Display panel and detection method thereof, and display device

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

Technical Field

[0001] The present invention relates to the field of display technology, and more specifically, to a display panel and a detection method thereof, and a display device. Background Art

[0002] A light emitting diode (LED) is a semiconductor diode that can convert electrical energy into light energy. A micro light emitting diode (Micro LED) is a light emitting diode with a size of less than 100 microns. It has the characteristics of small size, high brightness, low energy consumption, and independent control of light emission. It is widely used in display screens, lighting and other fields.

[0003] Usually, after the micro LEDs are manufactured, they need to be transferred to the array substrate through a mass transfer process to form Micro LED display panels of different sizes. During the mass transfer process, due to deviations such as pressure and alignment, some micro LEDs are easily damaged, affecting the display effect of the display panel.

[0004] Therefore, detecting whether the bound micro-diodes are damaged is a technical problem that needs to be solved urgently. Summary of the invention

[0005] In view of this, the present invention provides a display panel and a detection method thereof, and a display device, which are used to detect whether the light-emitting elements after binding are damaged.

[0006] In one aspect, the present invention provides a display panel, comprising: a display area and a non-display area at least partially surrounding the display area;

[0007] The display area includes:

[0008] A pixel includes at least one sub-pixel and at least one detection unit, wherein the sub-pixel includes a light-emitting element, and the detection unit is used to sense temperature to determine whether the light-emitting element is damaged.

[0009] In another aspect, the present invention provides a method for detecting a display panel, wherein the display panel comprises:

[0010] A sub-pixel, wherein the sub-pixel comprises a pixel driving circuit, and the pixel driving circuit comprises:

[0011] A first power supply voltage signal terminal, used for providing a first power supply voltage;

[0012] A second power supply voltage signal terminal, used for providing a second power supply voltage;

[0013] A driving module and a light emitting element connected in series between the first power supply voltage signal terminal and the second power supply voltage signal terminal;

[0014] The detection unit is connected in parallel with the light emitting element;

[0015] The sub-pixel is lit. In the lit state, when the light-emitting element is damaged and generates heat, the detection unit senses the temperature and controls the current to flow to the second power supply voltage signal terminal through the detection unit, so that the light-emitting element is short-circuited and extinguished, thereby confirming the damaged position of the light-emitting element.

[0016] In another aspect, the present invention further provides a method for detecting a display panel, the display panel comprising: a display area and a non-display area at least partially surrounding the display area;

[0017] The display area includes:

[0018] A pixel, comprising 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;

[0019] A driving chip is located in the non-display area, and the detection unit is electrically connected to the driving chip;

[0020] The sub-pixel is lit. In the lit state, the light-emitting element is damaged and generates heat. The temperature sensor senses the temperature and feeds it back to the driver chip. The driver chip reduces the voltage of the data signal transmitted to the light-emitting element, dimming the brightness of the light-emitting element, and confirming the damaged position of the light-emitting element.

[0021] In yet another aspect, the present invention provides a display device, comprising the above display panel.

[0022] Compared with the prior art, the display panel provided by the present invention achieves at least the following beneficial effects:

[0023] A pixel includes 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 temperature to determine whether the light-emitting element is damaged. When the bound light-emitting element is turned on, if the light-emitting element itself is damaged, or the light-emitting element is damaged due to poor binding, the light-emitting element will cause heat to the light-emitting element. The present application sets a detection unit in the pixel. By sensing the temperature by the detection unit, it can be known whether the light-emitting element is in a heating condition when it is turned on. It can effectively detect whether the light-emitting element is damaged, avoid judging the light-emitting element that is dimmed 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.

[0024] Of course, any product implementing the present invention does not necessarily need to achieve all of the technical effects described above at the same time.

[0025] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0027] Figure 1 It is a structural schematic diagram of a display panel provided by the present invention;

[0028] Figure 2 is another structural schematic diagram of a display panel provided by the present invention;

[0029] Figure 3 It is another structural schematic diagram of a display panel provided by the present invention;

[0030] Figure 4 It is a structural schematic diagram of a pixel driving circuit provided by the present invention;

[0031] Figure 5 is another structural schematic diagram of the pixel driving circuit provided by the present invention;

[0032] Figure 6 It is a layout diagram of a pixel driving circuit provided by the present invention;

[0033] Figure 7 yes Figure 6 A cross-section in the A-A' direction;

[0034] Figure 8 yes Figure 6 Another cross-sectional view along the A-A' direction;

[0035] Fig. 9 is another structural schematic diagram of the pixel driving circuit provided by the present invention;

[0036] Fig.10 is another layout diagram of the pixel driving circuit provided by the present invention;

[0037] Fig.11 yes Fig.10 A cross-section in the B-B' direction;

[0038] Fig.12 It is another layout diagram of the pixel driving circuit provided by the present invention;

[0039] Fig.13 yes Fig.12Another cross-sectional view in the C-C' direction;

[0040] Fig.14 It is another structural schematic diagram of a display panel provided by the present invention;

[0041] Fig.15 It is another structural schematic diagram of a display panel provided by the present invention;

[0042] Fig.16 is another structural schematic diagram of the pixel driving circuit provided by the present invention;

[0043] Fig.17 It is a timing diagram provided by the present invention;

[0044] Fig.18 It is a flow chart provided by the present invention;

[0045] Fig.19 is another flow chart provided by the present invention;

[0046] Fig. 20 It is another flow chart provided by the present invention;

[0047] Fig.21 It is another flow chart provided by the present invention;

[0048] Fig. 22 It is a structural schematic diagram of the display device provided by the present invention. DETAILED DESCRIPTION

[0049] 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 components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0050] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0051] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0052] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0053] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0054] The present invention provides a display panel and a detection method thereof, and a display device. Embodiments of the display panel and a detection method thereof, and a display device provided by the present invention will be described in detail below.

[0055] Reference Figure 1 and Figure 2 , Figure 1 is a structural schematic diagram of a display panel provided by the present invention, Figure 2 1 is another structural schematic diagram of a display panel provided by the present invention. The display panel 100 in this embodiment includes: a display area DA and a non-display area NDA at least partially surrounding the display area DA;

[0056] The display area DA includes:

[0057] The pixel 01 includes at least one sub-pixel 02 and at least one detection unit 03. The sub-pixel 02 includes a light-emitting element 04. The detection unit 03 is used to sense the temperature to determine whether the light-emitting element 04 is damaged.

