CN114882816B

CN114882816B - Display panel and detection method thereof, and display device

Info

Publication number: CN114882816B
Application number: CN202210684073.1A
Authority: CN
Inventors: 吴晓晓
Original assignee: Xiamen Tianma Microelectronics Co Ltd
Current assignee: Xiamen Tianma Microelectronics Co Ltd
Priority date: 2022-06-16
Filing date: 2022-06-16
Publication date: 2025-01-14
Anticipated expiration: 2042-06-16
Also published as: CN114882816A

Abstract

The present invention discloses a display panel and a detection method thereof, and a display device. The display panel includes: a pixel, including at least one sub-pixel and at least one detection unit. The sub-pixel includes a light-emitting element. The detection unit is used to sense the temperature to determine whether the light-emitting element is damaged. By setting the detection unit in the pixel, it can be known whether the light-emitting element is heated when it is lit by sensing the temperature by the detection unit. It can effectively detect whether the light-emitting element is damaged, avoid judging the light-emitting element that is darkened due to threshold voltage drift as damaged, reduce consumables, save costs, accurately locate the position of the damaged light-emitting element, facilitate replacement of the damaged light-emitting element, and help improve the display effect of the display panel.

Description

Display panel, detection method thereof and display device

Technical Field

The invention relates to the technical field of display, in particular to a display panel, a detection method thereof and a display device.

Background

The light emitting diode (LIGHT EMITTING diode, LED) is a semiconductor diode capable of converting electric energy into light energy, and the Micro light emitting diode (Micro LIGHT EMITTING diode) is a light emitting diode with a size within 100 micrometers, and has the characteristics of small volume, high brightness, low energy consumption, independent control of light emission and the like, and is widely applied to the fields of display screens, illumination and the like.

After the Micro light emitting diode is manufactured, a large number of Micro light emitting diodes are required to be transferred onto an array substrate through a mass transfer process, so that Micro LED display panels with different sizes are formed. In the process of mass transfer, partial micro light emitting diodes are easily damaged due to pressure, alignment and other deviations, so that the display effect of the display panel is affected.

Therefore, detecting whether the bound micro diode is damaged is a technical problem to be solved.

Disclosure of Invention

In view of the above, the present invention provides a display panel, a detection method thereof, and a display device for detecting whether a bound light emitting element is damaged.

In one aspect, the present invention provides a display panel comprising a display region and a non-display region at least partially surrounding the display region;

The display area includes:

The pixel comprises at least one sub-pixel and at least one detection unit, wherein the sub-pixel comprises a light-emitting element, and the detection unit is used for sensing temperature to judge whether the light-emitting element is damaged or not.

In another aspect, the present invention provides a method for detecting a display panel, the display panel including:

A sub-pixel including a pixel driving circuit, the pixel driving circuit comprising:

the first power supply voltage signal end is used for providing a first power supply voltage;

the second power supply voltage signal end is used for providing a second power supply voltage;

The driving module and the light-emitting element are connected in series between the first power supply voltage signal end and the second power supply voltage signal end;

the detection unit is connected with the light-emitting element in parallel;

and when the light-emitting element is damaged to generate heat in the lighting state, the detection unit senses temperature, and a control current flows to the second power supply voltage signal end through the detection unit, so that the light-emitting element is short-circuited to be extinguished, and the damage position of the light-emitting element is confirmed.

In still another aspect, the present invention further provides a method for detecting a display panel, the display panel including a display region and a non-display region at least partially surrounding the display region;

The display area includes:

The pixel comprises at least one sub-pixel and at least one detection unit, wherein the sub-pixel comprises a light-emitting element, and the detection unit is a temperature sensor;

The driving chip is positioned in the non-display area, and the detection unit is electrically connected with the driving chip;

And the sub-pixels are lightened, the light-emitting element is damaged to generate heat in the lightened state, the temperature sensor senses temperature and feeds back the temperature to the driving chip, the driving chip reduces the voltage of a data signal transmitted to the light-emitting element, the brightness of the light-emitting element is darkened, and the damaged position of the light-emitting element is confirmed.

In yet another aspect, the present invention provides a display device including the above display panel.

Compared with the prior art, the display panel provided by the invention has the advantages that at least the following beneficial effects are realized:

The pixel comprises at least one sub-pixel and at least one detection unit, wherein the sub-pixel comprises a light-emitting element, the detection unit is used for sensing temperature to judge whether the light-emitting element is damaged, when the bound light-emitting element is lightened, if the light-emitting element is damaged or the light-emitting element is damaged due to poor binding of the light-emitting element, the light-emitting element can generate heat.

Of course, it is not necessary for any one product embodying the invention to achieve all of the technical effects described above at the same time.

Other features of the present invention and its advantages will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

FIG. 1 is a schematic view of a display panel according to the present invention;

FIG. 2 is a schematic view of another structure of a display panel according to the present invention;

FIG. 3 is a schematic view showing another structure of a display panel according to the present invention;

FIG. 4 is a schematic diagram of a pixel driving circuit according to the present invention;

FIG. 5 is a schematic diagram of another embodiment of a pixel driving circuit according to the present invention;

FIG. 6 is a layout diagram of a pixel driving circuit according to the present invention;

FIG. 7 is a cross-sectional view taken along the direction A-A' in FIG. 6;

FIG. 8 is another cross-sectional view taken along line A-A' of FIG. 6;

fig. 9 is a schematic diagram of still another structure of the pixel driving circuit according to the present invention;

FIG. 10 is another layout diagram of a pixel driving circuit according to the present invention;

FIG. 11 is a cross-sectional view taken in the direction B-B' of FIG. 10;

FIG. 12 is a schematic diagram of a pixel driving circuit according to the present invention;

FIG. 13 is another cross-sectional view taken along line C-C' of FIG. 12;

FIG. 14 is a schematic view showing another structure of a display panel according to the present invention;

FIG. 15 is a schematic view showing another structure of a display panel according to the present invention;

FIG. 16 is a schematic diagram of a pixel driving circuit according to another embodiment of the present invention;

FIG. 17 is a timing diagram provided by the present invention;

FIG. 18 is a flow chart provided by the present invention;

FIG. 19 is another flow chart provided by the present invention;

FIG. 20 is yet another flow chart provided by the present invention;

FIG. 21 is yet another flow chart provided by the present invention;

Fig. 22 is a schematic structural diagram of a display device according to the present invention.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.

The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.

It should be noted that like reference numerals and letters refer to like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

The invention provides a display panel, a detection method thereof and a display device. Embodiments of the display panel, the detection method thereof and the display device provided by the invention are described in detail below.

Referring to fig. 1 and 2, fig. 1 is a schematic structural view of a display panel according to the present invention, and fig. 2 is another schematic structural view of a display panel according to the present invention, a display panel 100 according to the present embodiment includes a display area DA and a non-display area NDA at least partially surrounding the display area DA;

The display area DA includes:

the pixel 01 comprises at least one sub-pixel 02 and at least one detection unit 03, wherein the sub-pixel 02 comprises a light emitting element 04, and the detection unit 03 is used for sensing temperature to judge whether the light emitting element 04 is damaged or not.

