CN110599955A - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN110599955A CN110599955A CN201910885412.0A CN201910885412A CN110599955A CN 110599955 A CN110599955 A CN 110599955A CN 201910885412 A CN201910885412 A CN 201910885412A CN 110599955 A CN110599955 A CN 110599955A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- Electroluminescent Light Sources (AREA)
Abstract
The embodiment of the invention discloses a display panel and a display device. The display panel comprises a display area and a non-display area; the display area is provided with a plurality of pixel driving circuits and a plurality of light-emitting units, each light-emitting unit comprises a first electrode and a second electrode, and the first electrode of each light-emitting unit is connected with one pixel driving circuit; the non-display area is provided with a power line, and the second electrode of the light-emitting unit is connected with the power line; the pixel driving circuit includes an initialization signal input terminal connected to the power line. The embodiment of the invention can reduce the frame of the display panel and improve the screen occupation ratio.
Description
Technical Field
The present invention relates to display technologies, and in particular, to a display panel and a display device.
Background
With the development of display technology, the display panel has a larger and larger function, and is more and more widely applied in various fields.
However, the frame of the conventional display panel is still wide, and the requirement of a narrow frame cannot be met, so that the further application of the display panel is limited.
Disclosure of Invention
The invention provides a display panel and a display device, which are used for reducing the frame of the display panel.
In a first aspect, an embodiment of the present invention provides a display panel, including: a display area and a non-display area; the display area is provided with a plurality of pixel driving circuits and a plurality of light-emitting units, each light-emitting unit comprises a first electrode and a second electrode, and the first electrode of each light-emitting unit is connected with one pixel driving circuit; the non-display area is provided with a power line, and the second electrode of the light-emitting unit is connected with the power line; the pixel driving circuit includes an initialization signal input terminal connected to the power line.
Optionally, the pixel driving circuit includes a first switching transistor; a first pole of the first switching transistor is electrically connected to the power line as the initialization signal input terminal, a second pole of the first switching transistor is connected to the first electrode of the light emitting unit, and a gate of the first switching transistor is electrically connected to the first scan line.
Optionally, the pixel driving circuit includes a second switching transistor and a driving transistor; a first pole of the second switching transistor is electrically connected to the power line as the initialization signal input terminal, a second pole of the second switching transistor is connected to the gate of the driving transistor, and the gate of the second switching transistor is connected to the second scan line.
Optionally, the display device further includes a data line, the pixel driving circuit includes a data signal input terminal, and the data signal input terminal is electrically connected to the data line; the power line and the data line are arranged on the same layer.
Optionally, the power line is disposed around the display area.
Optionally, the display area is provided with a plurality of reference lines, the initialization signal input end is electrically connected to the corresponding reference line, and the reference line extends to the non-display area and is connected to the power line.
Optionally, the non-display area includes a lower step area, the display panel includes a plurality of auxiliary lines arranged along a first direction and extending along a second direction, the second electrodes of the light emitting units form a whole cathode layer, the cathode layer is connected to the auxiliary lines through via holes, and the auxiliary lines are connected to portions of the power lines located in the lower step area; wherein the first direction is perpendicular to the second direction.
Optionally, the level value range on the power line is-5V to 0V.
Optionally, the level value on the power line is-3V.
In a second aspect, an embodiment of the present invention further provides a display device, including the display panel according to the first aspect.
The display panel adopted by the invention comprises a display area and a non-display area; the non-display area is provided with a plurality of pixel driving circuits and a plurality of light-emitting units, each light-emitting unit comprises a first electrode and a second electrode, and the first electrode of each light-emitting unit is connected with one pixel driving circuit; the non-display area is provided with a power line, and the second electrode of the light-emitting unit is connected with the power line; the pixel driving circuit comprises an initialization signal input end which is electrically connected with a power line. Only the power line can provide a power signal to the second electrode of the light-emitting unit and an initialization signal to the initialization signal input end of the pixel driving circuit, so that an initialization signal line does not need to be arranged when wiring is carried out in the non-display area, the width of the non-display area is shortened, the frame is also shortened, and the screen occupation ratio is improved.