[0058] It should be noted that Figure 1 It is only shown that a pixel 01 includes three sub-pixels 02 and a detection unit 03. Figure 2 Only one pixel 01 is shown to include three sub-pixels 02 and three detection units 03. Of course, the number of sub-pixels 02, the number of detection units 03, and the arrangement of sub-pixels 02 in one pixel 01 can be adjusted according to the needs, and this is not limited in this embodiment. Sub-pixel 02 includes a light-emitting area OA and a non-light-emitting area NOA. Light-emitting element 04 is located in light-emitting area OA. Figure 1 and Figure 2 It is only shown that the detection unit 03 is located in the non-luminous area NOA of the sub-pixel 02, but it is not limited to this. The detection unit 03 can also be set in the luminous area OA of the sub-pixel 02, or between two adjacent sub-pixels 02. It can be adjusted according to needs, and this is not limited in this embodiment. Figure 1 and Figure 2 The display panel 100 is only shown as a rectangular display panel 100. Of course, the display panel 100 can also be a rounded rectangular display panel 100 or a special-shaped display panel 100, and there is no specific limitation. The number of pixels 01 in the display panel 100 and the arrangement of the pixels 01 can also be adjusted according to actual needs, and are not limited thereto. The light emitting element 04 can be a micro light emitting diode (Micro LED) or a mini light emitting diode (Mini LED).

[0059] It is understandable that the dimming of the light-emitting element 04 may be caused by the drift of the threshold voltage, or it may be caused by the damage of the light-emitting element 04. The damage of the light-emitting element 04 may be caused by defects in the production of the light-emitting element 04, or it may be caused by deviations during transfer and binding. The damaged light-emitting element 04 will generate severe heat when it is lit. At least one detection unit 03 is set in the pixel 01 to sense the temperature to determine whether the light-emitting element 04 is damaged. The dimmed light-emitting element 04 can be identified, and the damaged light-emitting element 04 can be accurately found and located to facilitate subsequent replacement, which helps to improve the display effect.

[0060] Compared with the prior art, the display panel 100 provided in this embodiment has at least the following beneficial effects:

[0061] Pixel 01 includes at least one sub-pixel 02 and at least one detection unit 03. Sub-pixel 02 includes light-emitting element 04. Detection unit 03 is used to sense temperature to determine whether light-emitting element 04 is damaged. When the bound light-emitting element 04 is turned on, if the light-emitting element 04 itself is damaged, or the light-emitting element 04 is damaged due to poor binding, the light-emitting element 04 will cause heat generation. The present application sets a detection unit 03 in the pixel 01. By sensing the temperature by the detection unit 03, it can be known whether the light-emitting element 04 is in a heating condition when it is turned on. It can effectively detect whether the light-emitting element 04 is damaged, avoid judging the light-emitting element 04 that is dimmed due to threshold voltage drift as damaged, reduce consumables, save costs, accurately locate the position of the damaged light-emitting element 04, facilitate replacement of the damaged light-emitting element 04, and help improve the display effect of the display panel 100.

[0062] In some optional embodiments, referring to Figure 3 and Figure 4 , Figure 3 is another structural schematic diagram of a display panel provided by the present invention, Figure 4 2 is a schematic diagram of a structure of a pixel driving circuit provided by the present invention. The sub-pixel 02 includes a pixel driving circuit 200. The pixel driving circuit 200 includes:

[0063] A first power supply voltage signal terminal PVDD, used for providing a first power supply voltage;

[0064] A second power supply voltage signal terminal PVEE, used for providing a second power supply voltage;

[0065] A driving module 05 and a light emitting element 04 connected in series between a first power supply voltage signal terminal PVDD and a second power supply voltage signal terminal PVEE;

[0066] The detection unit 03 is connected in parallel with the light emitting element 04 .

[0067] It should be noted that in Figure 3 It is only shown that the pixel driving circuit 200 and the detection unit 03 are both located in the non-luminous area NOA of the sub-pixel 02. The orthographic projection of the pixel driving circuit 200 on the light-emitting surface of the display panel 100 and the orthographic projection of the detection unit 03 on the light-emitting surface of the display panel 100 at least partially overlap. Of course, this is not limited to this. The position of the pixel driving circuit 200 and the position of the detection unit 03 can be adjusted according to actual needs. The working stages of the pixel driving circuit 200 include a reset stage T1, a data writing stage T2, and a light-emitting stage T3. Figure 4 The pixel driving circuit 200 is only schematically shown to include a first power supply voltage signal terminal PVDD, a second power supply voltage signal terminal PVEE, a driving module 05, a light-emitting element 04 and a detection unit 03. The driving module 05 is used to generate a light-emitting driving current in the light-emitting stage T3. The driving module 05 includes a driving transistor M0. The detection unit 03 is used to sense the temperature to determine whether the light-emitting element 04 is damaged; the pixel driving circuit 200 also 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-emitting control module 11. The first reset module 06 is used to reset the driving module 05 in the reset stage T1, the second reset module 07 is used to reset the light-emitting element 04 in the reset stage T1, and the capacitor 08 is used to maintain The potential of the control end of the driving module 05, the data writing module 09 is used to write the data signal into the control end of the driving module 05 in the data writing phase T2, the threshold compensation module 10 is used to compensate the control end of the driving module 05, the light emitting control module 11 is used to control the light emitting element 04 to emit light, 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, the third transistor M3 is located between the first power supply voltage signal terminal PVDD and the driving module 05, the first reset module 06, the second reset module 07, the data writing module 09 and the threshold compensation module 10 all include transistors, and in this embodiment, only a specific structure of the pixel driving circuit 200 is illustrated, but it is not limited to this.

[0068] It can be understood that, in the reset stage T1, the driving module 05 is reset to prevent the threshold voltage drift of the driving module 05 from causing the light-emitting element 04 to dim; in the data writing stage T2, the data signal is written into the control end of the driving module 05; in the light-emitting stage T3, the current flows through the first power supply voltage signal end PVDD to the second power supply voltage signal end PVEE, and the light-emitting element 04 is located between the first power supply voltage signal end PVDD and the second power supply voltage signal end PVEE. If the light-emitting element 04 is not damaged, the current can flow through the light-emitting element 04, so that the light-emitting element 04 emits light normally; if the light-emitting element 04 is damaged, the damage A bad light emitting element 04 will generate severe heat when it is lit. The detection unit 03 connected in parallel with the light emitting element 04 senses the temperature. When the detection unit 03 senses a high temperature, optionally, the resistance of the branch where the detection unit 03 is located is reduced, so that the current flowing out of the first power supply voltage signal terminal PVDD flows to the second power supply voltage signal terminal PVEE through the detection unit 03. At this time, the light emitting element 04 is short-circuited and extinguished. The damaged light emitting element 04 can be accurately and quickly found through the extinguishing position of the light emitting element 04, which is convenient for replacement, avoiding the light emitting element 04 that has dimmed due to threshold voltage drift from being judged as damaged, reducing consumables and saving costs.

[0069] In some optional embodiments, referring to Figure 5 , Figure 5 It is another structural schematic diagram of the pixel driving circuit provided by the present invention, wherein the detection unit 03 includes a temperature sensing device 12 and a control module 13;

[0070] A first end of the control module 13 is electrically connected to the anode of the light emitting element 04, a second end of the control module 13 is electrically connected to the temperature sensing device 12, and a control end of the control module 13 is electrically connected to the test signal end VTsw;

[0071] 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 .

