CN115985252B - Organic light emitting diode display panel, driving method thereof and display device - Google Patents
Organic light emitting diode display panel, driving method thereof and display device Download PDFInfo
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Abstract
The application discloses an organic light emitting diode display panel, a driving method thereof and a display device, and relates to the technical field of display. A resistor is additionally arranged in at least part of the pixel structure, and a corresponding data line transmits a data signal to a control end of the driving tube through the resistor; in the pixel structures of two adjacent rows, the difference value between the power supply voltage of the power supply line received by the receiving end of the driving tube corresponding to the pixel structure of the current row and the power supply voltage of the power supply line received by the receiving end of the driving tube corresponding to the pixel structure of the next row is equal to the difference value between the data voltage of the data line received by the control end of the driving tube corresponding to the pixel structure of the current row and the data voltage of the data line received by the control end of the driving tube corresponding to the pixel structure of the next row. Through the design, the difference value of the power supply voltage and the data voltage in the pixel structures of different rows is equal, so that the driving currents of the pixel structures of different rows are controlled to be the same, and the uniformity of the light emitting of the panel is improved.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to an organic light emitting diode display panel, a driving method thereof, and a display device.
Background
With the progress of the times and technologies, large-sized and high-resolution Organic Light Emitting Diode (OLED) display devices are gradually developed, and correspondingly, large-sized OLED display devices also need larger-sized display panels and larger numbers of pixels, the length of power lines is longer and longer, and the resistance of wires is larger. Inevitably, the power supply voltage will be attenuated on the power supply line, and the resistance value of the power supply line makes the power supply voltage obtained by each row of pixel structures different, so that under the same data signal voltage input, different pixel structures have different currents and brightness outputs, and the display brightness of the whole display panel is uneven, and the picture display effect is affected.
Disclosure of Invention
The invention provides an organic light emitting diode display panel capable of making display brightness uniform, a driving method thereof and a display device.
The application discloses an organic light-emitting diode display panel, which comprises a plurality of data lines, a plurality of scanning lines, a plurality of power lines and a plurality of pixel structures surrounded by the data lines and the scanning lines, wherein a light-emitting unit and a driving unit are arranged in each pixel structure, the driving unit comprises a switching tube, a driving tube and a capacitor, the control end of the switching tube is connected with the scanning lines, the receiving end of the switching tube is connected with the data lines, the output end of the switching tube is connected with the control end of the driving tube, the receiving end of the driving tube is connected with the power lines, the output end of the driving tube is connected with the light-emitting unit, one end of the capacitor is connected with the output end of the switching tube, and the other end of the capacitor is connected with the receiving end of the driving tube; at least part of the pixel structures are also provided with resistors, and the corresponding data lines transmit data signals to the control end of the driving tube through the resistors; in the pixel structures of two adjacent rows, the difference value between the power supply voltage of the power supply line received by the receiving end of the driving tube corresponding to the pixel structure of the current row and the power supply voltage of the power supply line received by the receiving end of the driving tube corresponding to the pixel structure of the next row is equal to the difference value between the data voltage of the data line received by the control end of the driving tube corresponding to the pixel structure of the current row and the data voltage of the data line received by the control end of the driving tube corresponding to the pixel structure of the next row.
Optionally, each data line is divided into a plurality of line segments, two adjacent line segments are connected through the resistor, and the resistor in each pixel structure is arranged between the corresponding scanning line and the connecting end of the switching tube and the data line in the pixel structure in the previous row.
Optionally, the resistor is formed by a metal wire, and the length of the metal wire is larger than the interval between the data wires at two ends of the resistor.
Optionally, the metal line and the data line are arranged on the same layer, and are formed through a synchronous process.
Optionally, the metal lines and the data lines are arranged in different layers, and the connection end of the switch tube and the data lines in the pixel structure of the previous row and the data line part between the previous row of scanning lines are overlapped with the metal lines.
Optionally, in the pixel structure including the resistors, the resistance values of the resistors are all equal.