Drawings
FIG. 1 is a schematic diagram of a display panel according to the prior art;
fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 3 is a schematic circuit structure diagram of a pixel driving circuit according to an embodiment of the invention;
fig. 4 is a cross-sectional view of a display panel according to an embodiment of the invention;
fig. 5 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 7 is a cross-sectional view taken along line A1A2 of FIG. 6;
fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
As mentioned in the background art, the conventional display panel has a wider frame, and the inventors have found through careful study that the reason for this technical problem is: referring to fig. 1, fig. 1 is a schematic structural diagram of a display panel in the prior art, for example, for an OLED (Organic Light-Emitting Diode) display panel, the display panel includes a display area 11 ' and a non-display area 12 ', a first power line (VSS line) 13 ', a Light-Emitting control circuit (EM circuit) 15 ', a scanning circuit (SCAN circuit) 15 ', an initialization signal line (VREF line) 16 ' and the like need to be arranged in a frame (non-display area 12 ') on left and right sides of the display panel, and the display area 11 ' includes a plurality of pixel driving circuits 17 ' and OLED devices 18 ', the OLED devices 18 ' are correspondingly disposed in an area defined by a plurality of scanning lines S ' and DATA lines DATA ' which are staggered horizontally and vertically; VSS lines 13 'are used to provide electrical signals to the cathodes of the respective OLED devices 18'; the EM circuit 15 'is used to provide a light emitting control signal to the light emitting control signal input terminal in the pixel driving circuit to apply the voltage on the second power line ELVDD' to the anode of the OLED device during the light emitting period; a SCAN circuit (SCAN circuit) 15 'for supplying a SCAN signal to the pixel drive circuit 17'; the VREF signal line 16' is used for providing an initialization signal to initialize the anode of the OLED device and the gate of the driving transistor in an initialization stage; each signal line or circuit needs to occupy a certain frame width independently, and the combination of the signal lines or the circuits occupies a larger whole width of the frame; therefore, the conventional display panel has a problem of large frame.
Based on the technical problem, the invention provides the following solution:
fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present invention, and referring to fig. 2, the display panel includes a display area 11 and a non-display area 12; the display area 11 is provided with a plurality of pixel driving circuits 13 and a plurality of light emitting units 14, the light emitting units 14 comprise a first electrode and a second electrode, and the first electrode of each light emitting unit 14 is connected with one pixel driving circuit 13; the non-display region 12 is provided with a power line 15, and the second electrode of the light emitting unit 14 is connected to the power line 15; the pixel driving circuit 13 includes an initialization signal input terminal a connected to the power supply line 15.
Specifically, the display area 11 may include a plurality of pixel driving circuits 13 and light emitting units 14 arranged in a matrix form, the pixel driving circuits 13 and the light emitting units 14 may be arranged in a one-to-one correspondence, the pixel driving circuits 13 may provide driving signals (driving currents) for the light emitting units 14, and in the light emitting stage, the light emitting units 14 respond to the driving signals to realize light emission; the power line 15 can provide a power signal to the second electrode of the light emitting unit 14, so that a voltage difference exists between the first electrode and the second electrode of the light emitting unit 14 in a light emitting phase (the first electrode may be an anode, and the second electrode may be a cathode), so that the light emitting unit 14 stably emits light, and can provide an initialization signal to the initialization signal input terminal a of the pixel driving circuit 13, so that the pixel driving circuit 13 can initialize the gate of the driving transistor in the pixel driving circuit 13 and the first electrode of the light emitting unit 14 in an initialization phase, so that in a data writing phase, the driving transistor can be turned on, and subsequent operations such as data writing are facilitated. Signals can be simultaneously provided for the second electrode of the light emitting unit 14 and the initialization signal input end a of the pixel driving circuit 13 through the power line 15, an initialization signal line does not need to be arranged in the non-display area, i.e., two signal lines do not need to be arranged to respectively provide signals for the second electrode of the light emitting unit 14 and the initialization signal input end a of the pixel driving circuit 13, i.e., the initialization signal lines of the non-display area are reduced, while a general initialization signal line is arranged at a frame position, and further, when wiring is performed in the non-display area 12 of the display panel, the number of the initialization signal lines can be reduced, so that the width required by the non-display area 12 is