[0072] It is understandable that in Figure 5It is only shown that the temperature sensing device 12 is connected 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 it is not limited thereto. The temperature sensing device 12 is set corresponding to the light emitting element 04. When the light emitting element 04 is lit, the temperature sensing device 12 senses the temperature of the light emitting element 04. When the temperature sensed by the temperature sensing device 12 exceeds the preset threshold, the current passes through the branch where the temperature sensing device 12 is located; on the contrary, when the temperature sensed by the temperature sensing device 12 does not exceed the preset threshold, that is, 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 in parallel with the light emitting element 04, which can achieve the effect of short-circuiting the light emitting element 04 when the temperature is high. The control module 13 is set in series with the temperature sensing device 12, which can control the branch where the temperature sensing device 12 is located.

[0073] In some optional embodiments, continue to refer to Figure 5 The control module 13 includes a first transistor M1, a first electrode of the first transistor M1 is electrically connected to the anode of the light emitting element 04, a second electrode 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.

[0074] 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 will sense that the temperature exceeds the preset threshold value, 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, and the current flowing out of the first power supply voltage signal terminal PVDD still flows to the second power supply 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 supply voltage signal terminal PVDD flows to the second power supply voltage signal terminal PVEE through the temperature sensing device 12, so that the light-emitting element 04 is short-circuited and extinguished. Setting the temperature sensing device 12 can accurately and quickly find the damaged light-emitting element 04, and setting the first transistor M1 can control the detection process of the light-emitting element 04.

[0075] In some optional embodiments, referring to Figure 6 and Figure 7 , Figure 6 is a layout diagram of a pixel driving circuit provided by the present invention, Figure 7 yes Figure 6 A cross-sectional view taken along the line AA' in FIG. 1 , the display panel 100 provided in this embodiment further includes:

[0076] Substrate 14;

[0077] The device layer 15 is located on one side of the substrate 14 . The device layer 15 is provided with a control module 13 . The temperature sensing device 12 is arranged on a side of the device layer 15 away from the substrate 14 .

[0078] an insulating layer 16, located on a side of the device layer 15 away from the substrate 14;

[0079] 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 a light emitting element 04 .

[0080] It should be noted that in Figure 7 In the figure, only the temperature sensing device 12 is shown to be located between the device layer 15 and the light-emitting layer 17. Figure 7 The insulating film layer and the insulating layer 16 in the substrate 14 and the device layer 15 are not pattern-filled, but it is not limited to this. The temperature sensing device 12 can also be in the same layer as the light-emitting element 04, or other film layers are included between the device layer 15 and the light-emitting layer 17, and the temperature sensing device 12 is arranged between these film layers. The substrate 14 can be a rigid substrate or a flexible substrate. When the substrate 14 is a rigid substrate, the material of the substrate 14 can be glass, transparent resin, etc.; when the substrate 14 is a flexible substrate, the material of the substrate 14 can be polycarbonate, polyimide, etc. The device layer 15 includes a gate metal layer, a source and drain metal layer, an active layer, and film layers between each conductive film layer. The device layer 15 can be used to control whether the light-emitting element 04 of the light-emitting layer 17 emits light.

[0081] It can be understood that the control module 13 is set on the device layer 15, and the temperature sensing device 12 is set on the side of the device layer 15 away from the substrate 14. The control module 13 and the temperature sensing device 12 are set using the existing film layer, and there is no need to set an additional film layer, which avoids increasing the thickness of the display panel 100 and helps to make the display panel 100 lighter and thinner.

[0082] In some optional embodiments, continue to refer to Figure 5 and Figure 7 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 the anode of the light emitting element 04, and 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;

[0083] The gate of the first transistor M1 is in the same layer as the gate of the second transistor M2, 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 in the same layer, and the semiconductor layer of the first transistor M1 is in the same layer as the semiconductor layer of the second transistor M2.

[0084] It is understandable that in Figure 7 It is only schematically shown that the first transistor M1 and the second transistor M2 are in the same layer. Of course, the first transistor M1 and the second transistor M2 can also be set in different layers, and it is not limited to this. When the gate of the first transistor M1 and the gate of the second transistor M2 are in the same layer, they can be obtained through the same process, which simplifies the process and reduces costs. Similarly, setting 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 in the same layer, and the semiconductor layer of the first transistor M1 and the semiconductor layer of the second transistor M2 in the same layer can also simplify the process and reduce costs. When the same process is used, the thickness of the gate of the first transistor M1 is equal to the thickness of the gate of the second transistor M2, the thickness of the source and drain of the first transistor M1 is equal to the thickness of the source and drain of the second transistor M2, and the thickness of the semiconductor layer of the first transistor M1 is equal to the thickness of the semiconductor layer of the second transistor M2, which is also helpful for the production of the film layer between the gate metal layer, the source and drain metal layer, and the active layer.

[0085] In some optional embodiments, referring to Figure 6 , Figure 7 and Figure 8 , Figure 8 yes Figure 6 In another cross-sectional view taken along line AA′, the temperature sensing device 12 is located between the light-emitting layer 17 and the device layer 15 , or the temperature sensing device 12 and the light-emitting layer 17 are in the same layer.

[0086] Understandably, Figure 7 It is only shown that the temperature sensing device 12 is located between the light-emitting layer 17 and the device layer 15. Of course, if other film layers are included between the light-emitting layer 17 and the device layer 15, the temperature sensing device 12 can also be arranged between these film layers. This embodiment does not make any specific limitation on this. Figure 8 In the figure, only the temperature sensing device 12 and the light emitting layer 17 are shown in the same layer. Figure 8 The insulating film layer and the insulating layer 16 in the substrate 14 and the device layer 15 are not pattern-filled. Specifically, when the temperature sensing device 12 and the light-emitting element 04 are in the same layer, the orthographic projection of the temperature sensing device 12 on the substrate 14 does not overlap with the orthographic projection of the light-emitting element 04 on the substrate 14, and the temperature sensing device 12 is located in the non-luminous 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 orthographic projection of the temperature sensing device 12 on the substrate 14 and the orthographic projection of the light-emitting element 04 on the substrate 14 may at least partially overlap, and the position of the temperature sensing device 12 can be adjusted according to demand. The temperature sensing device 12 is located in the original film layer of the display panel 100. Setting the temperature sensing device 12 will not increase the thickness of the display panel 100, which helps to make the display panel 100 thin and light.

[0087] In some optional embodiments, referring to Fig. 9 , Fig. 9 It is another structural schematic diagram of the pixel driving circuit provided by the present invention, the detection unit 03 includes a temperature sensing device 12 and a control module 13;

[0088] 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, and the control end of the control module 13 is electrically connected to the temperature sensing device 12;

[0089] The temperature sensing device 12 has one end electrically connected to the control end of the control module 13 , and the other end electrically connected to the test signal end VTsw.

