Display panel, driving method and display device

Abstract

The invention discloses a display panel, a driving method and a display device. The disclosed display panel comprises a driving chip, a driving power supply and a plurality of pixel units, each pixel unit comprises a transistor and a light emitting diode; the driving chip is connected with the control end of each transistor through a scanning line or a data line, and the driving power supply is connected with each light emitting diode through each transistor; and the line width of the data line and / or the scanning line is smaller than that of the transmission line between the driving power supply and the light-emitting diode. The driving chip outputs a PWM scanning control signal to any transistor through a scanning line, or outputs a PWM data control signal to any transistor through a data line; when the transistor receives the PWM scanning control signal or the PWM data control signal, the driving power supply is connected to the light-emitting diode in the same pixel unit, so that the driving power supply drives the light-emitting diode, a large line width does not need to be designed, the stray capacitance of a wire can be reduced, and power consumption waste is avoided.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel, a driving method and a display device. Background Art

[0002] There is a passive matrix (PM) driving scheme for organic light emitting diodes or inorganic light emitting diodes. At present, in the existing PM driving architecture, the driver chip outputs a high-level control signal to the anode of the light emitting diode through the scan line, and outputs a low-level control signal to the cathode of the light emitting diode through the data line, thereby driving the light emitting diode.

[0003] However, in the above-mentioned PM driving architecture, the light-emitting diode is directly driven by the driving chip. In order to output a larger current, it is necessary to design data lines and scan lines with thicker line widths. The thicker line width will cause a larger parasitic capacitance in the routing between the data line and the scan line, resulting in a greater amount of power consumption to overcome the influence of the parasitic capacitance. Summary of the invention

[0004] The main purpose of the present application is to provide a display panel, a driving method and a display device, aiming to solve the technical problem that the line width of the data line and the scanning line in the prior art is relatively thick, resulting in a large parasitic capacitance between the data line and the scanning line, which results in a large amount of power consumption being wasted to overcome the influence of the parasitic capacitance.

[0005] To achieve the above object, the present application provides a display panel, which includes: a driving chip, a driving power supply, and a plurality of pixel units;

[0006] Each of the pixel units comprises: a transistor and a light emitting diode;

[0007] The driving chip is connected to the control end of each transistor through a scan line or a data line, and the driving power supply is connected to each light emitting diode through each transistor;

[0008] Wherein, the line width of the data line and / or the scan line is smaller than the transmission line between the driving power source and the light emitting diode;

[0009] The driving chip is used to output a PWM scanning control signal to any of the transistors through the scanning line, or to output a PWM data control signal to any of the transistors through the data line;

[0010] The transistor is used to connect the driving power supply to the light-emitting diode in the same pixel unit when receiving the PWM scanning control signal or the PWM data control signal, so that the driving power supply drives the light-emitting diode.

[0011] In one embodiment, the driving chip includes: a scan line driving chip and a data line driving chip;

[0012] The scan line driving chip is connected to the control end of each transistor through the scan line, and the data line driving chip is connected to the cathode of each light emitting diode through the data line;

[0013] The scan line driving chip is used to output the PWM scan control signal to the transistor through the scan line;

[0014] The data line driving chip is used to output the PWM data control signal to the cathode of the light emitting diode through the data line;

[0015] The transistor is used to connect the driving power supply to the anode of the light-emitting diode based on the PWM data control signal when the received PWM scanning control signal is in a high level state, so that the driving power supply drives the light-emitting diode.

[0016] In one embodiment, the driving power supply at least includes a positive driving power supply;

[0017] The positive driving power supply is connected to the input terminal of each of the transistors;

[0018] In the same pixel unit, the output end of the transistor is connected to the anode of the light emitting diode;

[0019] The transistor is used to connect the positive driving power supply to the anode of the light-emitting diode when the received PWM scanning control signal is in a high level state and the PWM data control signal output by the data line driving chip to the cathode of the light-emitting diode is in a low level state, so that the positive driving power supply drives the light-emitting diode.

[0020] In one embodiment, the driving chip includes: a scan line driving chip and a data line driving chip;

[0021] The data line driving chip is connected to the control end of each transistor through the data line, and the scan line driving chip is connected to the anode of each light emitting diode through the scan line;

[0022] The data line driving chip is used to output the PWM data control signal to the transistor through the data line;

[0023] The scan line driving chip is used to output the PWM scan control signal to the anode of the light emitting diode through the scan line;

[0024] The transistor is used to connect the driving power supply to the cathode of the light-emitting diode based on the PWM scan control signal when receiving the PWM data control signal, so that the driving power supply drives the light-emitting diode.

[0025] In one embodiment, the driving power supply further includes a negative driving power supply;

[0026] The negative driving power supply is connected to the output end of each of the transistors;

[0027] In the same pixel unit, the input terminal of the transistor is connected to the cathode of the light emitting diode;

[0028] The transistor is used to connect the negative driving power supply to the cathode of the light-emitting diode when the received PWM data control signal is in a low level state and the PWM scanning control signal output by the scanning line driving chip to the anode of the light-emitting diode is in a high level state, so that the negative driving power supply drives the light-emitting diode.

[0029] In one embodiment, the driving chip includes: a scan line driving chip and a data line driving chip;

[0030] Each of the pixel units is provided with a switch unit, and the switch unit includes a plurality of transistors;

[0031] The scan line driving chip is connected to the first control end of each of the switch units through the scan line, the data line driving chip is connected to the second control end of each of the switch units through the data line, and the driving power supply is connected to the light emitting diode through the switch unit;

[0032] The scan line driving chip is used to output the PWM scan control signal to the switch unit through the scan line;

[0033] The data line driving chip is used to output the PWM data control signal to the switch unit through the data line;

[0034] The switch unit is used to connect the driving power supply to the light emitting diode through the PWM scanning control signal and the PWM data control signal, so that the driving power supply drives the light emitting diode.