reduced, the frame is reduced, and the screen occupation ratio is improved. Meanwhile, as shown in fig. 2, the non-display area 12 may further include a light emission control circuit (EM circuit) 151 and a SCAN circuit (SCAN circuit) 152, wherein light emission control signal terminals of the pixel driving circuits located in the same row are connected to the same light emission control signal line EM and connected to the EM circuit 151, and the EM circuit 151 provides a light emission control signal to the pixel driving circuits, so that the pixel driving circuits apply a voltage on the positive power line ELVDD to the first electrode (anode) of the light emitting unit 14 in a light emission stage; the SCAN signal input terminals of the pixel driving circuits in the same row are connected to the same SCAN line S and to the SCAN circuit 152, so as to provide the SCAN signals to the pixel driving circuits; compared to the existing display panel, since it is not necessary to separately provide the initialization signal line, the power line 15 is used to supply the initialization signal to the pixel driving circuit 13 and the power signal to the second electrode of the light emitting unit 14; in the prior art, the light-emitting control signal line EM is overlapped with the initialization signal line, and the initialization signal line is not arranged, so that the load of the light-emitting control signal line EM is reduced, and the normal use of the display panel is ensured; in the prior art, the scanning line S is overlapped with the initialization signal line, and the initialization signal line is not arranged, so that the load of the scanning line S is reduced, and the normal use of the display panel is ensured.
According to the technical scheme of the embodiment, the adopted display panel comprises a display area and a non-display area; the non-display area is provided with a plurality of pixel driving circuits and a plurality of light-emitting units, each light-emitting unit comprises a first electrode and a second electrode, and the first electrode of each light-emitting unit is connected with one pixel driving circuit; the non-display area is provided with a power line, and the second electrode of the light-emitting unit is connected with the power line; the pixel driving circuit comprises an initialization signal input end which is electrically connected with a power line. The power line is only required to provide a power signal for the second electrode of the light-emitting unit and an initialization signal for the initialization signal input end of the pixel driving circuit, so that the initialization signal line does not need to be arranged independently when wiring is carried out in the non-display area, the width of the non-display area is further shortened, the frame is also shortened, and the screen occupation ratio is improved. Meanwhile, the scanning lines S and the emission control signal lines EM are no longer overlapped with the initialization signal lines, so that the loads of the scanning lines S and the emission control signal lines EM are reduced, and the normal operation of the display panel is ensured.
Optionally, fig. 3 is a schematic circuit structure diagram of a pixel driving circuit according to an embodiment of the present invention, referring to fig. 3 and in conjunction with fig. 2 and 3, the pixel driving circuit 13 includes a first switching transistor T1, a second switching transistor T2, a third switching transistor T3, a fourth switching transistor T4, a fifth switching transistor T5, a sixth switching transistor T6, a driving transistor DT, and a storage capacitor C, and the display panel further includes a power line 15, a first scanning signal line S1, a second scanning signal line S2, and a DATA line DATA. The first electrode (source) of the driving transistor DT is connected to the first node N1, the gate of the driving transistor DT is connected to the second node N2, and when the pixel driving circuit is in operation, the second switching transistor T2 is turned on when the second scan signal line S2 is at a low level, so as to charge the voltage on the power line 15 to the second node N2, wherein the voltage value on the power line 15 may be VINT, and VINT is a negative voltage. When the first scan signal line S1 is at a low level, the third switching transistor T3 and the fourth switching transistor T4 are turned on, and the voltage on the DATA line DATA is charged to the second node N2. The light emitting unit 14 may be an OLED device, the light emission control signal input terminal EM1 is electrically connected to the light emission control signal line EM, and when the light emission control signal input terminal EM1 receives a low level signal, the fifth switching transistor T5 and the sixth switching transistor T6 are turned on, and a current flows through the OLED device, and the OLED device starts emitting light. The formula of the final light-emitting current of the OLED device is as follows: i ═ a (V)ELVDD-Vdata) 2, where A is a constant value associated with the driving transistor DT, VELVDDIndicating the voltage, V, on the positive power supply line ELVDDdataRepresenting the voltage on the DATA line DATA, the resulting OLED device current and drive transistorThe threshold voltage of the transistor DT is independent, and the transistor DT has a threshold compensation function.