[0090] It is understandable that in Fig. 9 Only the temperature sensing device 12 and the control module 13 are shown in series, the first end of the control module 13 is electrically connected to the anode of the light-emitting element 04, and 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 and the light-emitting element 04 are connected in parallel, and the control module 13 is equivalent to a switch. When the control module 13 is turned on, the current flowing out from the first power supply voltage signal terminal PVDD flows to the second power supply voltage signal terminal PVEE through the control module 13, short-circuiting the light-emitting element 04 and extinguishing it; if the control module 13 is disconnected, the current flowing out from the first power supply voltage signal terminal PVDD flows to the second power supply voltage signal terminal 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 the control end of the control module 13 and the test signal end VTsw. When the light-emitting element 04 generates severe heat when it is turned on, the temperature sensing device 12 connects the test signal end VTsw with the control end of the control module 13, so that the test signal of the test signal end VTsw can be transmitted to the control end of the control module 13, thereby turning on the control module 13 and short-circuiting the light-emitting element 04. If the light-emitting element 04 does not generate severe heat when it is turned on, 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. The temperature sensing device 12 controls the module 13 to be turned on or off, so as to detect the damaged light-emitting element 04, avoid judging the light-emitting element 04 that becomes dim due to threshold voltage drift as damaged, reduce consumables and save costs.

[0091] In some optional embodiments, continue to refer to Fig. 9 The control module 13 includes a first transistor M1 , a first electrode of the first transistor M1 is electrically connected to the anode of the light emitting element 04 , a second electrode 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 .

[0092] 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, and 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 be seriously heated. When the temperature sensed by the temperature sensing device 12 corresponding to the light-emitting element 04 exceeds a preset threshold, the gate of the first transistor M1 and the test signal terminal VTsw are turned on, that is, the gate of the first transistor M1 and the test signal terminal VTsw are connected, and the test signal provided by the test signal terminal VTsw can be transmitted to the gate of the first transistor M1. A transistor M1 is turned on in response to a test signal, and short-circuit the light-emitting element 04; if the light-emitting element 04 is normal, the normal light-emitting element 04 will not generate serious heat when it is lit, and the temperature sensing device 12 senses that the temperature does not exceed the preset threshold, blocking the test signal terminal VTsw from transmitting the test signal to the gate of the first transistor M1, that is, the gate of the first transistor M1 and the test signal terminal VTsw are open-circuited, and the temperature sensing device 12 controls the module 13 to be turned on or off to detect the damaged light-emitting element 04. The damaged light-emitting element 04 is short-circuited and extinguished, which makes it easy to find the damaged light-emitting element 04 accurately and quickly.

[0093] In some optional embodiments, referring to Fig.10 and Fig.11 , Fig.10 is another layout diagram of the pixel driving circuit provided by the present invention, Fig.11 yes Fig.10 A cross-sectional view taken along the BB' line, the display panel 100 provided in this embodiment further includes:

[0094] Substrate 14;

[0095] The device layer 15 is located on one side of the substrate 14, and the device layer 15 is provided with a control module 13;

[0096] an insulating layer 16, located on a side of the device layer 15 away from the substrate 14;

[0097] The light emitting layer 17 is located on a 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 . The temperature sensing device 12 is located between the substrate 14 and the light emitting layer 17 .

[0098] It is understandable that in Fig.11 In the figure, only the control module 13 is shown as the first transistor M1. Fig.11The insulating film layer and the insulating layer 16 in the substrate 14 and the device layer 15 are not pattern-filled. The first transistor M1 is a top-gate structure. The temperature sensing device 12 is located between the device layer 15 and the light-emitting layer 17. Of course, optionally, if other film layers are included between the insulating layer 16 and the light-emitting layer 17, the temperature sensing device 12 can also be arranged between these film layers. If the first transistor M1 is a bottom-gate structure, the structure of the temperature sensing device 12 can be adjusted with the position of the gate of the first transistor M1. This embodiment does not make any specific restrictions on this. The control module 13 and the temperature sensing device 12 are arranged by the existing film layer, and there is no need to arrange an additional film layer, which avoids increasing the thickness of the display panel 100 and helps to achieve a thin and light display panel 100.

[0099] In some optional embodiments, continue to refer to Fig. 9 , Fig.10 and Fig.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 the anode of the light emitting element 04, and a gate of the second transistor M2 being electrically connected to the light emitting signal control terminal EMIT;

[0100] 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 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 in the same layer, and the semiconductor layer of the first transistor M1 is in the same layer as the semiconductor layer of the second transistor M2.

[0101] It is understandable that in Fig.11 It is only schematically shown that the first transistor M1 and the second transistor M2 are in the same layer. Of course, the first transistor M1 and the second transistor M2 can also be set in different layers, and it is not limited to this. When the gate of the first transistor M1 and the gate of the second transistor M2 are in the same layer, they can be obtained through the same process, which simplifies the process and reduces costs. Similarly, setting 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 in the same layer, and the semiconductor layer of the first transistor M1 and the semiconductor layer of the second transistor M2 in the same layer can also simplify the process and reduce costs. When the same process is used, the thickness of the gate of the first transistor M1 is equal to the thickness of the gate of the second transistor M2, the thickness of the source and drain of the first transistor M1 is equal to the thickness of the source and drain of the second transistor M2, and the thickness of the semiconductor layer of the first transistor M1 is equal to the thickness of the semiconductor layer of the second transistor M2, which is also helpful for the production of the film layer between the gate metal layer, the source and drain metal layer, and the active layer.

[0102] In some optional embodiments, continue to refer to Fig.10 , Fig.11 , Fig.12 and Fig.13 , Fig.12 is another layout diagram of the pixel driving circuit provided by the present invention. Fig.13 yes Fig.12 In another cross-sectional view taken along the CC′ direction, the temperature sensing device 12 is located between the light emitting layer 17 and the gate of the first transistor M1 , or the temperature sensing device 12 is located between the gate of the first transistor M1 and the substrate 14 .

[0103] It is understandable that in Fig.11 Only the temperature sensing device 12 is shown to be located between the device layer 15 and the light-emitting layer 17. Of course, if the first transistor M1 is a top-gate structure, the temperature sensing device 12 can be located at any position between the light-emitting layer 17 and the gate of the first transistor M1. Fig.13 In the figure, only the first transistor M1 is shown as a bottom-gate structure. Fig.13 The insulating film layer and the insulating layer 16 in the substrate 14 and the device layer 15 are not pattern-filled. A buffer layer 24 is also included between the gate of the first transistor M1 and the substrate 14. A temperature sensing device 12 is provided between the buffer layer 24 and the substrate 14. The temperature sensing device 12 is electrically connected to the gate of the first transistor M1. Of course, if other film layers are included between the gate of the first transistor M1 and the substrate 14, the temperature sensing device 12 can also be provided between these film layers. The position of the temperature sensing device 12 can be adjusted according to actual needs, and the temperature sensing device 12 can even be provided in the same layer as the gate of the first transistor M1. This embodiment does not impose specific restrictions on this. By providing the control module 13 and the temperature sensing device 12 in the existing film layer, there is no need to provide an additional film layer, thereby avoiding increasing the thickness of the display panel 100 and helping to achieve a thin and light display panel 100.