[0035] In one embodiment, the driving power source includes: a positive driving power source and a negative driving power source;

[0036] The positive driving power supply is connected to the anode of each light emitting diode through each switch unit;

[0037] The negative driving power supply is connected to the cathode of each of the light emitting diodes;

[0038] The switch unit is used to connect the positive driving power supply to the anode of the light emitting diode through the PWM scanning control signal and the PWM data control signal;

[0039] The negative driving power supply is used to drive the light emitting diode when the anode of the light emitting diode is connected to the positive driving power supply.

[0040] In one embodiment, the switch unit in each of the pixel units includes: a first transistor and a second transistor;

[0041] In the same pixel unit, the control end of the first transistor is connected to the scan line driver chip through the scan line, the control end of the second transistor is connected to the data line driver chip through the data line, the input end of the first transistor is connected to the positive driving power supply, the output end of the first transistor is connected to the input end of the second transistor, and the output end of the second transistor is connected to the anode of the light emitting diode;

[0042] The first transistor is used to close when the PWM scanning control signal is in a high level state, and connect the positive driving power supply to the second transistor;

[0043] The second transistor is used to close when the PWM data control signal is in a low level state, so as to connect the connected positive driving power supply to the anode of the light emitting diode.

[0044] In addition, to achieve the above-mentioned purpose, the present application also proposes a driving method based on the display panel described above, the driving method comprising:

[0045] The transistor in any pixel unit is controlled to be closed through the PWM scanning control signal output by the scanning line or the PWM data control signal output by the data line, so that the driving power source is connected to the light emitting diode to drive the light emitting diode.

[0046] In addition, to achieve the above objectives, the present application also proposes a display device, which includes the display panel described above.

[0047] One or more technical solutions proposed in this application have at least the following technical effects:

[0048] The display panel disclosed in the present application includes: a driving chip, a driving power supply and a plurality of pixel units; each pixel unit includes: a transistor and a light-emitting diode; the driving chip is connected to the control end of each transistor through a scanning line or a data line, and the driving power supply is connected to each light-emitting diode through each transistor; the line width of the data line and / or the scanning line is smaller than the transmission line between the driving power supply and the light-emitting diode. The driving chip of the present application outputs a PWM scanning control signal to any transistor through a scanning line, or outputs a PWM data control signal to any transistor through a data line; when the transistor receives the PWM scanning control signal or the PWM data control signal, the driving power supply is connected to the light-emitting diode in the same pixel unit, so that the driving power supply drives the light-emitting diode. Since the light-emitting diode of the present application is driven by the driving power supply, and the driving chip is only used to drive the transistor, and the line width of at least one of the data line and the scanning line is smaller than the transmission line between the driving power supply and the light-emitting diode, there is no need to design a thicker line width, and the driving power supply can output a larger current, thereby effectively reducing the parasitic capacitance of the wiring between the data line and the scanning line, avoiding wasting more power consumption to overcome the influence of the parasitic capacitance, and thus effectively reducing the overall power consumption of the driving architecture. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] 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.

[0050] 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 work.

[0051] Figure 1 It is a schematic diagram of the existing PM drive architecture;

[0052] Figure 2 This is a schematic structural diagram of a first embodiment of a display panel of the present application;

[0053] Figure 3 This is a schematic structural diagram of a second embodiment of a display panel of the present application;

[0054] Figure 4 This is a driving timing diagram of the second embodiment of the display panel of the present application;

[0055] Figure 5 This is a schematic structural diagram of a third embodiment of a display panel of the present application;

[0056] Figure 6 This is a schematic structural diagram of a fourth embodiment of a display panel of the present application;

[0057] Figure 7 Schematic diagram of the specific structure of the switch unit in the fourth embodiment of the display panel of the present application.

[0058] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0059] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0060] In order to better understand the technical solution of the present application, the following will be described in detail with reference to the accompanying drawings in the specification and the implementation method of hyperemesis.

[0061] The main solution of the embodiment of the present application is: in addition to the driving chip and the pixel unit, the display panel is also provided with a driving power supply, and a transistor is provided in the pixel unit; the driving chip is connected to the control end of each transistor through a scanning line or a data line, and the driving power supply is connected to each light-emitting diode through each transistor. The driving chip outputs a PWM scanning control signal to any transistor through a scanning line, or outputs a PWM data control signal to any transistor through a data line; when the transistor receives the PWM scanning control signal or the PWM data control signal, the driving power supply is connected to the light-emitting diode in the same pixel unit, so that the driving power supply drives the light-emitting diode.

[0062] like Figure 1 As shown, Figure 1 Schematic diagram of the existing PM drive architecture. Figure 1 In the embodiment, the driver chip outputs a high-level control signal to the anode of the light-emitting diode D1 in each pixel unit through the scanning lines Gn, Gn+1, Gn+2, Gn+3, etc., and the driver chip outputs a low-level control signal to the cathode of the light-emitting diode D1 in each pixel unit through the scanning lines Sn, Sn+1, Sn+2, etc., so as to turn on the light-emitting diode D1 in each pixel unit and drive each light-emitting diode D1. However, in the above-mentioned PM driving architecture, the driver chip not only performs timing control, but also directly serves as a power source for driving the light-emitting diode D1. In order to output a larger current, it is necessary to design data lines and scanning lines with thicker line widths to withstand the higher output power of the driver chip. The thicker line width will cause a larger parasitic capacitance to exist in the routing between the data line and the scanning line. The parasitic capacitance will be continuously charged and discharged, resulting in attenuation of the signal during transmission. In order to ensure the integrity of the signal, the PM driving architecture needs to provide more energy to compensate for this attenuation, so it will result in the need to waste more power to overcome the influence of the parasitic capacitance.