It should be noted that, fig. 1 only illustrates that one pixel 01 includes three sub-pixels 02 and one detection unit 03, fig. 2 only illustrates that one pixel 01 includes three sub-pixels 02 and three detection units 03, and of course, the number of sub-pixels 02, the number of detection units 03, and the arrangement of the sub-pixels 02 included in one pixel 01 may be adjusted according to the requirement, which is not limited in this embodiment. The sub-pixel 02 includes a light emitting area OA and a non-light emitting area NOA, the light emitting element 04 is located in the light emitting area OA, and in fig. 1 and 2, only the non-light emitting area NOA of the sub-pixel 02 is shown, but the present invention is not limited thereto, the detection unit 03 may be disposed in the light emitting area OA of the sub-pixel 02, or disposed between two adjacent sub-pixels 02, and may be adjusted according to the requirement, which is not limited in the present embodiment. In fig. 1 and fig. 2, only a rectangular display panel 100 is illustrated, however, the display panel 100 may be a rounded rectangular display panel 100, or the display panel 100 may be a special-shaped display panel 100, and the number of pixels 01 and the arrangement of the pixels 01 in the display panel 100 may be adjusted according to actual needs, which is not limited thereto. The light emitting element 04 may be a Micro LIGHT EMITTING diode (Micro LED) or a Mini LED (MINI LIGHT EMITTING diode).

It can be understood that the dimming of the light emitting element 04 may be caused by a threshold voltage drift, or may be caused by damage to the light emitting element 04, where the damage to the light emitting element 04 may have a defect when the light emitting element 04 is manufactured, or may cause the damage to the light emitting element 04 due to deviation in transferring and binding, the damaged light emitting element 04 may seriously generate heat when being lightened, and at least one detecting unit 03 is provided in the pixel 01 for sensing a temperature to determine whether the light emitting element 04 is damaged, so that the darkened light emitting element 04 can be discriminated, the damaged light emitting element 04 can be accurately found and positioned, the subsequent replacement is facilitated, and the display effect is improved.

Compared with the prior art, the display panel 100 provided in this embodiment has at least the following advantages:

The pixel 01 comprises at least one sub-pixel 02 and at least one detection unit 03, wherein the sub-pixel 02 comprises a light emitting element 04, the detection unit 03 is used for sensing temperature to judge whether the light emitting element 04 is damaged, if the light emitting element 04 is damaged by the light emitting element 04 itself or the light emitting element 04 is damaged due to poor binding of the light emitting element 04 when the light emitting element 04 is lightened, the light emitting element 04 can generate heat, and the detection unit 03 is arranged in the pixel 01, so that whether the light emitting element 04 generates heat when the light emitting element 04 is lightened can be judged to be damaged or not through sensing the temperature by the detection unit 03, the situation that whether the light emitting element 04 is damaged or not can be avoided, the darkened light emitting element 04 caused by threshold voltage drift is judged to be damaged, consumable is reduced, cost is saved, the position of the damaged light emitting element 04 is accurately positioned, the damaged light emitting element 04 is conveniently replaced, and the display effect of the display panel 100 is facilitated.

In some alternative embodiments, referring to fig. 3 and 4, fig. 3 is a schematic diagram of still another structure of a display panel provided by the present invention, and fig. 4 is a schematic diagram of a structure of a pixel driving circuit provided by the present invention, where a sub-pixel 02 includes a pixel driving circuit 200, and the pixel driving circuit 200 includes:

the first power supply voltage signal end PVDD is used for providing a first power supply voltage;

a second supply voltage signal terminal PVEE for providing a second supply voltage;

the driving module 05 and the light-emitting element 04 are connected in series between the first power supply voltage signal end PVDD and the second power supply voltage signal end PVEE;

the detection unit 03 is connected in parallel with the light emitting element 04.

It should be noted that, in fig. 3, only the pixel driving circuit 200 and the detecting unit 03 are shown in the non-light emitting area NOA of the sub-pixel 02, and the front projection of the pixel driving circuit 200 on the light emitting surface of the display panel 100 and the front projection of the detecting unit 03 on the light emitting surface of the display panel 100 at least partially overlap, which is not limited to this, and the positions of the pixel driving circuit 200 and the detecting unit 03 may be adjusted according to actual requirements. The operation phases of the pixel driving circuit 200 include a reset phase T1, a data writing phase T2, and a light emitting phase T3, and in fig. 4, only the pixel driving circuit 200 is illustrated as including a first power voltage signal terminal PVDD, a second power voltage signal terminal PVEE, a driving module 05, a light emitting element 04, and a detecting unit 03, the driving module 05 is configured to generate a light emitting driving current in the light emitting phase T3, the driving module 05 includes a driving transistor M0, and the detecting unit 03 is configured to sense a temperature to determine whether the light emitting element 04 is damaged; the pixel driving circuit 200 further includes a first reset module 06, a second reset module 07, a capacitor 08, a data writing module 09, a threshold compensation module 10, and a light emission control module 11, where the first reset module 06 is configured to reset the driving module 05 in a reset phase T1, the second reset module 07 is configured to reset the light emitting element 04 in a reset phase T1, the capacitor 08 is configured to maintain a potential of a control terminal of the driving module 05, the data writing module 09 is configured to write a data signal into the control terminal of the driving module 05 in a data writing phase T2, the threshold compensation module 10 is configured to compensate the control terminal of the driving module 05, the light emission control module 11 is configured to control the light emitting element 04 to emit light, the light emission control module 11 includes a second transistor M2 and a third transistor M3, the second transistor M2 is located between the driving module 05 and the light emitting element 04, the third transistor M3 is located between the first power voltage signal terminal PVDD and the driving module 05, and the first reset module 06, the second reset module 07, the data writing module 09, and the threshold compensation module 10 are configured to compensate the control terminal of the driving module 05 in the data writing the data signal into the control terminal of the driving module 05 in the data writing phase T2, and the light emission control module 11 is configured to emit light by the specific pixel 200.

It can be understood that the driving module 05 is reset in the reset stage T1 to avoid the dimming of the light emitting element 04 caused by the drift of the threshold voltage of the driving module 05, the data signal is written into the control end of the driving module 05 in the data writing stage T2, the current flows to the second power voltage signal end PVEE through the first power voltage signal end PVDD in the light emitting stage T3, the light emitting element 04 is located between the first power voltage signal end PVDD and the second power voltage signal end PVEE, if the light emitting element 04 is not damaged, the current can flow through the light emitting element 04 to make the light emitting element 04 normally emit light, if the light emitting element 04 is damaged, the damaged light emitting element 04 is heated seriously when being lighted, the detection unit 03 connected in parallel with the light emitting element 04 senses the temperature, when the detection unit 03 senses the temperature is higher, optionally, the resistance of the branch where the detection unit 03 is located is reduced, the current which is extinguished by the first power voltage signal end PVDD flows to the second power voltage signal end PVEE through the detection unit 03, the light emitting element 04 is extinguished by short circuit, the position of the light emitting element 04 can be found out through the light emitting element 04, the damaged light emitting element 04 can be replaced rapidly, the light emitting element 04 is prevented from being damaged, the cost is reduced, the cost of replacing the damaged light emitting element 04 is avoided, and the light emitting element 04 is reduced, and the cost is lowered, and the cost of the light emitting element is lowered, and the cost is reduced due to the change of the cost is caused by the drift voltage.