Optionally, a row of pixel structures closest to the input end of the power line is a first row of pixel structures, and the resistors are disposed in the rest of the pixel structures except the first row of pixel structures in the organic light emitting diode display panel.
Optionally, the switching tube and the driving tube are P-type MOS tubes.
The application also discloses a driving method of the organic light emitting diode display panel, which is used for driving the organic light emitting diode display panel, and comprises the following steps:
judging whether the current row of pixel structures belongs to a first row of pixel structures, if so, receiving an original data voltage generated by an original data signal by a control end of a driving tube in the first row of pixel structures, and receiving a power supply voltage of a power supply line by an input end of the driving tube in the first row of pixel structures; if not, the control end of the driving tube of the corresponding pixel structure receives the data compensation voltage generated according to the original data voltage, and the input end of the driving tube receives the secondary power supply voltage;
the pixel structure is provided with a resistor, the original data voltage forms a data compensation voltage through the resistor, and the difference value between the original data voltage and the data compensation voltage is equal to the difference value between the power supply voltage and the secondary power supply voltage.
The application also discloses a display device comprising the organic light emitting diode display panel and a driving circuit for driving the organic light emitting diode display panel.
According to the display device, the resistors in the pixel structures are utilized, the voltage drop of the data voltage is synchronously carried out along with the voltage drop of the power supply voltage, so that the difference value between the power supply voltage and the data voltage in the pixel structures in different rows is equal, the driving currents of the pixel structures in different rows are controlled to be the same, the light emitting diodes in the pixel structures in different rows can emit light with the same brightness when the picture with the same brightness is displayed, the uniformity of the light emitting of the panel is improved, and the problem that the display brightness is uneven due to the fact that the power supply voltage is damaged by the impedance of the power supply line is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive faculty for a person skilled in the art. In the drawings:
fig. 1 is a schematic diagram of a display device according to an embodiment of the present application;
fig. 2 is a schematic diagram of an organic light emitting diode display panel according to an embodiment of the present application;
fig. 3 is a schematic diagram of a first implementation of an organic light emitting diode display panel according to an embodiment of the present application;
fig. 4 is a schematic diagram of a second implementation of an organic light emitting diode display panel according to an embodiment of the present application;
fig. 5 is a flowchart of a driving method of an organic light emitting diode display panel according to an embodiment of the present application.
10, a display device; 20. an organic light emitting diode display panel; 30. a driving circuit; 100. a pixel structure; 110. a driving unit; 120. a resistor; vdd, power supply line; data, data lines; scan, scan line; t1, a switching tube; t2, a driving tube; C. a capacitor; r, equivalent resistance.
Detailed Description
It is to be understood that the terminology used herein, the specific structural and functional details disclosed, 5, are merely representative for the purpose of describing particular embodiments, but that the application may be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.
The present application is described in detail below with reference to the attached drawings and alternative embodiments.
Because the impedance exists in the power line of the organic light emitting diode display panel, the power voltage gradually decreases along with the transmission of the power voltage in the power line, so that the power voltage received by the pixel structure at the rear part of the organic light emitting diode display panel is smaller than the power voltage received by the pixel structure at the front part of the organic light emitting diode display panel, when the organic light emitting diode display panel needs to display pictures with the same brightness, the brightness displayed by the pixel structure at the rear part of the organic light emitting diode display panel is obviously reduced, the problem of uneven display brightness is generated, and the picture display effect is affected. Based on
In this regard, the embodiments of the present application provide an organic light emitting diode display panel, a display device, and a 5 driving method such that display luminance in the organic light emitting diode display panel is uniform.
As shown in fig. 1, the present application discloses a display device 10 including an organic light emitting diode display panel 20, and a driving circuit 30 driving the organic light emitting diode display panel 20.