[0063] The present application provides a solution, in which the light-emitting diode is driven by a driving power supply, and the driving chip is only used to drive the transistor, and the line width of at least one of the data line and the scanning line is smaller than the transmission line between the driving power supply and the light-emitting diode. Therefore, there is no need to design a thicker line width, and the driving power supply can output a larger current, thereby effectively reducing the parasitic capacitance of the wiring between the data line and the scanning line, avoiding the waste of more power consumption to overcome the influence of the parasitic capacitance, and effectively reducing the overall power consumption of the driving architecture.

[0064] Based on this, an embodiment of the present application provides a display panel, referring to Figure 2 , Figure 2 It is a structural schematic diagram of the first embodiment of the display panel of the present application.

[0065] In this embodiment, the display panel includes: a driving chip 100, a driving power source E and a plurality of pixel units.

[0066] Each of the pixel units includes a transistor T0 and a light emitting diode D1.

[0067] It should be noted that the above pixel unit may be a grid formed by the intersection of mutually perpendicular scanning lines and data lines. Figure 1 As shown, the scanning lines Gn and Gn+1 intersect with the data lines Sn and Sn+1, and the grid area surrounded by the four intersections can form a pixel unit.

[0068] Understandably, Figure 1 Although only one pixel unit is shown, this does not limit the present solution. The internal structures of other pixel units are consistent, and all include a transistor T0 and a light-emitting diode D1 , which will not be described in detail in this embodiment.

[0069] The driving chip 100 is connected to the control end of each transistor through a scan line or a data line, and the driving power source E is connected to each light emitting diode D1 through each transistor T0.

[0070] The line width of the data line and / or the scan line is smaller than the transmission line between the driving power source E and the light emitting diode D1. That is, the line width of at least one of the data line and the scan line is smaller than the transmission line between the driving power source E and the light emitting diode D1.

[0071] It should be noted that the transistor T0 may be a switch device, such as a MOS tube, that controls whether current flows through the light emitting diode D1.

[0072] It can be understood that the above-mentioned driving chip 100 can be connected to each scanning line such as scanning line Gn, scanning line Gn+1, and connected to the control end of transistor T0 through the scanning line, or the driving chip 100 is connected to each data line such as data line Sn, data line Sn+1, and connected to the control end of transistor T0 through the data line. This embodiment does not limit this.

[0073] also, Figure 1 The figure shows that the transistor T0 is connected to the anode of the light-emitting diode D1, but in actual application, the positions of the transistor T0 and the light-emitting diode D1 can be switched, that is, the transistor T0 can be connected to the cathode of the light-emitting diode D1, which is not limited in this embodiment.

[0074] It should be noted that in this embodiment and the following embodiments, n in the scanning lines such as the scanning line Gn, the scanning line Gn+1, and the data lines such as the data line Sn, the data line Sn+1, etc., is 1, 2, 3, ... . . . .

[0075] The driving chip 100 is used to output a PWM scanning control signal to any one of the transistors T0 through the scanning line, or to output a PWM data control signal to any one of the transistors T0 through the data line.

[0076] It should be noted that the above-mentioned pulse width modulation (PWM) scanning control signal or PWM data control signal can be a PWM signal for controlling the closing and opening of transistor T0. The time ratio of the high level state and the low level state of the PWM scanning control signal or PWM data control signal in a fixed period can be adjusted, so as to control the on-time of the transistor.

[0077] In a specific implementation, when the driver chip 100 is connected to the transistor T0 in each pixel unit through each scan line, it can output a PWM scan control signal to each transistor T0 through each scan line. When the driver chip 100 is connected to the transistor T0 in each pixel unit through each data line, it can output a PWM data control signal to each transistor T0 through each data line.

[0078] The transistor T0 is used to connect the driving power source E to the light emitting diode D1 in the same pixel unit when receiving the PWM scanning control signal or the PWM data control signal, so that the driving power source E drives the light emitting diode D1.

[0079] In a specific implementation, when the transistor T0 receives the PWM scan control signal or the PWM data control signal, it can be closed according to the high or low level state in the PWM scan control signal or the PWM data control signal. For example, when the transistor T0 is an NMOS tube, it can be closed when the signal is in a high level state, and when the transistor T0 is a PMOS tube, it can be closed when the signal is in a low level state. After the transistor T0 is closed, the drive circuit between the driving power supply E and the light-emitting diode D1 can be turned on, and the driving power supply E is connected to the light-emitting diode D1, and the driving power supply E drives the light-emitting diode D1, so that the driving chip 100 only outputs the PWM scan control signal or the PWM data control signal for timing control, and does not drive the light-emitting diode D1.

[0080] The display panel disclosed in this embodiment includes: a driving chip, a driving power supply and a plurality of pixel units; each pixel unit includes: a transistor and a light emitting diode; the driving chip is connected to the control end of each transistor through a scan line or a data line, and the driving power supply is connected to each light emitting diode through each transistor; the line width of the data line or the scanning line is smaller than the transmission line between the driving power supply and the light emitting diode. The driving chip of this embodiment outputs a PWM scanning control signal to any transistor through a scanning line, or outputs a PWM data control signal to any transistor through a data line; when the transistor receives the PWM scanning control signal or the PWM data control signal, the driving power supply is connected to the light emitting diode in the same pixel unit, so that the driving power supply drives the light emitting diode. Since the light emitting diode in this embodiment is driven by the driving power supply, and the driving chip is only used to drive the transistor, and the line width of the data line or the scanning line is smaller than the transmission line between the driving power supply and the light emitting diode, there is no need to design a thicker line width, and the driving power supply can output a larger current, thereby effectively reducing the parasitic capacitance of the wiring between the data line and the scanning line, avoiding wasting more power consumption to overcome the influence of the parasitic capacitance, and thus effectively reducing the overall power consumption of the driving architecture.