In some alternative embodiments, referring to fig. 5, fig. 5 is another schematic structural diagram of a pixel driving circuit provided by the present invention, and the detecting unit 03 includes a temperature sensing device 12 and a control module 13;

The first end of the control module 13 is electrically connected with the anode of the light-emitting element 04, the second end of the control module 13 is electrically connected with the temperature sensing device 12, and the control end of the control module 13 is electrically connected with the test signal end VTsw;

One end of the temperature sensing device 12 is electrically connected to the second end of the control module 13, and the other end is electrically connected to the cathode of the light emitting element 04.

It will be appreciated that in fig. 5, only the temperature sensing device 12 is illustrated in series with the control module 13, the first end of the control module 13 is electrically connected to the anode of the light emitting element 04, and one end of the temperature sensing device 12 is electrically connected to the cathode of the light emitting element 04, but is not limited thereto. The temperature sensing device 12 is arranged corresponding to the light emitting element 04, when the light emitting element 04 is lightened, the temperature sensing device 12 senses the temperature of the light emitting element 04, when the temperature sensing device 12 senses the temperature to exceed a preset threshold value, current passes through a branch where the temperature sensing device 12 is located, otherwise, when the temperature sensing device 12 senses the temperature to not exceed the preset threshold value, namely, the light emitting element 04 is not damaged, the current passes through the branch where the light emitting element 04 is located, the temperature sensing device 12 is directly connected with the light emitting element 04 in parallel, the effect of short-circuiting the light emitting element 04 when the temperature is higher can be achieved, and the control module 13 is connected with the temperature sensing device 12 in series, so that the branch where the temperature sensing device 12 is located can be controlled.

In some alternative embodiments, with continued reference to fig. 5, the control module 13 includes a first transistor M1, a first pole of the first transistor M1 is electrically connected to the anode of the light emitting element 04, a second pole of the first transistor M1 is electrically connected to the temperature sensing device 12, and a gate of the first transistor M1 is electrically connected to the test signal terminal VTsw.

It can be understood that, in the light emitting stage T3, if the light emitting element 04 is damaged, the temperature sensing device 12 corresponding to the light emitting element 04 senses that the temperature exceeds the preset threshold, so that the current passes through the branch where the temperature sensing device 12 is located, at this time, the first transistor M1 is not turned on, the current flowing out of the first power voltage signal terminal PVDD still flows to the second power voltage signal terminal PVEE through the light emitting element 04, when the test signal terminal VTsw transmits the test signal to the gate of the first transistor M1, the first transistor M1 is turned on in response to the test signal, at this time, the current flowing out of the first power voltage signal terminal PVDD flows to the second power voltage signal terminal PVEE through the temperature sensing device 12, so that the light emitting element 04 is short-circuited and turned off, the temperature sensing device 12 is set to accurately and quickly find the damaged light emitting element 04, and the first transistor M1 is set to control the detection process of the light emitting element 04.

In some alternative embodiments, referring to fig. 6 and 7, fig. 6 is a layout diagram of a pixel driving circuit provided in the present invention, fig. 7 is a cross-sectional view of a direction A-A' in fig. 6, and the display panel 100 provided in this embodiment further includes:

A substrate 14;

the device layer 15 is positioned on one side of the substrate 14, the device layer 15 is provided with the control module 13, and the temperature sensing device 12 is arranged on one side of the device layer 15 away from the substrate 14;

an insulating layer 16 on a side of the device layer 15 remote from the substrate 14;

the light-emitting layer 17 is located on a side of the insulating layer 16 away from the device layer 15, and the light-emitting layer 17 is provided with the light-emitting element 04.

Note that, in fig. 7, only the temperature sensing device 12 is illustrated as being located between the device layer 15 and the light emitting layer 17, and for convenience of viewing, the insulating film layer and the insulating layer 16 in the substrate 14 and the device layer 15 are not pattern-filled in fig. 7, but the temperature sensing device 12 is not limited thereto, and may be the same layer as the light emitting element 04, or another film layer may be included between the device layer 15 and the light emitting layer 17, and the temperature sensing device 12 may be disposed between these film layers. The substrate 14 may be a rigid substrate or a flexible substrate, and when the substrate 14 is a rigid substrate, the substrate 14 may be made of glass, transparent resin, or the like, and when the substrate 14 is a flexible substrate, the substrate 14 may be made of polycarbonate, polyimide, or the like. The device layer 15 includes a gate metal layer, a source-drain metal layer, an active layer, and film layers between the respective conductive film layers, and the device layer 15 can be used to control whether the light emitting element 04 of the light emitting layer 17 emits light.

It can be appreciated that the control module 13 is disposed on the device layer 15, the temperature sensing device 12 is disposed on a side of the device layer 15 away from the substrate 14, and the control module 13 and the temperature sensing device 12 are disposed by using the existing film layer, so that no additional film layer is required, the thickness of the display panel 100 is prevented from being increased, and the light and thin display panel 100 is facilitated.

In some alternative embodiments, with continued reference to FIGS. 5 and 7, the pixel driving circuit 200 further includes a second transistor M2 disposed between the driving module 05 and the light emitting element 04, a first electrode of the second transistor M2 being electrically connected to the driving module 05, a second electrode of the second transistor M2 being electrically connected to an anode of the light emitting element 04, a gate of the second transistor M2 being electrically connected to the light emitting signal control terminal EMIT, the second transistor M2 being disposed in the device layer 15;

the gate of the first transistor M1 is co-layered with the gate of the second transistor M2, the first pole of the first transistor M1, the second pole of the first transistor M1, the first pole of the second transistor M2 and the second pole of the second transistor M2 are co-layered, and the semiconductor layer of the first transistor M1 is co-layered with the semiconductor layer of the second transistor M2.

It should be understood that fig. 7 only illustrates the first transistor M1 and the second transistor M2 as being in the same layer, and that the first transistor M1 and the second transistor M2 may be provided in different layers, which is not limited thereto. When the gate of the first transistor M1 and the gate of the second transistor M2 are in the same layer, the same process can be used to obtain the transistor, thereby simplifying the process and reducing the cost. Similarly, the first electrode of the first transistor M1, the second electrode of the first transistor M1, the first electrode of the second transistor M2 and the second electrode of the second transistor M2 are arranged, and the semiconductor layer of the first transistor M1 and the semiconductor layer of the second transistor M2 are arranged in the same layer, so that the process can be simplified, and the cost can be reduced. When the same process is adopted, the thickness of the grid electrode of the first transistor M1 is equal to that of the grid electrode of the second transistor M2, the thicknesses of the source electrode and the drain electrode of the first transistor M1 are equal to those of the source electrode and the drain electrode of the second transistor M2, the thicknesses of the semiconductor layer of the first transistor M1 and the semiconductor layer of the second transistor M2 are equal, and the manufacture of the grid electrode metal layer, the source electrode and the drain electrode metal layer and the film layer between the active layers is facilitated.

In some alternative embodiments, referring to fig. 6, 7 and 8, fig. 8 is another cross-sectional view taken along the direction A-A' in fig. 6, with temperature sensing device 12 positioned between light emitting layer 17 and device layer 15, or with temperature sensing device 12 being co-located with light emitting layer 17.