As shown in fig. 2, the present application further discloses an organic light emitting diode display panel, wherein the 0 th organic light emitting diode display panel 20 may be used in the display device 10 described above, the organic light emitting diode display panel 20 includes a plurality of Data lines Data, a plurality of Scan lines Scan, a plurality of power lines Vdd, and a plurality of pixel structures 100 surrounded by the plurality of Data lines Data and the plurality of Scan lines Scan, each pixel structure 100 is provided with a light emitting unit and a driving unit 110, the light emitting units are LED lamps, the driving units 110 are 2T1C structures, and specifically include a switching tube T1, a driving tube T2 and a capacitor C, a control end of the switching tube T1 is connected with the Scan lines Scan, a receiving end of the switching tube T1 is connected with the Data lines Data, an output end of the switching tube T1 is connected with a control end of the driving tube T2, a receiving end of the driving tube T2 is connected with the power lines, an output end of the driving tube T2 is connected with the output end of the switching tube T1, and another end of the driving tube T2 is connected with the receiving end of the switching tube T2.
A resistor 120 is further disposed in at least a portion of the pixel structure 100, and the corresponding Data line Data transmits a Data signal to the control end of the driving tube T2 through the resistor 120; in the two adjacent rows of pixel structures 100, a difference value between a power supply voltage of the power supply line Vdd received by the receiving end of the driving tube T2 corresponding to the current row of pixel structures 100 and a power supply voltage of the power supply line Vdd received by the receiving end of the driving tube T2 corresponding to the next row of pixel structures 100 is equal to a difference value between a Data voltage of the Data line Data received by the control end of the driving tube T2 corresponding to the current row of pixel structures 100 and a Data voltage of the Data line Data received by the control end of the driving tube T2 corresponding to the next row of pixel structures 100.
In this embodiment of the present application, the switching tube T1 is an addressing transistor, and is also a P-type MOS transistor, and when the scanning signal is a low-level signal, the switching tube T1 is turned on, and the data signal charges the capacitor C through the switching tube T1; when the scanning signal is a high level signal, the switch tube T1 is turned off, and the capacitor C will maintain the charge until the next turn-on of the switch tube T1, because the capacitor C has no discharging path, the charge stored in the capacitor C is directly connected across the two ends of the gate source of the driving tube T2, that is, the data voltage output to the control end of the driving tube T2 and the power voltage output to the input end of the driving tube T2 determine the magnitude of the current flowing through the source drain in the driving tube T2, thereby determining the brightness of the light emitting diode. The driving tube T2 may be a P-type MOS tube or an N-type MOS tube, and when the driving tube T2 is a P-type MOS tube, the driving current of the light emitting diode is increased only when the data voltage at the control end of the driving tube T2 is reduced, so as to ensure uniform brightness.
Since the driving current formula of the light emitting diode is Wherein Ioled is the driving current of the light emitting diode, μ is the mobility of the active layer, cox is the capacitance between the gate and the active layer, C, W is the channel width of the light emitting diode, L is the channel length of the organic light emitting diode, VDD is the power supply voltage, and Vdata is the data voltage. Since the mobility of the active layer, the capacitance C between the gate and the active layer, the channel width and the channel length of each led are the same, and the power supply voltage is subject to the loss of the impedance of the power supply line Vdd (indicated by the equivalent resistance R in the figure), the power supply voltage gradually decreases along with the direction of signal flow in the power supply line Vdd, which results in that the driving current Ioled of the led also gradually decreases, resulting in that the brightness of the led gradually decreases.
Therefore, the voltage drop of the data voltage can be synchronously performed along with the voltage drop of the power supply voltage, so that the difference value between the power supply voltage and the data voltage in the pixel structures 100 of different rows is similar or equal, and the driving currents of the pixel structures 100 of different rows are controlled to be similar or identical, so that the light emitting diodes of the pixel structures 100 of different rows can emit light with the same brightness when the picture with the same brightness is displayed, and the uniformity of the light emitting of the panel is improved. Compared with the scheme that the display brightness is not uniform due to the fact that the power supply voltage is subjected to the loss of the power supply line Vdd impedance by increasing the data voltage, increasing the driving time and other modes, the resistor 120 is only additionally arranged in the pixel structure 100, the data voltage is consumed by the resistor 120, the difference between the power supply voltage received by the driving tube T2 in the pixel structure 100 in the current row and the power supply voltage received by the driving tube T2 in the pixel structure 100 in the next row is equal to the difference between the data voltage received by the driving tube T2 in the pixel structure 100 in the current row and the data voltage received by the driving tube T2 in the pixel structure 100 in the next row, so that the driving current of the light emitting diode in the pixel structure 100 in the current row and the driving current of the light emitting diode in the pixel structure 100 in the next row are equal, and the problem that the display brightness is not uniform due to the fact that the power supply voltage is subjected to the loss of the power supply line Vdd impedance is solved. In contrast, in this embodiment of the present application, since the loss of the power supply voltage in the power supply line Vdd is easily measured, the resistance of the resistor 120 and the loss of the data voltage by the resistor 120 are also easily controlled, so that the driving currents of the light emitting diodes in the pixel structures 100 of different rows can be accurately controlled to be equal under the condition of conveniently designing the circuit, so that the brightness of the display image is very uniform.