A first electrode of the first switching transistor T1 is electrically connected to the power line 15 as an initialization signal input terminal a, a second electrode of the first switching transistor T1 is electrically connected to the first electrode of the light emitting cell 14, and a gate electrode of the first switching transistor T1 is electrically connected to the first scan line S1.
Specifically, the first switching transistor T1 may be a P-type transistor, the power line 15 may continuously transmit a power signal, for example, a low level signal, when a scan signal (e.g., a low level) exists on the first scan line S1, the first pole and the second pole of the first switching transistor T1 are turned on, so that the signal on the power line 15 is transmitted to the first electrode of the light emitting unit 14 to initialize the light emitting unit 14, thereby preventing the light emitting unit 14 from generating an afterimage and a ghost image due to the signal of the previous frame remaining during the light emitting period, and further improving the display effect. Note that the first switching transistor T1 may be an N-type transistor.
Alternatively, with continued reference to fig. 3, a first pole of the second switching transistor T2 is electrically connected to the power line 15 as the initialization signal input terminal a, a second pole of the second switching transistor T2 is electrically connected to the gate of the driving transistor DT, and the gate of the second switching transistor T2 is electrically connected to the second scan line S2.
Specifically, the second switch transistor T2 and the driving transistor DT may both be P-type transistors, and when a scan signal (e.g. low level) exists on the second scan line S2, the first pole and the second pole of the second switch transistor T2 are turned on, so that the signal on the power line 15 is transmitted to the gate of the driving transistor DT, and when a DATA signal needs to be charged into the storage capacitor C in the future, the first pole and the second pole of the driving transistor DT are turned on, so that the DATA signal on the DATA line DATA is charged into the storage capacitor through the third transistor T3, the driving transistor DT and the fourth transistor T4.
Illustratively, the level value on the power line 15 is a negative value, and if the level value is too low, the power consumption is large, and the power line 15 is easily damaged; the level value range on the power line 15 can be set to be-5V-0V, so that the voltage requirement for initializing the first electrode of the light-emitting unit 14 and the grid electrode of the driving transistor DT can be met in the initialization stage, the negative voltage required by the second electrode of the light-emitting unit 14 can be met in the light-emitting stage to ensure the stable light-emitting requirement of the light-emitting unit 14, and meanwhile, the power consumption on the power line 15 can be reduced, so that the overall power consumption of the display panel is reduced; preferably, the level value on the power supply line 15 is-3V.
Optionally, fig. 4 is a cross-sectional view of a display panel according to an embodiment of the present invention, and with reference to fig. 3 and 4, the pixel driving circuit includes a DATA signal input terminal B, and the DATA signal input terminal B is electrically connected to the DATA line DATA; the power line 15 is disposed in the same layer as the DATA line DATA.
Specifically, the display panel may include a plurality of film layers, such as an active layer 201, a gate layer 202, a source drain electrode layer, and the like, a gate insulating layer is disposed between the active layer 201 and the gate layer 202, a source drain electrode 203 in the source drain electrode layer is in contact with the active layer 201 through a via hole, the active layer 201, the gate layer 202, the gate insulating layer, and the source drain electrode form a thin film transistor, and a first electrode 204 of the light emitting unit is in contact with a source electrode of the thin film transistor through a via hole, so as to receive a driving signal provided by the thin film transistor; meanwhile, the power line 15 and the DATA line DATA can be arranged on the same film layer with the source-drain electrode 203, so that the utilization rate of each film layer in the display panel can be improved on the first aspect; in the second aspect, the power line 15 needs to be connected to the sources of the first switching transistor T1 and the second switching transistor T2 in the pixel driving circuit, that is, the wiring between the power line 15 and the first switching transistor T1 and the second switching transistor T2 can be facilitated without connecting them through vias, thereby simplifying the wiring difficulty.