It should be understood that fig. 7 only illustrates that the temperature sensing device 12 is located between the light emitting layer 17 and the device layer 15, and of course, if other film layers are further included between the light emitting layer 17 and the device layer 15, the temperature sensing device 12 may be disposed between the film layers, which is not limited in this embodiment. In fig. 8, for convenience of viewing, the insulating film layer and the insulating layer 16 in the substrate 14 and the device layer 15 are not filled with patterns, specifically, when the temperature sensing device 12 and the light emitting element 04 are co-layered, the front projection of the temperature sensing device 12 on the substrate 14 and the front projection of the light emitting element 04 on the substrate 14 are not overlapped, the temperature sensing device 12 is located in the non-light emitting area NOA of the sub-pixel 02, when the temperature sensing device 12 is located between the light emitting layer 17 and the device layer 15, the front projection of the temperature sensing device 12 on the substrate 14 and the front projection of the light emitting element 04 on the substrate 14 can be at least partially overlapped, the position of the temperature sensing device 12 can be adjusted according to requirements, and when the temperature sensing device 12 is located in the original film layer of the display panel 100, the thickness of the display panel 100 is not increased by setting the temperature sensing device 12, which is helpful for realizing the light and thin display panel 100.

In some alternative embodiments, referring to fig. 9, fig. 9 is a schematic diagram of still another structure of a pixel driving circuit provided in the present invention, and the detecting unit 03 includes a temperature sensing device 12 and a control module 13;

the first end of the control module 13 is electrically connected with the anode of the light-emitting element 04, the second end of the control module 13 is electrically connected with the cathode of the light-emitting element 04, and the control end of the control module 13 is electrically connected with the temperature sensing device 12;

one end of the temperature sensing device 12 is electrically connected with the control end of the control module 13, and the other end is electrically connected with the test signal end VTsw.

It will be understood that in fig. 9, only the temperature sensing device 12 is shown in series with the control module 13, the first end of the control module 13 is electrically connected with the anode of the light emitting element 04, the second end of the control module 13 is electrically connected with the cathode of the light emitting element 04, that is, the control module 13 is parallel to the light emitting element 04, the control module 13 is equivalent to a switch, when the control module 13 is turned on, the current flowing from the first power voltage signal end PVDD flows to the second power voltage signal end PVEE through the control module 13 to short-circuit the light emitting element 04 and turn off, and when the control module 13 is turned off, the current flowing from the first power voltage signal end PVDD flows to the second power voltage signal end PVEE through the light emitting element 04 to emit light. In order to effectively detect whether the light emitting element 04 is damaged, a temperature sensing device 12 is arranged between the control end of the control module 13 and the test signal end VTsw, when the light emitting element 04 emits heat seriously when being lighted, the temperature sensing device 12 conducts the test signal end VTsw with the control end of the control module 13, so that a test signal of the test signal end VTsw can be transmitted to the control end of the control module 13, the control module 13 is conducted to short-circuit the light emitting element 04, if the light emitting element 04 does not emit heat seriously when being lighted, the temperature sensing device 12 blocks the test signal of the test signal end VTsw from being transmitted to the control end of the control module 13, and the control module 13 is conducted or disconnected through the temperature sensing device 12 to detect the damaged light emitting element 04, so that the darkened light emitting element 04 caused by threshold voltage drift is prevented from being judged to be damaged, consumable materials are reduced, and cost is saved.

In some alternative embodiments, with continued reference to fig. 9, the control module 13 includes a first transistor M1, a first pole of the first transistor M1 is electrically connected to the anode of the light emitting element 04, a second pole of the first transistor M1 is electrically connected to the cathode of the light emitting element 04, and a gate of the first transistor M1 is electrically connected to the temperature sensing device 12.

It can be understood that the first transistor M1 is turned on in response to the test signal provided by the test signal terminal VTsw, the temperature sensing device 12 is located between the gate of the first transistor M1 and the test signal terminal VTsw, if the light emitting element 04 is damaged, the light emitting element 04 will generate heat seriously, when the temperature sensed by the temperature sensing device 12 corresponding to the light emitting element 04 exceeds the preset threshold, the gate of the first transistor M1 is turned on to the test signal terminal VTsw, i.e. a path is formed between the gate of the first transistor M1 and the test signal terminal VTsw, the test signal provided by the test signal terminal VTsw can be transmitted to the gate of the first transistor M1, the first transistor M1 is turned on in response to the test signal, and the light emitting element 04 is short-circuited, if the light emitting element 04 is normal, the normal light emitting element 04 will not generate heat seriously, and the temperature sensed by the temperature sensing device 12 does not exceed the preset threshold, the test signal terminal VTsw is blocked from transmitting the test signal to the gate of the first transistor M1, i.e. the gate of the first transistor M1 is turned off to the test signal terminal VTsw, the light emitting element 04 is turned off by the temperature sensing device 12, the control module 13 is turned on to detect the light emitting element 04 is damaged or the light emitting element 04 is damaged rapidly and the light emitting element 04 is damaged, and the light is damaged and the light emitting element is found accurately.

In some alternative embodiments, referring to fig. 10 and 11, fig. 10 is another layout diagram of a pixel driving circuit provided in the present invention, fig. 11 is a cross-sectional view of a direction B-B' in fig. 10, and the display panel 100 provided in this embodiment further includes:

A substrate 14;

a device layer 15 located on one side of the substrate 14, the device layer 15 being provided with a control module 13;

The light-emitting layer 17 is located on the side of the insulating layer 16 away from the device layer 15, the light-emitting layer 17 is provided with a light-emitting element 04, and the temperature sensing device 12 is located between the substrate 14 and the light-emitting layer 17.

It should be understood that, in fig. 11, only the control module 13 is illustrated as the first transistor M1, for convenience of viewing, in fig. 11, the insulating film layer and the insulating layer 16 in the substrate 14 and the device layer 15 are not filled with patterns, the first transistor M1 is in a top gate structure, the temperature sensing device 12 is located between the device layer 15 and the light emitting layer 17, and of course, if other film layers are included between the insulating layer 16 and the light emitting layer 17, the temperature sensing device 12 may be disposed between the film layers, and if the first transistor M1 is in a bottom gate structure, the structure of the temperature sensing device 12 may be adjusted along with the position of the gate of the first transistor M1, which is not limited specifically, and by the existing film layers, the control module 13 and the temperature sensing device 12 do not need to be additionally disposed, so that the thickness of the display panel 100 is prevented from being increased, and the light and thin display panel 100 is facilitated.

In some alternative embodiments, with continued reference to FIGS. 9, 10 and 11, the pixel driving circuit 200 further includes a second transistor M2 located between the driving module 05 and the light emitting element 04, a first electrode of the second transistor M2 being electrically connected to the driving module 05, a second electrode of the second transistor M2 being electrically connected to an anode of the light emitting element 04, a gate of the second transistor M2 being electrically connected to the light emitting signal control terminal EMIT;

The second transistor M2 is located in the device layer 15, the gate of the first transistor M1 is in the same layer as the gate of the second transistor M2, the first pole of the first transistor M1, the second pole of the first transistor M1, the first pole of the second transistor M2 and the second pole of the second transistor M2 are in the same layer as the semiconductor layer of the second transistor M2.