[0104] In some optional embodiments, continue to refer to Figure 6 , Figure 7 , Figure 8 , Fig.10 , Fig.11 and Fig.13 , the temperature sensing device 12 is a thermistor.

[0105] It can be understood that a thermistor is a sensor resistor whose resistance value changes with temperature. Thermistors include positive temperature coefficient thermistors and negative temperature coefficient thermistors. The resistance value of a positive temperature coefficient thermistor increases with the increase of temperature, and the resistance value of a negative temperature coefficient thermistor decreases with the increase of temperature. In this embodiment, the thermistor is preferably a negative temperature coefficient thermistor. When the light-emitting element 04 emits light normally, it will not generate heat seriously, that is, the resistance value of the thermistor will not decrease seriously. The current flows to the second power supply voltage signal terminal PVEE through the light-emitting element 04, and the light-emitting element 04 will not be short-circuited. If the light-emitting element 04 is damaged, the light-emitting element 04 will generate heat seriously when it is lit, and the thermistor senses the temperature rise and the resistance value decreases seriously, so that the current flows to the second power supply voltage signal terminal PVEE through the detection unit 03, and the light-emitting element 04 is short-circuited and extinguished, thereby quickly and accurately finding the damaged light-emitting element 04, facilitating the replacement of the damaged light-emitting element 04, and helping to improve the display effect of the display panel 100.

[0106] In some optional embodiments, referring to Fig.14 and Fig.15 , Fig.14 is another structural schematic diagram of a display panel provided by the present invention, Fig.15 It is another structural schematic diagram of the display panel provided by the present invention, wherein the detection unit 03 is a temperature sensor; the driving chip 18 is located in the non-display area NDA; and the signal transmission line 19 is electrically connected to the driving chip 18 at one end and to the detection unit 03 at the other end.

[0107] It is understandable that in Fig.14 It is only shown that in one pixel 01, the number of temperature sensing devices 12 is less than the number of sub-pixels 02, that is, at least two sub-pixels 02 share one temperature sensing device 12. Fig.15 It is only shown that in one pixel 01, the number of temperature sensing devices 12 is equal to the number of sub-pixels 02, that is, the temperature sensing devices 12 correspond to the sub-pixels 02 one by one. Fig.14 and Fig.15It is only shown that the temperature sensor is located in the non-luminous area NOA of the sub-pixel 02, that is, the light-emitting element 04 can be located between any film layers of the display panel 100 or in the light-emitting layer 17. For example, the temperature sensor is in the same layer as the light-emitting element 04, or is located between the device layer 15 and the light-emitting layer 17, etc., as long as the temperature of the light-emitting element 04 can be accurately sensed. Of course, if the temperature sensor is located between the light-emitting layer 17 and the substrate 14, the orthographic projection of the temperature sensor on the substrate 14 can overlap with the orthographic projection of the light-emitting element 04 on the substrate 14 at least partially. This embodiment does not impose specific restrictions on the position of the temperature sensor. The temperature sensor refers to a sensor that can sense temperature and convert it into a usable output signal. If the light-emitting element 04 is damaged, when the light-emitting element 04 is lit, the light-emitting element 04 will heat up seriously. The temperature sensor senses the temperature and feeds back the temperature to the driver chip 18 through the signal transmission line 19. The driver chip 18 receives the temperature anomaly, reduces the voltage of the data signal, and makes the damaged light-emitting element 04 seriously dim, and detects the damaged light-emitting element 04.

[0108] In some optional embodiments, continue to refer to Fig.14 and Fig.16 , Fig.16 is another structural schematic diagram of the pixel driving circuit 200 provided by the present invention. Fig.17 It is a timing diagram provided by the present invention, where a pixel 01 includes at least two sub-pixels 02 and a detection unit 03 .

[0109] It should be noted that in Fig.14 In the figure, the pixel 01 includes a first sub-pixel 20, a second sub-pixel 21, a third sub-pixel 22 and a detection unit 03. The first sub-pixel 20, the second sub-pixel 21 and the third sub-pixel 22 are arranged in sequence 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, and 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 midline extending along the second direction. If the center of the detection unit 03 is located on the midline, M=N can be made, and the effect of sensing temperature is better. Of course, the position of the detection unit 03 can be adjusted according to the needs. The detection unit 03 can also be located in the first sub-pixel 20, or in the third sub-pixel 22, or between two adjacent sub-pixels 02. This embodiment does not make specific restrictions on this, as long as the detection unit 03 can accurately sense the temperature of each sub-pixel 02 when it is lit.

[0110] It is understandable that in Fig.14It is also schematically shown that the first sub-pixel 20, the second sub-pixel 21 and the third sub-pixel 22 are sequentially arranged along the first direction. In order to allow the first sub-pixel 20, the second sub-pixel 21 and the third sub-pixel 22 to share a detection unit 03, the first sub-pixel 20, the second sub-pixel 21 and the third sub-pixel 22 need to be time-division 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. The signal control line 23 includes a first signal control line CKH1, a second signal control line CKH2 and a third signal control line CKH3. One end of the data line electrically connected to the first sub-pixel 20 is connected to the fourth transistor M4. The first electrode of the fourth transistor M4 is electrically connected to the driving chip 18, the second electrode of the fourth transistor M4 is electrically connected to the driving chip 18, and 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 electrode of the fifth transistor M5, the second electrode of the fifth transistor M5 is electrically connected to the driving chip 18, and 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 electrode of the sixth transistor M6, the second electrode of the sixth transistor M6 is electrically connected to the driving chip 18, and the gate of the sixth transistor M6 is electrically connected to the third signal control line CKH3; Fig.16The pixel driving circuit 200 is only schematically shown to include a first power supply voltage signal terminal PVDD, a second power supply 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, a threshold compensation module 10 and a light-emitting control module 11. The driving module 05 is used to generate a light-emitting driving current in the light-emitting stage T3, the detection unit 03 is used to sense the temperature to determine whether the light-emitting element 04 is damaged, the first reset module 06 is used to reset the driving module 05 in the reset stage T1, and the second reset module 07 is used to reset 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 both electrically connected to the first scanning line S1, one end of the first reset module 06 is electrically connected to the first reset signal terminal Vref1, and the other end is electrically connected to the driving module 05, one end of the second reset module 07 is electrically connected to the second reset signal terminal Vref2, and the other end is electrically connected to the driving module 05. One end is electrically connected to the anode of the light-emitting element 04, the capacitor 08 is used to maintain the potential of the control end of the driving module 05, the data writing module 09 is used to write the data signal to 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 scanning line S2, one end of the data writing module 09 is electrically connected to the driving module 05, and the other end is electrically connected to the data line, the threshold compensation module 10 is used to compensate the control end of the driving module 05, the light control module 11 is used to control the light emission of the light-emitting element 04, the control end of the light control module 11 is electrically connected to the light signal end, the light 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 supply 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 it is not limited to this. The working phases of the pixel driving circuit 200 include a reset phase T1, a data writing phase T2 and a light emitting phase T3. In the reset phase T1, the first scanning line S1 transmits a first scanning signal, and the control end of the first reset module 06 is turned on in response to the first scanning signal, so that the first reset signal provided by the first reset signal end Vref1 is transmitted to the driving module 05, and the driving module 05 is reset; the control end of the second reset module 07 is turned on in response to the first scanning signal, so that the second reset signal is transmitted to the anode of the light emitting element 04, and the anode of the light emitting element 04 is reset. In the data writing phase T2, the second scanning line S2 provides a second scanning signal, and the control end of the data writing module 09 is turned on in response to the second scanning signal, so that the data transmitted by the data line is written to the control end of the driving module 05. Fig.17, taking a 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 terminal to conduct between the first power supply voltage signal terminal PVDD and the second power supply voltage signal terminal PVEE. At this time, the first signal control line CKH1, the second signal control line CKH2 and the third signal control line CKH3 provide control signals in sequence to turn on the fourth transistor M4, the fifth transistor M5 and the sixth transistor M6 in sequence, that is, the data line electrically connected to the first sub-pixel 20 transmits the data signal first, and the data line electrically connected to the second sub-pixel 21 transmits the data signal then, and finally, the data line electrically connected to the third sub-pixel 22 transmits the data signal, so that the first sub-pixel 20, the second sub-pixel 21 and the third sub-pixel 22 are driven in time-sharing manner, and the detection unit 03 respectively determines whether the first sub-pixel 20, the second sub-pixel 21 and the third sub-pixel 22 are damaged. In this embodiment, only one arrangement of sub-pixels 02 and its time-sharing driving method are provided, but it is not limited to this.