Alternatively, fig. 5 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and referring to fig. 5, the power line 15 is disposed around the display area 11. Specifically, the non-display region 12 may be disposed around the display region 11, the non-display region 12 may be disposed with a bonding region 122, the bonding region 122 is configured to be bonded with a driving chip or a COF, specifically, the bonding region 122 is disposed with a plurality of bonding pads, and an upper pad of the driving chip or a pad on the COF is electrically connected with the bonding pads in the bonding region 122 through anisotropic conductive adhesive, so as to provide various signals required by normal operation of the display panel, for example, provide a cathode power signal to the power line 15; the power supply line 15 is disposed around the display area 11 and connected to the bonding pad within the bonding area 122; in addition, since the cathode layers of the display panel are arranged in a whole layer, the cathode layers can extend from the display area 11 to the non-display area 12 and overlap with the power line 15, when the power line 15 is arranged around the display area 11, the corresponding cathode layers can also extend from the display area 11 to each part of the non-display area 12 adjacent to the display area 11 and overlap with each part of the power line 15; when the power line 15 transmits signals to the cathode layer, the problem that the display is uneven due to the fact that the pressure drop caused by the fact that some light-emitting units in the display area 11 receive signals from the power line 15 for too long distance is avoided, and the signals received by all parts of the cathode layer are even, so that the light of all the light-emitting units in the display panel is even, and the display uniformity is improved.
Optionally, with continued reference to fig. 5, the display area 11 is provided with a plurality of reference lines 301, the initialization signal input terminal a is electrically connected to the corresponding reference line 301, and the reference line 301 extends to the non-display area 12 and is electrically connected to the power line 15.
Specifically, the display area 11 may include a plurality of rows and a plurality of columns of pixel driving circuits 13, the initialization signal input end a of the same row of pixel driving circuits 13 is connected to a reference line 301, and each row of pixel driving circuits 13 may be connected to a reference line 301, so as to reduce the load of the reference line 301; meanwhile, as shown in fig. 5, the reference lines 301 may extend from the display area 11 to the non-display area 12 to be connected to the power lines 15, each of the reference lines 301 may be connected to the power lines 15 in the non-display areas 12 on the left and right sides of the display area 11, respectively, and the binding area 122 is located in the non-display area 12 on the lower side of the display area 11; by the arrangement, the distance between the initialization signal input end A of each pixel driving circuit 13 and the power line 15 for signal transmission is more uniform, the difference of signals received by the initialization signal input end A of each pixel driving circuit 13 is smaller, the phenomenon of uneven display of each light emitting unit is weakened, and the display effect is improved.
Alternatively, fig. 6 is a schematic structural diagram of another display panel according to an embodiment of the present invention, fig. 7 is a cross-sectional view taken along a direction A1a2 in fig. 6, and referring to fig. 6 and 7, the non-display region 12 includes a lower step region 121, the display panel includes a plurality of auxiliary lines 302 arranged along a first direction X and extending along a second direction Y, the second electrodes of the light emitting units form a whole cathode layer 401, the cathode layer 401 is connected to the auxiliary lines 302 through vias, and the auxiliary lines 302 are connected to portions of the power lines 15 located in the lower step region 121; wherein the first direction X is perpendicular to the second direction Y.