It should be understood that fig. 11 only illustrates the first transistor M1 and the second transistor M2 as being in the same layer, but it is needless to say that different layers of the first transistor M1 and the second transistor M2 may be provided, and the present invention is not limited thereto. When the gate of the first transistor M1 and the gate of the second transistor M2 are in the same layer, the same process can be used to obtain the transistor, thereby simplifying the process and reducing the cost. Similarly, the first electrode of the first transistor M1, the second electrode of the first transistor M1, the first electrode of the second transistor M2 and the second electrode of the second transistor M2 are arranged, and the semiconductor layer of the first transistor M1 and the semiconductor layer of the second transistor M2 are arranged in the same layer, so that the process can be simplified, and the cost can be reduced. When the same process is adopted, the thickness of the grid electrode of the first transistor M1 is equal to that of the grid electrode of the second transistor M2, the thicknesses of the source electrode and the drain electrode of the first transistor M1 are equal to those of the source electrode and the drain electrode of the second transistor M2, the thicknesses of the semiconductor layer of the first transistor M1 and the semiconductor layer of the second transistor M2 are equal, and the manufacture of the grid electrode metal layer, the source electrode and the drain electrode metal layer and the film layer between the active layers is facilitated.

In some alternative embodiments, with continued reference to fig. 10, 11, 12 and 13, fig. 12 is a layout of a pixel driving circuit provided in the present invention, and fig. 13 is another cross-sectional view taken along line C-C' in fig. 12, where the temperature sensing device 12 is located between the light emitting layer 17 and the gate of the first transistor M1, or where the temperature sensing device 12 is located between the gate of the first transistor M1 and the substrate 14.

It will be understood that, in fig. 11, only the temperature sensing device 12 is illustrated as being located between the device layer 15 and the light emitting layer 17, however, if the first transistor M1 is of a top gate structure, the temperature sensing device 12 may be located at any position between the light emitting layer 17 and the gate of the first transistor M1, in fig. 13, only the first transistor M1 is illustrated as being of a bottom gate structure, in order to facilitate viewing, in fig. 13, the insulating film layer and the insulating layer 16 in the device layer 15 are not patterned and filled, in addition, a buffer layer 24 is further included between the gate of the first transistor M1 and the substrate 14, the temperature sensing device 12 is electrically connected with the gate of the first transistor M1 between the buffer layer 24 and the substrate 14, and, in addition, if other film layers are further included between the gate of the first transistor M1 and the substrate 14, the temperature sensing device 12 may also be disposed between these film layers, and the position of the temperature sensing device 12 may be adjusted according to practical requirements, even if the temperature sensing device 12 and the gate of the first transistor M1 are disposed on the same layer, which is not limited in this embodiment. By arranging the control module 13 and the temperature sensing device 12 with the existing film, no additional film is required, so that the thickness of the display panel 100 is prevented from being increased, and the display panel 100 is light and thin.

In some alternative embodiments, with continued reference to fig. 6, 7, 8, 10, 11, and 13, the temperature sensing device 12 is a thermistor.

It is understood that a thermistor is a sensor resistor whose resistance value changes with a change in temperature. The thermistor comprises a positive temperature coefficient thermistor and a negative temperature coefficient thermistor, the resistance value of the positive temperature coefficient thermistor increases along with the temperature rise, the resistance value of the negative temperature coefficient thermistor decreases along with the temperature rise, the thermistor in the embodiment is preferably the negative temperature coefficient thermistor, when the light emitting element 04 emits light normally, the heat is not seriously generated, namely, the resistance value of the thermistor is not seriously reduced, current flows to the second power supply voltage signal end PVEE through the light emitting element 04 and does not short-circuit the light emitting element 04, if the light emitting element 04 is damaged, the light emitting element 04 emits heat seriously when being lighted, the temperature of the thermistor rises and the resistance value is seriously reduced, so that current flows to the second power supply voltage signal end PVEE through the detection unit 03, the light emitting element 04 is short-circuited and extinguished, the damaged light emitting element 04 is quickly and accurately found, the damaged light emitting element 04 is conveniently replaced, and the display effect of the display panel 100 is facilitated.

In some alternative embodiments, referring to fig. 14 and 15, fig. 14 is a schematic view of another structure of a display panel provided by the present invention, and fig. 15 is a schematic view of another structure of a display panel provided by the present invention, a detection unit 03 is a temperature sensor, a driving chip 18 located in a non-display area NDA, and a signal transmission line 19 having one end electrically connected to the driving chip 18 and the other end electrically connected to the detection unit 03.

It will be understood that in fig. 14, only one pixel 01 is illustrated, the number of temperature sensing devices 12 is smaller than the number of sub-pixels 02, that is, at least two sub-pixels 02 share one temperature sensing device 12, and in fig. 15, only one pixel 01 is illustrated, the number of temperature sensing devices 12 is equal to the number of sub-pixels 02, that is, the number of temperature sensing devices 12 corresponds to the sub-pixels 02 one by one. In fig. 14 and 15, only the non-light-emitting area NOA of the sub-pixel 02 is illustrated, that is, the light-emitting element 04 may be located between any film layers of the display panel 100 or located in the light-emitting layer 17, for example, the temperature sensor is located in the same layer as the light-emitting element 04 or located between the device layer 15 and the light-emitting layer 17, so long as the temperature of the light-emitting element 04 can be accurately sensed, and of course, if the temperature sensor is located between the light-emitting layer 17 and the substrate 14, the front projection of the temperature sensor on the substrate 14 may at least partially overlap with the front projection of the light-emitting element 04 on the substrate 14, and the position of the temperature sensor is not limited in this embodiment. The temperature sensor is a sensor capable of sensing temperature and converting the temperature into a usable output signal, if the light emitting element 04 is damaged, the light emitting element 04 will generate serious heat when the light emitting element 04 is lighted, the temperature sensor senses the temperature and feeds the temperature back to the driving chip 18 through the signal transmission line 19, the driving chip 18 receives abnormal temperature, the voltage of the data signal is reduced, the damaged light emitting element 04 is seriously darkened, and the damaged light emitting element 04 is detected.

In some alternative embodiments, with continued reference to fig. 14 and 16, fig. 16 is a schematic diagram of still another structure of the pixel driving circuit 200 provided in the present invention, and fig. 17 is a timing diagram provided in the present invention, where the pixel 01 includes at least two sub-pixels 02 and a detection unit 03.

In fig. 14, only the first sub-pixel 20, the second sub-pixel 21, the third sub-pixel 22 and one detection unit 03 are included in the pixel 01, the first sub-pixel 20, the second sub-pixel 21 and the third sub-pixel 22 are sequentially arranged along the first direction, the detection unit 03 is located in the second sub-pixel 21, the distance between the detection unit 03 and the first sub-pixel 20 is M, the distance between the detection unit 03 and the third sub-pixel 22 is N, the difference between M and N is small, the second sub-pixel 21 includes a center line extending along the second direction, and if the center of the detection unit 03 is located on the center line, the effect of sensing temperature can be better because m=n. Of course, the position of the detecting unit 03 may be adjusted according to the requirement, and the detecting unit 03 may be located in the first sub-pixel 20 or in the third sub-pixel 22, or may be located between two adjacent sub-pixels 02, which is not particularly limited in this embodiment, as long as the detecting unit 03 can accurately sense the temperature of the sub-pixels 02 during lighting.