[0081] Based on the first embodiment of the present application, the second embodiment of the present application is proposed. In the second embodiment of the present application, the same or similar contents as those of the first embodiment can be referred to the above introduction, and will not be repeated later. Figure 3 , Figure 3 It is a structural schematic diagram of the second embodiment of the display panel of the present application.

[0082] In this embodiment, the driving chip includes: a scan line driving chip 101 and a data line driving chip 102 .

[0083] It should be noted that the scan line driver chip 101 is a chip connected to the scan lines Gn, Gn+1, Gn+2, Gn+3, Gn+4, etc., and the data line driver chip 102 is a chip connected to the data lines Sn, Sn+1, Sn+2, Sn+3, etc. Figure 3 The scan line driver chip 101 and the data line driver chip 102 are not shown, but the scan line driver chip 101 can be connected to the control end of each transistor T0 through each scan line, and the data line driver chip 102 can be connected to the cathode of each light emitting diode D1 through each data line.

[0084] It is understandable that the connection relationship between the transistor T0 and the light-emitting diode D1 in each pixel unit in this embodiment and the scan line driver chip 101 and the data line driver chip 102 is consistent, and this embodiment and the following embodiments can be described by any pixel unit.

[0085] The scan line driving chip 101 is used to output the PWM scan control signal to the transistor T0 through the scan line.

[0086] The data line driving chip 102 is used to output the PWM data control signal to the cathode of the light emitting diode D1 through the data line.

[0087] The transistor T0 is used to connect the driving power supply to the anode of the light-emitting diode based on the PWM data control signal when the received PWM scanning control signal is in a high level state, so that the driving power supply drives the light-emitting diode.

[0088] In a specific implementation, the scan line driver chip 101 can output a PWM scan control signal to each transistor T0 through scan lines such as scan line Gn, scan line Gn+1, scan line Gn+2, scan line Gn+3, and scan line Gn+4. The data line driver chip 102 can output a PWM data control signal to each light emitting diode D1 through data lines such as data line Sn, data line Sn+1, and data line Sn+2.

[0089] In this embodiment, the transistor T0 in each pixel unit can be an NMOS tube. For the transistor T0 in any pixel unit, it is controlled by the scan line driver chip 101, and is closed when receiving the PWM scan control signal output by the scan line driver chip 101 in a high level state, and the driving power source E can be connected to the anode of the light-emitting diode D1. The cathode of the light-emitting diode D1 is connected to the data line, and can receive the PWM data control signal output by the data line driver chip 102 through the data line. When the PWM data control signal is in a low level state and the driving power source E outputs a high level signal to the light-emitting diode D1, the light-emitting diode D1 can be turned on, and the driving power source E is successfully connected to the light-emitting diode D1, thereby driving the light-emitting diode D1.

[0090] Furthermore, in this embodiment, the driving power source E at least includes a positive driving power source ELVDD.

[0091] The positive driving power source ELVDD is connected to the input end of each of the transistors T0 .

[0092] It should be noted that the positive driving power ELVDD may be a positive power supply in the display panel, which can provide a positive electrode voltage or a high-level signal for electroluminescence.

[0093] In the same pixel unit, the output end of the transistor T0 is connected to the anode of the light emitting diode D1.

[0094] The transistor T0 is used to connect the positive driving power ELVDD to the anode of the light-emitting diode D1 when the received PWM scanning control signal is in a high level state and the PWM data control signal output by the data line driving chip to the cathode of the light-emitting diode D1 is in a low level state, so that the positive driving power ELVDD drives the light-emitting diode D1.

[0095] In a specific implementation, for any transistor T0, when it is closed when receiving a PWM scan control signal in a high level state, the positive drive power supply ELVDD can output a high level signal to the anode of the light-emitting diode D1. At the same time, when the PWM data control signal received at the cathode of the light-emitting diode D1 is in a low level state, the light-emitting diode D1 is forward-conducted, so that the positive drive power supply ELVDD is connected to the anode of the light-emitting diode D1, thereby driving the light-emitting diode D1 and lighting up the light-emitting diode D1.

[0096] It should be understood that each transistor T0 can be turned on and off row by row so that the light-emitting diodes on each scan line can be lit once per frame instead of being lit all the time, which can eliminate the visual residue of the previous frame and thus improve the display effect.

[0097] For ease of understanding, refer to Figure 4 Provide explanation. Figure 4 This is a driving timing diagram of the second embodiment of the display panel of the present application. Figure 4 In the figure, T1 to T12 are moments, OE is the enable output of the PWM scan control signal on the scan line Gn, for the light emitting diode D1 on the scan line Gn, when the PWM scan control signal in the scan line Gn is in a high level state and the PWM data control signal on the data line Sn is in a low level state, the transistor T0 is closed, the positive driving power supply ELVDD is connected to the light emitting diode D1, and the light emitting diode D1 is forwardly conducted and emits light, and the light brightness of the light emitting diode D1 can be controlled by adjusting the time when the PWM data control signal in a row is in a low level state.