[0111] In some optional embodiments, continue to refer to Figure 1 , Figure 4 and Fig.18 , Fig.18 1 is a flow chart provided by the present invention. Based on the same idea of ​​the above embodiments, this embodiment provides a method for detecting a display panel. The display panel 100 includes:

[0112] Sub-pixel 02, sub-pixel 02 includes a pixel driving circuit 200, and the pixel driving circuit 200 includes:

[0113] A first power supply voltage signal terminal PVDD, used for providing a first power supply voltage;

[0114] A second power supply voltage signal terminal PVEE, used for providing a second power supply voltage;

[0115] A driving module 05 and a light emitting element 04 connected in series between a first power supply voltage signal terminal PVDD and a second power supply voltage signal terminal PVEE;

[0116] The detection unit 03 is connected in parallel with the light emitting element 04;

[0117] S101: Light up sub-pixel 02;

[0118] S102: In the lit state, when the light emitting element 04 is damaged and generates heat, the detection unit 03 senses the temperature and controls the current to flow to the second power supply voltage signal terminal PVEE through the detection unit 03, so that the light emitting element 04 is short-circuited and extinguished, thereby confirming the damaged position of the light emitting element 04.

[0119] It can be understood that the damaged light-emitting element 04 includes: the light-emitting element 04 that has defects during production and the light-emitting element 04 that is damaged during transfer and binding. Only the damaged light-emitting element 04 not only dims in brightness but also generates severe heat when lit. The damaged light-emitting element 04 is short-circuited by sensing the temperature through the detection unit 03, causing the damaged light-emitting element 04 to be extinguished. The damaged light-emitting element 04 can be found accurately and quickly, which is convenient for replacement. It can also avoid judging the light-emitting element 04 that has dimmed due to threshold voltage drift as damaged, thereby reducing consumables and saving costs.

[0120] In some optional embodiments, continue to refer to Figure 5 and Fig.19 , Fig.19 It is another flow chart provided by the present invention, the detection unit 03 includes a temperature sensing device 12 and a control module 13;

[0121] A first end of the control module 13 is electrically connected to the anode of the light emitting element 04, a second end of the control module 13 is electrically connected to the temperature sensing device 12, and a control end of the control module 13 is electrically connected to the test signal end VTsw;

[0122] 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. The temperature sensing device 12 is a thermistor;

[0123] S201: Light up sub-pixel 02;

[0124] S202: In the lighting state, when the light emitting element 04 is damaged and generates heat, the control terminal of the control module 13 is turned on in response to the test signal provided by the test signal terminal VTsw;

[0125] S203: The thermistor senses the temperature rise and the resistance value decreases, and the current flows through the control module 13 and the thermistor to the second power supply voltage terminal, so that the light emitting element 04 is short-circuited and extinguished, and the damaged position of the light emitting element 04 is confirmed.

[0126] It is understandable that directly connecting the temperature sensing device 12 in parallel with the light emitting element 04 can achieve the effect of short-circuiting the light emitting element 04 when the temperature is high, but the detection process cannot be controlled. The control end of the control module 13 is electrically connected to the test signal end VTsw. When the test signal end VTsw provides a test signal, the control module 13 responds to the test signal and is turned on. The control module 13 is set in series with the temperature sensing device 12. The opening of the control module 13 is controlled by the test signal, so that the branch where the temperature sensing device 12 is located can be controlled. During the detection process, the test signal end VTsw provides a test signal to turn on the control module 13, and the thermistor senses the temperature of the light-emitting element 04. If the light-emitting element 04 is damaged, when it is lit, the temperature of the light-emitting element 04 continues to rise. The thermistor corresponding to the light-emitting element 04 senses that the temperature continues to rise while the resistance value continues to decrease. The current can flow through the thermistor to the second power supply voltage signal end PVEE, that is, the current flowing out from the first power supply voltage signal end PVDD flows to the second power supply voltage signal end PVEE through the detection unit 03, short-circuiting the light-emitting element 04, so that the light-emitting element 04 is extinguished. Through the extinguishing position of the light-emitting element 04, the damaged light-emitting element 04 can be found quickly and accurately.

[0127] In some optional embodiments, referring to Fig. 9 and Fig. 20 , Fig. 20 It is another flow chart provided by the present invention, the detection unit 03 includes a temperature sensing device 12 and a control module 13;

[0128] 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, and the control end of the control module 13 is electrically connected to the temperature sensing device 12;

[0129] A temperature sensing device 12, one end of which is electrically connected to the control end of the control module 13, and the other end of which is electrically connected to the test signal end VTsw, and the temperature sensing device 12 is a thermistor;

[0130] S301: Light up sub-pixel 02;

[0131] S302: In the lighting state, when the light-emitting element 04 is damaged and generates heat, the thermistor senses the temperature rise and the resistance value decreases;

[0132] S303: The test signal provided by the test signal terminal VTsw is input to the control terminal of the control module 13 via the thermistor, and the control terminal of the control module 13 is turned on in response to the test signal;

[0133] S304: The current flows to the second power supply voltage terminal 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.