It will be appreciated that, in fig. 14, the first sub-pixel 20, the second sub-pixel 21 and the third sub-pixel 22 are also illustrated as being sequentially arranged along the first direction, in order for the first sub-pixel 20, the second sub-pixel 21 and the third sub-pixel 22 to share one detection unit 03, the first sub-pixel 20, the second sub-pixel 21 and the third sub-pixel 22 need to be time-divisionally driven, specifically, a signal control line 23, a fourth transistor M4, a fifth transistor M5 and a sixth transistor M6 are provided in the non-display area NDA, and the signal control line 23 includes a first signal control line CKH1, The second signal control line CKH2 and the third signal control line CKH3, one end of the data line electrically connected to the first sub-pixel 20 is electrically connected to the first pole of the fourth transistor M4, the second pole of the fourth transistor M4 is electrically connected to the driving chip 18, the gate of the fourth transistor M4 is electrically connected to the first signal control line CKH1, one end of the data line electrically connected to the second sub-pixel 21 is electrically connected to the first pole of the fifth transistor M5, the second pole of the fifth transistor M5 is electrically connected to the driving chip 18, the gate of the fifth transistor M5 is electrically connected to the second signal control line CKH2, one end of the data line electrically connected to the third sub-pixel 22 is electrically connected to the first pole of the sixth transistor M6, the second pole of the sixth transistor M6 is electrically connected to the driving chip 18, the gate of the sixth transistor M6 is electrically connected to the third signal control line CKH3, the pixel driving circuit 200 includes only the first power supply voltage signal end PVDD in FIG. 16, A second power voltage signal terminal PVEE, a driving module 05, a light-emitting element 04, a first reset module 06, a second reset module 07, a capacitor 08, a data writing module 09, The threshold compensation module 10 and the light-emitting control module 11, the driving module 05 is used for generating light-emitting driving current in the light-emitting stage T3, the detecting unit 03 is used for sensing temperature to judge whether the light-emitting element 04 is damaged, the first reset module 06 is used for resetting the driving module 05 in the reset stage T1, the second reset module 07 is used for resetting the light-emitting element 04 in the reset stage T1, the control ends of the first reset module 06 and the second reset module 07 are electrically connected with the first scanning line S1, one end of the first reset module 06 is electrically connected with the first reset signal end Vref1, the other end is electrically connected with the driving module 05, one end of the second reset module 07 is electrically connected with the second reset signal end Vref2, the other end is electrically connected with the anode of the light-emitting element 04, the capacitor 08 is used for maintaining the potential of the control end of the driving module 05, the data writing module 09 is configured to write a data signal into the control end of the driving module 05 in the data writing stage T2, the control end of the data writing module 09 is electrically connected to the second scan line S2, one end of the data writing module 09 is electrically connected to the driving module 05, the other end is electrically connected to the data line, the threshold compensation module 10 is configured to compensate the control end of the driving module 05, the light emitting control module 11 is configured to control the light emitting element 04 to emit light, the control end of the light emitting control module 11 is electrically connected to the light emitting signal end, the light emitting control module 11 includes a second transistor M2 and a third transistor M3, the second transistor M2 is located between the driving module 05 and the light emitting element 04, and the third transistor M3 is located between the first power voltage signal end PVDD and the driving module 05, in this embodiment, only a specific structure of the pixel driving circuit 200 is illustrated, but not limited thereto. The working phase of the pixel driving circuit 200 includes a reset phase T1, a data writing phase T2 and a light emitting phase T3, in the reset phase T1, the first scan line S1 transmits a first scan signal, the control end of the first reset module 06 is turned on in response to the first scan signal, so that the first reset signal provided by the first reset signal end Vref1 is transmitted to the driving module 05 to reset the driving module 05, and the control end of the second reset module 07 is turned on in response to the first scan signal, so that the second reset signal is transmitted to the anode of the light emitting element 04 to reset the anode of the light emitting element 04. In the data writing stage T2, the second scan line S2 provides a second scan signal, and the control terminal of the data writing module 09 is turned on in response to the second scan signal, so that the data transmitted by the data line is written into the control terminal of the driving module 05. referring to fig. 17, taking one pixel 01 as an example, in the light emitting stage T3, the light emitting control module 11 responds to the light emitting signal provided by the light emitting signal end to turn on the first power voltage signal end PVDD to the second power voltage signal end PVEE, at this time, the first signal control line CKH1, the second signal control line CKH2 and the third signal control line CKH3 sequentially provide control signals to sequentially turn on the fourth transistor M4, the fifth transistor M5 and the sixth transistor M6, that is, the data line electrically connected to the first sub-pixel 20 firstly transmits the data signal, the data line electrically connected to the second sub-pixel 21 transmits the data signal, and finally, the data line electrically connected to the third sub-pixel 22 transmits the data signal, thereby making the first sub-pixel 20, the second sub-pixel 21 and the third sub-pixel 22 are driven in a time-sharing manner, and the detecting unit 03 determines whether the first sub-pixel 20, the second sub-pixel 21 and the third sub-pixel 22 are damaged, respectively.

In some alternative embodiments, with continued reference to fig. 1, fig. 4, and fig. 18, fig. 18 is a flowchart provided by the present invention, and based on the same concept of the foregoing embodiments, the present embodiment provides a method for detecting a display panel, where the display panel 100 includes:

a sub-pixel 02, the sub-pixel 02 including a pixel driving circuit 200, the pixel driving circuit 200 including:

the detection unit 03 is connected in parallel with the light-emitting element 04;

S101, lighting a sub-pixel 02;

In S102, when the light-emitting element 04 is damaged and generates heat in the lighted state, the detection unit 03 senses temperature, and a control current flows to the second power voltage signal terminal PVEE through the detection unit 03, so that the light-emitting element 04 is short-circuited and extinguished, and the damaged position of the light-emitting element 04 is confirmed.

It can be understood that the damaged light emitting element 04 includes the light emitting element 04 having defects itself at the time of manufacture and the light emitting element 04 damaged due to transfer and binding, only the damaged light emitting element 04 is not only darkened in brightness but also heated seriously when lighted, the damaged light emitting element 04 is short-circuited by sensing temperature by the detection unit 03, resulting in extinction of the damaged light emitting element 04, the damaged light emitting element 04 can be found accurately and quickly, replacement is facilitated, the darkened light emitting element 04 caused by threshold voltage drift can be prevented from being judged to be damaged, consumable materials can be reduced, and cost can be saved.

In some alternative embodiments, with continued reference to fig. 5 and 19, fig. 19 is another flow chart provided by the present invention, the detection unit 03 includes a temperature sensing device 12 and a control module 13;

One end of the temperature sensing device 12 is electrically connected with the second end of the control module 13, the other end of the temperature sensing device 12 is electrically connected with the cathode of the light-emitting element 04, and the temperature sensing device 12 is a thermistor;

S201, illuminating a sub-pixel 02;

s202, in the lighting state, when the light-emitting element 04 is damaged to generate heat, the control end of the control module 13 is conducted in response to the test signal provided by the test signal end VTsw;

s203, the thermistor senses the temperature rise and the resistance value is reduced, and current flows to the second power supply voltage end through the control module 13 and the thermistor, so that the light-emitting element 04 is short-circuited and extinguished, and the damaged position of the light-emitting element 04 is confirmed.