Note that, regarding the distribution of the pixel structures 100 including the resistor 120 on the organic light emitting diode display panel 20 in the embodiment of the present application, when the size of the organic light emitting diode display panel 20 is relatively small, the power supply voltage is relatively small, and the power supply line Vdd resistance is very small, the resistor 120 may be set as required, for example, the resistor 120 may be added only to the pixel structure 100 on the side of the organic light emitting diode display panel 20 far from the output end of the power supply line Vdd, or the resistor 120 may be added only to the pixel structure 100 in the middle area of the organic light emitting diode display panel 20, or the resistor 120 may be added to the pixel structure 100 in one row or multiple rows of the organic light emitting diode display panel 20 at intervals, and at this time, even if the resistor 120 is not set in any pixel structure 100, the power supply voltage and the data voltage are very similar in loss degree, and may be ignored.
Preferably, the present application uses a row of the pixel structures 100 closest to the input end of the power line Vdd as a first row of the pixel structures 100, and the resistors 120 are disposed in the remaining pixel structures 100 except for the first row of the pixel structures 100 in the organic light emitting diode display panel 20. Since the first row of pixel structures 100 is close to the output end of the power line Vdd, the power consumption of the small section of power line Vdd is negligible, so that the first row of pixel structures 100 does not need to be provided with a resistor structure, and after the other rows of pixel structures 100 are all additionally provided with resistors 120, the same driving current of each pixel structure 100 in the organic light emitting diode display panel 20 can be ensured, and the uniform brightness effect of the display image can be effectively ensured.
In addition, in the pixel structure 100 including the resistors 120, the resistance values of the resistors 120 are equal, so that each resistor 120 can be of the same specification and model, and independent design of each resistor 120 is not required to be considered, thereby facilitating the overall circuit design; further, in the pixel structure 100 including the resistor 120, the sum of the resistance value of the Data line Data portion and the resistance value of the resistor 120 is also equal, and although the resistance value of the Data line Data is smaller, the uniformity of the display brightness can be further improved in combination.
For the position of the resistor 120 in the pixel structure 100, the resistor 120 may be disposed between the switching tube T1 and the Data line Data, so that one end of the resistor 120 is connected to the Data line Data, and the other end is connected to the receiving end of the switching tube T1; the resistor 120 may also be arranged between the switching tube T1 and the driving tube T2, so that one end of the resistor 120 is connected to the output end of the switching tube T1, and the other end is connected to the control end of the driving tube T2; the resistor 120 may also be formed between the capacitor C and the driving tube T2, such that one end of the resistor 120 is connected to the capacitor C and the other end is connected to the control end of the driving tube T2. In the three-position design of the resistor 120, the resistor 120 is arranged in the driving unit 110, which is convenient for the overall design of the driving circuit 30 and avoids the dispersion of circuit components.
The resistor 120 may be further formed in the Data line Data, where each Data line Data is divided into a plurality of line segments, two adjacent line segments are connected through the resistor 120, and the resistor 120 in each pixel structure 100 is disposed between the corresponding Scan line Scan and the connection end of the switching tube T1 and the Data line Data in the pixel structure 100 in the previous row. By adopting the design mode, firstly, a larger space is provided for facilitating the design of the resistor 120, secondly, the same load condition as the power line Vdd can be formed, and even if the pixel structure 100 is closed or short-circuited, the consumption of the data voltage is not affected, so that the driving current of each pixel structure 100 is not affected.