Specifically, the light emitting unit may include a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer, and the like, the cathode layer 401 being in contact with the electron injection layer and supplying electrons, and the anode being in contact with the hole injection layer and supplying holes; the cathode layer 401 may be made of a magnesium-silver alloy, and the thickness of the cathode layer 401 is usually set to be thinner to improve the light-emitting efficiency of the light-emitting unit, however, when the cathode layer 401 is thinner, the cathode layer has a larger resistance, so that the voltage drop of the signal received by the second electrode of the light-emitting unit, which has a longer signal transmission distance with the power line 15, is larger, and the display is not uniform; by arranging the plurality of auxiliary lines 302, the auxiliary lines 302 can be made of metal materials, which is equivalent to increasing the thickness of the cathode layer 401, so that the resistance of the cathode layer 401 is reduced, and further, the signal received by the second electrode of the light-emitting unit with a longer signal transmission distance from the power line 15 is smaller than the signal received by the second electrode of the light-emitting unit with a shorter signal transmission distance from the power line 15, thereby weakening the phenomenon of uneven display and improving the display effect; in addition, the auxiliary line 302 is electrically connected to the power line 15, so that the signal transmission path can be increased, and the voltage difference between the parts of the cathode layer of the signal can be further reduced. Meanwhile, the auxiliary line 302 and the power line 15 can be arranged on the same layer, and the auxiliary line 302 and the power line 15 can be electrically connected on the same layer, so that the wiring difficulty is simplified, and the cost of the display panel is reduced. The SCAN circuit 152 and the EM circuit 151 of the display panel may be disposed in the non-display region 12 on both sides of the display region 11 along the first direction X, and the plurality of auxiliary lines 302 may be arranged along the first direction X and connected to the power line 15 at the lower step region 121, so as to prevent the auxiliary lines 302 from overlapping the SCAN circuit 152 and the EM circuit 151 to generate a signal crosstalk phenomenon, thereby improving the stability of the display panel. Preferably, the auxiliary lines 302 are uniformly distributed in the display area 11 and are not overlapped with the pixel driving circuit, so that the resistances of the cathode layer 401 are relatively uniform, the auxiliary lines 302 and the pixel driving circuit are prevented from signal crosstalk, and the working stability of the display panel is improved.
Through experimental verification, by using the power line to provide the initialization signal to the gate of the driving transistor in the pixel driving circuit, provide the initialization signal to the first electrode of the light emitting unit, and provide the negative level to the second electrode of the light emitting unit, fewer initialization signal lines can be arranged when the non-display area of the display panel is wired, and frames of 15 μm on the left side and the right side of the display panel can be reduced compared with the existing display panel.
The embodiment of the invention also provides a display device, and fig. 8 is a schematic structural diagram of the display device provided by the embodiment of the invention. As shown in fig. 8, the display device 20 includes the display panel 19 in the above embodiment, so that the display device provided in the embodiment of the present invention also has the beneficial effects described in the above embodiment, and further description is omitted here. Illustratively, the display device may be an electronic display device such as a mobile phone, a computer, or a television.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A display panel, comprising: a display area and a non-display area;
the display area is provided with a plurality of pixel driving circuits and a plurality of light-emitting units, each light-emitting unit comprises a first electrode and a second electrode, and the first electrode of each light-emitting unit is connected with one pixel driving circuit;
the non-display area is provided with a power line, and the second electrode of the light-emitting unit is connected with the power line;
the pixel driving circuit includes an initialization signal input terminal connected to the power line.
2. The display panel according to claim 1, wherein the pixel driving circuit includes a first switching transistor;
a first pole of the first switching transistor is electrically connected to the power line as the initialization signal input terminal, a second pole of the first switching transistor is connected to the first electrode of the light emitting unit, and a gate of the first switching transistor is electrically connected to the first scan line.
3. The display panel according to claim 1, wherein the pixel driving circuit includes a second switching transistor and a driving transistor;
a first pole of the second switching transistor is electrically connected to the power line as the initialization signal input terminal, a second pole of the second switching transistor is connected to the gate of the driving transistor, and the gate of the second switching transistor is connected to the second scan line.
4. The display panel according to claim 3, further comprising a data line, wherein the pixel driving circuit comprises a data signal input terminal electrically connected to the data line;
the power line and the data line are arranged on the same layer.
5. The display panel according to claim 1, wherein the power supply line is provided around the display region.
6. The display panel according to claim 5, wherein the display region is provided with a plurality of reference lines, the initialization signal input terminals are electrically connected to the corresponding reference lines, and the reference lines extend to the non-display region and are connected to the power supply lines.