[0098] Specifically, at time T1, the PWM scan control signal on the scan line Gn is in a high level state, and the PWM data control signal on the data line Sn is in a low level state during the period from T2 to T3, so the light-emitting diode T2 connected to the scan line Gn continues to emit light during the period from T2 to T3. At T3, the PWM time control signal on the data line Sn is switched to a high level state, and the light emission ends. After T4, the PWM scan control signal on the scan line Gn is in a low level state, and each light-emitting diode D1 connected to the scan line Gn stops emitting light.

[0099] At T5, the PWM scanning control signal on the scanning line Gn+1 is in a high-level state, and the PWM time control signal on the data line Sn is in a low-level state during the period from T6 to T7, so the light-emitting diode connected to the scanning line Gn+2 continues to emit light during the period from T6 to T7. At T7, the PWM time control signal on the data line Sn switches to a high-level state, and the light emission ends. After T7, the PWM scanning control signal on the scanning line Gn+1 is in a low-level state, and each light-emitting diode D1 connected to the scanning line Gn+1 stops emitting light. For the periods of T8, T9, T10, T11, and T12, the driving timing of the light-emitting diode D1 connected to other scanning lines such as Gn+2 and Gn+3 can refer to the above description, and will not be repeated here.

[0100] It should be noted that the positions of T2 and T6 are periodically constant, the positions of T1 and T4 are also periodically constant, and the time difference between T2 and T1 is equal to the time difference between T6 and T5. The light-emitting diode D1 connected to the data line Gn+1 ends emitting light at T7, so the emitting time can be adjusted by adjusting the positions of T3 and T7. In addition, the grayscale is formed by the brightness integral within a frame time, that is, the grayscale of the light-emitting diode D1 can be controlled by adjusting the emitting time of any light-emitting diode D1 (such as adjusting the interval between T3 and T2 or adjusting the interval between T7 and T6), rather than controlling the grayscale by the opening degree of the transistor T0, so that the characteristic deviation of the transistor T0 can be avoided, so that the grayscale control can be more accurate.

[0101] In this embodiment, the scan driver chip 101 only outputs a PWM scan control signal to turn on the transistor T0 row by row, which can make the scan line design thinner, thereby reducing the parasitic capacitance between the scan line and the data line. In addition, the power consumption required for the continuous switching of the transistor T0 on and off is relatively small, so a low-power scan line control chip 101 can be selected to reduce the driving cost and heat dissipation cost of the display panel. At the same time, each light-emitting diode D1 is driven by a positive driving power supply ELVDD in the display panel, and there is no need to switch on and off, which can effectively reduce the driving delay.

[0102] Based on the first embodiment of the present application, the third embodiment of the present application is proposed. In the third embodiment of the present application, the same or similar contents as those of the first and second embodiments can be referred to the above introduction, and will not be repeated in the following. Figure 5 , Figure 5 It is a schematic structural diagram of the third embodiment of the display panel of the present application.

[0103] In this embodiment, the driving chip includes: a scan line driving chip 101 and a data line driving chip 102 .

[0104] It should be noted that although Figure 5 The scan line driver chip 101 and the data line driver chip 102 are not shown, but the data line driver chip 102 can be connected to the control end of each transistor T0 through a data line, and the scan line driver chip 101 can be connected to the anode of each light emitting diode D1 through a scan line.

[0105] The data line driving chip 102 is used to output the PWM data control signal to the transistor T0 through the data line.

[0106] The scan line driving chip 101 is used to output the PWM scan control signal to the anode D1 of the light emitting diode through the scan line.

[0107] The transistor T0 is used for connecting the driving power source E to the cathode of the light emitting diode D1 based on the PWM scanning control signal when receiving the PWM data control signal, so that the driving power source E drives the light emitting diode D1.

[0108] In a specific implementation, the data line driver chip 102 can output a PWM data control signal to each transistor T0 through data lines such as data line Sn, data line Sn+1, data line Sn+2, etc. The scan line driver chip 101 can output a PWM scan control signal to each light emitting diode D1 through scan lines such as scan line Gn, scan line Gn+1, scan line Gn+2, scan line Gn+3, scan line Gn+4, etc.

[0109] In this embodiment, the transistor T0 in each pixel unit can be a PMOS tube. For the transistor T0 in any pixel unit, it is controlled by the data line driving chip 102, and is closed when receiving the PWM scanning control signal output by the data line driving chip 102 in a low-level state, and the driving power source E can be connected to the cathode of the light-emitting diode D1. The anode of the light-emitting diode D1 is connected to the scanning line, and can receive the PWM scanning control signal output by the scanning line driving chip 101 through the scanning line. When the PWM scanning control signal is in a high-level state and the driving power source E outputs a low-level signal to the light-emitting diode D1, the light-emitting diode D1 can be turned on, and the driving power source E is successfully connected to the light-emitting diode D1, thereby driving the light-emitting diode D1.

[0110] Furthermore, in this embodiment, the driving power source E also includes a negative driving power source ELVSS.

[0111] The negative driving power source ELVSS is connected to the output end of each of the transistors T0.

[0112] It should be noted that the negative driving power source ELVSS may be a negative power source in the display panel, and may provide a negative electrode voltage or a low-level signal for electroluminescence.

[0113] In the same pixel unit, the input end of the transistor T0 is connected to the cathode of the light emitting diode D1.

[0114] The transistor T0 is used to connect the negative driving power supply ELVSS to the cathode of the light-emitting diode D1 when the received PWM data control signal is in a low level state and the PWM scanning control signal output by the scanning line driving chip to the anode of the light-emitting diode D1 is in a high level state, so that the negative driving power supply ELVSS drives the light-emitting diode D1.