For the design of resistor 120 in pixel structure 100, the present embodiments provide two specific implementations as follows:
as shown in fig. 3, as a first implementation manner in the embodiment of the present application, the resistor 120 is formed by a metal wire, the length of the metal wire is greater than the interval between the Data lines Data at two ends of the resistor 120, and the resistor 120 formed by the metal wire is increased compared with the Data line Data without adding the resistor 120, which is equivalent to increasing the length of the Data line Data, and further increasing the resistor 120 of the Data line Data. The metal lines may be curved, or may be zigzag, and may extend towards the corresponding pixel structure 100, or may extend towards the adjacent pixel structure 100.
The resistor 120 is formed by adopting a metal wire mode, compared with other types of resistors 120, the resistor has smaller volume, smaller occupied area and better influence on the aperture ratio. In addition, the metal wire and the Data wire are arranged on the same layer and are formed through a synchronous process, so that the manufacture of the metal wire does not occupy additional materials and procedures and does not cause cost increase.
Moreover, when the resistor 120 is formed in the Data line Data, the metal lines have more space for arrangement, so as to avoid the problem of interference or parasitic capacitance.
As shown in fig. 4, as a second embodiment in the example of the present application, unlike the first embodiment, the resistor 120 is formed of a metal wire, but the metal wire is provided in a different layer from the Data line Data, and both ends of the metal wire are connected to the Data line Data through vias; and the connection end of the switch tube T1 and the Data line Data in the pixel structure 100 of the previous row, and the Data line Data portion between the Scan line Scan of the previous row, are also overlapped with the metal line.
In this embodiment, the metal line can serve as a repair line in addition to the resistor 120, so as to achieve the effect of achieving two purposes, and when a bright spot appears on the display screen, the pixel corresponding to the bright spot needs to be turned off, so that the overall display effect is not affected. At this time, the Data line Data connected to the switching tube T1 may be partially disconnected, specifically, may be disconnected by using a laser cutting manner, and a specific cutting position diagram is represented by a dotted line a, so that the pixel area becomes a dark point after cutting; then, the metal line overlapped with the Data line Data and the Data line Data can be connected together in a welding mode, so that the Data line Data is connected newly, and the normal operation of the following pixel structure 100 is not affected; the specific welding position is indicated by the point B. The metal lines and the Scan lines can be formed through a synchronous process, so that the manufacture of the metal lines does not occupy additional materials and processes and does not cause cost increase.
As shown in fig. 5, the embodiment of the present application further discloses a driving method of an organic light emitting diode display panel, which is used for driving the organic light emitting diode display panel 20, and specifically includes the steps of:
judging whether the current row of pixel structures belongs to a first row of pixel structures, if so, receiving an original data voltage generated by an original data signal by a control end of a driving tube in the first row of pixel structures, and receiving a power supply voltage of a power supply line by an input end of the driving tube in the first row of pixel structures; if not, the control end of the driving tube of the corresponding pixel structure receives the data compensation voltage generated according to the original data voltage, and the input end of the driving tube receives the secondary power supply voltage;
the pixel structure is provided with a resistor, the original data voltage forms a data compensation voltage through the resistor, and the difference value between the original data voltage and the data compensation voltage is equal to the difference value between the power supply voltage and the secondary power supply voltage.
It should be noted that, except for the first row of pixel structures, resistors are arranged in the other rows of pixel structures, and corresponding data lines transmit data signals to the control end of the driving tube through the resistors; the data compensation voltage is a negative compensation voltage, and is a voltage obtained by consuming the data voltage through a resistor. The driving current of the pixel structures in different rows is controlled to be the same by controlling the voltage drop of the power supply voltage in the pixel structure to be equal to the voltage drop of the data voltage, so that the uniformity of the light emitting of the panel is improved.