[0134] 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, and 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 with the light-emitting element 04, and the control module 13 is equivalent to a switch. When the control module 13 is turned on, the current flowing out from the first power supply voltage signal terminal PVDD flows to the second power supply voltage signal terminal PVEE through the control module 13, short-circuiting the light-emitting element 04 and extinguishing it; if the control module 13 is disconnected, the current flowing out from the first power supply voltage signal terminal PVDD flows to the second power supply voltage signal terminal 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 the control end of the control module 13 and the test signal end VTsw. When the light-emitting element 04 generates severe heat when it is lit, the temperature sensing device 12 senses the temperature increase and its own resistance value decreases, so that the 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 is turned on in response to the test signal, and the light-emitting element 04 is short-circuited. If the light-emitting element 04 does not generate severe heat when it is lit, the temperature sensing device 12 itself has a large resistance value and blocks the test signal of the test signal end VTsw from being transmitted to the control end of the control module 13. The temperature sensing device 12 controls the module 13 to be turned on or off, so as to detect the damaged light-emitting element 04, avoid judging the light-emitting element 04 that has dimmed due to threshold voltage drift as damaged, reduce consumables and save costs.

[0135] In some optional embodiments, continue to refer to Fig.14 , Fig.15 and Fig.21 , Fig.21 It is another flow chart provided by the present invention. Based on the same idea of ​​the above embodiments, this embodiment provides a method for detecting a display panel. The display panel 100 includes: a display area DA and a non-display area NDA at least partially surrounding the display area DA;

[0136] The display area DA includes:

[0137] Pixel 01, including at least one sub-pixel 02 and at least one detection unit 03, sub-pixel 02 includes light-emitting element 04, and detection unit 03 is a temperature sensor;

[0138] The driving chip 18 is located in the non-display area NDA, and the detection unit 03 is electrically connected to the driving chip 18;

[0139] S401: Light up the sub-pixel 02. In the light-up state, the light-emitting element 04 is damaged and generates heat;

[0140] S402: The temperature sensor senses the temperature and feeds it back to the driver chip 18;

[0141] S403 : The driving chip 18 reduces the voltage of the data signal transmitted to the light emitting element 04 , so that the brightness of the light emitting element 04 becomes dim, and the damaged position of the light emitting element 04 is confirmed.

[0142] It can be understood that the temperature sensor refers to a sensor that can sense temperature and convert it into a usable output signal. If the light-emitting element 04 is damaged, the light-emitting element 04 will generate severe heat when the light-emitting element 04 is turned on. The temperature sensor senses the temperature and feeds back the temperature to the driver chip 18 through the signal transmission line 19. The driver chip 18 receives the temperature anomaly, reduces the voltage of the data signal, causes the damaged light-emitting element 04 to become severely dim, and detects the damaged light-emitting element 04.

[0143] In some optional embodiments, referring to Fig.14 , the pixel 01 includes at least two sub-pixels 02 and a detection unit 03, the sub-pixels 02 are arranged in an array, the sub-pixels 02 are arranged along a first direction to form a sub-pixel 02 row, the sub-pixels 02 are arranged along a second direction to form a sub-pixel 02 column, the first direction intersects the second direction, and the data line is arranged corresponding to the sub-pixel 02 column, and the data line is electrically connected to all the sub-pixels 02 in the corresponding sub-pixel 02 column;

[0144] The control module 13 is located in the non-display area NDA and is used to control the data line to transmit the data signal to the corresponding sub-pixel 02;

[0145] Light up the sub-pixel 02. In the light-up state, the light-emitting element 04 is damaged and generates heat. The temperature sensor senses the temperature and feeds it back to the driver chip 18. The driver chip 18 reduces the voltage of the data signal transmitted to the light-emitting element 04, dimming the brightness of the light-emitting element 04. The damaged position of the light-emitting element 04 is confirmed, including:

[0146] The control module 13 transmits data signals to the data line in a time-sharing manner, and the sub-pixels 02 in the same pixel 01 are lit up in sequence, and the detection unit 03 detects whether the light-emitting elements 04 in the sub-pixel 02 column are damaged.

[0147] It can be understood that when a pixel 01 includes at least two sub-pixels 02 and a detection unit 03, at least two sub-pixels 02 share one detection unit 03, and at least two sub-pixels 02 need to be lit up in a time-sharing manner. The sub-pixels 02 are detected separately using the detection unit 03, which is more accurate and can effectively detect damaged light-emitting elements 04. It can also reduce the number of detection units 03, facilitate production and typesetting, and reduce costs.

[0148] In some alternative embodiments, please refer to Fig. 22 , Fig. 223 is a schematic diagram of a planar structure of a display device 300 provided in an embodiment of the present invention. The display device 300 provided in this embodiment includes the display panel 100 provided in the above embodiment of the present invention. Fig. 22 The embodiment only takes a mobile phone as an example to illustrate the display device 300. It can be understood that the display device 300 provided in the embodiment of the present invention can be a computer, a television, a car display device 300 or other display devices 300 with display functions, and the present invention does not specifically limit this. 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. For details, please refer to the specific description of the display panel 100 in the above embodiments, and this embodiment will not be repeated here.

[0149] It can be seen from the above embodiments that the display panel provided by the present invention achieves at least the following beneficial effects:

[0150] A pixel includes 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 temperature to determine whether the light-emitting element is damaged. When the bound light-emitting element is turned on, if the light-emitting element itself is damaged, or the light-emitting element is damaged due to poor binding, the light-emitting element will cause heat to the light-emitting element. The present application sets a detection unit in the pixel. By sensing the temperature by the detection unit, it can be known whether the light-emitting element is in a heating condition when it is turned on. It can effectively detect whether the light-emitting element is damaged, avoid judging the light-emitting element that is dimmed 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.

[0151] Although some specific embodiments of the present 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 present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A display panel, characterized in that: include: a display area and a non-display area at least partially surrounding the display area; The display area includes: A pixel comprising at least one sub-pixel and at least one detection unit; The sub-pixel includes a pixel driving circuit, and the pixel driving circuit includes: A first power supply voltage signal terminal, used for providing a first power supply voltage; A second power supply voltage signal terminal, used for providing a second power supply voltage; A driving module and a light emitting element connected in series between the first power supply voltage signal terminal and the second power supply voltage signal terminal; The detection unit is connected in parallel with the light emitting element; The detection unit is used to sense the temperature when the light-emitting element is damaged and generates heat when the sub-pixel is lit, so as to determine whether the light-emitting element is damaged, control the current to flow to the second power supply voltage signal terminal through the detection unit, so that the light-emitting element is short-circuited and extinguished, and confirm the damaged position of the light-emitting element.

2. The display panel according to claim 1, characterized in that: The detection unit includes a temperature sensing device and a control module; The first end of the control module is electrically connected to the anode of the light emitting element, the second end of the control module is electrically connected to the temperature sensing device, and the control end of the control module is electrically connected to the test signal end; One end of the temperature sensing device is electrically connected to the second end of the control module, and the other end of the temperature sensing device is electrically connected to the cathode of the light emitting element.