[0115] In a specific implementation, for any transistor T0, when it is closed when receiving a PWM data control signal in a low level state, the negative drive power supply ELVSS can output a low level signal to the cathode of the light-emitting diode D1. At the same time, when the PWM scan control signal received by the anode of the light-emitting diode D1 is in a high level state, the light-emitting diode D1 is forward-conducted, so that the negative drive power supply ELVSS is connected to the cathode of the light-emitting diode D1, thereby driving the light-emitting diode D1 and lighting up the light-emitting diode D1.

[0116] It should be understood that each transistor T0 can be turned on and off row by row so that the light-emitting diodes on each scan line can be lit once per frame instead of being lit all the time, which can eliminate the visual residue of the previous frame and thus improve the display effect.

[0117] It should be noted that the timing control of this embodiment can refer to the above Figure 4 For the light-emitting diode D1 of the scanning line Gn, when the PWM scanning control signal in the scanning line Gn is in a high-level state and the PWM data control signal of the data line Sn is in a low-level state, the transistor T0 is closed, and the negative driving power supply ELVSS is connected to the light-emitting diode D1, and the light-emitting diode D1 is forward-conducted and emits light. By adjusting the time when the PWM data control signal in a row is in a low-level state, the light-emitting brightness of the light-emitting diode D1 can be controlled, thereby avoiding the characteristic deviation of the transistor T0, thereby making the grayscale control more accurate.

[0118] For each row of light emitting diodes D1, the above Figure 4 The relevant description in will not be repeated here.

[0119] In this embodiment, the data driver chip 102 only outputs the PWM data control signal to turn on the transistor T0 row by row, so that the data line can be designed to be thinner, thereby reducing the parasitic capacitance between the scan line and the data line. In addition, the power consumption required for the continuous switching of the transistor T0 on and off is relatively small, so a low-power data control chip 102 can be selected to reduce the driving cost and heat dissipation cost of the display panel. At the same time, each light-emitting diode D1 is driven by a positive driving power supply ELVSS in the display panel, and there is no need to switch on and off, which can effectively reduce the driving delay.

[0120] Based on the first embodiment of the present application, the fourth embodiment of the present application is proposed. In the fourth embodiment of the present application, the same or similar contents as those of the first embodiment, the second embodiment, and the third embodiment can be referred to the above introduction, and will not be repeated here. Figure 6 , Figure 6 It is a structural schematic diagram of a fourth embodiment of a display panel of the present application.

[0121] In this embodiment, the driving chip 100 includes a scan line driving chip 101 and a data line driving chip 102 .

[0122] Each of the pixel units is provided with a switch unit 200, and the switch unit 200 includes a plurality of transistors.

[0123] The scan line driver chip 101 is connected to the first control end of each switch unit 200 through the scan line, the data line driver chip 102 is connected to the second control end of each switch unit 200 through the data line, and the driving power source E is connected to the light-emitting diode D1 through the switch unit 200.

[0124] The driving power source E includes a positive driving power source ELVDD and a negative driving power source ELVSS. The positive driving power source ELVDD is connected to the anode of the light emitting diode D1 through the switch unit 200, and the negative driving power source ELVSS is connected to the cathode of the light emitting diode D1.

[0125] The scan line driving chip 101 is used to output the PWM scan control signal to the switch unit 200 through the scan line.

[0126] The data line driving chip 102 is used to output the PWM data control signal to the switch unit 200 through the data line.

[0127] The switch unit is used to connect the driving power source to the light emitting diode through the PWM scanning control signal and the PWM data control signal, so that the driving power source E drives the light emitting diode.

[0128] It should be noted that the switch unit 200 may be provided with at least two transistors T0, the control end of any transistor is connected to the scan line driver chip 101 and is controlled by the scan line driver chip 101, and the control end of the other transistor is connected to the data line driver chip 102 and is controlled by the data line driver chip 102.

[0129] In a specific implementation, the scan line driver chip 101 can output a PWM scan control signal to the switch unit 200 in each pixel unit through scan lines such as scan line Gn, scan line Gn+1, scan line Gn+2, scan line Gn+3, and scan line Gn+4. The data line driver chip 102 can output a PWM data control signal to the switch unit 200 in each pixel unit through data lines such as data line Sn, data line Sn+1, and data line Sn+2.

[0130] Accordingly, after receiving the PWM scan control signal and the PWM data control signal, the switch unit 200 can close the corresponding transistor based on the level states of the PWM scan control signal and the PWM data control signal, thereby connecting the driving power source E to the light emitting diode D1.

[0131] Specifically, after each transistor in the switch unit 200 is closed, the loop between the positive driving power supply ELVDD, the light emitting diode D1 and the negative driving power supply ELVSS can be turned on, so that the positive driving power supply ELVDD is connected to the anode of the light emitting diode D1, and a high level signal is provided to the anode of the light emitting diode D1. When the anode of the light emitting diode D1 is connected to the positive driving power supply ELVDD, the negative driving power supply ELVSS can provide a low level signal to the cathode of the light emitting diode D1, so that the light emitting diode D1 is forward-conducted and the light emitting diode D1 is driven.

[0132] Further, refer to Figure 7 , Figure 7 Schematic diagram of the specific structure of the switch unit in the fourth embodiment of the display panel of the present application. Figure 7 In the embodiment, the switch unit 200 in each pixel unit includes: a first transistor T1 and a second transistor T2.