It will be appreciated that directly connecting the temperature sensing device 12 in parallel with the light emitting element 04 has the effect of shorting the light emitting element 04 at higher temperatures, but does not control the process of detection. The control end of the control module 13 is electrically connected with the test signal end VTsw, when the test signal end VTsw provides a test signal, the control module 13 is turned on in response to the test signal, the control module 13 is connected with the temperature sensing device 12 in series, the branch where the temperature sensing device 12 is located can be controlled by controlling the opening of the control module 13 through the test signal, in the detection process, the test signal end VTsw provides the test signal to enable the control module 13 to be turned on, the thermistor senses the temperature of the light emitting element 04, if the light emitting element 04 is damaged, the temperature of the light emitting element 04 continuously rises when the light emitting element 04 is lightened, the temperature of the thermistor correspondingly arranged with the light emitting element 04 continuously rises, the resistance value continuously falls, and current can flow to the second power supply voltage signal end PVEE through the thermistor, namely, the current flowing from the first power supply voltage signal end PVDD flows to the second power supply voltage signal end PVEE through the detection unit 03, the light emitting element 04 is short-circuited, the light emitting element 04 is extinguished, and the damaged light emitting element 04 can be found out rapidly and accurately through the position of the light emitting element 04.

In some alternative embodiments, referring to fig. 9 and 20, fig. 20 is a further flowchart provided by the present invention, and the detection unit 03 includes a temperature sensing device 12 and a control module 13;

One end of the temperature sensing device 12 is electrically connected with the control end of the control module 13, the other end of the temperature sensing device 12 is electrically connected with the test signal end VTsw, and the temperature sensing device 12 is a thermistor;

S301, illuminating a sub-pixel 02;

S302, in a lighting state, when the light-emitting element 04 is damaged to generate heat, the thermistor senses that the temperature is increased and the resistance is reduced;

S303, a test signal provided by a test signal end VTsw is input into the control end of the control module 13 through the thermistor, and the control end of the control module 13 is conducted in response to the test signal;

and S304, current flows to the second power supply voltage end through the control module 13, so that the light-emitting element 04 is short-circuited and extinguished, and the damaged position of the light-emitting element 04 is confirmed.

It can be understood that the first end of the control module 13 is electrically connected to the anode of the light emitting element 04, the second end of the control module 13 is electrically connected to the cathode of the light emitting element 04, that is, the control module 13 is connected in parallel to the light emitting element 04, the control module 13 corresponds to a switch, when the control module 13 is turned on, the current flowing from the first power voltage signal end PVDD flows to the second power voltage signal end PVEE through the control module 13 to short-circuit the light emitting element 04 and turn off, and when the control module 13 is turned off, the current flowing from the first power voltage signal end PVDD flows to the second power voltage signal end PVEE through the light emitting element 04, and the light emitting element 04 emits light. In order to effectively detect whether the light emitting element 04 is damaged, a temperature sensing device 12 is arranged between a control end of the control module 13 and the test signal end VTsw, when the light emitting element 04 is heated seriously during lighting, the temperature sensing device 12 senses that the temperature rises and the self resistance value is reduced, so that a test signal provided by the test signal end VTsw can be transmitted to the control end of the control module 13, the control module 13 responds to the test signal to conduct and short-circuit the light emitting element 04, if the light emitting element 04 does not generate heat seriously during lighting, the temperature sensing device 12 has a very large self resistance value to block the test signal of the test signal end VTsw from being transmitted to the control end of the control module 13, and the control module 13 is turned on or off through the temperature sensing device 12 to detect the damaged light emitting element 04, so that the light emitting element 04 darkened due to threshold voltage drift is prevented from being judged to be damaged, consumables are reduced, and cost is saved.

In some alternative embodiments, with continued reference to fig. 14, 15 and 21, fig. 21 is a flowchart of still another embodiment of the present invention, and based on the same concept of the above embodiments, the present embodiment provides a method for detecting a display panel, where the display panel 100 includes a display area DA and a non-display area NDA at least partially surrounding the display area DA;

The display area DA includes:

A pixel 01 comprising at least one sub-pixel 02 and at least one detection unit 03, the sub-pixel 02 comprising a light emitting element 04, the detection unit 03 being a temperature sensor;

The driving chip 18 is positioned in the non-display area NDA, and the detection unit 03 is electrically connected with the driving chip 18;

S401, illuminating a sub-pixel 02, wherein in the illuminating state, the light-emitting element 04 is damaged to generate heat;

S402, sensing temperature by a temperature sensor and feeding back the temperature to the driving chip 18;

s403 the driving chip 18 reduces the voltage of the data signal transmitted to the light emitting element 04, darkens the brightness of the light emitting element 04, and confirms the damaged position of the light emitting element 04.

It can be understood that the temperature sensor is a sensor capable of sensing temperature and converting the temperature into a usable output signal, if the light emitting element 04 is damaged, the light emitting element 04 will generate serious heat when the light emitting element 04 is lighted, the temperature sensor senses the temperature and feeds back the temperature to the driving chip 18 through the signal transmission line 19, the driving chip 18 receives abnormal temperature, reduces the voltage of the data signal, seriously darkens the damaged light emitting element 04, and detects the damaged light emitting element 04.

In some alternative embodiments, referring to fig. 14, a pixel 01 includes at least two sub-pixels 02 and one detecting unit 03, the sub-pixels 02 are arranged in an array, the sub-pixels 02 are arranged along a first direction to form sub-pixel 02 rows, the sub-pixels 02 are arranged along a second direction to form sub-pixel 02 columns, the first direction intersects the second direction, data lines are disposed corresponding to the sub-pixel 02 columns, and the data lines are electrically connected to all sub-pixels 02 of the corresponding sub-pixel 02 columns;

a control module 13, located in the non-display area NDA, for controlling the data lines to transmit data signals to the corresponding sub-pixels 02;

The sub-pixel 02 is turned on, in a turned-on state, the light emitting element 04 is damaged to generate heat, a temperature sensor senses temperature and feeds back to the driving chip 18, the driving chip 18 reduces a voltage of a data signal transmitted to the light emitting element 04, the brightness of the light emitting element 04 is darkened, and a damaged position of the light emitting element 04 is confirmed, including:

the sub-pixels 02 in the same pixel 01 are sequentially turned on by time-sharing data signals to the data lines by the control module 13, and the detecting units 03 detect whether the light emitting elements 04 in the columns of the sub-pixels 02 are damaged, respectively.

It can be understood that when one pixel 01 includes at least two sub-pixels 02 and one detection unit 03, the at least two sub-pixels 02 share the one detection unit 03, so that the at least two sub-pixels 02 need to be lightened in a time-sharing manner, the detection units 03 are utilized to detect the sub-pixels 02 respectively, the effect is more accurate, the damaged light-emitting elements 04 are effectively detected, the number of the detection units 03 can be reduced, and the manufacturing, typesetting and cost reduction are facilitated.

In some alternative embodiments, please refer to fig. 22, fig. 22 is a schematic plan view of a display device 300 according to an embodiment of the present invention, and the display device 300 according to the present embodiment includes the display panel 100 according to the above embodiment of the present invention. The embodiment of fig. 22 is only an example of a mobile phone, and the display device 300 is described, but it is understood that the display device 300 provided in the embodiment of the present invention may be any other display device 300 having a display function, such as a computer, a television, and a vehicle-mounted display device 300, which is not particularly limited in this respect. The display device 300 provided in the embodiment of the present invention has the beneficial effects of the display panel 100 provided in the embodiment of the present invention, and the specific description of the display panel 100 in the above embodiments may be referred to in the embodiments, and the description of the embodiment is omitted herein.