3. The display panel according to claim 2, characterized in that: The control module includes a first transistor, a first electrode of the first transistor is electrically connected to the anode of the light-emitting element, a second electrode 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. The display panel according to claim 3, characterized in that: Also includes: substrate; A device layer, located on one side of the substrate, the device layer is provided with the control module, and the temperature sensing device is arranged on a side of the device layer away from the substrate; an insulating layer, located on a side of the device layer away from the substrate; The light-emitting layer is located on a side of the insulating layer away from the device layer, and the light-emitting element is provided on the light-emitting layer.

5. The display panel according to claim 4, characterized in that: The pixel driving circuit further includes: a second transistor located between the driving module and the light emitting element, wherein a first electrode of the second transistor is electrically connected to the driving module, a second electrode of the second transistor is electrically connected to an anode of the light emitting element, and a gate of the second transistor is electrically connected to a light emitting signal control terminal; the second transistor is located in the device layer; The gate of the first transistor is in the same layer as the gate 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 as the semiconductor layer of the second transistor.

6. The display panel according to claim 4, characterized in that: The temperature sensing device is located between the light emitting layer and the device layer, or the temperature sensing device is in the same layer as the light emitting layer.

7. The display panel according to claim 1, characterized in that: The detection unit includes a temperature sensing device and a control module; The first end of the control module is electrically connected to the anode of the light emitting element, the second end of the control module is electrically connected to the cathode of the light emitting element, and the control end of the control module is electrically connected to the temperature sensing device; The temperature sensing device has one end electrically connected to the control end of the control module and the other end electrically connected to the test signal end.

8. The display panel according to claim 7, characterized in that: The control module includes a first transistor, a first electrode of the first transistor is electrically connected to the anode of the light-emitting element, a second electrode of the first transistor is electrically connected to the cathode of the light-emitting element, and a gate of the first transistor is electrically connected to the temperature sensing device.

9. The display panel according to claim 8, characterized in that: Also includes: substrate; A device layer, located at one side of the substrate, wherein the control module is provided on the device layer; an insulating layer, located on a side of the device layer away from the substrate; The light-emitting layer is located on a side of the insulating layer away from the device layer. The light-emitting element is provided on the light-emitting layer. The temperature sensing device is located between the substrate and the light-emitting layer.

10. The display panel according to claim 9, characterized in that: The pixel driving circuit further includes: a second transistor located between the driving module and the light emitting element, wherein a first electrode of the second transistor is electrically connected to the driving module, a second electrode of the second transistor is electrically connected to an anode of the light emitting element, and a gate of the second transistor is electrically connected to a light emitting signal control terminal; The second transistor is located in the device layer; the gate of the first transistor is in the same layer as the gate 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 as the semiconductor layer of the second transistor.

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

12. The display panel according to claim 2 or 7, characterized in that: The temperature sensing device is a thermistor.

13. The display panel according to claim 1, characterized in that: The detection unit is a temperature sensor; A driving chip, located in the non-display area; A signal transmission line has one end electrically connected to the driving chip and the other end electrically connected to the detection unit.

14. The display panel according to claim 13, characterized in that: The pixel includes at least two sub-pixels and one detection unit.

15. A method for detecting a display panel, characterized in that: The display panel comprises: A sub-pixel, wherein the sub-pixel comprises a pixel driving circuit, and the pixel driving circuit comprises: A first power supply voltage signal terminal, used for providing a first power supply voltage; A second power supply voltage signal terminal, used for providing a second power supply voltage; A driving module and a light emitting element connected in series between the first power supply voltage signal terminal and the second power supply voltage signal terminal; The detection unit is connected in parallel with the light emitting element; The sub-pixel is lit. In the lit state, when the light-emitting element is damaged and generates heat, the detection unit senses the temperature and controls the current to flow to the second power supply voltage signal terminal through the detection unit, so that the light-emitting element is short-circuited and extinguished, thereby confirming the damaged position of the light-emitting element.

16. The display panel detection method according to claim 15, characterized in that: The detection unit includes a temperature sensing device and a control module; The first end of the control module is electrically connected to the anode of the light emitting element, the second end of the control module is electrically connected to the temperature sensing device, and the control end of the control module is electrically connected to the test signal end; One end of the temperature sensing device is electrically connected to the second end of the control module, and the other end is electrically connected to the cathode of the light emitting element, and the temperature sensing device is a thermistor; The sub-pixel is lit. In the lit state, when the light-emitting element is damaged and generates heat, the control end of the control module responds to the test signal provided by the test signal end and is turned on, the thermistor senses the temperature increase and the resistance value decreases, and the current flows through the control module and the thermistor to the second power supply voltage end, so that the light-emitting element is short-circuited and extinguished, and the damaged position of the light-emitting element is confirmed.

17. The display panel detection method according to claim 15, characterized in that: The detection unit includes a temperature sensing device and a control module; The first end of the control module is electrically connected to the anode of the light emitting element, the second end of the control module is electrically connected to the cathode of the light emitting element, and the control end of the control module is electrically connected to the temperature sensing device; The temperature sensing device has one end electrically connected to the control end of the control module and the other end electrically connected to the test signal end, and the temperature sensing device is a thermistor; The sub-pixel is lit. In the lit state, when the light-emitting element is damaged and generates heat, the thermistor senses the temperature increase and the resistance value decreases. The 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 turned on in response to the test signal. The current flows through the control module to the second power supply voltage end, so that the light-emitting element is short-circuited and extinguished, and the damaged position of the light-emitting element is confirmed.

18. A method for detecting a display panel, 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: A pixel, comprising 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; A driving chip is located in the non-display area, and the detection unit is electrically connected to the driving chip; The sub-pixel is lit. In the lit state, the light-emitting element is damaged and generates heat. The temperature sensor senses the temperature and feeds it back to the driver chip. The driver chip reduces the voltage of the data signal transmitted to the light-emitting element, dimming the brightness of the light-emitting element, and confirming the damaged position of the light-emitting element.

19. The display panel detection method according to claim 18, characterized in that: The pixel comprises at least two sub-pixels and one detection unit, the sub-pixels are arranged in an array, the sub-pixels are arranged along a first direction to form a sub-pixel row, the sub-pixels are arranged along a second direction to form a sub-pixel column, the first direction intersects the second direction, and a data line is arranged corresponding to the sub-pixel column, and the data line is electrically connected to all the sub-pixels of the corresponding sub-pixel column; A control module, located in the non-display area, for controlling the data line to transmit a data signal to the corresponding sub-pixel; The sub-pixel is lit, and in the lit state, the light-emitting element is damaged and generates heat, the temperature sensor senses the temperature and feeds it back to the driver chip, the driver chip reduces the voltage of the data signal transmitted to the light-emitting element, dims the brightness of the light-emitting element, and confirms the damaged position of the light-emitting element, including: The control module transmits the data signal to the data line in a time-sharing manner, the sub-pixels in the same pixel are lit up in sequence, and the detection unit detects whether the light-emitting elements in the sub-pixel columns are damaged.

20. A display device, characterized in that: A display panel comprising any one of claims 1-14.

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