[0133] although Figure 7 The scan line driver chip 101 and the data line driver chip 102 are not shown, but in the same pixel unit, the control end of the first transistor T1 can be connected to the scan line driver chip 101 through the scan line, the control end of the second transistor T2 can be connected to the data line driver chip 102 through the data line, the input end of the first transistor T1 is connected to the positive driving power supply ELVDD, the output end of the first transistor T1 is connected to the input end of the second transistor T2, and the output end of the second transistor T2 is connected to the anode of the light emitting diode D1.

[0134] The first transistor T1 is used to close when the PWM scanning control signal is in a high level state, and connect the positive driving power source ELVDD to the second transistor T2.

[0135] The second transistor T2 is used to close when the PWM data control signal is in a low level state, and connect the connected positive driving power ELVDD to the anode of the light emitting diode D1.

[0136] In a specific implementation, the scan line driver chip 101 can output a PWM scan control signal to each first transistor T1 through scan lines such as scan line Gn, scan line Gn+1, scan line Gn+2, scan line Gn+3, and scan line Gn+4. The data line driver chip 102 can output a PWM data control signal to each second transistor T2 through data lines such as data line Sn, data line Sn+1, and data line Sn+2.

[0137] In this embodiment, the first transistor T1 in each pixel unit may be an NMOS transistor, and the second transistor T2 may be a PMOS transistor. The first transistor T1 is closed when receiving the PWM scan control signal output by the scan line driver chip 101 in a high level state, and the positive drive power ELVDD is connected to the second transistor T2. The second transistor T2 is closed when receiving the PWM data control signal output by the data line driver chip 102 in a low level, and then the positive drive power ELVDD is connected to the anode of the light emitting diode D1, thereby turning on the drive circuit between the positive drive power ELVDD, the light emitting diode D1 and the negative drive power ELVSS, so that the light emitting diode D1 is forward-conducted, and the light emitting diode D1 is driven.

[0138] It should be understood that each transistor T0 can be turned on and off row by row so that the light-emitting diodes on each scan line can be lit once per frame instead of being lit all the time, which can eliminate the visual residue of the previous frame and thus improve the display effect.

[0139] It should be noted that the timing control of this embodiment can refer to the above Figure 4 For the light-emitting diode D1 of the scanning line Gn, when the PWM scanning control signal of the scanning line Gn is in a high-level state and the PWM data control signal of the data line Sn is in a low-level state, the first transistor T1 and the second transistor T2 are closed, and the positive driving power supply ELVDD is connected to the light-emitting diode D1, and the light-emitting diode D1 is forward-conducted and emits light. By adjusting the time when the PWM data control signal in a row is in a low-level state, the light-emitting brightness of the light-emitting diode D1 can be controlled, so that the characteristic deviation of the transistor T0 can be avoided, so that the grayscale control can be more accurate.

[0140] For each row of light emitting diodes D1, the above Figure 4 The relevant description in will not be repeated here.

[0141] In this embodiment, the scan driver chip 101 only outputs a PWM scan control signal to turn on the first transistor T1 row by row, and the data driver chip 102 only outputs a PWM data control signal to turn on the second transistor T2 row by row, so that the routing of the scan line and the data line can be designed to be relatively thin, thereby reducing the parasitic capacitance between the scan line and the data line. In addition, the power consumption required for the continuous switching of the first transistor T1 and the second transistor T2 on and off is relatively small. Therefore, low-power scan line control chips 101 and data line control chips 102 can be selected to effectively reduce the driving cost and heat dissipation cost of the display panel. At the same time, each light-emitting diode D1 is DC-driven by the positive driving power supply ELVDD and the negative driving power supply ELVSS in the display panel, without the need to switch on and off, which can effectively reduce the driving delay.

[0142] The present application also proposes a driving method of the display panel based on the above embodiment, and the driving control method includes:

[0143] S10, controlling the transistor in any pixel unit to close by a PWM scan control signal output by a scan line or a PWM data control signal output by a data line, so that a driving power source is connected to a light emitting diode to drive the light emitting diode.

[0144] It should be noted that the execution subject of the method of this embodiment may be a driver chip. When the driver chip 100 is connected to the transistor in each pixel unit through each scan line, it can output a PWM scan control signal to each transistor through each scan line. When the driver chip 100 is connected to the transistor in each pixel unit through each data line, it can output a PWM data control signal to each transistor T0 through each data line.

[0145] It is understandable that when the transistor receives the PWM scan control signal or the PWM data control signal, it can be closed according to the high and low level states in the PWM scan control signal or the PWM data control signal. For example, when the transistor is an NMOS tube, it can be closed when the signal is in a high level state, and when the transistor is a PMOS tube, it can be closed when the signal is in a low level state. After the transistor is closed, the drive circuit between the driving power supply and the light-emitting diode can be turned on, the driving power supply is connected to the light-emitting diode, and the driving power supply drives the light-emitting diode, so that the driving chip only outputs the PWM scan control signal or the PWM data control signal for timing control, and does not drive the light-emitting diode D1.

[0146] In this embodiment, the PWM scanning control signal output by the scanning line or the PWM data control signal output by the data line controls the transistor in any pixel unit to close, so that the driving power supply is connected to the light-emitting diode to drive the light-emitting diode. Since the light-emitting diode in this embodiment is driven by the driving power supply, and the driving chip is only used to drive the transistor, there is no need to design a thicker line width, and the driving power supply can output a larger current, thereby effectively reducing the parasitic capacitance of the wiring between the data line and the scanning line, avoiding wasting more power consumption to overcome the influence of the parasitic capacitance, and thus effectively reducing the overall power consumption of the driving architecture.

[0147] The present application also provides a display device, which includes the display panel described in the above embodiment.