According to the embodiment, the display panel provided by the invention has at least the following beneficial effects:

While certain specific embodiments of the invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A display panel is characterized by comprising a display area and a non-display area at least partially surrounding the display area;

The display area includes:

A pixel including at least one sub-pixel and at least one detection unit;

The sub-pixel includes a pixel driving circuit including:

The detection unit is connected with the light-emitting element in parallel;

the detection unit is used for sensing temperature when the light-emitting element is damaged to generate heat in a state of lighting the sub-pixel so as to judge whether the light-emitting element is damaged, and control current flows through the detection unit to the second power supply voltage signal end to enable the light-emitting element to be short-circuited and extinguished, so that the damage position of the light-emitting element is confirmed.

2. The display panel of claim 1, wherein the detection unit comprises a temperature sensing device and a control module;

The first end of the control module is electrically connected with the anode of the light-emitting element, the second end of the control module is electrically connected with the temperature sensing device, and the control end of the control module is electrically connected with the test signal end;

one end of the temperature sensing device is electrically connected with the second end of the control module, and the other end of the temperature sensing device is electrically connected with the cathode of the light emitting element.

3. The display panel of claim 2, wherein the control module comprises a first transistor, a first pole of the first transistor is electrically connected to the anode of the light emitting element, a second pole of the first transistor is electrically connected to the temperature sensing device, and a gate of the first transistor is electrically connected to the test signal terminal.

4. A display panel according to claim 3, further comprising:

A substrate;

The device layer is positioned on one side of the substrate, the control module is arranged on the device layer, and the temperature sensing device is arranged on one side of the device layer away from the substrate;

An insulating layer located on a side of the device layer away from the substrate;

And the light-emitting layer is positioned on one side of the insulating layer away from the device layer, and the light-emitting element is arranged on the light-emitting layer.

5. The display panel of claim 4, wherein the display panel comprises,

The pixel driving circuit further comprises a second transistor, a first transistor, a second transistor and a second transistor, wherein the second transistor is positioned between the driving module and the light-emitting element, the first electrode of the second transistor is electrically connected with the driving module, the second electrode of the second transistor is electrically connected with the anode of the light-emitting element, and the grid electrode of the second transistor is electrically connected with the light-emitting signal control end;

The gate of the first transistor is co-layered with the gate of the second transistor, the first pole of the first transistor, the second pole of the first transistor, the first pole of the second transistor and the second pole of the second transistor are co-layered, and the semiconductor layer of the first transistor is co-layered with the semiconductor layer of the second transistor.

6. The display panel of claim 4, wherein the temperature sensing device is located between the light emitting layer and the device layer or the temperature sensing device is co-layer with the light emitting layer.

7. The display panel of claim 1, wherein the detection unit comprises a temperature sensing device and a control module;

the first end of the control module is electrically connected with the anode of the light-emitting element, the second end of the control module is electrically connected with the cathode of the light-emitting element, and the control end of the control module is electrically connected with the temperature sensing device;

And one end of the temperature sensing device is electrically connected with the control end of the control module, and the other end of the temperature sensing device is electrically connected with the test signal end.

8. The display panel of claim 7, wherein the control module comprises a first transistor having a first pole electrically connected to the anode of the light emitting element, a second pole electrically connected to the cathode of the light emitting element, and a gate electrically connected to the temperature sensing device.

9. The display panel of claim 8, further comprising:

A substrate;

The device layer is positioned on one side of the substrate and is provided with the control module;

The light-emitting layer is positioned on one side, far away from the device layer, of the insulating layer, the light-emitting element is arranged on the light-emitting layer, and the temperature sensing device is positioned between the substrate and the light-emitting layer.

10. The display panel of claim 9, wherein the display panel comprises,

The pixel driving circuit further comprises a second transistor, a first electrode and a second electrode, wherein the second transistor is positioned between the driving module and the light-emitting element, the first electrode of the second transistor is electrically connected with the driving module, the second electrode of the second transistor is electrically connected with the anode of the light-emitting element, and the grid electrode of the second transistor is electrically connected with the light-emitting signal control end;

The second transistor is positioned on the device layer, the grid electrode of the first transistor is in the same layer with the grid electrode of the second transistor, the first electrode of the first transistor, the second electrode of the first transistor, the first electrode of the second transistor and the second electrode of the second transistor are in the same layer, and the semiconductor layer of the first transistor is in the same layer with the semiconductor layer of the second transistor.

11. The display panel according to claim 10, wherein the temperature sensing device is located between the light emitting layer and the gate of the first transistor or between the gate of the first transistor and the substrate.

12. The display panel according to claim 2 or 7, wherein the temperature sensing device is a thermistor.

13. The display panel of claim 1, wherein the display panel comprises,

The detection unit is a temperature sensor;

The driving chip is positioned in the non-display area;

And one end of the signal transmission line is electrically connected with the driving chip, and the other end of the signal transmission line is electrically connected with the detection unit.

14. The display panel of claim 13, wherein the pixel comprises at least two of the sub-pixels and one of the detection units.

15. A method for detecting a display panel, the display panel comprising:

the detection unit is connected with the light-emitting element in parallel;

16. The method of claim 15, wherein the detection unit includes a temperature sensing device and a control module;

One end of the temperature sensing device is electrically connected with the second end of the control module, the other end of the temperature sensing device is electrically connected with the cathode of the light emitting element, and the temperature sensing device is a thermistor;

And when the light-emitting element is damaged to generate heat in the lighting state, the control end of the control module is conducted in response to a test signal provided by the test signal end, the thermistor senses that the temperature is increased and the resistance is reduced, and current flows to the second power supply voltage end through the control module and the thermistor, so that the light-emitting element is short-circuited to be extinguished, and the damage position of the light-emitting element is confirmed.

17. The method of claim 15, wherein the detection unit includes a temperature sensing device and a control module;

One end of the temperature sensing device is electrically connected with the control end of the control module, the other end of the temperature sensing device is electrically connected with the test signal end, and the temperature sensing device is a thermistor;

And when the light-emitting element is damaged to generate heat in a lighting state, the thermistor senses that the temperature is increased and the resistance is reduced, a test signal provided by the test signal end is input into the control end of the control module through the thermistor, the control end of the control module is conducted in response to the test signal, and current flows to the second power supply voltage end through the control module, so that the light-emitting element is short-circuited to be extinguished, and the damage position of the light-emitting element is confirmed.

18. A detection method of a display panel is characterized in that the display panel comprises a display area and a non-display area at least partially surrounding the display area;

The display area includes:

19. The method according to claim 18, wherein the pixel includes at least two sub-pixels and one of the detecting units, the sub-pixels are arranged in an array, the sub-pixels are arranged in a first direction to form a sub-pixel row, the sub-pixels are arranged in a second direction to form a sub-pixel column, the first direction intersects the second direction, and a data line is provided corresponding to the sub-pixel column, the data line is electrically connected to all the sub-pixels of the corresponding sub-pixel column;

the control module is positioned in the non-display area and used for controlling the data lines to transmit data signals to the corresponding sub-pixels;

The lighting the sub-pixel, in the lighting state, the damage of the light emitting element causes heating, the temperature sensor senses the temperature feedback to the driving chip, the driving chip reduces the voltage of the data signal transmitted to the light emitting element, darkens the brightness of the light emitting element, confirms the damage position of the light emitting element, and the method comprises the following steps:

And the control module is used for transmitting the data signals to the data lines in a time-sharing way, the sub-pixels in the same pixel are sequentially lightened, and the detection units are used for respectively detecting whether the light-emitting elements in the sub-pixel columns are damaged or not.

20. A display device comprising the display panel of any one of claims 1-14.