7. The display panel according to claim 6, wherein the non-display region includes a lower step region, the display panel includes a plurality of auxiliary lines arranged in a first direction and extending in a second direction, the second electrodes of the light emitting cells constitute a whole layer of cathode layers connected to the auxiliary lines through via holes, and the auxiliary lines are connected to portions of the power supply lines located in the lower step region; wherein the first direction is perpendicular to the second direction.
8. The display panel according to claim 1, wherein the level value on the power supply line ranges from-5V to 0V.
9. The display panel according to claim 8, wherein the level value on the power supply line is-3V.
10. A display device characterized by comprising the display panel according to any one of claims 1 to 9.
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| CN201910885412.0A CN110599955B (en) | 2019-09-19 | 2019-09-19 | Display panel and display device |
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| CN201910885412.0A CN110599955B (en) | 2019-09-19 | 2019-09-19 | Display panel and display device |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111613656A (en) * | 2020-05-28 | 2020-09-01 | 维沃移动通信有限公司 | Display substrate, display device and mobile terminal |
| CN111668270A (en) * | 2020-06-11 | 2020-09-15 | 武汉华星光电半导体显示技术有限公司 | OLED display panel and OLED display device |
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| CN111613656B (en) * | 2020-05-28 | 2023-08-25 | 维沃移动通信有限公司 | Display substrate, display device and mobile terminal |
| CN111668270A (en) * | 2020-06-11 | 2020-09-15 | 武汉华星光电半导体显示技术有限公司 | OLED display panel and OLED display device |
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| CN111668270B (en) * | 2020-06-11 | 2022-07-29 | 武汉华星光电半导体显示技术有限公司 | OLED display panel and OLED display device |
| CN111986612A (en) * | 2020-08-31 | 2020-11-24 | 云谷（固安）科技有限公司 | Pixel driving circuit, driving method of pixel driving circuit and display panel |
| CN114627798A (en) * | 2020-11-27 | 2022-06-14 | 乐金显示有限公司 | Gate driving circuit and electroluminescent display device including the same |
| CN113257175B (en) * | 2021-05-11 | 2022-11-08 | Tcl华星光电技术有限公司 | Drive circuit, display panel and panel |
| CN113257175A (en) * | 2021-05-11 | 2021-08-13 | Tcl华星光电技术有限公司 | Drive circuit, display panel and panel |
| US11756478B2 (en) | 2021-05-11 | 2023-09-12 | Tcl China Star Optoelectronics Technology Co., Ltd. | Driving circuit, display panel, and panel |
| CN113745264A (en) * | 2021-08-19 | 2021-12-03 | 深圳市华星光电半导体显示技术有限公司 | Light-emitting substrate, backlight module and display panel |
| CN113745264B (en) * | 2021-08-19 | 2023-11-28 | 深圳市华星光电半导体显示技术有限公司 | Light-emitting substrate, backlight module and display panel |
| CN113972224A (en) * | 2021-10-21 | 2022-01-25 | 昆山国显光电有限公司 | Display panel and display device |
| CN113823671B (en) * | 2021-11-09 | 2023-10-31 | 昆山国显光电有限公司 | Display panel and display device |
| CN114241966B (en) * | 2021-12-08 | 2023-03-14 | 合肥维信诺科技有限公司 | Display panel and display device |
| CN114241966A (en) * | 2021-12-08 | 2022-03-25 | 合肥维信诺科技有限公司 | Display panel and display device |
| CN114882844B (en) * | 2022-05-18 | 2023-07-21 | 湖北长江新型显示产业创新中心有限公司 | Display panel and display device |
| CN114882844A (en) * | 2022-05-18 | 2022-08-09 | 湖北长江新型显示产业创新中心有限公司 | Display panel and display device |
| WO2024104109A1 (en) * | 2022-11-18 | 2024-05-23 | 华为技术有限公司 | Display apparatus |
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