: include: The housing has a backlight module and a liquid crystal display panel as claimed in claim 9 arranged inside the housing.

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