[0148] The display device provided by the present application adopts the display panel in the above embodiment, which can solve the technical problem that the data line and the scan line in the prior art have thicker line widths, resulting in a large parasitic capacitance between the data line and the scan line, which results in a large amount of power consumption to overcome the influence of the parasitic capacitance. Compared with the prior art, the beneficial effects of the display device provided by the present application are the same as those of the display panel provided by the above embodiment, which will not be described in detail here.

[0149] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A display panel, characterized in that: The display panel includes: a driving chip, a driving power supply and a plurality of pixel units; Each of the pixel units comprises: a transistor and a light emitting diode; The driving chip is connected to the control end of each transistor through a scan line or a data line, and the driving power supply is connected to each light emitting diode through each transistor; Wherein, the line width of the data line and / or the scan line is smaller than the transmission line between the driving power source and the light emitting diode; The driving chip is used to output a PWM scanning control signal to any of the transistors through the scanning line, or to output a PWM data control signal to any of the transistors through the data line; The transistor is used to connect the driving power supply to the light-emitting diode in the same pixel unit when receiving the PWM scanning control signal or the PWM data control signal, so that the driving power supply drives the light-emitting diode.

2. The display panel according to claim 1, wherein: The driving chip includes: a scan line driving chip and a data line driving chip; The scan line driving chip is connected to the control end of each transistor through the scan line, and the data line driving chip is connected to the cathode of each light emitting diode through the data line; The scan line driving chip is used to output the PWM scan control signal to the transistor through the scan line; The data line driving chip is used to output the PWM data control signal to the cathode of the light emitting diode through the data line; The transistor is used to connect the driving power supply to the anode of the light-emitting diode based on the PWM data control signal when the received PWM scanning control signal is in a high level state, so that the driving power supply drives the light-emitting diode.

3. The display panel according to claim 2, wherein: The driving power supply at least includes a positive driving power supply; The positive driving power supply is connected to the input terminal of each of the transistors; In the same pixel unit, the output end of the transistor is connected to the anode of the light emitting diode; The transistor is used to connect the positive driving power supply to the anode of the light-emitting diode when the received PWM scanning control signal is in a high level state and the PWM data control signal output by the data line driving chip to the cathode of the light-emitting diode is in a low level state, so that the positive driving power supply drives the light-emitting diode.

4. The display panel according to claim 1, wherein: The driving chip includes: a scan line driving chip and a data line driving chip; The data line driving chip is connected to the control end of each transistor through the data line, and the scan line driving chip is connected to the anode of each light emitting diode through the scan line; The data line driving chip is used to output the PWM data control signal to the transistor through the data line; The scan line driving chip is used to output the PWM scan control signal to the anode of the light emitting diode through the scan line; The transistor is used to connect the driving power supply to the cathode of the light-emitting diode based on the PWM scan control signal when receiving the PWM data control signal, so that the driving power supply drives the light-emitting diode.

5. The display panel according to claim 4, wherein: The driving power supply also includes a negative driving power supply; The negative driving power supply is connected to the output end of each of the transistors; In the same pixel unit, the input terminal of the transistor is connected to the cathode of the light emitting diode; The transistor is used to connect the negative driving power supply to the cathode of the light-emitting diode when the received PWM data control signal is in a low level state and the PWM scanning control signal output by the scanning line driving chip to the anode of the light-emitting diode is in a high level state, so that the negative driving power supply drives the light-emitting diode.

6. The display panel according to claim 1, wherein: The driving chip includes: a scan line driving chip and a data line driving chip; Each of the pixel units is provided with a switch unit, and the switch unit includes a plurality of transistors; The scan line driving chip is connected to the first control end of each of the switch units through the scan line, the data line driving chip is connected to the second control end of each of the switch units through the data line, and the driving power supply is connected to the light emitting diode through the switch unit; The scan line driving chip is used to output the PWM scan control signal to the switch unit through the scan line; The data line driving chip is used to output the PWM data control signal to the switch unit through the data line; The switch unit is used to connect the driving power supply to the light emitting diode through the PWM scanning control signal and the PWM data control signal, so that the driving power supply drives the light emitting diode.

7. The display panel according to claim 6, wherein: The driving power supply includes: a positive driving power supply and a negative driving power supply; The positive driving power supply is connected to the anode of each light emitting diode through each switch unit; The negative driving power supply is connected to the cathode of each of the light emitting diodes; The switch unit is used to connect the positive driving power supply to the anode of the light emitting diode through the PWM scanning control signal and the PWM data control signal; The negative driving power supply is used to drive the light emitting diode when the anode of the light emitting diode is connected to the positive driving power supply.

8. The display panel according to claim 7, wherein: The switch unit in each of the pixel units includes: a first transistor and a second transistor; In the same pixel unit, the control end of the first transistor is connected to the scan line driver chip through the scan line, the control end of the second transistor is connected to the data line driver chip through the data line, the input end of the first transistor is connected to the positive driving power supply, the output end of the first transistor is connected to the input end of the second transistor, and the output end of the second transistor is connected to the anode of the light emitting diode; The first transistor is used to close when the PWM scanning control signal is in a high level state, and connect the positive driving power supply to the second transistor; The second transistor is used to close when the PWM data control signal is in a low level state, so as to connect the connected positive driving power supply to the anode of the light emitting diode.

9. A method for driving a display panel according to any one of claims 1 to 8, characterized in that: The driving method comprises: The transistor in any pixel unit is controlled to be closed through the PWM scanning control signal output by the scanning line or the PWM data control signal output by the data line, so that the driving power source is connected to the light emitting diode to drive the light emitting diode.

10. A display device, characterized in that: The display device comprises the display panel according to any one of claims 1 to 8.

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