In addition, the inventive concept of the present application may form a very large number of embodiments, but the application documents are limited in size and cannot be listed one by one, so that on the premise of no conflict, the above-described embodiments or technical features can be arbitrarily combined to form new embodiments, and after the embodiments or technical features are combined, the original technical effects will be enhanced.
The foregoing is a further detailed description of the present application in connection with specific alternative embodiments, and it is not intended that the practice of the present application be limited to such descriptions. It should be understood that those skilled in the art to which the present application pertains may make several simple deductions or substitutions without departing from the spirit of the present application, and all such deductions or substitutions should be considered to be within the scope of the present application.
Claims (6)
1. An organic light-emitting diode display panel comprises a plurality of data lines, a plurality of scanning lines, a plurality of power lines, and a plurality of pixel structures surrounded by the data lines and the scanning lines, wherein a light-emitting unit and a driving unit are arranged in each pixel structure, the driving unit comprises a switch tube, a driving tube and a capacitor, a control end of the switch tube is connected with the scanning lines, a receiving end of the switch tube is connected with the data lines, an output end of the switch tube is connected with a control end of the driving tube, a receiving end of the driving tube is connected with the power lines, an output end of the driving tube is connected with the light-emitting unit, one end of the capacitor is connected with an output end of the switch tube, and the other end of the capacitor is connected with a receiving end of the driving tube,
at least part of the pixel structures are also provided with resistors, and the corresponding data lines transmit data signals to the control end of the driving tube through the resistors; in the two adjacent rows of pixel structures, the difference value of the power supply voltage of the power supply line received by the receiving end of the driving tube corresponding to the current row of pixel structure and the power supply voltage of the power supply line received by the receiving end of the driving tube corresponding to the next row of pixel structure is equal to the difference value of the data voltage of the data line received by the control end of the driving tube corresponding to the current row of pixel structure and the data voltage of the data line received by the control end of the driving tube corresponding to the next row of pixel structure;
each data line is divided into a plurality of line segments, two adjacent line segments are connected through the resistor, and the resistor in each pixel structure is arranged between the corresponding scanning line and the connecting end of the switching tube and the data line in the pixel structure of the previous row;
the resistor is formed by metal wires, and the length of the metal wires is larger than the distance between the data wires at the two ends of the resistor;
the metal lines and the data lines are arranged in different layers, and the connection ends of the switching tubes and the data lines in the pixel structure of the upper row are overlapped with the data lines between the scanning lines of the upper row and the metal lines;
when a bright spot appears on a display picture, the part of the data line connected with the switch tube in the corresponding pixel structure is disconnected, and then the metal line overlapped with the data line is connected with the data line in a fusion welding mode, so that the data line is communicated.
2. The organic light emitting diode display panel of claim 1, wherein in the pixel structure including the resistors, the resistances of the resistors are all equal.
3. The organic light emitting diode display panel of claim 1, wherein a row of the pixel structures closest to the input end of the power line is a first row of pixel structures, and the resistors are disposed in the remaining pixel structures except the first row of pixel structures in the organic light emitting diode display panel.
4. The organic light emitting diode display panel of claim 1, wherein the switching tube and the driving tube are P-type MOS tubes.
5. A driving method of an organic light emitting diode display panel for driving the organic light emitting diode display panel according to any one of claims 1 to 4, comprising the steps of:
judging whether the current row of pixel structures belongs to a first row of pixel structures, if so, receiving an original data voltage generated by an original data signal by a control end of a driving tube in the first row of pixel structures, and receiving a power supply voltage of a power supply line by an input end of the driving tube in the first row of pixel structures; if not, the control end of the driving tube of the corresponding pixel structure receives the data compensation voltage generated according to the original data voltage, and the input end of the driving tube receives the secondary power supply voltage;
the pixel structure is provided with a resistor, the original data voltage forms a data compensation voltage through the resistor, and the difference value between the original data voltage and the data compensation voltage is equal to the difference value between the power supply voltage and the secondary power supply voltage.
6. A display device comprising the organic light emitting diode display panel according to any one of claims 1 to 4, and a driving circuit for driving the organic light emitting diode display panel.
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